Patent attributes
An exit device for latching a door in tornado-prone areas keeps the door closed when the door is subjected to tornado debris impact by incorporating a blocking arm that swings outward away from the door as impact energy is transferred through the door to the blocking arm in the exit device. The blocking arm prevents a pushbar actuator from moving towards the door during impact or rebound which would allow the door to open. The blocking arm is biased close to the door in a non-blocking position where it initially receives the transferred impact energy. During the impact event the blocking arm rapidly rotates on a pivot from the non-blocking position to a blocking position away from the door. After the impact event, the blocking arm returns to the non-blocking position so that the exit device operates normally.
