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Патент USA US3098915

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July 23, 1963
3,098,905
F. N. ANDERSQN
SNAP-ACTION SWITCH
Filed 001:. 20, 1961
INVENTOR.
i250 M/YIVDEKSO/V '
BY
3,@8,%5
Patented July 23, 1963
2
33%,965
SNAP-ACTEGN SWITCH
Fred N. Anderson, Highland Park, llh, assignor to Cherry
Electrical Products Corps, Highland Park, 1th, a cor
poration of Illinois
Filed Get. 20, 1961, Ser. No. 146,6tl8
4 Qlairns. (Ci. zoo-s7)
shown, described, and claimed in my co-pending applica
tion Serial No. 125,776, dated July 21, 1961.
My improved snap action switch includes a housing
generally shown as at 10. This housing is provided with a
complementary side cover 11 Within the housing 10‘ there
is a hollowed out cavity generally indicated as at 12. The
side cover 11 is provided with a complementary partial
cavity indicated ‘as at 13. Correctly positioned within the
My invention relates to a new and useful improvement
cavities Hand ‘13 of the housing to and cover 11 is the
in a snap action switch and more particularly to a. switch 10 switch mechanism of this invention.
having a movable blade that by means of an over-centering
The switch mechanism includes a pair of spaced apart
device is moved with a snap action into and out of circuit
?xed contact bearing terminals 14 and 14’. These termi
making contact.
nals 14 and 14’ extend through slots formed in the end
A particular ‘object of my invention is in the provision
wall 15 of the housing 10‘. Each of the terminals 14 and
in a snap action switch of this character of an actuator 15 14' have their corresponding opposite edges notched as
that has a positive path to travel, and which engages a
at 16 and 17 as viewed in FIG. 5. The notches formed
tension member iat a point immediately adjacent to the
in the one corresponding edge of each of the terminals
pivotal connection of the movable switch blade ‘and its
14- and 14/ ?t into the slots formed in the end wall 15 of
supporting member.
the housing 10. The notches 17 formed in the correspond
A further object of this invention is in the provision 20 ing opposite edges of the terminals 14 and 14' receive the
in a snap action switch of this character of a movable
switch blade that is formed so as to provide a greater
end wall 18 of the cover 11. The ends of the terminals
14 and 14’ which are positioned within the cavities 12 and
13 of the body 10‘ and cover 11 are generally T-shaped
as at 19. The T-shaped ends 19‘ of the terminals 14 and
contact area with its terminal pivot post thus assuring a
greater current conductive connection therewith.
A still further object Of this invention is in the provi 25 :14’ providing laterally extending lugs 19’ which ?t into
sion in a snap action switch of this character of a movable
horizontally aligned recesses 2i} and 21 formed in the
blade tensioning member in the form of a coil spring,
walls of the cavities 12 and 13, respectively. It is thus
wherein the coils of such spring are disposed entirely to
readily seen that between the T-shaped ends 19‘ and the
one side of the terminal pivot post, with the coils of the
side notches 16 and 17 the terminals 114 and 14' will be
spring in the path of the switch actuator. The coil spring,
correctly positioned within the switch casing.
as a tensioning member for the movable blade, is provided
Each of the terminals 14 and 14' provide spaced apart
with an elongated neck terminating into a hook which
confronting contacts 22 and 23. A terminal pivot post
by the construction of the movable blade has a positive
24 is provided as part of the switch mechanism and it
connection therewith.
extends into the cavity 12 of the housing 10 through the
Another important object of my invention is in the 35 bottom wall 25 thereof. The terminal pivot post 24, like
provision in a switch of this character of an arrangement
the terminals 14 and ‘14’ has its opposite edges notched
of parts which properly locate the tension member in a
as at 26 and 27, with the notch 26 positioned in a slot 28
pre-determined position with respect to the movable switch
formed in the bottom wall 25' of the housing 10, and the
blade and the switch blade actuator.
notch 27 formed to receive the bottom wall 29 of the
40
Yet another object of my invention is in the provision
cover 11.
in a switch of this character of a cantilever movable
The inner confronting walls of the cavities 12 and 13
switch blade that will move relative to -a stationary contact
are each provided with aligned recesses 311 and 31
with a rocking motion which will effect a wiping action
which are adapted to receive oppositely extending lugs
between electrical contacts.
32 carried Iby the terminal pivot post 24, only one of
45
Yet another object of my invention is in the provision
such lugs 32 being shown. The end of the terminal
in a switch of this character of an arrangement of parts
pivot post 24
that is economical in manufacture, simple in assembling,
the switch is
and positive in its operation.
post arms 33
‘Other objects will appear hereinafter.
50 corresponding
The invention consists in the novel combination and
arrangement of parts to be hereinafter described and
claimed.
The invention will be best understood by reference to
which is positioned within the casing of
bifurcated to provide spaced apart pivot
and 34‘.
One face as well as opposite
edges of each of the posts 33 and 34 are
provided with V-notches 35 as seen in FIG. 5.
Formed from a spring material is a substantially ?at
switch blade 36. The body of the switch Iblade 36 is
divided into equal portions by a partially extending
the accompanying drawings showing the preferred form 55 narrow slot 37. The free ends of these equal portions
of construction, and in which:
FIG. 1 is a perspective view of my improved snap
action switch.
FIG. 2 is a side elevational view of my switch with
of the isody of the switch blade 36 are provided with
corresponding shoulders 38. The arrangement is such
that the shoulders 38 as well as the ends 39 of the equal
portions of the ‘body of the movable switch blade 36 on
the cover removed.
60 either side of the slot 37 are positioned into pivotal
'FIG. 3 is a side elevational view of the interior surface
contact with the V-notches 35 formed in the faces and
of the cover for the snap action switch.
opposite sides of the pivot posts 33‘ and 34.
FIG. 4 is aside elevational view of my switch showing
The switch blade 36 has formed therein a diagonal
the parts thereof in ‘an ‘actuated position.
slot 40‘ which extends from one longitudinal edge of the
FIG. 5 is a perspective view of the internal parts of 65 blade 36 in the direction of and terminates short of the
my improved snap action switch.
slot 37. However, the slot 40 terminates at a point
FIG. 6 is a detailed sectional view taken on line 2-2
adjacent to and in the plane of the slot 37. By the slot
of FIG. 2, and
40 a cantilever type blade is formed which has a resilient
FIG. 7 is a fragmentary perspective view of a portion
end 41 which carries thereon a contact ‘42. The switch
of the cover.
blade 36 is held in contact with the pivot posts 33' and
70
This application is a continuation-impart of and con
34- under tension by a tension member in the form of
stitutes an improvement upon the snap action switch
a coil spring 43. One end of the coil spring provides an
3,098,905
elongated neck 44 which terminates into a book 45
which extends through and is in contact with the base
of the diagonal slot ‘40. The opposite end of the coil
spring 43 provides a reversely formed hook member 46
which is adapted to be hooked upon a spring pin 47. It
should be noted that when the heretofore described parts
are assembled within the casing of the switch the con
possible to the pivotal connection of the blade 36 with
the pivot posts 33 and 34‘, thus reducing the amount of
deformation of the spring necessary to actuate the blade.
volutions of the coil spring lie entirely to one side of
the pivot posts 33 and 34 directly in line of a switch
This also has a direct bearing on the amount of external
pressure required to cause movement of the actuator
A positive action of the blade 36 results from the fact
that the tension member 43 is actuated through the pres
sure of the foot 65 of the switch actuator 48 engaging
a portion of the tension member 43 at a point as close as
actuator 48. The long neck 4A- of the tension member 10 relative to the spring.
43 extends between the pivot posts 33 and 34 and lies
In FIG. 3 it will be noted that adjacent the corner
freely within the con?nes of the slot 37 formed in the
of the cover 11 de?ned by the walls 18 and 29 thereof
blade 36.
there is formed on the exposed surface a laterally ex
The opposite end wall 49 of the body It} is provided
tending rib: ~66. This rib 65 is adapted to sit in a mar
with a notched out portion 5%‘ which is of a depth less 15 'ginal channel 67 formed in the confronting exposed
than the cavity 12 formed in the body It). The base
of the notched-out portion 501 is provided with a cir~
cular pit 51 in which is seated one end of the spring
surface of the body 1h. The marginal rib 6:5 is inter
rupted by a passage ‘68 which receives the notched out
portion 17 of the ?xed terminal 14’ when the cover is
pin 47. The cover 11 adjacent one end 52 thereof is
mounted in a closing position upon the body 10.
provided with a corresponding aligned recess 53 into 20
From the foregoing construction it is apparent that I
which freely projects the opposite end of the spring pin
provided a movable switch blade 36 which has a greater
47 when the cover 11 is mounted on the body It), as
area of current conductive contact with the pivot post
shown in FIG. 1.
arms 33 and 34 of the ?xed terminal 24. This by reason
The end 52 of the cover 11 provides a lateral exten
of the requirement of only a very narrow slot 37 formed
sion 54 which provides a rear wall for the notched-out 25 in the blade 36 in which is positioned the thin elongated
portion 50 of the end wall ‘49 of the body It) when the
neck 4!:- of the tension member 4-3. This neck 44 also
cover is mounted thereon. The cover 11 adjacent the
permits the pivot post arms 33 and 34 to be of a size pre
recess 53 inwardly of the lateral extension 54 is pro
senting a greater pivotal contact area with the movable
vided with spaced apart bosses 55. These bosses 55
blade 36. The diagonal slot 44} assures proper position
project inwardly of the notched-out portion 5t) and lie 30 ing of the hook 45 of the tension member 43 to the blade
above and below the spring pin 47 and maintain the
36 as well as forming a cantilever end 41 for the movable
hook 46 of the tension member 43 on the spring pin 47.
blade.
The cover 11 on its inner face adjacent the bosses
By incorporating confronting and cooperating connect
55 provides an elongated extending lug 56. This lug
ing parts on the body 10 and cover II, -I have provided
56 is adapted to lie against one side of the coils of the 35 a switch casing in which the switch mechanism may be
readily and simply assembled. By reversing the hook
tension member 43 so as to maintain the same in a pre
determined position within the casing of the switch.
members 45 and 46 of the tensioning member 43, I have
The lug 56 is elongated so that it will always have a
provided a pivoting connection between the blade 36 and
surface in abutment with the coils of the spring even
the tensioning member 43 which increases the life of the
as the same is moved by the actuator 48 into the posi 40 tensioning member 43 and prevents the same from trans
tion shown in FIG. 4.
mitting a bending motion on to either end of the tension
The body 10 in the top wall thereof is provided with
member as.
a passage 5*?’ which communicates with the cavity 12.
While I have illustrated and described the preferred
Within the passage 57 is slidably projected the stem
form of construction for carrying my invention into ef
portion 58 of the switch actuator 48. The actuator 43 45 fect, this is capable of variation and modi?cation without
is formed in a substantially L-shape with the lower corner
departing from the spirit of the invention. I, therefore,
do not wish to be limited to the precise details of con
thereof notched out as at 59, and with a portion 60 of
the base leg thereof extending in a depending plane with
struction set forth, but desire to avail myself of such
respect thereto.
variations and modi?cations as come within the scope of
A laterally extending ‘guide 61 is carried by the de 50 the appended claims.
pending portion 60 as seen in FIG. 5. This guide 61
Having thus described my invention, what I claim as
is adapted to ride in a groove 62. formed in the side wall
new and desire to protect by Letters Patent is:
of the body *10. The L-shaped actuator 58 provides a
1. A snap-action switch housing, having a body nor
shoulder 63 which in normal position is in contact with
mally open at one side and a cover therefor, with said
a portion of the top wall '64 of the body '10 which de 55 body and cover providing an interior cavity containing a
snap-acting mechanism including
?nes the cavity =12. This shoulder 63 prevents outward
movement of the actuator 4-8 from within the cavity 12
of the body 10.
By reason of the actuator 48 being L-shaped, an off
set foot portion ‘65 thereof, will engage the tension spring
43 at a point adjacent the bifurcated ends of the pivot
(a) an elongated coil spring,
(b) said coil spring having one end connected to a
movable switch blade and its opposite end attached
to a supporting means carried by said housing,
(6) a supporting means extending transversely be
posts 33 and 34 as seen in FIGS. 2 and 4, and thus be
tween said body and said cover and upon which one
laterally distant from the long axis of movement of such
end of said coil spring is hooked,
(d) said housing providing a compartment for said
supporting means,
(e) said compartment comprising a notched-out open
actuator, for a purpose hereinafter explained.
When the actuator 48 moves inwardly of the body 10 65
in its controlled path, it will depress the tension member
43 below the point of pivotal connection between the
blade 36 and the pivot posts 33‘ and 34, creating in
ing formed in one end wall of said body of a depth
less than said cavity formed therein,
creased tension in the blade 36 causing the same to move
(f) and means carried by a corresponding end wall
with a snap action into the position shown in FIG. 4 70
where the contact 42 of the blade 36 engages contact 23
of the ?xed terminal member 14. As the blade 35 is
of a cantilever con?guration the contact 42. will actually
of said cover for closing said notched-out opening
and for positioning the hooked end of said coil spring
upon said supporting means for maintaining said
coil spring in a predetermined longitudinal plane
with respect to the movable switch blade.
2. A snap-action switch housing as de?ned by claim 1
rock on the contact 22. before the blade 36 moves with
a snap action into its actuated position.
75
3,098,905
5
6
wherein said means for closing said notched-out open
ing comprises laterally extending projections integrally
formed on said cover for insertion into said notched-out
opening on three sides of said supporting means for
maintaining said coil spring thereon.
3. A snap-action switch housing as de?ned by claim 1
wherein said supporting means comprises a pin projecting
laterally with respect to said body and said cover and
upon which is hooked one end of said coil spring, one
end of said pin centered in said compartment provided 10
by said body and having its opposite end positioned cen
trally with respect to said closing means provided by said
(e) said compartment comprising a notched-out open
ing formed in one end wall of said body of a depth
less than said cavity formed therein,
(f) and means carried by a corresponding end wall of
said cover for closing said notched-out opening and
for positioning the hooked end of said coil spring
upon said pin for maintaining said coil spring in a
predetermined longitudinal plane with respect to the
movable switch blade,
(g) said closing means comprising laterally extending
projections integrally formed on said cover for in
sertion into said notched-out opening on three sides
of said pin for maintaining said coil spring thereon.
cover.
4. A snap-action switch housing, having a body nor
mally open at one side and a cover therefor, with said 15
body and cover providing an interior cavity containing a
snap-acting mechanism including
'
(a) an elongated coil spring,
(b) said coil spring having one end connected to a
movable switch blade and its opposite end attached 20
to a pin carried by said housing,
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,944,522
2,404,874
2,592,660
2,789,172
Happe _______________ .__ Apr. 16, 1957
1,196,660
204,624
France _____________ __ May 25, 1959
Austria _____________ __ Aug. 10, 1959
(0) a pin extending transversely between said body
and said cover and upon which one end of said coil
spring is hooked,
(d) said housing providing a compartment for said pin, 25
Miller et a1. __________ __ Jan. 23, 1934
Wohl ________________ __ July 30, 1946
\Crumley _____________ __ Apr. 15, 1952
FOREIGN PATENTS
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