Constant force actuator

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/00 (2006.01) E21B 23/14 (2006.01) E21B 47/01 (2006.01) F16L 55/44 (2006.01)

Patent

CA 2582909

A radially expandable tool is provided that includes a tool body and a radially moveable member coupled to the tool body and in force receiving relation to a constant force actuator. The radially moveable member is movable by the constant force actuator from an closed position to a plurality of radially expanded open positions, which includes a fully open position. The constant force actuator includes an opening arm having a force transmission member; and a movement control guide in force reacting engagement with the force transmission member. The tool also includes a linear force generator; which applies a linear force to the constant force actuator, which the actuator transfers to a radial force perpendicular to the linear force. When the linear force is constant, the radial force transferred by the actuator is constant for each radial position of the radially moveable member from the closed position to the fully opened position due to the interaction of the force transmission member and the movement control guide.

Un outil expansible radialement comprend un corps et un élément a déplacement radial accouplé au corps, et en relation de réception de force par rapport à un actionneur a force constante. L'élément à déplacement radial est déplaçable par l'actionneur à force constante, d'une position fermée à de multitples positions ouvertes expansibles radialement, et qui comprend une position pleine ouverture. L'actionneur à force constante comprend un bras d'ouverture pourvu d'un élément de transmission de force, et un guide de commande de déplacement s'engageant par force de réaction avec l'élément de transmission de force. Cet outil comprend aussi un générateur de force linéaire qui applique cette force à un actionneur à force constante, que l'actionneur transfère à une force radiale perpendiculaire à la force linéaire. Lorsque la force linéaire est constante, la force radiale transférée par l'actionneur est constante pour chaque position radiale de l'élément à déplacement radial, de la position fermée à la position pleine ouverture, en raison de l'interaction de l'élément de transmission de force et du guide de commande de déplacement.

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