A fastener driver includes a main housing, a drive blade movable from a retracted position to a driven position for driving a fastener into a workpiece, and a gas spring mechanism for driving the drive blade from the retracted position to the driven position. The gas spring mechanism includes a piston movable between a retracted position and a driven position. The fastener driver also includes an extensible cylinder for moving the drive blade from the driven position toward the retracted position. The extensible cylinder includes a cylinder housing coupled one of the main housing or the drive blade, and a rod coupled to the other of the main housing or the drive blade. A vacuum is created in the cylinder housing for biasing the drive blade toward the retracted position.

A powered fastener driver includes a driver blade and a drive unit having an output shaft for providing torque to move the driver blade from the bottom-dead-center position toward the top-dead-center position. A rotary lifter is engageable with the driver blade and configured to receive torque from the output shaft of the drive unit in a first rotational direction for returning the driver blade from the bottom-dead-center position toward the top-dead-center position. A kickout arrangement is defined between the lifter and the output shaft and configured to permit limited movement of the lifter relative to the output shaft between a first position and a second position. The kickout arrangement having a curvilinear slot defined in the rotary lifter in which a portion of the output shaft is received. Movement of the rotary lifter from the first position toward the second position causes the slot to move relative to the output shaft, while the output shaft remains within the slot.

A gas spring-powered fastener driver includes a cylinder, a moveable piston positioned within the cylinder, and a driver blade attached to the piston and moveable therewith from a retracted position to a driven position to drive a fastener into a workpiece. A fill valve is coupled to the cylinder and operable to selectively fill the cylinder with gas to a pressure.

A fastening tool having a latch mechanism that performs a tool-free jam release of a jammed fastener in the nosepiece. The latch mechanism includes a latch plate that is secured to the nose portion of a nosepiece assembly by a latch member and is pivotably releasable from the nose portion by a user's fingers.

A power tool includes an air spring cylinder. A piston is movably positioned within the cylinder and a driver blade and a rack are attached to the piston. The power tool includes a lifter gear including a lifter gear wheel portion, and a plurality of teeth extending radially from the lifter gear wheel portion and configured to engage the rack. A hub includes a first end operably connected to a motor output and a second end including a hub wheel portion. A first receptacle is provided in one of the lifter gear and the hub and a first bearing element extends from the other of the lifter gear and the hub into the first receptacle. A first elastomeric damper is positioned within the first receptacle between the first bearing element and a bearing element defined portion of the first receptacle.

A fastener driver includes a housing, a cylinder supported by the housing, and a moveable piston positioned within the cylinder. A driver blade is attached to the piston and movable therewith between a top-dead-center position and a driven or bottom-dead-center position. The driver blade includes a body having a first side and an opposite, second side with the driving axis passing therebetween, a plurality of teeth extending from the first side of the body, and a plurality of projections extending from the second side of the body. The body and the projections are bisected by a common plane. The teeth extend at an oblique angle from the first side of the body relative to the common plane.

A driving tool includes a first piston slidably disposed within a cylinder chamber and having an elongated driving part configured to drive a struck material. A second piston is configured to generate compressed air within the combustion chamber. A compressed air supply passage enables communication between the compression chamber and the cylinder chamber. A valve member opens and closes the compressed air supply passage. A relay member mechanically connects an electric motor with the valve member. The valve member opens and closes the compressed air supply passage via the relay member.

A drive-in tool for driving fasteners into a workpiece, wherein the tool comprises in particular: a safety device (8) which is coupled with the trigger element (6) and is set up to bring about a transfer of the drive-in tool (1) from a trip-ready state (100) into a secured state (101) after expiry (820) of a delay time which proceeds from an activation (810) of the safety device (8), wherein the safety device (8) comprises a control volume (15), wherein the safety device (8) comprises an activation element (33) which is changeable between a first and a second position by way of the trigger element (6), wherein in the first position of the activation element (33) a first pneumatic connection is defined between the control volume (15) and the gas pressure source connection (23), which is hereafter referred to as charging connection (27.1), and wherein in the second position of the activation element (33) a second pneumatic connection is defined between the control volume (15) and a pressure sink (40), which is hereafter referred to as discharging connection (33.1), wherein one connection from the charging connection (27.1) and the discharging connection (33.1) comprises a smallest cross-sectional flow area which, together with a gas pressure of the gas pressure source, determines the delay time of the safety device (8). The present disclosure also relates to a corresponding method for operating a drive-in tool.

A power tool includes a motor having a motor shaft that rotates about a motor axis in a first rotational direction. The power tool also includes a fan assembly attachable to the motor shaft for rotation in the first rotational direction. The fan assembly includes a fan body, a bearing having a race that rotates with the fan body, and a flywheel rotatably affixed to the fan body. The race is freely rotatable relative to the motor shaft in the first rotational direction, and fixed against rotation relative to the motor shaft in a second rotational direction opposite the first rotational direction. The flywheel has a central portion that defines a central bore, and the race is received into the central bore and rotatably affixed to the flywheel.

A driving mechanism for fastener driving machine, including a rotatable crank; a driving rack element rotatably installed on the crank, which comprises an engaging element, a support element and a driving rack; at least one fixed guide element. The support element and/or engaging element can move along the set trajectory. The present invention has a simple structure, a few parts and stable operation. When the crank rotates, the motion trajectory of the engaging element is straight or approximately O°, so as to reduce the kinetic friction force of load to the maximum extent, preventing wear problem, and guaranteeing constant direction of thrust on the impact unit in the course of compressed energy storage and low eccentric load in late stage, the quick release of driving mechanism is implemented, the operational stability and smoothness of impact unit are guaranteed, the work quality is upgraded.