An adjustable stroke mechanism for a random orbital machine including a housing having a wall enclosing a cavity, an adjuster ring surrounding the housing and having a first set of gear teeth along a first portion of an inner surface, and a second set of gear teeth along a second portion of the inner surface, a counterweight having gear teeth on an exterior surface disposed within the housing, and a bearing carriage having gear teeth disposed within the housing. At least one counterweight gear that meshes with the gear teeth of the counterweight and the first set of gear teeth of the adjuster ring, and at least one bearing carriage gear that meshes with the gear teeth of the bearing carriage and the second set of gear teeth of the adjuster ring, so that movement of the adjuster ring causes movement of both the counterweight and the bearing carriage.

An adjustable stroke mechanism for a random orbital machine including a housing having a wall enclosing a cavity, an adjuster ring surrounding the housing and having a first set of gear teeth along a first portion of an inner surface, and a second set of gear teeth along a second portion of the inner surface, a counterweight having gear teeth on an exterior surface disposed within the housing, and a bearing carriage having gear teeth disposed within the housing. At least one counterweight gear that meshes with the gear teeth of the counterweight and the first set of gear teeth of the adjuster ring, and at least one bearing carriage gear that meshes with the gear teeth of the bearing carriage and the second set of gear teeth of the adjuster ring, so that movement of the adjuster ring causes movement of both the counterweight and the bearing carriage.

The present invention provides, in one aspect, a rotating power tool including a housing, a drive unit within the housing having an electric motor defining a rotational axis, and a drive shaft coupled to the electric motor to receive torque therefrom configured to rotate about the rotational axis, the drive shaft having an eccentric portion. The drive unit further includes an accessory tool configured to orbit about the rotational axis in response to rotation of the eccentric portion of the drive shaft, the accessory tool defining a rotational imbalance. The rotating power tool further includes a dynamic mass balancing system including an actively adjustable counterbalance mass to attenuate vibration caused by the rotational imbalance.

The present invention provides, in one aspect, a rotating power tool including a housing, a drive unit within the housing having an electric motor defining a rotational axis, and a drive shaft coupled to the electric motor to receive torque therefrom configured to rotate about the rotational axis, the drive shaft having an eccentric portion. The drive unit further includes an accessory tool configured to orbit about the rotational axis in response to rotation of the eccentric portion of the drive shaft, the accessory tool defining a rotational imbalance. The rotating power tool further includes a dynamic mass balancing system including an actively adjustable counterbalance mass to attenuate vibration caused by the rotational imbalance.

A random orbital sanding tool includes a power motor, a driving spindle connected to the power motor, an eccentric block connected to the driving spindle, a tool holder disposed on the eccentric block, and a sanding pad connected to the tool holder and indirectly driven by the power motor. The random orbital sanding tool includes a friction member disposed on the eccentric block, the friction member contacts the sanding pad. The friction member has a first state of providing a pre-pressure to the sanding pad when the power motor is not activated, a second state of displacing with the eccentric block and deforming with revolving of the sanding pad when the power motor is activated, and a third state of providing a braking force to the sanding pad when the power motor stops running.

A random orbital sanding tool includes a power motor, a driving spindle connected to the power motor, an eccentric block connected to the driving spindle, a tool holder disposed on the eccentric block, and a sanding pad connected to the tool holder and indirectly driven by the power motor. The random orbital sanding tool includes a friction member disposed on the eccentric block, the friction member contacts the sanding pad. The friction member has a first state of providing a pre-pressure to the sanding pad when the power motor is not activated, a second state of displacing with the eccentric block and deforming with revolving of the sanding pad when the power motor is activated, and a third state of providing a braking force to the sanding pad when the power motor stops running.

An abrasive-means holding device for holding an abrasive means includes a holding body that is operable to rotate about a central axis. The holding body has a first side, a second side facing away from the first side, and a vacuuming opening that extends therethrough from the first side to the second side. The holding body also has a group of aspiration cavities that are arranged on the first side and that are fluidically connected to each other by at least one through-hole that connects the aspiration cavities. At least one aspiration cavity forms a vacuuming cavity that is directly fluidically connected to the vacuuming opening and that is configured to vacuum-off dust immediately out of an adjacent aspiration cavity and mediately out of a more distantly adjacent aspiration cavity. The aspiration cavities of the group are arranged in relation to each other along a linear course.

The invention relates to a power tool (10) comprising a mechanical device (50) for setting a working parameter of said power tool (10) via a potentiometer (56) that is adjustable via the mechanical device for setting the working parameter, the power tool (10) further comprising a printed circuit board (44) and an illumination device (64), in particular an LED (70), with electrical contacts (72), the illumination device (64) being adapted for illuminating the mechanical device (50) for setting the working parameter. The electrical contacts (72) of the illumination device (64) are indirectly connected to the printed circuit board (44) via flexible wires (74).

The invention relates to a power tool (10) comprising a mechanical device (50) for setting a working parameter of said power tool (10) via a potentiometer (56) that is adjustable via the mechanical device for setting the working parameter, the power tool (10) further comprising a printed circuit board (44) and an illumination device (64), in particular an LED (70), with electrical contacts (72), the illumination device (64) being adapted for illuminating the mechanical device (50) for setting the working parameter. The electrical contacts (72) of the illumination device (64) are indirectly connected to the printed circuit board (44) via flexible wires (74).

An orbital sander includes a housing, a motor within housing, the motor including a motor shaft defining a motor axis, an eccentric drive unit coupled to the motor shaft to convert rotation of the motor shaft to an orbit motion around the motor axis, a battery receptacle for receiving a battery pack, a backing pad coupled to the eccentric drive unit for orbital motion about the motor axis, and a dust collection assembly adjacent the backing pad for directing dust away from the backing pad. The orbital sander, including the housing, the motor, the eccentric drive unit, the battery receptacle, the backing pad, and the dust collection assembly, defines a center of gravity CG.sub.ROS located on a first side of the motor axis adjacent the battery receptacle. The dust collection assembly defines a center of gravity CG.sub.DCA on a second side of the motor axis opposite the first side.