Traction lug for footwear

Abstract

A lug (1, 1a, 1b) for a sole or an outsole of footwear, i.e. shoes or boots, which is able to improve the traction or grip characteristics of the sole itself; the sole or the outsole is equipped with a plurality of lugs (1, 1a, 1b) and a method for obtaining a mold casting printed with a 3D printer to obtain the sole and / or the lugs (1, 1a, 1b).

Description

Technical Field

[0001] This invention relates to a lug for the sole or outsole of footwear (i.e., shoes, athletic shoes, or boots). In particular, this invention relates to a lug that exhibits improved traction or grip characteristics.

[0002] The present invention also relates to a sole or outsole equipped with at least one and / or more lugs according to the present invention.

[0003] Furthermore, this lug is obtained by casting a mold around the 3D printed part. Background Technology

[0004] 3D printing technology, also known as "additive manufacturing," has experienced tremendous development in the past few years. Generally, this technology can be used to produce three-dimensional objects with complex structures, starting from a 3D "file" generated by appropriate software, and progressing to the production of complete 3D objects, for example, by creating successive layers.

[0005] This construction technique allows for the production of complex structures with any geometry by adding materials possessing desired or ideal properties. This simultaneously increases design / construction freedom and potentially reduces material waste.

[0006] In the footwear industry, particularly in athletic shoes, running shoes, outdoor shoes, work shoes, and safety shoes, a key concern is the need for a product that can adapt well to different foot characteristics and the user's movements, depending on the specific activity being performed.

[0007] In particular, there has been a persistent and greater demand in the footwear industry for soles or outsoles with improved grip and traction, even on slippery, wet, or granular surfaces.

[0008] The most common technique for producing shoe soles or outsoles is the traditional molding technique for elastic materials.

[0009] Furthermore, to date, shoe soles have been produced by molding, gluing, or combining different components, such as uppers, midsoles of varying densities, and any other elements, such as lugs or insoles. These different components, previously obtained in specific molds, were then assembled by gluing or co-molding, thus requiring a large number of machines.

[0010] Therefore, there is a need to produce a sole or outsole for footwear, particularly lugs for soles or outsoles, that can meet the above requirements while allowing for high traction during exercise, such as walking or running or similar activities. Summary of the Invention

[0011] Therefore, the main objective of this invention is to improve the technology of footwear soles or outsoles by producing lugs that have at least improved grip or traction capabilities, even on terrain consisting of granular or permeable surfaces.

[0012] Another advantage of the present invention is that it provides a customizable lug and / or a lug tailored to specific data and requirements based on previous measurements.

[0013] Another objective of the present invention is to provide a sole or outsole for footwear equipped with a plurality of lugs for improving grip or traction on terrain consisting of granular particles or permeable surfaces.

[0014] A further object of the present invention is to provide a mold for at least one lug of a sole or outsole and / or for footwear, which can be produced quickly and easily at a competitive cost.

[0015] According to a first aspect of the invention, and according to the appended claim 1, a lug is provided for the sole or outsole of footwear, i.e., athletic shoes, shoes or boots.

[0016] According to a further aspect of the invention, in accordance with the appended claim 12, a sole or outsole comprising at least lugs is provided.

[0017] A further objective of the present invention is to provide a method for obtaining a mold for producing a sole or outsole and / or at least one lug according to the present invention, and a method for obtaining such a sole or outsole.

[0018] Further advantages or preferred features of the invention are described in the appended dependent claims. Attached Figure Description

[0019] Other features and advantages of the invention will become apparent from the description of embodiments of lugs for soles or outsoles of footwear, which are illustrated by way of example and are not limited to the accompanying drawings, wherein:

[0020] Figure 1 It is a three-dimensional diagram of a type of lug used for the sole or outsole of footwear, used as a control lug during testing;

[0021] Figure 2A-2C Another type of lug for footwear soles or outsoles is shown in a top plan view, as well as its longitudinal and transverse cross-sections (the longitudinal direction runs from the toes to the heel of the corresponding sole or outsole, while the transverse direction runs from one side to the other), which is used as a control lug during testing.

[0022] Figures 3A-3CThe form of the lugs for the sole or outsole of footwear according to the invention is shown in a top plan view and its longitudinal and transverse cross-sectional views (the longitudinal direction is from the toes to the heels of the corresponding sole or outsole, while the transverse direction is from one side to the other). Figures 4A-4C Another type of lug for a sole or outsole according to the invention is shown in a top plan view, and in its longitudinal and transverse cross-sectional views (the longitudinal direction is from the toes to the heels of the corresponding sole or outsole, while the transverse direction is from one side to the other).

[0023] Figure 5 It has Figure 2A-2C A bottom view of the sole of a shoe with multiple lugs used for test control;

[0024] Figure 6 It is with Figures 9A-9C A bottom view of the sole with multiple lugs; Figure 7 It has Figure 1 A bottom view of the sole of a shoe with multiple lugs used for test control;

[0025] Figures 8A-8C The plan view, along with its transverse and longitudinal cross-sections (the longitudinal direction is from the toes to the heel of the corresponding sole or outsole, while the transverse direction is from one side to the other), is shown. Figure 1 The protruding ears;

[0026] Figures 9A-9C Another type of lug for a sole or outsole according to the invention is shown in a top plan view and its transverse and longitudinal cross-sectional views (the longitudinal direction is from the toes to the heels of the corresponding sole or outsole, while the transverse direction is from one side to the other).

[0027] Figure 8D , 9D It shows that it is equipped accordingly. Figure 1 Or the pattern on the sole or outsole with multiple lugs, such as 9A-9C;

[0028] Figure 10 , 11 Figures 1 and 12 illustrate various possible production steps for obtaining the mold for the sole and / or at least one lug of the present invention;

[0029] Figure 13 and 14 A bottom view and a side view of an example of the present invention are shown;

[0030] Figure 15 Another example of the invention is shown. Detailed Implementation

[0031] Referring to the accompanying drawings, reference numeral 1 generally refers to a lug on the sole or outsole of a shoe, i.e., a shoe, athletic shoe, boot, outdoor shoe, or work or safety shoe according to the invention.

[0032] At least one lug 1 and / or multiple lugs 1 of the present invention are disposed on the bottom of the sole to form the upper of the sole or outsole.

[0033] The lugs 1 and the soles and / or outsoles equipped with a plurality of lugs 1 according to the invention have improved grip or traction on terrain consisting of granular particles or permeable surfaces, such as sand, gravel, mulch, soil, snow, etc.

[0034] Therefore, due to the lugs of the present invention, the sole or outsole can provide stability to the user according to the specific footwear worn by the user and the intended movement or action.

[0035] In the following description, the term "sole" may be used alone and always refers to the sole or outsole of footwear.

[0036] In addition, "lower" or "lower" means that the object or component faces or is positioned toward the supporting surface or ground, "upper" or "higher" means that the object or component faces or is positioned toward the user, and "sideways" means that the object or component faces or is positioned inside or laterally relative to the user's feet.

[0037] In addition, "front" or "direct" refers to an object or component facing the user's toes or placed accordingly, while "back" or "rear" refers to an object or component facing the user's heel or placed accordingly.

[0038] According to the invention, the sole, based on a top plan view, has a thickness and elongation that substantially correspond to, or are slightly larger than, conventional soles. The sole according to the invention comprises an upper surface 10 and a lower surface 20, the upper surface 10 being adapted to face the user's foot in use, and the lower surface 20 being adapted to face a resting surface or ground in use.

[0039] The upper surface 10 may be adapted to contact the upper and / or the insole or midsole.

[0040] According to the present invention, the lower surface 20 is provided with at least one and / or a plurality of lugs 1.

[0041] In particular, in at least one embodiment of the invention, the lower surface 20 is directly attached to at least one lug 1, for example by means of a unique molding step.

[0042] The lug 1 includes a first base 2, a second base 3, and a sidewall 4.

[0043] In particular, the first base 2 is lower in use, meaning it is suitable for contact with the ground, while the second base 3 is higher in use, meaning it is stably attached to the lower surface 20 of the sole.

[0044] The second base 3 is opposite to the first base 2, while the sidewall 4 is laterally connected to the first base 2 and the second base 3 and / or the lower surface 20 of the sole.

[0045] A feature of the invention is that the sidewall 4 of the invention has lateral features and / or elements that are very small (compared to the entire sidewall 4 of the lug), and are obtained as better explained below. This contrasts with lugs having smooth sidewalls (such as...). Figure 1 and 8A Compared to the sidewall 40 shown in -8C, these lateral features and / or elements can give the lug 1 and / or sole better traction.

[0046] In fact, such lateral features and / or elements significantly increase the surface area of ​​the sidewall 4, thereby providing better traction and / or grip on terrain consisting of granular particles or permeable surfaces.

[0047] In this embodiment of the invention, these features and / or elements are also present at the first base 2, increasing the surface area of ​​the first base 2.

[0048] The thickness of the sole can be variable. For example, the thickness of the forefoot portion of the sole can be less than the thickness of the heel portion.

[0049] Similarly, the height of the lug (i.e., the distance between the first base 2 and the second base 3) can vary along the sole or between the front and rear of the lug. For example, the height of the lug 1 can be smaller at the front of the sole and larger at the rear.

[0050] In another embodiment of the invention, the thickness of the sole and / or the height of the lug 1 can be the same at both the front and rear portions of the sole itself. According to a specific embodiment of the invention, as shown in the accompanying drawings, the lug 1 has a V-shaped shape in a top plan view. In this case, the first base 2 and the second base 3 also have V-shaped shapes in a top plan view.

[0051] However, the lug 1 can also have different shapes, such as generally prism, cube, parallelepiped, truncated cone or pyramid, regular, irregular, L-shaped, C-shaped, and so on. In this case, the first base 2 and the second base 3 have shapes such as square, rectangle, polygon, parallelogram, regular, irregular, L-shaped, C-shaped, cylindrical, organic, hemispherical, tetrahedral, semi-elliptical, or trapezoidal.

[0052] In a particular embodiment of the invention, as shown in the accompanying drawings, the first base 2 is smaller than the second base 3. Accordingly, the sidewall 4 is inclined and / or tapered, for example, toward a common point. Thus, the surfaces of the sidewall 4 constituting the lug are inclined along a direction converging toward the ground.

[0053] In another embodiment of the invention, the first base 2 and the second base 3 may have the same dimensions, but they may be offset from each other. Accordingly, the sidewall 4 remains inclined. However, in this way, all surfaces constituting the sidewall of the lug 1 are inclined in the same direction. This direction is the direction in which the first base 2 and the second base 3 are offset.

[0054] exist Figure 2A-2C In the example shown, the sidewall 4 of the lug 1b is stepped. It can be a test control lug or the base shape of the lug used in this invention. In this example, the sidewall 4 includes at least one step 4a or at least two steps 4a, and in the illustrated embodiment, three.

[0055] Each step 4a has essentially the same dimensions and / or has sharp or rounded edges, and / or right-angled edges.

[0056] In this embodiment of the invention, the sidewall 4 and / or the step 4a have a plurality of protrusions 4b, such as lateral protrusions 4b.

[0057] For stepped lugs, there may be more features and / or elements. In any case, lug 1 does not necessarily have a stepped structure.

[0058] exist Figures 3A-3C In this, the lateral protrusion 4b has a protruding shape and a base, wherein the protruding shape is approximately hemispherical. The base of each protrusion 4b is attached to the vertical side of the sidewall 4 and / or the step 4a (i.e., the side extending substantially in the direction from the foot to the ground).

[0059] The lateral protrusion 4b can have a protruding shape, such as a faceted hemisphere. Alternatively, the protrusion shape of the protrusion 4b can be a pyramid, a truncated pyramid, a truncated cone, a cone, or a prism, etc.

[0060] According to another type, the lateral protrusion 4b may also exist on the first base 2 of the lug 1 and / or on the horizontal side of the step 4a.

[0061] In the second embodiment of the invention, for example Figures 4A-4C As shown, the sidewall 4 of the lug 1 is stepped. In this type, the sidewall 4 also includes several steps 4a, three in the illustrated type.

[0062] The features of each step 4a are basically the same as those disclosed in the previous models.

[0063] In this embodiment of the invention, the sidewall 4 and / or the step 4a includes a plurality of recesses 4c. Each recess 4c includes an intrusion shape and a base, wherein the base is positioned at the sidewall 4 and / or the step 4a. The intrusion shape may be generally hemispherical, or a faceted hemispherical, or a pyramid, a truncated pyramid, a truncated cone, a conical, or a prism shape.

[0064] In the figure, the notch 4c has a pointed, pyramidal, or rhomboid shape. In a variant of the invention, the notch 4c is hemispherical, while the lateral protrusion 4b has a pyramidal or rhomboid shape, a parallelepiped or rectangular prism, or any other suitable shape.

[0065] like Figure 4C As shown, the base of each notch 4c is positioned on the horizontal side of the step 4a and extends in a substantially vertical direction into the interior of the step 4a and / or the sidewall 4. The apex of the notch 4c is located inside the lug 1.

[0066] In this case, the notch 4c can also be placed at the first base 2 of the lug 1 and / or on the vertical side of the step 4a.

[0067] In this particular type, the presence of the notch 4c can produce the fact that in at least one step 4a, it no longer has a right-angled edge: it acquires a pointed edge, with a sharp or pointed edge at its top portion.

[0068] Figure 5 It shows that according to Figure 2A The type shown is equipped with a sole or outsole A with multiple lugs 1b;

[0069] Figure 6 It shows that according to Figure 9A The type shown is equipped with a sole or outsole B with multiple lugs 1; Figure 7 It shows that according to Figure 1 The type shown is equipped with a sole or outsole C with multiple lugs 1a;

[0070] exist Figure 1 and 8A In -8C, the structure of lug 1a is disclosed, which has an approximate V-shape in the top plan view.

[0071] This structure can also be applied to lug 1 when it has a V-shape.

[0072] In such a lug 1a, as previously disclosed in the lug 1, a first base 2 smaller than the second base 3 is found, and the second base 3 is attached to the lower surface 20 of the sole. Since the first base 2 is parallel to the second base 3 and is symmetrically placed with respect to the second base 3, the sidewalls 4 of the lug are uniformly inclined toward the interior of the lug itself.

[0073] Looking from the front of the sole to the back or heel, the sidewalls 4, 40 of each lug 1, 4a include a first front 6, whose base sides 6a, 6b have a lateral extension relative to the sole.

[0074] The base sides 6a and 6b are parallel to each other, but the top base side 6b (suitable for contact with the ground) is smaller than the bottom base side 6a (attached to the lower surface 20 of the sole). The base sides 6a and 6b are connected by two sides 6c (left) and 6d (right) of the same size but with opposite inclinations, i.e., sides 6c and 6d are inclined toward the smaller base 6b.

[0075] Therefore, the first 6 have a trapezoidal shape.

[0076] The two main side sides 7 and 8 originate from the first front 6, respectively to the left and right of the first front 6.

[0077] Each of the main sides 7 and 8 has the same shape, namely a trapezoidal shape.

[0078] Its extensions point toward the bottom of the sole and toward each side of the sole (left main side 7 points toward the outside of the sole, while right main side 8 points toward the inside of the sole).

[0079] Each main side 7, 8 has corresponding parallel base sides 7a, 7b, 8a, 8b, with the top base sides 7b, 8b (suitable for contact with the ground) smaller than the bottom base sides 7a, 8a (attached to the lower surface 20 of the sole). The base sides 7a, 7b are connected by two sides 7c (left) and 7d (right) of the same size but with opposite inclinations, i.e., sides 7c, 7d slope towards the smaller base side 7b. Side 7d coincides with side 6c.

[0080] The base sides 8a and 8b are connected by two sides 8c (left) and 8d (right) of the same size but with opposite inclinations, i.e., sides 8c and 8d are inclined toward the smaller base side 8b. Side 8c coincides with side 6d.

[0081] The two secondary sides (small sides) 9 and 10 each originate from the left main side 7 and the right main side 8, respectively.

[0082] The secondary sides 9 and 10 have the same shape, namely, a trapezoidal shape.

[0083] Their extensions point towards the bottom of the sole and towards each other. This means that the left secondary side 9 is oriented towards the right secondary side 10, and vice versa.

[0084] Each secondary side 9, 10 has corresponding parallel base sides 9a, 9b, 10a, 10b, with the top base sides 9b, 10b (suitable for contact with the ground) smaller than the bottom base sides 9a, 10a (attached to the lower surface 20 of the sole). The base sides 9a, 9b are connected by two sides 9c (left) and 9d (right) of the same size but with opposite inclinations, i.e., sides 9c, 9d slope towards the smaller base side 9b. Side 7c coincides with side 9c.

[0085] The base sides 10a and 10b are connected by two sides 10c (left) and 10d (right) of the same size but with opposite inclinations, i.e., sides 10c and 10d are inclined toward the smaller base side 10b. Side 10d coincides with side 8d.

[0086] At the end, in order to close or surround the shape of the exposed lug, the sidewall 4 includes two inner surfaces 11, 12.

[0087] Inner surfaces 11 and 12 originate from the left secondary side 9 and the right secondary side 10, respectively. Inner surfaces 11 and 12 are centrally connected to each other.

[0088] Each inner surface 11 and 12 has the same shape, namely a trapezoidal shape.

[0089] Their extensions point towards the front of the sole and towards each other. This means that the left inner surface 11 is oriented towards the right inner surface 12, and vice versa.

[0090] Each inner surface 11, 12 has corresponding parallel bases 11a, 11b, 12a, 12b, with the top bases 11b, 12b (suitable for contact with the ground) being smaller than the bottom bases 11a, 12a (attached to the lower surface 20 of the sole). The bases 11a, 11b are connected by a side 11c (left, coinciding with side 9d) and a common side 13 of the same size but with opposite inclination, i.e., the sides 11c, 13 are inclined toward the smaller base 11b.

[0091] Bases 12a and 12b are connected by a right side 12d (right, coinciding with side 10c) and a common side 13 of the same size but opposite inclination, i.e., sides 12d and 13 are inclined toward the smaller base 12b.

[0092] Sides 6b, 7b, 8b, 9b, 10b, 11b and 12b are connected by the first base 2 of lug 1.

[0093] Obviously, without departing from the scope of the appended claims, the lug 1 can have different shapes and / or orientations, for example... Figure 13-15 As shown in the image.

[0094] Sidewalls 4 and 40 may include front 6, main sidewalls 7 and 8, secondary sidewalls 9 and 10, and inner sidewalls 11 and 12.

[0095] Furthermore, in the overall shape of the already disclosed lugs 1, 1a, the sidewalls 4, 40 can be stepped using the step 4a and / or the lateral features or elements of the present invention.

[0096] For example, such as Figures 9A-9C As shown, this construction of the lug 1 includes both a notch 4c and a protrusion 4b, possessing the features disclosed above. This specific type exhibits better performance in terms of traction or grip.

[0097] If a step 4a exists, a protrusion 4b on one step 4a and a notch 4c on another step 4a can be alternated. Alternatively, a protrusion 4b and a notch 4c can also exist in the same step 4a.

[0098] The protrusion 4b and / or the notch 4c constitute the lateral features or elements in which the features of the present invention are located.

[0099] The present invention also relates to a shoe sole equipped with a plurality of lugs 1, having the features disclosed above.

[0100] In this way, due to the present invention, it is possible to obtain (small) facets and / or features and / or elements on the sidewall 4 of the lug 1, thereby differentiating it from conventional lugs (such as...). Figure 1 Compared to the lug 2A, it provides better traction and / or grip. In fact, the presence of this feature and / or element significantly increases the surface area of ​​the sidewall 4 (compared to the smooth conventional lug 1a), thus providing better traction.

[0101] These features and / or elements are three-dimensional structures, placed or obtained at least at the sidewall 4 of the lug 1.

[0102] These features and / or elements can have any suitable geometric shape, protruding from the lug structure or creating corresponding gaps.

[0103] For example, the surface of a feature and / or element can be hexagonal, circular, more complex shapes, square or rectangular, elliptical, quadrilateral or triangular.

[0104] Furthermore, this lug 1 is obtained in a single molding step, and in at least one embodiment of the invention, it is integrally formed with the sole and / or its lower surface 20. This means that the lug is achieved simultaneously with the sole and is directly attached to the sole (or preferably attached to its lower surface 20).

[0105] Furthermore, the present invention relates to a method for obtaining a mold by which the sole and / or lugs of the present invention can be molded. In particular, it is first possible to determine (e.g., by creating a digital file) the required two-dimensional (2D) structure or pattern for a specific sole and / or lug (see, for example, [link to relevant documentation]). Figure 9D ).

[0106] If necessary, the two-dimensional structure or pattern may also include the position and shape of at least one mark and / or trademark, as indicated by reference numeral 30.

[0107] Next, create the corresponding 3D digital file, such as Figure 10 , 11 As shown in Figures 1 and 12, this 3D file illustrates the amount of space occupied by at least one lug 1, including its shape and sidewalls 4, as well as possible steps 4a, protrusions 4b, and / or recesses 4c. As shown in these figures, the protrusions 4b may also have a pyramidal shape.

[0108] Subsequently, using a 3D printed model, a mold (e.g., a metal mold) for the sole and / or lugs used in this invention can be obtained. As described, the process of printing the casting mold begins with a digital file, followed by solidification, printing, and finally casting the metal mold.

[0109] Following the printing step is the cleaning of the parts (which is irrelevant to the final shape of the solidified sand model). It is clear that the solidified 3D printed model has a complementary shape to the mold, and the mold also has a complementary shape to the sole and / or lugs.

[0110] Following the cleaning step, the next step is to pour material for the mold, such as molten metal. After the molten metal solidifies, the solidified 3D printed model is removed. The mold is then cleaned and prepared for obtaining the sole and / or lugs.

[0111] As a non-limiting example of the present invention, this printing step can be performed by a 3D laser printer.

[0112] In at least one embodiment of the invention, the sole and / or lug is formed by casting a material suitable for obtaining the sole and / or lug onto a mold, i.e., an elastic material, plastic, polymer, or rubber material, possibly including further components to further improve the features of the sole and / or lug, and then solidifying the material to obtain the sole and / or lug 1. In particular, by using a 3D printed model, it is possible to obtain features and / or elements (i.e., small grooves and / or protrusions on the sides and / or top base of the lug 1) on the sides, which gives the sole itself improved traction or grip.

[0113] Examples of the present invention

[0114] Below is an example illustrating the increase in surface area on the side of lug 1, taking into account several of its types:

[0115] Original sidewall area / lug = 274mm 2 ( Figure 1 );

[0116] Stepped sidewall area / lug = 455mm 2 ( Figure 2A );

[0117] Feature sidewall area / lug = 637mm 2 ( Figure 9A In this case, it is possible to obtain a 57% increase in sidewall area / lug, changing the pattern of its sidewall 4.

[0118] The spherical sidewall area / lug = approximately 63 mm 2 ;

[0119] The lateral wall area of ​​a triangle and / or pyramid or a flat section of a pyramid / lug = approximately 119 mm 2 .

[0120] Obviously, the above figures depend on the lug design, geometry, lug size, sidewall features, characteristic frequencies, and scale.

[0121] For example, the area of ​​a spherical sidewall refers to Figure 9A The surface area contributed by all hemispheres on one of the lugs. The lateral wall area of ​​a triangle refers to... Figure 9A Surface area measurement of all peak features or notches.

[0122] In this specification, the term "lug" refers to any protrusion on the sole of a boot used to improve traction or grip with the ground.

[0123] According to one embodiment of the invention, the total thickness of the sole and at least one lug 1 is 0.8 cm to 1.2 cm. The thickness of the sole can be 2 to 4 mm.

[0124] The lug 1 protrudes from the lower surface 20 of the sole at a height of 0.4 to 1.0 cm, especially 0.6 cm.

[0125] The total width of lug 1 can be between 1.2 and 2.0 cm, especially 1.4 or 1.5 cm.

[0126] The horizontal dimension of at least one step 4a can be 1.0 to 1.3 mm; the vertical dimension of at least one step 4a can be 1.0 to 2.0 mm.

[0127] The size of at least one protrusion 4b, i.e. the measurement of the degree of its protrusion, can be between 0.4 and 0.8 mm.

[0128] The size of at least one notch 4c, i.e., the measurement of the extent to which it penetrates inside the lug. It can be from 0.4 to 2.0 mm.

[0129] The difference between the first base 2 and the second base 3 of the lug 1 can be 1.0 to 2.0 mm on each side, especially 1.5 mm on each side.

[0130] Obviously, different sizes or dimensions are also possible without departing from the scope of this invention.

[0131] Thus, the sole and / or lugs according to the invention provide an effective solution to meet the requirements, namely, to produce a sole, or in particular an outsole, for footwear to meet the aforementioned requirements, while allowing for improved traction during foreseeable sporting activities such as walking, running, or others.

[0132] The invention described above can be modified and varied in many ways within the scope of the following claims.

Claims

1. A lug for the sole of footwear, including athletic shoes, work shoes, or boots, wherein the lug (1) comprises: A first base (2), a second base (3), and a sidewall (4), wherein the first base (2) contacts the ground during use, the second base (3) is adapted to be attached to the sole and / or opposite to the first base (2), and the sidewall (4) is laterally connected to the first base (2) and the second base (3). The sidewall (4) includes at least one step (4a), each of the at least one step (4a) having an outer surface defining a periphery formed by a vertical side and a horizontal side, the vertical side and the horizontal side being two sides of the periphery. The lug (1) includes an element having a three-dimensional structure at least at the sidewall (4) to impart traction and grip to the lug (1) on a ground or terrain composed of granular particles or a permeable surface. The element wherein said element increases the surface area of ​​the sidewall (4) and includes: At least one protrusion (4b) and at least one notch (4c), wherein each notch (4c) has a base located on the horizontal side of the step, the base extending vertically inside the step. The at least one protrusion includes a protrusion shape and a base, wherein the base is attached to the vertical side of the step (4a), and the protrusion shape is a hemispherical shape or a faceted hemispherical shape. The at least one protrusion (4b) and the at least one notch (4c) are arranged alternately on the vertical and horizontal sides of the same step, respectively.

2. A lug for the sole of footwear, including athletic shoes, work shoes, or boots, wherein the lug (1) comprises: A first base (2), a second base (3), and a sidewall (4), wherein the first base (2) contacts the ground during use, the second base (3) is adapted to be attached to the sole and / or opposite to the first base (2), and the sidewall (4) is laterally connected to the first base (2) and the second base (3). The sidewall (4) includes at least one step (4a), each of the at least one step (4a) having an outer surface defining a periphery formed by a vertical side and a horizontal side, the vertical side and the horizontal side being two sides of the periphery. The lug (1) includes an element having a three-dimensional structure at least at the sidewall (4) to impart traction and grip to the lug (1) on a ground or terrain composed of granular particles or a permeable surface. The element increases the surface area of ​​the sidewall (4) and includes at least one hemispherical protrusion and at least one pyramidal protrusion, wherein the hemispherical protrusion includes a hemispherical protrusion shape and a base, wherein the base is located on the vertical side of the step (4a), and the pyramidal protrusion is located on the horizontal side of the step (4a). The hemispherical protrusions and the pyramidal protrusions are alternately arranged on both sides of the periphery of the same step.

3. The lug according to claim 1 or 2, characterized in that, The element is present at the first base (2) of the lug (1) and increases the surface area of ​​the first base (2).

4. The lug according to claim 1 or 2, characterized in that, The lug (1) has a V-shape in the top plan view, and the first base (2) and the second base (3) have a V-shape in the top plan view, or the lug (1) has a prism, parallelepiped, cone cross section or pyramid cross section, L-shaped, C-shaped shape, and the first base (2) and the second base (3) have a polygonal, L-shaped, C-shaped, hemispherical, semi-elliptical or trapezoidal shape.

5. The lug according to claim 4, characterized in that, The first base (2) and the second base (3) have a parallelogram shape.

6. The lug according to claim 1 or 2, characterized in that, The first base (2) is smaller than the second base (3), and the sidewall (4) is inclined and / or narrows towards the common point of the ground during use, and / or the sidewall (4) includes a surface that is inclined towards the common point of the ground during use, and / or the first base (2) is parallel or not parallel to the second base (3).

7. The lug according to claim 1 or 2, characterized in that, The first base (2) and the second base (3) have the same dimensions, but are offset relative to each other, and the sidewall (4) is inclined toward the ground in the same direction during use, and / or the sidewall (4) includes a surface that is inclined toward the ground in the same direction during use.

8. The lug according to claim 1 or 2, characterized in that, The sidewall (4) includes at least two steps (4a), each of which has the same size and / or has a sharp or rounded edge and / or has a right-angled edge.

9. The lug according to claim 1 or 2, characterized in that, The at least one protrusion (4b) includes a protrusion shape and a base, wherein the base is attached to the sidewall (4) and / or the step (4a).

10. The sole of footwear, wherein the sole comprises: The upper surface (10) is adapted to face the user's feet during use; And a lower surface (20) adapted to face a resting surface or ground during use, characterized in that the lower surface (20) includes at least one and / or a plurality of lugs (1) as claimed in claim 1 or 2.

11. The sole according to claim 10, characterized in that, The lower surface (20) is directly attached to the second base (3) of the lug (1) and / or the plurality of lugs (1).

12. The sole according to claim 10 or 11, characterized in that, The sole has a thickness, wherein the thickness at the front portion of the sole is less than the thickness at the rear portion of the sole, and / or wherein the lug (1) has a height, wherein the height varies along the sole, and the height at the front portion of the sole is less than the height at the rear portion of the sole.

13. The sole according to claim 10 or 11, characterized in that, The lower surface (20) includes at least one protrusion (4b) and / or at least one notch (4c).

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