US150491A

US150491A - Improvement in railroad-car lamps

Info

Publication number: US150491A
Authority: US
Publication date: 1874-05-05
Anticipated expiration: 1891-05-05

Description

w.H,s`M1TH. -Railroad-[Bar Lamps.

Patented May 5,1874.

No. lr50 UNrrnn vStilsn'rns Pn'rnnr @Enron 'VILLARD H. SMITH,y OF BROOKLYN, NEW YORK.

IMPROVEMENT IN, RAILROAD-CAR LAMPS,V

Specification forming part of Letters Patent No. 150,491, dated May 5, 1h74; application filed December 18, 1872.

l To all whom it may concern:

Be it known that I, WILLARD H. SMITH, of

` the city of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Railroad- Car Lamps; and 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, making a part of this specification.

This invention isin the nature of an improvement in lamps designed for use in railroad-cars 5 and the invention consists in the attachment of the globe of the lamp to the gallery and smoke-tube by elastic screws, in such manner as will enable the globe to be readily removed when broken, or for the purpose of cleaning the same. The invention further consists in providing the`screw-stops Y constructed, for the reason that the globe is cemented to the metal, and until the cement l is removed, it is impossible to replace the broken globe by a new one. To obviate this difliculty is one of the principal objects of this invention.

In the accompanying sheet of drawings, Figure 1 is a vertical section of my lamp; Fig. 2, a top view of same, showing elastic stop in section 5 Fig. 4, side View of screw with swivelpoint on rubber tip. K v

Similar letters of reference indicate like parts in the several figures. l

A represents a lamp, which may be of any desired size and shape, but preferably of a size and shape designed for use in railroadcars. Secured to this lamp, in any desirable manner, are four lugs, a a a a'. Surrounding these lugs is a gallery, O, having lugs b b b b formed thereon, which accurately t into the spaces between the lugs c6 a a c on the lamp A, so that when the lamp is placed within the gallery C the lugs c a a a on the lamp A will be above, and will rest upon the lugs on the gallery, holding it in place. The globe B may be formed with a small flange or lip around its base, and also around its upper orifice. Passing through lugs d d d d, cast with the gallery against breaking the globe when the screws are forced in, and also to compensate for any expansion of the globe by heat when the lamp is lighted, thus preventing fracturing the,

same. The base of the smoke-tube is also formed with lugs g, through which pass screws h, having a small elastic or yielding plunger, i, passing through them, so that as the screw is forced inward the end of the plunger will abut against the glass with a yielding pressure holding it in place; but the stops with rubber tips may be there used also.

My lamp being constructed as above described, it will be clearly seen that in case it should be necessary for any reason'to remove the globe, it is simply necessary to disconnect the upper and lower screws therefrom, when the globe may be readily detached from the gallery and smoke-tube, and a new globe replaced by inserting the base within the gallery, and the top within the base of the smoke-tube, and screwing in the stops until their points are brought snugly against the globe, when the globe will be held firmly in place, and yet the elastic pressure of the stops on it will prevent its being broken, either from screwing in the stops too tightly, or from eX- pansion of the globe from heat when the lamp is lighted. The gallery C has also lugs g, into which are screwed, or otherwise secured, uprights for supporting the reflector E. These uprights have plates afiixed to them for the purpose of attaching the lamp and reiiector A to the roof of the car, or otherwise, by means of screws.

The advantages arising from the use of the cushion rubber-headed screws are, first, that the screw or met-al fastenings cannot be pressed or ground against the glass, so as to break it by the expansion of the glass or by the force of the screw; second, that when the globe is fastened in its place by these cushion-headed screws it cannot jar loose by the screw turning round, as all metal connections will do by the jar of the car, as the rubber cushion adheres to the glass and prevents its turning around.

The serew h, which fastens the metal smoketube, is provided with shoulder or stop, which prevents the screw from being forced in so as to bring the bolts to a solid bearing, lbut leave it free, so as to give with the expansion of the glass, and at the same time hold the smoketube rmly to its pla-ee.

Having; thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of elastie screw-stops e h, with a lamp and smoke-tube, arranged substantially as described, for holding' the glass globe at top and bottom Without danger of breakage, and for permitting its detachment, as set forth.

2. The screw-stop e, having the rubber enshions secured at the ends bearing upon the glass globe, substantially as and for the purpose set forth.

' W. H. SMITH. Witnesses:

H. L. WATTENBERG, G. M. PLYMPTON.