Tightening tool

Details Tightening tool Tightening tool

1993-01-22

1994-01-11

Smith, Scott

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

173 20, 173109, 36447419, 364508, 81467, B25B 23147

Patent

active

052772616

ABSTRACT:
A tightening tool includes a hammer for impacting on an anvil which drives a nut etc. A microphone is provided for converting impact sounds of the hammer on the anvil into an electric signal. A counting device counts the number of pulses of the electric signal. A setting device is provided for setting a set number of impacts to be obtained. A switch device compares the counted number of pulses with the set number and stops a motor for driving the hammer when the number of pulses coincides with the set number.

REFERENCES:
patent: 2808916 (1957-10-01), Johnson
patent: 4554980 (1985-11-01), Doniwa
patent: 4699223 (1987-10-01), Noren
patent: 5040734 (1991-08-01), Belchamber et al.
patent: 5170358 (1992-12-01), Delio

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