Depth control for ground working agricultural implements

A - Human Necessities – 01 – B

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111/21

A01B 63/111 (2006.01) A01B 63/22 (2006.01) A01D 33/14 (2006.01)

Patent

CA 1076887

ABSTRACT OF THE DISCLOSURE A depth control device is attached to agricultural implements such as cultivators, seed drills, discers and the like, in order to control, within pre-determined limits, the depth of penetration of the earth working components. It com- prises firstly a ground or surface engaging sensing member ex- tending forwardly of the framework and secondly, a sensor that is connected to the earth working components. Both of these sensors are connected to the means to raise and lower the earth working components which controls the depth of penetra- tion thereof so that, for example, if uneven ground is encoun- tered, the depth penetration is corrected and if the density changes of the ground being worked, thus affecting the suction, then once again depth penetration is corrected. Means are provided to average out the effect of conditions changing the depth of penetration so that the desired average depth of pene- tration is maintained particularly in relatively wide machines. Switches are actuated by the sensors and these switches are connected to solenoids or solenoid valves which in turn operate the raising and lowering mechanism for the earth working com- ponents, said mechanism being operated either by hydraulic rams or reversible electric or hydrostatic motors.

291981

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