Flooring material

Abstract

To provide a flooring material capable of minimizing uplift while achieving a slim profile.SOLUTION: A flooring material 1 has: a first real portion 10 including a receiving recess 11 on an upper surface side and a protruding piece 13 on a lower surface side provided at one end 5 of both ends in a direction perpendicular to a thickness direction; and a second real portion 20 including a protruding piece 23 on the upper surface side and a receiving recess 21 on the lower surface side provided at another end 6. A tip surface of the protruding piece of the first real portion is formed as a locking inclined surface 15. A side wall surface of the receiving recess of the second real portion is formed as a locked inclined surface 22 that becomes outside as it extends from the upper surface side toward the lower surface 4. When the locked inclined surface is locked onto the locking inclined surface, a gap 9 is formed between the side wall surface 12 of the receiving recess of the first real portion of the adjacent flooring material and the tip surface 25 of the protruding piece of the second real portion. At least one of the side wall surface of the receiving recess of the first real portion and the tip surface of the protruding piece of the second real portion is an inclined surface that is inclined to cover at least a part of a bottom 9a of the gap.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to flooring. [Background technology]

[0002] Conventionally, flooring materials have been known that have a male part that protrudes from one end part of the board in the middle of the thickness direction and a female part that is recessed from the other end part of the board in the middle of the thickness direction, and are joined together in a so-called "heavy-strip structure." However, such flooring materials have had the problem of being difficult to make thinner. For example, Patent Document 1 below discloses a flooring material in which an inclined protrusion is provided at one end of a board material, the tip of which is inclined downward from the surface side of the board material and has a cross section formed in an approximately V shape, and an inclined groove is provided at the other end into which the inclined protrusion can be inserted. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-356979 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the flooring material described in Patent Document 1 is installed by pressing the inclined protrusions on the surface side into the inclined grooves of adjacent flooring materials, which raises concerns that they may be easily pushed up due to expansion caused by moisture absorption, thermal expansion, etc.

[0005] The present disclosure has been made in consideration of the above-described circumstances, and aims to provide a flooring material that is thin yet less likely to cause pushing-up. [Means for solving the problem]

[0006] In order to achieve the above object, the flooring material according to the present disclosure has a first solid portion including a receiving recess on the upper surface side and a protruding piece on the lower surface side at one end of both ends in at least one of a first direction and a second direction perpendicular to the thickness direction, and a second solid portion including a receiving recess on the lower surface side at the other end, the tip surface of the protruding piece of the first solid portion is an engaging inclined surface that becomes outward as it goes from the lower surface to the upper surface, and the side wall surface of the receiving recess of the second solid portion is an engaging inclined surface of the first solid portion of an adjacent flooring material. The engaging inclined surface is an engaging inclined surface that becomes outward as it goes from the top surface to the bottom surface so as to engage with the engaging inclined surface, and when the engaging inclined surface is engaged with the engaging inclined surface, a gap is formed between the side wall surface of the receiving recess of the first solid part of the adjacent flooring material and the tip surface of the protruding piece portion of the second solid part, and at least one of the side wall surface of the receiving recess of the first solid part and the tip surface of the protruding piece portion of the second solid part is an inclined surface that is inclined so as to cover at least a portion of the bottom of the gap when viewed in a plane. [Effects of the Invention]

[0007] The flooring material according to the present disclosure has the above-described configuration, which makes it possible to reduce the thickness while also making it less likely to cause pushing-up. [Brief explanation of the drawings]

[0008] [Figure 1] 1A is a schematic plan view showing an example of a flooring material according to an embodiment of the present disclosure; FIG. 1B is a schematic vertical cross-sectional view, partially broken away, corresponding to the view of the arrow XX line in FIG. 1A; and FIG. 1C is a schematic vertical cross-sectional view, partially broken away, showing the flooring material after installation. [Figure 2] 1(a) to 1(d) are schematic, partially cutaway, longitudinal cross-sectional views each showing a modified example of the flooring material, corresponding to FIG. 1(c). DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In some drawings, some of the detailed reference numerals used in other drawings are omitted. In the following embodiment, directions such as the up-down direction will be described based on the state in which an example of the flooring material according to this embodiment is installed.

[0010] 1 and 2 are diagrams schematically showing an example of a flooring material according to this embodiment and a modified example of the flooring material. As shown in Figures 1(a) to 1(c), the flooring material 1 according to this embodiment is configured such that a first solid portion 10 including an upper receiving recess 11 and a lower protruding piece 13 is provided at one end (5, 7) of both ends in at least one of a first direction and a second direction perpendicular to the thickness direction. The second solid portion 20 including an upper protruding piece 23 and a lower receiving recess 21 is provided at the other end (6, 8) of the flooring material 1. With this configuration, adjacent flooring materials 1, 1 can be installed by engaging the receiving recess 11 of the first solid portion 10 of one flooring material 1 with the protruding piece 23 of the second solid portion 20 of the other flooring material 1, and by engaging the protruding piece 13 of the first solid portion 10 of one flooring material 1 with the receiving recess 21 of the second solid portion 20 of the other flooring material 1. In other words, adjacent flooring materials 1, 1 can be joined by the interlocking first solid portion 10 and second solid portion 20. This allows for a thinner structure compared to a configuration in which the solid portion of this solid structure is provided.

[0011] The tip surface of the protruding piece 13 of the first solid part 10 is an engaging inclined surface 15 that slopes outward from the lower surface 4 to the upper surface 14. In other words, the engaging inclined surface 15 slopes diagonally downward. The side wall surface of the receiving recess 21 of the second solid part 20 is an engaged inclined surface 22 that slopes outward from the upper surface to the lower surface 4 so as to engage with the engaging inclined surface 15 of the first solid part 10 of the adjacent flooring material 1. In other words, the engaged inclined surface 22 slopes diagonally upward. With this configuration, by engaging the engaging inclined surface 15 of the protruding piece 13 of the first solid part 10 with the engaged inclined surface 22 of the receiving recess 21 of the second solid part 20 of the adjacent flooring material 1, it is possible to reduce rattling in the vertical direction between the ends of adjacent flooring materials 1, 1. With the inclined surface to be locked 22 locked to the locking inclined surface 15, a gap 9 is formed between the side wall surface 12 of the receiving recess 11 of the first solid portion 10 of the adjacent floor materials 1, 1 and the tip surface 25 of the protruding piece portion 23 of the second solid portion 20. With this configuration, even if expansion due to moisture absorption or thermal expansion occurs, the expansion can be absorbed by the gap 9 formed on the upper surface between the adjacent floor materials 1, 1, making it less likely that the floor materials will be pushed up.

[0012] At least one of the side wall surface 12 of the receiving recess 11 of the first solid portion 10 and the tip surface 25 of the protruding piece portion 23 of the second solid portion 20 is an inclined surface that is inclined so as to cover at least a part of the bottom portion 9a of the gap 9 in a plan view. With this configuration, it is possible to make it difficult for push-up to occur, while also making dust and the like that accumulates on the bottom side of the gap 9 less noticeable. 1(a) to 1(c), the side wall surface 12 of the receiving recess 11 of the first main portion 10 and the tip surface 25 of the protruding piece portion 23 of the second main portion 20 are inclined surfaces that are inclined in the same direction, and the entire bottom 9a of the gap 9 is covered. With this configuration, dust and other particles that accumulate on the bottom side of the gap 9 can be made less noticeable. Furthermore, the side wall surface 12 of the receiving recess 11 of the first solid part 10 and the tip surface 25 of the protruding piece 23 of the second solid part 20 are inclined surfaces that slope in the same direction as the locking inclined surface 15 and the locked inclined surface 22. With this configuration, even if the locking inclined surface 15 is not sufficiently locked to the locked inclined surface 22 on the lower surface side due to damage, a gap, etc., the tip surface 25 of the protruding piece 23 of the second solid part 20 can be locked by the side wall surface 12 of the receiving recess 11 of the first solid part 10 on the upper surface side, making it less likely that the ends of adjacent flooring materials 1, 1 will rattle in the vertical direction.

[0013] Specifically, as shown in FIG. 1(a), the flooring material 1 has a generally rectangular shape that is elongated in one direction in plan view. The length and width of this flooring material 1 may be approximately the same as those of general flooring materials. For example, the flooring material 1 may be a long plate-like body with a length of approximately 1500 mm to 2000 mm and a width of approximately 250 mm to 500 mm. Furthermore, if the flooring material 1 is configured to be laid on a floor, it may have dimensions smaller than those of the general flooring materials described above. For example, the flooring material 1 may have a length of approximately 600 mm to 1200 mm and a width of approximately 100 mm to 200 mm. The thickness of this flooring material 1 may be approximately 3 mm to 20 mm, which may be smaller than the thickness of general flooring materials, for example, 10 mm or less, or approximately 4 mm to 8 mm.

[0014] A plurality of flooring materials 1 may be arranged in a first direction and a second direction on a subfloor as a construction base to form a floor surface. The flooring material 1 may be fixed to the subfloor using fasteners such as screws or nails, adhesives, etc. In this case, the flooring material 1 may be fixed by fastening fasteners to the protruding piece portion 13 of the first main portion 10. Alternatively, the flooring material 1 may be installed on the subfloor in a so-called laid-on manner, without using fasteners, adhesives, etc. This flooring material 1 may be configured such that a decorative layer 3 is provided on the upper surface of a base material 2, as shown in FIG. 1(b). The substrate 2 may be made of a wood-based material such as a wood laminate such as plywood or LVL (laminated veneer lumber), a wood board such as particle board, or a wood fiberboard such as insulation board or MDF (medium-density fiberboard). In other words, the flooring material 1 may be a wood-based flooring material (wood flooring material) that includes a wood-based substrate 2. Alternatively, the substrate 2 may be made of a wood flour-plastic composite (WPC) in which a synthetic resin material contains wood flour, inorganic filler, compatibilizer, colorant, etc. in predetermined proportions, or may even be made of a synthetic resin material. The decorative layer 3 is in the form of a thin sheet whose thickness is extremely small compared to the overall thickness of the flooring material 1. This decorative layer 3 may be a decorative veneer such as sliced ​​slices of natural fine wood, a decorative sheet such as a synthetic resin sheet (film) or decorative paper, or a coating layer.

[0015] In this embodiment, as shown in FIG. 1(a), the flooring material 1 has four peripheral edges 5, 6, 7, and 8 each having a real portion 10, 20, 10, and 20, respectively. The first real portion 10 is provided at the first direction first edge 5, which is one of the two edges in the first direction (the width direction) of the flooring material 1, and the second real portion 20 is provided at the first direction second edge 6, which is the other edge. The first real portion 10 is provided at the second direction first edge 7, which is one of the two edges in the second direction (the length direction) of the flooring material 1, and the second real portion 20 is provided at the second direction second edge 8, which is the other edge. The first real portion 10 at the first direction first edge 5 and the second real portion 20 at the first direction second edge 6 are provided over the entire length of the flooring material 1 in the second direction. The first real portion 10 at the second direction first edge 7 and the second real portion 20 at the second direction second edge 8 are provided over the entire width of the flooring material 1 in the first direction. The first real part 10 of the first end portion 5 in the first direction and the first real part 10 of the first end portion 7 in the second direction have the same configuration. The second real part 20 of the second end portion 6 in the first direction and the second real part 20 of the second end portion 8 in the second direction have the same configuration. In the following, the first real part 10 and the second real part 20 will be described using the first real part 10 and the second real part 20 on both sides in the first direction as an example, but for the first real part 10 and the second real part 20 on both sides in the second direction, the first direction in the following description can be understood as the second direction.

[0016] 1(b), the receiving recess 11 of the first solid portion 10 is formed so as to cut out the upper surface side on one side in the thickness direction of the first end portion 5 of the flooring material 1, that is, in the shape of a recessed step from the upper surface side of the flooring material 1. The remaining lower surface portion on the other side in the thickness direction of the first end portion 5 of the flooring material 1 in the first direction, which is the receiving recess 11, becomes the protruding piece portion 13. The receiving recess 11 is formed to open outward and upward in the first direction, and is defined by a side wall surface 12 facing outward in the first direction and an upper surface 14 facing upward of the protruding piece 13. The side wall surface 12 of the receiving recess 11 is an inclined surface facing diagonally downward. The side wall surface 12 of the receiving recess 11 and the engaging inclined surface 15 of the protruding piece 13 are formed approximately parallel. The upper surface 14 of the protruding piece 13 is formed as an approximately horizontal plane approximately parallel to the upper surface and lower surface 4 of the flooring 1.

[0017] The thickness from the lower surface 4 of the flooring material 1 to the upper surface 14 of the protruding piece 13 (thickness of the protruding piece 13) may be appropriately set to a thickness that is appropriate for achieving a thin design and for preventing damage to the protruding piece 13, such as approximately 2 mm to 4 mm or approximately 2.5 mm to 3.5 mm. For example, if the thickness of the protruding piece 13 is set to 3 mm, the inclination angle of the locking inclined surface 15 relative to the upper surface 14 of the protruding piece 13 may be set to 40° to 80°. This configuration can prevent damage to the protruding piece 13 of the first solid portion 10 while achieving a thin design, and also reduces vertical wobble between the ends of adjacent flooring materials 1, 1. In other words, if the thickness and inclination angle of the protruding piece 13 are too small, the protruding piece 13 is more likely to be damaged, such as chipped. On the other hand, if the inclination angle is too large, the locking inclined surface 15 is less likely to adequately lock onto the locked inclined surface 22. In other words, if the inclination angle of the locking inclined surface 15 is made too large, the dimension along the first direction of the locking inclined surface 15 (the dimension obtained by dividing the thickness of the protruding piece portion 13 by the tangent of the inclination angle), which contributes to the locking (holding) of the locked inclined surface 22, tends to become smaller.

[0018] The inclination angle may be set so that the dimension of the locking inclined surface 15 along the first direction is 0.5 mm or more. The inclination angle may preferably be about 45° to 75°, more preferably about 50° to 70°, and in the illustrated example, it is about 60°. The inclination angle of the side wall surface 12 relative to the top surface of the flooring material 1 may also be set to an angle in the same range as the inclination angle of the locking inclined surface 15 relative to the top surface 14 of the protruding piece 13, from the viewpoint of preventing damage to the corner between the top surface of the flooring material 1 and the side wall surface 12. The example shown in the figure shows an example in which the inclination angle of the side wall surface 12 relative to the top surface of the flooring material 1 is approximately the same as the inclination angle of the locking inclined surface 15 relative to the top surface 14 of the protruding piece 13. In other words, the inclination angle of the side wall surface 12 relative to the top surface 14 of the protruding piece 13 and the inclination angle of the locking inclined surface 15 are approximately the same. The example shown in the figure also shows an example in which a chamfer is provided at the corner between the side wall surface 12 of the first solid portion 10 and the top surface of the flooring material 1. In this example, the thickness of the protruding piece 13 and the dimension along the thickness direction from the upper surface of the flooring 1 to the upper surface 14 of the protruding piece 13 (the step dimension of the receiving recess 11) are approximately the same. The "approximately the same dimension" for the thickness of the protruding piece 13 and the step dimension of the receiving recess 11 does not necessarily have to be completely the same dimension, but may also include a case where one dimension is approximately 0.9 to 1.1 times the other dimension.

[0019] The receiving recess 21 of the second solid portion 20 is formed so as to cut out the underside of the second end portion 6 in the first direction of the flooring material 1, that is, in the form of a recessed step extending from the underside of the flooring material 1. The portion of the upper surface of the second end portion 6 in the first direction of the flooring material 1 that remains after the receiving recess 21 becomes the protruding piece portion 23. The receiving recess 21 is formed to open outward and downward in the first direction, and is defined by an inclined engaging surface 22 facing outward in the first direction and a lower surface 24 facing downward of the protruding piece portion 23. The lower surface 24 of the protruding piece 23 is formed in a substantially horizontal plane that is substantially parallel to the upper surface and lower surface 4 of the floor material 1. The dimension along the thickness direction from the lower surface 4 of the floor material 1 to the lower surface 24 of the protruding piece 23 (the step dimension of the receiving recess 21) is substantially the same as the thickness of the protruding piece 13 of the first solid part 10. In other words, as shown in FIG. 1(c), when adjacent floor materials 1, 1 are joined together, the upper surface 14 of the protruding piece 13 of the first solid part 10 of one floor material 1 and the lower surface 24 of the protruding piece 23 of the second solid part 20 of the other floor material 1 substantially abut against each other.

[0020] The inclination angle of the engaging inclined surface 22 relative to the underside 4 of the flooring material 1 and the inclination angle of the tip surface 25 relative to the underside 24 of the protruding piece 23 may be set to an angle in the same range as the inclination angle of the engaging inclined surface 15 relative to the upper surface 14 of the protruding piece 13 described above, from the viewpoint of preventing damage, etc. In this example, the locked inclined surface 22 is formed approximately parallel to the locking inclined surface 15. In other words, the inclination angle of the locked inclined surface 22 relative to the lower surface 24 of the protruding piece 23 of the second solid part 20 is approximately the same as the inclination angle of the locked inclined surface 15 relative to the upper surface 14 of the protruding piece 13 of the first solid part 10. In other words, when adjacent flooring materials 1, 1 are joined together, the locked inclined surface 15 of the first solid part 10 of one flooring material 1 and the locked inclined surface 22 of the second solid part 20 of the other flooring material 1 abut over approximately their entire surfaces.

[0021] The tip surface 25 of the protruding piece 23 is an inclined surface facing diagonally upward. The tip surface 25 of this protruding piece 23 is formed approximately parallel to the side wall surface 12 of the receiving recess 11 of the first solid part 10. In other words, the inclination angle of the tip surface 25 of the protruding piece 23 of the second solid part 20 relative to the lower surface 24 and the inclination angle of the side wall surface 12 of the protruding piece 13 of the first solid part 10 relative to the upper surface 14 are approximately the same. In other words, when adjacent flooring materials 1, 1 are joined, a gap 9 of approximately uniform width is formed throughout the entire thickness direction between the side wall surface 12 of the receiving recess 11 of the first solid part 10 of one flooring material 1 and the tip surface 25 of the protruding piece 23 of the second solid part 20 of the other flooring material 1, except for the portion where the above-mentioned chamfered portion is formed. This gap 9 is defined on both sides in the width direction by the side wall surface 12 of the first solid portion 10 of one floor material 1 and the tip surface 25 of the second solid portion 20 of the other floor material 1, and the bottom 9a is defined by the upper surface 14 of the protruding piece portion 13 of the first solid portion 10 of one floor material 1. The width dimension (dimension along the first direction) of this gap 9 may be set to an appropriate dimension from the viewpoint of absorbing expansion due to moisture absorption, thermal expansion, etc., and from the viewpoint of reducing the discomfort felt when stepped on, and may be, for example, approximately 0.5 mm to 2 mm, or 1.5 mm or less.

[0022] The side wall surface 12 of the receiving recess 11 of the first solid portion 10 is formed so as to cover the bottom 9a of the gap 9 in a plan view. The side wall surface 12 is formed so that its dimension along the first direction (the dimension obtained by dividing the step dimension of the receiving recess 11 by the tangent of the inclination angle of the side wall surface 12) is larger than the width dimension of the gap 9. In addition, appropriate chamfers may also be provided at the corner between the upper surface 14 of the protruding piece 13 of the first solid part 10 and the engaging inclined surface 15, the corner between the upper surface of the flooring material 1 and the tip surface 25 of the protruding piece 23 of the second solid part 20, the corner between this tip surface 25 and the lower surface 24, and the corner between the engaging inclined surface 22 and the lower surface 4. In addition, in the above example, the first solid portion 10, 10 and the second solid portion 20, 20 are provided on both sides in the first direction and both sides in the second direction, respectively, but a configuration in which the first solid portion 10 and the second solid portion 20 are provided on both sides in only one of the first direction and the second direction may also be used. In this case, the side end faces of adjacent flooring materials 1, 1 in the other of the first direction and the second direction may be butted against each other when installed.

[0023] Next, modified examples of flooring materials will be described with reference to FIGS. 2(a) to 2(d). In the following modifications, differences from the previously described example will be mainly described, and the same components will be denoted by the same reference numerals and their description will be omitted or simplified. Also, the description of the same operational effects as those of the previously described example will be omitted or simplified.

[0024] FIG. 2(a) schematically shows a flooring material 1A according to a first modified example. In the flooring material 1A according to this modification, the angle of inclination of the locking inclined surface 15A relative to the upper surface 14 of the protruding piece 13A of the first solid portion 10A is different from the angle of inclination of the locked inclined surface 22A relative to the lower surface 24 of the protruding piece 23 of the second solid portion 20A. This configuration allows the locking inclined surface 15A and the locked inclined surface 22A to abut against each other and lock together, while also forming a space between them to accommodate adhesive, thereby reducing adhesive leakage to the upper surface. These inclination angles may be within the same range as the angle of inclination of the locking inclined surface 15 relative to the upper surface 14 of the protruding piece 13 in the above-described example.

[0025] In this modification, the angle of inclination of the locking inclined surface 15A of the first solid portion 10A is smaller than the angle of inclination of the locked inclined surface 22A of the second solid portion 20A. With this configuration, when adjacent flooring materials 1A, 1A are joined, an adhesive-receiving recess that opens downward is formed between the locking inclined surface 15A of one flooring material 1A and the locked inclined surface 22A of the other flooring material 1A, thereby effectively receiving the adhesive. Furthermore, the corner between the upper surface 14 of the protruding piece 13A of the first solid portion 10A and the locking inclined surface 15A can be effectively abutted against the upper end of the locked inclined surface 22A, which is the innermost part of the receiving recess 21A of the adjacent flooring material 1A, thereby more effectively preventing rattling in the vertical direction between the edges of the adjacent flooring materials 1A, 1A. The angle difference between the inclination angle of the locking inclined surface 15A of the first solid portion 10A and the inclination angle of the locked inclined surface 22A of the second solid portion 20A may be an appropriate angle difference from the viewpoint of preventing damage, etc., and from the viewpoint of ensuring an adhesive receiving recess, and may be approximately 5° to 15°.

[0026] FIG. 2(b) schematically shows a flooring material 1B according to a second modified example. In this modification, the angle of inclination of the locking inclined surface 15B relative to the upper surface of the protruding piece 13B of the first solid portion 10B is different from the angle of inclination of the locked inclined surface 22B relative to the lower surface 24 of the protruding piece 23 of the second solid portion 20B. In this modification, the angle of inclination of the locking inclined surface 15B of the first solid portion 10B is greater than the angle of inclination of the locked inclined surface 22B of the second solid portion 20B. With this configuration, the angle of inclination of the locking inclined surface 15B is relatively large, thereby preventing damage to the protruding piece 13B. In this modification, when adjacent flooring materials 1B, 1B are joined, an adhesive-receiving recess that becomes larger toward the innermost portion of the receiving recess 21B is formed between the locking inclined surface 15B of one flooring material 1B and the locked inclined surface 22B of the other flooring material 1B. The angle difference between the inclination angle of the locking inclined surface 15B of the first solid portion 10B and the inclination angle of the locked inclined surface 22B of the second solid portion 20B may be about 5° to 15°, as described above.

[0027] FIG. 2(c) schematically shows a flooring material 1C according to a third modified example. In this modification, the side wall surface 12A of the receiving recess 11A of the first solid portion 10C and the tip surface 25A of the protruding piece 23A of the second solid portion 20C are inclined surfaces that are inclined in a direction different from the locking inclined surface 15 and the locked inclined surface 22. That is, the side wall surface 12A of the receiving recess 11A of the first solid portion 10C is inclined surfaces that face diagonally upward, which is the opposite side from the above-described examples. Similarly, the tip surface 25A of the protruding piece 23A of the second solid portion 20C is inclined surfaces that face diagonally downward, which is the opposite side from the above-described examples. With this configuration, the corner between the lower surface 24 and the tip surface 25A of the protruding piece 23A of the second solid portion 20C is an obtuse angle, which can prevent damage to the relevant portion.

[0028] In this modification, the side wall surface 12A of the receiving recess 11A of the first solid portion 10C and the tip surface 25A of the protruding piece 23A of the second solid portion 20C are substantially parallel to each other. The angle formed between the lower surface 24 of the protruding piece 23A of the second solid portion 20C and the tip surface 25A may be an appropriate angle so as to cover the bottom 9a of the gap 9 and to prevent damage to the corner between the upper surface of the flooring material 1C and the tip surface 25A. The angle formed between the lower surface 24 of the protruding piece 23A of the second solid portion 20C and the tip surface 25A may be, for example, approximately 100° to 140°, and in the illustrated example, an angle of approximately 120° is shown. In this modified example, the tip surface 25A of the protruding piece portion 23A of the second solid portion 20C is configured to cover the bottom 9a of the gap 9. This tip surface 25A is formed so that the dimension along the first direction (the dimension obtained by dividing the thickness of the protruding piece portion 23A by the tangent of the inclination angle of the tip surface 25A with respect to the upper surface of the flooring material 1C) is larger than the width dimension of the gap 9.

[0029] FIG. 2(d) schematically shows a flooring material 1D according to a fourth modified example. In this modification, the side wall surface 12B of the receiving recess 11B of the first solid portion 10D and the tip surface 25A of the protruding piece 23A of the second solid portion 20C are formed so that the width of the gap 9A formed when adjacent flooring materials 1D, 1D are joined increases toward the bottom 9Aa. This configuration makes it possible to make the bottom side of the gap 9A less noticeable, while also increasing the accumulation space for dust and other particles at the bottom side of the gap 9A. In this case, at least one of the side wall surface 12B of the first solid portion 10D and the tip surface 25A of the second solid portion 20C may be formed as an inclined surface that slopes away from the other side toward the bottom 9Aa of the gap 9A. In this modification, the second real part 20C has the same configuration as that of the third modification, while the configuration of the first real part 10D is different from that of the above examples. In this modification, the side wall surface 12B of the receiving recess 11B of the first solid portion 10D is not an inclined surface as described above, but is an approximately vertical surface that is perpendicular to the upper and lower surfaces 4 of the flooring material 1D.

[0030] The different configurations of the flooring materials 1, 1A to 1D according to the above examples may be rearranged or combined as appropriate for application. The configuration of each part of the flooring materials 1, 1A to 1D according to this embodiment is merely an example, and various other modifications are possible.

[0031] <Additional Notes> The above description of the embodiments discloses the following techniques. <Technology 1> a first solid portion including a receiving recess on an upper surface side and a protruding piece on a lower surface side is provided at one end of both ends in at least one of a first direction and a second direction perpendicular to the thickness direction, and a second solid portion including a receiving recess on an upper surface side and a receiving recess on a lower surface side is provided at the other end, the tip surface of the protruding piece of the first solid portion is an engaging inclined surface which becomes outward as it goes from the lower surface to the upper surface, and the side wall surface of the receiving recess of the second solid portion is an engaging inclined surface which becomes outward as it goes from the upper surface to the lower surface so as to engage with the engaging inclined surface of the first solid portion of an adjacent flooring material, and when the engaging inclined surface is engaged with the engaging inclined surface, a gap is formed between the side wall surface of the receiving recess of the first solid portion of an adjacent flooring material and the tip surface of the protruding piece of the second solid portion, and at least one of the side wall surface of the receiving recess of the first solid portion and the tip surface of the protruding piece of the second solid portion is an inclined surface which slopes so as to cover at least a part of the bottom of the gap in a plan view. <Technology 2> The side wall surface of the receiving recess of the first solid part and the tip surface of the protruding piece of the second solid part are inclined surfaces that incline in the same direction, and the entire bottom of the gap is covered. <Technology 3> The flooring material according to Technology 2, wherein the side wall surface of the receiving recess of the first solid part and the tip surface of the protruding piece portion of the second solid part are inclined surfaces inclined in the same direction as the locking inclined surface and the locked inclined surface. <Technology 4> The flooring material according to any one of Techniques 1 to 3, wherein an inclination angle of the locking inclined surface relative to an upper surface of the protruding piece portion of the first solid part and an inclination angle of the locked inclined surface relative to a lower surface of the protruding piece portion of the second solid part are different angles. <Technology 5> The flooring material according to any one of Techniques 1 to 4, wherein the thickness from the lower surface of the flooring material to the upper surface of the protruding piece portion of the first solid part is 3 mm, and the inclination angle of the locking inclined surface relative to the upper surface of the protruding piece portion of the first solid part is 40° to 80°. [Explanation of symbols]

[0032] 1, 1A~1D Flooring 4 Bottom side 5 1st direction 1st end (one side end) 6. Second end in the first direction (other side end) 7. Second direction, first end (one side end) 8. Second direction, second end (other side end) 10,10A~10D Part 1 11,11A,11B Recessed 12, 12A, 12B Sidewalls 13, 13A, 13B Prominent parts 14 Above 15, 15A, 15B are anchored inclined surfaces. Part 20, 20A~20C 21,21A,21B Recessed 22, 22A, 22B are the inclined surfaces that are being secured. 23,23A Protruding part 24 below 25,25A tip face 9,9A gap 9a, 9Aa bottom

Claims

1. a first solid portion including a receiving recess on an upper surface side and a protruding piece on a lower surface side is provided at one end of both end portions in at least one of a first direction and a second direction orthogonal to the thickness direction, and a second solid portion including a receiving recess on an upper surface side and a protruding piece on a lower surface side is provided at the other end portion, a side wall surface of the receiving recess of the second solid part being an engaging inclined surface which becomes outward as it goes from the upper surface to the lower surface so as to be engaged with the engaging inclined surface of the first solid part of an adjacent flooring material, and when the engaging inclined surface is engaged with the engaging inclined surface, a gap is formed between the side wall surface of the receiving recess of the first solid part of an adjacent flooring material and the tip surface of the protruding piece of the second solid part, and at least one of the side wall surface of the receiving recess of the first solid part and the tip surface of the protruding piece of the second solid part is an inclined surface which is inclined so as to cover at least a part of the bottom of the gap in a plan view.

2. In claim 1, The side wall surface of the receiving recess of the first solid part and the tip surface of the protruding piece portion of the second solid part are inclined surfaces that slope in the same direction, and the entire bottom of the gap is covered.

3. In claim 2, A flooring material characterized in that the side wall surface of the receiving recess of the first solid part and the tip surface of the protruding piece portion of the second solid part are inclined surfaces that slope in the same direction as the engaging inclined surface and the engaged inclined surface.

4. In any one of claims 1 to 3, A flooring material characterized in that the inclination angle of the engaging inclined surface relative to the upper surface of the protruding piece portion of the first solid part and the inclination angle of the engaged inclined surface relative to the lower surface of the protruding piece portion of the second solid part are different angles.

5. In any one of claims 1 to 3, The flooring material is characterized in that the thickness from the underside of the flooring material to the upper surface of the protruding piece portion of the first solid part is 3 mm, and the inclination angle of the locking inclined surface relative to the upper surface of the protruding piece portion of the first solid part is 40° to 80°.

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