US2067240A - Corrective insole for shoes - Google Patents

Description

CORRECTIVE INSOLE FOR SHOES Filed July 13, 1954 a l? v I INVENTOR.

GEORGE 5 Masfaeex,

e. E. MUSEBECK 2,067,240 I ATTORNEYS.

atented Jan. 12, 1937 CORRECTWE INSOLE FOR SHOES poration Application July 13, 1934, Serial No. 734,882

3 Claims.

This invention relates to an insole for shoes adapted to correct pronation or inrolling of the foot due to weakened muscular development.

In my prior patent, No. 1,916,198, issued July 4, 1933, and my co-pending application, Serial No.

720,408, filed Apri1 13, 1934, I have described constructions designed to effect the same purpose by placing a corrective pressure beneath the inner edge of the foot. In the majority of cases I have found that the pronation can best be overcome by placing the corrective pressure at the inner side of the heel rather than beneath the-instep of the foot. Manyof the blood vessels and nerves supplying the foot pass through the spaces between the bones of the instep and thus render the instep peculiarly sensitive to unnatural pressures. The region of the os calcis, on the other hand, is particularly free from such blood vessels and nerve channels so that corrective pressure may be applied beneath the same with a minimum of interference with blood supply and nerves. When the os calcis is supported in proper position by this means, the remainder of the foot assumes its normal position in a natural manner.

In the present invention this result is attained by constructing the insole of the shoe of relatively thick leather and reducing the thickness of the outer edge of the heel portion, leaving the shank of uniform thickness. The greater thickness of the inner side of the heel portion places the necessary corrective pressure at that point for straightening up the os calcis. For more severe cases of pronation, an extension is formed upon the insole similar to the common arch support extension except that it is placed in the zone of the heel rather than of the instep.

The full nature of the invention will be understood from the accompanyingdrawing and the following description and claims:

Fig. 1 is a view of the bottom of an insole having the above mentioned extension formed thereon. Fig. 2 is a similar view of an insole without extension. Fig. 3 is a sectional view taken on the line 3-3 of Fig. 1. Fig. 4 is a similar sectional view on the line i--4 of Fig. 1. Fig. 5 is a sectional view on the line 5-5 of Fig. 2. Fig. 6 is a sectional view of a completed shoe having the insole of Fig. 1 applied thereto. The section is taken immediately ahead of the heel and looking line of a normal insole I l to the edge of the extension. The outer side of the heel is reduced in thickness over an area bounded by the line I5. It will be seen that this area extends into the shank portion of the insole only far enough to insure relief beneath the forward part of the heel so that the entire os calcis region may be properly supported. The insole is preferably constructed of relatively thick leather (about three-sixteenths of an inch) so that the relief of the outer edge of the heel produces an appreciable difference in thickness between the inner and outer portions thereof. A slash 16 cut through the heel portion from the outer edge nearly to the inner side of the heel improves flexibility in a well known manner without destroying the corrective effect of the insole.

In Figs. 2 and 5, there is shown an insole of the same type without the extension. In these figures reference numerals in the series refer to parts having like constructions and functions to those in the unit series of Figs. 1, 3 and 4.

In Fig. 6, the insole of Fig. 1 is shownassembled in a complete shoe. In this view there are shown the heel l'l, outsole I8, upper l9 and insole H] which may be secured together in any well known manner. The extension l3 lies against the inner surface of the upper and serves to give an added corrective pressure to the foot when such is necessary. The reduced thickness of the extension gives it sufficient flexibility to assume its desired position.

In the use of the shoe, the difference in thickness between the inner and outer parts of the heel portion cause a corrective pressure to be applied at the outer side of the heel which forces the os calcis to assume its natural position when the muscles themselves are too weak to accomplish the purpose. Furthermore, this pressure is applied in a region where there is no interference with blood supply or nerve channels.

While the invention has been particularly described in some detail, the exact form thereof may be varied without departing from the scope of the invention as defined by the appended claims. For example, the invention is not limited to the welt type of shoe but may be used with shoes manufactured by any of the known methods.

The invention claimed is;

1. A corrective insole for shoes having the portion beneath the outer side of the heel and a small adjacent part of the shank portion reduced to less thickness than that beneath the inner side of the heel, and having the remainder of the shank portion of a substantially uniform thickness substantially equal to that 02 the unredueed portion of the heel, whereby a maximum correc tive pressure is applied at the forward inner part at the heel.

2. A corrective insole fer shees formed at rela tively thick material and the heel pertien and a small adjacent part of the shank portien having their maximum thickness at the inner side and. their minimum thickness at the outer side, the remainder of the shank portion being of a suh= stantially uniform thickness substantially equal to the maximum thickness of the heel portion, whereby a maximum corrective pressure is applied at the ferward inner part at the heel.

aeeaaee tion being of a substantially 'uniform thickness substantially equal to the maximum thickness e5.

the heel portion, and the extension having its maximum wielth adjacent the breast of the heel s GEORGE E. MUSEBECEQQ

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