Tunnel cover has lock element in form of plate movable in plane of tunnel cover that can be moved with device for opening passages in cover in its longitudinal plane to open associated passages

摘要

The device has number of passages (15) that are normally held closed by a lock element and that can be opened, especially in the event of a fire, and a device for opening the passages. The lock element is a plate (12) that is movable in the plane of the tunnel cover that can be moved with the device for opening the passages in its longitudinal plane to open the associated passages.