A pneumatic device includes a casing unit defining a first chamber, a receiving space and a front space; a cylinder movably received in the receiving space, defining a second chamber and a releasing room, and having an air passage unit and an annular groove; and a hollow piston rod in sliding engagement with the cylinder, and having an inlet channel, a communicating room and an air hole unit. The cylinder and the piston rod are movable to change between a pneumatic state, where the air hole unit is communicated with the inlet channel, the annular groove, the communicating room and the second chamber, and an air discharging state, where the air passage unit is communicated with the second chamber, the receiving space and the releasing room.

A pneumatic machine tool comprises a handle with one end being a first pivot connecting end, and a tool head. The handle comprises a main flow channel extending to the first pivot connecting end, and a switch assembly provided in the main flow channel. The tool head comprises a main body, a tool driving assembly disposed in the main body, and two pivot connecting arms formed on the main body and disposed side by side. The two pivot connecting arms are served as a second pivot connecting. The main body is formed with a chamber provided for disposing the tool driving assembly, and at least one secondary flow channel communicating with the chamber and extending to the two pivot connecting arms. The pivot shaft comprises a transfer flow channel and two transfer ports communicating with the channel.

A handheld power tool with low speed includes a housing, a middle sleeve shell and a front sleeve shell connected by threads on the exterior, and a pneumatic motor, a planet gear mechanism, a bearing, a cushion member and a fastened base in the interior. The pneumatic motor connects the planet gear mechanism through a driving shaft. The planet gear mechanism connects a grinding member located in the fastened base through a driven shaft and a flexible shaft. An outer flange portion is disposed around the fastened base. An inner flange portion is disposed on the front sleeve shell in order to press the outer flange portion while the middle sleeve shell is locked by the front sleeve shell so that the fastened base, the cushion member, the bearing, the planet gear mechanism and the pneumatic motor are fixed in a row.

A monopodic sander is provided for an operator to sand a surface. The monopodic sander comprises a rotary sanding head for contacting the surface and an extendable actuator rod having one end pivotally coupled to the rotary sanding head. The monopodic sander further comprises a controller handle operatively coupled to the one end of the extendable actuator rod to allow the operator to select a pressure applied by the rotary sanding head against the surface.

A high torque dual speed turbine rotor for a lightweight hand held tool for grinding and polishing or for use with a spindle mounted pneumatic machine. The high torque dual speed turbine rotor includes a two-piece shaft with flow control screw disposed within the shaft. The shaft includes a first set of hollow openings, at a first position from one end of the shaft, in fluid communications with a first annular chamber of a rotor. There is also a second set of hollow opening, at a second position from the one end of the shaft, in fluid communications with a second annular chamber of the rotor. The flow control screw moves inside a threaded axial bore of the shaft from an open position inside the axial bore to the closed position corresponding to the second set of hollow openings.

A hand-held turbine cleaning tool includes front and rear housings coupled to each other, an outlet at one end of the tool, and a top of the tool at an opposed end. The outlet is directed in a first direction away from the top. An inlet is disposed between the outlet and the top and is also directed in the first direction. A diverter valve at the inlet is moveable between on and off positions. The on position directs water flowing into the inlet from the inlet, up to the top in a second direction opposite the first direction, and then down to the outlet in the first direction. A turbine at the top has a turbine shaft that extends outside the tool. An abrasive member is connected to the turbine shaft and is configured to rotate when water flows from the inlet to the outlet.

A compressed air-driven tool having an electromagnetically operated control element (27) for controlling a pneumatic control circuit in order to maintain a load-independent torque at a constant rotational speed. The tool includes a principal valve (5), which arranged in a drive housing (1) in a manner displaceable by the supplied compressed air against the force of a helical spring (13), and a generator (43), which is mounted on the shaft (49) of a turbine wheel (51). The rotational speed of the shaft (49) is measured with a speed sensor (75) and the supply of compressed air to the principal valve (5) is controlled in the event of a drop in rotational speed as a consequence of a load.

A pool cleaning tool includes a front housing and a rear housing coupled together, an intake, an outlet, a turbine disposed within the front and rear housings, and a three-way diverter valve proximate the intake. The tool includes an abrasive member, rigidly coupled to the turbine, mounted outside the front and rear housings for rotation with the turbine. The three-way diverter valve has an on position in which water drawn into the intake is communicated into the tool, up to the turbine, and then out the outlet, thereby imparting rotation to the turbine and to the abrasive member.

A handheld multifunction power tool includes a driveshaft, a hub assembly, and a stem. The hub assembly includes an outer hub and an inner hub that is rotatably coupled with the inner hub and rotatable with respect to the outer hub. Rotation of the inner hub relative to the outer hub facilitates selection from among a rotary mode and a random orbital mode.

An improved structure of water mill has a body provided with a handle part, a body part, a working head base and a pressing control switch. The handle part is provided with an intake passage, an exhaust passage, and a water inlet reversing passage. By triggering the pressing control switch, a high-pressure gas is guided into the intake passage and the body to drive the water grinder. A water pump gas outlet is provided with a double sleeve tube connected to a sealed water storage tank. The discharged high-pressure gas is guided into the sealed water storage tank through the outer tube of the double sleeve tube, so that the stored water is pressed back to the double sleeve tube and is simultaneously guided into the water inlet reversing passage. Finally, the water is guided out to the working head base, with simultaneous grinding and water cooling.