| 摘要 |
A ring binder that comprises a superior curve sheet substantially rigid that supports a couple of inferior sheets to which at least two pairs of semi-ring members are mounted, the couple of inferior sheets which is pivotally moveable between the first position in which the semi-ring members are closed and a second position in which the semi-ring members are opened and a clamp to grip at least on of the semi-ring member pairs while closing and the clamp is supported by a superior curve sheet between the two pairs of semi-ring members. |
