Load indicating nut wrench

Details Load indicating nut wrench Load indicating nut wrench

1977-05-11

1979-07-31

Jones, Jr, James L.

Tools

Wrench, screwdriver, or driver therefor

B25B 2314

Patent

active

041626397

ABSTRACT:
Method and apparatus for tightening a nut and bolt assembly to ensure that the bolt shank is tensioned correctly using a wrench having two relatively movable detector parts carried by the body of the wrench, one part being a cylindrical outer casing which engages the abutment surface non-rotatably, the other part being a stem extending axially from the body and having its outer end engaging the body of the nut and its inner end connected to a holder for a microswitch arranged to cooperate with an actuating member fixed to said outer casing, said microswitch being in an electrical circuit which controls power to the wrench and/or a visible or audible signal.

REFERENCES:
patent: 3645341 (1972-02-01), Amtsberg et al.
patent: 3877326 (1975-04-01), Kock et al.
patent: 3969960 (1976-07-01), Pagano
patent: 4047456 (1977-09-01), Scholz

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