EP2094919A1

EP2094919A1 - Tongue and groove floor panel

Info

Publication number: EP2094919A1
Application number: EP06818832A
Authority: EP
Inventors: Marek Konstanczak
Original assignee: "Barlinek" SA; BARLINEK SA
Current assignee: "Barlinek" SA; BARLINEK SA
Priority date: 2006-11-27
Filing date: 2006-11-27
Publication date: 2009-09-02
Also published as: WO2008064692A1

Abstract

The invention relates to a floor panel in the form of a rectangular board having a usable surface and a base surface positioned opposite of the usable surface, the board being equipped with connecting elements at least on two edge sides that are positioned opposite of each other, wherein the connecting elements are configured in the shape of a first groove on one side, and in the shape of a first tongue on the opposite side, for joining two adjacent floor panels along a separating surface, wherein the groove and the tongue are provided with additional mechanical locking means, namely in the shape of a protrusion of the tongue that is directed toward the base surface, and a raised lip, which is configured as a rail of the groove, and the abutment surface of which, pointing toward the interior of the groove, is part of a recess formed within the groove, and having a second tongue extending on the edge side comprising the first groove along this groove, and having a second groove extending on the edge side comprising the first tongue above this tongue.

Description

Floor panel with tongue and groove

The invention relates to a floor panel in the form of a rectangular, a useful surface and a base plate having the base surface facing surface, which is provided on at least two opposite edge sides with connecting elements for joining along a parting surface of two adjacent floor panels in the form of a first groove on the one Side and in the form of a first spring on the opposite side are formed, wherein the groove and the spring are provided with additional mechanical locking means, in the form of a directed to the base surface projection of the spring, and an upstanding lip, which serves as a parapet of the groove is designed and their Nutinneren facing stop surface is part of a recess formed within the groove, and with a second spring, which extends at the first groove having edge side above this groove, and with a second groove, having at the first spring opposite edge side runs above this spring. Exn floor panel of the type mentioned is known from WO 01/48331. To connect and guide two identical floor panels together, the elasticity of the lip bearing, over the groove protruding bolt pin is used. So that the spring can be inserted into the groove and locked there, the locking pin yields resiliently on impact. The resilient deformation of the contour of the locking pin is enforced by geometric relationships of the groove and the spring, in that the clear width of the groove is smaller than the maximum thickness of the spring. When importing the spring into the groove, the clear width of the groove increases. After snapping it takes her original measure again. Therefore, the known floor panel pays to the well-known group of tongue and groove impact profiles. The disadvantage is that the locking pin can be broken if an excessive or incorrect impact is exercised. Also, the shock requires a metered force that can be easily exceeded and leads to excessive elongation and also to a strong noise.

The object of the invention is to develop a generic floor panel, which essentially requires no elastic deformation of its projecting beyond the groove locking pin during installation and thus requires a less strong impact.

This object is achieved by a floor panel of the type mentioned, in which

a second spring on the longitudinal side of the first groove and the lip having floor panel proceeds, the opposite longitudinal side, which carries the first spring with the projection, has a second,

the second spring is arranged above the first groove and has a lower flank inclined in the laid state upward in the direction of the parting plane of two floor panels, which parting plane is defined by a side end of the useful surface,

the second groove in the laying state is above the first spring and has a lower side surface inclined downwards in the direction of the base surface,

wherein the lower flank of the second spring and the lower side surface of the second groove include a first acute angle with the planar useful surface of the floor panel.

The solution according to the invention allows a simple and silent connection and joining of tongue and groove and thus the floor panels together by pivoting. The installation is simple and ensures the rigidity of the laid floor while maintaining the necessary freedom of movement of the floor panels. The latter is required to compensate for wood moisture changes caused by the microclimate in each room. The assembled to a floor panel floor panels then tend due to the changes in wood moisture for jointing. These displacements and joints can be compensated for by a pressing force exerted on the abutment surface of the lip of the protrusion arranged on the first spring. so that the connection is brought into a stable end position.

For a better understanding of the description, the following terms are explained as used in connection with the description of the present application:

- "floor": consists of several laid, assembled floor panels;

- "effective area" or "tread area" corresponds to the top surface of the floor panels to be produced after laying;

- "base area" corresponds to an underside of the floor panel opposite the tread surface;

a "parting plane" arranged perpendicular to the tread surface and defined in projection on the tread surface by an upper longitudinal or transverse edge of the floor panel extending above the second groove or the second spring, in other words on average by the side end of the floor panel;

- "counter panel" refers to the particular floor panel that interacts with the other;

Terms and conditions such as "top", "top", "bottom", "bottom", "below", "above" refer to the floor panels laid on a level surface, as shown in the drawing. The projection of the first spring - in the laying state of the floor panels - is a rounded down bead bar, which is held in the groove similar to a joint socket. The dimensions are set so that a horizontal, slight movement of the floor panels is possible. The radius of the cross-sectional area of the rounded bead fillet approximates the radius of rounding of the fillet approximately as 1: 5 to 1:10.

The rounding of the bead strip is also useful when one of the floor panels is to be brought together in an inclined or tilted position with the other. The rounding of the bead bar allows a smooth sliding of the first spring over the lip and over a portion of the concave stop surface adjacent to the lip.

The rounding of the bead strip of the first spring can pass over a groove cheek section arranged perpendicular to the base surface of the floor panel into the bottom of a longitudinal groove into which the lip of the counter panel can engage. Preferably, the lip is arranged in the laying state plane-parallel to the bottom of the longitudinal groove.

Preferably, the lower flank of the second spring coincides with an upper side surface of the first groove and, correspondingly, a lower side surface of the second groove with an upper flank of the first spring, the lower flank of the second spring and the lower side surface of the second flute tip a first one Include angle with the tread of the floor panel. Preferably, the first acute angle is in an angular range of 15 ° ± 2 °. This angular range has been determined empirically and agrees with the aforementioned curves of the circle segment and - in the laying state - underlying, concave stop surface. The dimensional ratios of the first groove to the first spring and corresponding to the second groove to the second spring are set so that when laying the floor panels essentially no bending deformations of the protruding parts are to be expected. This is due in particular to the fact that the clear width of the lower, first groove does not fall below the dimensions of the first spring both in a horizontal and in an inclined position of the floor panels to one another, but allows sufficient play, wherein in the final laying position defined assignment is achieved.

It is advantageous that the side surfaces of the first groove converge toward one another in the direction of the groove bottom, preferably at a second acute angle with respect to the tread surface and correspondingly with respect to the base surface of the floor panel. Preferably, the second angle is about 15 °, wherein the two flanks of the first spring have a convergence corresponding to the first groove.

It is advantageous that an end face of the first spring coincides with the plane of separation arranged perpendicular to the tread surface or is set back relative to the parting plane, whereby the material losses during processing can be reduced. However, it is also possible to ments, in which the first spring protrudes beyond the dividing plane.

Preferably, the abutment surface of the lip rises at an acute angle relative to the base surface towards the groove bottom of the first groove and merges into a flat inner surface of a longer arm of the first groove.

The floor panel is preferably made of wood or wood-based material and consists of a middle core layer, a visible surface resulting visible surface and a lower, the base surface resulting layer.

Preferably, below the lip there is a second, inclined abutment surface, which can essentially form a lateral closure of the lower layer on the longitudinal side of the floor panel. The inclined stop surface runs in this embodiment in pairs in inclined abutment surfaces on the other side of the panel in parallel. The laid panels form a gap, which preferably has a width of 0.4 mm in the dry state of the floor panels. The empirically determined column width corresponds to an anticipated increase of linear dimensions of the floor panels as the humidity increases. Preferably, the abutment surfaces form a third sharp angle with a plane oriented perpendicular to the useful or base surface.

The raised lip transmits the load to the second stop surfaces in the lower part of the floor panel, whereby the aforementioned controlled movement of the rounded projection and at the same time a slight Pushing the floor panels parallel to the ground can be caused. If the wood moisture decreases, the floor panels return to their original position.

It is advantageous if at least one ventilation channel is incorporated on the lower layer, which preferably extends parallel to the longitudinal side of the floor panel.

Preferably, the abutment surface of the lip transitions into a planar, inclined side surface, which can be guided at a fifth acute angle with respect to a plane parallel to the parting plane. This inclined side surface opens into an upper end of the lip and forms there a nose, which prevents the slipping of the lower rounding of the first spring from the stop surface on the lip. Preferably, the fifth acute angle is about 15 ° ± 2 °.

Preferably, the first and the second groove are incorporated on the core layer. The core layer may consist of solid wood or at least two strips glued together. The strips can be made of solid wood or wood-based material.

On the stop surface of the lip, a round, concave trough may be arranged whose radius is equal to or greater than the radius of the lower rounding of the first spring.

On the short transverse sides of the floor panels further connecting elements may be provided, consisting of a located on one side of the floor panel third spring and arranged on opposite side third groove. On the third spring may be provided on the base surface directed, preferably triangular projection and on the third groove to the projection compatible bolt groove. The third spring may have an upper, sloping flank which is at a fourth acute angle to the effective area. In turn, a correspondingly inclined, upper side surface can be arranged on the third groove. The size of the fourth acute angle is about 12 °.

It is of great advantage that the connection of two floor panels according to the invention can ensure a required stability and freedom of offset both in the dry state and after the increase in moisture, which occurs primarily within the core layer. The pressure forces occurring during assembly at the contact points of the tongue and groove joints stabilize the position of the floor panels. As stability of the compound is here especially a resistance to the changes in position, d. H. Canting of the usable area in the area of the parting plane, so that the effective area of the entire laid floor comes to lie in one plane.

The solution according to the invention makes possible an embodiment of the floor panels in which the first spring arranged on the longitudinal side lies within a rectangular outline which is defined by the tread surface, parting plane and base surface of the floor panel. This leads to significant material savings in the processing process. Embodiments of the invention are explained in more detail with reference to the drawing. The figures show:

1 shows a floor panel in a schematic plan view of its effective area.

2 shows a cross section A-A according to FIG. 1,

Figures 3a, 3b enlarged details of the mechanical locking means of two floor panels on their longitudinal sides, before and after the connection, also in a cross section;

FIG. 4 shows two floor panels according to FIG. 2 during laying on a level surface; FIG.

FIG. 5 shows the floor panels according to FIG. 4 after installation; FIG.

Fig. 6a shows a second embodiment of the floor panel, also in a cross-section, as in Fig.2;

6b shows an enlarged detail of the connection of two floor panels according to FIG. 6a, on their longitudinal sides;

Figures 7a, 7b enlarged details of the mechanical locking means on longitudinal sides of two floor panels according to a third embodiment, before and after the connection, in a cross section; 8a shows a section BB according to FIG. 1;

Fig. 8b is an enlarged detail of the mechanical

Locking means of two floor panels on their lateral sides, after the connection.

The rectangular floor panels 1, 1 'shown in FIGS. 1, 2, 3a, 3b, 4 and 5 consist in cross section of three layers of different wood materials glued together. In the exemplary embodiment, a substantially consisting of three layers floor panel is shown, which consists of a core layer 2 of transversely arranged needle wood strips 40, an upper layer of sight 3, made of solid wood with an overhead seal, and a lower layer 4 of softwood with a longitudinal direction extending wood fiber alignment.

The upper viewing layer 3 is delimited by a useful surface 24 and the lower layer 4 by a base surface 25, with which the floor panels 1, 1 'are to be laid on a flat surface in the joining composite.

On the opposite edge sides 51, 52, the floor panels are provided with connecting elements which are arranged for joining along a separating surface T. Reference is made in particular to FIGS. 3a and 3b. In the core layer 2 is on a longitudinal side of the floor panel 1 ', a first, grooved, profiled groove 5 and on the opposite longitudinal side of the floor mat Neels 1 a profiled, adapted to the groove 5 spring 6 introduced. The first spring 6 is bounded by an upper flank βa and a lower projection 7. In the laying condition, the tongue 6 of the floor panel 1 engages in the groove 5 of the other, adjacent floor panel 1 '(see FIGS. 3 b and 4).

The first groove 5 is bounded on its side facing the lower layer 4 by a leg 8 projecting beyond this groove 5. This, a locking element forming, extended leg 8 has at its free end an upwardly projecting, the groove 5 defining lip

9, which is therefore designed as a parapet of the groove 5. The stop surface facing the groove is part of a concave recess 29 formed inside the groove 5, which has been produced by cutting woodworking

(see Fig. 3a). From the inside of the lip thus a groove 9 'is formed.

The concave recess 29 troughs down in the direction of its at the top of the lower layer 4 lying vertex 31, wherein the groove 9 'is rounded. The recess 29 continues over the apex 31 in an upwardly in the direction of groove 5 extending, flat inner surface 10 continues. The upwardly continuing inner surface

10 of the recess 29 also forms a lower side surface of the first groove 5. Reference numeral 5a denotes an upper side surface of the first groove 5.

The cavity of the groove 9 'has a first radius Rl, the circle center 32 is positioned approximately on the effective surface 24 of the floor panel. As shown in FIGS. 3 a and 3 b, the lower inner surface 10 and the upper side surface 5 a of the first groove 5 converge toward one another in the direction of the groove bottom 30, where they form a seventh acute angle ω, which is approximately 15 °. The lower inner surface 10 of the groove 5 is inclined α at a first acute angle relative to the base surface 25. The angle is about 15 °. The upper side surface 5a of the first groove 5 is inclined at a second acute angle β with respect to the useful surface 24, which is also about 15 °. The upper flank 6a of the first spring 6 is also inclined at the second acute angle β with 15 ° relative to the useful surface 24.

The downwardly directed projection 7 of the first spring 6 has a bead strip 27 with a rounding in the form of a circle segment. The rounding of the bead strip 27 has a second radius R2, whose length in the present case is about 1/7 of the length of the first radius Rl.

The bead strip 27 merges into a groove bottom 28 of a longitudinal groove 11 into which the lip 9 engages in the laying condition of the floor panels (see FIG. In this case, the longitudinal groove 11 is slightly wider than the plane-parallel to the groove bottom 28 arranged lip 9. After connecting two floor panels 1, 1 'together form the stop surface 9 ^? the lip 9 and the contacting with the stop surface bead strip 27 of the first spring 6 mechanical locking means which prevent a sliding apart of the floor panels parallel to the base surface 25 and the respective substrate. Above the first groove 5, a second spring 12, delimited by upper and lower flanks 35, 33, extends longitudinally. The lower flank 33 coincides with the upper side face 5a of the first groove 5 inclined at the aforementioned acute angle .beta.

The second spring 12 protrudes beyond an upper side end 26 'of the effective area of the floor panel 1', but is shorter than the extended leg 8 provided with the lip 9. The first spring 6, on the other hand, is designed so that its end face 34 is slight opposite to an upper side termination 26 of the effective area of the floor panel 1 is set back. Such a design is advantageous because of relatively small material losses in wood processing. Reference numeral 36 denotes a rectangular outline of the floor panel blank before processing it into a floor panel with a dot-dash line.

On the opposite side of the floor panel, a second groove 13 is disposed above the first spring 6, the lower side surface 37 coincides with the upper edge 6a of the first spring 6. In addition, also at the same acute angle ß is inclined relative to the useful surface 24. The corresponding inclined flanks 33; 6a of the springs 12; 6 and side surfaces 5a, 37 of the grooves 5; 13 allow a laying of floor panels by pivoting movements, without bending the leg. 8

When laying the floor panels 1, 1 'engage the springs 6; 12 in the grooves 5; 13 until the two successive side ends 26, 26 'form a separating level T coming into contact. The second groove 13 of the floor panel 1 then also contacted with the second spring 12 of the Gegenpaneels.

The leg 8 ends with a lying below the lip 9, the first inclined stop surface 14, which is arranged at a third acute angle δ with respect to a plane perpendicular to the base surface 25 plane E. The angle δ is about 30 °. As shown in Fig. 3a, the downwardly open longitudinal groove 11 of the floor panel 1 merges into a second inclined abutment surface 15, which after laying (see Fig. 3b) of two floor panels 1, 1 'is parallel to the first inclined abutment surface 14 ,

The fine dimensions of the floor panels 1, 1 'are chosen such that after laying an oblique gap S (see Figures 3b and 5) between the inclined stop surfaces 14, 15 is formed, the size of which corresponds to an expected increase in linear extent of the floor panels. The column S is in the present case about 0.4 mm wide and can approach zero when the material of the floor panels is slightly wet. Thus, the first and the second lower abutment surfaces 14, 15 can transmit a fourth force F4 indicated in FIG. 5, which can be caused by the swelling of the moistened material. If the material swells, the bead bar 27 can press against the lip 9 and as a result exert a pressure on the second lower stop surface 15 via the first lower stop surface 14. The gap S decreases and in extreme cases assumes the zero value. It is assumed that in the case of a column width of 0.4 mm, the floor panels are m dry state, which sets at a relative humidity between 50 and 60 percent at a room temperature between 18 ⁰ C and 24 ⁰ C.

As can be seen from Figures 2, 3a and 3b, the first and the second groove 5; 13 and the first and the second spring 6; 12 incorporated on the core layer 2. In the embodiment according to FIG. 2, the core layer 2 consists of solid wood, whereas, according to FIG. 6 a, of thin wooden strips 40 glued together.

In the embodiment shown in FIGS. 8a and 8b, tongue-and-groove connection elements are provided on the short transverse sides of the floor panels, in which a third spring 16 located on one side of the floor panel has a triangular projection 17 facing the base surface 25. On one of the spring 16 opposite side of the floor panel is in turn one to the spring 16 compatible, third groove 18 is provided, which merges into a lower, beyond the parting plane T protruding, second leg 20. The third spring 16 has an upper, sloping flank 38, which lies at a fourth acute angle ε to the useful surface 24, the fourth acute angle ε, the size of which amounts to approximately 12 °, also applies to an upper side surface 39 of the groove 18. On the second leg 38, a triangular, adapted to the third groove 18 bolt groove 19 is incorporated, which lies approximately in the parting plane T.

As shown in FIG. 2, the lower layer 4 has at least one along the longitudinal side of the floor panel 1 extending, rectangular in its cross-section ventilation channel 21, with which the moisture occurring in the region of the base surface 25 can be quickly dissipated. Since the humid air is lighter than the dry one, there arises a forced, following the natural drive following air circulation. At the same time, the ventilation channels 21 counteract the excessive stresses that arise as a result of the expansion forces in the region of the connection directed transversely to the fiber orientation and can lead to cracking and splitting of the lower layer 4.

The hygroscopic material of the floor panel swells or contracts due to changes in ambient humidity. When the moisture increases, first, the lower layer 4 and the core layer 2 are exposed to the action of moisture. As a result, the bead strip 27 presses against the abutment surface 9 ^{1 of} the lip 9 with a third force F 3 shown in FIG. 3 b. Even with the aforementioned fourth force F4, the lip 9 is pressed against the lower stop surface 15 of the adjacent floor panel, whereby the column S decreases to zero value. However, the pressure acts against the lower stop surface 15, so that the bead strip 27 slides over the stop surface 9 'of the lip 9 and a slight sliding apart of the two floor panels 1, I ¹ takes place. Thereafter, the moisture of the wood material of the upper layer of sight 3 and an increase in its dimensions increases transversely to the longitudinal direction of the floor panel. The mechanism of action of the changes in moisture increase can be described as follows: As the core layer 2 swells, the thickness of the first spring 6 increases and, at the same time, the width of the first groove 5 decreases Difference of the thickness of the floor panels 1, 1 'can lead to their parting plane T, in which the visible usable areas 24 of the two floor panels are no longer in a cursory level. The additional second groove 13 and second spring 12 serve as a remedy. This additional tongue and groove connection compensates for the changes in the floor panels caused by the swelling and contraction of the first groove 5 and the first spring 6 perpendicular to the base surface, specifically in the parting plane T. As a result, a required mean value of the moisture-induced swelling of the core layer 2 in the region of the parting plane on the longitudinal sides of the two floor panels is achieved.

Since the material-related continuity of the core layer 2 in the region of the springs 6; 12 is interrupted, the position changes of the effective area 24 are limited to the minimum. Thus, a fifth and a sixth force F5 occur; F6 at the contact point of the upper side surface 6a of the second groove 13 and the lower edge 6a of the second spring 12 (see Figures 3b and 7b), which counteract the changes in position of the useful surface 24 in the parting plane and stabilize the resulting compound. Finally, the upper flank 35 of the second spring 12 and an upper surface 41 of the second groove 13 to be contacted with the latter also contribute to the stability of the second spring 12. bond, since the two run parallel to the useful surface 24.

It comes to swelling of the wood material, which is illustrated by the aforementioned forces F3, F4, and to increase the pressure of the bead strip 27 against the stop surface 9 'of the lip.

With decreasing humidity, the interconnected floor panels return to their original position. The stiffness of the floor is not affected. The horizontally directed forces F1, F2 shown in FIGS. 3b, 6b and 7b secure the floor panels from their damage in the parting plane T.

In an embodiment shown in Figures 6a and 6b, the stop surface 9 'of the lip goes into a plane, inclined side surface 42, which is guided at a fifth acute angle Y opposite to the separation plane T parallel plane El and in the height of the lip 9 a Nose 22 forms. The angle y is in the range 12 °. The nose 22 additionally prevents the bead strip 27 from slipping out of the stop surface 9 'via the lip 9. As shown in FIG. 6b, the bead strip 27 of the first spring merges into a lower flank 43 extending parallel to the base surface 25. In this case, the lower, adjoining the stop surface 9 'inner surface 10 of the first groove is formed by the upper side of the lower layer 4 of the floor panel. Between the flank 43 of the spring and the inner surface 10 of the first groove, a gap 47 extending to the bead strip 27 remains. In another embodiment, shown in Figures 7a and 7b, the stop surface 9 'of the lip 9 forms a circular trough 23 of a third radius R3, which is about 8 to 9 times greater than a fourth radius R4 of the lower bead strip 27 of the first spring. A special feature of the present embodiment is that the trough 23 merges via an upwardly directed bending edge 44 into the lower inner surface 10 of the first groove, the latter extending at a sixth acute angle φ with respect to the base surface 25. The angle φ is about 15 °. Accordingly, the lower bead bar 27 protrudes downward over a lower flank 45 and adjoins it via a second crease edge 46. The lower edge 45 is also angled at an angle to the base surface 25. The trough 23 forms after joining two floor panels together a seat for the bead bar 27 and thereby improves the rigidity of the connection. The end face 34 of the first spring 6 is shown in FIG. 7a in the parting plane T.

BLKP 03 PCT list of reference numbers. dt. doc

List of reference numbers:

1, 1 'floor panel

2 core layer

3 visible layer

4 lower layer

5 first groove

5a side surface

6 first spring

6a flank

7 lead

8 thighs

9 lip

9 'throat

10 inner surface

11 longitudinal groove

12 second spring

13 second groove

14; 15 stop surface

16 third spring

17 triangular projection

18 third groove

19 triangular groove

20 thighs (arm)

21 ventilation channel

22 nose

23 trough

24 usable area

25 base area

26; 26 'side finish

27 bead bar

28 groove bottom

29 recess

30 groove bottom

31 vertices

32 circle center

33 flank

34 face

35 flank

36 outline

37 lower side surface

38 flank

39 upper side surface 40 wooden strip

41 surface

42 side surface (v. 22)

43 flank

44 bending edge

45 flank

46 bending edge

47 gap E, El level

First force

F2 second force

F3 third force

F4 fourth power

F5 fifth strength

F6 sixth power

Rl first radius

R2 second radius

R3 third radius

R4 fourth radius

S column

T separation surface α first acute angle ß second acute angle δ third acute angle ε fourth acute angle

Y fifth acute angle φ sixth acute angle ω seventh acute angle

Claims

Claims:

1. Floor panel in the form of a rectangular, a useful surface (24) and a base surface opposite the useful surface (25) having plate on at least two opposite edge sides (51; 52) is provided with connecting elements for joining along a parting surface of two adjacent lying Floor panels are designed in the form of a first groove (5) on one side and in the form of a first spring (6) on the opposite side, wherein the groove (5) and the spring (6) are provided with additional mechanical locking means, namely in the form of a projection (7) of the spring (6) directed towards the base surface (25), and an upstanding lip (9) designed as a parapet of the groove (5) and its stop surface (9 ¹ ) facing the groove inside formed within the groove recess (29), and with a second spring (12) which at the first groove (5) having edge side (51) above this groove (5), un d with a second groove (13) which runs on the opposite edge side (52) having the first spring (6) above this spring (6), characterized the second spring (12) has a lower flank (33) which slopes upwards in the joined state in the direction of the separating surface (T) of two floor panels,

the second groove (13) has a lower side face (37) inclined downwards in the direction of the base face (25),

wherein the lower flank (33) of the second spring (12) and the lower side surface (37) of the second groove (13) both enclose an acute angle (β) with the planar useful surface (24) of the floor panel

and that from the inside of the lip (9) a groove (9 ') is formed,

and protruding from the projection (7) is a rounded bead strip (27) which, in the case of assembled floor panels, engages in the aforementioned groove (9 ') of the lip (9) in an articulated manner.

2. Floor panel according to claim 1, characterized in that in the joined state, the lower edge (33) of the second spring (12) with an upper side surface (5a) of the first groove (5) coincides, and that the underlying side surface (37 ) of the second groove

(13) with the upper flank (6a) of the first spring

(6) covers.

3. Floor panel according to claim 1, characterized in that the rounded bead strip (27) has the shape of a circle segment in its cross section.

4. floor panel according to claim 3, characterized in that the radius (R2) of the cross-sectional area of the rounded bead strip (27) to the radius (Rl) of the rounding of the groove (9 ') approximately as 1: 5 to 1:10 behaves.

5. Floor panel according to claim 4, characterized in that the rounding of the bead strip (27) merges into a groove bottom (28) of a longitudinal groove (11) into which engages the lip (9) in the joining state of the floor panels.

6. Floor panel according to claim 5, characterized in that the lip (9) is arranged with its upper edge in the joining of the floor panels plane-parallel to the groove bottom (28).

7. Floor panel according to claim 5, characterized in that the rounding of the bead strip (27) via a bending edge (46) to its base surface (25) facing flank (43; 45) connects and that the lower vertex of the bead strip on the flank (43; 45) protrudes downwards.

8. Floor panel according to claim 7, characterized in that the base surface (25) facing flank

(43) of the first spring (6) runs parallel to the base surface (25) of the floor panel.

9. Floor panel according to claim 7, characterized in that the base surface (25) facing flank (45) of the first spring (6) relative to the base surface (25) is inclined.

10. Floor panel according to claim 1, characterized in that the upper side surface (5a) and lower inner surface (10) of the first groove (5) converge towards the groove bottom (30) of the first groove of the floor panel at an acute angle (ω).

11. Floor panel according to claim 10, characterized in that the acute angle (ω) in the range of 15 ° ± 2 °.

12. Floor panel according to claim 1, characterized in that the groove (9 ') of the lip (9) merges into a plane inner surface (10) of the first groove (5), which in the direction of groove bottom (30) of the first groove at an acute angle Base surface lifts.

13. Floor panel according to claim 1, characterized in that between the lip (9) and the base surface (25) an oblique end face is arranged, which forms a first stop surface (14), and that also on the opposite longitudinal side of the floor panel an oblique End face is, which forms a second stop surface (15), wherein both oblique end faces are at a third acute angle (δ) to a vertical plane (E) and the dimensions of the floor panel are dimensioned so that after joining two floor panels (1 and 1 ' ) in the dry state, a column (S) between the Stop surfaces (14, 15) provides a predetermined compensation with increase in the dimensions of the floor panels.

14. Floor panel according to claim 13, characterized in that the third acute angle (δ) is about 30 °.

15. Floor panel according to claim 1, characterized in that the floor panel is made of wood or a Hoiz- material and composed of a core layer (2), a visible layer (3) and a lower layer (4), wherein the first and the second groove (5; 13) and the first and second springs (6; 12) are located in the core layer (2).

16. Floor panel according to claim 15, characterized in that the core layer (2) is made of wooden strips

(40) and / or consists of wood pulp permanently glued to the backsheet and the visible layer.

17, floor panel according to claim 1, characterized in that the base surface (25) by at least one ventilation channel (21) is interrupted, which is incorporated in the lower layer (4) and parallel to the longitudinal sides of the floor panel.

18. Floor panel according to claim 1, characterized in that the hollow throat (9 ') in the vicinity of an upper edge of the lip (9) terminates in a flat side surface (42) and there an acute angle (Y) with a vertical plane (El) and forming a nose (22).

19. Floor panel according to claim 18, characterized in that the acute angle (γ) is about 15 °.

20. Floor panel according to claim 1, characterized in that

its transverse edges have connecting elements provided on one side with a third spring (16) and on the other side with a third groove (18),

the third spring (16) has a triangular projection (19) directed towards the base surface (25),

there is a third groove (18) on the opposite side, which has a triangular locking groove (19),

wherein the third spring (16) has an oblique, the projection (17) facing away from side surface (38) at an acute angle (ε) to the plane which is parallel to the effective surface (24) of the floor panel, wherein a corresponding side surface (39 ) of the third groove (18) is chamfered at an equal angle.

21. Floor panel according to claim 20, characterized in that the acute angle (ε) is about 12 °.