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Патент USA US2412494

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Dec. 10, 1946.
l
.
T. M. COLE
2,412,494
ELECTRIC SWITCH
Filed June 8, 1943
3 Sheets-Sheet l
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THQ/VA s M. COLE
:inventor
(Ittorneg
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Dec. 1o, 1946.
_
T, M, COLE
2,412,494
ELECTRIC SWITCH
Filed June 8, 1943
3 Sheets-Sheet 2l
77/0/‘7/15 M. CÚLE
ßlwentor
Gttorncg
Dec. 10, 1946.
2,412,494
T. M. COLE
ELECTRIC SWITCH
Filed June. 8, 1945
5 Sheets-Sheet 3
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THOMAS /‘7- COLE
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3nnentor
(Ittorneg
Patented Dec. 10, 1946
2,412,494
UNITED STATES PATENT OFFICE
2,412,494
ELECTRIC SWITCH
Thomas M. Cole, New York, N. Y., assigner to
Cole Industries, Inc., Long Island City, N. Y., a
corporation
Application .lune 8, 1943, Serial No. 490,019
s Claims.
(Cl. 20G-50)
1
This invention relates to electric switches.
One object of the present invention is to pro~
2
ing open and the casing-cover being in its open
position;
mally prevents the switch casing-cover from be
Fig. 2 is a side view of the switch, showing the
position of the operating handle in the open con
ing opened when the switch is closed and which
prevents the switch from being closed when the
ted;
vide a switch with an interlock device which nor
switch casing-cover is open, but which can be
released to permit the switch casing-cover to be
opened while the switch is closed. In this con
nection, it will be understood that it is sometimes ‘
necessary to obtain access to the interior of the
switch casing without opening the switch, and
it will be understood further that in accordance
with this object of the invention, the interlock
device while normally operative to prevent the
switch casing-cover from being opened when the
switch is closed is so constituted as to enable
those familiar with the construction of the inter
lock device to release the switch casing-cover
while the switch is closed, while on the other
hand, the switch casing-cover is locked in closed
position when’ the switch is closed, so that those
dition of the switch, the casing-cover being omit
-
Fig. 3 is a sectional view on the line 3~-3 of
Fig. 1;
Fig. 4 is a fragmentary front view of the switch,
the casing-cover being in closed position and the
operating handle being in switch-open position;
Fig. 5 is a sectional view on the line 5-5 of
Fig. 1;
Fig. 6 is a sectional view on the line 6-6 of
Fig. 5;
Fig. 7 is a sectional view on the line 1_1 of
Fig. 5;
Fig. 8 is a sectional View on the line 8_8 of
Fig. 3;
Fig. 9 is a view similar to Fig. 8, the cover being
in closed position;
Fig. 10 is a View similar to Fig. 8, the cover
being in closed position and the handle being in
switch-closed position and the interlock device
cover without first opening the switch.
25 being in its normal position for preventing the
opening of the switch casing-cover;
Another object of the invention is to provide
Fig. 1l is a View similar to Fig. 10, illustrating
an interlock device which is associated more or
the release of the interlock device to permit the
less directly with the operating handle of the
switch casing-cover to be opened while the switch
switch in such manner as to prevent actuation of
unfamiliar with the construction or operation of
the interlocking devices are not able to open the
said handle.
More particularly, in accordance '
with the present invention, the interlock device
acts more or less directly upon the handle to
is closed;
Fig. 12 is a sectional View on the line l2-l2 of
Fig. 3, the switch being opened;
Fig. 13 is a View similar to Fig. 12, the switch
prevent opening of the switch casing-cover when
being closed;
the switch is closed and to prevent closing of the
switch when the switch casing-cover is opened, 35 Fig. 14 is a sectional view on the line M-I?ä
of Fig. 1;
thus eliminating one of the objections to prior
interlocking -devices in which the latter are as
sociated more or less directly with the switch op
erating mechanism, with the disadvantage that
such mechanism is partially actuated and apt
to be impaired when attempts are made to close
the switch while the casing-cover .is open or to
open the casing-cover when the switch is closed.
A further object of the invention is the provi
sion of an improved quick-make and quick-break
switch operating mechanism.
The above and other objects, features and ad
vantages of the present invention will be fully
understood from the following description con
sidere‘d in connection with the accompanying
illustrative drawings.
Fig. 15 is a rear view, in elevation, of the in
sulation block which carries the stationary con
tact members of the switch;
Fig. 16 is a detail sectional view on the line
lli-I5 of Fig. 1 showing the bearing for one end
of the switch operating rod;
Fig. 17 is a side View of an insulation disk car
rying a movable contact member of another form;
Fig. 18 is a sectional view on the line IS--IS of
Fig. 17;
Fig. 19 is an edge view of the insulation disk
and movable contact member shown in Fig. 1'?.
Referring now to the drawings in detail, the
electric switch embodying the present invention
comprises a casing Ill which houses the switch
In the drawings:
contact members and the switch-operating mech
anism. More particularly, the switch proper
Fig. 1 is a front View, in elevation, of a switch
comprises an insulation block l2 in which are
embodying the present invention, the switch be» 235 mounted a plurality of sets of stationary con
2,412,494
3
A
tact members It, léa (Fig. 15), there being a
companion movable contact member` i6 which, in
the closed position of the switch, illustrated in
Fig. 3, engages between the companion stationary
in open position, detent 65 being projected in re
cess 68 prevents movement oi the operating mem
ber 3l] for closing the switch, said movement of
contact members i4 and Isla. The movable con
tact member i6 is carried by an insulation disk
I8 mounted on the iiat operating rod 20, so as
to be turnable with said rod about the longitudi
nal axis of the latter whereby turning movement
of said rod about its longitudinal axis in oppo
site directions opens and closes the switch. Said
rod is mounted at its opposite ends in bearings
operating member 3d for closing the switch being
in a counter-clockwise position viewing Fig. 8.
In order to permit .the switch to be closed, it is
necessary to move member 68 from the position
illustrated in Fig. 8 to the position illustrated in
Fig. 9, whereby to retract or disengage detent St
from holding relation with operating member 33.
This is accomplished automatically when the cas
ing-cover “Si”, which is hinged on the switch cas
ing as indicated at ld, is closed. The manner
in which this is `acconmlished Will now be de
switch casing lil. The switch'proper is of sub 15 scribed. The arm 'i6 of interlock member @il is
stantially the same construction as that dis
provided with an open-end slot lil and a detent
closed in United States Letters l’atent No.
portion Si?. The interlock device comprises a
2,289.219, and therefore requires no further de»
member 82 illustrated in detail in Figs. 5 to '7.
scription. It will be noted that, as in said pat
As here shown said member 82 comprises the
ent, the bearing members 22 and 24 for the oppo
are s 8d and 85 and is pivotally mount-ed on the
22 and 24 which are secured in any suitable way,
as by welding the same to the bottom 26 of the
site ends of operating rod 2l) are provided with
knife edge bearings 28 as shown in Fig. 16 in
inner surface oi casing-cover 'i2' by the pin-like
reference to bearing member 22, it being under
extensions 53 which are engaged in the bearing
portions Sii of the holding or bearing member S2
stood that bearing member 2@ is likewise pro
vided with said knife edge bearings 28, as illus
trated in said patent.
which is secured to the inner surface of cover ‘l2
in any suitable way as by a screw 9d. As-shown
Referring now more particularly to the oper~
in Fig. 6, arm Sil is provided with an opening 9S.
Upon the closing oi cover l2, when the parts are
in the position illustrated in Fig. 9, the switch
ating mechanism, for actuating rod 2t for'open
ing and closing the switch, said operating mech
being open, :the edge 88 of arm 3iè- engages arm
anism comprises an operating member 33` which 30 'it of member 6% in slot ’i3 thereof and thereby
is pivotally mounted adjacent the inner surface
swings said arm in a Vclockwise direction, viewing
of the side wall 32 of the switch casing on a pivot
Figs. S to 10, thereby moving arm tél of member
pin 3&3. Said operating member 3@ comprises the
Sil from the position illustrated in Fig. S to the
disk-like p-art 35 and the radially extending han
position illustrated in Fig. Y9, thus releasing de
dle part 33 which is preferably integral with part
tent ët from operating member St and thereby
35. As illustrated in Fig. 8, a plate @il is fixed
freeing said operating member for movement to
to rod 2€) and is connected to operating member
the switch-closing position illustrated in Fig. 10.
3U by a link d2, one end of said link being pivot
ally connected to plate di] by the pin Afl, _and
At the same rtime, hook or detent t@ of arm l5
engages the interlock member t2 in the opening
the other end of said link having a slot QS in 40 Qt of arm álll‘ of said interlock member, and thus
which a pin ¿i8 carried byoperating member 3B
is engaged. Plate ¿iii is provided with ?an arm 50
which Vis connected to a spring projected rod 52,
said arm 5t being provided with a slot 5L! in which
one end of said rod is pivotallyV engaged, the other
end of said rod being slidable in a bracket 55
secured to side wall 32 of the casing. The spring
for projecting rod 52 and for opposing the move
prevents the casing-cover l2 from being opened
while the switch is ciosed. It will be noted by
reference to Fig. 9 «that when the switch is open,
the casing cover can be moved to open position
because although detent Sil is engaged in open
ing Bt oí detent member 32, detent member 65
can be movedV in a counter-clockwisedirection by
the engagement of the inner edge St of member
ment of said rod is indicated at 58, one end of
Sù with 'the vbevelled edge itil? of detent Bü of
said spring bearing on bracket 55, and the other 50 member til, since the open side of recess Yt8 of
end of said spring bearing on the end oi the rod
member âë is opposite' detent 5t of interlock
which is connected to arm 5@ of plate di). It
member @il When, however, `the switch is closed
will be observed that plate êß and spring pro
as illustrated in Fig. 10, detent member St can
jected rod 52 constitute a toggle which is over
not be moved in a counter~clockwise direction,
centered by the operation of operating member
since recess S8 is out of registry with detent mem
3@ and that said toggle together with said oper
ber @t of interlock member 6@ and said detent
ating member provides a quick-make and a quick
member is opposed or engaged by the peripheral
break mechanism for the switch. Slot 4t in
edge of disk portion ät of operating member 3d.
member Q2 permits ,the toggle to operate with a
As hereinbefore indicated a specialfeature of
snap action independently of handle 3S after said
the
present invention >resides in making provi
toggle is overcentered in either direction by op 60 sion to enable the casing-cover to be opened while
eration of said handle.
The interlock device comprises a member Si)
(Figs. 8 to 11) here shown as a bell crank lever
pivotally mounted adjacent casing wall 32 on va
pivot pin S2 iixed to said Wall. One arm Eli oi'
member Eil is provided with a hooked end or de
tent portion 66 which is engageable in a recess
@3 provided in the peripheral edge of disk part
et of operating memb-er 38.
Said detent tß'is _
held in said recess by a tension spring ’líì which
is secured at its opposite ends to casing wall 32
and to arm tilt, respectively. It will be noted that
in the position of the parts illustrated in Fig. 8,
the switch being open and the casing-cover being
the switch is closed so that those familiar with
the construction of the interlock device may open
the casing-cover without Vopening the switch.
For this purpose, the interlock member is pivot
ally mounted as described above and provision is
made for access to said interlock member S2
through the closed cover for moving ‘the same to
cover-releasing position in relation to interlock
member 6G. For this purpose an opening lüi iS
provided in the ñange portion It?V and an open
ing lll@ is provided in the upper edge of casing
Wall 32, said openings being in alignment when
the casing-cover is closed. Accordingly, when
it is desired to open the casing-cover without
2,412,494
5
6
opening the switch, a pin or a key can be insert-ed
the same in a counter-clockwise direction (view
sulation block is removably secured to member
|32. The end portions |43 are secured to casing
wall 26 in any suitable way as by spot welding
said end portions |40 to said casing wall. It will
ing F’igs. 10 and 11) from the position illustrated
in Fig. 10 to the position illustrated in Fig. l1,
out of engagement with detent Bil, thus freeing
be understood that as illustrated in Fig. 15 and
as shown in the above mentioned patent, the
insulation block is open at its rear so that it can
through openings |04 and IDI to engage arm
84 of interlock member 82 for pivotally moving
said interlock member 82 from detent 8B so that
the casing-cover can be opened while the switch
remains closed. A spring |06 is secured to the
inner surface of the casing-cover in any suitable
way as by a screw |08 and bears on arm 8S of
interlock member |32l for holding said interlock
member in the normal position thereof illustrated
in Figs. 5 to ’7 and for resiliently opposing the
movement of said interlock member for releas
ing arm 84 thereof from the detent 8S of the
companion interlock member 60. It will be noted
that if the switch is closed and the casing cover
be removed from the casing without removing
operating rod 25 or the movable contact members
carried thereby. Said rod extends through said
block and is normally positioned in the open-end
recesses M2 which are provided in the opposite
end walls lili of said block.
As shown in the drawings, the cover is provided
with a marginal cut-out portion |46 to expose an
upper edge portion of disk part 36 of operating
member @il and to allow movement of the han
dle part 3S of said operating member. The cas
The angle between arm 84 and 86 is less than
ing is provided with ledge portions |48 and |50
which are engaged by opposite edges of handle
part 3S in the closed and opened positions, re
spectively, of the switch. Said casing parts |48
and i553 are provided with extensions |52 and
i515 which together with the forwardly project
ing part |55 of the casing form a slot in which
handle part 33 is movable. Said handle part
90° so that when the cover is moved to its closed
may be provided with an opening |58 and said
positions for engaging interlock member 82 with
interlock member 60, the edge 98 of arm 84 en
casing part E55 may be provided with openings
i513 and S52 to permit the handle part 38 of the
gages the inclined edge ||0 of arm 1S of mem- ,
operating member @il to be locked open or closed
by
of a lock, not shown.
is in open position, said cover can be readily
closed merely by moving the same to closed posi
tion since the interlock member can move on its
pivot over the datent Se to position edge es of
arm 84 in slot 18 ofk arm 75 of interlock mem
ber 60.
ber Gil, without said arm 34 being turned on its
pivot by said engagement of said edge of the
arm with said edge H0 of member 58. Further
by reference to Figs. 1, 2, and 8, it will be noted
that
the open condition of the switch, detent ;»
3Q is out of the path of arm 84 of interlock mem
ber 82 so that when the casing-cover is closed,
edge 93 of said interlock member 82 ñrst engages
edge | |ii of interlock member ‘Bü and thereby
moves the latter in a clockwise direction, view- l
ing Fig. 8 for entering detent 80 in opening 95
of interlock member 82.
As here shown, a movable latch ||2 is prefer
ably provided for holding the cover 'I2 releasably
in closed position. Said latch is pivotally mount
ed adjacent the inner surface of the end wall
lift of the casing by means of a pivot pin |15.
The casing-cover is provided with a slot ||8
through which said latch projects when the cover
is closed, said latch having a recess |23 in which 50
the wall portion |22 of the cover at one end of
In Figures i7 to 19 there is illustrated a mov
able contact member of a form which differs from
the construction illustrated in Fig. 12 and in the
above mentioned Patent No. 2,289,219. As here
shown, thel movable contact member lëA is U
shaped
is iixed to the insulation disk IEA
by a rivet
the end E12 of said U-shaped con
tact member being received in a recess llt pro
vided in the edge of disk |8A s0 that said U
shaped member cannot turn on said rivet. The
free arm portions il@ oi contact member IEA
are bent outwardly and thereby spaced from the
adjacent surfaces of disk |8A. A U-shaped steel
spring member E'ie abuts the outer surfaces of
the U-shaped spring member for resiliently op
posing the spreading oi portions l‘l‘ti of contact
member icA and for holding them firmly in good
electrical engagement with the stationary con
tact members. Spring member |18 is secured in
position by the rivet Ilû by which the movable
slot i it is engaged. Said latch is held releasably
contact member is fastened to disk ISA. Tongues
in position to retain the cover in closed position
¿.353 are struck inwardly from spring member l'lß
by means of a spring |24 which is coiled around
and engage the sides of movable contact mem
pin H5. One end of spring |24 engages a pin
ber ¿5A
small apertures provided therein as
|25 iîxed to casing wall lill and the other end
illustrated in Fig. 18. In this form of the switch,
of said spring engages latch ||2 in an opening
the companion stationary contact member lll’
|28 formed in said latch. Said latch is provided
and ita" which correspond to the Contact mem
with an upper inclined edge portion |38 which
bers lâ and iii-ci, respectively, (Fig. l5) are re
is engaged by the edge |22 of the cover at the 60 ceived between the arms il@ and the adjacent
slot H3 for moving said latch in a clockwise di
sides of disk I3, respectively; in other words,
rection, viewing Fig. 3, during the closing of the
when the switch is closed, the arms l‘iß of the
cover 'l2 to permit said cover to be closed. When
movable contact member VSA engage over the
the cover is closed and the switch is opened, latch
outer surfaces of the companion stationary con
member H2 is moved in a clockwise direction,
tact members le; and ita’ instead of being re
viewing Fig. 3 in order to release the cover so
ceived between said contact members as in the
that the latter can be moved to its open posi
case of the movable contact member iii and the
tion.
companion stationary members lli and Mia illus
As illustrated in Figs. 1, 3 and 12 to 14, the in
trated lin Figs. 12, 13 and 15. t will be under
sulation block I2 which carries the stationary
stood that the insulation disk itiA is mounted
on the rod 2S and that in all other respects the
contact members of the switch is secured to a
assembly of the switch including the modiñed
plate |32 which has a raised intermediate portion
|34 to provide a space |36 between the inner sur
iorm of switch Contact members illustrated in
face of casing wall 26 and said raised portion |36
Figs. i? to i9 is the same as that described above
with reference to Figs. 12, 13 and 15. Further it
for the ends of the screws |38 by which said in
2,412,494
7
‘will be noted by reference to Fig. 18 that the ends
E32 of the stationary contact members are re
flexed toward each other so as to more easily
enter into engagement with the companion arms
H6 of the movable contact member iSA.
8
normally engages said other interlock member in
said opening to prevent said cover from being
opened to a position in which it releases said
other interlock member to permit the casing
cover to be opened, said other part of said other
interlock member engaging said cover and there
by limiting pivotal movement of said other inter
While I have shown and described the preferred
embodiment of my invention, it will be under
stood that the latter may be embodied otherwise
lock member in one direction, said other part en
than as herein specifically illustrated or described,
gaging said cover in the position of said other
and that in the illustrated embodiment certain 10 interlock member in which it is interlocked with
changes in the details of construction and in the
said casing-carried interlock member, and means
arrangement of parts may be made without de
provided in a part of said operating means en
parting from the underlying idea of this inven
gageable with said casing-carried interlock mem
tion. Also it will be understood that one or more
ber for preventing movement of the latter to its
features of my invention may be used without 15 releasing position when the switch is closed, said
using the other features thereof. Accordingly, as
cover-carried interlock member being pivotally
these and other changes may be made in -the
movable from said position in which it is nor
switch disclosed herein as the presently preferred
mally engaged by said casing-carried interlock
member when the switch is closed and the cover
embodiment of my invention, I do not wish to be
limited to the invention as speciñcally shown or 20 is in closed position to a position in which it is re
described except to the extent which may be re
leased from said casing-carried interlock member
quired by the scope of the appended claims.
Having thus described my invention, what I
claim and desire to secure by Letters Patent ist
while the switch remains closed, said interlock
members being positioned in said casing and Said
said cover-carried interlock member being piv
switch, and an interlock between said operating
means and said casing-cover comprising an inter
lock member pivotally mounted on said casing,
said interlock member comprising a bell crank
lever having one arm thereof provided with a de
casing-cover providing access to said cover-car
l. In a switch having a casing provided with a 25 ried interlock member, when the cover is closed,
cover movable from a closed position to an open
for moving the cover-carried interlock member
to said last mentioned position thereof.
position and means for operating the switch, an
3. A switch having a casing provided with a
interlock between said cover and a part of said
cover movable from a closed position to an open
switch-operating means, said interlock compris
ing an interlock member carried by said cover, 30 position, means for opening and closing the
otally mounted on said cover and having a part
provided with an opening, an interlock member
carried by said casing in position to engage said
cover-carried interlock member in said opening,
said casing-carried interlock member being piv
otally mounted on the casing and pivotally mov
tent, said operating mechanism comprising an
operating member mounted for pivotal movement
able from a position in which it normally engages
and provided with a recess in which said detent is
said other pivotally movable interlock member
engageable for preventing pivotal movement of
to prevent said cover from being opened to a posi 40 said operating member, a companion interlock
member pivotally mounted on said cover and hav
tion in which it releases said other interlock
ing two arms disposed at an angle of less than
member to permit the casing-cover to be opened,
90“, one of said arms having an opening and
and means provided in a part of said operating
being positioned to engage the other arm of said
means engageable with said casing-carried inter
45 bell crank lever and the other of said arms being
lock member for preventing movement of the lat
positioned to engage the cover for holding said
ter to its releasing position when the switch is
one of the arms in operative engagement with the
closed, said cover-carried interlock member being
other arm of the bell crank lever, the other arm
pivotally movable from said position in which it
of said bell crank lever having a detent releas
is normally engaged by said casing-carried inter
lock member when the switch is closed _and the 50 ably engageable with said companion interlock
member in said opening to hold the casing cover
cover is in c_losed position to a position in which
closed, said bell crank lever being released from
it is released from said casing-carried interlock
member while the switch remains closed;
2. In a switch having a casing provided with a
cover movable from a closed position to an open
position and means for operating the switch, an
interlock between said cover and a part of said
said companion interlock member when said iirst
mentioned detent engages said operating member
in said recess whereby said casing Vcover can be
moved to open position and said operating mem
ber is held against movement to switch-closing
position when said cover is in said open position,
switch-operating means, said interlock compris
and said operating member having a part en
ing an interlock member carried by said cover
and pivotally mounted thereon, an interlock 60 gageable with said ñrst mentioned interlock
member to prevent movement thereof for releas
member carried by said casing and pivotally
ing the companion interlock member when said
mounted thereon in position to engage said cover
operating member is in the switch-closed posi
carried interlock member, said casing-carried in
terlock member having a detent at one end there
of and said cover-carried interlock member hav
ing a part provided with an opening and another
.part in angular relation to said iirst mentioned
part, said casing-carried interlock member being
movable from a position in which said detent 70
tion thereof, said interlock member being releas
able in the closed condition of the switch by piv
otal movement of said companion interlock mem
ber for withdrawing said one arm thereof from
said engagement by said detent.
THOMAS M. COLE.
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