Ratchet tool

Details Ratchet tool Ratchet tool

2011-03-01

2011-03-01

Shakeri, Hadi (Department: 3727)

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

Reexamination Certificate

active

07895921

ABSTRACT:
A ratchet tool includes a head and a handle, a ratchet is received in the space and two pawl sets are respectively received in two recesses defined in the inner periphery of the space. Each pawl set has a pawl and a spring which biases the pawl to be engaged with the teeth of the ratchet. Each pawl has a flat surface defined in the end having the engaging teeth. An operation member has a flange which is rotatably engaged with a groove defined in the inner periphery of the space and the flange includes a pressing surface which presses one of the flat surfaces of the two pawls by operating the operation member. By choosing one of the pawls to be engaged with the ratchet, the ratchet tool can output torque in desired direction.

REFERENCES:
patent: 2193984 (1940-03-01), Rhinevault
patent: 2201827 (1940-05-01), Froeschl et al.
patent: 6044731 (2000-04-01), Hsieh
patent: 6279428 (2001-08-01), Huang
patent: 6408722 (2002-06-01), Chen
patent: 7313987 (2008-01-01), Chen et al.

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