US235258A - Electric lamp - Google Patents

Description

2 Sheets-Sheet 1..

(No Mod al.)

J. W. LANGLEY. Electric Lamp.

Patented Dec. 7,1880.

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(No Model.) '2 Sheet s8heet 2.. J. W. LANGLEY. .Electric Lamp.

No. 235,258. Patented'Dec. 7,1880.

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UNITED STATES PATENT @rrrcn.

JOHN IV. LANGLEY, OF ANN ARBOR, MICHIGAN.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 235,258, dated December '7, 1880.

Application filed July 16, 1880.

To all whom at may concern:

Be it known that 1, J OHN W. LANGLEY, of Ann Arbor, in the county of Washtenaw and State of Michigan, have invented a new and useful Improvement in Electric Lamps, of which the following is a specification.

In the drawings, Figure 1 is a vertical section through the lamp. Fig. 2 is an end elevation. Fig. 3 is an enlarged view of a portion of Fig. 2. Fig. 4 is an enlarged side View of the lower part of the tube which guides the upper carbon and the automatic clutch or tongs.

Like letters denote like parts in each figure.

My invention consists in the arrangement, in an electric lamp, of an automatic tongs, constructed substantially as hereinafter described, to act directly upon one of the carbons, for ad justing the same; and, further, in the combination, with said tongs and a stationary carbon-guiding tube, of a lever connected with said tongs and operated by an electr c-magnet,

essentially as hereinafter particularly de-.

scribed, and pointed out in the claims.

My improved lamp is constructed as follows:

V is a hollow base or box, made of any suitable material.

A is a hollow insulated rectangular metal tube or guide, fastened to the base V, into which the lower carbon is inserted, and may be held in position by a thumb-screw, H, near the top of the tube A.

M is an electro-magnet. R is an armature, hinged at one end to one of the poles of the magnet M. The free end of the armature R is composed of any suitable insulating material, R.

(J is a hollow post, standing on the base V, but insulated from the base V. B is a metal arm, fastened in any convenient manner to the upper end of post 0.

P is a connecting-rod, attached at its lower end by a nut to the free end of the armature R, and at its upper end attached in the same manner to one end of the lever D. The length of the connecting-rod P can be varied for purposes of adjustment by turning either of the nuts N or N at its ends.

D is a lever, pivoted at its center on the fulcrum 3 S S are set-screws passing through the arms of the lever D, by means of which (No model.)

the range of motion of the lever D can. be regulated.

.r is a coil-spring, placed on the upper surface of arm B, and bearing against the inner arm of lever D in such a manner as to keep the inner arm of lever D raised when no current is passing through the lamp.

A is a metal tube, similar to A, for guiding the upper carbon, rigidly fastened to the outer end of arm B, and in a vertical line with tube A. The outer end of lever D is forked, as shown in Fig. 2, so that it incloses the tubeA on three sides.

F F are the jaws of an automatic clutch, similar in principle to the well-known lazytongs. Each jaw F has apin, f, running through it, and extending beyond the sides of the tube A. The jaws F F are connected by two pairs of pivoted links, 0 0, each pair of links being pivotally connected to the opposite ends of the pinsff.

E E are two wires or rods, the lower end of each of which is pivoted to the center of one pair of links, 0, the upper end being fastened to one of the forked ends of lever D.

t t are lugs or stops upon which thejaws F F strike and rest when the clutch is at the bottom of its stroke.

The jaws F F slide in slots cut in opposite sides of the tube A, and are each provided with a spindle, I, running through a guide, K, on tube A, so as to retain the jaws F F in place, while allowing sufficient lateralmotion to enable the jaws to gripe and release the carbon. The carbons are shown in dotted lines in the tubes A A in Fig. 1.

L is a common bindingscrew placed on any convenient part of the post (J. L is a common binding-screw placed on any convenient part of the base V, and is connected by a wire with one end of the wire on magnet M, the other end of the wire on magnet M being connected with tube A.

The post 0 is in free electrical communication with all parts of the lamp supported thereby.

The wires from the electrical machine are attached to the binding-screws L L.

The operation of my improved lamp is as follows: The lower carbon being inserted in the tube A and clamped therein at the proper

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