Patent ID: 8366033

Claim:
A cord winding device for a window covering, comprising: a casing; a reel rotatably mounted on the casing; a torsion spring biased between the casing and the reel; a limit ring secured on the casing and abutting the reel to limit the reel between the casing and the limit ring; and a pull cord attached a bottom of the casing; wherein the casing has an open side formed with a receiving space to receive the reel; the receiving space of the casing has a bottom wall provided with a pivot shaft; the casing has a periphery provided with a reduced mounting shoulder for mounting the limit ring; the casing has a top formed with a first slot connected to the receiving space; the limit ring is secured on the reduced mounting shoulder of the casing; the limit ring has a top formed with a second slot which is juxtaposed to the first slot of the casing and is connected to the receiving space; the limit ring has an inner portion formed with an exposing hole facing the reel to expose the reel; the reel is rotatably mounted in the receiving space of the casing; the reel includes two stop disks and a spool located between the two stop disks to form a winding space between the two stop disks and the spool; the winding space of the reel is connected to the receiving space of the casing; the winding space of the reel is connected to first slot of the casing and the second slot of the limit ring; the spool of the reel has an open side formed with a receiving chamber to receive the pivot shaft of the casing and the torsion spring; the receiving chamber of the spool has a bottom wall provided with a pivot hole rotatably mounted on the pivot shaft of the casing so that the spool of the reel is rotatable on the pivot shaft of the casing; one of the two stop disks of the reel has a periphery formed with a recessed driving portion exposed outward from the exposing hole of the limit ring; the driving portion of the reel has a bottom wall formed with a hooking hole exposed outward from the exposing hole of the limit ring; the hooking hole of the driving portion is connected to the winding space of the reel and extends through the spool into the receiving chamber of the spool.