| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the force in opening/closing a cap in which an opening part of a vessel body is closed. <P>SOLUTION: A male screw part is formed on an outer circumferential surface of the opening part 2 of the vessel body 1, a female screw part to be screwed to the male screw part is formed in an inner circumferential part of a cap body 21 of the cap 20 to be screw-closed to the opening part 2 of the vessel body 1, irregularities 22 are formed on the outer circumferential surface of the cap body 21, and one or a plurality of projecting parts 23 projected in the horizontal direction are provided as an opening/closing force reducing means. By turning the cap 20 in the circumferential direction by hooking a finger to the projecting parts 23, the radius of the point of application of the turning force by the cap 20 is increased, the turning force larger than the conventional value can be applied to the cap 20 by the principle of leverage. In other words, the cap 20 can be opened/closed by a force smaller than the conventional forces. <P>COPYRIGHT: (C)2003,JPO |
