Replacement structure of ratchet wrench

Details Replacement structure of ratchet wrench Replacement structure of ratchet wrench

2009-06-29

2011-10-25

Thomas, David B (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Handle clutched to head

C081S060000

Reexamination Certificate

active

08042433

ABSTRACT:
A ratchet wrench includes a parts replacement structure that ensures effort-saved and smooth operation and prevents parts from getting lost. The wrench has a handle having an end forming a head portion that rotatably receives therein a driving collar. A lid plate is fixed to the head portion to retain a pawl member that engages and controls the rotation of the driving collar. The pawl member includes a pusher pad positioned on and movable along a top of the lid plate. A retention block is set at the side of the pawl member opposite to the driving collar to apply a biasing force to the pawl member through a push bar. In this arrangement, the push bar will not get lost when the pawl member disengages from and thus releases the driving collar for replacement.

REFERENCES:
patent: 2978081 (1961-04-01), Lundin
patent: 3659484 (1972-05-01), Scodeller
patent: 5626062 (1997-05-01), Colvin
patent: 6467378 (2002-10-01), Chen
patent: 7082861 (2006-08-01), Chen
patent: 7328633 (2008-02-01), Lin
patent: 2004/0134313 (2004-07-01), Liu

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