초록 ▼

A turnable self-propelled, walk-along tractor vehicle, such as a plow for burying tubing is provided. The tractor vehicle has a pair of drive wheels rotatably mounted on a fixed axle in the front of the vehicle, a back support means, a U-shaped turning bracket mounted to the sides of the tractor veh

A turnable self-propelled, walk-along tractor vehicle, such as a plow for burying tubing is provided. The tractor vehicle has a pair of drive wheels rotatably mounted on a fixed axle in the front of the vehicle, a back support means, a U-shaped turning bracket mounted to the sides of the tractor vehicle, and optionally a vibrating blade for cutting a trench in the earth coupled at the rear of the vehicle. The back support means is mounted to the tractor vehicle at a first position elevated with respect to the ground and is adapted to engage the ground at a second position when downward force is applied to the turning bracket. The turning bracket comprises first and second portions, which may be flat or tubular in shape, which extend rearwardly from the sides of the tractor vehicle and substantially horizontally with respect to the ground when the back support means is in the first position. A third portion, which also may be flat or tubular in shape, extends perpendicular to and has juncture lines with the first and second portions. The lengths of the first and second portions are such that, by applying downward force to the third portion, the center of gravity of the tractor vehicle is shifted to lift the drive wheels from engagement with the earth and enable the vehicle to pivot on the back support means against the ground to effect a turn. In another embodiment, the tractor is equipped with pivot wheels to assist in turning the plow.

대표청구항 ▼

[ What is claimed is:] [1.]1. In a self-propelled tractor vehicle with two wheels having a handle at an upper portion of the rear of the vehicle, an engine in the front of the vehicle, and said two wheels located in the front of the vehicle on a fixed motorized axle driven by the engine, the improve

[ What is claimed is:] [1.]1. In a self-propelled tractor vehicle with two wheels having a handle at an upper portion of the rear of the vehicle, an engine in the front of the vehicle, and said two wheels located in the front of the vehicle on a fixed motorized axle driven by the engine, the improvement comprising:(a) a back support means fixed with respect to the vehicle and disposed behind and adjacent to the two wheels and mounted to a lower portion of the vehicle at a location above the lower most level of the wheels for allowing the vehicle to pivot backwards and supporting the vehicle when in contact with the ground; and(b) a fixed, stationary U-shaped turning bracket, separate from the handle, and mounted to the sides of the tractor vehicle adjacent to the ground above the level of said fixed axle and below the level of the handle, said bracket comprising first, second, and third portions, said first and second portions extending substantially horizontally with respect to the ground when the two wheels engage the ground, said third portion having juncture lines with said first and second portions at a location to the rear of the two wheels, and located between the handle and the back support means, wherein the length of the first and second portions are such that by applying downward force to the third portion, the center of gravity of the vehicle is shifted to lift the two wheels from engagement with the ground and enable the vehicle to pivot on the back support means against the ground to effect a turn of the vehicle.