Bolt stress detector

Details Bolt stress detector Bolt stress detector

1974-04-02

1976-07-13

Trafton, David L.

Communications: electrical

Systems

Call station

33174L, 73 88F, 73105, 85 62, G01B 728

Patent

active

039697134

ABSTRACT:
A method and apparatus for testing stress on a bolt head or nut having a central portion which deflects along the bolt axis as a function of stress, in which three electrical contacts, for example screws, are mounted in a line on and extending outwardly from a housing member, the two outer contacts being positioned to electrically connect to peripheral portions of a bolt head or nut when the center contact electrically connects to the deflected central portion and the head or nut has the desired pre-load. The outer contacts are connected to one polarity terminal of a battery via respective indicator bulbs while the center contact connects directly to the other polarity terminal so that both bulbs are lit when the contacts are so applied and the peripheral and central portions are in a given relation, preferably a single plane.

REFERENCES:
patent: 1766991 (1930-06-01), Gardner
patent: 2136675 (1938-11-01), Danse
patent: 3481041 (1969-12-01), Oakes
patent: 3561260 (1971-02-01), Reynolds

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