US748599A - Incandescent-electric-lamp socket - Google Patents

Description

PATBNTBD JAN. 5," 19014.

H. A. FRAMBURG. INGANDBSGENT ELECTRIC LAMP SOCKET. APPLICATION FILED `A IR.. 9. 1903-. NO MDBL.

. f mmmlm l? mgnunnm HW ummm UNITED STATES Patented January 5, 1904. l

l PATENT OFFICE.

HENRY A. FRAMBURG, OF CHICAGO, ILLINOIS.

SPECIFICATION formingpart of Letters Patent No. 748,599,idated January 5, 1904.

Application iiled April 9, 1903. Serial No. 151,714. (No model.)

To all whom it may concern:

Be it known that I, HENRY A. FEAMBUEG, a citizen of the United States, and a resident of the city of Chicago, county of Cook, and State of Illinois,lhave invented certain new and useful Improvements in Incandescent- Electric-Lamp Sockets; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part ot' this specification.

This invention relates to improvements in incandescent-electric-lamp-light sockets, and more particularly toalight-socket adapted for use in conjunction with small lamps, such as are used for ornamental or decorative illuminating purposes.

Light-sockets such as heretofore in use are not readily adaptable for small lamps, owing to the small size and multiplicity of the parts.

The object of this invention is to provide a cheap, simple, and durable construction and one in which there are but few parts and in which the lamp-con tacts are directly supported from the insulator-plug by means of a portion of the contact system, thereby enabling the construction to be simplified.

The invention consists in the matters hereinafter described, and more fully pointed out and defined in the appended claims.

In the drawings, Figure 1 is a side elevation of a device embodying my invention. Fig. 2 is an enlarged longitudinal section of the same. Fig. 3 is a section taken on line 3`3 of Fig. 2, but showing the screws in elevation. Fig. 4 is a side elevation of the outer shell. Fig.4 5 is a side elevation of the cap. Figs. 6, 7, 8, 9, and l0 are views similar to Figs. l, 2, 3, 4, and 5, showing slight modifications of the cap and insulator-sleeve In said drawings, A represents a lamp-bulb of the usual form of construction.

B represents the external shell or casing of the lamp-socket, the front end of which is reduced in diameter, as usual, and which is provided at its rear end with a removable cap B', provided with an outwardly extending screw-threaded sleeve b, adapted to screw directly to a fixture. Said cap is provided with forwardly extending integral armsb b', which as usually constructed are inwardly offset to allow them to pass within the shell B, which is slotted on opposite sides to receive the shoulders formed by the offset. The lower ends of said slots are enlarged to receive the screws b2 b2, which extend therethrough and through threaded apertures in the lower end ofl said arms into engagement with the insulatorplug C and hold the cap and casing firmly in place. If preferred, however, said arms may be constructed without`the oset and the ends thereof bent to form inwardlydirected projections b3 b3, adapted to engage through suitable apertures in the shell B3 of the lamp-socket and in apertures in the plug C, as shown in Figs. 6 to l0, inclusive. Closely fitting within said shell and complemental therewith is the insulator-sleeve D of indurated fiber, rubber, or other suitable material, which together with an insulatingwasher D'in the interior of the cap form a completeinsulating-lining within said capand shell and prevents the possibility of a short circuit should one of the contacts become loose.

A plug C,of rubber, porcelain, or any suitable insulating materiahfits closely within the insulating-sleeve D. Said plug fits closely in the rear end of the shell and is transversely recessed across the rear end for the admission ofthe leads and is cut away centrally on diametrically opposite sides to provide independent chambers to receive the lead-terminals from said recess. One of said chambers is separated from the outer end of the lampsocket by the partition c, integral with said plug, thereby preventing the lead-terminal `therein from short-circniting with the lampcontact. Within said chambers are contactplates E and E', provided, respectively, with binding-screws e and e', which engage therethrough and serveto rigidly bind the lead-terminals into circuit therewith. The plate E extends rearwardly and transversely of the plug vC to a point slightly beyond its center and nis countersunk in the bottom of said recess,

providingapartition c',ofinsulatingmaterial, between it and the opposite lead. The plate E extends forwardly and transversely of the plug, the transverse portion e2 extending through and along the under end of the threaded metallic sleeve F, which forms one of the lamp-contacts.

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A contactscrew F' has threaded engagement with the transverse portion of the contact-plate E and extends axially through said plug from the inner end of the contact-sleeve F into position for the head f of said screw to be engaged by the other lamp-terminal. The transverse portion e2 of the contact plate E and the top of the lamp-contact are cut away centrally sufficiently to let the screw F' pass through and prevent electrical contact therewith, and an insulating-washer f', herein shown as a plurality of layers of mica, through which the screw F passes, rests on said transverse portion e2 of said contact-plate andinsulates the screw therefrom. Said screw F rigidly binds the lamp-contact F to the insulator-plug.

If preferred, the lamp-contact F may have threaded engagement with the outer end portion of the insulating-sleeve D.

The operation is as follows: The upper end of the insulating-plug being recessed provides entrance of the leads to their respective chambers, which are completely separated and insulated from each other except for said recess. The screw F serves both as a means for transmitting the current and for securing the lamp-contact F, the insulatorplug, and the contact-plates in operative relation and also forms the connection for one of the bulbterminals. The current coming in at one lead passes through the plate E, contact-screw F', through the lamp and the contact-plate E', and out at the opposite lead.

Obviously many details of construction may be varied without departing from the principles of this invention.

I claim as my inventionl. In a device of the class described the combination in a lamp-socket, of an insulator- .sleeve therein, an insulator-plug formed to provide terminal chambers on opposite sides thereof intermediate it and the sleeve and having a transverse slot across the top thereof connect-ing said chambers and adapted to admit the terminal leads, a lamp-contact and means rigidly engaging the lamp-contact to said plug adapted to form part of the current source.

2. In a device of the class described the combination with a lamp-socket, of an insulatorsleeve therein,an insulator-plug fitting closely within said sleeve and having a transverse slot across the upper end thereof, oppositelydisposed terminal chambers therein communicating with said slot, a contact-plate in said slot and bent downwardly into one of said chambers, a contact-plate in the opposite chamber and extending laterally beneath said plug, a screw-threaded lam p-contact and a contact-screw insulated therefrom and passing therethrough and through the insulatorplug into engagement Withthe contact-plate in said slot.

3. In a device of the class described the com- `from the lamp-contact sleeve.

4. The combination in a lamp-socket, of a tapered casing having forwardly-extending slots therein, a cap tted over the rear end of said casing, forwardly-directed arms thereon offset to pass within said casing and engage in said slots, an insulating-lining in said casing and cap, an oppositely-chambered insulating-plug therein, a threaded metallic shell forming one lamp-contact, a contactscrew extending longitudinally through the plug and into the lampcontact,a contact-plate extending rearwardly and transversely of the plug into engagement with said screw, a contact-plate extending forwardly and transversely of the plug through and into engagement with the lamp-contact, binding-screws in said contact-plates and a washer insulating the head of the contact-screw from the contact-plate and lamp-contact shell.

5. In au incandescent electric lamp, alampsocket having upwardly-opening slots therein, a sleeved cap, integral arms adapted to secure said cap in position, a threaded insulator-sleeve, an insulating-plug having a transverse groove in the top thereof, a lampcontact threaded to receive the lamp-bulb and insulator-sleeve, an insulator-washer therein, a contact-screw extending longitudinally through said plug, and a plurality of contact-plates adapted to engage the screw and lamp-contact and form the lamp-terminais.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing Witnesses.

HENRY A. FRAMBURG.

Witnesses:

C. W. HILLS, ALFRED C. ODELL.

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