Rotec Industries, Inc.

Charles J Arndt

Robert F Oury

Robert F Oory

A concrete finishing machine having a movable framework mounted transversely over a paved area and defining an axis. A carriage is movably attached to the framework and has means for moving the carriage along the length of the framework. The carriage carries at least one rotating auger unit having leading and trailing portions mounted on one shaft and a finishing member. The auger unit has a leading portion having a helically arranged blade with an outer edge that is positioned in a fixed, spaced relationship with a desired grade. The trailing portion has a helically arranged blade with a band attached thereto to spread forward the excess concrete left by the leading portion and to finish the concrete at the desired grade. Plunging concrete vibrators are placed adjacent the auger unit leading portions. Means for conveying concrete, aligned with the framework axis, is mounted on the framework and has a side discharge station, movably mounted on the conveyor, for directing concrete from the conveying means to the paving area along the framework length. The side discharge stations has a plow, discharge chute and operator platform to centrally control all machine operations. The framework has track engaging end sections for support. Adjustment means are mounted on the end sections to maintain a desired grade for the concrete finishing operations during skewed movement of the framework axis relative to an axis perpendicular to the direction of framework travel.

Concrete finishing machine

An over-the-road vehicle having a pivotally-mounted telescoping boom which moves in and out, up and down, and from side to side. An extensible concrete conveyor belt is mounted on the boom for movement with the boom for conveying and placing concrete within the reach of the boom. The vehicle is equipped with stabilizing outriggers which are pivotally mounted on the vehicle and can be folded back in nesting relation to minimize the width of the vehicle during transit. The vehicle also carries a separate belt conveyor for feeding concrete to the extensible conveyor, the discharge end of said separate conveyor being mounted on arms which fold down to reduce the overall height of the vehicle during transit.

Vehicle-mounted extensible conveyor

A load sensor for a concrete conveyor having a tremie which sounds a signal and releases the tremie in case the tremie becomes overloaded. The device has a U-shaped deflection yoke between the tremie and the conveyor which deflects under the weight of the tremie to close switches and actuate the appropriate safety device. All parts are protected from concrete to insure proper functioning.

Load sensor

A very large hopper capable of discharging concrete of varying consistency onto a moving belt conveyor in a smooth continuous ribbon. The hopper will handle concrete which is predominately mortar, up to concrete having aggregate comprising 4 to 6 inch mean diameter rocks. In a preferred embodiment the hopper has a flat inclined wall containing a discharge opening closed by a sliding primary gate with a 'W' shaped leading edge; the primary gate also having a discharge opening closed by a sliding secondary gate.

Growing community of inventors

Elk Grove Village, IL, United States of America

Charles J Arndt