Stroke energy limited motor-driven screwdriver

Details Stroke energy limited motor-driven screwdriver Stroke energy limited motor-driven screwdriver

1976-02-27

1977-11-01

Hohauser, Herman T.

Electricity: motive power systems

Automatic and/or with time-delay means

Time or with time-delay means

318434, H02H 7085

Patent

active

040567621

ABSTRACT:
An energy limiting circuit for the operating stroke of a motor-driven screwdriver energized by alternating current is activated in response to a pulse of current amplitude, which may be the starting current of the motor or the first of a series of current amplitude pulses characteristic of screw tightening impacts produced by an impact-type screwdriver. The energy limiting circuit in a simple case is a timing circuit. For operation with strict reference to the impacting energy, the energy limiting circuit is a pulse counter. Adjustment of the timing or of the pulse counting is provided for setting the tool to the conditions of a particular repetitive task.

REFERENCES:
patent: 3333175 (1967-07-01), Klyce
patent: 3845373 (1974-10-01), Totsu et al.

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