Earth working – Scraper between front and rear ground supports of vehicle – Push frame for scrapers
Patent
1988-10-06
1990-06-05
Thompson, Jeffrey L.
Earth working
Scraper between front and rear ground supports of vehicle
Push frame for scrapers
172817, 172821, 172798, E02F 376
Patent
active
049305824
ABSTRACT:
A grader attachment is a forward extending triangular truss structure, which extends from a point of pivotal attachment to a tractor to a tandem front wheel support. A blade frame pivotally hangs from the peak of the truss, supporting a cutter blade immediately beneath the truss. The blade frame is capable of both lateral rotation an tilt. Blade positioning provides lateral forces for sliding the blade from side to side, and a rotational force for turning the blade so as to provide for a left or right leading edge cut. The blade describes, as it is moved, a cutting line tangent to a circle of large radius. The blade is supported through a long lever arm, increasing the stability of the blade position. The tractor raises and lowers the blade by tilting the entire truss. The apparatus is steered by the steering wheels of the tractor. An optional front wheel tilt mechanism aids in establishing a smooth curve cut, and may be implemented without the necessity of interconnecting the tractor steering with the grader attachment. The general lightweight of the structure, which permits it to be readily lifted above the line of the tractor, permits blade motion which a standard motor grader is incapable of.
REFERENCES:
patent: 1569011 (1926-01-01), Gilbert
patent: 2620203 (1952-12-01), Love
patent: 2698491 (1955-01-01), Felt
patent: 3027662 (1962-04-01), Cunningham, Jr.
patent: 3262715 (1966-07-01), Abbott
patent: 4246972 (1981-01-01), Halmosi et al.
patent: 4501334 (1985-02-01), Ptacek
patent: 4635730 (1987-01-01), Larsson
Norcross Alexander F.
Thompson Jeffrey L.
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