A powered fastener driver includes a magazine containing fasteners therein, a drive blade movable in a reciprocating manner to discharge a fastener from the magazine for each drive cycle of the drive blade, a first trigger operable to initiate a drive cycle of the drive blade, and a second trigger movable between a first position, in which the first trigger is inhibited from moving to initiate the drive cycle, and a second position, in which the first trigger is movable to initiate the drive cycle.

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.

A mechanical timer mechanism can include a driven gear mounted to a rotary damper and a drive gear operably coupled to the driven gear. In bump mode, movement of an auxiliary trigger to its actuating position can initially move the drive gear from a home position into its wind-up position. Thereafter, a contact trip can continue to move the drive gear to its wind-up position and an actuator of a principal trigger to its actuating position each time the contact trip is actuated, unless the timing mechanism has timed-out between actuations. In sequential mode, the drive gear can be moved into a timer lock-out position which holds the contact trip in a bypass position in which the contact trip will not engage the actuator of the auxiliary trigger unless the auxiliary trigger is moved to its actuating position before actuation of the contact trip.

A driving tool with a mechanical spring uses urging force from a striking spring as driving force and switches its operation mode. The tool includes a striking driver to strike a fastener, a striking spring urging the driver in a driving direction, a contact arm movable to a retracted position in a counter-driving direction in response to pressing against a workpiece, a trigger movable to an on-position in response to user operation, and a mode selector switch to switch the operation mode between continuous drive mode and single drive mode. A driving operation is performed in the continuous drive mode in response to the contact arm moving to the retracted position and the trigger moving to the on-position in any order, and in the single drive mode in response to the contact arm moving to the retracted position and the trigger moving to the on-position in the stated order.

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

An electric nail gun includes a muzzle seat, a safety component being movable relative to the muzzle seat, and a cylinder unit connected to the muzzle seat and including a striking cylinder, at least one storage chamber that is adapted for storing pressurized air, and a sealing cap that is coupled to the striking cylinder and the at least one storage chamber. The electric nail gun further includes an air valve disposed in the cylinder unit and being directly and solely movable by the safety component from a closed position to an open position to allow the pressurized air to flow into the striking cylinder, and a nail-striking unit driven movably by the pressurized air for striking a nail when the air valve is at the open position.

A pneumatic tool includes a drive part configured to be driven by compressed air, a control valve configured to switch the presence or absence of operation of the drive part, an on-off valve part configured to switch the presence or absence of operation of the control valve, and a timer part configured to control the operation of the on-off valve part and switch the presence or absence of operation of the control valve after a lapse of a predetermined time. The timer part comprises a timer piston configured to move in one direction, and a timer piston cylinder configured to support the timer piston. The pneumatic tool comprises a throttle part configured to throttle the flow rate of air flowing into or flowing out from the timer piston cylinder, and an adjustment part configured to adjust an operating time of the timer piston.

A powered fastener driver includes a first cylinder, a first piston positioned within the first cylinder, a second cylinder in fluid communication with the first cylinder, and a second piston positioned within the second cylinder. The first piston is moveable between a top-dead-center position and at or near a bottom-dead-center position and the second piston is moveable between a top-dead-center position and a bottom-dead-center position to initiate a fastener driving cycle. A drive blade is coupled to the second piston for movement therewith and a drive mechanism is configured to drive the first piston between the top-dead-center position and at or near the bottom-dead-center position. The drive mechanism includes a crank arm that rotates less than 360 degrees for moving the first piston from at or near the bottom-dead-center position and the top-dead-center position and then back to at or near the bottom-dead-center position to complete the fastener driving cycle.

A driver including: an ejection part to which a fastener is supplied; a driver blade which moves from a first position toward a second position and drives the fastener into a driven member; and a rack provided to the driver blade. The driver further includes: a rotary component engaging with the rack and moving the driver blade from the second position to the first position; and a lock plate engaging with the rack. The driver blade moves from the second position to the first position while the rotary component rotates once, the rotary component is released from engaging with the rack after the driver blade moves from the second position to the first position, and moves from the first position to the second position, and the lock plate is engageable with the rack when the driver blade stops before reaching the second position from the first position.

A dustproof device for use in an electric nail gun includes a dustproof plate and two fastening members. The electric nail gun includes a muzzle unit used for discharging nails and a machine body unit connected to the muzzle unit and operable to strike the nails. The dustproof plate has a mounting surface facing the machine body unit, an exterior surface that is opposite to the mounting surface and prevents foreign matters from entering the machine body unit, and a through hole that extends through the mounting surface and the exterior surface, that permits the muzzle unit to extend fittingly therethrough, and that is complementary in shape with a contour of a cross section of the muzzle unit. The two fastening members extend from the mounting surface and are detachably connected to the machine body unit to secure the dustproof plate between the machine body unit and the muzzle unit.