Bidirectional incremental encoding system for measuring maximum

Details Bidirectional incremental encoding system for measuring maximum Bidirectional incremental encoding system for measuring maximum

1979-09-26

1982-11-09

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324173, 340672, G01B 714, G01P 348, G01P 354

Patent

active

043587356

ABSTRACT:
An impact wrench having an adaptive control system for determining the yield point or some similarly significant point of a fastener assembly by detecting a signal representative of the peak deceleration of the hammer, one embodiment of which is the peak recoil value of the hammer after impacting with the anvil of the wrench, and a signal representative of the angular displacement of the output shaft of the wrench. Yield of the fastener is determined when the respective magnitudes of successive deceleration signals do not exceed the magnitude of a previously stored maximum deceleration signal by a predetermined fixed amount. Upon attaining the yield point or other similarly significant point, the wrench may be allowed to rotate the fastener an additional preselected number of degrees before shutting off.

REFERENCES:
patent: 3710265 (1973-01-01), Gray
patent: 3938112 (1976-02-01), Gee

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