Power tool
OwnerAndreas Peisert, Wolfgang Kofink +2inventors
InventorsAndreas Peisert, Wolfgang Kofink, Michael Nothofer, Manfred Ludwig
Life of this patent
Estimating the term…
Abstract
A power tool has a drive mechanism with an output shaft which performs an intermittent rotary motion. The output shaft drives, via an overrunning clutch, a tool drive shaft to drive a tool, which thus performs a quasi-continuous rotary motion that, as the load on the machine increases, transitions increasingly into a discontinuous rotary motion. The power tool can advantageously be used as a hand-held power tool for screwing, drilling, sawing, sanding, and the like, a high output torque with a low reaction torque being achievable as a result of the intermittent drive mechanism.
Claims36
A power tool comprising
- a housing;
- a drive mechanism with an output shaft having a longitudinal axis, said output shaft performing a rotary motion oscillating back and forth about its longitudinal axis;
- a tool drive shaft for driving a tool;
- at least a first overrunning clutch having an engagement direction for transmitting torque and an idle direction, said first overrunning clutch being coupled to the output shaft and to the tool drive shaft for converting the oscillating rotary motion of the output shaft into an intermittent rotary motion of the tool drive shaft in one working rotation direction;
- and
- a damping device engaging the tool drive shaft and the housing for damping a reverse rotation of the tool drive shaft opposite to the working rotation direction.
A power tool comprising
- a housing;
- a motor;
- an oscillation drive mechanism, driven by the motor, in order to convert a rotary motion of the motor into a back-and-forth oscillating rotary motion of an output shaft;
- a tool drive shaft for driving a tool;
- a first overrunning clutch having an engagement direction for transmitting torque and an idle direction, said first overrunning clutch being provided between the output shaft and the tool drive shaft for converting the oscillating rotary motion of the output shaft into an intermittent rotary motion of the tool drive shaft in one working rotation direction;
- a a second overrunning clutch provided between the tool drive shaft and the housing for preventing a reverse rotation of the tool drive shaft opposite to the working rotation direction;
- a third overrunning clutch, having an engagement direction for transmitting torque and an idle direction and being provided between the output shaft and the tool drive shaft, said third overrunning clutch having an engagement direction which is opposite to the engagement direction of said first overrunning clutch;
- and
- a switching element for coupling the output shaft alternatively to the first or the third overrunning clutch in order to drive the tool drive shaft either clockwise or counterclockwise.
A power tool comprising:
- an oscillating rotary motion output shaft;
- a tool drive shaft for driving a tool;
- a first overrunning clutch having an engagement direction and an idle direction, said first overrunning clutch for converting the oscillating rotary motion of the output shaft into an intermittent rotary motion of the tool drive shaft in one working rotation direction;
- and
- a damping device for damping a reverse rotation of the tool drive shaft opposite the working rotation direction.
Dependencies are inferred from the claim text.