Patent ID: 9121221
Filing Date: 2015-09-01
Classification: E06B

Abstract:
1. A cord-winding assembly of a window blind comprising: a first spool having a first axis extending in an axial direction, wherein a plurality of first grooves is formed on an outer periphery of the first spool, wherein the plurality of first grooves is parallel to each other, wherein each of the plurality of first grooves has a circumferential length different from other first grooves, wherein the first spool has a large end and a small end, wherein the large end has a diameter larger than a diameter of the small end; a second spool having a second axis extending in the axial direction, wherein the first and second axes are parallel to each other, wherein a plurality of second grooves is formed on an outer periphery of the second spool, wherein the second grooves are parallel to each other, wherein the second spool has a large end and a small end, wherein the large end of the second spool has a diameter larger than a diameter of the small end of the second spool, wherein the large end of the second spool is aligned with the small end of the first spool in a radial direction perpendicular to the axial direction, and wherein the small end of the second spool is aligned with the large end of the first spool in the radial direction perpendicular to the axial direction; a spring assembly; and a spool assembly, wherein the spring assembly comprises two spring spools and a spring having two ends fixed to the two spring spools, respectively, wherein the two spring spools are parallel to each other, wherein the spool assembly comprises a first cord spool, a second cord spool and a spool cord having two ends fixed at the first and second cord spools, respectively, wherein the first cord spool is connected to one of the two spring spools of the spring assembly, and wherein the second cord spool is connected to the small end of the first spool.