| 摘要 |
PROBLEM TO BE SOLVED: To impart a function of a multiple-thread screw even through the lead width thereof being the width of single thread screw, and strengthen clamping force by providing a plurality of screw projections with its lower surface as a screw surface on the outer circumferential surface of a male body, and also providing a plurality of projections to be screwed with its upper surface as a surface to be screwed on the inner circumferential surface of a female surface. SOLUTION: A plurality of screw projections 34 are formed on the outer circumferential surface of the cylindrical spout 18 of a vessel main body 20. The lower surface 34 of a screw projection 34 inclines in one side for forming a screw surface. A plurality of projections 42 to be screwed are provided on the inner circumferential surface of the hollow cylindrical body of a cap member. The upper surface of the projections 42 to be screwed inclines in one side for forming a surface to be screwed. When the cap member 32 is pressed down from the upside of the cylindrical spout 18, the projections 42 to be screwed passe downward through by passing between the adjacent screw projections 34 without being in collision with the screw projection 34 or after once collision when the cap member 32 is rotated in the inclining direction of the screw surface and the surface to be screwed, both of them are threaded firmly with each other. If the cap member 32 is rotated reversely to be raised upward, simple removement can be done from the vessel main body. |
