Multiple lock assembly for door having three locks

摘要

A lock assembly (20) for locking and unlocking a door comprises a lock bar (94) moveable between locked and unlocked positions, three locks (70A, 70B, 70C) each of which have lock arms (76) moveable between locked and unlocked positions and a linkage connecting the lock arms (76) to the lock bar (94). The linkage has a first operating configuration whereby the lock bar (94) moves from its locked to its unlocked position in response to the movement of any pair of lock arms (76) from their locked to their unlocked positions. The linkage also has a second operating configuration whereby the lock bar (94) moves from its locked to its unlocked position in response to either movement by a predetermined pair of lock arms (76) from their locked to unlocked positions or the movement of the third lock arm from its locked to unlocked position.