| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein when a clutch part is held on a clutch case to prevent variation in screw fastening amount and come-out due to surplus rotation, the clutch part becomes large as a whole, resulting in the disadvantage that in a thread fastener reduced in size by disposing a piston below a motor, there is not an enough space below the piston, so that the clutch part cannot be disposed. SOLUTION: The clutch part 21 is reduced in size by providing a hole on the inside of one clutch body 22, providing a clutch shaft 27 rotatable and decreased in diameter at the root thereof in a hole of the other clutch body, and locking the clutch shaft 27 in the hole so that the clutch body 23 does not slip off. COPYRIGHT: (C)2004,JPO
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