Electronically controlled screwdriver with quality check indicat

Details Electronically controlled screwdriver with quality check indicat Electronically controlled screwdriver with quality check indicat

1983-05-13

1986-02-18

Chin, Gary

Boots, shoes, and leggings

29407, 81467, 81480, 173 12, B25B 2314, G06G 748

Patent

active

045716960

ABSTRACT:
Backwards counters (11,12) are preset with upper and lower limits of the angle through which screws are to be driven, the counters being loaded when a certain value of torque is reached, at which time counting down begins with each increment of rotary angle. When the operation is completed in the usual way after reaching a limit value of torque, the increasing interval between count pulses is detected by a delay circuit (7) and counting is stopped. A logic circuit (15) shows whether the screw connection is satisfactory or whether it is underdriven or overdriven.

REFERENCES:
patent: 4104778 (1978-08-01), Vliet
patent: 4106176 (1978-08-01), Rice et al.
patent: 4179786 (1979-12-01), Eshghy
patent: 4284955 (1981-08-01), Beno et al.
patent: 4344216 (1982-08-01), Finkelston
patent: 4413396 (1983-11-01), Wallace et al.

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