A - Human Necessities – 01 – B
Patent
A - Human Necessities
01
B
A01B 63/10 (2006.01)
Patent
CA 2292270
The invention relates to a lifting device for the lower steering arms of a tractor. Per lower steering arm 2, 3 there are provided a position recording device 25 which generates a position signal representing the pivot position of said lower steering arms 2, 3, and a piston-cylinder unit 11, 12 which acts on the tractor and on the lower steering arm 2, 3. Per piston-cylinder unit 11, 12 there is provided a switching circuit which comprises a directional valve 33, 33' with four ports and four switching positions, and in the first postion of said directional valve 33, 33' all ports are blocked, in whose second position the cylinder chamber at the piston end is connected to the pressure agent supply source and the cylinder chamber at the piston rod end is connected to the return line, and in whose third position the cylinder chamber at the piston rod end is connected to the pressure agent supply source and the cylinder chamber at the piston end is connected to the return line and in whose fourth position both cylinder chambers are connected to the return line. A switching unit 28, 28' is provided with a guiding value F which corresponds to the nominal position of the lower steering arm 2, 3, and with a position signal which originates from the position recording device 25, 25' and represents the respective position of the lower steering arm. A comparator compares the guiding value F, with the position signal. The switching unit 28, 28', as a function of the result of the comparison, causes the directional valve 33, 33' to occupy one of the four positions.
Gkn Walterscheid Gmbh
Ridout & Maybee Llp
LandOfFree
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