(57) The mechanism in question comprises a first spindle (2) supported by a prismatic
box-like body (1), and at one end thereof it receives a toothed wheel. Fitted to the
spindle (2) with the interposition of resilient biasing means, is a hollow cylindrical
element (6) having a circumferential ring of projecting teeth (7). The toothed wheel
(3) of the spindle (2) engages a cooperating toothed wheel (20) carried at the end
of a second spindle (8) which is also formed with a support hook for one of the strips
(16) of a vertical strip blind. The body (1) is housed, with the spindle (2) disposed
on one side thereof, in a sliding track provided with opposed guides for the passage
of a flexible control member, this latter being engageable with the toothed circumferential
projection (7) formed on the hollow cylindrical element which surrounds the first
spindle (1).
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