(57) 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.
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