초록 ▼

A high performance, three engine, three rotor riding trowel for finishing concrete. A rigid, generally triangular frame mounts three downwardly projecting, bladed rotors that frictionally engage the concrete surface therebelow. The rotors on opposite sides of the operator (i.e., to the left or right

A high performance, three engine, three rotor riding trowel for finishing concrete. A rigid, generally triangular frame mounts three downwardly projecting, bladed rotors that frictionally engage the concrete surface therebelow. The rotors on opposite sides of the operator (i.e., to the left or right) rotate in opposite directions, and they are tilted in coincident pivot planes that are parallel with the frame rear. The front rotor is titled in a plane that is perpendicular to the pivoting plane of the other two rotors. Tilting of the rotors with double acting hydraulic cylinders effectuates steering of the apparatus. Joy sticks enable the operator to hand control the trowel with minimal physical exertion. A unique hydraulic powered linkage generates steering forces by tilting the rotors in response to electrical signals. The gearboxes are interchangeable and mounted to tiltable, steering boxes secured to the frame. Each rotor establishes a generally vertical axis of rotation. Several equidistantly spaced blades extend radially outward from each rotor. The blades contact plastic concrete to finish the surface while supporting the trowel.

대표청구항 ▼

[ What is claimed is:] [1.] A motorized riding trowel for finishing a concrete surface, said riding trowel comprising:a rigid, generally triangular frame having two rear vertices and a spaced apart front vertice;a front rotor assembly and a pair of spaced apart rear rotor assemblies for powering sai

[ What is claimed is:] [1.] A motorized riding trowel for finishing a concrete surface, said riding trowel comprising:a rigid, generally triangular frame having two rear vertices and a spaced apart front vertice;a front rotor assembly and a pair of spaced apart rear rotor assemblies for powering said riding trowel and frictionally contacting said concrete, the rear rotor assemblies mounted upon said rear vertices and said front rotor assembly mounted upon said front vertice, each rotor assembly comprising a single pivot axis, wherein the plane of the pivot axis of each rear rotor assembly is coplanar with one another and perpendicular to the concrete surface, and the plane of rotation of the front rotor assembly is perpendicular both to the plane of rotation of the rear rotor assemblies and said concrete surface.