Patent ID: 7537038

Claim:
A release control mechanism ( 1 ) installed in a rolling door-controlled emergency exit, which comprises a mechanism ( 2 ), a release control lever ( 3 ) provided outside said mechanism ( 2 ) for releasing a brake of said mechanism ( 2 ) from a torsion spring member, and a releasing cable ( 4 ), which has a first end connected to said release control lever ( 3 ) and a second end coupled to said release control mechanism ( 1 ), said release control mechanism ( 1 ) comprising: a housing ( 10 ), which defines therein an accommodating chamber ( 11 ); a substrate ( 20 ) mounted inside said housing ( 10 ), said substrate ( 20 ) comprising a first vertical portion ( 21 ) disposed at one side, a second vertical portion ( 22 ) disposed at an opposite side, a third vertical portion ( 23 ) extending from said second vertical portion ( 22 ) at a bottom side, and a guide pin ( 231 ) perpendicularly extending from said third vertical portion ( 23 ) toward said first vertical portion ( 21 ); a rocker arm ( 30 ), which has a first end pivotally coupled to said second vertical portion ( 22 ) of said substrate ( 20 ), an elongated sliding slot ( 32 ) longitudinally disposed on a middle part thereof and coupled to the guide pin ( 231 ) of said substrate ( 20 ), and a pulley ( 34 ) pivotally provided at a second end thereof; a button ( 40 ), said button ( 40 ) comprising a head ( 45 ) suspending outside said housing ( 10 ), a shank ( 41 ) perpendicularly extending from said head ( 45 ) and inserted into said housing ( 10 ), a longitudinal coupling hole ( 42 ) defined in said shank ( 41 ) and coupled to said guide pin ( 231 ) to guide axial movement of said button ( 40 ) along said guide pin ( 231 ), and a stop flange ( 43 ) protruded from one end of said shank ( 41 ) remote from said head ( 45 ) and stopped against said rocker arm ( 30 ); a sliding block ( 50 ), said sliding block ( 50 ) a center through hole ( 51 ) coupled to said shank ( 41 ) of said button ( 40 ) to guide movement of said sliding block ( 50 ) along said shank ( 41 ); a crank arm ( 60 ), said crank arm ( 60 ) comprising a first end ( 61 ), a second end ( 62 ), a curved middle portion ( 63 ) pivotally connected to said substrate ( 20 ), an elongated sliding slot ( 611 ) disposed at the first end ( 61 ) and coupled to said sliding block ( 50 ) with a pin ( 612 ), a connecting portion ( 621 ) provided at the second end ( 62 ) and fastened to one end of said releasing cable ( 4 ), a notch ( 622 ) disposed at the second end ( 62 ) and adapted to engage the pulley ( 34 ) of said rocker arm ( 30 ); and a torsion spring ( 70 ) adapted to bias said crank arm ( 60 ) and to force said notch ( 622 ) of said crank arm ( 60 ) into engagement with said pulley ( 34 ) of said rocker arm ( 30 ).