| 摘要 |
<p>A concealed hinge (1) for doors or windows (2) constituted by a frame or case (3) with which at least one leaf (4) is rotatably associated, comprising a bridge (5) that is approximately U-shaped in plan view so as to form a base (6) from which a first arm and a second arm (7, 8) protrude which are approximately mutually parallel, each arm interacting selectively and respectively with first and second snap-acting means that are adapted to guide the opening of the leaf (4) from a closed condition to a first stable condition rotated through approximately 90°, followed by a second stable condition rotated through approximately 90° more, and vice versa.</p> |
