Patent ID: 7614338
Filing Date: 2009-11-10
Classification: F04B,F05C,F16J,Y10T

Abstract:
1. A piston which is to be movably supported to be accompanied by a piston support member via a piston rod in a cylinder to be reciprocally driven, wherein said piston is formed by a fluororesin, a cylindrical outer peripheral portion of said piston has a thickness of 1 mm or less, and is flexible, said outer peripheral portion has a flange portion in an open end portion of said outer peripheral portion which is closely contacted with an inner face of the cylinder, via an approximately 180-degree folded-back portion, the flange portion is attached to said cylinder, a closed end portion extending along an end face of the piston support member is disposed on the outer peripheral portion which is closely contacted with an outer face of the piston support member, and the piston support member, and the piston rod is directly coupled to the closed end portion through the piston support member.