you might try a Bow, positioned above for a return, the closer to the head the rope is, the less it takes to return it to the up position. The bow was used a lot for spring pole lathes and foot powered up and down saws, by Woodworkers.
Basic principle is a relly strong bow above with a douple string on it. similar to when kids of years ago put a string thru two holes of a button and it whirled back and forth as you tensioned and released the string, The button is replaced with a spool to apply lift to the tool and as it contracts the bow by twisting the 2 strings, the bow really doesn't move all that much. see drawing below.
__________________
Irnsrgn
Knowledge must be shared or it lies dead in the mind.
The Blacksmith must use Hammer and Flame to force the iron down the path of his own choosing.
I usually find it much easier to be wrong once in while than to try to be perfect.
|