| 摘要 |
<p>A door latch has a latch bolt for being pivotally mounted on a door for 90 DEG angular movement between latched and unlatched positions, a retractable stop member pivotally mounted on the door and being spring biased for being engaged by the latch bolt for blocking the same in its unlatched position while the door is open. Upon closure of the door, the stop member engages an abutment adapted to be fixedly mounted on a doorframe and is thereby pivoted to a retracted position against the bias of the spring, so that the latch bolt is free to be moved between the latched and the unlatched positions only when the door is closed.</p> |
