Abstract: A speed adjusting apparatus for a pneumatically driven power tool includes a control valve that is adapted to be mounted rotatably within an intake passageway in an outer housing. A connecting rod extends through a pivot hole in a rear cover, and interconnects the valve and a rotary member that is disposed rotatably on the rear cover in such a manner that the valve rotates synchronously with the rotary member. The rotary member can be rotated to align an intake outlet passageway in the valve with a selected one of a forward passageway and a reverse passageway in the rear cover. When the intake outlet passageway is aligned with the forward passageway, a tool head rotates in a direction. When the intake outlet passageway is aligned with the reverse passageway, the tool head rotates in the opposite direction.

Abstract: A cage device includes front and rear end plates respectively provided with front and rear major walls, and spaced apart from each other in a longitudinal direction. The rear major wall is in a splined connection with and driven by a drive output shaft of an air motor, and is formed with a pair of first pin holes which are diametrically spaced apart from each other. The front major wall is formed with an inserting hole for sleeving rotatably on a power output shaft, and a pair of second pin holes which are diametrically spaced apart from each other relative to the inserting hole. Opposite tilt and limit pins are provided with two first secured ends and two second secured ends respectively to be inserted into and in tight connection with, in the longitudinal direction, the first and second pin holes so as to define a space therein.

Abstract: A pneumatically driven power tool includes a handle with air inlet and outlet passageways therein, and a transverse mounting housing. The mounting housing has a transverse circumferential portion with a rear abutment wall, a rear annular shoulder portion, an intermediate cylindrical wall segment, and a front annular shoulder portion. A rear bearing member and a rear mounting plate are inserted into the circumferential portion to abut respectively against the rear abutment wall and the rear annular shoulder portion, and are secured by a lockpin. A front mounting plate and a front bearing member are inserted into the circumferential portion to abut against the front annular shoulder portion and the front mounting plate, and are secured by another lockpin. A motor cylinder mates with the circumferential portion. A driven shaft is disposed in and is rotatable relative to the cylinder, and is journalled on the front and rear bearing members.

Abstract: A pneumatic tool includes a tool housing which is provide with a pneumatic driving unit. The handle of the tool housing has a horizontal blind bore formed therein. An air flow regulating ring for regulating air flow into the interior of the tool housing to activate the driving unit, an air direction control unit for controlling the direction of air flow to the driving unit so as to control the rotation of the driving unit, and a control rod for controlling air flow into the tool housing, are disposed axially inside the blind bore.