Abstract:
A press assembly is adapted to be used with a disposable stackable cup. According to the preferred embodiment, the press includes a filter. A resilient radially compressible support forms a seal is formed between the filter and the interior of the cup. A detachable rod is mounted to the support. The support is sized to accommodate all radii of the cup. As the user presses down the rod, the press assembly is pushed downward to the bottom of the vessel. The seal maintains continual and firm pressure on the inside surface of the vessel so that the pressurized liquid passes through the filter and the infuision substance is trapped.

Description:
FIELD OF THE INVENTION  
       [0001]     This invention relates to the field of beverage infusion. More particularly, this invention relates to a press type infusion system for making coffee and tea which is adaptable for stackable and disposable cups.  
       BACKGROUND OF THE INVENTION  
       [0002]     The essence of a solid material can enter a liquid through a process known as infusion, wherein the solid material is placed into a liquid for a sufficient period of time and the essence passes from the solid material into the liquid. In a well known infusion process, the essence of coffee, including flavor, color and often caffeine enter heated water. It will be readily understood by those of ordinary skill in the art that caffeine is substantially not available to enter the liquid when the coffee has been decaffeinated. There are many conventional coffee makers that can be used to perform the process and include a percolator and drip type coffee maker. In such coffee makers, hot water is passed through the coffee grounds using gravity. A known quality of the coffee beverage is produced using such methods. In a percolator, the water is continuously heated and repeatedly passed through the grounds. In addition, coffee bags similar to conventional tea bags have also been introduced, wherein a filter bag of ground coffee is dipped into a hot cup of water using a string.  
         [0003]     The coffee grounds are held together in each of a percolator, drip and bag infusion approach. In a conventional drip type coffee maker, ground coffee is held in a conical filter and appropriately sized filter housing. Hot water is poured into the ground coffee and passed once through the coffee grounds. In another well known process in an espresso machine, heated water and/or steam is forced through compressed coffee grounds to perform the infusion process.  
         [0004]     Often, for dispensing of coffee drinks, a full pot of coffee is made and then maintained at a high temperature to be ready for dispensing to and consumption by a consumer. Unfortunately, the continual application of heat to prepared coffee can burn the coffee, thereby deteriorating its flavor and desirability. Also, coffee that is made and stored in an insulated thermal pot quickly degrades in its flavor. Though the precise mechanism for the degradation of the prepared and stored coffee is not well known, it is possible that the degradation occurs through a chemical reaction, such as by oxidation. In any case, it is generally recognized and accepted that freshly made coffee has superior flavor to ‘old’ coffee.  
         [0005]     Tea, herbal tea, medications, chemical preparations and other liquids can also be produced using infusion. Tea bags are well known for infusing tea. However, some tea drinkers have long believed that loose teas provide a superior tea beverage to tea bags. One theory is that the hot water is provided free unrestricted access to all surfaces of the tea. This is especially true when the preparer stirs the loose tea in vessel while steeping the beverage. However, owing to the substantial convenience of tea bags relative to the clean-up problem associated with loose tea in the bottom of a pot, the use of tea bags is universally accepted and preferred. Though it will be recognized that infusion can take place for coffee, tea, herbs, medicines, or chemicals as well as other substances into water and/or other liquids, to avoid unnecessarily complicating the following discussion with extraneous detail, the remainder of this document will refer only to coffee, though other beverages and infusions are contemplated.  
         [0006]     The press or so-called French Press is well known for making superior coffee infusions.  FIG. 1  shows a conventional coffee press. A vessel  100  is provided for steeping the beverage. A measure of coffee grounds or tea  102  is provided in the vessel  100  along with hot water  104 . The preparer can stir the hot water  104  during the infusion process to better promote the amount of infusion that takes place as desired. Once the desired extent of infusion is achieved, the preparer activates the press assembly  106  to slow or stop the infusion process.  
         [0007]     To stop the infuision process, a conventional press assembly  106  is provided to confine the coffee grounds separate from the infused liquid coffee. The preparer depresses the press assembly  106  to the bottom of the vessel  100 . This action traps the coffee grounds  102 ′ between the press assembly and the bottom of the vessel  100  ( FIG. 2 ). Thereafter, the infused coffee beverage  104 ′ can be dispensed from the vessel  100  without any coffee grounds  102  or  102 ′ being present in the beverage to detract from the enjoyment of the beverage.  
         [0008]     The press assembly  106  includes a filter screen  108 . The filter screen  108  is configured to easily pass water but not coffee grounds. The conventional press assembly  106  includes a filter screen  108  which has openings sized to allow water or liquid to pass there through but to prevent coffee grounds from escaping above the filter into the beverage to be dispensed. Conventional filters in a French Press are formed of a pliant, flexible screen having small apertures to allow passage of the infused liquid. Conventionally, the filter screen  108  is slightly larger than the size of the opening of the vessel  100  to ensure that the filter screen  108  maintains positive and intimate contact with the interior surface of the vessel  100 . Generally, the edges of the filter screen  108  are turned up. A pressing plate  110  is mounted over the filter screen  108 . The pressing plate  110  includes a plurality of apertures to expose the filter screen  108  to the liquid. A coiled pressure spring  112  is circumferentially mounted to and around the exterior of the pressing plate  110  as well as adjacent and within the turned up edges of the filter screen  108 . In this way, as is well known the pressure spring  112  applies outward pressure on the filter screen  108 , to hold the filter screen  108  firmly against the inner wall of the vessel  100 . This pressure prevents coffee grounds from escaping past the filter screen. Once the appropriate level of infusion has occurred, the user then depresses the press assembly using a plunger rod  114 . Most press assemblies also include a vessel lid  116  and a rod end  118  for comfort to the user and also to prevent the lid from being removed from the rod  114 .  
         [0009]     For a conventional coffee press, it is important that the interior radius of the vessel be constant from its upper opening to its base. This allows the press assembly  106  to engage the inner wall of the vessel  100  from the top of the vessel  100  and throughout the traverse of the press assembly until it reaches the bottom of the vessel  100 . As the press assembly  106  is pressed downwardly, the pressure of the liquid becomes greater under the filter screen  108 . The increased pressure causes the infused liquid to pass through the filter screen leaving the coffee grounds  102  below the press assembly  106  and trapped against the bottom of the vessel  100 . In the event that the radius of the vessel  100  is not constant and increases even momentarily causing a void between the press assembly  106  and the vessel  100 , such as by a swelling of the vessel or owing to some other defect in a sidewall of the vessel  100 , the pressurized liquid will seek to escape to the region above the press assembly  106  and pass rapidly through the void. Hence, in nearly every occurrence the void will cause coffee grounds to escape from below the press assembly  106  through the void. Generally, the liquid passing through the void forms a turbulent relatively high speed stream. Once this occurs, the user is unfortunately subjected to drinking coffee having undesirable coffee grounds contained therein. Drinking a coffee beverage that contains coffee grounds is unpleasant.  
         [0010]     It is generally accepted that press made coffee and tea is superior to such beverages made by other techniques. However, in spite of the superior beverage made with a press, infusion presses have only gained limited acceptance. One reason for this limited acceptance is related to the difficulty and necessity surrounding cleaning the press. Upon completion of a pot of coffee made from a press, the press element must be removed from the vessel. Then, the grounds must be removed from the vessel. The removal of the grounds is a messy operation generally resulting in substantial grounds going down the drain.  
         [0011]     Others have developed single serving sized press cups. These cups are sized to allow a user to prepare a single serving of press beverage. Unfortunately, as will be explained in more detail below, because the radius of the cup must be constant from its top opening to the bottom, the single serving sized press cups are made of glass, plastic or porcelain and hence are not economically disposable. This makes such cups unsuitable for several reasons. First, the cup and press assembly must be thoroughly cleaned to remove the trapped grounds after each cup is prepared and dispensed. The process of cleaning a press vessel is cumbersome in that it requires the press assembly to be withdrawn and then the coffee grounds to be removed before the washing process. Care must generally be taken to avoid allowing the grounds to pass into a sink or drain. Too many coffee grounds in the drain can cause the sink or drain to clog. Second, because such single sized press cups are not disposable, users cannot purchase a ‘to go’ cup of pressed coffee. This is unfortunate because pressed coffee is generally considered to be vastly superior in flavor to brewed or dripped coffee, even ‘on the go.’ 
         [0012]     For many applications involving dispensing of drinks, especially for the vending of drinks in a disposable cup, it is desirable that each of the cups  300  have a wider radius at their opening than at their bottom as shown in  FIG. 3 . Generally the dimension of the radius of each cup  300  varies linearly and decreases from the opening to the bottom. Such cups  300  have the shape defined in mathematics as a right circular conical frustum. This conical frustum shape allows users to nest the cups together in convenient stacks in the usual way as schematically shown in  FIG. 3 . The cups in  FIG. 3  generally show a commonly available paper cup found in many coffee restaurants. Each of these cups  300  is formed of a paper side wall  302 . The sidewalls are formed into a conical shape and adhesively seamed. A lip  304  is formed at the top of the cup  300  by a rolled rim of the same paper used to form the sidewalls  302 . As is known, the lip  304  can be partially rolled or formed into a small tube. A bottom  308  is adhesively attached into each paper cup  300 . The cup in  FIG. 3  is representative only. It is well known that a variety of cup configurations are commercially available which generally have a conical frustum shape.  
         [0013]     As is well known, the use of nesting allows a large number of cups to be stored in a relatively small space. Were it not for the ability to nest cups in this way, it would be impractical for drink vendors which use disposable cups to economically maintain a sufficient inventory of cups on hand in an small location.  
         [0014]     It is readily apparent that a conventional press assembly cannot be used with a conical frustum cup because of the varying radius of the cup. If the press assembly  106  was appropriately sized to fit the radius of the cup near the bottom, the press assembly  106  would not make contact with the interior of the cup at the upper region thereby failing to keep the coffee grounds below the press assembly  106 . Likewise, if the press assembly was appropriately sized to fit the radius of the cup near the opening at the top of the cup  300 , it would be unable to be pressed to the bottom of the cup  300 . If the press assembly is unable to reach to the bottom of the cup, the beverage is unavailable for consumption by the user. Either situation is unacceptable. Owing to at least these failures, no one heretofore has introduced a press assembly for single sized disposable conical frustum cup.  
         [0015]     What is needed is a press assembly that can be used in a cup or vessel that has a radius which varies in size. What is further needed is a press assembly that can be used in a cup that has a radius that decreases linearly from the upper opening to the bottom of the cup. Further, a press assembly is needed for use in a conical frustum cup which is readily disposable.  
       BRIEF SUMMARY OF THE INVENTION  
       [0016]     The present invention is for a press assembly adapted to be used with a vessel having a conical frustum shape, such as a conventional stackable disposable coffee cup. According to the preferred embodiment, the press includes a filter and a pressing member used for support which are radially compressible. The filter is preferably formed of an open cell foam. The foam includes apertures sized such that water or other liquid can pass through the foam but particles the size of coffee grounds cannot pass. A particle tight seal is formed between the filter and an interior surface of the cup. A radially compressible pressing member is sized to have a range of radii sufficient to allow the pressing plate to substantially maintain intimate contact with the interior surface of the cup from the top of the cup to the bottom and over a range of radii. A pushing rod is mounted to the pressing member to allow a user to push the pressing plate to the bottom of the cup. Preferably, the pushing rod is separate but attachable to the pressing plate.  
         [0017]     A user places a measure of an infusion substance, such as coffee into a conical frustum vessel, such as a stackable disposable cup, and allows the beverage to infuse a desired amount. In anticipation of the conclusion of the infusion process, the user installs the press assembly by inserting it into the open top end of the vessel. In many circumstances the user will choose to stir the beverage to enhance and/or speed the infusion process; in such circumstances, the installation of the press assembly can be delayed. Preferably, the resilient radially compressible seal will fit snugly into the opening. As the user presses down the rod, the press assembly is pushed downward to the bottom of the vessel. The radius of the pressing member varies to accommodate the varying radii of the cup. In this way, the pressing member causes the filter to maintain continual and firm pressure on the inside surface of the vessel so that the pressurized liquid passes through the filter and the infusion substance is trapped.  
         [0018]     The preferred embodiment of the present invention contemplates several optional enhancements. The radially compressible pressing plate can include a plurality of small hook elements to engage and hold the foam filter. The pushing rod can be detached and attachable either by friction or by a snap fit to provide more efficient packaging of multiple filter assemblies within a shipping carton. A cup lid can include a hole adapted to receive the plunger rod, such that the press assembly can be mounted within the cup but not deployed to compress the coffee grounds into the bottom of the cup. Thus, during the infusion process the cup lid can be securely mounted in place to protect the user and their belongings.  
         [0019]     The plunger rod can include an expanded flat head with a T-shaped cross section to provide enhanced comfort to the user when deploying the press assembly. The length of the pushing rod can be sized such that the top is approximately coplanar with the cup lid once the press assembly is deployed. A plurality of press assemblies packaged in a shipping carton can include a selection of plunger rod sizes to accommodate a variety of cup sizes. Alternatively, the plunger rod can include features to enhance breaking the plunger at predetermined lengths to accommodate a variety of cup sizes. Each of these break-enhancing features can be immediately above a corresponding series of T-shaped heads.  
         [0020]     According to the preferred embodiment, the press assembly includes a circular foam filter. The diameter of the foam filter is sized to be slightly larger that the upper inner radius of the cup. The foam filter is sufficiently compressible that it will readily compress to fit within the lower inner radius of the cup as well. The foam filter is only thick enough to provide adequate filtering characteristics and prevent coffee grounds from entering the beverage above the press assembly. However, the foam filter is made as thin as possible to avoid consuming substantial volume in the cup. A radially compressible filter support is mounted to the foam filter to aid in maintaining the foam filter in close contact with the interior surface of the cup. A rod is mounted to the radially compressible filter support to allow a user to push the filter assembly to the bottom of the cup.  
         [0021]     This invention contemplates several alternate embodiments. In one alternate embodiment, the foam filter is sufficiently thick or rigid to maintain adequate contact with the interior of the cup without the use of a radially compressible pressing plate. Generally, the foam-only press assembly preferably uses a foam that is anisotropic, in that it compresses more readily inwardly along the radius of the cup rather than parallel to the plunger rod.  
         [0022]     In a second alternate embodiment, a compressible resilient annular ring is adapted to contact the interior of the cup. The ring includes a central major aperture. The major aperture is covered with a conventional filter made of paper or a screen. It is important that the seal between the resilient radially compressible seal be sufficiently snug to prevent any particles from passing by the press assembly. In this way, as the press assembly of the present invention is moved to the bottom of the vessel, the liquid and infusion material do not pass between the resilient radially compressible seal and the side wall of the vessel. Rather, the liquid passes through the filter. Thus, solid particles, such as all the coffee grounds, are trapped below the press assembly.  
         [0023]     In one version of this alternative, the annular ring is formed of a foam ring. In this embodiment, the foam ring may but need not also act as a filter. The foam ring has an outer radius and an inner radius; the major aperture is formed within the inner radius. The foam ring is sized to fit within the opening of the vessel under zero or slight radial compression. A pressing plate having a plurality of openings is mounted to an upper surface of the foam ring. The pressing plate is sized having a radius larger than the inner radius and smaller than the outer radius of the foam ring. Further, the radius of the pressing plate is sufficiently small that the pressing plate can readily fit within the bottom of the vessel. The pressing plate also includes a cup shaped receiver sized to receive and hold by friction a pushing rod. The pressing plate can be attached to the foam ring by adhesive or alternatively, by integrally formed The rod is of a size and length to remain only slightly out of the vessel after the press assembly is fully pressed into the vessel.  
         [0024]     A filter screen or filter paper is mounted to cover the aperture through the foam ring. The filter can be adhesively attached to the foam ring. The filter can be mounted to a lower surface of the foam ring, or preferably is mounted to the upper surface of the foam ring between the foam ring and the pressing plate. In this way, the pressure on the foam ring by the pressing plate firmly holds the filter in intimate contact with the foam ring thereby preventing any escape of the infusion substance.  
         [0025]     It is expected that the ring, pressing plate and filter will be pre-assembled during manufacture. This allows several of these pressing sub-assemblies to be stacked compactly upon one another. Upon deployment of the press assembly, the user can readily insert the pressing rod into the receiver. In yet another version of this embodiment, the ring is mechanically compressible.  
         [0026]     Another alternate embodiment contemplate several articulated leaf elements rotatably mounted to one another such that the assembly is formed in a ring that has an interior radius and an exterior radius. As the leaves rotate relative to one another, the exterior radius changes. A filter element, such as a foam filter or a paper filter covers the interior opening of the ring. A rod is coupled to the assembly for pushing it to the bottom of a cup. 
     
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
       [0027]      FIG. 1  shows a schematic cross section of a prior art coffee press with the press assembly in a raised, undeployed condition.  
         [0028]      FIG. 2  shows a schematic cross section of the prior art coffee press of  FIG. 1  with the press assembly in a lowered, deployed condition.  
         [0029]      FIG. 3  shows a cross section of a stack of prior art beverage cups.  
         [0030]      FIG. 4  shows a perspective view of a first embodiment of the present invention, in relation to a perspective section of a beverage cup.  
         [0031]      FIG. 5  shows a side view of the embodiment of the present invention of  FIG. 4 , in relation to a cross section of the beverage cup prior to engagement of the press assembly with the cup.  
         [0032]      FIG. 6  shows a side view of the embodiment of the present invention of  FIG. 4 , in relation to a cross section of the beverage cup as the press assembly is engaged with the cup.  
         [0033]      FIG. 7  shows a side view of the embodiment of the present invention of  FIG. 4 , in relation to a cross section of the beverage cup as the press assembly is deployed to the bottom of the cup.  
         [0034]      FIG. 8  shows a perspective view of a second embodiment to the press assembly.  
         [0035]      FIG. 9  shows a perspective view of a third embodiment to the press assembly.  
         [0036]      FIG. 10  shows a plan view of the preferred embodiment to the press assembly of the present invention.  
         [0037]      FIG. 11  shows a plan view of an alternate embodiment of the press assembly of  FIG. 10 .  
         [0038]      FIG. 12  shows an exploded view of the preferred embodiment of the present invention, in relation to a perspective section of a beverage cup.  
         [0039]      FIG. 13  shows a cross section view of the preferred rod of the present invention.  
         [0040]      FIG. 14  shows a side view of the embodiment of the present invention of  FIG. 12 , in relation to a cross section of the beverage cup as the press assembly is engaged with the cup.  
         [0041]      FIG. 15  shows a side view of the embodiment of the present invention of  FIG. 12 , in relation to a cross section of the beverage cup as the press assembly is deployed to the bottom of the cup.  
         [0042]      FIG. 16  shows a partial plan view of the preferred embodiment of the present invention.  
         [0043]      FIG. 17  shows a perspective view of the preferred embodiment of the present invention including packaging features. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0044]     The present invention is described in reference to the drawings appended to this document. Where elements are identical among more than one view or embodiment, the same reference numerals are used to avoid confusion.  
         [0045]     The present invention is principally directed toward a press assembly for use in making a coffee or tea infused beverage. The press assembly of the present invention is configured to intimately engage the interior wall of a conical frustum cup, such as found in any coffee vending store or restaurant. Ideally, the press assembly is capable of being manufactured at a cost sufficiently low that it is commercially feasible for use as a disposable item while adding only insignificantly to the cost of preparing and serving a cup of coffee. In particular, it is anticipated that a vendor of coffee beverages desiring to sell a superior cup of coffee will offer their customers a pressed cup of coffee. In this way, a convenient rapid method of preparing a single cup of coffee is provided, such that larger batches of coffee need not be prepared and stored to undesirably allow the coffee to degrade.  
         [0046]     Conventional commercial coffee vending occurs in disposable cups having a conical frustum shape. In use, the disposable press assembly of the present invention is also used disposably. In particular, a vendor will place a measure of ground coffee into a disposable cup. The cup will typically be a disposable conical frustum. The vendor will then pour hot water into the cup to infuse the essence of ground coffee into the liquid. A disposable press assembly will be engaged into the upper portion of the cup. After a suitable period of time to allow sufficient infusion to suit the taste of the user, a rod mounted to the press assembly will be employed to push the press assembly and thus the ground coffee to the bottom of the cup and be separate from the beverage. It is possible for a user to place a lid of the usual kind but having a hole positioned to accept the rod onto the top of the cup while the beverage is being infused. It is possible for a user to put cream, milk or a creamer into the liquid either before the press assembly is placed into the cup or onto of the press assembly, and either before or after the infusion process.  
         [0047]      FIG. 4  shows a perspective view of a first embodiment of the present invention, in relation to a perspective section of a beverage cup  404 . A filter membrane  400  is used to separate the coffee grounds from the beverage. The filter membrane  400  can be of any convenient type but is preferably a paper filter. The filter membrane  400  is supported from below by a compressible structure  402 . The compressible structure  402  can be formed of foam, such as either a closed cell or open cell foam. Preferably, the foam is formed of an anisotropic foam so that is compresses radially more readily than it compresses vertically. The foam is formed or cut as a ring such that the filter membrane  400  has direct access to the liquid. The foam maintains positive contact with the interior surface of the cup  404 .  
         [0048]     A pushing assembly  406  includes a pressing plate  408  and a rod  410 . The pressing plate  408  is preferably circular and has a radius smaller than the smallest interior radius of the cup  404 . The rod  410  is preferably sized to just allow a user to fully deploy the press assembly to the bottom of the cup, but not leave a long projection once deployed to poke the user or interfere with drinking the beverage. Preferably, the rod  410  is sized to be substantially coincident with the top of the cup  404 , or with the upper surface of a lid ( 414  in  FIG. 7 ), if a lid is employed. Ideally, pressing plate  408  and the rod  410  are formed of plastic and are injection molded. The pressing plate  408  and the rod  410  can be configured as two pieces which are joined by mating the rod  410  to an aperture formed in the pressing plate  408  or integrally formed as a single molded piece. The pushing assembly  406  can be assembled by an adhesive or preferably with barbs  412  formed in a bottom surface of the pressing plate  408  to penetrate and engage the foam compressible structure  402 .  
         [0049]      FIG. 5  shows a cup which contains coffee grounds  102  and hot water  104  for the infusion process. The press assembly is brought to but is not yet engaged with the cup  404 .  FIG. 6  shows a side view of the embodiment of the present invention of  FIG. 4 , in relation to a cross section of the beverage cup as the press assembly is engaged with the cup  404 . A user manually compresses the compressible structure  402  while inserting the press assembly into the cup  404 . After the completion of the infusion process, the user pushes the rod  410  to push the press assembly to the bottom of the cup as shown in  FIG. 7 . The ground coffee is pushed to the bottom of the cup and kept below the press assembly and within the ring of the compressible member  402 .  FIG. 7  shows the construction with a lid  414  mounted to the cup  404 . The lid  414  includes a first aperture to receive the rod  410 . The lid  414  can include a second aperture to allow the user to drink the beverage while both the lid and the press assembly are in place.  
         [0050]      FIG. 8  shows a perspective view of an alternate embodiment to the press assembly. A plurality of overlapping leaves  1100  are mounted to one another about hinge axes  1102 . The assembly is formed in a ring having an interior opening with an interior radius and also an exterior radius. As the leaves  1100  rotate inwardly about the hinge axes  1102 , the exterior radius of the assembly decreases. The shape of the outer edge of each leaf  1100  is appropriately curved so that the exterior circumference of the assembly maintains intimate contact with the interior of a conical frustum cup. A paper filter (not shown) can be adhesively attached to cover the interior opening to filter coffee. A pressing assembly and rod (not shown) can be employed to push the assembly of  FIG. 8  to the bottom of the cup. Preferably the pressing assembly attaches to at least three of the hinge axes  1102 .  
         [0051]      FIG. 9  shows a perspective view of a third embodiment of the present invention, in relation to a perspective section of a beverage cup  404 . A compressible filter member  800  is used to separate the coffee grounds from the beverage. The filter member  800  can be formed of foam, such as either a closed cell or open cell foam. Preferably, the foam is formed of an anisotropic foam so that is compresses radially more readily than it compresses vertically. The filter member  800  maintains positive contact with the interior surface of the cup  404 .  
         [0052]     A pushing assembly is provided. The pushing assembly can, but need not be identical to the pushing assembly described relative to the first embodiment in  FIG. 4 . If is it identical, the pushing assembly  406  includes a pressing plate  408  and a rod  410 . The pressing plate  408  is preferably circular and has a radius smaller than the smallest interior radius of the cup  404 . The rod  410  is preferably sized to just allow a user to fully deploy the press assembly to the bottom of the cup, but not leave a long projection once deployed to poke the user or interfere with drinking the beverage. Preferably, the rod  410  is sized to be substantially coincident with the top of the cup  404 , or with the upper surface of a lid ( 414  in  FIG. 7 ), if a lid is employed. Ideally, pressing plate  408  and the rod  410  are formed of plastic and are injection molded. The pressing plate  408  and the rod  410  can be configured as two pieces which are joined by mating the rod  410  to an aperture formed in the pressing plate  408  or integrally formed as a single molded piece. The pushing assembly  406  can be assembled by an adhesive or preferably with barbs  412  formed in a bottom surface of the pressing plate  408  to penetrate and engage the foam compressible structure  402 .  
         [0053]      FIG. 10  shows the pressing plate  900  of the preferred embodiment of the present invention. The pressing plate  900  is adapted to fit and compress within a conical frustum cup having a large upper radius shown by the dotted line  902  and a small lower radius shown by the dotted line  904 . A central aperture  906  is adapted to receive a rod ( FIG. 11 ). An inner ring  908  surrounds the central aperture  906 . A plurality of arms  910  extend from the inner ring  908  in a spiral manner all extending in the same direction. The spiral shape is any general spiral shape. There are four arms  910  shown in the embodiment of  FIG. 9 . This number of arms is exemplary only; the invention can be implemented with less or more arms. The arms  910  are preferably thin as shown but thicker in the dimension perpendicular to the plane of the drawing of  FIG. 10 . This allows the arms  910  to resiliently flex in the plane of the drawing of  FIG. 10  but to be relatively rigid perpendicular to the drawing. Barbs ( 1204   FIG. 12 ) for engaging a compressible filter member extend into the plane of the drawing and are shown below in  FIG. 12 . Preferably all the elements of the pressing plate  900  are integrally formed of injection molded plastic.  
         [0054]      FIG. 11  shows another version of this preferred embodiment. As will be discussed below, the preferred pressing plates  900  and  1000  are used with a compressible filter member. That filter member is also flexible. The spacing between the arms  910  in certain circumstance may allow the filter member to flex upwardly into the cup between the arms  910 . Depending upon the amount of bending deflection and support for the filter ( FIG. 10 ) that is desired, a stabilizing ring  912  can be employed.  
         [0055]     The user manually compresses the arms  910  to insert the pressing plate  900  and  1000  into the top of a cup. The arms  910  are sufficiently thin and flexible to readily bend, yet are sufficiently resilient that the elastic restoring force of the material presses the arms  910  outwardly toward the interior surface of the cup. As the rod (not shown) is used to deploy the pressing plate  900  toward the bottom of the cup, the arms  910  progressively overlap one another and the external radius of the pressing plate decreases.  
         [0056]      FIG. 12  shows a side view of the preferred embodiment of the present invention. The filter member is a foam filter  1200  which is sized to be somewhat larger than the upper radius of the cup  404 . Preferably, the radius of the foam filter  1200  will have a radius that is between ¼ inch to ½ inch larger than the upper radius of the cup  404 . The foam filter  1200  is preferably formed of an open cell or a closed cell polypropylene or polyethylene. Voids formed in the foam filter  1200  are sized sufficiently large to allow liquid to pass through the foam filter  1200  but not particles such as ground coffee; preferably, no filter membrane such as a paper filter is used.  
         [0057]     A compressible pressing plate  1202  ( 900   FIG. 10  or  1000   FIG. 11 ) is adapted to attach to the foam filter  1200  using barbs  1204  which are integrally formed with the pressing plate  1202 . The barbs  1204  can be formed to extend from the arms  910  ( FIGS. 10 and 11 ) or the stabilizing ring  912  ( FIG. 11 ) or both. While the drawing of  FIG. 12  shows a gap the length of the barbs  1204  between the pressing plate  1202  and the foam filter  1200 , in operation, the barbs  1204  will penetrate into the foam filter  1200  and the gap will be reduced, in some cases to zero. The pressing plate  1202  mounted to the foam filter  1200  is a compressible filter assembly  1201 .  
         [0058]     A rod  1206  is mounted to pressing plate  1202 . In the preferred embodiment, the rod  1206  is separate from the pressing plate  1202 . In such a construction, the pressing plate includes a socket  1208  (corresponding to  906   FIGS. 10 and 11 ) to receive the rod  1206 . The rod  1206  can include a protrusion  1210  adapted to engage the socket  1208 . In the alternative, the rod  1206  and the pressing plate  1202  can be formed integrally as a single unit. The combination of the rod  1206  and the compressible filter assembly  1201  is the press assembly  1203 . The rod  1206  and the pressing plate  1202  are preferably formed of injection molded plastic.  
         [0059]     The rod  1206  preferably includes a T-shaped expansion  1212  at the distal end which is adapted to provide a more comfortable pushing surface for a finger or thumb of a user. Ideally, once the press assembly  1203  is mounted to the cup  404 , a lid  1214  is mounted to the cup  404  over the press assembly  1203 . An aperture  1216  is formed or cut in the center of the lid  1214  to accommodate the rod  1206 . When the press assembly  1203  is deployed to the bottom of the cup  404 , the expansion  1212  preferably substantially fills the aperture  1216 . Alternatively, the expansion  1212  is pushed to a level sufficiently close to the lid  1214  where it will not interfere with a user comfortably drinking the beverage while the deployed press assembly  1203  is in place.  
         [0060]     Ideally, the amount of compression possible in a compressible filter assembly  1201  can accommodate a variety of sizes of cups  404 . It will be apparent that a rod  1206  that accommodates a large cup will extend beyond the lid  1214  for a small cup. A variety of sizes of rods  1206  can be provided. However,  FIG. 13  shows a rod  1406  which is adaptable to a number of sizes of cups. The rod  1406  includes a protrusion  1410  to mate with the socket  1208  ( FIG. 12 ). The rod  1406  also includes an expansion  1412  at the distal end of the rod. The rod  1406  also includes one or more selectable expansions  1420 . Immediately toward the distal end of the rod  1406  from each selectable expansion  1420  the rod has a thinned region  1430 . Each thinned region  1430  is sufficiently thick to allow the rod to be used in its entirety. Each thinned region  1430  is sufficiently thin to allow a user to readily break the rod. Preferably, the central portion of each selectable expansion  1420  is depressed so that if the rod is broken at one of the thinned regions  1430 , any sharp portion of plastic remaining after the break is safely below the surface of the selectable expansion  1420  which remains at the new distal end of the rod  1406 .  
         [0061]      FIG. 14  shows the pressing assembly  1203  mounted into a cup  404 . The filter member  1200  ( FIG. 12 ) is pressed between the pressing plate  1202  and the interior surface of the cup  404 . The filter member  1200  also wraps around the pressing plate  1202  as shown. In  FIG. 14 , the lid  1214  is mounted in place.  FIG. 15  shows the cup  404  and pressing assembly  1203 , once the pressing assembly  1203  is deployed to the bottom of the cup. The top of the rod  1206  is substantially coincident with the lid  1214  so that the beverage can be conveniently and comfortably consumed.  
         [0062]      FIG. 16  shows a partial expanded view of the overlapping arms  910  within the cup  404  with the filter member  1200  interposed in between. As the arms  910  slide over one another it is preferable that the profile of the tip of each arm  910  be sufficiently small to avoid puncturing and thereby tearing the filter member  1200 . The profile of the leading edge of each tip can be adjusted to properly compensate for the thickness of the arms  910 , the characteristics of the foam in the filter member  1200  including such factors as density, friction porosity and the like. Moreover, any irregularities in the profiles, owing either to the overlap of tip of one arm  910  relative to another arm or to uneven bending of an arm  910  owing to manufacturing variances will be advantageously filled by the filter member  1200 .  
         [0063]     The rod  1206  and the pressing assembly  1201  are preferably formed separately to accommodate packaging the devices for shipment. For example,  FIG. 17  shows a paperboard container  1400  can be constructed to hold a number of compressible filter assemblies  1201  which are stacked, one on top of the next as shown. The container  1400  can include a segregation storage wall  1402  for holding a corresponding number of rods  1206  and/or  1406 . The container  1300  can include a folded flap  1304  to act as a lid, in the usual manner of paperboard containers. Alternatively, the container  1300  can include a removable lid (not shown). When the rod  1206  and the compressible filter assembly  1201  are separate, the shipping density is enhanced.  
         [0064]     The invention has been described relative to certain preferred and alternate embodiments. The selection of those particular embodiments are not intended to be limiting of the invention. It will be apparent to those of ordinary skill in the art after reading the disclosure, reviewing the drawings and the appended claims that certain changes and modifications are apparent. Such variations are within the scope of this invention.