| 摘要 |
A self-opening mechanism for a cap is capable of maintaining a restoring force of an elastic member and easily and tightly locking the cap and also releasing the locking. The mechanism has an elastic member ( 4 ) that is attached to an inner side of a hinge ( 3 ), and also a stopper block ( 7 ) is provided in a direction in which the elastic member ( 4 ) deforms so that the elastic member ( 4 ) deforms to an S-shaped form. Engagement pieces ( 10, 10 a) in the cap ( 2 ) side are inserted into and fixed between hooks ( 16, 16 a) of a push piece ( 18 ) and a protruding engagement pieces ( 15, 15 a) to lock the cap more tightly. As the hook ( 16, 16 a) moves upward and moves away from the protruding engagement pieces ( 15, 15 a) when the push piece ( 18 ) is pressed, the engagement pieces ( 10, 10 a) are released and a cover ( 2 ) automatically opens due to the restoring force of the elastic member ( 4 ).
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