| 摘要 |
The block has hook sections (3) disposed on the vertical face (2) of each leaf (1). A locking release strut (5) cooperates with the hooks and extends over the width of the opening. The hook, sections can be flat and of triangular form. the strut can be C-shaped with openings (7) corresponding to the hooks. the strut has, at each end, a guide plate (8,9), one of which has a spring to displace the bar between lock and release positions.
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