JP2017002714A - Mechanical locking system for floor panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a floor panel that is provided with a vertically locking system in a short edge.SOLUTION: A building panel has a locking system to be locked in the vertical direction by the vertical displacement to each other of a first building panel 1 and a second building panel 1'. In the edge of the first building panel, there is provided a tongue groove 20 opened laterally. A strip 6 is protruded outwardly ahead of the upper section of the edge of the first building panel under the tongue groove. A displaceable tongue 30 is provided in a displacement groove 40 opened laterally at the edge of the second building panel. The displaceable tongue comprises a main body extending along the edge of the second building panel, and a tongue locking surface 31 disposed in the upper part outer portion of the displaceable tongue. The tongue locking surface is formed so as to collaborate with a groove locking surface 21 of the tongue groove for locking the first and second building panels in the vertical direction.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates generally to the field of mechanical locking systems for floor panels and building panels. The present disclosure shows a floorboard, a locking system, an installation method, and a manufacturing method.

  The present invention is particularly suitable for use with a floating floor formed of floor panels. These floor panels are mechanically joined with a locking system that is integral with the floor panel, that is, installed in the factory. The floor panel comprises a veneer layer and one or more upper layers comprising a surface made of decorative laminated powder or a decorative plastic material, an intermediate core made of wood fiber material or plastic material, preferably after the core. And a lower balancing layer provided on the side.

  Accordingly, the well-known techniques, known system problems, and objects and features of the present invention, which are described below as non-limiting examples, relate specifically to this field of application, and in particular, include long and short edges. The present invention relates to a panel formed as a rectangular floor panel that is mechanically joined to each other.

  The terms long edge and short edge are used primarily to simplify the description of the present invention. The panel may be square. The present invention is preferably used with short edges. It should be emphasized that the present invention may be used with any floor panel and may be combined with all known locking systems formed on the long edges. The floor panels are adapted to be joined using a mechanical locking system that connects at least two adjacent sides of the panels in the horizontal and vertical directions.

  Furthermore, the present invention is, for example, a solid wood floor, a parquet floor having a surface made of wood or wood fiber material core and wood or wood veneer, etc., printed, preferably further varnished. It can also be applied to floors with surfaces, floors with plastic, cork, linoleum, or rubber surface layers. Includes floors with hard surfaces such as stone and tiles, and flooring with a soft wear layer, eg, needle felt bonded to the board. The present invention can also be used to join building panels containing board materials such as wall panels, ceilings, furniture parts and the like.

  The laminate flooring is usually a core formed of a fiber board having a thickness of 6 mm to 12 mm, an upper decorative surface layer formed of a laminate of 0.2 mm to 0.8 mm, a laminate, And a lower balancing layer having a thickness of 0.1 mm to 0.6 mm formed of plastic or paper. The surface of the laminate is formed of paper impregnated with melamine resin. The most common core material is a fiber board with high density and excellent stability. This is usually called HDF (High Density Fiber Board). In some cases, MDF (medium density fiber board) is also used.

  This type of conventional laminate floor panel has been joined by tongue and groove using an adhesive. In addition to such conventional floors, floor panels have been developed that do not require the use of joints and are instead mechanically joined by so-called mechanical locking systems. These systems have locking means for locking the panel in the horizontal and vertical directions. The mechanical locking system is usually formed by machining the core of the panel. In another aspect, the components of the locking system are formed of a separate material, for example made of aluminum or HDF, integrated with the floor panel, ie joined to the floor panel in connection with the manufacture of the floor panel. Also good.

  The main advantage of a floating floor with a mechanical locking system is that it is easy to install. These systems are also easy to remove and reuse elsewhere.

Definition of Some Terms In the following description, the visible surface of the installed floor panel is referred to as the “front side”, while the opposite side of the floor panel facing the underfloor is referred to as the “rear side”. The edge between the front side and the rear side is called the “joining edge”. The term “horizontal plane” means a plane extending parallel to the outer portion of the surface layer. The closely adjacent upper portions of the two adjacent joint edges of the two joined floor panels form a “vertical plane” that is perpendicular to the horizontal plane. “Vertical locking” means locking parallel to the vertical plane in the D1 direction. “Horizontal locking” means locking parallel to the horizontal plane in the D2 direction.

  The term “upward” means toward the front side (front side), the term “downward” means toward the rear side (back side), and the term “inward” The term “outward” mainly means the direction away from the central portion of the panel in the horizontal plane.

  The term “locking system” means a cooperating connecting element that connects the floor panels vertically and / or horizontally.

  Several methods can be used to mechanically join the long and short edges in the vertical direction and in a first horizontal direction perpendicular to the edges. One of the most commonly used methods is the angle-snap method. Install the long edge by tilting. The panel is then displaced along the long side at the locking position. The short edge is locked by the horizontal snap method. The vertical connection is made with a tongue and groove. During horizontal displacement, when the strip with the locking element bends and the edges touch, the strip returns by spring action and the locking element enters the locking groove to lock the panel in the horizontal direction. Such snap connections are complex because they require the use of a hammer and tapping block to overcome the friction between the long edges and bend the strip during the snap-fit action.

  Furthermore, a similar locking system with a rigid strip may be formed. These locking systems are connected in an angling-angling method that tilts both the short and long edges into the locking position.

  Recently, there has been a new and very efficient locking system that is provided with a separate flexible or displaceable tongue on the short edge and can only be installed with a tilting action commonly referred to as “vertical stacking” Has been introduced. Such a system is described in WO 2006/043893 (Balling Innovation AB).

  In the market, several aspects shown in FIGS. 1a to 1f are used. 1a and 1b show a flexible tongue 30 from which flexible snap tabs extend from the edge. Figures 1c and 1d show a displaceable tongue with a flexible inner part that can be bent horizontally in the cross section of the tongue or along the joint. These systems are called vertical snap systems and automatically lock during the lap action.

The locking system is further locked by a side pushing action so that the displaceable tongue 30 is pushed into the locking position from the long side edge when the adjacent short side edge is superimposed on the subfloor. Also good.
Such side pushing action is difficult to combine with simple tilting and is too strong for wide panels.

  FIG. 1e shows a stacking system with a flexible tongue 30 formed in one piece with the core. FIG. 1f shows the long edge locking system of the lap system connected by tilting.

  Such a system is very efficient, but there is room for improvement. The vertical snap system is designed such that the strip panel is provided with a tongue. This is because when the upper edge portion is formed without a chamfered portion as in a general case, an inclined sliding surface only needs to be formed on the overlapping panel. During manufacture, it is difficult to insert a separate tongue 30 in the groove 40 of the strip 6 with the locking element 8. The locking force is determined by the snap resistance. When the locking force is high, the snap resistance when the tongue is pressed inward and when the tongue returns into the tongue groove 40 is high. Therefore, a separation force that acts to push and release the panels during the stacking is generated. When the tongue's flexibility and pushing force decrease over time, the locking strength is lost. It must be quite flexible and the flexible tongue must be able to be displaced by about 1 mm to 2 mm in two directions. The materials used to make such tongues are relatively expensive, and generally glass fibers are used to strengthen the flexible tongue.

  The main advantage is to secure a separate tongue to the overlap panel and to eliminate the snap fit with a system that automatically locks during overlap.

  The purpose of the embodiments of the present invention is to provide a short edge locking resistance and separation force during stacking for a primarily rectangular floor panel with long and short edges, installed in parallel rows. It is an object of the present invention to provide a locking system that can automatically lock the short edges to each other without the snap action of generating the. A specific purpose is to provide a separate displaceable tongue on the overlap panel that locks without contact with the sharp top edge of the strip panel and displaces only outward in one direction essentially from the inner part of the groove. Providing a locking system.

WO2006 / 043893

  The above object of the invention is achieved in whole or in part by a locking system and a floor panel according to the independent claims. Embodiments of the invention will become apparent from the dependent claims and from the following description and the accompanying drawings.

  A first aspect of the present invention is a building panel having a locking system for locking the first building panel and the second building panel in the vertical direction by vertical displacement of these panels with respect to each other. is there. The edge of the first panel for building is provided with a tongue groove opened to the side. A strip projects outwardly under the tongue groove and beyond the upper part of the edge of the first building panel. Displaceable tongues are provided in the displacement grooves opened to the sides of the edge of the second building panel. The displaceable tongue includes a main body extending along the edge of the second panel and a tongue locking surface disposed on the upper outer portion of the displaceable tongue, the tongue locking surface comprising: In order to lock the second building panel in the vertical direction, it is formed to cooperate with the groove locking surface of the tongue groove. The displaceable tongue includes an inner portion spaced inwardly from an upper portion of the edge of the second panel, the inner portion being configured to cooperate with the strip press surface of the strip. including. When the tongue press surface and the strip press surface are displaced in the direction perpendicular to each other, the displaceable tongue is displaced in the tongue groove and is locked in the vertical direction.

  The displaceable tongue is preferably a tongue formed by injection molding.

  The displaceable tongue may be asymmetric and include a protrusion, and the second panel may include a cavity for receiving the protrusion.

  The protrusion may include a flexible portion.

  In order to lock the first and second building panels in the horizontal direction, the strip may be provided with a locking element that cooperates with a locking groove opened downward in the second panel. .

  The tongue press surface is preferably positioned on the protrusion and the strip press surface is preferably arranged on the locking element.

  The strip press surface is most preferably arranged on the inclined surface of the locking element directed towards the edge of the first building panel.

  The locking system may include a cavity that extends from the displacement groove to the locking groove.

  The strip press surface and the tongue press surface may be inclined at an angle of about 25 ° to 75 ° with respect to the horizontal plane.

  The displacement groove may be inclined and includes an inner portion extending downward.

  The building panel may be locked vertically by cooperating surface pairs including a tongue locking surface and a groove locking surface and includes an upper portion of the strip and a lower portion of the edge of the second panel.

  The groove locking surface and the tongue locking surface may be inclined with respect to the horizontal plane.

  The groove locking surface and the tongue locking surface may be inclined at an angle of about 10 ° to 60 °.

  The displaceable tongue may be provided with a flexible friction element.

  The displaceable tongue includes at least two protrusions extending from the main tongue body, each protrusion having the tongue press surface disposed on the outer portion of the protrusion, and each tongue press surface is a locking In contact with the locking elements provided in the strip.

  The building panel may be a floor panel. The upper-outer part of the displaceable tongue is arranged in the displacement groove in the unlocked position.

  The displacement groove extends above the locking groove.

  The locking groove may be disposed below the upper portion of the displacement groove.

  The upper part of the locking element may be arranged below the tongue locking surface of the displaceable tongue.

  The upper portion of the locking groove may be disposed below the tongue locking surface of the displaceable tongue.

  The innermost part of the displaceable tongue may be arranged below the outermost part of such a tongue.

  The tongue press surface may be disposed below the tongue locking surface.

  The upper part of the locking element may be arranged in the lower half of the intermediate core of the first building panel.

  The strip may be flexible so that it bends downward during locking.

  The cavity may be larger than the protrusion so that there is a space S of at least about 1 mm to 3 mm.

  A displaceable tongue may be gradually inserted into the tongue groove from a tongue portion adjacent to the installed long edge to another tongue portion adjacent to the free long edge.

  In the following description, the present disclosure will be described in more detail with reference to the accompanying drawings in connection with exemplary embodiments.

1a to 1f show a locking system according to the prior art. Figures 2a to 2d are views of a short edge locking system according to one embodiment of the present invention. 3a to 3d are views of a short edge locking system according to a preferred embodiment of the present invention. Figures 4a to 4e show a preferred embodiment of the short edge locking system. Figures 5a to 5e are diagrams illustrating vertical stacking of three panels according to one embodiment of the present invention. Figures 6a to 6e show a preferred embodiment of the locking system's flexibility and displaceable tongue during locking. Figures 7a to 7c show a tongue blank according to an embodiment of the invention comprising several tangs that can be displaced.

  For ease of understanding, several locking systems are shown schematically in the accompanying drawings. It should be emphasized that improved functions or various functions can be obtained by using a combination of preferred embodiments.

  All examples may be used separately or in combination. Angles, dimensions, rounded portions, and spacing between surfaces are merely examples and may be adjusted within the basic principles of the present invention.

  Figures 2a to 2d show a first preferred embodiment of a short edge locking system in which a flexible and displaceable tongue 30 is provided at the edge of the second panel 1 '. The displaceable tongue 30 is inserted in the displacement groove 40 and extends along the edge of the second panel. The displaceable tongue 30 has a tongue locking surface 31 disposed in the upper outer portion. The tongue locking surface 31 cooperates with the groove locking surface 21 disposed in the upper inner portion of the tongue groove 20 formed in the adjacent edge portion of the first panel 1. These locking surfaces lock the panel in the first vertical direction. These locking surfaces are preferably inclined at an angle A2 of about 10 ° to 60 °. Preferably, the displacement groove is also inclined, and the outer portion of the displacement groove is closer to the panel surface than the inner portion of the displacement groove.

  The first panel 1 includes a protruding strip 6 that extends outward beyond the vertical plane VP. This strip includes a locking element 8. The second panel 1 ′ is provided with a locking groove 14 for locking the panels in the horizontal direction in cooperation with the locking element 8. The upper part 6 'of the strip 6 contacts the lower part 37 of the adjacent edge and locks the panel in the second vertical direction.

The displaceable tongue 30 includes a protrusion 34 that extends from the main tongue body 36. The second panel 1 ′ is provided with at least one cavity 35 for accommodating the protruding portion.
The cavity 35 extends from the displacement groove to the locking groove 14. The cavity may be formed by threading or by a displaceable saw blade. The protrusion 34 includes a tongue press surface 32 that cooperates with a strip press surface 33 provided on the locking element 8. The strip press surface 33 and the tongue press surface 32 are inclined at an angle A1 of preferably 25 ° to 75 ° with respect to the horizontal plane HP.

  The displaceable tongue is displaced essentially in one direction toward the tongue groove 20 as the inclined press surfaces slide together during vertical displacement of adjacent edges. The tongue is locked against the groove locking surface 21 with a strong pressure, and the locking element 8 prevents the tongue from sliding into the displacement groove 40.

  One major problem with the "press locking system" described above is that there is a risk that the panel will crack and a crack 50 will be formed between the displacement groove 40 and the locking groove 14, as shown in FIG. 2d. That's what it means. Therefore, the locking groove 14a and the upper part 8a of the locking element are formed in the lower part of the floor panel, preferably below the center line C dividing the floor panel into two equal parts, the upper part UP and the lower part LP. It is preferable to do this. Furthermore, it is preferable to dispose the tongue press surface 32 and the tongue locking surface 31 vertically below. The tongue pressing surface 32 and the tongue locking surface 31 are preferably offset in the vertical direction, and are preferably arranged in different horizontal planes H2, H2. Further, the upper portion 8 a of the locking element and / or the upper portion 14 a of the locking groove are arranged below the tongue locking surface 31 in the vertical direction. The innermost part of the displaceable tongue 30 is preferably arranged below the outermost part of such a tongue.

  The cavity 35 is preferably formed by a rotating saw blade and preferably includes a rounded upper portion with an outer portion 35b disposed above the inner portion 35a, as shown in FIG. 2d. The cavity is preferably formed so as to intersect the inner portion 14 b of the locking groove 14.

  FIGS. 3 a to 3 d show the locking function during the vertical displacement of the second panel 1 ′ with respect to the first panel 1. Due to the cooperation of the press surfaces 32, 33, the displaceable tongue 30 is gradually pushed into the tongue groove 20, and the two pairs of cooperating locking surfaces, namely the tongue locking surface 31 and the groove locking surface 21, and the strip 6. These panels are locked in the vertical direction by the upper part 6 'and the lower part 37 of the adjacent panel 1'.

  Figures 4a to 4e show different embodiments. FIG. 4a shows a displaceable tongue 30 with a protrusion 34 located below the main tongue body. The locking groove 14 is disposed vertically below the upper portion of the displacement groove 40. FIG. 4 b shows a tongue press surface 32 that locks against the strip press surface 33. This does not act as a horizontal lock. FIG. 4 c shows an embodiment in which the same locking surface 33 of the locking element 8 is used as a pressing surface and as a locking surface for horizontal locking. FIG. 4 d shows an embodiment in which the strip press surface is formed on another push rod 42. FIG. 4 e shows a protrusion 34 with a curved cross section and a locking element in which the upper part 44 is formed as a local protrusion protruding into the cavity 35 above the inner part of the locking groove 14.

  Figures 5a and 5e show a vertical overlap of three panels, where the long edges 2, 2 'are connected with a tilt and the short edges 1, 1' combine tilt and vertical displacement. It is connected by the operation like a kite. FIG. 5 b shows a state in which the displaceable tongue is gradually inserted into the tongue groove 20 from a part of the edge adjacent to the installed long edge 2 to the other free long edge. 5c shows the tongue at section AA, and FIGS. 5d and 5e show the position of the tongue at sections BB and CC. The strip 6 and the locking element 8 are designed in this embodiment to bend backwards during locking, thereby facilitating locking. This is because such bending of the strip provides some or all of the necessary flexibility. The locking groove is positioned vertically below the lower portion of the displacement groove 40.

  FIG. 6a shows that the locking system may be formed so that several parts, for example the protrusion 34, the locking strip 6, and the locking element 8, are flexible. This flexibility may be used to reduce or eliminate manufacturing tolerances and to provide an easy and strong lock. FIG. 6a shows that the strip 6 may be bent downward and the locking element 8 may be bent downward and outward. Such bending of the strip facilitates locking, and locking can be performed even with a tongue having a limited flexibility such as a tongue made of wood fiber material. A part of the displaceable tongue 30 is also locked with a certain degree of flexibility when the edge is bent only about 0.1 mm to 1.0 mm horizontally, ie not compressed.

  Figures 6b and 6c show different embodiments of tongues. The displaceable tongue 30 may be fixed in the displaceable groove by a friction coupling 38. The protrusion 34 may include a flexible portion 39 that generates a pretension against the tongue groove 20. The cavity 35 may be much larger than the protrusion, and preferably has a space S of about 1 mm to 3 mm.

  FIG. 6d shows a locking system in which the sliding surface 45 protrudes beyond the vertical plane VP. The tongue groove 20 is preferably formed in an inclined edge surface 46. Such an embodiment provides the advantage that the displaceable tongue 30 is pressed inward and the conventional two-way snap action is combined with the one-way pressing action used to provide the final lock. To do.

  FIG. 6e shows a separate tongue 30 placed in a groove 40 open to the side of the second panel 1 '. The tongue includes an upwardly extending snap tab 47, which cooperates with a downwardly extending sliding surface 45 disposed on the first panel 1. The sliding surface 45 protrudes beyond the upper edge and the vertical plane VP. The second panel 1 ′ preferably includes an inclined edge surface 46 ′ disposed above and / or below the tongue 30. Even if the adjacent upper edge is straight and the panel is sharp, it can be easily snapped. Instead of a snap tab, a displaceable tongue provided with a flexible snap projection along its length may be used. The locking system shown in FIG. 1d may be adjusted to have a beveled edge surface and such a design may be used to improve the strength of the joint.

  The locking system according to the invention may also be formed without the locking groove 14 and the locking element 8 so that only the edges are locked in the vertical direction. Instead of the locking element 8, local protrusions extending upward from the strip 6 may be used. These protrusions are disposed in the cavities in the locked position. The short edge may be locked in the horizontal direction by friction between the long edges.

  All locking systems may be designed so that they can be unlocked by tilting and / or sliding along the edge.

  Figures 7a and 7b show a tongue blank 43 comprising several displaceable tongues. These tongues are preferably asymmetric along the tongue length. FIG. 7a shows a tongue 30 formed by injection molding and FIG. 7b shows a displaceable tongue 30 made of wood fiber material, preferably formed by machining and stamping.

  The cavity 35, preferably formed of a rotary saw blade, has a rounded upper portion and may include an inner portion disposed below the outer portion. The locking system may be formed in part or in whole by a carving tool.

1 '1st panel 6 protruding strip 6' upper part 8 locking element 14 locking groove 20 tongue groove 21 groove locking surface 30 displaceable tongue 31 tongue locking surface 32 tongue press surface 33 strip press surface 34 protrusion 35 Cavity 36 Main tongue main body 37 Lower part 40 Displacement groove 50 Crack

Claims (28)

With a locking system for locking the first building panel (1) and the second building panel (1 ′) vertically by the vertical displacement of these panels (1, 1 ′) relative to each other. A building panel,
An edge of the building first panel (1) is provided with a tongue groove (20) that is open to the side, and a strip (6) is disposed under the tongue groove (20) in the first panel for building ( 1) protruding outward beyond the upper part of the edge,
The displacement groove (40) opened to the side of the edge of the second panel for building is provided with a displaceable tongue (30), and the displaceable tongue (30) is formed on the second panel. A main body extending along an edge, and a tongue locking surface (31) disposed on an upper outer portion of the tongue, the tongue locking surface being a groove locking surface of the tongue groove (20) (21) In the building panel, which is formed so as to cooperate in the vertical direction to lock,
The displaceable tongue includes an inner portion (34) spaced inwardly from an upper portion of the edge of the second panel (1 ′);
The inner portion includes a tongue press surface (32) formed to cooperate with a strip press surface (33) of the strip (6), the tongue press surface and the strip press surface (32, 33) When displaced vertically relative to each other, the displaceable tongue (30) displaces in the tongue groove and locks the first and second building panels (1, 1 ') in the vertical direction. , Building panels. The building panel according to claim 1,
The building panel wherein the displaceable tongue (30) is asymmetric and includes a protrusion (34), and the second panel (1 ') includes a cavity (35) for receiving the protrusion. The building panel according to claim 2,
The protrusion (34) is a building panel including a flexible portion (38). In the building panel according to claim 2 or 3,
The building panel is larger than the protrusion (34) so that the cavity (35) has a space S of at least about 1 mm to 3 mm. In the building panel as described in any one of Claims 2 thru | or 4,
The strip (6) has a locking groove (14) opened downward in the second panel so as to lock the first and second building panels (1, 1 ') in the horizontal direction. A building panel comprising a locking element (8) formed to cooperate with the device. The building panel according to claim 5,
The building panel, wherein the tongue press surface (32) is provided on the protrusion (34) and the strip press surface (33) is provided on the locking element (8). The building panel according to claim 6,
The strip press surface (33) is a building panel provided on an inclined surface of the locking element (8) directed towards the first edge. The building panel according to claim 5,
The strip press surface (33) is a building panel provided in the upper part of the locking element (8). In the building panel as described in any one of Claims 5 thru | or 8,
The cavity (35) is a building panel extending from the displacement groove (40) to the locking groove (14). In the building panel as described in any one of Claims 5 thru | or 9,
The said displacement groove (40) is a panel for buildings extended above the said locking groove (14). In the building panel as described in any one of Claims 5 thru | or 10,
The building panel, wherein the upper part (8a) of the locking element (8) is arranged below the tongue locking surface (31) of the displaceable tongue (30). In the building panel as described in any one of Claims 5 thru | or 11,
The building panel, wherein the upper portion (14a) of the locking groove (14) is disposed vertically below the tongue locking surface (31) of the displaceable tongue (30). In the building panel as described in any one of Claims 5 thru | or 12,
The uppermost part of the said locking element is a building panel arrange | positioned in the lower half part of the intermediate core of the said 1st building panel. In the building panel as described in any one of Claims 1 thru | or 13,
The building press panel, wherein the tongue press surface and the strip press surface (32, 33) are inclined at an angle (A1) of about 25 ° to 75 ° with respect to a horizontal plane (HP). In the building panel as described in any one of Claims 1 thru | or 14,
The said displacement groove | channel (40) is a panel for buildings containing the inner part which inclines and extends below. In the building panel as described in any one of Claims 1 thru | or 15,
The first and second building panels (1, 1 ') are vertically locked by a first pair of cooperating locking surfaces and a second pair of cooperating locking surfaces, the first A pair of cooperating locking surfaces includes the tongue locking surface (31) and the groove locking surface (21), and the second pair of cooperating locking surfaces is the upper portion (6 of the strip). ') And a lower panel (37) of the edge of said second panel (1'). In the building panel as described in any one of Claims 1 thru | or 16,
The building panel, wherein the groove locking surface (21) and the tongue locking surface (31) are inclined with respect to a horizontal plane. In the building panel as described in any one of Claims 1 thru | or 17,
The building panel, wherein the groove locking surface (21) and the tongue locking surface (31) are inclined at an angle (A2) of about 10 ° to 60 °. In the building panel as described in any one of Claims 1 thru | or 18,
The displaceable tongue (30) is a building panel comprising a flexible friction element (38). In the building panel as described in any one of Claims 1 thru | or 19,
The displaceable tongue (30) includes at least two protrusions (34) extending from the main body (36), each protrusion having the tongue press surface (32) on an outer portion of the protrusion. , Each tongue press surface is formed to be in contact with a locking element provided on the strip during locking. In the building panel as described in any one of Claims 1 thru | or 20,
The building panel (1, 1 ') is a floor panel. In the building panel as described in any one of Claims 1 thru | or 21,
The building panel, wherein the upper outer portion of the displaceable tongue is disposed in the displacement groove (40) in an unlocked position. In the building panel as described in any one of Claims 1 thru | or 22,
A building panel wherein the innermost portion of the displaceable tongue (30) is below the outermost portion of the displaceable tongue. In the building panel as described in any one of Claims 1 thru | or 23,
The said tongue press surface (32) is a panel for buildings arrange | positioned under the said tongue latching surface (31). In the building panel as described in any one of Claims 1 thru | or 24,
The building panel is flexible so that it bends downward during locking. In the building panel as described in any one of Claims 1 thru | or 25,
The displaceable tongue (30) is gradually inserted into the tongue groove (20) from a tongue portion adjacent to the installed long edge (2) to another tongue portion adjacent to the free long edge. Panel for building. The building panel according to claim 1,
The strip (6) has a locking groove (14) opened downward in the second panel so as to lock the first and second building panels (1, 1 ') in the horizontal direction. A building panel comprising a locking element (8) formed to cooperate with the device. In the building panel as described in any one of Claims 1 thru | or 27,
The displaceable tongue is a building panel formed by injection molding.