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Патент USA US3026396

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. March 20, 1962
H. F. MASON
3,026,586
ROTARY SWITCH
Filed Jan. 25, 1958
3 Sheets-Sheet 1
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March 20, 1962
H. F. MASON
3,026,386
ROTARY SWITCH
Filed Jan. 23, 1958
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3 Sheets-Sheet 2
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36
102
128
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March 20, 1962
H. F. 'MASON
3,026,386
.
ROTARY SWITCH
3 Sheets-Sheet 3
Filed Jan. '23, 1958
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United States Patent 0 Mice
3,026,386
Patented Mar. 20, 1962
1
2
3,026,386
tary actuator and which provides the resilient lost-motion
connection hereinbefore discussed, the rotary actuator also
ROTARY SW [1 CH
being rotatable about the center of curvature of the con
Howard F. Mason, Los Angeles, Calif., assignor to Mason
Electric Corporation, Los Angeles, Calif., a corpora
tion of California
tact path. The roller contact is resiliently biased into
engagement with the contact path and, in the preferred
embodiment of the invention, this is accomplished by re
Filed Jan. 23, 1958, Ser. No. 710,796
28 Claims. (Cl. 200-68)
The present invention relates in general to electric
silient means acting between the rotor and a contact
carrier which is movable relative to the rotor in a direc
tion toward and away from the center of curvature of
switches and, more particularly, to a switch which op— 10 the contact path, and thus toward and away from the
contact path itself.
erates with a snap action to provide a fast make and
With the foregoing general background, a primary
break to minimize arcing, which operates in a positive
object of the present invention is to provide a switch
wherein the resilient lost-motion connection includes
manner in the sense that the movable contact snaps from
one operative position to another without any possibility
of hesitating etween such positions, which operates in
this manner irrespective of how the switch is manipulated
manually by the operator, which provides a positive “feel”
' spring means carried by the rotor adjacent the outer
periphery thereof and having arms which extend radially
inwardly toward the center of curvature of the contact
path into engagement with the rotary actuator, such spring
so that the operator can readily tell that the switch has
advanced from one operative position to another, and
so forth.
means comprising at least one torsion spring having a
20 coil carried by the rotor adjacent the outer periphery
More particularly, the invention relates to a switch
which is similar to and achieves the results attainable with
the switches disclosed and claimed in my copending ap
thereof and providing the arms mentioned.
Another object is to provide the rotary actuator and
the rotor with stops respectively engageable with the arms
of each torsion spring in such a manner that the arms
plication Serial No. 325,401, ?led December 11, 1952,
now Patent Number 2,831,082, granted April 15, 1958, 25 are moved relative to each other in a direction to stress
the coil of the torsion spring in response to rotation of
of which the present application is a continuation-in-part,
a general object of the invention being to provide a
switch which is an improvement on those disclosed in said
the rotary actuator relative to the rotor with the roller
contact disposed in a recess in the contact path. With
this construction, energy is stored in the coil of each
torsion spring to cause the roller contact to jump from
Considering the switch of the present invention in a
the recess in which it is disposed into the next recess
general way, it includes a contact path having two or
upon movement of the roller contact out of the recess
more spaced recesses therein which de?ne operative posi
in which it is initially disposed.
tions of a movable contact, the latter being a roller
Another object of the invention is to provide on the
contact adapted to roll along the contact path. More
particularly, the invention contemplates a switch where 35 rotary actuator a kicking means which operates to ro
tate the rotor after limited rotation of the rotary actuator
in the contact path is arcuate and concave, de?ning either
relative thereto so as to kick the roller contact out of the
part of a circle, or a complete circle, and wherein sta
recess in which it is disposed so that the energy stored
tionary contacts are located at at least certain of the
in the coil of each torsion spring may be utilized to carry
recesses in the contact path, such recesses being formed
the roller contact into the next recess. In this connec
in the respective stationary contacts. Thus, the roller
tion, another object is to provide a kicking means on the
contact engages stationary contacts in one or more of
rotary actuator comprising a kicker engageable with that
its operative positions wherein it is received in one of the
arm of each torsion spring which is engageable with a
recesses, the contact path being formed of electrically in
stop on the rotor so that such kicker forces the spring
sulating material between the stationary contacts.
The switch of the invention further includes an actuat 45 arm in question against the stop on the rotor to force
the rotor to rotate after limited rotation of the rotary
ing means for moving the roller contact along the con
actuator relative thereto, thereby forcing the roller con
tact path, and into and out of each of the recesses therein,
tact out of the recess in which it is disposed.
which includes a pivotable or rotatable actuator, herein
copending application.
after referred to as a rotary actuator, and a resilient lost
Another object of the invention is to provide spring
means acting between the roller contact carrier and the
motion connection between such actuator and the roller
rotor
for biasing the roller contact into engagement with
contact which'permits the roller contact to remain in the
the contact path, such spring means also comprising at
recess in which it is disposed until the actuator has been
least one torsion spring having an arm engaging the con
rotated through an angle su?‘icient that the energy stored
tact carrier and having an arm which engages the rotor.
in the resilient lost-motion connection causes the rotatable
Another object is to provide a resilient means for bias
contact to jump from the recess in which it is disposed 55 ing the roller contact into engagement with the contact
into the next recess with a snap action. This resilient
path which includes spring means comprising a torsion
lost-motion connection between the rotary actuator and
spring having an arm in engagement with the contact
the roller contact includes kicking means limiting the
carrier and another arm in engagement with the rotary
range of relative angular movement between the rotary
actuator so that rotation of rotary actuator relative to
actuator and the roller contact for positively displacing
the rotor results in the application of an increased spring
or kicking the roller contact out of the recess in which
it is disposed, whereupon the energy stored in the re
silient lost-motion connection carries the roller contact
all the way into the next recess on the contact path
irrespective of how the rotary actuator may be manipu
lated manually, or otherwise, after the roller contact
leaves the recess in which it is initially disposed.
The switch of the invention still further includes a
rotor which carries the roller contact and which is ro~
tatable about the center of curvature of the concave con 70
tact path by the rotary actuator through a rotation trans
mitting means which interconnects the rotor and the ro
force to the roller contact to maintain it in the recess in
which it is disposed until it is kicked out of such recess
at the end of the range of limited movement of the ro
tary actuator relative to the rotor. With this construc
tion, the roller contact is positively held in the recess in
which it is disposed until the kicking means comes into
operation, thereby insuring a positive, controlled jump
to the next recess.
Another object is to provide a switch wherein the
torsion spring or springs for biasing the roller contact
into engagement with the contact path also include coils
3,026,386
8.
4
carried~by the rotor adjacent the outer'periphery thereof.
The foregoing use of torsion springs having radially
the switch components in another set of relative posi
tions;
inwardly extending arms to bias the roller contact into
FIG. 9 is a sectional view taken along the arrowed
engagement with the contact path and to store the energy
line 9-9 of FIG. 7;
required to‘ cause the roller contact to jump from one
FIG. 10 is a sectional view taken along the arrowed
recess ‘for theh'ext‘whén it is forced out of the ?rst recess
line Eli-10 of FIG. 8;
FIG. 11 is a fragmentary perspective view of contact
by thekicking means, results in a very simple and com
pact structure’ and permits a substantial reduction in
biasing and contact jumping means of the invention;
switch'si'ze for a given capacity,'which ‘are important
FIG. 12 is a fragmentary developed view of a contact
features "of the invention.
10 path incorporated in the switch of the invention;
Another object is to provide a switch of the foregoing
FIG. 13 is a perspective view of a contact carrier of
‘nature wherein the stationary contacts are 'oifset laterally
the invention;
FIG. 14 is a perspective view of a. stationary contact
from the portion of the contact path which is formed of
of the invention; and
the electrical insulating material. In other words, the
‘contact path is ‘formed with circumferentially spaced and
circumferen'tialiy aligned segments of electrical‘insulating
material and-the stationary contacts are offset laterally
from such'seg'rnents and disposed opposite the spaces
therebetween. With this construction, the portions of
'the roller contact which engage the stationaryvcontacts
ldornot engage the insulated‘ segments, the insulated seg
ments being engaged by'diil‘erent portions of, the roller
FIG. 15 is a perspective view-of an arc barrier of the
invention.
,
Referring ?rst to’ FIGS. l'to 4 of the drawings, por
trayed therein is a switch 2!} which illustrates the inven
tion semidiagrmmatically to show the fundamental prin
ciples’ thereof more clearly. The switch 20 includes a
structure 22>which provides a contact path 24. having cir
cumferentially spaced recesses‘ 26 and 28 therein,.the con
‘contact. Thus, the roller contact does not track metal
tact path being arcuate and concave and the recesses fac
from the stationary contacts onto the insulated segments,
ing radially inwardly toward the center of curvature 30
thereby avoiding the eventual current leakage between N) Cir of the contact path. At least one of the recesses 26 and
stationary-contacts that such metal tracking would pro
23 is formed in a stationary contact on the'contact path
duce, which is an important feature of the invention.
24, both of the recesses 26 and 28 being formed in station
Still another object of the invention is to. provide
ary contacts 32 and 34, respectively, in the particular con
means for minimizing arcing between the roller contact
structionillustrated. The structure 22 betweenthe sta
and the stationary contacts which comprises making the
tionary contacts 32 and 34 is-formed of electrical insulat
contact; carrier a shell capable of substantially com
ing material.
pletely enclosing the roller-contact on both sides and
Movable along the contact path 24 and receivable in
both, ends, the contact carrier being open only on the
each of-the recesses 26 and ~28 is a roller contact 36 rotat
side thereof which faces the contact path. The shell
ably mounted in, a contact carrier 38 by means of an axle
forming the contact carrier is substantially ‘in engage 35 4%}. The contact carrier 38 is carried by a rotor 42 hav
ment with the contact path when the roller contact is
ing therein a radial slot. 44 which receives a shaft 46 at
disposed in each recess, the clearance between the contact
thecenter of curvature 30 of the contact path 24 to per
_.path and the contact carrier being not more than about
mit movement of'the roller contact 36 into and out of
0.015 vinch. With this construction, any are which may
each of-the-recesses 26‘ and 28. .The contact carrier.v and
exist must pass through a very narrow gap, which gap
is reduced to a very small dimension when the roller cou—
tact is in one'of the recesses in the contact path. Thus,
arcing is minimized as the roller contact'is moving from
"one recess to the other and extinguishing of the arc is
insured when the roller contact drops into the next recess
' due to the substantial engagement of the contact carrier
with the contact path.
Another object with respect to minimizing arcing 'is to
' provide on the rotor arc barriers on opposite sides of
p the roller’contact, such are barriers being-of electrical
insulating materialrand being substantially in sliding en
gagement with the contact path'to provide a highly con
stricted arc chute through which any are must travel,
‘ whereby even moreelfective arc quenching results, which
is an important feature.
‘The foregoing objects, advantages, features and results
of‘ the present invention, together with various other ob
:‘jects, advantages, features and results thereof which will
be evident to those skilled in the switch art in the light
of this disclosure, may be attained with the exemplary
the rotor 42-are biased away from the center of curvature
30 of the contact path 24 by a compression spring 48 act
- ing between the contact carrier 38. and the- shaft 46,
whereby thisspring biases the roller contact into engages
~ ment with’ the contact path.
it will be understood that while the contact carrier 383
is shown as ?xedly mounted on the rotor 42 and the rotor‘
is shown as radially movable toward and away from the
contact path 24,‘ the rotor 42 may. be radially-immovable
and the contact carrier 38 may be. mounted on the rotor
for radial movement relative. thereto toward and away
from the center of curvature 30 of the contact path, the
spring 48 still acting on the contact carrier »38 under such
circumstancesto bias the roller. contact into engagement
with the contact path. Such a'structure is incorporated
55 in the actual embodiment of. the invention illustrated in
- FIGS. 5 to 15- of the. drawings and described in detail
hereinafter.
The switch 20includes a rotary actuator 50 which is
rotatable about the center of curvature 30 of the contact
embodiments of the invention described in detail herein 60 path 24, there being a rotation transmitting means 52
which provides a resilient lost-motion connection between
" after and illustrated in the accompanying drawings, in
the rotor and the rotary actuator for transmitting rota
which:
tion of the rotary’ actuator about the center of curvature
FIGS. 1, 2, 3 and 4 are views respectively illustrating
1 39 to the rotor after limited rotation of the rotary actuator
successive positions of a semidiagrammatic‘representa
65 relative to the rotor. More speci?cally, the ‘rotation
tion of an electric switch of the invention;
~
transmitting’ means 52 comprises two compression springs
FIG. 5 is a longitudinal sectional view of an electric
54 and 56-each'seated at one end againstthe rotor 42 and
switch which embodies the invention;
at its other-end against the rotary actuator 50. Kickers
FIG. 6 is a transverse sectional view taken along the
58 and 60 on the rotary actuator 50 are engageable with
arrowed line 6—6 of FIG. 5;
the rotor 42'tolimit rotation of ‘the rotary actuator rela
FIG. 7 is an enlarged, fragmentary sectional view taken
tive to the rotor to apredetermined range and to displace
along the arrowed line 7——7 of FIG. 5 and illustrating
or kick the roller contact 36 out of the recess 26 or 28 in
the components-of the switch in one set of relative posi
which it is disposed in a positivermanner.
tions;
' FIG. 8 is a view similar to FIG. 7, but illustrating
Considering the operation-of the invention'with refer-v
ence to the semidiagrammatic ' representation thereof.‘
73,026,386
5
provided by the switch 20, 'it' will be assumed that a state
of equilibrium exists with the roller contact 36 in the
recess 26. Under these conditions, the various compo
nents of the switch 20 are in the positions shown in FIG.
6
with an externally threaded nipple 86 adapted to extend
through a panel, not shown, and to have a nut, not
shown, threaded thereon to clamp the base against the
panel for the purpose of panel-mounting the switch 70.
Disposed in the annular shell 72 intermediate the
discs 74 and 76 is an annulus 88 of electrical insulating
material through which the studs 82 extend to hold such
annulus in place. The annulus 88 is provided therein
with a plurality of circumferentially spaced recesses 90,
1 of the drawings.- In other words, the spring 48 main
tains the roller contact 36 in the recess 26, and the springs
54 and 56 position the rotary actuator 50 at the center
of the range of limited relative movement between the
rotary actuator and the rotor 42.
Assuming that it is desired to move the roller contact 10 circumierentially spaced and circumferentially aligned
insulating segments 91 between the recesses 90 in the
36 from the recess 26 into the recess 28, the rotary ac
annulus constituting portions of an arcuate, concave con
tuator 50 is rotated in the counterclockwise direction, as
tact path 92 for circumierentially spaced roller contacts 94
shown in FIG. 2 of the drawings. Until such time as
which will be described in more detail hereinafter. As
the kicker 58 engages the rotor 42, the spring 48 main
will be apparent, the center of curvature of the contact
tains the roller contact 36 in the recess 26 so that rota
path 92 is On the axis of the switch 70.
tion of the rotor 42 is prevented. Consequently, the
Respectively located on opposite sides of the annulus
rotary actuator 50 merely rotates relative to the rotor 42,
88 in longitudinal alignment with each recess 90 are two
thereby compressing the spring 54, shown in FIG. 2 of
stationary contacts 96 adapted to be bridged by each
the drawings.
roller contact 94. In other words, the stationary con
When the limit of the range of rotation of the rotary
tacts 96 of each pair are o?set laterally from the insulat
actuator 50 relative to the rotor 42 is reached, the kicker
ing segments 91 of the contact path 92 and are located
58 engages the rotor 42, whereupon further rotation of
opposite the gap or space between two of such insulating
the rotary actuator results in rotation of the rotor also
segments which is formed by the corresponding recess 90
to force the roller contact 36 out of the recess 26, the
in
the annulus 88. The stationary contacts 96 are pro
25
roller contact being shown in FIG. 3 of the drawings as
vided with recesses 98 therein intermediate the circum
having been moved out of the recess 26 into engagement
ferentially spaced edges thereof, as best shown in FIG.
with the edge of such recess which is nearest the recess
28. It will be noted that, in order to move the roller
contact 36 out of the recess 26, it is necessary to com
press the spring 48, the increasing stress in such spring
thus resisting movement of the roller contact out of the
recess 26. This provides the device with a positive
“feel” and prevents unintentional displacement of the
roller contact 36 out of the recess 26.
As shown in FIG. 4 of the drawings, once the roller
contact 36 clears the recess 26, the energy stored in the
stressed spring 54 causes very rapid rotation of the rotor
42 relative to the rotary actuator 50 in the counterclock
wise direction to cause the roller contact 36 to jump or
14 of the drawings, and the recesses 98 in the stationary
contacts 96 of each pair are located opposite, i.e., in
longitudinal alignment with, one of the recesses 90 in the
annulus 88. The recesses 90 in the annulus 88 are
deeper than the recesses 98 in the stationary contacts 96
so that, when a roller contact 94 is disposed in the re
cesses 98 in the stationary contacts 96 of one pair thereof
the roller contact is out of engagement with the annulus
88.
However, the portions of the stationary contacts
96 adjacent the recesses 98 therein are flush with the por
tions of the annulus 88 between the recesses 99 in the
annulus so that each roller contact 94 rolls smoothly
from the insulating segments of the contact path 92 which
snap into the next recess 28. The range of relative move 40
are formed by the portions of the annulus 88 between
ment between the rotor 42 and the rotary actuator 50
from the centered or neutral position of the rotor relative
to the rotary actuator is such that the energy stored in
spring 54 causes the roller contact 36 to jump all the
way from the recess 26 to the recess 28, irrespective of
any manual manipulation of the rotary actuator 50 which
may occur after the roller contact leaves the recess 26.
In order to accomplish this, the angular range of rela
tive movement between the rotor 42 and the rotary ac
tuator 50 from the centered or neutral position of the
rotor relative to the rotary actuator is at least one-half
the recesses 90 therein onto the portions of the stationary
contacts 96 adjacent the recesses 98 therein.
As best shown in FIG. 12 of the drawings, laterally
o?setting the stationary contacts 96 from the insulating
segments 91 of the contact path 92 formed by the por
tions of the annulus 88 between the recesses 90 therein
results in positioning the stationary contacts out of cir
curnferential alignment with the insulating segments of
the contact path. Consequently, as each roller contact
94 moves along the contact path 92 over the insulating
segments 91 thereof and over the stationary contacts
of the angular spacing of the recesses 26 and 28, and may
96, which also form portions of the contact path, the
approach the angular spacing of such recesses.
roller contact cannot track metal from the stationary
The energy stored in the spring 54 as the kicker 58 is
contacts onto the insulating segments of the contact path
brought into engagement with the rotor 42 to displace
since the portions of the roller contact which engage
the roller contact 36 out of the recess 26, moves the roller
the stationary contacts differ from the portions of the
contact from the recess 26 to the recess 28 extreme
roller contact which engage the insulating segments of
rapidly. This minimizes arcing as electrical contact is
the contact path. This has the effect of preventing metal
made and/or broken.
deposits on the insulating segments of the contact path
60
It will be understood that the switch 20 operates in a
92 which would eventually result in current leakage from
similar manner upon clockwise rotation of the rotary
one pair of stationary contacts to the next after prolonged
actuator 50, the spring 56 and the kicker 60 operating in
usage of the switch 70, offsetting the stationary contacts
the same manner as the spring 54 and the kicker 58.
from the insulating segments of the contact path thus
Turning now to FIGS. 5 to 15 of the drawings, il
being an important feature of the invention for this reason.
lustrated therein is a switch 70 which represents an ac
As best shown in FIG. 14 of the drawings, the sta
tual physical embodiment of the invention, but which
tionary contacts 96 are L-shaped, one arm of each being
has the same general components and operates in the
provided with the corresponding recess 98 therein and
same general manner as the semidiagrammatic represen
the other arm thereof being secured to the annular shell
tation of the invention depicted by the switch 20.
72 by a tubular rivet 100, FlG. 5. Threaded into each
The switch 70 includes a housing which is shown as 70 tubular rivet 100 is a terminal screw 102 by means of
comprising an annular shell 72 closed at its ends by discs
which the desired electrical connection to the correspond
74 and 76, these elements being mounted on a base 80
ing stationary contact 96 may be made. In order to in
by studs 82 extending through the discs 74 and 76 and
sulate the various tubular rivets .100 from each other
threaded into the base 80, and by nuts 84 threaded onto
the outer ends of the studs. The base 80 is provided 75 electrically, the annular shell 72 is formed of electrical
8,026,386
8
7
insulating material. The discs 74 and 76 are also formed
of electrical insulating material, and the studs 82 are
electrically insulated by insulating sleeves 194 telescoped
thereovrer between the annulus 83 and the disc 74 and
between this annulus and the disc 76, such sleeves thereby
also serving to prevent axial movement of the annulus 88.
Considering the remaining components of the switch
.142 and 144 so as tormaintain the coils of these springs
.torsionallystressed ,so that the arms 146 and 14.8 of the
, springs constantly bias the corresponding contact carrier
110 toward the contact path 92.
‘Considering now the rotation transmitting means 116,.
which,.as hereinbefore mentioned, provides a resilient
lost-motion connection between the rotor 11?. and the:
rotary actuator ‘114, it includes spring means comprising
torsion springs 156 and .158 respectively having coils;
tatable about the axis of the switch and which carries 10 which encircle the pins 138 on opposite sides of one of the
the contact carriers 110, a rotary actuator 114 which is
contact carriers 118, the coils of the springs 156 and 1587
70 in a general way, the switch includes a contact carrier
7110 for each roller contact 94, a rotor 112 which is ro
also rotatable about the axis of the switch, rotation trans
mitting means 116 interconnecting the rotor and the
rotary actuator and providing a resilient lost-motion con
respectively encircling the same pins as the coils of the:
springs142 and7144 for biasing the Contact carrier in‘
questiontoward the contact path 92. The spring 156
nection therebetween for transmitting rotation of the ro p15 has radially inwardly extending arms 1607and 162 which
tary actuator to the rotor after limited rotation of the
receive the adjacent pin 140 therebetween and, similarly,
rotary actuator relative to the rotor, and spring means
the spring 158 is provided with radially inwardly ex
118 for biasing each contact carrier 110 away from the
tending arms 164 and 166 which receive therebetween the
axis of the switch so'asto bias the corresponding roller
pin 14% adjacent such spring. The springs 1516 and 153
contact 94 into engagement with the contact path 92
‘are initially so stressed in torsion ‘that the'arms thereof
formed by the annulus 88 and the stationary contacts
are biased into engagement with the corresponding pins
96. ‘The roller contacts 94 are all identical, as are the
contact carriers 110 therefor and the spring means 118
for biasing the roller contacts into engagement with the
contact path. Consequently, vonly one of the roller con
tacts 94 and the components associated therewith need
be considered in detail.
Each contact carrier 11!) consists of a hollow shell hav
ing side walls 125} and end walls 122 substantially com
' pletely' enclosing the corresponding roller contact 94 to
140, which pins serve as stops preventingthese springs,
and the springs 142 and 144, from’ unwinding.
The ,various spring arms 150, 152, ‘160, 162, 164 and
166 project generally radially inwardly into the rotary
actuator 114 and are engageable by stops on such actua
tor which vwill be described hereinafter. In the particular
construction illustrated, therstopsin question are pro
vided by the edges of holesin the rotary actuator 114, but
it Will be understood that the stops'may' be provided by
- minimize arcing, as hereinafter discussed in detail, the
other means, such as longitudinal slots or grooves in the
contact carrier being open only on the side thereof which
rotary actuator,_longitudinalvbars forming parts of the
faces the con-tact path92 to permit engagement of the
rotaryactuator, and the like. Considering the stops men
roller contact with the contact path. Each roller contact
tioned in more detail, the spring arms 150 and 162 are
94 is mounted within the corresponding contact carrier
,engageable either by a stop 168, or by a stop'17ii. The
110 on an axle 124 the ends of which project beyond the
arms 152 andwl64 are engageable either by a stop 172,
ends of the roller contact into radial notches or grooves
or a stop 174. The arm .lt’iii'is engageable either by a
126 in the end walls 122 of the contact carrier. Wi-‘dh
stop 176, or by a stop 178. The arm 166 is engageable by
this construction, assembly of each roller contact 94 with
either a stop 180, or a stop 182. The functional inter
its contact carrier 110 is greatly facilitated, the corre 40 relations'between the various spring arms and stops will
sponding spring means 118, acting to bias the contact car
be cousideredrin the following paragraphs in describing
rier toward the contact path 92, preventing disengagement
the operation of the rotation transmitting means 116 be
of the roller contact from the contact carrier.
tween the rotor 112, and the rotary actuator 114.
Each contact carrier 110 is provided on the end Walls
In considering vthe operation’ of the rotation trans
"122 thereof with external radial ribs 128 which are re 45 mitting means 116, it will be assumed that the various
ceivable in radial notches 130 in discs 132 forming the
parts are in the relative positions shown in FIG. 7 of the
ends of the rotor 112, the ribs 128 being radially mov
drawings andrthat the rotary actuator 114 is to be ro
' able in the notches 130 to permit radial movement of the
tated, in the clockwise direction to advance the corre
corresponding roller contact 94 into and out of the
sponding roller contact 94 from the stationary-contact
recesses '98 in the stationary contacts 96. The discs 132
recesses 98 in which it is disposed to the next pair of
forming the rotor 112 are journalled on the rotary actua
stationary-contactrecesses in the clockwise direction.
tor 114, the latter having a stub shaft 134 journalled in
Asvwill be seen in comparing FIGS, 7 and 8 of the
the disc 76 of the switch housing and having another stub
shaft 136 journalled in the base 80 of the switch housing
drawings, clockwise rotation of the rotary actuator 114
initially produces no rotation of the rotor 112, the springs
and adapted to have a control knob, not shown, ?xed 55 142 and, 144 acting to maintain the corresponding roller
thereon. The discs 132 of the rotor 112 are rigidly in
terconected by circumferentially spaced pins 138 each
located adjacent the outer ‘periphery of the rotor 112, be
tween two of the contact carriers 110, and by pins 140
contact 94 in one of the pairs of stationary-contact
recesses 98 and thus acting to prevent rotation of the
rotor. V However, such initial rotation of the rotary actua
tor 114 causes the stop 168 to displace the spring arm
respectively located radially inwardly of the pins 138
60 150 away fromthe corresponding stop 140 on the rotor,
and adjacent the inner periphery of the rotor.
Considering the spring ‘means 118 forv biasing each
roller contact 94 into engagement with the contact path
as shown in FIG. 8, thereby increasing the torsional
stress in the spring 142 and thus increasing the spring
force acting to hold the corresponding roller contact 94
in the pair of stationary-contact recesses 98 in which it
is disposed. It will be noted that the torsional stress in
92, it includes, as best shown in FIGS. 7 to ll, at least
two torsion springs 142 and 144.
The spring 142 in
cludes a coil encircling the pin .138 on one side of the
the other spring 144 which acts on the corresponding con
‘corresponding contact carrier 1'10, and the spring 144
tact carrier 11% is not increased in response to clock
similarly includes a coil encircling the pin 138 on the op
' posit/e side of such contact carrier. The springs 142
and 144 respectively include anns 146 and 148 which en
W186 rotation of the rotary actuator 114 relative to the
rotor 112. (However, counterclockwise rotation of the
rotary actuator 114 relative to the rotor 112 stresses the
gage the corresponding contact carrier 110, as clearly
shown in FIGS. 7 and 8. The springs 142 and 144 also
respectively include arms 158 and 152 which respectively
engage two of the pins 140 of the rotor 112, these pins
acting as stops :for the arms. 15ilancl 152 ofthe springs
force acting on the corresponding roller contact 94 to bias
it into engagement with the contact path 92.)
The initial clockwise rotation of the rotary actuator
11% relative to the rotor 112Valso causes the stop 168 to
spring 144, but not the spring 142, to increase the spring
3,026,386
9
recesses 90 therein, the radial clearance between the
arc barriers 184 and the portions of the contact path
92 between the stationary-contact recesses 96 being not
move the spring arm 162 away from the corresponding
stop pin 140, and causes the stop 180 to move the spring
arm 166 away from its corresponding stop pin 140, as
more than 0.015 inch.
shown in FIG. 8, thereby increasing the torsional stresses
in the springs 156 and 158. Consequently, energy is
stored in these springs.
When the rotary actuator 114 has been rotated rela
tive to the rotor 112 to the extent permitted by the lost‘
motion connection provided by the rotation transmitting
means 116, the stop 176 engages the spring arm 160 and
the stop 172 engages the spring arms 152 and 164, these
Which do form and help in controlling phase-to-phase
?ashover.
wise direction With the rotary actuator 114 by the corre
sponding stop pins 140. Consequently, the stops 172 and
176 act as kickers to force the rotor 112 to rotate with 15
and thus serve to kick or positively displace the corre
Also, the arc barriers 1S4 act as physical
barriers which prevent foreign matter from shorting
10 various components of the switch 70 since they constantly
spring arms being prevented from moving in the clock
the rotary actuator 114 upon further rotation of the latter,
Thus, the arc barriers 184 co
operate with the contact path 92 to provide a highly con
stricted arc chute through which arcing must occur. Con
sequently, the arc barriers 184 aid in quenching any arcs
displace any foreign matter which may enter the switch.
Considering the other arc-minimizing means mentioned
earlier, each contact carrier 110, as hereinbefore sug
gested, substantially completely encloses the correspond
ing roller contact 94. In other words, the side walls 120
and the end walls 122 of the contact carrier cover just
as much of the roller contact 94 as possible, the roller
sponding roller contact 94 out of the stationary-contact
contact projecting from the carrier 110 just far enough
recesses 93 in which it is disposed.
At this point, the energy stored in the springs 156 and 20 that the side walls 120 clear the contact path 92 when
the roller contact is in one of the pairs of stationary
153, and in the spring 142, causes the roller contact 94
contact recesses 98. However, the clearance between the
to jump to the next pair of stationary-contact recesses
side walls 125} and the contact path 92 under such con
with a snap action. As hereinbefore discussed in connec—
ditions does not exceed 0.015 inch. With this small
tion with the semidiagrammatic representation of the in
vent-ion illustrated in FIGS. 1 to 4 of the drawings, this 25 clearance, even if an arc does form when the roller con
tact 94 is between two of the pairs of stationary-contact
jumping of the roller contact 94 from one pair of recesses
recesses 98, the chute through which the arc must pass
to the next occurs very rapidly so as to minimize arcing.
is immediately constricted to a thickness of not more than
Also, the energy stored in the springs 1'42, 156 and 158
0.015 inch when the roller contact 94 drops into the
and the range of relative movement between the rotary
next pair of stationary-contact recesses 98. Thus, even
actuator 114 and the rotor 112 trom a centered or neu
if any are which may be formed is not quenched before
tral position of the rotary actuator relative to the rotor
the roller contact drops into the next pair of stationary
are such that the jump of the roller contact to the next
contact recesses 98, the sudden reduction in the size of the
pair of recesses occurs irrespective of any manual manipu
arc chute as the roller contact drops into the next pair of
lations which may occur after the roller contact leaves
D recesses will positively quench any continuing arc.
the preceding pair of recesses.
As a further means of minimizing arcing, the end walls
The action of the rotation transmitting means 116 is
122 of each contact carrier 110 completely cover the
similar in response to counterclockwise rotation of the
ends of the corresponding rolier contact 94, and the end
rotary actuator 114, except that, as hereinbefore stated,
walls overlap the stationary contacts 96.
the stop 174 increases the torsional stress in the spring
Although exemplary embodiments of the invention have
144 to increase the spring force acting on the correspond 40
been disclosed herein for purposes of illustration, it will
ing contact carrier 110, there being no increase in the
be understood that various changes, modi?cations and
torsional stress in the spring 142 under such conditions.
substitutions may be incorporated in such embodiments
Also, the stops 178 and 174 respectively increase the
without departing from the spirit of the invention as‘ de
torsional stresses in the springs 156 and 158, the stops
?ned by the claims which follow.
168 and 180 being inoperative under these circumstances.
What is claimed is:
During counterclockwise rotation, the stops 170 and 182
1. In a switch, the combination of: an arcuate contact
act as kickers, instead of the stops 176 and 172.
path having va center of curvature and having circum
in instances where lesser amounts of stored energy for
ferentially spaced recesses therein and having thereon
causing the motor 112 to jump the roller contact 94 into
the next pair of recesses may be utilized, one or both of 50 at least one stationary contact in which one of said re—
cesses is formed; a contact carrier movable adjacent and
the springs 156 and 158 may be omitted, relying only
parallel to said contact path; a roller contact carried by
on the energy stored in that one of the springs 142 and
said contact carrier and engaging and movable along said
144 the stress in which is increased in response to clock
contact path and receivable in each of said recesses; actu—
wise or counterclockwise rotation of the rotary actuator
114 relative to the rotor 112. Thus, varying amounts 55 ating means movable about said center of curvature of
said contact path for moving said contact carrier adjacent
of stored energy may be utilized, depending upon the
and parallel to said contact path, said actuating means in
rate of roller-contact movement desired.
cluding a rotor and a rotary actuator rotatable relative to
It will be understood that for each of the roller con
said rotor about said center of curvature of said contact
tacts 94 carried by the rotor 112, there is a set of springs
path, said contact carrier being carried by said rotor;
and stops similar to those hereinbefore described and op
and rotation transmitting means interconnecting said
rotor and said rotary actuator and providing a resilient
lost-motion connection therebetween for transmitting rota
While the hereinbefore-discussed rapid roller-contact
tion of said rotary actuator to said rotor after limited
movement from one pair of stationary-contact recesses
98 to the next minimizes arcing, the present invention 65 rotation of said rotary actuator relative to said rotor,
said rotation transmitting means including spring means
provides two additional means for further minimizing
carried by said rotor and spaced radially outwardly from
arcing. The ?rst of these additional arc-minimizing means
said center of curvature of said contact path and having
includes arc barriers 184 of electrical insulating material
arms which extend toward said center of curvature of
between adjacent roller contacts 94, there being one such
are barrier between each pair of adjacent roller contacts. 70 said contact path and which terminate in free ends ad
jacent said center of curvature of said contact path.
The are barriers 184 are disposed between the discs 132
2. In a switch, the combination of: an arcuate contact
cf the rotor 112 and are suitably secured to such discs.
path having a center of curvature and having circumfer
These arc barriers are substantially in sliding engage
erating in a similar manner so that a detailed descrip
tion is unnecessary.
entially spaced recesses therein and having thereon at
ment with the insulating segments 91 of the contact path
92 formed by the portions of the annulus 88 between the 75 least one stationary contact in which one of said recesses
3,02e,sse
11
is formed, said contact path having an angular extent
of 360°; a contact carrier movable adjacent and parallel
12
including a rotor and a rotary actuator rotatable relative
to said rotor about said center of curvature of said con
to said contact path; a roller contact carried by said
contact carrier and engaging and movable along said
contact path and receivable in each of said recesses; actu
ating means movable about said center of curvature of said
tact path, said contact carrier being carried by said rotor;
rotation transmitting means interconnecting said rotor and
said rotary actuator and providing a resilient lost-motion
connection therebetween for transmitting rotation of said
contact path for moving said contact carrier adjacent
rotary actuator to said rotor after limited rotation of
and parallel to said contact path, said actuating means
said rotary actuator relative to said rotor, said rotation
including a rotor and a rotary actuator rotatable relative
transmitting means including torsion spring means carried
to said rotor about said center of curvature of said con 10 by said rotor and having arms which extend toward said
tact path, said contact carrier being carried by said rotor;
center of curvature of said contact path; and another
and rotation transmitting means interconnecting said rotor
torsion spring means interconnecting said rotor and said
and said rotary actuator and providing a resilient lost
contact carrier for biasing said contact carrier toward
motion connection therebetween for transmitting rotation
said contact path.
'
of said rotary actuator to said rotor after limited rotation
6. In a switch, the combination of: an arcuate contact
of said rotary actuator relative to said rotor, said rota
path having a center of curvature and having circumfer
tion transmitting means including spring means carried
entially spaced recesses therein and having thereon at least
by said rotor and spaced radially outwardly from said
one stationary contact in which one of said recesses is
center of curvature of said contact path and having
arms which extend toward said center of curvature of
said contact path and which terminate in free ends ad
jacent said center of curvature of said contact path.
formed; a contact carrier movable adjacent and parallel
to said contact path; a roller contact carried by said
contact carrier and engaging and movable along said
contact path and receivable in each of said recesses;
actuating means movable about said center of curvature
of said contact path for moving said contact carrier
3. In a switch, the combination of: an arcuate con
tact path having a center of curvature and having cir
cumferentially spaced recesses therein and having thereon
adjacent and parallel to said contact path, said actuating
at least one stationary contact in which one of said re
means including a rotor and a rotary actuator rotatable
cesses is formed, said contact path including at least two
relative to said rotor about said center of curvature of said
circumferentially aligned and circumfer'entially spaced
contact path, said contact carrier being carried by said
segments of electrical insulating material, said stationary
rotor; and a rotation transmitting means interconnecting
contact being o?set to one side of said aligned segments 30 said rotor and said rotary actuator and providing a resili
opposite the space therebetween; a contact carrier mova
ent lost-motion connection therebetween for transmitting
ble adjacent and parallel to said contact path; a roller
rotation of said rotary actuator to said rotor after limited
contact carried by said contact carrier and engaging and
rotation of said rotary actuator relative to said rotor,
movable along said contact path and receivable in each
said rotation transmitting means including a torsion spring
of said recesses; actuating means movable about said
having a coil carried by said rotor and having two arms
center of curvature of said contact path for moving said
which extend toward said center of curvature of said
contact carrier adjacent and parallel to said contact path,
contact path, said rotary actuator having a stop thereon
said actuating means including a rotor and a rotary actu
ator rotatable relative to said rotor about said center of
curvature of said contact path, said contact carrier being
carried by said rotor; and rotation transmitting means
interconnecting said rotor and said rotary actuator and
providing a resilient lost-motion connection therebetween
for transmitting rotation of said rotary actuator to said
rotor after limited rotation of said rotary actuator rela
tive to said rotor, said rotation transmitting means in
cluding spring means carried by said rotor and spaced
radially outwardly from said center of curvature of said
contact path and having arms which extend toward said
center of curvature of said contact path and which ter- ,
minate in free ends adjacent said center of curvature of
said contact path.
4. In a switch, the combination of: a contact path
including at least two aligned, spaced segments of elec
which is engageable with one of said arms to tend to
move said one arm relative to the other of said arms in
a direction to stress said coil in response to rotation of
said rotary actuator relative to said rotor, said rotor
having thereon a stop which is engageable by said other
'arm to prevent movement of said other arm with said
one arm in response to rotation of said rotary actuator
relative to said rotor so that rotation of said rotary actu
ator relative to said rotor stresses said coil, said rotary
actuator having thereon a kicker which is engageable
with said other arm in response to rotation of said rotary
actuator relative to said rotor through a predetermined
angle to kick said roller contact out of the recess in said
contact path in which it is disposed, whereby said stressed
coil rotates said rotor relative to said rotary actuator
with a snap action to move said roller contact into the
trical insulating material and two stationary contacts re
next one of said recesses in said contact path.
7_ In a switch, the combination of: an arouate contact
spectively o?set to opposite sides of said aligned segments
path having a center of curvature and having circum
opposite the space therebetween; and a roller contact
of a length to bridge the space between said stationary
least one stationary cont-act in which one of said recesses
contacts and movable over one of said segments, said
is formed; a contact carrier movable adjacent and parallel
ferentially spaced recesses therein and having thereon at
stationary contacts and the other of said segments in se
60 to said contact path; a roller contact carried by said con
quence, whereby one portion of said roller contact en
tact carrier and engaging and movable along said contact
gages said segments and other portions thereof engage said
path and receivable in each of said recesses; actuating
stationary contacts to avoid tracking of metal from said
means movable about said center of curvature of said
stationary contacts onto said segments.
contact path for moving said contact carrier adjacent and
5. In a switch, the combination of: an arcuate contact 65 parallel to said contact path, said actuating means includ
path having a center of curvature and having circumfer
ing a rotor and a rotary actuator rotatable relative to said
entially spaced recesses therein and having thereon at
rotor about said center of curvature of said contact path,
least one stationary contact in which one of said recesses
said contact carrier being carried by said rotor; a rotation
is formed; a contact carrier movable adjacent and parallel
transmitting means interconnecting said rotor and said
to said contact path; a roller contact carried by said
70 rotary actuator and providing a resilient lost-motion con
contact carrier and engaging and movable along said con
nection therebetween for transmitting rotation of said
tact path and receivable in each of said recesses; actu
rotary actuator to said rotor after limited rotation of said
ating means movable about said center of curvature of
rotary actuator relative to said rotor, said rotation trans
said contact path for moving said contact carrier adjacent
and parallel to said contact path, said actuating means
mitting means including a torsion spring having a coil
carried by said rotor and having two arms which extend
3,026,386
13
toward said center of curvature of said contact path,
said rotary actuator having a top thereon which is en
gageable with one of said arms to tend to move said one
arm relative to the other of said arms in a direction to
stress said coil in response to rotation of said rotary
actuator relative to said rotor, said rotor having thereon
a stop which is engageable by said other arm to prevent
movement of said other arm with said one arm in response
14
10. In a switch, the combination of: an arcuate con
tact path having a center of curvature and having cir
cumferentially spaced recesses therein and having thereon
at least one stationary contact in which one of said recesses
is formed; a contact carrier movable adjacent and par
allel to said contact path; a roller contact carried by said
contact carrier and engaging and movable along said con
tact path and receivable in each of said recesses; actuat
ing means movable about said center of curvature of said
to rotation of said rotary actuator relative to said rotor
so that rotation of said rotary actuator relative to said 10 contact path for moving said contact carrier adjacent and
rotor stresses said coil, said rotary actuator having thereon
a kicker which is engageable with said other arm in re
sponse to rotation of said rotary actuator relative to said
rotor through a predetermined angle to kick said roller
contact out of the recess in said contact path in which
parallel to said contact path, said actuating means in
cluding a rotor ‘and a rotary actuator rotatable relative
to said rotor about said center of curvature of said con
tact path, said contact carrier being carried by said rotor;
and rotation transmitting means interconnecting said rotor
and said rotary actuator and providing a resilient lost
motion connection therebetween for transmitting rota
relative to said rotary actuator with a snap action to move
tion of said rotary actuator to said rotor after limited
said roller contact into the next one of said recesses in
rotation of said rotary actuator relative to said rotor,
said contact path; and another torsion spring intercon
meeting said rotor and said contact carrier and biasing 20 said rotation transmitting means including spring means
resiliently connecting said rotor to said rotary actuator
said contact carrier toward said contact path, said other
and carried by said rotor and including two arms which
torsion spring including a coil carried by said rotor and
extend toward said center of curvature of said contact
including arms respectively engaging said rotor and said
path, said rotation transmitting means including stops
contact carrier.
it is disposed, whereby said stressed coil rotates said rotor
8. In a switch, the combination of: an arcuate contact
path having -a center of curvature and having circum
ferentially spaced recesses therein and having thereon
respectivelycarried by said rotor and said rotary actuator
and respectively engageable with said arms of said spring
means so as to stress said spring means in response to
rotation of said rotary actuator relative to said rotor, said
rotary actuator having thereon a kicker which, after ro
cesses is formed; a contact carrier movable adjacent and
parallel to said contact path; a roller contact carried by 30 tation of said rotary actuator relative to said rotor through
a predetermined angle, is engageable with that arm of said
said contact carrier and engaging and movable along said
spring means which is engageable with said stop on said
contact path and receivable in each of said recesses;
rotor.
actuating means movable (about said center of curvature
at least one stationary contact in which one of said re
of said contact path for moving said contact carrier adja
cent and parallel to said contact path, said actuating means
including a rotor and a rotary vactuator rotatable relative
to said rotor about said center of curvature of said con
tact path, said contact carrier being carried by said rotor;
rotation transmitting means interconnecting said rotor
and said rotary actuator and providing a resilient lost
motion connection therebtween for transmitting rotation
of said rotary actuator to said rotor after limited rotation
11. In a switch, the combination of: an arcuate con
tact path having a center of curvature and having cir
curnferentially spaced recesses therein and having thereon
at least one stationary contact in which one of said recesses
is formed; a contact carrier movable adjacent and par
allel to said contact path; a roller contact carried by said
contact carrier and engaging and movable along said
contact path and receivable in each of said recesses;
actuating means movable about said center of curvature
of said contact path for moving said contact carrier ad
jacent and parallel to said contact path, said actuating
cluding a torsion spring interconnecting said rotor and
said cont-act carrier for biasing said contact carrier to 45 means including a rotor and a rotary actuator rotatable
relative to said rotor about said center of curvature of
ward said contact path, said torsion spring including a
said contact path, said contact carrier being carried by
coil carried by said rotor and including two arms respec
said rotor; and rotation transmitting means interconnect
tively engaging said rotor and said contact carrier.
ing said rotor and said rotary actuator and providing a
9. In a switch, the combination of: an arcuate contact
path having a center of curvature and having circum 50 resilient lost-motion connection therebetween for trans
mitting rotation of said rotary actuator to said rotor
ferentially spaced recesses therein and having thereon at
, of said rotary actuator relative to said rotor; ‘and means in
least one stationary contact in which one of said recesses
is formed; a contact carrier movable adjacent and parallel
to said contact path; a roller contact carried by said con
after limited rotation of said rotary actuator relative to
said rotor, said rotation transmitting means including
two spring means respectively carried by said rotor on
tact carrier and engaging and movable along said contact 55 opposite sides of said contact carrier in circumferentially
spaced relation and each having two arms extending to
path and receivable in each of said recesses; actuating
Ward said center of curvature and connecting said rotor
to said rotary actuator.
12. In a switch, the combination of: an arcuate con
including a rotor and a rotary actuator rotatable relative 60 tact path having a center of curvature and having cir
cumferentially spaced recesses therein and having thereon
to said rotor about said center of curvature of said con
at least one stationary contact in which one of said recesses
tact path, said contact carrier being carried by said rotor;
means movable about said center of curvature of said
contact path for moving said contact carrier adjacent
and parallel to said contact path, said actuating means
is formed; a contact carrier movable adjacent and parallel
and rotation transmitting means interconnecting said rotor
to said contact path; a roller contact carried by said con
and said rotary ‘actuator and providing a resilient lost
motion connection therebetween for transmitting rota 65 tact carrier and engaging and movable ‘along said contact
path and receivable in each of said recesses; actuating
‘tion of said rotary actuator to said rotor after limited
means movable about said center of curvature of said
rotation of said rotary actuator relative to said rotor,
contact path for moving said contact carrier adjacent
said rotation transmitting means including spring means
and panallel to said contact path, said actuating means
resiliently connecting said rotor to said rotary actuator
and carried by said rotor and spaced radially outwardly 70 including a rotor and a rotary actuator rotatable relative
to said rotor about said center of curvature of said con
from said center of curvature of said contact path and
tact path, said contact carrier being carried by said rotor
including two arms which extend toward said center of
and being movable relative thereto toward and away
curvature of said contact path and which terminate in
from said center of curvature of said contact path; and
free ends adjacent said center of curvature of said con
tact path.
75 rotation transmitting means interconnecting said rotor
3,026,386
15
16
and said rotary actuator and providing a resilient lost
motion connection therebetween for transmitting rotation
of said rotary actuator to said rotor after limited rotation
rotor, said rotation transmitting means including two
spring means respectively located on opposite sides of
said contact carrier in circumferentially spaced relation
and each connecting said rotor to said rotary actuator;
of said rotary actuator relative to said rotor, said rotation ,
transmitting means including two spring means respective
-ly carried by said rotor on opposite sides of said contact
carrier in circumferentially spaced relation and each hav
and an arc barrier carried by said rotor and circumferen
being substantially in engagement with said contact path
cont-act and said are barrier along said contact path.
18. A switch as de?ned in claim 17 wherein there is
a clearance of not more than about 0.015 inch between
said arc barrier and said contact path.
19. In a switch, the combination of: a contact path
having spaced recesses therein and having thereon at least
one stationary contact in which one of said recesses is
formed; a contact carrier movable adjacent and parallel
to said contact path; a roller contact rotatably mounted
on said contact carrier and engaging and movable along
said contact path and receivable in each of said recesses,
said contact carrier being a shell having side walls re
tially spaced from said contact carrier in circumferential
alignment therewith, said are barrier being substantially
ing two arms extending toward said center of curvature
in sliding engagement with said contact path and being
and connecting said rotor to said rotary actuator.
aligned with said movable and stationary contacts in the
‘13. In a switch, the combination of: an arcuate con 10 direction of said contact path.
tact path having a center of curvature and having cir
17. In a switch, the combination’ of: a contact path
cumferentially spaced recesses therein and having thereon
having at least one stationary contact thereon; a movabie
at least one stationary contact in which one of said recesses
contact movable along said contact path and engageable
is formed; a contact carrier movable adjacent and par
with said stationary contact; an arc barrier spaced from
allel to said contact path; a roller contact carried by said 15 said movable contact in the direction of said contact path
contact carrier and engaging and movable along said
and movable with said movable con-tactralong said con
contact path and receivable in each of said recesses, said
tact path, said arc barrier being substantially in sliding
contact carrier being a shell which substantially com
engagement with said contact path and being aligned with
pletely encloses said roller contact and which is open only
said movable and stationary contacts in the direction of
on the side thereof that ‘faces said contact path, said shell 20 said contact path; and means for moving said movable
when said roller contact is in one of said recesses; actu
ating means movable about said center of curvature of
said contact path for moving said contact carrier adjacent
and parallel to said contact path, said actuating means
including a rotor and a rotary actuator rotatable relative
to said rotor about said center of curvature of said con
tact path, said contact carrier being carried by said rotor;
, and rotation transmitting means interconnecting said rotor
and said rotary actuator and providing a resilient lost
motion connection therebetween for transmitting rotation
of said rotary actuator to said rotor after limited rotaion
of said roary actuator relative to said rotor, said rotation
transmitting means including two spring means respec
tively carried by said rotor on opposite sides of said con
spectively disposed on opposite sides of said roller contact
and having end walls respectively disposed at opposite
‘ ends of said roller contact, said shell substantially com
tact carrier in circum'ferentially spaced relation and each
having two arms extending toward said center of curvature
pletely enclosing said roller contact and being open only
on the side thereof which faces said contact path, said
side walls of said shell being substantially in engage
and connecting said rotor to said rotary actuator.
14. In a switch, the combination of: a contact path
ment with said contact path when said roller contact is in
having spaced recesses therein and having thereon at least 40 one of said recesses; andactuating means for moving said
contact carrier adjacent and parallel to said contact path.
one stationary contact in which one of said recesses is
20. In a switch, the combination of: a contact path
formed; a contact carrier movable adjacent and parallel
having spaced recesses therein and having thereon at least
to said contact path; a movable contact carried by said
one stationary contact in which one of said recesses is
contact carrier and engaging and movable along said
contact path and receivable in each of said recesses, said 45 formed; a contact carrier movable adjacent and parallel to
said contact path; a roller contact rotatably mounted
contact carrier being a shell which substantially com
on said contact carrier and engaging and movable along
pletely encloses said movable contact and which is open
only on the side thereof that faces said contact path, said
said contact path and receivable in each of said recesses;
an arc banier spaced from said contact carrier in the
shell being substantially in engagement with said contact
path when said movable contactis in one of said recesses; 50 direction of said contact path and movable with said con
and actuating means for moving said contact carrier ad
tact carrier along said contact path, said are barrier being
jacent and parallel to said contact path.
substantially in sliding engagement with said contact path
and being aligned with said movable and stationary con
15. A switch as de?ned in claim 14 wherein the clear
tacts in the direction of said contact path; and means for
ance between said shell and said contact path‘ does not
exceed about 0.015 inch when said movable contact is in 55 moving said contact carrier and said are barrier along
said contact path.
one of said recesses.
tact path having a center of curvature and having cir
cumferentially spaced recesses therein and having thereon
cumferentially spaced recesses therein and having thereon
at least one stationary contact in which one of said re
cesses is formed; a contact carrier movable adjacent and
parallel to said contact path; a roller contact carried by
.said contact carrier and engaging and movable along said
contact path and receivable in each of said recesses;
actuating means movable about said center of curvature
of said contact path for moving said contact carrier ad
'
21. In a rotary switch, the combination of: an arcuate
contact path having a center of curvature and having cir
16. In a switch, the combination of: an arcuate con
60
at least one stationary contact in which one of said re
cesses is formed; a con-tact carrier movable adjacent and
parallel to said contact path; a roller contact carried by
said contact carrier and engaging and movable along said
contact path and receivable in each of said recesses;
actuating means movable about said center of curvature
of said contact path for moving said contact carrier
jacent and parallel to said contact path, said actuating
adjacent and parallel to said contact path, said actuating
means including a rotor and 1a rotary actuator rotatable
means including a rotor and a rotary actuator rotatable
relative to said rotor about said center of curvature of
‘ relative to said rotor about said center of curvature of
said contact path, said contact carrier being carried by 70 said contact path, said contact carrier being carried by
said rotor and being movable relative thereto toward and
said rotor; rotation transmitting means interconnecting
said rotor and said rotary actuator and providing a re
away from said contact path along a carrier path ex
silient lost-motion connection therebetween for trans
mitting rotation of said rotary actuator to said rotor after
tending radially from said center of curvature, said con
tact carrier being mounted on said rotor for movement
limited rotation of said rotary actuator relative to said 75 relative thereto toward and away from said contact path
3,026,386
17
along said carrier path by means including interengage
able elements on said contact carrier and said rotor, said
rotor including two spaced plates having said contact
carrier therebetween, said interengageable elements being
18
jacent and parallel to said contact path; a roller contact
carried by said contact carrier and engaging and mov
able along said contact path and receivable in each of
said recesses; actuating means movable about said center
of curvature of said contact path for moving said con
tact carrier adjacent and parallel to said contact path,
on said plates and said contact carrier; and spring means
mounted on said rotor and spaced radially outwardly
said actuating means including an annular rotor and a
from said center of curvature of said contact path and
rotary
actuator rotatable relative to said rotor about said
interconnecting said rotor, said rotary actuator and said
center of curvature of said contact path, said contact
contact carrier, and providing a resilient lost-motion con
nection between said rotor and said rotary actuator, for 10 carrier being carried by said rotor and said rotary actu
ator being disposed Within said rotor; and rotation trans
transmitting rotation of said rotary actuator to said rotor
mitting means interconnecting said rotor and said rotary
after limited rotation of said rotary actuator relative to
actuator and providing a resilient lost-motion connec
said rotor and for biasing said contact carrier toward said
tion
therebetween for transmitting rotation of said rotary
contact path so as to bias said roller contact into engage
actuator to said rotor after limited rotation of said rotary
ment with said contact path.
15
actuator relative to said rotor, said rotation transmitting
22. In a rotary switch, the combination of: an arcuate
means including spring means resiliently connecting said
contact path having a center of curvature and having cir
rotor to said rotary actuator and extending generally
cumferentially spaced recesses therein and having thereon
radially inwardly from within said rotor to within said
at least one stationary contact in which one of said re
cesses is formed; a contact carrier movable adjacent and 20 rotary actuator.
26. In a switch, the combination of: an annular arcu
parallel to said contact path; a roller contact carried by
ate contact path having a center of curvature and having
said contact carrier and engaging and movable along
circumferentially spaced recesses therein and having
said contact path and receivable in each of said recesses;
actuating means movable about said center of curvature
thereon at least one stationary contact in which one of
means mounted on said rotor and spaced radially out
ator rotatable relative to said rotor about said center of
of said contact path for moving said contact carrier 25 said recesses is formed; a contact carrier movable ad
jacent and parallel to said contact path; a roller contact
adjacent and parallel to said contact path, said actuating
carried by said contact carrier and engaging and movable
means including a rotor and a rotary actuator rotatable
along said contact path and receivable in each of said
relative to said rotor about said center of curvature of
recesses; actuating means movable about said center of
said contact path, said contact carrier being carried by
curvature of said contact path for moving said contact
said rotor and being movable relative thereto toward and
carrier
adjacent and parallel to said contact path, said actu
away from said contact path along a carrier path extend
ating means including an annular rotor and a rotary actu
ing radially from said center of curvature; and spring
wardly from said center of curvature of said contact path
and interconnecting said rotor, said rotary actuator and
said contact carrier, and providing a resilient lost-motion
connection between said rotor and said rotary actuator,
for transmitting rotation of said rotary actuator to said
rotor after limited rotation of said rotary actuator rela
tive to said rotor and for biasing said contact carrier 40
toward said contact path so as to bias said roller contact
into engagement with said contact path, said spring means
curvature of said contact path, said contact carrier being
carried by said rotor and said rotary actuator being dis
posed within said rotor; and rotation transmitting means
interconnecting said rotor and said rotary actuator and
providing a resilient lost-motion connection therebetween
for transmitting rotation of said rotary actuator to said
rotor after limited rotation of said rotary actuator rela
tive to said rotor, said rotation transmitting means in
cluding spring means resiliently connecting said rotor
to said rotary actuator and mounted on said rotor out
comprising a plurality of arms mounted on said rotor and
wardly of said rotary actuator and extending generally
engaging said rotor, said rotary actuator and said contact
carrier, said spring means also including at least two tor 45 radially inwardly from within said rotor to within said
rotary actuator.
sion springs each having a coil mounted on said rotor and
27. In a switch, the combination of : an annular arcu
each providing two of said arms.
ate contact path having a center of curvature and having
23. A switch according to claim 22 wherein said rotor
circumferentially spaced recesses therein and having
and said rotary actuator are provided with elements en
gageable with one of said arms after limited rotation of 50 thereon at least one stationary contact in which one of
said recesses is formed; a contact carrier movable ad
said rotary actuator relative to said rotor to transmit ro
jacent and parallel to said contact path; a roller contact
tation of said rotary actuator to said rotor.
carried by said contact carrier and engaging and movable
24. In a switch, the combination of: a contact path in
along said contact path and receivable in each of said
cluding insulating portions of electrical insulating mate
rial and conductive portions of electrically conductive ma 55 recesses; actuating means movable about said center of
curvature of said contact path for moving said contact
terial, said insulating portions and said conductive por
carrier
adjacent and parallel to said contact path, said
tions being spaced apart in the direction of said contact
actuating means including an annular rotor and a rotary
path, said insulating portions and said conductive por
actuator rotatable relative to said rotor about said center
tions being misaligned in the direction of said contact
path, and said insulating portions and said conductive por 60 of curvature of said contact path, said contact carrier
being carried by said rotor and said rotary actuator
tions being staggered in the direction of said contact path
being disposed within said rotor; and rotation trans
so that said conductive portions are laterally opposite the
spaces between said insulating portions; ‘and a contact
mitting means interconnecting said rotor and said rotary
actuator and providing a resilient lost-motion connection
movable along said contact path and engageable with said
insulating portions and said conductive portions in se 65 therebetween for transmitting rotation of said rotary
actuator to said rotor after limited rotation of said
quence, di?erent parts of said movable contact being en
rotary actuator relative to said rotor, said rotation trans
gageable with said insulating portions and said conductive
mitting means including spring means resiliently con
portions as said movable contact moves along said contact
necting said rotor to said rotary actuator and extending
path so as to avoid tracking of said conductive material
generally radially inwardly from within said rotor to
onto said insulating material.
70
25. In a switch, the combination of: an annular arcu
ate contact path having a center of curvature and having
within said rotary actuator; said rotation transmitting
means including stop means on said rotor and said
rotary actuator and engageable with said spring means
for stressing said spring means in response to rotation
thereon at least one stationary contact in which one of
said recesses is formed; a contact carrier movable ad 75 of said rotary actuator relative to said rotor.
circumferentially spaced recesses therein and having
19
3,026,386
28. In a switch, the combination of: an annular arcu
ate contact path having a center of curvature and having
circumferentially spaced recesses therein and having
20
ing generally radially inwardly from within said rotor
to within said rotary actuator; said rotation transmitting
means including stop means on said rotor and said rotary
thereon at least one stationary contact in which one of
actuator and engageable with said spring means for
said recesses is formed; a contact carrier movable ad 5 stressing said spring means in response to rotation of
jacent and parallel to said contact path; a roller con
said rotary actuator relative to said rotor and for limiting
tact carried by said contact carrier and engaging and
rotation of said rotary actuator relative to said rotor.
movable along said contact path and receivable in each
of said recesses; actuating means movable about said
center of curvature of said contact path for moving said
contact carrier adjacent and parallel to said contact path,
said actuating means including an annular rotor and a
rotary actuator rotatable relative to said rotor about
said center of curvature of said contact path, said con
tact carrier being carried by said rotor and said rotary 15
actuator being disposed Within said rotor; and rotation
transmitting means interconnecting said rotor and said
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,889,637
Cook _______________ _._ Nov. 29, 1932
2,015,399
2,163,919
2,483,115
2,554,506
2,831,082
Grothe _____________ __ Sept. 24,
Siegel _______________ .._ June 27,
Wall ______________ _.'._ Sept. 27,
Schwarz ____________ __ May 29,
Mason ______________ __ Apr. 15,
413,976
571,395
612,509
730,971
473,219
Great Britain __________ __ July 26,
Great Britain _________ __ Aug. 22,
Germany ____________ __ Apr. 26,
France ______________ __ May 24,
Italy ________________ __ July 18,
rotary actuator and providing a resilient lost-motion con
nection therebetween for'transmitting rotation of said
rotary actuator to said rotor after limited rotation of 20
said rotary actuator relative to said rotor, said rotation
transmitting means including spring means resiliently
connecting said rotor to said rotary actuator and extend
1935
1939
1949
1951
1958
FOREIGN PATENTS
1934
1945
1935
1932
1952
UNITED STATES PATENT OFFICE
CERTIFICATE OF CORRECTION
Patent No. 3,026,386
‘
March 20, 1962
Howard F. Mason
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
Column 5, line 57, for "extreme" read —— extremely —;;
column 7, lines 56 and 57, for "interconected" read —- inter
connected —-; column 9, line 49, for "motor" read —— rotor --;
column 13, line 2, for "top" read —- stop ——; column 15, line
33, for "roary" read —- rotary ——.
Signed and sealed this 10th day of July 1962,
(SEAL)
Attest:
ERNEST w. SWIDER
Attesting Officer
DAVID L- LADD
,
Commissioner of Patents
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