Sock

Abstract

A sock (1) according to one embodiment of the present invention includes a highly stretchable portion (5), one end (5a) of which is connected to the peripheral portion of a wearing opening (3a), and is inclined toward the toe portion (31) and extends from the one end (5a) toward the sole (21) of the foot. When the metatarsophalangeal joint of the foot (F) is flexed, the highly stretchable portion (5) stretches the heel portion (32) toward the toe portion (31).

Description

Technical Field

[0001] The present invention relates to a sock worn on a foot, and more particularly to a sock capable of reducing displacement or shedding caused by movements such as walking. Background Art

[0002] In recent years, socks designed to reduce slippage during walking have become increasingly popular. These socks often feature anti-slip features or fabric attachments at the cuff or heel to increase frictional resistance or provide a stopper function. Alternatively, they feature areas with reduced stretchability to enhance grip.

[0003] To reduce the risk of socks falling off during walking, for example, as described in Patent Document 1, tape is sometimes used to lift the toe portion upward, connecting it to the sole of the foot. Furthermore, as described in Patent Document 2, a stretchable narrow fabric is sometimes provided along the periphery of the wearing opening. Furthermore, as described in Patent Document 3, a high-tightening fastening portion is sometimes provided around the heel (the portion extending from the sole of the foot to the Achilles tendon).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-31752

[0007] Patent Document 2: Japanese Patent Application Publication No. 2019-35159

[0008] Patent Document 3: Japanese Patent Publication No. 5197905 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] When walking, when the metatarsophalangeal joint, located on the toe side of the foot, flexes (a state where only the toe side touches the ground and the heel side floats), friction between the sock and the shoe causes the heel to shift. Repeated walking increases the heel shift and is believed to be a cause of sock shedding. Therefore, to effectively reduce sock shedding, it is important to increase the adhesion (wearing pressure) between the foot and the heel, especially when the metatarsophalangeal joint is flexed.

[0011] As mentioned above, it is believed that the sock often falls off due to the heel's displacement. However, the structure described in Reference 1 that lifts the toes upward does not fully reduce the heel's displacement. Furthermore, the toes' lifting effect is also exerted even when the metatarsophalangeal joint is not flexed (when the toes and heels are on the ground), so the foot is always tightened.

[0012] Furthermore, in the configuration described in Patent Document 2, where a narrow stretch fabric is provided along the periphery of the wearing opening, the wearing opening is particularly susceptible to a foreign body sensation or constriction, thus affecting the wearing feel. Furthermore, due to the adhesion between the sock and the shoe, traces of the thick portion of the narrow stretch fabric remain on the foot, causing itching or roughness.

[0013] Furthermore, in a configuration such as that described in Reference 3, where a fastening portion is provided around the heel, while heel displacement is reduced, the foot is still secured. Therefore, even when the metatarsophalangeal joint is not flexed, the heel remains in a fixed position. This can lead to stress caused by a sense of pressure on the foot, or to stress caused by the sticking condition during summer heat or skin roughness.

[0014] In view of the above problems, one aspect of the present invention aims to provide a sock that can suppress the feeling of tightness when the metatarsophalangeal joint is not flexed (extended) and can reduce displacement or falling off caused by movements such as walking.

[0015] Means of solving the problem

[0016] In order to solve the above-mentioned problem, a sock according to one embodiment of the present invention is characterized in that it includes: a sole portion covering the sole of the foot; a stretchable side portion including a toe portion and a heel portion and forming an opening portion serving as a wearing opening; and a highly stretchable portion having a lower stretchability than the side portion, one end of which is located at the peripheral portion of the opening portion, and is inclined in a direction close to the toe portion side and extends from the one end toward the sole side; and the highly stretchable portion is respectively arranged on both sides in the width direction of the side portion, so as to stretch the heel portion toward the toe portion side when the metatarsophalangeal joint of the foot is flexed.

[0017] Effects of the Invention

[0018] According to one aspect of the present invention, it is possible to provide a sock that can suppress a tight feeling when the metatarsophalangeal joint is not flexed and reduce displacement or falling off caused by movements such as walking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view showing a state where the socks according to the first embodiment of the present invention are worn on a foot.

[0020] Figure 2 This is an inner side view of a foot showing a state where the sock is worn on the foot.

[0021] Figure 3 It is an exploded view showing the fabric pattern constituting the socks.

[0022] Figure 4It is a side view showing the skeleton when the metatarsophalangeal joint of the foot is flexed.

[0023] Figure 5 It is a bottom view showing the skeleton of the foot when the foot is viewed from the back.

[0024] Figure 6 This is a side view of the inner side of the foot for explaining the position of the highly stretchable portion included in the sock.

[0025] Figure 7 This is a medial side view of the foot showing the state of the foot during walking.

[0026] Figure 8 This is a medial side view of the foot showing the state of the sock when the metatarsophalangeal joint is not flexed (extended).

[0027] Figure 9 This is a medial side view of the foot showing the state of the sock when the metatarsophalangeal joint is flexed.

[0028] Figure 10 This is a medial side view of a foot for explaining a modified example of the stretchable portion.

[0029] Figure 11 This is a perspective view showing a state where a sock according to a second embodiment of the present invention is worn on a foot. DETAILED DESCRIPTION

[0030] Implementation Method 1

[0031] Below, refer to Figures 1 to 10 In this embodiment, an example of applying the present invention to a sock having an asymmetrical shape according to the shape of the left and right feet in order to improve the wearing feeling will be described.

[0032] (Overall composition of socks)

[0033] Figure 1 1 is a perspective view showing a state where the sock 1 of this embodiment is worn on the foot (right foot) F. Figure 1 As shown, the sock 1 includes a sole portion 2 covering the sole of the foot F, a side portion 3 covering the side circumference of the foot F, and an anti-slip portion 4 and a highly stretchable portion 5 for reducing displacement or falling off of the sock 1.

[0034] The sock 1 is a stocking that covers the sole and a portion of the side surface of the foot F. The sock 1 may also be of a type that exposes a portion of the toe or heel. Alternatively, the sock 1 may be of a type with finger pockets, such as a five-finger type or a cloth sock type.

[0035] The side portion 3 includes a toe portion 31, a heel portion 32, and a side portion 33 extending from the toe portion 31 to the heel portion 32. A generally oval-shaped opening 3a for inserting and exiting the foot F is formed in the approximate center of the side portion 3. The opening 3a is formed with a large opening to expose the instep and ankle of the foot F. This allows the entire sock 1 to be concealed within the shoe when the shoe is worn.

[0036] In this embodiment, the sock 1 is knitted using a knitting machine, with the fabric forming the sole 2 and the fabric forming the side portions 3 sewn together (a fabric-type). Specifically, the outer periphery of the fabric forming the sole 2 and the side portions 3 are joined by sewing. However, a circular knitting machine for socks can also be used to continuously knit the sole 2 and the side portions 3 (a knit-type).

[0037] Regarding the fabric type, both the sole 2 and the side 3 preferably comprise stretchable fabric. For example, if the fabric comprising the sole 2 has low frictional resistance, slippage may occur between the sole 2 and the sole of the foot F, as well as between the sole 2 and the shoe sole during wear, causing the sock 1 to fall off and deteriorating the wearing feel. Therefore, yarns blended with natural fibers, such as cotton, that have moderately high frictional resistance and are gentle on the skin, are suitable as the raw material for the fabric comprising the sole 2. However, the raw material for the fabric comprising the sole 2 is not limited to this.

[0038] The material of the fabric forming the side portions 3 is also not limited, but it is particularly preferred to use a roughly cut fabric (free-cut fabric) that does not unravel when cut. Using free-cut fabric eliminates the need for unraveling prevention treatment around the edge of the wearing opening 3a. This, for example, can avoid the degradation of the wearing feel that would otherwise occur if unraveling prevention fabric were applied to the edge of the wearing opening 3a.

[0039] The side portion 3 may be formed into a circular or oval shape by cutting a single piece of fabric and forming an opening as the wearing opening 3a. Alternatively, the side portion 3 may be formed into a circular shape by joining together multiple fabrics of different materials, for example, on the toe portion 31 side and the heel portion 32 side.

[0040] The sole 2 and the side portion 3 may be joined together by sewing, but may also be joined together by adhesion using tape, thermal welding, or the like.

[0041] On the other hand, in the case of a knitted type, the sole 2 and the side 3 are continuously knitted using a circular knitting machine for socks. For example, the sole 2 and the side 3 are continuously knitted using a 144-needle, single-cylinder sock circular knitting machine using No. 32 single yarn (50% cotton, 50% acrylic fiber).

[0042] The anti-slip portion 4 is a band-shaped (surface-shaped) anti-slip component that has lower elasticity than the fabric forming the side portions 3 and higher frictional resistance (higher coefficient of friction with the skin). The anti-slip portion 4 is located on the inner surface of the heel portion 32, below the ankles (lateral and medial malleolus) and on the back side of the heel. The anti-slip portion 4 abuts the heel of the foot F, preventing the sock 1 from shifting or falling off the foot F.

[0043] The material of the anti-slip portion 4 is not particularly limited as long as it has a higher frictional resistance than the fabric constituting the side portion 3. For example, various materials can be used except for resins having a relatively high frictional resistance against the skin (natural resins such as natural rubber, synthetic resins such as silicone rubber and polyurethane rubber).

[0044] The highly stretchable portion 5 is a region or component that is less stretchable than the fabric forming the side portion 3. The highly stretchable portion 5 is less likely to stretch than the fabric forming the side portion 3 and has a stronger contraction force. The highly stretchable portion 5 is located on both sides of the side portion 3 in the width direction (the two side edges 33).

[0045] During walking or other activities, when the metatarsophalangeal joint on the toe side of the foot F flexes (when only the toe side touches the ground and the heel side floats), the highly stretchable portion 5 acts to pull the heel portion 32 toward the toe portion 31. As a result, the heel portion 32 adheres to the skin, reducing the risk of the sock 1 shifting or falling off during walking.

[0046] Furthermore, when the metatarsophalangeal joint is flexed (refractionated), the heel portion 32 is pulled toward the toe portion 31, and the anti-slip portion 4 provided on the inner surface of the heel portion 32 is pressed against the skin. This enhances the anti-slip effect of the anti-slip portion 4, and more effectively reduces the sock 1 from shifting or falling off during walking.

[0047] (Structure of the Strong Elasticity Section)

[0048] Figure 2 1 is a side view of the inside of the foot (right foot) F showing the sock 1 worn on the foot F. Figure 2 As shown, one end 5a of the highly stretchable portion 5 is connected to the peripheral edge of the opening 3a. Furthermore, the other end 5b of the highly stretchable portion 5, opposite to the one end 5a, is connected to the sole 2. The highly stretchable portion 5 is inclined toward the toe portion 31, starting from the one end 5a, and extends linearly from the one end 5a toward the sole 2, reaching the sole 2.

[0049] Figure 3 1 is an exploded view showing the fabric pattern constituting the sock 1. Figure 3 301 represents the fabric pattern (inner surface) of the sole 2. Figure 3 Reference numeral 302 indicates a fabric pattern (inner surface) of the first stretch fabric 3A including the toe portion 31 in the side portion 3. Figure 3 Reference numeral 303 indicates a fabric pattern (inside) of the second stretch fabric 3B including the heel 32 in the side portion 3 .

[0050] like Figure 3 As shown, the side portion 3 includes a first stretch fabric 3A encompassing the toe portion 31 and a second stretch fabric 3B encompassing the heel portion 32. The first stretch fabric 3A and the second stretch fabric 3B are joined at a joining region B where their ends overlap. In the sock 1, the two straight, band-shaped joining regions B function as the highly stretchable portion 5.

[0051] The method for forming the highly stretchable portion 5 is not particularly limited and can be as follows. For example, the looped stretch fabric constituting the side portion 3 is prepared, pre-designed to be larger by shortening only the overlapping width in the joint region B. This fabric is then cut obliquely at the location where the highly stretchable portion 5 is to be provided. This produces a first stretchable fabric 3A and a second stretchable fabric 3B. Furthermore, the position and oblique angle of the highly stretchable portion 5 ultimately provided on the side portion 3 can be adjusted by varying the position and angle at which the stretchable fabric is cut.

[0052] The resulting first and second stretch fabrics 3A, 3B are overlapped at the cut portions and heat-fused using resin or the like, thereby joining the first and second stretch fabrics 3A, 3B in a joining region B. The joining region B is where the two stretch fabrics are heat-fused using resin or the like, and is less stretchable than other regions of the side portion 3. In this manner, a highly stretchable band-shaped portion 5 can be formed on the side portion 3, extending linearly from one end 5a toward the sole 2 and slanting toward the toe portion 31.

[0053] Alternatively, a fabric different from the fabric constituting the side portion 3 or a sheet of resin may be attached to the side portion 3 using an adhesive or heat-welding, thereby providing the highly stretchable portion 5 on the side portion 3. Alternatively, a resin may be applied to the side portion 3 by screen printing, thereby providing the highly stretchable portion 5 on the side portion 3.

[0054] In the case where a highly stretchable portion 5 made of a fabric or resin different from that constituting the side portion 3 is provided on the side portion 3, the highly stretchable portion 5 may be provided on either the inner surface or the outer surface (back / front) of the side portion 3. When emphasis is placed on the wearing feel, the highly stretchable portion 5 may be provided on the outer surface (front) of the side portion 3. When emphasis is placed on the appearance, the highly stretchable portion 5 may be provided on the inner surface (back) of the side portion 3. However, when the highly stretchable portion 5 is provided on the inner surface of the side portion 3, the highly stretchable portion 5 comes into contact with the skin. Therefore, when the highly stretchable portion 5 is provided on the inner surface of the side portion 3, it is preferable to avoid using hard raw materials or plasticized adhesives that may cause a foreign body sensation when the sock 1 is worn.

[0055] The degree of stretchability of the highly stretchable portion 5 is not particularly limited; it can be any portion that has a lower stretchability than the fabric forming the side portions 3. However, if the stretchability of the highly stretchable portion 5 is too low, the contact with the skin will increase, creating a foreign body sensation. Therefore, the highly stretchable portion 5 preferably has a contraction force that is, for example, at least twice but no more than five times that of the fabric forming the side portions 3. This reduces the risk of the sock 1 falling off without causing a foreign body sensation on the skin.

[0056] Figure 4 : is a side view showing the skeleton when the metatarsophalangeal joint of the foot (right foot) F is flexed. Figure 5 : is a bottom view showing the skeleton of the foot F when the foot (right foot) F is viewed from the instep. Figure 4 and Figure 5 As shown, during walking, the first to fifth metatarsal phalangeal joints (i.e., the joints between the first to fifth metatarsal bones and the proximal phalanges of the foot F) flex, causing only the toe side of the foot F to touch the ground while the heel side is lifted. When the first to fifth metatarsal phalangeal joints flex as described above, the highly stretchable portion 5 is positioned so that the heel portion 32 is pulled toward the toe portion 31.

[0057] Figure 6 This is a side view of the inner side of the foot (right foot) F for explaining the position of the strong stretch portion 5. Figure 6 As shown, the position of the highly stretchable portion 5 most on the heel portion 32 side is defined as a first reference position P1 , and the position of the highly stretchable portion 5 most on the toe portion 31 side is defined as a second reference position P2 .

[0058] In this case, in the medial side view of the foot F, the first reference position P1 is preferably located within a first horizontal interval D1 (in the figure, interval d3 + interval d4 in the anterior-posterior (length) direction of the foot F) extending from the front end of the tibia to the rear end of the calcaneus. Furthermore, the second reference position P2 is preferably located within a second horizontal interval D2 (in the figure, interval d1 + interval d2 + interval d3 in the anterior-posterior direction of the foot F) extending from the first metatarsal head (the front end of the first metatarsal) to the rear end of the tibia.

[0059] When the first reference position P1 is located closer to the toe portion 31 than the front end of the tibia of the foot F, the force exerted by the highly elastic portion 5 on the heel portion 32 toward the toe portion 31 during flexion of the metatarsophalangeal joint is weakened. Furthermore, the portion of the peripheral portion of the wearing opening 3a of the side portion 3 corresponding to the depression in the sole of the foot F (the portion located above the depression in the sole of the foot F) provides relatively low comfort between the skin and the fabric. If the first reference position P1 is included in this low-comfort portion, the highly elastic portion 5 may come into contact with or rub against the skin during walking, which can easily lead to a decrease in wearing comfort. Therefore, it is preferable to configure the highly elastic portion 5 so that the first reference position P1 is located within the first horizontal section D1 extending from the front end of the tibia, where the depression in the sole of the foot becomes shallower, to the rear end of the calcaneus.

[0060] Furthermore, if the second reference position P2 is located further to the toe portion 31 than the first metatarsal head of the foot F, the first metatarsophalangeal joint associated with walking may be difficult to flex, potentially causing discomfort or hindering walking. Therefore, to minimize the impact on the flexion of the first metatarsophalangeal joint, the second reference position P2 is preferably located further to the heel portion 32 than the first metatarsophalangeal joint in a medial side view of the foot F, that is, further to the heel portion 32 than the first metatarsophalangeal joint head of the foot F.

[0061] Furthermore, the second reference position P2 is more preferably located within the third horizontal interval D3 (interval d2 + interval d3 in the anterior-posterior direction of the foot F in the figure) extending from the base of the first metatarsal bone of the foot F to the rear end of the tibia. By bringing the second reference position P2 closer to the heel 32, the force pulling the heel 32 toward the toe 31 is strengthened. Furthermore, by being separated from the first metatarsophalangeal joint, the effect on the flexion of the first metatarsophalangeal joint is reduced. Therefore, the second reference position P2 is more preferably located within the third horizontal interval D3.

[0062] Furthermore, one end 5a of the highly stretchable portion 5 need only be located at the periphery of the wearing opening 3a and need not necessarily reach the wearing opening 3a. Similarly, the other end 5b of the highly stretchable portion 5 need only be located near the sole 2 and need not necessarily reach the sole 2.

[0063] (Effect of strong stretch section)

[0064] Figure 7 FIG. 1 is a side view of the inner side of the foot (left foot) F showing the state of the foot F when walking. Figure 7 As shown in FIG701, the foot F touches the ground with the heel (only the heel side touches the ground and the toe side floats). Figure 7 As shown in 702, the center of gravity moves to the toe side of the foot F (the toe side and the heel side are on the ground). Figure 7 As shown in 703, the person moves forward by pushing off the ground with the sole of the foot on the toe side (a state in which only the toe side touches the ground and the heel side floats).

[0065] Figure 8 : is a side view of the inside of the foot F showing the state of the sock 1 when the metatarsophalangeal joint is not flexed (extended). Figure 9 It is a medial side view of the foot F showing the state of the sock 1 when the metatarsophalangeal joint is flexed.

[0066] like Figure 8 As shown, when the metatarsophalangeal joints are not flexed (e.g. Figure 7 (e.g., the positions 701 and 702 of the FIGURES 701 and 702), the effect of the highly elastic portion 5 on pulling the heel 32 toward the toe 31 is minimal. Therefore, compared to conventional methods where a high-fastening portion is provided along the periphery of the wearing opening, the heel of the foot F is not permanently held in place, and the heeling effect is not lost. Therefore, when the metatarsophalangeal joint is not flexed, the highly elastic portion 5 does not impair the wearing feel.

[0067] On the other hand, Figure 9 As shown, when the metatarsophalangeal joint is flexed, as the fabric constituting the side portion 3 stretches in the front-back direction, the tensile force (in the figure, reference symbol "f") of the strong stretch portion 5 that stretches the heel portion 32 toward the toe portion 31 increases. Figure 7 Take this as an example to illustrate, then the foot F Figure 7 As the position shown in 702 transitions to 703, the weight shifts to the toes, causing the heel to gradually rise. As the heel gradually rises, the fabric forming the side portion 3 (side edge portion 33) stretches forward and backward along with the fabric forming the sole 2. As the fabric forming the side portion 3 stretches forward and backward, the highly stretchable portion 5 contracts, increasing the tensile force f.

[0068] By increasing the tensile force f, the wearing pressure of the heel portion 32 against the skin increases, suppressing displacement caused by walking and by friction between the sock 1 and the shoe. Therefore, the highly stretchable portion 5 can reduce the risk of the sock 1 falling off when the metatarsophalangeal joint flexes. Furthermore, as the highly stretchable portion 5 tilts toward the toe portion 31 from the periphery of the wearing opening 3a toward the sole 2, the wearing pressure of the fabric against the skin increases, particularly in the upper portion (near the wearing opening 3a) of the rearward-protruding heel portion 32. This effectively reduces the risk of the fabric of the heel portion 32 shifting downward and falling off.

[0069] As described above, the tensile force f of the highly stretchable portion 5, which pulls the heel portion 32 toward the toe portion 31, increases when the metatarsophalangeal joint is flexed, and acts to adhere the heel portion 32 to the skin. Therefore, according to this embodiment, a sock 1 can be realized that not only suppresses the feeling of tightness when the metatarsophalangeal joint is not flexed, but also reduces displacement caused by movements such as walking.

[0070] Furthermore, the highly stretchable portions 5 are preferably disposed on both sides of the side portion 3 in the width direction, i.e., on the left and right sides of the side portion 3, so as to stretch the heel portion 32 toward the toe portion 31 from both sides. Thus, as the fabric constituting the side portion 3 stretches in the front-to-back direction when the metatarsophalangeal joint is flexed, the heel portion 32 can be appropriately stretched toward the toe portion 31.

[0071] Furthermore, to improve the wearing feel, the highly stretchable portion 5 is designed to have an asymmetrical shape that conforms to the shape of the foot F, and the shape of the side portion 3 is also asymmetrical. Therefore, the highly stretchable portion 5 on the big toe side is positioned slightly closer to the heel portion 32 than on the toe side. However, the sole portion 2 and side portion 3 do not necessarily need to be asymmetrical to the shape of the foot F; they can also be symmetrical. In this case, the highly stretchable portion 5 also stretches the heel portion 32 toward the toe portion 31 to maintain good left-right balance. Ideally, the left and right portions are positioned with the center line of the foot F in the longitudinal (front-back) direction as the boundary.

[0072] Furthermore, as described above, the highly stretchable portion 5 increases the tensile force pulling the heel 32 toward the toe 31 as the fabric forming the side portion 3 stretches in the front-to-back direction when the metatarsophalangeal joint is flexed. Therefore, the highly stretchable portion 5 need only be provided on at least the side portion 3 and need not be provided on the sole 2. However, the highly stretchable portion 5 may also be provided on the sole 2 in addition to the side portion 3. A configuration in which the highly stretchable portion 5 is provided on both the side portion 3 and the sole 2 will be described later.

[0073] (Modification of the Strongly Stretchable Section)

[0074] Figure 10This is an inner side view of the foot F for explaining a modified example of the highly stretchable portion 5. The highly stretchable portion 5 is not particularly limited in shape or number as long as it can substantially exhibit highly stretchable properties compared to the fabric constituting the side portion 3.

[0075] For example, Figure 10 As shown in 1001, the highly stretchable portion 5 may also be a surface shape whose width changes from one end 5a toward the other end 5b. Figure 10 In 1001, the highly stretchable portion 5 is shown as a surface shape in which the width increases from one end 5a toward the other end 5b.

[0076] In addition, if Figure 10 As shown in 1002, the strong expansion and contraction portion 5 may also be linear. Figure 10 In 1002, three parallel line-shaped strong expansion and contraction parts 5 are shown.

[0077] In addition, if Figure 10 As shown in 1003, the strong expansion and contraction portion 5 may also be a point-shaped aggregate. Figure 10 In 1003, the highly stretchable portion 5 is shown as a dot-shaped aggregate having a region with increasing width arranged from one end 5a toward the other end 5b.

[0078] In addition, if Figure 10 As shown in 1004, the strong stretchable portion 5 may also be in the shape of multiple bands. Figure 10 In 1004 , three parallel band-shaped (surface-shaped) highly stretchable portions 5 extending linearly from one end 5 a toward the other end 5 b are shown.

[0079] In addition, if Figure 10 As shown in FIG1005 , the highly elastic portion 5 may be tilted at an angle of 45 degrees or greater relative to the sole 2. As described above, the highly elastic portion 5 only needs to have one end 5a located in the first horizontal section D1 and the other end 5b located in the second horizontal section D2 on the toe portion 31 side relative to the one end 5a. The tilt angle can be set appropriately.

[0080] Furthermore, the present invention can solve the problem of the present invention as long as the highly stretchable portion 5 is included on both sides of the side portion 3. For example, in the case of a configuration in which the ends 5a of the highly stretchable portion 5 are connected to each other by a highly stretchable portion arranged along the peripheral portion of the wearing opening 3a on the heel portion 32 side, Figure 10 Compared to the exemplified configurations (configurations in which one ends 5a are not connected), the foot F is more secure when the metatarsophalangeal joint is not flexed. However, even in the configuration in which one ends 5a are connected, the tensile force f exerted by the highly elastic portion 5 increases when the metatarsophalangeal joint is flexed. Therefore, the sense of securement to the foot F when the foot is not flexed is not increased, and the sock can be less likely to shift or fall off during walking.

[0081] Implementation Method 2

[0082] For other embodiments of the present invention, refer to Figure 11 For the sake of convenience, components having the same functions as those described in the above embodiment are denoted by the same reference numerals, and their description will not be repeated.

[0083] The sock of the present embodiment mainly differs from the sock of the first embodiment in that the highly stretchable portions respectively arranged on both sides of the side portions in the width direction are connected to each other at the sole of the foot.

[0084] (Structure of the Strong Elasticity Section)

[0085] Figure 11 1 is a perspective view showing a state where the sock 11 of this embodiment is worn on the foot F. Figure 11 As shown, the sock 11 is provided with a highly stretchable portion 51 over the side portion 3 and the sole 2. The highly stretchable portion 51 is formed by connecting the highly stretchable portions 5 on both sides of the side portion 3 via the sole highly stretchable portion 6 on the sole 2.

[0086] The method for forming the highly stretchable portion 51 is not particularly limited, and can be formed, for example, in the following manner. For example, if the sock 11 is knitted, the highly stretchable portion 51 can be formed by inserting a highly elastic yarn, which exhibits high stretchability during knitting, into the location where the highly stretchable portion 51 is to be located. Alternatively, the highly stretchable portion 51 can be formed by reducing the stitch density (knit stitches) at the location where the highly stretchable portion 51 is to be located, or by performing tuck knitting at the location where the highly stretchable portion 51 is to be located, thereby changing the stitch structure of the highly stretchable portion 5.

[0087] (Effect of strong stretch section)

[0088] When the metatarsophalangeal joint flexes, the highly stretchable portion 51 increases the tensile force f pulling the heel portion 32 toward the toe portion 31 as the fabric of the side portion 3 stretches in the front-to-back direction. This increases the wearing pressure of the heel portion 32 against the skin, reducing the chance of the sock 1 shifting or falling off.

[0089] Furthermore, in the highly stretchable portion 51, the highly stretchable portions 5 are connected by the sole highly stretchable portion 6, so relative positional displacement of the highly stretchable portions 5 is less likely to occur. Therefore, according to this embodiment, a sock 11 can be realized that can reduce displacement or detachment caused by walking or other movements for a long period of time.

[0090] The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical claims. Embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention.

[0091] Description of Reference Signs

[0092] 1, 11: Socks

[0093] 2: Sole of foot

[0094] 3: Side face

[0095] 4: Anti-slip part

[0096] 5, 51: Strong stretch part

[0097] 5a: One end

[0098] 6: Strong stretch part on the sole of the foot (strong stretch part)

[0099] 31: Toes

[0100] 32: Heel

[0101] 3A: The first stretch fabric

[0102] 3B: Second stretch fabric

[0103] D1: First horizontal interval

[0104] D2: Second horizontal interval

[0105] D3: The third horizontal interval

Claims

1. A sock, characterized in that include: the sole of the foot, covering the ball of the foot; The elastic side portion includes a toe portion and a heel portion and is formed with an opening serving as a wearing opening; as well as A highly stretchable portion having a lower stretchability than the side portion, one end of which is located at a peripheral portion of the opening, the other end of which is located opposite to the one end and connected to the sole of the foot, and which extends from the one end toward the sole of the foot in an inclined direction toward the toe portion; The strong expansion and contraction parts are respectively arranged on both sides of the width direction of the side part, and the one end of the strong expansion and contraction part arranged on one of the two sides is not connected to the one end arranged on the other side of the two sides, and The highly stretchable portion stretches the heel toward the toe when the metatarsophalangeal joint of the foot is flexed. In medial side view of the foot, When the position of the one end of the highly elastic portion most located on the heel side is defined as a first reference position and the position of the other end of the highly elastic portion most located on the toe side is defined as a second reference position, The first reference position is located within a first horizontal interval from the front end of the tibia of the foot to the rear end of the calcaneus of the foot, and The second reference position is located in a second horizontal section including a first metatarsal head and a rear end of the tibia of the foot.

2. The sock according to claim 1, characterized in that: In medial side view of the foot, The second reference position is located in a third horizontal section including a bottom of the first metatarsal bone of the foot to a rear end of the tibia.

3. The sock according to any one of claims 1 to 2, characterized in that: The highly stretchable portion is in a continuous surface shape.

4. The sock according to claim 3, characterized in that: The highly stretchable portion is in the shape of a strip extending substantially linearly.

5. The sock according to any one of claims 1 to 2, characterized in that: The side portion includes: a first stretch fabric including the toe portion, and a second stretch fabric including the heel portion. The highly stretchable portion is formed by overlapping the first stretchable fabric and the second stretchable fabric.

6. The sock according to any one of claims 1 to 2, characterized in that: The side panels comprise free cut fabric.

7. The sock according to any one of claims 1 to 2, characterized in that Further including: The anti-slip portion is arranged on the inner surface of the heel portion.

8. The sock according to any one of claims 1 to 2, characterized in that: The highly stretchable portions respectively arranged on both sides of the side portion are connected to each other at the sole of the foot.

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