Energy-absorber for a bicycle frame

摘要

An energy-absorbing apparatus for a bicycle frame maintains critical spatial relationships by allowing the seat and the pedal assembly to move slightly, together as a unit, relative to the bicycle frame proper. A telescoping portion of the apparatus has an inner tube housed inside an outer tube. The inner tube has a seat post connected to its top end and a pedal crank axle housing connected to the bottom end. The outer tube is in a fixed, integral relationship with the other frame members. Any of a number of combinations and variations of adjustable spring/damper means isolate the inner tube from the outer tube. Numerous features, including dust boots and a rider-activated keyway lock, can be incorporated into the frame design. The telescoping design reduces impact forces without causing undesirable changes in frame geometry or undesirable changes in the distance between the seat and pedals. The energy absorbing bicycle frame reduces rider fatigue and increases rider control and comfort by allowing controlled movement of the seat and pedals up and down as a unit.