Blind with slat runners having single control - has two planetary gear clutch assemblies

摘要

The blind has runners linked together inside a guide rail and supporting spindles which support slats. The runners and spindles are linked to a single rotating control linked to a pulley by means of a cord (19) attached to the first runner and to a rod with screw threads engaged with the pinion of a spindle. The blind has two planetary gear clutch assemblies (2, 3) one between the control and the pulley and another between the control and the rod. The first assembly is in a rotating case (1) supporting the pulley whilst the second is coupled to the central pinion and joined to the rod. The number of teeth in the planetary systems is calculated so that stops are only in contact once during several turns.