Patent ID: 7635224
Filing Date: 2009-12-22
Classification: E21B,F16C

Abstract:
1. A method of adjusting backlash in a down hole bearing assembly, comprising the steps of: providing in side by side relation on an outer surface of an inner mandrel a circumferential first threaded seat adapted to accommodate a first nut which engages the first threaded seat and a circumferential second threaded seat adapted to accommodate a second nut which engages the second threaded seat; positioning at least one thrust bearing between a first stop projecting from an interior surface of an outer housing and a second stop projecting from the outer surface of the inner mandrel; threading the first nut onto the first threaded seat until further movement is resisted and the inner mandrel is placed in tension with the first stop and the second stop engaging the at least one thrust bearing; threading the second nut onto the second threaded seat until the second nut engages the first nut; and coupling the first nut and the second nut, such that the second nut resists any rotational movement of the first nut and the first nut resists any rotational movement of the second nut.