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Патент USA US2042398

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May 26, 1936.
¢_ ,__ HILE
Filed April 19, 1955
I a
Patented May 26, 1936
Charles L. Hile, Louisville, Ky., assignor of one
half to William Ruedeman, Louisville, Ky.
Application April 19, 1935, Serial No. 17,343
2 Claims.
This invention relates to certain new and use
ful improvements in electric contact plugs.
The primary object of the invention is to pro
vide an electric contact plug of the type employed
I5 in connection with electric sad irons, toasters,
heaters and the like for attachment to terminals
for the conduction of electricity.
In attachment plugs of the foregoing char
acter, two contacts are usually employed and are
10 of the spring type for engagement with two ter
minals and the interior of the plug casing be
comes highly heated and hastens disintegration
of the casing body and wear on the contacts. It
is therefore an important object of this invention
15 to provide for a thorough ventilation of the plug
by disposing the conductor wires in spaced rela
tion at their points of entry into the plug casing
and to utilize the usual resilient plug pulling de
vice as an air ventilating passage for the circula
20 tion of air into and through the plug casing, and
for anchoring the conductor wires.
A still further object of the invention is to
provide a contact plug of the foregoing character
wherein the electric wires that are attached to the
25 contacts are spaced from each other within the
plug casing and pass outwardly of the casing at
spaced points respectively opposite the longitudi
nal axis of the‘casing so that liability of the
wires touching each other within the casing is
30 eliminated.
With the above and other objects in View that
will become apparent as the nature of the inven
tion is better understood, the same consists in the
novel form, combination and arrangement of
35 parts hereinafter more fully described, and then
In the drawing:
Figure 1 is a side elevational view of an elec
tric contact plug constructed in accordance with
40 the present invention, showing the conductor
wires separated at their points of passage from
the plug casing;
Figure 2 is a plan view of the plug with one
casing section removed and showing the spaced
relation of the spaced conductor wires within the
casing and the unobstructed air passage from the
casing through the resilient plug pulling de
Figure 3 is a side edge elevational view of the
Figure 4 is an outer end elevational view of the
resilient plug pulling device;
Figure 5 is a detail sectional view taken on line
55 5_5 of Figure 3;
(Cl. 1'73—332)
Figure 6 is a detail sectional view taken on line
5-6 of Figure 3; and
Figure 7 is a plan View of one of the casing
sections with the contacts removed and showing
the lateral passages for the conductor wires.
Referring more in detail to the accompanying
drawing, there is illustrated an electric contact
plug of the conventional exterior con?guration
and comprising sections lb of identical construc
tion mating to form the casing and secured to- 10
gether by the usual
transversely extending
counter-sunk nut and bolt combinations ll.
Each casing section I0 as shown in Figure 7
has a raised central longitudinally extending rib
l2 providing lateral grooves l3 for the reception
of the usual contacts I4 and each groove l3 has
cross ribs l5 rising from the bottom walls there-v
of to space the contacts I4 from the walls of the
casing ID. The ribs l2 have openings I6 therein
through which the bolts l I pass.
The inner end of each casing section I0 is
provided with a semi-circular channel I‘! with
the two channel sections- mating to form a cir
cular channel for the reception of one end of the
resilient plug puller. The semi-circular channels 11 are spaced from opposite side edges of
the casing section II] and the inner end wall of
the casing section between each end of the semi
circular channel IT and the side edge of the cas
ing section is cut away as at Hi to provide a
passage for the conductor cord. A diagonally
extending rib [2a is disposed adjacent each cut
away portion “! and the inner end of the rib
terminates in spaced relation to the longitudi
nal rib l2 to provide an air passage or vent I2b.
As shown in Figure 2, the contacts M are seated
in the. respective grooves I 3 and the conductor
cords l9 are anchored as at 20 to the respective
contacts I 4, the conductors respectively passing
through the cut away portions l8 and being en- 40
tirely separated from each other within the plug
casing and at their points of passage from the
casing and exteriorly thereof.
The resilient plug pulling device comprises a
tubular coil spring 21 having a ring 22 at one 45
end thereof removably received in the channel
sections I‘! to be locked in said sections when the
casing sections are secured together. The other
end of the tubular spring 2! is anchored in the
pull handle 23 as shown in Figure 6 and said pull 50
handle is provided with a cross head 24 out
wardly of the tubular portion 25 to which the
spring is anchored. The cross head 24 of the
pull handle is of channel formation as shown in
Figures 4 and 6 and the tubular portion 25 there- 55
V 725,‘,
of’ opens into the cross head to’ provide an unob
structedair passage from the interior of the plug
> > casing to the tubular coilspring'2l and pull han
. 1. In'an electric contact plug of the character’ 7
described, a plug body formed of sections having
spacer ribs and ventilator openings therein, a a
1 dle.» A transverse opening 26 is formedin'the pair of contacts therein, a tubular plug pullerlate '
channel shaped cross head 24 and the two con ,tached toone end thereof and including a’ coil’
ductor wires 29' may be brought together, passed
through and anchored in the opening'26 and at
a convenient point attached to a: plug or other
_ source of electrical energy.
spring having one end anchored to the body and,
a transversely extending puller head at itsxouterir
end, the puller head having an opening extendé
ing transversely thereof, said plug puller being ‘in
. From the above detailed description of the in; open communication with the plug body to' ef-n 10w
ventioni it is believed that the construction and frect ventilation of the latter and'conductor wires P
use thereof will at oncebe apparent, it being attached to the contacts and passing from the
noted" thatrthe' conductor wires are completely plug body in spaced relation to each other and at
opposite sides of the plug puller and ,freely pass
7 separated from each other within the plug cas
15 ing, thereby eliminating the blowing of fuses and ing in juxta-posed relation through the trans 15;
the burning of wires while a thorough ventilation
of the plug is possible by directing the conductor
wires from the plug casing exteriorly of the tubu
,lar' resilient plug puller so that air may freely
20 circulate through the plug puller into the plug
casing. It is also to ‘be understood that the re
silient plug puller that is directlyattached to the
plug body relieves’ all strain on the conductor
wires and liability of the wires being pulled loose
from the contacts is eliminated.’
'While there is herein shown and described the
preferred embodiment of the invention, it is nev
ertheless to be understood that minor changes
may be made therein without departing from the
30 spirit and scope of the invention as claimed.
I claim :—
verse opening in the outer end of the puller head.
2. In an electric contact plug of the character
described, a plug body, a pair of contacts there
in, a tubular resilient plug puller attached to'the
plug body, conductor wires attached to the con 20
tacts, spaced from each other within the plug
body and passing from the plug body respectively
at opposite sides of the plug puller and the outer
end of the plug puller having an opening there- '25
in through which the conductor wires are passed
with su?icient slack present in the conductor
wires at opposite sides and exteriorly of the plug
puller whereby strain on the wires is relieved 7
during the pulling of the plug.
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