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Need to design a straddle carriage to be able to lift a ton - any Welders out there?

boyblue

TUG Member
Joined
Jun 6, 2005
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Location
Nassau, Bahamas
Couldn't find an image to link but a straddle carriage is a platform with two sides and a header used to lift pallet loads of cargo buy the header using (in my case) an electric chain hoist.

I need to design a straddle carriage to be able to lift a maximum of 1 ton. I'm getting quotes from different guys but because they are using different plans I'm not sure which one makes the most sense.

The unit is to be 5' x 5' at the base & and 7' high.

The options are:

3 x 3 x 3/16 square tubing around the perimeter with 1/4" plate as the floor
3 x 3 x 3/16 square tubing for uprights & Header. The uprights are braced on the two sides with a diagonal from corner of base to halfway up the upright.

2 x 2 x 1/4 square tubing around the perimeter and a cross brace underneath a 3/16" plate as the floor
2 x 2 x 1/4 square tubing on the uprights & a 2 x 3 x 1/4 Header. The uprights are braced on the two sides with a diagonal 2 x 2 x 1/4 from corner of base to 3/4 up the upright.

2 x 3 x 3/16 rectangular tubing around the perimeter and double 2 x 3 x 3/16 bracing in both directions underneath. A 1/8" plate or extruded matting on the floor
2 x 3 x 3/16 rectangular tubing on the uprights & a 3 x 3 x 1/4 Header. The uprights are braced on the two sides with a diagonal 2 x 3 x 3/16 from corner of base to halfway up the upright.
 
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