Is gravity energy-saving lever another perpetual motion machine (see patent 200620 138684.2)?

Gravity work requires the weight to have a height, and the height of the weight is lifted by external force. The falling of heavy objects can produce kinetic energy, which is the result of this external force. If friction resistance is not considered, potential energy can raise it to its original height, and it will move forever. The problem is that friction exists. If you want it to output a work, you are increasing this friction, and the result is; The potential energy will be less and less, and finally the heavy objects will not fall to the ground, have no height, do work repeatedly and become perpetual motion machines. Study it in a different way. If the questioner does not object. I am willing to continue to communicate with you.