Patent ID: 7163092

Claim:
A linkage comprising: a first rod having a principal axis; a second rod having a principal axis aligned on the principal axis of the first rod; a vibration filtering mass; the first rod being rigidly linked to the vibration filtering mass with the second rod being relatively loosely coupled to the vibration filtering mass, the combination of first rod and vibration filtering mass having a substantially greater mass than the second rod so that the first rod and vibration filtering mass move together relative to the second rod when the linkage is unloaded and vibration is applied to the second rod; and first and second compressible bearings mounted on the second rod, the second rod being positioned with respect to the vibration filtering mass such that the first and second compressible bearings impinge against the vibration filtering mass in first and second opposed directions to provide the loose coupling, which are coaxial with the principal axis of the second rod, the first and second compressible bearings limiting play of the second rod with respect to vibration filtering mass parallel to the principal axis of the second rod.