Floor panel for forming a floor covering

Abstract

A floor panel arranged to be installed according to the fold-down principle, with a first pair and a second pair of edges. The second pair of edges coupling parts are arranged to be coupled to each other by a downward movement with two contact zones at opposite sides of a male part which fits into a female part. The ratio between the horizontal distance between the middle of the first contact zone and the middle of the second contact zone, and the vertical distance between the middle of the first contact zone and the middle of the second contact zone is more than 5, and/or wherein well-defined support points are applied.

Claims

1. A floor panel for forming a floor covering, wherein this floor panel comprises a first pair of opposite edges as well as a second pair of opposite edges; wherein the first pair of opposite edges comprises coupling parts, which allow that two of such floor panels can be mutually coupled to each other, wherein the coupling parts comprise a horizontally active locking system, which, in a coupled condition of two of such floor panels, effects a locking in a plane of the floor panels and perpendicular to the respective edges; wherein the coupling parts also comprise a vertically active locking system, which, in a coupled condition of two of such floor panels, effects a locking transverse to the plane of the floor panels; wherein the coupling parts are substantially made of a material of the floor panel itself; wherein the coupling parts are configured such that two of such panels can be coupled to each other at these edges by a turning movement; wherein the second pair of opposite edges comprises coupling parts at both edges, which allow that two of such panels mutually can be coupled to each other, wherein the coupling parts comprise a horizontally active locking system, which, in a coupled condition of two of such panels, effects a locking in the plane of the panels and perpendicular to the respective edges; wherein the coupling parts also comprise a vertically active locking system, which, in a coupled condition of two of such panels, effects a locking transverse to the plane of the panels; wherein the coupling parts are substantially made of the material of the panel itself; wherein the horizontally active locking system of the second pair of edges is formed at least of an upward-directed lower hook-shaped part, which is situated on one edge of said second pair of edges, and a downward-directed upper hook-shaped part, which is situated on the opposite edge, wherein the lower hook-shaped part consists of a lip with an upward-directed locking element, which, proximally thereof, defines a female part in the form of a recess, whereas the upper hook-shaped part consists of a lip with a downward-directed locking element which forms a male part; wherein the coupling parts are configured such that two of such panels can be coupled to each other at their respective edges by a downward movement of the one panel in respect to the other; wherein the coupling parts comprise a first locking part and a third locking part, which by respective contact surfaces, define in the coupled condition of two such panels a first contact zone at a first side of the male part and of the female part; wherein the contact surfaces define at least one inclined tangent line; wherein the vertically active locking system of the second pair of edges comprises a second, vertically active, locking part and a fourth, vertically active, locking part, which, by contact surfaces define in coupled condition of two such panels a second contact zone, wherein the contact surfaces define at least one inclined tangent line; wherein the second contact zone is provided at the distal end of the male part and at the proximal end of the female part; wherein the proximal end of the female part comprises the fourth, vertically active, locking part; wherein the first contact zone and the second contact zone are situated at opposite sides of the male part and of the female part; wherein the male part has a distal side and a proximal side, wherein the second locking part is situated at the distal side; wherein the second pair of second pair of opposite edges each comprise a closing plane, wherein the closing planes of both edges of the second pair of opposite edges are substantially perpendicular to the surface of the floor panel, and wherein the closing planes by contact surfaces define in coupled condition of two such panels a third contact zone provided closer to the panel surface than the second contact zone; wherein underneath the fourth locking part the floor panel comprises an incision reaching proximally into the floor panel, wherein the incision is cutting the lip of the lower hook-shaped part free, wherein this incision extends inward over a distance, which, measured from the closing plane provided at the edge comprising the fourth locking part, shows a horizontal depth which is at least 1/10 of the horizontal distance between a middle of the first contact zone and the middle of the second contact zone; wherein the coupling parts of the first pair of opposite edges and the second pair of opposite edges are configurated such that the panel can be installed according to the fold-down principle.

2. The floor panel of claim 1, wherein this incision extends inward over a distance, which, measured from the closing plane provided at the edge comprising the fourth locking part, shows a horizontal depth which is at least 1/7 of the horizontal distance between the middle of the first contact zone and the middle of the second contact zone.

3. The floor panel of claim 1, wherein the tangent line in the first contact zone forms an angle with the surface of the panel in the proximal direction of the coupled panel edge comprising the upward-directed lower hook-shaped part of at least 90 degrees.

4. The floor panel of claim 1, wherein the lower hook-shaped part, at the distal side of its distal end, is provided with one or more mechanical vertically active locking parts, for cooperation with a locking part, provided for this purpose, of an adjoining such panel.

5. The floor panel of claim 1, wherein the closing plane at the edge comprising the downward-directed locking element is provided at the distal end of the downward-directed locking element; wherein the downward-directed locking element comprises a recess, wherein said recess is provided below the closing plane; and wherein said recess extends at least partially proximal from said closing plane.

6. The floor panel of claim 1, wherein the upper surface of the upward-directed locking element comprises a section which is in uncoupled condition of the floor panel parallel with the surface of the floor panel.

7. The floor panel of claim 1, wherein in respect to the plane of the panel, the tangent line which is defined by the first and third locking parts is steeper than the tangent line which is defined by the second and fourth locking parts, or, the angle of the first-mentioned tangent line with the horizontal, as measured from the first contact zone towards the female part, is larger than the angle of the second-mentioned tangent line with the horizontal, as measured from the second contact zone towards the female part; wherein the difference in size between both mentioned angles is at least 5 degrees.

8. The floor panel of claim 1, wherein on the male part, at a height lower than the second contact zone, at least one contact surface is provided, which, in the coupled condition, together with a contact surface at the female part of the then coupled panel, forms a support point which limits the movement of the male part in a downward direction.

9. The floor panel of claim 1, wherein the male part comprises a proximal portion at a proximal half thereof extending downwardly more toward a lower side of the panel than a distal portion at a distal half of the male part.

10. The floor panel of claim 1, wherein the aforementioned two tangent lines are upwardly inclined towards each other as from their respective contact zones.

11. The floor panel of claim 1, wherein at the second pair of edges the ratio between the horizontal distance between a middle of the first contact zone and a middle of the second contact zone and the vertical distance between the middle of the first contact zone and the middle of the second contact zone, is more than 5.

12. The floor panel of claim 1, wherein the contact surfaces of the second contact zone, seen in cross-section extend both to the left and to the right of the vertical closing plane, wherein the vertical closing plane is defined as the plane perpendicular to the panel surface and defined by the contact between the closing planes.

13. The floor panel of claim 1, wherein at a lower side of the lip of the lower hook-shaped part, a recess extending up to the distal end of the lip is present, said recess allowing a downward bending of the lip, or anyhow of at least a portion thereof, wherein the recess is configured such that the aforementioned downward bending substantially provides for a tilting movement of the upward-directed locking element.

14. The floor panel of claim 1, wherein, at the lower edges of the male part, guiding surfaces are provided, which are configured such that the male part, during the downward movement thereof, automatically is guided into the female part, at which the guiding surfaces are located, too, and that the male part therein always is becoming seated with at least the lower portion in the female part before an apart-pressing force is created as a result of the locking parts of the second contact zone initially moving along each other.

15. The floor panel of claim 1, wherein the upward-directed locking element, the downward-directed locking element and the pertaining contact surfaces of the first contact zone are configured such that the upward-directed locking element with its pertaining contact surface, in the coupled condition, adopts a somewhat tilted position in respect to the position which is taken by this contact surface in the free condition.

16. The floor panel of claim 15, wherein both contact surfaces of the first contact zone, in the not coupled condition, mutually are oriented so deviating that, in the coupled condition, mutually a less deviating or not deviating orientation is obtained.

17. The floor panel of claim 1, wherein at the lower side of the male part, two support points are provided, which in mutual respect are situated at a different height level relative to a lower side of a lower surface of the floor panel, wherein one support point is situated proximally from another support point of the two support points, and wherein the most proximal support point of the two support points is situated lower relative to the lower surface of the floor panel than the another support point of the two support points.

18. The floor panel of claim 1, wherein the ratio between, on the one hand, the horizontal distance between the middle of the first contact zone and the middle of the second contact zone and, on the other hand, the vertical distance between the middle of the first contact zone and the middle of the second contact zone, is more than 5; wherein at the male part, at a height lower than the second contact zone, a contact surface is provided, which, in the coupled condition, together with a contact surface at the female part of the then coupled floor panel, forms a support point which limits the movement of the male part in downward direction, wherein this support point is made as a floating support point; wherein at the male part, at a height lower than the second contact zone, a contact surface is provided, which, in the coupled condition, together with a contact surface at the female part of the then coupled floor panel, forms a support point which limits the movement of the male part in downward direction, wherein this support point is situated at the proximal half or substantially at the proximal half of the male part, whereas at the distal half of the male part no downwardly active support point of only a floating downwardly active support point is present at a lower side of the male part; wherein the male part, in the proximity of the proximal half thereof, extends deeper than in the proximity of the distal half thereof; wherein the horizontal distance between the middle of the first contact zone and the middle of the second contact zone is at least 3 millimeters.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) With the intention of better showing the characteristics of the invention, herein below, as an example without any limitative character, some preferred embodiments are described, with reference to the accompanying drawings, wherein:

(2) FIG. 1 schematically and in perspective represents a portion of a floor covering consisting of floor panels according to the invention;

(3) FIG. 2, at a larger scale, represents the portion indicated by F2 in FIG. 1;

(4) FIG. 3 in top plan view represents a floor panel from the floor covering of FIGS. 1 and 2,

(5) FIGS. 4 and 5, at a larger scale, represent cross-sections according to lines IV-IV and V-V, respectively, in FIG. 3;

(6) FIG. 6 represents the coupling parts, which are visible in FIG. 4, at a larger scale, wherein the contours of the coupling parts are drawn over each other, in other words are presented against each other in not-coupled condition at the height of the closing plane;

(7) FIG. 7 represents the coupling parts from FIG. 6 in the real coupled condition;

(8) FIGS. 8 to 10 represent some variants, wherein primarily the embodiments of FIGS. 9 and 10 are intended for MDF and HDF;

(9) FIG. 11 represents the groove side from FIGS. 8 and 9, however, rescaled to the same thickness and projected on top of each other.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

(10) As represented in FIGS. 1 and 2, the invention relates to floor panels 1 for forming a floor covering, which floor panels 1 comprise a first pair of opposite edges 2-3 and a second pair of opposite edges 4-5.

(11) The represented floor panels 1 are figured such at their edges that they are mutually coupleable according to the so-called fold-down principle, which is a principle known as such and which consists in that such floor panels 1 can be coupled to each other at the first pair of edges 2-3 by a turning movement R and at the second pair of edges 4-5 can be coupled to each other by a downward movement M, wherein the downward movement M is the result of the turning movement R and thus is effected substantially simultaneously. Herein, the floor panels 1 also are configured such at their edges 2-3 and 4-5 that finally a locking is effected in vertical direction V as well as in horizontal direction H, this latter perpendicular to the respective edges.

(12) As represented in FIGS. 3 to 7, such floor panel 1 to this aim at its first pair of edges 2-3 is provided with coupling parts 6-7, whereas at the second pair of edges coupling parts 8-9 are provided, which coupling parts will be described more detailed herein below, with reference to FIGS. 4 to 7.

(13) As can be seen in FIG. 5, the coupling parts 6-7 of the first pair of edges 2-3 show at least the following basic characteristics: the coupling parts 6-7 comprise a horizontally active locking system HL, which, in a coupled condition of two of such floor panels 1, effects a locking in the plane of the floor panels 1 and perpendicular to the respective edges 2-3; the coupling parts 6-7 also comprise a vertically active locking system, which, in a coupled condition of two of such floor panels 1, effects a locking transverse to the plane of the floor panels 1; the coupling parts 6-7 are substantially made of the material of the floor panel 1 itself; and the coupling parts 6-7 are configured such that two of such panels 1 can be coupled to each other at these edges by means of a turning movement R.

(14) As can be seen in FIGS. 4, 6 and 7, the coupling parts 8-9 of the second pair of opposite edges 4-5 show at least the following basic characteristics: the coupling parts 8-9 comprise a horizontally active locking system, which, in a coupled condition of two of such floor panels 1, effects a locking in the plane of the floor panels 1 and perpendicular to the respective edges 4-5; the coupling parts 8-9 also comprise a vertically active locking system, which, in a coupled condition of two of such floor panels 1, effects a locking transverse to the plane of the floor panels 1; the coupling parts 8-9 are substantially made of the material of the floor panel 1 itself; the horizontally active locking system of the second pair of edges 4-5 is formed at least of an upward-directed lower hook-shaped part 10, which is situated on one of said two edges 4, as well as a downward-directed upper hook-shaped part 11, which is situated on the opposite edge 5, wherein the lower hook-shaped part 10 consists of a lip 12 with an upward-directed locking element 13, which, proximally thereof, defines a female part 14 in the form of a recess, whereas the upper hook-shaped part 11 consists of a lip 15 with a downward-directed locking element 16 which forms a male part 17; the coupling parts 8-9 are configured such that two of such floor panels 1 can be coupled to each other at their respective edges 4-5 by means of a downward movement M of the one floor panel in respect to the other; the vertically active locking system of the second pair of edges 4-5 comprises vertically active locking parts 18-19-20-21, which, by means of respective contact surfaces 22-23-24-25, define at least a first contact zone C1 and a second contact zone C2, which are situated at opposite sides of the male part 17 and female part 14; the aforementioned vertically active locking parts comprise a first locking part 18 and a second locking part 19 at the respective opposite sides 26-27 of the male part 17, as well as a third locking part 20 and a fourth locking part 21 at the respective opposite sides 28-29 of the female part 14; in the coupled condition of two of such floor panels 1, the first and third locking parts 18 and 20 define said first contact zone C1, wherein they have contact surfaces 22 and 24 which, in the coupled condition, define at least one inclined tangent line T1; in the coupled condition of two of such floor panels 1, the second and fourth locking parts 19 and 21 define said second contact zone C2, wherein they have contact surfaces 23 and 25, which, in the coupled condition, also define at least one inclined tangent line T2; the aforementioned male part 17 has a distal side 27 and a proximal side 26, wherein the second locking part 19 is situated at the distal side 27; the aforementioned two tangent lines T1-T2 are upwardly inclined towards each other as from their respective contact zones C1-C2, by which is meant that both tangent lines, starting from their respective contact zone, are inclined in upward direction and in respect to the recess of the female part in inward direction, and thus the tangent lines are inclined in upward direction and in respect to a vertical are inclined in opposite directions; in respect to the plane of the floor panel 1, the tangent line T1 which is defined by the first and second locking parts 18 and 20 is steeper than the tangent line T2 which is defined by the second and fourth locking parts 19 and 21, or, in other words, the angle A1 of the first-mentioned tangent line T1 with the horizontal is larger than the angle A2 of the second-mentioned tangent line T2 with the horizontal; the difference in size between both mentioned angles A1-A2 is at least 5 degrees and preferably at least 10 degrees; and on the male part 17, at a height lower than the second contact zone C2, at least one contact surface 30A and/or 30B is provided, which, in the coupled condition, together with a contact surface 31A and/or 31B at the female part 14 of the then coupled floor panel, forms a support point 32A and/or 32B, which limits the movement of the male part 17 in downward direction.

(15) The particularity of the present invention consists in that at the second pair of edges 4-5 further one of the herein below defined characteristics I to VII is applied or a combination of two, three, four, five, six or all seven of these characteristics is present. The locations of the characteristics I to VI are indicated specifically in FIG. 7 by references I to VI, whereas the location of characteristic VII is indicated specifically in FIG. 9 by reference VII. Herein, this relates to the following characteristics: (I) the ratio between, on the one hand, the horizontal distance HM between the middle of the first contact zone C1 and the middle of the second contact zone C2 and, on the other hand, the vertical distance VM between the middle of the first contact zone C1 and the middle of the second contact zone C2, is more than 5 and still better more than 6; (II) at the male part 17, at a height lower than the second contact zone (C2), a contact surface 30A is provided, which, in the coupled condition, together with a contact surface 31A at the female part (14) of the then coupled floor panel, forms a support point 32A which limits the movement of the male part (17) in downward direction, wherein this support point 32A is made as a floating support point; (III) at the male part, at a height lower than the second contact zone C2, a contact surface 30B is provided, which, in the coupled condition, together with a contact surface 31B at the female part 14 of the then coupled floor panel, forms a support point 32B which limits the movement of the male part 17 in downward direction, wherein this support point is situated at the proximal half or substantially at the proximal half of the male part 17, whereas at the distal half of the male part 17 no downwardly active support point or only a floating downwardly active support point 32A is present at the lower side of the male part 17; (IV) at the lower side of the male part 17, two support points 32A and 32B are present, which in mutual respect are situated at a different height level, wherein the one is situated proximally from the other, and wherein the most proximal support point 32B of these two support points is situated lower than the other of the two support points; (V) the male part 17, in the proximity of the proximal half thereof, extends deeper than in the proximity of the distal half thereof; (VI) the horizontal distance HIM between the middle of the first contact zone (C1) and the middle of the second contact zone C2 is at least 3 millimeters; (VII) underneath the fourth locking part 21, by which is meant “lower” than this locking part, an incision 14A is present reaching proximally into the floor panel 1, which is cutting the lip 12 of the lower hook-shaped part free, wherein this incision 14A extends inward over a distance, which, measured from the vertical closing plane S, shows a horizontal depth which is at least 1/10 and still better at least 1/7 of the horizontal distance HIM between the middle of the first contact zone C1 and the middle of the second contact zone C2.

(16) These characteristics I to VII will be explained more specifically herein below.

(17) All six characteristics I to VI are applied in the embodiment of FIG. 7. However, this does not exclude that according to not represented variants only one of these characteristics or a limited number of these characteristics can be applied. It is emphasized again that any mathematically possible combination of two or more of the characteristics I to VII is an object of the invention.

(18) According to the first characteristic I, the ratio between the horizontal distance BM and the vertical distance VM between the middles of the contact zones, in other words, the ratio HM/VM, has to meet a requirement. The middles are indicated by marking lines ML. That the ratio HM/VM is greater than 5 and still better is greater than 6 implies that the male part 17 manifests itself relatively longitudinally extended in horizontal direction compared to the global shape of the coupling, that the height difference VM remains relatively small and that the lip 12 of the lower hook-shaped part 10, in relation to the global shape of the coupling, also is relatively long, considering that the length thereof is also determined by the distance HM. The aforementioned ratio provides for that the upward-directed locking part 13 can bend in a relatively smooth manner, even with relatively rigid material, such as MDF or HDF, and the male part 17 can be snapped home in the female part by means of a downward snap movement. At the same time, the relatively small height VM provides for that, with a horizontal traction force, the torque remains small and the coupling therein still offers sufficient resistance against undesired turning open as a result of bending.

(19) It is noted that in principle, by the “middles” of the contact zones each time the middle of the distance has to be understood over which, in cross-section, there is contact between the respective contact surfaces.

(20) According to the second characteristic II, between the male and female parts at least one support point is provided which is active in downward direction, in other words, limits the movement of the male part 17 in downward direction, wherein this support point according to the invention is realized as a floating support point. In FIG. 6, this relates to the support point 32A formed by contact surfaces 30A and 31A. Such floating support point provides for that the male part, at the location of this support point, can be pressed downward with certainty up to the entire depth or even can be pressed somewhat further downward. This has the advantage that the male part 17, amongst others, at the height of the second contact zone C2, can be smoothly brought with its respective locking part 19 up to underneath the respective locking part 21 of the female part 14 by exerting an additional downward force. In other words, hereby the snap effect is facilitated, while still a support point 32A is offered, which, with a large downward load on the floor panel, offers the necessary support at the location of the male part 17.

(21) According to the third characteristic III, at the male part 17 a downwardly active support point 32B is provided, which is situated in the proximal half or substantially in the proximal half of the male part 17, in other words, in FIG. 7 in the left half of the male part 17, while at the distal half of the male part 17, no downwardly active support point or only a floating downwardly active support point 32A is present at the lower side of the male part 17. In that at the distal half, no downwardly active support point or only a floating downwardly active support point 32A is present at the lower side of the male part 17, a particularly rigid support in the distal half is excluded, by which the first-mentioned support point 32B then unhampered can be configured as a support point in an optimum manner. In that the first-mentioned support point is situated in the proximity of the end of the lip 12 of the lower hook-shaped part 10, an elastic support can be provided.

(22) According to the fourth characteristic IV, two support points are present at the lower side of the male part 17, wherein the support point, which is most proximal in respect to the male part 17, is situated lower than the other of the two support points. Herein, one or both of the support points may or may not be realized as floating support points. The fact that the most distal support point at the male part is situated higher, offers the advantage that the lower hook-shaped part can be realized relatively thick in the proximity of its proximal end and a little movable support point, with the exception of a possible floating effect, is offered. The fact that the most proximal support point of the male part is situated lower, implies that the lip of the lower hook-shaped part becomes thinner and thus more flexible towards its distal end, which allows a smooth joining. Also, hereby the possibility is created to work with a larger engagement height between the lower hook-shaped part and the upper hook-shaped part. In the example of FIG. 7, this relates to the support points 32A and 32B, wherein the support point 32B is situated considerably lower than the support point 32A.

(23) It is noted that in FIG. 7 two support points 32A and 32B are present, however, that according to variants, in function of the applied characteristic, embodiments with only one support point are possible, too. The term “support point” means a location where there is contact or can be made. This can be a local point, as well as a zone extending in the cross-section of the respective edge over a distance.

(24) According to the fifth characteristic V, the male part 17, next to the proximal half thereof, extends deeper than next to the distal half thereof, this independently from the fact whether there are support points in downward direction or not. This characteristic implies that the lip 12 of the lower hook-shaped part becomes thinner and thus more flexible towards its distal end, which allows a smooth joining. Hereby, also the possibility is created of working with a larger engagement height between the lower hook-shaped part 10 and the upper hook-shaped part 11.

(25) According to the sixth characteristic VI, the horizontal distance BM between the middle of the first contact zone C1 and the second contact zone C2 is at least 3 mm. This comparatively large distance implies that the lower hook-shaped part 10 is relatively long, too. The inventor has found that such minimal horizontal distance offers good results primarily with coupling parts which are realized from MDF or HDF, more particularly in one piece from an MDF substrate or HDF substrate. It was found that the coupling parts then can be smoothly snapped into each other by a downward movement, while still sufficient vertical locking is obtained. Also, by this length the risk is reduced that the male part breaks off due to sliding off in the MDF or HDF.

(26) The incision 14A according to the seventh characteristic VII, an example of which is given in FIG. 9, offers the advantage that the lip of the lower hook-shaped part 10 as such becomes comparatively long and flexible, while the horizontal distance BM between the middles of the contact zones C1 and C2 is less dependent thereon.

(27) In general, the floor panel 1 preferably is composed of a substrate, in the example indicated by reference 52, and at least a decorative top layer 52. Further, at the lower side a not-represented counter layer or balancing layer can be provided, which can have the purpose of preventing the warping of the floor panel.

(28) As represented in the figures, the coupling parts preferably are made in one piece from the panel material, and more particularly from the material of the substrate 52, which preferably is valid for the coupling parts 6-7 of the first pair of edges 2-3 as well as for the coupling parts 8-9 of the second pair of edges 4-5.

(29) It is noted that the substrate 52 as such can be made monolithic, thus, consisting of a single board of a certain material, as well as can be composed of different layers and/or parts.

(30) In the represented embodiment of FIGS. 1 to 5, the substrate 52 consists of a single board, for example, of MDF (Medium Density Fiberboard) or HDF (High Density Fiberboard). The decorative top layer 57 can consist of any material. A number of examples are described in the introduction. In the case of MDF- or HDF-based laminate panels, the top layer preferably consists of DPL (Direct Pressure Laminate), which, as known, mostly consists of a number of resinated paper layers, which are pressed on the substrate and consolidated, amongst which a paper which is provided with a printed decor.

(31) It is noted that such top layer 57 can also consist of a lacquer layer and/or print provided directly on the substrate, which means that the top layer 57 does not necessarily have to consist of a previously produced material layer.

(32) In FIGS. 4-7, the top layer 57 is represented relatively thick. It is clear that this is schematic and that in the case of, for example, DPL or lacquer or the like, this will be a particularly thin top layer.

(33) As can be seen in FIGS. 4, 6 and 7, in the represented example the lower hook-shaped part 10, at the distal side 33 of its distal end 34, is free from mechanical vertically active locking parts. More particularly, in coupled condition a space 55 is present behind the distal end 34 of the lower hook-shaped part 10. As represented, it is also preferred that in the coupled condition a space 56 is present above the upward-directed locking element 13, which space is made continuous with the aforementioned space 55. Hereby is achieved that the locking element 13 is freely movable and cannot be hindered in its working by surrounding material parts.

(34) As explained in the introduction, according to an alternative embodiment indeed a mechanical vertical locking part can be provided at the distal side 33. Both systems, thus, with or without locking part at the distal side 33, each, as explained herein above, have their own advantages.

(35) FIG. 7 also shows the characteristic that the two contact surfaces of the second contact zone C2, including possible prolongations thereof, viewed in cross-section, extend to the left as well as to the right of the respective closing plane S, wherein the closing plane is defined as a vertical plane through the upper edges 41-42 of the coupled floor panels or at least the location where the floor panels come together at the top.

(36) Still another characteristic mentioned earlier, which is applied in the embodiment of FIG. 7, consists in that at the lower side of the lip 12 of the lower hook-shaped part 10 a recess 45 extending up to the distal end of the lip is present, which recess allows a downward bending of the lip, or at least of a portion thereof, wherein preferably the recess is configured such that said downward bending substantially provides for a tilting movement of the upward-directed locking element 13. The tilting movement is clearly visible when comparing FIGS. 6 and 7 to each other.

(37) As represented, it is preferred that at the lower edges of the male part 17 guiding surfaces 48-49, such as chamfers or roundings, are present, which are configured such that the male part, during the downward movement thereof, automatically is led into the female part, on which the necessary guiding surfaces can be present as well, and that the male part therein always comes to sit with at least the lower portion in the female part before an apart-pushing force is created as a result of the locking parts of the second contact zone initially moving along each other.

(38) Preferably, the tangent line T1 in the first contact zone C1 forms an angle A1 with the horizontal of at least 75 degrees and still better at least 80 degrees and preferably in the order of magnitude of 85 degrees or more.

(39) The tangent line T2 in the second contact zone C2 preferably forms an angle A2 with the horizontal of less than 50 degrees and still better less than 45 degrees and still better less than 30 degrees, all this preferably in combination with the angle values for the tangent line of the first contact zone described in the preceding paragraph.

(40) As aforementioned, the coupling parts at the second pair of edges are configured such that they, in coupled condition, create a so-called pretension. In the represented embodiment, this takes place in that the locking part 13, as a result of the tilting movement, wants to bend back elastically, by which the coupled floor panels are tensioned towards each other.

(41) The contours of the coupling parts in FIG. 6, which coupling parts are not coupled in this figure, on the one hand, and the coupled condition of FIG. 7, on the other hand, also illustrate the characteristic according to which the upward-directed locking element 13, the downward-directed locking element 16 and the pertaining contact surfaces of the first contact zone C1 are configured such that the upward-directed locking element 13 with its pertaining contact surface, in the coupled condition, adopts a somewhat tilted position in respect to the position adopted by this contact surface in the free condition; and according to which both contact surfaces of the first contact zone, in the not coupled condition, mutually are oriented such that in the coupled condition mutually a less deviating or not deviating orientation is obtained. As represented in FIG. 7, it is preferred that the contact surfaces of the first contact zone in the coupled condition coincide with each other or approximately coincide with each other.

(42) In FIG. 6 can be seen that the aforementioned contact surfaces, when for their free condition the contours thereof are projected over each other, approach in downward direction or, in other words, provide for a diminishing overlap in downward direction. Herein, the respective contact surfaces show an angular difference Z of preferably 2 to 10 degrees. As an example, the contact surface 22 in FIG. 6 forms an angle with the horizontal of 85.00°, while the contact surface 24 forms an angle with the horizontal of 79.92°.

(43) A number of other subordinate characteristics, which are visualized in the embodiment of, amongst others, FIG. 7, are as follows: the center point of the second contact zone C2 is situated higher than the center point of the first contact zone C1; the second contact zone C2 is a local contact zone, by which is meant that it does not extend over the entire height of the male part; more particularly, this contact zone is situated with its upper end at a distance from the upper side of the floor panel and is situated with its lower end at a distance above the lower end of the male part; more particularly, it is preferred that the second contact zone, seen in the height, is situated between ¼ and ¾ of the overall height of the male part, in other words, the vertical height measured between the lowermost point of the male part and the upper side of the floor panel; the distal end of the upper hook-shaped part is entirely free from downwardly active support points above the aforementioned second contact zone C2.

(44) It is noted that the aforementioned vertically active locking system VL and horizontally active locking system HL of the first pair of edges 2-3 can be installed in any manner. Preferably, however, to this aim, as represented in FIG. 5, for the vertically active locking system VL use shall be made of a tongue 58 and a groove 59, which groove preferably is bordered by a lower lip 60 and an upper lip 61. For the horizontally active locking system, use is made of locking parts 62 and 63 provided at the tongue and the groove, which locking parts, in coupled condition, engage one behind the other. Herein, it is preferred that the lower lip 60 distally reaches up to beyond the upper lip 61 and that the locking part 63 also comprises a locking surface 64, which is situated to beyond the distal end of the upper lip 61.

(45) It is noted that coupling parts of one and the same dimension can be applied in various thicknesses of floor panels, this while the characteristics of the invention still remain applicable. This is illustrated in FIG. 6, wherein the floor panel is represented with a thickness TH1, however, alternatively can be realized with another thickness TH2 while maintaining the same coupling profile. By way of example only, the thickness TH1 may be 4 mm and the thickness TH2 6.5 mm.

(46) FIGS. 8 to 10 represent, by way of example, three embodiments of the invention with mutually somewhat varied profile forms for the coupling parts. FIG. 11, for the sake of comparison, represents the groove sides of FIGS. 8 and 9, however, rescaled to the same thickness and projected one above the other. In view of the large ratio HM/VM, the embodiments of FIGS. 9 and 10 are particularly suitable for embodiments in MDF or HDF.

(47) The present invention is in no way limited to the embodiments described by way of example and represented in the figures, on the contrary may such panel and in particular floor panel of the invention be realized in various forms and dimensions, without leaving the scope of the invention.