On Sat, 25 Jun 2011 13:41:50 -0700, Denis G. wrote:
On Jun 23, 1:24Â*pm, "Pete C." wrote: [...]
I'm trying to design a lift system that can lift a loaded (up to 60k#)
ISO intermodal cargo container 4'+ vertically so that a container
chassis or regular flatbed trailer can be backed under it for
loading/unloading similar to the way "slide in" truck campers are
loaded and unloaded. A further complication is that the lift unit
should be able to break down into components that are not more than
about 150# each, and be able to be assembled and disassembled by one
person in a reasonable amount of time, say 1hr. The lift unit can not
get in the way of the lower corner points of the container so that it
can be raised/lowered from a normal chassis with corner locks.

I've worked up a rough concept that looks like it could meet these
criteria: [...] http://wpnet.us/container_lift.jpg
[snip concept description]

I own a 40' container and several friends of mine also own similar
containers. Moving these containers typically requires an expensive
crane and/or an expensive "Landol" style tilt bed trailer. With a lift
system like this the savings in being able to readily load/unload from
an ordinary flatbed trailer or container chassis would add up pretty
quickly.
....
http://www.youtube.com/watch?v=VyKDDR9dd6k

Per http://www.ascom-italy.it/products-file.php?idc=13&idp=17 etc,
that ATS 200 has 7 times the necessary capacity. A much-smaller BHT
40 would be big enough for 30 tons, but still weighs a bunch of tons
and isn't composed of 150# pieces that can be assembled in under an
hour. Nowhere close to Pete's specs.

I think the under-150#-per-piece spec is unrealistic. Instead allow
up to say 500# each, building parts on small wagons or trailers like
items #90153 plus #37510 at http://www.harborfreight.com/, with some
of them having stabilizer support legs that swing out and pin in place.
Two parts would be left and right sides of a lift frame, to lift one
end of the container. Other parts would be sets of rollers with stands.
With one end of container lifted, insert a roller set under the end,
then adjust and brace the legs of the stand. Put the transport trailer
near the stand and attach winch between trailer front and container.
Remove lift frame, then winch container onto trailer, or possibly move
lift frame to other end of container and put another roller set or two
under container before winching it aboard.

--
jiw