Classifications

• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
  • A01B49/00—Combined machines
  • A01B49/02—Combined machines with two or more soil-working tools of different kind
  • A01B49/022—Combined machines with two or more soil-working tools of different kind at least one tool being actively driven
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
  • A01B33/00—Tilling implements with rotary driven tools, e.g. in combination with fertiliser distributors or seeders, with grubbing chains, with sloping axles, with driven discs
  • A01B33/02—Tilling implements with rotary driven tools, e.g. in combination with fertiliser distributors or seeders, with grubbing chains, with sloping axles, with driven discs with tools on horizontal shaft transverse to direction of travel
  • A01B33/021—Tilling implements with rotary driven tools, e.g. in combination with fertiliser distributors or seeders, with grubbing chains, with sloping axles, with driven discs with tools on horizontal shaft transverse to direction of travel with rigid tools

Definitions

• the present invention relates to rotary cultivators and in particular, but not exclusively, to power driven rotary cultivators
• a rotary cultivator comprising rotatable soil- engaging rotor members which operate in a region of soil at least to some extent responsive to the presence of non-rotatable soil- engaging stator members so as in operation of the cultivator to produce a shearing effect on soil in said region. This shearing effect will take place in addition to the cultivation effects normally individually associated with the two sets of members and other cultivation mechanisms such as impact and compression may also be present.
• cultivators are already known which have, in common with the present invention, the feature of incorporating bpth soil-engaging rotor members and soil-engaging stator members in the one machine, these prior arrangements either involve remotely positioned stator tines presenting the rotor with loosened clods etc to be further broken up by the rotor or they use a rotor in which radial knives break up the soil by a slicing or cleaving action as opposed to a shearing action.
• the soil-breaking mechanism involves a relatively high power requirement as compared with the cultivators of the present invention and difficulties arise in accurately controlling the fineness of the tilth produced by the machine.
• the second members will rotate in the same sense as any landwheels present in the cultivator. Alternatively however they could rotate in the opposite sense.
• the rotor members will be power driven but it is envisaged that in some embodiments useful results may also be obtained by having these members land driven, e.g. driven by direct contact with the soil or by a conventional or other drive from a landwheel of the cultivator.
• the operative portions of the rotor members will enter the soil slightly behind the operative portions of the stator members.
• the rotor members comprise L-blades or spikes etc., e.g. of the sort conventional to existing rotary cultivators.
• the rotor members may comprise pick tines or serrated discs etc., e.g. of the sort conventional to existing disc harrows.
• stator members comprise tines of the sort conventional to existing rigid tine or spring tine cultivators for example.
• operative portions of the stators are inclined at between, say, 15° and 40° to the horizontal so that they lift the soil as they pass through it, an angle of around 20 being preferred.
• the rotor speed would he reduced from the 200 r.p. . (good soil) to 260 r.p.m. (bad soil) associated with current designs of rotary cultivator to 150 r.p.m. and 180 r.p.m. respectively, with a roughly proportionate saving in p.t.o. power.
• Figure 1 is a side view, partly broken away, of a first embodiment of the invention in which rotor members of pick tine form co-operate with spring tine stator members;
• Figure 2 is a plan view of the embodiment of Figure 1;
• Figure 3 is a side view, partly broken away, of a second embodiment of the invention in which the spring tine stator members of the first embodiment have been replaced by rigid tines; and
• Figures -4 to 4h show side and perspective views of alterna ⁇ tive designs of rotor and rotor members for use in the embodiments of Figures 1 and 2 or Figure 3.
• a rotary cultivator 10 according to the present invention comprises a frame 12 supported by trailing landwheels 14 and carrying a rotor 16 adapted to be power driven in the same rotational sense as the landwheel 14.
• the soil working members on the rotor 16 are provided by pick tines 18 which are arranged to enter the ground ' slightly behind a line of stator spring tines 20 also mounted on the frame 12. It will be observed that the operative portions of the stator tines are inclined at about 20 to the horizontal so as to provide a lifting effect on the soil as already described in general terms.
• the arrangement is completed by a three point linkage (not shown) for connecting the cultivator with the tractor (not shown) which is to pull the machine over the ground and which is to provide the p.t.o. for driving the ' rotor 16 as above described.
• the relative widths and spacings of the co-operating rotor and stator tines is an important practical detail of any cultivator constructed in accordance with the present invention.
• the total width of such a machine might be about 10 feet, say.
• Figure 3 differs from that of Figures 1 and 2 only in that rigid stator tines 24 have been used instead of spring tines 20 and with this exception the same numerals have been used to indicate corresponding parts in the two embodiments.
• Figures 4 to 4h indicate some of the alternative designs of rotor element which can be used in place of pick tines 18 iri the embodiments of Figures 1 and 2 and Figure 3, namely a straight spike 26, basic L-blade 28, curved spike 30, twisted blade 32 which may either be mounted radially (Figure 4e) or tangentially (Figure 4f) , and extended L-blade 34. Also illustrated is a serrated disc 36 which can be used to replace the entire rotor 16 rather than just its tines. A pick tine 18 is included for completeness. It will be appreciated of course that these various items are not to scale.
• the shear action on which the cultivator of the present invention relies is thought to provide a better soil breakdown than can normally be achieved with conventional designs of rotary cultivators and it also results in better trash incorporation and in a more suitable tilth, i.e. neither too fine nor too coarse, across the width of the machine.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Soil Sciences (AREA)
• Environmental Sciences (AREA)
• Soil Working Implements (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=10522786

Family Applications (1)

Country Status (3)

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Family Cites Families (6)

• 1981
  • 1981-06-25 GB GB08119564A patent/GB2100561A/en not_active Withdrawn
• 1982
  • 1982-06-25 EP EP19820901853 patent/EP0094939A1/de not_active Withdrawn
  • 1982-06-25 WO PCT/GB1982/000187 patent/WO1983000001A1/en not_active Ceased

Non-Patent Citations (1)

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