| 摘要 |
An adjustable ratchet wrench has a housing carried by a handle. The housing has a generally cylindrical chamber which carries a mounting disk which in turn supports three equidistantly spaced jaws. The mounting disk is connected to the handle by a ratchet assembly whose setting determines the direction in which the tool may be turned to turn the nut or other workpiece. The housing also carries a cam disk that engages the jaws and opens and closes them depending upon the direction in which it is rotated. A second ratchet mechanism determines the direction in which the cam disk may be rotated with respect to the mounting disk so as to open and close the jaws. In one embodiment, a power pack, motor and gears are mounted in the handle for automatically driving the mounting disk to turn the work engaged by the handle.
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