Abstract: A belt sander includes: a power unit having a rotating shaft; a rotatable belt casing defining a track groove that is open toward the power unit and that surrounds the rotating shaft, and having a plurality of engaging portions that are arranged around the track groove; an abrasive belt drivable by the rotating shaft; and a positioning unit including a movable positioning member that is adapted for manual operation, and an engaging member that is co-movably connected to the positioning member. The positioning unit is movable between an engaging position, where the engaging member is engaged with a selected one of the engaging portions, and a releasing position, where the engaging member is disengaged from the engaging portions.

Abstract: A nail gun includes a frame unit, a power unit that is configured to drive a nail-striking action during a driving process, a switch unit that includes a first switch and a second switch configured to initiate the driving process when both actuated, a safety unit that is operable to convert between a non-triggerable state and a triggerable state for actuating the first switch, and that includes a moving assembly that is movable relative to the frame unit along a moving path, and a trigger unit that includes a trigger pivotable between a sequential firing position and a continuous firing position, and an operating member pivotable between the trigger and the second switch.

Abstract: A retaining device adapted for use with an electric nail gun includes: a swing arm unit adapted to swing relative to a flywheel of the nail gun; an impact unit adapted to swing with the swing arm unit, and being movable between a pre-striking position proximate to the flywheel, and a striking position distal from the flywheel; a retrieving unit configured to bias the impact unit to move to the pre-striking position; and first and second positioning members connected respectively to the swing arm unit and the impact unit, and telescopically engaged with and in frictional contact with each other when the impact unit is at the pre-striking position, so as to position the impact unit on the swing arm unit.

Abstract: A flywheel device is adapted to be installed in an electric nail gun. The electric nail gun includes a main frame, a drive pulley rotatably mounted to the main frame, and a transmission belt. The flywheel device includes a flywheel pulley adapted to be mounted to the main frame, a flywheel connected coaxially and co-rotatably to the flywheel pulley, and a weight disc connected coaxially and co-rotatably to the flywheel and the flywheel pulley. The transmission belt is trained on the drive pulley and the flywheel pulley. During co-rotation of the flywheel pulley, the flywheel and the weight disc, a swing arm is pivotable to move an impact member to contact the flywheel for actuating a nailing process of the electric nail gun.

Abstract: A pneumatic tool includes a casing unit, an air motor, a rotary valve, and a turning unit. The rotary valve is rotatably mounted to the air motor. The turning unit is movably mounted to the casing unit, and is connected to the rotary valve such that movement of the turning unit relative to the casing unit drives rotation of the rotary valve relative to the air motor to one of a first-end position, a second-end position and at least one in-between position, in which an opening of the rotary valve is in spatial communication with a respective one of a first passage, a second passage and at least one sub-passage for adjusting airflow that travels from an air inlet passage of the casing unit, through the rotary valve, and into the air motor.

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 retaining device adapted for use with an electric nail gun includes: a swing arm unit adapted to swing relative to a flywheel of the nail gun; an impact unit adapted to swing with the swing arm unit, and being movable between a pre-striking position proximate to the flywheel, and a striking position distal from the flywheel; a retrieving unit configured to bias the impact unit to move to the pre-striking position; and first and second positioning members connected respectively to the swing arm unit and the impact unit, and magnetically attracted to each other to prohibit removal of the impact unit from the pre-striking position when the impact unit is at the pre-striking position.

Abstract: A retaining device adapted for use with an electric nail gun includes a retaining member; a swing arm unit adapted to swing between a proximate position and a distal position with respect to a flywheel of the nail gun; an impact unit movably connected to the swing arm unit, including an engaging portion, and being movable between a pre-striking position, where the engaging portion is confined within the retaining member when the swing arm unit is at the distal position, and a striking position, where the engaging portion is removed from the retaining member; and a retrieving unit connected between the impact unit and the swing arm unit, and configured to bias the impact unit to move to the pre-striking position.

Abstract: A pneumatic nail gun includes a gun body, a muzzle connected to the gun body for receiving a nail, a cylinder unit disposed in the gun body, an air valve unit having a cover portion, and a striking unit having a piston. The cylinder unit includes a gas storage chamber, a striking cylinder having a cylinder chamber 510 in fluid communication with the gas storage chamber, and at least one gas storage cylinder in fluid communication with the gas storage chamber for receiving a gas having a pre-determined gas pressure. The cover portion is operable to interrupt fluid communication between the cylinder chamber and the gas storage chamber, and to allow the fluid communication such that the piston is pushed by the gas to strike the nail.

Abstract: Provided is a control system and method for a power-driven nail gun, which includes a battery, a motor, a flywheel rotating along with the motor, an impacting member receiving kinetic energy of the flywheel and a nail channel providing a channel for a nail to move along therewith when hit by the impacting member. The method includes utilizing a microcontroller to provide a pulse width modulation (PWM) signal for a driving circuit to drive the motor based on the PWM signal; and in response to reaching a target rotation speed by the motor, utilizing the microcontroller to output a corresponding PWM duty to the driving circuit based on the voltage of the battery, to make the motor maintain at the target rotation speed. The nails obtain stable and consistent kinetic energy and stability of nail firing is effectively improved.

Abstract: A retrieving device is adapted to be installed in an electric nail gun. The retrieving device includes at least one stationary seat that is adapted to be connected to a swing arm of the nail gun and that has at least one stationary elongated hole being elongated in an extending direction, at least one moving seat that is adapted to be co-movably connected to a movable impact member of the nail gun, and at least one resilient member that interconnects the at least one stationary seat and the at least one moving seat, and that has at least one first end coil extending through the at least one stationary elongated hole and being movable parallel to the extending direction along the at least one stationary elongated hole.

Abstract: A pneumatic ratchet wrench includes a main body formed with a receiving chamber, a head unit, a driving unit and an air motor. The head unit defines a gas passage, and includes a ring portion and a frame portion. The ring portion includes an exit in spatial communication with the gas passage and opens toward the frame portion. The driving unit includes a driving head, and a transmission shaft mounted in the head unit. The air motor drives the transmission shaft and includes a cylinder and a rotor. The cylinder includes a venting hole allowing gas produced in the cylinder to pass through the venting hole and the gas passage and to exit from the exit to be blown toward the frame portion.

Abstract: A belt sander having a fast-lift cover structure includes a drive mechanism, a body and a cover. The drive mechanism includes a drive module, a tension arm, a sanding belt surrounding the drive module and the tension arm. The body receives the drive module. The body includes a base, an extendable support rod extended from the body and connected to the tension arm, and a cover fastening assembly disposed at the base. The cover fastening assembly includes a release and a resilient element for restoring the release to its original position. One end of a cover is pivotally connected at one side of the body, and the other end of the cover includes a fastening portion engaged with the release. Operation is easy, no hand tools are required, and the cover does not fall off.

Abstract: A nail gun includes a gun body, a muzzle unit, a nail-feeding unit, a nail-striking unit, and a control unit for controlling the nail-feeding unit and the nail-striking unit to implement a method for feeding nails. The method includes the following steps: energizing a nail-striking solenoid valve of the nail-striking unit to perform a nail-striking operation on one of the nails; de-energizing the nail-striking solenoid valve, and simultaneously starting to count a predetermined delay time period in idle; and upon elapse of the predetermined delay time period, energizing a nail-feeding solenoid valve of the nail-feeding unit to perform a nail-feeding operation on another one of the nails.

Abstract: An impact device is adapted to be mounted to an electric nail gun that includes a flywheel, and includes a swing arm unit, a track unit and an impact unit. The swing arm unit is adapted to be pivoted toward or away from the flywheel. The track unit includes a guiding track movably connected to the swing arm unit. The impact unit is connected to the guiding track, and is movable relative to the guiding track in a striking direction and a return direction that are opposite to each other. The guiding track is movable resiliently relative to the swing arm unit between a front position, where the impact unit is adapted to contact the flywheel, and a rear position, where the impact unit is adapted to be spaced apart from the flywheel.

Abstract: A nail gun includes a power module, a magazine module and a detection module. The power module performs a nail-driving operation by receiving a first pressure, and is prevented from receiving the first pressure when the power module is subjected to a second pressure. The detection module includes a valve rod and a detection member operable to pivot between an unsealing position and a sealing position. The detection member is moved to the sealing position when the number of the nails in the magazine module is less than a predetermined amount.

Abstract: An electric nail gun includes a nail-striking subunit that is adapted to strike a nail, a lifting wheel that is movable to become engageable and not engageable with the nail-striking subunit, a driving member that is rotatable by a motor, and a transmission shaft that is movably connected between the driving member and the lifting wheel, and that is convertible between a first position, where the lifting wheel is engageable with the nail-striking subunit such that rotation of the driving member results in movement of the nail-striking subunit, and a second position, where the lifting wheel is not engageable with the nail-striking subunit such that rotation of the driving member does not result in movement of the nail-striking subunit.

Abstract: A pneumatic electric nail gun includes a muzzle unit, a striking cylinder that is connected to the muzzle unit, a piston rod subunit that extends movably from the striking cylinder into the muzzle unit, an electric unit that drives movement of the piston rod subunit from a standby position to a nail-striking position for striking a nail, and a connecting unit that includes a plurality of fasteners and a plurality of buffer members. The fasteners extend through the electric unit and secure the electric unit to the muzzle unit. Each of the buffer members surrounds a respective one of the fasteners and fills a space between the respective one of the fasteners, the electric unit and the muzzle unit for shock absorption during a nail-striking process.

Abstract: A heat dissipating device is adapted to be mounted in an electric nail gun that includes a flywheel being rotatable about an axis, a first pulley being spaced apart from the flywheel, and a transmission belt being trained on the first pulley. The heat dissipating device includes a second pulley, a weight disc and a heat dissipating member that are adapted to be connected coaxially and co-rotatably to the flywheel. The second pulley is adapted to be trained by the transmission belt. The heat dissipating member includes a plurality of fan blades extending in a direction of the axis such that, during co-rotation of the flywheel, the weight disc and the heat dissipating member, the fan blades create a flow of air for cooling.

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.