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Патент USA US2119809

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June 7, 1938. '
A. E. GRANT
2,1 19,809
ELECTRIC PLUG
Filed sept. 50, 1955
'15
2 Sheets-Sheet 1
15
June 7, 1938.
\A. E. GRANT '
2,1 19,809
ELECTRIC PLUG
Filed ‘Sept. 30, 1935
2 Sheets-Sheet 2
} 1,119,809
Patented June 7, 1938
UNITED STATES
‘FATE
2,119,809
ELECTRIC PLUG
Albert E. Grant, New York, N. Y., assignor a
nine-twentieths to Branch P. Kerioot and
two-twentieths to Merwin F. Ashley, both of‘
New York, N. Y.
Application September 30, 1935, Serial No. 42,762
9 Claims.
My invention relates to wiring devices and more
particularly to devices commonly known as heater
plugs which are employed. to connect current
supply wires in circuit with electric heating ap
pliances such as sadirons, waflle irons, bread
toasters, etc.
Heretofore plugs of this character have usually
embodied a casing formed of a plurality of ‘co
mating parts secured together by means of
screws, bolts, or other metallic fastening devices.
A principal object of my invention is to provide
an improved heater plug in which the molded
insulated casing is in onev piece.
Another principal object of my invention is to
15 provide an improved heater plug embodying a
switch, the actuator for the switch being con
veniently located adjacent a shoulder of the eas
ing at the end of the plug opposite the contact
terminals.
A further object consists in providing an im
20
proved plug of this character in which the sev
eral parts are compactly and conveniently ar
ranged in combination to facilitate assembly and
to obtain a sturdy and well insulated devicefor
25 the purpose. Other and further objects will ap
pear from the following speci?cation.
Referring to the drawings which form a part
hereof,
-
Figure 1 is a side elevation of a heater plug
30 embodying the features of my invention.
Figure 2 is an edge elevation of the device.
Figure 3 is a cross sectional view taken on line
3—3 of Figure 2.
Figure 4 is a cross sectional view taken on line
35 4-4 of Figure 3.
Figure 5 is an elevation of the interior sub
'
.>
the-casing wall at 20 ‘serves to accommodate the
outwardly extending actuating lever arm 5| of an
internal switch. The lower end wall ofthe cas
ing is apertured at 2I-v-2l to receive the contact
prongs of an appliancewith which it may be. de
sired’ to make connection and the interiorv walls
of the casing are molded to provide suitable shoul
ders and abutments for positioning and retaining
the internal parts of the device. Thus formed,
the housing is readily molded in one piece and is
of a conveniently handy size and shape.
'
The interior parts of the device constitute a
sub-assembly 25 (see Figure '5), the combined
elements of which are adapted to be dropped into
the casing and to closely ?t therein. The as
sembly comprises a molded block 26 of insulat
ing material, such as porcelain, to the lower end
of which contact clips Hand 28, spacedto reg
ister with the openings 2!, are, respectively ‘se
cured by the eyelets 29 and 3t. One jaw member
of the clip 21 is extended above the eyelet 29
and carries a binding screw 3] to which one of, the 25
current supply wires 32 may be connected. A
binding screw 33 for the other supply. wire is
carried on the opposite side of the block by a
conductor piece 3d which, in turn, is a?ixed. to
the block by means of an eyelet 35.
_,
V
cured in position and held against clip 28 by
means of the eyelet_30.
with the wire guard retained thereby.
,
Figure 8 is a plan view of the closure shown in
Figure 7.
~
‘
>
Figure 9 is‘ a cross sectional view of the molded
insulated housing, and
Figure '10 is a plan view thereof.
30
The conductor piece 34 is extended into a
recess formed in one side of the block at 36 and
is there angularly bent to afford a switch con
tact 40. A similarly shaped-contact M is car
ried on the opposite side of the block and is 35
integral with a conductor piece 42 which is se
assembly of the device comprising the insulating
40 shown in Figure 5.
Figure 7 is an elevational view of the resilient
closure for the upper end of the casing together
50
’
A slot extending downwardly from the top of
block conductors, switch and contacts.
Figure 6 is a plan view of the sub-assembly _
425
on'opposite sides of the casing forengagement by
the spring metal closurecap 60.
These switch contacts 40 V
and 4!} are adapted to be bridged by the swinging
switchvmember 45.
40
_
From the foregoing it willftbe obvious that one
side of the circuit through the plug is carried
through the lead-in wire'32 directly to the clip
contact 21 and that‘ the circuit on the other side
of ’ the plug traverses the conductor piece 34, 45
switch’member .45 and thence through conductor
piece 42 to the other clip contact 28.
p The upper margin of the recess 36in the block
I
The insulating casing l5 consists of a deep
molded shell of plastic composition having edge
?anges l6 and side ?anges I‘! adjacent its top.
The edge ?anges are formed to provide a manual
grip useful in withdrawing the plug to disconnect
55 it and the side ?anges de?ne shoulders 18-48
de?nes an arm 41; the outer end of which is per
forate to retain a long eyelet 48 in which the 50
bridging switch member 45 is free to swivel 'in
making and breaking contact with the contacts
46
and
AI.
'
~
'
‘
'
7'
The swinging switch member 45 is a substan
tially rectangular band of conducting ‘metal, the 55
2
2,119,809
upper side of which extends through the eyelet
48 and the lower side of which is formed to pro
vide an inwardly extending lug 45’ to retainone
end of the coil spring 49. The other end of the
switch spring is securely anchored to the short
arm of the actuating lever 50 which is fulcrumed
on eyelet 48, the long arm 50’ of the lever ex
tending outwardly in position to register with the
slot 20 in the housing.
10
In Figures 3, 4 and 5 the switch is shown in
conducting position, the “off” position of the
switch being shown in the broken lines in Figure
3. The operation of the switch is very positive
and its action is instantaneous. When the
15 knurled end of the actuator arm 50’ is elevated,
the spring is compressed and moved outwardly
until its axis is parallel with the sides of switch
member 45. Immediately the spring is carried
past center it re-expands, swiveling the switch
20 member into the position shown in dotted lines
of Figure 3, and breaking the circuit between
the contacts. Reverse movement of the actuator
operates to snap the switch member into bridging
position in the same manner.
25
_
The switch movement is a usual one and no
claim is made to the switch construction beyond
its location in respect to the one piece casing
and its relation to the other parts of the device.
The remaining assembly comprises the spring
30 metal closure cap 60 and the helical wire guard
65. The cap consists of a stamping having a
hole formed therethrough at El to thread over
the wire guard and the supply wires 32, the mar
gins 62 of the hole being bossed. The long
35 edge on one side of the cap is ?anged inwardly
at 63 and the opposite edge is provided with
an inward bead 64 adapted to engage under
the shoulders it of the casing shell. The wire
guard is of conventional construction and its
40 larger convolutions are extended through the
hole 6| under the boss 62.
To wire the device, the wire guard and closure
cap are ?rst threaded over the current supply
wires. The ends of the wires are then respec
45 tively secured under the binding screws, the
adjacent portions of the wires being laid in the
strain relieving grooves 25' formed in the block.
The entire assembly 25 is then dropped into the
casing andthe inward ?ange B3 of the cap is
50 hooked under one of the casing shoulders it.
Using this abutment of parts as a fulcrum, the
cap is hinged over the top of the casing until
the cap bead 64 snaps into engagement under
the opposite casing shoulder. During this move
55 ment, the larger convolutions of the spring wire
guard on the under side of the cap are com
pressed against the top of the block, thereby
tending to lift the cap and holding the cap bead
and ?ange securely against the casing shoulders.
To take down the assembly, it is only neces
sary to lift the bead of the cap from under the
casing shoulder, whereupon the cap may be
swung off and the assembly 25 may be freely re
moved.
65
Constructed and assembled as above set forth,
I have found the device affords superior insula
tion and long wear. The location of the switch
lever has proved most convenient and the sturdy
assembly of the parts is simple and inexpensive
70
to effect.
5
Having thus described my invention, I claim:
1. A heater plug comprising a deep molded
casing of insulating material having exterior
shoulders formed on its opposite sides adjacent
75 its top, a closure cap of resilient metal adapted
to ?t over the top of the casing and havingin
wardly extending edge portions adapted to en
gage said shoulders, conducting means carried
within the casing, contacts connected with said
conducting means, said cap being perforate to
admit current supply wires for connection to said _
means, and resilient means exerting an upward
pressure on said cap to hold the edge portions!
thereof in engagement with said shoulders, said
resilient means comprising inner convolutions of 10
a helical wire guard extending through the cap
perforation.
2. A heater plug comprising a block of insu
lating material and spaced contact clips carried
thereby, binding
terminals
and
conducting 15
means carried by'the block and connected to
said contacts, a switch in circuit with said means,
said switch havingan actuator extending out
wardly adjacent an upper corner of said block,
a casing comprising a deep molded shell of insu 20
lating material adapted to receive the block with
the parts carried thereby and having apertures
in its bottom wall spaced to register with said
contacts; said casing having exterior shoulders
formed on opposite sides thereof adjacent its 25
upper open end and having a slot formed in the
wall thereof to accommodate said actuator, said
slot extending downwardly from the top of the
casing; a closure cap for the upper end of the
casing, said cap having an opening therethru
for current supply wires and a helical wire guard
for surrounding said wires, said cap also having
inwardly extending edge portions adapted to en
gage under the exterior casing shoulders, the in
ner convolutions of said wire guard being larger 35
than the opening in the cap and compressed be
tween said block and the under side of the cap
to hold the cap edge portions in engagement with
said shoulders.
-
3. A heater plug comprising a deep molded 40
casing. of insulating material having exterior
shoulders formed on opposite sides thereof adja
cent its top, a perforate closure cap of spring
metal adapted to ?t over the top of the casing
and having inwardly extending edge portions
adapted to engage said shoulders, a resilient heli
cal wire guard extending thru the perforate area
of the cap, the inner convolutions of said guard
being larger than the cap perforation and com
pressed between the cap and the internal parts
of the device to exert an upward pressure on said
50
cap to hold the edge portions thereof in engage
ment with said casing shoulders.
4. A heater plug consisting of a one-piece cas
ing of molded insulated material, a removable 55
closure cap for said casing and a wire guard car
ried thereby, a sub-assembly nested in said
casing in a manner to be freely removable there
from and retained therein by said cap and guard,
said sub-assembly comprising a block of insu 60
lating material and contacts carried thereby in
insulated relation to each other, and conduct
ing means carried by the block and respectively
connected to said contacts, said conducting
means comprising a switch.
5. A heater plug comprising a deep molded
65
casing of insulating material having exterior
shoulders formed on its opposite sides adjacent
its top, a closure cap of resilient metal adapted
to ?t over the top‘ of the casing and having in 70
wardly extending edge portions adapted to en
gage said shoulders, conducting means carried
within the casing, contacts connected with said
conducting means, said cap being perforate to
admit current supp-1y wires for connection to said
3
2,119,809
means, and resilient means exerting an upward
pressure on said cap to hold the edge portions
thereof in engagement with said shoulders, said
resilient means comprising an integral inner por
tion of a guard for said current supply wires ex
tending through the cap perforation.
6. A heater plug comprising a block of insulat
' ing material and spaced contact clips carried
thereby, binding terminals and conducting means
10 carried by the block and connected to said con
tacts, a casing comprising a deep molded shell of
insulating material adapted to receive the block
with the parts carried thereby and having aper
tures in its bottom wall spaced to register with
15 said contacts; said casing having exterior shoul
ders formed on opposite sides thereof adjacent its
upper open end, a closure cap for the upper end of
the casing, said cap having an opening therethru
for current supply wires and a resilient guard for
20 surrounding said wires, said cap also having in
wardly extending edge portions adapted to engage
under the exterior casing shoulders, the inner por
tion of said resilient guard being larger than the
opening in the cap and compressed between said
25 block and the under side of the cap to hold the cap
edge portions in engagement with said shoulders.
'7. A heater plug comprising a deep molded
casing of insulating material having exterior
shoulders formed on opposite sides thereof adja
30 cent its top, a perforate closure cap of spring
metal adapted to ?t over the top of the casing
and having inwardly extending edge portions
adapted to engage said shoulders, a resilient
guard for current supply wires extending through
the perforate area of the cap, the inner portion of
said guard being of greater diameter than the cap
perforation and compressed between the cap and
the internal parts of the device to exert an up
ward pressure on the cap and hold the edge por
tions thereof in engagement with the casing
shoulders.
_
>
_
8. A heater plug comprising a one-piece casing
of insulating material, a sub-assembly nested in
the casing, a removable closure cap for the casing, 10
and resilient means compressed between the sub
assembly and the cap to hold the sub-assembly
?rmly nested in the casing, said means compris
ing inner convolutions of a helical spring extend
ing through the cap and for a considerable dis 15v
tance exteriorly thereof to provide a flexible,
guard for current supply wires.
9. A plug of the character described comprising
a casing of insulating material, a sub~assembly
nested in the casing, said sub-assembly compris 20
ing a block of insulating material and contacts
carried thereby and conducting means carried
by the block and respectively connected to said
contacts, a removable closure cap for the casing,
said cap being‘perforate to admit current supply 25
wires for connection to said means, and resili‘ent
means compressed between the sub-assembly and
the cap to hold the sub-assembly ?rmly nested
in the casing, said resilient means comprising
inner convolutions of a helical spring extending 30
through the cap perforation and serving as a ?ex
ible guard for said wires.
ALBERT E. GRANT.
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