Patent ID: 6386012
Filing Date: 2002-05-14
Classification: B21D

Abstract:
A device for reforming a bellows for use in a heated atmosphere, said bellows being a metal pipe having a plurality of bulges formed therearound, said device comprising:a base member; a first clamp device fixedly mounted on said base member, said first clamp device having a first hydraulically actuated clamping means which clamps one tubular end of said bellows when actuated; a second clamp device movably mounted on said base member, said second clamp device having a second hydraulically actuated clamping means which clamps the other tubular end of said bellows when actuated; a hydraulic power source which hydraulically actuates said first and second hydraulically actuated clamping means when assuming ON condition; and an electric moving device which moves said second clamp device toward and away form said first clamp device when electrically energized, wherein each of said first and second hydraulically actuated clamping means comprises: a hydraulic actuator having an output plunger, said output plunger having a tapered leading end; a tubular housing in which said output plunger is axially movably received; a plurality of clamp pieces installed in said tubular housing in a manner to surround the tapered leading end of said output plunger, each clamp piece having a tapered inner surface which can mate the tapered end of said plunger; an O-ring received in an annular groove which is formed in the clamp pieces; supporting members installed in said tubular housing in a manner to surround a major portion of said output plunger, each supporting member supporting one end of the corresponding clamp piece; and a circular cap installed in said tubular housing and put on the clamp pieces.