Патент USA US2406030код для вставки
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.