Earth working – Alternating for right or left hand operation – Tool shifted for opposite throw
Patent
1996-04-01
1998-04-21
Melius, Terry Lee
Earth working
Alternating for right or left hand operation
Tool shifted for opposite throw
172162, 172218, A01B 328
Patent
active
057408688
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a pressure control circuit for a combination of a reversible plough with a plurality of soil preparation devices coupled therewith, in which each device is adapted to be trailed behind the plough via a pivotable coupling which defines a substantially horizontal swivel axis extending generally parallel to the direction of travel.
In particular, the invention has been developed in connection with a reversible plough / multiple soil preparation device combination, in which a number of separate devices are mounted at suitable mounting points on movable parts of a frame of a reversible plough. Preferably, the soil preparation devices comprise "packers".
BACKGROUND OF THE INVENTION
As is well known, a reversible plough usually comprises a headstock (by which the plough is attached to the lifting arms at the rear of a tractor), a carrying beam, and a set of pairs of reversible plough bodies mounted at positions spaced apart along the length of the beam, and which can be reversed in order that the plough body of each pair which happens to be in a lowered ploughing position can be rotated through about 180.degree. so as to be in an uppermost inoperative position, and the previously uppermost ploughing body can then be brought to the lowered ploughing position.
When packers are mounted individually on movable parts of a frame of a reversible plough, this may be carried out using swivel coupling and as disclosed in, for example, the Packomat brochure of Kverneland Klepp published May 1993, or as shown in more detail in Swedish patent application No 920074-2 and European patent application No 93103829.3 (publication No 0560319A).
The a swivel coupling which is used to couple a packer to a movable packer arm (or other movable part of the frame of a reversible plough) serves to form a towing connection which allows the packer to be towed behind the plough, but which also allows the packer to be raised from the ground and to maintain a substantially horizontal attitude while the packer is adjusted from a soil working position at one side of the plough, to a soil working position at the other side of the plough, when plough body reversal takes place.
During normal operation, the mass of the packer acts via its packer rings to break-up the soil turned-over previously by the plough bodies, and so as to make the ground ready for seeding.
In existing designs of packer, the weight of the packer is borne partly by the engagement of the packer rings with the ground (to support the rear end of the packer), and also by the swivel coupling of the packer to the plough frame, which supports the front end of the packer.
It is known to provide a height control adjustment which is manually operated, and which can serve to adjust the height of each packer relative to the swivel coupling and thereby adjust the downward pressure exerted by the packer on the ground. However, once the adjustment has been set for each packer, the combination of reversible plough (which may comprise more than one plough section) and a set of multiple packers coupled therewith is a rigid assembly, and which is not able to adjust itself to compensate for undulations, bumps and troughs in the ground surface which is being ploughed and packed.
Thus, if, for example, one packer of the set engages a hump in the ground, (or is travelling over a ground surface which is higher relative to the ground ahead of the packer which is currently being ploughed), this will cause the packer to move upwardly relative to the plough frame and therefore, via the swivel coupling, the entire plough frame is liable to follow at least part of the upward movement of the packer.
This is disadvantageous for two reasons: first of all it may lift at least some of the plough bodies by an undesired amount so that non-uniform ploughing is carried out by the plough bodies i.e. some plough bodies will be ploughing to an undesirably shallower depth than the other plough bodies; and secondly the other packers also will tend to be lifted via the p
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Batson Victor
Kverneland Klepp AS
Melius Terry Lee
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