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Патент USA US2406030

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A. 26,1946.
' J.’ F. O’BRIEN '
LOCKING DEVICE FOR ELECTRICAL CONNECTORS
Filed on.‘ 14, 1942
Patented Aug. 20, 1946
2,405,030
UNITED STATES PATENT OFFICE
2,406,030
LOCKING DEVICE FOR. ELECTRICAL
CONNECTORS
Joseph F. O’Brien, Jersey City, N. 3., assignor to
I John B. Pierce Foundation, New York, N. Y.,
a corporation of New York
Application October 14, 1942, Serial No. 461,948
10 Claims. (Cl. 173-—330)
1
2
.
This invention relates to locking devices for
electrical connectors.
In particular, the invention relates to improved
1, of the cooperating looking or anchor plate of
the outlet receptacle;
means for securement of an electrical outlet plug
?tted with my improved locking means;
to an outlet receptacle to prevent the accidental
separation thereof, and to provide strain relief
Fig. 3 is a bottom plan view of an outlet plug
1
a
Fig. 4 is a plan view of a section of electrica
conduit at the outlet receptacle portion thereof,
and having mounted thereon one form of looking
the electric wire at the outlet plug.
or anchor plate;
'
It is an object of the invention to provide im
Fig. 5 is a vertical elevation of an outlet plug
proved means for releasably securing an electric 10 equipped with a preferred embodiment of‘ the in
vention;
'
outlet plug to an outlet ?xture.
means to eliminate strain on the connections of
Fig. 6 is similar to Fig. 4, illustrating a second It is an object of the invention to provide means
form of plug looking or anchor plate; and
whereby an outlet plug may be attached to an
Fig. 7 is a bottom view of the locking or ancho
outlet receptacle in such manner that the plug
cannot be pulled out of contact with the recep 15 plate of Fig. 4.
tacle in normal usage, but will be released in the
Referring to the drawing, an attachment plug
event of an abnormal pull on the wire or cable
‘ I!) having a conventional electric cord connection
or wire cable II is shown in operative position
with respect to an outlet-provided conduit I2, and
It is an object of the invention to provide an 20 removably secured in such position by the plug
lock I4 and anchor or locking plate I5.
outlet plug securement means which will not in
The conduit I2 may be of any conventional
terfere with the use of the plug with standard or
cross-section, having outlet provisions including a
conventional receptacles.
?at upper surface against which the face of the
It is an object of the invention to provide an
outlet plug securement means which can be used 25 attachment plug I0 may abut ?rmly. In the form
illustrated in the drawing, the conduit I2 is rec
with a standard plug and which will permit the
tangular in shape, as disclosed and claimed in
securement of said plug without the necessity of
U. S. Patent No. 2,239,652, entitled Electrical unit,
twisting the plug or any complementary locking
of which I am a joint patentee.
.
device on the plug or the receptacle.
30
The anchor or looking plate I5 is conveniently
According to a preferred form of the invention,
formed from stamped metal. For a rectangular
I provide collar means adapted for securement
conduit, the anchor I5 includes side walls I6 of
about the body of an electric attachment plug,
triangular contour as shown in Fig. 1, which ter
said collar means having spring members having
minate in inwardly turned ?anges I‘I overlying
outwardly extending terminals for engagement ‘ the rear wall of the conduit. I2, see Fig. -7. Said
with a looking or anchor plate secured to the out
?anges I‘! may include members I‘Ia which over
let receptacle.
lie the outer rear wall of the conduit I2 and ,a
, Preferably, the looking or anchor plate has
countersunk portion I'Ib adapted to ?t within a
pockets or equivalent formed therein, into which
groove in the rear wall of said conduit I2 to se- I
the terminals of the spring members ?t, thereby
cure the anchor or locking plate I5 against lateral
to hold the outlet plug in operative association
movement along the conduit.
.
with the outlet receptacle under all normal con
Preferably, the side walls I6 of said anchor or
ditions of use.
locking plate I5 are springable, to engage the
It is a feature of the invention that the spring
sides of the conduit I2 snugly. '
_
members which are carried by the plug-provided
The respective side walls I6 of anchor I5 are
member do not extend beyond the face of the out
interconnected by transverse end elements I8, see
let plug, i. e., the blade-provided plug member
Fig. 4, suitably spaced to provide an opening of
from which its blades project, thereby permitting
ample area to expose the plug openings and to ac
which might otherwise damage the cable or break
its connection with the outlet plug.
the use of an outlet plug equipped with my inven
commodate an attachment plug of maximum con
tion with conventional electric outlet receptacles.
In the accompanying drawing:
Fig. 1 is an elevation, partly in section, showing
an outlet plug secured to an electric receptacle
pursuant to a preferred form of the invention;
Fig. 2 is a section, taken on lines Z_~—-2;of Fig. 55
ventional size. The center portions of the end
elements I8 are struck upwardly to provide pock
ets 20, in mutual alignment.
:
In the embodiment of Figs. 1, 2, 4 and 7, the an
chor or locking plate I5 is held in position by the
snug embrace of side members I6 with the con
2,406,030
3
4
duit walls l2 and the engagement of the depressed
stood that many changes and modi?cations may
be made provided they do not depart from the
scope of the claims.
I claim:
1. Means for releasably securing an attach
ment plug to an outlet receptacle, comprising the
combination with an anchor plate having side
portion l'lb with a groove or the like in said con
duit.
.
According to the embodiment of Fig. 6, end
elements l8 are provided with ears 2| through
which screws may pass into suitable tapped open
ings in the conduit l2, thereby permanently se
curing the anchor member (5 against the possi
walls resiliently embracing the side walls of the
bility of accidental removal or displacement,
outlet receptacle, ?ange means engaging with the
Referring to Figs. 3 and 5, the plug lock M in 10 rear walls thereof, and spaced pocket means dis
cludes members of similar shape but opposite
posed above the face of the receptacle, of a strap
hand, each member having a relatively large, sub
for securement about the body of the attachment
stantially semi-circular strap 24 for securement
plug and spring means operatively associated with
about the body of the plug l0, and a semi-cir
said strap and having free, springable ends ter
cular collar 25, said strap and collar being con 15 minating in outwardly directed hook members for
nected by the bridge 26.
engagement beneath the pockets of said anchor
Secured to each of said bridges 26, desirably
plate.
to the under side thereof, are spring members
2. Means for removably securing an attach
21, the free ends of which extend through a slot
ment plug to an outlet receptacle, comprising the
28 in each of the respective bridges to present an 20 combination with an anchor plate having side
external springable portion which may be
walls resiliently embracing the side walls of the
grasped and squeezed inwardly to an extent per
outlet receptacle, flange means engaging with
mitting the hooked ends 3%! thereof to clear the
the rear walls thereof, and spaced pocket means
end walls of the pockets 29.
disposed above the face of the receptacle, of a
The respective straps 24 of the plug look It 25 strap for securement about the body of the at
may be clamped about the plug [0 as by the il
tachment plug, member's extending upwardly
lustrated screws, and the collar portion 25
therefrom, and spring means fastened at one end
clamped tightly about the conductor wire H to
to the underside of said members and having
serve as a strain relief and prevent a disconnec
free, springable ends terminating in outwardly
tion of the Wire cable I I with the terminals of the 30 directed hook members for engagement beneath
outlet plug I0 in the event that a strong pull is
the pockets of said anchor plate.
exerted on the wire.
>
y
In employing the invention, the ‘spring mem
bers 21 carried by the blade-provided plug mem
ber are squeezed together as aforesaid, where- ;
upon such blade-provided plug member may be
inserted directly into the indicated apertures cf
the outlet, following which upon manual release
of the spring members 21 their outwardly di
rected hook free ends 30 are caused to engage 40
beneath the top walls of the pockets 20.
Desirably, in the circumstance of an abnormal
pull exerted upon the wire cable either the upper
wall surface of the pockets 2B, or the outwardly
extending ends 30 of springs 21, or both, should
be so sloped that a strong outward pull applied
to the cable H will initiate a camming action
of the ends of spring members 21 against the
pockets 20 and urge the said spring members in
wardly to release from pockets 20, whereupon the
plug 10 will be released from the receptacle be
fore damage can be done to the cord II or the
3. Means for removably securing an attach
ment plug to an outlet receptacle, comprising:
an anchor plate having side Walls for tightly
embracing the side walls of said outlet receptacle,
said side walls terminating in inwardly directed
?anges for gripping the rear wall of said outlet
receptacle, said side walls being connected by
spaced transverse members extending across the
face of said outlet receptacle, each transverse
member having a pocket formed therein; and
attachment plug means including opposed sub~
stantially semi-circular strap portions adapted
collectively to encircle the body of said plug for
securement thereto, opposed, substantially semi
circular collar portions adapted collectively to
‘securely embrace a wiring serving said attach
ment plug, bridge means connecting the respec
tive strap and collar portions, each said bridge
means having a slot intermediate the ends
thereof, and spring means secured to each said
bridge means on the underside thereof and hav
ing free, springable ends extending through said
connection of the conductors of said cord with
slot thereof, said springable ends terminating in
the outlet plug 10.
It will be observed that embodiments of the 55 outwardly extending hook portions disposed sub
invention are particularly applicable to blade~
stantially in the plane of the face of the attach~
ment plug for engagement with the pockets of the
provided electrical plugs in association with elec
trical outlets or receptacles having a substan
respective transverse end members of the ancho
plate.
'
tially flat face, in which their blade-receiving
4. Means for removably securing an attach
apertures are located, thus affording the a?ixing 60
ment plug to an outlet receptacle, comprising the
to such substantially flat facea substantially ?at
combination with an anchor plate having side
anchor or looking plate, the pockets of which are
walls resiliently embracing the side walls of the
arranged in close contiguity with such ?at face
outlet receptacle, flange means engaging with
of the outlet whereby the spring members hav
the rear walls thereof, and spaced pocket means
ing springable hook free ends are disposed within
disposed above the face of the receptacle, of a
the zone of the bodyof the blade-provided plug,
strap for securement about the body of the at
thereby facilitating the manual release of such
tachment plug, members extending upwardly
springable members from such pockets of the
therefrom, and spring means fastened at one end
locking plate concomitant with the act of grasp
to the underside of said members and projecting
ing theplug in the normal manner of withdraw
through said members to the outside thereof,
ing its blades from the apertures of the outlet
said spring means having springable ends ter
or receptacle when it is desirable to disconnect
minating in outwardly directed hook members
the plug with respect to the outlet or receptacle.
for engagement beneath the pockets of said an
Whereas I have described my invention by ref
'
r'
>
erence to speci?c forms thereof, it will be under 75 chor plate.
5
2,406,030
5. Means for releasably securing a blade-pro
vided electrical plug to an aperture-provided elec~
trical receptacle or other outlet, comprising: a
locking plate arranged to be a?‘ixed to the aper
ture-provided face of such outlet, said locking
plate having mutually spaced pockets; a strap
arranged to be ?xedly secured to such blade
provided plug about the body thereof; members
extending from said strap; spring members se
cured to said members and having free spring
able hook end portions arranged for resilient in
6
8. Means for releasably securing a blade-pro
vided electrical plug to an electrical receptacle
or other outlet having a ?at face provided with
blade-receiving apertures, comprising: a sub
stantially ?at lockingplate arranged to be af
?xed to the substantially ?at face of such elec
trical outlet, said locking plate having mutually
spaced pockets; a strap arranged to be ?xedly
secured to such blade-provided plug about the
body thereof; members supported by said strap;
spring members secured to Said members and
sertion into said pockets.
having free springable hook end portions ar
6. Means for releasably securing a blade-pro
ranged for resilient insertion into said pockets,
vided electrical plug to an aperture-provided elec
trical receptacle or other outlet, comprising: a 15 said spring members being disposed within the
zone of the body of such blade-provided plug.
locking plate arranged to be a?ixed to the aper
9. A blade-provided electrical plug having a
ture-provided face of such outlet, said locking
body provided with a substantially ?at face;
plate having mutually spaced pockets; a strap
electrical blades projecting from said body at
arranged to be ?xedly secured to such blade
provided plug about the body thereof; members 20 said ?at face; strap means secured in substan
tially ?xed relation with said body; members
extending from said strap; spring members ?x
?xedly supported by said strap means, spring
edly secured at their one ends to said members
members secured to said members and having
and having free springable hook end portions
free springable hook end portions, said spring
arranged for resilient insertion into said pockets,
members extending within the zone of said body.
said spring members being disposed within the
10. Means for releasably securing a blade
zone of the body of such blade-provided plug. 25
provided electrical plug to an electrical recep
7. Means for releasably securing a blade-pro
tacle or other outlet having a substantially ?at
vided electrical plug to an electrical receptacle or
other outlet having a ?at face provided with
face and blade-receiving apertures in such face,
trical outlet, said locking plate having mutually
means secured at one end thereof in ?xed rela
tion with and within the zone of the body of such
comprising: a locking plate arranged to be af
blade-receiving apertures, comprising: a sub—
stantially ?at locking plate arranged to be af 30 ?xed to such receptacle adjacent such substan
tially ?at face and having locking means; spring
?xed to the substantially ?at face of such elec
spaced pockets; a strap arranged to be secured
to such blade-provided plug about the body
thereof; members supported by said strap in
?xed relation with said blade-provided plug;
spring members secured to said members and
35
having free springable hook end portions ar
ranged for resilient insertion into said pockets. 40
blade-provided electrical plug, said spring means
having springable free end means arranged to
cooperate with said locking means of said lock
ing plate for releasable connection therewith.
JOSEPH F. O’BRIEN.
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