| 摘要 |
PROBLEM TO BE SOLVED: To provide a hinge cap capable of preventing careless opening of a lid by suppressing increase in air pressure within a cap due to warming by making the inside of the cap into a negative pressure state during capping and capable of securely preventing intrusion of water to the inside of the cap.SOLUTION: A lid engagement part of a cap body has an annular top part at the upper end and an annular swelling part protruded to the outer peripheral surface and an outer peripheral sealing surface above the annular swelling part are formed, a diametrically contractive protrusive line which projects to the inside at the lower part and engages with the annular swelling part to form a first sealing part and a diametrically contractive sub-protrusive line which engages with the outer peripheral sealing surface to form a second sealing part at the upper part apart from the diametrically contractive protrusive line are provided on an inner peripheral surface of an outer cylindrical wall of an upper lid, and a step part is provided further above the diametrically contractive sub-protrusive line, the step part having an inclined rib abutting on the top of the lid engagement part formed in protrusion toward the radial direction. |
