Fastener tension indicator

F - Mech Eng,Light,Heat,Weapons – 16 – B

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F16B 31/02 (2006.01) G01L 5/24 (2006.01)

Patent

CA 2275872

A mechanical sensor for use with bolts (90), nuts (29), eye bolts and other fasteners is provided to sense fastener tension and to mechanically indicate that tension and changes therein by mechanically measuring deformation of the substrate (94) being clamped by the fastener relative to the distortion or lack thereof in the substrate immediately adjacent the deformed substrate. The differential substrate deformation produces measurable and often clearly visible movement of a portion of the sensor (24, 96, 101). Such movement may be interrogated through utilization of visual, optical, electro-optical means as desired.

On décrit un capteur mécanique destiné à être utilisé avec des boulons (90), des écrous (29), des boulons à oeil et d'autres dispositifs de fixation. Ce capteur mécanique est prévu pour détecter la tension de la fixation et pour indiquer mécaniquement cette tension et ses variations au moyen de la mesure de la déformation mécanique du substrat (94) serré par la fixation par raport à la distortion ou à la non distorsion du substrat au voisinage immédiat du substrat déformé. La déformation différentielle du substrat produit un mouvement mesurable et souvent nettement visible d'une partie du capteur (24, 96, 101). Ce mouvement peut être analysé à l'aide d'un dispositif de visualisation, d'optique ou d'électro-optique.

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