Pneumatic screwdriver with torque responsive shut-off

Details Pneumatic screwdriver with torque responsive shut-off Pneumatic screwdriver with torque responsive shut-off

1977-03-09

1978-01-31

Staab, Lawrence J.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

192150, B25B 2314

Patent

active

040710920

ABSTRACT:
A pneumatically powered tool for setting of threaded fasteners, having an axially movable clutch assembly and a fastener drive spindle both of which are coupled for rotary motion to effect fastener run-up. Upon attainment of a predetermined torque load on the drive spindle, the clutch assembly and drive spindle are intermittently uncoupled by action of a ball being forced up a cam ramp, whereupon a latch pin is activated to initiate seating of an air inlet valve, thus terminating tool operation.

REFERENCES:
patent: 2964151 (1960-12-01), Eckman
patent: 3275116 (1966-09-01), Martin
patent: 3477521 (1969-11-01), Kiester et al.
patent: 3612236 (1971-10-01), Fernstrom et al.
patent: 3766990 (1973-10-01), Eckman et al.
patent: 3811513 (1974-05-01), Wezel et al.
patent: 3993145 (1976-11-01), Findeli
patent: 4006785 (1977-02-01), Roll et al.

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