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Nov. 26, 1946. '
W. J. KELLEIGH
ELECTRIC SWITCH
Filed Aug. 4,v 1943
_
2,411,576
2,411,576
Patented Nov. 26, 1946
UNITED STATES PATENT OFFICE
2,411,576
ELECTRIC SWITCH
Waldo J. Kelleigh, Wayland, Mass., assigner to
General Control Company, Cambridge, Mass., a
corporation of Massachusetts
Application August 4, 1943, Serial No. 497,314
S Claims.
(Cl. 200-1)
2
1
prolonging its life. By providing coil springs in- A
This invention relates to electric switches and
stead of leaf springs for actuating the detents the
more particularly switches of the so-called tele
'springs are less expensive, last longer and can
phone type adapted to be mounted in a switch
-be replaced more readily and economically. In
board panel with nothing but the handle or key
the preferred construction the thrusts imparted
projecting from the face of the board, each switch
to the opposite sides of the actuator by the detent
comprising a frame, a contact block, a plurality
springs automatically equalize. Thus the springs
of groups of Contact springs mounted on the block
have no tendency to tip the actuator and conse
and an actuator for operating the contacts.
quently the actuator operates with less friction.
Objects of the present invention are to provide
In still another aspect the invention involves
a switch which is simple and economical to manu 10
a frame having two legs with a space therebe
facture, which is durable and reliable in use,
tween and a contact block ñtted into the space
which can -be readily converted from a locking
with grooves in one or both sides of the block to
receive one or both of the legs. The contact block
tion until returned to neutral position to the nonlocking type in which the key remains in opera 15 is preferably fastened on the frame by means of
a screw or other fastener extending through the
tive position only so long as it is held in that po
type in which the key remains in operative posi
sition by hand, which has a long life, which elec
trostatically shields opposite groups of contacts
block lengthwise of the legs into engagement with
the frame. When the frame is in the form of
two plates as aforesaid, the plates are held to
from each other, which is self-aligning in the
process of assembling the parts together, and 20 gether by the grooves in the contact block, and by
making a fairly snug fit between the block and
which is generally superior to prior switches of
plates the parts are self-aligning when the block
the character referred to.
is slipped into the slots in the plates.
In-one aspect the invention involves a frame
For the purpose of illustration a typical em
having a supporting wall with a group of spring
contacts mounted on-- one side of the wall and 25 bodiment of the invention is shown in the accom
panying drawing in which
an actuator movably mounted on the other side
Fig. 1 is a side elevation;
of the wall, the actuator having a roller or other
Fig. 2 is an end elevation; `
operator extending through an opening in the
Fig. 3 is a section on line 3--3 of Fig. 1;
wall for operating the contacts, and a spring
Fig. 4 is a bottom view;
actuated detent mounted on the first side of the 30
Fig. 5 is a section on line 5_5 of Fig. 1;
wall for engagement with the actuator through
Fig. 6 is a perspective view of the actuator;
an opening in the wall yieldingly to hold the ac
Fig. ’7 is a perspective view of one of the spring
tuator in one or more of the positions to which it
detents;
is moved.
Fig. 8 is a side elevation of a slight modiñca
In a more specific aspect the invention involves 35
two walls with a space therebetween for the aiore
said actuator and with a support for switch con
tacts on both sides of the juxtaposed walls.
tion; and
`
Fig. 9 is a section on line 9-9 of Fig. 1.
The particular embodiment of the invention
chosen for the purpose of illustration comprises
When employing two frame plates a spring-ac
tuated detent is preferably provided on each plate, 40 two frame plates l and 2 which are offset at 3
so that, with their lower ends abutting each other
the two detents pinching the actuator therebe
face to face, the upper ends are separated by a
tween through openings in the plates. By pro
space il, the tips of the upper ends being bent
viding a detent on each side the thrusts of the
outwardly to form flanges Ei and 'l for mounting
two detents tend to counteract each other thereby
the switch on a switchboard or the like. The
reducing the friction and wear on the pivot pin
upper ends of the plates may be interconnected
of the actuator or other part which controls its
by rivets S and the lower ends may also be riveted
path of movement. By making the actuator of
together as indicated at Q. Extending upwardly
variable thickness along the zone engaged by the
from the bottom edges of the frame plates are
detents the actuator is yieldingly held in prede
termined positions, as for example a neutral cen 50 slots Il (Figs. 1 and 4) dividing the frame into
tral position and an operating position on one
two legs, and mounted in these slots is a Contact
or both sides of the neutral position. By provid
ing the detents with rollers for rolling engage
ment with the actuator the friction is reduced,
thereby making the switch easier to operate and 55
block l2, the opposite sides of the block having
grooves to receive the edges of the slots. From
the upper ends of the slots H to the shoulder 3,
the plates are pressed outwardly as indicated at
3
2,411,576
I3 to form opposing grooves which together form
a cylindrical socket. After the plates are secured
together this socket is threaded to receive a screw
lil which extends through a vertical opening l5
in the block l2 and then threads into the socket.
Mounted on the opposite sides of the contact
block l2 are four lgroups 2l, 22, 23 and 24 of con
tact springs, the springs being held by screws
p26 with a layer 2l of insulation on eachside of
4
tor are balanced and there is no tendency to tip
the actuator out of its plane of movement. In
this way friction is minimized, whereby the actu
ator moves with ease and with little wear.
The plates l and 2 are provided with opposed
openings El and 62 for use in the event that it
is desired to prevent the actuator from moving
far enough to the right or left to be held in oper
ative position by the spring detent. Thus Fig. 8
each spring. The heads of the screws seat on a lil shows a rivet il?, in the opening 62 for limiting the
plate 23 and the other ends of the screws are
movement of the key 313 to the left, Thus when
threaded into a plate 29. In the illustration each
group of contact springs comprises a central
spring which is somewhat longer than the other
two springs and which is engageable with either
of the other two springs. As shown in the draw
ing the center spring usually contacts with the
inner spring when the key is in the central neu
tral position shown in Figs. 1 and 3 and, when the
key is moved to one of its operative positions, the
central spring is moved out of contact with the
inner spring in_to contact with the outer spring,
The actuator for operating the contact spring
comprises a cam plate 3l which is pivotally
mounted in the space il by means of a pivot pin
32. The upper edge of the cam plate is pro
vided with a threaded extension 33 to receive the
handle tél. Mounted in opening 3B in the cam
plate are tubes which project laterally through
the arcuate slots 38 in the plates I and 2. Mount
ed on the projecting ends of the tube are rollers
4| for operating the middle springs of the groups,
the rollers being held on the tubes by means of
screws ¿i2 threaded> into the ends of the tubes.
The actuator is also provided with an opening
¿i3 (Fig. l) to receive a stop pin for use in the
event that it is desired to prevent movement of
the actuator in one direction (counterclockwise
in Fig. l) . By omitting the pin M the key 34 may
be thrown either to the right or to the left.
For the purpose of holding the actuator in its
central position or in its right or left operating
position, the lower end of the plate 3l is shaped
so that it is thin in the middle 6G and at the ends
tl', but relatively thick in between, the thickness
varying gradually from minimumV to maximum
and vice versa.
MountedA on the outside of the
the key is released it returns to neutral position
instead of remaining in the left-hand operative
position.
From the foregoing it will be understood that
the modiiication shown in Fig. 8 differs from the
construction of the preceding iigures only in that
a rivet 53 has been mounted in the opening 62.
lt will' be evident that by making the frame
l--2 of metal it electrostatically shields the two
groups oi contacts 2l and 22 from the two groups
and 2li, thereby avoiding interference between
the currents in the circuits on opposite sides of
the switch. Ey virtue of the double-plate con
struction a very rigid frame can be made with
relatively thin stock.
This construction also
affords a convenient and effective way of mount
ing the actuator Si, namely by an ordinary rivet
so as to be self-centering without providing shoul
ders on the rivet. By virtue of the telescope in
terengagement between the switch block and the
frame plates the parts are self-aligning in the
process of manufacture and after being assem
bled the engagement of the edges of the frame
plates in the grooves of the switch block l2 serve _
to hold the two plates together. The-unique con
struction also permits the parts to be held to
gether by the single screw le. Moreover both the
actuator and the contact block are simple in
shape and economical to manufacture. For eX
ample, the actuator may be coined and the block
may be die cast. By pinching the actuator be
tween twoV spring detents the thrusts of the de
tents counteract each other and by providing the
rollers 5t the friction and wear are minimized.
The openings Si and S2 and the pins or rivets
63 aiîord a convenient way of changing a switch
from the locking to the non-locking type and vice
lower end of the plate 22 are detent holders 5i
having legs 52 which straddle the raised portions
versa. For example, the switches may be car
I3 of the plates l and 2. At their upper free ends 50 ried in stock without pins 63 and then, in those
the detent holders are» providedwith openings '5ft
switches to be made non-locking, pins 63 may be
tor accommodate the rollers 56 which rotate o-n
inserted. Likewise the keys may be readily
pins El seating in the semi-circular` recesses 58
changed from two-way to one-way operation by
above and below the openings 5e. The detent
inserting pins in the openings 43,
holders are pressed inwardly by coil springs 'Il
It should be understood that the present dis
(Fig, 9), the inner ends of the springs bearing on
closure is for the purpose of` illustration only and
thevouter faces of the holdersand the outer ends
that this invention includes all modifications and
of the springs reacting against a reactor which,
equivalents which fall within. the scope of the
inthe illustration, comprises a pin l2 having
appended claims.
headson its opposite ends and washers 73 be 60
I claim:
tween the heads and springs. The pin slides
1. An» electric switch comprising contacts, a
freely in a sleeve lll which extends through open
contact
actuator movable from a normal position
ings in the plates l and 2 and openings l5 (Fig. 7)
to an advanced position, detents engaging oppo
in the detent holders, the sleeve being fast to the
site sides of the actuator for holding it in ad
plates l and Zbut fitting the openings l5 loosely.
vanced position, a spring reactor extending trans
Thusthe lower end of the actuator is pinched
versely of the actuator adjacent thereto, the re
betweenthe rollers 55, the holders 5i substan
actor having an abutment outside each detent,
tially meeting the outer faces of the plates í and
and a compression spring outside each detent,
2 whenA the rollers 5t engage parts ¿i6 and lll of
each spring being interposed between one of said
minimum thickness and springing outwardly as
abutments and one of said detents, said reactor
the rollers ride over the thicker parts of the actu
being free to move transversely of the actuator,
ator. Thus the actuator is yieldingly held in the
whereby the thrusts of said springs against said
mid-position or in either one of the operative
detents are automatically equalized.
positions. By virtue of the spring arrangement
the lateral thrusts of the detents on the actua
2.' An electric switch comprising contacts, a
contact actuator movable from a normal position
2,411,576
5
6
to an advanced position, detents engaging oppo
site sides of the actuator for holding it in ad»
which it is moved, a sleeve extending through
openings in said detents and walls, the sleeve nt
vanced position, a pin extending transversely ci
the actuator adjacent thereto, the pin having an
ting the wall openings tightly but being loose in
the detent openings, a pin extending through
abutment outside each detent, and a compression
said sleeve and projecting from each end thereof,
the pin having an abutment beyond each end of
spring outside each detent, each spring ‘seing in
terposed between one of said abutments and o -e
of said detents, said pin being free to move tran, _
versely oi the actuator, whereby the thrusts ci
said springs against said detents are automatical
ly equalized.
3. An electric switch comprising contacts, a
contact actua-tor movable from a normal position
to an advanced position, detents engaging oppo
site sides of the actuato-r for holding it in ad
vanced position, a pin extending transversely oi
the actuator through openings in said detents,
the pin having an abutment outside each detent,
the sleeve, and
compression spring surround
ing the pin outside each detent, each spring be
ing interposed between one of said abutments and
one of said detents, said pin being free to slide
lengthwise in said sleeve, whereby the thrusts of
said springs against said detents are automatical
ly edualized.
7. An electric switch comprising two juxta
posed plates which are oiîset intermediate their
ends to abut each other at their lower ends and
provide a space therebetween at their upper ends,
an actuator mounted in said space to swing par
and a compression spring outside each detent,
each spring being interposed between one of said
abutments and one of said detents, said pin being
free to move transversely of the actuator in said
allel to the plates about transverse axis, groups
or spring contacts mounted on the outside of said
plates with their free ends adjacent said space,
switch operators extending from the actuator
openings, whereby the thrusts of said springs
against said detents are automatically equalized.
through openings in the plates for operating said
groups, said actuator having a handle extending
upwardly beyond said walls and a tail having re
cesses in its opposite sides, rolling detents en
gageable with said recesses through openings in
said upper ends of the plates to hold the actuator
in different positions, holders for the detents
ings in said detents and fitting loosely thereiv, 30 mounted on the outside of said lower ends, a pin
extending transversely of the actuator through
means for supporting the sleeve intermediate the
openings in said holders and the lower ends of
projecting
detents, a pin
fromextending
each endthrough
thereof, said
the sleeve
having
said plates, the pin having an abutment outside
each holder, and a compression spring outside
an abutment beyond each end of the sleeve,
each holder, each spring being interposed between
a compression spring surrounding the pin out
4. An electric switch comprising contacts, a
contact actuator movable from a normal position
to an advanced position, detents engaging oppo
site sides of the actuator for holding it in ad
vanced position, a sleeve extending through open
side each detent, each spring being interposed be
one oi said abutments and one of said holders,
said pin being free to move transversely of the
actuator in said openings, whereby the thrusts
tents, said pin being iree to slide lengthwise in
of said springs against said holders are automati
said sleeve, whereby the thrusts or said springs
against said detents are automatically equalized. 40 cally equalized.
S. An electric switch comprising two juxtaposed
5. An electric switch comprising a traine hav
tween one of said abutments and one of said de»
ing two juxtaposed walls with a space therebe
tween, a group of spring contacts mounted out
side each wall for movement relatively thereto,
an actuator mounted in said space for movement .
parallel to the walls, switch operators extending
from the actuator through openings in said walls
for operating said groups respectively, spring-ac
tuated detents mounted outside said walls for en
gagement with opposite sides of said actuator
through openings in the walls yieldingly to hold
the actuator in one or more of the positions to
which it is moved, a pin extending transversely
of the actuator through openings in said detents
and said walls, the pin having an abutment out
side each detent, and a compression spring outside each detent, each spring being interposed be
tween one of said abutments and one of said de
tents, said pin being free to move transversely
of the actuato- in said openings, whereby the
thrusts of said springs against said detents are
automatically equalized.
6. An electric switch comprising a frame hav
ing two juxtaposed walls with a space therebe
tween, groups of spring contacts mounted out
side each wall for movement relatively thereto,
an actuator mounted in said space for movement
plates which are offset intermediate their ends
to abut each other at their lower ends and pro
vide a space therebetween at their upper ends,
an actuator mounted in said space to swing par
allel to the plates about a transverse axis, groups
ci spring contacts mounted on the outside of said
plates in offset relation to the vertical plane con
taining said axis, switch operators extending from
the actuator through openings in the plates for
operating said groups, said actuator having a
handle extendinCY upwardly beyond said walls
and a depending tail having recesses in its op
posite sides, rolling detents engageable with said
recesses through openings in the upper ends of
said plates to hold the actuator in different po
sitions, holders for the detents mounted on the
outside of said lower ends, s ld detents and hold
ers being disposed in the region of said plane, a
sleeve extending through openings in said hold
ers and said plates, the sleeve ntting the plate
openings tightly but being loose in the holder
openings, a pin extending through said sleeve
and projecting from each end thereof, the pin
having an abutment beyond each end of the
sleeve, and a compression spring surrounding the
pin outside each holder, each spring being inter
posed between one of said abutments and one oi
parallel to the walls, switch operators extending
said holders, said pin being free to slide length
from the actuator through openings in said walls
for operating said groups respectively, spring-ac 70 wise in said sleeve, whereby the thrusts oi said
springs in said holders are automatically equal
tuated detents mounted outside said walls for en
ized.
gagement with opposite sides of said actuator
WALDO J. KELLEIGH.
through openings in the walls yieidingly to hold
the actuator in one or more of the positions to
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