THERAPEUTIC-SPORTIVE INNER SOLE Russian patent published in 1998 - IPC

FIELD: mechanics, in particular, passive vibration-proofing systems used for manufacture of sportive, medical, working and everyday shoes. SUBSTANCE: inner sole has upper and lower plates sewn by mutually perpendicular variable-pitch double stitches to form square-cell members. Conical springs are inserted into each member. Springs in cells are statically biased with equal force between upper and lower plates. Such construction provides minimum natural oscillating frequency by increased static deformation and low spring stroke amplitude not limited by coil contact. EFFECT: increased convenience and comfort by optimized parameters and coordinated number of spring coils and individual's weight.