socks

Abstract

To provide socks that can suppress slippage between the heel and the heel support portion. [Solution] The sock 152 is suitable for shoes and has a heel cover portion that has rigidity so as not to buckle in the vertical direction even when weight is applied, and has a sliding inclined portion at the top that slopes downward toward the instep cover portion, and a downward blocking portion that is opposite to the upward heel portion 126u of the heel portion 126 that continues below the sliding inclined portion. The sock has an instep side portion that covers the instep 108 and the side of the foot 1, a heel cover portion 158 that covers the heel, and an ankle cover portion 164 that is connected to the sole portion and the heel cover portion. An anti-slip portion 172 is provided on the outer surface of the heel cover portion above the last end of the heel, and since the anti-slip portion protrudes toward the heel restraint portion, when the heel lifts up from the insole during walking, the anti-slip portion comes into contact with the heel restraint portion and the sliding resistance increases, so that slippage with the downward blocking portion is suppressed and discomfort during walking is suppressed.

Description

Technical Field

[0001] The present invention relates to socks. In particular, the present invention relates to a sock suitable for shoes that can be put on without loosening shoelaces and without manual operation. In the following description, names using numerals such as first and second are used for the convenience of explanation to avoid confusion within the same name, and do not affect the interpretation of rights.

Background Art

[0002] In recent years, shoes that can be put on simply by sliding the foot in without manual operation have been growing in popularity. This type of shoe has a built-in hard plate like a shoehorn at the heel part, and when a foot is inserted, the heel slides in naturally due to the inclination based on the downward inclined portion of the hard plate. This hard plate retains its shape without breaking even when a load is applied, so that the shoe opening does not collapse (see, for example, Japanese Unexamined Patent Application Publication No. 2024-116125).

[0003] This type will be described with reference to Figures 10 to 12 showing a sneaker 101 as an example of the shoe 100. The sneaker 101 is generally composed of a sole portion 102 that constitutes the shoe sole, an upper portion 106 that covers the upper side of the foot 104, and a tightening portion 112 that tightens the instep 108 of the foot 104.

[0004] The sole portion 102 is composed of a midsole 114 and an outsole 116. The upper portion 106 is composed of a toe cover portion 122 that covers the toe portion 118 of the foot 104, an outer shoe cover portion 124o and an inner shoe cover portion 124i that cover the left and right sides 120 of the foot 104, a heel cover portion 128 that is connected to the outer shoe cover portion 124o and the inner shoe cover portion 124i and covers the heel portion 126, an upper shoe cover portion 134 that is connected to the outer shoe cover portion 124o and the inner shoe cover portion 124i and covers the instep portion 108, and the toe cover portion 122, the outer shoe cover portion 124o and the inner shoe cover portion 124i, and a fastening portion 112. The lower ends of the toe cover portion 122, the outer shoe cover portion 124o, the inner shoe cover portion 124i, and the heel cover portion 128 are fixed to the upper outer surface of the sole portion 102. The outer shoe cover portion 124o and the inner shoe cover portion 124i are collectively referred to as the shoe side cover portion 124. As a result, the shoe side cover portion 124, the shoe heel cover portion 128 and the shoe instep cover portion 134 form an opening 138 for inserting the foot above the sole portion 102, and together with the toe cover portion 122, they constitute a foot-holding space 140. The bottom surface of the foot-holding space 140 is defined by the insole 136 placed on the upper surface of the midsole 114.

[0005] The heel cover portion 128 corresponds to the so-called heel cup and has rigidity that prevents buckling in the vertical direction even when the wearer puts weight on it. As shown in Figure 10(C), it is configured with a sliding inclined portion 141 that slopes downward toward the upper part of the upper part cover portion 134, a downward blocking portion 143 that follows the sliding inclined portion 141 and is opposite to the upward heel portion 126u of the heel portion 126, and a heel holding portion 145 that is continuous with the lower part of the downward blocking portion 143.

[0006] The shoe heel cover portion 128 is composed of, for example, a heel cover outer shell portion 129 molded from resin and having a predetermined rigidity, and a heel cover inner portion 130 positioned inside the heel cover outer shell portion 129, as shown in Figures 11(A) and (C).

[0007] The heel cover outer shell portion 129 is formed as an outer shell slide inclined portion 129s, which is vertically trough-shaped overall and whose upper end is formed in the shape of a semi-funnel slide inclined portion 141. It is composed of an outer shell stopping portion 129p connected below the outer shell slide inclined portion 129s, and an outer shell holding portion 129h connected below the outer shell stopping portion 129p. The outer shell slide inclined portion 129s is semi-funnel-shaped, located lower towards the inside, and is formed as an outer shell slide slope 131s, which is an inclined surface that slopes downward toward the front towards the upper part cover portion 134. This outer shell slide slope 131s may be a combination of multiple straight lines or a curve. In other words, the outer shell sliding inclined portion 129s is formed as an arc-shaped outer shell sliding slope 131s that descends as it approaches the upper part covering portion 134 from the heel side. The first tangent TL1 to the central part of the outer shell sliding slope 131s forms a first angle A1 with respect to the horizontal line HL.

[0008] The outer shell blocking portion 129p is connected to the lower end of the outer shell sliding inclined portion 129s and is formed as a downward-sloping surface, or in other words, an outer shell blocking inclined surface 131p that slopes downward toward the upper part covering portion 134, with the lower part moving further away from the upper part covering portion 134. The third tangent line TL3 to the middle part of the outer shell blocking portion 129p intersects the horizontal line HL at a third angle B1.

[0009] The outer shell retaining portion 129h is connected below the outer shell blocking portion 129p and is configured as a semicircular outer shell retaining surface 131h that surrounds the heel portion 126 below the rearmost end 126r of the heel portion 126. Note that, as shown in Figure 12(A), the position of the posterior end 126r of the heel portion 126 and the posterior end 127r of the calcaneus 127 do not necessarily coincide.

[0010] The heel cover inner part 130 is a portion having a predetermined elasticity that is tightly fixed to the upper part cover 134 side of the heel cover outer shell 129, and includes an inner part slide inclined part 130s that is opposite to the outer shell slide inclined part 129s, an inner part downward stopping part 130p that is opposite to the outer shell stopping part 129p, and an inner part heel holding part 130h that is opposite to the outer shell holding part 129h. The lower end of the inner part heel holding part 130h is continuous with the upper end of the insole 136.

[0011] The outer shell blocking portion 129p and the inner downward blocking portion 130p constitute the downward blocking portion 143, and the outer shell holding portion 129h and the inner heel holding portion 130h constitute the heel holding portion 145. The downward blocking portion 143 and the heel holding portion 145 constitute the heel restraint portion 166 (thick line portion). The inner heel restraint surface 168 is the inner surface of the heel restraint portion 166 on the foot holding space 140 side. In other words, as shown in Figure 11(B), the inner downward surface 133p and the inner holding surface 133h are the inner heel restraint surface 168. Therefore, as is clear from Figure 11(A), the heel restraint portion 166 is a roughly vertical surface.

[0012] The interior sliding inclined portion 130s is the part between the upper end and the lower end that is closest to the upper part cover portion 134, and constitutes an upward-sloping interior sliding inclined surface 133s that becomes lower as it approaches the upper part cover portion 134. Therefore, the interior sliding inclined portion 130s constitutes the sliding inclined portion 141 (Figure 10(C)). The interior sliding inclined surface 133s is formed by a combination of planes or arc-shaped surfaces, creating a downward-sloping inclination toward the upper part cover portion 134. In other words, it forms an interior sliding inclined surface 133s that becomes lower as it approaches the upper part cover portion 134, but the second tangent line TL2 to the center of the interior sliding inclined surface 133s intersects the horizontal line HL at a second angle A2. The second angle A2 is smaller than the first angle A1.

[0013] The interior downward blocking portion 130p is continuous with the lower end of the interior sliding inclined portion 130s and forms an interior downward surface 133p that slopes downward as it moves away from the upper cover portion 134. Therefore, the interior downward blocking portion 130p constitutes the downward blocking portion 143. The fourth angle B2 of the fourth tangent line TL4, which is tangent to the central part of the interior downward surface 133p, with respect to the horizontal line HL is smaller than the third angle B1. The interior sliding inclined surface 133s and the interior downward surface 133p are smoothly connected by an arc-shaped surface. The connection portion between the interior sliding inclined surface 133s and the interior downward surface 133p constitutes the interior protrusion 135 that is closest to the upper cover portion 134.

[0014] The heel-holding portion 130h of the inner lining is continuous below the downward-facing blocking portion 130p of the inner lining, and is mostly formed as a vertically arc-shaped inner lining holding surface 133h that is roughly vertical. Therefore, the heel-holding portion 130h of the inner lining constitutes the heel-holding portion 145. The inner part slide inclined portion 130s, the inner part downward blocking portion 130p, and the inner part heel holding portion 130h are integrally formed, and the inner slide inclined surface 133s, the inner downward surface 133p, and the inner holding surface 133h are formed by changing the thickness of the elastic material. Specifically, the lower part of the inner part slide inclined portion 130s and the upper part of the inner part downward blocking portion 130p are formed to be the thickest, and are formed to protrude the most towards the upper part cover portion 134. As is clear from Figure 11(B), the inner part slide inclined portion 130s, the inner part downward blocking portion 130p, and the inner part heel holding portion 130h are configured in a semicircular shape to contact and hold the rear surface, outer surface, and inner surface of the heel portion 126.

[0015] The upper part covering 134 is positioned between the outer part covering 124o and the inner part covering 124i of the shoe, and is relative to the upper part 108; it is the part commonly known as the tongue. The fastening section 112 uses elastic retaining cords 136 that are alternately secured to the ends of the outer shoe cover 124o and the inner shoe cover 124i, thereby bringing the upper ends of the outer shoe cover 124o and the inner shoe cover 124i on both sides of the upper shoe cover 134 closer together with a predetermined force.

[0016] The opening 138 is an elliptical opening in plan view, surrounded by the heel cover portion 128, the outer part cover portion 124o, the inner part cover portion 124i, and the upper end portion of the upper part cover portion 134. Below the opening 138, a foot-holding space 140 is formed, surrounded by the heel cover interior part 130, the outer shoe cover part 124o and the inner shoe cover part 124i, the upper shoe cover part 134, and the toe cover part 122. The surface of the heel cover lining 130 is integrated with a heel knitted fabric 142 made of synthetic fibers, and is configured to allow the sock 152 to slide easily.

[0017] The toe cover portion 122, the shoe side cover portion 124, and the upper cover portion 134 are basically made of a stretchable knitted fabric 144. Furthermore, for reasons of improving strength or design, the outer surfaces of the toe cover portion side portion 122s, the shoe side cover portion portion 124s, and the upper cover portion 134 have synthetic resin or leather sheets 146 integrated onto the knitted fabric surface by adhesive or other means, achieving improved strength and decorative appeal.

[0018] The heel cover outer shell portion 129 and the end faces of the shoe side cover portion 124 are butted together and connected by connecting bands 148 (outer connecting band 148o, inner connecting band 148i) to form the sneaker 101, which is the shoe 100. When wearing sneakers 101 with this structure on a foot 104, first, a conventional sock 150, as shown in Figure 13, is worn on the foot 104. The conventional sock 150 has a nearly constant thickness. Next, the toe portion 118 is inserted into the foot-holding space 140 through the opening 138. As a result, the elastic deformation of the shoe side cover portion 124, the upper cover portion 134, etc. causes the heel portion 126b of the heel portion 126 to rest on the inner sliding slope 133s, as shown in Figure 13(A). Note that in Figure 13(A), etc., the upper cover portion 134, etc. should ideally be shown along the outer surface of the foot 104, but for convenience, they are shown with the foot 104 not inserted, as this does not affect the function and effect of the invention.

[0019] In this state, when the heel portion 126 is pushed downward, the heel underside portion 126b slides downward along the downward slope of the interior sliding incline 133s, causing the heel portion 126 to slide into the foot holding space 140, allowing the shoe to be put on without using hands (Figure 13(B)). At this time, since the heel cover outer shell portion 129 has a predetermined hardness, it does not buckle as the shoe heel cover portion 128.

[0020] After putting on the Sneaker 101, I walk like this. Since sneaker 101 is mass-produced industrially, the shape and dimensions of the heel cover interior 130 are uniquely determined based on measurements of many samples. On the other hand, the shape and dimensions of each part of the foot vary greatly from person to person. Therefore, the shape of the heel cover lining 130 rarely matches the shape of the wearer's foot 104. In particular, when Japanese people wear sneakers 101 made by foreign manufacturers based on samples of foreigners, the shape of the heel cover lining 130 rarely fits the shape of the wearer's foot 104 perfectly. Statistically, even when wearing conventional socks 150, a large gap G often occurs between the downward-facing lining surface 133p and the upward-facing heel portion 126u (Figure 13(B)).

[0021] When walking, if there is a large gap G, the heel portion 126 will move relative to the heel restraint portion 166, and therefore to the inner heel restraint surface 168. In other words, if there is a large gap G between the inner downward surface 133p and the upward heel portion 126u, when the foot becomes rear-footed, the part of the outsole 116 facing the toe portion 118 will make contact with the ground, and the part of the outsole 116 facing the heel portion 126 will lift off the ground. In this process of the heel portion 126 lifting off the ground, the upward heel portion 126u moves relative to the inner downward surface 133p, and as a result, the heel portion 126 will rub against the inner heel restraint surface 168 (inner downward surface 133p and inner retaining surface 133h), which may cause discomfort to the wearer.

[0022] As a first prior art, it is known that an anti-slip portion is provided on the outer surface of the sole of the sock in order to prevent the shoe and sock from slipping (Patent Document 1).

[0023] As a second conventional technique, it is known to provide a non-slip portion on the inner surface of the heel portion of the foot cover in order to prevent the foot cover from slipping off from the heel portion (Patent Document 2).

Prior Art Documents

Patent Documents

[0024]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0025] In the first conventional technique, since the non-slip portion is provided on the outer surface of the sock bottom, there is an advantage that the shoe and the sock are less likely to be displaced in the horizontal direction. However, the displacement (friction) between the upward heel portion 126u of the heel portion 126 and the inner heel restraining surface 168, particularly the inner downward surface 133p, cannot be suppressed.

[0026] In the second conventional technique, since the non-slip portion is provided on the inner surface of the heel portion of the foot cover, there is an advantage that the foot cover can be prevented from slipping off from the heel portion 126. However, there is no non-slip feature on the surface of the heel portion of the foot cover that contacts the inner surface of the shoe, and the displacement (friction) between the upward heel portion 126u and the inner heel restraining surface 168, particularly the inner downward surface 133p, cannot be suppressed.

[0027] An object of the present invention is to provide a sock that can suppress the displacement (friction) between the heel portion and the inner heel restraining surface and reduce discomfort. Specifically, it is to provide a sock that can reduce discomfort by more effectively suppressing the displacement (friction) between the upward heel portion of the heel portion and the inner downward surface.

Means for Solving the Problems

[0028] To achieve this object, the present invention is configured as follows. A sock having at least an instep-side covering portion that covers the instep and side of the foot, a heel covering portion that covers the heel, a sole covering portion, and an ankle covering portion connected to the instep-side covering portion and the heel covering portion, wherein in a longitudinal cross-section, the horizontal line of the last end of the heel Having an upward-facing surface positioned above The anti-slip portion and the sliding portion and flat portion, which are located lower towards the heel relative to the horizontal line at the very back of the heel, form a horizontal triangular shape, and the band-shaped protrusions that extend continuously to the left and right of the vertical line at the very back of the heel are such that the flat portion is on the outer surface of the heel cover portion. Seized The sock is characterized in that the slip portion is provided in a triangular shape protruding from the heel cover portion, the slip portion is formed as an inclined surface that does not easily resist the downward movement of the heel portion of the foot when the heel cover portion is in contact with the heel restraint portion of the shoe, and the anti-slip portion comes into contact with the heel restraint portion of the shoe to suppress the upward movement of the heel portion relative to the shoe.

[0029] The second invention is structured as follows: The anti-slip portion is located on the heel cover portion of the shoe opposite the heel restraint portion. Seized These socks are characterized by being provided in this way.

[0030] The third invention is structured as follows: The anti-slip portion is located on the outer surface of the heel cover portion above the horizontal line of the heel's rearmost end that passes through the rearmost end of the heel portion. Seized These socks are characterized by being provided in this way.

[0031] The fourth invention is structured as follows: The anti-slip portion is the heel department Heel at the very back, upright position line The sock is characterized by being formed in a horizontally elongated band shape that extends continuously from left to right, and by being positioned so that the anti-slip portion contacts the heel restraint portion of the shoe when the heel of the foot leaves the insole of the shoe during walking.

[0032] The fifth invention is structured as follows: On the left and right sides of the last end of the heel portion A continuously extending horizontal The aforementioned Anti-slip part It is provided symmetrically with respect to the vertical line at the rearmost end of the heel. These socks have the following characteristics.

[0033] The sixth invention is structured as follows: The aforementioned Anti-slip part This is a protrusion that extends away from the outer surface of the heel cover portion. It is formed in ru that These are distinctive socks.

[0034] The seventh invention is structured as follows: The aforementioned protrusion extends in the left-right direction along the vertical line at the rearmost end of the heel. Anti-slip part Includes nothing These socks have the following characteristics.

[0035] The eighth invention is structured as follows: The aforementioned protrusion is the vertical end of the heel. line The sock is characterized by including the anti-slip portion and the slip portion that extend in the left-right direction.

[0036] The ninth invention is structured as follows: The aforementioned protrusions are characterized by being multiple in number.

[0037] The tenth invention is structured as follows: The aforementioned protrusions are made of a high-friction material, which is a characteristic feature of these socks.

[0038] The eleventh invention is structured as follows: The aforementioned high-friction material is one of polyurethane, silicone resin, polyvinyl chloride, polyamide elastomer, polyester elastomer, rubber elastomer, olefin elastomer, polyethylene, polypropylene, nylon, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and acrylic resin, and is characterized by being a sock.

[0039] The twelfth invention is structured as follows: The sock is characterized in that the heel cover portion is formed in a part that is thinner than other parts of the heel cover portion, and the protrusion is provided on the outer surface of the thin portion.

[0040] The 13th invention is structured as follows: The support piece has a transverse triangular shape in its longitudinal cross-section, consisting of a sliding portion, an anti-slip portion, and a flat portion. The sliding portion is made of a low-friction material, the anti-slip portion is made of a high-friction material, and the flat portion is fixed to the outer surface of the heel cover portion. department These socks are characterized by being positioned in a protruding manner. [Effects of the Invention]

[0041] In the present invention, an anti-slip portion is provided on the outer surface of the heel cover portion. Therefore, the anti-slip part of the sock faces the heel-holding part with a gap in between. When the heel moves upward, the anti-slip portion comes into contact with the heel restraint portion, suppressing slippage between the heel and the heel restraint portion. This has the advantage of suppressing slippage between the heel and the heel restraint portion, thereby reducing discomfort. [Brief explanation of the drawing]

[0042] [Figure 1] Figure 1 is an explanatory diagram of a sock according to Embodiment 1 of the present invention, where (A) is a front view, (B) is a left side view, (C) is a cross-sectional view along line CC in (B), (D) is an enlarged front view of the protrusion, (E) is a cross-sectional view along line EE in (D), (F) is another example of the anti-slip portion, and (G) is yet another example of the anti-slip portion. [Figure 2] Figure 2 is an explanatory diagram of wearing socks according to Embodiment 1 of the present invention and then wearing sneakers as shoes, where (A) is a cross-sectional explanatory diagram when the rearmost end of the heel portion is in contact with the interior protrusion, and (B) is a cross-sectional explanatory diagram when the protrusion is in contact with the interior protrusion. [Figure 3]Figure 3 is an explanatory diagram of the function of the sock according to Embodiment 1 of the present invention, where (A) is a cross-sectional view with sneakers on, and (B) is a cross-sectional view with the heel of the hind foot slightly lifted from the insole while walking. [Figure 4] Figure 4 shows a sock according to Embodiment 2 of the present invention, where (A) is a front view, (B) is a right side view, (C) is a front view of the anti-slip portion, (D) is a cross-sectional view of line DD in (C), and (E) is a cross-sectional view of another example of the anti-slip portion. [Figure 5] Figure 5 is an explanatory diagram showing how to wear sneakers as shoes while wearing socks according to Embodiment 2 of the present invention, where (A) is a cross-sectional explanatory diagram when the anti-slip portion is in contact with the interior protrusion, and (B) is a cross-sectional explanatory diagram when the protrusion is in contact with the heel restraint portion. [Figure 6] Figure 6 is an explanatory diagram of wearing socks according to Embodiment 2 of the present invention and then putting on sneakers as shoes, and is a cross-sectional explanatory diagram of when the sliding part is in contact with the interior protrusion. [Figure 7] Figure 7 shows a sock according to Embodiment 3 of the present invention, where (A) is a front view and (B) is a right side view. [Figure 8] Figure 8 is an explanatory diagram of the sock according to Embodiment 4 of the present invention, where (A) is a front view, (B) is a left side view, (C) is a cross-sectional view along line CC in (B), and (D) is a cross-sectional view with sneakers on. [Figure 9] Figure 9 is an explanatory diagram of wearing socks according to Embodiment 4 of the present invention and then wearing sneakers as shoes, where (A) is a cross-sectional explanatory diagram of the state in which the toes are inserted into the foot-holding space from the opening, and (B) is a cross-sectional explanatory diagram of the state in which the sneakers are being worn. [Figure 10] Figure 10 shows a conventional left-foot sneaker, where (A) is a top view, (B) is a front view, and (C) is a cross-sectional view of the left foot wearing the shoe. [Figure 11] Figure 11 shows a conventional sneaker, where (A) is a longitudinal section diagram, (B) is a perspective view of the heel cover, (C) is a horizontal section of the heel cover, (D) is a section of the DD line in Figure 10(B), and (E) is a section of the EE line in Figure 10(B). [Figure 12] Figure 12 shows the foot of a wearer, with (A) being a longitudinal section and (B) being a left lateral view. [Figure 13] Figure 13 is an explanatory diagram of how to wear shoes with conventional socks, where (A) is a cross-sectional view of the foot inserted into the foot-holding space through the opening, and (B) is a cross-sectional view of the foot wearing the shoe. [Modes for carrying out the invention]

[0043] An embodiment of the sock according to the present invention is a sock having at least an instep-side covering portion that covers the instep and side of the foot, a heel covering portion that covers the heel, a sole covering portion, and an ankle covering portion connected to the instep-side covering portion and the heel covering portion, characterized in that an anti-slip portion is provided on the outer surface of the heel covering portion. Furthermore, it is preferable that the anti-slip portion is provided on the heel cover portion of the shoe, opposite the heel restraint portion. Furthermore, it is preferable that the anti-slip portion is provided on the heel cover portion above the horizontal line of the rearmost end of the heel portion that passes through the rearmost end of the heel portion. Furthermore, it is preferable that the anti-slip portion is provided on both sides of the vertical line of the rearmost end of the heel that passes through the rearmost end of the heel portion. Furthermore, it is preferable that the anti-slip portions provided on the left and right sides of the rearmost end of the heel portion are provided symmetrically with respect to the vertical line of the rearmost end of the heel. Furthermore, it is preferable that the anti-slip portion is a convex portion that protrudes in a direction away from the outer surface of the heel cover portion. Furthermore, it is preferable that the protrusion includes an upward-facing surface extending in the left-right direction from the vertical line at the rearmost end of the heel, and that the upward-facing surface constitutes an anti-slip portion. Furthermore, it is preferable that the protrusion has an upward-facing surface and a downward-facing surface that extend in the left-right direction in the vertical line of the last end of the heel, with the upward-facing surface forming an anti-slip portion and the downward-facing surface forming a sliding portion. Furthermore, it is preferable that there be multiple protrusions. Furthermore, it is preferable that the protrusions are made of a high-friction material. Furthermore, the high-friction material is preferably one of the following: polyurethane, silicone resin, polyvinyl chloride, polyamide elastomer, polyester elastomer, rubber elastomer, olefin elastomer, polyethylene, polypropylene, nylon, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and acrylic resin. Furthermore, it is preferable that the heel cover portion is formed in a thin-walled section that is thinner than other parts of the heel cover portion, and that the protrusions are provided on the outer surface of the thin-walled section. Furthermore, the shoe includes a side cover portion that covers the side of the foot, a heel cover portion connected to the side cover portion that covers the heel, an upper cover portion connected to the side cover portion, and a sole portion connected to the lower part of the side cover portion and the heel cover portion that supports the sole of the foot, with the side cover portion, the heel cover portion and the upper cover portion forming an opening for inserting the foot above the sole portion, and the heel cover portion having rigidity that prevents buckling in the vertical direction even when weight is applied, and the upper part is inclined downward toward the upper cover portion. A sock for shoes having a sliding inclined portion and a downward blocking portion that is adjacent to the upward-facing heel portion following the sliding inclined portion, wherein the sock has an instep side covering portion that covers the instep and side of the foot, a heel covering portion that covers the heel portion, a sole covering portion, and an ankle covering portion that is connected to the instep side covering portion and the heel covering portion, and preferably an anti-slip portion is provided on the rearward-facing upward outer surface above the rearmost end of the heel portion, and the anti-slip portion protrudes toward the downward blocking portion. [Examples]

[0044] First, the socks 152 of Example 1 will be described with reference to Figure 1. The sock 152 of this embodiment 1 includes a toe cover portion 154 that covers the toe portion 118 of the foot 104, an instep side cover portion 156 that covers the instep portion 108 and the side portion 120 of the foot, a heel cover portion 158 that covers the heel portion 126, a sole cover portion 162 that covers the sole portion 110 of the foot, and an ankle cover portion 164 that is connected to the instep side cover portion 156 and the heel cover portion 158. The sock 152 is mass-produced industrially by known methods using a double-cylinder knitting machine or the like with filament yarn, spun yarn or blended yarn such as polyester yarn, nylon yarn, cotton yarn, or polyurethane yarn. In this embodiment 1, it is knitted using a blended yarn of polyester yarn and cotton yarn. In addition, to increase the tightening force on the foot 104, a covering yarn with elastic yarn as the core yarn can also be used.

[0045] First, let's explain the toe cover portion 154. The toe cover portion 154 is formed in a closed-end pouch shape that surrounds the upper and lower parts and tips of the toe portions 118 from the big toe to the little toe, as well as the sides of the big toe or the little toe, and is generally knitted using interlock knitting (double knitting). Furthermore, the toe cover portion 154 may also be of other forms, such as having separate toe pockets for each of the five toes, or a common toe pocket for the big toe and the other four toes.

[0046] Next, the instep side covering portion 156 will be described. The instep cover portion 156 is formed in a tubular shape to surround and cover the instep portion 108 and arch portion 123 of the foot 104, and is generally knitted using interlock knitting. A ribbed portion (elastic knit portion) can be provided in part of the instep cover portion 156 to tighten around the instep portion 108.

[0047] Next, the heel cover portion 158 will be described. The heel cover portion 158 has the function of covering the heel portion 126. In this embodiment 1, the heel cover portion 158 is knitted by back-and-forth knitting, in which the cylinder of the knitting machine is moved back and forth by half a rotation at a time. To increase cushioning, it is preferable to knit the surface with plain knitting and the back surface with pile knitting.

[0048] Next, the foot sole covering portion 162 will be described. The sole covering portion 162 is the part of the toe covering portion 154, the instep covering portion 156, and the heel covering portion 158 that faces the sole portion 110 and is in contact with the insole 136. It is preferable that the surface is made of plain knit and the back surface is made of pile knit. In this specification, the parts of the toe covering portion 154, the instep covering portion 156, and the heel covering portion 158 that face the sole portion 110 are described as the sole covering portion 162.

[0049] Next, the ankle covering portion 164 will be described. The ankle covering portion 164 is connected to the upper ends of the instep covering portion 156 and the heel covering portion 158, and has the function of preventing the sock 152 from slipping down from the ankle. The ankle covering portion 164 is preferably knitted using interlock knitting, and the upper end is preferably knitted using rib knitting (rubber knitting). When the wearer puts on the socks 152, the toe cover portion 154 fits snugly against the toes 107, the instep cover portion 156 fits snugly against the instep 108 and the side of the foot 120, the heel cover portion 158 fits snugly against the heel 126, and the ankle cover portion 164 fits snugly against the ankle. The divisions of the toe cover portion 154, the instep cover portion 156, the heel cover portion 158, and the ankle cover portion 164 are represented by dashed lines in Figures 1(A) and (C).

[0050] Next, the anti-slip section 172 will be explained. The anti-slip portion 172 is positioned opposite the vertical heel restraint portion 166 (Figure 11(B)) of the heel cover inner part 130 of the sneaker 101, which is opposite the heel cover portion 158 of the sock 152. The anti-slip portion 172 is positioned opposite the heel restraint portion 166 of the sneaker 101, which is composed of an inner heel restraint portion heel holding portion 130h and an inner downward restraint portion downward restraint portion 130p. By contacting the heel restraint portion 166, the anti-slip portion 172 applies a braking force to the heel portion 126 relative to the heel restraint portion 166, thereby suppressing the relative movement. In this embodiment 1, the anti-slip portion 172 is positioned on the rearward-upward outer surface 158u of the heel cover portion 158, opposite the downward-facing blocking portion 130p of the inner part which is the downward-facing blocking portion 143. When the heel portion 126 moves relative to the heel restraint portion 166, the anti-slip portion 172 comes into contact with the downward-facing blocking portion 130p of the inner part, and has the function of suppressing slippage between the sock 152 and the heel restraint portion 166 of the shoe heel cover portion 128. The method of forming the anti-slip portion 172 is not particularly limited and can be formed by a method suitable for the material of the anti-slip portion 172. For example, the anti-slip portion 172 can be molded into a hemispherical shape from silicone rubber, and then adhesive can be applied to the flat part of the anti-slip portion 172 to adhere it to a predetermined location.

[0051] The anti-slip portion 172 is preferably provided on the rearward-upward outer surface 158u of the heel cover portion 158, above the heel end horizontal line HHL that passes through the heel end 126r. The rearward-upward outer surface 158u is the part that faces the upward-facing heel portion 126u of the foot 104. However, the anti-slip portion 172 only needs to be provided on the outer surface of the heel cover portion 158 that faces the heel restraint portion 166 when the sneaker 101 is worn. This is because the heel restraint portion 166 is in contact with the anti-slip portion 172 to suppress slippage between them as much as possible. Since the heel restraint portion 166 is mostly upright, when the heel portion 126 is moved relative to the heel restraint portion 166 so that it moves away from the insole 136 of the sneaker 101, the anti-slip portion 172 is subjected to braking force by the heel restraint portion 166, suppressing slippage between the sneaker 100 and the heel portion 126.

[0052] The anti-slip portion 172 is preferably made of a high-friction material. This is to suppress slippage between the heel restraint portion 166, or in this embodiment 1, the inner downward surface 133p or the inner retaining surface 133h, and the anti-slip portion 172 as much as possible through contact between them. Examples of high-friction materials include silicone resins, olefin resins, acrylic resins, urethane resins, styrene resins, amide resins, and carbonate resins. Specifically, it is preferable that the material be composed of one of the following: polyurethane, silicone resin, polyvinyl chloride, polyamide elastomer, polyester elastomer, rubber elastomer, olefin elastomer, polyethylene, polypropylene, nylon, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and acrylic resin.

[0053] In this embodiment 1, the high-friction material is made of polyurethane. Among polyurethanes, ether-based polyurethanes are particularly preferred over ester-based polyurethanes because they are resistant to hydrolysis. When forming the anti-slip portion 172 using polyurethane as the material, it is molded by TPU injection molding (thermoplastic polyurethane) or reaction injection molding. When molded by reaction injection molding, a polyol and isocyanate are mixed in a liquid state, injected into a mold, and cured by a chemical reaction.

[0054] In this embodiment 1, the anti-slip portion 172 is composed of a hemispherical portion 176 formed in a hemispherical shape and a flat portion 178 which is the bottom of the hemispherical portion 176, as shown in Figures 1(D) and 1(E). In other words, the anti-slip portion 172 is composed of a convex portion 174 that protrudes in a direction away from the outer surface of the heel cover portion 158. The upward surface 175 of the convex portion 174 constitutes the anti-slip portion 172. The upward surface 175 refers to the portion above the horizontal line HL that passes through the center of the hemispherical portion 176.

[0055] The protruding portion 174 is firmly fixed by applying adhesive to the flat portion 178 and pressing it against the rearward-upward outer surface 158u of the heel cover portion 158 of the sock 152. In addition to adhesive bonding, other methods of fixing the anti-slip portion 172 can be employed, such as heat welding, heat fusion bonding using a polyurethane-based hot melt adhesive that is melted by heat and bonded to the knitted fabric, and bonding using a reactive adhesive that uses a two-component adhesive (isocyanate + polyol) mainly composed of polyurethane resin.

[0056] The fixing position of the anti-slip portion 172 is preferably at least at a location on the heel cover portion 158 opposite the heel restraint portion 166. In particular, it is preferable that the center of the anti-slip portion 172 be located on the rearward-facing upward outer surface 158u, which is perpendicular to the heel rearmost vertical line HVL that passes through the heel rearmost end portion 158r of the heel cover portion opposite the heel rearmost end portion 126r. In other words, the anti-slip portion 172 is provided symmetrically on both sides of the heel rearmost vertical line HVL, which is a perpendicular line passing through the heel rearmost end portion 126r.

[0057] In this embodiment 1, the anti-slip portion 172 is composed of the first anti-slip portion 1721 to the fifth anti-slip portion 1725. However, the first anti-slip portion 1721 is fixed so that its center is located on the vertical line HVL of the last end of the heel, which is perpendicular to the horizontal line HHL of the last end of the heel, the second anti-slip portion 1722 and the third anti-slip portion 1723 are located to the left of the vertical line HVL of the last end of the heel, and the fourth anti-slip portion 1724 and the fifth anti-slip portion 1725 are located to the right of the vertical line HVL of the last end of the heel. The second anti-slip portion 1722 and the fourth anti-slip portion 1724, and the third anti-slip portion 1723 and the fifth anti-slip portion 1725 are each arranged symmetrically on the left and right sides with respect to the vertical line HVL of the last end of the heel. The first anti-slip sections 1721 to the fifth anti-slip sections 1725 will be described individually if it is necessary to explain them separately, and will be described as anti-slip section 172 if individual explanation is not necessary.

[0058] The anti-slip portion 172 may consist only of the first anti-slip portion 1721 as shown in Figure 1(F), or it may be provided with the second anti-slip portion 1722 to the fifth anti-slip portion 1725 without the first anti-slip portion 1721 as shown in Figure 1(G).

[0059] In addition to the hemispherical shape of Example 1, the anti-slip portion 172 can be molded into various shapes such as a star or heart when viewed from the front.

[0060] The size of the anti-slip portion 172 is set to a size (height or width) that provides a sufficient anti-slip effect, based on experimental results. Similarly, when multiple anti-slip portions 172 are provided, the size of the anti-slip portion 172 is determined by considering the combined anti-slip effect of the multiple anti-slip portions 172.

[0061] Next, the function of the sock 152 of Example 1 will be explained with reference to Figure 2. When the wearer puts on socks 152 and inserts the toe portion 118 into the foot-holding space 140 through the opening 138 of the sneaker 101, the elastic deformation of the shoe's side cover portion 124 and upper cover portion 134 causes the heel portion 126b of the heel portion 126 to rest on the interior sliding slope 133s via the sole cover portion 162, as shown in Figure 13(A). In this state, when the heel portion 126 is pushed downward, the heel back portion 126b, and therefore the heel cover portion 158, slides downward along the downward slope of the interior sliding incline 133s, causing the heel portion 126 to slide into the foot holding space 140, allowing the sneaker 101 to be put on without manual manipulation.

[0062] As shown in Figure 2(A), when the heel portion 126, and therefore the rearmost end 158r of the heel cover portion 158, passes the interior protrusion 135, the anti-slip portion 172 provided on the rearward upward outer surface 158u does not come into contact with the heel cover interior portion 130, so the anti-slip portion 172 does not create any resistance. Even if the anti-slip portion 172 comes into contact with the heel restraint portion 166, the downward force of the heel portion 126 is greater than the sliding resistance, so the heel portion 126 can move into the foot holding space 140.

[0063] As shown in Figure 2(B), when the heel portion 126 moves into the foot-holding space 140 and the anti-slip portion 172 comes into contact with the interior protrusion 135, the anti-slip portion 172 may come into contact with the interior protrusion 135. When the anti-slip portion 172 comes into contact with the interior protrusion 135, since the interior protrusion 135 is a substantially vertical surface, even if the anti-slip portion 172 is a high-friction material, the heel portion 126 can move into the foot-holding space 140 with almost no resistance.

[0064] As a result, as shown in Figure 3(A), the foot 104 wearing the sock 152 moves into the foot holding space 140, and the sole portion 110 of the foot 104 is supported by the insole 136 via the sole cover portion 162. The heel portion 126 is also held in contact with the interior holding surface 133h via the heel cover portion 158. In this state, the anti-slip portion 172 is positioned either in contact with the interior downward surface 133p or with a second gap t smaller than the gap G.

[0065] When a gap G exists between the downward-facing interior surface 133p and the upward-facing heel portion 126u, during walking, when the wearer moves their weight to the toes as they move their rear foot, the heel portion 126 will attempt to separate from the insole 136 to the extent permitted by the gap G, with the heel underside 126b moving away from the insole 136. However, since the anti-slip portion 172 protrudes at a predetermined height from the rearward-upward outer surface 158u of the heel cover portion 158 of the sock 152, the anti-slip portion 172 comes into contact with the interior downward surface 133p, or comes into contact with the interior downward surface 133p after moving a distance corresponding to the second gap t (Figure 3(A)), which is shorter than the gap G, and the frictional force suppresses slippage with the interior downward surface 133p, thereby suppressing the amount of lift of the heel portion 126 from the insole 139 (Figure 3(B)). Therefore, the distance over which the heel portion 126 of the heel cover portion 158 and the downward-facing inner surface 133ps slide is reduced, and discomfort is suppressed or eliminated.

[0066] To remove the sneakers 101, the heel portion 126, along with the socks 152, is moved relative to the inner downward surface 133p of the sneakers 101. In other words, the heel portion 126 is lifted away from the insole 136, pulled out from the opening 138, and finally the toes 107 are also pulled out from the opening 138 to remove the sneakers.

[0067] When the heel portion 126 is moved relative to the heel retaining portion 166 (interior retaining surface 133h, interior downward surface 133p) so that it separates from the insole 136 of the sneaker 101, the anti-slip portion 172 comes into contact with the heel retaining portion 166 and slides. Since the anti-slip portion 172 is made of a high-friction material, the resistance to pulling out the heel portion 126 increases. In this case, the shoe can be removed by forcibly moving the heel cover portion 128 by hand. [Examples]

[0068] Next, an embodiment 2 of the present invention will be described with reference to Figure 4. Example 2 is composed of an anti-slip portion 172 and a sliding portion 182. The anti-slip portion 172 not only suppresses discomfort caused by the heel portion 126 lifting away from the insole 136, but the sliding portion 182 makes it even easier for the foot 104 to move into the foot holding space 140 when wearing the shoe 100.

[0069] The anti-slip portion 172 and the sliding portion 182 are provided on the support piece 184 which is a convex portion 174. As shown in Figure 4(D), the anti-slip portion 172 and the sliding portion 182 are each formed in the shape of a right triangle in cross-section, with their short sides connected back-to-back and their long sides aligned in a straight line to form a flat portion 178. Therefore, as shown in Figures 4(C) and (D), the support piece 184 is horizontally elongated ellipse in front view, with the flat portion 178 forming the base in cross-section, and the anti-slip portion 172 and the sliding portion 182 forming the slope in an isosceles triangle shape, with the apex 180 of the triangle smoothly connected by an arc. Thus, the support piece 184 becomes the convex portion 174. As shown in Figure 4(B), the support piece 184 is attached to the heel cover portion 158 symmetrically with respect to the vertical line HVL at the rearmost end of the heel. The upward-facing surface 175, which is the anti-slip portion 172 of the support piece 184, is positioned on the rearward-facing upward-facing outer surface 158u of the heel cover portion 158, and the sliding portion 182 is formed on the downward-facing surface 186. The downward-facing surface 186 is a slope that, when the foot 104 is standing with the sock 152 on, is positioned lower relative to the horizontal line HHL at the rearmost end of the heel as it approaches the heel portion 126. It is preferable that the upward-facing surface 175 is positioned above the horizontal line HHL at the rearmost end of the heel. The sliding portion 182 has the function of reducing the sliding resistance when it comes into contact with the interior sliding inclined surface 133s. Therefore, the sliding portion 182 can be manufactured from a low coefficient of friction material such as PTFE (polytetrafluoroethylene) or UHMWPE (ultra-high molecular weight polyethylene). Thus, the upward surface 175 and the downward surface 186 are made of different materials.

[0070] Next, the action of Example 2 will be explained. When the wearer puts on socks 152 and inserts the toe portion 118 into the foot-holding space 140 through the opening 138 of the sneaker 101, the elastic deformation of the shoe side cover portion 124 and the upper cover portion 134 causes the heel portion 126b of the heel portion 126 to rest on the interior sliding slope 133s via the heel cover portion 158, as shown in Figure 13(A). In this state, when the heel portion 126 is pushed downward, the heel underside portion 126b (heel cover portion 158) slides downward along the downward slope of the interior sliding incline 133s, causing the heel portion 126 to slide into the foot holding space 140, so that the foot 104 fits into the foot holding space 140 and the sneaker 101 can be worn.

[0071] As shown in Figure 5(A), when the rearmost end 158r of the heel cover passes the interior protrusion 135, the downward surface 186 comes into contact with the interior protrusion 135. However, because the downward surface 186 has low frictional resistance, the heel portion 126 can move smoothly into the foot holding space 140. Furthermore, when the wearer walks, when the foot is in the hindfoot position, the heel portion 126b (heel cover portion 158) attempts to separate from the insole 136 within the range where a gap G exists (Figure 5(B)).

[0072] As the heel portion 126 slightly separates from the insole 136, the top portion 180 protrudes backward and upward toward the outer surface 158u at a predetermined height. As a result, the anti-slip portion 172 comes into contact with the heel restraint portion 166 (inner retaining surface 133h, inner downward surface 133p) after moving a distance shorter than the gap G. The high friction suppresses slippage, thus reducing or eliminating discomfort during walking. The support piece 184, which is the convex portion 174, only needs to be positioned opposite the inner heel restraint surface 168 (heel restraint portion 166).

[0073] As shown in Figure 6, when attempting to remove the sneaker 101 by lifting the heel portion 126 away from the insole 136 and pulling it out of the foot-holding space 140, the top portion 180 comes into contact with the downward-facing surface 186 midway through the process, increasing frictional resistance. However, the shoe can be removed by forcibly moving the heel cover portion 128 by hand. Furthermore, as shown in Figure 4(E), extending the anti-slip portion 172 to a part of the downward surface 186 that follows the upward surface 175 can further suppress the amount of lifting. [Examples]

[0074] Next, an embodiment 3 of the present invention will be described with reference to Figure 7. Example 3 is an example in which multiple support pieces 184 from Example 2 are provided, specifically the first support piece 1841 to the third support piece 1843. Since there are multiple support pieces, it is sufficient to have two or more support pieces 184. The first support piece 1841 to the third support piece 1843 each include an upward-facing surface 175 and a downward-facing surface 186. The first support piece 1841 to the third support piece 1843 only need to be positioned on the heel cover portion 158 opposite the inner heel restraint surface 168 (heel restraint portion 166). In this case, it is preferable that at least the uppermost first support piece 1841 has an upward-facing surface 175 located on the rearward-facing upward-facing outer surface 158u. When putting on sneakers 101, the downward surfaces 186 of the first support piece 1841 to the third support piece 1843 come into contact with the interior sliding slope 133s and slide well, which has the advantage of making them easy to put on. On the other hand, when walking, the upward surface 175 comes into contact with the inner retaining surface 133h or the inner downward surface 133p which constitute the heel restraint portion 166, thereby suppressing the lifting of the heel portion 126 and reducing or eliminating discomfort. [Examples]

[0075] Next, an embodiment 4 of the present invention will be described with reference to Figure 8. Example 4 is a modification of Example 1, in which a portion of the rearward-upward outer surface 158u corresponding to the position where the protrusion 174 is provided is configured as a thin-walled portion 188, which is thinner than the other portions. The thin-walled portion 188 can be easily formed by using a double-cylinder knitting machine.

[0076] In Embodiment 4, the thin-walled portion 188 is the portion opposite to the rearward-upward outer surface 158u on which the convex portion 174 is provided, and is configured with a second thickness t2 which is about half the first thickness T (Figure 8(C)) of the other heel covering portion 158. In other words, a third gap s is formed between the inner surface of the thin-walled portion 188 and the outer surface of the heel portion 126. The third gap s is provided on both sides of the vertical line HVL at the rearmost end of the heel within a predetermined length L range.

[0077] Furthermore, the 41st protrusion 1921, which is the protrusion 174, has its center on the vertical line HVL at the very end of the heel and is positioned opposite the thin-walled portion 188. In this embodiment 4, the 42nd protrusion 1922 is located to the left of the 41st protrusion 1921, and the 43rd protrusion 1923 is located to the right, both positioned symmetrically across the vertical line HVL at the very end of the heel and opposite the thin-walled portion 188. There may be four or more protrusions 174, but they can be positioned symmetrically with respect to the vertical line HVL at the very end of the heel and opposite the thin-walled portion 188.

[0078] As a result, when the heel portion 126, and therefore the sole covering portion 162 of the heel covering portion 158, attempts to separate from the insole 136 during walking, the 41st protrusion 1921 to the 43rd protrusion 1923 come into contact with the interior downward surface 133p, creating resistance to movement. This suppresses the movement of the heel portion 126, thereby reducing or eliminating discomfort during walking. Furthermore, when removing the sneaker 101, if the 41st protrusion 1921 to the 43rd protrusion 1923 come into contact with the interior downward surface 133p, the thin-walled portion 188 can bend within the range of the second gap t and move closer to the outer surface of the heel portion 126. This movement reduces the contact pressure between the 41st protrusion 1921 to the 43rd protrusion 1923 and the interior downward surface 133p, reducing the sliding resistance and making it easier to remove the sneaker.

[0079] The embodiments of the present invention are for the purpose of aiding understanding the invention and do not limit the technical scope described in the claims. Various modifications and improvements are possible within the scope of the claims by those skilled in the art. [Explanation of symbols]

[0080] 102 Sole 104 feet 108 Instep 120 Side of the foot 124 Shoe side cover 126 Heel 126u Upward-facing heel 128 Heel cover of shoe 130s Slide Incline 134 Part A Cover 141 Sliding Inclined Section 143 Downward blocking section 145 Heel holding part 156 Covering the side of the instep 152 socks 158u Backward-facing upward-facing outer surface 162 Foot sole cover 164 Ankle covering 166 Heel support section 168 Interior heel support surface 172 Anti-slip part 174 Convex part 175 Upward-facing surface 182 sliding part 188 Thin-walled section HHL Heel rearmost horizontal line HVL Heel rearmost vertical line

Claims

1. A sock (152) having at least an instep side covering portion (156) that covers the instep (108) and side portion (120) of the foot (104), a heel covering portion (158) that covers the heel portion (126), a sole covering portion (162), and an ankle covering portion (164) connected to the instep side covering portion (156) and the heel covering portion (158), In a longitudinal section, the anti-slip portion (172) has an upward-facing surface (175) positioned above the last horizontal line of the heel (HHL), and the sliding portion (182) and flat portion (178) are positioned lower relative to the last horizontal line of the heel (HHL) as they approach the heel portion (126), forming a transverse triangular shape. Additionally, a band-shaped convex portion (174) extending continuously to the left and right of the last vertical line of the heel (HVL) is provided in such a state that it protrudes triangularly from the heel cover portion (158) because the flat portion (178) is fixed to the outer surface of the heel cover portion (158). The sliding portion (182) is formed as an inclined surface that does not easily create resistance to the downward movement of the heel portion (126) of the foot (104) when the heel cover portion (158) is in contact with the heel restraint portion (166) of the shoe (100). When the heel portion (126) attempts to slide upward relative to the shoe (100), the anti-slip portion (172) comes into contact with the heel restraint portion (166) of the shoe (100) to suppress the upward movement. Socks characterized by the following features.

2. The sock according to claim 1, characterized in that the anti-slip portion (172) is fixedly attached to the heel cover portion (158) of the shoe (100) that is opposite to the heel restraint portion (166).

3. The sock according to claim 1 or 2, characterized in that the anti-slip portion (172) is fixedly attached to the outer surface of the heel cover portion (158) above the heel end horizontal line (HHL) passing through the rearmost end of the heel portion (126).

4. The anti-slip portion (172) is formed in the shape of a horizontally elongated band that extends continuously to the left and right of the heel posterior vertical line (HVL) passing through the posterior end of the heel portion (126), When walking, when the heel of the foot (126) lifts off the insole (136) of the shoe (100), The anti-slip portion (172) is positioned to contact the heel rest portion (166) of the shoe (100). The sock according to claim 1 or 2, characterized by being provided.

5. The sock according to claim 4, characterized in that the horizontally elongated anti-slip portion (172) that extends continuously to the left and right of the last end of the heel portion (126) is provided symmetrically with respect to the last vertical line (HVL) of the heel.

6. The sock according to claim 4, characterized in that the anti-slip portion (172) is formed as a convex portion (174) that protrudes in a direction away from the outer surface of the heel cover portion (158).

7. The aforementioned protrusion (174) includes an anti-slip portion (172) that extends in the left-right direction along the vertical line of the last heel end (HVL). The sock according to feature 6.

8. The aforementioned protrusion (174) includes the anti-slip portion (172) and the sliding portion (182) that extend in the left-right direction along the last vertical line of the heel (HVL). The sock according to feature 6.

9. The sock according to claim 6, characterized in that the aforementioned protrusions (174) are multiple.

10. The sock according to claim 6, characterized in that the aforementioned protrusion (174) is made of a high-friction material.

11. The sock according to claim 10, characterized in that the high-friction material is one of polyurethane, silicone resin, polyvinyl chloride, polyamide elastomer, polyester elastomer, rubber elastomer, olefin elastomer, polyethylene, polypropylene, nylon, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, and acrylic resin.

12. The sock according to claim 6, characterized in that the heel covering portion (158) is formed in part as a thin-walled portion (188) that is thinner than other parts of the heel covering portion (158), and the protrusion (174) is provided on the outer surface of the thin-walled portion (188).

13. The support piece (184) has a transverse triangular shape in its longitudinal section, formed by a sliding portion (182), an anti-slip portion (172), and a flat portion (178). The sliding portion (182) is made of a low-friction material, the anti-slip portion (172) is made of a high-friction material, and the flat portion (178) is fixed to the outer surface of the heel cover portion (158), so that it protrudes from the heel cover portion (158). The sock according to feature 1.

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