Planting – Drilling – Lister units
Patent
1981-06-03
1983-08-16
Burr, Edgar S.
Planting
Drilling
Lister units
111 88, A01C 506
Patent
active
043984789
ABSTRACT:
An apparatus that includes a frame supported pair of rotatably mounted furrow forming disks, a seed tube extending between the disks for depositing seed in a furrow, a pair of individually mounted and frame supported gauge wheel structures, each structure including a support pivotally mounted on said frame, a wheel located generally adjacent an outer surface of a disk and rotatably mounted on the support, adjustment structure for moving the supports and thus said wheels to vary furrow depth, and a furrow closing and seed soil contact assembly, said assembly including arm structure pivotally mounted on said frame and extending rearwardly to rotatably support furrow closing and seed soil contact structure rearward of the disks and a spring connected to the frame above the arm structure pivot and to the arm structure below and forward of the pivot, the spring biasing the furrow closing and seed soil contact structure downwardly with the same increase of force on the soil with the same increase in furrow depth for uniform seed soil pressure.
REFERENCES:
patent: 1020681 (1912-03-01), Binns, Jr.
patent: 1901298 (1933-03-01), Johnson
patent: 1901299 (1933-03-01), Johnson
patent: 4009668 (1977-03-01), Brass et al.
patent: 4273057 (1981-06-01), Pollard
Frase Roland J.
Robinson, Jr. Edward L.
AuBuchon F. David
Burr Edgar S.
International Harvester Co.
Sullivan Dennis K.
Wiecking David A.
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