Patent ID: 7575036
Filing Date: 2009-08-18
Classification: E06B

Abstract:
1. A pulling cord winder and a Venetian blind, the pulling cord winder being installed at the bottom of a lower rail of the Venetian blind and storing pulling cords separately disposed on opposing sides of said Venetian blind, comprising: an upper and a lower corresponding base, being engaged with each other; two spring coil wheels each having one of said cords windable thereon and each mounted onto a fixed cam and in a chamber at the center of said lower base; a spring, being disposed in each of said spring coil wheels and one end section of each spring being hooked to a respective spring coil wheel; a brake member, being held between said two spring coil wheels and hooked by a drawspring; and a push rod, passing through said drawspring and contacting said brake member said pushrod may be pressed to release said brake member and released to apply said brake member; so that when said push rod is released, the resilience of said drawspring pulls an arc-shaped pressing boards disposed respectively on opposing sides of said brake member, each pressing board compressing against a respective spring coil wheels so as to frictionally brake said two spring coil wheels and control said two springs to fix said Venetian blind in position; and said pushrod may be pressed to release said brake member from frictional contact with said spring coiling wheel so that said spring coil wheels are positioned to rotate to allow movement of said Venetian blind, wherein said lower base has an identical shape with said upper base, and said lower base includes said fixed cams disposed in said chamber in the middle of said lower base with each cam including a latch groove that receives an opposing end section of respective ones of said springs, a protruded rod having a second latch groove disposed on a lateral side in the middle of said two fixed cams, two arc blocking walls disposed on respective external sides of said two fixed cams, a pair of fastening rods having a screw hole and disposed on each end of said lower base, such that second cams are installed respectively in a middle position between a pair of said fastening rods on each end of said lower base, an arc groove and a recessed groove respectively disposed at the front and rear ends of said lower base and a perforation separately disposed on both end of said lower base, and a latch member having a perforation for holding an end of said drawspring and being disposed on an internal side of a sunken surface of said arc groove.