Device for shredding herbs

Description

[0001] The invention relates to a device for shredding herbs, comprising a substantially cylindrical chamber for receiving and shredding herbs, wherein the chamber has an axis of rotation and is formed by at least a first chamber part and a second chamber part, which are rotatable relative to each other about the axis of rotation, wherein a support element projecting substantially axially into the chamber is arranged on one of the chamber parts and at least one support surface extending substantially axially is arranged on the other of the chamber parts, wherein the support element and the support surface overlap each other in a shredding area extending axially, wherein at least one shredding element projecting radially outwards is arranged on one side of the support element and at least one shredding element projecting radially inwards is arranged on the support surface in the shredding area.and wherein the comminution elements can be moved past each other by twisting the chamber parts, overlapping each other radially.

[0002] Spice mills are well-known devices for grinding plant materials. These mills grind hard materials, such as seeds, grains, bark fragments, or dried fruits, to a roughly predefined size.

[0003] For lighter plant materials, such as dried herbs, other devices are needed, namely devices suitable for breaking down plant materials by cutting or tearing. Such devices are often called herb mills, although the plant parts are not actually ground in the literal sense.

[0004] Currently, there are essentially two methods for shredding lightweight plant materials or herbs. The first method, primarily used in shredding devices for CBD or cannabis components, involves sharp-edged elements engaging a cutting chamber from above and below, into which the material to be shredded is placed beforehand. The sharp-edged elements are then twisted or rotated against or around each other, cutting or shredding the material. The disadvantage of this method is that material can fall into the cutting chamber only with difficulty, if at all. Variants with an integrated auger attempt to improve the flow of material, but the shape of the auger limits the maximum size of the unshredded material.

[0005] The second method, primarily used in herb mills for fresh herbs, utilizes a sharp-edged grinding disc at the base of the grinding device. Here, the material to be cut must be pressed against the grinding disc within the device so that the rotation of the disc (i.e., the grinding disc rubbing against the material pressed against it) can grind the material. This pressure is achieved either by augers or manually via a plunger, resulting in such devices having a rather complex design and also limiting the size of the material that can be processed without grinding.

[0006] Devices for crushing herbs are known, for example, from WO 2018 / 020785 A1, TWM 426376 U, CN 2023.

[0007] The invention is based on the objective of providing a device for chopping herbs of the aforementioned type that avoids the problems mentioned above as far as possible. In particular, a device for chopping herbs is to be provided that has a simple design and is suitable for easily and effectively chopping even larger or coarser material.

[0008] According to the invention, this problem is solved with a device for crushing herbs which has the features of claim 1.

[0009] Preferred and advantageous embodiments of the invention are the subject of the dependent claims.

[0010] According to the invention, the support element is shaped and projects into the chamber in such a way that the radial distance formed between the support element and the support surface can be changed at least over a section of the comminution area by twisting the chamber parts.

[0011] The support element projects axially into the chamber, i.e., it has a longitudinal extension running in the axial direction, is arranged with one end on the associated chamber part, and projects into the chamber with another, free end.

[0012] During one full rotation (360°) of the chamber sections relative to each other or around the axis of rotation, the shredding element(s) of the carrier element can move completely past the shredding element(s) of the carrier surface (or each carrier surface). Material taken into the chamber and located within the shredding zone while the shredding elements move past each other (and overlap) is shredded, torn, or cut by the shearing motion exerted by the cutting elements.

[0013] The radial distance between the support surface and the support element is defined as the shortest distance between the support surface and the surface of the support element facing the support surface in a radial plane perpendicular to the chamber's axis of rotation. The surface of the support element facing the support surface can vary when the chamber parts are rotated (e.g., if the support element does not have a round or oval cross-section in the region of the radial plane).

[0014] The radial distance is minimal when the comminution elements overlap (i.e., move past each other) and then increases and decreases during a full rotation (i.e., a full twist of the chamber parts relative to each other).

[0015] In other words, the radial distance between the support surface and the support element is smaller when the crushing elements of the support element point towards the support surface (first state) than when the crushing elements of the support element point away from the support surface (second state).

[0016] The radial distance is variable at least over (or in) a section of the comminution area, but preferably the distance is variable over the entire comminution area.

[0017] Within the scope of the invention, "axial" refers to a direction in the direction of the axis of rotation of the substantially cylindrical chamber. Similarly, "radial" refers to a direction normal to this axis of rotation. "Circular" within the scope of the invention means along or on a surface of the cylindrical chamber. Within the scope of the invention, the substantially circular (open or closed) end faces of the cylindrical chamber are considered the base faces of the chamber.

[0018] Since the radial distance between the support surface and the support element changes in the comminution device according to the invention, material to be cut can penetrate or fall into (or be "sucked in") the comminution area when the radial distance is increased, and is then clamped and comminuted when the radial distance is reduced.

[0019] In particular, a preferred embodiment of the invention is one in which the essentially cylindrical chamber is enclosed circumferentially and at least on a first base side by the chamber parts. The first chamber part enclosing the first base side has holes on the enclosed first base side through which the shredded material can fall out of the chamber. Slits or other forms of through-openings are also considered to be holes.

[0020] If the radial spacing is only variable over a section of the comminution area, this section extends from an end of the support element (preferably the free end) pointing away from the enclosed base towards the enclosed base. The section in which the radial spacing is variable can extend over at least one-third, preferably at least half, and in particular at least three-quarters of the comminution area.

[0021] The first chamber part can enclose the essentially cylindrical chamber circumferentially and at the first base. Alternatively, the first chamber part can enclose the chamber essentially only at the first base. The second chamber part can enclose the essentially cylindrical chamber only circumferentially, leaving the second base opposite the enclosed first base unenclosed. However, it is also possible for the second chamber part to enclose the chamber circumferentially and at the second base, or alternatively, for the second chamber part to enclose essentially only the second base.

[0022] Preferably, in an embodiment where the second base is unenclosed (i.e., the chamber is open on this side), the second chamber part has means, such as a thread, for (removably) attaching a container in an area adjacent to the second base. This container can serve as a storage container for herbs. In embodiments where the second base is also enclosed, the chamber itself serves as a storage container and can be opened, particularly at the non-perforated base.

[0023] Preferably, the chamber parts are arranged essentially side by side or one behind the other. However, within the scope of the invention, this does not necessarily mean that the chamber parts are arranged directly next to or behind one another (they can also be spaced apart). Furthermore, the chamber parts can overlap each other in the axial direction. The chamber parts can each consist of a single component or of several components that are detachably or permanently connected to one another.

[0024] It is preferred if the first chamber part is rotatably mounted on or in the second chamber part, or vice versa.

[0025] The first chamber part can essentially be a cap covering the first base and rotatably mounted on or within the second chamber part, which at least circumferentially encloses the chamber. It is also possible for each chamber part to circumferentially enclose a section of the chamber. It is also conceivable (though not preferred) that the chamber is circumferentially enclosed by a further (third) chamber part, and that the first and second chamber parts enclose the chamber only at its bases (in this case, too, the chamber parts are arranged side by side according to the invention, although not directly adjacent but spaced apart by the further chamber part). It is also possible for one of the chamber parts to be completely contained within the other chamber part.

[0026] The first base can be closed with a lid. For this purpose, a means (e.g., an annular projection) for attaching the lid can be provided on the first chamber section.

[0027] In a preferred embodiment, the support element is arranged, and in particular attached, to the enclosed first base side (i.e., to the chamber portion enclosing the first base side in the region of the first base side) and projects axially into the chamber from this side (with a free end). The support element thus projects towards the second base side of the essentially cylindrical chamber.

[0028] Preferably, the support element is arranged decentrally within the chamber, or the support element projects decentrally into the chamber in an axial direction. Within the scope of the invention, this means that the longitudinal axis of the support element (which runs along the longitudinal extent of the support element) is arranged offset from the axis of rotation of the chamber. Such an arrangement changes the radial distance when the chamber parts are rotated, since the support element essentially moves in a circular path around the axis of rotation and, when passing the support surface, comes closer to it than at any other point on the circular path. It is preferred if the support element is arranged on the first chamber part in the region of the closed base and projects from there towards the other base.

[0029] Within the scope of the invention, it can be provided that several support surfaces, each extending substantially in the axial direction and each with at least one comminution element, are arranged circumferentially on the other chamber part (i.e., on the chamber part where the support element is not located). The support surfaces are preferably substantially identical in design. The circumferential distribution of the support surfaces means that they are spaced apart from one another on an inner cylinder wall of the chamber. The support surfaces are preferably arranged rotationally symmetrically, so that there are equal distances between the support elements.

[0030] Implementations with multiple support elements are conceivable, although not preferred, in particular all of which are arranged decentrally (e.g. on the same circular path) on the perforated first base side.

[0031] In particular, embodiments in which the support element and / or the support surface, or possibly support surfaces (if several are present), each have several axially spaced-apart shredding elements are preferred within the scope of the invention. The shredding elements of the support surface(s) and the support element of such embodiments interlock when they are moved past one another, i.e., when at least one shredding element of the support surface is movable between two shredding elements of the support element and / or vice versa. Preferably, the shredding elements of the support surface(s) and the support element are always arranged alternately next to each other when overlapping or interlocking axially. Preferably, only a very small gap is formed between axially adjacent and overlapping shredding elements when the shredding elements interlock.

[0032] The support element and the support surface, or each of the support surfaces, can have the same number of comminution elements or a different number. The number of comminution elements between the support element and a support surface can differ, in particular, by one. For example, the support element and the support surface(s) each have three or four comminution elements. Alternatively, the support element might have three comminution elements and each support surface four, or the support element might have four comminution elements and each support surface three.

[0033] It is particularly preferred if the support element has essentially the shape of a cylinder. The support element can also be cut at an angle, thus having the shape of a cylinder cut at an angle. The angled surface lies essentially on the side of the cylinder that is free of the comminution elements (i.e., the cylinder is not angled on the side of the comminution elements, but on the opposite side – the back). The angled cylindrical shape causes the angled surface to face the support surface when the chamber parts are rotated relative to each other, thereby increasing or decreasing the radial distance between the support surface and the side of the support element facing the support surface, at least section by section. This also applies to a non-cylindrical support element (e.g.,(a prism-shaped support element with an oval, semicircular, rectangular, or otherwise shaped base) the support element can be chamfered in an analogous manner as described above.

[0034] Particularly preferred are embodiments in which the support element is a beveled cylinder arranged off-center on the first base side. In such devices, when the chamber parts are rotated relative to each other, a change (increase and subsequent decrease) in the radial distance occurs throughout the comminution area. Due to the bevel, this change is particularly pronounced at the end of the support element facing away from the perforated base side (i.e., at the free end of the support element). This creates a kind of funnel or suction effect towards the first base side (i.e., towards the holes from which the comminuted material can fall out of the chamber).

[0035] Within the scope of the invention, it can be provided that the support surface(s) is / are formed directly on the chamber part on which it is / are arranged. Alternatively, the support surface(s) can be formed on a component connected to this chamber part.

[0036] Preferably, the comminution elements are projections, in particular plate- or beam-shaped projections. Preferably, at least one of the comminution elements, or preferably some or even all of the comminution elements, has a cutting edge on a radially extending side.

[0037] In such embodiments with cutting edges on both the shredding element(s) on the support surface and the shredding element(s) on the support element, the cutting edges of overlapping shredding elements are preferably oriented in opposite directions. It is also possible that only the shredding element(s) of the support element or the support surface(s) has a cutting edge(s).

[0038] The invention provides that the chamber parts can be rotated relative to each other manually or electrically.

[0039] Further details, features and advantages of the invention will become apparent from the following description with reference to the accompanying drawings, in which preferred embodiments are illustrated. These show: Fig. 1 a top view of the device according to the invention in the direction of a rotation axis of a cylindrical chamber of the device, Fig. 2 a sectional view of the in Fig. 1 Figures 3 to 5 show highly simplified top views of a further embodiment of the device according to the invention along a section plane passing through the axis of rotation.

[0040] Fig. 1 Figure 1 shows the device 1 according to the invention for grinding herbs, which has a cylindrical chamber 2 with an axis of rotation R. The top view in Fig. 1 occurs in the direction of the rotation axis R.

[0041] Fig. 2 shows a cross-sectional view through the in Fig. 1 The illustrated embodiment of the device according to the invention, wherein the section plane II-II runs along the axis of rotation R.

[0042] The cylindrical chamber 2 is formed by a first chamber part 3 and a second chamber part 4, i.e. it is bounded by these chamber parts 3, 4 or at least partially enclosed by these chamber parts 3, 4.

[0043] The first chamber part 3 surrounds the chamber 2 circumferentially with a tubular first cylinder wall 6, and at a first base 5 with a circular closure plate 7. In the area of ​​the first base 5 (i.e., in the closure plate 7), the first chamber part 3 has holes 8. The first base 5 can therefore also be referred to as the perforated base 5, and the closure plate 7 as the perforated closure plate 7.

[0044] The device 1 according to the invention can have a cover (not shown) which can be attached or screwed onto the first chamber part 3 in the region of the first base 5, so that it is oriented essentially orthogonally to the axis of rotation R. In the illustrated embodiment, the cover can be placed on the first cylinder wall 6, which projects beyond the closure plate 7 and forms an annular projection 9 extending away from the first base 5.

[0045] The second chamber part 4 encloses the chamber 2 with a second cylindrical wall 11 only on its circumference, whereby the chamber 2 is not enclosed on its second base side 12.

[0046] The second cylinder wall 11 has a circumferentially outwardly directed step 13, so that it is divided into a wall section 14, which connects directly to the first cylinder wall 6 in the axial direction, and a plug-in section 15 with a reduced outer diameter, which is inserted into the first cylinder wall 6 of the first chamber part 3 (so that the chamber parts 3, 4 partially overlap each other). An outwardly directed, circumferential projection at the end of the plug-in section 15 engages in an inwardly directed circumferential groove of the first cylinder wall 6 and forms a positive-locking tongue-and-groove connection 16. This tongue-and-groove connection 16 allows the two chamber parts 3, 4 to rotate relative to each other about the axis of rotation R, but secures them against axial displacement relative to each other.

[0047] Adjacent to the second base side 12, the second chamber part 4 has a means 17 for attaching a storage container (not shown), wherein this means 17 is an internal thread in the illustrated embodiment.

[0048] The second chamber part 4 is arranged essentially next to the first chamber part 3 in the axial direction (i.e. in the direction of the axis of rotation R) and is mounted on the first chamber part 3 so as to be rotatable about the axis of rotation R (relative to the first chamber part 3).

[0049] A support element 18 is arranged on the first chamber part 3, wherein the support element 18 in the illustrated embodiment has the form of an obliquely cut cylinder.

[0050] The support element 18 is arranged on or connected to the first chamber part 3 in the region of the first base 5, i.e., on the closure plate 7, so that it projects axially into the chamber 2. In the illustrated embodiment, the support element 18 is connected to the closure plate 7 by a type of bayonet fitting; however, it can also be glued, screwed in, pressed in, or connected to the first chamber part 3 in another way (directly or indirectly).

[0051] The support element 18 is arranged decentrally in the chamber 2, i.e. a central longitudinal axis L of the cylindrical support element 18 and the axis of rotation R are not congruent, but parallel to each other and spaced apart from each other.

[0052] Four tongue-shaped components 19 are connected to the second chamber part 4. These components project into the chamber 2 along an inner side of the first cylinder wall 6, extending towards the first base 5. Each tongue-shaped component 19 has an inwardly facing support surface 21, with the support element 18 and the support surface(s) 21 overlapping in an axially extending comminution area Z.

[0053] In the comminution zone Z, both the support surfaces 21 and the support element 18 have comminution elements 22 in the form of plate-shaped projections. The comminution elements 22 of the support surfaces 21 point radially inwards (towards the axis of rotation R) and the comminution elements 22 of the support element 18 point radially outwards.

[0054] The comminution elements 22 are therefore arranged on the side of the support element 18 that is radially furthest from the axis of rotation R and faces continuously towards the cylinder walls 6, 11. A chamfered side 23 of the support element 18 (designed as a slant-cut cylinder) lies on its opposite side, facing the axis of rotation R.

[0055] The comminution elements 22 on the support surfaces 21 are short enough that they do not collide with the support element 18 when the chamber parts 3, 4 are rotated relative to each other, and the comminution elements 22 on the support element 18 are short enough that they do not collide with the support surface(s) 21 when the chamber parts 3, 4 are rotated relative to each other. At the same time, the comminution elements 22 are long enough to overlap each other (radially speaking) when the chamber parts 3, 4 are rotated relative to each other such that the comminution elements 22 of the support element 18 are moved past the comminution elements 22 of one of the support surfaces 21.

[0056] To prevent the comminution elements 22 from colliding with each other when the chamber parts 3, 4 are rotated, the comminution elements 22 of the support surfaces 21 are arranged axially offset from the comminution elements 22 of the support element 18. In the illustrated embodiment, the support element 18 has three comminution elements 22 and each of the support surfaces 21 has four comminution elements 22, with a comminution element 22 of the support surfaces 21 and a comminution element 22 of the support element always arranged alternately in the axial direction. When moving past or overlapping each other, the comminution elements 22 of the support element 18 engage with the comminution elements 22 of the moving support surface 21 and vice versa.

[0057] The comminution elements 22 each have a cutting edge 24 on a radially extending side. When the chamber parts 3, 4 are rotated in the respective direction of rotation intended for comminution, the comminution elements 24 and the carrier element 18 always meet first with their cutting edges 24, so that the material taken up between the carrier element 18 and the respective carrier surface 21 is comminuted as effectively as possible. In the Figs. 1 and 2 In the illustrated embodiment, for effective comminution, the first chamber part 3 with the support element 18 must be rotated counterclockwise and / or the second chamber part 4 with the support surfaces 21 must be rotated clockwise around the axis of rotation R.

[0058] A radial distance A formed between each support surface 21 and the support element 18 is changed (i.e., increased or decreased) by rotating the chamber parts 3, 4 relative to each other. The radial distance A is the shortest distance between the respective support surface 21 and the support element 18 viewed in a radial plane, i.e., in a plane orthogonal to the axis of rotation R.

[0059] The radial distance A between a support surface 21 and the support element 18 is always minimal when the comminution elements 22 of the respective support surface 21 move past the comminution elements 22 of the support element 18 (i.e., when they overlap or interlock). This is due, firstly, to the fact that the support element 18 is arranged decentrally in the chamber 2 (or on the first chamber part 3). Secondly, it is due to the fact that the support element 18 has the shape of a chamfered cylinder, so that over that axially extending section of the comminution area Z over which the chamfered side 23 extends (i.e., in the illustrated embodiment, over the entire comminution area), a greater change in the radial distance A occurs when the chamber parts 3, 4 are rotated.

[0060] The change in the radial distance A when rotating the chamber parts 3, 4 relative to each other is described in the Figs. 3 to 5illustrated, whereby the Figs. 3 to 5 In a highly simplified form, a further embodiment of the device 1 according to the invention is shown in a top view.

[0061] In this embodiment, only a single support surface 21 is arranged on (or formed directly on) the second chamber part 4. Furthermore, the cylindrical support element 18 does not have a chamfered side 23.

[0062] In the illustrated embodiments, the chamber parts 3, 4 are rotated relative to each other, whereby only the first chamber part 3 is rotated about the axis of rotation R and the second chamber part 4 remains stationary.

[0063] The support element 18 is arranged decentrally in the chamber 2, i.e., the longitudinal axis L of the support element 18 is offset from the axis of rotation R of the chamber 2. When the chamber parts 3, 4 are rotated relative to each other, the longitudinal axis L of the support element 18 moves – as schematically shown – on a circular path K around the axis of rotation R.

[0064] Fig. 3 Figure 1 shows the support element 18, arranged decentrally in chamber 2, in a position furthest from the support surface 21. Subsequently, the support element 18 is shown as in the Figs. 4 and 5As shown, the first chamber part 3 rotates counterclockwise around the axis of rotation R by twisting it around the axis of rotation R (or by twisting chamber parts 3 and 4 relative to each other). During this process, the radial distance A between the support surface 21 and the support element 18 decreases continuously until the comminution elements 22 of the support surface 21 and the support element 18 move past each other (or overlap each other) and the radial distance A is minimal. When the first chamber part 3 – as shown in the Figs. 3 to 5 If the figure is no longer shown - and is rotated further counterclockwise, the radial distance A between the support element 8 and the support surface 21 increases again up to a maximum radial distance A. Reference symbol list:

[0065] 1 Device 2 Cylindrical chamber 3 First chamber part 4 Second chamber part 5 First base 6 First cylinder wall 7 Closing plate 8 Holes 9 Circular projection 10--- 11 Second cylinder wall 12 Second base 13 Step 14 Wall section 15 Plug section 16 Tongue and groove connection 17 Fastening device 18 Support element 19 Tongue-shaped component 20---- 21 Support surface 22 Shredding element 23 Beveled side 24 Cutting edge R Rotation axis Chamber L Longitudinal axis Support element ZZ Reduction area A Radial distance K Circular path

Claims

1. Device (1) for comminuting herbs with a substantially cylindrical chamber (2) for receiving and comminuting herbs, the chamber (2) having a rotational axis (R) and being formed by at least a first chamber part (3) and a second chamber part (4) which are rotatable relative to one another about the rotational axis (R), wherein on one of the chamber parts (3, 4) a carrier element (18) extending substantially in axial direction into the chamber (2) is arranged, and on the other of the chamber parts (4, 3) at least one carrier surface (21) extending substantially in axial direction is arranged, the carrier element (18) and the carrier surface (21) overlapping one another in a comminuting region (Z) extending in axial direction, wherein in the comminuting region (Z) at least one radial outwardly extending comminuting element (22) is arranged on the carrier element (18) on one side and at least one radial inwardly extending comminuting element (22) is arranged on the carrier surface (21), and wherein the comminuting elements (22) are movable past one another by rotating the chamber parts (3, 4) so that they overlap radially, characterized in that the carrier element (18) is shaped and extends into the chamber (2) such that, by rotating the chamber parts (3, 4), a radial distance (A) formed between the carrier element (18) and the carrier surface (21) is variable at least over a section of the comminuting region (Z).

2. Device according to claim 1, characterized in that the substantially cylindrical chamber (2) is enclosed by the chamber parts (3, 4) in the circumferential direction and at least at a first base surface (5), wherein the chamber part (3, 4) enclosing the first base surface (5) has holes (8).

3. Device according to claim 2, characterized in that the first chamber part (3) encloses the substantially cylindrical chamber (2) in the circumferential direction and at the first base surface (5) or substantially only at the first base surface (5).

4. Device according to claim 3, characterized in that the second chamber part (4) encloses the substantially cylindrical chamber (2) in the circumferential direction and the second base surface (12), opposite the enclosed first base surface (5), is left open, wherein preferably the second chamber part (4) in a region adjacent to the second base surface (12) has means (17), for example a thread, for attaching a container, or that the second chamber part (4) encloses the chamber (2) in the circumferential direction as well as the second base surface (12), or that the second chamber part (4) substantially only encloses the second base surface (12).

5. Device according to any one of claims 1 to 4, characterized in that the chamber parts (3, 4) are arranged substantially side by side or one behind the other in the axial direction, wherein they preferably at least partially overlap.

6. Device according to any one of claims 2 to 5, characterized in that the carrier element (18) is arranged at the enclosed first base surface (5) and projects from there in the axial direction into the chamber (2).

7. Device according to any one of claims 1 to 6, characterized in that the carrier element (18) is arranged eccentrically in the chamber (2) or projects into the chamber.

8. Device according to any one of claims 1 to 7, characterized in that, on the other of the chamber parts (4, 3), a plurality of carrier surfaces (21) extending substantially in the axial direction are distributed around the circumference, each having at least one comminuting element (22) arranged thereon.

9. Device according to any one of claims 1 to 8, characterized in that the carrier element (18) and / or the carrier surface (21) or, if applicable, carrier surfaces (21) each have a plurality of axially spaced comminuting elements (22), and in that the comminuting elements (22) engage with one another when moved past each other.

10. Device according to any one of claims 1 to 9, characterized in that the carrier element (18) essentially has the shape of a cylinder.

11. Device according to claim 10, characterized in that the carrier element (18) is obliquely cut and has the shape of an obliquely cut cylinder, wherein an oblique surface (23) formed thereby is essentially on that side of the cylinder which is free of comminuting elements (22).

12. Device according to any one of claims 1 to 11, characterized in that the carrier surface (21) or, where applicable, the carrier surfaces (21) are formed on that chamber part (4, 3) on which they are arranged, or on a component (19) connected to said chamber part (4, 3).

13. Device according to any one of claims 1 to 12, characterized in that the comminuting elements (22) are in particular plate- or bar-shaped projections.

14. Device according to claim 13, characterized in that at least one of the comminuting elements (22), preferably some of the comminuting elements (22), in particular all of the comminuting elements (22), has / have a cutting edge (24) on a radially extending side.

15. Device according to any one of claims 1 to 14, characterized in that the chamber parts (3, 4) are rotatable relative to each other, either manually or electrically driven.