Tractor with three-point linkage connecting scraper thereto and automatic tilt control
AssigneeKubota Corporation
InventorsShigekazu Hasegawa, Naoki Okita, Satoshi Machida
Life of this patent
Estimating the term…
Abstract
A seated-operator type tractor has a vehicle proper (1), equipped rearwardly thereof with a link mechanism (6) and a scraper (9) for ground-leveling. The vehicle (1) is further provided with: a position-controlling mechanism (34) for controlling up-and-down position of the scraper (9); an automatic control mechanism for maintaining the scraper (9) in its left-and-right horizontal posture, by a sensor (50) therefor; a controlling valve (24) for controlling blade-angle adjustment of the scraper (9); and a manual switch (47) disposed near at hand of the seated operator, for shifting over the vehicle (24).
Claims11
A tractor comprising:
- a tractor body;
- a scraper;
- a three-point linkage means for connecting said scraper to said tractor body, said linkage means including a top central link means and left and right lower link means;
- a pair of lift arm means connected to said left and right lower link means, a hydraulic operated cylinder connected to said lift arm means for raising and lowering said scraper;
- a position controlling mechanism, a hand lever operatively connected thereto, said controlling mechanism being adapted to control said hydraulic operated cylinder to raise and lower said scraper to a position corresponding to a position selected by said hand lever and which automatically retains said scraper in said position;
- a first hydraulic actuator included in one of said pair of lift arm means for rolling adjustment of said scraper;
- a sensor for detecting right and left slant postures of said scraper, said sensor generating a tilt detection signal;
- and
- an automatic control mechanism responsive to said tilt detection signal for actuating said first hydraulic actuator for automatically correcting the slant posture of said scraper.
Dependencies are inferred from the claim text.