GB466367A - Improvements in or relating to street lamp structures - Google Patents

Abstract

466,367. Winding and supporting lamps. KEITH & BLACKMAN CO., Ltd., J., and KEITH, G. March 7, 1936, No. 6887. [Classes 78 (iv) and 78 (v)] In street lamp structures of the type in which the lamp is suspended from a gallowsarm on a supporting column and is movable by lowering and hoisting-gear, the lamp is suspended from a carriage which is movable along an inclined track so disposed that the lamp is maintained clear of passing traffic during raising or lowering. The gallows-arm 2, Fig. 1, is supported by an inclined rail 5, the lower end of which is attached directly to the column 3 by a clamp 10. The lower end may, however, be supported by the outer end of a bracket arm attached to the column. The lamp 1 is suspended from a carriage 8 running on the track 5 by a rope 9 attached to a winch 4. This rope passes over fixed guide pulleys 15, 16 to a guide pulley 18 on the carriage 8 which directs it into a tube 19 carried by a casting 20 surmounting the lamp. After passing downwardly through this tube, the rope passes round a pair of pulleys 21, Fig. 7, mounted on the casting 20, and upwardly through a tube 22 to an anchorage 23 on the carriage. The lamp-shipping mechanism is similar to that described in Specification 399,259 and includes a labyrinth-presenting ring 26 mounted on the casting 20 for rotation about an axis parallel to the rail 5 and engageable with pins 27 projecting inwardly from a casing 28 attached to the bend 17 through which gas is supplied from the hollow arm 2. A slot 30, Fig. 7, in the casing 28 is engaged by a projection 29 on the casting 20 to prevent rotation of the latter while the ring 26 is co-operating with the pins 27 in the initial and final operative movements of the winch. In a modification the rail 5 is replaced by a wire rope tensioned between the arm 2 and one end of a cross-bar attached to the column. A similarly tensioned rope connects the other end of the cross-bar to the arm 2. These two ropes may be continuous, or the second rope may be dispensed with and the first rope attached directly to the column 3. In the case of an electric lamp, current supply conductors are led through the arm 2 and bend 17 and connected to terminal spring prongs in the casing 28. There is sliding co-operation between the prongs and a pair of conducting strips insulated from the casting 20 and connected to the lamp.