A hand-held tool has a tool holder for holding a striking tool on a working axis, an electric motor, and a striking mechanism. The striking mechanism has an exciter piston moved by the motor, a striker coupled to the exciter piston by a pneumatic chamber arranged between the exciter piston and the striker, and a ram arranged in the striking direction of the striker piston. In a working position the ram rests counter to the striking direction against a stop. A stationary shut-off valve has a valve seat and an elastic shut-off member, wherein the elastic shut-off member in a relaxed state has a basic form which lifts from the valve seat, and wherein in the working position the elastic shut-off member is forced by the ram into a tensioned form resting against the valve seat.

A hand-held machine tool including a tool holder for a striking tool has a motor, an impact mechanism, a spool valve, and a pneumatic chamber. The impact mechanism has an exciter piston moved by the motor, and a hammer coupled to the exciter piston via a pneumatic chamber arranged between the exciter piston and the hammer, and a striker arranged in front of the hammer in the striking direction. In a working position counter to the striking direction, the striker bears on a stop, in a starting position the striker is offset in the striking direction relative to the working position, and in a rest position the striker is offset in the striking direction relative to the starting position. In the starting position, the hammer bearing on the striker closes the spool valve and, in the rest position, the hammer bearing on the striker opens the spool valve.

A hammer tool for hammering on a workpiece by a tool bit moving at least linearly in a longitudinal direction of the tool bit, configured so that a hammering element moves toward the tool bit to hits the tool bit by way of air pressure fluctuation in an air chamber when a driving element is moved from a first position to a second position. In addition, the stroke center position of the reciprocating movement of the driving element moved between the first position and the second position is configured to be changeable.

An orthopedic impacting tool comprises a motor, an energy storage chamber, a striker, and an anvil. The motor stores energy in the energy storage chamber and then releases it, causing the striker to apply a controlled force on an adapter to create a precise impact for use in a surgical setting. The tool may further comprise a combination anvil and adapter. The tool further allows forward or backward impacting for expanding the size or volume of the opening or for facilitating removal of a broach, implant, or other surgical implement from the opening. An energy adjustment control of the tool allows a surgeon to increase or decrease the impact energy. A light source and hand grips improve ease of operation of the tool.

An orthopedic impacting tool comprises a motor, an energy storage chamber, a striker, and an anvil. The motor stores energy in the energy storage chamber and then releases it, causing the striker to apply a controlled force on an adapter to create a precise impact for use in a surgical setting. The tool may further comprise a combination anvil and adapter. The tool further allows forward or backward impacting for expanding the size or volume of the opening or for facilitating removal of a broach, implant, or other surgical implement from the opening. An energy adjustment control of the tool allows a surgeon to increase or decrease the impact energy. A light source and hand grips improve ease of operation of the tool.

Percussion unit, especially for a rotary hammer and/or percussion hammer, comprising a control unit which is designed for open-loop and/or closed loop control of a pneumatic percussion mechanism, and at least one operating condition sensor unit. According to the disclosure, the control unit is designed to detect at least one percussion mechanism parameter depending on measurement values of the operating condition sensor unit.

A hand-held power tool is disclosed. The tool has a tool receptacle for holding a chiseling tool. A pneumatic percussion mechanism of the hand-held power tool includes a striker, an exciter and a guide tube. The striker is designed to apply impacts in the impact direction to the tool. The exciter is motor-driven. The striker is coupled by an air spring to the reciprocating movement of the exciter. The striker abutting the guide tube is guided along a working axis. During a movement between an impact position and the exciter, the striker is guided with a constant guide length on the guide tube and if the impact position is exceeded in the impact direction, the guide length is reduced. The hand-held power tool is equipped with an inclined guide, which inclines the striker relative to the working axis when the impact position is exceeded.

An electric power tool includes a housing, a motor, an output shaft, an acceleration sensor, and a twisted-motion detector. The housing is configured to house the motor and the output shaft. The acceleration sensor is configured to detect acceleration of the housing. The twisted-motion detector is configured to repeatedly obtain acceleration of the housing in the circumferential direction of the output shaft, to calculate a speed by integrating, of the obtained accelerations, accelerations obtained in a certain period, and to detect twisting of the housing from the speed.

An electric power tool of one aspect of the present disclosure includes a housing, a motor, an output shaft, a first power transmission, a second power transmission, a common sensor, a twisted-motion detector, and a vibration-based load detector. The common sensor detects a motion of the housing and outputs a detection signal indicating the detected motion. The twisted-motion detector detects a twisted-motion of the housing in a circumferential direction of the output shaft based on the detection signal. The vibration-based load detector detects a vibration of the housing in an axial direction of the output shaft based on the detection signal and detects a load on the output shaft based on the detected vibration.

It is an object of the invention to provide an impact tool having a rational mechanism in an idling state. According to the representative invention, in an idling state defined as a state in which a tool accessory 119 is not pressed against a workpiece and an impact bolt 145 transmits a striking force to the tool accessory 119, the tool accessory retainer 510 moves with respect to a tool accessory holder 117 by movement of the tool accessory 119 in the longitudinal direction, so that the striking force is cushioned.