table with rack podenoy

grabcad

table for one to be able to pedal up to 15 mm. while lifting 500 kg efforts should be made 70 - 72 kg, which corresponds to an average weight person. with some refinement it's can be reduce. table is lowered slowly through the parking brake, the force is 10 - 12 kg. scheme is fully working. strength of components meets reality. for the production design does not require precise equipment, expensive operations and parts (gears, worm gears, helical pairs, bearings). the weight of working part approximately 30 kg.