| 摘要 |
A safety lock with two ventilation positions for reversible hinges in windows, doors or traps is disclosed. The reversible hinge (3) comprises a frame hinge arm (8) with two steering arms (6, 7) attached on the ends, and with both steering arms (6, 7) connected to an outer arm (4) carrying the sash (1). The child safety lock comprises a revolving part (9) mounted on a pivot (5) on the frame hinge arm (8), whereon its movement is restricted by a cylindrical peg (10), and a fixed part (11) mounted on the lower steering arm (7) and provided with two serially arranged recesses (18, 19) for engagement with the blade-shaped locking head (14) of the revolving part (11). When the hinge is closed, the impact of a steering peg (24) on the sliding plane (41) ensures that the locking head (14) assumes an initial position whence it will engage with the first recess (18) when the reversible hinge (3) is opened. |
