Patent ID: 6286718
Filing Date: 2001-09-11
Classification: B05C,B25B,E04F

Abstract:
In a dispensing gun for use with a cartridge, said gun comprising a frame supporting a piston rod and one or more operating levers connected to the frame and acting on the piston rod, wherein a reversible ratchet mechanism is carried on the piston rod and operated on by said one or more operating levers for reciprocal motion of the piston rod, the improvement wherein the reversible ratchet mechanism comprises a washer or washers slidably engaging around said rod and arranged to be engaged and driven respectively by said one or more operating levers in forward and reverse directions relatively to said piston rod and a pair of springs separated by said washer or washers, whereby upon driving engagement of a washer in a forward or reverse direction the washer is twisted to grip and carry the piston rod in said forward or reverse direction, whereas upon release of the washer it is returned along the rod by a corresponding one of said pair of springs.