Allen Engineering Corporation

Thomas J Leyes

J Dewayne Allen

Ralph C Luebke

An automatic grading control device for finishing plastic concrete controls several different elongated, multi-section concrete finishing tools such as vibratory screeds or the like, with or without forms. Supporting skis facilitate sliding, winch driven movement of the device relative to the plastic concrete. Spaced apart and vertically upwardly extending towers are supported by the skis and disposed periodically along the length of the finishing tool. Each tower comprises a pair of elongated, spaced apart stanchions disposed on opposite sides of the tool that are braced with a rigid, adjustable upper strut. The strut extends between the stanchions and forms the top of the tower. Movable sleeves coaxially fitted to the stanchions are synchronized by rigid transverse bridges that extend between the sleeves above the tool. Hydraulic or pneumatic cylinders extending between the strut and the bridge raise and lower the tool thereby controlling level. The cylinders are controlled by a beacon laser and attendant sensors secured to the device. A control panel controls both the cylinders and winches. The winches move the device along the plastic concrete by spooling cables secured to a fixed point.

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Oakville, Canada

Thomas J Leyes