DE20300109U1 - Chopping device for garden rubbish has vaned wheel installed in outlet channel, with rotational axis orientated at angle to direction of movement of chopped material, and which generally fills out cross section of outlet channel - Google Patents

Abstract

The chopping device for garden rubbish has a vaned wheel (6) installed in the outlet channel (5), with its rotational axis (7) orientated at an angle to the direction of movement of the chopped material, and which generally fills out the cross section of the outlet channel. The cross section of the outlet channel housing the vaned wheel is sized in such a way that reaching into the outlet channel, along the vaned wheel and up to the chopping tool (4) is prevented.

Description

Cramer GmbH & Co. KG,
Reimersstrasse 36 - 40, 26789 Leer

"Crushing device with impeller" 5

The innovation relates to a shredding device according to the preamble of claim 1.

Such shredding devices in the form of chippers are used in practice for private and commercial applications

known and work mostly satisfactorily.

The innovation is based on the task of improving a generic shredding device in such a way that it, while excluding misuse as far as possible,

can be operated easily and safely.

This object is achieved by a shredding device having the features of claim 1.

In other words, the innovation proposes to arrange an impeller in the outlet channel. While various intake elements can be provided in the filling channel to guide the material, i.e. upstream of the shredding tool, the aim in the design of the outlet channel is usually

se aimed at enabling the shredded material to be removed as freely and unhindered as possible. The outlet channel is therefore often referred to in practice as "ejection" or "ejection channel", since the speed imparted to the shredded material by the shredding tool

is to be used to discharge this shredded material, usually with the aid of gravity, from the shredding device.

Surprisingly, the innovation proposes to

The outlet channel can be designed as freely as possible by a

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The impeller is deliberately blocked because the impeller is supposed to fill the cross-section of the outlet channel to a large extent, whereby the impeller lets the material to be discharged through the outlet channel in portions, like a rotary valve. With the dimensions of the outlet channel that are usual in practice, a "large portion" is considered to be when 50% or more of the outlet cross-section is covered by the impeller. With small-sized outlet channels, a smaller coverage by the impeller can also be sufficient because in these cases the remaining free outlet cross-section is small enough to achieve the desired advantageous effect due to its - not relative, but absolute - dimensions:

This is because it prevents people from reaching into the outlet channel. If there is enough space to reach along the impeller to the shredding tool, the user is hindered to a considerable extent by the impeller, so that such misuse is generally too cumbersome for the user and, if the shredding tool needs to be cleaned or freed of stuck waste, the user will therefore be more inclined to open the housing of the shredding device in a planned, correct manner in order to access the shredding tool in this way.

Advantageously, the free cross-section that remains along the impeller in the outlet channel can be dimensioned so small that the aforementioned reaching in is not only awkward, but impossible and reliably excluded. As an example, a gap width of max. 30 mm can be maintained to achieve this. The applicable regulations, in particular national, international and industrial standards, teach the designer which dimensional conditions must be observed in order to reliably exclude the aforementioned reaching in.

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The impeller can advantageously be driven from the outside by means of an actuator, namely by the user, e.g. if a material jam in the outlet channel has jammed the impeller. Surprisingly, apart from this actuator for manual rotation by the user, the impeller does not need to be driven in most cases, because the impeller is set in rotation by the discharged material, so that a particularly simple and inexpensive construction is possible, whereby the clear cross-section within the outlet channel is reduced to the desired extent. This basically driveless design of the impeller also enables existing shredding devices to be retrofitted relatively easily.

In a modification of the example described above, it can also be provided to deliberately drive the impeller and in this way promote the transport of the shredded material, which can lead to a particularly trouble-free operation of the shredding device, since the drive enables self-cleaning or self-clearing of the outlet channel and thus the probability of a material jam can be reduced.

If a manual rotary actuation of the impeller is provided in order to drive it, for example, in the event of a material jam and thus to be able to convey the material jam out of the outlet channel, then any rotary lock can preferably also be designed to be releasable, which otherwise - during regular operation of the shredding device - limits the rotation of the impeller to a single direction of rotation. To release the material jam, a brief rotation of the impeller in the opposite direction of rotation can be advantageous if necessary. The rotary lock mentioned can be released, for example, by operating a second actuating element to release the lock in addition to the manual rotary drive, or in-

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which the drive actuator is actuated in a second direction of movement. For example, a crank or a handwheel can be provided which can be moved around an axis of rotation to rotate the impeller and which can be pushed or pulled in the axial direction to release the lock.

Advantageously, the shredded material can be guided within the outlet channel in such a way that it is fed to the impeller only on one side, so that in the case of a non-driven impeller the rotary movement is automatically caused by the shredded material hitting the impeller.

Examples of the innovation are explained in more detail below using purely schematic drawings. The

Fig. 1, 3 and 4 different embodiments of the innovation, and

Fig. 2 a detailed view of the embodiment of the

Fig.1.

Fig. 1 shows a shredding device 1 with an upright filling channel 2 that is open at the top, a slanting branch funnel 3 and a horizontally arranged shredding tool 4 that is designed as a blade disk that can rotate about a vertical axis. The shredded material is discharged into the open air through an outlet channel 5 that points diagonally downwards.

Within the outlet channel 5, an impeller 6 is provided which is freely rotatable about an axis of rotation 7, and wherein this axis of rotation 7 runs transversely to the longitudinal direction of the outlet channel 5.

Fig. 2 shows the outlet channel 5 of the shredding device 1 of Fig. 1. Within the outlet channel 5, the impeller 6 is indicated with its circular section indicated at 8 as the circumference of the impeller 6. The diameter of the impeller 6

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is dimensioned such that, depending on the position of the impeller 6, a free space of 27 to only 20 mm remains between the impeller 6 and the wall of the outlet channel 5, so that it is reliably impossible for a user to reach along the impeller 6 through the outlet channel 5 to the shredding tool 4. The six individual blades of the impeller 6 are designated 9 in Fig. 2.

In Fig. 3, a shredding device 1 in the form of a roller shredder is shown schematically. It has a shredder roller as the shredding tool 4, which rotates about a horizontal axis.

Downstream of the shredding tool 4, i.e. in the conveying direction of the material, is the outlet channel 5, wherein an impeller 6 with a total of six blades 9 is provided, which is freely rotatable about an axis of rotation 7 which, like the axis of the shredding tool 4, is aligned transversely to the outlet channel 5.

Compared to the position shown in Fig. 3, the free space between the individual blades 9 and the wall of the outlet channel 5 can only become smaller when the impeller 6 is rotating. Even in the position shown, this free space is so small that a user of the shredding device 1 cannot reach past the impeller 6 to the shredding tool 4 through the lower, free opening of the outlet channel 5.

Fig. 4 shows a shredding device 1 in which the filling channel 2 runs slightly obliquely. The shredding tool 4 is not a knife disk as in Fig. 1 or a shredder roller as in Fig. 3, but a hammer mechanism. Here too, however, the shredding tool 4 is followed by an outlet channel 5 in which an impeller 6 is arranged, the blades 9 of which define the clear cross section of the outlet channel 5.

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fill it so much and have such a close distance to the walls of the outlet channel 5 that the user's intervention in the outlet channel 5, and up to the shredding tool 4, is prevented.

Claims (6)

1. Shredding device for garden waste - such as a shredder -, with a filling channel for the garden waste, a shredding tool, and an outlet channel for the shredded material, characterized in that
that an impeller ( 6 ) is arranged in the outlet channel ( 5 ), the axis of rotation ( 7 ) of which is aligned at an angle to the direction of movement of the shredded material,
and which largely fills the cross-section of the outlet channel ( 5 ). 2. Shredding device according to claim 1, characterized in that the cross-section of the outlet channel ( 5 ) released by the impeller ( 6 ) is dimensioned such that reaching into the outlet channel ( 5 ), along the impeller ( 6 ) and up to the shredding tool ( 4 ), is excluded. 3. Shredding device according to claim 1 or 2, characterized in that the impeller ( 6 ) is only rotatable in a predetermined direction of rotation. 4. Shredding device according to one of the preceding claims, characterized in that the impeller ( 6 ) is rotatable by means of an actuating member which is arranged outside the outlet channel ( 5 ) and is accessible to the user. 5. Shredding device according to claims 3 and 4, characterized in that an actuating member is provided by means of which a lock limiting the direction of rotation of the impeller ( 6 ) can be released, such that when this actuating member is actuated, the impeller ( 6 ) can be rotated in both directions. 6. Shredding device according to one of the preceding claims, characterized by a guide member - such as a guide plate - arranged in the outlet channel ( 5 ), which is arranged between the shredding tool ( 4 ) and the impeller ( 6 ) in such a way that the shredded material is fed to the impeller ( 6 ) exclusively on one side.