Abstract: A dual action sander includes a housing, a motor shaft balancer, a balancer shaft, an engaging member and a control rod unit. The motor shaft balancer is disposed in the housing, and is rotatable about a first axis. The control rod unit is movable along the first axis between a locked position, where the balancer shaft is not permitted to rotate about a second axis that is parallel to and spaced apart from the first axis, and an unlocked position, where the balancer shaft is permitted to rotate about the second axis. The engaging member is mounted to one of the balancer shaft and the control rod unit, and is engaged with the other one of the balancer shaft and the control rod unit when the control rod unit is in the locked position.

Abstract: A pneumatic tool driving assembly comprises: a valve housing defining first and second chambers and a valve opening; a valve mechanism including a valve actuator that extends into the valve housing, and a valve member that is disposed for closing the valve opening and that is actuated by the valve actuator to uncover the valve opening; and a trigger mechanism pivoted to an exterior of the valve housing so as to be pressible relative to the valve housing. The trigger mechanism includes a detachable wrench that is spaced apart from the valve housing, and a pivot joint that is pivoted to the valve housing and that brings the wrench to pivot relative to the valve housing.

Abstract: A drill grinder includes a feed means in which a sleeve, a first cam, a second cam, and a second casing are engaged in sequence, the sleeve having a disk which has two diametrically opposite formed plane portions and two first wheels rotatably engaged thereto for rolling on the first cam which is equipped with two second wheels for rolling on the second cam and the first cam can only longitudinally be moved in the first casing, the second cam having a ratchet wheel disposed thereto, both of the second cam and the ratchet wheel are mounted to a tubular portion of the second casing in which a ring-type gear engaged for a belt connected, the first casing pivotally engaged to a base by a certain angle corresponding to an axis of the first casing, a start means having a fork to actuate the ratchet wheel and an inspecting means having a probe to contact the disk and a grinding wheel means having a grinding wheel which has a longitudinal axis intersecting the axis of the first casing at an angle, such that the sleev