Lazy Split Log Splitter:  U.S. Patent # 5,575,319  

For the millions of people who split wood by hand, or use wood for heating, this log-splitting machine uses the power of a 30-ton hydraulic jack and twisted screw wedge to easily and safely split 14" diameter logs. The operator hand pumps the hydraulic ram and forces the log into the wedge. A simple pulldown of the lever drives the wedge through the already-split log. ADVANTAGES: Environmentally safe, no gasoline engine. So safe that even a 14-year old can operate the machine. Costs 40 % less than an equivalent gas-powered model.