GB Patent 401034 - Improvements in lighting appliances

Description

PATENT SPECIFICATION

. We, TilE GENERAL ELECTRIC COMPANY LIMITED, Of Magnet House, Kingsway, London, W.C. 2, a British company, and Enic LOUIS BAXTER DAMANT, of the same address, a British subject, do hereby declare the nature of this inventioni to be as follows:This, invention relates to lighting fittirgs or appliances more particularly for electric lamps and of the kind including a main reflector for providing indirect lighting and a second reflector arranged below the source to distribute light which passes downwards through the annulaispace between the neck of the main reflector and the lamp-holder. The object of the invention is to provide an improved lighting appliance and to avoid the occurrence of a dark space below the light source.

According to the invention, a lighting appliance of the kind specified comprises a reflector arranged around a light source for producing indirect lighting, al annular reflector of translucent material arranged below the light source, and a shade surrounding the whole, the arrangement being such that some of the light incident on the annular reflector is transmitted through it to the space below.

The appliance or fitting may comprise an opaque bowl reflector supported on a gallery below the light source, a conical translucent reflector arranged below the said gallery, a surrounding shade of 3 annular or other suitable form and means for supporting the said shade from the gallery. The annular shade may be translucent and in the form of a frustum, the height of which is slightly greater than the combined heights of the conical reflector and the bowl reflector.

In one construction of a lighting appli.

401,034 ance in accordance with the invention, an electric lamp is arranged cap downwards in a holder carrying a gallery including three radial arms extending fromi a ring clamped in position by the usual shade ring of the lamp-holder; another ring of larger diameter with holding 50 screws is carried by the three radial arms and serves to secure the neck portion of an opaque hemispherical bowl reflector arranged around the lamp. An open annular space remains between the lampholder and the neck of the bowl.

A conical translucent shade or reflector of opalescent glass is arranged on the same lamp-holder with its mouth downwards, the diameter being greater than that of 60 the annular opening. The radial arms of the gallerv terminate as hooks, adapted to support a wire ring with three rods or links connected to another ring forming part of a shade of vellum or other translucent material, the shade being in the form of a frustum. This shade surrounds the other parts of the arrangement.

Indirect lighting is obtained from the bowl reflector which directs light on to 70 the ceiling, light which escapes downwards between the neck of the bowl and the lamp-holder falls on the conical reflector some of this light being reflected upwards to the surrounding frustum, 75 whilst some is transmitted through the reflector to the space below the appliance and serves to avoid a dark space there.

It will be understood that the invention is not restricted to the precise 80 geometrical form of the two reflectors and shade described.

Dated the 10th day of June, 1932.

For the Applicants, W. G. LIEWELLYN, Chartered Patent Agent.

COMPLETE SPECIFICATION.

Improvements in Lighting Appliances.

We. TDE GENERAL ELECTRIC COMPANY LIMITED, of Magnet House, Eingsway, London, W.C. 2, a British company, and [Price 1/-i -fE'ACG - U ERIC Louis BAXTER DAMANT, of the same address, a British subject, do hereby declare the nature of this invention Application Dove: June 10, 7932. No. 16,447,132.

Complete Left: May 26, 1933.

Complete Accepted: Nov. 9, 1933.

PROVISIONAL SPECIFICATION.

Improvements in Lighting Appliances.

401,034 and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement-

This invention relates to floor standard or the like lighting fittings or appliances more particularly for electric lamps and of the kind including a main reflector for providing indirect lighting and a second 0 reflector arranged below the main reflector for distributing light which passes downwardly through a window or opening in the main reflector. With such arrangements as have been previously used a common disadvantage has been the occurrence of a dark space below the second reflector, and the object of the invention is to avoid such occurrence of a dark space below the fitting.

According to the present invention, in a floor standard or the like lighting appliance of the kind specified and ot the type in which the standard is adapted to support both the main reflector and the second reflector, the outer surface of the second reflector being arranged to extend downwardly from the centre, the said second reflector is formed of translucent material.

so The appliance may comprise an opaque bowl reflector supported on and extending upwardly from a gallery, a conical translucent reflector arranged below the said gallery, a surrounding shade of annular or other suitable form and means for supporting the said shade from The gallery.

The annular shade may be translucent and in the form of a frustum, the height of which is slightly greater than the comr t0 bined heights of the conical reflector and the bowl reflector.

The invention will now be described, by way of example, with reference to the accompanying drawings, of which Figure 1 is a sectional elevation of a lighting appliance and Figure 2 is a plan of the gallery for use in the appliance shown in Figure 1.

In the construction shown of a ligbtin-,, o appliance, an electric lamp 1 is arranged cap downwards in a holder 2 carrying a galley 3 including three radial arms 4 extending from a ring 5 clamped in position by the usual shade ring 6 of the lampholder; another ring 7 of larger diameter with holding screws 8 is riveted to the three radial arms, the screws -8 serving to secure the neck portion 9 of an opaque hemispherical bowl reflector 10 arranged around the lamp. Open spaces 11 remain between the lampholder 2, the neck portion 9 of the bowl and the radial arms 4.

A conical translucent reflector 12 of opalescent glass is clamped, mouth dowr.wards, on the lampholder 2, a rubber ring " 13 separating it from the gallery 3, the diametesr of the mouth of the reflector 1? being greater than that of the neck portion 9 of the reflector 10. Three radial arms 14, extending from the gallery:3 and each comprising a shaped portion 1I-, are secured at their upper ends to a wire ring 16. A shads frame 17, adapted to be covered with vellum or other translucent material in the form of a frustunt, 75 surrounds the other parts of the arransement and is supported 'by a wire ring 18 which rests on th. shaped portions 1.5 of the three arms 14, the wire ring 18 bein:

attaech d to the shade frame by a plurality 80 of members such as 19.

Indirect lighting for a room is provided by the bowl reflector which directs light on to the ceiling; light which escapes downwards through the spaces 11 falls oni the translucent reflector 12, some of this light being reflected upwards to the surrounding shade, whilst some is transmitted through the reflector to the space below the appliance and thus serves to 90 avoid a dark space below the appliance.

It will be understood that the invention is not restricted to the preeise geometrical form of the two reflectors and shade described. 95 Having now particularly described and ascertained the nature of our said invention and in what manner the same is to be performed, we declare that what we