Mid-sole or sole of shoes

Abstract: There is described a half, mid or full sole for a shoe comprising: a base plate (1) of a shape corresponding to a sole of a shoe having an upper surface provided with a border area (12) and with a recess (11), which recess corresponds substantially in shape to the sole of a shoe, a plurality of protruding members (10) arranged in the recess (11) of the base plate (1) so as to lie substantially parallel to each other and substantially perpendicular to an axis running from the heel to the toe of the shoe the protruding members (11) extending in a slanted direction outwardly from the recess (11); a cover (2) provided with a recessed area (21) corresponding substantially in shape to the sole of a shoe and with a border area (22) which is bonded to the border area (12) of the base plate (1); and a fluid sealed in the space between the bottom plate (1) and the cover (2) formed by the recess (11) and the recessed area (21), wherein the cover (2) is also provided with an intermediate area (23) formed around at least a part of the recessed area (22) so as to be positioned between the recessed area (21) and the border area (22), which intermediate area (23) is of a predetermined width and increases in thickness in a direction extending from the recessed area (21) to the border area (22).

Description: This invention relates to a half, mid or full sole for a shoe which seeks an effect of shock absorption during walking and also a massage effect owing to excitement of the sole of the foot while providing for a comfortable sense of wear. Of course the invention is applicable to and covers sandals and the like. In the prior art, it is well known that absorption of the shocks and massaging of the sole of the foot during walking are effective for maintaining health. Soles for shoes, which soles have a massaging effect due to the fact that they contain a fluid sealed therein, are disclosed in EP-A-0336801 which forms the preamble of independent claim 1, and FR-A-2591441. Furthermore, in EP-A-0487221 (published after the first priority date claimed in the present application), there is dislcosed a half, mid or full sole for a shoe comprising: a base plate of a shape corresponding to a sole of a shoe having an upper surface provided with a border area and with a recess, which recess corresponds substantially in shape to the sole of a shoe, a plurality of protruding members arranged in the recess of the base plate so as to lie substantially parallel to each other and substantially perpendicular to an axis running from the heel to the toe of the shoe, the protruding members extending in a slanted direction outwardly from the recess; a cover provided with a recessed area corresponding substantially in shape to the sole of a shoe and with a border area which is bonded to the border area of the base plate; a fluid sealed in the space between the base plate and the cover formed by the recess and the recessed area; and an intermediate area formed around at least a part of the recessed area so as to be positioned between the recessed area and the border area, which intermediate area is of a predetermined width. When a person wearing shoes with the soles of EP-A-0487221 walks, the sealed water is moved in the recess to absorb shocks during the walking while providing a stable and comfortable sense of wearing. In addition, with adequate rigidity of the blades and action of water to alleviate the rigidity, the sole of the foot can be excited continuously with an adequate strength without producing any pain even when the shoes are worn for a long time. However, the shoes using the sole of EP-A-0487221 are subject to leakage of the sealed water. From examination thereof, it has been found that water leaks in a specific portion, i.e. the fore end portion contacted by, for instance, the little to middle toes of the foot. The cause for this was investigated to find the following. Since the cover is formed with a recess having a shape corresponding to the sole of a foot, the base plate corresponding to the recess is naturally reduced in thickness, and the portion corresponding to the little to middele toes, particularly the third toe, is always strongly pushed down and deformed when the shoe is about to be separated from the ground. This force, together with the urging force of the water, causes the fused portion in the neighbourhood of the portion contacted by the little to middle toes to be weakened to result in the leakage of water. An object of the present invention is to provide a half, mid or full sole for a shoe, in the case of which the leakage of sealed water can be prevented and in the case of which the feel of wearing of the shoes is improved. According to the present invention, there is provided a half, mid or full sole for a shoe comprising: a base plate of a shape corresponding to a sole of a shoe having an upper surface provided with a border area and with a recessed area, which recessed area corresponds substantially in shape to the sole of a shoe; a plurality of blades arranged in the recessed area of the base plate so as to lie substantially parallel to each other and substantially perpendicular to an axis running from the heel to the toe of the shoe, the blades extending in a slanted direction outwardly from the recessed area of the base plate; a cover provided with a recessed area corresponding substantially in shape to the sole of a shoe and with a border area which is bonded to the border area of the base plate; a fluid sealed in the space between the base plate and the cover formed by the recessed area of the base plate and the recessed area of the cover; and an intermediate area formed around at least a part of the recessed area of the cover so as to be positioned between the recessed area of the cover and the border area of the cover, which intermediate area is of a predetermined width and increases in thickness in a direction extending from the recessed area of the cover to the border area of the cover; wherein the border area of the base plate has the same shape as the border area of the cover; and the blades are higher than the border area of the base plate; characterised in that: the recessed area of the base plate is formed in only the upper surface of the base plate; each blade has uniformly spaced-apart grooves and the opposite ends of each blade are coupled to the border area of the base plate via webs, the webs being lower than the blades and the border area of the base plate; and the base plate is also provided with an intermediate area formed around at least a part of the recessed area of the base plate so as to be positioned between the recessed area of the base plate and the border area of the base plate, which intermediate area is of a predetermined width and increases in thickness in a direction extending from the recessed area of the base plate to the border area of the base plate. Reference will now be made, by way of example, to the drawings in which: Fig. 1 is a front view showing a base plate of a sole of the invention; Fig. 2 is a front view showing a cover of a sole of the invention; Fig. 3 is a developed view taken along line a-a in Fig. 1; Fig. 4 is a front view showing another cover of a sole of the invention; Fig 5. is a developed view showing a base plate and cover of a sole of the invention; and Fig. 6 is a fragmentary enlarged-scale sectional view showing a base plate and cover in a fused state thereof. Now, embodiments of the invention will be described with reference to the drawings. The construction according to the invention roughly comprises a base plate 1, as shown in Fig. 1, with a plurality of integral blades 10, a cover 2, as shown in Fig. 2, overlapped over the base plate 1 and welded to the outer periphery thereof, and water sealed between the base plate 1 and cover 2. The base plate 1 is formed as one-piece molding of an elastic thermoplastic resin, i.e., polyvinyl chloride. It has an outer shape of the sole of shoes as shown in Fig. 1. The upper surface of the base plate is a recessed area having a shape corresponding to the sole of a foot as shown in Fig. 1. The recessed area 11 is surrounded by a border area 12 for welding. The border area 12 has an upper portion which is wider than the rest of it. The wider portion may be cut to suit the size of shoes, and thus it serves as a portion for providing variation to the sole. The blades 10 are formed in the recessed area 11 of the base plate 1 such that it is integral therewith. They extend in a direction perpendicular to the longitudinal direction of the sole of shoes (i.e., in the transverse direction in Fig. 1). As shown in Fig. 3, they are slanted downward, i.e., toward the heel. They have a height greater than the height of the border area 12. In the completed state of the mid-sole or sole of shoes according to the invention, the blades are urged and curved by a recessed area 21 of the cover 2, thus enhancing the state of close contact between the base plate and cover, while the sealed water can move through webs 13 and grooves 10a. For adjusting the rigidity of the blades, the opposite ends of each blade 10 are coupled to the border area 12 via webs 13, as shown in Fig. 1. The webs have a smaller height than the blades so that water can be moved gently. Each blade 10 has three uniformly spaced-apart grooves 10a. These grooves have such dimensions as to permit gentle movement of the sealed water. The cover 2 is molded from polyvinyl chloride, the same material as for the base plate 1. It has a recessed area 21 having a shape corresponding to the sole of shoes. It also has a border area 22 surrounding the recessed area 21 and having a predetermined width. The border area 22 has an increased thickness and has the same shape as and is to be bonded by fusing to the border area 12 of the base plate 1. Like the base plate 1, the border area 22 has a wider upper portion to be cut to the size of shoes. The cover 2 has an increasing thickness intermediate area 23 surrounding the recessed area 21. The intermediate area 23 is formed slantedly with increasing thickness toward the increased thickness border area 22. The intermediate area 23 has to be formed in a portion, to which concentrated urging force is applied, for instance, at least a portion contacted by the toes of a foot. Particularly, a portion contacted by the middle to little toes is important. This portion varies depending on the habit of the person wearing the shoes, and thus the intermediate area 23 is desirably formed over the entire portion contacted by the toes as noted above. Further, since it is possible that the corners of the boundary between the border area 22 and the recessed area 21 of the cover 2 strikes the sole of a foot to produce a condition commonly termed corns, the intermediate area 23 is desirably formed around the entire edge of the recessed area 21. The base plate 1 also has an increasing thickness intermediate area 14 around the recessed area 11. This intermediate area 14 is formed such that it is slanted with increasing thickness toward the increased thickness border area 12. This is made so because the lower side walls of a shoe are upwardly flaring, and the side surfaces of the cut such as to provide an upward flaring when finally assembling the sole inside the shoe. It is thus necessary to make the inner side surface of the border area 12 around the recessed area 11 of the base plate 1 also upwardly flaring by providing the intermediate area 14 slanted with increasing thickness toward the increased thickness border area 12. The border area 22 of the cover 2 is bonded to the border area 12 of the bottom plate 1, the bonding surfaces being fused together by high frequency welding. Then, water is injected into the space defined between the recessed areas 11 and 21 and also between the intermediate area 14 and 23 through a port (not shown) formed in the border area 12 of the base plate 1 and the border area 22 of the cover 2, and then the port is sealed. Since the intermediate area 23 is formed with a predetermined width around the recessed area 21 of the cover 2, the cover is less deformed when it is partly concentratedly urged by the toes. Thus, there is no possibility for the sealed water to reduce the sealing force of the bonded surfaces of the border areas 12 and 22. When the shoes using the sole having the above construction are worn, water gently reciprocates along the spaces between adjacent blades in the transverse direction, i.e., in the longitudinal direction of the blades and also gently reciprocates back and forth via the grooves 10a and webs 13, thus absorbing the shocks produced when walking while providing a stable and comfortable sense of wearing. Further, as the blades 10 are urged, the sole of foot is excited by adequate rigidity provided by the slanted form of the blades. Further, the gentle movement of water noted above has an effect of alleviating the excitement caused by the rigidity of the blades. It is thus possible to massage the sole of a foot continuously without producing any pain even when the shoes are worn for long time. A different embodiment of the invention will be described with reference to Figs. 4 to 6. This embodiment has a feature in the structure of the cover. As shown in Fig. 4, in the recessed area 31 of the cover 3 a plurality of (i.e., four in the Figure) blades 30 are formed on at least a portion, which is urged by the toes and swelling toe roots. These blades extend in a direction perpendicular to the longitudinal direction of the cover, and they are slanted as shown in Fig. 5. As shown in Fig. 6, the border area 32 of the cover 3 is bonded to the border area 12 of the base plate 1, with the bonding surfaces fused together by high frequency welding. Water is injected into the space defined by the recessed areas 11 and 31 and also between the increasing thickness intermediate areas 14 and 33 through an injection port (not shown) provided in the border area 12 of the base plate 1 and the border area 32 of the cover 3, and then the port is sealed. With the blades 30 formed in the recessed area 31 of the cover 3 and the intermediate area 33 with a predetermined width formed around the recess, the cover is less deformed when it is partly urged concentratedly by the toes. Thus, there is no possibility for the sealed water to reduce the sealing force of the fused surfaces of the border areas 12 and 32. Further, when a portion of the cover corresponding to the toes and swelling toe roots is to be urged concentratedly by the blades 30, the movement of water is alleviated by the blades to further alleviate the impact force applied to the fused surfaces of the border areas 12 and 32. The force of sealing the sealed water thus is not reduced. In this way, the blades 30 have an effect of alleviating the impact of water moved as the user wearing the shoes walks step by step.

Claims: A half, mid or full sole for a shoe comprising: a base plate (1) of a shape corresponding to a sole of a shoe having an upper surface provided with a border area (12) and with a recessed area (11), which recessed area (11) corresponds substantially in shape to the sole of a shoe; a plurality of blades (10) arranged in the recessed area (11) of the base plate (1) so as to lie substantially parallel to each other and substantially perpendicular to an axis running from the heel to the toe of the shoe, the blades (10) extending in a slanted direction outwardly from the recessed area (11) of the base plate (1); a cover (2) provided with a recessed area (21) corresponding substantially in shape to the sole of a shoe and with a border area (22) which is bonded to the border area (12) of the base plate (1); a fluid sealed in the space between the base plate (1) and the cover (2) formed by the recessed area (11) of the base plate (1) and the recessed area (21) of the cover (2); and an intermediate area (23) formed around at least a part of the recessed area (21) of the cover (2) so as to be positioned between the recessed area (21) of the cover (2) and the border area (22) of the cover (2), which intermediate area (23) is of a predetermined width and increases in thickness in a direction extending from the recessed area (21) of the cover (2) to the border area (22) of the cover (2); wherein the border area (12) of the base plate (1) has the same shape as the border area (22) of the cover (2); and the blades (10) are higher than the border area (12) of the base plate (1); characterised in that: the recessed area (11) of the base plate (1) is formed in only the upper surface of the base plate (1); each blade (10) has uniformly spaced-apart grooves (10a) and the opposite ends of each blade (10) are coupled to the border area (12) of the base plate (1) via webs (13), the webs (13) being lower than the blades (10) and the border area (12) of the base plate (1); and the base plate (1) is also provided with an intermediate area (14) formed around at least a part of the recessed area (11) of the base plate (1) so as to be positioned between the recessed area (11) of the base plate (1) and the border area (12) of the base plate (1), which intermediate area (14) is of a predetermined width and increases in thickness in a direction extending from the recessed area (11) of the base plate (1) to the border area (12) of the base plate (1). A half, mid or full sole of a shoe according to claim 1, wherein the intermediate area (23) of the cover (2) is positioned so that it covers at least the area which in use is contacted by the toes of a wearer of the shoe. A half, mid or full sole of a shoe according to claim 1 or 2, wherein the intermediate area (23) of the cover (2) is formed all around the recessed area (21) of the cover (2). A half, mid or full sole of a shoe according to claim 1, 2 or 3, wherein the recessed area (21) of the cover (2) is provided with a plurality of blades (30) arranged so as to lie substantially parallel to each other and substantially perpendicular to an axis running from the heel to the toe of the shoe and extending in a slanted direction outwardly from the recessed area (21) of the cover (2). A half, mid or full sole of a shoe according to claim 1, 2, 3 or 4, wherein the base plate (1) and the cover (2) are made of a thermoplastic resin. A half, mid or full sole of a shoe according to claim 1, 2, 3, 4 or 5, wherein the plurality of blades (10) of the base plate (1) are integral with the base plate (1).

Inventors: SHIBATA OSAMU, SHIBATA, OSAMU
Applicants: HIMIKO KK, KABUSHIKI KAISHA HIMIKO
Application year: 1993
Main classification: A43B13
IPC codes: A43B13, A43B17