For the best review in the figure is placed only frame carts. Your cart:!) Rama carts. 2,3,4,5,6,7 - Legs.
How it works: There are currently 3.5 feet and 7 feet - are on the ground and move the cart ahead. Legs 2, 4 and 6, raised and advanced to the next step forward came to the end, they fall to the ground, taking the weight on the cart itself. The legs 3,5 and 7 and will rise vydvigatsya forward to next step. Thus cart is moving constantly.