| 摘要 |
<p>A turn-tilt window 1 has a glazed sash 3 mounted on a fixed frame 2 for opening movement about either a horizontal axis (tilt) through pivots 7,8 or about a vertical axis (turn) through pivots 7,9 and a drive mechanism 10 operable by a control handle 5 to select the combination of pivots 7,8 and 9 for operation in the tilt or turn modes. The drive mechanism 10 is mounted for sliding movement around the peripheral edge of the sash 3 on rotation of the control handle 5 and a safety device 6 mounted on the sash 3 permits sliding movement of the drive mechanism 10 on rotation of the control handle 5 to a first operative position in which pivots 7,8 are selected for operation in the tilt mode but prevents sliding movement of the drive mechanism 10 and rotation of the control handle 5 to a second operative position in which the pivots 7,9 are selected for operation in the turn mode until the safety device 6 has been manually released.</p> |
