| 摘要 |
An automatic roll-up device is applied to a Venetian blind which rolls up laths by itself through a feedback action. The roll-up device uses specifically a single shaft tube, an interior of which provides axially for installation of a volute spring and which is driven directly by the volute spring. An outer circumference of the shaft tube links and rolls up lift cords directly to achieve a dual-functional roll-up effect in a limited and simple structure.
|
