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Патент USA US2771600

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Nov. 20, 1956
Filed May 15, 1953
nited States atent
‘ 2,771,590
Patented Nov. 20, 1956
The male plug 10 comprises a frame 21 of conventional
construction, but the prongs 12 and 14 are provided at
their free ends with projections or lips 22 and 24 respec
tively, the lip 22 being vertically opposed to the lip ‘24 as
Benjamin F. Nauslar, San Diego, Calif.
Application May 15, 1953, Serial No. 355,299
1 Claim. (Cl. 339--168)
shown in Fig. 5. The prongs 12 and14 are, of course,
electrically connected to a two-wire conductor ‘cable 26..
The female plug 16 comprises a frame 28 of substan
tially conventional construction having a pair of slotted.
openings 3i) through which the prongs of the male‘plug ‘
10 are inserted. Within the frame 28 and formed integrally,‘
therewith are a pair of ledges 32 disposed ‘laterally of.
the slotted openings 30.
pending application Serial No. 85,075, ?led April 2, 1949,
The contacts 18 and 20 are inserted in the arcuate cavi
This application is a continuation-in-part of my co
now Patent No. 2,643,364 and relates particularly to an
ties 34» between the ledges 32 and the inner wall of the
frame 28, being retained therein and substantially sup
ported by means of insulation plates 36 and. 38 respec
interlocking electrical plug assembly.
The primary object of this invention is to provide an
interlocking electrical plug assembly, the male and fe'
male portions of which are interchangeably useable with
conventional plug of the same size.
Another object of this invention is to provide an elec
trical plug assembly in which the electrical contacts are
The contact 18 is positioned toward. one side of the‘
frame 28 and has a returned resilient loop 40 extending
between the wall of said frame and the central‘ pillar 42..
The contact 20 is positioned toward the. other‘side of the
frame 28 and has a returned resilient loop 44 extending
between the wall of ‘said frame and ‘the central‘pillar 42
integral with the plug locking means, thus simplifying
the side remote from the loop 40. The‘ loops 40 and
and decreasing the cost of construction of these ele 25
44 are disposed in opposite directions forreasons which
will later be explained.
. ‘
Another object of this invention is to provide an inter
locking electrical plug assembly, the structure of which
of substantially conventional design,rwlhich enablesvthe
may be applied to conventional plugs with the. minimum
30 plug to be screwed into a standard electrical socket. ' The
of modi?cation.
contact 20 is folded over the end of the insulation plate.
Another object of this invention is to provide an inter
3%, as indicated at 48, and is in electricalcontact with
locking electrical plug assembly which is adapted for
the screwed cap 46 when the female plug ‘is assembled. ‘ r
fabrication from many different materials, so that the
choice of material can be according to the dictates of
The contact 18 is extended outwardly throughthe end‘
the screwed cap 46 and through‘ the insulating disc 50.
availability and price considerations, the exact sizes and 35 of
attached thereto, a suitable aperture being. provided in‘
proportions being matters easily determined to suit par
the screwed cap to prevent an electrical connection ‘with
ticular conditions and needs.
Another object of this invention is to provide an inter
locking electrical plug assembly which is inexpensive and
practicable to manufacture.
Finally, it is an object to provide an interlocking elec
trical plug assembly of the aforementioned character
which is simple, safe and convenient to operate, and
which will give generally ef?cient and durable service.
said contact.
The protruding end of the fcontact18 is‘
bent as indicated at 52 to rest on the insulating disc 50,
40 and is‘fastened by means of a screw 54 which is‘screw‘ed
into the central pillar 42. This screw 54 holds the insu
lating disc 50 and the cap 4-6 to the'framejandy‘conre
pletes the assembly of the female plug.
“ i
It will be seen that when the male plug 10 is inserted
With these and other objects de?nitely in view, this 45 into the female plug 16, the prongs 12 and 14 will strike
the contacts 18 and 20. As the prongs are advanced into
invention consists in the novel construction, combination
the female plug, the lips 22 and 24 on said prongs will
and arrangement of elements and portions, as will be here
pass the ends of the ledges 32. At this point, the op
inafter fully described in the speci?cation, particularly
posed resilient loops 4t) and 44 pressing against the op
pointed out in the claim, and illustrated in the drawing
which forms a material part of this disclosure and wherein 50 posite sides of said prongs will bias the male plug to
similar characters of reference indicate similar or identical
elements and portions throughout the speci?cation and
throughout the views of the drawing, and in which:
Fig. l is a perspective view, partially cut away, of the
interlocked male and female plug portions.
Fig. 2 is a side elevation view of the female plug por
Fig. 3 is a sectional view taken on the line 3——3 of
rotate a few degrees relative to the female plug, about an
axis common to both plugs, so that the lips 22 and 24 will
be forced over the ledges 32. In this position, the male
plug cannot be removed by a direct axial pull, but must
be rotated slightly against the pressure of the resilient
loops 49 and 44, in order to disengage the lips 22 and
24 from the ledges 32.
The loops 4i) and 44 also being the electrical contacts
of the female plug 16, a good electrical connection is
Fig. 2.
Fig. 4 is a sectional view taken on the line 4-4 of 60 made with the male plug 10 while the prongs are locked
Fig. 3.
Fig. 5 is a perspective view of the male plug portion.
Fig. 6 is a fragmentary sectional view of a wall type
electrical outlet showing the female plug portion as adapt
ed for use in a wall type outlet.
in position.
It should be noted that the male plug 10 as shown in
Fig. 1 has the lips 22 and 24 disposed so that the plug
must be rotated in a clockwise direction in order to un
65 lock the prongs. This clockwise rotation ensures that
Fig. 7 is a perspective view of the male plug portion
the female, plug 16 will not be unscrewed from its socket
used with the wall type outlet of Fig. 6.
during removal :of the male plug, most such femal plugs
Referring now to the drawing, the device comprises,
having conventional clockwise threads.
brie?y, a male plug portion 10 having a pair of contact
A slightly modi?ed form of the invention is shown in ‘
prongs 12 and 14, and a female plug portion 16 having 70 Fig. 6 in which the structure is applied to a wall type
therein a pair of resilient contacts 18 and 20.
electrical outlet. These outlets normally comprise a pair
It will be obvious that all said objects are amply achieved
by this invention.
Further description would appear to be unnecessary.
It is understood that minor variation from the form of
the invention disclosed herein may be made without de
parture from the spirit and scope of the invention, and
of female plugs, one of which has been illustrated. The
female plug 56 comprises a frame 58 having a pair of
slotted openings 60 through which the prongs of the
' male plug are inserted.
The frame 58 is fastened to a
mounting plate 62 which is attached to a conventional
outlet box 64.
that the speci?cation and drawing are to be considered as
Within the frame 58 are a pair of ledges 66 similar in
merely illustrative rather than limiting.
character and arrangement to the ledges 32 previously
I claim:
described. The contacts 68 are located behind the ledges
An interlocking electrical plug assembly including a
66 and are provided with terminals 70 protruding through 10
female plug and a male plug having a common axis, said
the frame 58, to enable the electrical connections to be
female plug comprising a frame having a central pillar,
made. The contacts 68 have resilient loops 72 and are
a pair ‘of slotted openings in said frame spaced on op
arranged in opposed positions in alignment with the
posite sides of said pillar, ledges within said frame dis~
slotted openings 60 in a manner similar to that previous
ly described.
15 posed laterally of said openings and de?ning arcuate
The male plug 74 comprises a frame 17 in which are
cavities with the walls of said frame, a pair of looped
?tted a pair of prongs 76 and 78, electrically connected
spring contacts disposed on opposite sides of said pillar
and positioned in said cavities, the loops thereof being
opposed to each other and aligned with said openings, in
sulated plates supporting said spring contacts and hold
to a two~wire conductor cable 26. The prongs 76 and 78
are provided at their free ends with projections or lips
80 and 82 respectively, the lip 80 being opposed to the
lip 82, or extending in the opposite direction, as shown
ing them in said cavities, a screwed electrically con
ductive cap secured to said frame and having a central.
terminal insulated from the cap, one of said spring con
tacts being connected to said cap and the other of said
in Fig. 7. It should be noted that the prongs 76 and 78
are arranged so that counter-clockwise rotation is neces
sary in order to remove the male plug 74 from the female
spring contacts being connected to said terminal, said
male plug comprising a frame having a pair of prongs
spaced to align with said openings, said prongs each hav
rotation is more suited for use with wall type outlets
ing a projecting lip, said lips being ‘on opposite sides of
wherein no provision against unscrewing is required, in
said ‘prongs, said spring contacts engaging said prongs
contradistiction to the case of the screwed type female
plug shown in Figs. 1 to 4. The counter-clockwise rota 30 on opposite sides thereof and urging said prongs together
with said male plug frame to rotate slightly in one direc
tion is consistent with the natural tendency when un
tion about said axis relative to said female plug and said
screwing or removing a plug or similar article and is
lips engaging said ledges when said male plug is rotated
therefore preferable when no provision against loosen
slightly in said direction after insertion into the female
ing is required.
The instant invention offers distinct advantages over 35 plug.
plug 56, this being the opposite to the rotation required
to unlock the female plug 16. This counter-clockwise
conventional plugs by preventing accidental removal of
the male plug due to a pull 1on the conductor 26. As an
example, when. using an electric iron, the electrical cord
is often extended to its full length, with the result that
the male plug may be disconnected. The plug described 40
herein prevents such an occurrence by locking the male
plug ?rmly in place until removed intentionally.
The operation ‘of this invention will be clearly com
prehended from a consideration of the foregoing de
scription of the mechanical details thereof, taken in con 45
nection with the drawing and the above recited objects.
References Cited in the ?le of this patent
Benjamin ____________ __ Apr. 26, 1921
Nonneman _'_ __________ _g Apr. 1,
Stem _________________ __ Jan. 7,
Richards et a1. ________ __ Mar. 7,
Bright _______________ __ Nov. 5,
Nauslar _____________ __ June 23,
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