Patent ID: 11969850
Assignee: nan
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A power tool, including a hand-held and hand-guided random orbital polishing or sanding power tool, comprising:
a static body, a motor, an eccentric element driven by the motor and performing a rotational movement about a first rotational axis, and a plate-like backing pad connected to the eccentric element in a manner freely rotatable about a second rotational axis, first and second rotational axes extending substantially parallel to one another and being spaced apart from one another,
at least part of an external circumferential surface of the eccentric element having an at least discrete rotational symmetry in respect to the first rotational axis so as to form a rotationally symmetric part of the eccentric element;
the power tool having at least one first bearing provided between the rotationally symmetric part of the external circumferential surface of the eccentric element and the static body of the power tool so that the eccentric element is guided in respect to the static body in a manner rotatable about the first rotational axis; and
the power tool having a mechanical gear arrangement with at least two meshing gear wheels, the mechanical gear arrangement being provided functionally between a driving shaft driven by the motor and the eccentric element, and at least one of the at least two meshing gear wheels being attached to the eccentric element in a manner adapted for transmitting torque to the eccentric element;
wherein
the mechanical gear arrangement is designed as a planetary gear arrangement having a sun gear wheel, a ring gear wheel and a plurality of planetary gear wheels meshing the sun gear wheel and the ring gear wheel, the plurality of planetary gear wheels being attached to the eccentric element in a freely rotatable manner; and
the sun gear wheel is attached to the driving shaft in a torque proof manner or forms an integral part of the driving shaft, and the ring gear wheel forms an integral part of the static body of the power tool.