DEVICE FOR OPENING AND CLOSING OPENING

摘要

A blind device (1) is provided with a frame body (3) disposed at an opening (2); blades (4) for opening and closing the opening (2); a link mechanism (5) for connecting the blades (4) to each other; a lifting and lowering mechanism (9) which, when opening and closing the opening (2), lifts and lowers the blades (4) by lifting the lowermost blade (8) first and lowering the lowermost blade (8) first; and a reaction force generation mechanism (10) which applies reaction force to the lifting and lowering mechanism (9), the reaction force increasing and decreasing according to an increase and decrease in a load caused by the blades (4) in the opening (2), the increase and decrease in the load depending on the number of the blades (4) lifted and lowered in the opening (2) by the lifting and lowering mechanism (9), the reaction force acting in the direction opposite to the direction of the load caused by the blades (4) in the opening (2).