| 摘要 |
A three point lock for sliding patio doors or the like wherein a rotary hub 1 is located in a slimline casing C and has a latch 2 connected thereto and head and sill bolts 7 and 8 pivotally connected thereto at 6 and 5 so that upon rotation of the hub 1 the latch 2 is rocked between unlocked and locking position and the bolts 7 and 8 are moved from unlocked to extended locking positions and vice versa. The latch is of the hook type. The lock is deadlocked by means of a cylinder-operated locking slide 10 slidably mounted within the casing C for movement from an unlocked position to a deadlocked position in which a slot 27 therein engages with a pin 5 connecting one of the bolts 8 to the hub 1, thus preventing rotation of the hub 1. A spring 23 is provided to bias the locking slide 10 to its locking and unlocked positions. The hook bolt 2 has a ceramic strip 11, resistant to hacksaw attack, embedded in the centre one of three steel laminates. <IMAGE> |
