Patent ID: 7748690
Filing Date: 2010-07-06
Classification: B23B,B23Q

Abstract:
1. A quick-action cylinder with a safety device to prevent blocking of a draw-in nipple, comprising a housing having a center bore receiving the draw-in nipple; at least one locking member disposed in the housing and adapted to engage with the draw-in nipple; a spring assembly disposed in the housing in at least one spring compartment, said spring assembly applying a spring force to urge the least one locking member into contact with an exterior periphery of the draw-in nipple for locating the draw-in nipple in the center bore, a locking piston disposed in the housing and operative to oppose the spring force for unlocking the draw-in nipple, at least one relief bore extending between the at least one spring compartment and a clearance space having a lower pressure than the spring compartment, and a pressure element arrange in a region of the relief bore and adapted to move into an open position in the event of an overpressure in the spring compartment.