JP2008050744A - Sock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sock capable of correcting so as to normally keep the shape of not only the transverse arch of foot but also the longitudinal arch of foot. <P>SOLUTION: The sock is so designed that a first tightening part 2 rich in stretchability in a circumferential direction is provided around a position near a tiptoe direction in the vicinities of a heel part 1, and a second tightening part 4 rich in stretchability in a circumferential direction is provided around a position near a heel direction in the vicinities of a tiptoe part 3, wherein a connection part which has low stretchability in a longitudinal direction of the sock, compared to an instep part 6, is provided at the bottom of the sock so as to connect the first tightening part 2 and the second tightening part 4 to each other. The connection part 5 acts to raise up the arch of a foot along an arch shape of the longitudinal arch of foot, so it is possible to obtain not only effect of correcting the transverse arch of foot by the first tightening part and the second tightening part but also effect of correcting to normally keep the arch shape of the longitudinal arch of foot. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sock that corrects the arch shape of the vertical arch so as to keep it normal and promotes normal walking by pushing up the arch along the curve of the vertical arch of the foot.

  FIG. 4 is a diagram illustrating a state in which a bone of a human right foot is viewed from the sole side. As shown in FIG. 4, the bones constituting a human foot are roughly divided into phalanges G1, metatarsals G2, and tarsal bones G3. As shown in FIG. A vertical foot arch H1 (vertical arch) and a horizontal foot arch H2 (lateral arch) are formed.

  The vertical arch H1 and the horizontal arch H2 are not independent of each other, form an arch in relation to each other, and function as a spring to relieve shock when walking on the ground and distribute the weight over the entire foot. And play an important role in smoothing weight transfer. As shown in FIG. 4 and FIG. 5 (a), the longitudinal foot arch H1 forms an arch from the radial tuberosity G31 to the first metatarsal G21 beyond the talus, scaphoid and medial wedge bone. And an outer arch that forms an arch through the leg bone starting from the radius nodules G31 and to the fifth metatarsal bone G22. On the other hand, as shown in FIG. 5 (a), the lateral foot arch H2 includes a front arch formed from the first metatarsal G21 to the fifth metatarsal G22, and three wedge-shaped bones. It consists of a main arch formed from G32 to the right side G33.

  FIG. 6 illustrates the main ligaments of the sole, where J3 indicates the bottom cuboid ligament and J4 indicates the bottom ligament. The ligaments at the sole of the foot are strongly stretched and maintain the arch with respect to the longitudinal arch H1 and the transverse arch H2 formed by the skeleton, and in particular, the bottom ligament ligament J1 and the long sole ligament J2 However, it is said to be an important ligament that maintains the sole arch structure. In this way, the arch structure of the sole consisting of the vertical foot arch H1 and the lateral foot arch H2 acts as a spring to alleviate the impact at the time of ground contact and distribute the weight over the entire foot to move the weight. Therefore, maintaining the normal shape of the vertical arch H1 and the horizontal arch H2 is considered to lead to a normal walking motion.

  However, in the case of the vertical foot arch H1, the bottom side toe ligament J1 and the long sole ligament J2 that maintained the vertical foot arch H1 are excessively stretched when the toe standing by high heels or walking with hard leather shoes continues for a long time. As a result of the continued state, the arch of the vertical arch H1 is lowered, making it difficult to maintain a normal curve. If the shape of the vertical arch of the vertical arch H1 cannot be maintained, the impact absorption effect during walking cannot be obtained sufficiently, and normal walking movement cannot be performed, causing fatigue of the foot or pain in a specific part. Cause. In addition, the above-mentioned problem is particularly noticeable in a person with a flat foot who has not yet formed the vertical foot bow H1.

Thus, socks have been disclosed that aim to correct the metatarsal ligament in the lateral arch-like reproduction direction by tightening from both sides when worn.
JP 2005-42213 A

  For example, in Patent Document 1 described above, the sole portion corresponding to the metatarsal ligament and the portions that abut both sides thereof are made of a highly elastic high elastic material, and the foot surface portion corresponding to the metatarsal ligament is applied. A sock having a function of correcting a metatarsal ligament in a lateral arch-like regenerative direction by constructing a contacting portion with a low elastic material having lower elasticity than the elastic material and tightening from both sides when worn is proposed. Yes.

Conventionally, socks have also been known for the purpose of restoring the normal function of the foot by restoring the arch of the foot while suppressing poor circulation.
JP 2005-312512 A

  Specifically, for example, in the above-mentioned Patent Document 2, the part corresponding to the sole side of the lateral midfoot ligament and the part corresponding to the dorsal side of the tarsal bone of the sock body are viewed in the width direction of the foot. Elastic stretchable parts with stronger tensile resistance than other parts are arranged, and both ends of the elastic stretchable parts on the sole side are extended so as to cover the substantially lower half of the inside and outside side parts of the foot, and the foot A sock having a configuration in which both end portions of the elastic elastic portion on the back side are extended so as to cover substantially the upper half of the inner and outer side portions of the foot has been proposed.

  However, since the sock of the above-mentioned patent document 1 is intended to correct the metatarsal ligament in the lateral arch-like reproduction direction by tightening from both sides when worn, it is constant for the lateral foot arch H2. Although there is a possibility that a straightening effect can be obtained, the longitudinal arch H1 has a problem that a straightening effect cannot be expected.

  Also, the sock of the above-mentioned Patent Document 2 also has a tensile resistance force in the width direction of the foot in the portion corresponding to the sole side of the lateral metatarsal ligament and the portion corresponding to the dorsal side of the tarsal bone. Since it is the structure which has arrange | positioned the stronger elastic expansion-contraction part, respectively, it is conscious of only the lateral foot arch H2, and sufficient correction effect is not acquired with respect to the longitudinal foot arch H1.

  In short, as shown in FIG. 7, the conventional sock has a sole portion between the heel portion 100 and the toe portion 300 in a state in which the mouth rubber portion 1000 is expanded and the leg F1 is inserted from the opening portion 800 and the sock is worn. Since the space F3 exists between the arch 500 and the arch F2, the state where the bottom side ligament ligament J1 and the long sole ligament J2 maintaining the longitudinal foot arch H1 continued to extend for a long time. A sufficient effect cannot be exhibited for the phenomenon that the arch of the foot arch H1 is lowered.

  The present invention has been made in view of the above-described conventional problems, and by pushing up the arch along the curve of the vertical footbow H1, not only the lateral footbow H2 but also the vertical footbow H1 is provided. An object of the present invention is to provide a sock that can be corrected to keep the shape of the arch normal.

In order to achieve the above object, the sock of the present invention comprises:
A first tightening portion having a high circumferential elasticity is provided at a position near the toe direction near the heel portion of the sock, and a first elastic portion having a high elasticity in the circumferential direction at a position near the heel direction near the toe portion of the sock. A sock having two tightening portions, wherein the length of the sock is longer than the instep portion of the sock so as to connect the first tightening portion and the second tightening portion to the sole portion of the sock. The most important feature point is that a connecting portion having low direction elasticity is provided.

  According to the present invention, the first tightening portion is provided at a position near the toe direction near the heel portion of the sock, and the second tightening portion is provided at a position near the heel direction near the toe portion of the sock. Therefore, by these tightening portions, a lateral arch composed of a front arch formed from the first metatarsal G21 to the fifth metatarsal G22 and a main arch formed from the left G32 to the right G33 of the arch The effect of correcting the lateral arch with respect to H2 is obtained.

  Furthermore, the sock of the present invention is provided with a connecting portion having a lower stretchability in the longitudinal direction of the sock compared to the instep portion of the sock so as to connect the first tightening portion and the second tightening portion to the sole portion. This connecting portion acts to push up the arch along the arch of the vertical foot arch H1, and an effect of correcting the arch shape of the vertical foot arch H1 to be normal can also be obtained.

  The sock of the present invention is provided with a first tightening portion that is rich in stretch in the circumferential direction at a position near the toe direction near the heel portion of the sock, and in a circumferential direction at a position near the heel direction near the toe portion of the sock. Compared with the instep part of the sock so as to connect the first tightening part and the second tightening part to the sole part of the sock, the sock having the second tightening part rich in elasticity And it is the structure which provided the connection part with the low elasticity of the longitudinal direction of the sock.

  In the present invention, the longitudinal stretchability of the connecting portion that connects the first tightening portion and the second tightening portion is smaller than the stretchability in the longitudinal direction of the instep portion. By doing so, the generation of the space F3 in FIG. 7 is prevented, and the effect of firmly pushing up the arch along the curve of the vertical footbow H1 is exhibited. Here, the stretchability in the longitudinal direction refers to the stretchability in the longitudinal direction of the sock (stretchability in a direction parallel to a straight line connecting the heel portion and the toe portion).

  The degree to which the stretchability of the connecting portion is reduced is not particularly limited, but according to the study by the present inventor, the density of the stitches in the longitudinal direction is 2 as compared with the instep portion of the sock. It has been proved that the difference in stretchability is moderate when it is doubled or more, and the arch push-up effect is suitable. The fact that the density of the stitches in the longitudinal direction is twice or more means, for example, that the number of courses per inch in the longitudinal direction is twice or more.

  Further, in the present invention, the size of the connecting portion is not particularly limited, but according to the study by the present inventors, the length in the longitudinal direction of the sock at the center position in the circumferential direction of the connecting portion is 3 cm or more and 3.5 cm or less. It has been found that a range is more desirable. Because there is a difference in the size of the foot, it cannot be generally stated, but if it is within the above range, it is possible to follow the arch shape of the vertical footbow H1 exactly. Note that “the central position in the circumferential direction of the connecting portion” means that the connecting portion has a required width in the circumferential direction of the sock, but the central position in the circumferential width. Further, the “length in the longitudinal direction of the sock” means a direction parallel to a line connecting the toe part of the sock and the heel part (a direction orthogonal to the circumferential direction of the sock).

  Further, in the present invention, the shape of the connecting portion is not particularly limited, but according to a study by the present inventor, when viewed from the sole side, the vicinity of the central portion in the longitudinal direction of the sock is constricted. Is more desirable. In this way, the stretchability gradually increases from the sole side to the instep side, so there is no tension or wrinkle when wearing socks and it is comfortable to wear, and it feels strange. It is not given.

  In the present invention, it is more desirable that the inner surface of the first tightening portion and the heel portion be pile knitting. This is because the foot does not slip inside the sock, so that the position of the connecting portion is stabilized, and the pile knitting functions as a cushion to relieve the impact on the foot when walking on the ground. .

  In the present invention, it is more preferable that the thickness of the fabric near the center of the sole portion of the second tightening portion and the inside of the arch portion of the sock is thicker than the thickness of the fabric of other portions. This is because the vicinity of the center portion of the bottom portion of the second tightening portion and the arch portion are firmly supported, and the stability is improved.

  In the present invention, it is more desirable to further provide a third tightening portion having a high elasticity at a position near the heel direction near the heel portion of the sock. This is because the ankle can be firmly supported and the sock can be prevented from falling off.

  Hereinafter, the sock of the present invention will be described in more detail based on examples. FIG. 1 is an explanatory view showing a state in which the sock of the present invention for the left foot is viewed from the lateral direction.

  The sock of the present embodiment is a sock knitted using a sock knitting machine, and means such as knitting with tuck knitting in which stretchable yarns are inserted in the vicinity of the heel portion 1 near the toe direction. Thus, the first tightening portion 2 rich in stretchability in the circumferential direction of the sock is provided around. Similarly, a second tightening portion 4 that is rich in stretchability in the circumferential direction is also provided at a position near the toe portion near the toe portion 3 of the sock.

  In the sock of the embodiment, since the tightening force works in the direction shown by the arrow A in FIG. 1 by arranging the first tightening portion 2 as described above, the lateral footbow formed from the left side to the right side of the arch A correction effect on the main arch is obtained. Further, by providing the second tightening portion 4 as described above, a tightening force is exerted in the direction indicated by the arrow B in FIG. 1, so that the lateral width formed from the first metatarsal to the fifth metatarsal is formed. A correction effect on the front arch of the arch is also obtained.

  In addition, the sock of the present embodiment is longer in the lengthwise direction of the sock than the instep part 6 of the sock so as to connect the first tightening part 2 and the second tightening part 4 to the sole part of the sock. The connection part 5 with low property (stretchability in the direction parallel to the arrow C in FIG. 1) is provided. In this way, in the present invention, the connecting portion 5 having low elasticity is provided at the sole, and both ends in the longitudinal direction of the connecting portion 5 are connected to the first tightening portion 2 and the second tightening portion 4, An effect of pushing the arch firmly in the direction of the arrow D in FIG. 1 along the curve of the vertical foot bow H1 is obtained.

  In this embodiment, the density of the stitches in the longitudinal direction of the connecting portion 5 is doubled compared to the density of the stitches in the longitudinal direction of the instep portion 6 of the sock, and the difference in stretchability is moderate, The push-up effect is made suitable. Further, the connecting portion 5 of the present embodiment has a length in the longitudinal direction of the sock at the center position in the circumferential direction of the connecting portion 5 (the length of the portion indicated by L in FIG. 1) is 3.3 cm. It is designed to follow the shape of the arch exactly.

  In FIG. 1, 10 indicates a mesh portion provided at a position near the toe of the instep portion 6 in order to improve air permeability inside the sock, 8 indicates a foot insertion opening, and 11 indicates a rubber band portion. ing. Reference numeral 7 denotes a third tightening portion provided at a position near the heel direction near the heel portion 1 of the sock. The third tightening portion 7 is knitted so as to be rich in the stretchability in the circumferential direction by means such as knitting with tuck knitting in which stretchable yarn is inserted, and the tightening force acts in the direction indicated by the arrow E in FIG. Can be supported firmly and socks can be prevented from falling off.

  FIG. 2 is a diagram showing a state of the sock of the present embodiment as viewed from the sole side. The toe portion 3 is above the paper surface, and the heel portion 1 is below the paper surface. The connection part 5 of the sock of the present embodiment has a shape in which the vicinity of the center part 53 in the longitudinal direction of the sock is constricted when viewed from the sole side. As shown in FIG. 2, the constricted shape means a circumferential width at the upper and lower longitudinal positions indicated by 51 and 55, a circumferential width at an intermediate position indicated by 52 and 54, and a central portion. When the widths in the circumferential direction at the position 53 are compared, it means that the width is gradually narrowed toward the center portion 53. In this way, the stretchability gradually increases from the sole side to the instep side, so there is no tension or wrinkle when wearing socks and it is comfortable to wear, and it feels strange. Since it does not give, it is suitable.

  Although not shown, in the sock of the embodiment, the inner surface of the first tightening portion 2 and the heel portion 1 is pile knitted to prevent the foot from slipping inside the sock. Thereby, since the foot does not slip inside the sock, the position of the connecting portion 5 is stabilized, and the pile knitting becomes a cushion, and the effect of mitigating the impact on the foot at the time of walking on the ground can be obtained.

  In addition, as shown in FIG. 2, the sock of the embodiment is provided with a thickness increasing portion 9 in which the thickness of the fabric is increased near the center of the sole of the second tightening portion 4 and near the inside of the arch of the sock. Thus, the vicinity of the center of the bottom of the second tightening portion and the arch are firmly supported to improve stability.

  FIG. 3 is a diagram illustrating a state in which the sock of the present invention is worn. In the present invention, the first tightening portion is provided at a position near the toe direction near the heel portion, and the second tightening portion is provided at a position near the heel direction near the toe portion. In addition to obtaining a correction effect on the foot arch H2, a connecting portion having a lower stretchability in the longitudinal direction of the sock is connected to the sole so as to connect the first tightening portion and the second tightening portion to the sole. As is clear from the comparison with FIG. 7 in which a conventional sock is worn, there is no space between the connecting portion 5 and the arch F2, and the arch is firmly pushed up along the curve of the vertical footbow, The effect of correcting the arch shape of the footbow so as to keep it normal is also obtained. That is, according to the configuration of the present invention, it is possible to correct not only the transverse arch but also the arch shape of the longitudinal arch so that the shape of the arch is normal. The effect of prompting is also obtained.

  Further, the method and results of a test conducted to confirm the effect of the sock of the present invention will be described. In the following test, an example of the embodiment of the sock of the present invention shown in FIG. 1 is provided as “Example 1”, which includes only a configuration corresponding to the first tightening portion and the second tightening portion, and there is no configuration corresponding to the connecting portion. An example of a conventional sock that does not have a configuration corresponding to the first tightening part, the second tightening part, and the connecting part as shown in FIG. Comparative example 2 ”. The effect confirmation test was carried out on three items: a tensile test, a foot landing pressure test, and an arch area change rate comparison test. The test methods and results of each test are as follows.

1) Tensile test For each sock of Example 1, Comparative Example 1 and Comparative Example 2,
(A) Longitudinal tensile force at the sole of the sock (B) Circumferential tensile force at a position near the toe near the heel of the sock (C) Circumferential at a position near the heel near the toe of the sock The tensile force of each was measured. At each location of (A), (B), (C), the tensile force was measured by the following method.

(Test conditions for tensile test)
Measuring instrument: “INSTRON” (registered trademark) manufactured by Instron
Test conditions: 23 ° C., 50%, tensile speed 300 mm / min
Test method:
(A) Cut into a 2.5 × 9 cm test piece (a part of the sole, excluding the toe and heel).
(B) Repeat 3 cm (about 20%) extension and recovery three times. Read the value of tensile force at the third extension.
(C) Measure five times by the above method and take an average value.

  The test results were as shown in Tables 1 to 3 below. The tensile force measures the force required for tension. The larger this value, the longer the arch shape is maintained for (A), and the horizontal arch shape is maintained for (B) and (C). It can be said that support is strong in the direction. Note that the portions (B) and (C) of Comparative Example 1 have the same structure as the portions (B) and (C) of Example 1 and need not be compared, so the measurement is omitted.

  As shown in Tables 1 to 3, (A) About the tensile force in the vertical direction of the sole of the sock, Example 1 was 20.2 (N), Comparative Example 1 was 3.71 (N), and Comparative Example 2 has a result of 1.93 (N), and it was confirmed that Example 1 provided the connecting portion, so that the tension in the longitudinal direction was the largest. Therefore, it can be said that the effect of correcting the vertical arch shape of the present invention is clearly greater than that of the conventional product.

  In addition, Example 1 is the sock of FIG. 1, and as mentioned above, the density of the stitches in the longitudinal direction of the connecting portion 5 is twice the density of the stitches in the longitudinal direction of the instep portion 6 of the socks. It is what. On the other hand, Comparative Example 2 is a normal sock as shown in FIG. 7, and there is no difference in the density of stitches in the longitudinal direction between the sole portion 500 and the instep portion 600. When Example 1 and Comparative Example 2 are compared, the density of the stitches in the longitudinal direction of the instep part 6 of Example 1 and the instep part 600 of Comparative Example 2 is substantially the same, but the connecting part 5 of Example 1 is the same. The density of the stitches in the longitudinal direction is about twice that of the stitches in the longitudinal direction of the sole portion 500 of Comparative Example 2. By doing so, the tensile force of Example 1 was 20.2 (N), and the tensile force of Comparative Example 2 was about 1.93 (N), showing a difference of about 10 times. It was confirmed that the stretchability in the longitudinal direction can be set as low as about 1/10 if it is about doubled.

  In addition, (B) the circumferential tensile force at the position near the toe direction near the heel portion of the sock also resulted in Example 1 = 4.6 (N) and Comparative Example 2 0.47 (N). It has become. Therefore, it was confirmed that the present invention clearly has a large effect in correcting the lateral arch shape as compared with a normal sock as shown in FIG. Also, (C) the tensile force in the circumferential direction at the position near the heel direction near the toe portion of the sock also resulted in 3.45 (N) in Example 1 and 0.51 (N) in Comparative Example 2. The same is true.

2) Foot sole pressure test With the socks of Example 1, Comparative Example 1 and Comparative Example 2 worn, the pressure applied to the vicinity of the center of the vertical foot arch H1 in FIG. 5B was measured. The landing pressure was measured by the following method.

(Test conditions for plantar pressure test)
Measuring machine: Air pack type pressure measuring machine AMI3037-10
Test conditions: Male 20s right foot Test method:
(A) Affix the air pack near the center of the vertical arch H1.
(B) Put the test article on, sit on a chair, measure for 1 minute with the sole not touching the ground, and read the stable value (measured three times and take the average value).

  It can be said that the larger the value of the landing pressure, the stronger the force to push up the vertical arch, which means that the force is working in the direction of correcting the vertical arch shape. The test results were as shown in Table 4 below.

  As shown in Table 4, the value of the contact pressure (hPa) acting in the vicinity of the center of the longitudinal foot arch H1 is the highest in Example 1 which is an embodiment of the present invention, and according to the configuration of the present invention, the force pushing up the arch In other words, it was confirmed that the force for correcting the arch shape works effectively. In addition, compared with Comparative Example 1, since the wearing pressure of Example 1 is obviously large, in order to increase the wearing pressure of the portion where the transverse arch and the longitudinal arch intersect, It is not sufficient to provide two tightening portions. As in the socks of the present invention, a connecting portion having low stretchability in the longitudinal direction is connected to the sole portion of the socks so as to connect the first tightening portion and the second tightening portion. It was confirmed that the installation was extremely important.

3) arch area change rate comparison test Walking by calculating the rate of change by measuring the area of the arch part before and after walking when wearing the socks of Example 1 and Comparative Example 2 for a certain period of time. A test was conducted to compare the changes in the front and back plantar arches.

(Test conditions for the arch area change rate comparison test)
Subject: 3 males in standard 30s
(I) Take the foot of the foot on both feet.
(B) Wear sample socks and walk on a flat asphalt pavement for 3 hours by natural walking.
(C) After walking for 3 hours, take the footprints of the soles of both feet.
(D) The area of the foot corresponding to the arch was measured using an area measuring instrument (TAMAYA DIGITAL PLANIMETER “PLANIX” (registered trademark) manufactured by Tamaya Measurement System Co., Ltd.). In addition, as shown in FIG. 8, the range surrounded by the tangent 81 on the foot side on the thumb side and the foot of the foot 82 is defined as the arch portion 83, and the area is defined as the arch area. It was measured.
(E) The ratio of the amount of change from the arch area before walking at the time of (b) above to the arch area after walking at the time of (c) above is calculated, and the average value on the left and right is the “rate change rate of the arch area (%)” It was. That is, the arch area after walking (mm ² ) / the arch area before walking (mm ² ) = the arch area change rate (%).
(F) Obtain the difference (change rate difference) between the arch change rate when the above test was performed while wearing the socks of Example 1 and the arch change rate when the above test was performed while wearing the socks of Comparative Example 2. It was.

  In the above test, if the arch area change rate is less than 100%, it indicates that the ground contact area is larger after walking than before walking, and that the foot arch descends due to fatigue. it can. On the other hand, if the arch area change rate exceeds 100%, it indicates that the ground contact area is smaller after walking than before walking, and the effect of correcting the shape of the sole arch and preventing the descent continued. Can be thought of as showing.

  Table 5 shows average values of the arch area change rates of the three subjects in Example 1 and Comparative Example 2. Comparative Example 2 is slightly over 0.02% over 100%, but is in the error range, indicating little change in the shape of the sole arch. On the other hand, in Example 1, the area change rate of the arch was 104.85%, and since the change rate difference was 4.85%, the effect of correcting the shape of the sole arch was recognized, and the socks were taken off. It is thought that the effect continued after that.

  As described above, the sock of the present invention can correct not only the transverse arch but also the arch of the longitudinal foot arch, so that the shape of the plantar arch can be corrected normally or increased as compared with the conventional socks. It was confirmed that there is.

  In the above test, compared with normal walking, it seems that if you exercise more intensely with conventional socks, the burden on the sole will increase and there is a high possibility that the normal arch shape will not be maintained. It is done. On the other hand, if the sock of the present invention is used, the force to correct the vertical arch and the horizontal arch works, so that a normal arch shape is maintained even when intense exercise is performed, and the spring function of the sole arch is sufficiently exhibited. It is thought that.

  As described above, the sock of the present invention has the first tightening portion provided at a position near the toe portion near the heel portion, and the second tightening portion is provided at a position near the heel direction near the toe portion. These tightening portions provide a correction effect on the lateral foot arch and, in addition to connecting the first tightening portion and the second tightening portion to the sole portion, compared with the instep portion of the sock in the longitudinal direction of the sock. Since the connection part with low elasticity is provided, the arch is firmly pushed up along the curve of the vertical footbow, and the effect of correcting the arch shape of the vertical footbow to be normal can be obtained. Therefore, according to the configuration of the present invention, not only the lateral foot arch but also the shape of the arch of the vertical foot arch is normally maintained, so that an effect of promoting normal walking motion can be obtained.

  The socks of the present invention can be applied not only to general use but also to socks for athletes who continue to run for a long time such as marathon runners.

It is explanatory drawing showing the state which looked at the sock of this invention from the horizontal direction. It is explanatory drawing showing the state which looked at the sock of this invention from the sole side. It is a figure explaining the state which worn the sock of this invention. It is the figure showing the state which looked at the bone of a person's right leg from the sole side. (A) is formed from an inner arch and an outer arch that form an arch from the first metatarsal bone or the fifth metatarsal bone, and the first metatarsal bone to the fifth metatarsal bone, starting from the radius nodules. The front arch and the main arch formed from the left side to the right side of the arch, (b) is an explanatory view of the vertical and horizontal foot arches. It is explanatory drawing about the main ligaments of a sole. It is a figure explaining the state which wore the conventional socks. It is a figure explaining the definition of "arch part" in an arch area change rate comparison test.

Explanation of symbols

1 heel part 2 first tightening part 3 toe part 4 second tightening part 5 connecting part 6 instep part 7 third tightening part 9 thickness increasing part

Claims (7)

  A first tightening portion having a circumferential stretchability is provided at a position near the toe direction near the heel portion of the sock, and a first circumferentially stretchable position is provided at a position near the heel direction near the toe portion of the sock. A sock having two tightening portions, the length of the sock being longer than the instep of the sock so as to connect the first tightening portion and the second tightening portion to the sole of the sock A sock comprising a connecting portion having low elasticity in a direction.   2. The sock according to claim 1, wherein the connecting portion has a density of stitches in a longitudinal direction of the sock that is twice or more that of an instep portion of the sock.   The sock according to claim 1 or 2, wherein the connecting portion has a length in the longitudinal direction of the sock at a central position in the circumferential direction of the connecting portion in a range of 3 cm to 3.5 cm.   The sock according to any one of claims 1 to 3, wherein the connecting portion has a shape in which the vicinity of a central portion in the longitudinal direction of the sock is constricted when viewed from the sole side.   The sock according to any one of claims 1 to 4, wherein inner surfaces of the first tightening portion and the heel portion are pile knitted.   The thickness of the fabric near the center of the sole portion of the second tightening portion and the inside of the arch portion of the sock is made thicker than the thickness of the fabric of other portions. The sock according to any one of 5.   The sock according to any one of claims 1 to 6, further comprising a third tightening portion having a high elasticity in the circumferential direction at a position near the heel portion in the vicinity of the heel portion of the sock.

Images