| 摘要 |
The invention relates to a safety device for winch-type apparatus for moving loads. Two longitudinal elements containing a winch between them are connected by a first transverse element on which two telescopic sleeves are pivotably mounted. A calibrated spring is received in each pivotable sleeve. A second transverse element also connects the two longitudinal elements. The second transverse element supports the sleeves and a yoke of a guide pulley for a cable to be wound and unwound from the winch. The tension in the cable causes the springs to pivot the yoke thereby preventing excessive tension on the cable when a load drawn by the winch encounters resistance and preventing excessive unwinding of the cable when the load is interrupted in its descent. The safety device can be used in all winch-type apparatus, and in particular in hoisting apparatus with telescopic ladders for building sites. |
