Oh Sh$&t it looks like it holds ok! :-) Putting one of the cranes thru its paces to see how it holds up and to be sure it is safe for its rated load. Per the customers design request it was asked that these be rated at 2 tons(4000lbs) and that they be able to clear a 10ftx10ft cube. There was considerable speculation that the sliding joint would fail under loads or that the crane might tip over. Testing shows that even with a 50% overload(6000lbs) The crane was still plenty stable and the joint even when chained off and pryed on with a load that added another500lbs at the top there was no signs of stress. This would have been a side load of probably 1000lbs to be an additional 500vertical as the force was applied with a prybar at a steep angle. This crane should be plenty strong for the normal hand use it is designed for and meet the customers specifications.
24 дек 2018
