Apparatus for measuring the pre-tension of a threaded bolt

Details Apparatus for measuring the pre-tension of a threaded bolt Apparatus for measuring the pre-tension of a threaded bolt

1978-10-26

1980-01-29

Goldberg, Gerald

Measuring and testing

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

Threaded fastener stress

81 5738, G01L 524

Patent

active

041855051

ABSTRACT:
Apparatus for measuring the pre-tension of a threaded bolt which is elongated by means of a tensioning unit and a screwed-in tensioning bolt; a measuring rod is inserted into a central hole in the threaded bolt and the difference in length is determined by means of a length measuring device.
The measuring rod is guided in the housing of the tensioning unit, secured against rotation, and is threaded to engage a threaded bushing. The threaded bushing is longitudinally movable and secured against rotation in a bushing having external teeth. Rotation of the tensioning bolt is transmitted via gears to the threads on the measuring rod and converted into an up or down movement. The measurement may be made when the measuring rod comes to rest at the lowest point of the central hole.

REFERENCES:
patent: 2562831 (1951-07-01), Stone
patent: 2995033 (1961-08-01), Stifano, Jr.
patent: 3162071 (1964-12-01), Biach
patent: 3837694 (1974-09-01), Frisch et al.
patent: 3877326 (1975-04-01), Kock et al.
patent: 3943819 (1976-03-01), Charron
patent: 3995828 (1976-12-01), Orban

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