(57) A cremone bolt for door and window fixtures comprises a handle (12), at least one
movable driving element (13, 14) for opening/closing the fixture and a motion-transmitting
mechanism from the handle to the driving element, said mechanism comprising a toothed
rotor (17) integral with the handle and suitable for engagement with at least one
rack (18, 19) integral with at least one driving element, the cremone bolt comprising
an external shell (15) defining a cavity (16) inside which the motion-transmitting
mechanism is housed, said cavity (16) being open on the side facing a section bar
of the fixture in use, and a cover (20) being present which can be fastened to the
shell to close the opening of the cavity (16) at least partly. The external shell
(15) is made of plastic material, the rotor and rack being made of metal, at least
one rib (40, 41) for guiding the rack (18, 19) jutting out from the cover (20) towards
the inside of said cavity (16).
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