PNEUMATIC SPRINGY BOOTS Russian patent published in 1997 - IPC

FIELD: shoes industry. SUBSTANCE: boot has bottom part with all-metal springy base, where hermetically sealed chamber with air charging valve is positioned. Increased-pressure chamber is positioned in the middle part of main chamber to double repulsion energy. Return valve of increased-pressure chamber is positioned adjacent to heel and lock valves are positioned adjacent to metatarsus. Airduct communicates cavities under heel and metatarsus. Increased-pressure chamber is further provided with lock valve, cover and pivot pin. Under the weight of heel, air is expelled from hermetic chamber part under heel into increased pressure chamber. During turning of foot, air is drawn from part of hermetic chamber below metatarsus under the action vacuum and is delivered through airduct opening into hermetical chamber below heel. During further turning of foot, springs below metatarsus are compressed under the weight of User. When metatarsus approaches its lower position, cover of airduct is closed under the weight of upper base and pin is removed to open increased pressure chamber valve. Compressed air in conjunction with spring provide for repulsion. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 9 dwg