Patent GB-811635-A (GB)
Title: Improvements in or relating to lighting fittings for outdoor use
IPC: F21S8/08
Filed: 1955-07-28
Abstract: 811,635. Lighting fittings. SCHNEIDER, J. J., and KALBERLAH, F. July 28, 1955 [July 30, 1954, Sept. 17, 1954, Nov. 3, 1954, Nov. 22, 1954, May 26, 1955], No. 21771/55. Classes 75(2) and 75(4) [Also in Group XXV] In an outdoor lighting fitting comprising an elongated casing 9 and an elongated transparent closure element, preferably a trough 1, a resilient packing 18 is provided between the engaging edges of the casing and trough and means 16 for clamping the edges together are provided at spaced points inside the fitting and are operated simultaneously by a common operating member located exteriorly of the fitting. The clamps may extend along both longitudinal sides of the casing or as shown in Fig. 3 along one side only, the other side of the trough being secured to the casing by a hinge 3 having a U-shaped arm 19 in which the edge of the trough is inserted. Each clamp 16. Fig. 3, comprises a hookshaped member pivoted on a pin 21 on a lug 22 on a longitudinal shaft 23 mounted on bearings within the casing 9 and extending through an end wall of the casing 9. The exterior end of the shaft is of polygonal shape for operation by a key and is -protected by a bush formed in a depression in the end wall of the casing 9. The pivot pin 21 is so disposed relative to the centre of gravity of the clamp 16 that the latter when released, takes up a position in which its end engages under the inturned edge 2 of the trough. On rotation of the shaft the inturned edge 2 is carried into abutment with the resilient packing 18. The pressure exerted by the clamp is a maximum before the fully closed position of the clamp is reached. The clamp 16 shown in Fig. 5 has a slot 28 through which passes a headed rivet 29 mounted on the casing 9. A part 27 of the clamp is bent normal to the plane of the clamp to provide a supporting surface for the edge 2 of the trough. On rotation of the operating shaft 23 from the position shown in the direction opposed to the arrow 24 a cam 26 on the shaft moves the clamp to the left to clamp the trough to the casing 9. On rotation of the shaft 23 in the direction of the arrow 24 from the position shown the cam 26 causes the clamp to pivot about the rivet 29 to the fully released position shown by the dotted lines. The clamp shown in Fig. 6 comprises a wire stirrup pivoted to a cranked portion 32 of the operating shaft 23 and bent over at its end to form a hook for engaging the edge 2 of the trough. The centre part of the stirrup pivots and slides in a guide 33 when the operating shaft is rotated. The operating shaft instead of extending through the end wall of the casing may be coupled through bevel gearing to a shaft extending through the top of the casing and provided with a handle. The clamp shown in Fig. 9 comprises two bolts 16 pivoted by pins 38 to a disc 34 connected to a shaft extending through the top of the casing and provided with a handle 37 The bolts pass through slots 40 in brackets 39 attached to the casing and notches 42 in the bolts engage in the slots 40 when the bolts are fully extended. A further disc with bolts is coupled to the disc 34 by rods so as to be simultaneously operated. In another construction, Fig. 10 (not shown) the trough is clamped to the casing by the ends of centrally pivoted levers which are operated by a rack pivotally connected to the levers and engaging a toothed wheel rotated by a handle outside the casing. To prevent the trough 1 from falling when the clamps are released two springs 41 are arranged inside the casing to engage under the turned in edge 2 of the trough. A channelled reflector 4, Fig. 3, supporting lamp holders 6, starter socket and switch devices 7 is supported by two nuts 10 on stay bolts 8 screwed into the casing 9. The edges of the reflector abut the undersides of lugs 12 on the casing 9 and one edge is U-shaped and engages with S-shaped projections 14 on the casing to form a hinge for the reflector. The electric supply to the fitting passes through a switch part of which is mounted on the casing 9 and the other part on the reflector 4 so that the supply is cut off when the reflector is swung down.