Patent ID: 8464791

Claim:
An arm system for logging a wellbore having a wellbore wall and at least one subterranean formation thereabout, the arm system positionable on a downhole tool deployable into the wellbore, the arm system comprising: a pad for measuring at least one downhole parameter; a first arm having an arm first end connected to a tool body of the downhole tool and an arm second end connected to a first end of the pad; a second arm having an arm first end connected to the tool body of the downhole tool and an arm second end connected to a second end of the pad; a sliding shuffle adapted to allow a portion of the arm system to translate relative to a longitudinal axis of the tool body; a first biasing member wherein the first biasing member and the sliding shuffle are for moving the pad between a closed position proximate the tool body and an engaged position proximate the wellbore wall; and a first swivel bearing and a second swivel bearing, each of the first swivel bearing and the second swivel bearing for pivotally connecting one of the first arm and the second arm to the pad, wherein the first swivel bearing and the second swivel bearing allows the pad to pivot tangentially relative to the first arm and the second arm and independent of the radial movement of the pad relevant to the wellbore wall.