Screwdriver

Details Screwdriver Screwdriver

2005-02-08

2005-02-08

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S473000, C173S176000, C173S015000

Reexamination Certificate

active

06851343

ABSTRACT:
A representative screwdriver may comprise a motor, a body, a first spindle, a first clutch member, a tool bit, a second spindle, a second clutch member, a clutch engagement preventing member. The representative screwdriver may be selectively operated in one of a first power transmission mode and a second power transmission mode. In the first power transmission mode, the first clutch member and the second clutch member are disengaged when the reaction torque applied from the work-piece onto the tool bit exceeds a predetermined torque. In the second power transmission mode, the first clutch member and the second clutch member are disengaged when the tool bit moves a predetermined distance away from the body toward the work-piece during the screw-tightening operation. According to the representative screwdriver, the engagement and disengagement of the clutch members during the screw-tightening operation can be assuredly performed in both the operation modes.

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patent: 4310624 (1993-10-01), None
patent: 476999 (1992-03-01), None
patent: 06285769 (1994-10-01), None
patent: 2000237971 (2000-09-01), None

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