PNEUMATIC UNDERWATER GUN Russian patent published in 1997 - IPC

FIELD: pneumatic underwater gun. SUBSTANCE: gun has barrel, barrel mouthpiece, receiver, piston and grip with trigger mechanism. At loading harpoon is inserted in barrel and enters piston hole with its end-piece. At end of loading, when piston rear seal passes hole in barrel, chamber, connected to receiver through check valve, is formed. With further backward motion of piston, air flows into receiver. Prior to cocking, harpoon with piston moves forward, pressure in sealed chamber drops, and push force in harpoon is reduced. After trigger is pulled and harpoon starts moving piston rear seal passes hole in barrel and receiver air acts on piston. EFFECT: improved design. 3 dwg