US1206617A - Electric-lamp socket. - Google Patents

Description

G. B. THOMAS.

ELECTRIC LAMP SOCKET.

APPLICATION FIVLED JUNE 27,1914.

1 6 1 7 Patented New... 28, 1916.

I m Fig. .11,

3 1mm M00 inn sans arnnr clerics.

GEORGE 1B. THOMAS, OF BRIDG-EJPORT, CONNECTICUT, ASSIGNOB TO THE BRYANT ELECTRIC COMPANY, OF BRIDGEPORT, CONNECTICUT, A CORPORATION OF CON- NECTICUT.

ELECTRIC -LAMP SOCKET.

modem.

Application filed June 27, 1914. Serial No. 847,700.

To all whom it 112 (13 concern Be it known that I; Gnonon B. Tnonms,

a citizen of the United States of America, and residing at Bridgeport. in thecounty of Fair-field and State of Connecticut, have invented a certain new and useful Improvement in Electric-Lamp Sockets, of which the following is a specification.

My invention relates to electric lamp sockets and particularly to sockets adapted to contain lamps of large candle power, the particular object of my invention being to provide improved means for securing the insulating body of the socket within its casing.

In the accompanying-drawings, Figure 1 is a broken elevation of my socket in which my. invention is embodied in one form: Fig. 2 is a plan of the insulating body of the socket Fig. 3 is a plan of the cap portion of the casing; and Fig. 1 is a side elevation of the cap.

In sockets of the present character, the customary method of installation consists in screwing the nipple oi the cap onto the supporting wire conduit, fastening the wires to the binding screws on the insulating body of the socket, pushing the latter up within the cap in register with short lugs carried by the cap and taking into shallow recesses in the porcelain body whereupon the socket body is fastened in the cap and in engagement with thelugs mentioned by means of a set screw passing through a peripheral flange or skirt at the lower edge of the cap.

The cap and insulating body being thus. secured in position, the lower portion or shell of the casing is then passed up over the body of the socket and screwed into the threaded portion of the cap flange, after which the shell is prevented from backing off by means of a set screw.

It has been found in practice that the use of a set screw to hold the insulating body of the socket up within the cap is unsatisfactory, since the pressure of the screw throws the body out of alinement with the axis of the socket and maintains it in this crooked position even after the shell has been screwed into the cap. Consequently when the lamp is screwed into the socket, it emphasizes this crooked position of the socket body, since the lamp projects at a more or less marked angle to the axis of the casing. The present invention obviates this difficulty. In the form here shown, the socket casing comprises the cap 10 carrying at its upper portion the usual threaded bushing 11, with set screw 12, which bears 7 against the wire conduit and prevents the cap from accidentally becoming loose after it has been screwed into position. A peripheral flange 13 at the lower edge of 'the cap is internally threaded to engage the threaded upper portion of the shell 14; withn which the insulating lining 15 is ad- JIIStQCl asusual. lVithin this casing-is arranged the insulating body 16 of the receptacle carrying the usual lamp terminals, of

which only the screw shell .17 is here shown.'

The current is led to the lamp terminals as usual. from binding screws 18, of which only one is here shown. A. long pin 19 projecting below the lower edge of the cap is rigidly secured thereto at a point within the area of theinsulating socket body '16 and in the adjusted position of the latter enters the recess 20 formed at one edge thereof. The flange 21 at the upper edge of the insulating body'lG overlies the inturned upper edge 22 of the shell and is clamped between the latter and the shoulder 23 of the cap when the shell is screwed up into position. A set screw 24, carried by the peripheral flange 13 of the cap, engages the upper threaded portion of the shell and prevents the latter from backing off after it has been screwed into position.

The manner of assembling the parts is readily understood. The cap is as usual screwed onto the pipe conduit which enters the threaded nipple 11 and the set screw 12 is then tightened. After the wires have been secured to the wire terminals 18 on the body of the socket, the shell 1st is passed up over the body 16 of the socket until the flange 21 on the latter rests upon the inturned upper edge 22 of the shell. Inasmuch as the pin 19 projects below the lower edge of the cap flange 13, it readily positioned in the recess 20 in the socket body and the latter is thus held against swiveling while the shell 14. is screwed home within the cap flange 13. The pin 19 serves the second function of properly locating the body 16 of the socket Within the cap so that the customary wings cut from the cap lining 25 enter the recesses for the binding screws 18 and overlie the latter. When the shell has been turned home and the flange 21 cleinpedbeneeth the shoulder 23 of the cap, the set screw 24 is then tightened to hold the cap and shell in fixed position.

it do not limit my invention to the precise construction shown, but claim as my inven- 1. in an incandescent lamp socket, a casing comprising ev shell and e cap having a screw-threaded sleeving connection, an insulating socket bodv Within said casing and socket body to prevent the latter from turn ing with relation to the cap during the assembly of the shell and cap. v

2. In an incandescent lamp socket, a casing comprising a shell ands cap having a screw-threaded slee'ving connection, an insulating socket body Within said casing adapted to be carried by' the shell during the assembly of the shell and cap, andnieans carried by the cap and engaging the socket body in advance of the sleeving of the shell and cap and serving to prevent the rotation of said socket body with relation to tlllie cap during said assembly of cap and she v 3. An incandescent lamp socket having a casing compiising a shell and cap detachably connected together in sleeved relation denies oi. this patent may be obtained for five iliary recess in advance of the lower edge of said cap' and adapted to enter said recess in the cents each, by addressing the essee? ship, an insulating socket body Within said casing and having lateral recesses for Wire terminals and an auxiliary recess, an insulating lining in the cap having ears extending into said wire terminal recesses in the assembled condition or" the casing, and means carried by the cap andengaging said aux: sleeving of the shell and cap on the assembly of the latter, for the purpose described.

4. An incandescent lamp socket, having a casing comprising a shell and cap detachably connected together, an insulating socket body Within said casing and having lateral recesses for bindlng-screw terminals and an auxiliary recess, an insulating lining in said cap having portions entering the Wire terminal recesses in the assembled position. of the parts together with a pin projecting below the lower edge of said cap andsdapted to enter said auxiliary recess to properly locate the socket body with relation to the cap and: its lining, substantially as described.

- in testimony whereof I have/signed my name to this specificatiomin the presence of two subscribing Witnesses.

GEGRGE B. THOMAS.

Witnesses:

G. V7. Goonnmon,

M. lVICHERT.

"commissioner of Patents Washington, ill. 13.

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