US498570A

US498570A - Suspension device for electric lamps

Info

Publication number: US498570A
Authority: US
Publication date: 1893-05-30
Anticipated expiration: 1910-05-30

Description

(No Model.)

J. J. RENEHAN. SUSPENSION DEVICE FOR BLBGTRIG LAMPS.

No. 498,570. Patented May 30, 1893.

UNITED STATES PATENT OFFICE.

JAMES J. RENEHAN, OF NEW BRITAIN, CONNECTICUT.

SUSPENSION DEVICE FOR ELECTRIC LAM PS.

SPECIFICATION formingpart of Letters Patent No. 498,570, dated May 30, 1893.

Application filed September 29, 1892. Serial No. 447,239- (No model.)

To all whom it may concern:

Be itknown that I, JAMES J. RENEHAN, of New Britain, in the county of-Hartford and State of Connecticut, have invented a new Improvement in Suspension Devices for Electric Lamps; and I do hereby declare the following, when taken in connection with accompanying drawings and the letters of reference marked thereon,to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, m

Fi ure 1, a view in side elevation of a device constructed in accordance with my invention, showing the lamp in its raised position by full lines, and in its lowered position by broken lines; Fig. 2, a broken view of the outer end of the arm showing the lamp-can rier thereat and therefore in its normal position; Fig. 3, a detached plan view of the lampcarrier; Fig. 4, a detailed View of the upper end of the mast; Fig. 5, a detached-view of the spider applied to the mast-arm.

My invention relates to an improvement in that class of suspension devices for electric lamps, which comprise a mast, a mast-arm, and rigging therefor, the object being to provide for such a device, a simple, durable, con- Venient and effective rigging, designed with special reference to enabling the lamp to be raised and lowered for attention and repair, Without interference with the overhead trolley-wires of street railway systems, and without being hampered by, or hampering, surface traffic.

A further object of the invention is to improve the mast and mast-arm in stability, and convenience of construction.

With these ends in view, my invention consists in the combination with a mast and a mast-arm, of rigging therefor, including an endless cable, guides therefor located at the intersection of the mast and arm, and at the outer end of the arm and the lower end of the mast, and a lamp-carrier interposed in the said cable, and constructed and adapted to ride over the guide, which is thereto ofiset, at the intersection of the mast and arm whereby the lamp is caused to substantially follow the said mast and arm in being raised and lowered, when it takes an angular path.

My invention further consists in certain details of construction and combinations of parts as will be hereinafter described and pointed out in the claims.

The mast A, is provided at a point near its.

upper end, and on the side from which the electric-lamp B, is to be suspended, with a suitable bracket C, which receives the inner end of the hollow arm D, the same inclining from its outer end inward, and being provided at its said end with a bead or block E, carrying a pulley F, over which the endless cable G, runs. A similar pulley H, is mounted in the bracket C, to receive the cable as it emerges from the inner end of the arm D, the

pulley H, being therefore located at the juncture of the inner end of the arm with the mast. Near the same point also, are located two flying pulleys I I, mounted in a block J, which is located at the-outer end of a stem K, the inner end of which is attached to the inner end of the mast-arm D. The cable G, also runs over these pulleys. I would have it understood, however, that I do not limit myself to employing two pulleys in this place, nor to mounting them or locating them just as shown and described, but they must be located at or near the juncture of the inner end of the mast-arm with the mast. The cable G, also passes over a pulley L, which is mounted, as herein shown, in the upper end of a counter-weight M, having at its lower end a chain N, by means of which it is normally connected with a hook 0, located in the lower end of the mast. A small block or bead 0, is applied to the cable in right position so that when the lamp has passed the flying pulleys in being lowered, it will engage with the pulley L, and bring the counter-weight into play for controlling the straight downward movement of the lamp, as will be more fully described later on. In

this construction the pulley L, does not aling against the opposite faces thereof. By

oifsctting the arms Q and R, from the bar S, the same is permitted to run over the flyingpulleys I I, without disturbing the lamp, the said pulleys being, as shown, set at an inclination to both the mast and mast-arm.

The extreme upper end of the mast is furnished with a cap T, firmly secured in place, I

and provided on top with a transverse eye t, WhlOh receives a cross-arm U, adapted in the usual manner for the attachment to it of electric wires. A trussrod V, extends from this cap to the block E, situated at the outer end of the mast-arm D, whereby the said arm is supported. Another truss-rod W, extends from the cap to the outer end of a brace X, which is secured at its inner end to the mast at a point thereon about opposite the attachment thereto of the bracket 0, the said brace X, being slightly inclined from its inner end outward, from the horizontal. A trussrod Y, leads from the outer end of the said brace downward to the mast, which is thus stifiened and prevented from bending by the co-operation of the said truss-rods W and Y,

and the brace X, all of which parts are located at a point opposite the arm D, which imposes a strain upon the mast. The mastarm is also braced by means of three rods connected at their inner ends with the mast, and at their outer ends with a spider Z, secured to the mast-arm about midway of its length, only two of these rods b and 0, being shown, the other rod, which is not visible, corresponding to the rod 0. to this particular way of constructing and bracing the mast and mast-arm, as the same is not essential to the carrying out of my invention, so far as the manipulation of the lamp is concerned.

Under my invention, the lamp takes an angular path moving substantially in line with the mast arm and mast, making a sharp 1 change of direction when it arrives at or near 2 Thus, to

l and mast-arm, a flying-pulley also located at the point of their intersection. lower the lamp for trimming it, or for any other attention that it may need, the outer portion of the cable is pulled downward, until the lamp -carrier has passed over the fly I ing-pulleys, at which time the bead or block E, will have been brought into engagement with the pulley L, mounted in the counterweight. The chain N, being then detached from the hook O, the counter-weight is brought into operation for controlling the descent of the lamp,which comes down into the position shown by broken lines, while the counterweight ascends close to the mast, into the position in which it is shown by broken lines.

Ido not, however, limit myself The lamp having been trimmed, or otherwise attended to, the inner portion of the cable is grasped and pulled upon with just enough force to cause the counter-weight to descend, and the lamp to rise until its carrier passes the flying pulleys. The chain N, is then hooked onto the hook O, and the inner portion of the cable pulled upon, causing the lamp to move outward from the flyingpulleys to the outer end of the mast -arm, in a line parallel .therewith. By handling the lamp in this manner, I avoid interference with the trolley-wires of street-railway systems, so that traffic is not impeded at all while it is being attended to, nor is that operation hampered by traffic.

I would have it understood that in carrying out my invention I do not limit myself to the exact construction herein shown and described, but hold myself at liberty to make such changes and alterations therein as fairly fall within the spirit and scope of my invention. Thus,I would have it understood that I do not limit myself to the use of pulleys for the endless cable to pass over at the outer end of the mast-arm, at the intersection thereof with the mast, nor at the lower end of t 'he mast, for I might in place thereof, use guides of some other form. I am aware, however, that it is not broadly new to rig a suspension device for electric lamps so that the lamps will travel in an angular path following the arm and mast.

Having fully described my invention, what I claim as new, and desire to secure by Letters 7 l arm, an endless cable passing over the said pulleys, and a lamp-carrier interposed in the said cable, and adapted to run over the flying pulley, substantially as set forth.

2. In a suspension device for electric lamps, the combination with a mast and mast-arm, of rigging therefor including a pulley at the outer end of the mastrarm, at the lower end of the mast, at the intersection of the mast or near the intersection of the mast and mastarm, an endless cable passing over said pulleys, a lamp-carrier inserted into the said cable, and adapted to run over the said flyingpulley, a counter-weigh=t carrying the pulley at the lower end of the mast-arm, and adapted to be connected to and disconnectedfrom the same, and a block or bead attached to the cable to co-operate with the said counter-weight, substantially as set forth.

3. In a suspension device for electric lamps, the combination with a mast and a mast-arm, of an endless cable applied thereto, and substantially following the lines of the said mast specification in the presence of two subscriband arm, and a lamp-carrier inserted into the ing witnesses. said endless cable and consistingof a straight bar virtually forming'a continuation of the v JAMES RENEHAN' 5 cable, and an ofiset from the said bar to carry Witnesses:

a lamp, substantially as set forth. 7 W. D. O. BOGGS,

In testimony WhGfGOf I have signed this ALEXANDER S. INGRAM.