Control cylinder with free floating piston - in pressure fluid system of resistance welding tongs to reduce noise level as tongs are closed

摘要

Work cylinder (13) for activating the electrode tongs (2) of an electric resistance welding device includes a control cylinder (6) in the fluid feed system. The control cylinder has a free flaoting piston (8) which can move between fixed lower and upper positions and which has a displacement volume less than that of the full movement of the work piston (11). The piston (8) has a permanently open valve bore (10) which allows the controlled passage of pressure fluid from one side to the other side of the piston.