From: none@none.com99   
      
   On 8/14/2024 9:58 AM, Jim Wilkins wrote:   
   > "Jim Wilkins"  wrote in message news:v9ibrb$fgnr$1@dont-email.me...   
   > ...   
   > Perhaps you could suspend a carefully leveled beam track from your existing   
   > structure to allow lifting and moving a load off a trailer and onto   
   > pipes or   
   > machinery mice, then set it on the floor with a J-bar.   
   > ...   
   > -------------------------   
   > Bad example, you can lift the load and move the trailer, and you have   
   > tongue jacks.   
   >   
   > Besides the gantry I have tripod hoists that lift vertically, equivalent   
   > to your stationary suspended hoist. They are cheaper, simpler and   
   > lighter and what I use most, though for assembling the parts of a   
   > milling machine or similar jobs a moving gantry is better.   
   >   
   >   
      
   No, not a bad example.  Sure it doesn't fit my exact situation, but its   
   useful information.   
      
      
   My plan in case I failed to explain it accurately is to lift the load,   
   roll the trailer forward, and lower the load onto a heavy pallet.  I'll   
   probably put the pallet under the trailer so that total suspension time   
   of the load will be measured in single digits.   
      
   Two things...   
      
   1.  I have looked at prefab gantry cranes and there are many with   
   adequate vertical clearance... and as you mentioned.. 8 ft width.  They   
   do not have an 8 ft span however.  Most are 8' to the center of the   
   caster pivots.  94-ish inches between the uprights.  This makes it   
   impractical for unloading heavy utility flat bed trailers which are   
   typically 8' wide or in some cases 8'6 inches wide.  Wider ones are   
   available of course.  A gantry has the advantage of a being able to use   
   a trolley instead of a beam clamp of course.   
      
   2.  I actually have considered installing a vertical I-Beam to one side   
   of the parking bay. (There are shelves there so it really would not be   
   in the way even though it is an open span building.)  Then installing a   
   horizontal beam from it to the near column.  Braced of course.  This   
   would also allow for use of a trolley instead of a beam clamp.  I-beams   
   tend to be lighter than I would like to use or nearly as much as the   
   cost of a complete gantry crane, even for excess inventory, locally.   
      
   --   
   Bob La Londe   
   CNC Molds N Stuff   
      
      
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