Patent ID: 7195423

Claim:
A wheeled concrete working device movable over a surface of uncured concrete and operable to establish a desired grade of the uncured concrete surface, said wheeled concrete working device comprising: 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; a plow assembly mounted 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, said wheeled concrete working device being operable in response to a signal from a laser receiver mounted at said plow assembly to adjust an elevation of said plow member to establish a desired grade of the concrete when said wheeled support is moved in said rearward direction; and a controller for automatically controlling the elevation of said plow member in response to a direction signal indicative of the direction of travel of said wheeled support, said controller 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 being at least one of stopping and moving in said forward direction.