US694435A - Lamp. - Google Patents

Description

L A H P.

(Applcation' led In'. 26, 1901.)

(No Nudel.)

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f//J moan o AUNITED STATES' PATENT OFFICE.

WALTER J. SMART, OF BROOKLYN, NW YORK, ASSIGNOR TO TIIEFIRM OF .IOHN WILLIAMS, OF NEW YORK, N. Y. y

LAIVI P.

SPECIFIGATION forming part of Letters Patent No. 694,435, dated March 4, 1902. Application tiled March 26, 1901. Serial No. 52,887. (No model.)

T all whom, t may concern,.-

Be it known that I, WALTER J. SMART, of the borough of Brooklyn, city and State of New York, have invented a certain new and useful Improvement in Lamps, of which the following is aspecification.

This invention relates to lamp construction, and particularly to the construction and organization of those parts concerned in the atro tachment and support of the globe or feature forming the combustion-chamber of the lamp.

In that type of gas, oil, and vapor lamps designed more especially for the illumination of a zone lying directly beneath the lamp and the r 5 adjacent region and used particularly for the lighting of public conveyances and places and out of doors the lamp is commonly supported from above or, at any rate, in such a manner as to offer little or no obstruction to the light- 2o rays. Such lamps, furthermore, commonly embody a lower transparent member more or less hemispherical in form, which constitutes the combustion-chamber of the lamp and usually has a swinging connection with the latter z 5 to permit this so-called globe to be readily removed and one to be inserted. When such globes are made, as they usually are, with a lip or rim portion of a greater diameter than the body of the globe, the latter can be attached to the rim-fixture, which serves for securing the globe in place bypassing the globe through the xture until the rim of the former engages with the latter. In some cases, however, for the purpose of producing a more ar- 3 5 tistically attractive globe or for other reasons the globe is provided with a body portion of a greater diameter than the rim portion, in

which event it is obvious that attachment cannot be made in this way, for a globe of these proportions cannot be passed through the usual iixture.

My present invention furnishes means forsecuring in place a globe of the latter description which is ecient, simple, presents a satisfactory appearance in respect to the visible yconstructive details, and offers a further advantage in this class of lamps in that in combination with the globe it provides a practically-closed combustion-chamber destitute of passages through which undesirable air leakage might occur into the chamber.

In the drawing accompanying the present specification, Figure l is an elevational view of a lamp embodying my invention, part being broken away the better to illustrate the construction. Fig. 2 is a plan View oi' the same, the upper portion of the lamp being re'- moved.-

Similar characters of reference designate corresponding parts in both figures.

As the present invention relates to the globe and associated portions only of lamps and is limited in its scope tono particular lamp or lamps, I have indicated in dotted lines various more or less important parts typical of parts commonly present in lamps of the general class to which the present invention relates. Thus, for instance, in a general way there is set forth a shade B, sustained by a shade-support 2, which in turn is provided 7o with a supporting-arm 3, holding the lamp in place, C indicating a source of illumination within the lamp.

The globe D, constituting the combustionchamber of the lamp, it Will be noticed, is of a greater diameter at a point removed from the rim portion or portion by which the globe is attached to the rim-fixture 4 than it is at the latter portion, and such larger or body portion is greater in diameter than the corre- 8o spending dimension of that fixture. For securing the globe into this fixture Iprovide by my invention asupporting member (designated in a general way by E) which is adapted t0 pass over the flaring lip or rim 5 of the 85 globe after the neck of the latter has been passed through the fixture, whereupon the member moves inward to engage with the said lip or rim. This member is preferably so formed that when it moves inward, as de- 9o scribed, it will assume the form of a continuous closed ring, thus leaving no spaces for the ingress of air into the combustion-chamber around the globe. This is especially desirable Where other and purposely-designed inlets are provided for feeding air to the combustible. This member E may be advantageously made in the form of anannulus or ring, which to enable its diameter to be changed is split or cross-slotted. In the preferred roo construction shown but one slot is indicated, and to facilitate its contraction the ring is beveled on its lower surface, (see 6,) which surface cooperating with the corresponding surface (see 7) of the shoulder 8, extending from the fixture, serves to close the ring as the parts are pressed downward against each other'. This shoulder 8 holds the supporting member, and hence the globe, from dropping downward, and the shoulder is preferably made in the form of a continuous ange. A retaining-ring F, secured to the rim-fixture and pressing against the globe, holds the latter securely in position, preventing the rattling of the globe, an objectionparticularly noticeable when occurring in railwaylamps. This retaining-ring is conveniently fastened to the fixture by screws or the like, and to allow for varying thicknesses in the globes the screw-openings in the ring may be slotted. (See 8.) Itis obvious also that some soft and non-conducting material might be inserted between the globe and the metalsurfaces, with which it would otherwise contact, to lessen the tendency to crack the former. This rim-fixtu re 4 is shown provided with the usual hinge 9 and catch l0, connecting the fixture to the shade-support 2.

It is evident from the foregoing that there is provided by my present invention a construction which presents a continuous unbroken attachment device for the globe when viewed from below the lamp, which embodies but few parts, yet is efficient and permits the ready insertion of a globe, and one, morel over, not calculated to allow the inleakage of air.

Having described my invention, I claiml. The combination with a globe, of a rimfixture and an independent supporting member consisting of a split ring.

2. The combination with a globe, of a rimfixture an independent supporting member adapted to cooperate with yan inclined snrface on the rim-fixture and be thereby held in engagement with the globe.

3. The combination with a globe, of a rimixture provided with an annular flange and an independent supporting member consisting of a split ring adapted to cooperate with the flange on the fixture and be thereby held in engagement with the globe.

4. The combination with a globe, of a rimiixture, an independent supporting member and a retainingring provided with slotted recesses.

5. The combination with a globe having a body portion of largerdiameter than the outwardly-daring rim portion, of a rim-fixture having an inwardly-projecting flange, an independent supporting member consisting of a split ring adapted to cooperate with the ange of the rim-xtnre and be thereby held in engagement with the globe and a retaining-ring provided with slotted recesses.

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

WALTER- J. SMART.

\Vitnesses:

ANNA T. APPELL, ALEX SIMPSON, Jr.

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