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Originally Posted by Gary C
Um...one of our team member had an idea like that:
It would be 9 foot lead screw that just lifted the tetras up that even if you figured out how to grab a tetra, you would have to make it implode on itself to fit size recquirements. 
But, then again, maybe I'm just out of it and don't know what you want with a lead screw. 
-Gary |
We were looking at this type of collapse design, if you look at a typical 4 foot aluminum extension ladder, you can get 8 feet easily with a "lead screw" or
a winch and pulley.
If you are set on the lead screw, then look at the next diagram.
I also borrowed a picture from a barrel forklift repair manual.
http://www.morsemfgco.com/opsmanuals...E%202STAGE.pdf
This shows how to tie 2 lift pieces together and drive 1 while dragging the floater lift up in sync.
It is Your basic forklift, which you could replace the hydraulics (labeled as 31) with a lead screw.
I am sure Morse mfg will just love a thousand web hits on the repair manual page ;-)