Tightening apparatus

Details Tightening apparatus Tightening apparatus

1978-08-08

1980-07-08

Ruehl, Charles A.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Threaded fastener stress

73139, B25B 2314

Patent

active

042111200

ABSTRACT:
The preferred embodiment of the invention disclosed in this application includes a wrench, for example an operator powered wrench, for tightening a fastener assembly by the incremental application of tightening force. Also included is a control circuit for detecting a phenomena indicating that the joint assembly in which the fastener assembly is installed has been tightened to its yield point. The control circuit further includes checking means for determining that the fastener assembly is being tightened to assure that when the phenomena is detected, the joint assembly has been tightened to the yield point.

REFERENCES:
patent: 2889729 (1959-06-01), Orner
patent: 3965778 (1976-06-01), Aspers et al.
patent: 4000782 (1977-01-01), Finkelston
patent: 4091664 (1978-05-01), Zerver
patent: 4106176 (1978-08-01), Rice et al.

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