Door operator having lock mechanism

An electrical door operator comprising an electric motor, a rotary shaft, a locking mechanism, and a manual mechanism, the electric motor having a drive shaft engageable to and disengageable from the rotary shaft in a controlled manner, the locking mechanism being adapted to lock the rotary shaft, and the manual mechanism being adapted to rotate the rotary shaft;

• the locking mechanism comprising:
• an outer ring portion having one end provided with an annular seat which defines a central receiving portion within the outer ring portion;
• an inner ring portion accommodated in the receiving portion, and rotatably abutted the annular seat;
• a bidirectional rotary block having a spline shaft hole through which a first end of the rotary shaft formed into a spline shaft is axially and slidably insertable, wherein the bidirectional rotary block comprises a plurality of axial slots and a plurality of radial arc faces, each axial slot and each radial arc face are arranged in an alternating configuration, one side of each radial arc face intersects with one side of each axial slot adjacent thereto to form a latching angle which is spaced from an inner wall of the outer ring portion by a first distance, a midpoint of each radial arc face is spaced from the inner wall of the outer ring portion by a second distance, and each radial arc face has a radius greater than a radius of the inner wall of the outer ring portion;
• a plurality of push pins equidistantly spaced from each other being axially arranged along an inner circumference of the central receiving portion to correspond to the plurality of the axial slots, wherein each of the plurality of push pins is secured at the inner ring portion;
• each axial slot is spaced from the inner wall of the outer ring portion by a third distance, and each push pin has a diameter greater than the first distance and less than the third distance, so that each push pin is slidable on each axial slot and can be locked at the latching angle;
• and wherein both side edges of each axial slot comprise a fillet each, and each fillet has a radius that is the same as that of the push pin;
• a plurality of anti-rotation posts arranged in pairs of two, wherein each anti-rotation post has a diameter greater than the first distance and less than the second distance, each pair of the anti-rotation posts is provided on respective radial arc face, a spring is arranged between two anti-rotation posts of each pair to provide a potential energy to the anti-rotation posts so that the anti-rotation posts are slidably moved constantly in the direction of the latching angle;
• and
• a cover plate arranged to rotatably cover the other end of the outer ring portion, and securely connected to the plurality of push pins, wherein the cover plate has an external gear to operatively connect with the manual mechanism;
• wherein, when the manual mechanism is manually operated, the plurality of push pins urge the bidirectional rotary block to rotate the rotary shaft, but when the rotary shaft intends to rotate, the plurality of anti-rotation posts lock the bidirectional rotary block, so as to preclude the rotary shaft from rotating.