Abstract: A hitch assembly comprising a hitch bar 1 having a hitch 2 for attachment to a tractor at its leading end; a pair of drawbars 4,5, each having one end pivotally connected to the hitch bar 1 so as to be swingable in a substantially horizontal plane between a work position in which it extends laterally to the direction of travel, one on each side of the hitch bar, and with the outer end of one bar 5 extending rearwards further than the outer end of the other drawbar 4, and a transport position in which it trails rearwards of the work position; a support wheel 8,16 attached to the outer end of each drawbar 4,5; a hitch 10,18 on each drawbar for attachment to an implement, the hitch 18 on said one drawbar trailing behind that on said other drawbar in the work position; and a pair of stay-bars 23,24 each having one end pivotally connected to the hitch bar 1 so as to be swingable in a substantially horizontal plane between work and transport positions, each stay bar 23,24 in its work position being connectable by a

Abstract: A seed drill has a frame, a transverse hopper and a series of triple disc coulters mounted on the frame below the hopper. The coulters are each mounted on the frame by a parallelogram linkage which maintains the proper relative positions of the front and rear discs of the coulters at different penetration depths and permits the maximum transport height of the coulters.

Abstract: Seed drill has a row of coulters which are raised and lowered by a beam extending along and above the row of coulters and connected to the coulters by spring assemblies. The beam is raised and lowered relative to the frame of the drill by two rams to actuate the coulters. The mounting of the beam comprises an articulated joint, such as a ball joint, which permits the ends of the beam to rise and fall independently of each other relative to the frame thereby permitting improved contour following by the coulters and avoiding excessive loads on the beam in the event of failure of one of the rams.

Abstract: Seed drill has a row of coulters which are raised and lowered by a beam positioned above the coulters and connected to the coulters by spring assemblies. The beam is journalled for pivotal movement about its longitudinal axis and the spring assemblies are connected to the beam so that some exert reaction forces on the beam having clockwise moments about the beam's pivot axis, and others anticlockwise moments, whereby changes in loading of the coulters can be distributed between the coulters by angular movement of the beam about its pivot axis.