BLIND BODY POSITIONING MECHANISM FOR NON PULL CORD WINDOW BLIND AND WINDOW BLIND USING SAME

摘要

A window body positioning mechanism of a non pull cord window blind includes two first transmission wheels, two transmission cords respectively connected with one ends thereof to the first transmission wheels, two second transmission wheels meshed together and respectively meshed with the first transmission wheels, a coil spring connecting the two second transmission wheels and selectively wound round one second transmission wheel, and two resistance units each including a one-way pawl and a resistance wheel wound by one respective transmission cord and meshed with the one-way pawl. Thus, when extending out or receiving the blind body, the friction resistance between the resistance wheels and the transmission cords and the engagement relationship between the resistance wheels and the respective one-way pawls help achieve excellent blind body positioning effects.

主权项

1. A blind body positioning mechanism used in a non pull cord window blind, comprising:
a casing; two resistance units, each said resistance unit comprising a one-way pawl and a resistance wheel, said one-way pawl being pivotally connected to said casing, said resistance wheel comprising a resistance wheel axle rotatably mounted in said casing and at least one one-way sprocket fixedly connected to one end of said resistance wheel axle and engaged with said one-way pawl; two first transmission wheels rotatably mounted in said casing and spaced from each other; two transmission cords respectively wound round said resistance wheel axles of said resistance wheels and respectively connected with respective one ends thereof to said first transmission wheels; two second transmission wheels rotatably mounted in said casing between said two first transmission wheels, said two second transmission wheels being meshed together and respectively meshed with said first transmission wheels; and a coil spring connecting said two second transmission wheels and selectively wound round one said second transmission wheel.