Patent ID: 6135192
Filing Date: 2000-10-24
Classification: B60J,E04F

Abstract:
A blind device comprising a fixed frame, at least a pair of arms each having an end pivotally attached to the fixed frame, a moveable frame which is adapted to move toward and away from the fixed frame in a parallel relationship by rotational movements of the two arms, and a light-shielding screen having one end fixedly attached to and wound around a roll which is rotatable supported by the fixed frame, and another end fixedly attached to the moveable frame, characterized by that:a pivot shaft for pivotally supporting each arm on the fixed frame is incorporated with a spring which resiliently urges the corresponding arm toward its upright position, and another end of each of the arms is slidably engaged by the moveable frame, the blind device further comprising an electric actuator having reverse drive preventing means for applying a rotative force to the roll so as to wind the screen thereon against a spring force of the spring,further comprising a male thread shaft which is rotatable jointly with a rotary shaft of the electric actuator, an axially moveable member having rotation preventing means for keeping the axially moveable member rotationally fast, and threadably engaging the male thread shaft, and switch means for detecting a displacement of the axially moveable member along the male thread shaft,wherein a striker for actuating the switch means is attached to the axially moveable member via axial distance adjusting means, andwherein a second spring is interposed between the axially moveable member and the striker to urge them in a prescribed direction.