| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving machine having high durability of a bumper. SOLUTION: A cylinder has a large diameter part for forming a part abutting on an O-ring when a piston is positioned in the upper dead center in a diameter larger than the other part, and a small diameter part formed below the large diameter part; and is constituted so as to have an interference between the O-ring outer periphery and the cylinder inner periphery, and have clearance between the O-ring inner periphery and the groove outer periphery, even when the piston is positioned in any position up to the lower dead center from the upper dead center. COPYRIGHT: (C)2006,JPO&NCIPI
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