| 摘要 |
PURPOSE:To absorb the difference of the movement of wire ropes due to the difference of the diameters of two rotary drums by the expansion and contraction of the springs of elastic bodies by installing the springs of the elastic bodies to the connecting sections of the tips of the wire ropes from the two rotary drums and a door. CONSTITUTION:Elastic springs 7a, 7b are mounted onto stoppers 8 at the noses of the rods 5a, 5b of a winding mechanism using two rotary drums, and spring boxes 9 supporting both springs respectively are set up. The spring boxes 9 are installed to a door 10, and hung. When the door 10 is lifted, the difference of the quantities of wire ropes lifted due to the difference of the diameters of the rotary drums is absorbed by the expansion and contraction of the springs of elastic bodies mounted to the connecting sections of the wire ropes and the door, thus preventing the application of the weight of the door only to one of the rotary drums. Accordingly, even when there is fabrication tolerance in the diameters of the rotary drums, power is distributed properly while the looseness of the wire ropes can be removed. |
