| 摘要 |
A slip-free sheave or pulley has a housing forming a carrier roller with a circumferential groove and beads bulging out of the side walls of said groove. Inside the carrier roller is a control ring and a force ring arranged partially side by side. A journaled latch pawl cooperates with one of its ends with the force ring. The latching end of the pawl cooperates with a control member rotatably supported in the housing, whereby the sheave may be locked in one direction and freely rotatable in the opposite direction, or vice versa, and whereby the sheave may be controlled through the rope to be changed from one state, for example locked, into another state, for example freely running. |
