| 摘要 |
PROBLEM TO BE SOLVED: To prevent a tightener from being falled out even when a socket is in an arbitrary posture, and to improve the workability. SOLUTION: In the socket in which a plurality of engagement members 2 to be engaged with a head part Ba of a bolt B are movably supported in the radial direction by a tip part of a socket body 1, a plurality of seats 4a1, 4a2, 4a3 which are abutted on an outer side surface in the radial direction of each engagement member 2 and different in the position in the radial direction from each other are juxtaposed in the circumferential direction on an adjustment sleeve 4 adjustable in turn with respect to the socket body 1 so that various bolts B different in size of the head part Ba can be tightened, a cylinder 8 is provided in the socket body 1, a cam 9 connected to a piston 8a in the cylinder 8 through a rod 8b is provided, and a plurality of engagement members 2 are moved in the radial direction by advancing/retracting the piston 8a through the cam 9. After the bolt head part Ba is inserted between a plurality of engagement members 2, these engagement members 2 are moved inward in the radial direction by the movement of the piston 8a, and the bolt head part Ba is held by these engagement members 2.
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