| 摘要 |
A tubular body sealing mechanism which can easily make a hermetic seal. A bushing is fit onto the leading end of a shaft part of the hermetic plug to be moveable in the axial direction, the ring seal member is fit to be moveable between a base part and the bushing, a small diameter region is formed on the end of the shaft part on the bushing side in the ring seal member moveable region, a large diameter region is formed on the end of the shaft part on the base part side, and when the shaft part of a hermetic plug is inserted into the injector cap from the opening end, the bushing contacts the reduced diameter region of the injector cap, the bushing moves toward the base part of the shaft part, and the ring seal member is moved by the bushing from the small diameter region to the large diameter region, such that the ring seal member deforms and expands toward the inner peripheral face of the injector cap and the ring seal member forms a press fit to the inner peripheral face of the injector cap to create a hermetic seal.
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