| 摘要 |
A variable advantage force applying device is disclosed as applied to a load binder used to tighten a flexible fastener such as a rope, cable or chain around a load to hold the load against shifting on the bed of a carrier or to fasten a bundle of heavy objects together. The device uses a lever pivoted to one end of the flexible fastener and connected to the other end of the fastener by a pin and slot. The slot is curved and disposed to move the pin toward the pivot for the lever as the lever is swung in a tightening direction. As the pin moves closer to the pivot, it increases the mechanical advantage of the lever at the stage of the tightening operation during which the resistance to tightening increases. An overcenter arrangement is incorporated in the pin and slot according to accepted design practice to hold the fastener in a tightened condition. |
