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Патент USA US3073936

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Jan. 15, 1963
F. N. ANDERSON EI‘AL
3,073,923
ELECTRIC SNAP-ACTION SWITCH
Filed Aug. 20, 1959
INVENTORéC
[1. 69/2“ >3 da ‘44
AME you
States
ice
3,073,923‘
Patented Jan. 15, 1963
2
1
slots formed in the opposite sectioned end wall of the
3,07 3,923
ELECTRIC SNAP-ACTION SWITCH
Fred N. Anderson and Walter L. Cherry, Jr., Highiand
Park, Ill., assignors to Cherry Electrical Products Corp”
Highland Park, Ill., a corporation of Illinois
Filed Aug. 20, 1959, Ser. No. 835,031
1 Claim. (Cl. 200—67)
Our invention relates to a new and useful improve
ment in an electric snap-action switch and more particu
larly to a type of snap-action switch in which a quick
and positive snap-action of the switch blade is attained.
The principal object of our invention is in the provision
in a switch of this character which permits a rocking
m1
housing 10. One of such slots is shown as at 29. The
base terminal plate 28 is provided with laterally extended
positioning lugs 30 and 31. The lugs 30 and 31 are in
sertable into grooves formed in opposite inner faces of
the side walls 14 and 15.
shown in FIG. 4.
One of such grooves 32 is
The base terminal plate 28 provides a pair of spaced
apart vertically extending ?ngers 33 and 34. When the
10 base terminal plate 28 is positioned in the housing 10
by reason of the lugs 30 and 31 the ?ngers 33 and 34
will be in a preselected relationship with respect to the
terminal plates 20 and 24. One side of each of the ?ngers
33 and 34 are V-notched as at 35.
Into the V-notches 35 is adapted to be seated the tapered
15
wiping break action of contacts.
bifurcated ends 36 and 37 of a switch blade 38. This
Another object of our invention is in the provision in
switch blade 38 has a slot 39 formed therein extending
a switch of this character of a cantilever contact bearing
transversely to the longitudinal length of the blade. Un
switch blade which permits a rocking-wiping break be
der such construction the blade is of a cantilever type hav~
tween contacts.
A further object of our invention is in the provision 20 ing a contact carrying member 40 at one end thereof.
The width, thickness and material of the switch blade 38
in a switch of this character of a breaking action whereby
are such that the cantilever portion thereof ?exes within
the switch contacts are self-cleaning.
its elastic limit when under the force loads produced by
Still a further object of our invention is in the pro
the associated parts within the switch.
vision in a device of this character of an arrangement of
A coil spring 41 is connected as at 42 to the blade 38.
parts whereby they may be housed within a compact
This spring 41 projects between the ?ngers 33 and 34 and
compartment without the necessity of rivets or screws.
is connected at its opposite end to a lug 42’ struck from
Other objects vwill appear hereinafter.
the base terminal plate 28.
The invention consists in the novel combination and
As viewed in FIG. 2 the lug 42 lies in a higher hori
arrangement of parts to be hereinafter described and
30
zontal
plane than does the junction of the ends 36 and
claimed.
37 of the blade 38 with the ?ngers 33 and 34. Under
The invention will be best understood by reference to
such an arrangement the spring 41 will normally cause
the accompanying drawings showing the preferred form
the
switch blade 38 to assume the position shown in
of construction, and in which:
FIG. 2, where one of the contacts of the member 40
FIG. 1 is a perspective view of our improved snap
35 will be in engagement with the contact of the terminal
action switch;
plate.
FIG. 2 is a side elevation, sectional detailed view taken
-A switch actuator is shown at 43. The actuator 43
on line 2—2 of FIG. 1;
comprises an exposed circular body portion 44 which
FIG. 3 is a side elevation, sectional detailed view simi
normally projects upwardly from the housing 10 through
lar to FIG. 2 but showing the parts in actuated position;
40 a suitable opening 45. The actuator 43 has an elongated
and
rectangular shaped lower body portion 46 which is of a
FIG. 4 is an exploded view of the parts of our inven
longitudinal length slightly greater than the distance be
tion.
tween the inner confronting faces of sides 13 and 14
‘Our invention relates to an improved snap-action
and the housing 10. To position the lower body portion
switch comprising a housing 10. The housing 10 includes
complementary sections 11 and 12 adapted to be mounted 45 46 in the housing 10 the ends of such lower body portion
46 are adapted to be slidably contained in opposite ver
together in facial abutment as seen in FIG. 1. Each
tical recesses formed in the inner faces of the side walls
side wall 13 and 14 of the respective sections 11 and 12
13 and 14. One of such recesses 47 is shown in FIGS.
is provided with complementary cavities. One of such
2, 3 and 4.
cavities is shown at 15 formed in the wall ‘14 of the sec
tion 12, FIGS. 2 and 3. It should be noted that the cavity 50 Referring to FIG. 1 there is shown a pivotal lever 48.
This lever is adapted to be yieldably depressed so as to
formed in the wall 13 of the section 11 is identical to the
slidably move the switch actuator 43 to operate the snap
cavity 15 as shown.
action switch as will be hereinafter explained. This lever
The end walls 17 and 16 of each of the sections 11 and
48 is formed from a resilient material and is substantially
12 have formed therein horizontally aligned slots 18 and
19. Inserted into the slot '18 is a terminal plate 20. This 55 Z-shaped as shown. One depending leg 49 of the lever
48 is provided with a portion 56 struck outwardly there
plate 20 adjacent its inner end is provided with laterally
from. The leg 49 is adapted to sit in a slot 51 formed
extending lugs 21 and 22. These lugs 21 and 22 are
in the top walls of each of the sections 12 and 13. When
adapted to be positioned in horizontally aligned grooves
the leg 48 is so positioned in the slot 51 the portion 50
formed in the inner opposite faces of the side walls 13
and 14. One of such grooves 23 is shown in the side 60 will frictionally engage a shoulder 52 extending trans
versely to the longitudinal length of the slot 51. Thus it
wall 14 in FIG. 4. Into this groove 23 will be positioned
the lug 21 of plate 20, while the lug 22 will be positioned
is shown that we have provided a simple yet effective
in a like groove formed in wall 13 (not shown).
means for pivotly connecting the lever 48 to the hous
A second terminal plate 24 is adapted to be positioned
ing 10.
in slot 19. This plate 24 like plate 20 is provided with 65 The opposite end of the lever 43 provides two laterally
laterally extending lugs 25 and 26. When the plate 24
extending ears 53 and 54 between which a suitable roller
is properly mounted in slot 19 the lug 25 will sit in a
groove 27 formed in the inner face of wall 14. Lug 26
of plate 24 will likewise sit in a corresponding groove
(not shown) formed in the opposite inner face of the
wall 13.
A base terminal plate 28 is positioned in confronting
55 or the like is mounted.
The underside of the medial portion of the lever 48
engages the exposed circular body portion 44 of the
switch actuator 43 so that when the lever is yieldably de
pressed it will slidably move the switch actuator 43
3,073,923
3
through the housing 10 for a purpose hereinafter made
apparent.
The actuator 43 will rest on the spring 41 when it is
in its normal inactive position. When the actuator 43 is
depressed, it will bear against and distort the spring 41.
By such distortion the tension centerline of the spring
41 is moved downwardly below the axis of the switch
.blade 38. In such new distorted position the tension of
the spring 41 has been increased and has a directional pull
upon the switch blade 38, which is opposite to its normal
directional pull and results in a downward snap move
ment of the switch blade ‘38 about its pivotal connection
to the ?ngers 33 and 34. When the depressive force of
the actuator 43 is released the spring 41 will move up_
wardly under the in?uence of the ?exural forces inherent 15
therein until it passes its coplanar position with respect
to the longitudinal plane of the switch blade 38. Thus,
the switch blade 38 will again be pivoted about its con
nection with ?ngers 33 and 34 to its normal position
shown in FIG. 2, where the spring 41 is under its mini 20
mum tension.
It should be noted, however, that by the speci?c con
struction of the switch blade 38 there is a ?exing canti
lever action in both the longitudinal and transversal axes
of the thin contact bearing member 40. The resultant 25
of said two actions produces a wiping and torsional
breaking action between mating contacts. Such action
aids the breaking of welds and promotes a fast and posi
tive break between such mating contacts. This cantilever
movement will also result in a self-cleaning action between 30
the contacts as they are forced to make and break.
It
should be noted that the rectangular shaped body portion
46 of the actuator 43 prevents such actuator 43 from be
ing displaced with respect to the housing 10.
While we have illustrated and described the preferred 35
form of construction for carrying our invention into ef
fect, this is capable of variation and modi?cation with
out, departing from the spirit of the invention. We,
therefore, do not wish to be limited to the precise details
of construction set forth, but desire to avail ourselves 40
of such variations and modi?cations as come within the
scope of the appended claim.
Having thus described our invention, what we claim
4
(e) a pivotable cantilever switch blade positioned with
in said cavity and having one end in contact with
said spaced apart arms of said terminal plate and its
opposite free end in engagement with one of the
contacts of said contact terminal plates,
(f) a lug formed on said terminal plate in spaced re
lation with respect to said arms,
(g) a spring member extending between said arms and
having one end connected to said lug and its opposite
end connected to said switch blade,
(11) an actuator substantially rectangular in cross sec
tion within said housing extending between and in
contact with the side walls thereof and transversely
of said spring member,
(i) actuator guide slots formed in the vertical side
walls of said housing for slidably receiving the op
posite edge portions of said rectangular shaped actu~
ator for guiding the reciprocal vertical movement
thereof,
(1') an opening formed in the top wall of said housing
in vertical alignment with said guide slots formed
in the side walls of said housing and through which
a reduced circular head of said actuator extends,
(1:) said actuator extending across and in contact
with said spring member adjacent the point where
said spring extends between said arms of said terminal
plate so that when said actuator is moved in a guided
path through said guide slots toward said spring
member the same will compress said switch blade to
effect a snap action movement of the cantilevered
end thereof into and from engagement with the con
tacts provided by said contact bearing terminal
plates,
(1) and a pair of locating slots formed in the side walls
of said housing beneath and in vertical alignment
with said actuator guide slots adapted to receive
positioning elements laterally extending from op
posite side edges of said terminal plate adjacent the
base of the vertically extending parallel spaced arms
for positioning said terminal member so that said
arms thereof extend in a juxtaposed vertical plane
with respect to the guided path of movement of said
actuator.
as new and desire to protect by Letters Patent is:
A snap action switch comprising
( a) a housing providing an interior cavity,
(b) a pair of contact bearing terminal plates extending
through slots formed in one end wall of said hous
ing and into said cavity,
(0) a terminal plate extending in a slot formed in the 50
opposite end Wall of the housing into said cavity,
(d) said terminal plate at its interior end portion pro
viding spaced apart parallelly extending ‘arms ex
tending at right angles with respect to said terminal
plate and in spaced parallel relation with respect to 55
the opposite side walls of said housing,
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,944,522
1,960,020
2,743,331
2,789,172
McGall _____________ __ May 22, 1934
Lauder ___...'. _______ __ Apr. 24, 1956
Happe ______________ __ Apr. 16, 1957
204,624
963,446
1,196,660
Australia ___________ __ Aug. 10, 1959
Germany ____________ __ May 9, 1957
France ______________ __ May 25, 1959
Miller ______________ __ Jan. 23, 1934
FOREIGN PATENTS
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