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US 2010/0163251 A1Published application
Roller link toggle gripper and downhole tractor
AssigneeWWT International, Inc.
InventorsPhilip W. Mock, N. Bruce Moore, Duane Bloom
Life of this patent
Estimating the term…
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AssigneeWWT International, Inc.
InventorsPhilip W. Mock, N. Bruce Moore, Duane Bloom
Estimating the term…
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.
-61. (canceled)
A method of gripping a surrounding surface with an expandable assembly for use with a tractor for moving within a passage, said expandable assembly configured to be longitudinally movably engaged with an elongated shaft of said tractor, said expandable assembly comprising a first link, a second link, a wall engaging member, a roller and a ramp, the first and second links being pivotally attached relative to the elongated shaft at respective first ends and being connected with the wall engaging member at respective second ends, the roller and ramp being positioned such that the roller engages the ramp during at least a portion of a range of expansion of the expandable assembly, the method comprising the steps of:
Dependencies are inferred from the claim text.