Patent ID: 7055283

Claim:
A control system for switching an electric operation to a manual operation of a door opener, comprising: a housing 11 , including a power unit 12 driving a shaft 120 electrically and transmitting the power to an output shaft 16 ; a braking device 13 , used for braking said shaft 120 and releasing said shaft 120 ; a pull-chain disk device 15 allowed for exerting an external force via a pull chain 152 to rotate said shaft 120 ; a clutch device 18 , disposed between said shaft 120 and said pull-chain disk device 15 , used for unidirectionally rotating said shaft 120 controllably when said pull-chain disk device is rotated by said external force; a protective device 17 used for cutting off a circuit of a door opener 10 ′; and a driven disk 158 interlocked with said clutch device 18 so as to engage a U-shaped sway plate which swings by an angle and engages a sensor switch for actuating said protective device 17 such that said circuit of said door opener 10 ′ is cut off and the braking device is released jointly to automatically switch to a safe manual mode, once said pull chain 152 is pulled.