1975-05-12
1977-01-04
Britts, Ramon S.
85 87, F16B 3102
Patent
active
040006816
ABSTRACT:
A mechanical device for visually indicating the tension in a monitored bolt or the like. The device will visually indicate if the monitored bolt is subject to greater than a predetermined maximum tension or is subject to less than a predetermined minimum acceptable tension. The device will also give visual indication, generally proportional to the tension in the monitored bolt, when the tension in the monitored bolt is at less than the predetermined maximum but more than the predetermined acceptable minimum. The device includes a spring washer, preferably a helical washer, which is inserted inbetween the head of the bolt and the surface or backing plate against which the head of the bolt will bear for substantially resilient compression therebetween. The washer is selected with a spring constant such that the washer will be substantially flattened between the bolt head and the plate only upon the application of a tension to the bolt exceeding the predetermined maximum. The washer includes a pivot member, preferably a pivot pin, which will move axially away from the plate as the washer expands in response to less than predetermined maximum tension in the bolt. The pivot member will be axially spaced a known distance from the plate when the tension in the bolt is equal to the predetermined acceptable minimum tension. An elongated indicating member, or flag, is pivotally mounted at one end thereof to the pivot member.
REFERENCES:
patent: 1020748 (1912-03-01), Dobson
patent: 2725843 (1955-12-01), Koski
patent: 2781687 (1957-02-01), Knocke
patent: 3060731 (1962-10-01), Adise
patent: 3072093 (1963-01-01), Lanius
patent: 3104645 (1963-09-01), Harrison
patent: 3161174 (1964-12-01), Harrison
patent: 3179082 (1965-04-01), McClean
patent: 3329058 (1967-07-01), Cumming
Britts Ramon S.
Eaton Corporation
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