Structure of hand-operated screw driver with high driving speed/

Details Structure of hand-operated screw driver with high driving speed/ Structure of hand-operated screw driver with high driving speed/

1990-10-17

1991-07-23

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Machine

B25B 1700

Patent

active

050333364

ABSTRACT:
Disclosed is a hand-operated screw driver with high driving speed/high torque force alternative selection mechanism. A planet gear transmission mechanism is provided having a linking-up shaft and a transmission shaft at two opposite ends respectively alternatively coupled with a driving shaft, which is driven to rotate by a handle, and an output shaft, which drives a screw driver blade for turning screws. The planet gear transmission mechanism is received inside a casing and controlled to rotate by a shift control member to alternatively change the position of the linking-up shaft with the transmission shaft so as to reduce the torque force and increase the speed or reduce the speed and increase the torque force in driving a screw driver blade to turn a screw.

REFERENCES:
patent: 3992964 (1976-11-01), Osmond
patent: 4846027 (1989-07-01), Lu

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