US798932A - Electric-lamp socket. - Google Patents

Description

N0. 798,932. l PTBNTED SEPT. 5, `1905. G. B. THOMAS. ELECTRIC LAMP SOCKET.

APPLICATION FILED MAB-6,1905.

Fzgb` v INVENTOR /fama/-f ATTORNEYS WITNESSES r 7%. ci m UNITED STATES PATENT OFFICE.

GEORGE B. TIIOhIAS, OF RIDGEIOR'I, CONNECIICUI, ASSIGNOH TO II-IE BRYANI` ELECTRIC COMPANY, OF .BIIIXEIOR-'Il CONNECTICUT, A COR- PORATION OF CONNECTICUT.

ELECTRIC-LAMP SOCKET.

No. 798,932. Specification of Letters Patent. Patented Sept.5, 1905.

.'iizplieatien filed March G, 1905. Serial No. 248,630.

1b n.7/ uffi/mt it muy conf/'rnc position shown, it makes contact with a ter- Be it known that I,(111onol1 B.'l`ln' .\i.\s,a citiminal plate E to close the circuit through the 55 Zen ot' the United Statesot' America, residing' plate (le, yoke d, and screw e to the plate C in the city ot' Bridgeport, in the county ot' s, and the lamp-lilament.

5 Fairlield, Stateoi' Connecticut, have invented The terminal plate E is of the form best an Improved Electric-Lamp Socket, ot' which shown 1n Figs. 3 and 5 and 1s secured to the the following' is a specification. rear Vtace ot the socket-body A by a screw n, 6C

Ny invention relates more particularly to which is inserted from within the chamber (i thatclass ofelectric-iincandescent-lamp sockets .I before the threaded shell B is put in place and i0 which are known as all-porcelain sockets E soas tobe freeol'contact\\ithsuch shell. The and are without the outer metallic shell and plate E has one arm .f/ projecting'across the rear cap en'iployed in the large majority ot' sockets open chamber I.) Vt'or the action ot' the switch- 65 in commercial use. tumbler, while the other arm e2 carries a bind- The object ot' my invention is to provide a ing-screw c to receive the bared end ot the l5 simple, strong, and el'iicient socket, particuconducting-wire. The other terminal plate F, larly of' the all-porcelain type. which carriesalikebinding-screwj" to receive In the accompanying` (.lrawings, Figure l is the end ot'theothercondnoting-wire, is secured 70 a vertical section through one ot'my improved to the back ot' the body A ot' the socket by a sockets ot the key type on the line I l, Fig'. screwf, passed from the inside 0i' the cham- 20 Fig'. 2 isa similarsection on the line 2 Q, Fig. 3. ber u, but being' in electrical connection with Fig. l) is a plan view ol' the body ot' the socket the threaded lamp-terminal B. This screw]L1 with the cap removed. Fig. i is a view of may, in fact, aid in mechanically holding' the 75 the inner face ol' the cap. Fig'. 5 is a pershell I3 in place by passing' through the inspective view of one ot' the terminal plates. wardly-turned flange at the base of the shell 15 Fig'. 6 is a vertical section through a socket I, as shown in Fig'. l. I prefer, however', to ot' the keyless type. Fig. 7 is an enlarged rely upon screws Cf Gr, Fig'. 2, which are not View of one of the cap-retaining' screws, and in the electrical circuit, to mechanically hold 8O Figs. 8 and 9 are views illustratingadetail in the shell B, these screws passing' vertically l connection with this screw. through the body ot' the insulation and being ;O Referring' to l, Q, and 3, the body A thrcadedinto brackets I'II'Lwhich areplacedin of the socket may be made of porcelain or pockets /M/,formed in theinsnlation, asshown other suitable insulating' material, and at its in Fig'. 2. Into the upper ends of these same 85 inner end it is formed with a cup-shaped brackets are threaded the screws K K, which chamber if to receive the socket-terminals for pass through opening's in the porcelain cap J, the lamp. .In the drawings I have shown and when the parts are put together these these terminals oi' the Edison typehnamely, a screws hold the cap in place. By unscrewing screw-tin'eaded shell B and central terminal C, these screws from the brackets H H the cap this latter being' shown in the present instance can be lit'tcd from the body A or the latter can as a bent spring-plate secured by a central be withdrawn from the cap to get at the con- LO headed screw e. This latter passes through a nection of the wires with the terminal plates central opening' in the bottom of the c-hamber E and F. I prefer to clamp under the plate A and projects into a rear chamber D, open to F a sheet of mica fm, Figs. l and 3, which pro- 95 the rear end of the socket-body A. In the jects over the arm e' ot' the terminal Eto prekey type otl socket this chamber D receives vent short-eircuiting' by the free ends of the L5 the switch S, conductors. This arm e is oi'set, as shown in Any suitable form ot' switch may be em- Fig's. l, 2, and 3, (see also modilication, Fig. ployed; but in the drawings I have shown the 6,) to permit the mica sheet to lie over it. IOO

Perkins form ot' switch (Patent No. 626,927) In Order to prevent the cap-securing' screws with a tumbler having the key-stem Z/ pass- I( Afrom dropping' out of the cap and becom- :O ing` through it with lost motion and acted on ing' lost when the cap is detached from the by a plate di, guided vertically by a yoke Z3 body A, I provide the construction which is and pressed upward by a spring' ([4. illustrated on an enlarged scale in Figs. 7, 8, 105

When the tumbler d is turned to the vertical and 9. Only the outer end of the screw is threaded, as at as shown in Fig. 7, and the neck or stem y back of the thread is made of smaller diameter than the threaded portion, and on this neck or stem I mount a split Washer Z. This is slipped onto the reduced neck or stem y when in the opened or horseshoe form (shown in Fig. 8) and after the screw K has .been put through its opening in the cap. The

Fig. 6, I have also shown how in the keyless form of my socket the switch is replaced by a Xed spacing-bracket M, through which passes an elongated screw c', whose upper end is threaded into a threaded hole in an arm .of the terminal plate E.

I claim as my inventionl. In an incandescent-lamp socket, the combination of an insulating-body having at one end a chamber and terminals therein for the lamp-base, with a central chamber in the other or rear face of the body, terminal plates on said rear face, one of said terminal plates having an oifset arm projecting across said rear chamber, an insulating-sheet clamped under the other plate and lying over said oifset arm, and an inclosing cap for said rear face.

Q. In an incandescent-lamp socket, the combination of aninsulating-body having at one end a chamber and terminals therein for the lamp-base, with terminal plates for the conductorf'wires on the other or rear face of the body, two other chambers also in said rear face and brackets in these latter chambers, in-

closing cap,screws passing through this cap I into the brackets, and screws passing from the lamp-base terminal chamber into the brackets. In testimony whereof I have signed my name to this specification in the presence of two subscrilnin g witnesses.

GEORGE B. THOMAS. Witnesses:

G. W. GooDRIDGE, M. A. BARRY.

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