Speed-selectable screwdriver

Details Speed-selectable screwdriver Speed-selectable screwdriver

1993-08-09

1995-04-18

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 591, 81 5731, B25B 1700

Patent

active

054068665

ABSTRACT:
The drive speed of a drive shaft of a screwdriver is selectable by a user by holding a gear transmission housing. Two sets of pinch rollers are employed to rotate the drive shaft at one speed. When the housing is held, one set of pinch rollers is disengaged from the drive shaft, while the other set is engaged through a step-up gear transmission to rotate the drive speed at a greater speed.

REFERENCES:
patent: 3908487 (1975-09-01), Plaw
patent: 4485699 (1984-12-01), Fuller

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