Patent ID: 7854565
Filing Date: 2010-12-21
Classification: E01C

Abstract:
1. A method of establishing a desired grade of an uncured concrete surface, said method comprising: providing a wheeled concrete working device having a wheeled support having a frame portion and a pair of wheels rotatably mounted at said frame portion, said wheeled support being selectively movable in a forward direction and a rearward direction; mounting a plow assembly to said frame portion, said plow assembly including at least one plow member for engaging the concrete when said wheeled support is moved in said rearward direction; adjusting an elevation of said plow member in response to a signal from a laser receiver mounted at said plow assembly to establish a desired grade of the concrete when said wheeled support is moved in said rearward direction; and controlling the elevation of said plow member in response to a direction signal indicative of the direction of travel of said wheeled support, and wherein controlling the elevation of said plow member comprises controlling the elevation of said plow member irrespective of said signal from said laser receiver when said direction signal is indicative of said wheeled support at least one of stopping and moving in said forward direction.