Patent ID: 8402857

Claim:
A fast clutch mechanism for an industrial door in which a worm meshes a worm wheel rotatably mounted on an output shaft of a transmission box, wherein the fast clutch mechanism comprising: a clutch sleeve surrounding the output shaft, a rotation-limiting device being disposed between an inner wall of the sleeve and an external wall of the output shaft, a clutch assembly being located between one end of the sleeve and the worm wheel, and a ring portion being extended outwardly from the other end of the sleeve; a rotation device comprising a rotation shaft and a rotation actuating device coupled with one end of the rotation shaft; a bevel gear driving device comprising a primary bevel gear mounted on the rotation shaft and a secondary bevel gear engaging with the primary bevel gear; a differential device comprising a drive gear rotatable with the secondary bevel gear, two follower gears engaging with the drive gear, and two cam shift levers connecting respectively the two follower gears in an axial direction, the two cam shift levers resisting against the ring portion of the clutch sleeve so as to make the clutch sleeve slide between an engagement position and an disengagement position with the clutch assembly.