Seed drill

Planting – Drilling – Lister units

Patent

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Details

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:
patent: 446978 (1891-02-01), Orr
patent: 465081 (1891-12-01), Wood
patent: 1386336 (1921-08-01), Hoftrup
patent: 2777379 (1957-01-01), Heath
patent: 3213947 (1965-10-01), MacKenzie
patent: 3490544 (1970-01-01), Godbersen
patent: 4037545 (1977-07-01), Dreyer
patent: 4244306 (1981-01-01), Peterson et al.
patent: 4417530 (1983-11-01), Kopecky
patent: 4493273 (1985-01-01), Ganchet et al.
patent: 4528920 (1985-07-01), Neumoyer
patent: 4532790 (1985-08-01), Nicholls
patent: 4694759 (1987-09-01), Dreyer et al.

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