Patent ID: 7137875
Filing Date: 2006-11-21
Classification: B24B

Abstract:
1. Grinding head for a mobile grinding machine for grinding stone floors, which grinding machine comprises a body carrying a drive motor, a planet disc mounted in the body and a multiplicity of grinding heads mounted on the planet disc, where the planet disc can be rotated by means of the motor about a substantially vertical rotational axis and the grinding heads can be rotated relative to the planet disc around substantially vertical planet axes which are distributed around the rotation axis, wherein the grinding head concerned comprises a carrier that is designed to be rotated by means of the motor and a grinding disc that is designed to be driven by the carrier by means of a coupling element established between the carrier and the grinding disc, which coupling element comprises a multiplicity of plates stacked on each other and each with a central opening and at least four drain holes distributed around this, and a compression spring which extends through the central opening of the plates and by means of screw elements is clamped between the carrier and the grinding disc, which screw elements extend through the drain holes of the plates and are arranged to connect alternately, in a circular direction around the central opening of the plates, the carrier with the plate nearest the grinding disc and the grinding disc with the plate nearest the carrier.