| 摘要 |
PCT No. PCT/SE97/00409 Sec. 371 Date Sep. 10, 1998 Sec. 102(e) Date Sep. 10, 1998 PCT Filed Mar. 11, 1997 PCT Pub. No. WO97/33722 PCT Pub. Date Sep. 18, 1997A power nutrunner includes a planetary reduction gearing (12) and a torque limiting release clutch (13) disposed between a ring gear (25) of the reduction gearing (12) and the tool housing (11), wherein the ring gear (25) is tubular in shape and has an outer annular shoulder (41) at its one end carrying cam teeth (42) for cooperation with a spring biased thrust element (45) via balls (43) and cam surfaces (44). The thrust element (45) encircles the ring gear (25) and is biased by a pretensioned spring (53) which is backed by an adjustable support (52) including a rotatable screw element (70) connected to the housing (11) and provided with gear teeth (74) to be engaged by a setting tool (80) inserted through a front opening (79) in the housing (11).
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