Ratchet screwdriver

Details Ratchet screwdriver Ratchet screwdriver

2007-07-03

2007-07-03

Meislin, D. S. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

C081S063100

Reexamination Certificate

active

11436773

ABSTRACT:
A screwdriver includes a shaft fixed to a handle and having two first pawl-receiving grooves and two second pawl-receiving grooves. Two first pawl plates and two second pawl plates are disposed correspondingly in the first and second pawl-receiving grooves. Each of the first or second pawl plates has a swingable end movable between a first position, where the swingable end is biased to engage one ratchet tooth, and a second position, where the swingable end is released from the ratchet tooth. A switching ring sleeved on the shaft has actuators to move the respective first and second pawl plates to the second position.

REFERENCES:
patent: 2013765 (1935-09-01), Richardson
patent: 6047802 (2000-04-01), Huang
patent: 6658970 (2003-12-01), Shiao
patent: 6854363 (2005-02-01), Ping
patent: 6997084 (2006-02-01), Gao et al.
patent: 7036399 (2006-05-01), Gao et al.
patent: 7047843 (2006-05-01), Huang
patent: 2002/0194964 (2002-12-01), Huang
patent: 2003/0110901 (2003-06-01), Shiao
patent: 2007/0012142 (2007-01-01), Shiao

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