US 11,988,041 B2
Scrolling system for window curtain
Wen Ying Liang, Changhua County (TW); and Jian Zhi Huang, Changhua County (TW)
Assigned to CHING FENG HOME FASHIONS CO., LTD., Changhua County (TW)
Filed by Wen Ying Liang, Changhua County (TW); and Jian Zhi Huang, Changhua County (TW)
Filed on Apr. 8, 2021, as Appl. No. 17/225,921.
Claims priority of application No. 109216493 (TW), filed on Dec. 14, 2020.
Prior Publication US 2022/0186558 A1, Jun. 16, 2022
Int. Cl. E06B 9/76 (2006.01); E06B 9/42 (2006.01)
CPC E06B 9/76 (2013.01) [E06B 9/42 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A scrolling system for a window curtain, comprising:
a scrolling device including a frame and a shaft, a curtain scrolled to the shaft;
a transmission device connected between the shaft and the frame so as to rotate the shaft and to scroll the curtain, the transmission device including a housing, a first transmission unit and a second transmission unit, the housing located between the frame and the shaft, the housing being a hollow housing and including a first space and a second space, the first space defined in a lower portion of the housing, the first transmission unit accommodated in the first space, the second space defined axially in the housing, the second transmission unit accommodated in the second space;
the first transmission unit including a first bevel gear, a first portion and a second portion, the first portion being formed between the first bevel gear and the second portion, the first bevel gear and the first portion movably located in the first space, the second portion extending beyond the first space, a driving rod connected to the second portion, the second portion being rotated by the driving rod so that the first transmission unit rotates in the first space, the first portion including a cylindrical section and a polygonal section, a polygonal passage formed to an inner periphery of the first space, wherein the cylindrical section is located relative to the polygonal passage when the driving rod is not pushed upward, the first transmission unit is rotatable, wherein the polygonal section is engaged with the polygonal passage when the driving rod is pushed upward, the first transmission unit is not rotatable, and
the second transmission unit including a second bevel gear and a tubular part, the second bevel gear connected to the tubular part and engaged with the first bevel gear, wherein the second bevel gear is engaged with the first bevel gear regardless of movement of the driving rod, an axis of the first gear being perpendicular to an axis of the second bevel gear, the tubular part connected to the shaft, when the driving rod is rotated, the first bevel gear drives the second bevel gear which rotates the tubular part, such that the shaft is rotated to operate the curtain.