EP3581731A1 - Panel - Google Patents

Abstract

The invention relates to a panel with a panel core (4), a panel top (5) with a wear layer, a panel underside (7) and with edge pairs provided in pairs on opposite panel edges (1, 1 '), at least one first edge pair with complementary locking means (2 , 3) is provided, of which a locking means (2) on one groove side of the pair of edges is designed as a locking groove (8) and the complementary locking means (3) on a spring side of the pair of edges is designed as a locking spring (9) which is form-fitting with the locking groove (8 ) fits together, so that similar panels can be locked together, the locking spring (9) of a first panel can be attached to the locking groove (8) of a second panel of the same type when the panel is tilted, and then the two panels can be interlocked with one another in a positive manner by means of a rotating joining movement of the panels are, so the attainable Forms finally counteracts a moving apart of the locked panel edges (1, 1 ') in a direction that is in the plane of the locked panels and at the same time perpendicular to the locked panel edges (1, 1'), the locking spring (9) on its spring top (16) has a contact surface (17, 28) which is directed towards the top of the panel (5), and wherein the upper groove wall (10) has a contact surface (22) which is designed such that it is in the locked state of two panels with the Contact surface (17, 28) of the top of the spring (16) fits together, with a rounding (18) at the front of the locking spring (9) adjoining the contact surface (17, 28) such that the rounding (18) is a free end of the locking spring with a round cross section (9) forms that a round transition to the spring underside (26) is created and that the rounding (18) of the locking spring (9) has a radius (20) that is the same size or larger than the distal extent of the contact surface (17, 28).

Description

The invention relates to a panel with a panel core, a panel top with a wear layer, a panel underside and with edge pairs provided in pairs on opposite panel edges, at least one first edge pair being provided with complementary locking means, of which a locking means on a groove side of the edge pair as a locking groove and that Complementary locking means on a spring side of the pair of edges is designed as a locking spring which fits in a form-fitting manner with the locking groove, so that similar panels can be locked together, the locking tongue of a first panel being attachable to the locking groove of a second similar panel while tilting this panel, and then by a rotating one Joining movement of the panels relative to each other, both panels can be locked with one another in a form-fitting manner, so that the achievable positive locking locks the apart from moving counteracts the panel edges in a direction that lies in the plane of the locked panels and at the same time perpendicular to the locked panel edges, the locking spring on its spring top having a contact surface that is directed toward the top of the panel (the surface normal of the contact surface is directed toward the top of the panel) ), and with the upper groove wall a Has contact surface that is designed so that it fits in the locked state of two panels with the contact surface of the spring top.

A generic panel is from the EP 3 087 280 B1 known. Its overall thickness is relatively small. It can be 2 mm or less than 4 mm in total. The panel edges of the known panel are designed in such a way that the panel edges can be profiled accordingly. The known panel is also provided with a panel core made of a carrier material which has a matrix material comprising plastic. It contains a portion of solid material. According to one embodiment, the solid material is a mineral filler, for example talc.

The invention is based, in particular, on the fact that the panel core has a carrier material comprising a matrix and at least one filler provided therein in the form of particles, it being possible for the carrier material to have a certain fragility. The filler is preferably a mineral filler, such as a layered silicate.

The design of the known panel has weaknesses in terms of the stability of the panel edges. In the prior art, the free end of the locking spring has particular weaknesses; it can be damaged in particular by mechanical action from the outside prior to installation. In particular, if the carrier material has a structure with a certain brittleness, weaknesses occur in the known panel.

The invention has for its object to propose a panel that benefits from a shape of the panel core that improves stability.

According to the invention, the object is achieved in that a rounding on the contact surface connects to the front of the locking spring, that the rounding forms a free end of the locking spring with a round cross section, that a round transition to the underside of the spring is created, and that the rounding of the locking spring has a radius , which is the same size or larger than the distal extension of the contact surface.

The size of the radius of the curve is preferably in a range from 10% to 20% of the total thickness of the panel, particularly preferably in the range from 10% to 15% of this total thickness.

The cross section of the free end of the locking spring is designed as a relatively large radius. This measure has improved the stability of the panel edge equipped with the locking spring. Even if the panel core has a carrier material that tends to be fragile, the proposed panel turns out to be more stable than the prior art. In particular, it can be seen that a panel core made of a carrier material with a certain brittleness achieves better cohesion of the entire structure. Without being bound by this theory, it turns out to the inventor that something special arises when plate-shaped mineral particles, for example from talc, are used. The plate-shaped mineral particles are initially randomly embedded in a matrix during production. They are in a granulate during manufacture. If, however, a bed of granulate is heated and shaped into a plate in a continuous process, then a certain orientation of the plate-shaped particles appears, predominantly in a direction parallel to the plate plane. This may be due to the fact that a certain orientation of the plate-shaped particles under the action of heat and one certain pressure, which is caused in a direction perpendicular to the plate plane.

The invention is preferably intended for panels which have a total thickness in the range from 2 to 6 mm, more preferably the total thickness is between 2.5 to 5 mm and particularly preferably between 2.8 and 4 mm.

The locking groove expediently has a groove base which is round in cross section and adjoins the contact surface of the upper groove wall, the groove base having a radius which is the same size or larger than the distal extension of the contact surface. This groove base is further preferably adapted to the front rounding of the locking spring in such a way that, in the locked state, a small gap remains between the bottom of the groove and the rounding of the locking spring. This ensures that a closed joint is created above the locking spring when two panels are locked.

A further improvement of the panel can be achieved if the contact surface is inclined downwards in the distal direction, the angle of inclination of the contact surface with respect to the horizontal being in a range from 3 ° to 15 °, preferably 5 ° to 10 ° and particularly preferably 7 ° 9 °. The panel level is usually aligned horizontally when two panels are locked. In the context of the invention, the term “horizontal” means an orientation parallel to the plane of the panel or the top of the panel. Due to the inclination of the contact surface, in particular in the case of a panel core made of a carrier material that has brittleness, better cohesion can be achieved, which come to the surface in the region of the contact surface.

The curvature of the locking spring expediently merges into an outer surface that extends along the underside of the spring curved contour (convex). The convex contour can be a radius.

It has proven particularly useful if the outwardly curved contour of the underside of the tongue is an outwardly curved radius, the center of which is located above the upper side of the panel. This measure forms a relatively elongate spring underside. It works together with an equally elongated lower groove wall, which has a concave contour adapted to the underside of the tongue. The curvatures of the bottom of the tongue and the lower groove wall are small and the area is relatively large. The panel edge with the locking spring benefits from a high load-bearing capacity between the tongue underside and the lower groove wall when the top of the panel is loaded.

A tangential transition from the rounding of the free end of the locking spring into the convex contour of the underside of the spring is preferably provided. Dispensing with an angular transition also increases the stability of the panel edge or panel at this point.

The locking groove can have a short upper groove wall with a free end and a long lower groove wall on which a marginal strip is provided distally.

It is advantageous if the edge strip has a holding surface and the surface normal of the holding surface points in the proximal direction. Arranged in this way, the holding surface can achieve a good holding force in order to counteract a movement of the panel edges apart perpendicularly from one another in the panel plane (horizontally).

The locking spring expediently has a counter-holding surface which is provided with a proximally oriented surface normal, and that the counter-holding surface in the locked state of two panels with the holding surface of the edge strip the lower groove wall interacts. The concave contour of the lower groove wall can also rise in the direction of the edge strip and, together with the matching convex contour of the underside of the tongue, form an overlap that counteracts a movement of the panel edges apart in the above-mentioned horizontal direction, but this is by means of a pronounced holding surface and for this matching counter-holding surface achievable horizontal locking effect significantly improved.

Further favorable properties can be achieved if the holding surface of the edge strip and the counter-holding surface of the locking spring are arranged parallel to one another in the locked state and at the same time relative to the solder of the top of the panel in an angular range from -10 ° to + 10 °, preferably -5 ° to + 5 ° are arranged. If the holding surface / counter-holding surface is in the negative part of the angular range, there is an additional undercut between these two surfaces. Due to the additional undercut, locking is also effected in a direction perpendicular to the panel plane (vertical). To produce the lock, it is necessary during the joining process to have a certain elastic deformation in the area of the locking means in order to produce the additional undercut and to bring the holding surface into engagement with the counter-holding surface.

If the holding surface / counter-holding surface is arranged differently, namely in such a way that they lie in the positive part of the angular range, the locking means can be connected to one another without elastic deformation and the locked state can be produced more easily. Then locked panel edges only have a locking effect in the horizontal direction. This locking effect is the better the lower the angle of inclination of the solder on the panel surface differs.

At the free end of the upper groove wall there is useful an abutment surface, the panel edge with the locking spring above it having a counter abutment surface which, when two panel edges are locked together, cooperates with the abutment surface of the upper groove wall. The mating surface / mating surface limits the joining movement during the production of the lock, i.e. the locking spring can then not be moved deeper into the locking groove. At the same time, a closed joint forms between the panel edges involved on the top of the panel.

Both the abutting surface mentioned and the counter-abutting surface are expediently arranged perpendicular to the plane of the panel. If a certain contact pressure occurs that presses the abutment surface and the counter-closing surface against one another, then these surfaces can absorb the contact pressure. There is then no risk that the two surfaces will slide relative to each other and that there may be a height offset on the top of the panel. If the pairing of the abutment surface / counter-abutment surface were inclined with respect to the solder of the panel plane, a relative displacement of these surfaces would be risked, which could have a disadvantageous effect on the top side of the panel.

A further benefit is obtained if the lower groove wall has a recess at the transition to the edge strip, the recess merging into the holding surface of the edge strip. This measure is advantageously accompanied by the fact that the holding surface at its lower end can be better used. For example, it can also extend somewhat deeper down into the recess. At least the recess creates a cut-out area that helps the underside of the spring to settle freely and that The counter-holding surface of the locking spring can position exactly on the holding surface of the edge strip of the lower groove wall.

If the above-mentioned depression with which the lower groove wall merges into the holding surface of the edge strip is dispensed with, then the edge strip can alternatively be designed somewhat higher in order to enlarge the holding surface upwards and to give it the desired stability.

Furthermore, it is considered advantageous if the top of the panel has an edge break on that panel edge with the locking groove and / or has an edge break on the panel edge with the locking spring. In this way, a panel edge can also be improved in the area of the upper side of the panel, because a broken edge, which can be designed, for example, as a phase or radius, acts as edge protection.

The locking spring has on its upper side a distal extension from the mating surface to the free end of the locking spring.

If, in addition, two locked panel edges each have an edge break, for example one chamfer each, then two edge breaks form a common free space. Below the free space, the panels touch in a plane that can be marked with a center line. The common free space can be, for example, a V-shaped free space (V-joint). It is preferred if the width of the common free space is greater than the distal extension of the top of the locking spring.

In addition, it is considered expedient to put the cross section of the common free space in an appropriate relationship with the part of the cross section of the locking spring which projects beyond the plane of the mentioned center line. Simple said the front part of the locking spring should have a cross section which is approximately the same size as the free cross section of the free space.

More generally, the front part of the locking spring can have a cross section that is to a certain extent smaller or to a certain extent larger than the free cross section of the free space. The cross section of the front part of the locking spring should then be in the range of 80-120% of the size of the cross section of the free space.

Alternatively, the width of the edge break and / or its depth can be in a range from 5% to 20%, based on the total thickness of the panel. In this way, the dimensions of the edge break are related to the size of the radius of the curve of the locking spring; there is a certain overlap based on the total thickness of the panel, because the radius should be in the range of 10% - 20% of the total thickness.

Fig. 1

ein Ausführungsbeispiel des erfindungsgemäßen Paneels

Fig. 2

eine alternative Gestaltung für den Ausschnitt im Bereich von II in Fig. 1,

Fig. 3

eine erste alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 4

eine zweite alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 5

eine dritte alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 6

eine vierte alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 7

eine fünfte alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 8

eine sechste alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 9

eine siebte alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich,

Fig. 10

eine achte alternative Gestaltung für den in Fig. 1 mit III vermerkten Bereich.

The invention is illustrated by way of example in a drawing and described in detail. Show it:

Fig. 1

an embodiment of the panel according to the invention

Fig. 2

an alternative design for the cutout in the area of II in Fig. 1 .

Fig. 3

a first alternative design for the in Fig. 1 area marked with III,

Fig. 4

a second alternative design for the in Fig. 1 area marked with III,

Fig. 5

a third alternative design for the in Fig. 1 area marked with III,

Fig. 6

a fourth alternative design for the in Fig. 1 area marked with III,

Fig. 7

a fifth alternative design for the in Fig. 1 area marked with III,

Fig. 8

a sixth alternative design for the in Fig. 1 area marked with III,

Fig. 9

a seventh alternative design for the in Fig. 1 area marked with III,

Fig. 10

an eighth alternative design for the in Fig. 1 area marked with III.

Fig. 1 shows an embodiment of a panel according to the invention. The panel is shown divided in order to be able to represent its opposite panel edges 1 and 1 'and their complementary locking means 2 and 3 in the locked state. Of course, the panel edges shown in detail can also be understood as a representation of two panels which are not severed.

In practice it is quite common to cut through a panel, for example if the panel is too long at the end of a row of panels. Then it is shortened appropriately and cut for the purpose. The separated remnant can usually be used at the beginning of a new row of panels, the side with the intersected area forming the beginning of the row and locking means being present at the opposite end in order to lock a new panel thereon. Complementary locking means of a severed panel consequently fit into one another and can in principle be locked with one another, as in FIG Fig. 1 recognizable.

The design according to the invention is preferably provided so that the stressed panels can be made with a small overall thickness. The small overall thickness should be possible even if the panel core is made of a carrier material that has fragility.

The panel according to Fig. 1 consequently has a panel core 4 made of a carrier material, which has a plastic as the matrix material. A portion of solid material is provided as a filler, namely a mineral filler in the form of talc. This carrier material has a certain fragility due to the filler.

In order to obtain a panel with good stability despite this peculiarity, in particular good stability of the panel edges 2 and 3, these have a special design.

Basically it is about Fig. 1 around a panel with a top side 5 of the panel with a wear layer 6, a bottom side 7 of the panel as well as with panel edges 1 or 1 ′ lying opposite one another in pairs, which form a pair of edges. At least that in Fig. 1 The edge pair shown has complementary locking means 2 or 3 with a tongue and groove profile, namely a locking groove 8 on a groove side of the edge pair and a locking spring 9 on a tongue side of the edge pair. In the locked state, this edge pair acts positively against moving two panels apart perpendicular to the locked panel edges and away from each other. At the same time there is a positive locking effect of the panel edges in the vertical direction.

On the groove side, the panel has an upper groove wall 10 and a lower groove wall 11. The upper groove wall has a free end on which a flat abutment surface 12 is formed. The abutment surface 12 is arranged perpendicular to the panel plane.

The lower groove wall 11 is longer than the upper groove wall. It protrudes further in the distal direction than the upper groove wall. It is provided at its free end with an edge strip 13 which has a holding surface 14 which is arranged in the proximal direction, i.e. their surface normal is oriented proximally.

On the spring side, the panel has the locking spring 9 and above it a counter abutment surface 15 which interacts with the upper groove wall 10, namely touches the abutment surface 12 thereof when the panel edges 1 and 1 'are in the locked state.

The locking spring 7 has a spring top 16 with a contact surface 17 which is directed towards the top 5 of the panel. In the embodiment of the Fig. 1 the contact surface 17 is arranged parallel to the top 5 of the panel. A curve 18 adjoins the contact surface 17. The rounding has a radius 20 which is larger than the distal extension 21 of the contact surface 17. In this way, the free end of the locking spring 9 is provided with a comparatively large rounding 18 and is therefore more stable than known panels which are more pointed or have corners , In particular, it can be seen that the carrier material holds together better at the free end of the locking spring 9. The contours are produced by machining, for example milled.

The locking groove 8 has on the upper groove wall 10 a contact surface 22 which is arranged parallel to the contact surface 17 and according to Fig. 1 on this. The contact surface 22 merges into a groove base 23 which has a radius 24 and is adapted to the rounding 18 of the locking spring 9, so that the rounding 18 fits into the locking groove 8 and a small gap between the rounding 15 and the radius 24 of the groove base 23 remains in the Order of magnitude of tenths of a millimeter or fractions thereof.

The large curve 18 on the front of the locking spring 9 merges into an outwardly curved (convex) contour 25, which forms the spring underside 26. The convex contour 25 lies on a large radius 27, the center of which is far above the panel. The radius 27 is several times larger than the total thickness T of the panel. The contour 25 of the spring underside 26 arched in this way extends far in the proximal direction. At its end, the contour 25 merges into a counter holding surface 29. The counter holding surface has a surface normal in the proximal direction. In the locked state, the counter-holding surface 29 interacts with the above-mentioned holding surface 14 of the edge strip 13 of the lower groove wall 11. To Fig. 1 are the holding surface 14 and the counter-holding surface 29 parallel to each other and touch. Furthermore, this surface pairing of holding surface / counter-holding surface is inclined relative to the solder L of the top side 5 of the panel, the inclination angle α relative to the solder being identified with +/- sign in the sense of the invention. In the present case, the angle of inclination α is + 5 ° according to this definition.

In Fig. 2 shows an alternative design for the cutout shown in Fig. 1 is marked with II. A section of the locking groove 8 and a section of the locking spring 9 can be seen, which are in the locked state. An edge break 29 or 30 in the form of a 45 ° bevel 29a and 30a is provided on the edges of the panel top 5. Together, the 45 ° chamfers form a free space 31 in the form of a V-groove 31a. In this exemplary embodiment, the depth of the V-groove 31a or the depth of the chamfer is 19% of the total thickness T of the panel. The curve 18 on is also recognizable free end of the locking spring 9, which in this embodiment has a radius 20, the size of which is 12% of the total thickness T of the panel. In addition, in contrast to the embodiment of the Fig. 1 on the spring top 16 of the locking spring 9, a contact surface 28 is provided which is inclined by an angle of inclination β with respect to the horizontal. The angle of inclination β has an amount of 8 ° here, so that the contact surface 28 runs downward toward the curve 18.

According to the locking groove 8 Fig. 2 the upper groove wall 10 is shown, which has an abutment surface 12 at its free end. The abutment surface 12 is arranged perpendicular (vertical) to the top 5 of the panel. Due to the edge break 29 above, the abutment surface 12 is somewhat smaller than in the exemplary embodiment of FIG Fig. 1 ,

The Figures 3 to 10 show alternative designs for the area that in Fig. 1 is marked with III. Each of these alternatives can be seen as a modification of Fig. 1 provide for, as well as use together with the modification that is in Fig. 2 has already been proposed.

Area III is about the lower groove wall 11 of the locking groove 8, which is provided with the edge strip 13, and the matching contour 25 of the spring underside 26 of the locking spring 9.

Fig. 3 shows a section of the lower groove wall 11 with the edge strip 13, which has a proximally arranged holding surface 14, by which is meant that the surface normal of the holding surface 14 is oriented proximally. In this exemplary embodiment, the holding surface is inclined relative to the solder L on the upper side of the panel by + 5 °. This embodiment brings about a form-locking locking against moving the locked panel edges apart, namely in one Direction that is in the plane of the locked panels and at the same time perpendicular to the locked panel edges. A locking effect against moving apart the locked panel edges perpendicular to the panel plane (vertical) is according to Fig. 3 not provided. The contour 25 of the spring underside 26 is curved outwards (convex), the curvature being a large radius 27 which appears almost straight in the illustration. Proximally, the contour 25 of the spring underside 26 merges into a counter-holding surface 29 which is inclined to match the holding surface 14 of the edge strip 13. The pairing of the holding surface / counter-holding surface is parallel and in contact with one another. The transition between the curved contour 25 of the spring underside 26 and the counter-holding surface 29 is provided as a tangential transition with a small radius 32.

At its upper end, the edge strip 13 is bent downward in the distal direction. The locking spring 9 has in this area a recess 33 which is larger than the edge strip 13. In the distal direction, a gap 34 (air) is provided between the edge strip 13 and the recess 33. The contour of the recess 33 is also curved to match the edge strip 13. This arcuate design of edge strip 13 and recess 33 in turn benefit stability, in particular if the panel core is made of a carrier material with a certain degree of brittleness, better cohesion of the structure is achieved and less breakage occurs.

In Fig. 4 an alternative design is shown on Fig. 3 based on which reference is made. It differs by a changed contour 25 of the outwardly curved spring underside 26 and the matching contour of the lower groove wall 11. The lower groove wall 11 has a low point 35 and from there a certain (slight) increase in the distal direction. This design is preferred if a contact surface on the top of the locking spring 9 has an inclination, as in the example of FIG Fig. 2 the contact surface 28, wherein it refers to the in Fig. 2 intended edge break does not arrive. When the panels are moved apart with a certain elastic deformation, the aforementioned increase in the contour of the lower groove wall 11 can cause the locking spring 9 to slide up along the increase. At the same time, the contact surface 28 provided at the top of the locking spring 9 can slide along a complementary contact surface 22 of the upper groove wall 10 because this has an inclination angle β which is approximately parallel to the increase in the contour of the lower groove wall 11.

The embodiment of the Fig. 5 is based on that Fig. 3 , In contrast to Fig. 3 However, the lower groove wall 11 has a recess 36 at the transition to the edge strip 13, which merges into the holding surface 14 of the edge strip 13. The recess 36 is groove-shaped with a round cross section, which serves for stability.

Fig. 6 is an alternative design based on Fig. 5 based on which reference is made. It differs by a modified contour 25 of the outwardly curved tongue underside 26 and the matching contour of the lower groove wall 11. These contours are designed in the same way as in FIG Fig. 4 , ie the lower groove wall 11 has a low point 35. From the low point 35 in the distal direction, a certain (slight) increase towards the edge strip 13 is provided. This design is preferred in combination with one, as in the example of Fig. 2 , inclined contact surface 28 on the spring top 16 of the locking spring 9, for the same reasons as mentioned above.

The embodiment of the Fig. 7 is based on that Fig. 5 , It differs in the design of the wheel bar 13, which now has a proximal holding surface 14, which in turn is inclined relative to the solder L of the panel top 5, but compared to Fig. 5 in the opposite direction, which means an inclination angle α of -5 ° in the present exemplary embodiment. The locking spring 9 has a proximal counter-holding surface 29 which, in the locked state, is arranged parallel to the holding surface 14 of the edge strip 13 and touches it flatly.

If the pairing of holding surface / counter-holding surface is arranged with an inclination angle α of -5 °, then there is an additional undercut between the two surfaces of this pairing, which also causes locking in a direction perpendicular to the panel plane (vertical). In order to bring this undercut into engagement, a certain elastic deformation in the area of the locking means 2 and 3 is necessary during the joining process.

Fig. 8 shows an embodiment, the holding surface / counter-holding surface identical to Fig. 7 are arranged at an angle of inclination α of -5 °, so that they can cause a lock perpendicular to the panel plane (vertical). In addition, the contour 25 of the outwardly curved tongue underside 26 as well as the matching contour of the lower groove wall 11 is modified, as above in FIG 4 and 5 , ie the lower groove wall 11 has a low point 35 and from there a certain (slight) increase in the distal direction towards the edge strip 13. This design is again preferred in combination with an inclined contact surface on the top of the locking spring, as in the example of Fig. 2 the contact surface 28. The same advantage results as above Fig. 4 described. Furthermore, the lower groove wall 11 is provided with a groove-shaped depression 36, as in FIG Fig. 5 referred to.

Fig. 9 is an embodiment, the holding surface / counter holding surface identical with Fig. 7 are arranged at an angle of inclination α of -5 °, so that they can cause a lock perpendicular to the panel plane (vertical). Differing to Fig. 7 however, a groove-shaped depression 36 in the lower groove wall 11 is dispensed with.

Fig. 10 is a further embodiment with a holding surface / counter-holding surface arranged at an angle of inclination α of -5 °, so that it causes a locking perpendicular to the panel plane (vertical), insofar Fig. 10 identical with Figs. 7, 8 and 9 , However, the contour 25 of the outwardly curved tongue underside 26 and the matching contour of the lower groove wall 11 differ, which has a low point 35 and from there has a certain (slight) increase in the distal direction towards the edge strip 13.

LIST OF REFERENCE NUMBERS

1

panel edge

1'

panel edge

2

locking means

3

locking means

4

panel core

5

Paneeloberseite

6

wear layer

7

Paneelunterseite

8th

locking

9

locking spring

10

upper groove wall

11

lower groove wall

12

Abutment surface (upper groove wall)

13

sidebar

14

Holding surface (sidebar)

15

Against abutment surface

16

Spring top

17

contact area

18

curve

20

radius

21

Extension (contact surface)

22

Touchpad

23

groove base

24

radius

25

convex contour (spring underside)

26

Spring-side

27

Radius (spring underside)

28

contact area

29

Counter surface (spring underside)

30

edge diffraction

30a

45 ° chamfer

31

edge diffraction

31a

45 ° chamfer

32

free space

32a

V-joint

33

recess

34

gap

35

low

36

deepening

L

solder

T

total thickness

α

Tilt angle (sidebar)

β

Inclination angle (contact surface)

Claims (15)

Panel with a panel core (4), a panel top side (5) with a wear layer, a panel underside (7) and with edge pairs provided in pairs on opposite panel edges (1, 1 '), at least one first edge pair with complementary locking means (2, 3) is provided, of which a locking means (2) on one groove side of the pair of edges is designed as a locking groove (8) and the complementary locking means (3) on a tongue side of the pair of edges is designed as a locking spring (9) which fits positively with the locking groove (8), so that similar panels can be locked to one another, the locking spring (9) of a first panel can be attached to the locking groove (8) of a second panel of the same type while tilting this panel, and then both panels can be positively locked to one another by a rotating movement of the panels relative to one another, so that the achievable form fit is a certificate moving the locked panel edges (1, 1 ') counteracts in a direction that is in the plane of the locked panels and at the same time perpendicular to the locked panel edges (1, 1'), the locking spring (9) on its spring top (16 ) has a contact surface (17, 28) which is directed towards the top of the panel (5) , and wherein the upper groove wall (10) has a contact surface (22) which is designed such that it fits in the locked state of two panels with the contact surface (17, 28) of the spring top (16), characterized in that at the front the locking spring (9) has a rounding (18) adjoining the contact surface (17, 28) such that the rounding (18) forms a free end of the locking spring (9) with a round cross section that creates a round transition to the underside of the spring (26) , and that the rounding (18) of the locking spring (9) has a radius (20) which is the same size or larger than the distal extension of the contact surface (17, 28). Panel according to claim 1, characterized in that its total thickness is in the range of 2 to 6 mm, preferably between 2.5 to 5 mm and particularly preferably between 2.8 and 4 mm. Panel according to Claim 1 or 2, characterized in that the locking groove (8) has a groove base (23) which is round in cross section and which adjoins the contact surface (22) of the upper groove wall (10), and in that the groove base (23) of the locking groove (8) has a radius (24) which is the same size or larger than the distal extension of the contact surface (22). Panel according to one of claims 1 to 3, characterized in that the contact surface (28) is inclined downwards in the distal direction, that the angle of inclination (β) of the contact surface (28) with respect to the horizontal lies in a range of 3 ° - 15 °, preferably 5 ° - 10 °, particularly preferably 7 ° - 9 °. Panel according to one of claims 1 to 4, characterized in that the rounding (18) of the locking spring (9) merges into an outwardly curved contour (25) which extends along the underside of the spring (26). Panel according to claim 5, characterized in that the outwardly curved contour (25) of the underside of the spring (26) is an outwardly curved radius (27), the center of which is located above the upper side of the panel (5). Panel according to claim 5 or 6, characterized in that there is preferably a tangential transition from rounding (19) into the convex contour (25) of the underside of the spring (26). Panel according to one of claims 1 to 7, characterized in that the locking groove ((8) has a short upper groove wall (10) with a free end and a long lower groove wall (11), on the distal edge strip (13) is provided , Panel according to claim 8, characterized in that the edge strip (13) has a holding surface (14) and that the surface normal of the holding surface (14) points in the proximal direction. Panel according to claim 8 or 9, characterized in that the locking spring (9) has a counter-holding surface (29) which is provided with a proximally oriented surface normal, and in that the counter-holding surface (29) in the locked state of two panels with the holding surface (14) the edge strip (13) of the lower groove wall (11) interacts. Panel according to claim 9 or 10, characterized in that the holding surface (14) of the edge strip (13) and the counter-holding surface (29) of the locking spring (9) are arranged parallel to one another in the locked state and are arranged in an angular range of -10 ° to + 10 °, preferably -5 ° to + 5 °, relative to the solder (L) on the top of the panel (5). Panel according to one of claims 1 to 11, characterized in that an abutment surface (12) is provided at the free end of the upper groove wall (10), that the panel edge (1 ') with the locking spring (9) above it has a mating abutment surface (15 ) which, when two panel edges (1, 1 ') are locked together, interacts with the abutment surface (12) of the upper groove wall (10). Panel according to one of claims 8 to 12, characterized in that the lower groove wall (11) at the transition to the edge strip (13) has a recess (36), and that the recess (36) merges into the holding surface (14) of the edge strip ( 13). Panel according to one of claims 1 to 13, characterized in that the top side of the panel (5) has an edge break (30) on the panel edge (1) with the locking groove (8) and / or on the panel edge (1 ') with the locking spring ( 9) has an edge break (31). Panel according to one of claims 1 to 14, characterized in that the locking spring (9) extends in the distal direction beyond the counter abutment surface (15), and that both panel edges (1, 1 ') have edge breaks (30, 31) which form a free space (32) in the locked state.

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