Clamping device for providing high twisting forces and low...

Details Clamping device for providing high twisting forces and low... Clamping device for providing high twisting forces and low...

2007-08-28

2007-08-28

Thomas, David B. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

C081S186000

Reexamination Certificate

active

11512131

ABSTRACT:
A clamping device for providing high twisting forces and low damage to a screw device comprises a handle; a driving portion formed with a space; the space including at least two resisting portions and at least two adhesion portions; the resisting portions and adhesion portions being alternatively arranged; each of the connection of the resisting portion and the adhesion portion being formed with a recess for receiving apexes of a screw means so as to prevent the screw means from damage; and each resisting portion having two cambered protrusions at two ends and three sharp teeth between the two cambered protrusions; the apexes of cambered protrusions and sharp teeth being collinear. Furthermore, the driving portion of the present invention can be used to a sleeve so that sleeve has the same function of the driving portion. Thereby it is preferred that there are three resisting portions and three adhesion portions.

REFERENCES:
patent: 3909764 (1975-09-01), Andersen
patent: 4126063 (1978-11-01), Palmer
patent: 5117714 (1992-06-01), Pagac et al.
patent: 5476024 (1995-12-01), Hsieh
patent: 5832792 (1998-11-01), Hsieh
patent: 5860339 (1999-01-01), Mikic et al.
patent: 5904076 (1999-05-01), Siwy
patent: 6029548 (2000-02-01), Hsieh
patent: 6098501 (2000-08-01), Sundstrom
patent: 2004/0221688 (2004-11-01), Liao
patent: 2006/0156869 (2006-07-01), Hsieh

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