I built a barn elevator to move air dried lumber to the 2nd floor of my barn where I have a de-humidification kiln to finish off the drying of lumber from my sawmill. It has been in use over 10 years and has performed very well. I designed it to lift the load 10 feet to the 2nd floor in 1 minute and I estimate I have lifted as much as 900 lbs in one load. It uses the parallelogram concept to keep the load parallel to the ground. I made my own winch from a 1/2 hp motor, 60:1 gear reducer and an electromagnetic clutch between the motor and reducer. Of all the things I have most people are most fascinated by this than anything else. As I get older I lift lighter and lighter things.
See pics.