| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a cap applicable to bottle mouths of a plurality of forms, and which is capable of preventing the contents from being leaked out because of the change in pressure in a bottle induced by the change in temperature, etc. <P>SOLUTION: The cap 10 includes a ceiling wall 12, outer circumferential wall 16, a first inner circumferential wall 22 and a second inner circumferential wall 26. A first protruding part 18 and a second protruding part 20 are so formed as to make a round of the inner surface of the outer circumferential wall 16. A third protruding part 24 is so formed as to make a round of the outer surface of the first inner circumferential wall 22. A fourth protruding part 28 is so formed as to make a round of the outer surface of the second inner circumferential wall 26. A fifth protruding part 30 is formed on the ceiling wall 12 protruding toward the outer circumferential side, between the outer circumferential wall 16 and the first inner circumferential wall 22. An annular groove 32 is formed on the ceiling wall 12 along the inside of the second inner circumferential wall 26. The part of the ceiling wall 12 inside the groove 32 is made thinner than the part of the ceiling wall 12 outside the groove 32. <P>COPYRIGHT: (C)2003,JPO |
