Patent ID: 7546871
Filing Date: 2009-06-16
Classification: E21B

Abstract:
1. A downhole tool, comprising: a tool body having first and second support portions; at least one extendable assembly pivotally mounted between the first and second support portions, wherein the extendable assembly is reconfigurable between a retracted configuration and an extended configuration by relative movement of the support portions; and an outer sleeve assembly including a ratchet arrangement freely permitting relative movement of the support portions in one direction, and to selectively permit relative movement of the support portions in an opposite direction, the ratchet arrangement including a ratchet component defining a ratchet profile on an inner surface thereof for engaging a corresponding ratchet profile on an outer surface of a tool mandrel, the ratchet assembly further having a ratchet mandrel mounted on an outer surface of the tool mandrel, wherein the ratchet mandrel defines an aperture for receiving the ratchet component.