Patent ID: 11913272
Assignee: nan
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 7:
8. The sectional lifting door system of claim 7, wherein the sleeve clutch mechanism includes at least one fixed column and at least one movable column; the at least one fixed column and the at least one movable column are accommodated in a gap between the fixed sleeve and the movable sleeve, and the at least one fixed column is connected to the movable rotary disc; the movable sleeve is provided with at least one radial protrusion; when the movable rotary disc is to be rotated, the at least one fixed column pushes the at least one movable column and rotates together with the movable sleeve; when the movable rotary disc is not in rotation, the at least one movable column is locked between the at least one radial protrusion and the fixed sleeve so that the movable sleeve is locked in the fixed sleeve.