US1505821A - Lamp holder - Google Patents

Description

G. B. THOMAS LAMP HOLDER Aug. 119, 192% Filed April 27, 1918 Patented Aug. 19, 1924.

UNITED STATES 1,505,821 PATENT OFFICE- GEORGE B. THOMAS, OE BRIDGEPO'RT, CONNECTICUT, ASSI GNO-R TO BRYANT ELECTRIC COMPANY, A CORPORATION OF CONNECTICUT.

LAMP HOLDER.

Application filed April 27, 1918. Serial No. 231,113.

To all whom it may concern:

Be it known that I, GEORGE B. THOMAS, a citizen of the United States of America, residing at Bridgeport, in the county of Fair-' field and State of Connecticut, have invented a certain new. and useful Improvement in a Lamp Holder, of which the followin is a specification.

y invention relates to a lamp holder for sockets of the Edi-Swan type, and particularly to a device for steadying the lamp in its socket, the object of my invention being to provide a simple and readily operated device y which the lamp may be prevented from 1 rocking on the arms of its customary holding pins.

In the accompanying drawing, Fig. 1 is a broken side elevation of a lamp socket of the Edi-Swan type, showing a 2 lamp in position therein and engaged by the holding device to which the invention relates;

Fig. 2 is a partial side elevation thereof;

Fig. 3 is a broken side elevation showing the holding ring in the position which it assumes on the insertion of a lamp into the socket;

Fig. 4 is a section on the line 4-4, Fig. 2;

Fig. 5 is a drop perspective of the shade holiding ring and the lamp-holding ring;

Fig. 6 is a plan of the lamp base.

Lamps of the Edi-Swan type comprise a base having a metal shell 10, to which the the studs 12, by means of which the lamp is held in a socket. At theentering end of the shell 10 is secured an insulating button 13, carrying the lamp- terminals 14 and 15, with which cooperate the corresponding terminals of the socket. The socket here shown for cooperating with a lamp of this type, has a casing of the same general construction as that shown in my prior Patent 1,239,317 and comprises a cap 16 latched to the shell 17 the other end of which is extended by a sleeve 18 having a flange 19 which overlies the inturned lower edge 20 of the shell 17 and rigidly secured in position by the lock nut 21, which screws upon the threaded area 22 of the sleeve and *may be utilized to hold lamp shade, as indicated in my prior patent above referred to. At its outer end, the

sleeve 18 is of slightly reduced diameter to 55 more closely fit telescopically over the enterglobe 11 is sealed and from which project ing end of the shell 10 of the lamp base, and is provided on opposite sides with bayonet slots, 23, with which the studs 12 of the lamp base engage. The spring stud terminals 24 and 2 5. (Fig. 4) of the socket, which cooperate with the terminals 14 and 15 of the lamp base, are carried by the insulating body 26 of the socket and project into the chamber formed by the sleeve 18. While there is a general correspondence between the diameter of the entering end of the lamp base 10 and the internal diameter of the sleeve 18 at its outer end, there is nevertheless considerable play between these parts, with the result that the lamp rocks on the studs 12 after the lamp is in position. This not only augments the flicker of the light emitted by the lamp when. the latter is subject to vibration, but is apt to cause injury to the lamp filament and thus shorten the life of the lamp, and, furthermore, adds to the insecurity of the bayonet slot fastening. To avoid this detect, 1 have now provided means carried by the lamp socket and engaging the lamp in its inserted position to hold the latter rigid and prevent its rocking on the axis of its studs 12.

This lamp-holding device in the form here shown comprises a ring 27, internally threaded at'28 to screw upon the threaded area 22 of the socket'sleeve 18. At the opposite end of the ring a neck 29 is formed by inwardly offsetting the wall of the ring a suflicient distance to conform the internal diameter of the neck 29 substantially to that of the entering end of the shell 10, so that when the ring is screwed outward on the sleeve 18, the neck 29 of the sleeve engages the shoulder 30 of the lamp base. At opposite points, slots 31 are cut in the neck end of the holding ring 27 to permit the passage of the studs 12 on the lamp base into the bayonet slots 23 in .the sleeve 18,

studs 12, which, in inserted position, project through the bayonet slots 23 beyond the outer face of the sleeve. This clearance between the holding ring 27 and the sleeve 18 permits the ring to be rotated after the lamp has been inserted in the socket. A knurled area 33 may be formed on the ring to facilitate its rotation.

The operation of this device is readily understood. In order to permit the insertion of the lamp in the socket, the holding ring 27 is screwed down toward the socket shell 17 to get it out of obstructing position.

When turned sufficiently far down, it is neck 29 bears firmly against the shoulder 30 of the lamp base 10. In this position it not only holds the lamp against oscillation on the studs 12, but also locks the studs in engagement with the oiiset branch of the bayonet slot 23 and prevents any possibility of the lamps accidental escape from the socket.

Various modifications in detail of construction and arrangement will readily occur to those skilled in the art which do not depart from what I claim as my invention. I do not limit the application of this locking device to sockets of-the particular construction shown, since .it may obviously be used with any type of socket having the necessary threaded area or equivalent means for engagement with the locking ring.

I claim 1. A lamp socket having a casing element slotted to afford a bayonet joint connection with a cooperating lamp and having a threaded area, in combination with a screw ring threaded on said area and movable into engagement with a shouldered lamp base after the establishment of said bayonet joint connection to hold the lamp against vibration with relation to the socket, said ring surrounding the bayonet joint but being spaced from said casing element at the bayonet joint to clear one of the bayonet oint members and permit the rotation of ,the ring around said joint, but constricted at its outer end to afford an end engagement with the lamp base.

2. A lamp socket having a casing element slotted to afford a bayonet. joint connection with a cooperating lamp and having a threaded area, in combination with a screw ring threaded on said area and movable into end engagement with a shouldered lamp base after the establishment of said bayonet joint connection to hold the lamp against vibration with relation to the socket, said ring surrounding the bayonet joint, and being inwardly offset and slotted at its lamp engaging end to permit the passage therethrough of the bayonet joint member on the lamp end.

3. The combination with an electric lamp having a shouldered base'with lateral securing studs, of an electric lamp socket having a lamp-supporting casing element comprising a threaded sleeve bayonet-slotted at its lamp-receiving end to accommodate said studs, and within which the end of the lam is socketed in inserted position, together with a shouldered ring screwed on said sleeve .and radiallyslotted to accommodate the studs on the lam base, but free to rotate on 'said casing e ement when the lamp is in inserted position, the outer end of said sleeve being of reduced diameter and havin an end engagement with the shoulder oi thelamp base when said ring is moved into lamp-engaging position.

4. In a construction as specified in claim 3, radial slots in the lamp-engaging ring extending into the shouldered area of said 1% testimony whereof I have signed my name to this s ecification.

EORGE B. THOMAS.

Images