Patent ID: 8985181
Filing Date: 2015-03-24
Classification: A62C,E05F,E05Y,E06B

Abstract:
1. A machine mechanism ( 1 ) of a door operator for automatically unwinding a curtain of a rolling door wound on a winding shaft in a power failure, the machine mechanism comprising an electric motor unit ( 20 ), a first electromagnetic clutch unit ( 30 ), a combination pull-chain disc and brake ( 40 ), and a second electromagnetic clutch unit ( 60 ), which are accommodated within a housing ( 10 ) in sequence, wherein: a first rotating shaft ( a right end of a second rotating shaft ( a hollow shaft ( an electric energy storage device is provided, for electrically powering the second electromagnetic clutch unit ( the combination pull-chain disc and brake ( the torsional spring the second electromagnetic clutch unit ( in the case of normal power supply, after the curtain of the fireproof rolling door is wound by the electric motor mechanism ( in the case of power failure, the second electromagnetic clutch unit ( in the case that the curtain of the fireproof rolling door has fallen down, the second electromagnetic clutch unit (