US1775564A - Electric plug - Google Patents

Description

SePt- 9, 1930. c. L. GooDsPEr-:D 1,775,564

ELECTRIC PLUG Filed Feb. 24, 192e Fi 1 Y I d HIlllllllllllllllllllllllIHIII INVENTOR wlTNEssEs Chaz-ZesL. Gau/weed l i MM V BY M i A ATTORNEY Patented Sept. 9, 1930 maar oai-ICE cursa sierra cas L.- eoonsaan, oir @am nro-oir, naw masas', assrsnoa ro Avis I.. GoonsrEEn, or oon, maw

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This inventionirelates to electrical exten sion cord push plugs, and comprehends means constituting a part of the plug for facilitat` ing its disconnection from an outlet socket.-

It is a well-known fact that push p lu s tend to stickin the sockets, and due to t e fact that said plugs are constructed in such a manner as `to .aiord no means for facilitating their withdrawal or disconnection from the sockets with which'they are associated,

:it-isl a common practice to employ the extension cord as a means for witldrawingst'he plug from the socket. This results in breaka e of the cord, causing short circuits in adw'dition to subjecting the terminal posts to strain which eventually renders the plug unfit for use.

The present invention comprehends a simple, convenient, inexpensive and eicient means for facilitating the withdrawal and `disconnection of the plug from its ysocket without injury thereto or 'to the extension cord which is carried thereby.` l Furthermore, the invention comprehends a means for facilitating the disconnection of an extension cord vpush plug from "a socket which elects a direct outward move ent of the plug from the socket so asto relieve the connectmg elements of lateral thrusts which tend to injure the structure.

With the above recitedand other objects in view, reference is hada to the following description and accompanying drawings in \which there is exhibited one example or embodiment ofthe invention while the appended claims define the actual scope of the invention. l n

In the drawingstion, illustrating the plug in ful and dotted lines, resdpectively, in the disconnected and connecte positions;

. e Fig. 2 is a sectional view through the plug and socket illustrating the'plug in its conv connected.

\ Figure 1 is a side view with arts in sec-jV removed from the plug.

bearing and pull element attaching member Reerrin tothe drawings by characters of reference designates an outlet socket of any approved type, which is provided with female contact elements B disposed in alinement with apertures C in the wall orcasing .of the socket, through which the contact legs D of the' plug E are ada ted to belinserted and eng ged with the emale contact elements .The plug E is provided with a threaded axial bore 10, which communicates with the recess 11 in the inner .face of the plug within which the contact legs D are attached in the usual lmanner andwith which the terminals of the extension cord 12 are The invention includes an exteriorly threaded thimble 13 which is threaded into the bore 10 and which is provided at its outer end with an annular outwardly projecting flange. 14. A ring or annulus 15 having diametrically disposed finger-en aging hooks 16 is attached to the plug bodyy clamping of the ring or annulus 15 between the flange .14 and the outer end of the plug. A plunger or stem 17 extends through the thimble 13, which acts as a bearing therefor, thereby mounting the plunger or stem inthe plug for axial movement with respect thereto.

end by a solid extremity 19. The plunger or v stem is preferably formed with a slot 20 lin its wall, through which the extensioncord 12 extends.

In practice, with the stem or plunger 17 in the position illustrated in Fig. 1, the plug -is pushed into the socket so that the contact legs D are rictionally engaged with the female contact elements B. During this operation, the inner slot terminal 19 of the stem or plunger bears against the central portion of the outer wall o'f the socket so that the plug E moves axiallyvthereof and relatively thereto to the position illustrated indotted lines in Fig. 1 or the position illustrated in Fig. 2. This causes the plunger or stem to roject outwardly an appreciable distance om the outer end of the socket so that when it is desired to disconnect the plug from the socket, the index and middle lingers are engaged around the hooks or clips 16 and the thimble bears upon the u'lanipulating head 18 of the stem. By moving the plug outwardly on the stem or plunger by pulling the fingers toward the tlnunb, it is obvious that the plunger acts as a guide -for causing the plug to move directly outwardly to prevent lateral movement which tends to injure the structure 'of both the plug and socket. In order to limit the relative movement of the plug With respect to the stem or plunger, the plunger 17 is formed With peripheral beads 21 and 22 which coact with the thimble 13.

I claim:

1. Au electrical extension cord push plug, including means carried thereby for facilitating the disconnection of the plug from its socket, said means consisting of a stem extending axially through the plug and adapted to bear at its inner end upon the socket and finger engaging elements carried by the plug, a bushing through which the stem extends having threaded connection with the plug body and a head at one end of said bushing for clamping the finger engaging elements to the plug body.

2. The combination, with an electrical extension cord push plug, of means carried by the plug body for facilitating the disconnection of the plug from a socket, said means comprising a ring having diametrically disposed linger engaging pull clips, a bushing threaded into the plug body and extending through the ring for attaching the same thereto, and a thumb engaging plunger mounted for axial movement throughl the bushing and plug body and designed to bear at its inner end upon the central portion of the socket to serve as a guide for causing a direct outward movement of the plug body from the socket.

Signed at New York, in the county of New York and State of New York this 17th day of' February. A. l). '1928.

CHARLES L. GOODSPEED.

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