Importance

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Abstract

A self-propelled, dual motor, variable width riding trowel for finishing a concrete surface. The riding trowel comprises a frame mounting a seat for an operator and controls accessible by the operator for steering and controlling the trowel. Adjustable subframe blocks mount a pair of motors, each driving a bladed rotor for frictionally contacting the concrete surface and supporting the frame. Displaceable gearboxes, pivotally mounted to the subframe, transfer rotation from each motor to its rotor. The motors are interlinked by an extensible driveshaft extending between the gearboxes that synchronizes the rotors. Lever arms disposed beneath the frame tilt the gearboxes and rotors in response to the controls for steering the trowel. An extensible guard cage, mounted to the frame, prevents inadvertent contact between the rotors and foreign objects. The trowel may be expanded to receive finishing pans on the blades of the rotors. Expansion of the trowel requires displacement of several components. Each motor and gearbox is mounted to a sliding block mated to frame rails which slidably couple the blocks to the frame. The controls comprise a replaceable torque shaft having a length dependent on the distance between the axes of the rotor-gearbox assemblies.

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First Claim