Patent Publication Number: US-2019167031-A1

Title: System for preparing a beverage

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/NL2017/050514 filed Aug. 3, 2017, which claims the benefit of and priority to Netherlands Patent Application No. NL 2017282 filed Aug. 3, 2016, the entire contents of each of which are hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     The invention generally relates to a system for preparing a beverage. The invention also relates to an apparatus and method for preparing a beverage. More specifically the invention relates to a system for preparing a beverage using a capsule. 
     In such systems, proper confinement of the capsules within the apparatus is important. One reason for this is that in certain apparatuses, hot water is led through the capsules, possibly under pressure. Not properly confined capsules may lead to malfunction of the system and potentially hazardous situations. 
     SUMMARY 
     One important condition for proper confinement is proper positioning of the capsule in the apparatus. It is preferred to provide the system with features for supporting proper positioning within the apparatus. In certain cases, centering of the capsule at a particular position for preparing the beverage may be advantageous for the process of preparing the beverage. 
     A first aspect provides a system for preparing a quantity of beverage suitable for consumption. The system comprises a first exchangeable capsule and a second exchangeable capsule, the second exchangeable capsule being larger than the first exchangeable capsule and an apparatus including a first brew chamber part and a second brew chamber part forming a brew chamber for selectively holding one of the first and second exchangeable capsules, and a fluid dispensing device for supplying an amount of fluid, such as water, under pressure to the first brew chamber part. The first brew chamber part includes a cavity for selectively receiving the first or second exchangeable capsule and the first brew chamber part and the second exchangeable capsule are adapted to each other such that an outer part of the second exchangeable capsule engages at least part of the inner circumferential wall of the first brew chamber part when loading the second exchangeable capsule into the first brew chamber part. 
     Optionally, the cavity of the first brew chamber part is arranged for receiving the first or second capsule. The cavity of the first brew chamber part can be a predetermined cavity arranged for holding the first or second capsule. The cavity can have an invariable shape for holding the first or second capsule. The first brew chamber part can be arranged for holding the first or second capsule without changing a configuration of the first brew chamber part. The first brew chamber part can be a monolithic part. 
     The cavity of the first brew chamber part provides guidance to the second exchangeable capsule, ensuring proper positioning before commencing the process of preparing the beverage. 
     In one embodiment, the outer part comprises a protrusion. An advantage of this embodiments is that the shape of the outer wall of the second capsule is not defined by the inner shape of the cavity. This provides freedom of design. 
     In another embodiment, the protrusion comprises at least two ribs extending from an outer circumferential wall, which ribs are annularly substantially equidistantly distributed over the circumferential wall and extending from a centre (center) axis of the second exchangeable capsule. 
     Providing ribs allows a simple mould to be used for manufacturing of the second capsule. Furthermore, the amount of material required for providing the ribs is relatively low. 
     In a further embodiment, the part of the inner circumferential wall of the cavity that the second exchangeable capsule is arranged to engage with is an outer edge of the inner circumferential wall of the cavity and the outer part of the second exchangeable capsule comprises a flange comprising a thickened part at the outer edge of the flange. 
     This embodiment allows proper positioning at the top of the capsule and at a position where both parts of the brew chamber meet. Hence, with this embodiment, proper alignment of the two brew chamber parts and the capsule, three components, may be further ensured. 
     In yet another embodiment, the first brew chamber part and the second capsule are adapted to each other such that the second capsule centres (centers) in the cavity by means of the outer part. 
     Positioning of the capsule within the cavity is important and within the definition of positioning, centering of the capsule is important. 
     In again a further embodiment, the first brew chamber part includes a centering module at the bottom of the cavity, wherein the first and second exchangeable capsules are arranged to cooperate with the centering module for centering the first and second capsules near the bottom of the cavity. 
     In certain embodiments of the system, the capsule may comprise means for positioning and centering in particular at the top of the capsule. In such embodiments, additional centering at the bottom of the second capsule may be required. This embodiment provides such additional centering at the bottom of the second capsule. 
     In again another embodiment, the first brew chamber part and the first exchangeable capsule are adapted to each other such that a flange like rim of the first exchangeable capsule engages at least part of an inner circumferential wall of the first brew chamber part when loading the first exchangeable capsule into the first brewing chamber part. 
     This embodiment provides additional centering at the point where the two parts of the brew chamber meet, as well as for the first capsule. This provides advantages of proper alignment as discussed above, not only for the second capsule, but also for the first capsule. This is an important advantage, as it allows for safe and reliable use of two types of capsules within one and the same apparatus. 
     According to an aspect is provided an apparatus of the system as described herein. 
     According to an aspect is provided a method for preparing a quantity of beverage suitable for consumption as described herein. 
     According to an aspect is provided a capsule, and a set of a first and second capsule as described herein. 
     It will be appreciated that any of the embodiments, aspects, features and options described in view of the system apply equally to the apparatus, capsules and method. It will also be clear that any one or more of the above embodiments, aspects, features and options can be combined. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will further be elucidated on the basis of exemplary embodiments which are represented in drawings. The exemplary embodiments are given by way of non-limitative illustration. It is noted that the figures are only schematic representations of embodiments of the invention that are given by way of non-limiting example. 
       In the drawings: 
         FIGS. 1A and 1B  show schematic representations of a system; 
         FIG. 2A  shows the schematic representations of the system in perspective view; 
         FIG. 2B  shows the schematic representation of the system from a side; 
         FIG. 3A, 3B, 4A, 4B, 5A, 5B, 5C, 6A, 6B, 7A, 7B, 8A , and  FIG. 8B  show the schematic representation of the system from a side in further detail; and 
         FIG. 9A, 9B, 9C, 9D , and  FIG. 9E  show various embodiments of a capsule. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       FIGS. 1A and 1B  show schematic cross sectional views of a system  1  for preparing a beverage. The system includes an apparatus  2  and an exchangeable capsule. Here the system  1  is arranged for cooperating with a first capsule  4 A and a second capsule  4 B. The apparatus  2  shown in  FIGS. 1A and 1B  is one and the same apparatus. The apparatus  2  is arranged for selectively cooperating with either the first capsule  4 A (see  FIG. 1A ) or the second capsule  4 B (see  FIG. 1B ). It will be appreciated that the system  1  can include the apparatus  2 , the first capsule  4 A and the second capsule  4 B. 
     The first and second capsules  4 A,  4 B are of a different type. In this example, the second capsule  4 B is larger than the first capsule  4 A. An axial length L B  of the second capsule  4 B is larger than an axial length L A  of the first capsule  4 A. A diameter D B  of the second capsule  4 B is a larger than a diameter D A  of the first capsule  4 A. Notwithstanding the differences, in this example the first and second capsules  4 A,  4 B are designed to make a similar visual impression. The first and second capsules  4 A,  4 B are designed to have a family look and feel. Here a ratio of the axial length and diameter L A /D A  of the first capsule  4 A is substantially the same as a ratio of the axial length and diameter L B /D B  of the second capsule  4 B. Preferably, the length to diameter ratio of the first and second capsules is identical within 20%, preferably within 10%, e.g. identical. 
     In view of the similarity, both capsules  4 A,  4 B will now be described simultaneously. In this example, the capsules  4 A,  4 B both include a cup-shaped body  6 A,  6 B. Here the cup-shaped body  6 A,  6 B includes a bottom  8 A  8 B and a circumferential wall  10 A,  10 B. The bottom  8 A,  8 B and the circumferential wall  10 A,  10 B can form a monolithic part. The capsules  4 A,  4 B both include a lid  12 A,  12 B. The lid  12 A,  12 B closes off an open end of the cup-shaped body  6 A,  6 B. The lid  12 A,  12 B includes an exit area  13 A,  13 B through which beverage can be drained from the capsule as explained below. In this example the lid  12 A,  12 B is connected to a flange-like rim  14 A,  14 B of the capsule  4 A,  4 B. Here the rim  14 A,  14 B is an outwardly extending rim. The bottom  8 A,  8 B, the circumferential wall  10 A,  10 B and the rim  14 A,  14 B can form a monolithic part. Here the exit area  13 A,  13 B defines the area of the lid  12 A,  12 B through which the beverage can potentially exit the capsule  4 A,  4 B. Hence, an area of the lid  12 A,  12 B sealed to the rim  14 A,  14 B does not constitute part of the exit area  13 A,  13 B. In this example, the capsules  4 A,  4 B are substantially rotation symmetric around an axis extending from the bottom  8 A,  8 B to the lid  12 A,  12 B. The cup-shaped body  6 A,  6 B and the lid  12 A,  12 B enclose an inner space  16 A,  16 B of the capsule. The inner space  16 A,  16 B includes a quantity of beverage ingredient, such as an extractable or soluble substance. The beverage ingredient can e.g. be roast and ground coffee, tea, or the like. The beverage ingredient can be powdered coffee. The beverage ingredient can be a liquid. In view of the difference in size of the capsules  4 A,  4 B it will be appreciated that the second capsule  4 B can include a larger quantity of beverage ingredient than the first capsule  4 A. In this example, the inner space  16 B of the second capsule  4 B is about twice the inner space  16 A of the first capsule  4 A. For example, the first capsule  4 A may include 4-8 grams, e.g. about 6 grams, of ground coffee. For example, the second capsule  4 B may include 8-16 grams, e.g. about 12 grams, of ground coffee. 
     The cup-shaped body  6 A,  6 B can be manufactured from a metal foil, such as aluminium foil, a plastics material, such as polypropylene or polyethylene, or a combination thereof. The cup-shaped body  6 A,  6 B can be manufactured by pressing, deep-drawing, vacuum forming, injection moulding or the like. The lid can be manufactured from a metal foil, such as aluminium foil, a plastics material, such as polypropylene or polyethylene, or a combination thereof. In the example the capsules  4 A,  4 B are so-called closed capsules. This indicates capsules that are hermetically closed prior to insertion into the apparatus. The closed capsules can be opened by the apparatus as described below. Alternatively, non-sealed or refillable capsules could also be used. 
     The apparatus includes a first brew chamber part  18  and a second brew chamber part  20 . The first and second brew chamber parts  18 ,  20  can be closed against each other to form a brew chamber  22 A,  22 B (not shown in  FIGS. 1A, 1B ). 
     The first brew chamber part  18  includes a cavity  24 . The cavity  24  is arranged for receiving the first or second capsule  4 A,  4 B. Here the cavity  24  of the first brew chamber part  18  is a predetermined cavity  24  arranged for holding the first or second capsule  4 A,  4 B. Here the cavity  24  has an invariable shape for holding the first or second capsule  4 A,  4 B. Here the first brew chamber part  18  is arranged for holding the first or second capsule  4 A,  4 B without changing a configuration of the first brew chamber part  18 . In this example the first brew chamber part  18  is a monolithic part. In this example the first brew chamber part  18  includes a first abutment surface  26 . The first abutment surface is positioned inside the cavity  24 . Here the first abutment surface  26  is a first generally annular abutment surface. The first generally annular abutment surface  26  can be continuously annular, or it may be interrupted annular, such as comprising a plurality of segments along an annulus. The first abutment surface  26  may for example take the shape of one or more, e.g. arched, ridges which protrude into cavity  22 . Here the first abutment surface  26  provides the cavity  22  with a stepped shape. In this example the first brew chamber part  18  includes a second abutment surface  28 . The second abutment surface is positioned near the open end of the cavity  24 . Here the second abutment surface  28  is a second generally annular abutment surface. The second generally annular abutment surface  28  can be continuously annular, or it may be interrupted annular, such as comprising a plurality of segments along an annulus. The second abutment surface  28  may for example take the shape of one or more, e.g. arched, ridges. It will be appreciated that the first abutment surface  26  and the second abutment surface  28  are spaced at a mutual distance in an axial direction of the first brew chamber part  18 . The first abutment surface  26  and the second abutment surface are positioned at a fixed spacing. The first abutment surface  26  and the second abutment surface are immobile relative to each other. Here, the first brew chamber part  18  includes an ejector  38 . In this example the ejector  38  includes a conical ring  40  and a resilient element  42 , here a helical spring. The first brew chamber part  18  includes piercing means  44  for piercing the bottom of the capsule. Here the piercing means includes a plurality of knives, such as three knives. 
     The second brew chamber part  20  includes an extraction plate  30 . In this example, the extraction plate  30  includes a central portion  32  and a peripheral portion  34 . The central portion  32  is movable relative to the peripheral portion  34 . Here the central portion  32  is movable in an axial direction of the second brew chamber part  20 . 
     The system  1  as describes thus far can be used for preparing a beverage as follows. Further features of the system  1  will be explained along the way. 
     In the example of  FIGS. 1A and 1B  the apparatus  2  is in a state ready for receiving a capsule. In  FIGS. 1A and 1B  the capsule  4 A,  4 B has just been inserted into the cavity of the first brew chamber part  18 . The first brew chamber part  18  is in an inclined position. The open end of the cavity  24  points upwards. 
     As shown in  FIG. 1A , the first capsule  4 A can fall into the cavity  24  under the influence of gravity. Herein the rim  14 A of the first capsule  4 A is guided by an inner surface  36  of the first brew chamber part  18 . The bottom  8 A of the first capsule  4 A lowers into the cavity  24  until it abuts against the ejector  38 . Here the bottom  8 A of the first capsule  4 A centres (centers) on the ejector  38 . It will be appreciated that the rim  14 A of the first capsule  4 A is positioned between the first abutment surface  26  and the second abutment surface  28 . The bottom  8 A of the first capsule  4 A is not yet pierced in this state. 
     As shown in  FIG. 1B , the second capsule  4 B can also fall into the cavity  24  under the influence of gravity. Herein the circumferential wall  10 B of the second capsule  4 B is guided by an inner surface  46  of the first brew chamber part  18 . Alternatively, other parts of the second capsule  4 B may be guided by the inner surface  46  of the first brew chamber part  18 . 
       FIG. 9A  shows another embodiment of the second capsule  4 B. In this embodiment, the second capsule  4 B comprises lateral ribs  19 B having substantially the same length. The lateral ribs  19 B are annularly substantially equidistantly distributed over the circumferential wall  10 B of the second capsule  4 B. The lateral ribs  19 B extend outward from the circumferential wall  10 B as extending from a centre (center) axis  25 B of the second capsule. 
     In this embodiment, the second capsule  4 B is guided by the inner surface  46  of the first brew chamber part  18  via the lateral ribs  19 B as outer part of the second capsule  4 B. Furthermore, the lateral ribs  19 B support centering of the second capsule  4 B in the second brew chamber part  18 . With the second capsule  4 B in the position as depicted by  FIG. 6B , the ends of the lateral ribs  19 B all touch the inner surface  46 . As the lateral ribs  19 B extend from the circumferential wall  10 B at substantially the same length, the second capsule  4 B is centred (centered) in the first brew chamber part  18  and the cavity  24  in particular. For proper centering, at least two lateral ribs  19 B are required and at least three lateral ribs  19 B are preferred. 
       FIG. 9B  shows a further embodiment of the second capsule  4 B. In this embodiment, the second capsule comprises an annular protrusion  20 B. The annular protrusion  20 B is in this embodiment provided as a continuous ring  20 B. The centre (center) of the ring  20 B coincides with the centre axis  25 B of the second capsule  4 B. The ring  20 B protrudes from the circumferential wall  10 B. 
     In this embodiment, the second capsule  4 B is guided by the inner surface  46  of the first brew chamber part  18  via the annular protrusion  20 B as outer part of the second capsule  4 B. Furthermore, the annular protrusion  20 B supports centering of the second capsule  4 B in the second brew chamber part  18 . With the second capsule  4 B in the position as depicted by  FIG. 6B , the ends of the annular protrusion  20 B touches the inner surface  46 . As the annular protrusion  20 B is provided concentrically with the second capsule  4 B, the second capsule  4 B is centred in the first brew chamber part  18  and the cavity  24  in particular. 
       FIG. 9C  shows yet another embodiment of the second capsule  4 B. In this embodiment, the second capsule comprises an annular protrusion parts  21 B, separated by protrusion gaps  22 B. The annular protrusion parts  21 B provide the same guiding and centering as with the annular protrusion  20 B as discussed above. 
       FIG. 9D  shows yet a further embodiment of the second capsule  4 B. In this embodiment, circumferential wall  10 B of the second capsule comprises a first circumferential wall part  10 B′ and a second circumferential wall part  10 B″. Both the first circumferential wall part  10 B′ and the second circumferential wall part  10 B″ are centered around the centre axis  25 B of the second capsule  4 B. Between the first circumferential wall part  10 B′ and the second circumferential wall part  10 B″, a step plateau  23 B is provided. The top of the second circumferential wall part  10 B″ has a larger diameter than the diameter bottom of the first circumferential wall part  10 B′. In another embodiment, the top of the second circumferential wall part  10 B″ has a smaller diameter than the diameter bottom of the first circumferential wall part  10 B′. 
     In this embodiment, the second capsule  4 B is guided by the inner surface  46  of the first brew chamber part  18  via the second circumferential wall part  10 B″ as outer part of the second capsule  4 B. Furthermore, the second circumferential wall part  10 B″ supports centering of the second capsule  4 B in the second brew chamber part  18  and the cavity  24  in particular. With the second capsule  4 B in the position as depicted by  FIG. 6B , the second circumferential wall part  10 B″ touches the inner surface  46 . 
     As the second circumferential wall part  10 B″ is provided concentrically with the second capsule  4 B, the second capsule  4 B is centred (centered) in the first brew chamber part  18  and the cavity  24  in particular. In case the top of the second circumferential wall part  10 B″ has a smaller diameter than the diameter bottom of the first circumferential wall part  10 B′, the guiding and centering is provided via the first circumferential part  10 B′. 
       FIG. 9E  shows yet a further embodiment of the second capsule  4 B. In this embodiment, circumferential wall  10 B and the flange-like rim  14 B in particular comprises a thickened outer ring  24 B. In the embodiment shown, the outer ring  24 B extends towards the bottom  8 B of the second capsule  4 B and the flange-like rim  14 B is flush with the top of the second capsule  4 B. In other embodiments, the outer ring  24 B extends beyond the top of the second capsule  4 B. 
     The outer ring  24 B is arranged to support centering of the second capsule  4 B in the cavity  24  of the second brew chamber part  18 . This support is provided by providing the outer ring  24 B to have an inner diameter that is slightly larger than the outer diameter of the second abutment surface  28  ( FIG. 4B ). This allows the outer ring  24 B to fit over the second abutment surface  28  at the end of the inner surface  46  of the cavity  24 . And if the outer ring  24 B is fit over the second abutment surface  28 , the second capsule is centred in the cavity  24 . 
     Whereas the embodiments shown by  FIG. 9A ,  FIG. 9B ,  FIG. 9C ,  FIG. 9D , and  FIG. 9E  are shown as distinct embodiments, the specific features may be combined for providing further embodiments, in any permutation possible. 
     The bottom  8 B of the second capsule  4 B lowers into the cavity  24  until it abuts against the ejector  38 . Here the bottom  8 B of the second capsule  4 B centres on the ejector  38 . As discussed, the ejector may comprises a conical ring  40  and a resilient element  42 . The resilient element  42  may be embodied as a helical spring  42  and in particular a helical spring having a circular cross-section. 
     With the helical spring  42  having a circular cross-section and protruding outward from the bottom of the bottom of the first brew chamber part  18 , in particular a distal end of the helical spring  42  protrudes from the bottom of the first brew chamber part  18 . As the helical spring  42  is open at the distal end, it may receive objects. In this embodiment, the distal end of the helical spring  42  is arranged for receiving the bottom  8 B of the second capsule  4 B. As the bottom  8 B of the second capsule  4 B has a conical shape, the second capsule  4 B automatically centres with the open distal end of the helical spring  42  and in that way, with the first brew chamber part  18  and the cavity  24  in particular. 
     As discussed above, the ejector  38  may include a conical ring  40 . The conical ring  40  is provided concentrically within the cavity  24  of the second brew chamber part  18 . Furthermore, the conical ring  40  preferably has at a distal side facing away from the bottom of the cavity a first diameter that is larger than a second diameter at a proximal end facing the bottom of the cavity  24 . 
     In particularly preferred embodiment, the conical ring  40  has an inner shape, within the conical ring  40 , that is substantially the same as the outer shape of the bottom  8 B of the second capsule  4 B. This allows the conical ring  40  to accommodate the bottom  8 B of the second capsule  4 B—or at least part thereof. This provides alternative or additional support at guiding and centering of the second capsule  4 B within the second brew chamber part  18  and the cavity  24  thereof in particular. 
     Embodiments of the second capsule  4 B that have no outer parts acting as particular guiding members near the bottom  8 B of the second capsule  4 B are with such embodiments as described directly above provided with improved centering within the cavity  24 . Also use of other embodiments of the second capsule  4 B and the first capsule  4 A may be improved by means of such centering module. 
     It will be appreciated that the rim  14 B of the second capsule  4 B is positioned beyond the second abutment surface  28  when seen from the piercing means  44 . The bottom  8 B of the second capsule  4 B is not yet pierced in this state. 
     Once the capsule  4 A,  4 B is inserted into the cavity  24  as shown in  FIGS. 1A and 1B , the first brew chamber part  18  can be moved towards the second brew chamber part  20  for closing the brew chamber around the capsule  4 A,  4 B. The first brew chamber part  18  is guided in a frame  48  of the apparatus. 
     In this example the first brew chamber part  18  includes first bosses  50  and second bosses  52  as shown in  FIGS. 2A and 2B . The first bosses  50  are guided in a first groove  54  of the frame  48 . The second bosses  52  are guided in a second groove  56  of the frame  48 . It will be appreciated that the bosses  50 ,  52  and grooves  54 ,  56  determine the path that will be followed by the first brew chamber part  18 . Here the first groove  54  and the second groove  56  are provided in a side wall  57  of the frame  48 . The first groove  54  extends into the side wall  57  to a first depth. The second groove  56  extends into the side wall to a second depth. The second depth is larger than the first depth. The first boss  50  has a larger diameter than the second boss  52 . The first groove  54  has a larger width than the second groove  56 . The width of the first groove  54  corresponds to the diameter of the first boss  50 . The width of the second groove  56  corresponds to the width of the second boss  52 . It will be appreciated that the first groove  54  extends along a different trajectory than the second groove  56 . The different widths and depths of the grooves allow the first and second bosses  50 ,  52  to follow different trajectories. This construction allows a very compact construction for guiding the first and second bosses  50 ,  52 . 
     The apparatus  2  includes a lever  58 . The lever can be actuated manually by a user. The lever is pivotally connected to the frame  48  around a lever axis  60 . The first brew chamber part  18  is connected to the frame  48  via a knee joint  62 . The knee joint  62  includes a push rod  64  and a crank  66 . The push rod  64  is pivotally connected to the crank  66  at a knee axis  68 . The crank  66  is pivotally connected to the frame  48  at a crank axis  70 . The lever  58  is connected to the knee joint  62  for actuating the first brew chamber part  18  in motion. Here the lever  58  is connected to the knee joint  62  through a lever link  74 . The lever link  74  is pivotally connected to the lever  58  at a lever link axis  76 . The lever link  74  is pivotally connected to the push rod  74  at a knee link axis  78 . 
     An arresting ring  80  is arranged surrounding the first brew chamber part  18 . The arresting ring  80  is axially movable relative to the first brew chamber part  18 . Here, the arresting ring  80  is guided by an external surface of the first brew chamber part  18 . The arresting ring is connected to the first brew chamber part via one or more resilient elements  82 , here helical springs. The push rod is pivotally connected to the arresting ring  80  at a push rod axis  72 . Hence, here the knee joint  62  is indirectly connected to the first brew chamber part  18 , viz. via the arresting ring  80  and one or more resilient elements  82 . The function of the arresting ring will be set out below. 
     When the lever  58  is moved in a downward direction the knee joint  62  will push the first brew chamber part  18  towards the second brew chamber part  20 . Simultaneously, due to the shape of the first and second grooves  54 ,  56 , the first brew chamber part  18  will be rotated from the upwards inclined orientation into a an aligned orientation in which an axial direction of the first brew chamber part  18  is aligned with an axial direction of the second brew chamber part  20 . 
     As mentioned above, the apparatus  2  is arranged for selectively cooperating with either the first capsule  4 A or the second capsule  4 B. Here, the system  1  is arranged for automatically adjusting the brew chamber depending on whether the first or the second capsule has been inserted. This provides the advantage that no user input is required for selecting proper handling of the first or second capsule. Hence, the risk of errors is greatly reduced. 
     As mentioned, the second brew chamber part  20  includes an extraction plate  30  with a central portion  32  and a peripheral portion  34 . Here the central portion  32  is movable in an axial direction of the second brew chamber part  20 . The central portion  32  in this example includes a shaft  32 ′ axially slidably movable with respect to the frame  48 . The central portion  32  is connected to the frame  48  via a resilient member  84 , here a helical spring. The resilient member  84  biases the central portion into a ready position in  FIGS. 1A and 1B . The ready position is an extended position in this example. The central portion  32  can be positioned in a first brewing position for cooperating with the first capsule  4 A. The central portion can be positioned in a second brewing position for cooperating with the second capsule  4 B. In this example, the system  1  includes a locking mechanism  86  arranged for locking the central portion  32  in or near the first brewing position when the cavity  24  holds the first capsule  4 A. 
     The locking mechanism  86  includes a locker  88 . Here the locker  88  is designed as a pivotable finger, pivotable around a pivoting axis  90 . The locker  88  is biased into a position pivoted away from the shaft  32 ′. The locker could also be biased into any other suitable position. The locking mechanism  86  further includes a pusher  92 . The pusher is slidably guided in a body  94  of the second brew part  20 . The pusher  92  is connected to the body  94  via a resilient member  96 , here a helical spring. The resilient member  96  biases the pusher in an extended position. The first brew chamber part  18  includes an actuator  98 . Here the actuator is formed by a frontal surface of the first brew chamber part  18 . 
       FIGS. 3A and 3B  show functioning of the locking mechanism  86  when the cavity  24  holds the first capsule  4 A. In this example, an outermost part of the first capsule  4 A, here formed by the lid  12 A, exit area  13 A and/or rim  14 A, is positioned rearwardly, i.e. more towards the piercing means  44 , relative to the actuator  98 . As a result, when advancing the first capsule  4 A towards the second brew chamber part  20 , the actuator  98  will touch the pusher  92  before the outermost part of the first capsule  4 A will touch the central portion  32 . The pusher is pushed against the biasing force of the resilient member  96 . A lip  100  of the pusher  92  will slide along a sloping surface  102  of the locker  88 , causing the locker  88  to pivot towards the shaft  32 ′. As a result, a thumb  104  of the locker  88  is placed in a path of movement of part  106  of the central portion  32  (see  FIG. 3B ). When the first capsule  4 A is advanced further towards the second brew chamber part  20  the first capsule  4 A will abut against the central portion  32 . This can cause the central portion to be pushed against the biasing force of the resilient member  84 . The pivoted locker  88  prevents travel of the central portion beyond a position where the part  106  abuts against the thumb  104 . This is herein defined as the first brewing position. Hence, the first capsule  4 A is arranged for moving the central portion  32  from the ready position to the first brewing position. The first capsule  4 A is held between the first and second brew chamber parts  18 ,  20  while brewing, wherein the central portion  32  is in the first brewing position. 
       FIGS. 4A and 4B  show functioning of the locking mechanism  86  when the cavity  24  holds the second capsule  4 B. In this example, an outermost part of the second capsule  4 B, here formed by the lid  12 B, exit area  13 B and/or rim  14 B, is positioned forwardly, i.e. more towards the second brew chamber part  20 , relative to the actuator  98 . As a result, when advancing the second capsule  4 B towards the second brew chamber part  20 , the outermost part of the second capsule  4 B will abut against the central portion  32  before the actuator  98  will touch the pusher  92 . The central portion  32  is pushed against the biasing force of the resilient member  84  while the locker  88  is still pivoted away from the shaft  32 ′. As a result, the part  106  passed underneath the thumb  104 . Only after the part  106  has passed the thumb  104  the pusher is pushed against the biasing force of the resilient member  96  by the actuator  98 . The lip  100  of the pusher  92  will still slide along the sloping surface  102  of the locker  88 , causing the locker  88  to pivot towards the shaft  32 ′. However, the part  106  has already passed the thumb  104  at that moment. In this example, the second capsule  4 B pushes the central portion  32  in abutment with the body  94 . This is herein defined as the second brewing position. Hence, the second capsule  4 B is arranged for moving the central portion  32  from the ready position to the second brewing position. The second capsule  4 B is held between the first and second brew chamber parts  18 ,  20  while brewing, wherein the central portion  32  is in the second brewing position. 
     Thus, the locking mechanism  86  is arranged for locking the central portion  32  in the first extraction position when the cavity  24  holds the first capsule  4 A. It is noted that the locking may be single-sided, viz. the locking mechanism may prevent the central portion  32  from being moved beyond the first extraction position when the cavity  24  holds the first capsule  4 A. However movement of the central portion  32  from the first extraction position to the ready position may be not prevented. The locking unit  86  is arranged for selectively preventing the central portion  32  being locked in or near the first brewing position when the second capsule  4 B is included in the brew chamber. The locking unit  86  is arranged for selectively allowing the central portion  32  being moved into the second brewing position when the second capsule is included in the brew chamber. 
     When comparing  FIGS. 3A and 4A  it will be appreciated that while advancing the first brew chamber part  18  towards the second brew chamber part  20  the first capsule  4 A is recessed further into the first brew chamber part than the second capsule  4 B. Then the first lid  12 A, exit area  13 A and/or rim  14 B is recessed further into the first brew chamber part  18  than the second lid  12 B, exit area  13 B and/or rim  14 B. 
     When comparing  FIGS. 3B and 4B  it will be appreciated that when the brew chamber holds the first capsule  4 A, the central portion  32  extends into the cavity  24 . The central portion  32  extends into the first brew chamber part  18  beyond a position where the lid  12 B, exit area  13 B and/or rim  14 B of the second capsule  4 B would have been, had the second capsule been included in the first brew chamber part  18 . 
     As mentioned above, the knee joint  62  is indirectly connected to the first brew chamber part  18 , viz. via the arresting ring  80  and one or more resilient elements  82 .  FIGS. 5A-5C  demonstrate functioning of the arresting ring  80 . 
     In  FIG. 5A  the first capsule  4 A abuts against the central portion  32  with the central portion in the first brewing position. The arresting ring  80  is still in the rearward position. It will be appreciated that the lever  58  will not yet have reached its end position. The first brew chamber part  18  includes a protrusion  108 . Here the protrusion  108  is a substantially annular protrusion. The protrusion  108  extends outwardly. Here the protrusion  108  forms an outermost edge of the first brew chamber part  18 . The second brew chamber part  20  includes a retainer  110 . Here the retainer  110  is designed as a circumferential ring of retainer lips. The retainer  110  is pivotally connected to the body  94 . Here the retainer  110  is resiliently pivotally connected to the body  94 . The retainer  110  includes a tooth  112 . The tooth here has a first inclined surface  114  and a second inclined surface  116 . 
     When lowering the lever  58 , the arresting ring  80  will be advanced towards the second brew chamber part  20 . The one or more resilient elements  82  will push the first brew chamber part  18  ahead of the arresting ring  80  until the first brew chamber part abuts against the second brew chamber  20  part, e.g. with the capsule  4 A,  4 B clamped in between. During this movement, the protrusion  108  will advance against the first inclined surface  114 . This causes the retainer  110  to be pivoted outwardly (see  FIG. 5A ). Further advancing causes the protrusion  108  to pass beyond the second inclined surface  116 , causing the retainer  110  to pivot inwardly (see  FIG. 5B ). Further lowering of the lever  58  first brew chamber part abuts against the second brew chamber  20  part will cause the one or more resilient elements  82  to be compressed. As a result, the arresting ring  80  will advance towards the second brew chamber part  20 . Fully lowering the lever  58  will cause the arresting ring  80  to be interposed between the retainer  110  and a locking ring  118  (see  FIG. 5C ). The arresting ring  80  surrounding the retainer  110  prevents the retainer  110  from pivoting outwardly. Hence, the first brew chamber part is locked with respect to the second brew chamber part  20 . The first brew chamber part is locked onto the second brew chamber part  20 . 
     The apparatus can include a fluid supply system for supplying a fluid, e.g. a liquid, such as hot water under pressure, to the first brew chamber part  18 . When the brew chamber is pressurized with the fluid for brewing a beverage, the first and second brew chamber parts  18 ,  20  will be pushed away from each other by the fluid pressure. The retainer  110  and arresting ring  80 , and optionally the locking ring  118 , will bear all, or part of, the force exerted by the fluid pressure. The arresting ring  80  interposed between the retainer  110  and the locking ring  118  increases mechanical stability. The arresting ring  80  does not have to bear all forces exerted onto it by the retainer  110 , since it can abut against the locking ring  118  and transmit at least part of the forces to the locking ring  118 . The locking ring  118  can be immobile, and hence can easily be reinforced. Since the first brew chamber part is locked onto the second brew chamber part  20  the frame  48  and the actuation mechanism, e.g. the knee joint, do not have to bear this force, or at least a smaller part thereof. Hence the frame and/or the actuation mechanism can be designed weaker and/or cheaper. 
     Although the functioning of the arresting ring  80  has been shown in  FIGS. 5A-5C  with respect to the first capsule  4 A, it will be appreciated that the arresting ring  80  can function identically with respect to the second capsule  4 B.  FIG. 6A  shows the first capsule  4 A in the brew chamber during extraction.  FIG. 6B  shows the second capsule  4 B in the brew chamber during extraction. 
     The piercing member  44  is arranged for piercing the bottom  8 A,  8 B of the capsule  4 A,  4 B. As can also be seen in  FIGS. 5A-5C , in this example the piercing member  44  does not pierce the bottom  8 A,  8 B until the lid  12 A,  12 B of the capsule  4 A,  4 B abuts against the central portion  32  in the first or second brewing position. Thereto, stiffnesses of the resilient element  42  and the resilient member  84  can be chosen. In this example, the stiffness of the resilient element  42  is chosen to be larger than the stiffness of the resilient member  84 . However, it will be appreciated that it is also possible that the stiffness of the resilient element  42  is equal to the stiffness of the resilient member  84  or that the stiffness of the resilient element  42  is smaller than the stiffness of the resilient member  84 . 
     Once the capsule  4 A,  4 B is included in the brew chamber, and the bottom  8 A,  8 B has been pierced, a fluid, in this example hot water under pressure, can be supplied to the brew chamber. Therefore it is desired that the brew chamber is leak tight. Thereto the central portion  32  is provided with a first sealing member  120 . The peripheral portion  34  is provided with a second sealing member  122 . The beverage preparation apparatus  2  is arranged for preparing a quantity of a beverage, suitable for consumption, using either a first capsule  4 A or a second capsule  4 B. The quantity can be a predetermined quantity. The quantity can also be a user selectable, user settable, or user programmable quantity. 
     Referring to  FIG. 3B  sealing in view of the first capsule  4 A is described. The first sealing member  120  is arranged for providing a fluid sealing engagement between the central portion  32  and the first brew chamber  18  part when forming the brew chamber for holding the first capsule  4 A. In this example, the first sealing member  120  abuts against the first brew chamber part  18  when the first capsule  4 A is included in the brew chamber. This provides a seal for water being present in the cavity  24  outside the capsule  4 A. This way, brewing fluid injected into the brew chamber  22 A is prevented from bypassing around the outside of the capsule  4 A. In the example of  FIG. 3B  the first sealing member  120  includes a resilient lip  121 . The resilient lip  121  is arranged to provide a self-reinforcing sealing engagement between the central portion  32  and the first brew chamber part  18  under the effect of fluid pressure in the brew chamber. In this example the first sealing member  120  abuts against the rim  14 A of the first capsule  4 A. The rim  14 A is pressed against the first sealing member  120  by the first abutment surface  26 . This provides a sealing engagement between the central portion  32  and the capsule  4 A against beverage exiting the capsule  4 A via the exit area  13 A. It will be appreciated that here the side of the rim  14 A facing away from the cup-shaped body  6 A is sealed against the second brew chamber part  20 . Alternatively, or additionally, the side of the rim  14 A facing towards the cup-shaped body  6 A can be sealed against the first brew chamber part  18 . Thereto an additional seal can be provided on the first brew chamber part  18 , e.g. on the first abutment surface  26 , and/or on the capsule  4 A, e.g. on the rim  14 A. It will be clear that a seal on the capsule may be additional to the seal between the first brew chamber part  18  and the second brew chamber part  20 . This may reduce the sealing effort by the first sealing member  120 . 
     Referring to  FIG. 4B  sealing in view of the second capsule  4 B is described. The second sealing member  122  is arranged for providing a fluid sealing engagement between the peripheral portion  34  and the first brew chamber  18  part when forming the brew chamber for holding the second capsule  4 B. In this example, the second sealing member  122  abuts against the first brew chamber part  18  when the second capsule  4 B is included in the brew chamber. This provides a seal for water being present in the cavity  24  outside the capsule  4 B. In the example of  FIG. 4B  the second sealing member  122  includes a resilient lip  123 . The resilient lip  123  is arranged to provide a self-reinforcing sealing engagement between the peripheral portion  34  and the first brew chamber part  18  under the effect of fluid pressure in the brew chamber. In this example the second sealing member  122  abuts against the rim  14 B of the second capsule  4 B. The rim  14 B is pressed against the second sealing member  122  by the second abutment surface  28 . This may provide a sealing engagement between the peripheral portion  34  and the capsule  4 B against beverage exiting the capsule  4 B via the exit area  13 B. In  FIG. 4B  the first sealing member  120  provides a sealing engagement between the central portion  32  and the peripheral portion  34  when forming the brew chamber for holding the second capsule  4 B. This sealing engagement between the central portion  32  and the peripheral portion  34  can be self-reinforcing. Thereto the engagement between peripheral portion  34  and the second capsule  4 B may allow brewing fluid to pass to the first sealing member  120 . Hence, the first sealing member  120  provides a sealing engagement between the central portion  32  and the capsule  4 B against beverage exiting the capsule  4 B via the exit area  13 B. It will be appreciated that here the side of the rim  14 B facing away from the cup-shaped body  6 B, which rim may or may not be covered by a lid, for example by a foil, is sealed against the second brew chamber part  20 . Alternatively, or additionally, the side of the rim  14 B facing towards the cup-shaped body  6 B can be sealed against the first brew chamber part  18 . Thereto an additional seal can be provided on the first brew chamber part  18 , e.g. on the second abutment surface  28 , and/or on the capsule  4 B, e.g. on the rim  14 B. It will be clear that a seal on the capsule may be additional to the seal between the first brew chamber part  18  and the second brew chamber part  20 . This may reduce the sealing effort by the second sealing member  122 . 
     When the fluid under pressure is supplied to the capsule  4 A,  4 B in the brew chamber, the exit area  13 A,  13 B may open against the extraction plate  30 . The extraction plate  30  in this example includes a plurality of relief elements  124 . Here the relief elements  124  are truncated pyramids. A rise in pressure inside the capsule  4 A,  4 B can cause the exit area  13 A,  13 B to tear against the relief elements allowing beverage to exit the capsule  4 A,  4 B. 
     The beverage can pass through the extraction plate  30  via apertures in the extraction plate. Next the beverage can flow to an outlet  126 . From the outlet  126  the beverage can flow into a receptacle, such as a cup. 
     Once the beverage has been brewed, the lever  58  can be moved upwardly. This causes the arresting ring  80  to be moved away from the retainer  110 . Next, the first brew chamber part  18  will be moved rearwardly. The second inclined surface  116  of the retainer  110  can allow the retainer to pass the projection  108 . The first brew chamber  18  part will move away from the second brew chamber part  20 . The central portion  32  will return to the ready position. The bosses  50 ,  52  and grooves  54 ,  56  determine the path that will be followed by the first brew chamber part  18 . As shown in  FIGS. 7A and 7B  the first brew chamber part will swivel downwardly. This promotes ejection of the used capsule  4 A,  4 B from the cavity  24  under the effect of gravity. The ejector  38  can assist in pushing the capsule  4 A,  4 B off the piercing member  44  and out of the cavity  24 . The used capsule  4 A,  4 B can fall into a waste basket of the apparatus  2 . 
     In this example the first and second capsules  4 A,  4 B are designed to make a similar visual impression.  FIG. 8A  shows an example of a first capsule  4 A inserted in the brew chamber  22 A formed by the first brew chamber part  18  and the second brew chamber part  20 . It will be appreciated that the circumferential wall  10 A is narrower than the cavity  24  at that location. As a result there is a first volume  126  surrounding the first capsule  4 A inside the cavity  24 .  FIG. 8B  shows an example of a second capsule  4 B inserted in the brew chamber  22 B formed by the first brew chamber part  18  and the second brew chamber part  20 . It will be appreciated that a part  128  of the circumferential wall  10 B is narrower than the cavity  24  at that location. This part  128  is formed by the part of the circumferential wall  10 B extending beyond the first abutment surface  26 . As a result there is a second volume  130  surrounding the second capsule  4 B inside the cavity  24 . 
     It is noted that the first volume  126  is not occupied by the first capsule  4 A when the brew chamber holds the first capsule  4 A. However, this first volume  126  is occupied by part of the second capsule  4 B when the brew chamber holds the second capsule  4 B. The second volume  130  is not occupied by the second capsule  4 B when the brew chamber holds the second capsule  4 B. This second volume  130  receiving the central portion  32  of the extraction plate  30  when the brew chamber holds the first capsule  4 A. 
     When brewing a beverage using the first capsule  4 A, the first volume  126  will fill with fluid, such as water, which fluid is not used for brewing the beverage. This fluid can be drained to the waste basket after brewing. When brewing a beverage using the second capsule  4 B, the second volume  130  will fill with fluid, such as water, which fluid is not used for brewing the beverage. This fluid can be drained to a container, e.g. the waste basket, after brewing. In this example the first volume  126  is substantially equal to the second volume  130 . Hence, the volume of fluid directed to the waste basket is substantially equal when brewing a beverage using a first capsule  4 A and when brewing a beverage using a second capsule  4 B. 
     Herein, the invention is described with reference to specific examples of embodiments of the invention. It will, however, be evident that various modifications and changes may be made therein, without departing from the essence of the invention. For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments, however, alternative embodiments having combinations of all or some of the features described in these separate embodiments are also envisaged. 
     In the examples, the central portion of the extraction plate includes a plurality of relief elements. The peripheral portion includes no relief elements. However, it will be appreciated that the peripheral portion may also include relief elements. The extraction plate and the second exit area can be adapted to each other such that a flow resistance of the second exit area when opened is less than a flow resistance of the first exit area when opened. The extraction plate and the second exit area may be adapted to each other such that the second exit area tears on the extraction plate over a larger surface area than the first exit area. The extraction plate and the second exit area may be adapted to each other such that the second exit area tears on the extraction plate on more locations than the first exit area. Outer relief elements may be designed for tearing both the first and second exit area wherein the second exit area tears on the outer relief elements over a larger surface area than the first exit area. The extraction plate can include relief elements of a first type and at least one relief element of a second type, wherein the relief elements of the first type are arranged within an area corresponding to the first exit area, and the at least one relief element of the second type being arranged within an area corresponding to the second exit area and outside the area corresponding to the first exit area. The relief element of the second type may have a sharper edge than the relief elements of the first type. The second exit area may include a weakened zone. The weakened zone may be located in a peripheral area of the second exit area. 
     In the examples, the first and second capsules have substantially the same shape. It is also possible to provide a third capsule having a different shape. The third capsule can e.g. be shaped to substantially fill the brew chamber when the central portion is in the first extraction position. It is also possible to provide a fourth capsule having a different shape. The fourth capsule can e.g. be shaped to substantially fill the brew chamber when the central portion is in the second extraction position. 
     In the examples, the first capsule has an outwardly extending flange-like rim. It will be appreciated that it is possible that the first capsule does not include an outwardly extending rim. In the examples, the second capsule has an outwardly extending flange-like rim. It will be appreciated that it is possible that the second capsule does not include an outwardly extending rim. 
     In the examples, the capsule body and lid are made of aluminium foil, preferable polymer coated aluminium foil to allow easy welding of the lid to the body. It will be appreciated that the capsule body and/or lid can be made of a wide variety of materials considered suitable by the skilled person and capable of being processed into a sheet, film or foil using techniques conventionally known in the art such as extrusion, co-extrusion, injection molding, blow molding, vacuum forming etc. Suitable materials for the capsule body and/or lid include, without being limited thereto, plastic materials, in particular thermoplastic materials, for example a polyolefin polymer, for example polyethylene or polypropylene, PVC, polyesters for example polyethylene terephthalate (PET); metal foils such as aluminum, stainless steel, metal alloys etc.; or sheets of a woven or a non-woven or otherwise processed fibrous material, like paper, polyester, etc.; or combinations thereof, e.g. multilayers. The material for the capsule can be a biodegradable polymer or another biodegradable material. The skilled person will be capable of selecting the appropriate material taking into account the envisaged use with food material and any other relevant circumstances during use of the capsule. The thickness of the sheet or foil may be chosen such that a form stable capsule is provided. The thickness of the sheet or foil may vary with the nature of the material. 
     In the examples, the capsules are closed capsules. It is also possible to provide the system with an open capsule. The open capsule is open prior to insertion into the apparatus. The open capsule can be pre-perforated. The open capsule can be packaged in a hermetically sealed package which has to be removed before inserting the open capsule in the apparatus. In the examples, the capsules are pierced by the piercing means. It is also possible to provide the system with a capsule that is not pierced by the piercing means. Such capsule can e.g. include an entrance filter. In the examples, the capsules open against the extraction plate. It is also possible to provide the system with a capsule that does not open against the extraction plate. Such capsule can e.g. include an exit filter. 
     In the examples, the capsules themselves do not include a sealing member. It will be appreciated that it is possible to provide the capsule with a sealing member, e.g. a resilient sealing member. The sealing member can e.g. be placed on the rim, e.g. on the side facing towards the cup-shaped body or on the side facing away from the cup-shaped body. Alternatively, or additionally, a sealing member can be provided on the circumferential wall and/or on the bottom. 
     In the examples the arresting ring and retainer extend along substantially the entire perimeter of the first and second brew chamber parts. This provides particular good locking of the two brew chamber parts onto each other. However, it will be appreciated that it is also possible that the arresting ring and retainer include arresting means and retaining means at one or more discrete positions along the perimeter, e.g. at two, three, four, six or eight positions. 
     It will be appreciated that it is also possible to provide a first apparatus arranged for brewing a beverage using a first capsule, but incapable of brewing a beverage using a second capsule. Such first apparatus can be included in a system with the apparatus as described in relation to the figures and a first capsule and optionally a second capsule. 
     It will be appreciated that it is also possible to provide a second apparatus arranged for brewing a beverage using a second capsule, but incapable of brewing a beverage using a first capsule. Such second apparatus can be included in a system with the apparatus as described in relation to the figures and a second capsule and optionally a first capsule. 
     However, other modifications, variations, and alternatives are also possible. The specifications, drawings and examples are, accordingly, to be regarded in an illustrative sense rather than in a restrictive sense. 
     For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments, however, it will be appreciated that the scope of the invention may include embodiments having combinations of all or some of the features described. 
     In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word ‘comprising’ does not exclude the presence of other features or steps than those listed in a claim. Furthermore, the words ‘a’ and ‘an’ shall not be construed as limited to ‘only one’, but instead are used to mean ‘at least one’, and do not exclude a plurality. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to an advantage.