| 摘要 |
PROBLEM TO BE SOLVED: To keep the top lid satisfactory over a long period of time as regards the force with which the top lid opens and the angle to which it opens. SOLUTION: At least either a cap body 11 or a top lid 12 is fitted close to a hinge 13 with an elastomeric piece 26 which is capable of elastic deformation between the cap body and the top lid when the top lid is closed to. For this elastomeric piece the hardness is set in the range 40-70 and the compression set Cs, at a value not exceeding 15%. |
