GB191328432A - Chemical Fire Extinguisher. - Google Patents

Abstract

28,432. Graaff & Co., W. Dec. 9, 1912, [Convention date]. Extincteurs; chemicals and substances. - Relates to extincteurs of the type in which the pressure gas is generated in a separate inner vessel, from which it escapes and forces out the extinguishing - liquid from the main container. In the construction shown in Fig. 1, the removable inner vessel k is divided by a perforated plate m into two chambers, the lower containing alkaline solution p and the upper a glass vessel o of acid, above which is a perforated plate t surmounted by a lead &c. plate n tightly closing the vessel k. A spring- pressed bolt s is driven inwards to pierce the plate n and break the vessel o, and the gas escapes through perforations q into the main container, which may contain carbon tetrachloride. In the construction shown in Fig. 5, the acid-vessel o is placed in a metallic casing w, which has at its lower end an opening closed by a lead or other plate y and is stayed from the walls of the vessel k by springs x. When the percussion bolt is operated, as in the other construction, the sealing-plate n is pierced, and the casing w is forced downwards against a pointed device v, which pierces the plate y and opens the vessel o. In a modification, the chemicals are separated by a non - perforated plate m adapted to be pierced when a bolt is depressed. The gases may be generated by mixing sodium peroxide and water; or an explosive mixture, such as gunpowder, may be employed. The discharge pipe d may be fitted with a handle and a spring-pressed valve having an operating-handle.