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Патент USA US2134541

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oct. 2'5, 193s. .y
Filed 0G11. 2l, 1936
Patented oct. 25, 193s
‘UNITED STATES» PArsN‘r 'sorrise
` l
i’ ‘Christiani Aalborg, Spring-field, Massi, assignor to
Westinghouse Electric & Manufacturing Com
pany,’East Pittsburgh, Pa., a corporation of
1936,- fserialï No. 106,785
Application OctoberV 241,
' s claims.
(c1. zooi-'sei` ,
tions, one clamp portion 23 adapted to receive a
conductor ‘wire >25,- and the other portion 21
adapted to receive the insulation 29 surrounding
My invention relates' generally to switch mech
anisms and is directed more particularly to switch
mechanismsin which movement of an operating
the wire.
A spindle 3l is mounted on the base approxi
member causes a blade of the switch to be rotated
‘1 over a series of stationary switch contacts with a
snap action.
matelyat the center of the arc of the circle along
Which the contacts are mounted. The spindle is
' `An object of the invention is to provide an im
providedwith a reduced portion 33 which passes
p-roved switch mechanism of this general type.
through an opening provided in the base, and has
` »Another object of the invention is to provide an
its end spun over against a washer 35 on the 10>
- under side of the‘base. The latch plate 9 is pro
10'" improved switch mechanism of vthe snap-acting
type which is of simple and rugged construction,
which requires a minimum number of parts, "and
vided with an opening for. receiving the reduced
portion 33 of ’the-spindle 3l, so that the _latch
plate is held in rigid position between the shoul
der ,onthe' spindle‘and vthe base 5. The latch
plate 9,1 has a segmental portion 31 provided with
a flange 39. The ilange 39 has a plurality of
which can be manufactured at a relatively low‘
115: The novel features that'l consider character
` istic of my invention are set forth with particular-`
ity in the appended claims. The invention itself, spaced notches 4I, one for each contact. f Each
however, vboth‘as to structure and operation, to
notch is located at a point diametrically opposite
gether Íwith additional objects and advantages its coresponding stationary contact. The latch 20
thereof, will best be understood from >the ,follow
ing detailed description of a specific embodiment
plate 9 has an extension 43 provided with an
When read in connection with the-accompanying
nal stud 45. » The terminal stud passes through
opening at the end thereof for receiving a termi
l drawing, in which:
a terminal connector 41 similarto the connectors
I1. The terminal connector 41 .is adapted to re 25
ceive a live conductor 49 ‘provided with an in
` Figure 1 is a plan view of a snap switch em-f
bodying- the features` of my invention with they
‘ operating member _thereof removed;
sulating sheath 5I.
`Fig. 2 is a vertical sectional View of the snap
theline 1li-_II of Fig. 1;
The terminal connector 41, terminal stud 45,
and extension 43 constitute a means for conduct
switch illustrated in Fig. 1 with ‘the operating`
membermounted in position thereon, taken on
ing current from the live conductor 49 to a switch 30
blade, which will now be described. The switchv
' Fig. 3 is a top plan View of the operating mem- f blade ll is constructed of suitable resilient con
` ber`for the snap switch illustrated in Figs. 1 and ducting material and has a longitudinal opening
2; and
Fig. 4 is a front elevational view of the operat
- ing member illustrated in’Fig. 3.
Referring no-w to the drawing, the structure of
the \ snap switch embodying the features of my
invention consists in general of ‘a base 5, a plural
ity of stationary contacts 1, a notched latch p_late
40 9, a >switch bladel I, an actuating spring
a manually controlled‘operating member I5.v
The base 5, which is constructed of >suitable in
sulating material, has disposed in .openings’there
a plurality of spaced contacts 1 ‘arranged in an
45 arcfof a circle.` Each contact’ is provided with a
terminal connector I1, which has an 'opening pro
vided therein for receiving a reduced portion i9
of the contact member 1. The contactl members
and terminal connectors are each ’secured to the
base by `means of the reduced portion 19 thereof`
which passes through the opening provided in the
base, and has its end portion spun over against a'
53 adjacent the center thereof< for receiving the
spindle 3|. The forward end of theswitch blade
l I is provided with a hanged head 55 adapted to*l
engage the stationary contacts 1. The switch
blade has a rearwardly extending portion 51 pro
vided with a latch projection 59 which is adapted
to be positioned in Vthe‘notches 4l of the latch 40
plate 9. A pair of spaced projections Bü extend
upwardly from‘one edge of the switch blade Il
adjacent the slotted opening 53, and a second pair- Á
of similarly spaced projections 3i extend upward
ly from the opposite edge of the switch blade ad
jacent the slotted opening. The switch blade is
mounted on the spindle by means of the slotted
opening 53 and is held in spaced relation from
--the base 5 by means of a spacer washer 63. The
slot 53 permits the bladeY Il to have a limited 50
sliding' movement and to rotate for successive
engagement with the spaced contacts 1.
’Spring means i3 is coiled aboutl the spindle and
washer 21| ‘positioned between-the end of there
the free ends 65 thereof extend'> through> the space
duoed- portion and-¿the base. `Each terminal con-Vv
nector; His; provided `withffapair of clampfpor-U between theprojections 59 andßi, as shown‘in
Fig. 1. The normal tension of the spring causes
its projecting ends 65 to engage the rearward pro
jections 6€) and 6I, so as to bias the blade in a
longitudinal direction to cause the latch projec
tion 59 to engage in one of the notches 4I so as
to lock the switch blade I I whenever it engages
' any of the stationary contacts -I.
engages in the notch 4I corresponding to the
lowermost contact. The blade is now securely
locked in position on the lowermost Contact 'I.
If it is desired to rotate the blade back to the
position shown in Fig. 1 in which it engages the
center stationary contact 'I, the operating mem
ber is moved in a counter-clockwise direction
and av reverse action takes place. The projection
T'I‘of the flange 'I5 engages andr moves the lower
An operating member I5 of moldedî insulating
material is rotatably mountedV on the spindle 3‘I
10 and is held thereon by means of a split'ring 61
so that the spring I3 is compressed to press the‘ i free end 65 of the spring I3 and introduces an 10
additional tension therein. After the spring has
switch blade I I into engagement with theY con»
been. tensioned sufficiently, further movement
tacts ‘I and to hold the blade against the causes
the lower free end of the spring to engage
spacer 63.
the' forward' projection IìI and move the blade
The operating member I5 is of segmental‘shape longitudinally to: Withdraw the latch projection
and has a hub portion 69 formed integral there
with on the under side thereof. The hub portion 59’ from the,- notch 4I in which it is engaged.
is provided with a centrally di‘sposedlv opening 'FIT The blade is now rotated with a snap action by
the'tension of the'spri-ng I3 into engagement with
by means of which the operating member is ro
tatably mounted on the spindle 3|. The centrally the center stationary contact 'I. Further rota
disposed opening 'II- o'pens in-to a- chamber 13€ tion of the-switch blade I I is prevented by reason
at the top of the operating member for receiving of the upper. free end (i5-ofl the spring engaging
the split ring 67. The under side' of the hub B9 the upper end. of» theflange 15». The normalV ten
sion of. the spring: 65.» now moves‘the switch blade
has a semi-circular flange 'I5 formed integralv longitudinally
so that the latch projection- en
therewith. One end of. the ilange 751 has a de
4Ir corresponding to the cen-A 25
pending portion 'I1 adapted» toengage the lower
ter contact 'I. It will be noted that the engage
free end 65 of the coil spring> I»3- whenr the'operat
ment-of either end of the spring I-3 with the for
ing member is rotated in a- counter-clockwise di
ward. projections of the pairs 60 and 6I causes
rection. The other end of the ñange'l5 is adapted
movement of the switch blade II so as
> to engage the upper free endy 65 of the spring It!to release the projection 59 from the notch in
when the operating member is- rotated' in. a clock
wise direction. A knob projection 'I9 is formedv which it is engaged. The rearward projections
integral` with the operating» member adjacent the of the pairs BEL and- 6I form the means by Which
edge thereof by mea-nsf of which the operating the bladeïis rotated by the tension of the spring
I3, and in addition form the means whereby the
member may be manually rotated».Á The operat
normal tension of thejspring` causes` longitudinal 35.
ingy member may be constructed of any suitable
movement of< the blade to latch engaging posi
insulating material.
tion; v
The operation of the structure described above
It is evident without further explanation that
will now be briefly explained. Let itV be» assumed
the operating member Iäiisrotated far enoughl
that it is desired to move- the> switch'. blade from
the position shown in Fig. 1 intoV engagement in either. direction,` the blade will be- rotated in
with the next lower contact. It will be- noted- the manner described from contact toy contact
that in the position of the parts- illustrated in so that the amount of movement of the operating
member I5 determines the amount of movement
Fig. 1 the ends-of the spring I3 engage the' rear
of the switch~ blade I'I-.
45 ward projections 60 and 6 I to' hold the latch
projection 59 in one of the notches 4I so that
the blade II is held in locked position on the
center stationary contact 1f. The operator grasps
the knob, ‘IS- and rotates the operating member in
50 a clockwisey direction about thespindle 3'I‘. The
upper end of the iiange ‘I5 (see Fig. 1~) engages
andA moves the upper freel end 65 of the*y spring
I 3» and introduces an additional tension. in' said
spring. After a slight rotation of- the operating
j member I5» in which suñìcient tension is intro
duced in thev spring means, the end of the flangeî
causes the free upper end 65 ofv they spring to<
engage the forwardl projection 60. A slight addi
tional- rotation of the operatingk member causes
the upper free end of the springy to move the
forward projection 60 to slide the blade longi
tudinally in theforward direction soV as to'- with
draw the latch projection 59-from its engagement
in the notch 4-I. The switch blade is now free
to- rotate, and' the increased tension'of the spring
causes the lower free end 65 to exert considerable
force on the'rear projection BI, thus causing the
blade to. rotate with a snap action, so as to en
gage the lowermost stationary contact. 1. Fur
ther movement of the blade is prevented by
reason of the lower free end 65 of thel spring
engaging the depending projectionY ‘I1 oi’A the
flange ‘I5 upon the operating member I5. At this
time, the normal tension of the spring moves the
blade longitudinally so that the. latchV projection
The normal` or open circuit position of the
switch blade IfI» is that position in- which it en
gages the terminal stud 45. vIf desired, however,
an additionall blank Contact and a notch therefor
in the latch plate- (not shown) may be providedy
to be engaged by the switch blade in the'normal
or open. circuit position thereof.
The number of stationary contacts and coop.
erating .notches in the latch plate may be in
creasedin number tozmeet the particular require
ments. Only three-have been illustrated in order
to simplify the drawing.
'Iîheswitch mechanism described herein may,
for example,> be- employed to control the motor
ofV an. electric food mixing.` device, or may be em
ployedy to control. any electrical device with which 60
it is desirable or necessary to use a multi-contact
switch having a snap action.
From the foregoing description, it is evident
that the invention provides a novel form of snap
switch in which a single spring serves to rotatably
couple the switch blade with the manually con
trolled operating member, and also servesto lock
or unlockA the switch blade in or from engagement
with any of the contacts. The spri-ng also func
tions to rotate the blade with a snap action and
presses the blade into engagement with the con
While a particular embodiment of the inven-tion has been shown, it is obvious that various
changesma'y be made in the structure Without
departing Í from'.` the spirit ~ "ói theA invention. ' ‘ ForV
toI .lockl said» ‘bladei‘wl'ieneverï it’ engages anyY of '
example, »the shape of f the f manually f controlled"v
blade in a’longitudinalâ' direction .to .cause said
operating ‘member ïma'y» bev ‘changed lf'to‘ suit-par
ticular requirements. `A 1 pair-‘of `depending `pro
jections of different length'l’m'ay be""substitutedA
for the semi-Ácircularilange 15 and the _depend
said Vconta'cts,.lspr`ing means normallyurging said
member to »engagelwithï said stops, and for rotat
ing'said blade, means for ltensioning said spring
means,- and means ‘carried byfsaid lblade engaged
byïlsaid‘springl means ‘when saidl spring means is
ing .projectionH 1-1.'-' Likewise; various other means suiñciently tensioned to rotate the blade with a
for coupling the spring to the operating mem
snap action for moving said blade longitudinally
ber may be substituted for thespeciñc coupling Vto withdraw said >member from the stop with 10
10 means illustrated. For example, the free ends which it is engaged to- free said blade for` rota
of the spring may pass through slots in up
tion by said spring means.
wardly extending projection provided on oppo
4. In a switch mechanism, the combination of
site sides of the switch blade VI l. Various other a base provided with spaced contacts insulated ,
forms of spring means. may be `used in place of therefrom and with corresponding spaced stops 15
the coil spring illustrated. -For example, a flat one for each contact, a spindle, a switch blade
175 `spring
strip may be held in tension between the . mounted on said spindle for limited longitudinal
spindle 3| and the _rearward projections on the , movement and for rotation to successively engage
switch blade.
While a preferred form of the invention has
20 been illustrated,
it is obvious that various
changes and modifications, in addition to those
suggested above, may be made without depart
ing from the spirit of the invention as set forth
in the following claims.
I claim as rnyinvention:
1. A snap switch comprising a base provided
with spaced contacts insulated therefrom, a spin
dle‘carried by said base, a latch plate carried
by said base provided with spaced notches one
for each contact, a switch blade rotatably mount
ed on said spindle for cooperative engagement
with said contacts, a latch piece carried by said
i blade for engagement in said notches, said blade
`having limited longitudinal movement, a pair
35 of spaced projections extending from each edge
of said blade adjacent said spindle, a spring
lmeans held in tension between saidV spindle and
two opposite projections for biasing said blade
and latch piece longitudinally in a direction to
40 engage said latch piece in said notches, an oper
ating member rotatable» on‘said spindle provided
with projections on opposite sides of said spindle
for engaging and moving either end of said spring
said contacts, spaced projections carried. by said
blade at each side of said spindle, a member car
ried by said blade for engaging said stops to lock
said blade onA any one of said contacts, a spring
means for rotating said blade, normally coop
erating with said spindle and one pair of said
projections for biasing said. blade in a longi 25
tudinal direction to engage said member with
said stops, an operating member having means
for moving either end of said spring means to
tension the same and for causing >said spring
means when it has been sufficiently tensioned to
engage one of the other pair of projections to
move said blade longitudinally to withdraw said
member from the stop with which it is engaged
whereby said blade is freed for rotation by said
>spring means.
5. In a switch mechanism, the combination of
spaced contacts, a spindle, 'a latch plate provided
with ,spaced notches one for each contact, aV
switch blade mounted on 'said spindle for limited
longitudinal movement and for'rotation to en 40
gage said contacts, a member carried by said
blade for engagement in said notches to lock
means to further> tension the same and for caus
ing said spring means to engage and move either
of the remaining projectionsto move said blade
longitudinally for withdrawing said latch piece
from said 'notches when said spring has been
tensioned sufficiently to rotate saidblade with
said blade Whenever it engages any one of said
contacts, a pair oi’> projections carried by the
blade, spring means held in tension between said 4.5
spindle and said projections for normally urging
said blade in a longitudinal direction to cause
engagement of said member with said notches,
and for rotating said blade when said spring
means is tensioned, a second pair of projections 50
carried by said blade adapted to'be engaged by
said spring means when suñiciently tensioned to
cause said blade to move longitudinally to with
draw said member from the notch in which it is
engaged, and operating means for tensioning said 55
engage said contacts and provided with a latch spring means.
piece positionable in said notches to lock said '
6. In a switch mechanism, the combination
blade in engagement with any of said contacts, of a base provided with spaced contacts and with
said blade having vlimited longitudinal >move
corresponding spaced stops, one for each con
a snap action.
2.7A snap
Vwith spaced
plurality of
mounted on
switch comprising a base provided
contacts and a latch plate having a
spaced notches, a switch blade
said base for rotation to successively
ment to permit withdrawal of said latch piece
-from said notches, a spring means vfor, rotating
said blade and for normally biasing said blade
to cause engagement of said latch piece in said
tact, a spindle, a switch blade mounted on said 60
spindle for limited longitudinal movement and
for rotation to engage said contacts, a locking
projection carried by said blade for engaging
notches, an operating member for- further ten- Y with said stops to lock said blade on any one of
sioning said spring means, said spring means
65 when sufficiently tensionedto rotate said blade
said contacts, spaced projections carried by saidV
blade at each side of said spindle, a spring coiled
with a snap action engaginga means provided ` about said spindle and having its- ends disposedv
on said blade to move the same longitudinally between the projections on each side of the spin
to withdraw said latch `piece .from said notches to , dle, said spring being normally held in tension
allow rotation of said blade.
between said spindle and two of said projections
3. In a switch mechanism, the combination
so’as to bias said blade in a >longitudinal `direc
70 of a base provided with spaced contacts and cor
tio-n to engage said locking projection with said
responding stops, a switch blade mounted on stops, a rotatable operating member having
said >base for limited sliding movement and for means for engaging and moving either end of
rotation to engage said contacts, a member car
said spring tofurther tension the same and cause 75
ried by said blade for engagement with said stops
said' spring; Whenrit has: been'suiäîcientlyw ten,
sioned, to, engage- one of. the other two. projec
tions to; move saidi blade longitudinally andl With
drawV said¿ locking projection from the stopv with
e whiohvit' is engagedf to cause said»y spring through
the engagementof` its-other end` with one of saidl
blade .withi a. snapA action in the direction of ro
tation of; said.’r operating member,y said means of
said operating; member limiting rotation of said
blade an amount correspondingV to the amount of
rotationof said operating> member.
first-mentioned- two; projections to rotate said`
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