FLOOR PANELS AND METHOD FOR PRODUCING FLOOR PANELS AND CUTTING TOOLS USED THEREIN

Abstract

Floor panels have coupling parts in the form of a tongue and groove with locking surfaces. In a coupled state of two such panels, an open space is present, viewed vertically, between the tongue and the lower lip, and viewed horizontally, between the contact zone and the contact between the horizontally active locking surfaces. The underside of the tongue in the open space comprises a first face. The top side of the lower lip in the open space comprises a second face parallel to the first face. In the coupled state of two such panels, at least one face is perpendicular to the panel and intersects both the first face of the first coupled panel and the second plane of the panel coupled to the first panel.

Claims

1. A set of floor panels wherein the floor panels have coupling parts on a first pair of opposite sides, wherein the coupling parts of a first floor panel of said set of floor panels are arranged to couple to coupling parts of a second floor panel of said set of floor panels at a first pair of opposite sides, and establish both a lock in a vertical direction perpendicular to a plane of the floor panels and a lock in a horizontal direction perpendicular to the respective sides and in the plane of the floor panels, wherein the lock in the vertical direction is achieved using a tongue and groove connection, wherein said groove is delimited by a lower lip and an upper lip, wherein in order to achieve the lock in the horizontal direction, the coupling parts are provided with locking parts in a form of a recess in the lower lip and a protrusion cooperating therewith on an underside of the tongue, forming at least horizontally active locking surfaces, wherein a locking surface is formed on flanks of said recess and is situated in a part of the lower lip extending past the upper lip, wherein the floor panel is configured such that in the coupled state of the first and second panels at the first pair of opposite sides, an open space is present, viewed vertically, between the tongue and the lower lip, wherein the underside of the tongue in the open space has a first face, a second face proximally from and adjacent to the first face, and a third face distally from and adjacent to the first face; wherein, viewed from a distal direction to a proximal direction of the panel, both the third face and the second face are oriented downwards; wherein the first face is parallel to the plane of the panel; wherein the side of the first pair of opposite sides containing the tongue comprises a first closing face, and the side of the first pair of opposite sides containing the groove comprises a second closing face at a distal end of the upper lip, wherein in coupled state of the first and second panels at the first pair of opposite sides, there is contact between the first closing face and the second closing face of the coupled panels, wherein extension of the first closing face intersects the third face and the first face is situated completely proximally to this extension of the first closing face.

2. The set of floor panels according to claim 1, wherein the angle between the third face and the second face is less than 3.

3. The set of floor panels according to claim 2, wherein the third face and the second face are parallel to one another.

4. The set of floor panels according to claim 1, wherein in the coupled state of two such panels at their first pair of opposite sides, a contact zone is formed between the underside of the tongue and the lower lip, wherein said contact zone, considered for the floor panel coupled at the tongue, extends distally from the first closing face, and wherein said open space is present, viewed horizontally, between the contact zone and the contact between the horizontally active locking surfaces.

5. The set of floor panels according to claim 4, wherein in coupled state of the first and second panels at the first pair of opposite sides, a second contact zone is formed between the lower edge of the tongue and the upper edge of the lower lip, wherein the second contact zone, considered for the floor panel coupled at the groove, is distally positioned with respect to the first face.

6. The set of floor panels according to claim 5, wherein the second contact zone, considered for the floor panel coupled at the groove, is proximally positioned with respect to the contact between the horizontally active locking surfaces and/or wherein the second contact zone extends continuously in the contact between the horizontally active locking surfaces.

7. The set of floor panels according to claim 1, wherein in the coupled state at the first pair of opposite sides, a pretension is present between the horizontally active locking surfaces, due to a bending of the lower lip.

8. The set of floor panels according to claim 1, wherein the first and second floor panel are arranged to be coupled at the first pair of opposite sides by an angling movement of the first panel parallel to the first pair of opposite sides, with the tongue in the groove of the second panel.

9. The set of floor panels according to claim 1, wherein the first face is situated distally from the lowest point of the lower edge of the tongue.

10. The set of floor panels according to claim 1, wherein the floor panel contains a substrate, wherein the substrate comprises one or more of: a wood-based substrate, including one or more wood layers, a chipboard or a fibreboard; a synthetic substrate, wherein the synthetic substrate comprises a polymer matrix and optional fillers, wherein the polymer of the polymer matrix consists polyvinyl chloride, polyurethane or polypropylene, wherein the optional fillers comprise one or more mineral fillers or wood-based fillers a mineral substrate selected from a group consisting a magnesium oxide board, a gypsum board, a fibre cement board, and a mineral fibre board wherein mineral fibres are bonded together by means of a resin.

11. The set of floor panels according to claim 1, wherein the upper side of the lower lip in the open space has a fourth face, a fifth face distally from and adjacent to the fourth face, and a sixth face proximally from and adjacent to the first face; wherein, viewed from a distal direction to a proximal direction of the panel, both the fifth face and the sixth face are oriented upwards; wherein the fourth face is parallel to the plane of the panel.

12. The set of floor panels according to claim 1, wherein the fifth face and the sixth face are parallel to one another.

13. A method for producing sets of floor panels, wherein a first set of floor panels is produced with a first thickness, wherein a second set of floor panels is produced with a second thickness, wherein the first and second set of floor panels are sets of floor panels according to claim 1.

14. The method for producing sets of floor panels according to claim 13, wherein the first face of a floor panel of the first set of floor panels and the first face of a floor panel of the second set of floor panels are formed by a same cutting tool and/or wherein a distal end of the tongue of a floor panel of the first set of floor panels and a distal end of the tongue of a floor panel of the second set of floor panels are formed by the same cutting tool, wherein the cutting tool also forms the said third faces and/or wherein the locking surface situated on the flanks of the recess of a floor panel of the first set of floor panels, and the locking surface situated on the flanks of the recess of a floor panel of the second set of floor panels, are formed by the same cutting tool.

15. The method for producing sets of floor panels according to claim 13, wherein the difference in thickness between the panels of the first set of floor panels and the panels of the second set of floor panels is at least 2 millimeters, and/or wherein the panels of the first set of floor panels are thicker than the panels of the second set of floor panels, and wherein the lower lip of the panels of the first set of floor panels protrudes over a greater distance relative to the upper lip than is the case for the panels of the second set of floor panels and/or wherein the panels of the first set of floor panels are thicker than the panels of the second set of floor panels, wherein the deepest point of the recess in the lower lip of the panels of the first set of floor panels lies at a greater distance from the lower edge of the panel than in the panels of the second set of floor panels.

16. The method for producing sets of floor panels according to claim 13, wherein the first face is formed by a first cutting tool and wherein a distal end of the tongue is formed by a second cutting tool.

17. A cutting tool for use in a method according to claim 13 and/or for a production of a floor panel, wherein the cutting tool is configured for producing the first face.

18. The cutting tool according to claim 17. wherein the cutting tool is a milling cutter.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Further features may appear from the following examples. With the aim of presenting the features of the invention better, some preferential embodiments are described below as examples without limitative character, with reference to the appended drawings in which:

[0062] FIG. 1 shows a floor covering consisting of panels according to the invention;

[0063] FIG. 2 shows a top view of a panel used in the floor covering of FIG. 1;

[0064] FIG. 3 shows the panel from FIG. 2 along line III-III of FIG. 2;

[0065] FIG. 4 shows two panels according to FIGS. 2 and 3, in coupled state;

[0066] FIGS. 5 and 8 show panels according to the invention in the same view as FIG. 3;

[0067] FIG. 6 shows the panels according to FIGS. 2 and 5;

[0068] FIGS. 7a and 7b show steps in the production of the coupling parts of the panel from FIG. 3;

[0069] FIGS. 9a through 9c show the differences in the tools used for the production of the coupling parts of the panels shown in FIGS. 3 and 8.

DETAILED DESCRIPTION OF VARIOUS EMBODIMENTS

[0070] FIG. 1 shows a floor covering consisting of panels 1 according to the invention; FIG. 2 shows a top view of a panel used in the floor covering of FIG. 1. The panels I have coupling parts on at least one pair of opposite sides 2, 3. In the example, the panels are rectangular and elongate, and they also have coupling parts on their second pair of opposite sides 4, 5.

[0071] The panels 1 are provided with coupling parts on their first pair of opposite sides, so that these panels can be coupled together at their first pair of opposite sides by means of a angling movement W.

[0072] FIG. 3 shows the floor panel 1 from FIG. 2 along line III-III of FIG. 2. The panel has a thickness T1, in this example the thickness T1 is 7 mm. FIG. 4 shows two panels according to FIGS. 2 and 3 in the state coupled together at the first pair of opposite sides. This floor panel 1 has coupling parts 6 on a first pair of opposite sides 2, 3. When two such floor panels 1 are coupled together at their first pair of opposite sides 2, 3, the coupling parts 6 establish both a lock in the vertical direction V1 perpendicular to the plane of the floor panels 1 and a lock in the horizontal direction H1 perpendicular to the respective sides 2, 3 and in the plane of the floor panels 1. The lock in the vertical direction V1 is achieved using a tongue and groove connection 9, 10, wherein said groove 10 is delimited by a lower lip 11 and an upper lip 12. In order to achieve the lock in the horizontal direction H1, the coupling parts 6 are provided with locking parts in the form of a recess 14 in the lower lip 11 and a protrusion 15 cooperating therewith on the underside of the tongue 9, which when two such floor panels 1 are coupled together, form at least horizontally active locking surfaces 16, 17, wherein the locking surface 17 which is formed on the flanks of said recess 14 is situated in a part of the lower lip 11 which extends past the upper lip 12. In the coupled state of two such panels at their first pair of opposite sides 2, 3, a contact zone 20 is formed between the underside of the tongue 9 and the lower lip 11.

[0073] The floor panel 1 is configured such that in the coupled state of two such panels at their first pair of opposite sides 2, 3, an open space 22 is present, viewed vertically, between the tongue 9 and the lower lip 11, and viewed horizontally, between the contact zone and the contact between the horizontally active locking surfaces 16, 17. The underside of the tongue 9 in the open space comprises a first face 24. The top side of the lower lip 11 in the open space comprises a second face 25. In the example shown in FIGS. 2 and 3, the first face 24 is parallel to the second face 25, and the first face 24 and the second face 25 are parallel to the plane of the panel. In coupled state of a first such panel 1 with its tongue 9 in the groove 10 of a second such panel, at least one face 26 perpendicular to the coupled panels and parallel to the first pair of opposite sides 2, 3 intersects both the first face 24 of the first coupled panel and the second face 25 of the second panel.

[0074] In the example, in the open space 22, the lower edge of the tongue 9 comprises a third face 27 distally from the first face 24, wherein the third face 27 makes a greater angle with the plane of the panel than the first face 24.

[0075] In the example, in the open space 22, the lower edge of the tongue 9 comprises a fourth face 28 proximally to the first face 24, wherein the fourth face 28 makes a greater angle with the plane of the panel than the first face 24.

[0076] Viewed from the distal direction to the proximal direction of the panel, both the third face 27 and the fourth face 28 are oriented towards the lower edge of the panel.

[0077] In the example, in the open space 22, the upper edge of the lower lip 11 comprises a fifth face 31 distally from the second face 25, wherein the fifth face 31 makes a greater angle with the plane of the panel than the second face 25.

[0078] In the example, in the open space 22, the upper edge of the lower lip 11 comprises a sixth face 32 proximally to the second face 25, wherein the sixth face 32 makes a greater angle with the plane of the panel than the second face 25.

[0079] Viewed from the distal direction to the proximal direction of the panel, both the fifth face 31 and the sixth face 32 are oriented towards the upper edge of the panel.

[0080] In the example, the third face 27 and the fourth face 28 are parallel to one another.

[0081] The side 2 containing the tongue 9 comprises a first closing face 29. The side 3 containing the groove 10 comprises a second closing face 30 at the distal end of the upper lip 12.

[0082] In coupled state of two such panels at their first pair of opposite sides 2, 3, contact is present between the first closing face 29 and the second closing face 30 of the coupled panels 1. The extension 34 of the first closing face 29 intersects the third face 27. The extension 33 of the second closing face intersects the sixth face 32. The first face 24 is situated completely proximally to the first closing face 34.

[0083] The fifth face 31 makes a greater angle with the plane of the panel than the sixth face 32. In the example of FIGS. 3 and 4, the difference between the angle of the fifth face with the plane of the panel and the angle of the sixth face with the plane of the panel is 11.

[0084] In the example, in coupled state of two such panels at their first pair of opposite sides 2, 3, a second contact zone 36 is formed between the lower edge of the tongue 9 and the upper edge of the lower lip 11, wherein the second contact zone 36 is distally positioned with respect to the second face 25.

[0085] The second contact zone 36-considered for the floor panel coupled at its groove 10is proximally positioned with respect to the contact between the horizontally active locking surfaces 16, 17. The second contact zone 36 extends continuously in the contact between the horizontally active locking surfaces 16, 17.

[0086] The first face 24 is situated distally from the lowest point 38 of the lower edge of the tongue 9.

[0087] In the coupled state of two such panels at their first pair of opposite sides 2, 3, a pretension is present between the horizontally active locking surfaces 16, 17 due to a bending of the lower lip 11. This bending is created by overlapping of the profiles. FIG. 4 shows the panels with the overlap, but not with the bend (and pretension) which occurs during coupling.

[0088] Two such panels can be coupled at their first pair of opposite sides 2, 3 by means of a angling movement W (see FIG. 1) of such a panel parallel to its first pair of opposite sides 2, 3, with its tongue 9 in the groove 10 of the second such panel.

[0089] The panel 1 shown in FIGS. 3 and 4 has chamfers in the form of sloping edges 61 at its first pair of opposite sides 2, 3.

[0090] FIG. 5 shows another example of a floor panel according to the invention in the same view as FIG. 3. The panel has a thickness T2 equal to 8 mm, and is thus thicker than the panel shown in FIGS. 3 and 4. The reference signs in FIG. 5 have the same meaning as the corresponding reference signs in FIG. 3.

[0091] The first face 24 of the floor panel of FIG. 3 is parallel to the first face of the floor panel of FIG. 5. The second face of the floor panel of FIG. 3 is parallel to the second face 25 of the floor panel of FIG. 5.

[0092] FIG. 6on the same scaleshows the panel 40 (with thickness T1=7 mm) of FIG. 3 together with the panel 41 (with thickness T2=8 mm) of FIG. 5. The tongue and groove of both these panels are produced with the same cutting tools. The lower lip of the thicker floor panel 41 protrudes over a greater distance relative to its upper lip than is the case with the thinner floor panel 40. The deepest point 39 of the recess in the lower lip 11 of the thicker floor panel 41 lies at a greater distance from the lower edge of the panel than in the thinner floor panel 40. The difference in distance between the lower edge of the panel and the deepest point 39 of the recess 14 in the lower lip 11, between the thicker floor panel 41 and the thinner floor panel, is smaller than the difference in thickness between the two floor panels.

[0093] FIGS. 7a and 7b show, as an example of the method according to the invention, steps in the production of coupling parts of the panel in FIG. 3. A standard continuous milling machine with several milling cutters on two edges is used to form the coupling parts on both sides of the pair of opposite sides 2, 3 simultaneously. The coupling parts are produced by means of a number of milling operations using cutting tools, more specifically milling cutters. FIGS. 7a and 7b do not show all steps, but only those in which the tongue 9 and the groove 10 are formed. The profiles of the coupling parts shown in FIGS. 7a and 7b are those of the final coupling parts of the panel.

[0094] FIG. 7a shows a step in forming the tongue and groove. Cutting tool 52 forms the distal end of the tongue 9 and also the third face 27 of the floor panel 1.

[0095] Cutting tool 51A forms the second face 25 and the sixth face 32 of the panel, and the proximal end of the groove 10.

[0096] The next steps in forming the tongue and groove are shown in FIG. 7b. Cutting tool 54 forms the first face 24 and the fourth face 28. Cutting tool 53 forms the fifth face 31 and also the locking surface 17 situated on the flanks of the recess 14 of the lower lip 11.

[0097] The coupling parts of the panel in FIG. 5 are formed with the same design of the four cutting tools 51A, 52, 53 and 54. Only the relative position of these cutting tools with respect to the panel concerned is modified.

[0098] FIG. 8 shows another example of a floor panel according to the invention in the same view as FIG. 3. The panel has a thickness T3 equal to 10 mm, and is thus thicker than the panels shown in FIGS. 3 and 5. The reference signs in FIG. 8 have the same meaning as the corresponding reference signs in FIG. 3.

[0099] The first face 24 of the floor panel of FIG. 3 is parallel to the first face 24 of the floor panel of FIG. 8. The second face 25 of the floor panel of FIG. 3 is parallel to the second face 25 of the floor panel of FIG. 8.

[0100] Three of the four cutting tools shown in FIGS. 7a and 7b for forming the tongue and groove of the panels in FIGS. 3 and 5 are also used for forming the tongue and groove of the panel in FIG. 8. These are the tools 52, 53 and 54.

[0101] Tool 51A in FIG. 7a, used for producing part of the groove of the panels in FIGS. 3 and 5, is replaced by suitable tool. Tool 51A, used for producing part of the groove of the panel in FIG. 3, is shown in FIG. 9a, while the suitable tool 51B used for producing part of the groove of the panel in FIG. 8, is shown in FIG. 9c. FIG. 9b shows both tools 51A and 51B.