Device for tightening a nut on a fastening pin of a nuclear reac

Details Device for tightening a nut on a fastening pin of a nuclear reac Device for tightening a nut on a fastening pin of a nuclear reac

1985-03-25

1986-12-02

Kreitman, Stephen A.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

7386221, G01N 2900

Patent

active

046255540

ABSTRACT:
A tightening wrench (5) carrying a measuring cell (8) freely mounted in the hollow part (4) of a wrench (5) and adapted to bear against an end of the pin (2) subjected to the pretension. A detector emitting and receiving ultrasounds (21) disposed inside the measuring cell (8) is made to bear against the end of the pin (2) by a spring (25) interposed between the cell (8) and the detector (21). The cell (8) itself bears against the end of the pin (2) through the action of a leaf spring (9) carried by the wrench (5).

REFERENCES:
patent: 3969810 (1976-07-01), Pagano
Machine Design, "Ultrasonic Pulser Reveals Bolt Preload", vol. 50, No. 28, p. 52, Dec. 1978.

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