US472721A

US472721A - Electric search-light

Info

Publication number: US472721A
Authority: US
Publication date: 1892-04-12
Anticipated expiration: 1909-04-12

Description

. 2 Sheets-Sheet 1.

B. B. WARD. ELECTRIC SEARCH LIGHT.

Patented Apr. 12', 1892.

INVEN TOPI:

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(No Model.)

(No Model.) 2 Sheets-Sheet 2.

B. B. WARD. ELBGTRIG SEARCH LIGHT.

No. 472,721. PatentedApr. 12, 1892.

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I @mm UNrTE STATES A'rEN'r OFFICE.

BARTON BREWER VARD, OF NEW YORK, N. Y., ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE SCOTTV ELECTRICAL MANUFACTURINGr COM- PANY, or NEW JERSEY.

ELECTRIC SEARCH-LIGHT.

SPECIFICATION fOrmng part Of Letters Patent N0. 472,721, dated. April 12, 1892. Application filed January 13, 1890. Serial No. 336.791. (No model.)

To @ZZ whom it may conoci/'11,:

Be it known that I, BARTON BREWER WARD, a citizen of the Dominion of Canada, residing at the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Electric Search-Lights, of which the following is a specification.

My invention relates to improvements in search-lights in which an arc lamp and parabolic reflector are used and contained in a metal cylinder arranged so that the whole may be revolved around a center, depressed, or elevated to any angle from a horizontal position, the object being to provide facilities to tilt and turn the projector from a position beneath its base. I attain these objects by the apparatus illustrated in the accompany ing drawings, in which- Figure l is a side sectional elevation of theA search-light. Fig. 2 is an end View of the same. Fig. 3 is a section of frame supporting the cylinder. Fig. 4 is a section of the turning shaft. y

Similar letters refer to similar parts in the different views.

The baseB and the frame U, pivoted on thev base and held in position by the turning shaft T with the bearings b and b, constitute the main frame-work.

The cylinder S, with hinged doors at each end and with upper and lower projections j and lo, provided with removable caps j and la', constitute theframe-work for holding and protecting the parabolic reflector R and lamp L. The projections j k afford a space for the working up and down of the rods which carry the carbons of the lamp.

In Fig. l, Sheet l, is shown the position of the lamp L in relation to the reflector R and the cylindrical cover S. The cylinder is pivoted at bearings b and b, Fig. 2, Sheet 2, and is free to swing in a plane at right angles to the base from a position below the horizontal to a vertical position. This is. accomplished by pulling downward on the cord C, attached to the cylinder at X and passing across its end over the pulley p and through the turning shaft T. This motion of the lcord imparts to the cylinderamotion concentric with its bearings, thus allowing the ray of light to be projected in any angle on the line of its motion. The face of the cylinder, or the end opposite to which the cord is attached, is made the heavier, so that it will turn back to a horizontal position when the cord is slackened.

In tilting the cylinder in the manner described gives an almost free from friction rapid movement, and it can be locked in any desired position by fastening the cord C to the shaft T.

In Fig. 2, Sheet 2,the base B is shown fastened to the floor and the turning shaft T (shown in dotted lines) passing through it to the frame U and rigidly fastened to it, or, in

reality, forming part of it. This turning shaft is provided with hand-wheel Z and fastened to the frame U, as described, and is free to turn in base B,and it is used to impart a rotating motion to the frame U, carrying the cylinder S, thus adording facilities for moving the face of the projector' in any desired point of the circle.

The construction of the turning shaft T is shown in Fig. 4, Sheet 2, which is a section at point X X, the center holeD being for the cord C and the outer holes e and e the ones through which the electric conductors pass.

The hole D in vthe shaft T, vthrough which the cord C passes, runs the entire lengthof the shaft in its center, while the holes through which the conductors pass start at a point common with hole D and surface of frame U and extend downward and come out of the conductor, insulated as desired, which passes by way of switch g up through the turning shaft on one side by way of hole e into la groove u, (see Fig. 3, section Y and Y, Sheet 2) on one side of the frame U, thence into the cylinder by way of a hole in cylinder-shaft to the lamp L, and from the lamp L out of the cylinder on the other side by the hole in the shaft down the groove in the frame U and through the other side of the turning shaft by the hole e and back to the generator, as indicated by the dotted lines, thus completing the circuit.

What I claim as my invention, and desire as described, with electrical Connection, sub# to secure by Letters Patent, isstantially as and for the purposes set forth. In 2L search-light, the cylinder S, p1ow{ided BARTON BREWER TARDlwlth doors at each end and progectlons j and 5 7o, with removable oeps j Za', in combination Witnesses:

with reflector Rand lamp L, frame U, base B, J. GRAHAM SCOTT,

and shaft T, cord C, and pulley p, all arranged THOS. J. MCLEOD.