Abstract:
The Dispenser for sucking back contents is provoded, which makes it possible to prevent over consumption of contents in such a way to suck back the contents remaining at an end portion of a nozzle of a button of a dispenser after the contents are discharged and used, and also makes it possible to prevent a container body from being contaminated by contents.

Description:
BACKGROUND 
       [0001]    The present invention relates to a dispenser for sucking back contents, and more particularly to a dispenser for sucking back contents which makes it possible to prevent over consumption of contents in such a way to suck back the contents remaining at an end portion of a nozzle of a button of a dispenser after the contents are discharged and used, and also makes it possible to prevent a container body from being contaminated by contents. 
         [0002]    Common liquid or sticky liquid type cosmetic is stored in a dispenser container and is used as it is discharged by a certain amount. The dispenser container is equipped with a dispenser at the top of a container which stores contents. The above dispenser is pumped when a button with a nozzle is pressed for thereby discharging contents from the dispenser container. 
         [0003]    In case of the above mentioned dispenser, when a user presses the button so as to discharge contents, the contents remains at an end portion of the nozzle after the contents is discharged. In this event, the contents remaining at the end portion of the nozzle may move down and contaminate the container and may be spoiled as it directly contact with air. In worse case, the contents may be hardened and block the nozzle. When such situation occurs, the user first needs to remove the hardened and stuck contents when in use. The contents may be over consumed. 
         [0004]    Under the above described problems in the conventional art, many researchers are strongly interested in developing various dispensers which are capable of sucking back the contents remaining at the end portion of the nozzle in an attempt to prevent the container from being contaminated. 
       SUMMARY OF THE INVENTION 
       [0005]    Accordingly, it is an object of the present invention to provide a dispenser for sucking back contents which makes it possible to prevent over consumption of contents in such a way to suck back the contents remaining at an end portion of a nozzle of a button of a dispenser after the contents are discharged and used, and also makes it possible to prevent a container body from being contaminated by contents. 
         [0006]    To achieve the above objects, there is provided a dispenser for sucking back contents, comprising a body which is engaged to the top of a container body; an engaging body which is engaged to the body and fixes a cylinder and is hollow; a cylinder which is engaged to the bottom of the engaging body and has a content input hole formed at the bottom for inputting contents and a valve member which is opened and closed by the pressure of contents in the content input hole; a stem which passes through the hollow interior of the engaging body and has a support shoulder at an inner surface; a piston rod which is engaged to the stem, the bottom of which piston rod is equipped with a spring support part, and the top of which has a spring engaging protrusion which protrudes in an upward direction; a sealing cap which is installed at the bottom of the stem, the outer surface of the sealing cap coming into close contact with an inner surface of the cylinder; a first spring which is installed in the interior of the cylinder and serves to provide an elastic force to the piston rod; a second spring which is installed surrounding the spring engaging protrusion of the piston rod, the bottom of which second spring is supported by the piston rod, and the top of which is supported by the support shoulder of the stem for thereby providing an elastic force in an upward direction; and a button which is engaged to the top of the stem and has a nozzle for discharging contents. 
         [0007]    In addition, the second spring is contracted by a support shoulder when the stem descends and recovers for thereby allowing the stem to ascend, so the contents remaining at an end portion of the nozzle is sucked back as much as the distance defined as the support shoulder of the stem and the spring engaging protrusion of the piston rod are spaced apart. 
         [0008]    In addition, the sealing cap is made from an elastic material and is contracted by a pressure of the stem when the stem descends and recovers, so the stem is allowed to ascend by a change of the length of the sealing cap, for thereby sucking back the contents remaining at an end portion of the nozzle. 
         [0009]    The present invention is advantageous because it is possible to prevent over consumption of contents in such a way to suck back the contents remaining at an end portion of a nozzle of a button of a dispenser after the contents are discharged and used, and also makes it possible to prevent a container body from being contaminated by contents. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0010]      FIG. 1  is a cross sectional view illustrating a construction of a dispenser for sucking back contents according to a preferred embodiment of the present invention. 
           [0011]      FIGS. 2 to 5  are views for explaining a suck-back procedure of contents of a dispenser for sucking back contents according to a preferred embodiment of the present invention. 
           [0012]      FIG. 6  is a cross sectional view illustrating a state that a dispenser for sucking back contents is engaged to a container body according to a preferred embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0013]    The preferred embodiments of the present invention will be described with reference to the accompanying drawings. 
         [0014]      FIG. 1  is a cross sectional view illustrating a construction of a dispenser for sucking back contents according to a preferred embodiment of the present invention.  FIGS. 2 to 5  are views for explaining a suck-back procedure of contents of a dispenser for sucking back contents according to a preferred embodiment of the present invention.  FIG. 6  is a cross sectional view illustrating a state that a dispenser for sucking back contents is engaged to a container body according to a preferred embodiment of the present invention. 
         [0015]    As best seen in  FIGS. 1 to 6 , the dispenser for sucking back contents according to the present invention comprises a body  100 , an engaging body  200 , a cylinder  300 , a stem  400 , a piston rod  500 , a sealing cap  600 , a first spring  700 , a second spring  800  and a button  900 . 
         [0016]    The body  100  is engaged to the top of the container body  10  which is filled with contents “a” for thereby closing the open top of the container body  10 , and the body  100  has an engaging shoulder  110  at its inner side for an engagement to the engaging body  200 . 
         [0017]    The engaging body  200  is engaged to the body  100  for thereby fixing the cylinder  300  and has an engaging protrusion  210  at its portion which comes into contact with the engaging shoulder  110 , for the engaging protrusion  210  to be fixedly mounted at the engaging shoulder  110  of the body  100 . 
         [0018]    The engaging body  200  is formed in a hollow shape for the stem  400  to pass through. 
         [0019]    The cylinder  300  is engaged to the bottom of the engaging body  200  and has a content input hole  310  at its lower side for the content stored in the container body  100  to input. It is preferred that a valve member  320  is installed at the content input hole  310  for the purpose of preventing a reverse flow of contents as it is opened and closed by the pressure of the contents. 
         [0020]    The stem  400  passes through the hollow portion of the engaging body  200  and is formed in a cylindrical shape the top and bottom of which communicate with each other for the contents to pass through. In the present invention, at an inner surface of the stem  400  is provided a support shoulder  410  supporting the top of the second spring  800 . When the stem  400  descends by the pressure of the button  900 , the second spring  800  pressurizes the second spring  800  and moves down and comes into contact with the top of the spring engaging protrusion  520  of the piston rod  500  for hereby transferring a pressure to the piston rod  500 , so the piston rod  500  moves downward. 
         [0021]    The piston rod  500  is inserted into the bottom of the stem  400 . A certain space is formed in the longitudinal direction for the sake of the movement of the contents. At the bottom of the piston rod  500  is provided a spring support part  510  supporting the top of the first spring  700  for the piston rod  500  to ascend by means of an elastic force of the first spring  700 . 
         [0022]    In the present invention, at the top of the piston rod  500  is provided a spring engaging protrusion  520  which protrudes in the upward direction for the sake of the installation of the second spring  800 . The spring engaging protrusion  520  serves to prevent the distortion of the second spring  800  and to guide the movements when the second spring  800  contracts and releases as the stem  400  descends and ascends. 
         [0023]    Coming into contact with the support shoulder  410  of the stem  400 , the spring engaging protrusion  520  helps generate a vacuum pressure in the interior of the stem  400  as much as the distance spaced apart from the support shoulder  410  when the stem  400  ascends by means of an elastic force of the second spring  800  for thereby sucking back the contents remaining at the end portion of the nozzle  910 . 
         [0024]    Surrounding the stem  400  and the piston rod  500 , the sealing cap  600  is installed at the bottom of the stem  400 . 
         [0025]    In the present invention, the sealing cap  600  is made from an elastic material, the top of which is supported by the stem  400 , the bottom of which is supported by the piston rod  500 , so when the stem  400  descends, it is pressurized by the pressure of the stem  400  and then recovers for thereby allowing the stem  400  to ascend. A vacuum pressure is generated in the interior of the stem  400  as much as the length changed by a change in the length of the sealing cap  600  which occurs when the sealing cap  600  is compressed and recovers for thereby sucking back the contents remaining at the end portion of the nozzle  910 . 
         [0026]    The first spring  700  is installed in the interior of the cylinder  300 , the bottom of which first spring is mounted at the spring mounting shoulder  330  formed at the bottom of the inner side of the cylinder  300 , the other side of which is supported by the spring support part  510  of the piston rod  500  for thereby generating and transferring an elastic force to the piston rod  500  during the pumping operations. 
         [0027]    The second spring  800  surrounds the spring engaging protrusion  520  of the piston rod  500 , the bottom of which second spring is supported by the piston rod  500 , the top of which is supported by the support shoulder  410  of the stem  400  for thereby providing an elastic force in the upward direction during pumping operation, so the stem  400  ascends. 
         [0028]    In the present invention, the second spring  800  is contracted by the support shoulder  410  when the stem  400  descends by a pressure of the button  900  and recovers when the pressurization of the button  900  is removed for thereby allowing the stem  400  to ascend, so the support shoulder  410  of the stem  400  and the spring engaging protrusion  520  of the piston rod  500  becomes spaced apart. The stem  400  ascends by an elastic force of the second spring  800 , and a vacuum space is generated in the interior of the stem  400  as much as the distance “H” defined as the support shoulder  410  and the spring engaging protrusion  520  are spaced apart for thereby sucking back the contents remaining at the end portion of the nozzle  910 . 
         [0029]    The button  900  is engaged to the top of the stem  400  and transfers a pressure to the stem  400  as a user pressurizes and has a nozzle  910  through which the contents moving through the stem  400  are discharged outside. 
         [0030]    As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described examples are not limited by any of the details of the foregoing description, unless otherwise specified, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.