Sectionless length adjustment mechanism for tool shank

Details Sectionless length adjustment mechanism for tool shank Sectionless length adjustment mechanism for tool shank

2006-12-12

2006-12-12

Wilson, Lee D. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle or shank

C081S183000, C081S436000

Reexamination Certificate

active

07146885

ABSTRACT:
Disclosed is a sectionless length adjustment mechanism for the shank of a tool (e.g., screwdriver) and for releasably locking the shank in any one of a plurality of positions relative to the handle. In one embodiment the mechanism comprises a sleeve having a front flared end, a spring anchored in the sleeve, a shell including two opposite bars on its surface, and a nut secured to the sleeve. Pulling the shank forward will move the bars outward forward along the flared end to expand the spring. Pushing the shank rearward will move the bars inward rearward along the flared end to compress the spring. Stopping sliding will lockingly engage the shank. Loosening the nut will move the shell forward and expand the spring until the shank is free to slide with the bars disposed at a mouth of the flared end and disengaged from the shank.

REFERENCES:
patent: 3292678 (1966-12-01), Noga
patent: 4586406 (1986-05-01), Howard
patent: 5287778 (1994-02-01), Cook
patent: 6029551 (2000-02-01), Wu
patent: 6601483 (2003-08-01), Wannop
patent: 6622597 (2003-09-01), Chen
patent: 6655240 (2003-12-01), DeVecchis et al.
patent: 6684740 (2004-02-01), Lin
patent: 6722667 (2004-04-01), Cantlon
patent: 6889582 (2005-05-01), Wilhelm
patent: 6901826 (2005-06-01), Huang

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