EP0295511B1 - Equipment for loasening sail - Google Patents

Equipment for loasening sail Download PDF

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Publication number
EP0295511B1
EP0295511B1 EP88108857A EP88108857A EP0295511B1 EP 0295511 B1 EP0295511 B1 EP 0295511B1 EP 88108857 A EP88108857 A EP 88108857A EP 88108857 A EP88108857 A EP 88108857A EP 0295511 B1 EP0295511 B1 EP 0295511B1
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EP
European Patent Office
Prior art keywords
harrow
raking
limiting
travel
comb
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP88108857A
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German (de)
French (fr)
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EP0295511A1 (en
Inventor
Wilfried Schomäcker
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Amazonen Werke H Dreyer SE and Co KG
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Amazonen Werke H Dreyer SE and Co KG
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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/06—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road
    • E01C23/08—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades
    • E01C23/085—Devices or arrangements for working the finished surface; Devices for repairing or reconditioning the surface of damaged paving; Recycling in place or on the road for roughening or patterning; for removing the surface down to a predetermined depth high spots or material bonded to the surface, e.g. markings; for maintaining earth roads, clay courts or like surfaces by means of surface working tools, e.g. scarifiers, levelling blades using power-driven tools, e.g. vibratory tools

Definitions

  • the invention relates to a device for loosening soil, in particular for loosening up tennis courts, which has at least two tine bars arranged one behind the other, which are set with tines and which are set in a reciprocating motion transversely to the direction of travel by means of a drive mechanism.
  • Such a device is already known from German utility model 78 36 976.
  • This device has, behind the two harrow beams arranged one behind the other, a planing rail extending over the entire working width, a roller and a broom with brushes.
  • this device known as a sports field maintenance device, the floors of tennis courts are to be restored regardless of their soil density, their moisture content and their surface properties, whereby the greatest possible evenness should be given with uniformity in their degree of compaction and good water permeability.
  • this sports field maintenance device sports ground or the like. Different consistency and ripple can be reprocessed, but the requirement for a flat surface of the tennis courts can not always be met with this known device, since in the respective outer areas of the reciprocating movement transversely driven to the direction of travel Harrows small ramparts can arise, these ramparts are formed by the soil particles, which may be transported from the tines arranged in the outer areas of the harrow bars to the outside, i.e. in the area outside the working width of the trailing roller, so that the adjacent individual working tracks of the sports field maintenance device are recognizable. This creates a loosened upper layer of soil, but the surface of the soil is still uneven due to the formation of walls.
  • the invention is based on the object of effectively avoiding the formation of a wall at the end of the working area of the generic device when loosening tennis courts, in particular sports fields with a slag pad, using simple means.
  • the fact that the border harrow is designed as a plate creates a lateral delimitation next to the harrow beams, which prevents the soil from flowing out laterally from the area of the tines, so that the wall formation is prevented.
  • the elongated breakthrough opening is intended to prevent soil particles from accumulating in front of the border harrows, since the elongated breakthrough opening causes the possibly accumulating material to be evenly distributed through the opening, thereby ensuring a loosened, even surface of the tennis court area.
  • the German utility model 69 30 352 already discloses a harrow designed as a tillage machine, which has border harrows arranged at the outer ends of a harrow beam. These harrow tines are equipped with individual harrow tines arranged at intervals from one another, the harrow tines being fastened to a holding rail.
  • the respective position of the border harrows in relation to the harrow beam can be changed depending on the nature of the soil to be worked, which means that the work effectiveness of these border harrows can be adapted to the different types of soil.
  • border harrows arranged at the outer ends of the harrow beam, the not yet divided lumps of soil, which have been led outwards along the tine carriers, are to be crushed and the lateral ridging dams are leveled out.
  • the known border harrows are intended to improve the work intensity in the outer area of the harrow beams and can serve to change the working width of the harrow.
  • FR-A-24 05 629 describes a rotary harrow with side shielding plates attached to the frame of the Rotary harrow are fixed vertically and laterally. These plates are therefore not arranged on the motor-driven tool carriers. These shielding plates are also intended to prevent lateral wall formation. This may be possible when cultivating arable land, but this design of the shielding plates is not suitable for loosening up tennis courts.
  • the harrow can be adjusted to the depth of penetration of the tines into the sports ground, the harrow is height-adjustable on the harrow beam.
  • the sports field maintenance device consists of the vibrating harrow 1, which has two harrow beams 3 arranged one behind the other and equipped with tines 2.
  • the harrow beams 3 are moved back and forth across the direction of travel 5 by the drive mechanism 4.
  • the harrow device 11 which is designed as a broom 10 and is adjustable in height, is articulated and connected to the support frame 7 of the trailing roller 8 via the brackets 12.
  • the support frame 7 has the two lateral brackets 13, each of which is equipped with a pin 14. On this pin 14 each in the direction of travel 5 projecting forward, the joint 15 having bracket 16 is hinged to which the border broom 17 is attached.
  • the adjustable stop brackets 18 arranged on the lateral brackets 13 of the trailing roller 8 limit the downward movement of the brackets 16 receiving the limit brooms 17. Characterized in that the stop brackets 18 are designed as adjustable components, it is possible to compensate for the wear of the boundary brush 17, so that the boundary brush 17 always cooperate with the floor surface 9.
  • the front harrow beam 3 in its outer area can be adjusted in height by means of the holder 19 of the limit harrow 21 designed as a plate 20 attached.
  • the plate 20 of the harrow 21 has the breakthrough opening 22 extending in the direction of travel 5.
  • the limit harrows 21 limit the outflow of soil particles from the working area of the harrow beams 3 or the trailing roller 8, so that wall formation is prevented from the outset with simple means and a flat surface of the loosened Tennenplatz arises.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Soil Working Implements (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur Lockerung von Böden, insbesondere zur Auflockerung von Tennenplätzen, die zumindest zwei hintereinander angeordnete, mit Zinken besetzte Eggenbalken aufweist, welche über einen Antriebsmechanismus in hin- und hergehende Bewegung quer zur Fahrtrichtung versetzt werden.The invention relates to a device for loosening soil, in particular for loosening up tennis courts, which has at least two tine bars arranged one behind the other, which are set with tines and which are set in a reciprocating motion transversely to the direction of travel by means of a drive mechanism.

Eine derartig ausgebildete Vorrichtung ist bereits durch das deutsche Gebrauchsmuster 78 36 976 bekannt. Diese Vorrichtung weist hinter den zwei hintereinander angeordneten Eggenbalken noch eine über die gesamte Arbeitsbreite reichende Hobelschiene, eine Walze und einen Bürsten aufweisenden Besen auf. Mit dieser, als Sportplatzpflegegerät bezeichneten Vorrichtung sollen die Böden von Tennenplätzen unabhängig von ihrer Bodendichte, ihrem Feuchtigkeitsgehalt und ihrer Oberflächenbeschaffenheit wieder hergerichtet werden, wobei eine größtmögliche Ebenheit bei Gleichmäßigkeit in ihrem Verdichtungsgrad hergerichteten Boden und guter Wasserdurchlässigkeit gegeben sein soll.Such a device is already known from German utility model 78 36 976. This device has, behind the two harrow beams arranged one behind the other, a planing rail extending over the entire working width, a roller and a broom with brushes. With this device, known as a sports field maintenance device, the floors of tennis courts are to be restored regardless of their soil density, their moisture content and their surface properties, whereby the greatest possible evenness should be given with uniformity in their degree of compaction and good water permeability.

Mittels dieses Sportplatzpflegegerätes lassen sich zwar Sportplatzböden oder dgl. verschiedener Konsistenz und Welligkeit wieder aufbereiten, aber die Forderung nach einer ebenen Oberfläche der Tennenplätze kann mit dieser bekannten Vorrichtung nicht immer erfüllt werden, da in den jeweiligen äußeren Bereichen der in hin- und hergehende Bewegung quer zur Fahrtrichtung angetriebenen Eggenbalken kleine Wälle entstehen können, Diese Wälle werden von den Bodenpartikeln gebildet, die evtl. von den in den äußeren Bereichen der Eggenbalken angeordneten Zinken nach außen, d.h. in den Bereich außerhalb der Arbeitsbreite der Nachlaufwalze transportiert werden, so daß die nebeneinanderliegenden einzelnen Arbeitsbahnen des Sportplatzpflegegerätes erkennbar sind. Hierdurch entsteht zwar eine aufgelockerte obere Bodenschicht, aber die Bodenoberfläche weist immer noch Bodenunebenheiten, hervorgerufen durch die Wallbildung, auf.By means of this sports field maintenance device, sports ground or the like. Different consistency and ripple can be reprocessed, but the requirement for a flat surface of the tennis courts can not always be met with this known device, since in the respective outer areas of the reciprocating movement transversely driven to the direction of travel Harrows small ramparts can arise, these ramparts are formed by the soil particles, which may be transported from the tines arranged in the outer areas of the harrow bars to the outside, i.e. in the area outside the working width of the trailing roller, so that the adjacent individual working tracks of the sports field maintenance device are recognizable. This creates a loosened upper layer of soil, but the surface of the soil is still uneven due to the formation of walls.

Der Erfindung liegt nun die Aufgabe zugrunde, die Wallbildung an dem Ende des Arbeitsbreiches der gattungsgemäßen Vorrichtung bei der Auflockerung von Tennenplätzen, insbesondere Sportplätzen mit Schlackenauflage, mit einfachen Mitteln wirkungsvoll zu vermeiden.The invention is based on the object of effectively avoiding the formation of a wall at the end of the working area of the generic device when loosening tennis courts, in particular sports fields with a slag pad, using simple means.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Maßnahmen des Anspruches 1 gelöst.According to the invention, this object is achieved by the characterizing measures of claim 1.

Infolge dieser Maßnahme wird verhindert, daß sich Bodenteile nach außen außerhalb der Arbeitsbreite des Sportplatzpflegegerätes bewegen können. Ein Abwandern der Bodenteile wird somit also unterbunden, so daß es auch zu keiner Wallbildung seitlich des Arbeitsbereiches des Sportplatzpflegegerätes führen kann. Die Grenzstriegel sorgen dafür, daß die evtl. von den äußeren Zinken nach außen bewegten Bodenpartikel immer wieder in Richtung auf die Eggenbalken verlagert und eingeebnet werden, so daß stets eine ebene Bodenoberfläche der Tennenplätze entsteht und die einzelnen Arbeitsbahnen des Sportplatzpflegegerätes nicht erkennbar sind.As a result of this measure, it is prevented that floor parts can move outside the working width of the sports field maintenance device. A migration of the floor parts is thus prevented, so that it cannot lead to any wall formation to the side of the work area of the sports field maintenance device. The border harrows ensure that any soil particles that may have moved outwards from the outer tines are repeatedly shifted and leveled in the direction of the harrow beams, so that there is always a flat surface on the floor of the tennis courts and the individual work areas of the sports field maintenance device are not recognizable.

Dadurch, daß der Grenzstriegel als Platte ausgebildet ist, wird jeweils eine seitliche Abgrenzung neben den Eggenbalken geschaffen, die das seitliche herausfließen des Bodens aus dem Bereich der Zinken verhindert, so daß die Wallbildung unterbunden wird. Die längliche Durchbruchsöffnung soll verhindern, daß sich Bodenpartikel vor den Grenzstriegeln anhäufen, da die längliche Durchbruchsöffnung eine gleichmäßige Verteilung des sich evtl. anhäufenden Materials durch die Öffnung bewirkt, wodurch eine aufgelockerte, ebene Tennenplatzoberfläche gewährleistet ist.The fact that the border harrow is designed as a plate creates a lateral delimitation next to the harrow beams, which prevents the soil from flowing out laterally from the area of the tines, so that the wall formation is prevented. The elongated breakthrough opening is intended to prevent soil particles from accumulating in front of the border harrows, since the elongated breakthrough opening causes the possibly accumulating material to be evenly distributed through the opening, thereby ensuring a loosened, even surface of the tennis court area.

Durch das deutsche Gebrauchsmuster 69 30 352 ist bereits eine als Bodenbearbeitungsmaschine ausgebildete Rüttelegge bekannt, die an den äußeren Enden eines Eggenbalkens angeordnete Grenzstriegel aufweist. Diese Grenzstriegel sind mit einzelnen, in Abständen zueinander angeordneten Striegelzinken ausgerüstet, wobei die Striegelzinken an einer Halteschiene befestigt sind. Die jeweilige Lage der Grenzstriegel gegenüber dem Eggenbalken läßt sich je nach Beschaffenheit des zu bearbeitenden Bodens verändern, wodurch sich die von diesen Grenzstriegeln geleistete Arbeitseffektivität den unterschiedlichen Bodenarten anpassen läßt. Mittels dieser an den äußeren Enden des Eggenbalkens angeordneter Grenzstriegel sollen die noch nicht zerteilten Bodenklumpen, die entlang der Zinkenträger nach außen geführt worden sind, zerkleinert und die seitlichen Häufeldämme eingeebnet werden. Die bekannten Grenzstriegel sollen die Arbeitsintensität im äußeren Bereich der Eggenbalken verbessern und können dazu dienen, die Arbeitsbreite der Rüttelegge zu verändern.The German utility model 69 30 352 already discloses a harrow designed as a tillage machine, which has border harrows arranged at the outer ends of a harrow beam. These harrow tines are equipped with individual harrow tines arranged at intervals from one another, the harrow tines being fastened to a holding rail. The respective position of the border harrows in relation to the harrow beam can be changed depending on the nature of the soil to be worked, which means that the work effectiveness of these border harrows can be adapted to the different types of soil. By means of these border harrows arranged at the outer ends of the harrow beam, the not yet divided lumps of soil, which have been led outwards along the tine carriers, are to be crushed and the lateral ridging dams are leveled out. The known border harrows are intended to improve the work intensity in the outer area of the harrow beams and can serve to change the working width of the harrow.

Da sich die Bearbeitung eines Ackerbodens wesentlich von der Auflockerung von Tennenplätzen unterscheidet, ist es nicht möglich, die bekannten Grenzstriegel mit ihren Striegelzinken an einem Eggenbalken eines Sportplatzpflegegerätes anzuordnen, und somit ein herausfließen von Bodenteilen aus dem Arbeitsbereich der Eggenbalken zu unterbinden.Since the cultivation of arable soils differs significantly from the loosening of turf pitches, it is not possible to arrange the known border harrows with their harrow tines on a harrow beam of a sports field maintenance device, and thus to prevent soil parts from flowing out of the working area of the harrow beams.

Die FR-A-24 05 629 beschreibt eine Kreiselegge mit seitlichen Abschrirmplatten, die an dem Rahmen der Kreiselegge höhen- und seitenbeweglich befestigt sind. Diese Platten sind also nicht an den motorisch angetriebenen Werkzeugträgern angeordnet. Diese Abschirmplatten sollen auch bereits eine seitliche Wallbildung verhindern. Dieses mag bei der Bearbeitung eines Ackerbodens möglich sein, für die Auflockerung von Tennenplätzen ist diese Ausbildung der Abschirmplatten jedoch nicht geeignet.FR-A-24 05 629 describes a rotary harrow with side shielding plates attached to the frame of the Rotary harrow are fixed vertically and laterally. These plates are therefore not arranged on the motor-driven tool carriers. These shielding plates are also intended to prevent lateral wall formation. This may be possible when cultivating arable land, but this design of the shielding plates is not suitable for loosening up tennis courts.

Damit sich die Grenzstriegel den jeweiligen Eindringtiefen der Zinken in den Sportplatzboden anpassen lassen, sind die Grenzstriegel in der Höhe verstellbar an dem Eggenbalken angeordnet.So that the harrow can be adjusted to the depth of penetration of the tines into the sports ground, the harrow is height-adjustable on the harrow beam.

Weitere Einzelheiten der Erfindung sind der Beispielsbeschreibung und den Zeichnungen zu entnehmen. Hierbei zeigen

  • Fig. 1 das in erfindungsgemäßer Weise ausgebildete Sport­platzpflegegerät in Prinzipdarstellung, in der Seitenansicht,
  • Fig. 2 das Sportplatzpflegegerät gemäß Fig. 1 ohne Grenzbesen und
  • Fig. 3 das Sportplatzpflegegerät gemäß Fig. 1 in der Draufsicht.
Further details of the invention can be found in the example description and the drawings. Show here
  • 1 is a schematic representation of the sports field maintenance device designed in accordance with the invention, in a side view,
  • Fig. 2, the sports field maintenance device according to FIG. 1 without a broom and
  • Fig. 3, the sports field maintenance device according to FIG. 1 in plan view.

Das Sportplatzpflegegerät besteht aus der Rüttelegge 1, die zwei hintereinander angeordnete, mit Zinken 2 besetzte Eggenbalken 3 aufweist. Die Eggenbalken 3 werden über den Antriebsmechanismus 4 in hin- und hergehende Bewegungen quer zur Fahrtrichtung 5 versetzt. Über die Haltearme 6 ist die hinter der Rüttelegge 1 angeordnete, drehbar in dem Tragrahmen 7 gelagerte Nachlaufwalze 8 mit der Rüttelegge 1 verbunden. Mittels dieser auf der Bodenoberfläche 9 abrollenden Nachlaufwalze 8 wird die jeweilige Eindringtiefe der Zinken 2 der Rüttelegge 1 in den Boden millimetergenau eingestellt. Hinter der Nachlaufwalze 8 ist die als Besen 10 höhenverstellbar ausgebildete Striegeleinrichtung 11 angelenkt und über die Halterungen 12 mit dem Tragrahmen 7 der Nachlaufwalze 8 verbunden. Der Tragrahmen 7 weist die beiden seitlichen Halterungen 13 auf, die jeweils mit einem Zapfen 14 ausgerüstet sind. An diesen Zapfen 14 ist jeweils die in Fahrtrichtung 5 nach vorn ragende, das Gelenk 15 aufweisende Halterung 16 angelenkt, an die der Grenzbesen 17 befestigt ist. Die an den seitlichen Halterungen 13 der Nachlaufwalze 8 angeordneten, einstellbaren Anschlaghalterungen 18 begrenzen die Bewegung der die Grenzbesen 17 aufnehmenden Halterungen 16 nach unten. Dadurch, daß die Anschlaghalterungen 18 als einstellbare Bauteile ausgebildet sind, ist es möglich, die Abnutzung der Grenzbesen 17 auszugleichen, so daß die Grenzbesen 17 immer mit der Bodenoberfläche 9 zusammenwirken. Um nun die Wallbildung durch von den äußeren Zinken 2 in den Bereich außerhalb der Arbeitsbreite des Sportplatzpflegegerätes bewegten Bodenpartikel mit einfachen Mitteln wirkungsvoll zu vermeiden, ist an dem vorderen Eggenbalken 3 jeweils in seinem äußeren Bereich mittels der Halterung 19 der als Platte 20 ausgebildete Grenzstriegel 21 höhenverstellbar befestigt. Die Platte 20 des Grenzstriegels 21 weist die in Fahrtrichtung 5 sich erstreckende Durchbruchsöffnung 22 auf.The sports field maintenance device consists of the vibrating harrow 1, which has two harrow beams 3 arranged one behind the other and equipped with tines 2. The harrow beams 3 are moved back and forth across the direction of travel 5 by the drive mechanism 4. The trailing roller 8, which is arranged behind the vibrating harrow 1 and is rotatably mounted in the support frame 7, is connected to the vibrating harrow 1 via the holding arms 6. By means of this trailing roller 8 rolling on the bottom surface 9, the the respective depth of penetration of the tines 2 of the harrow 1 into the ground is adjusted to the millimeter. Behind the trailing roller 8, the harrow device 11, which is designed as a broom 10 and is adjustable in height, is articulated and connected to the support frame 7 of the trailing roller 8 via the brackets 12. The support frame 7 has the two lateral brackets 13, each of which is equipped with a pin 14. On this pin 14 each in the direction of travel 5 projecting forward, the joint 15 having bracket 16 is hinged to which the border broom 17 is attached. The adjustable stop brackets 18 arranged on the lateral brackets 13 of the trailing roller 8 limit the downward movement of the brackets 16 receiving the limit brooms 17. Characterized in that the stop brackets 18 are designed as adjustable components, it is possible to compensate for the wear of the boundary brush 17, so that the boundary brush 17 always cooperate with the floor surface 9. In order to effectively prevent the formation of walls by soil particles moving from the outer tines 2 into the area outside the working width of the sports field maintenance device, the front harrow beam 3 in its outer area can be adjusted in height by means of the holder 19 of the limit harrow 21 designed as a plate 20 attached. The plate 20 of the harrow 21 has the breakthrough opening 22 extending in the direction of travel 5.

Werden nun die Eggenbalken 3 in hin- und hergehende Bewegung angetrieben, begrenzen jeweils die Grenzstriegel 21 das Hierausfließen von Bodenpartikeln aus dem Arbeits­bereich der Eggenbalken 3 bzw. der Nachlaufwalze 8, so daß eine Wallbildung von vornherein mit einfachen Mitteln verhindert wird und eine ebene Oberfläche des aufgelockerten Tennenplatzes entsteht.If the harrow beams 3 are now driven in a reciprocating motion, the limit harrows 21 limit the outflow of soil particles from the working area of the harrow beams 3 or the trailing roller 8, so that wall formation is prevented from the outset with simple means and a flat surface of the loosened Tennenplatz arises.

Claims (2)

1. Apparatus for loosening soil, more especially for loosening-up threshing floors, which includes at least two harrow bars (3), which are disposed one behind the other and are provided with tines (2), said bars being set in reciprocating motion transversely relative to the direction of travel (5) via the intermediary of a drive mechanism (4), characterised in that limiting raking combs (21) are disposed on at least one of the harrow bars (3) at its outer ends; each respective limiting raking comb (21) is disposed on the harrow bar (3) so as to extend at least approximately parallel to the direction of travel (5) and at right angles to the longitudinal direction of the harrow bars (3); each limiting raking comb (21) is adapted to be smooth on its lower side; each limiting raking comb (21) is in the form of plate (20), the plate (20) being provided with an elongate through-aperture (22) which extends in the direction of travel (5).
2. Apparatus according to claim 1, characterised in that each limiting raking comb (21) is disposed on the harrow bar (3) so as to be vertically adjustable.
EP88108857A 1987-06-13 1988-06-03 Equipment for loasening sail Expired - Lifetime EP0295511B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8708360U DE8708360U1 (en) 1987-06-13 1987-06-13 Device for loosening soil
DE8708360U 1987-06-13

Publications (2)

Publication Number Publication Date
EP0295511A1 EP0295511A1 (en) 1988-12-21
EP0295511B1 true EP0295511B1 (en) 1991-03-06

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ID=6809109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88108857A Expired - Lifetime EP0295511B1 (en) 1987-06-13 1988-06-03 Equipment for loasening sail

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DE (2) DE8708360U1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023108693A1 (en) 2023-04-05 2024-10-10 Amazonen-Werke H. Dreyer SE & Co. KG Agricultural machine for soil cultivation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6930352U (en) * 1969-07-31 1970-08-27 Amazonen Werke Dreyer H RUETTELEGGE
NL7508821A (en) * 1975-07-24 1977-01-26 Lely Nv C Van Der SOIL WORKING MACHINE.
US4088083A (en) * 1976-11-05 1978-05-09 C. Van Der Lely N.V. Rotary harrow and attachments
NL7711276A (en) * 1977-10-14 1979-04-18 Lely Nv C Van Der SOIL WORKING MACHINE.
FR2440141A1 (en) * 1978-11-02 1980-05-30 Curdi Timothee Adjustable depth harrowing attachment for tractor - has frame supported on skids with toothed roller and hydraulically adjustable rake teeth
DE7836976U1 (en) * 1978-12-14 1987-03-12 Schliesing, Hans, 4100 Duisburg Sports field maintenance equipment with a rake for loosening the soil
DE8030612U1 (en) * 1980-11-15 1986-04-10 Weichel, Ernst, 7326 Heiningen Device for loosening and breaking up compacted soil layers
DE3518991A1 (en) * 1985-05-25 1986-11-27 Amazonen-Werke H. Dreyer Gmbh & Co Kg, 4507 Hasbergen Vibrating harrow

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DE8708360U1 (en) 1988-10-13
EP0295511A1 (en) 1988-12-21
DE3861918D1 (en) 1991-04-11

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