Abstract: An electric window blind comprises a driving member capable of being actuated by an action rod to cause the rotary wheels to engage the transmission wheels at the time when the power outage takes place. The rotary wheels can be therefore actuated manually so as to keep to electric window blind in an operating condition in the event of a power interruption.

Abstract: An interconnecting structure for connectable tape stands formed with a plurality of resilient fingers extending axially from the free end of a hollow cylinder which extends from the inner face of a side wall, and the free ends of the resilient fingers being formed with radially outwardly facing flanges. Through holes penetrating onto the wall of the supporting cylinder are formed in alignment with the resilient fingers on the outer face of the side wall. As a result, when the resilient fingers of one tape stand are inserted into the corresponding through holes on another tape stand, the flanges on the respective resilient fingers will enter the through holes and rest on the inner face of the side wall, thus to complete the interconnection of the tape stands. In addition, grooves are formed axially inwardly in the hollow cylinder on both sides of the resilient fingers for increasing the flexibility of the resilient fingers such that a tape roll is easy to replace.