Patent ID: 11933103
Assignee: CHING FENG HOME FASHIONS CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A motorized window blind comprising:
a top rail;
a bottom rail;
a plurality of slats assembled between the top rail and the bottom rail, and a control device received in the bottom rail and including a transmission unit, a motor, a first cord, a second cord and a power supply, the power supply powering the motor, the motor connected to the transmission unit, a first end of each of the first and second cords connected to the transmission unit, a second end of each of the first and second cords extending through the slats and connected to the top rail, the transmission unit being driven by the motor to lift and lower the slats, the transmission unit including a box, a passive member, a first member and a second member, the passive member, the first member and the second member received in the box, the passive member including a bevel gear and a main gear which is co-axially formed with the bevel gear, the motor including a shaft which is connected with a driving gear, the driving gear engaged with the bevel gear so as to drive the passive member, the main gear located beneath the bevel gear, the first member including at least one first gear and a first spool, the second member including at least one second gear and a second spool, the at least one first gear of the first member engaged with the main gear of the passive member so as to rotate the first member in a rotational direction opposite to a rotational direction of the passive member, the first cord wound to the first spool and extending through the slats and connected to the top rail, the at least one second gear of the second member engaged with the at least one first gear of the first member, the first member rotating the second member to rotate in a rotational direction opposite to a rotational direction of the first member, the second cord wound to the second spool and extending through the slats and connected to the top rail, the control device including an angle detection member which is located in the motor, the angle detection member detecting rotational position and speed of the motor, the angle detection member of the control device controlling tilt state of the slats and angularly controlling the slats for occluding a window opening.