Abstract: A rivet setting tool for setting blind rivets and/or pins with setting rings comprises an actuating assembly operable to impart an axial movement to the pulling pin for setting the rivet. The actuating assembly has a piston-cylinder arrangement comprising a pressure piston and a working piston movable in the direction for pulling the pulling pin during the rivet-setting operation by a substantially incompressible fluid pressurized by the pneumatically actuated pressure piston. The working piston is moved back in the opposite direction to the pulling direction after the setting operation. The escape of air from the pneumatic actuation assembly of the pressure piston in the return movement is promoted by a venting device. The flow resistance of a passage between the pressure piston and the working piston is different during movement in the pulling direction from that during the return movement.

Abstract: A manually actuable blind riveting tool comprises a housing carrying a sleeve member at the front end thereof. Fixed in the front sleeve member is a mouthpiece member for accommodating a pulling mandrel of a blind rivet while a collet for clamping the pulling mandrel is arranged in the front sleeve member behind the mouthpiece member. The collet is connected to a movable pulling plunger which extends through the housing of the tool and which in its interior has a discharge passage for receiving mandrels after they have been torn off a respective rivet. Two pivotal levers are mounted on the housing for applying an axial force to the pulling plunger to produce a stroke movement thereof during the actual riveting operation. The stroke movement of the pulling plunger is adjustable by a variation in the spacing between the mouthpiece member and the collet.