A - Human Necessities – 01 – B
Patent
A - Human Necessities
01
B
A01B 63/111 (2006.01) A01B 63/11 (2006.01) A01C 7/00 (2006.01) A01C 7/20 (2006.01)
Patent
CA 2144564
A hydraulic downpressure system for use on no-tillage seeders allows for a constant downward force to be applied on seeding tools operating in highly variable soil surface conditions in order to keep a uniform seeding or planting depth. Raising and lowering of the seeding units can also be achieved with this hydraulic system. A double acting hydraulic cylinder is principally used having its rod end connected to one or two seeding units. A hydraulically operated two-way mode selection valve provides system shifting between both modes involved. The first mode- is used when transporting the seeder on roads and to operate the seeding tools in the field. Control is then provided by a three-way directional valve mounted to an external hydraulic power supply, such as an agricultural tractor. Raising and lowering of the seeding tools can be achieved when operating in this mode. A second mode is involved when the seeding tools are working into the ground to sow seeds. Pressure applied on both ports of the hydraulic cylinder comes from a nitrogen accumulator that acts as a pressure absorber which results in a net downward force. The cylinder can thus move independently while always maintaining the same force. A second three-way directional valve regulates the pressure in the accumulator and protects system from overload pressure. Downpressure adjustment is directly dependent from this control valve. A pressure compensator prevents a differential of pressure during system mode changes. The force from one cylinder can be applied on two seeding units using a double linkage system.
Janelle Luc
Lague Claude
Tessier Sylvio
Janelle Luc
Lague Claude
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
St-Agritech
Tessier Sylvio
LandOfFree
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