| 摘要 |
<p>An electrically operated exit device comprises a low powered dogging assembly (250) for a pushbar (22) and an electrical actuator for a latch bolt (16). A latching bracket (254) is attached to the pushbar for movement inwardly and outwardly along a path. A dogging plate (252) of the dogging assembly is pivotally moveable between a retracted position out of the path of the latching element and an extended position in the path of the latching element. The dogging plate is spring biased (214b) toward the extended position and has a protruding shoulder (271). When the dogging plate is extended and the pushbar moved inward manually, the latching bracket strikes the dogging plate, retracts it slightly against the force of the spring bias and then continues slightly beyond the shoulder of the dogging plate. Then, the dogging plate again extends fully under the influence of the spring bias such that a bearing surface (267) on the far side of the shoulder catches the latching bracket and thereby dogs the pushbar.</p> |
