Patent ID: 9316050
Filing Date: 2016-04-19
CPC Classification: E06B

Claim Text:
1. A control unit for a curtain assembly, comprising: a spring having a first end and a second end, the second end of the spring being fixed to a head box of the curtain assembly; a fixed part fixed to the head box and having a first passage defined therein, the fixed part having multiple first pillars located therein; a movable part located in the head box and between the spring and the fixed part, the movable part having a second passage defined therein, multiple second pillars located in the second passage, a number of the second pillars being different from a number of the first pillars, multiple rollers connected to the movable part and movably in contact with the head box, a first fixed member connected to the movable part, the first end of the spring connected to the first fixed member, and an operation cord having a first end fixed to a bottom bar of the curtain assembly, a second end of the operation cord continuous with the first end extending through the curtain body and the head box, the second end of the operation cord wrapped to the first pillars via the first passage and the second pillars via the second passage in a back-and-forth form, the second end of the operation cord extending through the head box and the curtain body and being fixed to the bottom bar of the curtain assembly.