HYDROPNEUMATIC HARPOON GUN FOR SPORTING UNDERWATER SHOOTING Russian patent published in 1997 - IPC

FIELD: hydropneumatic guns for underwater shooting. SUBSTANCE: the gun is loaded in water, after which water is injected in the hydraulic chamber by a plunger-type hydraulic pump. The number of injected portions of water controls the pressure in the pneumonic cell and hydraulic chamber of the pneumatic accumulator. When the trigger is pulled, the sear gets disengaged from the tail piece, which is pushed out by water of the hydraulic chamber actuated by the piston of the pneumonic cell. The harpoon tail piece, at least 60 mm long, is conjugate to the walls of the breech and barrel ducts, and the stroke of the tail piece in the breech and barrel ducts is at least 600 mm. The difference between the diameter of the harpoon rod and the diameters of the barrel and breech ducts is at least 1 mm. Ware in the barrel between the harpoon rod and walls of the barrel duct is ejected through the barrel orifice, whose area exceeds the cross-section area of the barrel duct at least by two times, and through the annular gap between the rod and bore. EFFECT: improved design. 12 dwg, 2 tbl