US1714610A - Extension plug for electric sockets - Google Patents

Description

May 28, 1929. c. J. MEDER EXTENSION PLUG FOR ELECTRIC SOCKETS Filed June 11, 1926 Patented May 2a, 1929.

was s ns 1 CARL J. Mannie, 0F PHILADELPHIA, PENN YLVANIA Exrnnsron PLUG ron ELECTRIC socxnrs'.

Application filed June 11,.

iThe invention relates to improvements inextensions for electric light sockets as described in the present specification and shown in the accompanying drawings which forma part of the same.

The object of theinvention is to provide a connecting device, more particularly for domestic use, whereby push plugs of cords extending from electrical appliances be. readily attached to an ordinary light socket without having to remove its shade in order to comfortably effect such connection. With this object primarily in view, a further purpose of the invention is to provide a device of this class which will be economical in construction and efficient in its use.

Whereas in the connecting of modern electrical appliances with an ordinary light socket, on account of the small space available within the light shade not conveniently permitting of the insertion of a persons hand for the purpose of screwing the connection in place in the socket, the present invention consists of an elongated insulative member of sufficient length that same may be connected without either removal of the light shade or cramping of the hand of the party effecting such connection. The said insulative member bears a threaded'end for the purpose of screwing into the light socket, its other end being provided with'a rounded, non-detachable portion through which projects the electric conductor of cord so that in attaching or detaching the extension plug the hands of the operator cannot accidently come in contact with live wires or exposed metal parts which mightresult in shocks. Also this structure precludes twisting of the-electric cord. In other words, a relatively large, lower plug portion of insulating material is provided for the extension plug instead of detachable socket orpush plug members as commonly employed.

With these and other objects in view the invention consists of the novel construction hereinafter described and finally claimed.

The nature, characteristic features and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof, and in which:

Fig. l-is a View in side elevation of an extension plug in which twisting of the elec- 1926). Serial No.'1l15,214.

tric cord iseliminated and a relatively large insulated hand portion provided.

Fig. 215 a-view in section thereof. Fig. 3 is a view in elevation ofa slightly different form; and 5 v i Fig. 4 is a view illustrating anelectric light fixture and shade illustrating the manner of attaching an extension plug, the plug in this instance being of still further 'modi For the purpose of illustrating my invention I have shown. in the accompanying drawings several forms thereof which are at present preferred ,by me, since the same have been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumcntalities of which my invention consists can be variously arranged and organized and that my invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

Referring now to the drawings in detail and with especial relation first to Figs; 1 and 2, the reference numeral 1 designates an integral, outer cylindrical and elongated hand gripping portion or casing made of in-' sulating material. The outer end is generally rounded at 2 and has a central. bore 3 entirely therethrough. Extended through this casing is a core 4 of insulating material the outer end of which projects from the casing and the inner end of which carries a porcelain member 8 provided with electrical terminals. A screw-threaded, metallic ring designated 5, which surrounds member 8, and the casing 1 are fixed by means of pins 6. Passing through the core 4 and connect-- ing with the terminals as carried by the core 4 is the electrical cord 7. Thus the core 4, porcelain member and cord may remain fixed or stationary whilethe casing 1 and ring 5 are being secured to an electric socket. Also the casing 1 has no exposed contacts or metal parts at its end 2 and has an elongated insulated hand grip so that no danger of electrical shock may be experienced in lating material and is of sufiicient length to permit a person to grasp the same with out danger of shock as is often experienced in the small, cap-like parts carrying socket engaging contacts. The inner casing part is designated 11 and is provided at its outer end with a part arranged to receive the contacts 10, is elongated and terminates in a" screw-threaded part 12 for engaging a socket. The part 13 of casing 9 is generally rounded and has no exposed metallic parts.

Y screw-threaded with an electrical fixture or.

llke socket 16.

Thus, in this instance, as well as in those previouslydescribed, the operator does not run the risk of electrical shock in attaching or removing said exten sion socket because of the very long casing part 14, Thus, any one of the three deed pin-for securing said sleeve tosaid.

casing, a screw-threaded socket engaging ring interlocked by said sleeve, a threaded hollow metallic thimble to which oneof the wires of an electrical conductor is secured, a core of insulating material within said casing through which passes said electrical conductor, said core having a shoulder, a metal ferrule abutting upon said shoulder, the plug and its ring being capable of being rotated without rotation of said core and its cord, said core abutting against the inner wall of said casing throughout the major portion of its extent.

In. testimony whereof, I have hereunto signed my name. CARL J. MEDER.

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