| 摘要 |
<p>A latch assembly comprises a bolt unit mounted in a frame member of a door or window sash, and a bolt-driving unit installed on one side of the door or window sash. The bolt unit has a latch bolt supported by a rotatable hollow shaft, the bolt being pivotable between projecting and retracted positions by rotation of the hollow shaft. The bolt driving unit includes an axially movable driver torque bar having on one end a driver that is normally held in engagement partly with the hollow shaft in driving relation and partly with fixed engaging means of the bolt driving unit against rotation of the torque bar. By pushing the driver torque bar axially toward the hollow shaft, the driver becomes shifted out of engagement with the fixed engaging means, whereupon the driver torque bar can be turned about its own axis by an operator handle in order to rotate the hollow shaft for latching and unlatching operation. The axial movement of the driver torque bar can be effected by a push button mounted in the handle coaxially with the torque bar.</p> |
