Self-centering clamp for down-hole tubulars

Details Self-centering clamp for down-hole tubulars Self-centering clamp for down-hole tubulars

E - Fixed Constructions

21

B

166/61, 255/14.2

E21B 19/06 (2006.01) E21B 19/15 (2006.01) E21B 19/16 (2006.01)

Patent

CA 1167024

SELF-CENTERING CLAMP FOR DOWN-HOLE TUBULARS ABSTRACT An automatically self-centering clamp for down-hole tubulars includes a frame which defines guides for two opposed clamping jaws. Each clamping jaw is pivotably attached to a rocker arm, and the two rocker arms are in turn pivotably attached to a tension member which extends therebetween. The tension member is mounted to the frame so as to be free to move in the direction of the clamping axis of the clamp as neces- sary to follow the movement of the jaws. A hydraulic cylinder is provided to pivot the rocker arms about the tension member, thereby positioning the jaws in the guides formed by the frame. A rotatable pivot plate is mounted to rotate within the frame, and link members are provided to link each of the rocker arms with a respective point on the pivot plate. The link members and the pivot plate act to maintain the rocker arms in symmetrical positions such that the jaws remain centered about a predetermined clamping axis for a wide range travel of the jaws.

383526

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