APPARATUS AND METHOD FOR ADJUSTING SPRING PRELOAD IN A DOWNHOLE TOOL

摘要

Apparatus and method for adjusting spring preloading in a downhole tool. In one embodiment, a mechanism includes a nut and a piston. The nut is configured to axially compress a spring in the downhole tool. The piston is coupled to the nut. Extension of the piston causes the nut to rotate and compress the spring. The nut is configured to maintain compression of the spring after the piston retracts.