You would want to build a mechanism similar to one of these below.
DC Torso Erector www.dcprops.com/stock.htm
Boo Crew Production makes a Coffin Sitter www.boocrewproduction.com
Evilusions http://evilusions.com/shop/product_i...oducts_id=1052
You also want to use real pneumatic components. Building anything pneumatic out of PVC is dangerous.




iv tried it using pistons i made out of pvc pipe but with no success. Id be happy just to get the thing to sit up, it just needs to be powered by compressed air.




