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KR-102963893-B1 - Multi-Layered Shock Absorbing Sole

KR102963893B1KR 102963893 B1KR102963893 B1KR 102963893B1KR-102963893-B1

Abstract

The present invention relates to a multilayer shock-absorbing sole comprising an insole and a midsole, and more specifically, to a multilayer shock-absorbing sole having a multilayer structure capable of inhibiting the formation of a heel bone protrusion and alleviating related pain, wherein the insole (10) comprises a first layer member (12), a second layer member (13), and a third layer member (14) joined downward from above, and the hardness of the first layer member (12) is lower than the hardness of the second layer member (13) and higher than the hardness of the third layer member (14), and the midsole (20) is disposed between the insole (10) and the outsole, and comprises a support board (22) having a hardness within the hardness range of the first layer member (12).

Inventors

  • 백재근

Assignees

  • 주식회사 제이아이씨글로벌

Dates

Publication Date
20260512
Application Date
20250828

Claims (6)

  1. In a multilayer shock-absorbing sole including an insole and a midsole, The above insole comprises a first layer member, a second layer member, and a third layer member joined downward from above, and the above midsole includes a support board disposed between the insole and the outsole, wherein The hardness of the first layer member is lower than the hardness of the second layer member and higher than the hardness of the third layer member, and the support board has a hardness within the hardness range of the first layer member. The first layer member and the support board are sized to support the entire sole of the foot, and the rear ends of the second layer member and the third layer member are aligned and arranged to coincide with the rear end of the first layer member, the second layer member is smaller in size than the first layer member, and the third layer member is smaller in size than the first layer member, but has a larger size than the second layer member to support the entire second layer member. A multilayer shock-absorbing sole characterized in that the rear end of the second layer member and the total thickness of the support board are the same, the total thickness of the first layer member is thicker than the support board, and the rear end thickness of the third layer member is equal to or greater than the thickness of the first layer member.
  2. In claim 1, A multilayer shock-absorbing sole characterized in that the first layer member has a Shore hardness of 33 to 38, the second layer member has a Shore hardness of 58 to 63, the third layer member has a Shore hardness of 18 to 23, and the support board has a Shore hardness of 33 to 38.
  3. In claim 1, The size of the second layer member is 40 to 45% of the total length from the rear end to the front end of the first layer member, and A multilayer shock-absorbing sole characterized in that the size of the third layer member is 53 to 58% of the total length from the rear end to the front end of the first layer member.
  4. In claim 1, The total thickness of the first layer member is 4 to 5 mm, and The total thickness of the above support board is 2.5 to 3.5 mm, and The thickness of the second layer member is 2.5 to 3.5 mm at the rear end and gradually decreases in the shear direction, and A multilayer shock-absorbing sole characterized in that the thickness of the third layer member is 4.5 to 5.5 mm at the rear end and gradually decreases in thickness in the front direction.
  5. In any one of claims 1 to 4, A multilayer shock-absorbing sole characterized in that the insole further includes an insole cover attached to the upper surface of the first layer member, and the midsole further includes a lasting board attached to the lower surface of the support board.
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Description

Multi-Layered Shock Absorbing Sole The present invention relates to a multilayer shock-absorbing sole comprising an insole and a midsole, and more specifically, to a multilayer shock-absorbing sole for inhibiting the formation of a calcaneal protrusion and alleviating related pain. Generally, a shoe sole consists of an insole, a midsole, and an outsole. The insole is located inside the shoe and comes into direct contact with the sole of the foot, providing functions related to foot comfort and support. The outsole is a component that forms the bottom surface of the shoe and comes into direct contact with the ground, providing functions related to grip, durability, and stability. The midsole is located between the outsole and the insole and provides cushioning and shock absorption functions. However, conventional shoe soles are not suitable for inhibiting the formation of the calcaneal spur or alleviating related pain. A calcaneal spur refers to an abnormal bone growth on the underside or back of the calcaneus (heel bone), as shown in Figure 1, and is known to occur mainly in association with plantar fasciitis. In other words, if repetitive inflammation and damage occur to the plantar fascia due to various causes such as mechanical overload (e.g., excessive use of the feet due to activities like standing or walking for long periods, wearing ill-fitting or uncomfortable shoes, or high pressure on the feet due to being overweight), repetitive microtrauma, fibrotic tissue changes, and calcium deposition, it can irritate the heel bone and cause bone spurs to form, which in this case causes severe pain in the heel. Accordingly, various types of functional shoes are being developed recently to prevent plantar fasciitis or to inhibit the formation of heel bone protrusions. As an example, Korean Patent Registration No. 10-2013672 (Patent Document 1) proposes a shoe for relieving and treating plantar fasciitis pain, comprising: a sole formed of a synthetic resin material with a first space formed on one side of the upper surface; a midsole formed of a synthetic resin material, having a second space formed by forming a hole in the same shape in a portion corresponding to the first space of the sole, having an elastic support member formed integrally by injection molding in a mesh shape in the second space, wherein the elasticity on the outer side is stronger than the elasticity on the inner side, and a round arch member protruding in a portion corresponding to the arch of the foot; and an upper forming an exterior that is bonded between the bottom edge of the midsole and the sole. In addition, Korean Patent Publication No. 2023-0076465 describes an upper sheet; a non-slip fabric layer attached to the upper surface of the upper sheet to suppress slipping of the foot; and a lower sheet attached to the lower surface of the upper sheet to form a plurality of air chambers and air passages. An air insole is proposed comprising a plurality of cushioning members attached to the lower surface of the upper sheet and each disposed within the plurality of air chambers, wherein the plurality of air chambers include a first air chamber extending from the forefoot to the heel and a second air chamber disposed in the inner arch portion of the foot, wherein the first air chamber and the second air chamber are formed between the upper sheet and the lower sheet, and the first air chamber includes a first area disposed at the forefoot, a third area disposed at the heel, and a second area connecting the first area and the third area and connected to the second air chamber through the air passage, and the plurality of cushioning members include a first cushioning member disposed in the third area and a second cushioning member disposed in the second air chamber. However, these conventional technologies have structural problems, such as low productivity due to the difficulty of manufacturing caused by the complex structure of the shoe sole, and failure to function properly if air leaks from the air chamber. Figure 1 is an X-ray image showing an example of calcaneal process development. FIG. 2 is an exploded perspective view of a multilayer shock-absorbing sole according to the present invention. FIG. 3 is an overall perspective view of a multilayer shock-absorbing sole according to the present invention. Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the exemplary drawings. In assigning reference numerals to the components of each drawing, the same components may have the same reference numeral as much as possible, even if they are shown in different drawings. Furthermore, in describing the embodiments, if it is determined that a detailed description of related known components or functions may obscure the essence of the technical concept, such detailed description may be omitted. Where terms such as "comprising," "having," or "consisting of" are used in this specification, other parts