Cylinder Type Door Operator

摘要

A cylinder type door operator is provided. The door operator is disposed in a hollow winding shaft pivotally provided in a winding shaft box for moving a movable barrier. The door operator comprises: a tubular housing, an electric motor, an output shaft, an electromagnetic brake, and a centrifugal brake. The electric motor is accommodated in the tubular housing. The tubular housing has one end inserted into the winding shaft and the other end secured to the winding shaft box. The output shaft has one end coupled to the drive shaft and the other end protruded out of the tubular housing and secured to the winding shaft. The electromagnetic brake is provided for braking the drive shaft. The centrifugal brake is provided for limiting the rotational speed of the drive shaft.

主权项

1. A cylinder type door operator disposed within a hollow winding shaft pivotally provided in a winding shaft box for moving a movable barrier, the door operator comprising:
a tubular housing having an internal space, the tubular housing comprising a first end inserted into the winding shaft and a second end secured to the winding shaft box; an electric motor accommodated in the internal space of the tubular housing, the electric motor comprising a drive shaft having a first end and a second end; an output shaft one end of which is coupled to the first end of the drive shaft and the other end of which is protruded out of the tubular housing and provided with an output wheel engaged with the winding shaft; an electromagnetic brake which comprises an electromagnet and a brake disc and which is configured to brake the drive shaft of the electric motor when the electromagnet is electrically energized and to release the drive shaft of the electric motor when the electromagnet is electrically de-energized, wherein the electromagnet is disposed to surround the second end of the drive shaft and secured to the tubular housing, and the brake disc has an end surface facing the electromagnet and is provided on the drive shaft; and a control circuit which is electrically connected to both of the electric motor and the electromagnet and which is configured to electrically energize the electric motor while electrically de-energizing the electromagnet and to electrically energize the electromagnet while electrically de-energizing the electric motor so that the drive shaft of the electric motor is braked when the electric motor is electrically de-energized, the drive shaft is released when the electric motor is electrically energized, and the movable barrier is moved by using potential energy, which is stored or increased while the movable barrier is moved to open a door, so as to shut the door automatically when both of the electrical motor and the electromagnet are electrically de-energized or when a power failure occurs.