Patent ID: 9272383
Filing Date: 2016-03-01
CPC Classification: A47L,B24B

Claim Text:
1. A surface preparation apparatus comprising: a motor powered wheeled vehicle; a grinding head assembly movable with the wheeled vehicle for grinding material from a surface over which the wheeled vehicle travels, wherein the grinding head assembly will oscillate laterally relative to the direction of travel of the vehicle; and a lifting mechanism powered by the vehicle motor for applying an upward force to the grinding head, so that the downward force applied to the surface resulting from the weight of the grinding head can be adjusted as the vehicle travels over the surface, wherein the lifting mechanism comprises a pair of hydraulic cylinders mounted at one end to the vehicle and at a second end to a grinding head connection structure and wherein the hydraulic cylinders are operable to adjust the weight applied by the grinding head assembly to the surface from a maximum weight of the grinding head assembly to zero.