The essence of the lever principle is that the longer the power arm, the more effortless it is. As Archimedes said, "Give me a fulcrum, and I can pry the entire earth. If there is a fulcrum, when the crowbar reaches a sufficient length, this seemingly nonsense is actually feasible, and the length of the crowbar can be calculated through data.
So some people arrogantly modified the screw jack by lengthening and welding the original jack handle, in order to achieve a more labor-saving effect when lifting heavier objects, and also to facilitate multiple people to hold the handle for operation. This operation method is a serious violation and even somewhat unreasonable. Where did it go wrong?
It's simple. Extending the handle only considers labor saving and ignores the rated load of the screw jack itself. This labor saving only affects the operator's feeling, and the actual weight borne by the screw jack remains unchanged. Extending the hand rod can cause a change in its strength. The strength of the hand rod that has been welded and extended can never reach the strength of the original hand rod, which may pose a risk of fracture during operation.
So, Guanhang reminds everyone that it is very dangerous to extend the hand rod of the screw jack for lifting operations without authorization. Be sure to prevent this operation from happening.
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