| 摘要 |
A motor drive arrangement for a door 14 has a draw chain 2 which is guided between a drive chain wheel 5 and a guide chain wheel 8, the chain 2 being connected to the door 14 by way of a draw member 12 movable by the chain along a mounting rail 1 which is provided with vertical webs 21 which extend longitudinally of the rail and have inturned flanges 22 which form between them gaps for receiving the pins or rollers 23 of the chain 2. Above and below the flanges 22, spaces which are wider than the gaps receive the side plates 24 of the chain. <IMAGE> |
