Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1983-02-16
1985-03-05
Yost, Frank T.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
7386234, 81469, 81477, B25B 2314
Patent
active
045025495
ABSTRACT:
A helical spring couples a drive shaft geared to the motor with the work spindle. With this arrangement hard screwdriving operations can be extended in time so that time is added for the drive motor to come a stop after it is switched off. Transducers are provided for measuring the torque at which motor switch-off occurs, and also the cumulative angle of rotation, the latter for detecting defective screws. No switchdown of the drive speed is necessary before the screw is driven home.
REFERENCES:
patent: 1111848 (1914-09-01), McCoy et al.
patent: 1946100 (1934-02-01), Norton
patent: 2228032 (1941-01-01), MacGregor et al.
patent: 3970151 (1976-07-01), Workman, Jr.
patent: 3982419 (1976-09-01), Boys
patent: 4328871 (1982-05-01), Gluskin
patent: 4418765 (1983-12-01), Mori et al.
Hornung Friedrich
Jundt Wolfgang
Sch/a/ dlich Fritz
Vogt Hans-Joachim
W/u/ nsch Steffen
Phan Hien H.
Robert & Bosch GmbH
Yost Frank T.
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