PURPOSE: To finish the ground horizontally with good accuracy in a short time by a scraper by maintaining the attitude of the scraper at a bilaterally horizontal attitude on the basis of the detection results of a sensor to detect the bilaterally inclined attitude of the scraper or a tractor.
CONSTITUTION: A link mechanism 6 for connecting working machine, which is vertically moved by a lift arm 3, is provided to the rear of a tractor 1, and a ground-grading scraper 9 connected to the link mechanism 6 is adjustably moved in a rolling manner by an oil-pressure actuator 7. The blade angle of the scraper 9 is adjusted by an oil-pressure actuator 7. A position control mechanism to automatically stop the lift arm 3, a sensor 50 to detect the bilaterally inclined attitude of the scraper 9 or a tractor 1, an automatic control mechanism to maintain the scraper 9 at a bilaterally horizontal attitude on the basis of the detection results of the sensor 50, and an operating means for controlling the actuator 4 are provided.
OKITA NAOKI
MACHIDA MASARU
| JPS54101120U | 1979-07-17 | |||
| JPS57129601A | 1982-08-11 |
| US3731746A | 1973-05-08 |
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