Down pressure system with free float extension

A - Human Necessities – 01 – B

Patent

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Details

A01B 5/06 (2006.01) A01C 5/06 (2006.01) A01C 7/20 (2006.01)

Patent

CA 2199050

An opener for use in varying ground conditions, ranging from no-till to conventional full tillage conditions, includes an adjustable down pressure control and a down pressure spring and tension link assembly which selectively provide a limited free float opener condition or a conventional down pressure spring controlled bias condition. A sleeve slidably received by the opener arm and mounted over the lower portion of the tension link assembly allows the opener to free float in loose soil conditions so that only the weight of the opener provides downward bias when the down pressure control is adjusted to a minimum condition. The opener is free to ride up and down to follow irregularities in the ground surface. In harder soil conditions such as those encountered in no-till farming methods, the down pressure control is adjusted to a position wherein an enlarged portion on the sleeve bottoms against the opener arm and the spring begins to compress so that the opener operates in the conventional spring biased mode. The sleeve allows increased downward movement of the opener to follow depressions in the soil.

Cette invention concerne un ouvreur de sillon adapté à des conditions de sol variables, allant de sols non labourés aux sols travaillés à fond. Il comprend une commande réglable de pression d'enfoncement et un mécanisme d'enfoncement à ressort et tendeur qui autorisent un planage libre limité ou un travail classique en profondeur contrôlé par ressort d'enfoncement. Un manchon monté en ajustement libre sur le bras de l'ouvreur de sillon et s'étendant jusqu'à couvrir la partie inférieure du tendeur permet à l'outil objet de l'invention de planer librement en sols meubles de telle sorte que le seul poids de l'ouvreur détermine la profondeur de creusage, le réglage de pression d'enfoncement étant au minimum. L'ouvreur peut alors suivre les ondulations du sol. En sol plus dur comme ceux rencontrés en cultures sans labour, la commande de pression d'enfoncement est réglée à une position où une partie élargie du manchon prend appui sur le bras de l'ouvreur et le ressort commence à appuyer sur l'ouvreur selon le mode classique. Le manchon permet un mouvement vertical de plus grande amplitude pour suivre les dépressions dans le sol.

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