| 摘要 |
In order to provide a closure-fixing structure for an inflation,that allows using a filter having low strength and rigidity, which can also be applied to a casing and a closure made of various materials, and is capable of obtaining sufficient airtightness between the closure and the casing without mounting an O-ring on the outer periphery of the closure, a projecting portion (42) that projects from the inner peripheral surface of the casing (40) is formed in the position a predetermined distance apart from the end of the casing (40). The projecting portion (42) is formed as a projecting rib around the periphery of the casing (40). <??>The closure (50) is inserted into the casing (40) before the edge (44) is bent, and is retained by the projecting portion (42). The edge (44) is bent to the inside of the casing (40), that is, toward the center of the diameter by pressing to hold down the closure (50). The closure (50) is sandwiched and fixed by the projecting portion (42) and the edge (44). The closure (50) is subjected to a coining process whereby the closure (50) is intensely pressurized by a coining die (60) and a fixing die (62). <IMAGE> |
