Planting – Drilling – Lister units
Patent
1985-07-02
1988-07-26
Feyrer, James R.
Planting
Drilling
Lister units
111 86, 172709, 172710, 172776, A01C 506
Patent
active
047593016
ABSTRACT:
A seed drill which will allow seed to be planted at a substantially constant depth regardless of contours and irregularities in the ground surface. The said drill has a tyne pivotally mounted on a frame for angular movement about a substantially horizontal axis transverse to the direction of travel. The lower end of the tyne being adapted to support a ground engaging tool with a seeding boot located rearwardly of the tool whereby the tool is arranged to form a furrow in the ground for seed discharging from the seeding boot. A spring biassing means acts between the tyne and frame for urging the tool into engagement with the ground. The spring biassing means is arranged to exert a biassing force on the tyne for counteracting the resistive force exerted on the tool as the tool traverses the soil whereby to maintain the tool at a substantially constant working depth in the soil.
REFERENCES:
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patent: 4528920 (1985-07-01), Neumoyer
patent: 4532790 (1985-08-01), Nicholls
patent: 4694759 (1987-09-01), Dreyer et al.
Feyrer James R.
Thomas John David
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