Patent Publication Number: US-2005115845-A1

Title: Cap device for mixing different kinds of materials separately contained therein and in bottle

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates, in general, to caps for bottles which contain therein a variety of materials, such as drinks, liquid medicines or liquid chemicals. More particularly, the present invention relates to a cap device for such bottles, which is capable of mixing an additive contained within the cap device with a bottled material to prepare a mixture according to a simple rotating action of the cap device relative to a bottle, thus allowing a user to easily prepare the mixture just before drinking or using the mixture.  
      2. Description of the Related Art  
      In the related art, most of conventional disposable bottles circulated and sold in markets each contain therein only a single kind of material, such as a drink, a liquid medicine or a liquid chemical, and are closed by caps at mouths thereof. When a user wants to add an additive to the material contained in such a capped bottle so as to prepare a mixture prior to drinking or using the mixture, the user must add the additive from a separate container to the bottled material after removing a cap from the bottle. Therefore, it is necessary for manufacturers of the additives and the bottled materials to contain such additives and materials in separate containers and bottles prior to marketing them, thus undesirably wasting natural resources due to the production of the separate containers and capped bottles. In addition, the adding of the additive from the separate container to the bottled material to mix them after removing the cap from the bottle is inconvenient to the user in that the user is forced to separately purchase and handle the additive container and the bottle.  
      Furthermore, it is extremely difficult for the user to add a precise amount of the additive from the separate container to the material contained in the bottle, and thus, the user roughly measures the amount of the additive to be added to the bottled material. Therefore, in the case of mixing of an additive with a bottled drink to produce a mixed beverage, the rough measurement of the amount of the additive may result in change in taste and quality of the mixed beverage. In the case of mixing of an additive with a bottled liquid medicine or a bottled liquid chemical to produce a mixed medicine or a mixed chemical, the rough measurement of the amount of the additive may result in incomplete dissolution of effective ingredients of the additive in the medicine or the chemical and a failure of accomplishment of desired medical or chemical effects of the mixed medicine or the mixed chemical.  
      Of course, when mixtures are prepared by manufacturers at factories and are marketed in a bottled state, in place of allowing users to mix additives with bottled materials to prepare mixtures just before drinking or using the mixtures, it is possible to avoid the above-described problems experienced in the mixing of the additives with the bottled materials performed by the users. However, the mixtures which are prepared by the manufacturers and marketed in the bottled state are problematic in that the effects of ingredients of the bottled mixtures may be gradually degraded as time goes by, in addition to change in colors of the mixtures. Furthermore, the bottled mixtures may generate floating matters and deposit therein with passage of time.  
      In an effort to overcome the above-described problems, the inventor of the present invention proposed a cap device for bottles, which is capable of mixing an additive contained therein with a material contained in a bottle to prepare a mixture, in Korean Patent Application No. 10-2002-31470. In the above cap device disclosed in Korean Patent Application No. 10-2002-31470, a plurality of radial ribs are provided at a valve means, and are supported at outside ends thereof on an inner surface of a neck of the bottle. However, since the outside ends of the above radial ribs are formed as free ends, the radial ribs may be easily bent or deformed. Therefore, the valve means may be easily displaced in the neck of the bottle.  
      Furthermore, it is necessary to separately store the additive in the cap device and the material in the bottle so that the additive is not undesirably added to the bottled material. Therefore, a sealing means for allowing the additive and the material to be separately stored in the cap device and the bottle is required.  
      That is, it is necessary to accomplish an airtight or watertight sealing effect at a junction between a part of the cap device containing the additive therein and another part of the cap device which communicates with the bottle containing the material therein, thus preventing an undesired premature mixing of the additive with the bottled material and thereby preventing any physical or chemical change in the additive and the bottled material due to the undesired premature mixing of them. When the airtight or watertight sealing effect at the above junction is accomplished, the operational effect of the cap device is enhanced.  
     SUMMARY OF THE INVENTION  
      Accordingly, the present invention has been made keeping in mind the above problems occurring in the related art, for example, Korean Patent Application No. 10-2002-31470, and it is an aspect of the present invention to provide a cap device for bottles, which is capable of mixing an additive contained therein with a bottled material to prepare a mixture according to a simple rotating action of the cap device relative to a bottle, performed by a user, thereby allowing the user to easily prepare the mixture just before drinking or using the mixture.  
      It is another aspect of the present invention to provide a cap device for bottles, in which a valve means is stably placed at a desired position in a neck of the bottle, without being undesirably displaced.  
      It is a further aspect of the present invention to provide a cap device for bottles, which allows the additive and the material to be separately stored in the cap device and the bottle, respectively, such that the additive is prevented from being prematurely added to the bottled material.  
      It is still another aspect of the present invention to provide a cap device for bottles, which contains a semisolid additive therein, and allows a user to mix the semisolid additive with a bottled material to prepare a mixture by simply rotating the cap device relative to a bottle just before drinking or using the mixture.  
      Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.  
      The above and/or other aspects are achieved by providing a cap device for bottles having a cap body tightened to a mouth of a bottle through screw-type engagement with a funnel part integrally formed in the cap body to discharge an additive from the cap body into the bottle through a lower end thereof. The cap device has a cap cover provided on the cap body to cover an open upper end of the cap body while defining a space inside both the cap body and the cap cover to contain the additive in the space. The cap device further has a valve means for opening or closing the lower end of the funnel part of the cap body according to a rotating action of the cap body relative to the externally threaded mouth of the bottle, wherein the valve means comprises a valve member having: a conical valve part to be brought into close contact with or spaced apart from the lower end of the funnel part of the cap body, thereby closing or opening the lower end of the funnel part, respectively. In addition, a plurality of radial ribs extending outward from an external surface of the conical valve part in radial directions, and a ring is integrated with the outside ends of the radial ribs for attachment to an inner surface of a neck of the bottle. In the alternative, the conical valve part can have an upwardly protruding shank having an external threading on its side surface corresponding to internal threading formed on the inner surface of the lower end of the funnel part.  
      In an alternative embodiment, the objects of this invention can be achieved by providing a cap device for bottles, comprising: a cap body tightened to a mouth of a bottle through screw-type engagement, the cap body being opened at an upper end thereof, with a cylindrical space defined in the cap body and valve means provided in the cap body at a lower end of the cylindrical space; an additive container having a space to contain an additive therein, the additive container being received in the cylindrical space of the cap body, with a discharging port provided on a lower end of the additive container to come in close contact with the valve means of the cap body, and an upper end of the additive container being opened and projected upward from the open upper end of the cap body; a cap cover tightened to the open upper end of the cap body through screw-type engagement; and a means for locking the cap cover to the upper end of the additive container.  
      In another alternative embodiment, the objects of this invention can be achieved by providing a cap device for bottles, comprising: a cap body tightened to a mouth of a bottle through screw-type engagement, the cap body being opened at an upper end thereof, with a cylindrical space defined in the cap body and valve means provided in the cap body at a lower end of the cylindrical space; an additive container having a space to contain an additive therein, the additive container being received in the cylindrical space of the cap body, with a discharging opening provided on a lower end of the additive container to come in close contact with the valve means of the cap body, and an upper end of the additive container being opened and projected upward from the open upper end of the cap body; a control unit assembled with the open upper end of the cap body to rotate relative to the cap body, with an internal thead provided on an inner circumferential surface of the control unit to be tightened to an outer circumferential surface of the upper end of the additive container through screw-type engagement, so that the control unit controls a vertical movement of the additive container; and a cap cover tightened to an upper end of the control unit.  
      Also, in another embodiment, the objects of this invention can be achieved by providing a cap device for bottles, comprising: a cap body tightened to an open lower end of a bottle through screw-type engagement, the cap body being opened at a lower end thereof, with a cylindrical space defined in the cap body and valve means provided in the cap body at an upper end of the cylindrical space; an additive container having a space to contain an additive therein, the additive container being received in the cylindrical space of the cap body, with a discharging opening provided on an upper end of the additive container to come in close contact with the valve means of the cap body, and a lower end of the additive container being opened and projected downward from the open lower end of the cap body; and a control unit having a cup shape which is closed at a bottom thereof, the control unit being assembled with the open lower end of the cap body to rotate relative to the cap body, with an internal thread provided on an inner circumferential surface of the control unit to be tightened to an outer circumferential surface of the lower end of the additive container through screw-type engagement, so that the control unit controls a vertical movement of the additive container. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:  
       FIG. 1  is an exploded perspective view showing a construction of a cap device, according to a first embodiment of the present invention;  
       FIG. 2  is a perspective view of the cap device of  FIG. 1 , when the assembled cap device is tightened to a mouth of a bottle;  
       FIGS. 3   a  and  3   b  are sectional views showing an operation of the cap device of  FIG. 1 ;  
       FIG. 4   a  is a perspective view of a valve means of the cap device, according to a second embodiment of the present invention;  
       FIG. 4   b  is a sectional view showing an operation of the valve means of  FIG. 4   a , which is installed in the cap device tightened to a mouth of a bottle;  
       FIG. 5  is a perspective view of a cap device according to a third embodiment of the present invention, when the cap device is tightened to a mouth of a bottle;  
       FIG. 6  is a sectional view showing a construction of the cap device of  FIG. 5 ;  
       FIGS. 7   a ,  7   b  and  7   c  are sectional views showing an operation of the cap device of  FIG. 5 ;  
       FIG. 8  is an exploded perspective view of the cap device of  FIG. 5 ;  
       FIG. 9  is a sectional view of a cap device according to a fourth embodiment of the present invention, when the cap device is tightened to a mouth of a bottle;  
       FIG. 10  is a sectional view of a cap device according to a fifth embodiment of the present invention, when the cap device is tightened to a mouth of a bottle;  
       FIG. 11  is a sectional view of a cap device according to a sixth embodiment of the present invention, when the cap device is tightened to a mouth of a bottle; and  
       FIG. 12  is a sectional view of a cap device according to a seventh embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.  
     First Embodiment  
       FIGS. 1 through 3   b  are views of a cap device for bottles according to the first embodiment of the present invention. As shown in  FIGS. 1 through 3   b , the cap device according to the first embodiment of the present invention comprises a cap body  50 , and a cap cover  100  provided on the cap body  50  to define a space therein to contain an additive in the space. The cap device further has a valve means to allow the space defined by both the cap body  50  and the cap cover  100  to selectively communicate with an interior of a bottle  13 .  
      In a detailed description, the cap body  50  is tightened to an externally threaded mouth  12  of the bottle  13 , with a funnel part  52  integrally formed in the cap body  50  to discharge the additive into the bottle  13  through a lower end thereof.  
      The cap cover  100  is provided on the cap body  50  to cover an open upper end of the cap body  50  while defining the space inside both the cap body  50  and the cap cover  100  to contain the additive in the space.  
      In the first embodiment of the present invention, the valve means comprises a valve member V having a conical valve part  14  acting as a valve seat to be brought into close contact with or spaced apart from the lower end of the funnel part  52  of the cap body  50 . The conical valve part  14  of the valve member V thus closes or opens the lower end of the funnel part  52  according to the rotating action of the cap body  50  relative to the externally threaded mouth  12  of the bottle  13 . A plurality of radial ribs  124  extend outward from an external surface of the conical valve part  14  in radial directions such that outside ends of the radial ribs  124  are supported on the inner surface of a neck of the bottle  13 . In order to allow the outside ends of the radial ribs  124  to be stably supported on the inner surface of the neck of the bottle  13 , a circular ring  24  having a predetermined thickness integrally surrounds the outside ends of the radial ribs  124 .  
      When the cap body  50  of the cap device having the above-described construction is rotated to move up relative to the externally threaded mouth  12  of the bottle  13 , the valve means separates from the lower end of the funnel part  52 , thus, opening the lower end of the funnel part  52  of the cap body  50 . Therefore, the space defined by the cap body  50  and the cap cover  100  of the cap device communicates with the interior of the bottle  13 , as shown in  FIGS. 3   a  and  3   b . The additive is thus discharged from the space defined by the cap body  50  and the cap cover  100  into the bottle  13  to be mixed with a material contained in the bottle  13  to produce a mixture.  
      In the cap device of  FIGS. 1, 2 ,  3   a  and  3   b , a vacuum pressure may act on the surface of the additive contained in the space of the cap device, when the cap cover  100  is completely closed. In such a case, the additive cannot smoothly flow from the space of the cap device into the bottle  13 , even when the space communicates with the interior of the bottle  13  by an operation of the valve means. In order to allow the additive to smoothly flow from the space into the bottle  13  in response to the communication of the space with the interior of the bottle  13 , a small vent hole provided with a valve cock C to open or close the vent hole is formed at a top surface of the cap cover  100 . When the valve cock C opens the vent hole, atmospheric air is introduced into the space of the cap device through the vent hole, thereby preventing any vacuum pressure from acting on the surface of the additive in the space. The additive thus smoothly flows from the space of the cap device into the bottle  13 , so that the additive is easily added to the material in the bottle  13  to produce a desired mixture.  
     Second Embodiment  
       FIGS. 4   a  and  4   b  are views of a valve means of the cap device, according to the second embodiment of the present invention. As shown in  FIGS. 4   a  and  4   b , a sealing means is provided at a junction between the valve member V and the lower end of the funnel part  52  of the cap body  50 , thus accomplishing an airtight or watertight sealing effect at the junction.  
      The sealing means is provided at the conical valve part  14  of the valve member V. That is, the sealing means comprises a plugging shank  14 S of a conical valve body extending upward from a valve holder  14 T of the valve part  14 . An external thread is formed around the plugging shank  14 S, such that the external thread of the plugging shank  14 S has the same pitch as an internal thread of the lower end of the funnel part  52  of the cap body  50 . In order to engage with the external thread of the plugging shank  14 S, the lower end of the funnel part  52  is provided with an engaging part  52 S on an internal surface thereof. Due to the sealing means, the desired sealing effect at the junction between the valve member V and the funnel part  52  is accomplished.  
      When the cap body  50  of the cap device is rotated to move up relative to the externally threaded mouth  12  of the bottle  13 , the lower end of the funnel part  52  is rotated to move in the same direction relative to the plugging shank  14 S. In such a case, the internal thread  52 S of the funnel part  52  moves upward along the external thread of the plugging shank  14 S to open the lower end of the funnel part  52 . Due to the screw-type engagement of the valve member V with the lower end of the funnel part  52 , it is possible to accomplish the airtight or watertight sealing effect at the junction between the valve member V and the lower end of the funnel part  52 .  
     Third Embodiment  
       FIGS. 5 through 8  are views of a cap device according to a third embodiment of the present invention. As shown in  FIGS. 5 through 8 , the cap device according to the third embodiment of the present invention includes a cap body  100 B, an additive container  50  and a cap cover  100 A. The cap body  100 B is tightened to an externally threaded mouth  10  of a bottle  13 , and defines a cylindrical space  103  inside the mouth  10  when the cap body  100 B is tightened to the mouth  10 . The additive container  50  is received in the cylindrical space  103  of the cap body  100 B and has a space  51  therein to contain an additive in the space  51 . The cap cover  100 A is tightened to an open upper end of the cap body  100 B to cover the open upper end of the cap body  100 B.  
      In a detailed description, the cap body  100 B has a double-walled structure at a lower portion thereof, as shown in  FIG. 6 . The double-walled structure of the cap body  100 B includes an outer sidewall  101  and an inner sidewall  102 . The outer sidewall  101  has an internal thread on an inner circumferential surface thereof for engagement to externally threading formed on the mouth  10  of the bottle  13 . The cylindrical space  103  is defined inside the inner sidewall  102  with a valve means  222  provided in the inner sidewall  102  of the cap body  100 B at a lower end of the cylindrical space  103 . As best seen in  FIG. 6 , the valve means  222  includes a plurality of radial ribs  222 - 1  which extend inward from the inner sidewall  102  of the cap body  100 B in radial directions at the lower end of the cylindrical space  103 . The valve means  222  further includes a circular valve part integrated with inside ends of the radial ribs  222 - 1 . The circular valve part has both an annular groove part  222 - 2  and a dome part  222 - 3 . The dome part  222 - 3  is provided on a central area of the valve part, while the annular groove part  222 - 2  is provided around the dome part  222 - 3 . The annular groove part  222 - 2  is inclined upward and outward on an outside surface thereof, thus providing a first inclined surface. In this embodiment, the radial ribs  222 - 1 , the annular groove part  222 - 2  and the dome part  222 - 3  are integrated with each other into a single structure. The circular valve part having the annular groove part  222 - 2  and the dome part  222 - 3  is brought into close contact with a flanged discharging port  52  of the container  50 , as will be described in detail later herein, thus executing a valve function. When the valve part of the cap body  100 B opens the flanged discharging port  52  of the container  50 , the additive flows from the space  51  of the container  50  into the bottle  13  through a plurality of spaces defined between the radial ribs  222 - 1 , thus being added to a bottled material to prepare a desired mixture.  
      The inner sidewall  102  of the cap body  100 B is inserted into the mouth  10  of the bottle  13  when the cap body  100 B is tightened to the mouth  10  of the bottle  13 . The cap body  100 B is also opened at the upper end thereof, thus having the open upper end  104 . That is, the open upper end  104  of the cap body  100 B is projected upward from the remaining part of the cap body  100 B, and has an external thread on the outer circumferential surface thereof, with a plurality of air paths  105  (see  FIG. 8 ) vertically provided on the externally threaded outer circumferential surface of the open upper end  104  of the cap body  100 B. The air paths  105  guide atmospheric air to a vent hole H of the additive container  50 , as will be described in detail later herein.  
      The additive container  50 , which is a cylindrical body, is opened at the upper and lower ends thereof, as shown in  FIG. 6 . The additive container  50  has the flanged discharging port  52  at a bottom wall thereof. The flanged discharging port  52 =is projected downward from the bottom wall of the container  50 , and is inclined upward and inward on a lower end surface thereof, thus providing a second inclined surface, as best seen in  FIG. 6 . Thus, the flanged discharging port  52  is able to be in close contact with the annular groove  222 - 2  of the valve means  222  of the cap body  100 B when the valve means  222  is closing the discharging port  52 . In the above state, the flanged discharging port  52  is in linear contact with the annular groove  222 - 2  of the valve means  222 , thus providing a higher contact pressure which prevents the additive from undesirably leaking from the container  50  into the bottle  13 . The additive container  50  defines the space  51  therein to contain the additive in the space  51 . The additive container  50  is also rounded along an inside corner of the bottom wall thereof, thus providing a rounded surface S on the inside corner of the bottom wall. Due to the rounded surface S, the additive is smoothly discharged from the space  51  of the container  50  into the bottle  13  through the flanged discharging port  52  in response to an operation of the valve means  222  to open the flanged discharging port  52 .  
      The cap device of the third embodiment further includes a means for locking the cap cover  100 A to the upper end of the additive container  50  while allowing the container  50  to move vertically, in conjunction with a rotation of the cap cover  100 A. The locking means includes an outside locking part  53  that is provided around the outer circumferential surface of the upper end of the additive container  50 . The locking means further includes an inside locking part  111  that is provided around the inner circumferential surface of the cap cover  100 A to engage with the outside locking part  53  of the container  50 . Thus, the additive container  50  is locked to the cap cover  100 A by engagement of the outside locking part  53  with the inside locking part  111 , so that the cap cover  100 A is removed from the container  50  when the cap cover  100 A is rotated with an external rotating force which is stronger than a predetermined reference force. In other words, when the cap cover  100 A is rotated with an appropriate rotating force, the container  50  moves vertically in conjunction with the rotation of the cap cover  100 A.  
      The additive container  50  has the vent hole H at a predetermined position on the upper portion of a sidewall thereof. When the cap cover  100 A is fully tightened to the upper end  104  of the cap body  100 B as shown in  FIG. 6 , the vent hole H of the container  50  is closed by the upper end  104  of the cap body  100 B. However, when the cap cover  100 A is loosened from the upper end  104  of the cap body  100 B as shown in  FIG. 7   a , the upper portion of the container  50  having the vent hole H moves upward so that the vent hole H is exposed above the upper end  104  of the cap body  100 B. In the above state, atmospheric air is guided into the container  50  via the air paths  105  (see  FIG. 8 ) of the cap body  100 B and the vent hole H of the container  50 .  
      The cap device of the third embodiment further includes a stop protrusion  54 . The stop protrusion  54  is an annular ring which is provided around the outer circumferential surface of the additive container  50  at an intermediate position. The stop protrusion  54  limits an upward movement of the additive container  50  within a predetermined range. That is, the stop protrusion  54  of the container  50  is stopped by the cap body  100 A during the upward movement of the container  50 , thus limiting the upward movement of the container  50  within the predetermined range. The provision of the stop protrusion  54  on the container  50  is to accomplish the following operational effect. That is, at a last stage of loosening the cap cover  100 A from the cap body  100 B, the stop protrusion  54  of the container  50  is stopped by the cap body  100 A. In the above state, when the cap cover  100 A is rotated with an external rotating force which is stronger than the predetermined reference force, the inside locking part  111  of the cap cover  100 A escapes from the outside locking part  53  of the container  50 , so that the cap cover  100 A can be completely removed from the cap body  100 B. In other words, the locking force to lock the inside locking part  111  of the cap cover  100 A to the outside locking part  53  of the container  50  allows the container  50  to move upward in the vertical direction by the rotation of the cap cover  100 A until the stop protrusion  54  of the container  50  is stopped by the cap body  100 A. However, once the stop protrusion  54  of the container  50  is stopped by the cap body  100 A, the locking force to lock the inside locking part  11  of the cap cover  100 A to the outside locking part  53  of the container  50  cannot remove the stop protrusion  54  from the cap body  100 B. Therefore, when the cap cover  100 A in the above state is further rotated with the external rotating force which is stronger than the predetermined reference force, the inside locking part  111  of the cap cover  100 A forcibly escapes from the outside locking part  53  of the container  50 . Thus, the cap cover  100 A can be completely removed from the cap body  100 B.  
      As shown in  FIGS. 5 and 6 , the cap cover  100 A is tightened to the open upper end  104  of the cap body  100 B through screw-type engagement. The cap cover  100 A has the inside locking part  111  on the inner circumferential surface thereof, as described above. The inside locking part  111  of the cap cover  100 A is locked to the outside locking part  53  of the container  50 . The inside locking part  111  and the outside locking part  53  constitute the locking means which locks the cap cover  100 A to the container  50 .  
      When the cap cover  100 A is fully tightened to the open upper end  104  of the cap body  100 B through the screw-type engagement, the cap cover  100 A closes and seals the open upper end  104  of the cap body  100 B.  
      The operation and effect of the cap device according to the third embodiment having the above-mentioned construction will be described herein below. After both a desired additive and compressed gas are injected into the space  51  of the container  50 , the cap cover  100 A is fully tightened to the open upper end  104  of the cap body  100 B through the screw-type engagement, thus sealing the space  51  of the container  50  which contains both the additive and the compressed gas therein. In the third embodiment of the present invention, an example of the additive to be contained in the container  50  can be powdered green tea or medical drugs in the form of granules or powders, while an example of the compressed gas to be injected into the container  50  can be nitrogen gas or air. The cap device with both the additive and the compressed gas contained in the sealed space  51  of the container  50 , is shown in  FIG. 6 .  
      To prepare a mixture by mixing the additive with a bottled material, the cap cover  100 A is rotated to slightly open the cap device, as shown in  FIG. 7   a . In the above state, the flanged discharging port  52  of the container  50  is slightly spaced apart from the annular groove  222 - 2  (see  FIG. 6 ) of the valve means  222  of the cap body  100 B. Thus, the additive is discharged from the space  51  of the container  50  into the bottle  13  through the plurality of spaces defined between the radial ribs  222 - 1  (see  FIG. 6 ) and added to the bottled material to prepare the desired mixture. While the additive is discharged from the space  51  of the container  50  into the bottle  13 , the compressed gas in the space  51  promotes the discharge of the additive.  
      When the slightly opened cap cover  100 A is further rotated to further open the cap device, as shown in  FIG. 7   b , the upper portion of the container  50  having the vent hole H moves upward so that the vent hole H is exposed above the upper end  104  of the cap body  100 B. Thus, the vent hole H communicates with the atmosphere through the air paths  105  (see  FIG. 8 ) which are provided on the outer circumferential surface of the upper end  104  of the cap body  100 B. Therefore, atmospheric air is guided into the space  51  of the container  50  through the air paths  105  and the vent hole H to allow the additive to be almost completely discharged from the space  51  into the bottle  13 , due to gravity.  
      When the cap cover  100 A in the state of  FIG. 7   b  is further rotated, the stop protrusion  54  that is provided on the outer circumferential surface of the additive container  50  at the intermediate position is stopped by the cap body  100 A, thus stopping the upward movement of the additive container  50 .  
      When the cap cover  100 A in the above state is further rotated by an external rotating force which is stronger than the predetermined reference force, the inside locking part  111  of the cap cover  100 A forcibly escapes from the outside locking part  53  of the container  50 . Thus, the cap cover  100 A is completely removed from the cap body  100 B.  
      After the additive from the container  50  is mixed with the material contained in the bottle  13  to prepare the desired mixture according to the above-mentioned operation of the cap device, a user can drink or use the mixture by discharging the mixture from the bottle  13  through the open upper end of the container  50 .  
      In the above state, the entire part of the cap device may be completely removed from the mouth  10  of the bottle  13 , as desired, by loosening the cap body  100 B from the mouth  10  of the bottle  13 .  
      Meanwhile, when the user desires to drink or use the bottled material without mixing the additive of the cap device with the bottled material, the cap device in the state of  FIG. 6  may be completely removed from the mouth  10  of the bottle  13  by loosening the cap body  100 B from the mouth  10  of the bottle  13 .  
     Fourth Embodiment  
       FIG. 9  is a sectional view of a cap device according to a fourth embodiment of the present invention, when the cap device is tightened to a mouth of a bottle. As shown in  FIG. 9 , the cap device according to the fourth embodiment of the present invention comprises a cap body  100 B, an additive container  50  and a cap cover  100 A. The cap body  100 B is tightened to an externally threaded mouth  10  of a bottle  13 , and defines a cylindrical space  103  inside the mouth  10  when the cap body  100 B is tightened to the mouth  10 . The additive container  50  is received in the cylindrical space  103  of the cap body  100 B and has a space  51  therein to contain an additive in the space  51 . The cap cover  100 A is tightened to an open upper end of the cap body  100 B to cover the open upper end of the cap body  100 B.  
      In a detailed description, the cap body  100 B has a double-walled structure at a lower portion thereof, in the same manner as that described for the third embodiment of the present invention. The double-walled structure of the cap body  100 B includes an outer sidewall  101  and an inner sidewall  102 . A valve means  222  is provided in the inner sidewall  102  of the cap body  100 B at a lower end of the cylindrical space  103 . Different from the valve means according to the third embodiment, the valve means  222  according to the fourth embodiment includes a plurality of vertical ribs  222 - 1  which extend downward from the cap body  100 B in vertical directions at the lower end of the cylindrical space  103  of the cap body  100 B. The valve means  222  further includes a circular valve part integrated with lower ends of the radial ribs  222 - 1 . The circular valve part has a dome part  222 - 3  which is provided on a central area of the valve part.  
      The general shape of the additive container  50  according to the fourth embodiment remains the same as that described for the third embodiment. However, the additive container  50  according to the fourth embodiment does not have any stop projection on the circumferential outer surface thereof, and the lower end of the container  50  has no bottom wall, but linearly extends downward, thus forming a wide discharging opening  52 , different from the third embodiment. The lower end surface of the discharging opening  52  of the container  50  is inclined upward and inward, thus providing an inclined surface. The discharging opening  52  of the container  50  is brought into close contact with the dome part  222 - 3  of the valve means  222  at the inclined surface thereof.  
      The operation and effect of the cap device according to the fourth embodiment having the above-mentioned construction will be described herein below.  
      The container  50  can contain therein a semisolid additive, such as ice cream, mustard sauce, thick soypaste mixed with red peppers or mayonnaise, while the bottle  13  can contain therein a desired material, such as a soda pop, a functional beverage, or soybean sauce. To mix the semisolid additive, for example, ice cream, with the bottled material, for example, soda pop, to prepare a mixture, the cap cover  100 A is rotated relative to the cap body  100 B. Thus, the container  50  moves upward in the vertical direction. Therefore, the ice cream is discharged from the space  51  of the container  50  into the bottle  13  through a plurality of wide spaces defined between the vertical ribs  222 - 1 , thus being added to the soda pop in the bottle  13  to prepare the desired mixture. When a user shakes the bottle  13  in the above state, it is possible to more easily and quickly mix the ice cream with the soda pop.  
     Fifth Embodiment  
       FIG. 10  is a sectional view of a cap device according to a fifth embodiment of the present invention, when the cap device is tightened to a mouth of a bottle. As shown in  FIG. 10 , the cap device according to the fifth embodiment comprises a cap body  100 B which is tightened to the mouth  10  of the bottle  13  through screw-type engagement. The cap body  100 B defines a cylindrical space  103  therein. The cap device further includes an additive container  50  having a space  51  to contain an additive therein. The additive container  50  is received in the cylindrical space  103  of the cap body  100 B. The cap device further includes a cylindrical control unit  100 C which is assembled with the open upper end of the cap body  100 B by an engaging ring  113  to rotate relative to the cap body  100 B, with an internal thread provided on an inner circumferential surface of the control unit  100 C to be tightened to an outer circumferential surface of the upper end of the additive container  50  through screw-type engagement. Thus, the control unit  100 C controls a vertical movement of the additive container  50 . The cap device further includes a cap cover  100 A which is tightened to the upper end of the control unit  100 C. In the cap device, an O-ring  112  is provided at a junction between the cap body  100 B and the control unit  100 C to accomplish a sealing effect at the junction. The engaging ring  113  extends upward from the upper end surface of the cap body  100 B, and is inserted into an annular groove which is formed along the lower end of the control unit  100 C. Thus, the cylindrical control unit  100 C rotates relative to the cap body  100 B. The cap device according to the fifth embodiment further includes a valve means  222  with the same construction as that of the fourth embodiment.  
      As shown in  FIG. 10 , the cylindrical control unit  100 C is tightened to the outer circumferential surface of the upper end of the additive container  50  through the screw-type engagement. Thus, the container  50  moves upward and downward in a vertical direction by a rotation of the control unit  100 C. In the same manner as that described for the fourth embodiment, the container  50  functions well for containing therein and discharging a semisolid additive, such as ice cream, mustard sauce, thick soypaste mixed with red peppers or mayonnaise, while the bottle  13  contains therein a desired material, such as a soda pop, a functional beverage, or soybean sauce.  
     Sixth Embodiment  
       FIG. 11  is a sectional view of a cap device according to a sixth embodiment of the present invention, when the cap device is tightened to a mouth of a bottle. As shown in  FIG. 11 , the cap device according to the sixth embodiment includes a cap body  100 B which is tightened to the mouth  10  of the bottle  13  through screw-type engagement. The cap body  100 B defines a cylindrical space  103  therein. The cap device further includes an additive container  50  having a space  51  to contain an additive therein. The additive container  50  is received in the cylindrical space  103  of the cap body  100 B. The cap device further includes a cylindrical control unit  100 C which is assembled with the open upper end of the cap body  100 B by an engaging ring  113  to rotate relative to the cap body  100 B. The engaging ring  113  extends upward from the upper end surface of the cap body  100 B. The cap device further includes a cap cover  100 A which is tightened to the upper end of the control unit  100 C.  
      The general construction of the cap device according to the sixth embodiment remains the same as that described for the fifth embodiment. However, both the inner sidewall of the cap body  100 B and the additive container  50  extend downward from a neck into an interior of the bottle  13  to a predetermined length. Furthermore, the cylindrical control unit  100 C extends upward to a length which corresponds to the length of the downward extensions of both the cap body  100 B and the additive container  50 . The cap cover  100 A is made of a plastic material, with a discharging hole  114  provided on the top wall of the cap cover  100 A. The discharging hole  114  of the cap cover  100 A may be provided with a cap (not shown).  
      Because both the cap body  100 B and the additive container  50  extend downward from the neck into the interior of the bottle  13  as described above, a user easily mixes the additive with the bottled material to prepare a desired mixture.  
      In the present invention, the bottle  13  may be made of a soft plastic material which allows the user to discharge the mixture from the bottle  13  to the outside through the discharging hole  114  by compressing the bottle  13 .  
     Seventh Embodiment  
       FIG. 12  is a sectional view of a cap device according to a seventh embodiment of the present invention, when the cap device is tightened to a mouth of a bottle. As shown in  FIG. 12 , the cap device according to the seventh embodiment includes a cap body  100 B which is tightened to an open lower end  10  of the bottle  13  through screw-type engagement. The cap body  100 B is opened at a lower end thereof, with a cylindrical space  103  defined in the cap body  100 B and a valve means  222  provided in the cap body  100 B at an upper end of the cylindrical space  103 . The cap device further includes an additive container  50  which has a space  51  to contain an additive therein. The additive container  50  is received in the cylindrical space  103  of the cap body  10 B, with a discharging opening  52  provided on an upper end of the additive container  50  to come in close contact with the valve means  222  of the cap body  100 B. A lower end of the additive container  50  is opened and projected downward from the open lower end of the cap body  100 B. The cap device further includes a cylindrical control unit  100 C. The cylindrical control unit  100 C is assembled with the open lower end of the cap body  100 B by an engaging ring  113  to rotate relative to the cap body  100 B, with an internal thread provided on an inner circumferential surface of the control unit  100 C to be tightened to an outer circumferential surface of the lower end of the additive container  50  through screw-type engagement. The control unit  100 C thus controls a vertical movement of the additive container  50 .  
      The control unit  100 C has a cup shape with a closed bottom, thus serving as a cap cover.  
      Even though the cap device according to the seventh embodiment is provided at the lower end of the bottle  13 , different from the sixth embodiment in which the cap device is provided at the mouth of the bottle, the cap device according to the seventh embodiment provides the same operation and effect as those of the sixth embodiment.  
      Although embodiments of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.