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Publication numberUS20040068891 A1
Publication typeApplication
Application numberUS 10/313,218
Publication dateApr 15, 2004
Filing dateDec 6, 2002
Priority dateOct 11, 2002
Also published asCN2580796Y, DE20305000U1
Publication number10313218, 313218, US 2004/0068891 A1, US 2004/068891 A1, US 20040068891 A1, US 20040068891A1, US 2004068891 A1, US 2004068891A1, US-A1-20040068891, US-A1-2004068891, US2004/0068891A1, US2004/068891A1, US20040068891 A1, US20040068891A1, US2004068891 A1, US2004068891A1
InventorsGuohua Wang
Original AssigneeGuohua Wang
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Shoe with elastic sole
US 20040068891 A1
Abstract
A shoe with elastic sole is disclosed. The shoe comprises an inner sole, an outer sole, an upper, and an elastic sole comprising a U-shaped cavity that has openings at the two lateral sides of the sole and a U-shaped spring pad made of carbon fiber plate provided in the cavity and between the inner sole and outer sole forming a highly elastic sole structure. A U-shaped spring tab is added to the core of the U-shaped portion of the U-shaped spring pad. Alternatively, the openings of the cavity at the two lateral sides of the sole can be closed, forming a totally enclosed cavity structure. Additionally, another U-shaped cavity with a U-shaped spring pad can be provided in the anterior portion of the sole, thus forming a sole structure with U-shaped spring pads both in the anterior and heel portion of the sole. A ventilation structure is provided between the inner sole and the outer sole. The vent structure comprises ventilation holes in the lateral and rear sides of the U-shaped cavity with check intake valves provided therein, and a ventilation hole in the front side of the U-shaped cavity with a check exhaust valve provided therein. The shoe has the advantages of large deformation and high elasticity during use that can provide comforts and forced ventilation with its simple structure that is suitable for manufacture by the footwear industry.
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Claims(21)
What is claimed is:
1. A shoe with elastic sole comprises an inner sole, an outer sole, an upper, and an elastic sole that comprises:
a high elastic sole structure comprising a U-shaped cavity with openings at the two lateral sides and a U-shaped spring pad provided between the inner sole and the outer sole, forming a high elasticity sole with high elasticity structure.
2. A shoe with elastic sole according to claim 1, wherein said U-shaped spring pad comprises an upper and a lower plate in which a U-shaped portion is provided at the intersection of the upper and lower plates.
3. A shoe with elastic sole according to claim 2, wherein a U-shaped spring tab is added to the core of the U-shaped portion in the U-shaped spring pad.
4. A shoe with elastic soles according to claims 1, 2, or 3, wherein the openings at the two lateral sides of the U-shaped cavity in the heel portion of the sole are totally enclosed, forming a totally enclosed heel structure.
5. A shoe with elastic sole according to claim 4, wherein another U-shaped cavity with openings at the two lateral sides is provided in the anterior portion of the inner sole, comprising a U-shaped spring pad that is integrally connected between the inner sole and the outer sole, thus forming a sole structure with U-shaped spring pads provided both in the anterior and heel portion of the sole.
6. A shoe with elastic soles according to claim 5, wherein the openings at the two lateral sides of the U-shaped cavity in the anterior portion of the sole is also totally enclosed, forming a totally enclosed sole structure in the anterior portion of the sole.
7. A shoe with elastic soles according to claim 6, wherein the U-shaped spring pad may be integrally formed with the inner sole and the outer sole, or separately bonded together to form an integral elastic sole structure.
8. A shoe with elastic sole according to claim 7, wherein the U-shaped spring pads in the U-shaped cavities in the heel and anterior portion of the shoe may comprise one set of the U-shaped spring pads or multiple sets including at least two sets of the U-shaped spring pads.
9. A shoe with elastic soles according to claim 8, wherein a ventilation structure is provided between the inner sole and the outer sole, and said ventilation structure is formed by the U-shaped cavity of enclosed structure between the inner sole and outer sole of the heel constituting a totally enclosed air bag structure of the heel and also at least a ventilation hole is provided at the peripheral side of the heel with at least a ventilation hole in the front part of the U-shaped cavity, while several sub-ventilation holes are provided in the peripheral sides of the inner sole and outer sole and some ventilation holes provided in the sole corresponding to the inner sole and the sub-ventilation holes in which the ventilation hole, sub-ventilation holes and the ventilation holes in the soles are communicated.
10. A shoe with elastic sole according to claim 9, wherein at least one outnumbered check intake valve is provided at the ventilation hole of the heel portion in the totally enclosed U-shaped cavity and at least one check exhaust valve is provided at the ventilation hole in the front side of the side U-shaped cavity.
11. A shoe with elastic sole according to claims 1,2, or 3, wherein a curved part is provided in the intersection of the upper plate of the elastic pad and the U-shaped part.
12. A shoe with elastic sole according to claim 10, wherein a curved part is provided in the intersection of the upper plate of the elastic pad and the U-shaped part.
13. A shoe with elastic sole according to claim 12, wherein the thickness of the longitudinally outer side of the upper plate h1 is greater than the thickness of the longitudinally inner side of the upper plate and a number of raised reinforced ribs is provided on the upper surface thereof.
14. A shoe with elastic sole according to claim 13, wherein at least one of the multiple longitudinal reinforced ribs is further provided on the bottom surface of the upper, or at least one of the longitudinal reinforced ribs is further provided in the upper surface of said lower plate wherein both ribs can be provided either separately or simultaneously.
15. A shoe with elastic sole according to claim 14, wherein the U-shaped spring pad is made of composite material that can be either a single layer plate or plate having at least more than 2 layers.
16. A shoe with elastic soles according to claim 15, wherein the composite material of the U-shaped spring pad is made of carbon fiber plate that can be either a single layer plate or plate having at least more than 2 layers.
17. A shoe with elastic sole according to claim 14 is characterized in that the U-shaped spring pad is made of spring steel plate that can be either a single layer plate or plate having at least more than 2 layers.
18. A shoe with elastic sole according to claims 1, 2, or 3, wherein the tail of the lower plate of the U-shaped spring pad is further connected with another U-shaped spring pad forming a bidirectional structure of the U-shaped spring pad.
19. A shoe with elastic sole according to claim 17, wherein the tail of the lower plate of the U-shaped spring pad is further connected with another U-shaped spring pad forming a bi-directional structure of the U-shaped spring pad.
20. A shoe with elastic sole according to claim 17, wherein a wavy spring is provided at the tail of the lower plate of the U-shaped spring pad. The two ends of the wavy spring are connected to the upper and the lower plates of the U-shaped spring pad respectively.
21. A shoe with elastic sole according to claim 17, wherein an elastic material is provided between the lower and the upper plates of the U-shaped spring pad.
Description
BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a shoe with elastic sole for personnel and daily use, and in particular, a shoe with elastic sole.

[0003] 2. Background of the Invention

[0004] With the improvement of the living conditions and change of life style, people are continuously seeking more comforts of shoes for daily use. Particularly, because people are attaching more and more importance to health improving exercises, there is a need for a kind of shoe that has a sole that can provide good cushioning during the course of health improving exercises. In order to satisfy such requirement, the footwear industry has developed numerous shoes of different kinds, mostly athletic shoes, which have spring cushioned soles to make the shoes comfortable to wear during normal walking and health improving exercises.

[0005] Existing shoes with elastic soles have witnessed changes of structures on various aspects depending on different mechanisms attempted by inventors. The firstly appeared shoes with elastic soles were made of foam materials to form an elastic sole structure to reduce the impact. However, the soles of such kinds of shoes are mostly made of soft and flexible materials that have limited elastic effect, which can hardly satisfy the requirement for a shoe with high elastic effect. Especially, after a period of use, the soles of such kind of shoes made of soft and flexible materials will lose the elastic effects because of wear, making it inconvenient and not practical to use.

[0006] Later, the footwear industry has developed shoes with elastic soles that have a full elastic structure. A typical of these kinds of shoes with full elastic soles that can be found in the market is a shoe with a spring element in the sole, as shown in FIG. 8. Said shoe 10 with a spring element includes an inner sole 101, an outer sole 102 and an upper 103. A cavity 107 and another cavity 108 that are opened at two longitudinal sides of the sole are provided in the arch and heel portion of the sole respectively. Within cavity 107 and 108, column springs 104, 105, and 106, which are enclosed by rubber encasements 04A, 105A and 106A for protection, are provided between the inner sole 101 and outer shoe 102 respectively. This kind of shoe has a better elasticity compared with the above said soft sole shoes. However, because such elasticity is achieved by a very complicated mechanism such as column springs, it is difficult to produce and will result in high costs. At the same time, said shoe is difficult to maintain and repair due to its complicated structure. Obviously, there is really a need for improvement of this kind of shoe because it is not suitable for mass production by the footwear industry.

[0007] Another kind of shoe that has elastic plastic cubes inserted in the sole has been developed. A typical example is a type of elastic soled shoe produced and merchandised by Adidas, as shown in FIG. 9, which is a side view of such shoe 20 that has a elastic sole. Shoe 20 comprises an inner sole 201, an outer sole 207, and an upper 205. Two elastic plastic cubes 203 and 204 are provided between the upper part and lower part of a U-shaped plastic pad that is located within a cavity in the heel portion of the sole between inner sole 201 and outer sole 207. The spring effect of the sole is achieved by elastic plastic cubes 203 and 204. Comparing with the above said shoe that has a sole with spring element, this kind of shoe with elastic plastic cubes has the following defects that has been found during use by the wearer:

[0008] 1. Said shoe produce low elasticity or spring effect because elasticity of said shoe is achieved by elastic plastic cubes 203 and 204, which do not provide high elasticity as required by the wearer. Obviously, there is room for further improvement.

[0009] 2. Said shoe has a complicate sole structure that will result in relatively higher cost to produce. Elastic plastic cubes 203 and 204 are affixed between upper and lower parts of the U-shaped plastic pad 202, which are in turn affixed between the inner sole and the outer sole within the cavity 206. So such sole structure is difficult to produce and results in high production costs. In addition, said sole structure can be damaged by the impact by the motion of the foot of the wearer after some time of use, making it difficult to repair. Obviously, there is room for further improvement.

[0010] All of the above mentioned different kinds of shoes with elastic soles offer improvements in the elastic structures of the soles of the shoes. Although such kinds of elastic structures can achieve some elasticity to the soles as attempted by the inventor, they do not satisfy the needs for high elasticity, which is obviously caused by imperfection of the design of the previous elastic sole structures.

[0011] In order to provide a shoe that has a high elastic sole, the footwear industry has been racking their brains to find out a satisfactory solution without any practical results. Conventional shoes with elastic soles do not have an effective high elastic structure, which is obviously a problem remaining to be solved as soon as possible. As can be seen from the above, there are still many defects of the existing shoes with elastic soles that demand prompt solution.

[0012] In view of the structural imperfection of shoes with elastic soles that cannot provide high elastic function, I invented the present kind of shoe with high elastic sole based on my rich knowledge and experience after repeated trials and improvements.

SUMMARY OF THE INVENTION

[0013] One object of the present invention is to overcome the defects of the soles of the existing shoes with elastic soles, and to provide a shoe with high elastic sole to provide comforts to a wearer.

[0014] Another object of the present invention is to provide a shoe with an elastic sole that can provide not only high elasticity to the soles, but can also be used by the wearer for a considerably long period of time without undesired deformation, thus enhancing durability and practicability of the shoe.

[0015] Yet another object of the present invention is to provide a shoe with elastic sole that has an simple structure and is easy to produce in low cost, thus making it suitable for extensive adoption by the footwear industry.

[0016] A still further object of the present invention is to provide a shoe with an elastic sole that can minimize the discomforts suffered by a wearer during health improving exercises so that it can further satisfy the wearer by improve the performance of the wearer and fully exert his athletic potential during health improving exercises.

[0017] The objects of the present invention are achieved by a shoe with elastic sole that includes an inner sole, an outer sole, an upper, and an elastic sole. The shoe is characterized in that a high elastic sole structure is formed by a U-shaped cavity having openings at the lateral sides in the heel portion of the sole, in which a U-shaped spring pad is provided between the inner sole and the outer sole.

[0018] The objects of the present invention and the technical solutions achieved by the present invention can be further achieved by the following technical measures:

[0019] The aforesaid shoe with elastic sole, wherein the U-shaped spring pad comprises upper and lower plates in which a U-shaped portion is provided at the intersection of the upper and lower plates.

[0020] The aforesaid shoe with elastic sole, wherein a U-shaped spring tab is added to the core of the U-shaped portion to improve the elastic strength and durability of the curving portion of the U-shaped spring pad.

[0021] The aforesaid shoe with elastic sole, wherein the openings at the two lateral sides of the U-shaped cavity in the heel portion of the sole are totally enclosed, thus forming a totally enclosed heel structure.

[0022] The aforesaid shoe with elastic sole, wherein another U-shaped cavity with openings at the two lateral sides of the sole is provided in the anterior portion of the sole, and a U-shaped spring pad is integrally connected between the inner sole and the outer sole, thus forming a sole structure with U-shaped spring pads provided both in the anterior and heel portion of the sole to provide the sole with much higher elasticity.

[0023] The aforesaid shoe with elastic sole, wherein the U-shaped cavity at the anterior portion of the inner sole can also be a totally enclosed structure, forming a totally enclosed structure in the anterior portion of the sole.

[0024] The aforesaid shoe with elastic sole, wherein the U-shaped spring pad can be integrally formed with the inner sole and the outer sole, or separately bonded together to form an integral structure.

[0025] The aforesaid shoe with elastic sole, wherein the U-shaped spring pads in the U-shaped cavities in the heel and anterior portion of the shoe may comprise one set of the U-shaped spring pads or multiple sets including at least two sets of the U-shaped spring pads.

[0026] The aforesaid shoe with elastic sole, wherein a ventilation structure is provided between the inner sole and the outer sole, and said ventilation structure is formed by the U-shaped cavity of enclosed structure between the inner sole and outer sole of the heel constituting a totally enclosed air bag structure of the heel and also at least a ventilation hole is provided at the peripheral side of the heel with at least a ventilation hole in the front part of the U-shaped cavity, while several sub-ventilation holes are provided in the peripheral sides of the inner sole and outer sole and some ventilation holes provided in the sole corresponding to the inner sole and the sub-ventilation holes in which the ventilation hole, sub-ventilation holes and the ventilation holes in the soles are communicated to achieve ventilation.

[0027] The aforesaid shoe with elastic sole, wherein at least one outnumbered check intake valve is provided at the ventilation hole of the heel in the enclosed U-shaped cavity and at least one check exhaust valve is provided at the ventilation hole of the front part of the U-shaped cavity to achieve better elasticity and forced ventilation.

[0028] The aforesaid shoe with elastic sole, wherein a curved part is provided in the intersection of the upper plate of the elastic pad and the U-shaped portion.

[0029] The aforesaid shoe with elastic sole, wherein the thickness of the longitudinally outer side of the upper plate h1 is greater than the thickness of the longitudinally inner side of the upper plate h2, or more numbers of raised reinforced ribs can be provided on the upper surface thereof.

[0030] The aforesaid shoe with elastic sole, wherein the upper plate has at least one of the multiple longitudinal reinforced ribs in the bottom, or at least one of the longitudinal reinforced ribs provided in the upper surface of the lower plate wherein both ribs can be of separate structure or provided simultaneously.

[0031] The aforesaid shoe with elastic sole, wherein the U-shaped spring pad is made of composite material that can be a single layer plate or a plate having at least more than 2 layers.

[0032] The aforesaid shoe with elastic sole, wherein the composite material of the U-shaped spring pad is carbon fiber plate which may be formed of one layer or at least more than 2 layers.

[0033] The aforesaid shoe with elastic sole, wherein the U-shaped spring pad is made of spring steel plate that can be formed by one layer or at least more than 2 layers.

[0034] The aforesaid shoe with elastic sole, wherein the tail of the lower plate of the U-shaped spring pad is connected with a U-shaped spring pad forming a bi-directional structure of the U-shaped spring pad.

[0035] The aforesaid shoe with elastic sole, wherein a wavy spring is provided at the tail of the lower plate of the U-shaped spring pad. The two ends of the wavy spring are connected to the upper and the lower plates of the U-shaped spring pad respectively.

[0036] The aforesaid shoe with elastic sole, wherein an elastic material is provided between the lower and the upper plates of the U-shaped spring pad.

[0037] The present invention has prominent advantages and produces effective results compared with prior art. From the above-mentioned technical solution one can see that this invention is suitable for extensive application by the footwear industry because it can produce the effects of high elastic deformation and high elasticity with its simple structure. More detailed description of the advantages of the present invention is given below.

[0038] 1. A high elasticity sole is provided by a high elasticity structure formed by a U-shaped spring pad located within a U-shaped cavity in the heel portion of a shoe. Unlike the existing shoes with elastic soles that lack practical applicability because of its small elastic deformation, the present sole can produce high elastic deformation during use, making it comfortable to wear.

[0039] 2. The present invention has a variable structure that can absorb and exhaust sweat of the foot of the wearer, providing a multifunction of ventilation and high elasticity. The present invention can fully exert potential of the wearer and improve work efficiency because the shoe keeps the feet of the wearer enjoyably dry and comfortable to use, while minimize discomforts of the wearer during walking or exercises.

[0040] 3. The elasticity strength of the curved part of the U-shaped spring pad can be reinforced be adding a U-shaped spring tab to the core of the U-shaped portion, which provides durability and applicability because it will not produce permanent deformation even after a long period of use.

[0041] 4. A more highly elasticity to the sole can be achieved by providing the U-shaped spring pads both in the anterior portion and the heel portion of the shoe, making it more applicability and more satisfy the requirement of the wearer by providing better choices to the wearer.

[0042] 5. A ventilation structure is added between the inner sole and outer sole by providing at least one vent hole in the peripheral sides of the heel portion of the sole and providing at least one vent hole in the front side of the U-shaped cavity to have the effects of ventilation and exhaust.

[0043] 6. Check intake valves and check exhaust valves can be provided to the vent holes in the peripheral sides of the heel portion of the sole and in the front side of the U-shaped cavity respectively, making the sole has a even more better elasticity and forced ventilation and exhausting.

[0044] 7. The tail of the lower plate of the U-shaped spring pad can be connected with another U-shaped spring pad to form a double way U-shaped spring pad, further increasing the elasticity of U-shaped spring pad to make reciprocating motion of the elastic shoe more smooth.

[0045] 8. Or a wavy spring can be provided at the tail of the lower plate of the U-shaped spring pad. The two ends of the wavy spring are connected to the upper and the lower plates of the U-shaped spring pad respectively.

[0046] 9. Or an elastic material can be provided between the lower and the upper plates of the U-shaped spring pad.

[0047] 10. The present invention can be easily produced with low cost because of its simple structure, which is suitable for extensive application by the footwear industry.

[0048] 11. The present invention can fully satisfy the requirements of the footwear industry in its simple structure, applicability and cost effectiveness. The present invention do possess novelty because it discloses an new structure that has never been publicly disclosed in publications or publicly used or made known to the public or can be found in the market.

[0049] 12. The structure of the present invention has technical advances compared with existing elastic sole. Its unique structural features and functions produce more applicability and promoted effects, which are more superior to the existing elastic soles, therefore, the present invention possesses inventiveness.

[0050] As indicated above, the present invention of the shoe with the unique elastic sole structure, which possesses the above-mentioned advantages, has never been disclosed or used by prior art. The present invention is really a novel, progressive, and applicable new design with its great improvement in structure and function.

[0051] The above description is only a summary of the present invention. In order to make a person skilled in the art have better understanding of the technical measures of the present invention and carry in execution of the present invention according to this specification, a detailed description of one embodiment of the present invention is given below with the help of the drawings.

[0052] Detailed implementation of the present invention is described in the following drawings and examples of several embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

[0053]FIG. 1 is a side view of the shoe with elastic sole according to the present invention, with parts cut away.

[0054]FIG. 2 is a side view of an alternate shoe with elastic sole according to the present invention, with parts cut away.

[0055]FIG. 3 is a bottom view of the shoe with elastic sole shown in FIG. 2, with parts cut away from A-A side of FIG. 2.

[0056]FIG. 4 is a side view of an alternate spring pad according to the present invention.

[0057]FIG. 5 is a longitudinal side view of the spring pad shown from the A side in FIG. 4.

[0058]FIG. 6 is a top view of the spring pad shown from the B side in FIG. 5

[0059]FIG. 7 is a side view of an alternate spring pad according to the present invention.

[0060]FIG. 8 is a side view of an alternate spring pad according to the present invention.

[0061]FIG. 9 is a side view of an alternate spring pad according to the present invention.

[0062]FIG. 10 is a side view of an alternate spring pad according to the present invention.

[0063]FIG. 11 is a side view of an alternate spring pad according to the present invention.

[0064]FIG. 12 is a side view of a shoe with spring sole according to an existing invention, with spring assembly cut away.

[0065]FIG. 13 is a side view of a shoe with elastic plastic cubes according an existing invention, with the elastic structure cut away.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0066] Details about method of execution, structure, features, and functions of embodiments of the present invention are given below with the help of the drawings.

[0067]FIG. 1 shows one embodiment of the present invention. Shoe 1 comprises an inner sole 11, an outer sole 12 and an upper 13. A U-shaped cavity 14 with openings at the two lateral sides is provided in the heel portion of the shoe, in which a U-shaped spring pad 15 is located between the inner sole 11 and outer sole 12. A shoe with high elastic sole can be achieved by the high elastic structure formed by the U-shaped spring pad 15, which is structurally simple and easy to produce.

[0068]FIG. 1 and FIG. 2 show one embodiment of the present invention. The U-shaped spring pad 15 includes an upper plate 151 and a lower plate 152, in which a U-shaped portion 153 is provided at the intersection thereof. In order to enhance the elasticity and to increase durability of the present invention, a U-shaped spring plate is provided in the core of the U-shaped portion 153 of the spring pad 15 to enhance the elastic strength of the curved section of the U-shaped pad 15.

[0069] The U-shaped cavity 14 may also be closed at the two lateral sides (the enclosed U-shaped cavity can not be illustrated by the drawing because the drawing is a side view with U-shaped portion cut away; so the drawing only illustrates the U-shaped cavity with openings at the two lateral sides), thus forming a totally enclosed U-shaped chamber 15, which can ensure safety of the heel portion during use and prevent foreign maters such as dust and debris from entering into the heel structure. The totally enclosed structure can also enhance applicability and generate an aesthetic appearance to the shoe.

[0070]FIG. 2 shows another embodiment of the present invention, which, in order to further enhance elasticity of the sole, includes another U-shaped cavity 16 having openings at the two lateral sides in the anterior portion of the sole. Within the U-shaped cavity 16, a U-shaped spring pad 17 is integrally affixed to the inner sole 11 and outer sole 12, which can further enhance elasticity of the sole, thus forming a elastic sole with U-shaped spring pads both in the anterior and heel portion of the sole that provides a much higher elasticity.

[0071] Similarly, The U-shaped cavity 16 may also be closed at the two lateral sides (the enclosed U-shaped cavity can not be illustrated by the drawing because the drawing is a side view with U-shaped portion cut away; so the drawing only illustrates the U-shaped cavity with openings at the two lateral sides), thus forming a totally enclosed U-shaped chamber 16

[0072] Said U-shaped spring pad 15 can be integrally formed with the inner sole 11 and the outer sole 12, or separately bonded together to form an integral structure.

[0073] The U-shaped spring pad 15 in the U-shaped chamber 14 in the heel and the U-shaped spring pad 17 in the U-shaped chamber 16 in the anterior portion of the shoes may be provided with one set of the U-shaped spring pad or multiple sets including at least two sets of the pads respectively, thus further improving the structure thereof.

[0074] Referring to FIG. 1, FIG. 2, and FIG. 3, FIG. 3 shows the ventilation structure of the present invention. The ventilation structure 18 is provided between the inner sole and the outer sole, and said ventilation structure is formed by the enclosed U-shaped cavity 14 between the inner sole 11 and outer sole 12 of the heel constituting a totally enclosed air bag structure of the heel and also at least a ventilation hole 181 is provided at the peripheral side of the heel with at least a ventilation hole 182 in the front part of the U-shaped cavity 14, while several sub-ventilation holes 183 are provided in the peripheral sides of the inner sole 11 and outer sole 12 and some ventilation holes 184 (illustrated by dotted lines in FIG. 3) provided in the sole corresponding to the sub-ventilation holes 183 in which the ventilation hole 182, sub-ventilation holes 183 and the ventilation holes 184 in the soles are communicated. When the inner sole 11 is pressed down to deform by the wearer, parts of the air inside the air bag formed by the U-shaped chamber 14 will be discharged to the outside through sub-ventilation holes 183, while at the same time, sweat of the foot will be discharged to the outside together with the air through ventilation holes 184, making the shoe have the advantages of forced ventilation and better elasticity.

[0075] In order to have a much better ventilation and elasticity, at least one check intake valve 1811, 1812, and 1813 can be provided at the ventilation hole of the heel in the enclosed U-shaped cavity 14 and at least one check exhaust valve is provided at the ventilation hole 182 of the front part of the U-shaped cavity 14. When the wearer lift up his foot, the inner sole 11 will also lift up due to the elastic force of the U-shaped spring pad 15, thus making the outside air flow into the air bag structure formed by the U-shaped chamber 14 through check intake valve 1811, 1812, and 1813. When the inner sole 11 and the U-shaped spring pad 15 is pressed down to deform by the wearer, the check intake valves 1811, 1812, and 1813 will close, thus making the air inside the air bag formed by the U-shaped chamber 14 discharged to the outside only through ventilation hole 182 and sub-ventilation holes 183, while at the same time, sweat of the foot will be discharged to the outside together with the air through ventilation holes 184, making the shoe have the advantages of forced ventilation and better elasticity.

[0076]FIG. 4 shows another embodiment of the present invention, which has a similar structure to that of the first embodiment. The difference is that a curved portion 154 is provided at the intersection between the upper plate 151 and the U-shaped portion 153, thus avoiding fatigue breakdown of the U-shaped portion 153 after repeated use, while at the same time deformation of the curved portion 154 can neutralize the deformation displacement of the upper plate 151 during use, thus making the reciprocating motion of the upper plate 151 more smooth, and further enhancing the elastic strength of the U-shaped spring pad.

[0077] Referring to FIG. 5 and FIG. 6, the thickness h1 of the outer side of the upper plate 151 is greater than the thickness h2 of the inner side of the upper plate 151, so that the center of gravity of the wearer will be kept to the center of the sole, or more numbers of raised reinforced ribs 1511 can be provided on the upper surface of said upper plate 151, which can achieve same result.

[0078] Referring to FIG. 5, the upper plate 151 can be provided with at least one of the multiple longitudinal reinforced ribs 1512 in the bottom, or at least one of the longitudinal reinforced ribs 1521 in the upper surface of the lower plate 152 wherein both ribs can be of separate structure or provided simultaneously. Strength of the upper plate 151 and lower plate 152 can be enhanced by the more numbers of the longitudinal reinforced ribs, thus strength of the U-shaped spring pad 15 can be further enhanced.

[0079]FIG. 7 shows yet another embodiment of the present invention, which has a similar structure to that of the second embodiment of the present invention. The difference is that the tail of said lower plate 152 can be connected with another U-shaped spring pad 156 forming a bi-directional structure of the U-shaped spring pad. The structure of the U-shaped spring pad 156 can be same to that of said U-shaped spring pad 15; therefore it is unnecessary to go in to details. This structure will provide further more elasticity and more smoothness of the reciprocating motions of the elastic sole because the elastic force of the U-shaped spring pad 15 is further more enhanced.

[0080] Said U-shaped spring pad 15 of the present invention can be made of composite material which can be a single layer plate or plate having at least more than 2 layers. Carbon fiber plate is preferred for embodiments of the present invention. The carbon fiber plate that may be of one layer or at least more than 2 layers. Said U-shaped spring pad 15 may be also made of spring steel plate which can be of one layer or at least more than 2 layers depending on requirement for different elasticity.

[0081] Referring to FIG. 8, FIG. 9, FIG. 10, and FIG. 11, in another embodiment of the present invention, a wavy spring is provided at the tail of the lower plate of said U-shaped spring pad 15. The two ends of the wavy spring are connected to the upper and the lower plates of the U-shaped spring pad respectively (as shown in FIG. 9). In yet another embodiment of the present invention, an elastic material such as silica gel can also be provided between the lower and the upper plates of said spring pad (as shown in FIG. 11).

[0082] The above detailed description of the invention are only examples of several preferred embodiments, they should not be construed as limitations on the scope of the invention. Other examples of changes, substitutions, and alterations are readily ascertainable by one skilled in the art and could be made without departing from the spirit and scope of the present invention.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7640680 *Sep 20, 2005Jan 5, 2010Castro Ernesto GPedorthic systems
US20100281709 *Jul 12, 2010Nov 11, 2010Young Sun HwangElastic Shoes For Cushioning Against Impact
US20130125421 *Nov 23, 2011May 23, 2013Nike, Inc.Article of Footwear with an Internal and External Midsole Structure
EP2288269A1 *May 6, 2009Mar 2, 2011Trackguard Inc.Shoe system with a resilient shoe insert
WO2011020798A1 *Aug 15, 2010Feb 24, 2011Stefan LedererTread cushion for shoe soles
WO2013030341A1 *Aug 31, 2012Mar 7, 2013Christian ColinShoe sole device and shoe comprising such a sole device
Classifications
U.S. Classification36/27, 36/28
International ClassificationA43B13/18, A43B21/30, A43B21/28, A43B13/20
Cooperative ClassificationA43B21/30, A43B21/285, A43B13/206, A43B13/203, A43B13/183, A43B3/0063, A43B13/187, A43B1/0018
European ClassificationA43B1/00B, A43B3/00S50, A43B13/20T, A43B13/20P, A43B13/18A2, A43B21/30, A43B21/28P, A43B13/18F