| 摘要 |
<p>A lock (10) including magnetic (1) and mechanical (24) locking features is disclosed. The mechanical lock means (24) operates in response to an attempt to force open the lock (10). This means the magnetic lock means (1, 2) may be manufactured to be smaller and use less power as it does not have to resist the full force of unauthorised opening. The mechanical lock means includes a pin (24) and at least one locking element (27) which operates by engagement of the at least one locking element with a recess (24). When the magnetic lock means (1, 2), such as an electromagnet (1) and armature (2), is energised movement of the door in the frame (Large arrow) causes the movement of the pin (24) and the electromagnet (1) relative a sleeve (42) around the pin (24). This in turn allows locking balls (27) to enter a groove (26) in the pin and prevent further movement of the lock (10) as a whole by abutting a shoulder (41) that moves with the electromagnet (1) restricting the position of the balls (27) so they must engage the pin. This interaction prevents further movement of the door. When not energised the electromagnet (1) is not attracted to the armature (2) and any movement of the door leaves it in place preventing the balls (27) from locking the pin (24) in the sleeve (42).</p> |
