| 摘要 |
<p>8591-SL-VD A latch bolt operating mechanism includes a thumbturn, a barrel cam, a shaft for coupling the thumbturn to the barrel cam to cause rotation of the barrel cam in response to movement of the thumbturn, a follower for the barrel cam and apparatus attaching the follower to the latch bolt to cause the latch bolt to move in response to actuation of the barrel cam. The illustrative barrel cam includes two generally diametrically opposed cam lobes such that rotation of the thumbturn either clockwise or counterclockwise retracts the latch bolt. The follower includes a bar which lies against the cam surface of the barrel cam, and the latch bolt moving apparatus includes an actuator arm which is pivotally mounted adjacent one of its ends, the. follower pin being mounted intermediate the actuator arm ends, the follower pin being supported adjacent the barrel cam, and the actuator arm further including a roller retractor actuator adjacent its other end.</p> |
