US288217A - Contact for electric lamps - Google Patents

Description

(No Model.)

H. EDMUNDS, Jr. CONTACT FOR ELEGTRIG LAMPS.

Patented Nov. 13, 1885 Paws MW. Was numm 0.0

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HENRY EDMUNDS, JR, OF NEW YORK, N. Y., ASSIGNOE TO THOMAS J.

MONTGOMERY, OF BOSTON, MASSACHUSETTS.

VCONTACT FoR ELECTRIC LAMPS.

SPECIFICATION formingpart of Letters Patent Nol 288,217, dated November 13, 1883.

. Application filed April 5, 1883. (No model.)

To all whom, it may concern.-

Be it known that I, HENRY EDMUNDS, J r., of the city and State of New York, have invented an Improvement in Contacts for Electric Lamps, of which the following is a specification.

This improvement relates to a peculiar spring-contact thatis employed for incandescent electric lamps to close or break the circuit by a partial rotation ofthe base of the lamp.

In the drawings, Figure 1 is anelevation of the lamp complete. Fig. 2 is a section of the base. Fig. 3 is an inverted plan of the base,

and Fig. "4 is a plan of the cup. a

The electric lamp A is of any desired construction. Ihave shown the same as provided with a coiled filament within a glass globe that is supported by a spring, 0, above the base B, and the spring-hooks (2 form the conductors within the base B.

The metallic cup F, with its inclosed insulat ing block S, is screwed upon the tubular support G, and within the cup and upon the upper surface of the block S are the contactplates 1 1-, having studs 0 0 projecting up from the faces, and these contact blocks are attached by screws 1;, which also serve to clamp the naked ends of the insulated conductors 7r, that pass through the tube G.

Upon the under surface of the base B there are the spring-contact plates at n, and the conductors d are connected with these spring-contacts by being passed around under the screwheads and clamped thereby. The lower end of the base B enters into the cup F, and there is a shoulder at 2 around this base, and a helical spring, p, is introduced between the top by a sliding motion that insures perfect Ineedge of the cup F and this shoulder 2. There is a tubular case, on, around the cup F and 4 base B. At the lower part it is attached to the cup F by screws 3 or by bayonet-lock pins 4, and screws 3, to prevent the parts turning, and to allow for said parts being separated when necessary. Intheupper part of the case '4 m there are slots 5 placed diagonally, and screws 6, passing into the base 13. By this con-- struction I am able to turn on the current by giving the base 13 a partial rotation. In the normal position of the parts, with the screws 6 at the upper ends of the slots5, the electric lamp is raised in the position indicated, by

dotted lines, Fig. 1, and the springs 12 n are out of, contact with the studs 0 0, and hence the circuit is broken. when the base B is par- .tially revolved, so as to bring the parts into the positions shown by full lines, the screws 6, passing down the inclines of the slots, bring the springs n a into contact with the studs 0 o talliecontact, and also keeps the surfaces clean.

I claim as-1nyinvention The combination, with the electric lamp A, and its base B, of the cup F, the spring 19 between the upper end of the cup and the base, the case at, attached to the cup, and having inclined slots, the pins or screws 6, the springcontacts a n, the plates Z l, and studs 0 0, and the electric conductors is, substantially as set forth. 1

Signed by me this 29th day of March A. D. 1883.

HENRY EDMUNDS, JR.

Witnesses:

GEO. T. PINOKNEY, W'ILLIAM G. Mora.

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