JP2012047036A - Building material panel with engaging means allowing for mutual coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building material panel with engaging means allowing for mutual coupling, fulfilling a necessity of further development of the building material panel, especially such as a possibility of improvement for mutual slide along the long side of the building material panel and a reduction of internal stress in a coupling region of the building material panel.SOLUTION: The inner wall of a tongue piece body 8 reaches up to a rounded slide surface 20 which is on the side of a concavity 10 and connects to an unrestricted surface of the tongue piece 8, on the one hand and reaches up to a concavity edge 42 which is positioned in a region which is at the lowest part of the concavity 10 and close to a bottom surface 12, on the other hand. The concavity 10 continuously rises up to a rounded step part 17 from the concavity edge as a starting point. A projection 26 is contained in the concavity 10 after a spring portion 24 is introduced into a groove 13. At that time, a play approximating to a zero value or a linear contact part is created between the projection 26 and a transfer portion 18 which transfers from an inner wall 21 to a slide surface.

Description

  The present invention relates to a plate-type rectangular building material panel. This building material panel has a decorative surface, a bottom surface located on the opposite side of the decorative surface, and a profile processing in parallel with each other (a general term for processing to make a surface shape such as surface irregularity processing into a specific geometric form). Two first side surfaces and two other second side surfaces profiled parallel to each other and positioned perpendicular to the side surfaces. All of the sides are bounded by the makeup and bottom surfaces.

  A floor panel as one type of building material panel mentioned at the beginning is known from the European patent publication 1585876B1 (patent document 1) of the present applicant. This floor panel produced by conventional technology has a proven track record in the market and is widely sold. In this known floor panel structure, smooth sliding becomes impossible when the dimensions change due to humidity in the vertical direction of the long side of the floor panel.

European Patent Publication 1585876B1 (Special Table 2006-512518)

  From the above situation, there is a need for improvement of building material panels, in particular, improved mutual sliding properties along the long sides of the building material panels, and reduction of internal stress in the bonding region of the building material panels.

The above problems are solved by the following plate-type rectangular building material panel according to the present invention. This building material panel of the present invention comprises a decorative surface, a bottom surface located on the opposite side of the decorative surface, two first side surfaces profiled in parallel with each other, and parallel to each other positioned perpendicular to the side surfaces. And the remaining two profiled second side surfaces, wherein all the side surfaces are bounded by the decorative surface and the bottom surface.
Furthermore, the building material panel of the present invention is provided with at least one pair of engaging means for releasably connecting to the same kind of building material panel, and the engaging means is formed on the side surface of the building material panel and has a complementary shape. However, in the assembled state, they cooperate with each other, and at this time, the engaging means provided on the side surface creates a groove / elastic coupling portion by fitting through a joint with the same kind of building material panel. The engagement means in the groove / elastic coupling portion includes a trapezoidal groove that tapers toward the groove bottom surface, and the groove includes a first groove wall extending substantially parallel to the decorative surface, and the first groove wall; A second groove wall having an inclination is provided on the opposite side, and the second groove wall is positioned lower than the groove and outside the meshing means via a rounded step. The concave portion protrudes from the groove, and the distal end is disposed on a leg portion that becomes a tongue piece body, and the tongue piece body is a flat inner wall and a free surface that is positioned parallel to the bottom surface. And is bounded by In the groove / elastic coupling portion, the engagement means includes a spring portion that is trapezoidal and engages with the groove, and the spring portion further has a semicircular protrusion directed to the bottom surface for engaging with the recess. The semi-circular protrusion is connected to one pocket that is bitten by the tongue piece body.
A particularly important feature of the invention is that the inner wall of the tongue piece is on the one hand up to a rounded sliding surface on the recess side and leading to the free surface of the tongue piece body, and on the other hand the lowest of the recess. Reaching the recess edge in the region located close to the bottom surface, the recess rising continuously from the recess edge to the rounded step, and the spring portion being the groove After being introduced into the projection, the projection is accommodated in the recess. At this time, a play or linear contact that approximates a zero value is formed between the projection and the transition portion from the inner wall to the slide surface. It is comprised so that a part may arise.

  In the following, the concept of “building material panel” includes “side wall panel” and “floor wall panel”, but the term “wall panel” also applies to wall or ceiling decorative panels and furniture wall panels. . Here, the floor panel refers to a plate-type structure characterized by a long side and a short side. The concept of “rounded slide surface” can refer not only to a cylindrical slide surface, but also to other geometric shapes, for example, parabolic or elliptical shapes.

  The floor panel according to the invention is made of wood, wood material, plastic or metal and can be solid, i.e. single-layer or multi-layer. In addition, the floor panel can be made of total wood, or a so-called HDF laminate, or MDF laminate (medium density fiberboard), or other wood materials. The wood materials listed at the end include a composite material of wood materials and plastics.

  The invention is particularly advantageous when it is wooden. Wooden floors generally have a long life and can withstand loads. An important feature of the wooden floor is the ability to absorb moisture and expel it back, resulting in swelling and shrinking. Wood materials offer many advantageous properties: air ionization, indoor microclimate control, protection against electrostatic charging and dust suction. The antiallergic action of wood materials is also known.

  The inner wall of the tongue piece body can be arranged perpendicularly or obliquely to the bottom surface. Preferably, however, an oblique arrangement of the inner walls is selected, with the inner walls forming an acute angle with a plane extending perpendicular to the bottom surface or an obtuse angle (complementary angle) with the bottom surface.

  The step portion of the recess located on the side opposite to the inner wall can be provided inside or outside the projection of the side groove with respect to the bottom surface.

  The slight play between the protrusions and the transition from the inner wall to the sliding surface basically occurs when the total wooden floor panel is a solid specification. The reason is that, when there is moisture, the wood fibers extending substantially in the longitudinal direction of the floor panel are subject to maximum swelling. This play has a value of 0.01 mm to 0.20 mm, preferably 0.12 mm to 0.15 mm, when the panel thickness is 14 mm.

  On the other hand, linear contact portions (not play) occur in the case of a multi-layer building material panel, in this example a three-layer building material panel. This is because the dimensional increase is not uniform in all three layers but is different. The sum of the dimensional increases when volume changes from humidity and temperature is smaller than the dimensional increase of the solid building panel. In this connection, reference is made to European patent EP 1585876B1 and German utility model DE203214445U1 filed by the applicant. The full scope of disclosure of these two patent publications is cited in the present invention.

  The wood fibers in the upper and lower layers (surface layer and bottom layer) extend substantially parallel to the long side of the floor panel, while the wood fibers in the middle layer (core layer) extend perpendicular to the long side. As a result, swelling of the upper and lower layers occurs perpendicular to the long side, but in the plate plane and occurs perpendicular to the plate plane.

  The swelling of the core layer occurs perpendicular to the long side, which is in a plane located perpendicular to the bottom surface and occurs parallel to the long side in the plate plane. The latter swelling direction has little influence on the dimensional change of the panel joint. Arranging the fibers of the core layer in the longitudinal direction with respect to the swelling direction of the surface layer and the bottom layer effectively prevents the swelling force of both layers.

  As the shape of the tongue piece cross section, a shape is selected such that the height of the tongue piece body measured from the bottom surface substantially corresponds to the height at which the transition portion from the step portion to the groove wall is located. .

  The recess may be flat and / or arcuate. Preferably, the concave portion is divided into two arc-shaped regions, and a region located near the inner wall has a radius equal to the radius of the slide surface. The other region of the recess has a radius that exceeds the radius value of the region close to the inner wall.

  It is particularly advantageous when the contact surface between the protrusion, the recess, or the transition point from the inner wall to the slide surface is limited to the linear contact portion. Thereby, the sliding property between floor panels is improved both during and after laying.

  It is an advantage of the present invention that at least the long sides of the new panel structure can avoid or significantly reduce the stresses that would normally occur and the dents that might occur in the butt surface area of the surface layer.

For the floor panels according to the invention, the following German and especially durable tropical timbers are considered:
-Sugar maple-American cherry (black cherry)
-Black walnut-Bright bamboo color-Birch-Pear tree-Bubinga-Beech-Cabryuba-Kumar-Ivory wood (Gatambu)
-Douche (Afzelia Superior)
-Oak-Alder-ash-Eucalyptus-European maple
-Japanese cherry tree-Rubber tree-Koganenozenkazura-Iroco-Jatoba-Kempas-Larch-Mahogany-Melbau-Muthenye-Niagon-Paduk-Palisader-Peroba-Yanimatsu-Red pine-Supiramu Baraka-Walnut-American Wenge (Panga Panga)

  Wood obtained from responsible and sustained forest management is displayed with FSC (Forest Stewardship-Countil) seals and is preferred for use in design.

The Brinell hardness of the above-mentioned wood types is 43 N / mm ² (Yamakaede) to 90 N / mm ² (Sukupila).

  Finally, the invention also relates to a flat coating comprising a bonded building material panel of the kind described above. The flat covering may be a floor, wall or ceiling decorative surface, a facade decorative surface, or a furniture wall surface.

It is the figure which looked at the plane side of the floor panel by this invention from the top. FIG. 2 is a cross-sectional view taken along line AA of FIG. FIG. 3 is an enlarged view of a side surface located in contact with the long side and having the groove shown in FIG. FIG. 3 is an enlarged view of a longitudinal side surface after joining two multi-layer floor panels, and an enlarged detail of a cross-sectional view thereof. FIG. 4 is an enlarged view showing a modified example of the side surface shown in FIG. 3, with the groove and the stepped portion moved rearward to the recessed portion, and an enlarged detail of the sectional view thereof. FIG. 4 is an enlarged view showing a modified example of the side surface shown in FIG. 3, with the groove and the stepped portion moved rearward to the recessed portion, and an enlarged detail of the sectional view thereof. FIG. 4 is an enlarged view showing a modified example of the side surface shown in FIG. 3, with the groove and the stepped portion moved rearward to the recessed portion, and an enlarged detail of the sectional view thereof. It is the enlarged view which expanded the detail of sectional drawing after joining two multi-layer type floor panels. It is sectional drawing cut | disconnected by line BB in FIG. It is an enlarged view before joining the short side area | region of two multi-layer type floor panels. It is the enlarged view which expanded the detail of the cross-sectional view before joining the short side area | region of two multi-layer type floor panels, and after joining. It is a perspective view in the joining process of the floor panel shown in FIG.

First, basic terminology concepts used in connection with the drawings will be described so that the embodiments described below may be better understood.
-“Decoating surface” is also called “tread surface” and corresponds to the upper surface of the floor panel or its surface layer that occurs after laying.
-“Bottom” corresponds to the lower side of the floor panel opposite the decorative surface.
“Butting surface” or “butting end” in the context of the present invention refers to two surfaces that lie perpendicular to the decorative surface or bottom surface and in contact with each other, in particular on the side surface, in particular the side surface of the surface layer.
-“Opposite panel” means a floor panel that cooperates with and has the same structure as other floor panels. In the case of the present invention, reference numerals 100 ', 200', and 300 'are assigned to the opposing panels.
-"Side" is the face of a floor panel that is divided into a decorative face and a bottom face and starts from the edges of these faces.

  Concepts such as “upper”, “upper”, “lower”, “lower”, “bottom”, “below”, “above”, “left”, “right” As shown in the drawings, the present invention relates to a floor panel laid on a horizontal base.

  An embodiment will be described. FIG. 1 is a schematic view of a decorative surface 11 of rectangular floor panels 100, 100 ′, 200, 200 ′ as viewed from above. The floor panels 100, 100 ', 200, 200' comprise two parallel side surfaces 1.1, 2.1 and two side surfaces 1.2, 2 perpendicular to these side surfaces 1.1, 2.1. .2. At that time, the side surfaces 1.1 and 2.1 are arranged on the long side of the floor panel, and the other side surfaces 1.2 and 2.2 are arranged on the short side.

  Details of the sides 1.1, 2.1, 1.2, 2.2 are not shown in FIG. 1 because it is a schematic diagram. These details are dealt with in the other figures of this specification. Accordingly, FIG. 1 includes two different embodiments of the floor panel. The differences between the embodiments relate only to the long side of the floor panel.

  The floor panels 100, 100 'are described in further detail in FIGS. Here, the side surfaces 1.1 and 1.2 provided on the long side are provided with meshing means 9 and 19, and these meshing means form the groove / elastic coupling portion 40 shown in FIG. 4.

  In FIG. 2, the floor panel 100, 100 ′ is composed of three layers: a lower bottom layer 7, an upper surface layer 5 with a decorative surface 11, and an intermediate core layer 3. FIG. 2 further schematically shows the arrangement of the swelling directions QR1, QR2, QR3, QR4.

  The wood fibers of the surface layer 5 and the bottom layer 7 extend parallel to the long side of the floor panel (not shown in FIG. 2). The swelling direction QR1 is indicated by an arrow perpendicular to the long side. The swelling direction QR2 is indicated by arrows oriented perpendicular to the decorative surface and the bottom surface.

  In the core layer 3, the wood fiber 23 extended perpendicularly | vertically to a long side is shown typically. QR3 indicates a swelling direction perpendicular to the long side and the bottom surface 12. The direction of swelling extending diagonally is indicated by the arrows shown diagonally. The swelling direction QR4 corresponds to the direction in which the long side extends, that is, the direction parallel to the plate surface, and is indicated by a point P in FIG.

  The side surface 2.1 starts from the decorative surface 11 and includes a butt surface 28.1, a groove 13, and a lower leg 4 protruding from the butt surface 28.1. The leg portion has a tongue piece body 8 pointing upwards as an end.

  The leg 4 is provided with a recess 10 which leads on the one hand to the inner wall 21 of the tongue piece 8 and on the other hand to a step 17 which is gently rounded. This step further transitions to a groove wall 25 that forms the lower slope of the groove 13. The free upper surface 44 of the tongue piece 8 is transferred to the inner wall 21 via the arc-shaped slide surface 20. The second groove wall 15 on the upper side of the groove 13 is positioned parallel to the decorative surface 11. That is, the groove 13 has a right trapezoidal shape, and therefore tapers toward the groove bottom surface 14.

  The meshing means 19 has a trapezoidal spring part 24 protruding beyond the abutting surface 28.2, which further follows a semicircular protrusion 26 pointing downward. In the joined state of FIG. 4, the protrusion 26 is arranged slightly above the recess 10 and forms a play 29 there. However, the protrusions 26 are supported by the transition 18 from the inner wall 21 to the slide surface 20, so that a linear contact portion 41, indicated by dots in FIG. 4, is produced.

  The abutting surface 28.1 (see FIG. 3) terminates in a chamfer 45 on the lower side of the surface layer 5 region. The chamfer 45 is connected to a rounding 46, which is further connected to the upper groove wall 15.

  FIG. 5 shows a side surface 2.1 of the floor panels 200, 200 ′, which differs from the first specification in FIG. The step 17 is placed in front of the plane E1, which is defined as the butt surface 28.1 extending downward. FIG. 5 further shows that the inner wall 21 is disposed obliquely on the bottom surface 12.

  In FIG. 6, the inner wall 21 is positioned at an acute angle β with the plane E2. This plane is determined by the transition portion 18 from the slide surface 20 to the inner wall 21 and the parallel arrangement of the plane E1 already described. The angle β is 1 ° to 45 °, preferably 16 ° to 20 °, particularly preferably an angle value of 18 ° with an angle error of ± 0.5 °.

  In FIG. 6, the height dimension H <b> 1 of the tongue piece body 8 substantially corresponds to the height H <b> 2 where the transition portion 31 from the stepped portion 17 to the groove wall 25 is disposed. FIG. 6 further shows a rounding 22 as a chamfer of the abutting surface 28.1, which chamfer leads to the upper groove wall 15.

  FIG. 7 shows the recess 10 divided into two arc-shaped regions L1 and L2. The region L1 has a radius R2, which corresponds to the radius R1 of the slide surface 20, but is smaller than the radius R3 of the larger region L2.

  The joined floor panels 200, 200 ′ are shown in FIG. 8a. The tongue piece 8 is housed in the pocket 27 of the opposing panel. At this time, the lower protrusion 26 of the spring part forms a play 29 between the recess 10 and the case of the specification of FIG. A linear contact portion 41 is formed in the transition portion 18 from the inner wall 21 to the slide surface 20. Further, in the lowermost region 43 of the recess, the recess edge 42 is recognized as one point. In particular, it is recognized that the recess 10 always rises up to the step portion 17 regardless of the arc-shaped regions L1 and L2 (see FIG. 7).

  FIG. 8 b shows the solid and solid floor panels 300, 300 ′ and the spring part 24 introduced into the groove 13. A one-dot broken line indicates an inclined position of the floor panel 300, and at this position, the spring portion 24 slides the lower chamfered edge 47 along the step portion 17 that is gently rounded. In this position, the lower projection 26 is still supported on the edge 48 formed by the upper surface 44 of the tongue piece 8 and the slide surface 20. When the spring portion 24 is pushed deeper into the groove 13, the round protrusion 26 also slides along the slide surface 20 and descends toward the recess 10, and finally the play 29 is generated. However, another play 30 also occurs between the projection 26 and the transition 18 from the slide surface 20 to the inner wall 21. The play 30 is suitably from 0.01 to 0.20 mm. When the panel thickness is 14 mm, the maximum value is suitably 0.14 mm.

  FIG. 9 is a cross-sectional view taken along the line BB of the floor panel 100, 100 ′ already described (also applies to the floor panels 200, 200 ′). The three-layer floor panel 100 (100 ') has another meshing means 6 (left side in the figure). This meshing means includes a trapezoidal head piece 48 disposed on the side surface 1.2 and a groove-shaped notch 49 adjacent to the head piece 48. This notch is bounded by the tongue piece 51.

  As shown in FIG. 10, the head piece 48 has a trapezoidal bottom surface 35 extending parallel to the bottom surface 12, and oblique side walls 36 and 56 connected to the trapezoidal bottom surface. The outer side wall 36 of the headpiece 48 is connected to the step 38.2 of the butt surface 64.2. The notch 49 has a flank 65 that faces in a direction perpendicular to the bottom surface 12, and this flank is located on the opposite side of the side wall 56 of the headpiece 48.

  Therefore, the notch 49 has a right trapezoidal shape, and the base 67 of the trapezoid is wider than the inner width 66 of the notch 49. In addition, the head piece 48 is chamfered on both sides of the lowermost region (not shown here) to facilitate insertion into the groove 34 of the opposing panel.

  The second side 2.2 (see the right side of FIG. 9) includes a meshing means 16 that matches the meshing means 6. The latter engagement means supports a lock mechanism arm 33 protruding beyond the floor panel abutment surface 64.1, and the end of this arm is a trapezoidal tongue piece 51 protruding upward.

  The opened groove 34 is milled into the lock mechanism arm 33. The groove 34 includes a groove bottom surface 39 disposed in parallel with the bottom surface 12 of the floor panel, and two groove walls 52.1 and 52.2 having inclinations. Due to this inclination, the groove 34 tapers upward. At that time, the stepped portion 38.1 of the abutting surface 64.1 is connected to the groove wall 52.1. The groove 34 is formed as a substantially isosceles trapezoid.

  Both steps 38.1, 38.2 extend parallel to the bottom surface 12 of the floor panel and are slightly offset from each other. This offset is caused when the height dimension of the butt surface 64.1 is slightly larger than the height dimension of the butt surface 64.2.

  In the joined state (see FIG. 11), a groove-elastic coupling portion 50 (dovetail coupling portion) is formed by fitting, and at this time, the groove walls 52.1, 52.2 connect the side walls 36, 56 of the headpiece 48. Squeeze. However, play 37 remains between the two step portions 38.1 and 38.2, and another play 60 remains between the trapezoid bottom surface 35 and the groove bottom surface 39. The size of the play 37 and the other play 60 approaches zero when the wood material swells.

  The role of both plays 37, 60 is to compensate for dimensional changes in the laid floor panels. The step portions 38.1 and 38.2 support the generated dovetail coupling portion 32 in a direction perpendicular to the decorative surface 11, and protect the butt surface from destructive pressure when dimensional changes occur in the wood material due to moisture. To do. The size of the play 37 and the play 60 is very small, and is 0.1 mm to 0.2 mm in the present invention.

  FIG. 12 shows the assembly of the short sides of the solid floor panels 300, 300 ′. When the floor panel 300 ′ is swung down around the swivel axis X, the head piece 48 is pushed into the groove 34 of the opposing panel, and finally a groove / elastic coupling portion 50 is formed by fitting (similar to FIG. 11). . The pivot axis X extends parallel to the long side of the floor panel and is determined by the cooperating parts of the floor panel, i.e. by the semicircular projection 26 on the lower side of the floor panel and the sliding surface 20 of the opposing panel. ing. The pivot axis X is not necessarily a straight line in terms of geometry, and can be regarded as a pivot axis region.

  It should be noted that reference numerals are used in the claims to make the comparison with the drawings convenient, but the present invention is not limited to the structure of the attached drawings by the entry.

100, 200, 300: Building material panel 1.1, 2.1: 1st side surface 1.2, 2.2: 2nd side surface 4: Leg part 8: Tongue piece body 9, 19: Engagement means 10: Concave part 11: decorative surface 12: bottom surface 13: groove 15: first groove wall 17: step portion 18: transition portion 20: slide surface 21: inner wall 24: spring portion 25: second groove wall 26: protrusion 27: pocket 30 : Play 40: Groove / elastic coupling part 41: Contact part 42: Concave edge 44: Free surface

Claims (16)

Plate-shaped rectangular building material panels (100, 200, 300), wherein the building material panels are
-A decorative face (11);
A bottom surface (12) located on the opposite side of the decorative surface (11);
-Two parallel profiled first sides (1.1, 2.1) and a parallel profiled rest located perpendicular to the sides (1.1, 2.1) Two second sides (1.2, 2.2), wherein all said sides (1.1, 2.1, 1.2, 2.2) are said decorative face (11) And the bottom surface (12),
The building panel further comprises at least one pair of interlocking means (9, 19) for releasably connecting to the same kind of building material panel, the interlocking means being arranged on the side surfaces (1.2, 2 and 2) of the building material panel; .2) and have a complementary shape, and cooperate in the assembled state,
-At that time, the engaging means (9, 19) provided on the side surfaces (1.1, 2.1) create a groove-elastic coupling part (40) by fitting through a joint with a building material panel of the same kind. ,
The engagement means (9) in the groove / elastic coupling part (40) comprises a trapezoidal groove (13) which tapers towards the groove bottom surface (14), said groove being substantially parallel to the decorative surface (11); A first groove wall (15) extending to the first groove wall and an inclined second groove wall (25) located opposite to the first groove wall, wherein the second groove wall (25) After passing through the rounded step (17), the groove (13) is located at a position lower than the groove (13) and is located outside the meshing means (9). ) Projecting from the distal end of the leg piece (4) which is the tongue piece body (8), the tongue piece body (8) is parallel to the flat inner wall (21) and the bottom face (12). Bounded by a free surface (44) located,
-In the groove / elastic coupling part, the meshing means (19) includes a spring part (24) which is trapezoidal and engages with the groove (13), and the spring part further engages with the recess (10). For connecting to a semicircular protrusion (26) directed to the bottom surface (12), said semicircular protrusion (26) being bitten by said tongue piece (8) in one pocket (27) Which leads to
The inner wall (21) of the tongue piece (8), on the one hand, is on the side of the recess (10) and has a rounded sliding surface (20) connected to the free surface (44) of the tongue piece (8); ), And on the other hand, reaches the recess edge (42) in the region (43) which is the lowest of the recess (10) and is located close to the bottom surface (12), and the recess (10) ) As a starting point and continuously rising to the rounded step (17), and after the spring (24) is introduced into the groove (13), the protrusion (26) The recess (10) is accommodated, and in that case, the gap between the protrusion (26) and the transition portion (18) from the inner wall (21) to the slide surface (20) approximates a zero value. Play (30) or linear contact portion (41) is formed. Building panel, characterized the door.   The building material panel according to claim 1, wherein the inner wall (21) is provided perpendicularly or obliquely to the bottom surface (12).   The step (17) is between the recess (10) and one flat surface (E1) positioned perpendicular to the decorative surface (11), and the flat surface is a butting surface (28. The building material panel according to claim 1, which is an extended surface of 1).   The inner wall (21) is arranged at an acute angle (β) with the plane (E2), and the plane passes through the transition portion (18) from the slide surface (20) to the inner wall (21), and the plane (E1). The building material panel according to any one of claims 1 to 3, wherein the building material panel is parallel to the surface.   The building material panel according to claim 4, wherein the angle (β) is 1 ° to 45 °.   The building material panel according to claim 1, wherein the play (30) has a value of 0.01 mm to 0.20 mm.   7. Building material panel according to claim 6, characterized in that the play (30) is at most 0.14 mm.   The building material panel according to claim 1, wherein the linear contact portion (41) is generated in the transition portion (18).   The height dimension (H1) of the tongue piece (8) corresponds to the height (H2) of the transition part (31) from the step part (17) to the groove wall (25). The building material panel according to claim 1.   The recess (10) is divided into two arc-shaped regions (L1, L2), and one of the regions (L1) has a radius (R2) equal to the radius (R1) of the slide surface (20). The building material panel according to claim 1.   The building material panel according to claim 10, characterized in that the region (L2) of the recess (10) has a radius (R3) greater than the radius (R2).   The building material panel according to any one of claims 1 to 11, wherein the building material panel is solid.   The building material panel according to any one of claims 1 to 12, wherein the building material panel is a multilayer body.   The building material panel according to any one of claims 1 to 13, wherein the building material panel is a wall panel, a ceiling panel, or a floor panel.   The building material panel according to any one of claims 1 to 13, wherein the building material panel is a furniture panel.   The flat covering body which consists of an assembly | attachment body of the building material panel in any one of Claims 1-13.

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