Abstract: An eccentric seat of an automobile grinding machine has a base, a grinding device, and a linking-fixing unit. The base has a base hole formed in the base. The grinding device is mounted in the base and has a grinding head. The grinding head has a head hole aligned with the base hole. The linking-fixing unit is mounted in the base hole and can move along the axial direction of the base hole and can be engaged the base. The linking-fixing unit has an inserting end that can be engaged in the head hole. When the inserting end is inserted into the head hole, the grinding head is fixed relative to the base, such that it is easy for the grinding head to combine with a grinding body, and the eccentric seat is suitable for polishing a surface of an automobile.

Abstract: A power device with a unicorn impact unit includes a handle, a housing, an impact unit and ratchet unit. The handle has a front end and a motor mounted at the front end and has a driving shaft. The housing is mounted at the front end of the handle and is sleeved around the motor has a rotation chamber formed inside the housing. The impact unit is rotatably mounted in the rotation chamber and has a mounting seat, a hammer and an anvil shaft. The anvil shaft inserts into the hammer and is mounted on the mounting seat. The ratchet unit is mounted in the rotation chamber, is connected with anvil shaft. The impact unit only effect toward one direction when rotating, so the handle has no necessary to set a button for switching rotation directions of motor and the design of the handle can be simplified.

Abstract: A pneumatic motor includes a housing, a rotor, an air flowing unit and an air-supply unit. The housing has an inside space formed along an axis and divided sequentially into a rotor chamber, a valve chamber and an inlet chamber. The rotor is rotatably mounted in the rotor chamber. The pneumatic valve is mounted in the rotor chamber and the valve chamber and includes an air flowing unit and an adjusting gate. The air-supply unit is mounted in the inlet chamber and is connected to a source of compressed air, so the compressed air can flow from the inlet chamber into the valve chamber and then flow through the pneumatic valve to drive the rotor.

Abstract: A pneumatic tool has an outer casing, a selector valve, a switching button and a cover. The outer casing has two elongated holes formed through an external surface of the outer casing, facing and communicating to each other. The selector valve is rotatably mounted in the outer casing and has a communicating hole and two connecting blocks. The connecting blocks are axially formed on and protrude from an external surface of the selector valve, align with each other and respectively face to the elongated holes. The switching button is detachably connected to one of the connecting blocks and extends out of one of the elongated holes. The cover is detachably connected to the outer casing to cover the other elongated hole and has a shape corresponding to a shape of the external surface of the outer casing.

Abstract: An eccentric seat of an automobile grinding machine has a base, a grinding device, and a linking-fixing unit. The base has s base hole formed in the base. The grinding device is mounted in the base and has a grinding head. The grinding head has a head hole aligned with the base hole. The linking-fixing unit is mounted in the base hole and can move along the axial direction of the base hole and can be engaged the base. The linking-fixing unit has an inserting end that can be engaged in the head hole. When the inserting end is inserted into the head hole, the grinding head is fixed relative to the base, such that it is easy for the grinding head to combine with a grinding body, and the eccentric seat is suitable for polishing a surface of an automobile.

Abstract: An air-inlet switching assembly for a pneumatic tool having a gun shaped shell and a cylinder, the air-inlet switching assembly is mounted in the shell below the cylinder and has a selector valve and a switching stem. The selector valve is rotatably mounted in an inlet tube of the shell below the cylinder, selectively communicates one of the passageways of the cylinder and has a clamping protrusion and a valve seat. The clamping protrusion is formed eccentrically on and protrudes from the external surface of the selector valve. The valve seat is formed on and protrudes upward from a top of the selector valve and has a valve hole selectively communicating with one of the passageways of the cylinder. The switching stem is movably mounted in the shell, is connected securely to the selector valve and has a clamping arm connected securely to the clamping protrusion of the selector valve.

Abstract: A ratchet wrench has a handle, a transmitting device, a torque adjusting device and a ratchet head. The transmitting device is connected to the handle and has a barrel, a transmitting seat and a transmitting shaft. The barrel is connected to the handle and has two threaded segments and multiple elongated holes. The transmitting shaft is rotatably mounted in the barrel and has a driving disk and an eccentric rod. The torque adjusting device is connected to the transmitting device and has a casing, a limiting assembly and a spring. The casing is connected to the barrel. The limiting assembly is mounted around the transmitting shaft and has two pressing rings and a push bearing. The spring is mounted around the transmitting shaft and presses against the pressing rings to push the holding pins abutting with the holding recess. The ratchet head is connected to the transmitting device.

Abstract: A ratchet wrench has a handle, a transmitting device, a torque adjusting device and a ratchet head. The transmitting device is connected to the handle and has a barrel, a transmitting seat and a transmitting shaft. The barrel is connected to the handle and has two threaded segments and multiple elongated holes. The transmitting shaft is rotatably mounted in the barrel and has a driving disk and an eccentric rod. The torque adjusting device is connected to the transmitting device and has a casing, a limiting assembly and a spring. The casing is connected to the barrel. The limiting assembly is mounted around the transmitting shaft and has two pressing rings and a push bearing. The spring is mounted around the transmitting shaft and presses against the pressing rings to push the holding pins abutting with the holding recess. The ratchet head is connected to the transmitting device.

Abstract: An impact assembly is used for a power tool having a chamber, a handle and a rotary driver mounted in the chamber near the handle and having a driving shaft. The impact assembly has a hammer frame, at least one hammer, two hammer pins and an output axle. The hammer frame is connected to the rotary driver and has a mounting recess, a driver mount and a through hole. The at least one hammer is pivotally mounted in the mounting recess and each hammer has an engaging hole, a loosening protrusion and a tightening protrusion. The hammer pins are mounted in the hammer frame to pivotally connect each hammer to the hammer frame. The output axle is mounted in the hammer frame and the engaging hole of each hammer and protrudes out of the through hole.

Abstract: A polishing machine includes a body. A driving motor is installed in the body. The driving motor has an eccentric shaft mounted at a bottom of the motor, and a polishing wheel connector mounted under the eccentric shaft. A dust shield is mounted on the body and outside the driving motor. Multiple brake units are mounted at a bottom of the dust shield. A polishing wheel is mounted under the dust shield and fastened on the polishing wheel connector by a threaded pin formed at a center of the polishing wheel. The polishing wheel is in contact with the multiple brake units.

Abstract: A polishing machine includes a body. A driving motor is installed in the body. The driving motor has an eccentric shaft mounted at a bottom of the motor, and a polishing wheel connector mounted under the eccentric shaft. A dust shield is mounted on the body and outside the driving motor. Multiple brake units are mounted at a bottom of the dust shield. A polishing wheel is mounted under the dust shield and fastened on the polishing wheel connector by a threaded pin formed at a center of the polishing wheel. The polishing wheel is in contact with the multiple brake units.

Abstract: A pneumatic tool has a body, a chuck bracket, an exhaust ring and a noise suppressor. The body has a recess and multiple exhaust channels. The exhaust channels are respectively defined in the recess. The chuck bracket is mounted on the front end of the body. The exhaust ring is mounted on the recess in the body and has multiple exhaust channels defined in the exhaust ring. The noise suppressor is mounted between the recess in the body and the exhaust ring, and is made of a material that absorbs sound and air.

Abstract: A transmission shaft has a proximal end, a distal end, a socket, a locking element, an outer surface and a driving part. The proximal end is mounted securely in a hand tool or a power tool. The socket is formed in the distal end and a tool head is mounted securely in the socket. The locking element is mounted in the socket to secure the tool head. The driving part is formed on the outer surface near the distal end and a sleeve is mounted securely around the driving part. The transmission shaft can be mounted with the tool head by the socket and be mounted with the sleeve by the driving part.

Abstract: A power tool includes an annular recess adapted to be defined in the peripheral edge to receive therein a resilient loop, a slot adapted to be defined in a side face of the peripheral edge and a hole defined in a side face defining the slot to communicate with the annular recess so as to movably receive therein a ball such that engagement between the resilient loop and a first auxiliary tool mounted outside the driving end is secured because of engagement of the resilient loop to an inner face of the auxiliary tool.