US1396439A - Lamp - Google Patents

Description

W. KNAPP.

LAMP.

APPLICATION FILED JUNE 30. 1920.

1,396,439. Patented Nov. 8, 1921.

( annon-FM WILLIAM KNAPP, OF B AYONNE, NEW JERSEY.

LAMP.

Specification of Letters Patent.

Patented Nov. 8, 1921.

Application filed June 30, 1920. Serial No. 392,930.

To all 2072 am it may concern Be it known that I. IVILLIAM Kxxrr, a citizen of Germany, residing at Bayonne, Hudson county, State of New Jersey, have invented certain new and useful Improvements in Lamps, of which the following is a full. clear, and exact description.

This invention relates to improvements in electric lighting fixtures. one of the objects being to provide a fixture of the more modern type, in which the lighting effect is more or less indirect, having comparatively few parts, making less handling necessary when assembling the fixture, and also producing a fixture at a comparatively low cost as compared to the expense of assembling similar fixtures as at present constructed.

A further feature of my invention consists in providing a fixture arranged, by the aid of an auxiliary reflecting device, to eliminate the usual spot, on the support for the fixture and over said fixture. The class of fixture to which my invention relates consists of an inverted globe suspended by suitable chains or rods from a support or ceiling. When suspended from a ceiling, these fixtures cast a dark spot, or fail to illuminate the ceiling or support over said fixture. To eliminate the aforesaid dark spot, I provide an auxiliary reflector reversibly supported by the fixture in order that said reflector can be used to cast rays downwardly when the fixture is applied directly to a ceiling. My improved fixture is arranged for suspension from a ceiling, or to be applied directly to a ceiling, the auxiliary reflector being accordingly positioned.

In the accompanying drawing, forming part of this specification,

Figure 1 is a sectional view of my improved fixture, illustrated as suspended from a ceiling;

Fig. 2 is a similar view, partly in elevation, illustrating the fixture as directly secured to a ceiling or the like; and

Fig. 3 is an enlarged sectional detail view of the auxiliary reflecting device, a portion of a globe being also indicated.

As herein arranged, my improved fixture consists of a globe member 4 directly connected to a supporting member 5 of somewhat larger diameter, said supporting member having a reflecting surface 6 produced by enameling the said surface or otherwise. To connect the members 4 and 5, I provide th mem e 5 w th a ne k p t n 7 h ing retaining or set screws 8 passing therethrough and the globe 4 with a neck portion 9 of smaller diameter than the neck 7 in order that said neck 9 can be inserted into neck portion 7 and engaged by the screws 8. As can be seen, the supporting. member 5 is shaped to produce a reflecting medium. To retaln a socket 10, I provide the support 5 with a cross-bar 11 to which said socket 10 18 secured. The numeral 12 indicates a bulb carried by the socket 10, the circuit wires being omitted.

Fig. 1 illustrates the fixture suspended from a ceiling 12' by chains 13, while Fig. 2 indicates the fixture directly connected to the ceiling. To directly connect the fixture, the threaded projection 14 (Fig. 1) is caused to engage a junction-box, which is not shown. This feature, however, is not novel with me, being common practice. When a fixture is suspended from a ceilmg, as illustrated in Fig. 1, there is usually a dark spot immediately above the fixture, for instance at A. To eliminate this dark spot, I provide a dished auxiliary reflector 15, which is located Within the fixture and encompasses the bulb 12. The auxiliary reflector 15 is supported (in this instance by the globe 4 at the neck portion 9, and rests thereon by gravity, in order that said reflector-can be removed and placed upon the globe in reverse position, as indicated in Fig 2. When placed upon the globe, the auxiliary reflector will either cast rays upwardly or downwardly, dependent upon the position of the said reflector. When placed upon the reflector, in the position indicated in Fig. 1, rays of light, from the bulb 12, will be cast upwardly and will illuminate that portion of the ceiling which is usually dark. As heretofore constructed this class of fixture, so far as I am aware, employs no means to cast rays upwardly upon the ceiling directly above the fixture. When the auxiliary reflector 15 is placed upon the globe 4 in reverse position in a fixture which is fastened directly to the ceiling, as illustrated in Fig. 2, rays of light will be cast downwardly to increase the light given ofl by the globe.

y securing the globe 4 directly to the support 5, all rods, clamps or superflous connections are eliminated, thereby producing a much more eflicient fixture, besides reducing the cost of manufacture mate rially.

The neck 9 of the globe is provided with a beading 16 around its upper edge to rest upon screws 8; instead of a beading other means may be provided to accomplish the same result. The neck 9 of the globe is preferably provided with an annular seat or depression 17 to receivethe edge 18 of the reflecting element 15. It will be understood that the globe and auxiliary reflector are usually made of glass.

The reflector 15 is provided with an opening 19 for the passage therethrough of the bulb 12.

Ordinarily in fixtures of this type, the opening 20, in the support 5, the axis of which is coincident with the axis of the globe, is left open; hence the dark spot referred tovwill be produced. As the reflector 15 will substantially fill this opening, rays of light emitted bythe-bulb will be dissipated and illuminate that-portion of the ceiling which is usually dark. The axis of the opening 19, in the reflector, will coincide with the axis of the support 5 and globe 4.

One of the important features of my device is that the fixture is absolutely dust proof, especially when arranged as illustrated in Fig. 2, for 'the reason that the globe 5 and support a are, to a certain extent, at the neck portions thereof, sealed and dust cannot get into the globe.

Having described my invention, what I claim and desire to secure by Letters Patent is In a lighting fixture, a support open at the top and having a reflecting surface and a central opening for the passage of a bulb, a globe detachably supported by the support, the axis of the globe being coincident with the axis of the support, an auxiliary dished translucent reflector having a central opening of suflicient diameter to permit of the passage of an entire bulb, and reversibly supported by the globe, said globe being provided with an annular depression to receive the peripheral edge of the translucent reflector.

Signed at New York city, N. Y., this 25 day of June, 1920.

- WILLIAM KNAPP. lVitnesses:

EDWARD A. JARvIs, MAURICE BLOOH.

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