Ratchet tool having increased driving torque

Details Ratchet tool having increased driving torque Ratchet tool having increased driving torque

2007-12-25

2007-12-25

Lorence, Richard M (Department: 3681)

192 clutches and power-stop control

Clutches

Automatic

C081S063100

Reexamination Certificate

active

11204526

ABSTRACT:
A ratchet tool includes a barrel rotatably engaged into a cartridge and having a gear, two pawls slidably received in the cartridge and each having a base plane and a side plane and two or more teeth biased to engage with the gear of the barrel, and a control ferrule may control the engagement of the pawls with the gear of the barrel. The teeth of the pawls each includes two tooth surfaces having different included angles relative to the base plane of the pawl and relative to the side plane of the pawl, and having different included angles relative to each other, for allowing the barrel to be suitably rotated or driven by the cartridge with an increased driving torque.

REFERENCES:
patent: 2430480 (1947-11-01), Pugh
patent: 5687820 (1997-11-01), Lin
patent: 5974915 (1999-11-01), Chou
patent: 6227077 (2001-05-01), Chiang
patent: 6250183 (2001-06-01), Chiang
patent: 2004/0154439 (2004-08-01), Tuan-Mu

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