US1380063A - Electric-lamp socket - Google Patents

Description

UNITED STATES PATENT OFFICE.

HARRY F. HITNER, OF WILKINSBURG, PENNSYLVANIA.

v ELECTRIC-LAMP SOCKET.

Specification of Letters Patent.

Patented May 31, 1921.

Application filed December 1, 1919. Serial No. 341,704.

I '0 all whom it may concern:

Be it known that I, HARRY F. HITNER, a

citizen of the United States, and a resident are relieved of all the strain of supporting the socket, and in which the wires can be attached and locked securely in position in a most expeditious manner and without the use of tools. Certain embodiments of the invention are illustrated in the accompanying drawings, wherein: I

. Figure -l is a vertical section through the socket with the parts in the position occupied just before screwing in the cap. Fig. 2 is a plan view of the body portion of the device. Fig. 3 is' a partial vertical section through a 'IHOdlfiQdACOIlStI'IlCtlOIT, and Fig. 4 is a plan view of the construction of- Fig. 3. Referring to the drawings, 1 is the body or socket portion of the device provided with the partition 2, havingthe slots 3 and 1.

This body portion may be made of any desired insulating material, such as glass, por-. celain or vulcanite, glass being preferred because of its cheapness. The front portion of the socket is threaded so as to receive the metal contact sleeve 5, while the rear portion is threaded as indicated at 6' to re-- ceive the cap 7. ,This cap is provided with a flange portion 8 adapted to be threaded into the body portion and is also provided with an opening 9 for the passage of the leading in wires' lOand 11. This cap portion is also preferably made of' the same material as the body or socket portion and is threaded at the opening 9 so as to be adapted to be secured to apipe connection when the socket is desired to be used in this way.

T he: contact sleeve 5. is provided with a terminal 12 in the form of a stri which has a bent over end back of the partition 2, such bent over end belng provided with slots 13, as

indicated in Fig. 2, to provide for the more secure attachment of the leading in wire.

A. second lamp contact member 14 is provided at the center of the partition 2, such member being provided with a terminal 15, having a bent over notched end 16 (Fig. 2-) similar to that of the other terminal. The sleeve 5 may be molded in the material of the socket in case such material is vulcanized, but if .the material of the socket is glass, such sleeve is preferably screwed in after the formation of the socket. ,In so assembling the two parts the terminal strip 12 is bent down inside the shell with its free end directed inwardly. After the shell is screwed to position, the end of the strip 12 is-pressed through the slot 3 and bent over as illustrated.

In order to attach the leading in wires to the binding terminals 12 and 15, loops are formed on the ends of the wire which are hooked around the ends of the terminals and set in the recess 13. This gives a temporary attachment between the wires and terminals and prevents the detachment thereof while the capis being screwed in or in case such .cap should become accidentally loosened after being screwed in. When the cap is screwed in, the end of the flange 8 engages the connections between the leading in wires and the binding terminals and clamps such connections, the cap being screwed down to such an extent that the bent over ends are flattened down, thus clamping the wires between the opposing surfaces of the binding terminals, and also very securely clamping such wires to the socket itself. The bent over ends are-preferably of spring material so that when the cap is screwed firmly into position, the bent over ends apply a continuous yieldi'ng pressure to the cap and tend to prevent the unscrewing of the cathe effect being similar to that of the we l known springwas'her'nut look. In orderto still further guard against the unscrewing of the cap, the low'er edge of the flange 8 may be made slightly corrugated, as indicated at 17 so that when the cap is screwed tightly into position an increased resistance agalnst unscrewingis afforded. These corrugations must be made relatively slight in order not to give too much twisting upon the binding terminals when the cap is screwed into posltion.

22 for connection with the leading in wires.

It will be seer-that when. the cap. is screwed into posii on and the leading in wires, clamped, all strain is removed'from the connection between theleading in wires and the terminals, so that the danger of the leading in wires becoming detached is redu ced The construction also avoids the inconvenience and expense incident to the use of binding screw-s for the terminals. very easy matter to loop the wires over the terminals or to pass them through perforations 'in such terminals, and ;this connectlon 13 then made very secure when. the cap is screwed into position. The making of the terminals of spring material -not only provides the locking feature for the cap,. tending to prevent its unscrewing, but such feature permits the return of the ends, to their original positions when the cap is unscrewed, which would not be the ca'se if non-springmaterial were used, and the ends were flattened down 'i ermanently by the pressure of-the cap,

. -andscrew1ng into the'socket, the front end any variations in the details of the con struction may obviously 'bemade without dei P31115111or from the invention, which COIltGIIi:

plates the leading in wiresand terminal-sand their.

connections and also to clamp s'uchiwiresto the socket. A great variety of connections may be made between the wires and-terminals and the cap may besecured in position in'a variety of ways althoughthe screw con-- nection is preferred. v

of leading inwires "the end of the cap so that when the cap is Itisa terminals extendin 1i1e'mbers to therear o broadly the use ofthe cap to clamp subscribed my name racemes What ll claim is: p 1. In combination in a device of the class described, an insulating lamp socket, a plug or cap of insulating material threaded upon its exterior and screwing into the rear end ofthe socket, andibinding terminals in the socket adapted to be connected with the ends and positioned opposite screwed down into the socket the end thereof engages the connections between the wires and terminals.

2. In combination in a device of the class described, an insulating lamp socket, a onepiece cap in the form of an annular ring of insulatingmaterial screw threaded into the rear end of. the sockets, 'and binding terminals in the socket adapted to be connected with leading-in wires and located opposite. the edge of the cap so that-when such cap is screwed down into the socketthe edge there of engages :andclamps the corinectionsbe tween the wires and terminals.

' 3. In combination in a socket, a body portion of insulating material and comprising a cylindrical member 'with' a transverse parftit ion portion intermediate its ends, lamp of the] partition,

contact members forward from said contact provided with end portions for engaging the ends of leading offsuch plug b'eingjinalinementwith the connectionsbetwee-n the terminalsxand leading in wires, so that whenthe plu-gis.

1 screwed intoposition'it clamps the'said con- H RRY-r. HITNER in wires, and a plug of lhsulating material threaded upon-its exterior l the partition. and

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