Boots – shoes – and leggings – Orthopedic boot or shoe with corrective element – Arch support
Patent
1997-12-19
1999-11-09
Dayoan, B.
Boots, shoes, and leggings
Orthopedic boot or shoe with corrective element
Arch support
36 43, A43B 714, A43B 1338
Patent
active
059790865
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an insole for footwear, the sole including a topfoil and a backfoil, which are joined along their respective edge areas to form a first closed chamber between the topfoil and the backfoil, the first chamber being filled with a fluid, and the sole also including at least one intermediate foil arranged between the topfoil and the backfoil and joined with the topfoil and the backfoil along edge areas.
THE PRIOR ART
U.S. Pat. No. 4,115,934 describes an insole produced from a plastic material and including a first chamber filled with fluid. The sole further includes second chambers filled with fluid and having a sealed periphery and positioned completely within the periphery of the first chamber but separated from the first chamber. The second chambers may be provided in a front, central or rear part of the sole. However, this insole has the disadvantage that the individual chambers are completely separated. This is a disadvantage if the foot is to be relieved in the form of shock absorption or massage of the foot. A fluid contained in a limited chamber is only able to relieve impacts in the form of static pressure.
U.S. Pat. No. 4,567,677 also describes an insole. The sole also includes a first chamber filled with fluid. The sole further includes flow barriers provided in the central part of the sole. The flow barriers extend in two C-shapes to form further four flow channels and a large inner flow channel in the central part of the sole. However, this insole has the disadvantage that no independent chambers exist having fluid in complete separation from the rest of the fluid. This is a disadvantage if the foot is to be relieved of pressure when the person is moving. A fluid that is able, freely or subject to a few restrictions in the form of barriers, to flow freely in the entire extension of the sole, will be pressed away from the load area by the person's movement, meaning that such a sole is only able to relieve impacts requiring a shock absorption when walking or running or requiring a massage effect.
U.S. Pat. No. 4,864,737 describes a sole for a shoe, having a plurality of first and second chambers separated by a foil between the chambers. The first chamber contains a liquid and the second fluid contains a gas. During walking, the incompressible liquid will level out pressure differences in the foot, and the liquid flow in the first chamber may vary by pressure equalisation with the gas in the second chamber.
However, this sole has the disadvantage that the pressure relief taking place is not controlled, i.e., the pressure equalisation cannot be directed towards specific parts of the foot which may need specific pressure equalisation or relief. The gas has to be contained in the chamber in order to establish a pressure equalisation at all in that known sole, but it leads to a pressure equalisation that is out of control.
Thus, there is a direct incompatibility of soles being able to equalise pressure differences in limited portions of the sole of the foot and soles being able to shock absorb or massage the foot. In order to obtain the desired pressure equalisation, the former comprise delimited chambers filled with fluid whereas in order to obtain the desired shock absorption and massage effect, the latter do precisely not comprise delimited fluid chambers but rather one large chamber in which the fluid may flow over flow barriers from one end of the sole to the other.
Consequently, it is not possible with the soles known hitherto to provide a sole that is able to provide the foot with pressure equalisation in a standing position of rest and in motion while at the same time the sole is able to provide the foot with shock absorption and a massage effect. U.S. Pat. No. 4,567.677 attempts to solve this problem by providing barriers around the middle of the sole so that the front and rear parts of the sole show similarity with delimited fluid chambers. However, this means that the various types of relief of the foot fail to be optimal since U.
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