Patent ID: 8272924

Claim:
A grinding head for a floor surface grinding machine, comprising: a tool holder configured as a disc shaped plate, which in use is moved by the grinding machine in a plane, the tool holder being adapted to connect at least two grinding tools thereto; and at least two grinding tools which are connectable to the tool; wherein the tool holder comprises permanent magnets and the at least two grinding tools comprise magnetic or magnetizable material to cooperate with the permanent magnets on the tool holder in order to connect the at least two grinding tools to the tool holder, wherein the tool holder is provided with at least two pins for each grinding tool and the grinding tools are provided with complementary cavities which extend transverse to said plane of movement of the tool holder to prevent movement of the grinding tools with respect to the tool holder in a direction parallel to said plane when the grinding tools are connected to the tool holder, wherein the tool holder has a surface facing the at least two grinding tools when connected thereto, wherein the tool holder comprises a recess for each magnet, and wherein the magnets are provided inside corresponding recesses such that a tool facing surface of the magnets lies recessed with respect to said tool facing surface of the tool holder.