Patent ID: 7600452
Filing Date: 2009-10-13
Classification: B25B,F01L

Abstract:
1. A tool for adjusting the position of a threaded tappet screw relative to a spring biased valve, the tappet screw being selectively locked in position by engagement of a jam nut on the screw, wherein the tool comprises: a wrench portion having a socket adapted to engage the jam nut, a handle for turning the socket, and a clutch mechanism to prevent further turning of the socket by the handle when the socket encounters a predetermined torque level; a bit extending through the socket, the bit engageable with the tappet screw for rotating the tappet screw towards or away from the valve; a powered rotational driver attached to the bit to turn the bit for moving the screw toward and away from the valve, the driver stopping rotation when it encounters a predetermined torque level; and, a gripper mechanism including a parallel gripper actuator having a pair of gripper fingers, wherein said gripper mechanism is selectively activated and deactivated so as to either grip said bit, and thereby prevent rotation of said bit, or to release said bit and thereby permit rotation of said bit, wherein said gripper mechanism is adapted to prevent rotation of said bit at any rotational position of said bit, and wherein said gripper mechanism is deactivated to release said bit upon power-operation of said powered rotational driver and activated to grip said bit when said powered rotational driver is stopped.