Tractor with three-point linkage connecting scraper thereto and automatic tilt control
First Claim
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1. 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.
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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).
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Citations
11 Claims
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1. A tractor comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification