Patent attributes
A pull cord operation mechanism for blinds includes a fixing mount having a pair of slide grooves and a pivoting groove concaved at the upper edge of left/right sidewalls and a central reinforcing plate thereon respectively for retaining left/right roller ends and a linking shaft of a control member thereby, and a base board with a rectangular through hole precisely defined by the adjacent reinforcing support plate and one sidewall thereof. The fixing mount also has a pair of C-shaped engaging slots with lower openings disposed at the reinforcing support plate and one sidewall thereof to be registered with a pivoting rod of a retaining member thereby. The control member has a pair of cord passages symmetrically disposed at one side of the left/right roller ends thereon, and a pair of limiting stop rings of larger diameters protruding at one corresponding side of the two cord passages thereof. At the other side of the right roller end thereof is disposed an annular and toothed adjusting area made up of a plurality of abutting facets and curved sliding facets, and a pull cord hole for a pull cord to be led there-through and fixed thereto. Both sides of the pivoting rod of the retaining member are respectively disposed a linking section with a retaining hook extending at the upper end thereof, and an actuation section tilting downwards in a proper angle with rectangular cord-passage holes disposed thereon. Thus, via the operation mechanism above, the pull cord is directly suspended downwards in a single line without being wound and doubled up so as to avoid the danger of strangling children by accident for the safety of the household.
