| 摘要 |
A device in rope hoists for limiting speed when lowering a load, comprising a rotatable drum, around which the rope is to be wound, a first friction surface on one end side of said drum, and a second friction surface, unrotatable in relation to the shaft. The friction surfaces are arranged to be moved into engagement with each other automatically in response to the load to be lowered through the use of a helical surface. The friction force between the friction surfaces is proportional to the weight of the load to be lowered. |
