Load indicating fastener systems method and apparatus

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

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F16B 31/02 (2006.01) G01B 7/16 (2006.01) G01L 1/14 (2006.01) G01L 5/00 (2006.01) G01L 5/24 (2006.01)

Patent

CA 2300894

A fastener system (1) employs a portable sensing device (13) such as one or more reactance capacitors (15, 16) or an imago processor such as a camera (34) or a laser, which removably attaches adjacent to the fastener to detect and measure the change in a gap or specialized form of the bolt head or associated washer (26, 27) caused by the relative movement of portions of the fastener system (1) when it is under strain without contacting the sensed portions undergoing the significant relative movement.

Un système de fixation (1) emploie un dispositif portatif de détection (13), tel qu'un ou plusieurs condensateurs à réactance (15, 16), ou un processeur d'image, tel qu'une caméra (34) ou un laser, qui s'attache amovible adjacent à la fixation de façon à détecter et mesurer l'évolution concernant un intervalle ou une forme spécialisée de la tête de boulon ou de la rondelle associée (26, 27). Cette évolution est provoquée par le mouvement relatif de parties du système de fixation (1) lorsqu'il est soumis à une contrainte. La détection se fait sans entrer en contact avec les parties soumises à détection et subissant le mouvement relatif caractéristique.

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