Shoe bottom heel portion
In a shoe bottom heel portion, an upper midsole of a heel portion includes a central bulge and peripherally arranged pillars, a lower midsole includes a central mound opposing the bulge and peripherally arranged sockets receiving said pillars, and a thin, stiff shank extending rearward from the arch portion of the shoe bottom is bonded to the central bulge and to the central mound. Cavities are formed surrounding the central mound and openings are formed between the contacts. Through bending as well as compression, the upper and lower midsole and the shank cooperate to absorb impact. Optionally, the contacts are simplified and flattened. Optionally, the shank is omitted. Optionally, either of the mound and the bulge is omitted or substituted for the other.
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1. Field of the Invention
The present invention relates to footwear, more particularly to shoe bottoms for active and sport footwear, and especially to shock-absorbing heel portions.
2. Description of the Related Art
The modern consumer of sport footwear expects support, comfort and impact absorption in a tastefully ornamented product. Footwear designers have responded with products combining new materials, conspicuously displayed performance engineering features, and a profusion of new ornamental shapes, colors and textures. The Shox® brand footwear offered by the Nike Corporation and the Wave Creation® brand footwear offered by the Mizuno Corporation exemplify this response to consumer demand. As the public grows more sophisticated in its perception of footwear design features, designers will be driven toward greater refinement in how they blend mechanical and ornamental functions in every structural element of a product.
The present invention recognizes and addresses a particular need for such refinement by providing a visually appealing laminated heel shoe bottom heel portion which absorbs impact comfortably over the lifetime of the product.
SUMMARY OF THE INVENTIONIt is an object of the present invention to provide a shoe bottom heel portion with cushioning and improved durability.
In accordance with this object and with others which will be described and which will become apparent, a preferred exemplary embodiment of a shoe bottom heel portion in accordance with the present invention includes an upper midsole forming a central bulge; a lower midsole forming a central mound; a shank bonded to the central bulge and to the central mound; and a plurality of contacts of the upper midsole with the lower midsole. The contacts are arranged peripherally. Each contact includes a projection, either of the upper midsole or of the lower midsole, and also includes an indentation, in the lower or upper midsole, respectively. Each indentation receives a corresponding projection. This cooperation of the projections and indentations gives each contact a large surface area for adhesion and also reduces the likelihood of lateral displacement of the upper midsole relative to the lower midsole.
The upper midsole may have a first edge, the lower midsole may have a second edge, with the second edge at least partially surrounding and embracing the first edge to increase adhesion area between the two and to resist lateral displacement.
The contacts may be substantially permanent and may be bonded by an adhesive.
At least one of the upper midsole and the lower midsole includes an injection or compression molded portion, which may be, for example, formed of ethylene vinyl acetate (EVA) or thermoplastic urethane (TPU). In a preferred embodiment, the upper midsole is formed of EVA of approximately 65 shore C durometer hardness and the lower midsole is formed of TPU.
At least one of the contacts may include a load transferring area surrounding the indentation and the projection thereof.
The upper midsole and the lower midsole may have opposing concave forms intermediate the contacts, thereby forming peripheral openings intermediate the contacts. The openings enable the upper midsole and the lower midsole to bend and move closer together in order to cushion a wearer's footsteps.
The upper midsole and the lower midsole may have opposing concave forms proximate the central bulge and the central mound, thereby forming cavities between the upper midsole and the lower midsole. The cavities enable the upper midsole and the lower midsole to bend and move closer together in order to cushion a wearer's heel strike. The cavities may communicate with the peripheral openings at the first edge and second edge, between the contacts.
The upper midsole and the shank may extend forward beyond the lower midsole. A pair of the contacts may be located forward of the central mound, one laterally, the other medially, with the lower midsole including a front edge indented rearward from the pair of contacts to the central mound.
The shank may contact the central mound over a first surface area and contact the central bulge over a second surface area, the second surface area being at least twice, four times, or eight times the first surface area.
The central bulge may be formed of a material having a first stiffness, the central mound of a material having a second stiffness substantially greater than the first stiffness, and the shank formed of a material having a third stiffness substantially greater than the second stiffness, whereby bending is utilized to absorb impact. The central bulge may formed of 65 shore C durometer hardness EVA, the central mound of TPU, and the shank of a hard urethane resin.
Also in accordance with the invention, a first alternative embodiment of a shoe bottom heel portion includes an upper midsole forming a central bulge; a lower midsole forming a central mound; and a shank bonded to the central bulge and to the central mound. However, this first alternative embodiment does not include the pillars and sockets that were described for the preferred exemplary embodiment.
The upper midsole may have a first edge, the lower midsole may have a second edge, and the second edge may at least partially surround and embrace the first edge.
At least one of the upper midsole and the lower midsole may include an injection or compression molded portion such as a piece formed of EVA or TPU, particularly an upper midsole formed of EVA of approximately 65 shore C durometer hardness and a lower midsole formed of TPU.
The upper midsole and the lower midsole may have opposing concave forms proximate the central bulge and the central mound, the shank conforming to the upper midsole, forming at least one cavity between the upper midsole and the lower midsole The cavity may open at the first edge and second edge.
The upper midsole and the shank may extend forward beyond the lower midsole.
The upper midsole may extend forward beyond the lower midsole medially and laterally, and the lower midsole may include a front edge indented rearward centrally to the central mound.
The shank may contact the central mound over a first surface area and contact the central bulge over a second surface area, the second surface area being at least twice, four times, or eight times the first surface area.
The central bulge may be formed of a material having a first stiffness, the central mound of a material having a second stiffness substantially greater than the first stiffness, and the shank formed of a material having a third stiffness hardness equivalent to or greater than the second stiffness, whereby bending is utilized to absorb impact.
The central bulge may formed of 65 shore C durometer hardness EVA, the central mound of TPU, and the shank of a hard urethane resin.
Also in accordance with the invention, a second alternative embodiment of a shoe bottom heel portion includes an upper midsole and a lower midsole, the upper midsole having a plurality of contacts with the lower midsole, the contacts being arranged peripherally, the contacts including projections of one of the upper midsole and the lower midsole and indentations of the other of the upper midsole and the lower midsole, the indentations receive respective ones of the projections. However, this second alternative embodiment does not include the shank inset and the shank as described for the preferred exemplary embodiment, although it may optionally include the central mound and central bulge as described for that embodiment.
The upper midsole may have a first edge, the lower midsole may have a second edge, and the second edge may at least partially surround and embrace the first edge. The contacts may be substantially permanent and may be adhesive.
At least one of the upper midsole and the lower midsole may include an injection or compression molded portion, such as a piece formed of EVA or TPU, and particularly an upper midsole formed of EVA of approximately 65 shore C durometer hardness and a lower midsole formed of TPU.
At least one of the contacts may include a load transferring area surrounding the indentation and the projection thereof.
The upper midsole and the lower midsole may have opposing concave forms intermediate the contacts, thereby forming peripheral openings intermediate the contacts.
The upper midsole and the lower midsole may have opposing concave forms, one of the upper midsole and the lower midsole having a central bulge, the other thereof having a central mound opposing and proximate the central bulge, forming at least one cavity between the upper midsole and the lower midsole. The at least one cavity may open at the first edge and second edge.
The upper midsole may extend forward beyond the lower midsole. A pair of the contacts may be located forward of the central mound, one laterally, the other medially, with lower midsole including a front edge indented rearward from the pair of contacts to the central mound.
It is an advantage of the present invention that a midsole constructed of 65 shore C durometer hardness EVA, which is more durable than 55-durometer EVA but which might be uncomfortably hard in a solid shoe bottom, utilizes bending deformation to supplement compression deformation to provide resistance which gently increases with an increasing applied load. As a result, the shoe bottom is both impact-absorbing and durable.
BRIEF DESCRIPTION OF THE DRAWINGSFor a further understanding of the objects and advantages of the present invention, reference should be had to the following detailed description, taken in conjunction with the accompanying drawing, in which like parts are given like reference numbers and wherein:
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In this second alternative embodiment, the locations of the central bulge 60 and the central mound 74 may be exchanged, one or the other of them may be exaggerated or reduced, and either may be replaced by the other to provide opposing bulges or opposing mounds.
While the foregoing detailed description sets forth exemplary embodiments of a shoe bottom heel portion in accordance with the present invention, it is to be understood that the above description is illustrative only and not limiting of the disclosed invention. Indeed, it will be appreciated that the embodiments discussed above and the virtually infinite embodiments that are not mentioned could easily be within the scope and spirit of the present invention. Thus, the present invention is to be limited only by the claims as set forth below.
- shoe bottom heel portion 30
- shoe 32
- shoe upper 34
- shoe bottom 36
- forefoot portion 38
- arch portion 40
- heel portion 42
- outsole 44
- lower midsole 46
- upper midsole 48
- shank 50
- forward pillar 52
- middle pillar 54
- rear pillar 56
- inset 58
- central bulge 60
- forward adhesion area 62
- middle adhesion area 64
- rear adhesion area 66
- forward socket 68
- middle sockets 70
- rear socket 72
- central mound 74
- shank-adhering cup 76
- front edge 78
- ridges 80
- side portions 82
- rear contact 88
- middle contact 90
- forward contact 92
- lenticular openings 94
- bowl 96
- cavity 98
Claims
1. A shoe bottom heel portion, comprising of:
- an upper midsole forming a central bulge;
- a lower midsole forming a central mound;
- a shank bonded to said central bulge and to said central mound;
- and
- a plurality of contacts of said upper midsole with said lower midsole, said contacts being arranged peripherally, said contacts including projections of one of said upper midsole and said lower midsole and indentations of the other of said upper midsole and said lower midsole, whereby said indentations receive respective ones of said projections.
2. A shoe bottom heel portion as set forth in claim 1, wherein said upper midsole has a first edge, said lower midsole has a second edge, and said second edge at least partially surrounds and embraces said first edge.
3. A shoe bottom heel portion as set forth in claim 1, wherein said contacts are substantially permanent.
4. A shoe bottom heel portion as set forth in claim 1, wherein said contacts are adhesive.
5. A shoe bottom heel portion as set forth in claim 1, wherein said upper midsole and said lower midsole each includes an injection or compression molded portion.
6. A shoe bottom heel portion as set forth in claim 1, wherein said upper midsole and said lower midsole each includes a piece formed of EVA or TPU.
7. A shoe bottom heel portion as set forth in claim 1, wherein said upper midsole is formed of EVA of approximately 65 shore C durometer hardness, and said lower midsole is formed of TPU.
8. A shoe bottom heel portion as set forth in claim 1, wherein at least one of said contacts includes a load transferring area surrounding said indentation and said projection thereof.
9. A shoe bottom heel portion as set forth in claim 1, said upper midsole and said lower midsole having opposing concave forms intermediate said contacts, thereby forming peripheral openings intermediate said contacts.
10. A shoe bottom heel portion as set forth in claim 1, said upper midsole and said lower midsole having opposing concave forms proximate said central bulge and said central mound, said shank conforming to said upper midsole, thereby forming at least one cavity between said upper midsole and said lower midsole.
11. A shoe bottom heel portion as set forth in claim 10, wherein said at least one cavity opens at said first edge and second edge.
12. A shoe bottom heel portion as set forth in claim 10, wherein said upper midsole and said shank extend forward beyond said lower midsole.
13. A shoe bottom heel portion as set forth in claim 12, wherein a pair of said contacts is located forward of said central mound, one laterally, the other medially, and wherein said lower midsole includes a front edge indented rearward from said pair of contacts to said central mound.
14. A shoe bottom heel portion as set forth in claim 1, wherein said shank contacts said central mound over a first surface area, said shank contacts said central bulge over a second surface area, and said second surface area is at least twice said first surface area.
15. A shoe bottom heel portion as set forth in claim 1, wherein said shank contacts said central mound over a first surface area, said shank contacts said central bulge over a second surface area, and said second surface area is at least four times said first surface area.
16. A shoe bottom heel portion as set forth in claim 1, wherein said shank contacts said central mound over a first surface area, said shank contacts said central bulge over a second surface area, and said second surface area is at least eight times said first surface area.
17. A shoe bottom heel portion as set forth in claim 16, wherein said central bulge is formed of a material having a first stiffness, said central mound is formed of a material having a second stiffness substantially greater than said first stiffness, and said shank is formed of a material having a third stiffness substantially greater than said second stiffness.
18. A shoe bottom heel portion as set forth in claim 17, wherein said central bulge is formed of 65 shore C durometer hardness EVA, said central mound is formed of TPU, and said shank is formed of a hard urethane resin.
19. A shoe bottom heel portion, comprising of:
- an upper midsole forming a central bulge;
- a lower midsole forming a central mound; and
- a shank bonded to said central bulge and to said central mound.
20. A shoe bottom heel portion as set forth in claim 19, wherein said upper midsole has a first edge, said lower midsole has a second edge, and said second edge at least partially surrounds and embraces said first edge.
21. A shoe bottom heel portion as set forth in claim 19, wherein said upper midsole and said lower midsole each includes an injection or compression molded portion.
22. A shoe bottom heel portion as set forth in claim 19, wherein said upper midsole and said lower midsole each includes a piece formed of EVA or TPU.
23. A shoe bottom heel portion as set forth in claim 19, wherein said upper midsole is formed of EVA of approximately 65 shore C durometer hardness, and said lower midsole is formed of TPU.
24. A shoe bottom heel portion as set forth in claim 19, said upper midsole and said lower midsole having opposing concave forms proximate said central bulge and said central mound, said shank conforming to said upper midsole, thereby forming at least one cavity between said upper midsole and said lower midsole.
25. A shoe bottom heel portion as set forth in claim 23, wherein said at least one cavity opens at said first edge and second edge.
26. A shoe bottom heel portion as set forth in claim 19, wherein said upper midsole and said shank extend forward beyond said lower midsole.
27. A shoe bottom heel portion as set forth in claim 19, said upper midsole extends forward beyond said lower midsole medially and laterally, and wherein said lower midsole includes a front edge indented rearward centrally to said central mound.
28. A shoe bottom heel portion as set forth in claim 19, wherein said shank contacts said central mound over a first surface area, said shank contacts said central bulge over a second surface area, and said second surface area is at least twice said first surface area.
29. A shoe bottom heel portion as set forth in claim 19, wherein said shank contacts said central mound over a first surface area, said shank contacts said central bulge over a second surface area, and said second surface area is at least four times said first surface area.
30. A shoe bottom heel portion as set forth in claim 19, wherein said shank contacts said central mound over a first surface area, said shank contacts said central bulge over a second surface area, and said second surface area is at least eight times said first surface area.
31. A shoe bottom heel portion as set forth in claim 29, wherein said central bulge is formed of a material having a first stiffness, said central mound is formed of a material having a second stiffness substantially greater than said first stiffness, and said shank is formed of a material having a third stiffness substantially greater than said second stiffness.
32. A shoe bottom heel portion as set forth in claim 30, wherein said central bulge is formed of 65 shore C durometer hardness EVA, said central mound is formed of TPU, and said shank is formed of a hard urethane resin.
33. A shoe bottom heel portion, comprising:
- an upper midsole;
- a lower midsole; and
- a plurality of contacts of said upper midsole with said lower midsole.
34. A shoe bottom heel portion as set forth in claim 33, wherein said plurality of contacts are arranged peripherally.
35. A shoe bottom heel portion as set forth in claim 33, wherein said plurality of contacts include projections of one of said upper midsole and said lower midsole and indentations of the other of said upper midsole and said lower midsole.
36. A shoe bottom heel portion as set forth in claim 35, wherein said indentations receive respective ones of said projections.
37. A shoe bottom heel portion as set forth in claim 33, wherein said upper midsole has a first edge, said lower midsole has a second edge, and said second edge at least partially surrounds and embraces said first edge.
38. A shoe bottom heel portion as set forth in claim 33, wherein said contacts are substantially permanent.
39. A shoe bottom heel portion as set forth in claim 33, wherein said contacts are adhesive.
40. A shoe bottom heel portion as set forth in claim 33, wherein said upper midsole and said lower midsole each includes an injection or compression molded portion.
41. A shoe bottom heel portion as set forth in claim 33, wherein said upper midsole and said lower midsole each includes a piece formed of EVA or TPU.
42. A shoe bottom heel portion as set forth in claim 33, wherein said upper midsole is formed of EVA of approximately 65 shore C durometer hardness, and said lower midsole is formed of TPU.
43. A shoe bottom heel portion as set forth in claim 33, wherein at least one of said contacts includes a load transferring area surrounding said indentation and said projection thereof.
44. A shoe bottom heel portion as set forth in claim 33, said upper midsole and said lower midsole having opposing concave forms intermediate said contacts, thereby forming peripheral openings intermediate said contacts.
45. A shoe bottom heel portion as set forth in claim 42, said upper midsole and said lower midsole having opposing concave forms, one of said upper midsole and said lower midsole having a central bulge, the other thereof having a central mound opposing and proximate said central bulge, thereby forming at least one cavity between said upper midsole and said lower midsole.
46. A shoe bottom heel portion as set forth in claim 44, wherein said at least one cavity opens at said first edge and second edge.
47. A shoe bottom heel portion as set forth in claim 42, wherein said upper midsole extends forward beyond said lower midsole.
48. A shoe bottom heel portion as set forth in claim 46, wherein a pair of said contacts is located forward of said central mound, one laterally, the other medially, and wherein said lower midsole includes a front edge indented rearward from said pair of contacts to said central mound.
49. A shoe bottom heel portion, comprising:
- an upper midsole;
- a lower midsole; and
- a plurality of contacts of said upper midsole with said lower midsole, said contacts being arranged peripherally,
- said contacts including projections of one of said upper midsole and said lower midsole and indentations of the other of said upper midsole and said lower midsole, and
- said indentations receive respective ones of said projections.
50. A shoe bottom heel portion as set forth in claim 49, wherein said upper midsole has a first edge, said lower midsole has a second edge, and said second edge at least partially surrounds and embraces said first edge.
51. A shoe bottom heel portion as set forth in claim 49, wherein said contacts are substantially permanent.
52. A shoe bottom heel portion as set forth in claim 49, wherein said contacts are adhesive.
53. A shoe bottom heel portion as set forth in claim 49, wherein said upper midsole and said lower midsole each includes an injection or compression molded portion.
54. A shoe bottom heel portion as set forth in claim 49, wherein said upper midsole and said lower midsole each includes a piece formed of EVA or TPU.
55. A shoe bottom heel portion as set forth in claim 49, wherein said upper midsole is formed of EVA of approximately 65 shore C durometer hardness, and said lower midsole is formed of TPU.
56. A shoe bottom heel portion as set forth in claim 49, wherein at least one of said contacts includes a load transferring area surrounding said indentation and said projection thereof.
57. A shoe bottom heel portion as set forth in claim 49, said upper midsole and said lower midsole having opposing concave forms intermediate said contacts, thereby forming peripheral openings intermediate said contacts.
58. A shoe bottom heel portion as set forth in claim 55, said upper midsole and said lower midsole having opposing concave forms, one of said upper midsole and said lower midsole having a central bulge, the other thereof having a central mound opposing and proximate said central bulge, thereby forming at least one cavity between said upper midsole and said lower midsole.
59. A shoe bottom heel portion as set forth in claim 57, wherein said at least one cavity opens at said first edge and second edge.
60. A shoe bottom heel portion as set forth in claim 55, wherein said upper midsole extends forward beyond said lower midsole.
61. A shoe bottom heel portion as set forth in claim 59, wherein a pair of said contacts is located forward of said central mound, one laterally, the other medially, and wherein said lower midsole includes a front edge indented rearward from said pair of contacts to said central mound.
Type: Application
Filed: Aug 4, 2005
Publication Date: Feb 8, 2007
Applicant:
Inventor: Eval Akhidime (Playa del Rey, CA)
Application Number: 11/198,944
International Classification: A43B 13/18 (20060101); A43B 23/22 (20060101);