| 摘要 |
The invention relates to a self-propelled grinding or milling machine for finishing a surface of concrete or similar hard material, eg a floor.
<??>The machine, which consists of a frame carried on a number of wheels in which a rotating grinding or milling tool with a vertical shaft is suspended and loaded with weights so that the pressure of the wheels on the surface is maintained at a constant level at varying working pressures of the tool, is arranged to tilt laterally by means of a raising and lowering device which acts on the non-steerable wheels so that the pressure of the tool on the floor differs on the right-hand and left-hand side and so gives rise to frictional forces which cause the machine to move forward and rearward respectively at a speed which is dependent on the magnitude of tilt.
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