Earth working – Tool – standard or connection – Spring biased or formed tool or tool part
Patent
1999-04-30
2000-10-31
Will, Thomas B.
Earth working
Tool, standard or connection
Spring biased or formed tool or tool part
172720, 172765, A01B 2300
Patent
active
061387711
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a tine for mounting on a soil-working implement, and which is intended to work the soil and make it ready for subsequent seeding.
There are many different types of soil-working implements which are used in agriculture, including ploughs, harrows (including power harrows), cultivators and packers, such implements being used singly for some operations, and in other circumstances being used in multi-working operations in a single pass when incorporated as integrated combinations. Examples of integrated combinations include reversible plough/packer combinations e.g. as disclosed in WO95/02315.
It is of course well known to mount soil-working tines on agricultural implements, and which usually are used to further work partly worked soil e.g. after ploughing. It is also known to mount tines on direct drilling implements. The tines project downwardly of their mountings on the frame of the implement and into the soil, and by being pulled forwardly through the ground exert a working action on the soil which breaks-down the soil e.g. into smaller soil clods and lumps, as part of the preparations to make the soil ready for seeding. Subsequent working of the soil may be necessary by use of packers, either as separate operations, or by incorporating packers into integrated harrow/packer combinations.
Tines are usually made of spring steel, and the inherent resilience of a tine allows it to be pulled through the ground to carry out a working operation, and if particularly resistant ground conditions are encountered e.g. hard-baked clay, buried stones, or large clods, the tine is able to deflect under load so as to minimise risk of damage. The ability of the tine to yield temporarily also stores-up additional spring energy in the tine which also assists in the working operation in difficult conditions.
The inherent resilience of a tine is achieved partly by rigid securement of the upper end of the tine, and which projects downwardly from its mounting in cantilever manner, and which allows resilient deformation of the downwardly projecting portion of the tine and the tine end in any direction. If additional resilience is required i.e. to permit further resilient yielding of the tine end (and also further temporary storage of spring energy), the upper end of the tine may include spring coils, or other energy storage devices.
One particularly challenging set of soil-working conditions for a tine applies when working the harder and tougher soils having a large proportion of clay present. During dry conditions, the presence of clay in the soil results in the formation of large lumps during working e.g. following ploughing, and which are hard to break-down during subsequent working by tines. By contrast, during moist or wet conditions, following ploughing, the soil hardly breaks-down at all into separate lumps.
The traditional way of working"difficult" soil conditions i.e. having a large proportion of clay present, has been to carry out initial working of the soil by ploughing in the autumn, and then to let the winter weather act on the ploughed ground to carry out initial breaking-down of the ploughed soil. Thus, the action of rain and frost over the winter period can cause a partial breaking-down of the ploughed ground, and subsequent working of the ground in the spring with a harrow can then make the soil ready for seeding. Often, it is necessary for up to six separate harrowing operations to make the soil ready for seeding, and evidently substantial labour, fuel and equipment costs are involved in this traditional method. It is also weather dependent, in that not only must there be suitable weather prevailing for autumn ploughing, but also for the subsequent harrowing in the spring.
It is also common practice, prior to harrowing, to use heavy rollers, with massive cylinders or packer rings, to try to crush or break-down some of the lumps of soil. Power harrows also may be used, although this requires a higher consumption of power and time.
However, despite the difficulties of working with these ha
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Kverneland Klepp AS
Mammen Nathan
Will Thomas B.
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