Patent ID: 8342309

Claim:
A blind operating device for respectively transmitting a rotation in both directions from an operation portion to a driving shaft of the blind comprising: an input shaft into which rotation from the operation portion is adapted to be inputted; a rotation shaft that is arranged coaxially with the input shaft and is capable of transmitting rotation to the driving shaft, said rotation shaft including a rotation spring winding shaft; a fixed body, said fixed body including a fixed spring winding shaft which is aligned with the rotation spring winding shaft; a clutch spring that is wound around the fixed spring winding shaft of the fixed body and the rotation spring winding shaft of the rotation shaft for allowing switching of linking and de-linking of the rotation shaft and the fixed body by utilizing tightening and loosening of the clutch spring, one end of the clutch spring being connected to the rotation shaft; and a clutch spring receiver which is arranged rotatably around a peripheral surface of the fixed spring winding shaft of the fixed body and to which the other end of the clutch spring is connected; wherein when rotation in one direction is inputted to the input shaft, the input shaft rotates the rotation shaft to press the one end of the clutch spring so as to loosen the clutch spring whereby the rotation shaft is allowed to rotate with the input shaft, when rotation in the other direction is inputted to the input shaft, the input shaft rotates the clutch spring receiver to press the other end of the clutch spring so as to loosen the clutch spring whereby the rotation shaft is allowed to rotate with the input shaft.