| 摘要 |
A device for gripping a stud to unscrew the stud includes a tubular housing. The housing has an axial bore with a plurality of cam surfaces formed in the bore. A cage is carried in the bore. The cage has a number of windows, each located adjacent one of the cam surfaces. A jaw is carried in each window of the cage. Each jaw has an outer side that mates with one of the cam surfaces and an inner side containing teeth for gripping the stud. The cam surfaces will move each jaw radially between inner and outer position when the housing rotates relative to the cage. A spring urges the jaws to the outer position.
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