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Патент USA US2128373

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A118- 30, 1938-
-
H. 1_. MEKELBURG
CIRCUIT CONTROLLING DEVICE
2,128,373
Aug. 30, 1938.`
H. L. MEkx-:LBURG
3
2,128,373
CIRCUIT CONTROLLING DEVICE
Filed Feb. 18, 1937
2 Sheets-Sheet 2
l @Mv/MMX
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2,128,373
Patented» Auhg. 30, 1938--
AUNITED STATES PATENT o-EFIÍCE omcm'r coN'rRoLLlNG DEVICE
Harold L. Mekelburg, Milwaukee, Wis., asslgnor l
to Cutler-Hammer, Inc., Milwaukee, Wis.,y a cor- f
poration of Delaware
Application February 18, 1937, Serial No. 126,367
10 Claims. (Cl. 20o-_6)
This invention relates to'circuit controlling de
comprising a frame 9 having a ‘rear wall I0 and
vices; and while not limited thereto‘is particu
top and bottom.walls II and I2, and an asso- '
larly applicable to multi-pole reversing switches ciated U-shaped cover I3.
More speciñcally, contact element I is pro
vided with a plurality of molded insulating sec- 5
tions I4 which are mounted side by side upon’ switch consisting of parts which can be economi- ~ an operating shaft I5. Said insulating sections
'
for'electric motors.
5
.
The invention has among its objects to pro
vide an exceedingly compact and rugged control
A cally manufactured and readily assembled.
Another object is to provide a control switch
10 having cooperating stationary and movable con
tact elements of novel form.
Another object is to provide a. control switch
are of like> construction and as best shown in
Figs. 6 and 'l each ofthe same is providedwith a segmental body portion I6 having a cen- l0
tr-ally disposed hub projection I1 on the base
thereof which is provided with an opening for
'Y of the aforesaid character in which the sta , receiving shaft I5. The curved face of body por
tionary and movable contact elements are made tion I6 is provided with a centrally disposed
15 up almost entirely of molded 4insulating parts v peripheral groove I8 and the side faces of said l5
j and sheet metal stampings.
‘ body portion are each similarly formed to pro
Another object is to provide a reversing switch
‘ for electric motors having a plurality of poles
each consisting of three stationary `contacts and
20 a cooperating rotatable contact element having
a plurality of pairs of 'removable bridging con
tacts associated therewith.
projections and a grooveI 2I extending between
said end projections.. Also the body portion I6 20 ‘
is formed to provide a centrally disposed tongue
projection 22 on one face thereofl and a cen
'
Various other objects and advantages of the
inventiony will hereinafter appear.
25
vide -grooved end projections Ill-I9, key por
tions 20--20 extending inwardly from said end
.
The accompanying, drawings illustrate an ein
bodimentof the Vinvention which will now be de
scribed, it being understood that the embodiment
trally disposed groove 23 _on the opposite face
thereof.
’
~
In the embodiment illustrated there are four 25
insulating sections I4 mounted upon shaft> I5,
and as shown in Fig. 1 said insulating sections
illustrated is susceptible of modification without are clamped between a nut 25 which is threaded
departing _from the _spirit and scope of the ap
on s-aid shaft adjacent the lower end thereof and
30 pended claims.
a star wheel 26 which is secured to said shaft 30
In the drawings,
_
adjacent the~ upper end thereof by a pin 21. The
_Figure 1 is a side elevational view of a control insulatingV sections I4 are arranged so that the
switch embodying the invention, parts of the tongue projection 22 and groove 23 of adjacent
switch being shown in section;
`
sections engage to prevent relative rotation of
35 Fig. 2 is a'front elevational view of the con
said sections, and as shown inFigs. l and 8 35
trol switch shown in Fig. 1, a cover associated the tongue 22 of the top insulating section en
with the enclosing casing for the switch being gages within a recess 28 in star wheel 26 to lock
removed;
f
the said insulating sections against rotation with
Figs. 3 and 4 are sectional views on lines 3-3 respect to shaft I5. The hubs I1 -of insulating
40 of Fig. 1 illustrating the switchin ofi position sections I4 are of such length that ya narrow -40
and in one of its on positions;
space is provided between the opposing faces of
` Figs. 5, 6 and 7 are perspective views of cer
adjacent end projections I9. Also the insulat
tain of the parts shown in Figs. l and Z;
ing sections I4 are assembled upon shaft I5 with
Fig. 8 is a sectional view on line 8-8 of Fig. coil springs 30 between the opposingrfaces of
46 2, and
_
Fig.` 9 is a diagrammatic view illustrating a
typical circuit arrangement for the control switch
shown in Figs. 1 and/,2L
~ .
,
l
_
The control switch' illustrated in the drawings
50 includes a rotatable contact element I having a
plurality of pairs of insulated bridging contacts
2, 3 and 4 associated therewith which- cooperate
with sets of stationary contacts 5, 6 and 1, re
spectively, carried by an insulating base 8. Said
55 parts’ are mounted within an enclosing'casing
said sections, said springs being held in position 45
by the opposing faces of the grooves 2l..
'I‘he three pairs of bridging contacts are re
movably mounted between the opposing faces-of
the four insulating sections I4, and as shown in
Fig. 7 each of said bridging contacts comprises 50
an elongated sheet metal stamping‘SI having
curved contact portions 32-32 on opposite ends
thereof and an intermediate shank '33 which is
of reduced width to provide opposing shoulders »
34--34 on opposite sides of the contact.
Also 55
2
2,1as,srs
the shank l! is provided with a 'centrally ar
ranged enlarged portion 35 having a struck out
and as shown in Fig. 5 each of the same comprises
an elongated sheet metal stamping formed to pro
vide a terminal portion 54 and a hook contact
projection Il on one face thereof. As is ap
parent from Fig. 'l the shank 3l on each of the portion 55 on one end of said terminal portion.
bridging contacts h insertable edgewise between , Insulating _base Il is provided with individual
openings 55 for receiving the several stationary _
the end projections Il-IS ot its
in
sulating sections I4 into a position wherein the contacts and as shown in Figs. 1 and 3 the rear
same clears said end projections. The contact ` face of said insulating base is 4formed to provide
can then be rotated about its longitudinal axis V-shaped projections 51 for engaging the hook
into a position wherein the shoulders 5_4 on~ op
contact portions 55 of the several stationary con
posite sides thereof interlock with the side faces tacts. 'I'he terminal portion 54 of each contact is
-of the key portions 20 on the opposing faces of bent over in the directionof its hook contact por
tion 55 to engage the front face of insulating base
the associated insulating sections I4. As is ap
parent, the contact is then locked against both
15 lateral and longitudinal movement with respect
8 and as shown in Fig. 5 said terminal portion
is provided with an opening 5B to facilitate bend 15
ing thereof. As is apparent from `the foregoing,
the stationary contacts are securely held‘within
the openings 56 in insulating base 8. The ter
to its associated insulating sections I4. Also the
contact is biased to move outwardly under the
action ot its associated spring 30, such movement
Abeing limited by engagement of its shank 3l with - minal portion 54 of each stationary contact is
provided with a tapped opening 59 for receiving a
20 the shoulders formed by end projections I9 on
the associated insulating sections. The bridg
binding screw and is also provided with a wire re-4
ing contacts are thus normally held in engage
ceiving opening 60 for receiving connections which
ment with their associated endprojections I! may be arranged as shown in Fig. 2.
_
and said projections are so designed that each
25 pair of contacts is normally held in substantial
ly parallel relation as illustrated in Fig. 3. - As
Y is apparent, thebridging contacts when mounted
as hereinbefore described are adapted to rock
As shown in Figs. 1 and 2 the front face of in
sulating base 8 is provided with horizontally ar
ranged ribs 6I ' which form horizontal wiring
passages in the spaces between the sets of sta
tionary contacts 5-6 and 6_1. Also as shown
upon the ends of their associated springs 30 and
In Figs. 1 and 2 the rear face of insulating base
30 are also held in assembled position upon insulat-'
I is provided with rearwardly projecting side ribs
62--62 and a plurality of horizontally 'arranged
ribs 63 extending between said 'side ribs, the lat
ter ribs being alined with the grooves IB in the
insulating sections I4 and acting as barriers be
tween the sets of contacts. As is apparent, the
ing sections I4 by said springs.
Shaft I5 is journaled within openings in the
top and bottom walls II and I2 o! bracket 9 and
the upper end thereof has an operating lever 31
35 flxedlthereto. As hereinbefore stated, shaft I5
has a star wheel 25 secured thereto by a pin 21
and as shown in Figs. 6 and 8 the periphery of
said star wheel is provided with notches 3B, I!
and 40 to be engaged by a roller 4I. Roller 4I
40 is rotatably mounted upon a lever 42 whichis
contact element I is movable in opposite direc
tions out oi the intermediate position shown in
Fig. 3 to bridge stationary contacts b with sta
tionary contacts a. _and c selectively.
Referring now to Fig.' 9 the above described 40
pivoted as shown at 43 upon a bracket 44 ilxed control device is shown as connected to establish
to the top wall II of frame 9. Lever 42 is biased _ reverse power connections for a three phase al
to maintain roller 4I in engagement with the ternating current motor M. A supply circuit for
periphery o! star wheel 25 by a spring 45 which is said motor is indicated by lines L1, L2 and L3, and
45 connected between the free end of said lever and a as is apparent upon movement of contact element
projection 46 on bracket 44. As is apparent, roller
I4 into a position to engage stationary contacts a
4I cooperates with notch 39 to yieldingly hold and b the supply lines L1, L2 and L3 are respec
contact element I in an intermediate position tively connected to terminals T2, T1l and T1i of
shown in Fig. 3, and said roller also cooperates the motor. However, upon movement of Contact
50 with notches 38 and 40 to- yieldingly hold said element I into a position to bridge stationary con 50
contact element in opposite extreme positions, one tacts b and c the supply lines L1, L2 and L3 are
of which is illustrated in Fig. 4.
respectively connected to terminals T3, T1 and T“
As hereinbeiore stated the pairs of bridging of the motor. It is, of course, apparent that the
contacts 2, 3 and 4 cooperate with sets of sta
above described control device may be connected
55 tionary contacts 5, 5 and 1, respectively, carried to establish reverse power connections for motors 55
by an insulating base 8. « Insulating base 8 is
- formed oi.' molded insulating material and is ar
ranged in front of contact element I. Said in
sulating base is rectangular in form and- the
upper side oi said base is provided with a pair oi
supporting lugs 48-48 which _are secured lto
bracket 44 by screws 49 while the lower side
thereof is provided with a supporting lug 50 which
is secured by a screw 5I to a bracket 52 fixed to the
lower wall I2 of trame 9.
-
The three sets oi' stationary contacts 2, 3 and
4 are horizontally alined with respect to their
cooperating pairs of stationary contacts 5, 6 and 1
and each oi’ said sets oi stationary contacts- in
70 lcludes three contacts designated by reference
characters a, b and c. Contacts b are arranged
intermediate the contacts a and c and as shown
in Fig. 2 corresponding contacts o! sets 2, 3 and
4 are vertically alined.
75
'I'he stationary contacts are of like construction,
of other types.
-
What I claim as new and desire to secure by
. Letters Patent is:
' l. In an electric switch, in combination, co
operating stationary and movable contacts, a 60
support for said movable contacts comprising
molded insulation having formed therein cavities
to,support said movable contacts and to permit
rocking movement thereof individually, and
springs mounted within said support for normal¢ 65
ly holding said movable contacts in given posi
tions and to oppose rocking movements thereof,
said movable contacts being removable from said
support by manipulation and said support being
provided with shoulders for engaging said con 70
tacts to secure the same against dislocation by
forces met with in normal operations.
2. In an electric switch, in combination, co
operating stationary and movable contacts, sup
porting means for said movable contacts com
75
2,128,373
prising molded insulating sections arranged side
by side and having formed therein comple
mentary cavities to receive and seat portions of
said movable contacts for rocking movement of
theA latter individually, and springs mounted
> 3
with shoulders to secure said contacts against
dislocation by normal forces while permitting
their ready removal by manipulation.
7. Inan electric switch, the combination with
an insulating base having an opening therein, of
between said insulating sections to yieldingly- a combined contact and terminal member com
prising a reflexed metal strip mounted within
hold said movable contacts in engagement with
their> cooperating seats and to oppose their rock
ing movements, said 'contacts being removable
10 from said support by manipulation, and said in
sulating sections being formed with shoulders
which cooperate with said-movable contacts to
prevent dislocation thereof by forces met with
in normal operations.
15
3. In combination, stationary contacts, cooper
ating movable contacts each comprising a shank
having contact portions at opposite ends there
of, a molded insulating support for said movable
said opening and having a hook contact portion
and a terminal portion engaging opposite faces
of said base, one of the faces of said insulating
base being formed to fit within said hook contact
portion.
'
,
8. In a reversing switch for electric motors, in
combination, a rotatable insulating support hav
ing a plurality of pairs of bridging contacts yield
ingly mounted thereon, each of said pairs _of
bridging contacts being arranged in opposed rela
tion on opposite sides of the axis of said support,
contacts formed to provide cavities to receive and - .and said support being rotatable in opposite di
seat the shank portions of said movable contacts rections out of an intermediate off position into
extreme on positions, a ñxed insulating base and
for rocking movement of the latter contacts in
dividually, and springs mounted within said sup
a plurality of stationary contact sets mounted
port to yieldingly hold said movable contacts in ‘upon -said base- each associated with one of said
their seats and to oppose their rocking move
ments, said movable' contacts by manipulation
being readily removable from said support and
said support being formed with shoulders secur
ing said cooperating contacts against dislocation
by forces met with in normal operations.
4. In combination, stationary contacts,b cooper
ating movable contacts each comprising a shank
and contact portions at opposite extremities of
said shank, a drum support for said movable con
tacts comprising a plurality of insulating sec
tions mounted side by side and having cooper
ating faces formed to provide cavities to receive
and seat the shanks of said movable contacts for
rocking movement of the latter individually, and
springs mounted between said sections to yield
40 ingly hold said cooperating contacts in their seats
and to oppose their rocking movements, said sec
tions providing slots enabling said contact shanks
by manipulation to be inserted in their seats and
to be removed at will, and said sections being
45 molded with shoulders securing said cooperating
contacts against dislocation by forces met with in
normal operation.
5. In combination, cooperating stationary and
movable contacts, a molded insulating support
50 for said movable contacts having formed therein
cavities to receive and seat a pair of `said movable>
~ contacts in an opposed relation for rocking move
ment of the latter individually, and a cpil spring
mounted in said support and interposed between
55 said opposed contacts to yieldingly hold both in
their seats and to oppose their rocking move
ments, said cooperating contacts being remov
able from said support by manipulation, and` said
support being _formed with -shoulders securing
said cooperating contacts against dislocation by
pairs of bridging contacts, each of said stationary
contact sets including a contact‘z to be selectively 25
engaged by its associated bridging contacts in the
extreme on positions of said support and two con
tacts arranged on opposite sides of said former
contact each to be engaged by one of its associ
ated bridging contacts in one of the extreme on 30
positions of said support.
9. In a reversing switch for electric motors, in
combination, a rotatable insulating support hav
ing a plurality of pairs of bridging contacts yield
ingly monuted thereon, each of said pairs of 35
bridging contacts being arranged in opposed rela
tion on opposite sides of theaxis of said support,
and said support being rotatable in opposite di
rections out of an intermediate oiî position into
extreme on\positions, a I‘lxed insulating base .of 40
molded> insulating material having ribs extend
ing transversely of the paths of said bridging con
tacts, and a plurality of stationary contacts car
ried by said base to cooperate with said bridging
contacts in the extreme on positions of said sup
port, each of said stationary contacts comprising
45
a refiexed metal stamping having a hook contact
portion ñtting over one of the ribs on said base
and a terminal portion extending through said
base for securement and wiring.
50
10. In a reversing switch for electric motors, in
combination, a rotatable insulating support hav
ing a plurality of pairs of bridging contacts
yieldingly mounted thereon, each of said pairs of
bridging _contacts being arranged in opposed re
lation on opposite sides of the axis of said support
and said support being rotatable in opposite di
rections out of an intermediate off position into
extreme on positions, a fixed insulating base of
molded insulating material havingone of its faces 60
formed to provide a plurality of ribs extending at
right angles to the axis of said insulating sup
port and located between each of said pairs of
bridging contacts' and a plurality oi’ projections
extending between said ribs and a plurality of 65
stationary contacts carried by said base to coop
erate withl said bridging contacts in the extreme
adjacent drum sections for seating within the' on positions of said support, each of said station
forces met with innormal operation.
6. In a movable switch element, in combina
tion, a shaft, drum sections of molded insulation
mounted on said shaft, said drum sectionsj being
65 alike and interlocking and each being molded
with cavities in opposite sides, a plurality of con
tacts each having a portion insertable between
cavity provided jointly by such adjacent drum . ary contacts comprising a reilexed metal stamp
sections, and springs mounted in cavities in said
drum -sections to bear against and to hold said
ing having a hook contact portion ñtting over
one of the projections on said base and a terminal
contacts seated, saidv contacts having rocking
movement in¿ said cavities against the bias of
ment and wiring.
said springs and said drum sections being molded
y
portion extending Jthrough said base for secure
'
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HAROLD L. MEKELBURG.
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