Patent Number: 041561465
Section: claims

1. A structure for replacably and sealingly mounting an operating member such as a glove, bag, and filter in a wall port of a radiation shielding box, comprising: a cylindrical fixed port member sealingly secured to a wall port of said shielding box and having a threaded portion on its inner periphery, a cylindrical replacement port member sized to fit within said fixed port member and having an operating member secured thereto, and an elastic member disposed on said replacement port member and having a threaded portion on its inner periphery corresponding to said threaded portion on the fixed port member and adapted to be threadingly inserted in a compressed and deformed stated between said fixed port member and said replacement port member. 2. A structure as claimed in claim 1, wherein said elastic member is fixedly provided on said replacement port member. 3. A structure as claimed in claim 2, wherein said replacement port member is made up of a first cylindrical portion larger in outside diameter and a second cylindrical portion smaller in outside diamter, said elastic member is fixedly provided on the outer wall of said first cylindrical portion, and said operating member is connected to said second cylindrical portion. 4. A structure as claimed in claim 3, wherein the inside diameter of said first cylindrical portion on which said elastic member is fixedly provided is larger than the outside diameter of said second cylindrical portion having said operating member. 5. A structure as claimed in claim 4, wherein the axial length of said first cylindrical portion is approximately equal to the axial length of said second cylindrical portion. 6. A structure as claimed in claim 5, wherein said first cylindrical portion is provided with a pin and a pin hole on its respective end faces. 7. A structure as claimed in claim 6, wherein said operating member is mounted on the outer periphery of said second cylindrical portion. 8. A structure as claimed in claim 6, wherein said operating member is provided on the inside of said second cylindrical portion. 9. A structure as claimed in claim 6, wherein said operating member is provided on the inside of said second cylindrical portion and is made of the same material as that of said second cylindrical portion. 10. A structure as claimed in claim 2, wherein said replacement port member and said operating member are integrally formed. 11. A structure as claimed in claim 2, wherein said fixed port member has a hole therein communicating with the outside, said replacement port member is composed of a cylindrical body having a reduced outside diameter at its central portion, an operating member constituting a filter is provided inside one end portion of said cylindrical body, an operating member constituting a sealing member is integrally provided inside the other end portion of said cylindrical body, and said central portion communicates with said hole. 12. A port section structure, comprising: a cylindrical fixed port member sealingly secured to a wall of a radiation shielding box and having a threaded portion on its inner periphery, a cylindrical replacement port member sized to fit within said fixed port member and having an operating member secured thereto, an elastic member disposed on said replacement port member and having a threaded portion on its outer periphery corresponding to said threaded portion on the fixed port member and adapted to be threadingly inserted in a compressed and deformed state between said fixed port member and said replacement port member, and a concave or convex section provided in at least one end portion of said replacement port member and engageble with a convex or concave portion of a like configured replacement port member. 13. A port section structure as claimed in claim 12, wherein said concave and convex sections comprise a pin and a pin hole, respectively. 14. A structure as claimed in claim 10, wherein a concave or a convex section is provided in at least one end face of said replacement port member and is adapted to be engaged with a convex or a concave section, respectively, provided in another replacement port member which can be screwed into said fixed port member. 15. A structure as claimed in claim 10, wherein said operating member comprises a bottom section of said cylindrical replacement port member.