| 摘要 |
The spring hinge is formed of two elements, one steady (1) and the other rotating (2) about a rod (6) which keeps them united, and at least four springs (10) which push eight steel balls (11) against two plates (12), having also them at least four holes (13) slightly smaller than steel balls (11). A spring (18), which ends are blocked in holes (16 and 17), realised respectively one in member (8) and the other in plate (12), makes easy the way back of the hinge in the initial position.
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