Patent Publication Number: US-11661253-B2

Title: Packing structure

Description:
CROSS-REFERENCE TO PRIOR APPLICATIONS 
     This application is a national Stage Patent Application of PCT International Patent Application No. PCT/KR2019/009878, filed on Aug. 7, 2019 under 35 U.S.C. § 371, which claims priority of Korean Patent Application Nos. 10-2018-0096991, filed on Aug. 20, 2018 and 10-2019-0004695, filed on Jan. 14, 2019, which are all hereby incorporated by reference in their entirety. 
     TECHNICAL FIELD 
     The present invention relates to a packing structure, and more particularly, to a packing structure that is capable of tightly sealing a gap between two bodies and capable of maintaining the tight contact therebetween. 
     BACKGROUND ART 
     Generally, various kinds of food or food materials are put and stored in airtight containers with different sizes and shapes. If the airtight containers with various sizes are prepared according to an amount of food or material to be stored therein, the number of airtight containers increases to require a large space for arrangements of the containers. Further, if the amount of food or food material stored in one airtight container decreases, the food or food material has to move to another airtight container smaller than the airtight container so as to enhance degrees of space utilization of the containers. So as to solve such problem, a container adjustable in height is disclosed in Korean Patent No. 10-1493878, and the conventional container is capable of being adjustable in height to increase and decrease an amount of content accommodated therein, thereby being advantageous in utilizing space, keeping the freshness of the content, and washing. 
       FIG.  1    shows the conventional container adjustable in height. Referring to  FIG.  1   , the conventional container  1  adjustable in height includes a first body  10  having a plurality of height adjusting parts  12  located on the outer periphery thereof in upward and downward directions, each height adjusting part  12  having a plurality of guide grooves arranged thereon in such a manner as to be inclined symmetrically to each other and a plurality of fixing grooves connected horizontally with the guide grooves in such a manner as to be alternately arranged up and down, a second body  20  fitted to the first body  10  and having guide protrusions  22  guided along the height adjusting parts  12 , and a cap  30  for opening and closing top of the second body  20 , so that as the guide protrusions  22  of the second body  20  move upward and downward along the height adjusting parts  12 , the entire height of the container  1  can be adjusted. Further, a ring-shaped rubber packing member  18  is provided along an installation groove  19  formed on a top outer periphery of the first body  10  so as to allow the first body  10  to come into tight contact with the inner periphery of the second body  20 . The packing member  18  is configured to seal a gap between the first body  10  and the second body  20 . 
       FIG.  2    is a sectional view showing a specific structure of the packing member applied to the conventional container adjustable in height. 
     Referring to  FIGS.  1  and  2   , the conventional packing member  18  includes a ring-shaped support portion  18   a  inserted into the installation groove  19  of the first body  10  and one or more protrusion portions  18   b  protruding from the support portion  18   a  toward the inner periphery of the second body  20 . Also, the end peripheries of the protrusion portions  18   b  come into close contact with the inner periphery of the second body  20 . As a pushing force applied from the end peripheries of the protrusion portions  18   b  to the inner periphery of the second body  20  is relatively weak, however, the end peripheries of the protrusion portions  18   b  are momentarily separated from the second body  20  in a process where the second body  20  moves upward or downward, and through the gap generated, in this case, external air may enter the first body  10  and the second body  20 . Otherwise, the food accommodated in the first body  10  and the second body  20  may be discharged to the outside. 
     Referring to an injection molding process for making the packing member  18 , on the other hand, a resin is injected into a mold (not shown) having the shape of the packing member  18 , and after that, if the resin is cured, the cured resin is separated from the mold to obtain the packing member  18  finally made. When the cured resin is forcedly separated from the mold, however, the inner periphery of the packing member  18 , which is inserted into the installation groove  19 , is not separated from the mold well, and in some cases, accordingly, a scrab portion may protrude unnecessarily from the inner periphery of the packing member  18 . Even in a process of other molding like press molding, the scrab portion may protrude unnecessarily from the inner periphery of the packing member  18 . As the scrab portion inhibits the inner periphery of the packing member from coming into close contact with the installation groove  19 , undesirably, a gap may be formed between the inner periphery of the packing member  18  and the installation groove  19 . 
     DISCLOSURE 
     Technical Problem 
     Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the related art, and it is an object of the present invention to provide a packing structure that is capable of tightly sealing a gap between a first body and a second body. 
     It is another object of the present invention to provide a packing structure that is capable of being preventing from turning over in a process where a second body moves upward and downward. 
     It is yet another object of the present invention to provide a packing structure that is capable of preventing a scrab portion formed in a molding process thereof from having no influence on a sealing force thereof. 
     Technical Solution 
     To accomplish the above-mentioned objects, according to one aspect of the present invention, there is provided a packing structure having a packing located between one side of a first body and one side of a second body facing each other, the packing including a tight contact portion whose inner periphery coming into close contact with one side of the first body, an extension portion extended inclinedly upward from the lower outer periphery of the tight contact portion toward one side of the second body, and a support protrusion protruding from the outer periphery of the tight contact portion facing the extension portion toward the extension portion. 
     Further, if the extension portion is elastically deformed toward the tight contact portion by means of the pressure applied from one side of the second body, the support protrusion supports the extension portion in an outward direction thereof and the tight contact portion is kept in a state of coming into tight contact with the first body. 
     Furthermore, if a downward pressure is applied to top end periphery of the extension portion coming into contact with the second body when the second body moves downward, a pressurization point located on top end periphery of the extension portion in such a manner as to come into contact with the support protrusion is supported against the support protrusion, so that the top end periphery of the extension portion is supported, without any downward deformation. 
     Moreover, the pressurization point coming into contact with the support protrusion enters the inner periphery of the extension portion by means of the pressurization of the support protrusion. 
     The packing structure according to the present invention further includes a protrusion portion protruding bendedly from the outer periphery of the extension portion toward one side of the second body. 
     The packing structure according to the present invention further includes an auxiliary protrusion protruding from the outer periphery of the extension portion that does not face the tight contact portion, so that if the extension portion is elastically deformed toward the tight contact portion by means of the pressure applied from one side of the second body, the auxiliary protrusion is kept in a state of coming into tight contact with one side of the second body. 
     Also, the tight contact portion has a connection portion protruding from the lower periphery thereof in such a manner as to be connected unitarily to the lower periphery of the extension portion. 
     Further, the tight contact portion has a connection portion protruding from the lower periphery thereof in such a manner as to be connected unitarily to the lower periphery of the extension portion, and the auxiliary protrusion is located lower than the support protrusion, so that if the extension portion is elastically deformed toward the tight contact portion by means of the pressure applied to the auxiliary protrusion from one side of the second body coming into contact with the auxiliary protrusion, the lower periphery of the extension portion is elastically deformed and is thus bent toward the gap between the connection portion and the support protrusion. 
     Moreover, the tight contact portion includes an auxiliary contact protrusion protruding from the inner periphery thereof. 
     To accomplish the above-mentioned objects, according to another aspect of the present invention, there is provided a packing structure having a packing located between one side of a first body and one side of a second body facing each other, the packing including a tight contact portion whose inner periphery coming into close contact with one side of the first body, an extension portion extended inclinedly upward from the lower outer periphery of the tight contact portion toward one side of the second body, a protrusion portion protruding from the outer periphery of the extension portion toward one side of the second body, and a contact portion protruding bendedly upward from the end periphery of the protrusion portion in such a manner as to move and come into contact with the tight contact portion by means of one side of the second body. 
     Also, the protrusion portion is elastically deformed toward the tight contact portion by means of the pressure applied to the protrusion portion from one side of the second body coming into contact with the protrusion portion, and a thickness of the protrusion portion is larger than a thickness of the extension portion. 
     Moreover, the contact portion protrudes bendedly upward from the end periphery of the protrusion portion in such a manner as to be inclined toward a direction distant from the protrusion portion. 
     Further, the extension portion includes a top extension portion, an underside extension portion located on the underside of the top extension portion, and a vertical extension portion extended from the side periphery of the top extension portion connected to the tight contact portion in such a manner as to be vertical with respect to the tight contact portion. 
     Further, the extension portion includes a top extension portion and an underside extension portion located on the underside of the top extension portion, and a thickness between top of the top extension portion and top of the underside extension portion is larger than a thickness between underside of the top extension portion and underside of the underside extension portion. 
     Also, the first body includes a concave portion formed on one side thereof in such a manner as to insert the tight contact portion thereinto, and the concave portion includes a fitting concave portion formed on one side or both sides thereof in such a manner as to fit the end periphery of the tight contact portion thereto. 
     Advantageous Effects 
     According to the present invention, the packing structure is configured to allow the support protrusion to be pressurized against the extension portion, so that the support protrusion pressurizes the tight contact portion toward the first body, thereby tightly sealing the gap between the tight contact portion and the first body. 
     In addition, the packing structure according to the present invention is configured to allow the support protrusion to pressurize the extension portion toward the second body, thereby tightly sealing the gap between the protrusion portion connected to the extension portion and the second body. 
     Also, the packing structure according to the present invention is configured to allow the extension portion to have the vertical extension portion adapted to apply a strong pressure to the first body, thereby tightly sealing the gap between the tight contact portion connected to the vertical extension portion and the first body. 
     Further, the packing structure according to the present invention is configured to allow the extension portion to come into contact with the support protrusion when the second body moves downward, so that the extension portion is supported against the support protrusion and is thus prevented from turning over. 
     Furthermore, the packing structure according to the present invention is configured to allow the auxiliary contact protrusion to protrude from the tight contact portion in such a manner as to come into close contact with the first body, irrespective of the scrab portion formed on the packing, thereby tightly sealing the gap between the tight contact portion and the first body. 
     Moreover, the packing structure according to the present invention is configured to allow the auxiliary protrusion protruding from the extension portion and the protrusion portion to come into tight contact with the second body, thereby doubly sealing the gap between the extension portion and the second body through the auxiliary protrusion and the protrusion portion. 
     Additionally, the packing structure according to the present invention is configured to allow the lower periphery of the extension portion to be elastically deformed and thus bent toward the gap between the connection portion and the support protrusion, but in this case, a force of returning to a state before bent is applied to the extension portion by means of its elastic force, so that the auxiliary protrusion connected to the extension portion can come into contact with the second body more tightly. 
     Furthermore, the packing structure according to the present invention is configured to allow the contact portion to be elastically deformed in such a manner as to be distant from the second protrusion portion if the second body pressurizes the second protrusion portion toward the first body, and in this case, through its own tension of the contact portion, the contact portion pressurizes the second tight contact portion more strongly, so that the gap between the contact portion and the second tight contact portion can be tightly sealed. Further, in the process where the contact portion is elastically deformed toward the second tight contact portion, additional tension occurs, and accordingly, a pressure is applied from the second protrusion portion to the second body, so that the gap between the second protrusion portion and the second body can be tightly sealed. Also, since a pressure is applied from the contact portion to the second tight contact portion, the gap between the second tight contact portion and the first body can be tightly sealed. 
     In addition, the packing structure according to the present invention is configured to allow the top periphery of the extension portion to be thicker than the bottom periphery thereof, and in this case, the elastic strength of the top periphery of the extension portion becomes stronger than that of the bottom periphery thereof, so that if the second body moves downward, the protrusion portion does not turn over arbitrarily in the downward direction by means of the strong elastic strength of the extension portion. 
     Further, the packing structure according to the present invention is configured to allow the end periphery of the tight contact portion to be fitted to the fitting concave portion, so that the tight contact portion can be firmly coupled to the concave portion, without any escape from the concave portion. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view showing a conventional container adjustable in height. 
         FIG.  2    is a sectional view showing a specific structure of a packing member applied to the conventional container adjustable in height. 
         FIG.  3    is a schematic perspective view showing a packing structure according to a first embodiment of the present invention. 
         FIG.  4    is a schematic sectional view showing the packing structure according to the first embodiment of the present invention. 
         FIG.  5    is a sectional view showing a state where a first packing is pressurized against a second body moving upward in the packing structure according to the first embodiment of the present invention. 
         FIG.  6    is a sectional view showing an example of a first packing in conventional practice. 
         FIG.  7    is a sectional view showing a state where the first packing in the conventional practice turns over by means of a second body. 
         FIG.  8    is a sectional view showing a state where the first packing is pressurized against the second body moving downward in the packing structure according to the first embodiment of the present invention. 
         FIG.  9    is a sectional view showing another state where the first packing is pressurized against the second body moving downward in the packing structure according to the first embodiment of the present invention. 
         FIG.  10    is a sectional view showing another example of a first protrusion portion protruding from the first packing of the packing structure according to the first embodiment of the present invention. 
         FIG.  11    is a sectional view showing an auxiliary contact protrusion of the first packing of the packing structure according to the first embodiment of the present invention. 
         FIG.  12    is a perspective view showing another example of the first packing of the packing structure according to the first embodiment of the present invention. 
         FIG.  13    is a sectional view showing yet another example of the first packing of the packing structure according to the first embodiment of the present invention. 
         FIG.  14    is a sectional view showing still another example of the first packing of the packing structure according to the first embodiment of the present invention. 
         FIG.  15    is a sectional view showing a state where the first packing is pressurized against the second body in the packing structure according to the first embodiment of the present invention. 
         FIGS.  16 A and  16 B  are sectional views showing other examples of the first packing of the packing structure according to the first embodiment of the present invention. 
         FIG.  17    is a sectional view showing a state where the first packing is pressurized against the second body in the packing structure according to the first embodiment of the present invention. 
         FIG.  18    is a schematic perspective view showing a packing structure according to a second embodiment of the present invention. 
         FIG.  19    is a schematic sectional view showing the packing structure according to the second embodiment of the present invention. 
         FIG.  20    is a sectional view showing a contact portion formed on a second packing in the packing structure according to the second embodiment of the present invention. 
         FIG.  21    is a perspective view showing another example of the second packing in the packing structure according to the second embodiment of the present invention. 
         FIG.  22    is a sectional view showing yet another example of the second packing in the packing structure according to the second embodiment of the present invention. 
         FIG.  23    is a perspective view showing a first body and a second body to which the packing structure according to the first embodiment of the present invention is applied. 
         FIG.  24    is a sectional view showing the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
         FIG.  25    is a sectional view showing a state where the first body and the second body, to which the packing structure according to the first embodiment of the present invention is applied, are coupled to each other. 
         FIG.  26    is a perspective view showing other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
         FIG.  27    is a perspective view showing yet other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
         FIG.  28    is a perspective view showing still other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
         FIG.  29    is a sectional view showing other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
         FIG.  30    is a sectional view showing a state where the first body and the second body, to which the packing structure according to the first embodiment of the present invention is applied, are coupled to each other. 
         FIG.  31    is a sectional view showing still other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
     
    
    
     EXPLANATIONS OF REFERENCE NUMERALS IN THE DRAWINGS 
     
         
         
           
               100 ,  101 ,  102 - 1 ,  102 - 2 : first body  101   a : edge portion 
               110 ,  111 : concave portion  111   a : fitting concave portion 
               200 ,  201 ,  202 ,  203 ,  204 : second body  212 : second edge portion 
               300 : first packing 
               310 : first tight contact portion,  320 ,  321 : first extension portion 
               322 : first top extension portion,  322   a : first vertical extension portion 
               324 : first underside extension portion,  326 ,  327 : connection portion 
               330 ,  332 : first protrusion portion,  340 : support protrusion 
               350 : first auxiliary contact protrusion,  352 : scrab portion 
               360 : auxiliary protrusion 
               400 : second packing 
               410 : second tight contact portion,  420 : second extension portion 
               422 : second top extension portion,  422   a : second vertical extension portion 
               424 : second underside extension portion,  424   a : convex portion 
               430 : second protrusion portion,  440 : connection portion 
               450 : second auxiliary contact protrusion 
           
         
       
    
     BEST MODE FOR INVENTION 
     Hereinafter, an explanation of a packing structure according to the present invention will be given in detail with reference to the attached drawings. 
       FIG.  3    is a schematic perspective view showing a packing structure according to a first embodiment of the present invention, and  FIG.  4    is a schematic sectional view showing the packing structure according to the first embodiment of the present invention. 
     Referring to  FIGS.  3  and  4   , a packing structure according to a first embodiment of the present invention includes a first packing  300  disposed between a first body  100  (See  FIG.  5   ) and a second body  200  (See  FIG.  5   ). 
     The first body  100  and the second body  200  constitute a container in which a given content like food or food material is stored, and the first body  100  has a cylindrical shape and accommodates the food or food material put through open bottom portion thereof. An inner diameter of the second body  200  is larger than an outer diameter of the first body  100 , and the second body  200  inserts the first body  100  thereinto through open bottom portion thereof. Further, the first body  100  has a concave portion  110  (See  FIG.  5   ) formed along the outer periphery thereof in such a manner as to insert a first tight contact portion  310  as will be discussed later thereinto. The first and second bodies  100  and  200  have the similar functions and structures to the first and second bodies  10  and  20  as shown in  FIG.  1   , and the second body  200  further includes a cap (not shown) for opening and closing the top open thereof. Also, the present invention is not limited to the above-mentioned structure, and in some cases, the second body serves as a typical cap. In this case, the second body is fixed to the first body in the state where top of the second body is closed. In this case, the concave portion is formed along the top end periphery of the first body in such a manner as to be covered with the closed top of the second body. 
     According to the first embodiment of the present invention, on the other hand, the first and second bodies  100  and  200  have circular horizontal section shapes, but of course, they are not limited thereto. In some cases, they may have polygonal or oval horizontal section shapes. 
     The first packing  300  is made of a material having water tightness and elasticity like synthetic rubber, silicone, and so on and includes the first tight contact portion  310  inserted into the concave portion  110  formed on the outer periphery of the first body  100  in a state where the first body  100  is inserted into the second body  200 , a first extension portion  320  extended inclined upward from the outer periphery of the first tight contact portion  310  toward the opposite direction to the first body  100 , and a first protrusion portion  330  protruding from the outer periphery of the first extension portion  320  toward the inner periphery of the second body  200 . 
     The first tight contact portion  310  has the shape of a ring, and the inner periphery of the first tight contact portion  310  coming into contact with the first body  100  is flattened in such a manner as to come into close contact with the concave portion  110  of the first body  100 . 
     Referring to the specific shape of the first extension portion  320 , the first extension portion  320  includes a first top extension portion  322  formed inclinedly in such a manner as to allow top end periphery thereof to be connected to the first protrusion portion  330  and to allow bottom end periphery thereof to be extended toward the bottom periphery of the first tight contact portion  310  and a first underside extension portion  324  formed inclinedly on the underside of the first top extension portion  322 . Further, the first extension portion  320  includes a first vertical extension portion  322   a  extended unitarily from the bottom periphery of the first top extension portion  322  connected to the first tight contact portion  310  in such a manner as to be vertical with respect to the first tight contact portion  310 . In this case, the bottom end periphery of the first tight contact portion  310  is connected unitarily to the first underside extension portion  324  in such a manner as to be bent by the inclined angle of the first underside extension portion  324 . In specific, the bottom end periphery of the first top extension portion  322  is vertically connected unitarily to the first tight contact portion  310  by means of the first vertical extension portion  322   a , and the first underside extension portion  324  is inclinedly connected unitarily to the bottom end periphery of the first tight contact portion  310 . 
     The first protrusion portion  330  is bendedly extended from the first extension portion  320  in such a manner as to come into close contact with the inner periphery of the second body  100 , thereby making a force for pushing an external pressure generated from the second body  200  stronger. Accordingly, the first protrusion portion  330  and the second body  200  always come into tight contact with each other, so that the first protrusion portion  330  is not arbitrarily separated from the second body  200 , thereby providing a tight sealing force. 
     Further, the first packing  300  includes a support protrusion  340  protruding from the outer periphery of the first tight contact portion  310  facing the first extension portion  320  toward the first extension portion  320 . For example, the support protrusion  340  has a triangular section shape, but according to the present invention, of course, the support protrusion  340  is not limited thereto. 
     Furthermore, the first packing  300  includes an auxiliary contact protrusion  350  protruding from the inner periphery of the first tight contact portion  310 . When the first extension portion  320  protrudes from the outer bottom periphery of the first tight contact portion  310 , the auxiliary contact protrusion  350  protrudes from the inner top periphery of the first tight contact portion  310 . 
       FIG.  5    is a sectional view showing a state where the first packing is pressurized against the second body moving upward in the packing structure according to the first embodiment of the present invention. 
     Referring to  FIG.  5   , if the second body  200  moves upward in a state where the first body  100  is inserted into the second body  200 , the first protruding portion  330  comes into close contact with the second body  200  in such a manner as to be elastically deformed toward the first body  100 . In this case, the support protrusion  340  is pressurized against the first extension portion  320  to allow the first tight contact portion  310  to be pressurized toward the first body  100 . Like this, the first tight contact portion  310  applies a strong pressure to the concave portion  110  of the first body  100  by means of the support protrusion  340 , so that a gap between the first tight contact portion  310  and the concave portion  110  can be tightly sealed. 
     Since the support protrusion  340  allows the first extension portion  320  to be pressurized against the second body  200 , further, a gap between the first protrusion portion  330  connected to the first extension portion  320  and the second body  200  can be tightly sealed. Even if time passes, also, the elastic force or returning force of the support protrusion  340  is not deteriorated, so that the elastic force or returning force is consistently maintained for a long time. Further, the support protrusion  340  has the shape of the ring formed along the outer periphery of the first tight contact portion  310 , so that even if the first extension portion  320  is partially twisted by means of the pressurization of the second body  200 , the support protrusion  340  can firmly pressurize the first extension portion  320 . 
     Moreover, one side periphery of the first vertical extension portion  322   a  is connected vertically to the first tight contact portion  310 . Even if a pressure is applied from the second body  200  to the first vertical extension portion  322   a , accordingly, the first vertical extension portion  322   a  is not deformed in shape, so that the first top extension portion  322  connected to the other side periphery of the first vertical extension portion  322   a  is elastically kept spaced apart from the first tight contact portion  310  to allow the first protrusion portion  330  connected unitarily to the first top extension portion  322  and the first underside extension portion  324  to be kept to a state of coming into tight contact with the inner periphery of the second body  200 , thereby tightly sealing the gap between the first protrusion portion  330  and the second body  200 . 
     On the other hand, the end periphery of the first protrusion portion  330  is rounded, and accordingly, the first protrusion portion  330  has line contact with the inner periphery of the second body  200 , thereby allowing the contact area to be relatively small and allowing a frictional force therebetween to be small, so that when the second body  200  moves downward, the first protrusion portion  330  does not turn over. This will be described with reference to  FIG.  8    later. 
       FIG.  6    is a sectional view showing an example of a first packing in conventional practice, and  FIG.  7    is a sectional view showing a state where the first packing in the conventional practice turns over by means of a second body. 
     Referring to  FIGS.  6  and  7   , a first packing  50  includes a contact portion  52  coming into close contact with the inner periphery of the first body  10  and an inclined portion  54  protruding inclinedly upward from the bottom periphery of the contact portion  52 . The inclined portion  54  has a first length d 1  and an imaginary support axis P located at the bottom end periphery connected to the first body  10 . 
     The inclined portion  54  is formed inclinedly with respect to the contact portion  52 , and if a pressure is applied from the second body  20  moving downward to the inclined portion  54 , accordingly, the top end periphery of the inclined portion  54  is deformed in shape by means of its own elasticity and thus moves toward the first body  10 . As the support force of the inclined portion  54  is not sufficient, in this case, the inclined portion  54  turns over in a downward direction around the support axis P located at the bottom end periphery thereof. 
     In this case, the reason why the inclined portion turns over is as follows: firstly, the top end periphery of the inclined portion  54  has surface contact with the second body  200  to cause the contact area to be large, thereby increasing a frictional force therebetween, and secondly, the first length d 1  between the top end periphery of the inclined portion  54  and the support axis P is relatively long. Generally, the longer a length is, the larger elastic deformation occurs, and if a downward pressure is applied to the inclined portion  54 , accordingly, the elastic force of the inclined portion  54  does not support the downward pressure, so that the inclined portion  54  turns over by means of the downward pressure. 
       FIG.  8    is a sectional view showing a state where the first packing is pressurized against the second body moving downward in the packing structure according to the first embodiment of the present invention. 
     Referring to  FIG.  8   , if the second body  200  moves downward in a state where the first body  100  is inserted into the second body  200 , the first protrusion portion  330  comes into close contact with the second body  200 . In this case, the end periphery of the first protrusion portion  330  has the rounded semicircular shape, and accordingly, the first protrusion portion  330  has the line contact with the second body  200  to allow the frictional force therebetween to be small, so that the first protrusion portion  330  does not turn over when the second body  200  moves downward. 
     The first top extension portion  322  of the first extension portion  320  comes into close contact with the support protrusion  340  by means of the pressurization of the second body  200 , and in this case, a point of the first top extension portion  322  coming into close contact with the support protrusion  340  is defined as a first pressurization point P 2 . If the first pressurization point P 2  is pressurized against the support protrusion  340 , it becomes concave inward from the first extension portion  320  by means of the pressurization of the support protrusion  340 . In this state, if the second body  200  moves downward, the downward pressure is applied to the top end periphery of the first extension portion  320  coming into close contact with the second body  200 , but since the first pressurization point P 2  is supported against the support protrusion  340 , the top end periphery of the first extension portion  320  is firmly supported, without any downward deformation. More specifically, a first length d 1  from the support axis P 1  located on the bottom end periphery of the first extension portion  320  to the top end periphery of the first protrusion portion  330  is longer than a second length d 2  from the first pressurization point P 2  to the top end periphery of the first protrusion portion  330 . Further, since the first pressurization point P 2  is pressurized against the support protrusion  340 , a rotary axis used to allow the first extension portion  320  to turn over is changed to the first pressurization point P 2 , not to the support axis P 1 . Like this, in a state where the rotary axis of the first extension portion  320  is changed to the first pressurization point P 2 , structurally, only the corresponding portion to the second length d 2  of the first extension portion  320  can rotate. However, the corresponding portion to the second length d 2  is too short to rotate, and the shorter the length is, the larger the elastic deformation is, so that the first extension portion  320  can be prevented from turning over. 
       FIG.  9    is a sectional view showing another state where the first packing is pressurized against the second body moving downward in the packing structure according to the first embodiment of the present invention. 
     Referring to  FIGS.  8  and  9   , the support protrusion  340  as shown in  FIG.  9    is formed higher than the support protrusion  340  as shown in  FIG.  8   , and a point of the first top extension portion  322  coming into close contact with the support protrusion  340 , that is, a second pressurization point P 3  is located higher than the first pressurization point P 2  as shown in  FIG.  8   . Accordingly, a third length d 3  from the second pressurization point P 3  to the top end periphery of the first protrusion portion  330  is shorter than the second length d 2 . In this case, the portion corresponding to the third length d 3  is too short to rotate the first extension portion  320 , so that as the support protrusion  340  is formed higher on the outer periphery of the first tight contact portion  310 , the first extension portion  320  cannot turn over at all. 
       FIG.  10    is a sectional view showing another example of the first protrusion portion protruding from the first packing of the packing structure according to the first embodiment of the present invention. 
     Referring to  FIG.  10   , the edge periphery of a first protrusion portion  332  is angled. If the second body  200  moves downward in a state where the first body  100  is inserted into the second body  200 , accordingly, the edge periphery of the first protrusion portion  332  has line contact with the second body  200  to allow the frictional force therebetween to be small, so that the first protrusion portion  330  does not turn over when the second body  200  moves downward. 
       FIG.  11    is a sectional view showing an auxiliary contact protrusion protruding from the first packing of the packing structure according to the first embodiment of the present invention. 
     Referring to  FIG.  11   , the first packing  300  is made by injecting resin into a mold through typical injection molding, and in the process of the injection molding, a scrab portion  352  unnecessarily protrudes from the first tight contact portion  310  of the first packing  300 . Even in a process of other molding like press molding, the scrab portion  352  unnecessarily protrudes from the first tight contact portion  310  of the first packing  300 . As the scrab portion  352  is irregularly formed, a gap may be formed between the first tight contact portion  310  and the first body  100 . 
     According to the present invention, an auxiliary contact protrusion  350  protrudes from the upper inner periphery of the first tight contact portion  310  in such a manner as to have a length longer than a protruding length of the scrab portion  352 . If the first tight contact portion  310  is inserted into the concave portion  110 , accordingly, the auxiliary contact protrusion  350  uniformly protruding, not the scrab portion  352  irregularly protruding, comes into tight contact with the concave portion  110 , so that a gap between the inner periphery of the first tight contact portion  310  and the concave portion  110  can be tightly sealed. 
     Further, the auxiliary contact protrusion  350  enables the inner periphery of the first tight contact portion  310  and the concave portion  110  to be separated from each other by the protruding length thereof, irrespective of the scrab portion  352 . As a result, the upper inner periphery of the first tight contact portion  310  is elastically bent, and through the reaction to the elastic bending, an elastic pressure is applied from the lower inner periphery of the first tight contact portion  310  to the concave portion  110 . Like this, if so, the gap between the inner periphery of the first tight contact portion  310  and the concave portion  110  can be tightly sealed. 
     On the other hand, as the auxiliary contact protrusion  350  protruding from the upper inner periphery of the first tight contact portion  310  becomes close to the top inner periphery of the first tight contact portion  310 , that is, as the auxiliary contact protrusion  350  is formed higher on the inner periphery of the first tight contact portion  310 , the first tight contact portion  310  is located stably in the concave portion  110 , without any movement, so that if the auxiliary contact protrusion  350  is formed higher on the first tight contact portion  310 , the gap between the inner periphery of the first tight contact portion  310  and the concave portion  110  can be more tightly sealed. 
       FIG.  12    is a perspective view showing another example of the first packing of the packing structure according to the first embodiment of the present invention, and  FIG.  13    is a sectional view showing yet another example of the first packing of the packing structure according to the first embodiment of the present invention. 
     Referring to  FIGS.  12  and  13   , the first packing  300  has a plurality of first extension portions  320  protruding from the outer periphery of the first tight contact portion  310 , for example, has a pair of first extension portions  320  protruding therefrom in parallel to each other. First protrusion portions  332  protrude from the respective first extension portions  320 , and support protrusions  340  protrude from the first tight contact portion  310  in such a manner as to face the respective first extension portions  320 . In this case, the end periphery of each support protrusion  340  is angled to a right angle, not rounded. 
     According to the present invention, like this, the plurality of first extension portions  320 , the first protrusion portions  332 , and the support protrusions  340  are provided, so that the gap between the first body  100  and the second body  200  can be more tightly sealed. 
       FIG.  14    is a sectional view showing still another example of the first packing of the packing structure according to the first embodiment of the present invention, and  FIG.  15    is a sectional view showing a state where the first packing is pressurized against the second body in the packing structure according to the first embodiment of the present invention. 
     Referring to  FIGS.  14  and  15   , the first packing  300  includes the first close contact portion  310 , the first extension portion  320 , the first protrusion portion  330 , the support protrusion  340 , a connection portion  326 , and an auxiliary protrusion  360 . Since the first packing  300  including the first close contact portion  310 , the first extension portion  320 , the first protrusion portion  330 , and the support protrusion  340  have been already explained, and accordingly, an explanation of the connection portion  326  and the auxiliary protrusion  360  will be given below. 
     The connection portion  326  vertically protrudes unitarily from the lower periphery of the first tight contact portion  310 . The lower side periphery of the first extension portion  320  is connected unitarily to the outer periphery of the connection portion  326 . The auxiliary protrusion  360  protrudes from the outer periphery of the first extension portion  320  that does not face the first tight contact portion  310 . The auxiliary protrusion  360  has a triangular section shape so that it has sharp end periphery, but according to the present invention, of course, the auxiliary protrusion  360  is not limited thereto. In some cases, the auxiliary protrusion  360  may have various section shapes like a polygonal or circular section shape. 
     If the second body  200  moves upward in a state where the first body  100  is inserted into the second body  200 , the first protrusion portion  330  comes into close contact with the second body  200  and is elastically deformed toward the first body  100 . In this case, the inner periphery of the first extension portion  320  comes into contact with the support protrusion  340 , and accordingly, the gap between the inner periphery of the first extension portion  320  and the support protrusion  340  is kept tight. Further, if the first extension portion  320  is elastically deformed toward the first tight contact portion  310  by means of the pressure applied from the inner periphery of the second body  200  to the auxiliary protrusion  360 , the auxiliary protrusion  360  comes into tight contact with the inner periphery of the second body  200 . Furthermore, if the first protrusion portion  330  is elastically deformed toward the first tight contact portion  310  by means of the pressure applied from the inner periphery of the second body  200  coming into contact with the first protrusion portion  330  to the first protrusion portion  330 , the end periphery of the first protrusion portion  330  comes into tight contact with the inner periphery of the second body  200 . In this case, a thickness of the first protrusion portion  330  is larger than that of the first extension portion  320 , and accordingly, the first protrusion portion  330  has a stronger elastic force than the first extension portion  320 , so that even if time passes, the end periphery of the first protrusion portion  330  can be maintained to a state of coming into close contact with the inner periphery of the second body  200  for a long time. 
     According to the present invention, like this, the auxiliary protrusion  360  and the first protrusion portion  330  come into tight contact with the inner periphery of the second body  200 , so that the gap between the second body  200  and the first extension portion  320  can come into tight contact with each other, doubly, by means of the auxiliary protrusion  360  and the first protrusion portion  330 . Further, as the support protrusion  340  is formed between the auxiliary protrusion  360  and the first protrusion portion  330 , it can firmly support the auxiliary protrusion  360  and the first protrusion portion  330  against the second body  200 . 
       FIGS.  16 A and  16 B  are sectional views showing other examples of the first packing of the packing structure according to the first embodiment of the present invention, and  FIG.  17    is a sectional view showing a state where the first packing is pressurized against the second body in the packing structure according to the first embodiment of the present invention. 
     Referring first to  FIGS.  16 A and  16 B , a thickness t 1  of the connection portion  326  of the first packing  300  as shown in  FIG.  16 A  is larger than a thickness t 2  of a connection portion  327  of the first packing  300  as shown in  FIG.  16 B . If the thickness t 2  of the connection portion  327  of the first packing  300  is relatively small, like this, a thickness of a first extension portion  321  connected unitarily to the connection portion  327  becomes also small, and accordingly, the strength of the first extension portion  321  becomes low, so that the first extension portion  321  may be elastically deformed in shape easily. 
     Referring next to  FIG.  17   , if the second body  200  moves upward in a state where the first body  100  is inserted into the second body  200 , the first extension portion  321  is elastically deformed toward the first tight contact portion  310  by means of the pressure applied to the auxiliary protrusion  360  from the inner periphery of the second body  200  coming into contact with the auxiliary protrusion  360 . In this case, since the thickness of the first extension portion  321  is relatively small, the lower periphery of the first extension portion  321  along which the auxiliary protrusion  360  is formed is elastically deformed and is thus bent toward the gap between the connection portion  327  and the support protrusion  340 . In this case, a force of returning to a state of being bent, that is, to the second body  200  is applied to the first extension portion  321  by means of its elastic force, so that the auxiliary protrusion  360  connected to the first extension portion  321  can come into contact with the second body  200  more tightly. 
       FIG.  18    is a schematic perspective view showing a packing structure according to a second embodiment of the present invention, and  FIG.  19    is a schematic sectional view showing the packing structure according to the second embodiment of the present invention. 
     Referring to  FIGS.  18  and  19   , a packing structure according to a second embodiment of the present invention includes s second packing  400  disposed between a first body  100  and a second body  200 . 
     The first body  100  and the second body  200  are configured in the same structure as in the first embodiment of the present invention. The second packing  400  includes a second tight contact portion  410 , a second extension portion  420 , a second protrusion portion  430 , a contact portion  440 , and a second auxiliary contact protrusion  450 . The second tight contact portion  410 , the second extension portion  420 , the second protrusion portion  430 , and the second auxiliary contact protrusion  450  are the same as or similar to the first tight contact portion  310 , the first extension portion  320 , the first protrusion portion  330 , and the first auxiliary contact protrusion  350 , and a detailed explanation of them will be avoided. 
     The contact portion  440  protrudes bendedly upward from the end periphery of the second protrusion portion  430 . The contact portion  440  becomes inclined as it is distant from the second protrusion portion  430 , and the edge periphery between the second protrusion portion  430  and the contact portion  440  is angled or rounded. 
     The second extension portion  420  includes a second top extension portion  422  formed inclinedly in such a manner as to allow top end periphery thereof to be connected to the second protrusion portion  430  and to allow bottom end periphery thereof to be extended toward the bottom periphery of the second tight contact portion  410  and a second underside extension portion  424  formed inclinedly on the underside of the second top extension portion  422 . The second underside extension portion  424  has an extension convex portion  424   a  protruding from the upper periphery thereof in such a manner as to be distant from the second top extension portion  422 , and accordingly, a first thickness d 4  as a gap between the top periphery of the second top extension portion  422  and the extension concave portion  424   a  is larger than a second thickness d 5  as a gap between the bottom periphery of the second top extension portion  422  and the bottom periphery of the second underside extension portion  424 . Like this, the top periphery of the second extension portion  420  is thicker than the bottom periphery thereof, and accordingly, the strength of the elastic force of the top periphery of the second extension portion  420  can be stronger than that of the bottom periphery thereof. 
       FIG.  20    is a sectional view showing the contact portion formed on the second packing in the packing structure according to the second embodiment of the present invention. 
     Referring to  FIG.  20   , if the first body  100  is inserted into the second body  200 , the end periphery of the second protrusion portion  430  is elastically deformed upward and thus comes into tight contact with the second body  200 , and the contact portion  440  moves toward the second tight contact portion  410  and thus comes into tight contact with the second tight contact portion  410 . 
     In this case, the end periphery of the second protrusion portion  430  has line contact with the second body  200 , thereby making a frictional force therebetween small. 
     Since the contact portion  440  protrudes bendedly from the second protrusion portion  430 , further, an empty gap is formed between the second protrusion portion  430  and the contact portion  440 , and in this state, if the second body  200  pressurizes the second protrusion portion  430  toward the first body  100 , the contact portion  440  is elastically deformed in such a manner as to be distant from the second protrusion portion  430 . Through its own tension of the contact portion  440 , however, the contact portion  440  pressurizes the second tight contact portion  410  more strongly, so that the gap between the contact portion  440  and the second tight contact portion  410  can be tightly sealed. In the process where the contact portion  440  is elastically deformed toward the second tight contact portion  410 , further, additional tension occurs, and accordingly, a pressure is applied from the second protrusion portion  430  to the second body  200 , so that the gap between the second protrusion portion  430  and the second body  200  can be tightly sealed. Since a pressure is applied from the contact portion  440  to the second tight contact portion  410 , also, the gap between the second tight contact portion  410  and the first body  100  can be tightly sealed. 
     In this state, if the second body  200  moves downward, the second protrusion portion  430  does not turn over arbitrarily in a downward direction because the frictional force between the second body  200  and the second protrusion portion  430  is small. Since the top periphery of the second extension portion  420  is thicker than the bottom periphery thereof, further, the elastic strength of the top periphery of the second extension portion  420  becomes stronger than that of the bottom periphery thereof, so that the second protrusion portion  430  does not turn over arbitrarily in the downward direction by means of the strong elastic strength of the second extension portion  420 . 
       FIG.  21    is a perspective view showing another example of the second packing in the packing structure according to the second embodiment of the present invention, and  FIG.  22    is a sectional view showing yet another example of the second packing in the packing structure according to the second embodiment of the present invention. 
     Referring to  FIGS.  21  and  22   , the second packing  400  has a plurality of second extension portions  420  protruding from the outer periphery of the second tight contact portion  410 , for example, has a pair of second extension portions  420  protruding therefrom in parallel to each other. Second protrusion portions  430  and contact portions  440  protrude from the respective second extension portions  420 . According to the present invention, like this, the plurality of second extension portions  420 , the second protrusion portions  430 , and the contact portions  440  are provided, so that the gap between the first body  100  and the second body  200  can be more tightly sealed. 
       FIG.  23    is a perspective view showing a first body and a second body to which the packing structure according to the first embodiment of the present invention is applied,  FIG.  24    is a sectional view showing the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied, and  FIG.  25    is a sectional view showing a state where the first body and the second body, to which the packing structure according to the first embodiment of the present invention is applied, are coupled to each other. 
     Referring to  FIGS.  23  to  25   , for example, a first body  101  and a second body  201  serve as a cover like a case for smartphones, and various parts, articles, or the like may be located in the gap between the first body  101  and the second body  201 . The inner edges of the first body  101  facing the second body  201  come into close contact with the inner edges of the second body  201  facing the first body  101 , so that the first body  101  and the second body  201  are coupled to each other. In this case, the first packing  300  is provided between the inner edges of the first body  101  and the inner edges of the second body  201  to allow the gap between the first body  101  and the second body  201  to be tightly sealed. To do this, a first edge portion  101   a  protrudes from the inner edges of the first body  101 , and a concave portion  111  is formed along the first edge portion  101   a . The second body  201  has the shape of a flat plate, but according to the present invention, the second body  201  is not limited thereto. Also, in some cases, the first edge portion  101   a  and the concave portion  111  may be formed on the second body  201 , not on the first body  101 . The first tight contact portion  310  comes into close contact with the concave portion  111 . In this case, a fitting concave portion  111   a  is formed on one side or both sides of the concave portion  111 , and the longitudinal end portion of the first tight contact portion  310  is extended and fitted to the fitting concave portion  111   a.    
     Like this, since the end portion of the first tight contact portion  310  is fitted to the fitting concave portion  111   a , the first tight contact portion  310  can be firmly coupled to the concave portion  111 , without any escape from the concave portion  111 . If the inner edges of the second body  201  are coupled to the first edge portion  101   a  of the first body  101 , further, the first protrusion portion  332  comes into close contact with the inside of the second body  201  in such a manner as to be elastically deformed toward the first body  101  to pressurize the first tight contact portion  310  toward the first body  101 , so that the gap between the first tight contact portion  310  and the concave portion  111  can be tightly sealed. Further, since the support protrusion  340  pressurizes the first extension portion  320  toward the second body  201 , the gap between the first protrusion portion  332  connected to the first extension portion  320  and the second body  201  can be tightly sealed. 
     The specific structure of the first packing  300  has been already explained above, and accordingly, the explanation of the first packing  300  will be avoided below. Instead of the first packing  300 , in some cases, the second packing  400  (See  FIG.  18   ) may be located between the first body  101  and the second body  201 . Further, the first body  101  and the second body  201  have the flat rectangular sectional shapes, but in some cases, they may have various section shapes like circular, oval, and polygonal section shapes. 
       FIG.  26    is a perspective view showing other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
     Referring to  FIG.  26   , a second body  202  has a second edge portion  212  protruding from the inner edges thereof toward the first edge portion  101   a  of the first body  101  in such a manner as to be longer than the first edge portion  101   a . As a result, a relatively large gap is formed between the second body  202  and the second edge portion  212 . Further, the first packing  300  is located in the concave portion  111  of the first body  101 , and next, the first packing  300  is pressurized against the second edge portion  212  of the second body  202 , so that a gap between the first body  101  and the second body  202  can be tightly sealed. 
       FIG.  27    is a perspective view showing yet other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
     Referring to  FIG.  27   , a second body  203  is defined as the second edge portion  212  of  FIG.  26   , and the second body  203  protrudes from the first edge portion  101   a  in such a manner as to be spaced apart from the first edge portion  101   a  of the first body  101 . Further, the first packing  300  is located in the concave portion  111  of the first body  101 , and next, the first packing  300  is pressurized against the second body  203 , so that a gap between the first body  101  and the second body  203  can be tightly sealed. 
       FIG.  28    is a perspective view showing still other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied,  FIG.  29    is a sectional view showing other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied, and  FIG.  30    is a sectional view showing a state where the first body and the second body, to which the packing structure according to the first embodiment of the present invention is applied, are coupled to each other. 
     Referring to  FIGS.  28  to  30   , first bodies  102 - 1  and  102 - 2  have the shape of a pair of bars facing each other, and a second body  204  is inserted slidingly into the gap between one pair of first bodies  102 - 1  and  102 - 2 . Further, one pair of first concave portions  112 - 1  and  112 - 2  are formed on the facing inner surfaces of one pair of first bodies  102 - 1  and  102 - 2 , and one pair of first packings  300  are inserted into one pair of first concave portions  112 - 1  and  112 - 2 . One pair of first packings  300  face each other in the symmetrical relation with each other in the state of being inserted into one pair of first concave portions  112 - 1  and  112 - 2  in such a manner as to allow first protrusion portions  332  of one pair of first packings  300  to face each other. 
     If the second body  204  is inserted slidingly into the gap between one pair of first bodies  102 - 1  and  102 - 2 , further, the gap between one first body  101 - 1  and one side of the second body  204  is tightly sealed by means of one first packing  300 , and the gap between the other first body  101 - 2  and the other side of the second body  204  is tightly sealed by means of the other first packing  300 . 
       FIG.  31    is a sectional view showing still other examples of the first body and the second body to which the packing structure according to the first embodiment of the present invention is applied. 
     Referring to  FIG.  31   , one pair of first bodies  102 - 1  and  102 - 2  and the second body  204  are similar to those as shown in  FIGS.  28  to  30   , but one pair of first bodies  102 - 1  and  102 - 2  face each other in such a manner as to be somewhat misaligned with each other. Further, the first protrusion portions  332  of one pair of first packings  300  are misaligned with each other according to the arrangements of one pair of first bodies  102 - 1  and  102 - 2 . 
     While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.