Abstract: A nail gun having a protection structure includes a body, a protection cover and a resilient release. The body includes a nail magazine loaded with nails and includes a barrel connected to the nail magazine. One end of the barrel has a nozzle, and the nail magazine forms a notch close to the nozzle and includes a fastening recess. The protection cover is slidably disposed on the nail magazine. The protection cover includes an engagement board, a sliding board connected to the same, and an engagement hole formed on the engagement board. The resilient release is resiliently assembled in the fastening recess and contacts and presses against an inner edge of the engagement hole, so that the protection cover is positioned by the resilient release, and the sliding board covers the notch.

Abstract: A nail gun includes a gun body, a safety unit and an adjusting unit. The safety unit includes a first safety member movable relative to the gun body, and a second safety member for being pushed by the first safety member. The adjusting unit includes a switch member movable between a deep-drive position and a shallow-drive position. The switch member has a first abutment surface aligned with the first safety member when the switch member is at the deep-drive position, and a second abutment surface aligned with the first safety member when the switch member is at the shallow-drive position.

Abstract: A pneumatic tool with changeable exhaust direction includes a tool main body and a direction change assembly. The tool main body includes a housing portion having a first exhaust channel. The direction change assembly includes an air guidance member and an adjustment member. The air guidance member is mounted onto the housing portion, and a second exhaust channel is formed with the air guidance member. The adjustment member is installed with a sealing ring. The adjustment member generates an axial movement relative to the air guidance member and along a first axis to move away from the air guidance member in order to open the second exhaust channel or to allow the sealing member to abut against the air guidance member in order to close the second exhaust channel. Accordingly, the exhaust direction is adjustable during the use of the pneumatic tool in order to facilitate different processing operations.

Abstract: A pneumatic tool includes a casing unit, an air motor, a rotary valve, and a turning unit. The rotary valve is mounted to the air motor and is rotatable about a valve axis. The turning unit includes a ring member that surrounds and is rotatably mounted to the casing unit, and that is connected to the rotary valve, such that rotation of the ring member relative to the casing unit drives the rotary valve to rotate about the valve axis relative to the air motor among a first-end position, a second-end position and at least one in-between position for adjusting airflow that travels from an air inlet passage of the casing unit, through an opening and an intermediate passage of the rotary valve, to an air chamber of the air motor.

Abstract: A dual action sander includes a housing, a motor shaft balancer, a balancer shaft, an engaging member and a control rod unit. The motor shaft balancer is disposed in the housing, and is rotatable about a first axis. The control rod unit is movable along the first axis between a locked position, where the balancer shaft is not permitted to rotate about a second axis that is parallel to and spaced apart from the first axis, and an unlocked position, where the balancer shaft is permitted to rotate about the second axis. The engaging member is mounted to one of the balancer shaft and the control rod unit, and is engaged with the other one of the balancer shaft and the control rod unit when the control rod unit is in the locked position.

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: An impact device for an electric nail gun having a flywheel includes a swing arm unit and an impact unit. The impact unit includes an impact member adapted to be disposed between the flywheel and the swing arm unit, and a magnetic element set mounted to the impact member, spaced apart from the swing arm unit to form a gap therebetween, and providing a magnetic force which magnetically attracts a magnetically conductive component of the swing arm unit. The swing arm unit is movable between a pre-firing position where the impact member is not in contact with the flywheel, and a firing position where the impact member is in contact with the flywheel such that rotation of the flywheel drives the impact unit to move on the swing arm unit.

Abstract: A return device includes a return wheel unit adapted to be mounted to a gun body of a fastening tool, and including a return wheel that is movable between a free position, where the return wheel is not in contact with an impact member of the fastening tool, and a return position, where the impact member is at a strike position and is not contact with a rotatable flywheel of the fastening tool, and where the return wheel is in contact with the flywheel and the impact member such that, when the flywheel rotates in a first rotational direction, the return wheel is driven by the flywheel to rotate in a second rotational direction opposite to the first rotational direction, and moves the impact member from the strike position to a standby position.

Abstract: A firing control device for use in a pneumatic tool includes a flow path unit, a conditioning valve and a switch valve. The flow path unit is connected to a main. chamber and an operating chamber of the pneumatic tool. The conditioning valve blocks fluid communication between the main chamber and the operating chamber via the flow path unit. When the switch valve is activated, the pressure in the casing is permitted to move the conditioning valve. The conditioning valve is moved to permit the fluid communication between the main chamber and the operating chamber via the flow path unit when the switch valve is continuously activated by a predetermined time period.

Abstract: A pneumatic nail gun includes a main body, a cylinder, a muzzle device, a lifting wheel, a piston, a lifting rod, and a nail-striking pin. The piston is movable between a striking position and a non-striking position. The lifting rod is connected to the piston, and has an engaging portion that is engaged with the lifting wheel such that rotation of the lifting wheel drives the piston to the non-striking position, and that is disengaged from the lifting wheel such that the piston is driven by air pressure inside the cylinder to the striking position. The nail-striking pin is connected removably and co-movably to the piston, is spaced apart from the lifting rod, and is adapted for striking a nail when the piston is at the striking position.

Abstract: A nail gun includes a muzzle device, a cartridge device and a driving device. The muzzle device includes a safety member having an abutment end retractable when pushed. The cartridge device includes a stop member for blocking the drive stroke when a number of the nails is less than a predetermined number. The driving device includes a linking member co-movable with the safety member, and a trigger unit including a pivotable trigger, an inner arm co-movable with the trigger, and a switch member. When the switch member is at a sequential striking position and when the trigger is pivoted before a rearward movement of the linking member, the inner arm is withdrawn from a route of the rearward movement to avoid actuation of the drive stroke.

Abstract: A safety member is adapted for use in a muzzle of a nail gun. The muzzle defines a nail passage that is for passage of a nail, and a gap that spatially communicates with the nail passage. The safety member is slidable in a nail striking direction of the nail, and includes a slider adapted to be disposed in the gap, and having a flat surface, a platform and an abutment end. The flat surface is adapted to face the plate member. The platform protrudes from the flat surface toward the plate member and cooperates with the plate member to define a nail ejection opening therebetween. The abutment end extends from the platform and extends beyond the nail ejection opening for contact with an object to be fastened.

Abstract: A driving device is adapted for use in an electric nail gun. The electric nail gun includes a supporting frame. The driving device includes a swing arm unit, a control unit and a driving unit. The swing arm unit is swingable between a standby position and a shooting position. The control unit includes a control member having a driven end portion, and an abutting end portion opposite to the driven end portion. The driving unit is for driving the driven end portion of the control member to rotate between a driving position and a non-driving position, and includes a control-member biasing resilient member disposed between the driven end portion of the control member and the supporting frame.

Abstract: A return device includes a return wheel unit adapted to be mounted to a gun body of a fastening tool, and including a return wheel that is movable between a free position, where the return wheel is not in contact with an impact member of the fastening tool, and a return position, where the impact member is at a strike position and is not contact with a rotatable flywheel of the fastening tool, and where the return wheel is in contact with the flywheel and the impact member such that, when the flywheel rotates in a first rotational direction, the return wheel is driven by the flywheel to rotate in a second rotational direction opposite to the first rotational direction, and moves the impact member from the strike position to a standby position.

Abstract: A pneumatic tool includes a main body unit, a switch unit and a trigger unit. The main body unit defines a flow path, and an annular space surrounding the flow path. The flow path includes a front path section, and a rear path section separated from the front path section. The switch unit includes a sleeve member movable relative to the main body unit between an opening position where fluid communication between the front path section and the rear path section is permitted, and a closing position where fluid communication between the front path section and the sear path section is prevented. The trigger unit is rotatably mounted to the main body unit, and includes a trigger member operable to move the sleeve member between the opening position and the closing position.

Abstract: A pneumatic device includes a cylinder, a buffer member and a piston unit. The cylinder includes a cylinder wall defining an air chamber. The buffer member has a tubular wall that defines a communicating hole. The tubular wall has a length greater than the wall thickness thereof. The piston unit includes a sealing member, and a rod member movably extending through the communicating hole. The rod member has a driven section received within the air chamber and mounted with the sealing member. The piston unit is movable between a restoring position where the driven section is spaced apart from the buffer member, and an impact position where at least one of the driven section and the sealing member is in contact with the buffer member.

Abstract: A nail gun includes a gun body, a safety unit and an adjusting unit. The safety unit includes a first safety member movable relative to the gun body, and a second safety member for being pushed by the first safety member. The adjusting unit includes a switch member movable between a deep-drive position and a shallow-drive position. The switch member has a first abutment surface aligned with the first safety member when the switch member is at the deep-drive position, and a second abutment surface aligned with the first safety member when the switch member is at the shallow-drive position.

Abstract: An impact device for an electric nail gun having a flywheel includes a swing arm unit and an impact unit. The impact unit includes an impact member adapted to be disposed between the flywheel and the swing arm unit, and a magnetic element set mounted to the impact member, spaced apart from the swing arm unit to form a gap therebetween, and providing a magnetic force which magnetically attracts a magnetically conductive component of the swing arm unit. The swing arm unit is movable between a pre-firing position where the impact member is not in contact with the flywheel, and a firing position where the impact member is in contact with the flywheel such that rotation of the flywheel drives the impact unit to move on the swing arm unit.

Abstract: A blade holding device for securely holding a saw blade includes a holding unit, a sleeve member, a retaining unit, and a shell. The holding unit includes a clamp member and an insert. The clamp member has two half portions defining a gap for receiving the saw blade, a slot extending through one of the half portions, and an abutment surface. The insert is inserted into the slot, abuts against the abutment surface, and has a threaded hole. The sleeve member surrounds the half portions of the clamp member without blocking the threaded hole. The retaining unit includes a fastening member extending threadedly through the threaded hole for pressing against the saw blade. The shell surrounds the sleeve member and the clamp member.

Abstract: A trigger assembly used in a pneumatic tool that includes a valve unit removably blocking a flow channel, includes a driving member, a trigger member and a positioning unit. The driving member is movable for actuating the valve unit to gradually unblock the flow channel. The trigger member is pressable to move relative to a tool body of the pneumatic tool and the driving member to drive movement of the driving member. The positioning unit includes first and second positioning structures inter-engaged for providing an indication when the trigger member is pressed to move the driving member to a certain position.