Patent ID: 6945302
Filing Date: 2005-09-20
Classification: E06B

Abstract:
1. A window blind control structure adapted to be installed in a window blind having a headrail and a window body suspended from said headrail, the window blind control structure comprising: a transmission mechanism mounted in said headrail of said window blind, said transmission mechanism having at least one amplitude modulation control device coupled to said window body for controlling lifting of said blind body, at least one frequency modulation control device coupled to said window body for controlling tilting of said window body, and at least one clutch coupled to said amplitude modulation control device and said frequency modulation control device for controlling synchronous action between said amplitude modulation control device and said frequency modulation control device; a linking mechanism mounted in said headrail and coupled to said transmission mechanism, said linking mechanism having an input member adapted to receive an external biasing force, and an actuating member coupled between said input member and said transmission mechanism and adapted to drive said transmission mechanism upon action of said input member; and an operation device coupled to said input member of said linking mechanism for operation by the user to bias said input member; wherein said at least one amplitude modulation control device each comprises an amplitude control wheel; said at least one clutch each comprises a holder base, said holder base having a recessed hole formed in one side thereof and adapted to accommodate the amplitude control wheel of one of said at least one amplitude modulation control device; wherein said at least one frequency modulation control device each comprises a frequency control wheel, said frequency control wheel comprising a circular through hole, which receives one amplitude control wheel of said at least one amplitude modulation control device; said at least one clutch each further comprises a limiter affixed to the holder base of the corresponding clutch and adapted to stop the corresponding frequency control wheel from falling out of the corresponding amplitude control wheel; wherein said amplitude control wheel has a longitudinal slot formed in the periphery of one end thereof inside the holder base of one of said at least one clutch; said at least one frequency modulation control device each comprises a frequency control wheel, said frequency control wheel having a groove; said at least one clutch each further comprises a spring member mounted in the slot of the amplitude control wheel and stopped at one end thereof with the slot, and a link mounted in the slot of the amplitude control wheel and supported on the other end of said spring member and engageable into the groove of the frequency control wheel of the corresponding frequency modulation control device being mounted on the corresponding amplitude control wheel for enabling the corresponding frequency control wheel to be synchronously rotated with the corresponding amplitude control wheel; and wherein said at least one clutch each further comprises a stop block affixed to one side of the corresponding holder base around the recessed hole of the corresponding holder base, said stop block having a smoothly arched notch formed in a top side thereof and fitting the periphery of the recessed hole of the corresponding holder base, and two sloping faces respectively downwardly extended from two sides of said smoothly arched notch toward the recessed hole of the corresponding holder base and adapted to force the corresponding link away from the corresponding frequency control wheel after rotation of the frequency control wheel of each of said at least one frequency modulation control device with the amplitude control wheel of each of said at least one amplitude modulation control device through a predetermined angle.