Fastening system for torque limited fasteners

B - Operations – Transporting – 25 – B

Patent

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B25B 23/14 (2006.01)

Patent

CA 2120421

Axially extending lobes extend radially from an internally threaded nut and form axial troughs that receive a respective axial cone mounted in the socket of a driver, the cones being rotatably driven against the lobes to apply a threading torque to the nut. At a predetermined torque, an axial outer radial end portion of the material forming the lobe is plastically deformed, but not sheared off, thereby allowing the socket to rotate and the cones to advance against the next respective lobe. The deformed lobe indicates to the user that the nut was properly torqued and the deformed material does not shear off thereby indicating that the nut had not been tampered with. To permit relaxation, a second torquing could be done at a later time.

Des lobes qui s'étendent axialement se prolongent radialement à partir d'un écrou à filetage interne et constituent des creux dans le sens axial qui reçoivent un cône axial correspondant monté dans la douille d'un tourne-écrou. Ces cônes sont entraînés par rotation contre les lobes afin d'appliquer un couple de serrage sur l'écrou. A un couple prédéterminé, une partie de l'extrémité radiale extérieure dans le sens axial du matériau constituant le lobe subit une déformation plastique, mais n'est pas cisaillée, ce qui permet à la douille de tourner et aux cônes d'avancer vers le prochain lobe correspondant. Le lobe déformé indique à l'utilisateur que l'écrou a été serré au bon couple, et le matériau déformé ne se cisaille pas, ce qui prouve que l'écrou n'a pas été mal employé. Pour permettre la relaxation, un deuxième serrage pourrait être effectué ultérieurement.

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