| 摘要 |
<p>A pulley means, particularly for lifting apparatuses, comprising supporting means (2, 3, 4, 26) for rotatably supporting a pulley (5, 6, 9) having a peripheral groove suitable for receiving a respective rope (10), stop means (19, 20, 18) of said pulley comprising first stop means (19, 20) integral with said pulley (5, 6, 9) and designed for receiving second stop means (18) supported by said supporting means (2, 3, 4, 26), the second stop means (18) being associated with speed detecting means (13, 14, 15) that controls the action of said second stop means (18) on said first stop means (19, 20) when the peripheral speed of said pulley (5, 6, 9) exceeds a predetermined value, said pulley (5, 6, 9) comprising a central portion (5, 6) provided with at least a first coupling surface (7) to which a separate pulley crown element (9) having said peripheral groove is fixed.</p> |
