Air cushion snubber apparatus

Details Air cushion snubber apparatus Air cushion snubber apparatus

B - Operations, Transporting

21

J

78/35

B21J 7/02 (2006.01) B21D 24/08 (2006.01) B21J 13/00 (2006.01) B21J 13/08 (2006.01)

Patent

CA 1148387

42 AIR CUSHION SNUBBER APPARATUS ABSTRACT OF THE DISCLOSURE An improved snubber apparatus for an air cushion within a forming press is provided. A floating piston is mounted within the air cushion and defines a snubbing chamber. As the air cushion returns to its top stroke position after yieldably deforming to cushion a member within the forming press, a movable piston within the air cushion contacts the floating piston, forcing it to move in the direction reducing the volume of the snubbing chamber. A check valve means is provided between a cushion chamber and the snubbing chamber which maintains the pressure in the snubbing chamber at a minimum equivalent to the pressure in the cushion chamber. As the volume of the snubbing chamber is reduced, the air trapped within is rapidly compressed to a value snubbing the motion of the air cushion. The snubber valve is provided communicating with the snubbing chamber and maintained in a closed position by the air pressure within the cushion chamber. During the snubbing action, when the air pressure within the snubbing chamber reaches a predetermined value, the snubber valve is opened permitting the air from the snubber chamber to escape through the valve to the surrounding atmosphere. A orifice plug is provided to control the outflow of the air when the valve is open. The relative cross-sectional areas exposed to the air pressure within the cushion chamber and the snubbing chamber on the snubber valve are varied to correspond to the number of cushion chambers in the air cushion.

366170

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