Abstract:
A beverage preparation device is disclosed which comprises an insert that is inserted into a receptacle and can be interlocked with the receptacle. The beverage preparation device comprises a receptacle ( 1 ), a receptacle holder ( 2 ), and an insert, e.g. a lid ( 3 ) or a holding element. The receptacle holder ( 2 ) has at least one element ( 24 ) which protrudes from the receptacle ( 1 ) and on which at least one engaging structure ( 26 ) is provided that cooperates with a second engaging structure ( 34 ) on the insert ( 3 ) in such a way that the insert is releasably interlocked with the receptacle ( 1 ). Preferably, the two engaging structures represent a bayonet joint.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to a beverage maker comprising an upwardly open receptacle which is held in a receptacle holder, and an insert, for example a lid or an annular retaining element. Beverage makers of this type are used in particular for preparing coffee or tea or for frothing milk. 
       PRIOR ART 
       [0002]    Plunger-filter coffee makers, which are frequently also referred to as “French Press” coffee makers, have long been known from the prior art. Said beverage makers normally comprise an upwardly open, cylindrical glass receptacle in which a filter plunger is arranged in a vertically displaceable manner. The filter plunger comprises a plunger rod, to the lower end of which a plunger filter with a fine wire or plastics mesh is fitted. The plunger rod is guided through a cover which upwardly covers the receptacle. 
         [0003]    In order to prepare, for example, tea or coffee, tea leaves or ground coffee beans are placed into the glass receptacle and hot water is poured thereon. The mixture is left to stand for a few minutes. The filter plunger is subsequently inserted into the glass receptacle and pressed down. In the process, the plunger filter separates the coffee which is ready for drinking from the spent coffee powder. In order to pour the coffee, a beak-like spout is normally formed on the upper rim of the glass receptacle. 
         [0004]    In order to ensure protection from spray, the lid, generally having a circumferential skirt, which is perforated in the region of the spout, is pushed loosely into the upper end of the glass receptacle. Since the glass receptacle can have considerable production tolerances, the outside diameter of said skirt is generally a little smaller than the inside diameter of the upper opening of the receptacle, and the connection between the receptacle and lid is therefore normally completely loose. The loose connection of the glass receptacle to the lid gives rise to the risk that the lid may slip as the plunger filter is being pressed down and the beverage may spray out of the glass receptacle. Furthermore, because the lid rests loosely on the glass receptacle, upon incorrect handling or if the beverage maker tips over, hot liquid may escape from the beverage maker, thus causing ready-made coffee to be spilt and the user may be scalded. 
       SUMMARY OF THE INVENTION 
       [0005]    It is therefore an object of the present invention to specify a beverage maker in which an insert, for example a lid having a drawn-down skirt, is prevented from slipping in the receptacle in order therefore to increase the protection against scalding. To achieve this object, a beverage maker is proposed, as specified in claim  1 . Advantageous embodiments of the invention are specified in the dependent claims. 
         [0006]    The present invention therefore provides a beverage maker with the following features:
       an upwardly open receptacle made of a heat-resistant material, in particular glass, with a receptacle bottom, a circumferential side wall and an upper opening;   a receptacle holder which at least partially embraces the side wall of the receptacle; and   an insert which is inserted into the upper opening in the receptacle and projects into said receptacle, for example by means of a skirt-like region.       
 
         [0010]    The receptacle holder comprises at least one element which protrudes upward over the receptacle and comprises a first engagement structure, for example a groove or a first threaded section. At least one second engagement structure in the form of, for example, a lug or a second threaded section is formed on the insert, said engagement structure interacting with the first engagement structure on the receptacle holder in such a manner that the insert can be locked releasably in relation to the receptacle holder by means of a rotational movement. In the case of a groove and a lug, said groove and lug may also be interchanged with regard to the insert and receptacle holder. 
         [0011]    A configuration of this type permits any insert, for example a lid or a retaining ring for a filter, to be fastened lockably to the receptacle without there being the risk, if the beverage maker tips over, that the insert will become detached and, as a result, hot drink will be spilt or the user will be scalded. 
         [0012]    The engagement structures preferably form a bayonet joint, i.e. the engagement structures are designed in such a manner that the insert can first of all be pushed into the receptacle vertically from above and can then be rotated essentially about a vertical axis, i.e. in a horizontal direction, through a predefined, limited angular range in relation to the receptacle. Upon this movement, the engagement structures enter into engagement with each other. In a predetermined end position, the engagement structures mutually form a stop which prevents further rotation beyond the end position. 
         [0013]    In particular, the beverage maker may be a “French-Press” beverage maker. The receptacle then has a cylindrical basic shape, in which case said receptacle may optionally expand upward a little in an upper rim region. The receptacle is preferably composed of glass and can be of single-walled or double-walled configuration. A vertically displaceable filter plunger is arranged in the receptacle and has a plunger rod, to the upper end of which an actuating element, for example in the form of a gripping knob, is fitted, and to the lower end of which a sieve-like plunger filter is fitted, the plunger filter being suitable to permit the passage of liquid and at the same time to retain solids. The plunger rod passes through the insert, for example a lid, such that the filter plunger can be operated from the outside via the gripping element. If the insert is a lid, it can serve to guide the filter plunger and to restrict the movement clearance thereof in order to only permit a vertical movement. 
         [0014]    Whereas, in conventional “French-Press” beverage makers, the spout is formed on the receptacle, the present invention makes it possible in particular to configure the spout directly on the insert without there being the risk of the insert dropping together with the spout out of the receptacle during pouring. 
         [0015]    If the insert is designed as a lid with a covering wall which partially covers the receptacle upward and, together with the receptacle, bounds a receptacle interior, the lid, preferably with a skirt extending vertically downward, projects into the receptacle from above and has, preferably on the radial exterior thereof, a circumferential seal which is suitable for producing a seal between the lid and the receptacle in the region of the inner circumferential surface area of the side wall thereof. It is ensured by a seal of this type that, during pouring, liquid cannot escape in an uncontrolled manner between the receptacle and the lid. In this case, the lid skirt which projects into the receptacle can comprise, for example, slot-shaped apertures in order to permit the beverage to be poured out through the apertures via a spout formed on the receptacle. However, the spout may also be formed on the lid itself, as has already been stated above. In this case, the lid preferably has a pouring opening which is arranged between the plunger rod and the spout, perforates the covering wall and forms a connection between the receptacle interior and the spout in order to pour liquid out of the receptacle through the pouring opening via the spout. In this case, it is possible to configure the pouring opening such that it can easily be closed to the outside, for example by an externally accessible lever, in order to minimize heat losses through the lid. 
         [0016]    The insert may be configured as an annular retaining element instead of as a lid, the retaining element being designed to rest, for example by means of a circumferential annular flange, on the upper edge of the receptacle and, thereby, to retain a filter insert. The filter insert then rests, for example by means of a supporting flange, on the retaining element and serves to separate solid parts in the beverage from liquid parts. The filter insert then preferably has a preferably cylindrical side wall extending in a vertical direction from an upper end region to a lower end region of the filter insert, and a bottom part which is connected to the side wall and downwardly bounds the filter insert. The retaining element projects at least partially from above into the receptacle. The spout may be formed either on the receptacle or on the retaining element. In a preferred embodiment, the spout is formed on the receptacle and the retaining element has a skirt which extends into the receptacle and on the outer circumferential surface area of which a circumferential seal is formed. Said retaining element then has at least one aperture, through which liquid can be poured, above the circumferential seal in the skirt. 
         [0017]    In one possible embodiment, the receptacle holder comprises an upper ring which embraces the side wall of the receptacle, and a plurality of struts which extend in the longitudinal direction of the receptacle and are connected indirectly to one another in the lower region of the receptacle, for example via a lower embracing ring, or are connected directly to one another below the bottom surface of the receptacle. 
         [0018]    For easy grasping of the beverage maker, the receptacle holder may have a handle. However, the receptacle may, for example, also have an integrated handle itself, which handle can be manufactured, for example, integrally with the receptacle. 
         [0019]    The protruding element may be arranged adjacent to the upper end of the handle belonging to the receptacle holder, i.e. therefore diametrically opposite the spout, and may be connected to said end, for example via a fixing screw. In particular, said element may be in the form of a bow which, in the region of one of the two limbs thereof, has a recess for receiving a lug or a stud on the insert. 
         [0020]    However, the receptacle holder may also itself protrude with a side wall region over the upper edge of the receptacle, for example with an annular region embracing the receptacle in the region of its upper end. Said region preferably extends over a considerable angular range, for example over at least 30°. Said protruding region of the receptacle holder may comprise as the first engagement structure at least one groove, preferably two diametrically opposite grooves, on its inner circumferential surface area, said groove or grooves acting as a bayonet joint, for example together with one or two lugs fitted on an outer circumferential surface area of the insert. The groove may consist, for example, of a vertical, upwardly open inlet groove and of a horizontal radial groove which extends from the latter in the circumferential direction, in order to permit simple and rapid locking of the receptacle to the insert. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0021]    Preferred embodiments of the invention are described below with reference to the drawings, in which: 
           [0022]      FIG. 1  shows a perspective view of a beverage maker according to a first embodiment in the unlocked state; 
           [0023]      FIG. 2  shows a perspective view of the beverage maker from  FIG. 1  in the locked state; 
           [0024]      FIG. 3  shows a central longitudinal section in the plane A-A through the beverage maker from  FIG. 1 ; 
           [0025]      FIG. 4  shows a perspective view of a beverage maker according to a second embodiment; 
           [0026]      FIG. 5  shows a perspective view of the beverage maker from  FIG. 4  in the unlocked state; 
           [0027]      FIG. 6  shows a perspective view of the beverage maker from  FIG. 4  in the locked state; 
           [0028]      FIG. 7  shows a partial view of a central longitudinal section in the plane B-B through the beverage maker from  FIG. 4 ; and 
           [0029]      FIG. 8  shows a perspective partial view of a partially dismantled beverage maker according to a third embodiment. 
       
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
       [0030]      FIGS. 1 to 3  show different illustrations of a first exemplary embodiment of a beverage maker according to the invention. 
         [0031]    The beverage maker has a cylindrical, upwardly open glass receptacle  1  with a circumferential side wall  13  and a substantially flat, but slightly upwardly curved bottom  12 , a receptacle holder  2  and a lid  3 . In the present illustrations, the glass receptacle is shown in non-transparent (opaque) form but it may also be transparent or translucent. 
         [0032]    A filter plunger  4  is arranged in the glass receptacle, the filter plunger comprising a plunger rod  41 , a knob-shaped actuating element  42  fitted to the upper end of said plunger rod, and a plunger filter  43  of a type known per se which is fitted to the lower end of the plunger rod. The plunger rod is arranged vertically and passes through the lid  3 . The plunger filter  43  comprises an upper perforated plate  431  which is raised at its outer border and is provided with a multiplicity of small openings. A toroidal wire coil  433  is threaded through said openings. A fine wire mesh  432  rests on the lower side of the perforated plate  431  and is drawn upward beyond the wire coil  433 . The wire mesh  432  is downwardly fixed by a star-like or perforated-plate-like fixing plate  434  mounted parallel to the perforated plate below the wire mesh. The perforated plate  431 , the wire mesh  432  and the fixing plate  434  are secured on the plunger rod by a common fixing screw  435  which engages in a counternut  436 . 
         [0033]    The lid  3  projects partially by a skirt-like section  391  into the glass receptacle  1 . A lower covering wall substantially covers the opening in the glass receptacle  1  and, together with the glass receptacle, bounds the receptacle interior  11 . A pouring opening  38  is formed in the lower covering wall  39 . Starting from the lower covering wall  39 , a cylindrical side wall  392  extends upward at the outer border of said covering wall, said side wall being interrupted by a spout  31  and by a recess for a lever  32 . Also starting from the lower covering wall  39 , a circumferential, cylindrical skirt  391  of somewhat smaller diameter extends downward into the receptacle. A pair of annular, spaced-apart webs extends outward from the skirt, forming a receptacle for a circumferential, annular seal  33  having a radially outwardly protruding sealing lip. By this means, after the lid  3  has been inserted, a seal is formed between the receptacle  1  and the lid, the seal preventing liquid from being able to escape between the receptacle and lid. 
         [0034]    An elongate lever  32  which extends above the lower covering wall  39  transversely with respect to the plunger rod  41  is fitted to the lid  3  in a manner such that it can pivot about a horizontal axis. In the region of its front end, the lever comprises a closure body  321  in order to close the pouring opening  38 . At its rear end facing away from the spout  31 , the lever  32  protrudes radially with an actuating region out of the lid  3  and, by pressure being applied by the user&#39;s thumb, can pivot downwards slightly about its horizontal pivot axis such that the closure body  321  is raised from the pouring opening  38  and opens up the pouring opening. In the direction of its first position, the lever is spring-loaded by a helical spring  322  in order to ensure that the pouring opening is closed if the lever is not being consciously actuated. The helical spring  322 , which is preloaded into the closing position, is formed in the rear lever region facing away from the spout  31 , still within the lid  3 . In order to guide the plunger rod  41  through the lid  3 , the lever has a passage opening, but may also be guided laterally around the plunger rod. 
         [0035]    An upwardly curved, double-walled upper dome, consisting of an inner covering wall  36  and an outer covering wall  35 , extends from the upper edge of the cylindrical side wall of the lid  3 . The double-walled configuration of the upper dome minimizes the heat loss through the lid. In addition, this design makes it possible to form the outer covering wall in an aesthetically attractive manner, for example from thin sheet metal, irrespective of any stability requirements. A vertical guide sleeve  351  in which the plunger rod  41  of the filter plunger  4  is guided is inserted into a central opening in the inner covering wall  35 . The lever  32  and the lower covering wall  39  each have a passage opening through which the plunger rod is likewise guided. A further guide sleeve  393  is formed as a single piece with the lower covering wall  39  and extends downward from the latter. 
         [0036]    The receptacle holder  2  comprises a retaining ring  21  which embraces the side wall  13  of the glass receptacle  1  in the upper region of the receptacle, and struts  22  extending in the longitudinal direction of the vessel. In the region where the side wall  13  of the glass receptacle  1  meets the bottom  12 , said longitudinal struts form feet which project outward and downward and permit the beverage maker to be placed onto a flat underlying surface without the glass receptacle  1  which is heated by the beverage coming into contact with the underlying surface. The longitudinal struts  22  are connected to one another below the bottom  12  of the glass receptacle. The upper end of a handle  23  is connected to the retaining ring  21  and the lower end of said handle is connected to the receptacle holder  2  via a transverse strut  27  connecting two longitudinal struts  22 . 
         [0037]    A bow-like element  24  which protrudes over the glass receptacle  1  and has two limbs and a connecting region connecting the latter is fastened to the handle  23  by means of a fixing screw  25 . The element projects beyond the retaining ring  21  and the upper edge of the glass receptacle  1 . A recess which forms a radial groove  26  is formed in the region of one of the limbs of the bow on the part projecting over the glass receptacle. Said radial groove is designed to receive a lug  34  which is fitted to the exterior of the side wall  392  of the lid  3  below the closure lever  32 . By means of a rotational movement over a small angular range and the latching of the lug  34  into the radial groove  26 , a bayonet joint is formed, by means of which the lid  3  can be locked releasably to the glass receptacle  1 . A marking  37  on the exterior of the upper, outer covering wall  35  of the lid  3  indicates the correct positioning for latching and locking the lid  3  to the glass receptacle  1 . 
         [0038]    A further exemplary embodiment is illustrated in  FIGS. 4 to 7  in which identical parts are provided with the same reference numbers as in  FIGS. 1 to 3 . In contrast to the first embodiment, in this embodiment, the beverage maker additionally has a filter insert  6  and an annular retaining element  5  therefor. 
         [0039]    The filter insert  6  has a circumferential side wall and a bottom (not illustrated) which is adjacent to the side wall at the bottom. The cylindrical side wall has a multiplicity of small openings or holes through which liquid can pass but which are smaller than the solid beverage constituents which are intended to be filtered out when preparing the beverage. A circumferential, radially outwardly protruding flange  61  is provided on the upper edge of the filter insert  6 . The flange is used to enable the filter insert to rest on the retaining element  5  into which the filter insert is pushed. 
         [0040]    The filter insert  6  serves to separate solid constituents of the beverage from liquid constituents while the filter plunger  4  is being pressed down. The use of the filter insert enables the plunger filter  43  to be pressed downwards more rapidly and with less application of force because liquid beverage constituents can be displaced not only through the plunger filter itself but also through the side wall of the filter insert  6 . Furthermore, because of the filter insert, the glass receptacle is subjected to a less severe loading when the filter plunger is pressed down, thus reducing the risk of the glass breaking. Finally, the filter insert permits greater design freedom with respect to the shape of the glass receptacle  1 ′. 
         [0041]    The retaining element  5  rests on the upper rim of the glass receptacle  1 ′, the retaining element having for this purpose a radially protruding supporting structure in the form of a circumferential, radial supporting flange  55 . The retaining element extends with an annular, circular-cylindrical side wall (skirt) from above into the glass receptacle  1 ′ to an extent such that said retaining element protrudes downward over the spout  14 ′ which, in this exemplary embodiment, is formed on the glass receptacle  1 ′. A radially outwardly pointing, circumferential sealing lip  52  is formed in the region of the lower end of the retaining element  5 , said sealing lip bearing against the interior of the side wall  13 ′ of the glass receptacle below the spout  14 ′ and thereby producing a seal between the retaining element  5  and the glass receptacle  1 ′. A multiplicity of slot-shaped apertures  53  serving as pouring openings are provided over a small angular range in the side wall of the retaining element. The presence of the sealing lip  52  means that liquid can only pass through said apertures  53  to the spout  14 ′ when the liquid is intended to be poured out of the receptacle. 
         [0042]    The plunger rod  41  is guided through a central opening in a lid  3 ′. The open, lower end of the lid  3 ′ can be pushed into the retaining element  5  and fixed releasably thereto. For this purpose, the retaining element  5  has an upwardly extending annular flange  54  which serves as a receiving ring and extends upward from the radially outer border of the supporting flange  55 . The lid  3 ′ is locked releasably to the retaining element  5  by means of a bayonet joint which is not visible in the drawings. For this purpose, a lug fitted to the radial exterior on the lower border of the lid  3 ′ can be inserted from above into a vertical inlet groove which is formed on the radial interior of the annular flange  54  and which is adjoined by a horizontal radial groove extending over a small angular range of, for example 5°-15° of the flange circumference. By means of a rotational movement of the lid  3 ′, the lug engages in the radial groove, as a result of which the lid  3 ′ is locked releasably to the retaining element  5 . The lid  3 ′ can thereby be fixed releasably in the retaining element  5 . Instead, however, there may also be a simple latching connection. The lid  3 ′ is of double-walled design with an outer covering wall  35 ′ and an inner covering wall  36 ′ which upwardly bounds the receptacle interior  11 ′. 
         [0043]    In order to lock the retaining element  5  releasably to the glass receptacle  1 ′, the retaining element  5  on the radial exterior of the annular flange  54  has a bayonet lug  51  which is fitted to the diametrically opposite side with respect to the apertures  53 . As in the first exemplary embodiment, a bow-like, protruding element  24 ′ is fitted to the receptacle holder and, in this embodiment, is designed to be somewhat longer than in the first exemplary embodiment. The protruding element  24 ′ is fitted to the handle  23  of the receptacle holder  2 ′ by means of the fixing screw  25  and extends upward along the side wall  13 ′ beyond the upper rim of the glass receptacle  1 ′. Said bow-shaped, protruding element  24 ′ also has in the region of one of the limbs thereof a recess which forms a radial groove  26 ′. By means of a rotational movement, the lug  51  of the retaining element  5  can be introduced into the radial groove  26 ′ and can be locked to the latter in the manner of a bayonet joint. By means of the releasably locked connection between the retaining element  5  and the glass receptacle  1 ′, the apertures  53  are directed toward the spout  14 ′ in a well defined position in the locked state, as a result of which the beverage can be poured out through the apertures  53  and via the spout  14 ′. The retaining element  5  or the lid  3 ′ is prevented from slipping by the locking of the two engagement structures  51  and  26 . 
         [0044]    A further exemplary embodiment is depicted in  FIG. 8 . The functional features of this embodiment, with the exception of the latching connection between the lid  3 ″ and the receptacle holder  2 ″, are analogous to the features described in the first exemplary embodiment ( FIGS. 1 to 3 ). 
         [0045]    The receptacle holder  2 ″ protrudes upward with a ring  21 ″, which embraces the glass receptacle, over the side wall  13  of the glass receptacle and along the entire circumference of the side wall  13 . In the protruding part of the ring  21 ″, a first cutout is formed at the upper edge, the cutout leaving space for the spout  31 ″ of the lid  3 ″ and leaving additional space in order to allow a rotational movement of the lid  3 ″ in the ring  21 ″ over a small angular range. On the diametrically opposite side of the first cutout, a second cutout is formed on the upper edge of the ring  21 ″ in order to enable the closure lever  32 ″ to be pressed downward in the locked state. 
         [0046]    In the interior of its circumferential surface area, the ring  21 ″ of the receptacle holder  2 ″ has two identical engagement structures  26 ″ which lie diametrically opposite each other. The engagement structures  26 ″ each consist of a vertically formed, upwardly open inlet groove and a horizontally extending radial groove which is adjacent to the inlet groove in the lower region. The two lugs  34 ″ which are formed on the exterior of the lid  3 ″ and are each arranged at half the angle between the spout  31 ″ and closure lever  32 ″ are configured in such a manner that they can be introduced into the vertical inlet grooves of the engagement structures  26 ″ upon correct insertion of the lid  3 ″. By means of a rotational movement over a small angular range, the lugs  34 ″ are introduced into the radial grooves of the engagement structures  26 ″ and latch therein when the rotational movement is fully executed. As a result, the lid  3 ″ is locked releasably to the receptacle holder  2 ″. 
         [0047]    Of course, the invention is not restricted to the above examples, and a multiplicity of modifications is possible. In particular the two engagement structures  26 ,  26 ′,  26 ″ and  34 ,  34 ″ may also be formed differently, in each case matching each other. Instead of rectangular lugs, for example cylindrical bayonet studs may be present. Instead of the receptacle holder illustrated in the drawings, any other holder may also be used if said holder has an element protruding over the glass receptacle. A differently designed lid with or without a spout and with or without a closure mechanism may also be used. A multiplicity of further applications is possible. 
       LIST OF REFERENCE NUMBERS 
       [0000]    
       
           1 , 1 ′ Glass receptacle 
           11 , 11 ′ Receptacle interior 
           12  Bottom 
           13 , 13 ′ Side wall 
           14 ′ Spout 
           2 , 2 ′, 2 ″ Receptacle holder 
           21 , 21 ″ Ring 
           22  Longitudinal struts 
           23  Handle 
           24 , 24 ′ Protruding element 
           25  Fixing screw 
           26 , 26 ′, 26 ″ Bayonet radial groove 
           27  Transverse strut 
           3 , 3 ′, 3 ″ Lid 
           31 , 31 ″ Spout 
           32 , 32 ″ Closure lever 
           321  Closure body 
           322  Compression spring 
           33 , 33 ″ Sealing ring 
           34 , 34 ″ Bayonet lug 
           35 , 35 ′, 35 ″ Outer covering wall 
           351  Guide sleeve 
           36 , 36 ′ Inner covering wall 
           37  Marking 
           38  Pouring opening 
           39  Lower covering wall 
           391  Skirt 
           392  Side wall 
           393  Guide sleeve 
           4  Filter plunger 
           41  Plunger rod 
           42  Actuating element 
           43  Plunger filter 
           431  Base plate 
           432  Wire mesh 
           433  Wire coil 
           434  Fixing plate 
           435  Fixing screw 
           436  Counternut 
           5  Retaining element 
           51  Bayonet lug 
           52  Sealing ring 
           53  Aperture 
           54  Annular flange 
           55  Supporting flange 
           6  Filter insert 
           61  Supporting flange