Roller link toggle gripper and downhole tractor

Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall

Reexamination Certificate

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Details

C175S098000, C166S212000, C166S217000

Reexamination Certificate

active

07954563

ABSTRACT:
An expandable gripper assembly may be configured for anchoring a tool in a passage. The expandable gripper assembly includes first, second, and third pivotally connected links that are coupled to a tool. The third link is adapted to engage an inner wall in the passage. An actuation mechanism causes the third link to move radially outward from the tool for engagement with the inner wall. The actuation mechanism may comprise a roller mechanism that pushes on an inner surface of the first link for causing the first link to pivot outward away from the body. As the first and second links pivot outward, the third link moves in a radial direction for engagement with an inner wall.

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