Machine tool fixture

摘要

A fixture for holding and presenting a work piece to a tool. The fixture includes a pair of pivotally mounted arms each of which has a jaw for closing on and engaging the work piece. The arms are disposed between a pair of opposed plates. Rollers are mounted on the plates adjacent the opposite ends thereof. A tapered rod extends between the rollers with a narrow part thereof engaging the rollers when the jaws are in their open position. A spring biases the tapered rod to dispose a wider portion of the rod in the space between the rollers to cause the jaws to close. A fluid actuated piston is attached to the tapered rod and is movable by the fluid alternately to assist or oppose the bias of the spring in moving the tapered rod.