| 摘要 |
PURPOSE:To permit switch-over of electrical operation and manual operation in an electrically driven curtain clutch, by using balls capable of transmitting a drive power by a centrifugal force. CONSTITUTION:A drive wheel 20 integrally mounted to a drive shaft 11 is rotated by rotation of a motor. As a result, balls 41 received in recesses 22 of the drive wheel 20 are raised from an inside circumferential surface along a slant surface to an outside circumferential surface by a centrifugal force, and are urged by projections 23 of the drive wheel 20 thereby to be rotated together therewith. Then, the balls comes to abutment against recesses 34 of projections 33 of a driven wheel 30 to rotate the driven wheel 30 together with the drive wheel 20. In the case of manual operation, while the driven wheel 30 integrally formed with a pulley is rotated, the balls 41 are located at a position inside of an outer end of the driven wheel 30. Accordingly, the rotation of the driven wheel 30 is nt hindered by the balls 41, and a curtain may be freely opened and closed by the manual operation during stoppage of the motor. |
