Patent ID: 6308940
Filing Date: 2001-10-30
Classification: E21B

Abstract:
A rotational and longitudinal shock absorber for use in a drill string comprising:a mandrel for connection to a drill string and providing external splines,a cylinder telescopically engaging said mandrel and having threads formed on the interior surface,seal means between the mandrel and the cylinder to form a chamber between an exterior surface of the mandrel and an interior surface of the cylinder,a torque cylinder formed with internal splines on the interior surface and external threads formed on the exterior, said interior splines engaging the splines on the mandrel and the exterior threads engaging the threads on the interior of the cylinder,resilient means carried on said mandrel, engaging a torque sleeve to resist the longitudinal movement of the torque sleeve in the interior of the cylinder and engaging said mandrel to resist the longitudinal movement of the mandrel within the cylinder.