Patent ID: 7905522

Claim:
An exit device comprising: a latch; a mounting rail for mounting to an inner surface of a door; a pushbar mounted for motion relative to the mounting rail between an inward position towards the mounting rail and an outward position away from the mounting rail, the pushbar operating the latch when moved to the inward position; at least one connecting arm having a connecting arm first end pivotally mounted to the mounting rail and an opposed connecting arm second end pivotally attached to the pushbar for guiding the pushbar when the pushbar is moved between the inward and the outward positions, a first stop member extends from the at least one connecting arm second end; at least one pushbar biasing spring biasing the pushbar towards the outward position; and a blocking arm having a blocking arm first end pivotally mounted to the mounting rail, an arm body and an opposite blocking arm second end, a second stop member extends from the blocking arm second end, the blocking arm is movable between a blocking position and a non-blocking position, the blocking arm being biased towards the non-blocking position into contact with the mounting rail and the arm body and the second blocking arm end moving outwards and away from the mounting rail into the blocking position as a result of energy transfer to the blocking arm such that the second stop member contacts the first stop member to prevent motion of the pushbar towards the mounting rail during a high-energy impact against an outer surface of the door.