| 摘要 |
PCT No. PCT/GB95/01270 Sec. 371 Date Apr. 1, 1996 Sec. 102(e) Date Apr. 1, 1996 PCT Filed Jun. 1, 1995 PCT Pub. No. WO95/33364 PCT Pub. Date Dec. 14, 1995A combination of a reversible plough with a plurality of soil preparation devices including an improved height control system. The apparatus includes a headstock by means of which the combination can be mounted on lifting arms at the rear of a propelling vehicle. The soil preparation devices are each mounted on a movable part of a plough frame via a respective swivel coupling that allows the device to be towed and also to be suspended during plough body reversal. A common hydraulic pressure control circuit is provided to control the height of each soil preparation device relative to its respective swivel coupling, and to provide automatic self-compensating adjustment of each device as they follow the contour of the ground.
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