DE20102864U1 - Garden shredder - Google Patents

Description

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TERMEER STEINMEISTER & PARTNER GBR PATENTANWÄLTE - EUROPEAN PATENT ATTORNEYS

Dr. Nicolaus ler Meer, Dipl.-Chem. Peter Urner, Dipl.-Phys. Gebhard Merkle, Dipl.-Ing. (FH) Mauerkircherstrasse 45 D-81679 MUNICH Helmut Steinmeister, Dipl.-Ing. Manfred Wiebusch

Artur-Ladebeck-Strasse D-33617 BIELEFELD

51

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St/ec/bf.

19.2.2001

Atika Machine Factory

Wilhelm Pollmeier GmbH & Co.

Schinkelstr. 97

59227 Ahlen

GARDEN SHREDDER

Aüka Maschinenfabrik ." I 'II .* * 1&tgr;&idiagr;§&Oacgr;1 £01/G 19.2.2001

GARDEN SHREDDER

The invention relates to a garden shredder with a filling funnel, a blade mechanism rotatable by a shaft at the inner end of the filling funnel and an ejection downstream of the blade mechanism.

Garden shredders of this type are known in various designs. They are used privately and commercially to shred garden waste, especially in the form of twigs and more or less thick branches, which are chopped into chips that rot more easily. Garden shredders of this type usually consist essentially of a feed hopper that is vertical or inclined downwards in the operating position, through which the garden waste is pushed, a blade mechanism at the inner or lower end of the feed hopper that can be rotated by a shaft that enters from the outside, and an ejector downstream of the blade mechanism. Blade mechanisms come in different forms, both as blades that extend freely from the shaft and in the form of disks on which the blades are arranged. In both designs, the cutting edges extend essentially over the entire radius of the blade mechanism. This means that all the material to be cut must be cut in one cut. This requires a high level of power and leads to a strong recoil, which places a considerable strain on the entire mechanics of the garden shredder and results in corresponding noise.

The invention is based on the object of creating a garden shredder of the above type with a blade mechanism which enables a largely uniform distribution of the cutting power over the entire cycle of rotation of the blade mechanism.

This object is achieved in a garden shredder of the above type according to the invention in that the blade mechanism comprises at least two blades at different radial distances from the axis of rotation of the shaft.

Since the individual blades of the blade mechanism according to the invention are effective in different radial positions and only have to cut a part of the material to be cut, a uniform,

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Atika Maschinenfabrik _# °* J* «* j ,· *5TIp01001/G 19.2.2001

Evenly distributed load on the blades and the blade mechanism, resulting in low power consumption, reduced recoil and low noise pollution.

Preferably, the blades are located on a substantially circular disk, and in the direction of rotation in front of the cutting edges of the blades there are passages for shredded material in the disk. The shreds pass through these passages to the downstream side of the disk and from there into the discharge.

The knives can be arranged offset over the radius of the disc so that the cutting edges cover substantially the entire radius or even overlap more or less.

Furthermore, the blades are preferably also arranged distributed in the circumferential direction, so that the recoil absorbed when they hit the material to be cut is distributed essentially over the entire rotation of the shaft.

The blades are preferably detachably mounted on the disc so that they can be easily exchanged and replaced with new or sharpened blades when they become damaged or blunt. The blades are preferably essentially square reversible blades that can be used four times by repositioning.

Ejector wings can also be formed on the disc, which throw the chips in the direction of the ejection. These ejector wings are preferably made of the material of the disc itself, from which they are made by carving and bending.

In the following, a preferred embodiment of the invention is explained in more detail with reference to the accompanying drawing.

The only figure is a perspective view of a blade mechanism of a garden shredder according to the invention.
35

Atika Maschinenfabrik .* I * II ·' * iTI&Ol /&iacgr;()1 /G February 19, 2001

Garden shredders are known in many different designs, so that only the special features of the blade mechanism will be discussed here. The blade mechanism has a substantially circular disk 10 as a carrier, in particular made of steel.

The disk 10 has a concentric opening 12 which serves to accommodate a knife shaft (not shown) for rotating the disk. On the upper surface of the disk 10, which is visible in the drawing, there are two knives 14, 16 in positions which are essentially diametrically opposed to one another and are otherwise radially offset from the geometric axis 18 of the shaft (not shown). The knives 14, 16 are formed by essentially square reversible knives in the form of embossed knives, which have cutting edges on all four edges (not shown), and can be used four times, the raised cutting edges of which are designated 20, 22. The knives are held detachably on the surface of the disk 10 by central bolts 24, 26.

The direction of rotation of the disk 10 or the blade mechanism is indicated by an arrow 28. The disk therefore rotates clockwise, relative to the drawing. The blades 14, 16 rise slightly in the direction of rotation relative to the surface of the disk 10, as can be seen from the drawing, so that the cutting edge leading in the direction of rotation is at a distance from the surface of the disk. In front of this leading cutting edge there are passages 30, 32 in the disk.

When the clippings (not shown) fed into the garden shredder reach the surface of the disc 10, they are caught in different radial positions by the blades 14, 16 and divided into chips, which pass through the passages 30, 32 to the lower side of the disc, which is the downstream side during operation. In this area below the disc there is an ejector through which the chips can exit.

To accelerate this exit, a vortex is generated on the underside of the disc with the help of ejector blades 34,36. This vortex captures the chips passing through the openings 30,32 and directs them to the not shown

Atika Machine Factory

19.2.2001

provided ejectors in the peripheral area of the disk. These ejector wings 34,36 can be specially attached parts or can be cut out of the material of the disk 10 and bent out.

When the blades 14,16 have become blunt, they can be rotated three times by 30° each and reattached before they need to be sharpened or replaced.

Claims (9)

1. Garden shredder with a feed hopper, a blade mechanism ( 10 , 14 , 16 ) rotatable by a shaft at the inner end of the feed hopper and an ejection downstream of the blade mechanism, characterized in that the blade mechanism comprises at least two blades ( 14 , 16 ) at different radial distances from the axis of rotation ( 18 ) of the shaft. 2. Garden shredder according to claim 1, characterized in that the blades ( 14 , 16 ) are arranged on a substantially circular disk ( 10 ), and that passages ( 30 , 32 ) for cuttings are provided in the disk in front of the cutting edges in the direction of rotation. 3. Garden shredder according to claim 1 or 2, characterized in that the blades ( 14 , 16 ) are arranged offset over the radius of the disc ( 10 ) such that the cutting edges cover substantially the entire radius. 4. Garden shredder according to claim 3, characterized in that the cutting edges at least partially overlap each other with respect to the radius of the disc ( 10 ). 5. Garden shredder according to one of the preceding claims, characterized in that the blades ( 14 , 16 ) are arranged offset in the circumferential direction of the disc ( 10 ). 6. Garden shredder according to one of the preceding claims, characterized in that the blades ( 14 , 16 ) are detachably mounted on the disc ( 10 ). 7. Garden shredder according to claim 6, characterized in that the knives are essentially square reversible knives which can be used four times by repositioning. 8. Garden shredder according to one of the preceding claims, characterized in that ejector wings ( 34 , 36 ) are arranged on the disc ( 10 ). 9. Garden shredder according to claim 8, characterized in that the ejector wings ( 34 , 36 ) are made on the circumference of the disc by slitting and bending the material of the disc.