Abstract: A pneumatic tool includes a tool body and a driving unit. The tool body has a handle portion having opposite front and rear handle ends along a first axis, and a head portion that is connected to the front handle end of the handle portion, and that has opposite first and second head ends along a second axis perpendicular to the first axis. A ratio of the sum of a width of the head portion along the first axis and a distance between the front and rear handle ends of the handle portion to a distance between the first and second head ends is equal to or greater than 2. The driving unit is mounted in the head portion, and includes a cylinder operated by high pressure air, and a power transmission member driven by the cylinder for power transmission.

Abstract: A pneumatic impact tool includes a housing, a power output unit, a transmission unit, and an oil seal assembly. The housing has first and second accommodating chambers, and first and second oil inlets in fluid communication with the first and second accommodating chambers, respectively, and permitting lubricating oil to be fed into the first and second accommodating chambers therethrough. The power output unit is centered at a Z-axis, and is disposed in the first accommodating chamber for power outputting. The transmission unit is centered at an X-axis, and is disposed in the second accommodating chamber for transmitting a power to the power output unit. The oil seal assembly prevents flow of the lubricating oil out of the first and second accommodating chambers.

Abstract: A pneumatic ratchet wrench includes a transmission mechanism (200) having a transmission shaft (210) with a driving end (211) and a transmitting end (212) extended from the driving end (211), a clutch seat (240) and two hammer rings (250), a pneumatic motor (300) and a ratchet joint (400). Two opposite anvils (220) are formed on the driving end (211), and an eccentric shaft (230) is axially protruded from the transmitting end (212). The clutch seat (240) is rotably sheathed on the driving end (211) and has two parallel limit pins 241, and the hammer rings (250) are installed to the limit pins (241) and corresponsive to the anvils (220) respectively. The pneumatic motor (300) is coupled to the clutch seat (240) for driving and rotating the clutch seat (240). The ratchet joint (400) is coupled to the eccentric shaft (230) and driven by the transmission shaft (210).

Abstract: A ratchet wrench includes a direction switching device. The direction switching device includes two switching members for controlling the rotational direction of a gear, a resilient unit disposed among a body and the switching members for biasing the switching members away from the gear, and a ring unit disposed rotatably on the body. The ring unit includes a convex portion and a concave portion, and is operable to allow the convex portion and the concave portion to act on the switching members, so that one of the switching members comes into contact with the gear, while the other of the switching members is removed from the gear. When no external force is applied to the ring unit, the switching members are biased by the resilient unit to remove from the gear.

Abstract: A pneumatic driven ratchet wrench comprises: a wrench housing; a pneumatic motor; a ratchet wheel unit; two gear members; an urging member for biasing the gear members to engage the ratchet wheel; a transmission unit connected to the gear members and driven by the pneumatic motor; and a gear-selecting unit including an operating knob, a switching member and two pushing members. The operating knob is mounted on the wrench housing and is disposed distal from a head section of the wrench housing for driving movement of the pushing members. Each of the pushing members pushes a respective one of the gear members to move away from the ratchet wheel unit when moved from a releasing position to a pushing position.

Abstract: A pneumatic tool includes a front handle section having an axial hole unit formed in a bifurcated front end, a bush unit extending into the axial hole unit, a driving head extending through the axial hole unit and obstructed by the bush unit, and a position limiting unit including at least one stop member disposed on an exposed section of the driving head, and a compression spring disposed between the bush unit and the driving head. The compression spring biases the stop member to contact the bush unit. As such, the driving head is fixed in the bifurcated front end of the front handle section, so as to prevent deformation of the bifurcated front end due to rotation of the driving head relative to the front handle section.

Abstract: A reciprocal switching structure of a ratchet wrench is provided and includes a case, a gear assembly, two gear racks, a reciprocal switching mechanism, and a transmission unit. The case has a first end and a second end, wherein the second end is adjacent to a gripping part of the ratchet wrench and is opposite to the first end. The gear assembly is pivotally disposed in the case. The two gear racks engage or disengage from the gear assembly reciprocally. The reciprocal switching mechanism is disposed in the case and includes two push rods and at least one reciprocal switching member. The transmission unit pivotally is disposed in the case, and is pivotally connected between the two gear racks for driving the two gear racks to be displaced.

Abstract: A power driven ratchet wrench includes a wrench body, an output unit including a driving head rotatable about a Z-axis and adapted for outputting a power, a driving unit including a rotor rotatable about an X-axis perpendicular to the Z-axis, and a transmission unit. The transmission unit includes an eccentric projection connected eccentrically to the rotor and rotatable about the X-axis, two racks connected to the output unit, and an eccentric yoke disposed pivotally in the wrench body. A yoke body of the yoke has a slot permitting the eccentric projection to move therein, and a connecting portion connected to the racks at positions misaligned from the X-axis. The X-axis extends through the slot. The connecting portion drives the racks and the driving head to rotate.

Abstract: A pneumatic ratchet wrench includes a main body, an output unit, a driving unit, and a transmission unit. The main body has a handle section and a shrunk head section narrower than the handle section. The output unit includes a driving head for outputting a power. At least a major portion of the output unit is disposed within the shrunk head section. The driving unit is disposed within the main body for generating the power pneumatically. The transmission unit is disposed within the handle section for transmitting the power to the driving head.

Abstract: A reciprocal switching structure of a ratchet wrench is provided and includes a case, a gear assembly, two gear racks, a reciprocal switching mechanism, and a transmission unit. The case has a first end and a second end, wherein the second end is adjacent to a gripping part of the ratchet wrench and is opposite to the first end. The gear assembly is pivotally disposed in the case. The two gear racks engage or disengage from the gear assembly reciprocally. The reciprocal switching mechanism is disposed in the case and includes two push rods and at least one reciprocal switching member. The transmission unit pivotally is disposed in the case, and is pivotally connected between the two gear racks for driving the two gear racks to be displaced.

Abstract: A pneumatic tool includes a shell body with an air-feeding path, a cylinder including first and second air passages, a rotary valve, and a valve control component. The rotary valve has an intermediate air passage, and is rotatable among first, second and third angular positions to control airflows from the air-feeding passage to the first and second air passages, so as to control output power of the pneumatic tool. The valve control component is disposed on the shell body and is operable by an external force to bring the rotary valve into rotation among the first, second and third angular positions.

Abstract: A pneumatic tool includes a handle body, an output unit having a driving head, a driving unit for driving the output unit, and a switching unit operable to change the rotational direction of the driving head. The handle body includes: a surrounding wall having a top surface and an axial space that has a central axis and that is adapted to permit the driving unit to be mounted therein; a mounting unit disposed at the top surface of the surrounding wall and adapted to permit the switching unit to be mounted therein; and a through hole formed vertically through the surrounding wall and in spatial communication with the axial space, the through hole being adapted to permit the output unit to be mounted therein.

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 motor assembly for a pneumatic tool includes: a motor cylinder coaxially secured in a tubular inner housing, which is coaxially secured in a tubular outer housing and has an inlet passage defining a longitudinal axis, including a valve seat, and defining forward and reverse passages that communicate with a motor chamber and extend through the valve seat, and an exhaust port that communicates with the motor chamber, and a throttle passage defined between the inner and outer housings; a motor rotor supported within the motor chamber and rotatable in a forward or reverse direction; and a rotary valve coaxially disposed in the inner housing, supported by the valve seat, and rotatable about the longitudinal axis between forward and reverse positions.

Abstract: A pneumatic driven ratchet wrench comprises: a wrench housing; a pneumatic motor; a ratchet wheel unit; two gear members; an urging member for biasing the gear members to engage the ratchet wheel; a transmission unit connected to the gear members and driven by the pneumatic motor; and a gear-selecting unit including an operating knob, a switching member and two pushing members, The operating knob is mounted on the wrench housing and is disposed distal from a head section of the wrench housing for driving movement of the pushing members. Each of the pushing members pushes a respective one of the gear members to move away from the ratchet wheel unit when moved from a releasing position to a pushing position.

Abstract: An pneumatic tool includes a front section, a rear section connected to and disposed behind the front section, a driving unit, and an air cylinder unit. The rear section includes a main body, a handle connected to the main body and adjacent to the front section, and an intake passage in fluid communication with the outside. The air cylinder unit includes a first cylinder mounted within the rear section, a second cylinder connected to the first cylinder, an extension portion extending into the handle, and an inclined intake channel having an inlet in fluid communication with intake passage, and an outlet in fluid communication with the first cylinder. The rotor unit is mounted rotatably within the first and second cylinders for activating the driving unit.