| 摘要 |
a rack (19) selectively contacting with an output side spur gear (3) for transmitting a torque motor power (1) to a screw bit (10); a variable cylinder (21) making the rack (1) contact with the spur gear (3); a rack cylinder (22) for rotating the spur gear in reverse direction (3); and the screw bit (10). The device enables to maintain proper and correct mounting of a socket bolt whose length of reset screw part is not enough.
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