Variable linkage assisted gripper

Details Variable linkage assisted gripper Variable linkage assisted gripper

2010-06-18

2011-11-22

Wright, Giovanna (Department: 3672)

Boring or penetrating the earth

With below-ground tool drive prime mover

With means to anchor prime movers support to bore wall

C175S098000, C166S212000, C166S217000

Reexamination Certificate

active

08061447

ABSTRACT:
A gripper mechanism for downhole tool is disclosed that includes a linkage mechanism and a flexible toe disposed over the linkage mechanism. In operation, an axial force generated by a power section of the gripper expands the linkage mechanism, which applies a radial expansion force to the flexible toe. For certain expansion diameters, the expansion force can be primarily transmitted to the toe from a roller-ramp interface expanding the linkage. For other expansion diameters, the expansion force can be primarily transmitted to the toe by expansion of the linkage in a three-bar linkage configuration. For other expansion diameters, the expansion force can be primarily transmitted to the toe by expansion of the linkage in a four-bar linkage configuration. Thus, the gripper can provide a desired expansion force over a large range of expansion diameters.

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