Earth working – Automatic power control – Land leveller type
Patent
1989-03-07
1990-03-20
Reese, Randolph A.
Earth working
Automatic power control
Land leveller type
172444, 172 2, A01B 6311
Patent
active
049093312
ABSTRACT:
The hitch gear comprises a three point lift system. It comprises a system (10) for load transfer by means of a hydraulic cylinder (11) at the third point and at least adjustment wheel (13) provided with a load sensor (19) suitable to act with control means of the cylinder (11) for keeping the load at the level of the adjustment wheel (13) approximately constant. The lift system comprises at least one hydraulic cylinder (27); a control device (28) of the position of the lift system, known per se, is provided and comprises at least an attachment means (29) for a reference position and appreciable control means at the fixed position suitable for supplying the hydraulic cylinder (27). A hydraulic distribution system (44) is provided between the cylinder at the third point (11) and the cylinder (27) and is connected in such a way that when the cylinder at the third point (11) acts in a direction which causes an increase in the load carried by the tractor, said distribution system ( 44) allows the creation of a raising of the level of the lifting device and, inversely, a lowering.
REFERENCES:
patent: 2755721 (1956-07-01), Rusconi
patent: 2924285 (1960-02-01), Shame et al.
patent: 3198547 (1965-08-01), Annat
patent: 3517943 (1970-06-01), Bunting et al.
patent: 4044838 (1977-08-01), Wooldridge
patent: 4508178 (1985-04-01), Cowell et al.
patent: 4529039 (1985-07-01), Sakundiak
patent: 4535847 (1985-08-01), Hasegawa et al.
Reese Randolph A.
Thompson Jeffrey L.
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