Patent GB-238447-A (GB)
Title: Fire extinguishers
IPC: A62C11/00
Filed: 1924-12-30
Abstract: 238,447. Haddan, R., (Wilbur Walker Manufacturing Corporation). Dec. 30, 1924. Lever - actuated pumps; pipes; suction and delivery reservoirs; multipledelivery piston pumps. - A fire-extinguisher of the type in which liquid is discharged from a container by fluid pump mechanism includes a plurality of pumps in communication with a common discharge. cutlet and means to operate the pumps. simultaneously in opposite directions. In the form shown the container C comprises two parts 16, 17 of which the part 17 has a bulged portion 19. Filling and discharge openings are provided in the part 17. Two pumps consisting of cylinders 23, 24 are arranged within the bulged part 19. A casing 25, which may be cast or of stamped sheet metal, mounted on the ends of the cylinders is divided by a longitudinal partition 26, Figs. 5 and 7, into two chambers 29, 30. Liquid from the container enters the chamber 30 and passes by ball valves 32 to the pumps. Upon the, return stroke. of the pumps the water is expelled through ball valves 35 to the chamber 29 whence it is forced to the outlet 22. Means for conducting liquid to and from the chambers 30, 29 comprises a casing 37, Figs. 6 and 10, secured to the bulged portion 19 of the container and provided with two chambers 39, 40. The chamber 39 is connected by a tube 41 to the chamber 30 and by a pivotally mounted and weighted tube 42, Fig. 1, to the liquid in the container. The chamber 40 is connected by a tube 48 to the chamber 29 and by a tube 49 to the outlet. 22. The pump pistons 50, 51, which may comprise a series of packing washers on a stem, or a metallic head with packing rings, are connected by links 62, Fig. 5, to a'rocker 57 mounted on a stud 58 projecting through a bushing 59, Fig. 6, in the wall of the container C. The rocker 57 is operated by an oscillatable. handle 60 pivoted to the stud 58 and adapted to be locked in inoperative position by the engagement of a lip 65 with a keeper 66. The stud 58 is spirally grooved at 64 to permit air to enter the container to replace discharged liquid. This groove is closed when the handle 60 is moved to inoperative position by a leaf spring 67, Fig. 6, on the handle engaging a fulcrum 68 and causing the stud 58 to slide outwardly and press a packing ring 69 against the bushing 59. When the handle 60 is moved to operative position the stud is moved inwardly by a hook 70 engaging the fulcrum 68. Liquid from the container is positively shut off from the outlet 22 when the handle is in inoperative position by means of a sliding plug valve 73, Figs. 5 and 6, which moves in a casing 74 on the casing 37 and is moved by linkage 78, 82 to close the end of the pipe 48 when the plug 58 is moved outwardly by snapping the lip 65 under the keeper 66. In a modified form of the chamber 37 the valve 73 is arranged to close a bent portion of the chamber 40 instead of the tube 48. The pumps operate alternately to ensure a constant stream of liquid. In operation the outward stroke of each pump draws liquid through the pipe 42, chamber 39. and pipe 41 to the chamber 30. The return stroke expels the liquid through the chamber 29, pipe 48, chamber 40, pipe 49, and outlet 22. The extinguisher may be suspended when not in use by a hand grip 85, or by a spring bracket indicated at 87.