| 摘要 |
A binder of the ring type includes fixed and pivot rods with their free ends being bent in opposite relation. The pivot rods are attached to a pivot plate. The pivot plate is mounted on a bottom plate in such a manner that it is always biased by a spring in its opening direction. A pivot arm is provided, including an upper member and a lower member formed by bending a metal material. The pivot and bottom plate are clamped between the upper and lower members. To prevent excessive pivot movement of the pivotal arm, a stopper means is provided at the extremity of the pivot end of the pivot arm.
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