F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/5, 116/66
F16B 31/02 (2006.01) E21D 21/02 (2006.01)
Patent
CA 1044053
ABSTRACT OF THE DISCLOSURE 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 's 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 the plate only upon the applicatic 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 with be axially spaced a known distance from the plate when the tension in the bolt is equal to the predeter- mined acceptable minimum tension. An elongated indicating member or flag, is pivotally mounted at one end thereof to the pivot member. The indicating member includes a surface or face which will engage the plate when the washer is flattened thereby maintaining the indicating member in a first position and which i will totally disengage the plate when the pivot member is axially spaced by the known distance from the plate to allow the indicating member to pivot under the influence of gravity to assume a second position. The indicating member will assume a position intermediate the first and second positions when the washer is intermediate the flattened condition and the condition whereat the pin is at the axial distance from the plate.
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