US 7,320,354 B2
Pulling cord winding apparatus for window shades
Li-Ming Cheng, No. 215, Jiouru 1st Rd., Sanmin District, Kaohsiung City (Taiwan)
Filed on Feb. 04, 2005, as Appl. No. 11/49,739.
Prior Publication US 2006/0175023 A1, Aug. 10, 2006
Int. Cl. E06B 9/30 (2006.01)
U.S. Cl. 160—170 14 Claims
OG exemplary drawing
 
1. A pulling cord winding apparatus for window shades installed on a bottom rail of a window shade to retract and extend pulling cords located on two sides of the window shade, comprising:
an upper cap and a lower seat that are coupled together;
two elastic take-up reels corresponding to holding struts located in a center housing compartment formed on the lower seat;
two elastic coils held in the elastic take-up reels having two ends latched on the elastic take-up reels;
a pair of elastic reeds on opposing sides of a post located on one side of the lower seat and each reed is connected to a respective one of two brake elements; and
a push rod located between the two brake elements to form a forced contact therewith;
wherein the push rod is depressible and retractable to move a ramming element on one end thereof to press the brake elements to allow a coarse surface formed on an outer side of the brake elements to he spaced from the two elastic take-up reels to form a braking or rotating condition and allow the two elastic coils to retract or extend to extend or retract the window shade to a selected location.