Tightening apparatus

Details Tightening apparatus Tightening apparatus

1977-07-25

1980-01-29

Pate, III, William

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

73139, B23Q 506

Patent

active

041857011

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: 3693726 (1972-09-01), Hornig
patent: 3835934 (1974-09-01), Schoeps
patent: 3920088 (1975-11-01), Dudek
patent: 3962910 (1976-06-01), Spyridakis
patent: 3975954 (1976-08-01), Barnich
patent: 4026369 (1977-05-01), Ulier

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