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(11) | EP 0 870 888 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | External unit for door lock |
| (57) An exterior unit (1) for controlling access via doors with a lock which can normally
only be operated from the inside, comprises a combination key cylinder (2) to prevent
or enable access from the exterior, a fixed support housing (3) in which the combination
cylinder (2) is insertable from the front (1a) of the exterior unit (1), by sliding
it longitudinally into the support housing (3), a sliding catch (4) incorporated in
the support housing (3) and co-operating in the inserted position of the cylinder
(2), with an aligned transverse cavity (5) which is provided in at least one side
of the housing of the combination cylinder (2), and into which the tip of the said
catch (4) is slideable to retain the combination cylinder (2). A spring (6) is provided
for urging the catch into its locking position. The catch (4) has, at the rear, a
conical tail (7) which is axially guided in a chamber (3a) of the support housing
(3). A radial threaded hole (8) is located in the support housing (3) and accessible
from the back (1b) of the exterior unit (1). A grub screw (9), which has a conical
tip (9a) which is complementary to the conical form of the conical tail (7) is located
in this threaded hole (8), the grub screw (9) being screwable between a first position
in which its conical tip (9a) is contained within the threaded hole (8) and a second
position in which it extends into the enclosure (3a), to slidingly engage the side
of the conical tail element (7) and maintain the catch in its combination cylinder
retaining position. |