| 摘要 |
<p>A lock for a casement window sash, door or the like has a pneumatically actuated bolt which holds the sash in its closed position. The locking device has a chamber enclosed by a fluid impervious housing supported below the bottom of the sash. A slidable piston is disposed in the chamber with a rod projecting upwardly therefrom and against the sash when it is closed. A spring biases the piston upwardly to dispose the rod against the sash. A squeeze bulb for charging air under pressure into the chamber above the piston to move it in opposition to the spring is provided in an accessible location external of the chamber and is squeezed when it is desired to move the rod from against the sash so the sash can be swung into an open position.</p> |
