Patent ID: 7252163

Claim:
A downhole tool comprising: a) a body having a longitudinal axis and a body through-bore, a slot communicating the outside of the body with the body through-bore; b) a sleeve actuator mandrel having a sleeve actuator mandrel through-bore and being selectively axially slidable in the body through-bore; c) a flange on the sleeve actuator mandrel extending into said slot and having one of ribs and channels formed on its sides and inclined at an acute angle to the longitudinal axis; d) a hollow bar slidable with a radial component in the slot, the other of channels and ribs being formed on the bar and corresponding with, and engaged in, said one of said ribs and channels of the flange, and e) seals between said sleeve actuator mandrel and body beyond both ends of said slot, and a seal around the bar in the slot, which seals define between them a chamber enclosing lubricating oil.