Abstract:
A vacuum apparatus for easily forming a vacuum in any bottle, container or the like and for providing a stable sealing. A lower cylindrical member together with a disc member forms a space portion in which a vacuum or an atmospheric pressure is applied, and the lower portion of an upper cylindrical member is inserted in the space portion and divides the space portion into upper and lower spaces. With a downward movement of the upper cylindrical member, the upper space expands and draws air inside of a bottle, and with an upward movement thereof, the air introduced into the upper space is vented outside. At this time, a check valve is selectively opened and closed and is operated by a pressure difference applied thereon. By repetitive reciprocating movement of the upper cylindrical member, a high vacuum is formed in the bottle and is sealed by the check valve. The apparatus is adaptable in a vacuum bottle, a medical suction instrument or the like.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a vacuum apparatus, and more particularly to a vacuum apparatus for easily forming a high vacuum in a bottle or the like. 
     2. Description of the Prior Art 
     In general, the usage of vacuum bottles or containers are wide spread from medical applications to storing foods or chemical solutions, and its need are just as diverse. For example, coffee beans which are sensitive to a moisture is usually stored in the vacuum bottle to maintain its freshness. 
     Various apparatuses and methods for forming and maintaining a vacuum in a bottle have been proposed. FIGS. 1 to  4  show a sealing cap disclosed in a U.S. Pat. No. 4,703,865. Referring to FIGS. 1 to  4 , the sealing cap comprises a tubular body portion  10  with an encircling skirt  12  which grips a bottle or other like containers. Body portion  10  and skirt  12  are formed in one-piece from rubber or other elastomeric material. A through-bore  14  extending along the axial direction of body portion  10  receives a plug  30  of elastomeric material. Plug  30  is movable downward from the initial state shown in FIG.  1 . 
     As shown in FIG. 2, as plug  30  moves downward, the air in the bottle flow out through through-bore  14 , and as shown in FIG. 3, plug  30  moves to its final position so as to maintain the vacuum status in the bottle. 
     Through-bore  14  includes circular portions  15  and  16 , and a tapered portion  17 . In the initial state of FIG. 1, plug  30  is inserted into an annular groove  16  by a disk portion  33 , and the body portion thereof is press-fitted against tapered portion  17 . 
     Tapered portion  17  is formed at a lower portion thereof with a bore portion  18  having a cross-section as shown in FIG.  4 . When plug  30  moves inside of bore portion  18 , a clearance is formed between plug  30  and an inside wall of bore portion  18  so that the air in the bottle can flow outside through the cap. That is, bore portion  18  has a substantially triangular cross-section thereby forming the clearance with plug  30 . 
     Bore portion  18  is formed at a lower portion thereof with an annular groove  19  and finally with a taper portion  20 . When in the final state shown in FIG. 3, plug  30  is inserted into annular groove  19  by disk portion  33  and the body thereof is press-fitted against tapered portion  20 . 
     Through the above described operations, sequentially shown in FIGS. 1 to  3 , bottle  40  comes to be evacuated. 
     However, the sealing cap according to the conventional technique cannot achieve a high vacuum in the bottle because its one time operation which draws only a small amount of the air. In addition, the vertical movement of the plug is not efficient due to its structural inconvenience when manipulated by the user. 
     SUMMARY OF THE INVENTION 
     In view of the foregoing, it is an object of the present invention to provide a vacuum apparatus which forms a high vacuum in a predetermined space by repetitive push down operations and stably seals the vacuum state. 
     To achieve the object, a first embodiments of the present invention provides a vacuum apparatus comprising: a first means for forming a space portion in which a vacuum pressure or an ambient pressure is applied, the first means being assembled to a space member which encloses a predetermined space; a second means for forming vacuum or ambient state in the space portion, the second means being inserted a lower portion thereof into the first means and vertically reciprocating; a third means for connecting or closing a passage between the space member and the space portion responding to a movement of the second means; a fourth means for connecting or closing a passage between the space portion and ambient responding to the movement of the second means; and a fifth means for releasing a vacuum inside the space member. 
     The first means includes a lower cylindrical member with an upper portion thereof being opened and a first disc member assembled to the upper portion of the lower cylindrical member and defining an uppermost position of the second means, the lower cylindrical member being formed at a center thereof with a circular channel. The circular channel extends upward from a lower portion of the lower cylindrical member, at a core portion of which a first passage communicating with the space member and ambient, at a circumferential portion of which a second passage communicating with the space member and the space portion, and a first post extends downward from the first disc member and has a predetermined clearance against the second passage, and a circular recess is formed at an upper center portion of the first disc member. 
     The fifth means includes a second disc member inserted into the circular recess, a second post extending downward from the second disc member and having a predetermined clearance against the first passage, a first O-ring press-fitted between a lower end of the second post and the first passage, and a first compression spring positioned in the circular recess so as to upward urge the second disc member. 
     According to the feature of the first embodiment, the first passage diverges downward. 
     The second means includes an upper cylindrical member with an upper portion thereof being opened, the upper cylindrical member being inserted a lower portion thereof into the lower cylindrical member so as to divide the space portion into upper and lower spaces, the second passage being communicated with the upper space. The upper cylindrical member is formed at a lower wall thereof with an opening engaging with the circular channel, the opening being formed at a peripheral portion thereof with a first annular groove into which a second O-ring is inserted so as to block airflow between the upper and lower spaces. 
     The third means includes a flexible check valve having a dome-like portion at a center thereof, making contact with a lower end of the first post at the first disc member and selectively closing the second passage. The check valve being deformed upward at a circumferential portion thereof when a vacuum is formed in the upper space thereby opening the second passage, and being returned downward when ambient pressure is applied in the upper space thereby closing the second passage. 
     The first disc member is formed at a peripheral portion thereof with a second outward annular groove. The second annular groove is formed at an upper side location thereof with a third passage communicating with the ambient. 
     The fourth means includes a third O-ring inserted into the second annular groove, the third O-ring being smaller than the second annular groove in height, being slipped downward between an inner wall of the upper cylindrical member and a lower end of the second annular groove when the upper cylindrical member moves downward, thereby preventing an inflow of the ambient air into the upper space, and being slipped toward an upper end of the second annular groove when the upper cylindrical member moves upward, thereby connecting the upper space and the third passage. 
     According to a feature of the first embodiment, the upper cylindrical member is formed at a side wall thereof with a fourth passage communicating with the ambient so as to communicate the upper space with the ambient when the lower wall of the upper cylindrical member makes contact with the lower wall of the lower cylindrical member. 
     A second compression spring is located between an underside of the upper cylindrical member and an upper surface of the lower cylindrical member, thereby upward urging the upper cylindrical member. 
     The upper cylindrical member is formed at the upper surface thereof with a first step portion and the first disc member is formed at an underside thereof with a second step portion engaging with the first step portion. 
     The vacuum apparatus further comprises a cover mounted to the upper portion of the upper cylindrical member for facilitating a user the reciprocal movement of the upper cylindrical member. A filter is provided at a lower end portion of the circular channel of the lower cylindrical member. 
     According to a second embodiment of the present invention, there is provided a vacuum apparatus comprising: a first means for forming a predetermined space portion in which a vacuum or an ambient pressure is applied, the first means being assembled to a space member encircling a predetermined space; a second means for forming a vacuum or an ambient pressure in the space portion by a vertical reciprocal movement thereof, the second means being inserted a lower portion thereof into the first means; a third means for communicating/closing the space member with/from the space portion responding to the reciprocal movement of the upper cylindrical member; and a fourth means for communicating/closing the space portion with/from the ambient responding to the reciprocal movement of the upper cylindrical member. 
     The first means includes a lower cylindrical member with an upper portion thereof being opened and at a center portion thereof being formed with a stepped circular channel, and a first disc member coupled to the upper portion of the lower cylindrical member so as to define an uppermost position of the second means. 
     The third means includes a dome-like valve support member inserted into an upper portion of the circular channel and formed at a center thereof with a first passage for communicating the circular channel with the space portion, a disc-like check valve pivotally placed on the valve support member, an operating member having a leg which pushes a side portion of the check valve thereby pivoting the same, and a flexible second disc member for mounting the operating member to the first disc member such that the operating member is vertically movable. 
     The second means includes an upper cylindrical member with an upper portion thereof being opened, the upper cylindrical member being inserted the lower portion thereof into the lower cylindrical member thereby dividing the space portion into upper and lower spaces, the circular channel communicating with the upper space. 
     The upper cylindrical member is formed at an underside thereof with an opening inserted around the circular channel. The opening is formed at a peripheral portion thereof with a first annular groove inward opened. A second O-ring for blocking an airflow between the upper and lower spaces is inserted into the first annular groove. 
     The first disc member is formed at a peripheral portion thereof with a second annular groove outward opened, the second annular groove being formed at an upper end thereof with a third passage communicating the upper space with the ambient. 
     The fourth means includes a third O-ring inserted into the second annular groove and being smaller than the second annular groove in height, the third O-ring being slipped downward between an inner wall of the upper cylindrical member and a lower end of the second annular groove when the upper cylindrical member moves downward, thereby preventing an inflow of the ambient air into the upper space, and being slipped to an upper end of the second annular groove when the upper cylindrical member moves upward, thereby connecting the upper space and the third passage. 
     According to a feature of the second embodiment, the upper cylindrical member is formed at a side wall thereof with a fourth passage communicating with the ambient so as to communicate the upper space with the ambient when an underside of the upper cylindrical member makes contact with the lower wall of the lower cylindrical member. 
     When the upper cylindrical member moves downward, the second disc member is underlaid at an upper surface thereof with an ambient pressure and at an underside thereof with a vacuum, thereby being deformed downward so that the leg of the operating member pushes a side portion of the check valve so as to pivot the same and an airflow is generated through the first passage from the space member to the upper space, and sequentially when the upper cylindrical member moves lowermost position such that the lower wall of the upper cylindrical member makes contact with the lower wall of the lower cylindrical member, the fourth passage is opened thereby communicating the upper space with the ambient and applying an ambient pressure to the underside of the second disc member so that the second disc member returns upward and the check valve closes the first passage. 
     A second compression spring is located between an underside of the upper cylindrical member and an upper surface of the lower cylindrical member, thereby upward urging the upper cylindrical member. 
     The upper cylindrical member is formed at the upper surface thereof with a first step portion and the first disc member is formed at an underside thereof with a second step portion engaging with the first step portion. 
     The vacuum apparatus further comprises a cover mounted to the upper portion of the upper cylindrical member for facilitating for a user the reciprocal movement of the upper cylindrical member. 
     A filter is provided at a lower end portion of the circular channel of the lower cylindrical member. 
     As described above, the first and the second embodiments achieves that a high vacuum is easily formed inside of the space member such as a bottle, a medical evacuation instrument or the like and is maintained stably. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above object and other advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which: 
     FIGS. 1 to  4  are sectional views showing a conventional sealing cap. 
     FIG. 5 is a perspective view of a vacuum bottle adapted with a vacuum apparatus in accordance with the present invention. 
     FIG. 6 is an exploded perspective view of a vacuum apparatus in accordance with a first preferred embodiment of the present invention. 
     FIG. 7 is a partial sectional view of the vacuum bottle in which a vacuum is formed by the vacuum apparatus. 
     FIG. 8 is a partial sectional view of the vacuum bottle wherein an upper cylindrical member is moving upward. 
     FIG. 9 is a partial sectional view of the vacuum bottle wherein the upper cylindrical member has reached to its uppermost position. 
     FIG. 10 is a partial sectional view of the vacuum bottle wherein the upper cylindrical member is moving downward. 
     FIG. 11 is a partial sectional view of the vacuum bottle wherein the upper cylindrical member has reached to its lowermost position. 
     FIG. 12 is a partial sectional view which illustrates the release of vacuum in the bottle in accordance with the first preferred embodiment of the present invention. 
     FIG. 13 is a partial sectional view wherein a vacuum is formed in a bottle by a vacuum apparatus in accordance with a second preferred embodiment of the present invention. 
     FIG. 14 is a partial sectional view of the vacuum bottle shown in FIG. 13 wherein an upper cylindrical member is moving upward. 
     FIG. 15 is a partial sectional view of the vacuum bottle wherein the upper cylindrical member has reached its uppermost position. 
     FIG. 16 is a partial sectional view of the vacuum bottle wherein the upper cylindrical member is moving downward. 
     FIG. 17 is a partial sectional view of the vacuum bottle wherein the upper cylindrical member has reached its lowermost position. 
     FIG. 18 is a partial sectional view which illustrates the release of vacuum in the bottle in accordance with the second preferred embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, preferred embodiments of the present invention will be explained in more detail with reference to FIGS. 5 to  18 . 
     A vacuum apparatus according to the present invention can be adapted in a vacuum bottle, a medical instrument, a vacuum enclosure or the like, however hereinafter, the vacuum apparatus will be explained when the apparatus is adapted in a vacuum bottle. The vacuum apparatus according to the present invention is achieved by first and second preferred embodiments. The first and second embodiments are virtually the same with the exception of the configurations of the selectively operatable check valve. 
     First Preferred Embodiment 
     FIGS. 6 and 7 are respectively exploded and assembled views of a vacuum apparatus  300 . 
     Referring to FIGS. 6 and 7, a vacuum apparatus  300  is assembled to a bottle  210  with an upper portion thereof being opened and evacuates an inside of bottle  210  by repetitive pumping operations. Vacuum apparatus  300  comprises a lower cylindrical member  320  with an upper portion thereof being opened and a first disc member  330  assembled to the upper portion of lower cylindrical member  320 . Lower cylindrical member  320  is formed at a center thereof with a circular channel  322 . Circular channel  322  extends upward from a lower portion of lower cylindrical member  320 , at a core portion of which a first passage  324  communicating the inside of bottle  210  with ambient, and at a circumferential portion of which an annular second passage  326  communicating the inside of bottle  210  with space portion  310  are formed. 
     First disc member  330  confines the uppermost position of an upper cylindrical member which engages with circular channel  322 . A first post  332  extends downward from first disc member  330  and has a predetermined clearance against second passage  326 . A circular recess  334  is formed at an upper center portion of first disc member  330 . 
     According to the first embodiment, there is provided an upper cylindrical member  340  with an upper portion thereof being opened. Upper cylindrical member  340  is inserted a lower portion thereof into lower cylindrical member  320  so as to divide space portion  310  into compressible and expandable upper and lower spaces  312  and  314 , as shown in FIG.  8 . 
     Second passage  326  around circular channel  322  communicates with upper space  312  to serve as an air passage. Upper cylindrical member  340  is formed at a lower wall thereof with an opening  342  engaging with circular channel  322 , opening  342  being formed at a inner peripheral portion thereof with a first annular groove  344 . Preferably, a second O-ring  346  is inserted so as to block an airflow between upper and lower spaces  312  and  314 . 
     According to a feature of the first embodiment, there is provided a flexible check valve  350  having a dome-like portion at a center thereof. Check valve  350  makes contact with a lower end of first post  332  at first disc member  330  and selectively closes second passage  326 . Preferably, check valve  350  is made of elastomeric material, and as shown in FIG. 10, is deformed upward at a circumferential portion thereof when a vacuum is formed in upper space  312  thereby opening second passage  326 . As shown in FIG. 11, check valve  350  returns downward when ambient pressure is applied in upper space  312  thereby closing second passage  326 . 
     On the other hand, first disc member  330  is formed at a peripheral portion thereof with a second outward annular groove  336 . Second annular groove  336  is formed at an upper side location thereof with a third passage  338  communicating with ambient. According to a feature of the first embodiment, a third O-ring  360  is inserted into second annular groove  336 , being smaller than second annular groove  336  in height. Third O-ring  360  is slipped downward between an inner wall of upper cylindrical member  340  and a lower end of second annular groove  336  at first disc member  330  when upper cylindrical member  340  moves downward, as shown in FIG. 10, thereby preventing an inflow of ambient air into upper space  312 , and is slipped toward an upper end of second annular groove  336  when upper cylindrical member  340  moves upward, thereby connecting upper space  312  and third passage  338 . 
     According to a feature of the first embodiment, upper cylindrical member  340  is formed at a side wall thereof with a fourth passage  348  communicating with ambient so as to communicate upper space  312  with ambient when the lower wall of upper cylindrical member  340  makes contact with the lower wall of lower cylindrical member  320 . Fourth passage  348  is located such that it communicates with ambient when upper and lower cylindrical members  340  and  320  overlap. 
     Meanwhile, a second compression spring  370  is located between an underside of upper cylindrical member  340  and an upper surface of lower cylindrical member  320 , thereby upward urging upper cylindrical member  340 . 
     Preferably, upper cylindrical member  340  is formed at the upper surface thereof with a first step portion  340   a  and first disc member  330  is formed at an underside thereof with a second step portion  330   a  engaging with first step portion  340   a.  This makes upper space  312  to be fully pressed so that upper space  312  can evacuate more air from bottle  210  when upper cylindrical member  320  moves downward. 
     According to a feature of the first embodiment, there is provided a second disc member  380  inserted into circular recess  334 , and a second post  382  extending downward from second disc member  380  and having a predetermined clearance against first passage  324 . A first O-ring  384  is press-fitted between a lower end of second post  382  and first passage  324  so as to close first passage  324 . In circular recess  334 , a first compression spring  386  is positioned so as to upward urge second disc member  380 . At this time, first passage  324  diverges downward. 
     Preferably, vacuum apparatus  300  further comprises a cover  390  mounted to the upper portion of upper cylindrical member  340  for facilitating for a user the reciprocal movement of upper cylindrical member  340 . On the other hand, a filter  399  is provided at a lower end portion of circular channel  322  of lower cylindrical member  320 . 
     Hereinafter, the operation of vacuum apparatus  300  in accordance with the first embodiment of the present invention will be explained with reference to the sequentially drafted drawings. 
     FIG. 7 shows the vacuum bottle wherein a vacuum is formed inside of bottle  210 . Upper and lower cylindrical members  340  and  320  are formed at the opposing surfaces therebetween with protrusions and recesses which engage with each other, and they are assembled by a relative rotation therebetween. At this time, upper cylindrical member  340  is fully pressed down to the lowermost position. There is formed a vacuum in bottle  210  and space portion  310  communicates with ambient through fourth passage  348 . Accordingly, an ambient pressure is applied on the upper surface of check valve  350  and a vacuum is applied on the underside thereof so that it blocks second passage  326 . 
     As upper cylindrical member  340  moves upward, as shown in FIG. 8, the air in upper space  312  flows out through third passage  338  and continuously flows through a discharge hole  392  and fourth passage  348 , thereby being vented to the ambient. At this time, third O-ring  360  is pressed against the upper end of second annular groove  336  so that third passage  338  communicates with upper space  312 . 
     As upper cylindrical member  340  moves up to its uppermost position, as shown in FIG. 9, first and second step portions  340   a  and  330   a  entirely engages to each other, thereby evacuating upper space  312 . 
     As upper cylindrical member  340  descends, as shown in FIG. 10, upper space  312  is expanded again. At this time, third O-ring  360  is pressed against the lower end of second annular groove  336  by the upper cylindrical member  340  so as to close third passage  338  from upper space  312 . Accordingly, there is formed a vacuum in upper space  312  and thus the vacuum is applied on the upper surface of check valve  350 . At this time, the vacuum in upper space  312  is higher than that of bottle  210  so that the circumferential portion of check valve  350  is upward deformed, thereby communicating second passage  326  with upper space  312 . Therefore, the air inside of bottle  210  is retrieved into upper space  312 . Since upper cylindrical member  340  is upward urged by second compression spring  370 , a user must push down upper cover  390 . 
     When upper cylindrical member  340  moves down to the lowermost position as shown in FIG. 11, fourth passage  348  connects the ambient with upper space  312 . Accordingly, the ambient pressure is applied on the upper surface of check valve  350 , thereby returning check valve  350  downward and closing second passage  326 . 
     In brief, the procedures sequentially shown in FIGS. 7 to  11  are repeated in order to withdraw the air inside of bottle  210  to form a high vacuum state therein. 
     FIG. 12 illustrates the release of the vacuum in bottle  210 . When the user pushes down second disc member  380  manually, second post  382  moves downward and first O-ring  384  is slipped down. Since first passage  234  diverges downward, there is formed a passage between second post  382  and first passage  324 , so that the outside ambient air inflows into bottle  210  therethrough. Thus, the vacuum in bottle  210  is released and lower cylindrical member  320  easily separates from bottle  210 . 
     Second Preferred Embodiment 
     FIG. 13 shows a vacuum apparatus  400  in accordance with a second preferred embodiment of the present invention. 
     Referring to FIG. 13, vacuum apparatus of the second embodiment comprises a means for forming a predetermined space portion  420  in which a vacuum or an ambient pressure is applied. The means is assembled to a bottle or the like  410 . The means includes a lower cylindrical member  430  with an upper portion thereof being opened and at a center portion thereof being formed with a stepped circular channel  432 , and a first disc member  440  coupled to the upper portion of lower cylindrical member  430 . 
     There is provided a means for forming a vacuum or an ambient pressure in space portion  420  by a vertical reciprocal movement thereof. The means includes an upper cylindrical member  450  with an upper portion thereof being opened. Upper cylindrical member  450  is inserted the lower portion thereof into lower cylindrical member  430  thereby dividing space portion  420  into upper and lower spaces  422  and  424 , and the vertical movement thereof is restrained by first disc member  440  and lower cylindrical member  430 . Circular channel  432  communicates with upper space  422 . 
     Preferably, upper cylindrical member  450  is formed at an underside thereof with an opening  452  inserted around circular channel  432 . Opening  452  is formed at a peripheral portion thereof with a first annular groove  454  inward opened. A second O-ring  456  for blocking an airflow between upper and lower spaces  422  and  424  is inserted into first annular groove  454 . A second compression spring  480  is located between an underside of upper cylindrical member  450  and an upper surface of lower cylindrical member  430 , thereby upward urging upper cylindrical member  450 . 
     According to a feature of the invention, there is provided a means for communicating/closing bottle  410  with/from space portion  420  responding to the reciprocal movement of upper cylindrical member  450 . The means includes a dome-like valve support member  460  inserted into an upper portion of circular channel  432  and formed at a center thereof with a first passage  462  for communicating circular channel  432  with space portion  420 , a disc-like check valve  464  pivotally placed on valve support member  460 , an operating member  470  having a leg  472  which pushes a side portion of check valve  464  thereby pivoting the same, and a flexible second disc member  474  for mounting operating member  470  to first disc member  440  such that operating member  470  is vertically movable. There are formed a protruded portion at second disc member  474  and a through hole at operating member  470  which engage with each other whereby they are resiliently assembled. 
     On the other hand, first disc member  440  is formed at a peripheral portion thereof with a second annular groove  442  outward opened. At an upper end of second annular groove  442 , there is formed a third passage  444  communicating upper space  422  with ambient. 
     According to the second embodiment of the present invention, there is provided a third O-ring  446  inserted into second annular groove  442  and being smaller than second annular groove  442  in height. Third O-ring  446  is slipped downward between an inner wall of upper cylindrical member  450  and a lower end of second annular groove  442 , when upper cylindrical member  450  moves downward, thereby preventing an inflow of the ambient air into upper space  422 , and on the contrary, is slipped to an upper end of second annular groove  442  when upper cylindrical member  450  moves upward, thereby connecting upper space  442  and third passage  444 . 
     According to the present invention, upper cylindrical member  450  is formed at a side wall thereof with a fourth passage  458  communicating with the ambient so as to communicate upper space  422  with the ambient, when an underside of upper cylindrical member  450  makes contact with the lower wall of lower cylindrical member  430 . 
     When upper cylindrical member  450  moves downward, second disc member  474  is underlaid at an upper surface thereof with an ambient pressure and at an underside thereof with a vacuum, thereby being deformed downward so that leg  472  of operating member  470  pushes a side portion of check valve  464  so as to pivot the same and an airflow is generated through first passage  462  from bottle  410  to upper space  422 . Furthermore and sequentially, when upper cylindrical member  450  moves lowermost position such that the lower wall of upper cylindrical member  450  makes contact with the lower wall of lower cylindrical member  430 , fourth passage  458  is opened thereby communicating upper space  422  with the ambient and applying an ambient pressure to the underside of second disc member  474  so that second disc member  474  returns upward and check valve  464  closes first passage  462 . 
     Preferably, upper cylindrical member  450  is formed at the upper surface thereof with a first step portion  450   a  and first disc member  440  is formed at an underside thereof with a second step portion  440   a  engaging with first step portion  450   a.  This makes the inside of upper space  422  be squeezed when upper cylindrical members  450  and first disc member  440  meet so that a suction force generated due to the expansion of upper space  422  is maximized. 
     In addition, vacuum apparatus  400  further comprises a cover  490  mounted to the upper portion of upper cylindrical member  450  for facilitating for a user the reciprocal movement of upper cylindrical member  450 . 
     Meanwhile, a filter  499  is provided at a lower end portion of circular channel  432  of lower cylindrical member  430 . 
     Hereinafter, the operation of vacuum apparatus  400  will be explained with reference to the accompanying and sequentially drawn figures. 
     FIG. 13 shows vacuum apparatus  400  wherein upper cylindrical member  450  moves down to the lowermost position. At this time, upper and lower cylindrical members  450  and  430  are engaged by a rotation therebetween. Second disc member  474  is underlaid at the upper surface thereof being applied with the ambient pressure and at the underside thereof being applied with the ambient pressure since fourth passage  458  makes upper space  422  communicate with the ambient. Accordingly, second disc member  474  and operating member  470  remain unchanged. Also, check valve  464  is underlaid at the upper surface thereof being applied with the ambient pressure and at the underside thereof being applied with a vacuum so that it maintains its original horizontal position and blocks second passage  462 . 
     As upper cylindrical member  450  moves upward as shown in FIG. 14, the air in upper space  422  is vented to the ambient through third passage  444 . At this time, third O-ring  446  is pressed against the upper end of second annular groove  442 , thereby communicating upper space  422  with third passage  444 . 
     As upper cylindrical member  450  moves uppermost as shown in FIG. 15, first and second step portions  450   a  and  440   a  is entirely engaged so that the air inside of upper space  422  is squeezed. 
     As upper cylindrical member moves downward as shown in FIG. 16, third O-ring  446  is pressed against the lower end of second annular groove  442  so as to close upper space  422  from the outside thereof. Accordingly, the inner pressure of upper space  422  gradually decreases so that there is applied a pressure on the underside of second disc member  474  lower than the atmospheric pressure. Thus, second disc member  474  deforms downward and accordingly leg  472  of operating member  470  pushes down a side of check valve  464  so as to pivot the same. As a result, first passage  462  communicates with upper space  422  so that the air inside of bottle  410  flows into upper space  422 , thereby evacuating bottle  410 . 
     When upper cylindrical member  450  descends to its lowermost position as shown in FIG. 17, fourth passage  458  makes upper space  422  communicate with the ambient, thereby drawing the outside air into upper space  422 . Accordingly, at the underside of second disc member  474 , the atmospheric pressure is applied again and second disc member  474  returns upward. Simultaneously, check valve  464  closes first passage  462  and maintains the vacuum state of bottle  410 . 
     To release the vacuum inside of bottle  410 , a user must push down second disc member  474  manually as shown in FIG.  18 . Then, check valve  464  pivots by operating member  470  and makes first passage  462  communicate with upper space  422  which in turn communicates with the ambient through fourth passage  458 , thereby introducing the outside air into bottle  410 . 
     As described above, the first and the second embodiments achieve a high vacuum easily inside of the space member such as a bottle, a medical evacuation instrument or the like by repetitive reciprocal operation and maintain a stable vacuum status. 
     Although the preferred embodiments of the invention have been described, it is understood that the present invention should not be limited to these preferred embodiments, but various changes and modifications can be made by one skilled in the art within the spirit and scope of the invention as hereinafter claimed.