Abstract: A pneumatic tool includes a casing, a cylinder unit, a valve knob and a pneumatic sealing device. The casing has a main portion that has an inner surface defining a receiving space therein, and an outer surface opposite to the inner surface. The cylinder unit is mounted in the receiving space. The valve knob is disposed in the receiving space and is rotatably connected to the cylinder unit. The pneumatic sealing device includes a ring member that is ring-shaped and rigid, that surrounds and is connected to the valve knob, and that is clamped between the inner surface of the casing and the cylinder unit for keeping a distance between the casing and the cylinder unit constant.

Abstract: A torque-adjustable pneumatic tool comprises a body, a trigger assembly, and a torque-adjusting module. The body has an outlet tunnel. The trigger assembly is mounted to the body. The torque-adjusting module is mounted to the body, communicates with the outlet tunnel, and has a silencer, an adjusting bolt, and a piston lid. The silencer has a recess and an exhaust portion communicating with the recess. The exhaust portion has a threaded hole and at least one exhaust hole that are separately disposed through the exhaust portion. The adjusting bolt is movably mounted to the threaded hole of the silencer from a side away from the body, and engages with the silencer through threads. The piston lid is fixed to the adjusting bolt and is able to enter the recess.

Abstract: A reversing mechanism for a pneumatically or hydraulically powered tool having a rotor adapted to selectively rotate in either one of first and second rotational directions. The reversing mechanism allows a user to actuate a button that rotates a valve to direct air flow through the tool. By pressing the button, the button will move a base laterally, and in doing so, rotates the valve. Rotating the valve distributes fluid to cause the rotor to rotate in a selected rotational direction.

Abstract: A pneumatic generating device has a valve sleeve, a valve core, a piston pin, and a guiding assembly. The valve sleeve has a sleeve chamber and an input end. The valve core is mounted rotatably in the valve sleeve and has an axial hole and an annular groove. The annular groove is defined around the valve core. The piston pin is mounted moveably in the axial hole and has an end extending out of the input end of the valve sleeve and combined with a sealing cap. The guiding assembly is combined rotatably with the valve core and has a signal member and a guiding tube. The signal member is held in the annular groove in the valve core and has a passage communicating with the sleeve chamber. The guiding tube is connected with signal member and communicates with the passage in the signal member.

Abstract: A pneumatic tool includes a main body, a power mechanism, a slave valve, a master control lever and a connecting element. The main body includes a front housing and a back housing. The front housing includes a first accommodating space and is connected with the back housing. The power mechanism is disposed in the first accommodating space. The slave valve is coaxially connected with the power mechanism. The master control lever is disposed at the back housing and includes a first protruding portion and a second protruding portion. The first protruding portion protrudes from a side of the back housing. The second protruding portion opposes to the first protruding portion and protrudes from another side of the back housing. The connecting element is disposed between the master control lever and the slave valve, whereby the slave valve is rotated by a linear motion of the master control lever.

Abstract: A power tool includes a fluidically-driven prime mover controlled by a multi-stage, throttle-actuated dual-ported mechanism disposed in the power tool. When the first stage is actuated, pressurized fluid is admitted into the prime mover via a first delivery path in fluid communication with one of the ports. When the second stage is actuated, pressurized fluid is also admitted into the prime mover via a second delivery path in fluid communication with the other port to augment the volume of pressurized fluid admitted into the prime mover via the first delivery path. In one embodiment of the present invention, the prime mover includes a dual-chamber air motor. Upon detecting an imminent stall condition, an operator can axially advance a trigger stem to admit a boost of pressurized air into the motor via the second delivery path.

Abstract: A double-valve mechanism and a pneumatic tool including the same are provided. The double-valve mechanism is mounted in a main body of the pneumatic tool. The main body has an exhausting passage and an outlet passage communicating therewith, and an entrance passage and an inlet passage communicating therewith. The double-valve mechanism is operable from outside of the main body to move relative to the main body so as to selectively seal an entry of the inlet passage and an exit of the outlet passage. Whereby, the stop of the tool is effectively ensured after the double-valve mechanism is closed, no gas leakage will occurs, the waste of pressurized air energy and defects of the tool will be avoided, and the rotation of the rotor can be quickly stopped.

Abstract: A valve arrangement includes an inlet conduit defining an inlet passage adapted for communication with a supply of pressurized motive fluid, a first planar surface spaced radially from the inlet conduit, first and second supply passages communicating through the first planar surface, and a rotary valve. The rotary valve includes a second planar surface abutting against the first planar surface and a valve passage communicating through the second planar surface. The rotary valve is rotatable to place the inlet passage in communication with a selected one of the first and second supply passages through the valve passage, and is adapted to conduct the pressurized motive fluid from the inlet passage to the selected one of the first and second supply passages.

Abstract: A power tool including a power tool body, a rotatable driven member operable for releasably gripping a working element and having a front end and a rear end, the driven member extending from the rear end, located proximally and connected to the power tool body, and terminating at the front end. The power tool has a drive mode in which rotation of the driven member drives the working element and an adjustment mode in which rotation of the driven member causes the driven member to either grip the working element or release the working element or both. The power tool also includes a guard extending over the driven member from the power tool body and terminating adjacent to the front end of the driven member, wherein at least in the power tool drive mode the front end of driven member does not extend beyond the guard.

Abstract: An apparatus is disclosed that includes a fluid inlet in fluid communication with a valve assembly, the valve assembly structured to selectively permit the flow of a motive fluid from the fluid inlet to a fluid driven motor, and wherein the valve assembly further includes a first plunger and a second plunger, one of the first plunger and the second plunger including a plurality of axially incorporated fluid channels, wherein the plunger including a plurality of axially incorporated fluid channels is structured to be selectively driven by an actuator such that as the plunger including a plurality of axially incorporated fluid channels is axially displaced away from a first position the number of axially incorporated fluid channels in fluid communication with the fluid inlet and the fluid driven motor increases.

Abstract: A power tool with a reversible motor and a switch arrangement for controlling operation of the motor. The switch arrangement includes a direction switch, an actuator and an indicator. The direction switch is configured to control a rotational direction of the motor. The actuator is configured to receive a manual input from an operator indicative of a desired operational state of the motor. The indicator includes direction indicia indicative corresponding to operational states of the motor. The direction indicia is positioned at a location that is spaced apart from the actuator.

Abstract: Apneumatic driven wrench comprises: a housing defining a middle channel; a cylinder defining two fluid passages; a rotor; a first valve; a second valve driven by a valve-switching member for controlling fluid communication between the middle channel and a selected one of the fluid passages; a valve-triggering unit for driving the first valve; and a locking member driven by the valve-triggering unit to move between releasing and locking positions. The locking member engages one of the valve-switching member and the second valve when at the locking position. The locking member is disengaged from the one of the valve-switching member and the second valve when at the releasing position.

Abstract: A bypass assembly varies the hydraulic motor revolutions per minute (rpm) of a hydraulically driven tool, such as a wrench or a drill. This controls the torque of a driven mechanical mechanism, such as used on an impact wrench. The tool includes a body having a supply channel capable of being connected a source of fluid, a bypass spool channel in fluid communication with the supply channel, and a return channel in fluid communication with the bypass spool channel via a port and in fluid communication with the source. A bypass spool seats in the bypass spool channel. The bypass spool can be rotated to three discrete positions within the bypass spool channel to provide three different settings of revolutions per minute (rpm) of the gear motor.

Abstract: A forward/reverse rotation device of a pneumatic tool comprising a clutch switch that can be pressed towards the inside of a switching valve to separate a steering switch from its connection with a positioning element, and the steering switch is turned from a side of a handle of the pneumatic tool to the other opposite side, and the clutch switch is bounced to resume its original position by the support of an elastic element, so as to connect the steering switch with the positioning element again. A sleeve portion of the steering switch is coaxially and pivotally installed at a center rod of the clutch switch, and the steering switch is turned between both sides of the handle and maintained to be pivotally turned on the center rod.

Abstract: A compact one touch pneumatic wrench includes a cylinder having an improved air passage to achieve one touch function and a housing mad of engineering plastic material. Compared to a conventional pneumatic wrench which needs one hand to hold the handle and the other hand to operate the clockwise/counterclockwise rotation of the motor, the present invention improves the air passage of the cylinder to provide a simple and convenient operation with only one hand, providing a convenient operation and enhancing the work efficiency.

Abstract: A powerhead for a hand held power tool includes a powerhead assembly, the powerhead assembly being operably couplable to a hand held motive source, the powerhead assembly having a rotatable implement, the implement being selectively rotated by the motive source when the motive source is operably coupled to the powerhead assembly, the implement further being rotatable about an implement axis, the implement axis being disposed transverse to a powerhead assembly longitudinal axis, the implement axis intersecting the powerhead assembly longitudinal axis. A hand held power tool and a powerhead of forming a powerhead for a hand held power tool are further included.

Abstract: A rotation speed control device for air tools and the method thereof are disclosed. A shell base is disposed with a forward air inlet and a reverse air inlet. A back cover is connected to one side of the shell base. The back cover has a forward flow path in communications with the forward air inlet and a reverse flow path in communications with the reverse air inlet. The forward flow path has a rotation space whose one side has a pressure release hole in communications with the ambient space. A rotation speed control element having a stopping part that can close the pressure release hole is disposed in the rotation speed. The rotation speed control element rotates to control the aperture size of the pressure release hole, thereby adjusting the airflow entering the forward flow path.

Abstract: The pneumatic tool having pendulum-like direction switching mechanism of the present invention includes a pneumatic motor and a control valve. The control valve is utilized for receiving pressurized air and for alternatively leading air into the pneumatic motor to drive and control the pneumatic motor. The present invention further includes a switching device and a coupling mechanism. By connection of the coupling mechanism, the switching device is able to control motion of the valve. In addition, the switching device slides along an arc-shaped route. Thus, the switching device approaches the pneumatic tool without protruding excessively. Therefore, unexpected collision is lessened and lifetime is prolonged.

Abstract: A structure for adjusting positive or reverse rotation of a pneumatic tool is proposed to be mainly composed of an outer casing, a driving device and a knob. An air controlling part arranged on the outer casing leads air to be transmitted from an air incoming chamber in the outer casing to the driving device through a reducing air intake. A bearing seat is arranged in the driving device. The knob arranged on the outer casing extends with an annular wall for separating air incoming from air discharging. An armature slot formed at the annular wall connects to and communicates with the bearing seat. The annular wall has a protrusion formed with a first air intake allowed to communicate with a positive or reverse air intake. Thereby, the first air intake can adjusted to be aligned with the positive or reverse air intake by rotation of the knob.

Abstract: A compliant shifting mechanism can change the operation of a power tool between first and second operating conditions. The shifting mechanism can provide two distinct forces on a gear set during movement of the gear set between the two operating conditions. The shifting mechanism can provide a user with a tactile sensation of the completion of the transition between the two operating conditions without the gear set completing the full transition. A shifting mechanism can automatically complete the change between operating conditions, regardless of an alignment between the gear set and another component. The two distinct forces can be a torsional resistance force and a bending resistance force.

Abstract: An improved structure of a pneumatic impact wrench includes a main body, a plastic casing provided for fixing a motor casing and a motor module, the motor module having a cylinder for installing a rotor, the rotor being extended from an axle and supported by a bearing, the motor casing having an external case with a hardness greater than that of the plastic casing, and the external case being hollow and penetrating both ends to form a chamber for accommodating and installing a cylinder, and the external case having a stop ring protruded from an internal wall of the chamber and provided for blocking the cylinder, and an external case cover installed at a rear end of the external case for coupling and covering the external case cover.

Abstract: A pneumatic motor of the present invention is provided for pneumatic tool. The pneumatic motor includes a cylinder, a rotor and a controlling valve. The rotor is rotatably disposed in the cylinder. Two gas passages and an exhaust hole are defined by the cylinder. The exhaust hole extends along a circular direction of the rotor. The exhaust hole has a first end and a second end. The exhaust hole is partially covered by the controlling valve. The exhaust hole has a remained opened portion which is adapted for air to flow therethrough. The controlling valve is adjustable so as to change position of the opened portion. As such, a power stroke in the cylinder is able to be adjusted, so that the power generated by the pneumatic motor is changeable.

Abstract: A portable pneumatic power wrench has a housing with a handle, a motor, a pressure air inlet passage, and an outlet passage for ducting exhaust air from the motor out of the housing. An outlet unit is connected to the outlet passage and has a first outlet opening section forming a main exhaust air flow path, a second outlet opening section forming an additional exhaust air flow path, and a manually operable valve arranged to control the additional exhaust air flow path by opening or closing the second outlet opening section. The total outlet flow area of the main exhaust air flow path and the additional exhaust air flow path gives an augmented torque output of the power wrench.

Abstract: A control mechanism for a rotary hand tool of the type having a generally cylindrical housing in which a drive motor is located, the housing having a nose portion from which a motor output shaft extends and a grip portion, the mechanism including an electrical control circuit that controls the application of power to and the operation of the motor, and a light touch switch having at least a first position or state and a second position or state coupled to the electrical control circuit for selectively enabling or disabling the control circuit to turn the motor on and off. The switch is disposed on the nose portion of the rotary hand tool such that an operator can actuate the switch substantially without altering the operator's grip on the tool.

Abstract: A pneumatic impact wrench includes a handle assembly graspable by a user, a work attachment connected to the handle assembly, an inlet permitting air flow to drive the impact wrench, an outlet permitting air flow out of the impact wrench, a motor assembly positioned between the inlet and the outlet includes a rotor driven by the air flow between the inlet and the outlet. The motor assembly defines a longitudinal motor axis about which the rotor rotates. An output drive is connected to the motor assembly to selectively rotate in response to rotation of the rotor, the output drive defines a longitudinal output axis about which the output drive rotates, the longitudinal output axis is substantially perpendicular to the longitudinal motor axis, and an impact mechanism is positioned between the motor assembly and the output drive to selectively drive the output drive in response to rotation of the rotor.

Abstract: A hand tool that is preferably hydraulically actuable includes a working head and a body unit that remains in place with respect to the head, drive elements for driving the working head being provided in the body unit, for example a hydraulic pump and a hydraulic supply, a switching movement also allowing a powered movement of one or more working parts of the working head to be triggered and the working head being swivelably connected to the body unit in a rotary connection region. In order to configure and develop a hand tool so that safe working is assured by virtue of unambiguous and clear handling, by swivelling of the body unit relative to the working head about an axis of rotation provided in the region of the rotary connection of the working head to the body unit, switching over can be carried out with regard to the powered movement of the working part.

Abstract: The improved airflow control structure for pneumatic tools has an air inlet to receive external air, a cylinder located in a pneumatic tool and an air intake passage located between them. A valve bushing is provided to connect to the air intake passage and respectively connect a first air intake flow path and a second air intake flow path. The valve bushing holds a control bar which can alter the air intake flow path of the pneumatic tool to control the rotation of pneumatic tool in a positive direction or a reverse direction. As the valve bushing and the cylinder are integrally formed in one piece, the pneumatic tool can be adopted in a plastic housing. Through the control bar users can operate the pneumatic tool single-handed as convenient as to start, stop or regulate the pneumatic tool in positive or reverse rotations while using the same hand to hold it.

Abstract: A device for controlled operation of a surgical or dental drive unit driven by a compressed fluid source p available in the operating room and comprising A) a control valve attachable to the drive unit for controlling a flow rate of a compressed fluid flowing from a compressed fluid source p to a drive unit; B) a first control means by means of which the control valve is operable; and C) a second control means by means of which a flow rate of compressed fluid may be controlled. The device further comprises D) a control switch which is attached to the control valve and allowing to select between at least three positions (A;B;C): in position A the control valve is locked and closed; in position B the control valve is unlocked and a flow rate of the compressed fluid is controllable by means of the first control means; and in position C the control valve is unlocked and open permitting the control of a flow rate by means of the second control means.

Abstract: A pen-type pneumatic tool having a manual airflow control knob includes a manual airflow control knob which enables users to easily control airflow amount without using any tool.

Abstract: A compact pneumatic hand tool composed of a body, a cylinder assembly, a sealing pad, a striking assembly, a front cap, a control knob, a ventilation cap and threaded bolts. A first bearing is mounted around a rear end of the striking assembly and an outer rim of the first bearing is securely received in a central hole of the cylinder assembly. A second bearing is mounted on a central shaft of the rotor in the cylinder assembly. The control knob is mounted on the cylinder assembly. A front end of the central shaft of the striking assembly extends out of a front cap and the body is connected to the front cap via threaded bolts so that the striking assembly and the cylinder assembly are sealingly enclosed between the front cap and the body to accomplish the compact and light-weight requirements.

Abstract: A compact pneumatic hand tool composed of a body, a cylinder assembly, a sealing pad, a striking assembly, a front cap, a control knob, a ventilation cap and threaded bolts. A first bearing is mounted around a rear end of the striking assembly and an outer rim of the first bearing is securely received in a central hole of the cylinder assembly. A second bearing is mounted on a central shaft of the rotor in the cylinder assembly. The control knob is mounted on the cylinder assembly. A front end of the central shaft of the striking assembly extends out of a front cap and the body is connected to the front cap via threaded bolts so that the striking assembly and the cylinder assembly are sealingly enclosed between the front cap and the body to accomplish the compact and light-weight requirements.

Abstract: A valve apparatus for an air tool which has a valve rotatably disposed in a cylinder portion of a body of the air tool in which an air motor is accommodated; and a lever fixed to the valve and slidably received within a slit-shaped opening formed in the cylinder portion. The valve includes a first disc portion having an air inlet, a lever-fixing portion having an air passage which communicates with the air inlet, and a second disc portion having an air outlet which communicates with the air passage. The lever-fixing portion is narrower than the first and second disc portions. The lever has a knob portion slidable within the opening and a generally U-shaped engagement portion fixed to the lever-fixing portion so that two legs of the engagement portion sandwich the lever-fixing portion from diametrically opposite sides.

Abstract: An air drill includes a body having a grip portion having an air supply passage and an air exhaust passage formed therein, a trigger portion formed above the grip portion and supporting a trigger, and a cylinder portion formed above the trigger portion and accommodating an air motor. A reverse valve is disposed within the cylinder portion in order to switch the direction of rotation of the air motor between forward and reverse directions. Two reverse levers are disposed in an upper portion of the reverse valve and slidably accommodated in two slit-shaped openings, respectively, which are formed in a grip-portion-side end of the cylinder portion.

Abstract: The present invention relates to a brake band for use with a centrifugal clutch. The brake band is formed in a curved strip shape to be disposed along the outer peripheral surface of a clutch drum of the centrifugal clutch, and is adapted to be tightened around or released from the outer peripheral surface in response to the movement of at least one end of the brake band. The brake band comprises a plurality of linings provided on the inner surface thereof to be opposed the outer peripheral surface of the clutch drum. The linings are located spaced apart from each other along the longitudinal direction of the brake band.

Abstract: A hydraulic motor, especially for driving of rotating tools, consisting of a chamber (2) provided with an inlet (10) for supplying fluid, and with at least one outlet hole (6), before which, on a holding device, a rolling rotor (7) is seated, the rolling rotor (7) is formed by a body of rotational shape. That the chamber (2) is at least in its internal surface of rotational shape and of a tapering diameter. The chamber (2) is on its side of the maximum diameter open, and on the side of its minimum diameter limited by means of a wall (3), in the middle of which a hole (4) is provided, through which a shaft (5) passes with a clearance, the shaft (5) carrying the rolling rotor (7). The shaft (5) is inside the chamber (2) provided with a recess (8), the diameter of which is larger than the diameter of the hole (4) in the wall (3).

Abstract: A turning device for compressed air tools. which is operated by a compressed fluid, is provided with a housing and with a rotor, which is rotatably arranged in a front housing part and into whose turbine element the fluid, which is under pressure, can flow, has a braking arrangement and a switch for the compressed fluid. The switch which is operatively connected with the braking arrangement and is arranged on a rear housing part in line with a compressed fluid supply conduit. Such a turning device requires fewer components and can be stopped in a simpler and faster way by a fluid switch, in the form of a sliding switch, which encloses the rear housing part in the area of the supply conduit and is provided with axially oriented control pins, which are connected, fixed against relative displacement, with a brake disk of the braking arrangement.

Abstract: A portable trimmer in which the power generated by an internal combustion engine is transmitted to a cutter via a centrifugal clutch and the output power of the internal combustion engine is controlled by operating a manual throttle lever, thereby adjusting the throttle opening of a throttle valve via a throttle wire. The portable trimmer includes a friction member arranged to face the clutch drum of the centrifugal clutch, a moving member which is connected to the friction member and moves the friction member between a braking position where the friction member is pressed against the clutch drum and a non-braking position where the friction member is kept away from the clutch drum so as to release the braking, a manual release device for moving the moving member from the braking position to the non-braking position, and a release restricting device for controlling the behavior of the manual release device.

Abstract: The invention is a pneumatic tool with a reverse valve having an overdrive. In particular, the pneumatic tool includes a housing, a rotor, rotatably mounted within the housing, an output shaft operatively coupled to the rotor, and pressure chambers defined between the housing and the rotor. A pneumatic reverse valve having an overdrive is operatively coupled to the rotor. The overdrive provides increased torque and increased speed to the output shaft. The reverse valve controls flow of pressurized air to a multi-chambered motor of the tool such that the direction of the motor can be reversed and the number of pressure chambers receiving pressurized air can be selected regardless of direction.

Abstract: A trimming machine includes a centrifugal clutch for transmitting power from an internal combustion engine to a cutting blade. A manually operated throttle lever controls an output from the internal combustion engine by adjusting an opening of a throttle valve via a throttle wire. A friction member arranged to oppose to a clutch drum of the centrifugal clutch. A first swinging member is connected to the friction member and swings between a braking position to be pressed against the clutch drum and a releasing position to be spaced from the clutch drum. A second swinging member is connected to a connecting point at an intermediate portion of the throttle wire and pivots about a pivoting pin thereof with respect to the first swinging member when the throttle wire is moved by operating the throttle lever.

Abstract: A pneumatic tool includes a housing defining an air inlet and first and second exhaust passages and an air motor fluidly coupled to the air inlet and disposed in the housing. The motor produces exhaust air in operation and is fluidly coupled to the first and second exhaust passages. The tool also includes an exhaust valve carried by housing for selectively opening and closing only the second exhaust passage.

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 pneumatic rotary tool capable of operating in forward and reverse directions includes a housing and an output shaft projecting from the housing for transmitting torque to an object. An air motor drives rotation of the output shaft in the forward and reverse directions. Air passages extend from an air inlet to the motor for delivering pressurized air to the motor. One passage delivers air to the motor to power the motor to drive the output shaft in the forward direction and the other passage delivers air to the motor to power the motor to drive the output shaft in the reverse direction. A selector valve is disposed between the air inlet and the air passages such that fluid communication between the air inlet and the air passages is blocked except through the selector valve.

Abstract: A pneumatic tool (10) is described for diverting exhaust air from an air motor (18) between a rearward opening (22), a forward opening (24), or both, without requiring any disassembly. An exhaust diverting valve selector (26) allows adjustment of the direction of flow as determined by an exhaust diverting valve (60) from the exterior of tool (10). A method of manufacturing a pneumatic tool (10) with an exhaust diverting valve (60) is also disclosed.

Abstract: An ergonomic, hand-held power tool (10) is disclosed having a housing (12) formed to have a main body portion (14) having a cavity (32) and a handle portion (16) coupled to the main portion (14). The main body portion (14) has a first longitudinal axis (66). The handle portion (16) has a second longitudinal axis (68) formed to be at an acute angle (70) with respect to the first longitudinal axis (66). A flexible material (28) may be attached to the handle portion (16) or used to form an exterior coating on the housing (12) to help minimize any vibration transferred to the operator's hand.

Abstract: A power tool construction wherein an integrated pressure fluid motor is provided with a unitary motor cylinder and back head and an external cooperative porting surface for cooperation with a valve porting surface. A further feature of the construction provides a cooperating front head plate with concentric alignment lands for attachment of the motor and a power output device such as a gear reducer.