(57) A front-coupling safety lock for sliding doors, of the type that comprises a hook
element (4) that is pivoted inside a casing (2) of the lock (1) and is suitable to
rotate about the pivot (3) until it protrudes partially from the casing (2), engaging
within a respective selvage mounted on the jamb. The hook (4) is constituted by an
angular lever (4) that is pivoted to the casing (2) at one of its ends, with a tab
(7) that protrudes laterally to the side of the pivoting point to which the end of
a frame (8) is pivoted, the frame being suitable to perform an axial translational
motion by way of the action of a key-operated cylinder (24), the frame (8) being associated
with a lever (15) provided with an end tooth (16) that is suitable to engage, by way
of the action of an elastic means (17), in respective seats (10a, 10b) provided on
the frame (8); a rocker (20) being mounted so that it can rotate about its own central
portion proximate to the angular lever (4) on the portion that lies opposite the portion
provided with the protruding tab (7), the rocker having an end (20a) that is suitable
to engage in a recess (23) of the angular lever (4) and an opposite end that faces
a pin (19) that can slide axially within a hole (18) provided in the casing (2) and
normally protrudes therefrom.
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