Patent ID: 7325881
Filing Date: 2008-02-05
Classification: E01C

Abstract:
1. A method of grinding a series of depressions in a surface, comprising the steps of: providing an hydraulic grinding assembly mounted on a surface mounting portion having front and rear ground support elements mounted on said surface mounting portion and supporting said surface mounting portion at a uniform height, wherein said grinding assembly comprises a grinding drum with opposing ends horizontally and vertically aligned within a cover, wherein said cover is pivotally mounted to said surface mounting portion, wherein said raising and lowering said grinding assembly comprises pivotally raising and lowering said cover to correspondingly raise and lower said grinding drum while maintaining said grinding drum ends in horizontal and vertical alignment; advancing a gauge wheel in a forward direction of travel along the surface to be ground wherein said gauge wheel is forward of said grinding assembly; and, hydraulically raising and lowering said grinding assembly relative to said surface mounting portion and said front and rear ground support elements in response to rotation of the gauge wheel.