EP0505702B1 - Garden waste shredder with a blade housing containing rotating, powered flat blades and pre-shredding blades - Google Patents

Garden waste shredder with a blade housing containing rotating, powered flat blades and pre-shredding blades Download PDF

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Publication number
EP0505702B1
EP0505702B1 EP92102030A EP92102030A EP0505702B1 EP 0505702 B1 EP0505702 B1 EP 0505702B1 EP 92102030 A EP92102030 A EP 92102030A EP 92102030 A EP92102030 A EP 92102030A EP 0505702 B1 EP0505702 B1 EP 0505702B1
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EP
European Patent Office
Prior art keywords
blade
blades
cutting
preliminary shredding
shredding blades
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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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EP92102030A
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German (de)
French (fr)
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EP0505702A1 (en
Inventor
Günther Hilgarth
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Crones and Co GmbH
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Crones and Co GmbH
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Publication of EP0505702A1 publication Critical patent/EP0505702A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/08—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers
    • B02C18/12—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within vertical containers with drive arranged below container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
    • B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
    • B02C2201/066—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage for garden waste

Definitions

  • the invention relates to a garden shredder with a knife housing arranged on a frame supporting the drive motor and a feed hopper and surrounding a lower ejector chamber, in which there is a knife carrier disk to be driven around a substantially vertical axis, which has essentially radially extending passage slots, above which a plane knife arranged flat knives as well as centrally arranged, upright pre-comminution knives, and wherein an abutment insert is further provided in the knife housing, which has a lower counter cutting edge interacting with the flat knives as well as a gate-like recess which overlaps the pre-comminution knives and has an inner counter-cutting edge interacting with them, the between the intermediate space lying in front of the comminution knives has a filling which at least partially fills its lower region and serves to limit the chip thickness piece is arranged, and chip passage slots are provided between the latter and the pre-shredding knives, which expand in the opposite direction to the direction of rotation of the pre-shredding knives.
  • a chopper for shredding garden waste is known, with a cutting mechanism which contains a slotted knife disc rotatably mounted in a cutting housing and driven by a motor, on which knife blades are detachably fastened and on the underside of which ejection blades are attached, whereby a counter knife spans the knife disc in a bridge-like manner and is detachably fastened to a cutting housing.
  • a device for chopping garden waste with a housing provided with at least one ejection opening onto which a loading chute is placed, which is covered downwards by a carrier disc accommodated in the housing.
  • a high level of functionality with a small design is achieved in that the loading shaft has a cross-section which extends from the edge region of the carrier disc over its center provided with a deflector body, and in that the motor assigned to the carrier disc is suspended from the bottom of a housing chamber receiving the carrier disc which has discharge openings assigned to the circumferential indentations.
  • a device for shredding garden waste with a knife cutter that can be driven by a motor and drives under a stationary counterholder
  • the knife disk being arranged in a housing chamber provided with an ejection channel, into which a lower end of the knife disk is located blocked input shaft opens.
  • the stationary counter-holder is designed as a radially projecting nose which has an edge parallel to the cutter disc, which cooperates with the blades of the cutter disc, and an edge which delimits it radially on the inside, approximately perpendicular to the cutter disc plane which passes a cylindrical cutter disc attachment coaxially received on the cutter disc.
  • Plant shredders of the above type are known from DE-OS 37 22 339. They can be operated at a comparatively low speed and also relatively quietly and with a comparatively low drive power.
  • the material to be chopped in this way in particular twigs or knots in the form of garden waste, can be fed in unsorted via the feed hopper, because it is mainly sorted by the knife mechanism and the counter-cutting edges on the abutment insert that interact with it so that the larger or thicker branch material from the surrounding knives are pressed outwards and cut there by the flat knives, while the thinner branch and twig material is pressed inwards to the pre-shredding knives, where it is shredded or torn.
  • the circumferential pre-shredding knives consist of two knife plates arranged on a flat base plate fastened to the knife carrier disc and inclined relative to one another, between which there are comparatively large clearances both in the central and in particular in the peripheral area, into which stronger knots can sometimes get , which would then have to be cut or cut by the pre-comminution knives over comparatively large lengths.
  • these pre-comminution knives are often not able to do this, so that the chopper can drop rapidly or even completely block with corresponding damage, particularly to its knife mechanism.
  • the invention has for its object to provide a garden shredder of the type mentioned, which is designed in the area of its pre-shredding measuring unit so that it is not impaired or blocked even by stronger knots and such material can be crushed without problems and effectively.
  • the pre-comminution knives consist of two diametrically opposed knife blades, which are bent roof-shaped in their upper region
  • the filler piece consists of a coffin-shaped filler body flattened on both sides, slightly rotatably offset between the vertical sections of the knife blades especially in its upper part, which partially protrudes into the roof-shaped area of the knife blades, is correspondingly beveled in the manner of a truncated cone.
  • the pre-shredding knife mechanism can be effectively protected against excessive exposure to excessively strong or coarse knot material, because even such coarser or thicker branches can only get into the orbit of the pre-shredding knife blades over much shorter lengths, so that only whole short chips need to be cut off. With comparatively low drive power and low speed, this leads to effective shredding of this stronger knot material. This in turn also enables improved composting of the finely chopped chopped material obtained in this way.
  • the pre-comminution knives consist of two diametrically opposed knife blades, which are bent roof-shaped in their upper area, the filler piece consisting of its coffin-shaped filler body flattened on both sides, slightly rotatably offset between the vertical sections of the knife blades. which in its upper part, which partially protrudes into the roof-shaped area of the knife blades, is correspondingly beveled in the manner of a truncated cone.
  • a pre-shredding knife mechanism of this type with a filler designed in this way has proven to be very advantageous in practice because, on the one hand, this prevents too much penetration of thick knot material into the cutting area of the pre-shredding knives, but on the other hand it still allows good or deeper access to easier-to-grasp material .
  • the pre-comminution knives are provided in their rearward area in the circumferential direction with recesses which allow thinning of branches to be cut, so that thinner branch material has easier and deeper access to the cutting area of the pre-comminution knives.
  • the pre-comminution knives can in principle also be designed differently, in particular arranged continuously perpendicular and parallel to one another, but then the intermediate space between them is filled in almost all of its height by the filler including the chip passage slots lying on both sides of it.
  • the garden shredder shown only in part in FIGS. 1 and 2 is provided with a knife housing 1, which is arranged on a frame 4 carrying the drive motor 2 together with the gear 3, which also partially surrounds the ejector chamber 5.
  • the knife carrier disk 7, which is to be driven in rotation by the motor 2 via the gear 3 and the shaft 6, is provided, which is provided with radially extending passage slots 8 arranged over its circumference and flat knives 10 arranged behind it in the direction of rotation 9.
  • the pre-comminution knives 11 in the form of two upright and upwardly curved knife blades 11 ', 11' ', which are provided with correspondingly obliquely running cutting edges 11' '' in the direction of rotation.
  • a circumferential filler F which serves to limit the chip thickness and which is described in more detail below.
  • an abutment insert 13 with its two-sided fastening feet 13 'is exchangeably fastened in corresponding recesses 12 in the frame 4.
  • This abutment insert 13 consists of a one-piece, correspondingly shaped Iron or steel sheet. This divides the area above the revolving knife carrier disk 7 into a feed area 15 to be fed directly via the feed hopper 14 with the garden waste to be chopped and into the ejector area 16 connected to the ejector space 5. As shown in FIGS.
  • the abutment insert 13 has a flat web part 13 '' which runs flush with its fastening feet 13 'and which comes close to the orbit of the flat knives 10, and an inclined surface 13''', which is angled in relation thereto and has a gate-shaped recess 17 in its area surrounding the pre-comminution knives 11, one of which Gate flank 17 'forms an inner counter-cutting edge which interacts with the cutting edges 11''' of the pre-shredding knife.
  • the abutment insert 13 has a lower shear bar 18, which runs essentially radially, but runs tangentially to the enveloping circle of the pre-shredding knives 11, in order to interact with the flat knives present on the knife carrier disk 10 to act on the garden waste, which is to be chopped, in the feed space 15, in particular also thicker branch material, with retracting, inwardly directed cutting action.
  • the feed or filling funnel 14 which is made of thin-walled sheet metal or plastic, has an obliquely upright outer tube 19 which rests on the blade housing 1 or frame housing 4 in an easily replaceable manner via the base flange 20 which is firmly connected to it.
  • the vertical partition 21 present on the outer tube 19 abuts the upper part of the angled abutment insert 13 and thus ensures that the feed hopper 14 is sealed off from the ejector chamber 5.
  • the knife carrier disk 7 is provided with four radial passage slots 8 arranged uniformly distributed over its circumference and the flat knives 10 located behind it in the direction of rotation 9, which are exchangeably fastened in pronounced recesses in the knife carrier disk 7.
  • the knife edges of the flat knives 10 each consist of several short knife cutting sections 10 ′, 10 ′′, 10 ′′ ′′, which extend over a partial length range of less than half of the lower counter cutting edge 18 cooperating with them on the abutment insert 13, are of different heights and at least some of which are arranged radially offset from one another . In this way, narrow strips can be cut from thick branches instead of wide discs, which helps to protect the knife mechanism.
  • the pre-shredding knife mechanism is preferably of the type shown in FIGS. 3 to 6.
  • the pre-shredding knives 11 consist of two diametrically opposed knife blades 11 ′, 11 ′′, which are bent in a roof-like manner in their upper region and are preferably firmly connected to one another in the roof ridge by the weld seam 22.
  • the pre-shredding knife blades are formed by the correspondingly bent legs of an essentially U-shaped knife bar, which is fixed, in particular screwed, via the web 11 IV together with the filler F lying thereon, centrally on the knife carrier disk 7.
  • the filler F is flattened on both sides of a slightly rotationally offset between the vertical portions 11 V of the knife blades 11 arranged ', 11'', coffin-shaped filling body, the upper his, 11', 11 '' is partially protruding into the roof-shaped region of the blade wing part is correspondingly more conically beveled.
  • FIG. 4 which shows the section along line IV-IV, there are chip passage slots 23 between the filler body F and the two knife blades 11 ′, 11 ′′, which widen in the opposite direction to the direction of rotation 24 of the pre-comminution knife.
  • the abutment insert 13 with its gate-like recess 17 and its inner shear 17 'interacting with the pre-comminution knives 11 is also indicated by dash-dotted lines.
  • the circumferential pre-shredding knife 11, in cooperation with the inner shear bar 17 'and the contour of the filling body F, in any case the material to be chopped at the root cutting circle 25 with the chip thickness d machined, while in the overlying cutting area of the pre-shredding knife cutting edges 11 '''the achievable chip thickness varies and also essentially depends on the speed of the rotating knives 11 and also the drive power.
  • the pre-shredding knives 11 ', 11' ' are in their rear area in the circumferential direction 24 with recesses 27, 27'. provided, of which the uppermost 27 'consists of a flat that runs freely into the upper edge of the pre-shredding knife 11' '.
  • the slots 23, which widen in the direction opposite to the direction of rotation 24, between the filling body F and the pre-comminution knives 11 enable good chip passage or exit without the presence of the filling body F being an obstacle.
  • the latter can be exchangeably fastened to the knife carrier disk 7 in a simple form together with the knife bar 11 ', 11' 'having an essentially U-shaped angled knife bar.
  • the pre-comminution knives consist of two diametrically opposed, vertically extending knife blades 31 ', which are formed by the two legs of a U-shaped curved cutter bar 31.
  • the filler piece here consists of a cylinder body F 'flattened on both sides and slightly rotatably offset relative to the knife blades 31', which extends over almost the full height of the two knife blades 31 '. These are firmly connected to one another at the top by a transverse yoke 32.
  • chip passage slots 23 which widen in the direction opposite to the direction of rotation 24, so that here too a good chip passage is ensured. In this case, a constant chip thickness d can be achieved over the entire height of the pre-shredding cutter.
  • a substantially cylindrical, one-piece support body 35 which is again screw-fastened centrally on the knife carrier disk 7 and is provided with an upper and lower edge flange 36 and 37, is provided.
  • the narrower region of the supporting body located between the two flanges 36, 37 here forms the filler F ′′, which, because of its flats 40, 40 ′ on both sides, is in turn offset from the pre-comminution knives 39 fastened to the two edge flanges 36, 37 by means of the screws 38.
  • the support body 35 is provided in the region of its two edge flanges 36, 37 with corresponding lateral flats 36 '.
  • the pre-shredding knives 39 are provided here with both front and rear cutting edges 39 ', 39' ', so that they can be used as turning knives.
  • the position of the central region of the support body 35 forming the filling piece F ′′, which is offset in relation to the rotary comminution knives 39, ensures a corresponding rearward expansion of the chip passage slots 23.
  • the chip thickness d can be achieved here over practically the entire height of the pre-comminution knife mechanism, so that in this case there is also an effective comminution of the chopped material at this point and blockages caused by excessively strong knot material are prevented.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Harvester Elements (AREA)

Abstract

Garden waste shredders are provided with a blade housing (1) arranged on a frame (4) which bears the drive motor (2) and a charging funnel (14) and surrounds a lower ejection space (5) and in which there is a blade carrier disc (7) which is to be driven in rotation about an essentially vertical axis. Said blade carrier disc is provided with essentially radially extending passage slots, flat blades (10) arranged above the latter in the manner of cutting knives, and an upright, is provided centrally arranged pre-cutting blade (11). Furthermore, a counterbearing insert (13) is provided in the blade housing (1), said insert having a lower counter-cutter, which interacts with the flat blades (10), and a gate-like recess which engages over the pre-cutting blade (11) and has an inner counter cutter which interacts with the latter. In order to avoid the pre-cutting blade mechanism of the garden waste shredder being adversely affected or even blocked by relatively strong branch material, in the intermediate space located between the pre-cutting blades (11), a filler element (F) is arranged which at least partially takes up the lower area of said intermediate space and serves to limit the depth of cut, slots for the passage of woodchips also being provided between said filler element and the pre-cutting blades (11), which slots extend in the opposite direction from the direction of rotation of the pre-cutting blades. <IMAGE>

Description

Die Erfindung betrifft einen Gartenhäcksler mit einem auf einen den Antriebsmotor und einen Aufgabetrichter tragenden sowie einen unteren Auswerferraum umgebenden Gestell angeordneten Messergehäuse, in welchem eine um eine im wesentlichen senkrechte Achse umlaufend anzutreibende Messerträgerscheibe vorhanden ist, die mit im wesentlichen radial verlaufenden Duchtrittsschlitzen, oberhalb davon hobelmesserartig angeordneten Flachmessern sowie zentral angeordneten, aufrechtstehenden Vorzerkleinerungsmessern versehen ist, und wobei weiterhin im Messergehäuse ein Widerlagereinsatz vorgesehen ist, der eine mit den Flachmessern zusammenwirkende untere Gegenschneide sowie eine die Vorzerkleinerungsmesser übergreifende und eine mit ihnen zusammenwirkende innere Gegenschneide aufweisende torartige Aussparung besitzt, wobei in dem zwischen den Vorzerkleinerungsmessern liegenden Zwischenraum ein zumindest dessen unteren Bereich teilweise auffüllendes, der Spandicken-Begrenzung dienendes Füllstück angeordnet ist, und zwischen letzterem und den Vorzerkleinerungsmessern Spandurchtrittsschlitze vorgesehen sind, die sich in zur Umlaufrichtung der Vorzerkleinerungsmesser entgegengesetzter Richtung erweitern.The invention relates to a garden shredder with a knife housing arranged on a frame supporting the drive motor and a feed hopper and surrounding a lower ejector chamber, in which there is a knife carrier disk to be driven around a substantially vertical axis, which has essentially radially extending passage slots, above which a plane knife arranged flat knives as well as centrally arranged, upright pre-comminution knives, and wherein an abutment insert is further provided in the knife housing, which has a lower counter cutting edge interacting with the flat knives as well as a gate-like recess which overlaps the pre-comminution knives and has an inner counter-cutting edge interacting with them, the between the intermediate space lying in front of the comminution knives has a filling which at least partially fills its lower region and serves to limit the chip thickness piece is arranged, and chip passage slots are provided between the latter and the pre-shredding knives, which expand in the opposite direction to the direction of rotation of the pre-shredding knives.

Aus EP-A-0416315 ist ein Häcksler zum Zerkleinern von Gartenabfällen bekannt, mit einem Schneidwerk, das eine in einem Schneidgehäuse drehbar gelagerte und von einem Motor angetriebene geschlitzte Messerscheibe enthält, an der Messerklingen lösbar befestigt sind und an deren Unterseite Auswurfflügel angebracht sind, wobei ein Gegenmesser die Messerscheibe brückenartig überspannt und an einem Schneidgehäuse lösbar befestigt ist.From EP-A-0416315 a chopper for shredding garden waste is known, with a cutting mechanism which contains a slotted knife disc rotatably mounted in a cutting housing and driven by a motor, on which knife blades are detachably fastened and on the underside of which ejection blades are attached, whereby a counter knife spans the knife disc in a bridge-like manner and is detachably fastened to a cutting housing.

Aus EP-A-0251060 ist eine Vorrichtung zum Häckseln von Gartenabfällen mit einem mit mindestens einer Auswurföffnung versehenen Gehäuse bekannt, auf das ein Beschickungsschacht aufgesetzt ist, der durch eine im Gehäuse aufgenommene Trägerscheibe nach unten abgedeckt ist. Dabei wird eine hohe Funktionsfähigkeit bei kleiner Bauweise dadurch erreicht, daß der Beschickungsschacht einen Querschnitt aufweist, der sich vom Randbereich der Trägerscheibe über deren mit einem aufgesetzten Abweiskörper versehenen Zentrum hinweg erstreckt, und daß der der Trägerscheibe zugeordnete Motor am Boden einer die Trägerscheibe aufnehmenden Gehäusekammer aufgehängt ist, die den Umfangseinbuchtungen jeweils zugeordnete Auswurföffnungen aufweist.From EP-A-0251060 a device for chopping garden waste with a housing provided with at least one ejection opening is known, onto which a loading chute is placed, which is covered downwards by a carrier disc accommodated in the housing. A high level of functionality with a small design is achieved in that the loading shaft has a cross-section which extends from the edge region of the carrier disc over its center provided with a deflector body, and in that the motor assigned to the carrier disc is suspended from the bottom of a housing chamber receiving the carrier disc which has discharge openings assigned to the circumferential indentations.

Aus EP-A-0175313 ist eine Vorrichtung zum Zerkleinern von Gartenabfall mit einer mittels eines Motors antreibbaren, einen stationären Gegenhalter unterfahrenden Messerschneider bekannt, wobei die Messerscheibe in einer mit einem Auswurfkanal versehenen Gehäusekammer angeordnet ist, in die ein an seinem unteren Ende von der Messerscheibe abgesperrter Eingabeschacht einmündet. Bei dieser Vorrichtung wird eine störungsfreie und zuverlässige Arbeitsweise dadurch erreicht, daß der stationäre Gegenhalter als radial vorspringende Nase ausgebildet ist, die eine Messerscheibenparallele, mit den Messern der Messerscheibe zusammenwirkende Kante und eine diese radial innen begrenzende, etwa lotrecht zur Messerscheibenebene verlaufende Kante aufweist, an der ein koaxial auf der Messerscheibe aufgenommener, zylindrischer Messerscheibenaufsatz vorbeiläuft.From EP-A-0175313 a device for shredding garden waste with a knife cutter that can be driven by a motor and drives under a stationary counterholder is known, the knife disk being arranged in a housing chamber provided with an ejection channel, into which a lower end of the knife disk is located blocked input shaft opens. In this device, a trouble-free and reliable mode of operation is achieved in that the stationary counter-holder is designed as a radially projecting nose which has an edge parallel to the cutter disc, which cooperates with the blades of the cutter disc, and an edge which delimits it radially on the inside, approximately perpendicular to the cutter disc plane which passes a cylindrical cutter disc attachment coaxially received on the cutter disc.

Gartenhäcksler obiger Art sind durch die DE-OS 37 22 339 bekannt. Sie können mit vergleichsweise niedriger Drehzahl und auch verhältnismäßig geräuscharm und mit vergleichsweise geringer Antriebsleistung betrieben werden. Das damit zu häckselnde Material, also insbesondere zweig- oder astförmiges Gartenabfallgut, kann über den Aufgabetrichter unsortiert aufgegeben werden, weil es durch das Messerwerk und die damit zusammenwirkenden Gegenschneiden am Widerlagereinsatz überwiegend so sortiert wird, daß das im Durchmesser größere bzw. stärkere Astmaterial von den umlaufenden Messern nach außen gedrückt und dort von den Flachmessern zerspant wird, während das dünnere Ast- und Zweigmaterial nach innen zu den Vorzerkleinerungsmessern gedrückt wird, wo es zerkleinert bzw. zerrissen wird. Bei diesen bekannten Gartenhäckslern bestehen die umlaufenden Vorzerkleinerungsmesser aus zwei auf einer flach auf der Messerträgerscheibe befestigten Grundplatte dachartig zueinander geneigt angeordneten Messerplatten, zwischen denen sowohl im zentralen als auch insbesondere im peripheren Bereich vergleichsweise große Freiräume vorhanden sind, in die zuweilen auch stärkeres Astgut zu gelangen vermag, das dann über vergleichsweise grössere Längenabschnitte von den Vorzerkleinerungsmessern zerteilt bzw. zerschnitten werden müßte. Dazu sind aber diese Vorzerkleinerungsmesser häufig nicht in der Lage, so daß es dabei zu raschem Drehzahlabfall oder gar vollständigem Blockieren des Häckslers mit entsprechenden Beschädigungen insbesondere seines Messerwerks kommen kann.Garden shredders of the above type are known from DE-OS 37 22 339. They can be operated at a comparatively low speed and also relatively quietly and with a comparatively low drive power. The material to be chopped in this way, in particular twigs or knots in the form of garden waste, can be fed in unsorted via the feed hopper, because it is mainly sorted by the knife mechanism and the counter-cutting edges on the abutment insert that interact with it so that the larger or thicker branch material from the surrounding knives are pressed outwards and cut there by the flat knives, while the thinner branch and twig material is pressed inwards to the pre-shredding knives, where it is shredded or torn. In these known garden shredders, the circumferential pre-shredding knives consist of two knife plates arranged on a flat base plate fastened to the knife carrier disc and inclined relative to one another, between which there are comparatively large clearances both in the central and in particular in the peripheral area, into which stronger knots can sometimes get , which would then have to be cut or cut by the pre-comminution knives over comparatively large lengths. However, these pre-comminution knives are often not able to do this, so that the chopper can drop rapidly or even completely block with corresponding damage, particularly to its knife mechanism.

Der Erfindung liegt die Aufgabe zugrunde, einen Gartenhäcksler der eingangs erwähnten Art zu schaffen, der im Bereich seines Vorzerkleinerungsmesswerks so ausgebildet ist, daß es auch durch stärkeres Astmaterial nicht beeinträchtigt oder blockiert wird und auch solches Material störungsfrei und wirksam zerkleinert werden kann.The invention has for its object to provide a garden shredder of the type mentioned, which is designed in the area of its pre-shredding measuring unit so that it is not impaired or blocked even by stronger knots and such material can be crushed without problems and effectively.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Vorzerkleinerungsmesser aus zwei sich diametral gegenüberstehenden Messerflügeln bestehen, die in ihrem oberen Bereich dachförmig abgebogen sind, und das Füllstück aus einem beidseitig abgeflachten, leicht drehversetzt zwischen den senkrechten Abschnitten der Messerflügel angeordneten, sargförmigen Füllkörper besteht, der vor allem in seinem oberen, in den dachförmigen Bereich der Messerflügel teilweise hineinragenden Teil entsprechend kegelstumpfartig abgeschrägt verläuft.This object is achieved in that the pre-comminution knives consist of two diametrically opposed knife blades, which are bent roof-shaped in their upper region, and the filler piece consists of a coffin-shaped filler body flattened on both sides, slightly rotatably offset between the vertical sections of the knife blades especially in its upper part, which partially protrudes into the roof-shaped area of the knife blades, is correspondingly beveled in the manner of a truncated cone.

Auf diese Weise kann das Vorzerkleinerungsmesserwerk wirksam gegen zu starke Beaufschlagung durch allzu starkes bzw. grobes Astmaterial wirksam geschützt werden, weil auch solche gröberen bzw. stärkeren Äste nur noch über wesentlich kürzer bemessene Längenabschnitte in die Umlaufbahn der Vorzerkleinerungsmesserschneiden gelangen können, so daß dabei lediglich ganz kurze Späne davon abgehobelt zu werden brauchen. Das führt bei vergleichsweise geringer Antriebsleistung und niedriger Drehzahl zu einer wirksamen Zerkleinerung auch dieses stärkeren Astmaterials. Das wiederum ermöglicht auch eine verbesserte Kompostierung des so gewonnen, fein zerkleinerten Häckselmaterials.In this way, the pre-shredding knife mechanism can be effectively protected against excessive exposure to excessively strong or coarse knot material, because even such coarser or thicker branches can only get into the orbit of the pre-shredding knife blades over much shorter lengths, so that only whole short chips need to be cut off. With comparatively low drive power and low speed, this leads to effective shredding of this stronger knot material. This in turn also enables improved composting of the finely chopped chopped material obtained in this way.

Als besonders vorteilhaft hat es sich erwiesen, wenn die Vorzerkleinerungsmesser aus zwei sich diametral gegenüberstehenden Messerflügeln bestehen, die in ihrem oberen Bereich dachförmig abgebogen sind, wobei das Füllstück aus seinem beidseitig abgeflachten, leicht drehversetzt zwischen den senkrechten Abschnitten der Messerflügel angeordneten, sargförmigen Füllkörper besteht, der in seinem oberen, in den dachförmigen Bereich der Messerflügel teilweise hineinragenden Teil entsprechend kegelstumpfartig abgeschrägt verläuft. Ein so beschaffenes Vorzerkleinerungsmesserwerk mit derart gestaltetem Füllstück hat sich für die Praxis als sehr vorteilhaft erwiesen, weil damit einerseits einem allzu weiten Eindringen stärkeren Astmaterials in den Schneidbereich der Vorzerkleinerungsmesser gewehrt, andererseits aber leichter hächselbarem Gut immer noch ein guter bzw. auch tieferer Zutritt ermöglicht wird. In letzter Hinsicht hat es sich weiterhin als vorteilhaft erwiesen, wenn die Vorzerkleinerungsmesser in ihrem in Umlaufrichtung rückwärtigen Bereich mit das Zerspanen dünnerer Äste zulassenden Aussparungen versehen sind, wodurch also dünneres Astmaterial leichter und tieferen Zugang zum Schneidbereich der Vorzerkleinerungsmesser findet.It has proven to be particularly advantageous if the pre-comminution knives consist of two diametrically opposed knife blades, which are bent roof-shaped in their upper area, the filler piece consisting of its coffin-shaped filler body flattened on both sides, slightly rotatably offset between the vertical sections of the knife blades. which in its upper part, which partially protrudes into the roof-shaped area of the knife blades, is correspondingly beveled in the manner of a truncated cone. A pre-shredding knife mechanism of this type with a filler designed in this way has proven to be very advantageous in practice because, on the one hand, this prevents too much penetration of thick knot material into the cutting area of the pre-shredding knives, but on the other hand it still allows good or deeper access to easier-to-grasp material . In the last regard, it has also proven to be advantageous if the pre-comminution knives are provided in their rearward area in the circumferential direction with recesses which allow thinning of branches to be cut, so that thinner branch material has easier and deeper access to the cutting area of the pre-comminution knives.

Die Vorzerkleinerungsmesser können grundsätzlich auch anders ausgebildet, insbesondere durchgehend senkrecht und parallel zueinander verlaufend angeordnet werden, wobei dann aber der zwischen ihnen liegende Zwischenraum in seiner nahezu gesamten Höhe durch das Füllstück einschließlich der beidseitig von ihm liegenden Spandurchtrittsschlitze ausgefüllt wird.The pre-comminution knives can in principle also be designed differently, in particular arranged continuously perpendicular and parallel to one another, but then the intermediate space between them is filled in almost all of its height by the filler including the chip passage slots lying on both sides of it.

Weitere Merkmale nach der Erfindung sind in Unteransprüchen gekennzeichnet und werden nachstehend anhand der Zeichnungen näher erläutert.Further features according to the invention are characterized in the subclaims and are explained in more detail below with reference to the drawings.

In den Zeichnungen sind mehrere vorteilhafte Ausführungsbeispiele der Erfindung dargestellt. Dabei zeigen

Fig.1
den hier allein interessierenden Teilbereich des Gartenhäckslers in senkrechtem Schnitt,
Fig.2
die gleichfalls zum Teil geschnittene Draufsicht auf den Häcksler der Fig.1,
Fig.3,4,5 und 6
eine bevorzugte Ausführungsform des neuen Vorzerkleinerungsmesserwerks mit Füllstück in verschiedenen Ansichten und im Schnitt,
Fig.7,8,9 und 10
eine andere Ausführungsform des Messerwerks in entsprechend unterschiedlichen Ansichten und Schnittdarstellungen, während
Fig.11,12 und 13
eine dritte Ausführungsform des Vorzerkleinerungsmesserwerks in entsprechend unterschiedlichen Ansichten wiedergeben.
Several advantageous exemplary embodiments of the invention are shown in the drawings. Show
Fig. 1
the only area of the garden shredder of interest here in a vertical section,
Fig. 2
the likewise partially cut top view of the chopper of Fig.1,
Fig. 3,4,5 and 6
a preferred embodiment of the new pre-shredding knife with filler in different views and in section,
Fig. 7,8,9 and 10
another embodiment of the knife mechanism in corresponding different views and sectional views, while
Fig. 11, 12 and 13
reproduce a third embodiment of the pre-shredding knife mechanism in correspondingly different views.

Der in den Fig.1 und 2 nur ausschnittweise dargestellte Gartenhäcksler ist mit einem Messergehäuse 1 versehen, das auf einem den Antriebsmotor 2 samt Getriebe 3 tragenden Gestell 4 angeordnet ist, das teilweise auch den Auswerferraum 5 umgibt. Im Messergehäuse 1 ist die durch den Motor 2 über das Getriebe 3 und die Welle 6 umlaufend anzutreibende Messerträgerscheibe 7 vorhanden, die mit über ihren Umfang verteilt angeordneten, radial verlaufenden Durchtrittsschlitzen 8 und in Umlaufrichtung 9 dahinter angeordneten Flachmessern 10 versehen ist. Auf der Messerträgerscheibe 7 sind in deren zentralem Bereich die Vorzerkleinerungsmesser 11 in Gestalt zweier aufrecht und oben nach innen gebogener Messerflügel 11',11'' vorhanden, die mit in Umlaufrichtung jeweils vorn liegenden, entsprechend schräg verlaufenden Schneidkanten 11''' versehen sind. Zwischen den Messerbalken 11',11'' ist ein mitumlaufendes, der Spandicken-Begrenzung dienendes Füllstück F vorgesehen, das weiter unten noch näher beschrieben wird.The garden shredder shown only in part in FIGS. 1 and 2 is provided with a knife housing 1, which is arranged on a frame 4 carrying the drive motor 2 together with the gear 3, which also partially surrounds the ejector chamber 5. In the knife housing 1, the knife carrier disk 7, which is to be driven in rotation by the motor 2 via the gear 3 and the shaft 6, is provided, which is provided with radially extending passage slots 8 arranged over its circumference and flat knives 10 arranged behind it in the direction of rotation 9. In the central area of the knife carrier disk 7 there are the pre-comminution knives 11 in the form of two upright and upwardly curved knife blades 11 ', 11' ', which are provided with correspondingly obliquely running cutting edges 11' '' in the direction of rotation. Provided between the cutter bars 11 ', 11' 'is a circumferential filler F which serves to limit the chip thickness and which is described in more detail below.

Oberhalb der Messerträgerscheibe 7 und auch ihrer Vorzerkleinerungsmesser 11 ist in entsprechenden Aussparungen 12 des Gestells 4 ein Widerlagereinsatz 13 mit seinen beidseitigen Befestigungsfüßen 13' auswechselbar befestigt. Dieser Widerlagereinsatz 13 besteht aus einstückigem, entsprechend geformtem Eisen- bzw. Stahlblech. Dieses unterteilt den oberhalb der umlaufenden Messerträgerscheibe 7 vorhandenen Bereich in einen über den Aufgabetrichter 14 mit dem zu häckselnden Gartenabfallgut unmittelbar zu beschickenden Zufuhrbereich 15 und in den mit dem Auswerferraum 5 verbundenen Auswerferbereich 16. Wie die Fig.1 und 2 zeigen, besitzt der Widerlagereinsatz 13 einen bündig mit seinen Befestigungsfüßen 13' verlaufenden flachen Stegteil 13'', der nahe an die Umlaufbahn der Flachmesser 10 heranreicht, und eine demgegenüber abgewinkelte Schrägfläche 13''', die in ihrem die Vorzerkleinerungsmesser 11 umgebenden Bereich eine torförmige Aussparung 17 aufweist, deren eine Torflanke 17' eine innere Gegenschneide bildet, die mit den Schneidkanten 11''' der Vorzerkleinerungsmesser zusammenwirkt. Zwischen dem mehrfach abgewinkelt verlaufenden Schrägbereich 13IV und dem Stegteil 13'' besitzt der Widerlagereinsatz 13 eine untere Gegenschneide 18, die im wesentlichen radial verläuft, dabei jedoch tangential zum Hüllkreis der Vorzerkleinerungsmesser 11 gerichtet verläuft, um im Zusammenwirken mit den auf der Messerträgerscheibe vorhandenen Flachmessern 10 das im Zufuhrraum 15 auftreffende, zu häckselnde Gartenabfallgut, insbesondere auch dickeres Astmaterial, mit einziehender, nach innen gerichteter Schnittwirkung zu beaufschlagen.Above the knife carrier disk 7 and also its pre-comminution knife 11, an abutment insert 13 with its two-sided fastening feet 13 'is exchangeably fastened in corresponding recesses 12 in the frame 4. This abutment insert 13 consists of a one-piece, correspondingly shaped Iron or steel sheet. This divides the area above the revolving knife carrier disk 7 into a feed area 15 to be fed directly via the feed hopper 14 with the garden waste to be chopped and into the ejector area 16 connected to the ejector space 5. As shown in FIGS. 1 and 2, the abutment insert 13 has a flat web part 13 '' which runs flush with its fastening feet 13 'and which comes close to the orbit of the flat knives 10, and an inclined surface 13''', which is angled in relation thereto and has a gate-shaped recess 17 in its area surrounding the pre-comminution knives 11, one of which Gate flank 17 'forms an inner counter-cutting edge which interacts with the cutting edges 11''' of the pre-shredding knife. Between the multiple angled oblique area 13 IV and the web part 13 '', the abutment insert 13 has a lower shear bar 18, which runs essentially radially, but runs tangentially to the enveloping circle of the pre-shredding knives 11, in order to interact with the flat knives present on the knife carrier disk 10 to act on the garden waste, which is to be chopped, in the feed space 15, in particular also thicker branch material, with retracting, inwardly directed cutting action.

Der aus dünnwandigem Blech oder auch aus Kunststoff bestehende Aufgabe- oder Fülltrichter 14 besitzt ein schräg aufrecht verlaufendes Außenrohr 19, das über den mit ihm fest verbundenen Fußflansch 20 leicht auswechselbar auf dem Messergehäuse 1 bzw. Gestellgehäuse 4 aufliegt. Die am Außenrohr 19 vorhandene senkrechte Trennwand 21 liegt am oberen Teil des abgewinkelten Widerlagereinsatzes 13 an und sorgt so für eine untere Abschottung des Zufuhrtrichters 14 gegenüber dem Auswerferraum 5.The feed or filling funnel 14, which is made of thin-walled sheet metal or plastic, has an obliquely upright outer tube 19 which rests on the blade housing 1 or frame housing 4 in an easily replaceable manner via the base flange 20 which is firmly connected to it. The vertical partition 21 present on the outer tube 19 abuts the upper part of the angled abutment insert 13 and thus ensures that the feed hopper 14 is sealed off from the ejector chamber 5.

Die Messerträgerscheibe 7 ist mit vier über ihren Umfang gleichmäßig verteilt angeordneten radialen Durchtrittsschlitzen 8 und den in Umlaufrichtung 9 dahinter sitzenden Flachmessern 10 versehen, die in ausgeprägten Vertiefungen der Messerträgerscheibe 7 auswechselbar befestigt sind. Die Messerschneiden der Flachmesser 10 bestehen jeweils aus mehreren kurzen Messerschneidabschnitten 10',10'',10''', die sich über einen weniger als die Hälfte betragenden Teillängenbereich der mit ihnen zusammenwirkenden unteren Gegenschneide 18 am Widerlagereinsatz 13 erstrecken, höhenmäßig unterschiedlich liegen und wovon mindestens einige dieser Messerschneidabschnitte radial versetzt zueinander angeordnet sind. Auf diese Weise können auch von starkem Astmaterial anstatt breiter Scheiben schmale Streifen abgehobelt werden, was zur Schonung des Messerwerks beiträgt.The knife carrier disk 7 is provided with four radial passage slots 8 arranged uniformly distributed over its circumference and the flat knives 10 located behind it in the direction of rotation 9, which are exchangeably fastened in pronounced recesses in the knife carrier disk 7. The knife edges of the flat knives 10 each consist of several short knife cutting sections 10 ′, 10 ″, 10 ″ ″, which extend over a partial length range of less than half of the lower counter cutting edge 18 cooperating with them on the abutment insert 13, are of different heights and at least some of which are arranged radially offset from one another . In this way, narrow strips can be cut from thick branches instead of wide discs, which helps to protect the knife mechanism.

Das Vorzerkleinerungsmesserwerk ist vorzugsweise von der in den Fig.3 bis 6 dargestellten Beschaffenheit. Hiernach bestehen die Vorzerkleinerungsmesser 11 aus zwei sich diametral gegenüberstehenden Messerflügeln 11',11'', die in ihrem oberen Bereich dachförmig aneinanderliegend abgebogen sind und im Dachfirst vorzugsweise durch die Schweißnaht 22 fest miteinander verbunden sind. Die Vorzerkleinerungs-Messerflügel werden dabei von den entsprechend gebogenen Schenkeln eines im wesentlichen U-förmigen Messerbalkens gebildet, der über seinen Steg 11IV zusammen mit dem darauf aufliegenden Füllstück F zentral auf der Messerträgerscheibe 7 befestigt, insbesondere verschraubt ist. Das Füllstück F besteht aus einem beidseitig abgeflachten, leicht drehversetzt zwischen den senkrechten Abschnitten 11V der Messerflügel 11',11'' angeordneten, sargförmigen Füllkörper, der in seinem oberen, in den dachförmigen Bereich der Messerflügel 11', 11'' teilweise hineinragenden Teil entsprechend stärker kegelstumpfartig abgeschrägt ausgebildet ist. Wie die den Schnitt nach der Linie IV-IV wiedergebende Fig.4 zeigt, liegen zwischen dem Füllkörper F und den beiden Messerflügeln 11',11'' Spandurchtrittsschlitze 23, die sich in zur Umlaufrichtung 24 der Vorzerkleinerungsmesser entgegengesetzter Richtung erweitern.The pre-shredding knife mechanism is preferably of the type shown in FIGS. 3 to 6. According to this, the pre-shredding knives 11 consist of two diametrically opposed knife blades 11 ′, 11 ″, which are bent in a roof-like manner in their upper region and are preferably firmly connected to one another in the roof ridge by the weld seam 22. The pre-shredding knife blades are formed by the correspondingly bent legs of an essentially U-shaped knife bar, which is fixed, in particular screwed, via the web 11 IV together with the filler F lying thereon, centrally on the knife carrier disk 7. The filler F is flattened on both sides of a slightly rotationally offset between the vertical portions 11 V of the knife blades 11 arranged ', 11'', coffin-shaped filling body, the upper his, 11', 11 '' is partially protruding into the roof-shaped region of the blade wing part is correspondingly more conically beveled. As shown in FIG. 4, which shows the section along line IV-IV, there are chip passage slots 23 between the filler body F and the two knife blades 11 ′, 11 ″, which widen in the opposite direction to the direction of rotation 24 of the pre-comminution knife.

In den Fig.3 und 4 ist strichpunktiert auch der Widerlagereinsatz 13 mit seiner torartigen Aussparung 17 und seiner mit den Vorzerkleinerungsmessern 11 zusammenwirkenden inneren Gegenschneide 17' angedeutet. Durch die umlaufenden Vorzerkleinerungsmesser 11 wird im Zusammenwirken mit der inneren Gegenschneide 17' und der Kontur des Füllkörpers F das zu häckselnde Gut jedenfalls am Fußschnittkreis 25 mit der Spandicke d zerspant, während im darüber gelegenen Schnittbereich der Vorzerkleinerungsmesser-Schneidkanten 11''' die erzielbare Spandicke variiert und wesentlich auch von der Drehzahl der umlaufenden Messer 11 und auch der Antriebsleistung abhängt.In FIGS. 3 and 4, the abutment insert 13 with its gate-like recess 17 and its inner shear 17 'interacting with the pre-comminution knives 11 is also indicated by dash-dotted lines. The circumferential pre-shredding knife 11, in cooperation with the inner shear bar 17 'and the contour of the filling body F, in any case the material to be chopped at the root cutting circle 25 with the chip thickness d machined, while in the overlying cutting area of the pre-shredding knife cutting edges 11 '''the achievable chip thickness varies and also essentially depends on the speed of the rotating knives 11 and also the drive power.

Um jedenfalls im oberen, durch den Füllkörper F nicht ausgefüllten Freiraum 26 in größerem Umfang auch dünneres Ast- und Zweigmaterial noch besser zerkleinern zu können, sind die Vorzerkleinerungsmesser 11',11'' in ihrem in Umlaufrichtung 24 rückwärtigen Bereich mit Aussparungen 27,27' versehen, von denen die oberste 27' aus einer frei in die Oberkante des Vorzerkleinerungsmessers 11'' auslaufenden Abflachung besteht. Durch die sich entgegengesetzt zur Umlaufrichtung 24 erweiternden Schlitze 23 zwischen dem Füllkörper F und den Vorzerkleinerungsmessern 11 wird ein guter Spandurchtritt bzw. -austritt ermöglicht, ohne daß daran das Vorhandensein des Füllkörpers F hinderlich wäre. Durch die dachförmige Ausführung der beiden Vorzerkleinerungs-Messerflügel 11',11'' wird der Selbsteinzug des Häckslers an dieser Stelle verbessert. Dennoch kann es aber infolge der Anwesenheit des Füllkörpers F auch bei niedrigen Drehzahlen des umlaufenden Messerwerks hier nicht zu einem Blockieren durch stärkeres Astmaterial kommen.In order to be able to shred even thinner branch and branch material to a greater extent in the upper free space 26, which is not filled by the packing F, the pre-shredding knives 11 ', 11' 'are in their rear area in the circumferential direction 24 with recesses 27, 27'. provided, of which the uppermost 27 'consists of a flat that runs freely into the upper edge of the pre-shredding knife 11' '. The slots 23, which widen in the direction opposite to the direction of rotation 24, between the filling body F and the pre-comminution knives 11 enable good chip passage or exit without the presence of the filling body F being an obstacle. The roof-shaped design of the two pre-shredding knife blades 11 ', 11' 'improves the self-retraction of the chopper at this point. Nevertheless, due to the presence of the packing F, there can be no blockage due to stronger knot material even at low speeds of the rotating knife mechanism.

Über die Schraubbefestigungsbohrungen 28 im Füllkörper F kann letzterer zusammen mit dem die Messerflügel 11', 11'' aufweisenden, im wesentlichen U-förmig abgewinkelten Messerbalken auf der Messerträgerscheibe 7 in einfacher Form auswechselbar befestigt werden.Via the screw fastening bores 28 in the filler body F, the latter can be exchangeably fastened to the knife carrier disk 7 in a simple form together with the knife bar 11 ', 11' 'having an essentially U-shaped angled knife bar.

Bei dem in den Fig.7 bis 10 dargestellten Vorzerkleinerungs-Messerwerk bestehen die Vorzerkleinerungsmesser aus zwei sich diametral gegenüberstehenden, senkrecht verlaufenden Messerflügeln 31', die von den beiden Schenkeln eines U-förmig gebogenen Messerbalkens 31 gebildet sind. Das Füllstück besteht hier aus einem beidseitig abgeflachten, leicht drehversetzt gegenüber den Messerflügeln 31' zwischen ihnen angeordneten Zylinderkörper F', der sich über nahezu die volle Höhe der beiden Messerflügel 31' erstreckt. Diese sind oben durch ein Querjoch 32 fest miteinander verbunden. Zwischen dem zylindrischen Füllkörper F' und den Messerflügeln 31' sind auch hier Spandurchtrittsschlitze 23 vorhanden, die sich in zur Umlaufrichtung 24 entgegengesetzter Richtung erweitern, so daß auch hier für einen guten Spandurchtritt gesorgt ist. In diesem Fall ist eine gleichbleibende Spandicke d über die gesamte Höhe des Vorzerkleinerungsmesserwerks zu erzielen.7 to 10, the pre-comminution knives consist of two diametrically opposed, vertically extending knife blades 31 ', which are formed by the two legs of a U-shaped curved cutter bar 31. The filler piece here consists of a cylinder body F 'flattened on both sides and slightly rotatably offset relative to the knife blades 31', which extends over almost the full height of the two knife blades 31 '. These are firmly connected to one another at the top by a transverse yoke 32. There are also between the cylindrical filler F 'and the knife blades 31' here there are chip passage slots 23 which widen in the direction opposite to the direction of rotation 24, so that here too a good chip passage is ensured. In this case, a constant chip thickness d can be achieved over the entire height of the pre-shredding cutter.

Ähnliche Verhältnisse liegen auch bei der in den Fig.11 bis 13 dargestellten Ausführungsform vor. Hier ist ein wiederum zentral auf der Messerträgerscheibe 7 schraubzubefestigender, im wesentlichen zylindrisch gestalteter, einteiliger Tragkörper 35 vorgesehen, der mit einem oberen und unteren Randflansch 36 bzw. 37 versehen ist. Der zwischen den beiden Flanschen 36,37 gelegene schmälere Bereich des Tragkörpers bildet hier das Füllstück F'', das wegen seiner beidseitigen Abflachungen 40,40' wiederum drehversetzt zu den an den beiden Randflanschen 36,37 über die Schrauben 38 befestigten Vorzerkleinerungsmessern 39 liegt. Zu deren Befestigung ist der Tragkörper 35 im Bereich seiner beiden Randflansche 36,37 mit entsprechenden seitlichen Abflachungen 36' versehen. Die Vorzerkleinerungsmesser 39 sind hier sowohl mit vorderen als auch rückwärtigen Schneidkanten 39',39'' versehen, so daß sie als Wendemesser benutzt werden können. Auch in diesem Fall ist durch die gegenüber den Vorzerkleinerungsmessern 39 drehversetzte Lage des das Füllstück F'' bildenden mittleren Bereichs des Tragkörpers 35 für eine entsprechende rückwärtige Erweiterung der Spandurchtrittsschlitze 23 gesorgt. Ebenfalls kann hier über praktisch die ganze Höhe des Vorzerkleinerungsmesserwerks die Spandicke d erzielt werden, so daß es auch in diesem Fall zu einer wirksamen Zerkleinerung des aufgegebenen Häckselguts an dieser Stelle kommmt und Blockierungen durch allzu starkes Astmaterial verhindert werden.Similar relationships also exist in the embodiment shown in FIGS. 11 to 13. Here, a substantially cylindrical, one-piece support body 35, which is again screw-fastened centrally on the knife carrier disk 7 and is provided with an upper and lower edge flange 36 and 37, is provided. The narrower region of the supporting body located between the two flanges 36, 37 here forms the filler F ″, which, because of its flats 40, 40 ′ on both sides, is in turn offset from the pre-comminution knives 39 fastened to the two edge flanges 36, 37 by means of the screws 38. To secure it, the support body 35 is provided in the region of its two edge flanges 36, 37 with corresponding lateral flats 36 '. The pre-shredding knives 39 are provided here with both front and rear cutting edges 39 ', 39' ', so that they can be used as turning knives. In this case too, the position of the central region of the support body 35 forming the filling piece F ″, which is offset in relation to the rotary comminution knives 39, ensures a corresponding rearward expansion of the chip passage slots 23. Likewise, the chip thickness d can be achieved here over practically the entire height of the pre-comminution knife mechanism, so that in this case there is also an effective comminution of the chopped material at this point and blockages caused by excessively strong knot material are prevented.

Claims (10)

  1. Garden shredder with a blade housing (1) disposed on a stand (4) supporting the driving motor (2) and a loading hopper (14) and surrounding a lower ejector chamber (5), in which blade housing is provided a blade carrying disc (7) to be driven circling about a substantially vertical axis, which disc is provided with substantially radially extending through slits (8), flat blades (10) disposed above them in a plane blade manner, and centrally disposed upright preliminary shredding blades (11), and wherein, furthermore, in the blade housing (1) an abutment insert (13) is provided which has a lower counter blade (18) cooperating with the flat blades (10) and a door-like recess (17) extending over the preliminary shredding blades (11) and comprising an inner counter blade (17') cooperating therewith, wherein in the intermediate space between the preliminary shredding blades (11) is disposed a filling piece (F) filling at least the lower region thereof and serving to limit the depth of cut, and between the filling piece and the preliminary shredding blades (11) through cutting slits (23) are provided which extend in the direction opposite to the circling direction (9) of the preliminary shredding blades, characterised in that the preliminary shredding blades consist of two diametrally opposed blade arms (11', 11'') which are bent in a roof-like manner in their upper region, and the filling piece consists of a coffin-shaped filling body (F) flattened at either side and disposed in a slightly rotationally offset manner between the vertical portions (11V) of the blade arms (11', 11''), which filling body extends predominantly in its upper part, partially protruding into the roof-shaped region of the blade arms (11', 11''), in a correspondingly tapering pared manner (Figures 3 to 6).
  2. Garden shredder according to claim 1, characterised in that the preliminary shredding blade arms (11', 11'') are formed by the correspondingly curved limbs of a substantially U-shaped blade carrying rail, which is fixed, in particular screwed, by means of its cross piece (11IV), together with the filling body (F) laying thereon, centrally onto the blade carrying disc (7) (Figures 3 to 6).
  3. Garden shredder according to one of claims 1 to 2, characterised in that the preliminary shredding blades (11, 11'') are provided, in their region at the rear in the circling direction, with the recesses (27, 27') permitting the cutting of thinner branches (Figures 3, 5, 6).
  4. Garden shredder according to claim 3, characterised in that the recesses (27, 27') are provided in the upper region of the preliminary shredding blades (11', 11''), and the uppermost recess consists of a flattened area (27') extending openly to the upper edge of the preliminary shredding blade (11', 11'') (Figures 5, 6).
  5. Garden shredder according to claim 1, characterised in that the preliminary shredding blades (31' or 39) are disposed in a vertically through-going manner and parallel to each other, wherein the intermediate space lying between them is filled throughout its height by the filling piece (F' or F'') including the through cutting slits (23) lying at either side thereof (Figures 7 to 13).
  6. Garden shredder according to claim 5, characterised in that the preliminary shredding blades consist of two diametrally opposed blade arms (31') which are formed by the two limbs of a blade carrying rail (31) which is bent in a U shape, wherein the filling piece consists of a cylindrical body (F') which is flattened at both sides and is slightly rotationally offset with respect to the blade arms (31') and disposed between them, and which extends over almost the whole height of the two blade arms (31') which are firmly connected to each other at the top by means of a transverse yoke (32) (Figures 7 to 10).
  7. Garden shredder according to claim 5, characterised in that a substantially cylindrical support body (35) is provided, which is provided with an upper and lower flange (36 and 37) flattened at both sides for two preliminary shredding blades (39) to be fixed thereto at the upper and lower ends, which support body in its narrower region lying between the two flanges (36, 37) forms the filling piece (F'') and is provided in this case with flattened areas (40) at either side, which, in order to form the correspondingly extending through cutting slits (23), lie in a rotationally offset manner with respect to the flattened areas (36') provided at both sides on the flanges (36, 37) (Figures 11 to 13).
  8. Garden shredder according to claim 7, characterised in that the preliminary shredding blades attached at one side to the support body (35) are formed as turning blades (39) provided with front and rear cutting edges (39' 39'') (Figures 11, 12).
  9. Garden shredder according to any of claims 1 to 8, characterised in that the abutment insert (13) cooperating with the preliminary shredding blades and the filling piece housed between them is mounted in an exchangeable manner in the stand (4) (Figure 2).
  10. Garden shredder according to any of claims 1 to 9, characterised in that the blade cutting edges of the flat blades (10) disposed in a plane blade manner on the blade carrying disc (7) consist of short blade cutting edge portions (10', 10'', 10''') lying offset to each other with respect to height and which extend over a partial length region, amounting to less than half, of the lower counter blade (18) cooperating therewith, on the abutment insert (13) and whereof at least some of these blade cutting edge portions are disposed radially offset with respect to each other (Figure 2).
EP92102030A 1991-03-27 1992-02-07 Garden waste shredder with a blade housing containing rotating, powered flat blades and pre-shredding blades Expired - Lifetime EP0505702B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4110038 1991-03-27
DE4110038A DE4110038A1 (en) 1991-03-27 1991-03-27 GARDEN CHOPPER WITH KNIFE HOUSING AND FLAT TO BE DRIVED IN ITS ROUND AND PRESIZING KNIVES

Publications (2)

Publication Number Publication Date
EP0505702A1 EP0505702A1 (en) 1992-09-30
EP0505702B1 true EP0505702B1 (en) 1995-08-09

Family

ID=6428312

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92102030A Expired - Lifetime EP0505702B1 (en) 1991-03-27 1992-02-07 Garden waste shredder with a blade housing containing rotating, powered flat blades and pre-shredding blades

Country Status (4)

Country Link
EP (1) EP0505702B1 (en)
AT (1) ATE126099T1 (en)
DE (2) DE4110038A1 (en)
ES (1) ES2077259T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4329799A1 (en) * 1993-09-03 1995-03-09 Lescha Maschf Gmbh Device for chopping up garden waste
DE9414619U1 (en) * 1994-09-09 1994-11-17 Viking-Umwelttechnik GmbH, Kufstein Device for shredding garden waste
CN102615330A (en) * 2012-03-09 2012-08-01 浙江金固股份有限公司 Tool rest of wheel slag planing machine
CN114130495A (en) * 2021-10-26 2022-03-04 枣庄市瑞隆机械制造有限公司 Two-stage crushing sand making machine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175313B1 (en) * 1984-09-19 1989-04-26 Josef Scheppach Maschinenfabrik GmbH &amp; Co. Waste comminuter
DE3621418A1 (en) * 1986-06-26 1988-01-14 Lescha Maschf Gmbh DEVICE FOR CHOPPING GARDEN WASTE
EP0416315B1 (en) * 1989-09-02 1994-11-30 SABO-Maschinenfabrik GmbH Shredder for comminuting garden waste with cutting device

Also Published As

Publication number Publication date
DE4110038A1 (en) 1992-10-01
DE59203158D1 (en) 1995-09-14
ES2077259T3 (en) 1995-11-16
ATE126099T1 (en) 1995-08-15
EP0505702A1 (en) 1992-09-30

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