(57) A lock for rolling shutters, swinging doors and section doors, comprising a box (1-3),
a box covering (19), a pair of bolt actuating members (15) selectively displaceable
between withdrawn positions and extracted positions, and an operating system of toothed
wheels (10,13) intended for driving the bolt actuating members (15) under control
of a lock cylinder (26) included in a cylinder lock unit (15). According to the invention,
the cylinder lock unit (15) is connected to the lock box covering (19) by means of
at least one screw acting between the box covering (19) and the cylinder lock unit
(25); the screw is accessible by a maneuver tool through at least one corresponding
bore (7) formed in the front wall (1) of the lock box, and the lock comprises a shutter
member (11) arranged for preventing the insertion of the tool through the bore (7)
when the lock cylinder (26) is situated in any position different from a preestablished
change position, which can be attained only by rotating the lock cylinder (26) by
means of the corresponding key (28). Preferably, the shutter member (11) is formed
by a flange portion (11) of the central toothed wheel (10) of the lock operating system,
and this central toothed wheel (10) is embodied by means of a half-shear operation
from a metal plate disk whose periphery forms the flange (11).
|
|
