(57) The fixed surround frame (1) of the window carries a bottom locating element (13)
slidably adjustable in relation to a bottom locking element (11) and affording a first
vertical stop (15) positioned to engage a relative catch (11a), whilst the sash (2)
carries a top locating element (17) embodied in two distinct component parts (17a,
17b), the first of which a base affording a pair of mutually opposed second vertical
stops (19) at one end, positioned to engage the catch (10a) of a top stay rod (12),
and a seating (20) at the other end; the second component (17b) affords a pair of
mutually opposed third stops (21) positioned likewise to engage the catch (10a) and
is insertable to an exact fit in the first in two different positions, 180° apart,
in such a manner as to alter the distance between the two pairs of stops (19, 21)
and thus select a different sequence of interaction between the stops and the catch
(10a).
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