| 摘要 |
A tube coupling which allows a fluid tube to be easily connected to and disconnected therefrom includes a cylindrical coupling body, a chuck disposed in the coupling body and having engaging portions on its distal end for gripping a fluid tube inserted in the coupling body, a guide member for holding the chuck therein for sliding movement in a predetermined axial stroke, the guide member having cylindrical slanted inner surfaces in substantial alignment with a proximal portion of the engaging portions of the chuck, a release bushing disposed in the coupling body for insertion between the fluid tube inserted in the coupling body and the chuck for spreading the engaging portion out of gripping engagement with the fluid tube, a gasket disposed in the coupling body for sealing a distal end of the fluid tube with respect to an inner wall of the coupling body. The chuck has bulging portions projecting radially outwardly from the proximal portions of the engaging portions. When the bulging portions are drawn into the guide member, the bulging portions are slidingly engaged and pushed by the slanted inner surfaces, causing the engaging portions of the chuck to be displaced radially inwardly into gripping engagement with the fluid tube. The axial stroke which the chuck is slidable is limited by the guide member to a range in which the engaging portions are kept out of contact with the gasket.
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