VERTICAL STAIRWAY

The reason for both problems is that the centre of gravity (COG) of the climber is not supported over the feet - it "hangs out" in space - away from the ladder. Gravity forces the body to rotate - around the fulcrum of the feet - and away from the ladder... Only half of the bodyweight is supported on the stronger legs - the other half must hang by the arms. People can stand on their feet all day - but cannot hang by their arms for long. If you can no longer hold on [due to fatigue]; or carelessly miss grabbing a rung - then you fall backwards off the ladder... This design solves a major ergonomic problem for long ascents or descents; it is superior to all other vertical ladders

Also known as: Vertical Stairway Pty Ltd

Primary location: Lightning Ridge Australia