| 摘要 |
Subject: mechanism for the hoisting and movement, in general, of industrial rolling shutters. Two operational modes:1)manual operation with a hand lever turning on the left and right for hoisting or lowering the rolling shutter when power failure orbreakdown of the motor or of the power supply system occurs; 2)manual operation with five tones hoisting worm chain the function of which is assisted by a fluted pulley setting ûupon pulling of said chain-the rolling shutter automatically into movement by synchronically interrupting any electric activity. Embodiments: construction of industrial doors, doors of big shelters destined for the covering of big vehicles, airplanes or other transport means of great dimensions. |
