Pneumatic screwdriver

Details Pneumatic screwdriver Pneumatic screwdriver

1998-07-14

2000-07-11

Vo, Peter

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

192150, B25B 23145

Patent

active

060858494

ABSTRACT:
A pneumatic screwdriver incorporates a torque limiter for cutting off the supply of compressed air when the torque reaches a particular threshold. The invention includes a first positive clutch connected to a drive shaft and a second positive clutch connected to the tool. These components have three teeth offset by 120.degree. facing each other with a groove in the teeth in which there is a boss. Balls are inserted between the positive clutches in order to separate them when the torque is reached to shut off the admission of compressed air and then escape from the bosses so that the teeth rub on each other to brake the drive shaft.

REFERENCES:
patent: 3442362 (1969-05-01), Bangerter
patent: 4006785 (1977-02-01), Roll et al.
patent: 4019589 (1977-04-01), Wallace
patent: 4071092 (1978-01-01), Wallace
patent: 4576270 (1986-03-01), Baltz et al.
patent: 5054588 (1991-10-01), Thorp et al.
patent: 5060772 (1991-10-01), Anders et al.
patent: 5156244 (1992-10-01), Pyles et al.
patent: 5505676 (1996-04-01), Bookshar
patent: 5558168 (1996-09-01), Rahm
patent: 5701983 (1997-12-01), Matsumoto

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