Safety switching system for clamping devices for pipes

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/07 (2006.01)

Patent

CA 2293294

The invention relates to a safety switching system for a clamping device used for holding and/or lowering and raising a line of pipes lining a borehole. Said safety switching system is mounted inside the clamping device, where it is protected from external mechanical influences. To this end, a shift cam for a safety shift valve is fastened to the clamping wedge support of the clamping device. This valve is mounted on the base of the clamping device, and cooperates with the shift cam when the clamping wedges adopt their prescribed clamping position on the line of pipes.

L'invention a pour but de fournir, pour un appareil de fixation de tubes destiné à maintenir et/ou à abaisser et à soulever une ligne de tubes (13) servant au revêtement d'un trou de sonde, un système de commutation de sécurité qui soit monté protégé à l'intérieur de l'appareil de fixation sans être exposé à aucune influence mécanique extérieure. A cet effet, l'invention est caractérisée en ce que sur le support (14a, 14b) de clavette de serrage de l'appareil de fixation est fixée une came de contact (18) pour une soupape de commutation de sécurité (1, 2) agencée sur le corps de base (10) et qui est en liaison coopérante avec ladite came de contact, lorsque la clavette de serrage (12a, 12b) prend sa position de serrage prescrite sur la ligne de tubes.

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