Abstract:
A coffeemaker that heats up water in water tanks and supplies the heated water into a coffee funnel that has ground coffee and further collects liquid coffee dripping from the coffee funnel; the coffeemaker including an iced coffee tank, which collects the liquid coffee that drips from the coffee funnel, and an ice water tank, which accommodates the iced coffee tank and contains ice water that cools the liquid coffee inside the iced coffee tank via the walls of the iced coffee tank; and a relative difference in rotational speed being given to the iced coffee tank and the ice water inside the ice water tank.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a coffeemaker that makes iced coffee using ground coffee. 
   2. Prior Art 
   Generally two types of coffeemakers are known. One is a drip type and the other is a paper filter type. In such coffeemakers, coffee is extracted by pouring high temperature hot water into a coffee funnel that has ground coffee therein, and the liquid (extracted) coffee that drips from this coffee funnel is collected. 
   In the coffeemakers disclosed in Japanese Patent Application Laid-Open (Kokai) No. 61-179115 and Japanese Utility Model Application Laid-Open (Kokai) No. 59-7732, high-temperature hot water obtained by way of heating water in a water tank by a heater is poured into a chamber (coffee funnel) that contains ground coffee, and high-temperature liquid coffee that drips from this chamber passes through an ice chamber that contains ice, and cooled liquid coffee is collected in a decanter that is set beneath this ice chamber. In short, in these coffeemakers, high-temperature liquid coffee is cooled by pouring it into ice. 
   In the coffeemaker disclosed in Japanese Patent Application Laid-Open (Kokai) No. 2000-184966, high-temperature liquid coffee that drips from a chamber (coffee funnel) is conducted either directly into a pot or into a coffee cooling device via a conduit, and the coffee is cooled in this coffee cooling device. In regard to this coffee cooling device, this prior art merely describes that the cooling device is the one conventionally used, and no description of the internal structure of the coffee cooling device is described. 
   The coffeemaker disclosed in Japanese Utility Model Application laid-Open (Kokai) No. 04-121835 causes high-temperature liquid coffee to drop into a container, conducts the high-temperature liquid coffee into a separate receiving tank by means of a conduit (a hot beverage extraction means), and cools this receiving tank by a refrigerating device. 
   Japanese Patent Application Laid-Open (Kokai) No. 2002-199987 discloses a water-discharge type coffee extraction device. In this extraction device, melt water that drips from an ice container is caused to drip into a filter that contains ground coffee, and coffee is extracted over a long period of time. 
   In the coffeemakers described in Japanese Patent Application Laid-Open (Kokai) No. 61-179115 and Japanese Utility Model Application Laid-Open (Kokai) No. 59-7732, high-temperature liquid coffee is cooled when it comes into direct contact with ice. In other words, the cooled liquid coffee is diluted by the water that is melted from the ice. Accordingly, the flavor of the iced coffee deteriorates, and the problem is that the taste and smell of the ice is transferred to the liquid coffee. 
   The structure of the coffee cooling device in Japanese Patent Application Laid-Open (Kokai) No. 2000-184966 is unclear; however, if in this structure the liquid coffee is poured into ice that is placed in the coffee cooling device beforehand, then the coffee will be diluted by the melt water from the ice. Thus, problems similar to those of Japanese Patent Application Laid-Open (Kokai) No. 61-179115 and Japanese Utility Model Application Laid-Open (Kokai) No. 59-7732 arise. 
   The coffeemaker described in Japanese Patent Application Laid-Open (Kokai) No. 2000-184966 contains a refrigerating device, and thus it requires a compressor, etc. As a result, the coffeemaker is complex in structure and large in size; and it is considered that this coffeemaker is for commercial use and is not suitable for general household use. 
   The device described in Japanese Patent Application Laid-Open (Kokai) No. 2002-199987 extracts coffee using ice water. The extraction time is conspicuously longer than in the case in which liquid coffee is cooled after being extracted with hot water, and the taste is also completely different. 
   SUMMARY OF THE INVENTION 
   The present invention was devised in light of such facts; the object of the present invention is to provide a coffeemaker suitable for home use, in which delicious iced coffee that is rich in flavor can be prepared easily without being diluted by melt water from ice, and which further has a simple structure and small in size. 
   The above object is accomplished by a unique structure for a coffeemaker that heats water accommodated in a water tank, conducts heated water into a coffee funnel that accommodates ground coffee, and collects liquid coffee that drips from the coffee funnel; and in the present invention, the coffeemaker comprises:
         an iced coffee tank that collects liquid coffee dripping from the coffee funnel,   an ice water tank that accommodates ice water which cools the liquid coffee inside the iced coffee tank via walls of the iced coffee tank, and   a driving means that provides a relative difference in rotational speed between the iced coffee tank and the ice water inside the ice water tank.       

   In the above structure, the high-temperature liquid coffee that drips from the coffee funnel enters the iced coffee tank. The liquid coffee inside this iced coffee tank is cooled by the ice water inside the ice water tank via the walls of the iced coffee tank. In other words, the iced coffee tank is inside ice water. Here, at least one of the tanks, i.e., either the iced coffee tank or the ice water tank, is rotated so that a relative difference in rotational speed is created between the two tanks, so that the liquid coffee inside the iced coffee tank is cooled with good efficiency via the walls of the iced coffee tank. 
   Thus, since the liquid coffee and ice water are separately accommodated with the walls of the iced coffee tank interposed between the two liquids, the liquid coffee is not diluted by melt water from the ice; and no deterioration in the flavor of the iced coffee occurs, and iced coffee with a good taste can be prepared in a simple manner. Furthermore, since cooling is accomplished by means of ice using a coffee funnel of the conventional drip type or paper filter type, etc., there is no need for a refrigerating apparatus, etc. Accordingly, the structure of the coffeemaker is simple, its size is small, and the coffeemaker is suitable for home use. 
   In the present invention, one of two tanks, i.e., either the iced coffee tank or the ice water tank, is anchored to the coffee funnel or main body side, while the other tank can be driven by a motor. For instance, such a structure can be employed that the iced coffee tank is provided in its entirety within the ice water tank, these tanks are rotated relatively and coaxially, and a liquid coffee discharge valve is provided in the lower end of the iced coffee tank. The iced coffee tank can be immersed in the ice water tank from above, so that it is inserted into and taken out of the ice water tank at its upper end. 
   Three accommodating sections, i.e., upper, middle and lower accommodating sections, are disposed in the main body of the coffeemaker, and the coffee funnel is placed or set in the upper and middle accommodating sections. This structure allows extraction of iced coffee and hot coffee to be easily handled. 
   For instance, when iced coffee is to be extracted, the coffee funnel is set in the upper accommodating section, and a coffee cooling device in which an iced coffee tank and an ice water tank are formed as an integral unit is set in the middle accommodating section; and after the extraction of the iced coffee, a jug is set in the lower accommodating section and the discharge valve of the iced coffee tank is opened, so that the iced coffee in the iced coffee tank flows downward into the jug. In this case, the operation can be simplified by a system in which the discharge valve opens in linkage with the operation of inserting the jug into the lower accommodating section. 
   When hot coffee is to be extracted, the coffee funnel is set in the middle accommodating section, a jug is set in the lower accommodating section, a scatter is set in the upper accommodating section, and the heated or hot water that is poured into the coffee funnel is dispersed and caused to drip into the coffee funnel. In this case, since hot water is poured into the coffee funnel while being scattered, hot water is not concentrated in one portion of the ground coffee. 
   Two water tanks, i.e., a larger water tank (or a first water tank) and a smaller water tank (or a second tank), in which the smaller water tank has substantially the same volume as the iced coffee tank, can be employed so that the smaller water tank is used for the extraction of iced coffee. With the use of such a smaller water tank, the iced coffee will not overflow from the iced coffee tank during extraction. 
   When such two types of water tanks, i.e., a larger water tank and a smaller water tank, are provided, it is preferable that the water pipe that is connected to the smaller water tank be smaller in diameter than the water pipe connected to the larger water tank. With this pipe having a smaller diameter, the flow velocity of the water is lowered, the extraction speed of the coffee is slowed, and it is possible to obtain a thicker coffee liquid. Thus, excessive dilution of the coffee can be prevented even if ice is placed in the coffee. 
   In cases where the present invention is applied to a coffeemaker in which the temperature is maintained by placing a jug of hot coffee on top of a heater installed in the coffeemaker, it is desirable to set an adiabatic material at the bottom of the jug during the extraction of iced coffee. Furthermore, it can be possible to form the pipe of the smaller water tank with a smaller diameter and to switch the amount of heat generated by the heater so that this amount of heat increases when hot coffee is extracted and decreases when iced coffee is extracted. 
   It is also possible to use a structure in which the driving means includes two driving bodies, which face the middle accommodating section and upper accommodating section, and a motor, which causes these rotating bodies to rotate, so that one driving main body rotates the ice water tank of the coffee cooling device that is placed in the middle accommodating section when iced coffee is extracted, and the other driving main body rotates the scatter that is placed in the upper accommodating section when hot coffee is extracted. The driving bodies can be constructed from gears, friction rings, etc. 
   Instead of causing the ice water tank or iced coffee tank to rotate, the driving means can rotate the ice water inside the ice water tank relative to the iced coffee tank. For example, the iced coffee tank and ice water tank can be formed in coaxial cylindrical shapes that have a bottom and held in the main body, while an agitating member (such as an agitating rod, agitating vanes, etc.) extending into the ice water tank from above is rotated by a motor. 
   The agitating member can be directly rotated by a motor or be fastened to some other rotating member. For example, the coffee funnel can be held so that this coffee funnel is rotated about the vertical axis, thus making it possible to rotate this coffee funnel by means of the motor, while the agitating member is fastened to the undersurface of the coffee funnel. 
   In the above structure, it becomes necessary to install and remove the coffee funnel and coffee cooling device with respect to the main body in a state in which the agitating member that is an integral unit with the coffee funnel is inserted in the ice water tank. Accordingly, the coffee funnel needs to be detachable and rotationally drivable with respect to the main body side. This can be made possible by a structure in which a funnel holding plate is installed in the main body above the coffee funnel so that the funnel holding plate is rotatable by the motor, and the coffee funnel is made detachable from beneath the funnel holding plate by inserting the coffee funnel beneath the funnel holding plate in a state in which the agitating member that is integral unit with the coffee funnel is inserted in the ice water tank and the coffee funnel is placed on the coffee cooling device and by lifting the coffee cooling device. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows, in cross section, the coffeemaker according to one embodiment of the present invention, the coffeemaker being in an iced coffee extraction process; 
       FIG. 2  shows, in cross section, the embodiment in a hot coffee extraction process; 
       FIG. 3  is an electrical circuit diagram employed in the embodiment; 
       FIG. 4  shows, in cross section, the coffeemaker according to another embodiment of the present invention; 
       FIG. 5  shows, in cross section, the coffeemaker according to still another embodiment of the present invention; and 
       FIG. 6  is a diagram that shows the manner of attaching the coffee funnel to the funnel holding plate in the embodiment shown in  FIG. 5 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   In  FIGS. 1 and 2 , the reference numeral  10  indicates a main body of the coffeemaker. The coffeemaker main body  10  includes a water tank accommodating section  12 , a bottom section  14 , an upper wall section  16 , and partition walls  18  and  20  that partition the space between the bottom section  14  and the upper wall section  16 . The partition walls  18  and  20  partition the space between the bottom section  14  and upper wall section  16  into three accommodating sections, i.e., upper, middle and lower accommodating sections  22 ,  24  and  26 . 
   Two types of water tanks  28  and  30  with different volumes, i.e., larger and smaller, are accommodated inside the water tank accommodating section  12 . A heater  32  is provided in the bottom section  14 , and water is selectively supplied to this heater  32  from either the larger (first) water tank  28  or the smaller (second) water tank  30 . Electromagnetic valves  38  and  40  are provided on pipes  34  and  36  that conduct water to the heater  32  from the water tanks  28  and  30 . The valves  38  and  40  can be selectively opened and closed by a switch  82  described below. One-way valves (not shown in the drawings) that prevent the back-flow of water into the tanks  28  and  30  are built in the electromagnetic valves  38  and  40 . 
   A motor  42  is installed on the water tank accommodating section  12  side in the vicinity of the middle accommodating section  24 . A speed reduction gear is provided in the motor  42 . An output shaft of the motor  42  extends into the upper accommodating section  22  and middle accommodating section  24 , and an upper or first gear  44  and a lower or second  46  that together constitute driving members are attached to both (upper and lower) extending ends of the output shaft. The motor  42  and gears  44  and  46  form a driving means. 
   Heated water (hot water) that is heated by the heater  32  is conducted to the upper wall section  16  through a pipe  48  and is caused to drip into the coffee funnel  50  ( FIG. 1 ) or scatter  52  ( FIG. 2 ) accommodated in the upper accommodating chamber  22 . The coffee funnel  50  performs coffee extraction by allowing the heated water to pass through the ground coffee accommodated in the coffee funnel  50 ; and for iced coffee extraction, the coffee funnel  50  is placed or set on the upper partition wall  18 . 
   A valve  54  that functions as a dripping stopper is provided in the bottom of the coffee funnel  50 . Ordinarily, the valve  54  is closed by the weight of the valve  54  itself or by a coil spring (not shown in the drawings), so that undesired dripping of the liquid coffee is prevented; and the valve  54  is opened in linkage with the placement or setting of a coffee cooling device  58  (described below) in the middle accommodating section  24 , so that the extracted liquid coffee is discharged into an iced coffee tank  60  described below. 
   As shown in  FIG. 2 , the scatter  52  is set in the upper accommodating section  22  during hot coffee extraction and disperses the heated or hot water that is poured into the coffee funnel  50  that is set in the middle accommodating section  24 . A circumferential gear  56  that engages with the gear  44  is formed on the outer circumference of the scatter  52 , and the scatter  52  is rotationally driven by the motor  42 . 
   During the extraction of iced coffee, the coffee cooling device  58  is placed in the middle accommodating section  24 . The coffee cooling device  58  comprises an iced coffee tank  60  and an ice water tank  62  that surrounds the outer circumference of the iced coffee tank  60 . The iced coffee tank  60  is provided inside the ice water tank  62 , and the bottom of the iced coffee tank  60  passes through the partition wall  20  and faces the lower accommodating section  26 . The bottom of the iced coffee tank  60  engages with this partition wall  20 , so that rotation is restrained. The ice water inside the ice water tank  62  directly contacts the outer surface of the iced coffee tank  60  and thus efficiently cools the iced coffee tank  60 . 
   A waterproof sealing member  64  is interposed between the outer surface of the iced coffee tank  60  and the sliding part of the ice water tank  62 , and the leakage of ice water is thus prevented. The ice water tank  62  can be rotated on a tray  66  that is placed on the partition wall  20 . A circumferential gear  68  that engages with the gear  46  is formed on the outer circumference of the ice water tank  62 , and the ice water tank  62  is rotationally driven by the motor  42 . 
   A discharge value  70  that constitutes a dripping stopper is provided in the bottom of the iced coffee tank  60 . Ordinarily, the discharge valve  70  is closed by the weight of the discharge valve  70  itself or by a coil spring (not shown in the drawings), so that undesired dripping of the liquid coffee that has accumulated inside the iced coffee tank  60  is prevented; and this valve  70  opens in linkage with the placement of a jug  72  in the lower accommodating section  26 . 
   The jug  72  is a vessel in which the liquid coffee is accumulated; and it has a handle and a pouring spout (neither of which is shown in the drawings) as well as a cover  74 . A projection, which pushes open the discharge valve  70  of the iced coffee tank  60 , and an opening that surrounds this projection, are formed in the cover  74 . The projection of the cover  74  pushes the valve  70  upward (and thus opens the valve  70 ) when the jug  72  is placed in the lower accommodating section  26 . As a result, the iced coffee that has accumulated inside the iced coffee tank  60  and that has been chilled by the ice water tank  62  flows downward into the jug  72 . 
   During this iced coffee extraction, the electromagnetic valve  40  opens so that water in the smaller water tank  30  flows into the heater  32 . Since the pipe  36  of the smaller water tank  30  has a small diameter, the quantity of heated water that drips into the coffee funnel  50  is small. Accordingly, the time required for the extraction of the coffee by the coffee funnel  50  is long, and the coffee that accumulates in the iced coffee tank  60  becomes thicker. Since iced coffee is generally drunk with ice put in the cup, the ice melts so that the coffee is diluted. In the shown embodiment, since the coffee that accumulates in the iced coffee tank  60  is sufficiently thick, no excessive dilution of the coffee would occur when the coffee is drunk with ice put therein. Accordingly, coffee can keep good taste to the end. 
   It is preferable to provide an adiabatic plate  76  between the bottom of the jug  72  and the heater  32 . The adiabatic plate  76  is used in order to prevent the iced coffee from being heated by the heat of the heater  32  when the iced coffee is collected in the jug  72 . When extracting hot coffee, as will be described below, it is naturally desirable to maintain the temperature of the hot coffee high by the heat of the heater  32 . Accordingly, the adiabatic plate  76  is removed, or it is replaced with a plate that has a good thermal conductivity. 
   Since the coffee cooling device  58  cools the iced coffee  60  by the relative movement of the iced coffee tank  60  and the ice water tank  62 , it is desirable to promote the agitation of the ice water inside the ice water tank  62 . Thus, projections or grooves, for instance may be formed in the outer surface of the iced coffee tank  60 . It is desirable that the iced coffee tank  60  be constructed from a material that has a good thermal conductivity, e.g., a metal. 
   Next, hot coffee extraction will be described with reference to  FIG. 2 . 
   When hot coffee is extracted, as described above, the scatter  52  is set in the upper accommodating section  22 , and the coffee funnel  50  is set in the middle accommodating section  24 . The discharge valve  54  of the coffee funnel  50  is pushed upward and opened by the cover  74  of the jug  72  set in the lower accommodating section  26 . The outer circumferential gear  56  of the scatter  52  is engaged with the driving gear  44  so that the scatter  52  is rotated by the motor  42  as described above. 
   During the hot coffee extraction, the electromagnetic valve  38  is opened, water from the larger water tank  28  is heated by the heater  32 , and this heated or hot water is supplied or conducted to the scatter  52 . Since the scatter  52  is rotating, heated water is uniformly scattered on the coffee funnel  50  from small holes in the bottom of the scatter  52 . Accordingly, good-tasting hot coffee can be extracted. 
   Next, the electrical circuitry of the above-described coffeemaker will be described with reference to  FIG. 3 . 
   In  FIG. 3 , the reference numeral  78  indicates a power supply. The power supply rectifies and smoothes a commercial power supply so as to supply a direct current with a constant voltage. The reference numeral  80  is a main switch; and when this main switch  80  is turned on, the heater  32  generates heat, and the motor  42  is started. The reference numeral  82  is a change-over switch; and with the use of this switch  82 , the positions of HOT and ICE are selected for the extraction of hot coffee and iced coffee, respectively. When HOT is selected, the electromagnetic valve  38  is opened, and water from the larger water tank  28  is used. When ICE is selected, the electromagnetic valve  40  is opened, and water from the smaller water tank  30  is used. 
     FIG. 4  shows another embodiment of the present invention. In the coffeemaker of this embodiment, the ice water tank  62 A of the coffee cooling device  58 A is formed in a cylindrical shape that has a bottom and is carried on the lower partition wall  20 A so as to be rotatable; and the upper part of the iced coffee tank  60 A is held by the main body  10 A side while being immersed in the ice water tank  62 A from above. 
   The ice water tank  62 A has a circumferential gear  68 A on its outer surface; and this gear, engaged with the driving gear  46 , is rotationally driven. The iced coffee tank  60 A is fastened to and suspended from the undersurface of the upper partition wall  18 A. In this embodiment, the structure of the cooling device  58 A is simplified. In  FIG. 4 , element that are the same as those in  FIGS. 1 and 2  are indicated by the same reference numerals, and a description of such elements is not described. 
     FIG. 5  shows still another embodiment of the coffeemaker of the present invention, and  FIG. 6  shows the manner of setting the coffee funnel in this embodiment. In  FIG. 5 , the reference numeral  100  indicates a main body,  102  is a water tank accommodating section,  104  a bottom section,  106  an upper wall section, and  108  a partition wall that partitions the space between the bottom section  104  and upper wall section  106  into upper and lower sections. 
   A water tank  112  is accommodated in the water tank accommodating section  102 . Scales that indicate the amount of water for iced coffee extraction and the amount of water for hot coffee extraction are separately provide on this water tank  112 . The water in the water tank  112  is supplied via a one-way valve (not shown in the drawings) to a heater  114  installed in the bottom section  104 . 
   The reference numeral  116  is a motor that has therein a speed reduction gear. The rotation of the output shaft of this motor is transmitted via a small pulley  118  and belt  120  to a large pulley  122  that is in the upper wall section  106 . This structure forms a part of the driving means described below. 
   The heated or hot water made by the heater  114  is conducted or supplied to the upper wall section  106  by a pipe  124  and is caused to drip into a scatter  126  that is held on the undersurface of the upper wall section  106 . The scatter  126  has a substantially dish-form shape with numerous small holes and causes the heated water that leaves the pipe  124  to drip into the coffee funnel  132  (described below) while scattering the heated water. 
   The shaft of the large pulley  122  passes vertically through the center of the scatter  126 , and a funnel holding plate  128  is fastened to the lower end of this shaft. The funnel holding plate  128  has a cylindrical shape, in which the portion near the center sinks slightly downward, and the circumferential edge opens outward at the bottom. Portions near the center and the circumferential edge portion are connected by radial ribs. Furthermore, a plurality of protrusions  130  are formed on the inner circumferential surface of the circumferential edge portion of the funnel holding plate  128  at appropriate intervals in the circumferential direction. The coffee funnel  132  is anchored to and released from these protrusions  130 . 
   The outer-circumferential diameter of the upper opening of the coffee funnel  132  is slightly smaller than the inner-circumferential diameter of the circumferential edge portion of the funnel holding plate  128 . A plurality of cut-outs  134  are formed in this outer circumference at appropriate intervals in the circumferential direction so that the protrusions  130  of the funnel holding plate  128  pass through the cut-outs  134 . 
   Accordingly, the funnel  132  can be inserted into the circumferential edge portion of the funnel holding plate  128  by positioning the cut-outs  134  in the outer circumference of the opening so that these cut-outs do not coincide with the protrusions  130  on the inside surface of the circumferential edge portion of the funnel holding plate  128 . When the coffee funnel  132  is rotated by an appropriate angle in the circumferential direction in this state, the outer circumferential edge of the coffee funnel  132  is anchored on the protrusions  130  of the funnel holding plate  128 . A plurality of agitating rods  136  are formed on the undersurface of the coffee funnel  132 . 
   The reference numeral  138  indicates a coffee cooling device. In this coffee cooling device, an iced coffee tank  140  set inside and an ice water tank  142  set outside are integrated in a coaxial configuration. In other words, the tanks  140  and  142  have the form of coaxial cylinders that have a bottom. A coffee discharge valve  144  is provided in the center of the bottom of the coffee cooling device  138 . 
   The coffee cooling device  138  is carried on a partition wall  108 . A slit  146  is formed in the partition wall  108  so that the discharge valve  144  passes through the slit  146 , and the coffee cooling device  138  is set on the partition wall  108  with the discharge valve  144  passing through the slit  146 . In this structure, as seen from  FIG. 6 , the coffee funnel  132  is placed on the coffee cooling device  138  so that the agitating rods  136  are inside the ice water tank  142 , and the coffee cooling device  138  and the coffee funnel  132  are mounted on the partition wall  108  in a combined state. 
   Next, the outer circumferential edge of the coffee funnel  132  is engaged with the protrusions  130  of the funnel holding plate  128  by adjusting the rotational angle of the coffee funnel  132  while pushing the coffee cooling device  138  upward as shown by the arrow in  FIG. 6 , so that the coffee funnel  132  is attached to the funnel holding plate  128 . If the coffee cooling device  138  is lowered in this state, the coffee funnel  132  is separated from the coffee cooling device  138 , so that the coffee cooling device  138  alone is lowered and placed on the partition wall  108 . In other words, the state shown in  FIG. 5  is obtained. 
   In  FIGS. 5 and 6 , the reference numeral  148  is a jug; and this jug  148  is carried on the heater  114  with an adiabatic plate  150  interposed during iced coffee extraction. During hot coffee extraction, the adiabatic plate  150  is removed, so that the temperature of the jug  148  is maintained by the heater  114 . The jug  148  during hot coffee extraction is lowered as shown by imaginary line in  FIG. 5 . 
   Numerous small holes are formed in the cover  152  of the jug  148  near the center of the cover  152 . The central portion of this cover  152  curves smoothly in a sinking (protruding) configuration, so that the cover  152  can be mounted even when turned inside out. During the extraction of iced coffee, the cover  152  is provided so that the center of the cover sinks as shown by the solid line in  FIG. 5 , and the discharge valve  144  of the coffee cooling device  138  is closed without contacting the cover  152 . When the jug  148  is lifted in this state, the recessed portion of the cover  152  pushes the discharge valve  144  upward and opens this valve. As a result, the iced coffee inside the iced coffee tank  140  can flow downward into the jug  148 . 
   During the extraction of hot coffee, on the other hand, the he jug  148  is lowered, and the cover  152  is turned inside out as indicated by the imaginary line in  FIG. 5 . As a result, the central portion of the cover  152  protrudes upward and pushes the discharge valve  144  upward so that the valve is opened. Accordingly, in this case, hot coffee flows directly downward into the jug  148  from the iced coffee tank  140 . It goes without saying that no ice water is placed in the ice water tank  142  during this hot coffee extraction. 
   In this embodiment, while ice water is placed in the ice water tank  142  during the extraction of iced coffee, the ice water is rotated by the driving means formed by the motor  116 , pulleys  118  and  122 , belt  120 , funnel holding plate  128 , coffee funnel  132  and agitating rods  136 , etc. Accordingly, the iced coffee tank  140  that is immersed in the ice water can efficiently cool the coffee that is in the iced coffee tank  140 . 
   When the jug  148  is set in the bottom section  104 , the cover  152  automatically opens the discharge valve  144 , so that the coffee that has collected and cooled in the iced coffee tank  140  flows downward into the jug  148 . 
   During hot coffee extraction, no ice water is placed in the ice water tank  142 ; and the cover  152  of the jug  148  is turned inside out, and the jug  148  is set in the bottom section  104  with the adiabatic plate  150  removed. When the jug  148  is thus set, since the cover  152  opens the discharge valve  144 , hot coffee that has dropped into the iced coffee tank  140  from the coffee funnel  132  passes straight through the iced coffee tank  140  and flows downward into the jug  148 . 
   When the extraction of coffee is completed, the cooling device  138  is lifted and rotated slightly together with the coffee funnel  132 , the coffee funnel  132  is removed from the funnel holding plate  128 , and the cooling device  138  and coffee funnel  132  are pulled out together to the side of the main body.