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Патент USA US2114871

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April 19, 1938.
J. A. CLINTON
2,114,871
ELECTRIC SWITCH
Filed April 15, 1937
2 Sheets-Sheet 2
5
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Patented Apr. 19, 1938
2,114,871
UNITED STATES PATENT OFFICE
2,114,871
ELECTRIC SWITCH
Joseph A. Clinton, Rocky Hill, Conn, assignor to
Colt’s Patent, Fire Arms Manufacturing Com
pany, Hartford, Conn, a corporation of Con
necticut
Application April 15, 1937, Serial No. 137,091
4 Claims.
The invention relates to electric switches, and
more particularly to switches. which include cir
cuit overload protecting means such as fuses.
The principal object of the invention is to pro
vide a switch construction including a casing
therefor wherein there is provided a main cover
which when closed prevents access to the switch
circuit connectors but does permit access to cer
tain other parts of the switch, and on which is
mounted an auxiliary cover openable therewith
and also independently thereof and which carries
an electrical conductor adapted to electrically
connect the switch contacts under certain condi
tions.
From the following speci?cation other objects
and advantages of the invention will be apparent
to those skilled in the art.
In the accompanying drawings I have shown
the embodiment of the invention which I now
deem preferable, but it will be understood that
the drawings are intended for illustrative pur
poses only and are not to be construed as de?n
ing or limiting the scope of the invention, the
claims forming a part- of this specification being
relied upon for that purpose.
In the drawings:
Fig. 1 is a front elevation of a switch embody
ing the principles of the invention.
Fig.2 is a view similar to Fig. l but showing
the auxiliary cover in open position.
Fig. 3 is a view similar to Fig. 1 but showing
both covers in open position.
Fig. 4 is a sectional view taken on the line
4—4 of Fig. 1 with certain parts broken away to
more clearly show the construction.
Fig. 5 is a sectional view taken on the line 5-5
of Fig. 1.
In accordance with the invention a casing is
provided which may be of any desired type and
40 in the drawings I have illustrated the casing
as comprising a channel member I having re
movable side walls 2. The channel and side walls
may be provided with such “knockouts” as may
be considered desirable. I now prefer the form
’ of casing illustrated because it may be incor
porated in a troughing system such as shown in
the patent to Sachs No. 1,758,981 issued May 20,
1930.
In the casing I mount means for supporting
50 the several elements of the switch. An insulat
ing block 3 constitutes such a supporting means
and it is stationarily mounted by screws 4 on a
5
bracket 5 which is in turn secured in the casing.
In the illustrated embodiment I have shown two
identical switches and associated circuits but it
(Cl. 200-114)
should be understood that any number of switches
could be provided and that they could be of iden
tical or different constructions as desired. As my
two switches are identical I will only describe one.
On the block 3 are mounted line and load cir
cuit connectors 6 and 1, respectively, which are
preferably so mounted as to be readily accessible
under certain conditions for connection purposes.
On the block 3 I also mount at least one switch
contact and provide means for electrically con
10
necting this contact with one of the circuit con
nectors. I have shown two switch contacts 8 and
9 mounted on the block and each one is elec
trically connected with a circuit connector. At
least one of the contacts is so positioned that a 15
person would not ordinarily touch it and thereby
receive a shock. In the preferred construction
illustrated both of the contacts 8 and 9 are so
positioned as to eifectively prevent accidental
contact therewith. These contacts are prefer
ably embedded in the block 3 in recesses l0 which 20
open into the surface ll of the block and form
the apertures I2 therein, the contact 8 being se
cured to the block by a screw 13. It should be
noted that these contacts in the preferred con
struction lie behind the plane of the surface I l, 25
and are not only positioned in recesses in the
block but are also aligned with the apertures I2
in the surface II. I do‘not, however, wish to
limit myself to either of these details, the same 30
being merely preferred rather than critical.
A fused type of switch is shown, this being the
form of switch to which the principles of my in
vention are particularly applicable. In accord
ance with the invention the fuse is preferably 35
interposed in the circuit connecting one of the
switch contacts with the load circuit connector
1 and is so positioned as to be accessible for re
placement.
In the drawings I have shown a fuse
receiving means M which is mounted on the block 40
3 to hold a fuse in such a position that it is ac
cessiblc from the front of the casing for replace
ment. A center fuse contact 15, which is screw
threaded, is secured to an angular extension it
on the contact 9 to thereby electrically connect 45
the two and to secure the contact 9 to the base.
The threaded she-l1 contact [4 is connected to the
load circuit connector 'I.
In accordance with the invention an openable
main cover having an aperture therein is pro 50
vided for closing the front of the casing. The
cover is so related to the casing and block 3 that,
when closed, access to the circuit connectors 6 and
l is prevented but access to at least a portion of
the block is permitted. The main cover IT is 55
2
2,114,871
hinged to the casing as indicated at l8 and in
cludes an apertured portion 19. It is apparent
from the drawings, note Figs. 2 and 4 in particu
lar, that I have shown a construction for effec
tively preventing access to the circuit connectors
while permitting access to at least a portion of the
block 3, and more particularly to at least that
portion of the block on which a fuse is adapted to:
be mounted so that the fuse may be replaced
without opening the main cover.
The main cover may be secured in closed posi
tion in various Ways but I have shown a con
struction which I now consider preferable. The
block 3 has a. hole 29 formed therein in which is
15 secured a nut 2!.
The main cover has a hole
therethrough at 22 and a bolt 23 projecting
through the hole for engaging the threads of the
nut 2! constitutes a releasable means for secur
ing the main cover in closed position.
20 may, of course, be omitted if desired.
The bolt
The casing
is also provided with the apertured spring latch
24 which is adapted to project through a hole 25
in the cover when closed.
I provide an auxiliary cover for closing the
25 aperture in the main cover, the auxiliary cover
being mounted on the main cover so as to be
movable to expose the aperture in the latter and
also so as to be movable with the main cover.
The movement of the auxiliary cover with re
spect to the main cover may be of any desired
type, but this will be dependent upon other de
tails of construction. In the illustrated and now
preferred form of the invention, an auxiliary
cover 26 is hinged to the main cover at 21 and
35 includes an offset or domed portion 28. The
auxiliary cover 26 is larger than the aperture
in the main cover and, therefore, when closed
serves to- not only cover the aperture but to also
cover the main cover securing bolt 23. The main
40 cover is preferably o?set at 29 to permit the edges
of the auxiliary‘ cover to lie flush with the outer
surface of the main cover and may be apertured
.as at 30 to receive a spring latch 31 on the aux
iliary cover. It is apparent that the two covers I‘!
45 and 26 will move as a unit when the main cover
is opened. A handle, such as shown at 32 may
be provided on the auxiliary cover.
The auxiliary cover has mounted thereon, and
insulated therefrom, an electrical conductor
which projects rearward therefrom. This con
ductor is so positioned and dimensioned that it
electrically connects the switch contacts in the
casing when both the main and auxiliary covers
are closed and is electrically disconnected from
at least one of them when either the main or
auxiliary cover is open.
In the embodiment
shown an electrical conductor 33 is secured to
the auxiliary cover 26 by means of an insulating
block 34 which is secured to the offset portion
60 28 of the cover. In the illustrated form, the
switch contacts 8 and 9 are mounted in sepa
' rate recesses in the block 3 and the conductor 33
is accordingly provided with two legs 35 which
are adapted to project through the apertures l2
in the surface I I of the block to electrically con
nect the switch contacts.
The ends of the switch contacts 8 and 9 and
the legs 35 are preferably beveled to provide co—
operating cam surfaces 36 and 31 for .assuring
70 the proper engagement of these members when
the conductor legs 35 are being moved into en
gagement with the switch contacts.
In using my device, either or both of the covers
may be sealed shut by padlocks, for example, se
75 cured to the latch 24 and rings 38, and the main
cover may, if desired, be additionally fastened
by the bolt 23.
The particular fused switch shown is adapted
for use with a three wire system and for this
reason I have shown a solid neutral 39 mounted 5
on the block 3.
The operation of the device illustrated will now
be described, assuming ?rst that the switch is
suitably mounted and properly connected in an
electrical circuit. If the auxiliary cover is sealed 10
in closed position, the seal is ?rst removed. By
means of the handle 32 the auxiliary cover 26
may now be moved to open position and while
being so moved the conductor 33 is moved out
of engagement with the switch contacts 8 and 9 15
to thereby electrically disconnect them. As the
contacts 8 and 9 are positioned behind the sur
face ll there is little or no danger of accidentally
touching these contacts. Also with just the aux
iliary cover open no access may be had to the g0
circuit connectors 6 and ‘I. The connector 1‘ is
preferably connected to the load side of the cir
cuit and consequently with the auxiliary cover
open so as to expose the fuse for replacement
the fuse contacts l4 and I5 are electrically dead. 25
The fuse may now be replaced without danger
of shock to the person so replacing it. The
auxiliary cover may now be closed, movement
of the conductor 33 being simultaneously effected
to electrically connect the switch contacts 8 and 30
9. If access to the circuit connectors 6 and ‘I
is desired for any reason, the main cover may be
opened after ?rst releasing the latch 24, or if a
bolt 23 is used it must be removed; in either case,
it is apparent that the switch contacts 8 and 9\‘ 35
will be electrically disconnected when the main,‘
cover is open to expose the circuit connectors.
It is of course obvious that various changes in
details of construction within the scope of the
invention will be apparent to those skilled in the 40
art.
What I claim is:
'
i. The combination in a fused electric switch,
of a casing, an insulating block stationarily
mounted within the casing .and having a front 4,5
surface, an openable main cover for the casing
having an opening therein, the edges of the open
ing substantially ?tting the block and the cover
thus cooperating with the block to entirely close
the casing with only the front face of the block 50
exposed, line and load circuit connectors mount
ed on the block behind the cover, two switch con
tacts mounted on the block behind the front sur
face thereof so as to be substantially protected
thereby from being accidentally touched, one of 55
said contacts being electrically connected with
in the casing with one circuit connector, fuse re
ceiving contacts mounted on the block adjacent
the front surface thereof so as to be accessible
through the cover opening for fuse replacement, 60
the said fuse contacts being electrically con
nected within the casing with said other switch
contact and with the other circuit connector re
spectively, an openable auxiliary cover mounted
to be movable with the main cover and normally 65
serving to close the opening therein and to cover
said exposed front surface of the block, and an
electrical conducting member carried by the aux
iliary cover and insulated therefrom and. being
so formed and positioned as to engage and elec- 70
trically connect the switch contacts when the
auxiliary cover is closed and to electrically dis
connect said contacts when either the main or
auxiliary cover is open.
2. The combination in a fused electric switch, 75
3
2,114,871
of a casing, an insulating block stationarily
mounted within the casing and having a front
surface with at least one relatively small aperture
therein, an openable main cover for the casing
having an opening therein, the edges of the open
ing substantially ?tting the block and the cover
thus cooperating with the block to entirely close
the casing with only the front face of the block
exposed, line and load circuit connectors mounted
10 on the block behind the cover, a switch contact
mounted on the block behind the front surface
thereof in alignment with said aperture therein
so as to be substantially protected from being
accidentally touched, said contact being electri
15 cally connected within the casing with the line
circuit connector, a second switch contact mount
ed on said block, fuse receiving contacts mounted
on the block adjacent the front surface thereof so
as to be accessible through the cover opening for
fuse replacement, the said fuse contacts being
electrically connected within the casing with said
second switch contact and with the load circuit
connector respectively, an openable auxiliary
cover mounted to be movable with the main cover
25 and normally serving to close the opening therein
and to cover said exposed front surface of the
block, and an electrical conducting member car
ried by the auxiliary cover and insulated there
from and being so formed and positioned as to
80 engage and electrically connect the switch con
tacts when the auxiliary cover is closed and to
electrically disconnect said contacts when either
the main or auxiliary cover is open.
3. In combination, a casing, an insulating block
cuit connectors, said means including a fuse re
ceiving device mounted on said block, an open
able main cover for closing the front of the eas
ing, said cover including an apertured portion so
positioned with respect to- said block that when
the cover is closed access through the front of
the casing may be had to said fuse receiving de
vice for fuse replacement but not to the circuit
connectors, releasable means for securing the
main cover in closed position, and an openable 10
auxiliary cover for closing the aperture in the
main cover and for covering the main cover se
curing means, said auxiliary cover including
means by which it may be secured in closed posi
tion against unauthorized opening.
15
4. In combination, a casing, an insulating block
stationarily mounted within the casing, circuit
connectors mounted on said block, at least one
pair of switch contacts mounted on said block so
as to be substantially protected from being ac~ 20
cidentally touched, a switching member movable
to electrically connect and disconnect said pair
of switch contacts, means for electrically con
necting one switch contact with one of said cir
cuit connectors, said means including a fuse re 25
ceiving device mounted on said block, an open
able main cover for closing the front of the cas
ing, said cover including an apertured portion so
positioned with respect to said block that when
the cover is closed access through the front of 30
the casing may be had to said fuse receiving de
vice for fuse replacement but not to the circuit
connectors, releasable means for securing the
main cover in closed position, and an openable
stationarily mounted within the casing, circuit
auxiliary cover for closing the aperture in the 35
connectors mounted on said block, at least one
pair of switch contacts mounted on said block so
as to be substantially protected from being ac
cidentally touched, a switching member movable
main cover and for covering the main cover se~
40 to electrically connect and disconnect said pair
of switch contacts, means for electrically con
necting one switch contact with one of said cir
curing means, said means and auxiliary covers
including cooperating means by which they may
be secured together to prevent unauthorized rela
40
tive movement thereof.
JOSEPH A. CLINTON.
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