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Патент USA US3053961

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Sept. 11, 1962
M. J. DOBES
3,053,950
SNAP-ACTING swrrcn
Filed Aug. 15, 1959
A.51.,
3 Sheets-Sheet 1
Sept. 11, 1962
M. J. DOBES
3,053,950
SNAP-ACTING SWITCH
Filed Aug. 13, 1959
\
3 Sheets-Sheet 2
M
“
E3/lQ/MISQ‘Z4 m\ icylzs?ugmgl lag/~34 MICHAEL J.D_OBES
I03 I09
_
FIG. 4
(‘1M
m.
Sept. 11, 1962
M. J. DO‘BES'
3,053,950
SNAP-ACTING SWITCH
Filed Aug. 13, 1959
5 Sheets-Sheet 5
1429
I45
-
INVENTOR.
MICHAEL J. DOSES
81,414,147 $1 71141
I
(war.
United States Patent 0 "
cc
3,653,950
Patented Sept. 11, 1962
2
1
3,€@53,959
FIGURES 9 and 10 are partial top views of the switch
contacts corresponding to FIGURES 7 and 8, respectively.
Michael J. Dobes, ?eveiand Heights, Ohio, assignor to
been illustrated as a double-throw switch and used as a
SNAR-AQITING SWITCH
The National Acme Company, a corporation of Ohio
Filed Aug. 13, 1959, Ser. No. 833,425
8 Claims. (£1. 2118-78)
The snap-acting switch of the present invention has
precision-limit switch. The switch may be readily con
nected for use either as a normally closed or a normally
open type or as a combination of both.
FIGURE 1 shows an exploded isometric View of the
entire snap switch 10 which includes generally a main
duty type.
10 housing 11 having open upper and lower ends which are
adapted to be closed by top and bottom covers 12 and 13
This application is a continuation in part of my co
The invention relates in general to electrical switches
and more particularly to snap-acting switches of the heavy
pending application Serial No. 722,318, ?led March 18,
sealed by gaskets, not shown for clarity. Screws main
An interme
diate wall 14 divides the housing 11 into top and bottom
cluding both slow-acting and snap-acting and in general 15 compartments 15 and 19, respectively, and forms a bot
tom wall for each such compartment. Located at one end
slow-acting switches require fewer parts and are thus easier
of the housing 11 is a cam mechanism 16 which includes
to manufacture and in general more reliable. However,
?rst and second parts 17 and 18, respectively. The cam
such switches are subject to considerable pitting and burn
mechanism 16 is rotatively carried by a shaft 21 which is
ing of the contacts because of the slow make and break
of the contacts and; hence, such switches generally are 20 journalled in one end of the housing 11. The cam ?rst
part 16 includes a cam member 21} provided with ?rst
not usable on anything but light current applications such
and second cam portions or low and high surface portions
as control circuits. For heavy duty applications wherein
23 and 24, respectively. First and second crossed slots
large currents are to be switched, the snap-acting variety
27 and 28, respectively, are provided in the end of the sec
of switch is practically mandatory. Such switches have
in the past had a poorer reputation for reliability than the 25 ond part 18. The ?rst part 17 includes raised wall por
tions 34; which are adapted to reside in either one of the
slow-acting type because of their greater number of parts
slots 27 or 28 to non-rotatively connect together the ?rst
and the operating characteristics during the life of the
1958, now Patent No. 2,958,747, issued November 1, 1960.
The prior art has known many forms of switches in
tain the covers in place upon the housing.
and second parts 17 and 18 of the cam mechanism 16.
A cam mechanism return torsion spring 36 surrounds the
second part 18 and has two ends engaging either side of
hence, to try to use such snap-acting switches as precision
a projection 38 formed as an integral part of the housing
limit switches has generally been unsatisfactory.
11. The second part 18 of the cam mechanism is provided
Accordingly, an object of the invention is to provide a
with a ?nger 39 which extends between the two ends of
snap-acting precision-limit switch of the heavy duty type.
the spring 36. This construction permits the cam mecha
Another object of the invention is to provide a snap
acting switch which will handle heavy currents and which 35 nism to turn in either direction with the spring 36 exert
ing a returning force acting against the turning force, so
may be precisely controlled as to the operating point and
switch has been inconsistent.
The wear on the several
parts has caused them to change the operating point and;
which operating point will remain constant throughout
as to return the cam mechanism to the neutral position
as shown in FIGURE 1. The shaft 21 comprises general
ly pivot means for rotatively mounting the cam mech
limit switch which may be mounted on a machine for 40 anism 16.
The cam ?rst part 17 axially slides on the shaft 21 and
control of a machine function thereof and wherein elec
a compression spring 3'25 held by a snap ring 37 in a
trical connections may be made to the switch without dis
life.
Another object of the invention is to provide a precision
groove in the shaft 21 urges the cam ?rst part 17 toward
connection of the switch from the machine on which
the second part 18'. This assures engagement of the raised
mounted.
Another object of the invention is to provide a heavy 45 wall portions 34 in the slots 27 and 28‘. A rim 40‘ on the
?rst part 17 provides a ?nger hold, with the bottom cover
duty snap-acting switch which may have a variety of ad
13 removed, so that the cam ?rst part 17 may be grasped,
justed positions and which also may have a variety of in
pulled outwardly, turned a quarter-turn and released to re
ternal electrical connections and also a variety of different
engage the wall portions 34 with the slots 27 and 28.
forms of contact arrangements capable of being substituted
therein.
50 The cam 21} thus has a different position relative to the
cam follower, described below.
Still another object of the invention is to provide a
An operating lever 42 is connected to the shaft 21 by a
heavy-duty snap-acting switch which is shock proof or
clamping screw 43 and is located outside the housing 11.
jar proof as well as capable of being oil, water, and dust
An engagement roller 44 is journalled at the outboard end
tight.
Other objects and a fuller understanding of this inven 55 of the lever 42 and is positioned in the path of movement
of a movable mechanism 46, see FIGURES 5 and 6. This
tion may be had by referring to the following description
and claims, taken in conjunction with the accompanying
moving mechanism may be any actuating means, for exam
drawings, in which:
ple, it may be a movable part such as a movable slide of
a machine. The operating lever 42 and cam mechanism
FIGURE 1 is an exploded isometric view, partly in
section, of the present switch;
60 may be referred to as being in a ?rst position in FIGURE
FIGURE 2 is a top view of the switch;
5 and may be referred to as being in a second position in
FIGURE 6.
FIGURE 3 is a sectional view on line 3-3 of FIG
URE 4;
The end of the housing 11 opposite the cam mechanism
FIGURE 4 is a longitudinal, vertical, sectional view of
16 is provided with a threaded opening 50‘ communicating
the switch;
65 with the top compartment 15 to receive an electrical con
FIGURE 5 is a bottom view with the cover removed;
duit or the like through which external conductors extend.
FIGURE 6 is a view similar to FIGURE 5, but showing
These conductors may be connected to an external circuit
the switch in a slightly different position;
(not shown) which may be used to control the movement
‘FIGURE 7 is a partial view of a modi?cation of the
of the moving mechanism 46. A terminal block 55 is
switch;
70 secured to the intermediate wall 14 of the housing v11
FIGURE 8 is view similar to FIGURE 7, but showing
by any suitable means, such as screws 56 which extend
the switch in a different position; and
into bosses 57. The terminal block 555 is constructed of
3,053,950
3
insulating material such as a plastic material and has a
longitudinal recess or slot 6% extending lengthwise along
the upper surface thereof, and this slot communicates at
one end portion with the threaded opening 51}. First and
second pairs of terminals 52 and 63, respectively, are
located on ?rst and second end portions, respectively, of
the terminal block 55. A terminal of each pair is located
on either side of the longitudinal slot 60. First and second
pairs of blade type ?xed contacts 65 and 66 are connected
to the terminals 62 and 63, respectively. The construc
tion of the blade type contacts is best seen in FIGURES
,1 and 4 of the drawings. A blade type contact of
each of the pairs also resides on either side of the longi
tudinal slot 60‘.
A contact carrier 81 is supported on the intermediate
wall 14 and positioned below the terminal block 55 and
is movable between ?rst and second positions. The
?rst position is shown to the right as viewed in FIGURES
1 and 4. The contact carrier 81 carries movable blade
type contacts 33 and 84, respectively. The contact car
rier is constructed of insulation material, such as plastic
material. The movable contacts 83 and 84 are electri
cally connected together and are formed from two identi
cal blades 85 urged together by springs 86 mounted on
posts 87 and held by caps 88. The caps may be depressed
and turned a quarter-turn to release the springs 86 and
blades 85 from the posts.
A latchable channel member 9% is carried in the bottom
compartment ‘19 immediately below the intermediate wall
The ‘latchable channel 9%‘ includes a back member
11.
which receive the leg members 93 and 94 of the latchable
channel 913. The latch plate 111 also has an opening 116
which receives the unlatching abutment 109. First and
A
second pairs of latch members or levers 118 and 119, re
spectively, are pivotallyconnected by meansof pins 120
near the center of the latch plate. Each of these latch
members 118 and 1119 has a latch shoulder 1122 with
which the leg members 93 and 94 are engageable and
springs 124 and 125 urge the latch members of a respec
10 tive pair laterally toward each other to be urged into
engagement with the leg members 93 and 94. The latch
shoulder 122 of the ?rst pair of latch members 118 is
adjacent the left edge, as viewed in FIGURES 1 and 5, of
the leg ‘members 93 when the latch release channel 101
is in the ?rst position shown in these ?gures. Each of
the latch ‘members is provided with an actuating surface
126 which is engageable with the unlatching abutment 109.
Operation
The snap switch ‘10 may be used in many different
20
environments and one typical environment is as a preci
sion-limit switch as actuated by an actuating means in this
case shown as a moving mechanism 46.
The snap switch
10 has precision construction permitting it to be precisely
25 actuated from one switch condition to another at a precise
point of movement of the moving mechanism 46, and to
have this switch actuation precisely repeated each time
the moving mechanism 46 moves to that particular point
in its path of movement. External conductors may be
30 connected to either terminals 63 or 62 to provide either
normally closed or normally open switching functions.
92 which has ?rst and second pairs of spaced leg
Assuming that the moving mechanism 46 is traveling in a
members or projections 93 and 944, respectively, integral
downward direction indicated by the arrow 129, then en
ly connected thereto at opposite end portions. All leg
gagement of the mechanism 46 with the engagement roller
members extend generally perpendicularly to the back
member 92.
Carrier pins 97 fasten together the latchable 35 44 causes the cam mechanism and the cam member 20 to
rotate in a clockwise direction as viewed in FIGURES 5
and 6. Rotation of the cam member 20 causes the cam
follower roller 108 on the latch release channel 101 to
travel from engagement with the ?rst surface portion 23 to
positions, with the ?rst position being to the right as viewed
in FIGURES 1 and 4. This latch release channel is also 40 the second surface portion 24 of the cam member 20.
This action initially causes movement of the latch release
movable relative to the spaced leg members as will herein
channel 101 from the ?rst toward the second position and
after ‘he described. The latch release channel 101 at an
also causes the ?rst lug 103 to engage the ?rst pair of
intermediate portion thereof, houses ?rst and second rela
channel member 00 and the contact carrier 81 and extend
through a slot 98 in the intermediate wall 14. A latch re
lease channel ltll is movable between ?rst and second
spaced leg members 93 which urges the latchable channel
90‘ toward the second position. The latchable channel,
however, is initially held from movement toward the sec
ond position because the latch shoulders 122 on the ?rst
pair of latch members 118 engage the left side of the ?rst
them and as a result urge the latchable channel 95} to the
pair of leg members 93 and prevent movement of the
second position when the latch release channel moves to
the second position. A return spring \107 is positioned at 50 latchable channel 90. During this period when the latch
able channel 90 is held against movement, the latch re
one end of the latch release channel 101 and urges same
lease channel 101 is moving toward the left, and the ?rst
to its ?rst position. A cam follower roller 108 is jour
lug 103 which engages the ?rst pair of leg members 93 com
nalled on the other end of the latch release channel 101
presses the lug spring 1G5. This construction, therefore,
and is adapted for engagement with the cam member 20
and alternatively engages the ?rst and second surface por 55 in the initial movement of the latch release channel 101,
permits relative movement between this latch release chan
tions 23 and 24 of this cam member. Movement of the
nel and the latchable channel 90. The movement of the
cam follower roller 168 from engagement with the ?rst
latch release channel 101 causes movement of the unlatch
surface portion 23 of the cam to engagement with the sec
ing abutment 109 which engages the actuating surface
ond surface portion 24 causes the latch release channel
126 on the ?rst pair of latch levers 118 and continues to
101 to move from its ?rst to its second position. This
urge the ?rst pair of latch levers against the urging of the
progressive movement is best seen in FIGURES 5 and 6.
spring 1124. Upon su?icient longitudinal movement of the
An unlatching stud or abutment means 169‘ is ?xedly
latch release channel 101, the unlatching abtument 109
secured to the latch release channel 101 and is adapted to
forces the ?rst pair of latch levers 118 suf?ciently far apart
travel therewith between the ?rst and second positions of
the channel ‘101.
65 so that the latch shoulders 122 release the ?rst pair of
tively movable lugs 103 and 104 and a lug spring or
resilient means 105 is positioned between these two lugs
and urges them apart. The function of the ?rst lug 103
is to engage the ?rst pair of spaced members 93 and urge
A latch plate 111 is located near the bottom cover 13 and
is secured to the housing by means of screws 112 at bosses
113. The latch plate ‘111 serves to con?ne the latch re
lease channel 101 and the latchable channel member 90
leg members 93, at which time the compressed lu-g spring
1E5 by way of the ?rst lug I103 rapidly moves the latchable
channel 90 to the second position.
‘Since the contact car
rier 81 is operatively connected to the latchable channel
within the bottom compartment of the housing 11. Inte_ 70 Q0, this contact carrier also travels rapidly from the ?rst
to, the second position. This rapid movement is trans
gral guides 114 on the plate 111 serve as a guideway for
mitted to the movable contacts 83 and 84 which rapidly
sliding movement of the latch release channel ‘101 and re
break electrical connection between the second blade
sist any side thrust on the latch release channel 101 as
type contacts '66 and then make electrical connection be
exerted by the cam 20 acting on the cam follower roller
108. The latch plate 111 is provided with slots 115 75 tween the ?rst pair of blade type contacts 65. Overtravel
5
3,053,956
downwardly of the mechanism 4-6 is permitted by the cam
mechanism 20 and torsion spring 36.
When the moving mechanism 46 moves upwardly from
the position shown in FIGURE 6, the cam mechanism re
FIGURE 3, but ‘with the upper part of the terminal block
removed.
In FIGURES 9 and 10 the ?xed terminals 62 have con
nected thereto a ?rst pair of ?xed contacts 140 of the butt
turn spring 36 causes the cam member 20* to move in a 5 type and the second pair of terminals 63 have connected
counterclockwise direction from the position in FIGURE
6 to the position in FIGURE 5. While this movement is
taking place, the return spring 107 moves the latch release
channel 101 from the second position to the ?rst position.
This movement causes the snap switch '10 to function in
much the same way only in reverse to that described above.
thereto a second pair of ?xed butt-type contacts 1141. A
modi?ed contact carrier 81A is provided which carries ?rst
and second movable contacts ‘142 and 143, respectively.
These contacts 142 and Y143 abut shoulders 144 in the con
tact carrier 81 and are urged thereagainst by a compression
spring 145.
The initial movement of the latch release channel 101 from
FIGURES 7 and 8 show the latching mechanism in
the second toward the ?rst position causes the second
cluding the same latch plate 111 pivotally mounting ?rst
lug 1104 to engage the second pair of leg members 94 to
and second pairs of latch levers 151 and 152, respectively.
urge the latchable channel 90 to the ?rst position along 15 The unlatching stud 109 engages actuating surfaces 126
with the latch release channel 101. The second pair of
on these levers, the same as in FIGURES l—6=. Each
latch lever has inboard and outboard shoulders ‘153 and
latch levers, 119, however, engage the right edge of the
second pair of leg members 94 and prevent the latchable
channel member 90 from moving to the ?rst position,
which causes the lug spring 105 to be compressed. Upon '
further movement of the latch release channel 101 toward
154-, respectively, for engagement with the legs 93 and 94
of the same latchable channel member 90‘. A rotatable
cam 20A has a small radius portion 23 and a large radius
portion '24 plus an intermediate radius portion 156. This
the ?rst position, the unlatching abutment 109 forces the
cam 20A again cooperates with the cam follower roller
second pair of latch levers 119 far enough apart to release
108. In this embodiment the torsion spring 36 shown in
these latch levers from the second pair of leg members 94.
FIGURE 1 would be mounted to urge the cam 20A so
This permits the force which has been built up by com 25 that the intermediate radius portion 156 engaged the roller
pressing the lug spring 105 to act upon the latchable chan
108. This establishes the latch release channel 101 in an
nel member 90 to rapidly move the same to the ?rst posi
intermediate position and; hence, the unlatching stud 109
tion. This rapid movement is transmitted to the movable
is in an intermediate position as shown in FIGURE 7.
contacts carried by the contact carrier 81 and provides a
Operation
quick break at the ?rst contacts 65 and a quick make 30
The latch release channel 101 is adapted to have the,
at the ?xed contacts 66.
intermediate position as well as the ?rst and second posi
To change the rotational direction of operation of the
tions as in the embodiment of FIGURES 1—6. The inter
switch or the switch position, for example, if the mecha
mediate position is as shown in FIGURES 7 and 9 and
nism 46 were located at the lower right-hand corner of
the switch (FIGURE 5) rather than at the upper right 35 the second position is to the left ‘as shown in FIGURES
8 and 10. The ?rst position would be similar to that
hand corner, it is only necessary to remove the bottom
‘shown in FIGURES 1 and 5, whereat the movable con
cover 13 and pull out and rotate the ?rst part 17 of the
tacts 143 would be to the right to engage the ?xed con
cam mechanism 16 substantially ninety degrees so that the
tacts 141. With the switch in the position shown in
raised wall portions 34 inter?t with the alternate slots 27
and 28. The bottom cover is then re-positioned and 40 FIGURES 7 and 9; namely, the intermediate position, the
latch levers 151 and 152 are positioned so that the out
fastened in place. The operation of the switch is the
board shoulders 154- are adjacent and ready to engage
same as described hereinabove, except now the latch release
the leg members 03 and 94- therefore this holds the latch;
channel 101 is actuated to the second position by a
able channel member 90 in an intermediate position to
counter clockwise rotation of the cam 20. It ‘will be seen
that this permits greater latitude in selecting the opera 45 also hold the contact carrier 81A in the intermediate posi
tion; hence, movable contacts 142 and 143 are out of
tional positions of the switch. The operating lever may
engagement with all ?xed contacts. If the cam member
also be adjusted relative to the shaft 21 by means of the
20A is rotated clockwise, as shown in the transition from
clamping screw 43.
FIGURE 7 to 8, this urges the cam follower roller 108 to
The blade type contacts on both the movable and ?xed
contacts permit the entire switch 10 to be shock proof or 50 the left and hence, the unlatching stud 109 is moved to the
left. First this compresses the lug spring 105 as seen
jar proof so that it will Withstand stresses in all directions
in FIGURE 1 to urge the latchable channel member 90 to
yet the contacts will remain established in the position to
which they have been actuated. Also, the blades 85 of
the movable contacts 83 and 84 are urged by the springs
86 so that these movable contacts 83 and 84- make a slid
ing or wiping action with the ?xed contacts 65 and 66 to
the left, but such movement is prevented because the out
board shoulders 154 of the latch levers 151 engage the
55 leg members 93. Upon sui?cient movement, the un
latching stud 10% engages the actuating surfaces 126 to
move outwardly the latch levers 151 and unlatch the chan
nel member 90. The stored energy in the lug spring 105
switching. As the movable contacts 83 and 84 slide onto
is released to quickly move the contact carrier 81A and
a pair of the ?xed contacts, the movable contacts are
forced apart slightly to compress the springs 86 to thus as 60 to move the movable contacts 142 into engagement with
the ?xed contacts 140. The spring 125 urges the latch
sure a positive contact pressure. Also, since the movable
levers 152 inwardly so that the inboard shoulders 153
blade contacts 83 and 84 are urged together by the springs
are adjacent the leg members 94. Consequently, upon
86 in a direction generally perpendicular to the direction
return movement of the unlatching stud 109‘ to the right,
of travel of the contact carrier 81, this means that the
assure continuously clean contacts for sure electrical
movable contacts 83 and 84 move the same distance as the
5 such as upon the occurrence of counterclockwise rota
tion of the cam 20A from the position shown in FIGURE
8, the latchable channel member 90 is prevented from
movement
to the right because the inboard shoulders 153
84 is not necessary.
engage the leg members 94. Thus, energy is ‘stored in,
The FIGURES 7-9 show a modi?cation of the invention 70 the lug spring 105 until the unlatching stud 109 has sep
and show only partial views of the switch 10 wherein com
arated the latch levers 152 su?iciently that the leg mem
ponents are changed. FIGURES 7 and 8 are partial views
bers 94 slide off the inboard shoulders 153. This thenv
similar to FIGURES 5 and 6 showing the latching mech
restores the switch to the condition shown in FIGURES’
anism, and FIGURES 9 and 10 are partial views of the
7 and 9 which means that the movable contacts 142 have
?xed terminals and contact carrier similar to the view of 75 broken engagement with the ?xed contacts 140. If the
contact carrier 81 so that provision for overtravel of the
contact carrier 81 relative to the movable contacts 83 and
3,053,950
i
cam member 20A is rotated counterclockwise from the
position shown in FIGURE 7, then the return spring 107,
FIGURE l,4urges the cam follower roller 103 and un
latching stud 109 ‘to the right from the position shown
in FIGURE 7 and this causes a switch actuating move
ment similar to that described above, wherein the out
board shoulders 154 of the levers 152 are released from
the leg members 94; hence, the movable contacts 143 en
gage the ?xed contacts 141 with a snap action.
It will be seen that the modi?cation of FIGURES 7-9
provides a switch which has not only ?rst and second
alternative switch conditions, but also an intermediate
or neutral o? condition wherein no ?xed conditions, but
members extending generally laterally from said latchable
channel, means connecting together said movable contacts
and said latchable channel for corresponding movement,
a latch release channel located adjacent said leg members
for movement between ?rst and second positions, spring
means in said latch release channel and acting on said
?rst leg member and urging said latchable channel to
ward said second position on movement of said latch
release channel toward said second position and acting
on said second leg member and urging said latchable
channel toward said ?rst position on movement of said
latch release channel toward said ?rst position, unlatching
stud means carried by said latch release channel, ?rst
also an intermediate or neutral oh“ condition wherein no
and second latch levers pivotally connected relative to
?xed contacts are closed. Thus by changing the type of 15 said housing, each said latch lever having a latch shoulder
contacts from blade type to butt type, changing the latch
with which a leg member is engageable and having an
actuating surface engageable by said unlatching stud means
levers to ones with two shoulders and providing an inter
mediate radius portion on the cam member 20A, one is
to move the same to an unlatched condition, each said
able to achieve greater ?exibility in the switch 10 by
providing a different form of switching function. It will
latch lever being a bell crank lever having said latch
shoulder and said actuating surface on di?erent legs and
with the leverage ratio establishing a ratio of movement
be noted that the ‘butt-type contacts 142 and 143 may be
used -_on the switch construction of FIGURES 1-6 if de
of said latch shoulder relative to the movement of said
sired, and also two or more contact carriers 81 or 81A
actuating surface of greater than unity, and second spring
means urging said latch levers toward a latched condition,
may be actuated by the latchable channel member 90 if
multiple switching functions are desired.
25 said latch shoulder of said ?rst latch lever engaging said
?rst leg member in the ?rst position of said latch release
It will thus be seen that a snap action switch has been
channel to prevent movement of said latchable channel
provided wherein the quick movement of a movable switch
toward said second position until said unlatching stud
contact relative to a ?xed contact is eitected by building
means unlatches said ?rst latch lever, and said latch
up ‘a force tending to move the movable contact while
latching this contact from movement. After a prede 30 shoulder of said second lever engaging said second
leg member in the second position of said latch release
termined force has been built up, the movable contact
channel to prevent movement of said latchable channel
is unlatched and the force which is built up can be effec
toward said ?rst position until said unlatching stud means
tively used at once to bring about a quick action. This
unlatches said second latch lever.
reduces sparking between the contacts and resultant burn
2. A snap action switch including, in combination, a
ing and pitting of the same. It necesarily follows that 35
housing having top and bottom compartments, a terminal
the life of the contacts is greatly increased. The action
block in said top compartment, ?xed contacts on said
of the springs 86 provides a de?nite contact pressure be
terminal block, a contact carrier movable between ?rst
tween the switch contacts giving a positive electrical con
and second positions in said top compartment, movable
nection. The use of the upper and lower compartments
15 and '19 permits the switch 10 to be mounted where de 40 contacts carried by said contact carrier and engageable
with said ?xed contacts, a latch plate ?xed in said bottom
sired, ‘and then the external wiring connected to the switch
compartment, a latchable channel in said bottom compart
by removing the top cover 12, and without need to re
ment adjacent said latch plate and movable between ?rst
move the switch to connect the wiring. The construction
and second positions, a back member on said latchable
of the cam mechanism which includes the ?rst and second
channel and having ?rst and second leg members extend
par-ts 17 and 18 offers a switch construction which can
be easily adjusted to provide either right or left-hand
operation of the switch.
ing generally laterally therefrom, means connecting said
dilterent operating points each of which, however, will be
?rst and second lugs carried by said latch release channel,
spring means acting on said ?rst and second lugs, said
contact carrier and said latchable channel together for
corresponding movement, a latch release channel located
The cam memebr 20 may also be of any desired shape,
adjacent said leg members for movement between ?rst
and other than that shown in FIGURES 5 to 8. Such
changes in shape of the cam member 20- can provide for 50 and second positions and relative to said leg members,
accurately predetermined so that the switch 10 is pre
cisely operated in the same point in travel of the moving
?rst lug engaging said ?rst leg member and urging said
latchable channel toward said second position on move
mechanism 46 for repetitive movement of the mechanism
46. For example, the cam mechanism 20 may have 55 ment of said latch release channel toward said second
position, said second lug engaging said second leg mem
plural lobes :for alternative ‘actuation of the switch con
ber and urging said latchable channel toward said ?rst
tacts during continuous rotary movement of the cam
position on movement of said latch release channel to
mechanism 20. For such continuous rotary movement
ward said ?rst position, return spring means urging said
the torsion spring 36 would be removed.
latch release channel to said ?rst position, an unlatching
Although this invention has been described in its pre
stud carried by said latch release channel, ?rst and sec
ferred form with a certain degree of particularity, it is
ond latch levers pivotally connected to said latch plate,
understood that the present disclosure of the preferred
form has been made only by way of example and that
each said latch lever having a latch shoulder with which a
leg member is engageable and having an actuating surface
numerous changes in the details of construction and the
combination and arrangement of parts may be resorted to 65 engageable by said unlatching stud to move the same to
an unlatched condition, each said latch lever being a
without departing from the spirit and the scope of the
bell crank lever having said latch shoulder and said actu
invention as hereinafter claimed.
ating surface on different legs and with the leverage ratio
What is claimed is:
establishing a ratio of movement of said latch shoulder
1. A snap action switch including, in combination, a
housing having top and bottom compartments, 3. terminal 70 relative to the movement of said actuating surface of
greater than unity, and spring means urging said latch
block in said top compartment, ?xed contacts on said
levers toward a latched condition, said latch shoulder of
terminal block, movable contacts located in said top com
said ?rst latch lever engaging said ?rst leg member in the
partment and engageable with said ?xed contacts, a latch
?rst position of said latch release channel to prevent
able channel in said bottom compartment movable be
tween ?rst and second positions, ?rst and second leg 75 movement of said latchable channel toward said second
3,053,950
position until said unlatching stud unlatches said ?rst
latch lever, and said latch shoulder of said second latch
lever engaging said second leg member in the second posi
tion of said latch release channel to prevent movement
mediate wall and movable between ?rst‘ and second posié
tions, a back member on said latchable channel and
having ?rst and second leg members extending generally
laterally therefrom, means connecting said contact carrier
and said latchable channel together through a slot in said,
intermediate wall, a latch release channel located ad
jacent said leg members for movement between ?rst and
second positions and relative to said leg members, ?rst
and second lugs carried by said latch release channel, a
of said latchable channel toward said ?rst position until
said unlatching stud unlatches said second latch lever.
3. A snap action switch including, in combination, a
housing having top and bottom compartments, a cam
mechanism rotatively mounted in said housing, an oper
ating lever operatively connected to partially rotate said 10 spring between said ?rst and second lugs urging them
cam mechanism and residing outside said housing, a spring
apart, said ?rst lug engaging said ?rst leg member and
member urging said cam mechanism to a ?rst position, a
urging said latchable channel toward said second posi
terminal block in said top compartment, terminals on said
tion on movement of said latch release channel toward
terminal block for connection with external conductors, a
said second position, said second lug engaging said second
?xed contact on each said terminal, a contact carrier mov 15 leg member and urging said latchable channel toward
able between ?rst and second positions and located in said
said ?rst position on movement of said latch releasew
top compartment, movable contacts carried by said con
channel toward said ?rst position, return spring means
tact carrier and engageable with said ?xed contacts, a
urging said latch release channel toward said ?rst posi
latch plate ?xed in said bottom compartment, a latchable
tion, an unlatching stud carried by said latch release
channel in said bottom compartment adjacent said latch
channel, a cam follower carried by said latch release
plate and movable between ?rst and second positions, a
channel and residing adjacent and engageable with said
back member on said latchable channel and having ?rst
cam mechanism, ?rst and second latch levers pivotally
and second leg members extending generally laterally
connected to said latch plate, each said latch tlever having
therefrom, means connecting said contact carrier and said
a latch shoulder with which a leg member is engageable
latchable channel together for corresponding movement, a 25 and having an actuating surface engageable by said un
latch release channel located adjacent said leg members
latching stud to move the same to an unlatched condi
for movement between ?rst and second positions and rela
tion, spring means urging said latch levers to a latched
tive to said leg members, ?rst and second lugs carried by
condition, said latch shoulder of said ?rst latch lever
said latch release channel, a spring between said ?rst and
engaging said ?rst leg member in the ?rst position of said
second lugs urging them apart, said ?rst lug engaging said 30 latch release channel to prevent movement of said latch-\
?rst leg member and urging said latchable channel toward
able channel toward said second position until said un
said second position on movement of said latch release
latching stud unlatches said ?rst latch lever, and said
channel toward said second position, said second lug en
latch shoulder of said second latch lever engaging said’
gaging said second leg member and urging said latchable
second leg member in the second position of said latch
channel toward said ?rst position on movement of said 35 release channel to prevent movement of said latchable
latch release channel toward said ?rst position, return
channel toward said ?rst position until said unlatching
spring means urging said latch release channel toward
stud unlatches said second latch lever.
said ?rst position, an unlatching stud carried by said latch
5. A snap action switch including, in combination, a‘_
release channel, a cam follower carried by said latch re
housing having top and bottom compartments closed by
lease channel and residing adjacent and engageable with
top and bottom covers, respectively, an intermediate wall
said cam mechanism, ?rst and second latch levers pivotally
in said housing forming a bottom of each said compart
connected to said latch plate, each said latch lever hav
ment, a cam mechanism rotatively mounted in one end
ing a latch shoulder with which a leg member is engage
of said housing, an operating lever operatively connected
able and having an actuating surface engageable by said
to partially rotate said cam mechanism and residing out
unlatching stud to move the same to an unlatched con
side said housing, means permitting angular adjustment:
dition, spring means urging said latch levers toward a
of said cam mechanism, said operating lever having an
latched condition, said latch shoulder of said ?rst latch
engagement roller on an end portion thereof to transmit
lever engaging said ?rst leg member in the ?rst position
movement from a mechanism to move said cam mech4
of said latch release channel to prevent movement of said
anism from a ?rst to a second position, a spring member,
latchable channel toward said second position until said 50 urging said cam mechanism to a ?rst position, a terminal
unlatching stud unlatches said ?rst latch lever, and said
block fastened in said top compartment, terminals on
latch shoulder of said second latch lever engaging said
said terminal block for connection with external consecond leg member in the second position of said latch
ductors and accessible with said top cover removed, a
release channel to prevent movement of said latchable
blade type ?xed contact on each said terminal, an elec
channel toward said ?rst position until said unlatching
stud unlatches said second latch lever.
4. A snap action switch including, in combination, a
housing having top and botom compartments closed by
top and bottom covers, respectively, an intermediate wall
in said housing forming a bottom of each said compart
ment, a cam mechanism rotatively mounted in said hous
"H.
ing, an operating lever operatively connected to partially
rotate said cam mechanism and residing outside said
housing, means permitting angular adjustment of said cam
mechanism, a spring member urging said cam mech
anism to a ?rst position, a terminal block in said top
compartment, terminals on said terminal block for con
nection with external conductors, a ?xed contact on each
said terminal, a contact carrier movable between ?rst and
second positions and located in said top compartment,
movable contacts carried by said contact carrier and
engageable with said ?xed contacts, a latch plate ?xed
in said bottom compartment spaced from the bottom
thereof, a latchable channel supported by said latch plate
and disposed between said latch plate and said inter 75
trically insulated contact carrier movable between ?rst
and second positions and located in said top compartment
between said terminal block and said intermediate wall,
movable blade type contacts carried by said contact carrier
and enageable with said ?xed contacts, ‘a latch plate
?xed in said bottom compartment spaced from the bottom ~
thereof, a latchable channel supported by said latch plate,
and disposed between said latch plate and said interme
diate wall and movable between ?rst and second positions,
a back member on said latchable channel and having
?rst and second pairs of leg members extending gen
erally laterally therefrom toward said bottom cover, a
longitudinal slot in said intermediate wall, means con
necting said contact carrier and said latchable channel to-~
gether through said slot in said intermediate wall, a latch
release channel located between said leg members for
movement between ?rst and second positions ‘and rela
tive to said leg members, ?rst and second lugs carried
by said latch release channel, a spring between said ?rst
and second lugs urging them apart, said ?rst lug engaging
said ?rst pair of leg members and urging said latchable
3,053,950
11
12
channel to said second position on movement of said
nel located adjacent said leg members for movement be
latch release channel toward said second position, said
second lug engaging said second pair of leg members and
tween ?rst and second Vpositions,.spring means in said
urging said latchable channel to said ?rst position on
movement of said latch release channel toward said ?rst
position, return spring means urging said latch release
channel to said ?rst position, an unlatching stud carried
by said latch release channel, a cam follower carried by
one end of said latch release channel and residing ad
jacent and engageable with said cam mechanism, said 10
saidsecond position and acting on said second leg member
and urging said latchable channel toward said ?rst posi
latch release channel and acting on .said ?rst leg member
and urging said latchable channel toward said second
position on movementof‘said latch release channel toward
tion on movement of said latch release channel toward
said ?rst position, unlatching stud means carried by said
latch release channel, ?rst and second latch levers pivotally
connected relative to said housing, each said latch lever
latch plate having slots for the reception of said leg
having a latch shoulder with which a leg member is en
members of said latchable channel and having an opening
gageable and having an actuating surface engageable by
for the reception of said unlatching stud, ?rst and second
said unlatching stud means to move the same to an un
pairs of latch levers pivotally connected to said latch
plate, each said latch lever having a latch shoulder with 15 latched condition, each said latch lever being a bell crank
lever having said latch shoulder and said actuating surface
which a leg member is engageable and having an actuat
on di?erent legs and with. the leverage ratio establishing
ing surface engageable by said unlatching stud to move
the same to an unlatched condition, spring means urging
said latch levers to a latched condition, said latch
a ratio of movement of said latch shoulder relative to the
shoulders of said ?rst pair of latch levers engaging said
?rst leg members in the ?rst position of said latch release
movement of said actuating surface of greater than unity,
and second spring means urging said latch levers toward
a latched condition, said latch shoulder of said ?rst latch
channel to prevent movement of said latchable channel
lever engaging said ?rst leg member in the ?rst position
of said latch release channel to prevent movement of said
to said second position until said unlatching stud unlatches
latchable channel toward said second position until said
said ?rst latch levers, and said latch shoulders of said
second pair of latch levers engaging said second leg 25 unlatching stud means unlatches said ?rst latch lever, and
members in the second position of said latch release cha. nel to prevent movement of said latchable channel to said
?rst position until said unlatching stud unlatches said
‘ said latch shoulder of said second latch lever engaging
said second leg member in the second position of said
latch release channel to prevent movement of said latch
able channel toward said ?rst position until said unlatch
second latch levers.
6. A snap action switch including, in combination, a 30 ing stud means unlatches said second latch lever.
8. A snap action switch including, in combination, a
housing, relatively ?xed contact means in said housing,
housing, ?rst contact means in said housing, movable
movable contact means engageable with said ?xed contact
contact means engageable with said ?rst contact means, a
means, a latchable member in said housing movable be
latchable member in said housing movable between ?rst
tween ?rst and second positions, a leg member extending
and second positions, means connecting together said mov
generally laterally from said latchable member, means
able contact means and said latchable member for corre
connecting together said movable contact means and said
sponding movement, a latch release channel movable be
latchable member for corresponding movement, a latch
tween ?rst and second positions, spring means urging said
release channel located adjacent said leg member for
latchable member toward said second position on move
movement between ?rst and second positions, spring means
in said latch release channel and acting on said leg mem 40 ment of said latch release channel toward said second
position, unlatching stud means carried by said latch re
ber and urging said latchable member toward said second
lease channel, latch lever means pivotally connected rela
position on movement of said latch release channel toward
tive to said housing and having a latch shoulder with
said second position, unlatching stud means carried by
which said latchable member is engageable and having an
said latch release channel, latch lever means pivotally con
actuating surface engageable by said unlatching stud
nected relative to said housing and having a-latch shoulder
means to move the same to an unlatched condition, said
with which said leg member is engageable and having an
latch lever means including a bell crank lever having said
actuating surface engageable by said unlatching stud
latch shoulder on one leg and having said actuating sur
means to move the same to an unlatched condition, said
face on the other leg and with the relative lengths of said
latch lever means including a bell crank lever having said
latch shoulder on one leg and having said actuating sur 50 legs establishing a ratio of movement of said latch shoul
der relative to the movement of said actuating surface of
face on the other leg and with the relative lengths of said
greater than unity, and said spring means urging said
legs establishing a ratio of movement of said latch shoul
latch lever means toward a latched condition, said latch
der relative to the movement of said actuating surface of
shoulder of said latch lever means engaging said latchable
greater than one to one, and second spring means urging
said latch lever means toward a latched condition, said 55 member in the ?rst position of said latch release channel
to prevent movement of said latchable member toward
latch shoulder of said latch lever means engaging said leg
said second position until said unlatching stud means un
member in the ?rst position of said latch release channel
latches said latch lever means.
to prevent movement of said latchable member toward
said second position until said unlatching stud means un
References Cited in the ?le of this patent
latches said latch lever means.
7. A snap action switch including, in combination, a
UNITED STATES PATENTS
housing, relatively ?xed contacts in said housing, movable
contacts engageable with said ?xed contacts, a latchable
channel in said housing movable between ?rst and second
positions, ?rst and second leg members extending gen 65
erally laterally from said latchable channel, means con
necting together said movable contacts and said latchable
channel for corresponding movement, a latch release chan
1,559,329
2,390,365
2,428,832
2,707,734
2,783,323
2,958,747
Lemlyn ______________ __ Oct. 27,
Golf _________________ __ Dec. 4,
Charbonneau _________ __ Oct. 14,
Dobes et al ____________ __ May 3,
Ie?rey ______________ __ Feb. 26,
1925
1945
1947
1955
1957
Dobes ________________ __ Nov. 1, 1960
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