Patent ID: 6874339

Claim:
An emergency release for a door lock that is to be mounted to a door, said door lock comprising: a lock unit to be mounted on the door and having a handle on each side of the door and a lock, said handle on one side of the door being associated with said lock, while said handle on the other side of the door is not associated with said lock, a latch unit having a latching bolt projectable from the door for latching the door, and retractable into the door for unlatching the door, wherein said lock, when set, prevents retraction of said latching bolt by means of rotation of said handle on the one side of the door for unlatching the door, but does not prevent retraction of said latching bolt by means of rotation of said handle on the other side of the door, a linking unit having latch retraction means connected with respect to said latch unit, and holding means for releasably holding said latch retraction means in a rest position, and a sensor unit for detecting the difference in pressure between the one side and the other side of the door and having a sensor door, wherein said sensor door is automatically opened in response to a pressure difference across the door on which the door lock is mounted above a predetermined threshold level, and is connected to said holding means to release said holding means and allow actuation of said latch retraction means when said sensor door opens, for retracting said latching bolt to allow automatic opening of the door independently of said lock unit.