| 摘要 |
A binder mechanism for record binders. The binder mechanism comprises a base plate (10) having two interspaced aligning pins (12', 12''), a pivotal arched element (18) and an actuating lever (22), which is pivotally mounted on an end shield (20) of the base plate and which acts upon a spring-supported bend (26) of the arched element. The actuating lever can be locked in a first and a second open position of a respective detent part (52, 56), which is situated on a hold-down element (28), under the action of the return spring (24) on the bend of the bearing web (14). In order to achieve a reliable locking also in the first open position (52) corresponding to a customary actuation, the width of the insertion gap (68) between aligning pins and the arched element is reduced on the pivot path of the actuating lever between both open positions while increasing the pre-tensioning of the return spring in places under the passage measure for the actuating lever.
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