HAND-HELD AND HAND-GUIDED RANDOM ORBITAL POLISHING OR SANDING POWER TOOL

摘要

The invention refers to a hand-held and hand-guided random orbital polishing or sanding power tool (1). The tool (1) comprises a static body (31), a motor (15), an eccentric element (17) driven by the motor (15) and performing a rotational movement about a first rotational axis (10), and a plate-like backing pad (9) connected to the eccentric element (17) in a manner freely rotatable about a second rotational axis (16). The first and second rotational axes (10, 16) extend essentially parallel to one another and are spaced apart from one another. In order to provide for a power tool (1) particularly quiet and low in vibrations, it is suggested that at least part of an external circumferential surface of the eccentric element (17) has an at least discrete rotational symmetry in respect to the first rotational axis (10); the power tool (1) comprises at least one first bearing (30) provided between the rotationally symmetric part of the external circumferential surface of the eccentric element (17) and the static body (31) of the power tool (1) so that the eccentric element (17) is guided in respect to the body (31) in a manner rotatable about the first rotational axis (10); and the power tool (1) comprises a mechanical gear arrangement (21) with at least two meshing gear wheels (27, 28, 29,29.1, 29.2), wherein the gear arrangement (21) is provided functionally between a driving shaft (18) driven by the motor (15) and the eccentric element (17) and wherein at least one of the gear wheels (27) is attached to the eccentric element (17) in a manner adapted for transmitting torque to the eccentric element (17).