(57) A key-operated lock assembly for emergency actuation of the button (2) of a handle
for doors of trucks, trailers or the like, in which the actuation key can be extracted
in three positions which lie at 90 degrees to each other and comprises: an outer ring,
which is fitted so that it can rotate coaxially with the plug of the key-operated
lock in the casing of the handle proximate to the handle locking button, the ring
having a perimetric profile which forms a lip (8) which is suitable to block the rotation
of the button (2) and a recess which allows the rotation of the button in order to
release the handle and an arc-like slot (10) extending substantially through 90 degrees;
an electromagnet (12), in which the fixed part is rigidly coupled to the handle casing
and the moving element is connected to the outer ring by means of a transmission stem
(14); and a circular inner ring (17), which is rigidly coupled to the rotating plug
of the lock and is provided with a pin (20) which is rigidly coupled thereto, protrudes
from its surface and is suitable to enter the arc-like slot (10) of the outer ring
(7); the rotation of the plug being suitable to produce the rotation of the outer
ring if the electromagnet fails to operate, the electromagnet being able to move the
outer ring to a configuration for locking or releasing the button when the key is
extracted in an intermediate position.
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