Abstract: A pneumatic tool with settable safety function, including: a main body having a flow way for a fluid to flow into the main body to drive a pneumatic cylinder; a switch disposed in the main body for blocking the flow way in normal state; a trigger disposed on the main body for triggering the switch; a safety device movable between an activation position and a non-activation position; and a switching button connected with the safety device and switchable to position the safety device in the activation position or non-activation position. When the safety device is positioned in the activation position, the trigger can be pulled to shift the switch to activate the pneumatic tool, while when the safety device is positioned in the non-activation position, the trigger cannot be pulled to shift the switch so as to provide a safety effect.

Abstract: A pneumatic cylinder of pneumatic tool capable of avoiding failure of bearings, including: a cylinder body having an internal cylindrical chamber in which a rotor is disposed, a rotary shaft being fixedly connected with the rotor, whereby high pressure air can flow into the cylinder body to drive and rotate the rotor and the rotary shaft; two end caps respectively covering two ends of the cylinder body, two ends of the rotary shaft respectively extending out of the cylinder body through the through holes of the two end caps; two bearings respectively installed in the cavities of the two end caps and fitted on two ends of the rotary shaft; and two airtight rings located between the bottom walls of the cavities and the bearings to achieve an airtight effect between the bottom walls of the cavities and the bearings.

Abstract: A pneumatic grinder with easily replacing grinding disc, including: a main body in which a rotary shaft is eccentrically pivotally connected with and is driven by a drive shaft of the pneumatic grinder, a bottom end of the rotary shaft being for mounting a grinding disc; a rotary member fixedly connected with the bottom end of the rotary shaft and synchronously rotatable with the rotary shaft; and an engaging mechanism movably mounted in the main body. When the engaging mechanism is moved to an engaging position, the engaging mechanism clogs the rotary member to prevent the rotary shat from rotating for replacing the grinding disc. After the replacement is completed, make the engaging mechanism move to a releasing position and releases the rotary member, permitting the rotary shaft to rotate.

Abstract: A pneumatic grinder with easily replacing grinding disc, including: a main body in which a rotary shaft is eccentrically pivotally connected with and is driven by a drive shaft of the pneumatic grinder, a bottom end of the rotary shaft being for mounting a grinding disc; a rotary member fixedly connected with the bottom end of the rotary shaft and synchronously rotatable with the rotary shaft; and an engaging mechanism movably mounted in the main body. When the engaging mechanism is moved to an engaging position, the engaging mechanism clogs the rotary member to prevent the rotary shat from rotating for replacing the grinding disc. After the replacement is completed, make the engaging mechanism move to a releasing position and releases the rotary member, permitting the rotary shaft to rotate.

Abstract: A dustproof grinder including: a main body; a rotary shaft vertically mounted in the main body and drivable by the driving unit, a bottom end of the rotary shaft having a plane face facing downward; a bottom cover formed with a central through hole, the bottom cover being disposed at the bottom end of the main body; the plane face of the rotary shaft being larger than the through hole and positioned above top face of the bottom cover; and a sealing member disposed between the plane face and the top face of the bottom cover. A grinding disc is mounted at a bottom end of the rotary shaft for grinding or buffing an object. The bottom cover is sealed with the bottom end of the main body, also, the bottom cover is sealed with the plane face so that the dirt, dusts and chips are prevented from entering the interior of the grinder.

Abstract: A pneumatic tool with settable safety function, including: a main body having a flow way for a fluid to flow into the main body to drive a pneumatic cylinder; a switch disposed in the main body for blocking the flow way in normal state; a trigger disposed on the main body for triggering the switch; a safety device movable between an activation position and a non-activation position; and a switching button connected with the safety device and switchable to position the safety device in the activation position or non-activation position. When the safety device is positioned in the activation position, the trigger can be pulled to shift the switch to activate the pneumatic tool, while when the safety device is positioned in the non-activation position, the trigger cannot be pulled to shift the switch so as to provide a safety effect.

Abstract: A dustproof grinder including: a main body; a rotary shaft vertically mounted in the main body and drivable by the driving unit, a bottom end of the rotary shaft having a plane face facing downward; a bottom cover formed with a central through hole, the bottom cover being disposed at the bottom end of the main body; the plane face of the rotary shaft being larger than the through hole and positioned above top face of the bottom cover; and a sealing member disposed between the plane face and the top face of the bottom cover. A grinding disc is mounted at a bottom end of the rotary shaft for grinding or buffing an object. The bottom cover is sealed with the bottom end of the main body, also, the bottom cover is sealed with the plane face so that the dirt, dusts and chips are prevented from entering the interior of the grinder.

Abstract: A pneumatic cylinder of pneumatic tool capable of avoiding failure of bearings, including: a cylinder body having an internal cylindrical chamber in which a rotor is disposed, a rotary shaft being fixedly connected with the rotor, whereby high pressure air can flow into the cylinder body to drive and rotate the rotor and the rotary shaft; two end caps respectively covering two ends of the cylinder body, two ends of the rotary shaft respectively extending out of the cylinder body through the through holes of the two end caps; two bearings respectively installed in the cavities of the two end caps and fitted on two ends of the rotary shaft; and two airtight rings located between the bottom walls of the cavities and the bearings to achieve an airtight effect between the bottom walls of the cavities and the bearings.

Abstract: A grinder with fast installable/detachable grinding disc, including: a main body; a rotary shaft disposed at bottom end of the main body, a shaft rod of the grinding disc being mounted in the shaft hole of the rotary shaft, whereby the grinding disc is drivable by the rotary shaft; a rotary switch mounted on the main body; a linking device mounted at bottom end of the main body and drivable by the rotary switch; and a detent mechanism mounted in the rotary shaft. When the rotary switch is rotated to drive and move the linking device to a first position, the detent mechanism is moved into the shaft hole of the rotary shaft to fix the shaft rod of the grinding disc in the shaft hole. When the rotary switch is rotated to drive and move the linking device to a second position, the detent mechanism is moved out of the shaft hole of the rotary shaft to release the shaft rod of the grinding disc. Accordingly, the grinding disc is fast replaceable by means of simple operation.

Abstract: Oil filling structure of pneumatic tool, including an airflow way formed in the main body for conducting high pressure air into a pneumatic cylinder disposed in the pneumatic tool. An air intake switch is connected with the airflow way for controlling opening/closing of the airflow way. An oil filling hole is disposed in air intake switch. When the switch is positioned in a close position, a lubricant can be filled into the oil filling hole to flow into the airflow way. The high pressure air can entrain the lubricant in the airflow way into the cylinder to lubricate and clean the cylinder.

Abstract: Base seat of a pneumatic grinder, including an air way and a water way disposed in the base seat to respectively communicate with an air chamber and a water chamber formed in the base seat. Several water outlets and a predetermined number of air rooms are disposed on a bottom face of the base seat. The water outlets communicate with the water chamber, while the air rooms communicate with the air chamber. Multiple ball bodies are respectively rollably disposed in the air rooms, the bottom edge of the ball bodies protrude from the bottom face of the base seat. When high pressure air and water are conducted into the air way and water way, the air is conducted by the air way to flow into the air chamber and to blow to the ball bodies in the air rooms making the ball bodies rolling easily. The water flows through the water way into the water chamber and then flows through the water outlets out of the bottom face of the base seat to reduce frictional force against the bottom face of the base seat.

Abstract: Flow way structure of pneumatic tool, including: a main body; a connector rotatably disposed on the main body; an air inlet, a water inlet and at least one air outlet concentrically arranged on the connector, inner end of each air outlet communicating with an air chamber of the main body; an air inlet switch and a water inlet switch mounted in the main body for controlling the flow of the fluid; an air way for conducting the air into the main body and communicating with a pneumatic cylinder disposed in the main body; and a water way for conducting the water into the main body. Two ends of the air way and water way are concentrically respectively connected with the air inlet and water inlet. When the connector rotates on the main body, the air inlet and the water inlet respectively still keep communicating with the air way and water way. In use, the air and water are respectively conducted from the air way and water way into the main body.

Abstract: A grinder with easily installable/detachable grinding disc, including: a main body in which a driving unit is disposed for driving a rotary shaft, an annular toothed section being formed on the circumference of the rotary shaft; a bracket rotatably disposed under the bottom face of the main body; a support tray disposed under the bracket, several rail channels being radially formed on the support tray; and a predetermined number of detent members respectively slidably disposed in the rail channels. When turning the bracket, the detent members are driven to move along the rail channels. When the detent members are contracted, the arched toothed sections of the inner ends of the detent members engage with the annular toothed section of the rotary shaft, whereby the rotary shaft cannot rotate for replacing grinding disc. After replacing the grinding disc, the detent members are moved outward along the rail channels to disengage from the rotary shaft.

Abstract: Base seat of pneumatic grinder, including an air way and a water way disposed in the base seat to respectively communicate with an air chamber and a water chamber formed in the base seat. Several water outlets and a predetermined number of air rooms are disposed on bottom face of the base seat. The water outlets communicate with the water chamber, while the air rooms communicate with the air chamber. Multiple ball bodies are respectively rollably disposed in the air rooms, the bottom edge of the ball bodies protrude from the bottom face of the base seat. When high pressure air and water are conducted into the air way and water way, the air is conducted by the air way to flow into the air chamber and to blow to the ball bodies in the air rooms making the ball bodies rolling easily. The water flows through the water way into the water chamber and then flows through the water outlets out of the bottom face of the base seat to reduce frictional force against the bottom face of the base seat.

Abstract: Flow way structure of pneumatic tool, including: a main body; a connector rotatably disposed on the main body; an air inlet, a water inlet and at least one air outlet concentrically arranged on the connector, inner end of each air outlet communicating with an air chamber of the main body; an air inlet switch and a water inlet switch mounted in the main body for controlling the flow of the fluid; an air way for conducting the air into the main body and communicating with a pneumatic cylinder disposed in the main body; and a water way for conducting the water into the main body. Two ends of the air way and water way are concentrically respectively connected with the air inlet and water inlet. When the connector rotates on the main body, the air inlet and the water inlet respectively still keep communicating with the air way and water way. In use, the air and water are respectively conducted from the air way and water way into the main body.

Abstract: Oil filling structure of pneumatic tool, including an airflow way formed in the main body for conducting high pressure air into a pneumatic cylinder disposed in the pneumatic tool. An air intake switch is connected with the airflow way for controlling opening/closing of the airflow way. An oil filling hole is disposed in air intake switch. When the switch is positioned in a close position, a lubricant can be filled into the oil filling hole to flow into the airflow way. The high pressure air can entrain the lubricant in the airflow way into the cylinder to lubricate and clean the cylinder.

Abstract: A grinder with easily installable/detachable grinding disc, including: a main body in which a driving unit is disposed for driving a rotary shaft, an annular toothed section being formed on the circumference of the rotary shaft; a rotary disc rotatably disposed around the main body; a bracket disposed under the bottom face of the main body and drivable by the rotary disc; a support tray disposed under the bracket, several rail channels being radially formed on the support tray at equal intervals; and a predetermined number of detent members respectively slidably disposed in the rail channels. When turning the rotary disc, the detent members are moved along the rail channels and contracted or expanded to make the arched toothed sections of inner ends of the detent members engage with or disengage from the annular toothed section of the rotary shaft.

Abstract: A pneumatic tool with safety effect, including: a main body formed with an internal flow way for a fluid to flow into the main body to drive a cylinder therein; a press switch disposed in the main body for blocking the flow way in normal state; a trigger disposed on the main body for pressing the press switch; a slide member slidably disposed on the main body; and a linking member disposed on the slide member. In normal state, the slide member is such positioned that a position difference exists between the linking member and the press switch. When activating the pneumatic tool, a user pushes the slide member to move the linking member to a position above the press switch. By means of pressing the trigger, the linking member is driven to press the press switch.

Abstract: A speed adjusting device for a pneumatic grinding tool includes an axle having a passage defined longitudinally therein and a plurality of apertures are defined in an outer periphery of the axle. A base is mounted and rotated with the axle. A plurality of slide members are respectively and movably received in the slide paths in the base. A disk has a flange extending from a periphery of a front side of the body and a neck extends from a rear side of the body. A plurality of air holes are defined through the neck. The disk is movably mounted on the axle and rotated with the axle. The flange covers the outside of the base. The air holes are located in alignment with the apertures when in normal condition. The air holes are located off alignment with the apertures when the disk is pushed backward by the slide members affected by centrifugal force.