(57) The invention relates to an assembly (1) for use as an aluminium door nose (2) for
mounting on live (3) and slave door parts of a French door (5). The locking means
two spaced shoot bolts (9) and an intermediate latch (10) all operated on rotation
of the handle means which, by suitable mechanism including a bodily reciprocable shiftable
elongate member (13), is operable to both latch and lock the live (3) and slave (4)
door parts together. To that end, the elongate member (13) has spaced blind holes
(14) in the form of through apertures, which are in the lockable position aligned
with their respective associated shoot bolts (9).
The member (13) defines the through apertures (14). When the handle is turned to latch
the slave door via the latch (10), this action "throws" the elongate member.
If the latching action is properly achieved, the apertures (14) are aligned with the
associated shoot bolts (9), and the bolts (9) are then actuated to be shot and to
engage behind keepers in the French door, so locking the door parts (3,4) together.
If latching is not properly achieved, then the member (13) is not thrown far enough
to clear the bolts (9), which then are prevented from being thrown by abutment means
forming part of the rear surface of the member (13) adjacent the respective apertures.
The door parts (3,4) thus remain clearly unlocked until the latch is properly engaged,
which allows the bolts (9) to be shot and the French doors locked securely.
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