GB693636A - Improvements relating to containers of compressed gases - Google Patents

Abstract

693,636. Fire-extinguishing. PYRENE CO., Ltd. Jan. 28, 1952 [Oct. 27, 1950], No. 26290/50: Class 47(ii) [Also in Group XXVIII] In a fire-extinguisher comprising a container for fluid under pressure which is released by the fracture of a diaphragm 3, a cutter 12 which is carried by a piston 9 urged downwards by the pressure fluid is held away from the diaphragm by a similar or different fluid trapped between the piston and the diaphragm and released therefrom by remote control means. In one form, Fig. 1, the outlet 7 for the trapped fluid is opened by breaking a tube 8 as by explosive means or electrically heating and melting a fusible disc. Alternatively, a small hole may be made in the diaphragm 3 by a powder charge. In a modification, the outlet is closed by a subsidiary diaphragm which is fractured by a solenoid-controlled piercer. A spring 10 anchored to a pin 11 prevents downward movement of the cutter 12 while the apparatus is being charged. In another form, Fig. 6, a tubular cutter 14 carried by a two-part piston 15, 16 is provided. When the cutter is operated upon release of the trapped fluid, its upper end is opened by limitation of the movement of the piston part 16 by a nut 19 engaging a pistonsupporting spider 18 whereby fluid from the container is delivered through the cutter 14. In a modification, Fig. 8, a tubular cutter 14, carried by a single piston 23 has openings 24 at its upper end to cooperate with an enlargement 25 in the bore of the container neck to allow fluid to flow from the container. In a further form, Fig. 9, a tubular piercer 31 is attached to the top plate 28 of a bellows 29 which contains the trapped fluid.