Apparatus for measuring the pre-tension of a threaded bolt

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress

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81 5738, G01L 524

Patent

active

041855060

ABSTRACT:
An arrangement for measuring the pre-tension of a threaded bolt having a central drill hole. A part is fastened to the lowest point of the drill hole and the difference in length of the part relative to the threaded bolt is determined via a length measuring device. An electric holding magnet, introduced into the hole, is fastened to a cable running from a cable drum and carrying an electromagnet, which, when excited, adheres to the closed hole at its lowest point; the cable is tightened and its length is held constant by a ratchet. The cable drum is movably supported on a tube connected to the threaded bolt in such a manner that, when the cable is loose, its carrier is pushed by a spring surrounding the tube against an upper flange on the tube; a length measuring device borne on the carrier contacts a surface of the tube. The measurement is performed with the cable tightened and its length held constant by the ratchet.

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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