Floor treatment apparatus with tensioning pulley drive
A floor treatment apparatus includes a frame, a housing which is rotatable with respect to the frame according to a main axis, at least three head pulleys which are rotatable with respect to the housing according to respective head axes which are regularly spaced around, and which are parallel to, the main axis, a motor supported by the frame, a drive pulley which is drivable by the motor, a main belt tensioning pulley and a main belt which is slung around the drive pulley, the head pulleys and the main belt tensioning pulley. Further an auxiliary pulley is coaxially connected to the main belt tensioning pulley. A fixed pulley is connected to the frame. An auxiliary belt is slung around the auxiliary pulley and the fixed pulley for rotating the housing with respect to the frame.
1. A floor treatment apparatus, comprising:
a frame;
a housing which is rotatable with respect to the frame about a main axis;
at least three head pulleys which are rotatable with respect to the housing about respective head axes which are regularly spaced around, and which are parallel to, the main axis;
a motor supported by the frame;
a drive pulley which is drivable by the motor;
a main belt tensioning pulley;
a main belt extending around the drive pulley, the head pulleys and the main belt tensioning pulley;
an auxiliary pulley coaxially connected to the main belt tensioning pulley;
a fixed pulley connected to the frame; and
an auxiliary belt extending around the auxiliary pulley and the fixed pulley for rotating the housing with respect to the frame.
2. The floor treatment apparatus according to claim 1 , wherein the main belt extends around the drive pulley and the head pulleys in such a way that said head pulleys are in contact with one and the same side of said main belt and said head pulleys are drivable in the same rotational sense, and wherein the main belt tensioning pulley ( 15 ) is on an opposite side with respect to the one side of said main belt and is drivable in the rotational direction opposite to the rotational direction of the head pulleys.
3. The floor treatment apparatus according to claim 1 , wherein the auxiliary belt extends around the auxiliary pulley and the fixed pulley in such a way that the auxiliary pulley and the fixed pulley are on opposite sides of the auxiliary belt.
4. The floor treatment apparatus according to claim 3 , wherein the auxiliary belt extends around two idle pulleys which are on the same side of the auxiliary belt as the fixed pulley.
5. The floor treatment apparatus according to claim 4 , wherein at least one of the idle pulleys is an auxiliary belt tensioning pulley, the position of the auxiliary belt tensioning pulley being adjustable by means of an adjustment mechanism.
6. The floor treatment apparatus according to claim 5 , wherein the adjustment means of the auxiliary belt comprises a rack and pinion device.
7. The floor treatment apparatus according to claim 1 , wherein the housing comprises a base plate, and wherein the drive pulley, the head pulleys, the main belt tensioning pulley and the main belt are on one and the same side of said base plate.
8. The floor treatment apparatus according to claim 7 , wherein the fixed pulley, the auxiliary pulley and the auxiliary belt are above the top plate of the housing.
9. The floor treatment apparatus according to claim 1 , wherein the head pulleys are each provided with a head onto which one or more of polishing means and grinding means can be connected.