Screwdriver

Details Screwdriver Screwdriver

1986-03-10

1986-12-30

Schmidt, Frederick R.

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

81469, 81472, 81473, B25B 23151

Patent

active

046319921

ABSTRACT:
A power drive screwdriver that is constructed to automatically stop when a predetermined torque is reached. The screwdriver includes a housing having a pneumatically driven motor therein and an output shaft that is linked to the screwdriver bit through a releasable clutch. A control valve is positioned in the housing to control air flow to the motor. The position of the valve is controlled by a rod that extends through the shaft. A transverse slot extends through the shaft intersecting the bore therein and the transverse slot contains a pair of balls that are retained within the slot by a sleeve encircling the exterior of the shaft. Further, a reset member engages the screwdriver bit and also engages the balls to displace the balls in the slot in a direction to open the valve. When the predetermined torque is encountered, the sleeve moves upwardly, permitting the balls to separate and thereby letting the valve rod move to permit the valve to close.

REFERENCES:
patent: 3289715 (1966-12-01), Groff et al.
patent: 3596542 (1971-08-01), Wallace
patent: 3811513 (1974-05-01), Wezel et al.

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