Stone Clamp
Some details of the stone clamp I built, which I freely admit is a copy of the Probst boulder clamp (http://www.probst-handling.co.uk )
. I've used the clamp to build a retaining wall (see it here) and plan to use it to gather stone for other projects.
Here is the materials list to build it.
9' 3"x2"x0.25" tube
9' 1/2"x3" flat bar
1' 1/4"x2-1/2" flat bar
13'-6" 3/8"x2-1/2" flat bar
6' 5/8 round bar
6" 1.25" X 0.250" DOM tube, with 0.75" inner diameter
1 -- 3/4" grade 8 6" bolt, 4 flat washers, 1 lock washer, one nut
2 -- 18" sections of grade 70 chain
2 -- 3/8" slip hooks grade 70
2 -- 3/8" chain connectors grade 70
1 -- 3/4" shackle
Drill a 1-1/4" hole at the pivot point of the 3"x2" tube, weld in 1-1/4" DOM tube to support 3/4" bolt. Weld 3/8" flat bar to 1/2"
'claws' to provide lateral support. Use 5/8" round bar to form pickup points. Download the boulder clamp manual from the Probst web site, it contains good
drawings to get an idea of how to assemble it.
Don't use grade 30 hardware.
Use at your own risk.
See other projects here