| 摘要 |
The mechanism has two relatively turnable rigid frames (7,8) and a rigid locking element (11). It also has a rigid overlocking element (25), moveable between a first active and a second lowered positions relative to the second frame. In active position, it acts with toothing (13) on the first frame to lock the frames relative to each other. In lowered position, it does not mesh with the toothing and is normally held by retention elements (30,31), which yield when the overlocking element is retracted into active position. A rigid stop element (14) on the second frame moves towards the overlocking element to press it into active position by cam action, when the mechanism is subjected to a momentum, which is above a set first level in a first direction of turning (20).
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