Earth working – Scraper between widely spaced front and rear ground supports
Patent
1977-08-10
1979-04-24
Stouffer, Richard T.
Earth working
Scraper between widely spaced front and rear ground supports
172711, 172799, 180140, 280DIG9, E02F 376
Patent
active
041507266
ABSTRACT:
A land plane for leveling or grading the surface of a land area including a frame having front and rear wheel assemblies, a center section and two end sections. A plurality of grader blades are supported below the center section which in turn may be raised away from and lowered towards the ground surface by pivoting the end sections of the frame with respect to the center section. Adjustable braces correct warps and distortion in the frame and permit accurate setting of the alignment and angular disposition of the blades with respect to the ground surface. Steering of the plane is controlled through a fluid system which coordinates the steering actions of the front and rear wheel assemblies and, alternatively, permits the rear wheel assembly to be steered independent of the front wheel assembly.
REFERENCES:
patent: 1529941 (1925-03-01), Bradley
patent: 2195607 (1940-04-01), Wilson et al.
patent: 2310057 (1943-02-01), Boerma
patent: 2512979 (1950-06-01), Strother
patent: 2593880 (1952-04-01), Heavilin
patent: 3022587 (1962-02-01), Greeley
patent: 3081567 (1963-03-01), Saul
patent: 3090449 (1963-05-01), Ward
patent: 3446307 (1969-05-01), Logus
patent: 3856102 (1974-12-01), Queen
patent: 3910353 (1975-10-01), Ralston
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