Compound screwdriver head

Details Compound screwdriver head Compound screwdriver head

2008-01-29

2008-01-29

Thomas, David B (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

C081S436000

Reexamination Certificate

active

11306712

ABSTRACT:
A compound screwdriver head, which comprises a first working portion and a second working portion of the same size, the first, second working portion of the bigger size is used for screwing and unscrewing a bolt of bigger, smaller size respectively, so that different sizes of bolts can be locked and unloaded by one screwdriver. Thereby this invention is not only can save the structure of the bolt, but also can prolong the life of the bolt.

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patent: 3207196 (1965-09-01), Stillwagon, Jr.
patent: 4325153 (1982-04-01), Finnegan
patent: 6128983 (2000-10-01), Arnn
patent: 6378406 (2002-04-01), Totsu
patent: 6397710 (2002-06-01), Baker
patent: 6584876 (2003-07-01), Totsu
patent: 7077038 (2006-07-01), Toyooka et al.
patent: 2002/0029666 (2002-03-01), Totsu
patent: 2003/0159551 (2003-08-01), Hughes
patent: 2005/0172762 (2005-08-01), Suzuki

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