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
  • 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
  • A01B33/08—Tools; Details, e.g. adaptations of transmissions or gearings
  • A01B33/14—Attaching the tools to the rotating shaft, e.g. resiliently or flexibly-attached tools
  • A01B33/146—Attaching the tools to the rotating shaft, e.g. resiliently or flexibly-attached tools the rotating shaft being oriented vertically or steeply inclined

Definitions

• the present invention relates the field of the agricultural machines and in particular it concerns rotating harrows to vertical axles.
• rotating harrows to vertical axles receive the motion from the agricultural machine and, through an opportune transmission, they transfer the spin to a series of rotores to vertical axles provided with tools called knives.
• the rotores generally consist of discs or flanges; the knives are provided with a working part (the blade of the knife) and a fastening part usually perpendicular to the working part.
• a common harrow is usually provided with many couples of knives so their replacement requires a long machine stopping which increases time of effective working of the land.
• it has been designated and implemented a new type of knife for harrows which can be assemblied and disassemblied quickly and safetely.
• the new knife for harrows can be used for forging or successive workings from laminated shape and is identical to well-known knives for harrows except for the fact that its part of connection is conformed for a "bayonet connection".
• notchings placed from the normal position of the holes for screws to one of the edges of the connection part.
• Such notchings can be right angle shaped, arcuate shaped or stairs shaped or a combinations of all the above mentioned shapes; they mostly- have radial direction from the connection part towards the center in respect to the sense of spin of the knife.
• the above mentioned notchings allow the connection and the disconnection of the knife between the flange and the screwhead, that is unscrewing a little the screws it is possible to unscrew the worn knife and to insert a new one.
• the attachment part of the knife slides between the flange of the rotor and the screwhead while the body of the screws slides inside the notchings of said part of the attachment of the knife.
• the body of the screws leans against the bottom of the notchings, the knife is exactly in the correct position to be used.
• the screws are not sufficient to maintain the knife in the right position, so it is necessary, for example, to resort to particular means or devices such as a particular shape of notchings and/or stop plates.
• the stop plates are placed between the screwhead and the connection part, they are provided with tongues or edges or tooth-bended extremities so that they can be inserted in slots or profiles with stairs shape placed on the connection part of the knife.
• a new knife for harrows as it has been exposed above, which allows to avoid the use of the nuts and to use only the fastening screws inserted in the threaded holes, eventually blind, of the bracket the rotor.
• the new knife can be provided with shaped notchings or it can be prevented from unscrewing by means of a stop plate, in both cases it is always sufficient a slight unscrewing of the fastening screws of a such measure not to tighten the connection part of the knife and to remove the stop plate from it.
• the figures la and lb show an example of the new knife (1) obtained from rolled shapes and following workings.
• the two views are respectively a partial vertical section and a bottom view.
• the "R” arrow shows the spin direction of the knife (1).
• the connection part (11) of the knife (1) has two notchings (12) placed between the position of the screws (2) and the edge (13) of the connection part which is opposite to the blade (14); the notchings (12) have a linear side (121) and a stair or undercut shaped side (122).
• a stop plate (3, dotted in figure lb) is placed between the screwhead (2) and connection part (11) of the knife (1).
• the stop plate is provided with two toothed tongues (31) placed on the stair or undercut shaped side (122) of the notchings (12).
• the figures la and lb show a second example of the new knife (1) obtained from rolled shapes and following workings.
• the two views are respectively a partial vertical section and a bottom view.
• the "R" arrow shows the spin direction of the knife
• connection part (11) of the knife (1) has two notchings (12) placed between the position of the screws (2) and the edge (13) of the connection part which is opposite to the blade (14); in proximity of such edge (13) of the connection part (11), on the opposite surface to the flange of the rotor (4), a slot (15) is present.
• a stop plate (3, dotted in figure 2b) is placed between the screwhead (2) and the connection part (11) of the knife (1). It has an edge (32) bent towards the flange of the rotor (4).
• connection part (11) of the knife (1) is provided with two notchings (16a, 16p) placed between the position of the screws (2a, 2p) and the edge (13) of the connection part which is opposite to the blade (14).
• the two notchings (16a, 16p) have arcuate and/or multiarcuate shape which would be sufficient, by themselves, to prevent the knife (1) from unscrewing from the screws (2a, 2p) and from the flange of rotor (4).
• the notchings (16a, 16p) have to hold up both the friction of the land which make the knife (1) to reverse in the opposite direction to its spin (R), and the centrifugal force (L) due to the penetration of the blade (14) of the knife (1) in the land which make the knife (1) to rotate around the back screw
• the friction of the land is hold up by both the notchings (16a, 16p) which are arranged in a perpendicular direction to the spin of the knife (1).
• (16 A) prevent the centrifugal force of the spin of the knife (1) around the back screw (2p).
• a stop plate (3, dotted in figure 3b) with bent tongues (33) on one or more of its edges so as to wind the connection part (11) of the knife (1).
• connection part (11) of the knife (1) on the flange of the rotor (4) When the fastening screws (2a, 2p) are completely tightened they hold in a safety way the connection part (11) of the knife (1) on the flange of the rotor (4).
• stop plate (3) helps to assure that the knife (1) will not be unscrewed.

Landscapes

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

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11391812

Family Applications (1)

Country Status (4)

Cited By (5)

Citations (5)

• 1997
  • 1997-05-14 IT IT97PD000105A patent/IT1293476B1/it active IP Right Grant
• 1998
  • 1998-05-13 WO PCT/IT1998/000119 patent/WO1998051141A1/en not_active Application Discontinuation
  • 1998-05-13 AU AU72336/98A patent/AU7233698A/en not_active Abandoned
  • 1998-05-13 EP EP98919486A patent/EP0981269A1/en not_active Withdrawn

Patent Citations (5)

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