patlabor:又搜了下,这设计都有近30年了。
特点: “The conventional down tube is replaced with a steel cable suspended from a spring. There is a hinge on the top tube right in front of the seat tube. The idea is to use the spring and cable system to return the energy lost during the pedal stroke. All of the energy is returned since there are no frictional or damping losses in the spring system. ”
http://mombat.o r g/MOMBAT/BikeHistoryPages/Slingshot.html