초록 ▼

A high performance, hydraulically-propelled, multiple rotor riding trowel for finishing concrete is controlled with hydraulic circuitry enabling steering wheel and foot pedal control. The rigid trowel frame preferably mounts three separate spaced-apart, downwardly-projecting, bladed rotor assemblies

A high performance, hydraulically-propelled, multiple rotor riding trowel for finishing concrete is controlled with hydraulic circuitry enabling steering wheel and foot pedal control. The rigid trowel frame preferably mounts three separate spaced-apart, downwardly-projecting, bladed rotor assemblies that frictionally engage the concrete surface. The rear rotor assemblies are tilted with double acting, hydraulic cylinders to effectuate steering and control in response to foot pedals. Double acting hydraulic cylinders also control blade pitch. Separate gimbaled, hydraulic motors revolve each rotor assembly. A steering wheel controlling a front, hydraulic steering control valve controls the front tilting cylinder to facilitates steering with minimal physical exertion.

대표청구항 ▼

[ What is claimed is:] [1.] A motorized riding trowel for finishing concrete, said riding trowel comprising:a rigid, generally triangular frame having a front and a rear;seat means disposed on said frame for supporting a driver;a pair of spaced-apart, rear rotors gimbaled to said frame rear, wherein

[ What is claimed is:] [1.] A motorized riding trowel for finishing concrete, said riding trowel comprising:a rigid, generally triangular frame having a front and a rear;seat means disposed on said frame for supporting a driver;a pair of spaced-apart, rear rotors gimbaled to said frame rear, wherein the axes of rotation of said rear rotors establish a biaxial plane, and wherein said rear rotors tilt in a plane coincident with or parallel to said biaxial plane;a front rotor gimbaled to said frame front, wherein the front rotor tilts in a plane perpendicular to said biaxial plane;wherein the front and rear rotors each comprises a plurality of radially spaced-apart blades for frictionally contacting the concrete surface;a separate hydraulic motor for powering each rotor;tilting cylinder means for selectively tilting said rotors for steering and maneuvering the trowel;internal combustion motor means for powering the trowel;hydraulic tilting circuit means for controlling said tilting cylinder means;hydraulic drive circuit means for controlling each hydraulic motor;hydraulic pump means driven by said internal combustion motor means for powering said hydraulic drive circuit means and said hydraulic tilting circuit means;driver-operated means for operating said hydraulic tilting circuit means, whereby the driver can steer and control the trowel hydraulically, said driver-operated means for operating said hydraulic tilting circuit means comprises steering wheel means accessible to the driver of said trowel for remotely activating said hydraulic tilting cylinders from a seated position and foot-operated pedal means accessible to the driver of said trowel for remotely activating said hydraulic tilting cylinders from a seated position and,wherein said steering wheel means controls the hydraulic steering control valve associated with said rotor that tilts perpendicularly to said biaxial plane, and said foot-operated pedal means controls the hydraulic steering control valves associated with said rotors that tilt within or parallel to said biaxial plane.