A mechanical overload protection device

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

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F16B 31/06 (2006.01) E21B 17/06 (2006.01) E21B 41/00 (2006.01) F16P 5/00 (2006.01) E21B 33/16 (2006.01) E21B 34/06 (2006.01) F16B 21/10 (2006.01)

Patent

CA 2201945

An overload proctection device of the type where components are fixed mutually by means of a safety member adapted to be cut or broken when the components are subjected to an overload, wherein the safety member is a thread spiral (2) adapted to be cut loose from a rod (1) or a sleeve (4) when the thread spiral (2) is subjected to an overload. In order to avoid an oblique position, a thread spiral (2) having two or more courses is used. By varying the material thickness and pitch of the thread spiral (2), a desired force profile can be predetermined.

On décrit un dispositif de protection contre les surcharges, dans lequel des composants sont fixés l'un à l'autre par un élément de sécurité conçu pour être coupé ou cassé quand ces composants sont soumis à une surcharge. Cet élément de sécurité est constitué d'un fil spirale (2) conçu pour être coupé et séparé d'une tige (1) ou d'un manchon (4) lorsqu'il est soumis à une surcharge. Pour éviter que ce fil spiralé (2) ne prenne une position oblique, on lui confère deux spires ou plus. On peut déterminer à l'avance un profil de résistance souhaité, en faisant varier l'épaisseur et le pas de spirale dudit fil spirale (2).

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