Patent GB-379226-A (GB)
Title: Improvements in lighting fittings
IPC: F21S13/00
Filed: 1932-02-13
Abstract: 379,226. Lamps for floodlighting &c. BENJAMIN ELECTRIC, Ltd., Brantwood Works, Tariff Road, Tottenham, London. Feb. 13, 1932, No. 4359. Convention date, Feb. 16, 1931. [Classes 75 (ii), 75 (iii), and 75 (iv).] Reflectors ; mounting reflector on other reflectors and on lamp casings ; supporting ; ceiling lamps ; lantern door fittings ; handles.- A lamp for use in floodlighting &c. comprises a main concave reflector with a source of light between the centre or focal point of the reflector and the reflector itself, and a front reflector part having an opening which is small compared with the main reflector and through which all the rays from the source of light are emitted in a widely divergent beam. The casing consists of a rear part 1 having a hood 2 which carries the socket 4 of the lamp bulb 6, and a front part 3 having a central hole 3a. The main reflector 7, which is spherical or parabolic, is mounted in the rear casing by a screw 8, and a peripheral flange 7a which fits into a notch in the casing. The front converging reflector 10 mounted in the front part 3 of the casing consists of two concentric spherical surfaces 12, 13 having the light source as centre, the surface 12 being substantially a continuation of the reflector 7. The spherical front glass 14 is held in the opening 3a by spring clips 16, packing 15a being provided. Two eye-bolts 17 are pivoted in downwardly extending members 19 of the rear part 1 of the casing, and pass through ears 21 on the front part 3. An eyebolt 18 pivoted on the rear part passes through a slot in the upper part.25 of the front casing 3. When the thumb nuts 22, 26 are loosened and the bolt 18 pivoted out of the slot, the front part may be rotated about the pivots 20. A ring 26a of jointing material acts as a seal. A Y-shaped supporting member 28, attached to the casing by bolts passing through ears 36 on the latter, is formed with a stem 29 having a longitudinal slot connecting with a circumferential slot 31, ears 32 being provided on each side of the slot so that the stem may be clamped around the pipe 27. In a modification the front part of the casing is provided with a peripheral threaded part which threads into the rear casing. A handle and legs are provided, one of the legs being apertured to be hung over a wall support. A washer between the lamp socket and casing forms an airtight seal. In another form the front and rear reflectors are beaded together to form a continuous reflector, the front reflector having only one spherical reflecting surface, and the rear reflector being parabolical with its focus in front of the light source. The front glass is cemented or otherwise mounted in a ring which is screwed into the front part of the casing. The two parts are held together by screws passing through flanges. A space between the edge of the front reflector and the casing allows the passage of hot gases to the walls of the casing. A ceiling lamp, shown in Fig. 8, comprises a hood 55, which is suspended from the ceiling and has a flange 56 to which the main reflector 7 is secured. The two reflectors 7, 11 are beaded together. The glass part 14 is threaded into the lower reflector. Light escaping through apertures 63 passes through the annular diffusing glass member 60 which rests on the ridge 61 in the upper reflector and is held in. position by a ring 62.