Cord-winding device for a blind assembly having no pull cord

摘要

A cord-winding device for a blind assembly having no pull cord includes a base seat defining a slide channel and having a bottom side configured to removably mount the blind assembly thereto, and an adjustment unit including a slide seat mounted slidably in the slide channel, a plurality of rollers mounted on the base seat and the slide seat, respectively, and a constant force spring having first and second ends respectively fixed to the base seat and the slide seat. A lift cord winds around the rollers and extends through the base seat. The lift cord is configured to extend through the blind assembly after extending through the base seat so as to be positioned to the base seat and the blind assembly.

主权项

1. A cord-winding device for a blind assembly having no pull cord, said cord-winding device comprising:
a base seat extending along a longitudinal direction and defining a slide channel that extends along the longitudinal direction, said base seat having a bottom side configured to removably mount the blind assembly thereto; an adjustment unit including
a slide seat mounted slidably in said slide channel,a roller set including a plurality of rollers mounted on said base seat and said slide seat, respectively, anda spring unit including a constant force spring that has a first end fixed to said base seat and a second end fixed to said slide seat; and a lift cord winding around said rollers and extending through said base seat, said lift cord being configured to extend through the blind assembly after extending through said base seat so as to be positioned to said base seat and the blind assembly, said lift cord being configured to support the weight of the blind assembly to thereby generate a pulling force to pull said slide seat, said slide seat in turn pulling said constant force spring so that said constant force spring generates a resilient restoring force, the resilient restoring force counteracting the pulling force of said lift cord to achieve a force-balanced state, wherein said first end of said constant force spring is formed with a noncircular lock hole, said spring unit further including a pad that has a protrusion inserted into said lock hole, and a fastener to fix said first end of said constant force spring to said base seat.