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EP-4740777-A2 - A SHOE SOLE AND A SAFETY SHOE

EP4740777A2EP 4740777 A2EP4740777 A2EP 4740777A2EP-4740777-A2

Abstract

The shoe sole (10) comprises a heel area and a ball area, an insole (14), an outsole (16) configured to come into contact with the ground, a midsole (15) between the insole and the outsole, an elastic insert (18) embedded into the midsole extending in the heel area of the sole and an anti-puncture sheet (22). The anti-puncture sheet has a front portion (24) locating between the insole and the midsole in the ball area of the sole and a rear portion (26) locating between the outsole and the elastic insert in the heel area of the shoe sole.

Inventors

  • JOKINEN, JUHA

Assignees

  • Sievin Jalkine Oy

Dates

Publication Date
20260513
Application Date
20240827

Claims (11)

  1. A shoe sole (10) comprising a heel area (11) and a ball area (12), an insole (14), an outsole (16) configured to come into contact with the ground, a midsole (15) between the insole (14) and the outsole (16), an elastic insert (18) embedded into the midsole (15) in the heel area (11) of the shoe sole (10) and an anti-puncture sheet (22), characterised in that said anti-puncture sheet (22) has a front portion (24) locating between the insole (14) and the midsole (15) in the ball area (12) of the shoe sole (10) and a rear portion (26) locating between the outsole (16) and the elastic insert (18) in the heel area (11) of the shoe sole (10).
  2. The shoe sole according to claim 1, characterised in that , said anti-puncture sheet (22) further comprises a middle portion (25) connecting the front portion (24) and the rear portion (26), which front portion (24), middle portion (25) and rear portion (26) are made of same material.
  3. The shoe sole according to claim 1 or 2, characterised in that , said anti-puncture sheet (22) is a shaped metal plate, preferably a shaped steel plate.
  4. The shoe sole according to any of the claims 1 to 3, characterised in that , the anti-puncture sheet (22) has an upper surface facing the insole (14) and a lower surface facing the outsole (16) and the front portion (24) of the anti-puncture sheet (22) is attached to the insole (14) and the rear portion (26) of the anti-puncture sheet (22) is attached to the elastic insert (18).
  5. The shoe sole according to claim 4, characterised in that , the upper surface of the front portion (24) of the anti-puncture sheet (22) is attached to the insole (14) by gluing and the upper surface of the rear portion (26) of the anti-puncture sheet (22) is attached to the elastic insert (18) by gluing.
  6. The shoe sole according to any of the claims 1 to 5, characterised in that the midsole (15) is attached to the lower surfaces of the front portion (24) and the rear portion (26) of the anti-puncture sheet (22).
  7. The shoe sole according to any of the claims 1 to 5, characterised in that , the midsole (15) is made of and attached to the anti-puncture sheet (22) by moulded polyurethane material.
  8. The shoe sole according to claim 7, characterised in that , the upper surface and the lower surface of the anti-puncture sheet (22) are covered with a primer for enhancing the attachment of the midsole to the anti-puncture sheet.
  9. The shoe sole according to any of the claims 1 to 8, characterised in that , the insole (14) has hole (28) in the heel area (11) of the shoe sole (10), the hole (28) exposing a major part of the surface of the elastic insert (18) facing the insole (14).
  10. A safety shoe comprising a shoe sole (10) according to any of the claims 1 to 9 and an upper (50) attached to the shoe sole (10).
  11. A safety shoe according to claim 10, characterised in that the upper (50) comprises a protective cap (52) covering the tip of the ball area (12) of the shoe sole (10).

Description

Technical Field The invention is related to a shoe sole comprising a heel area and a ball area, an insole, an outsole configured to come into contact with the ground, a midsole between the insole and the outsole, an elastic insert embedded into the midsole in the heel area of the shoe sole and an anti-puncture sheet. The invention is further related to a safety shoe comprising said shoe sole. Background Art Safety shoes, or anti-injury shoes, offer their users a high degree of protection against puncture wounds and crushing injuries. All safety shoes, in order to respect the current standards of the field, comprise an upper provided with a sufficiently rigid protective toe cap to withstand impacts, protecting the user's toes from crushing. Further, the safety shoes are provided with puncture resistant sheet, which prevents sharp objects, such as nails, to penetrate through the shoe sole. Safety shoes are usually used as working shoes, whereby they are intended to be worn by the user for many hours per day in activities, in which the user is in continuous movement. Therefore, the safety shoes must be to be able to ensure a satisfactory level of comfort for the user. For this purpose, many safety shoes are equipped with a layered sole comprising an insert made of elastic material. The elastic insert makes it more comfortable to stand on the floor and it provides a soft and dynamic shock absorption during walking. Although such anti-injury shoes have been successful with users and are currently very common, they are not without drawbacks. Document EP 3648628 B1 discloses a safety shoe, comprising a layered sole having an upper layer, an intermediate layer and a lower layer adapted to come into contact with the ground. In the intermediate layer an elastic insert is embedded, which extends exclusively at the rear zone of said sole. The upper layer comprises an anti-puncture sheet thoroughly covering the sole and overlapping the elastic insert. The anti-puncture sheet is preferably made of non-metallic, flexible material, apparently to preserve softness and comfort of use offered by the elastic insert. However, soft and flexible anti-puncture sheets do not provide maximum protection against punctures, whereby protection of the user's feet is compromised. Document KR 20070117233 A discloses a shock absorbing safety shoe comprising an insole, an outsole, a midsole between the insole and the outsole midsole, a protective plate installed in the midsole and a shock-absorbing member. The shock absorbing member includes a coil spring acting as an elastic body. In the heel area of the shoe the protective plate is above the shock absorbing member, which reduces the cushioning effect of the shock-absorbing member. Document WO 2021124068 A1 discloses a puncture resistant sole comprising a midsole, a shock absorbing insert and a puncture resistant sheet interposed between the insert and midsole. The sole can further comprise an inner insole above the puncture resistant sheet, which inner insole can be equipped with small ventilation holes in the forefoot area of the sole. An object of the invention is to provide shoe sole and a safety shoe, in which drawbacks relating to the prior art are reduced. The object of the invention is achieved with a shoe sole and a safety shoe, which are characterized in what is disclosed in the independent patent claims. Some preferred embodiments of the invention are disclosed in the dependent claims. Summary of the invention The shoe sole according to the invention comprises a heel area and a ball area, an insole, an outsole configured to come into contact with the ground, a midsole between the insole and the outsole, an elastic insert embedded into the midsole extending in the heel area of the shoe sole and an anti-puncture sheet. The anti-puncture sheet has a front portion locating between the insole and the midsole in the ball area of the shoe sole and a rear portion locating between the outsole and the elastic insert in the heel area of the shoe sole. In some embodiments of the shoe sole according to the invention the anti-puncture sheet further comprises a middle portion connecting the front portion and the rear portion, which front portion, middle portion and rear portion are made of same material. In some embodiments of the shoe sole according to the invention the anti-puncture sheet is a shaped metal plate, preferably a shaped steel plate. In some embodiments of the shoe sole according to the invention the anti-puncture sheet has an upper surface facing the insole and a lower surface facing the outsole and the front portion of the anti-puncture sheet is attached to the insole and the rear portion of the anti-puncture is attached to the elastic insert. Preferably, the upper surface of the front portion of the anti-puncture sheet is attached to the insole by gluing and the upper surface of the rear portion of the anti-puncture sheet is attached to the elastic insert by gluing. In some emb