Patent ID: 8789575

Claim:
A blind structure comprising: a main rail, having an open slot horizontally formed at one side thereof and a first inner rail inside; a secondary rail, having a second open slot horizontally formed at one side thereof and a second inner rail inside; inner space of the secondary rail divided into a left side and a right side, and a corresponding restricting portion formed on each side; and two ends of a string disposed around the restricting portions, and each end coupled with a respective connecting unit; a main blind body, engaging with the main rail and the secondary rail through an upper end and a lower end, and two through holes formed through an upper portion to a lower portion of the main blind body; and a string body, winding several times between said two connecting units, wherein two ends thereof are inserted into the through holes of the main blind body, and tied at the upper portion of the main blind body to form a secured positioning, wherein when the string body is pulled out with the main blind body, said two connecting units are moved towards each other, and the string is stretched due to the movement of the connecting units, and the main rail or the secondary rail is capable of being securely positioned due to the winding of the string body between the connecting unit and a resilient force of the string, wherein when the main blind body is lifted to a compressed state, the main rail or the secondary rail is lifted, and the string body is loosened due to an upward force on the main rail or the secondary rail, and the two connecting units are moved away from each other due to the resilient force of the string, so that the string body are collected between the two connecting units.