Vacuum tool for installing valve spring retainer and keys

Abstract

A method and apparatus for reliably placing the spring retainer and keys on a valve stem, to lock the valve spring in place. The apparatus includes a linear actuator, having an extended position and a retracted position, and a connector for connecting the linear actuator to a carrying member, such as a robotic arm. A gripper is attached to the linear actuator, adapted to grip the spring retainer. The keys reside in a retainer-key kit, held therein by gravity, and are presented to the gripper in a predetermined position by a positioning device. As the linear actuator is extended from its retracted position to its extended position, the gripper engages the retainer-key kit. The retainer-key kit is then withdrawn from the positioning device by retracting the linear actuator. The gripper and retainer-key kit are then transported to the cylinder head so that the retainer-key kit is substantially positioned for application to the valve stem. The linear actuator is then extended to its extended position to apply the retainer onto the valve stem. At about the same time, vacuum is applied to the keys to draw the keys to a position above the retainer. After the retainer is applied to the valve stem, positive pressure is applied to the keys to move the keys back into the retainer, around the valve stem, as the gripper is withdrawn from the retainer by retracting the linear actuator.

Dependencies are inferred from the claim text.