Plugging member and container

Abstract

In each of radial grooves 52 which are formed on a sealing disc portion 34 of a packing 10 , low strength portions 64 are formed within a predetermined range from the center of the sealing disc portion 34 by decreasing the thickness of each of thin portions 62 by deeply cutting each of the radial grooves 52 . When the center of the sealing disc portion 34 is pressed by the pressing means, splits are formed at the low strength portions 64 , and extend to curved grooves 54 and circumferential grooves 56 . As a result, it is possible to obtain a plugging member in which a draining port can be opened wide with a small amount of pressing force.

What is claimed is:  
     
         1 . A plugging member which plugs a draining port for draining a material which is contained in a container, comprising: 
 a plugging plate body which is mounted in said draining port and is able to plug said draining port; and    a thin portion which is formed by decreasing the thickness of said plugging plate body in portions in the thickness direction thereof, using a concave portion which is formed linearly on one end surface of said plugging plate body in the thickness direction thereof and which is formed with a predetermined width or with a width which decreases from said one end surface to the other end surface of said plugging plate body in the thickness direction thereof,    wherein the thinnest portion of said thin portion has the thickness T2 which ranges from not less than 0.05 mm to not more than 0.7 mm,    the surfaces which face each other and form said concave portion are in parallel with each other, or the angle θ which is formed by said facing surfaces is more than 0° and equal to or less than 120°, and the ratio (L/T2) of the thickness L of said plugging plate body to said thickness T2 is equal to or more than 2.    
     
     
         2 . A plugging member according to  claim 1 , wherein a low strength portion is formed at said thin portion by decreasing the strength of said thin portion within a predetermined range from the center of said plugging plate body.  
     
     
         3 . A plugging member according to  claim 1 , wherein three or more of said thin portions are formed, and a portion of these thin portions are low strength portions whose strength is made lower than the other thin portions.  
     
     
         4 . A plugging member according to  claim 1 , wherein said plugging plate body is formed in a disc plate shape whose outer diameter R is not less than 0.5 cm and not more than 5 cm.  
     
     
         5 . A container in which a draining port for draining a material which is contained therein and said draining port is plugged by said plugging member according to  claim 1 .  
     
     
         6 . A plugging member according to  claim 2 , wherein said plugging plate body is formed in a disc plate shape whose outer diameter R is not less than 0.5 cm and not more than 5 cm.  
     
     
         7 . A container in which a draining port for draining a material which is contained in said container is formed, and said draining port is plugged by said plugging member according to  claim 6 .  
     
     
         8 . A container according to  claim 7 , wherein said container is used for the purpose of containing therein photographic processing chemicals.  
     
     
         9 . A plugging member according to  claim 3 , wherein a high strength portion is formed at said thin portions by increasing the strength of the thin portions outside of a predetermined range from the center of said plugging plate body.  
     
     
         10 . A plugging member according to  claim 2 , wherein said plugging plate body is formed in a disc plate shape whose outer diameter R is not less than 0.5 cm and not more than 5 cm.  
     
     
         11 . A plugging member according to  claim 9 , wherein said plugging plate body is formed in a disc plate shape whose outer diameter R is not less than 0.5 cm and not more than 5 cm.  
     
     
         12 . A container in which a draining port for draining a material which is contained in said container is formed, and said draining port is plugged by said plugging member according to  claim 9 .  
     
     
         13 . A container according to  claim 12 , wherein said container is used for the purpose of containing therein photographic processing chemicals.  
     
     
         14 . A container according to  claim 5 , wherein said container is used for the purpose of containing therein photographic processing chemicals.  
     
     
         15 . A plugging member which plugs a draining port for draining a material which is contained in a container, comprising: 
 a plugging plate body which is mounted in said draining port and is able to plug the draining port; and    a low strength portion which is formed on said plugging plate body where the strength of said plugging plate body is decreased by a plurality of radial portions which are formed radiating out from substantially the central portion of said plugging plate body toward the external edge thereof, a plurality of curved portions which are formed so as to be curved in an arcuate shape and continue from the tip end of each of said radial portions, and a plurality of circumferential portions which are formed so as to extend from the tip end of each of said curved portions in the direction along the edge of the opening of said draining port.    
     
     
         16 . A plugging member according to  claim 15 , wherein said low strength portion is a groove which is formed by decreasing the thickness of said plugging plate body thinner in portions.  
     
     
         17 . A plugging member according to  claim 15 , wherein a container in which a draining port for draining a material contained therein is formed, and said draining port is plugged by said plugging member.  
     
     
         18 . A plugging member according to  claim 16 , wherein a container in which a draining port for draining a material contained therein is formed, and said draining port is plugged by said plugging member.  
     
     
         19 . A container according to  claim 17 , wherein said material is photographic processing chemicals.  
     
     
         20 . A container according to  claim 18 , wherein said material is photographic processing chemicals.