A driver capable of suppressing an increase in a load of a bumper is provided. The driver 10 includes a striking portion 12 provided movably and configured to move to strike a fastener; a bumper 33 configured to be in contact with the striking portion 12 to restrict a range of movement of the striking portion 12; and a housing 11 configured to support the bumper 33, the driver 10 further including a load suppressing portion configured to suppress an increase in a load of the bumper 33 based on the load of the bumper 33 detected by a load detection portion or number of operations of the striking portion within a predetermined time.

A gas-spring type driving tool with a charge valve, a relief valve, and an opening valve provided in an accumulation chamber. Compressed gas can be quickly charged into the accumulation chamber by connecting the charge valve to an external device. The relief valve maintains the accumulation chamber at a preset pressure. The opening valve is capable of opening the accumulation chamber quickly to the atmosphere. This allows for a quick removal of a jammed nail from a driving nose.

A rotary shaft is spline coupled to a carrier of a final-stage planetary gear mechanism. A bearing for supporting the rotary shaft is arranged on an outer circumferential side of the carrier. The bearing and the carrier are arranged so as to overlap in a direction perpendicular to a motor axis.

A driving tool includes a piston, a driver, and a lift mechanism. The piston moves in a driving direction by a pressure of a gas. The driver extends from the piston and includes a plurality of engaged portions. The lift mechanism moves the driver in a direction opposite to the driving direction. The lift mechanism includes a rotation shaft, a wheel, a plurality of engaging portions, and a supporting member. The wheel rotates integrally with the rotation shaft. Each of the plurality of engaging portions may engage an engaged portion. The supporting member supports the wheel so the wheel is allowed to move between an initial position and an eccentric position in a radial direction of the rotation shaft.

A driving tool comprises a cylinder extending in an up-down direction and a piston that moves downward within the cylinder due to a compressed gas to drive a driving member. The driving tool further comprises a main body housing that houses the cylinder and a grip extending rearward from a rear surface of the main body housing. The driving tool further comprises an upper chamber that is provided above the cylinder and communicates with the cylinder. The driving tool further comprises an air chamber that extends downward from the upper chamber and that extends only in an area on a right or left side of the main body housing with respect to both an axis center of the cylinder and an axis center of the grip.

A driver includes: a pressure chamber and a striking portion actuated in a direction of striking a fastener when compressed gas is supplied to the pressure chamber, and can select a single firing and a continuous firing; a switching mechanism having a first actuated state to actuate the striking portion in the direction when the single firing is selected and a second actuated state to block the striking portion from being actuated in the direction when the continuous firing is selected; and a control unit configured to switch the switching mechanism from the first actuated state to the second actuated state when a predetermined time elapses in a state where the continuous firing is selected and the switching mechanism is in the first actuated state. The control unit stops the power supply to the switching mechanism for at least part of a period of time when the predetermined time elapses.

A driver includes: a pressure chamber and a striking portion actuated in a direction of striking a fastener when compressed gas is supplied to the pressure chamber, and can select a single firing and a continuous firing; a switching mechanism having a first actuated state to actuate the striking portion in the direction when the single firing is selected and a second actuated state to block the striking portion from being actuated in the direction when the continuous firing is selected; and a control unit configured to switch the switching mechanism from the first actuated state to the second actuated state when a predetermined time elapses in a state where the continuous firing is selected and the switching mechanism is in the first actuated state. The control unit stops the power supply to the switching mechanism for at least part of a period of time when the predetermined time elapses.

A gas spring-powered fastener driver includes a cylinder, a moveable piston, a driver blade attached to the piston, the driver blade movable with the piston, a lifter including a rotary component operably coupled to the driver blade to move the driver blade from a driven position to a ready position, and a multi-stage planetary transmission. The transmission includes an output shaft operatively coupled to the lifter to provide torque thereto, a first bearing supporting a first portion of the output shaft for rotation, a second bearing supporting a second portion of the output shaft for rotation. The fastener driver also includes a housing having a cylinder support portion in which the cylinder is received and a transmission housing portion in which the first and second bearings are received to rotatably support the output shaft. The cylinder support portion and the transmission housing portion are integrally formed as a single piece.

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.

A gas spring-powered fastener driver includes a cylinder, a storage chamber cylinder having pressurized air in communication with the cylinder, a moveable piston positioned within the cylinder, a driver blade extending from a first side of the piston and movable therewith between a top-dead-center position and a bottom-dead-center position, a one-way seal carried onboard the piston and disposed between the piston and the cylinder, the one-way seal being configured permit a bypass flow of pressurized air from the first side of the piston, past the one-way seal, and into a space within the cylinder adjacent an opposite, second side of the piston during movement of the piston and driver blade from the top-dead-center position to the bottom-dead-center position, thereby increasing a pressure of the pressurized air within the cylinder and storage chamber cylinder, and a pressure relief valve in fluid communication with the storage chamber cylinder.