AU2014200573A1 - Floor covering, consisting of hard floor panels and method for manufacturing such floor panels - Google Patents

Abstract

The invention relates to a floor covering, consisting of hard floor panels which, at least at the edges of two opposite sides, are provided with coupling parts, cooperating which each other, substantially in the form of a tongue and a groove, characterized in that the coupling parts are provided with integrated mechanical locking means which prevent the drifting apart of two coupled floor panels into a direction perpendicular to the related edges and parallel to the underside of the coupled floor panels. Hereby, these coupling parts are optimized in such a manner that they allow that any form of play is counteracted and preferably is excluded.

Description

WO 97/47834 PCT/EP97/03006 1 Floor covering, consisting of hard floor panels and method for manufacturing such floor panels. 5 This invention relates to a floor covering, consisting of hard floor panels, as well as to a method for manufacturing such floor panels. In first instance, the invention is intended for so 10 called laminated floors, but generally it can also be applied for other kinds of floor covering, consisting of hard floor panels, such as veneer parquet, prefabricated parquet, or other floor panels which can be compared to laminated floor. 15 It is known that such floor panels can be applied in various ways. According to a first possibility, the floor panels are 20 attached at the underlying floor, either by glueing or by nailing them on. This technique has as a disadvantage that it is rather complicated and that subsequent changes can only be made by breaking out the floor panels. 25 According to a second possibility, the floor panels are installed loosely onto the underground, whereby the floor panels mutually match into each other by means of a tongue and groove coupling, whereby mostly they are glued together in the tongue and groove, too. The floor 30 obtained in this manner, also called a floating parquet flooring, has as an advantage that it is easy to install and that the complete floor surface can move which often is convenient in order to receive possible expansion and shrinkage phenomena. 35 A disadvantage with a floor covering of the above- WO 97/47834 PCT/EP97/03006 2 mentioned type, above all, if the floor panels are installed loosely onto the underground, consists in that during the expansion of the floor and its. subsequent shrinkage, the floor panels themselves can drift apart, 5 as a result of which undesired joints can be formed, for example, if the glue connection breaks. In order to remedy this disadvantage, techniques have already been thought of whereby connection elements made 10 of metal are provided between the single floor panels in order to keep them together. Such connection elements, however, are rather expensive in manufacturing them and, furthermore, their provision or the installation thereof is a time-consuming occupation. 15 Examples of embodiments which apply such metal connection elements are described, among others, in the documents WO 94/26999 and WO 93/13280. 20 Furthermore, couplings are known which allow to snap floor parts into each other, a.o. from the documents WO 94/1628, WO 96/27719 and WO 96/27721. The snapping together effect obtained with these forms of embodiment, however, does not guarantee a 100-percent optimum 25 counteraction against the development of gaps between the floor panels, more particularly, because in fact well defined plays have to be provided in order to be sure that the snapping-together is possible. 30 From GB 424.057, a coupling for parquetry parts is known which, in consideration of the nature of the coupling, only is appropriate for massive wooden parquetry. Furthermore, there are also couplings for panels known 35 from the documents GB 2.117.813, GB 2.256.023 and DE 3.544.845. These couplings, however, are not appropriate WO 97/47834 PCT/EP97/03006 3 for connecting floor panels. The invention aims at an improved floor covering of the aforementioned type, the floor panels of which can be 5 coupled to each other in an optimum manner and/or the floor panels of which can be manufactured in a smooth manner, and whereby preferably one or more of the aforementioned disadvantages are excluded. 10 The invention also aims at a floor covering which shows the advantage that no mistakes during installing, such as gaps and such, can be created. Furthermore, the invention also aims at a floor covering 15 whereby the subsequent development of gaps is excluded or at least counteracted in an optimum manner, whereby also the possibility of the penetration of dirt and humidity is minimalized. 20 To this aim, the invention relates to a floor covering, consisting of hard floor panels which, at least at the edges of two opposite sides, are provided with coupling parts, cooperating which each other, substantially in the form of a tongue and a groove, characterized in that the 25 coupling parts are provided with integrated mechanical locking means which prevent the drifting apart of two coupled floor panels into a direction perpendicular to the related edges and parallel to the underside of the coupled floor panels. Hereby, these coupling parts are 30 optimalized in such a manner that they allow that any form of play is counteracted and preferably is excluded. By integrated mechanical locking means is understood that these form a fixed part of the floor panels, either by 35 being connected in a fixed manner to the floor panels, or by being formed in one piece herewith.

WO 97/47834 PCTIEP97/03006 4 In a first important preferred form of embodiment, the coupling parts are provided with locking means which, in the engaged position of two or more of such floor panels, exert a tension force upon each other which force the 5 floor panels towards each other. As a result of this is effected that not only during installing the formation of gaps is counteracted, but also in a later stage the development of gaps, as a result of which causes whatsoever, is counteracted. 10 According to another characteristic of the invention, the coupling parts, hereby, are realized in one piece with the core of the floor panels. 15 According to a second important preferred form of embodiment, the aforementioned optimalization consists in that the floor covering shows the following combination of characteristics: that the coupling parts and locking means are realized in one piece with the core of the 20 floor panels; that the coupling parts have such a shape that two subsequent floor panels can be engaged into each other exclusively by snapping together and/or turning, whereby each subsequent floor panel can be inserted laterally into the previous; that the coupling parts 25 provide in an interlocking, free from play, according to all directions in the plane which is situated perpendicular to the aforementioned edges; that the possible difference between the upper and lower lip of the lips which border the aforementioned groove, measured 30 in the plane of the floor panel and perpendicular to the longitudinal direction of the groove, is smaller than one time the total thickness; that the total thickness of each related floor panel is larger than or equal to 5 mm; and that the basic material of the floor panels, of 35 which the aforementioned core and locking means are formed, consists of a ground product which, by means of a WO 97/47834 PCT/EP97/03006 5 binding agent or by means of melting together, is composed to a single compound, and/or of a product on the basis of synthetic material and/or of a chip board with fine chips. 5 Due to the fact that the coupling parts provide for an interlocking free from play, as well as due to the fact that these coupling parts are manufactured in one piece, from the basic material of the floor panels, a perfect 10 connection between adjacent floor panels can always be guaranteed, even with repeated expansion and shrinkage of the floor surface. This combination of characteristics can be combined or 15 not with the aforementioned characteristic which states that the locking means exert a tension force upon each other. According to a third important preferred form of 20 embodiment, the characteristics of which may or may not be combined with the characteristics of the embodiments described above, the floor covering is characterized in that the lower lip which limits the lower side of the groove, extends beyond the upper lip; that the locking 25 means are formed at least of a portion which inwardly slopes downward; and that this portion, at least partially, is located in the portion of the lower lip which extends beyond the upper lip. The advantages of these features will appear from the further description. 30 According to a preferred form of embodiment, the floor panels consist of elongated panels and the coupling parts described above are applied along the longitudinal sides of these panels. 35 According to a particular form of embodiment, coupling WO 97/47834 PCTIEP97/03006 6 parts are provided at the other two sides, too, either of another construction than described above or not. In the most preferred form of embodiment, for the basic 5 material use shall be made of the aforementioned product, which, as said, is ground and, by means of a binding agent, composed to a single compound. More particularly, for the core use shall be made of finely-ground wood which preferably is glued, more particularly, watertight 10 glued. Still more particularly, for the core use shall be made of so-called HDF board (High Density Fibreboard) or MDF board (Medium Density Fibreboard). The fact that the invention is applied to floor panels 15 the basic material of which consists of the material described above, offers the advantage that with the processing of this material, very smooth surfaces are obtained whereby very precise couplings can be realized, which, in first instance, is important in the case of a 20 snap-together connection and/or turning connection free from play. Also, very special forms of coupling parts can be manufactured in a very simple manner because the aforementioned kinds of material can be processed particularly easy. 25 The surfaces obtained with HDF and MDF also have the advantage that the floor panels mutually can fluently be shifted alongside each other in interlocked condition, even when engaged with a tensioning force. 30 The inventor also found out that the aforementioned materials, in particular HDF and MDF, show ideal features in order to realize a connection, such as mentioned above, as these materials show the right features in 35 respect to elastic deformation in order to, on one hand, realize a snap-together effect, and, on the other hand, WO 97/47834 PCTIEP97/03006 7 receive expansion and shrinkage forces in an elastic manner, whereby it is avoided that the floor panels come unlocked or are damaged in an irreparable manner. 5 In the case that for the core use is made of a material based on synthetic material, to this end solid synthetic material can be used as well as a mixture of synthetic materials, eventually composed of recycled materials. 10 The floor covering preferably is formed by joining the floor panels into each other free of glue. Hereby, the connections are of such nature that the floor panels can be disassembled without being damaged, such that, for example, when moving, they can be taken along in order to 15 be placed again. It is, however, clear that a glueing between tongue and groove is not excluded. The invention, of course, also relates to floor panels which allow the realization of the aforementioned floor 20 covering. The invention also relates to a method for the manufacturing of the aforementioned floor panels which shows the advantage that the tongues and/or grooves, 25 including the corresponding locking means, can be provided at the floor panels at high production speeds without problems. More particularly, it aims at a method which allows that the rather complicated forms of the tongue and the groove of the aforementioned floor panels 30 can be realized completely by means of milling cutters, the diameter of which can be chosen independently of the form to be realized, such that the use of small milling cutters, for example finger cutters, with diameters smaller than the depth of the tongue or groove can be 35 excluded.

WO 97/47834 PCT/EP97/03006 8 To this aim, this method shows the characteristic that the tongue and/or groove is realized by means of a milling process with at least two subsequent milling cycles by means of milling cutters which are positioned 5 in different angles in respect to the related floor panel. During each of the aforementioned milling cycles, preferably substantially the final form of one flank, either of the tongue or of the groove, is realized. 10 For the aforementioned two milling cycles, thus, milling cutters are used which extend outside the groove, respectively the tongue. More particularly the diameters of these milling cutters shall at least be 5 times and even better 20 times larger than the thickness of the 15 floor panels. The use of milling cutters showing the aforementioned diameters has as an advantage that the normal production speeds can be maintained which are also applied during 20 milling of a classical straight tongue and groove. There is also the advantage obtained that the installation of such milling cutters induce only minor or no additional costs because such milling cutters can be placed directly upon a motor shaft and/or the usual machines can be used. 25 With the intention of better showing the characteristics according to the invention, in the following, as an example without any limitative character, several preferred forms of embodiment are described, with 30 reference to the accompanying drawings, wherein: figure 1 represents a floor panel of a floor covering according to the invention; figure 2, on a larger scale, represents a cross 35 section according to line II-II in figure 1; figures 3 and 4 represent how two floor panels with WO 97/47834 PCTIEP97/03006 9 coupling parts according to figure 2 match into each other; figure 5, on a larger scale, represents a cross section according to line V-V in figure 1; 5 figures 6 and 7 represent how two floor panels with coupling parts according to figure 5 match into each other; figures 8 to 11 represent a number of variants of coupling parts of floor panels according to the 10 invention; figure 12 schematically represents how the floor parts can be provided with coupling parts; figure 13 represents a cross-section according to line XIII-XIII in figure 12; 15 figures 14 to 21, on a larger scale and in cross section, represent the penetration of the milling cutters which are indicated in figure 12 with arrows F14 to F21; figure 22 represents a floor panel according to the 20 invention; figure 23, on a larger scale, represents the coupling of two floor panels of figure 22; figures 24 and 25 represent two manners of coupling floor panels according to figure 22 to each other. 25 The invention relates to a floor covering which is composed of hard floor panels 1, for example, such as shown in figure 1. 30 These floor panels 1 can be of various shape, for example, rectangular or square, or of any other shape. In the most preferred form of embodiment, they shall be manufactured in an elongated form, such as shown in 35 figure 1, for example, with a length of 1 to 2 meters. The thickness, however, can also vary, but is preferably WO 97/47834 PCT/EP97/03006 10 0,5 to 1,5 cm, and more particularly 0,8 cm. Each floor panel 1 is, at least at the edges of two opposite sides 2-3, provided with coupling parts 4-5 5 which allow that two adjacent floor panels 1 can be coupled to each other. According to the invention, the coupling parts 4-5, as represented in the figures 2 to 4, are provided with 10 integrated mechanical locking parts 6 which prevent the drifting apart of two coupled floor panels 1 into a direction D perpendicular to the respective sides 2-3 and parallel to the underside 7 of the coupled floor panels 1; the coupling parts 4-5 and the locking means 6 are 15 realized in one piece with the core 8 of the floor panels 1; the coupling parts 4-5 have such a shape that two subsequent floor panels 1 can be engaged into each other exclusively by snapping-together and/or turning, whereby each subsequent floor panel 1 can be laterally inserted 20 into the previous; and the coupling parts 4-5 preferably provide in an interlocking free from play according to all directions in the plane which is situated perpendicular to the aforementioned edges. 25 In the case of floor panels 1 with an elongated shape, as represented in figure 1, the respective coupling parts 4 5 are situated at the longitudinal sides 2-3. The coupling parts 4-5 can be realized in various forms, 30 although the basic forms thereof will always be formed by a tongue 9 and a groove 10. In the form of embodiment of figures 2 to 4, the related floor panel 1 is provided with coupling parts 4-5 and 35 locking means 6 which allow to mutually engage two floor panels 1 by means of a turning movement, without the WO 97/47834 PCTIEP97/03006 11 occurance of any snap-together effect. In the represented example, the locking means 9 consist of a first locking element 11, formed by a protrusion 5 with a bent round shape at the lower side 12 of the tongue 9, and a second locking element 13, formed by a recess with a bent hollow shape in the lower wall 14 of the groove 10. 10 The locking elements 11-13 provide for that two floor panels 1 which are coupled to each other can not perform a lateral movement in the horizontal plane in respect to each other. 15 In order to obtain that two floor panels 1 can be inserted into each other by means of a turning movement, the curvatures preferably are circle-shaped. The bottom side 12 has a curvature with a radius R1, the center of which coincides with the related upper edge 15 of the 20 floor panel 1, whereas the lower wall 14 shows a curvature with a radius R2 which is equal to the radius R1, but whereby its center coincides with the related upper edge 16. Radii R1 and R2 may also be applied which are larger or smaller than the distance to the upper edge 25 15, 16 respectively, and/or which differ from each other in size. The upper side 17 of the tongue 9 and the upper wall 18 of the groove 10 are preferably flat and preferably are 30 situated in the horizontal plane. The front sides 19 and 20 of the tongue 9 and the groove 10 of two interlocked floor panels 1 preferably do not fit closely against each other, such, that in between an 35 intermediate space 21 is created into which possible dust remainders or such can be pushed away by means of the WO 97/47834 PCT/EP97/03006 12 tongue 9. The tongue 9 and the groove 10 preferably have shapes which are complementary to each other, such that the 5 tongue 9 in the engaged condition of two floor panels 1 precisely sits against the upper wall 18 and the lower wall 14 of the groove 10, whereby a pressure P, executed onto the upper lip 22, is received not only by this lip 22, but by the complete structure, because this pressure 10 can be transmitted through the tongue 9 and the lower lip 23. It is, however, clear that a number of minor deviations to these complementary forms can occur which, anyhow, 15 have no or almost no effect upon the receipt and transmission of pressure forces. For example, a chamfer 24 and a recess 25 can be provided, as represented in figures 2 to 4, as a result of which is obtained that the subsequent floor panels 1 can easily be pushed into each 20 other, such that no possible ridges or such render the good insertion difficult. As represented in the figures 5 to 7, the floor panels 1 according to the invention can also, along the sides 26 25 27 which are at a right angle to the sides 2-3, be provided with coupling parts 28-29 which have locking means 30, too. The coupling parts 28-29 are preferably also realized in the shape of a tongue 31 and a groove 32. Hereby, the locking means 30 do not have to be of the 30 same nature as the locking means 6. Preferably, at the sides 26-27 locking means are applied which allow for an engagement and interlocking by means of a translation movement T only, as represented in 35 figures 6 and 7. To this aim, the locking means 30 consist of a snap-together connection with locking WO 97/47834 PCT/EP97/03006 13 elements 33 and 34 which grip behind each other. As represented in figures 5 to 7, the locking element 33 preferably consists of a protrusion of the lower side 35 5 of the tongue 31 which can take place in a recess 36 in the lower wall 37 of the groove 32. The locking element 34 is formed by the upward directed part which limits the recess 36. 10 In this case, the locking elements 33-34 have contact planes 38-39 which are parallel to each other and preferably extend in an inclined manner, according to a direction which simplifies the snapping-together. The tangent line L which is determined by the contact planes 15 38-39, hereby forms an angle A with the underside 7 which is smaller than 90*. The locking elements 33-34 preferably are provided with inclined portions 40 and 41 which, when engaging two 20 floor panels 1, cooperate with each other in such a manner that the locking elements 33-34 can easily be pushed over each other until they grip behind each other by means of a snap-together effect. 25 The thickness W1 of the tongue 31 preferably is equal to the width W of the groove 32, such that the upper lip 42, when exerting a pressure P, is supported by the tongue 31 which, in its turn, then is supported by the lower lip 43. 30 Analogous to the chamfer 24 and recess 25, a recess 44 and a chamfer 45 are provided also at the edges 28-29. It is noted that such a snap-together coupling can also 35 be applied at the edges 2-3. Hereby, this can be a snap together coupling analogous to these of figures 5 to 7, WO 97/47834 PCTIEP97/03006 14 but this can also be a snap-together coupling whereby other forms of coupling parts are applied, for example, such as represented in figures 8 and 9. Contrary to the locking elements 33-34 which consist of rather local 5 protrusions, in the forms of embodiment of figures 8 and 9 use is made of locking elements 46-47 which, in comparison to the total width B of the coupling, extend over a rather large distance. 10 In this case, the locking elements 46-47 are also provided at the lower side 12 of the tongue 9 and the lower wall 14 of the groove 10. According to figure 8, the locking elements 46-47 have 15 contact surfaces 48-49 which are at an angle with the plane of the floor panel 1. Hereby, a coupling is obtained which is interlocked in a particularly fixed manner. 20 As represented in figure 9, the locking elements 46-47 possibly can be realized in such a manner that substantially only a linear contact is obtained, for example, because the contact surfaces directed towards each other are realized with different curvatures. 25 The surfaces, directed towards each other, of the locking elements 46-47 hereby consist of bent surfaces. The tangent line L forms an angle A which is smaller than 90', and even better is smaller than 70*. 30 Hereby, the locking element 46 preferably has two portions with a different curvature, on one hand, a portion 50 with a strong curvature and, on the other hand, a portion 51 with a weak curvature. The portion 50 35 with the strong curvature provides for the formation of a firm coupling. The portion 51 with the weak curvature WO 97/47834 PCT/EP97/03006 15 allows that the coupling parts 4-5 can be brought into each other easily. The intermediate space S forms a chamber which offers space for dust and similar which, when engaging two floor panels 1, gets there eventually. 5 In the case of a snap-together connection, for example, a connection, such as represented in figures 7 to 9, preferably always the tongue 9-31 has a shape, thickening towards below, which can cooperate with a widened portion 10 in the groove 10. In figure 10, a variant is represented whereby at least at the height of the upper edges 15-16, a sealing material 52 is provided, as a result of which a 15 watertight sealing can be guaranteed. This sealing material 52 may consist of a strip or covering which is provided previously at the floor panel 1, either at one or both upper edges 15-16. 20 In figure 11, a further variant is represented, whereby the locking means 6 are formed by an upward directed portion 53 at the tongue 9 which, as a result of a turning movement, is brought behind a downward-directed portion 54 at the upper wall 18. More particularly, this 25 is obtained by realizing the upper side 17 and the upper wall 18 with a curvature R3, the center of which is situated at the edges 15-16, and realizing the lower side 12 and the lower wall 14 with a radius R4, the center of which is also situated at the upper edges 15 and 16, 30 respectively. These radii R3-R4 can be chosen otherwise, too. In general, according to the invention, the difference between, on one hand, the radius R1, R3 respectively, 35 and, on the other hand, the radius R2, R4 respectively, preferably should not be larger than 2 mm.

WO 97/47834 PCT/EP97/03006 16 It is also preferred that the center of these radii is situated inside the circle Cl, C2 respectively, which extends with a radius R5 of 3 mm around the upper edge 15, 16 respectively, such as, for example, indicated in 5 figure 2. Finally is noted that, according to the invention, the lower lip 23-43, as represented in figures 2 to 7, can be realized longer than the upper lip 22-42. This has as an 10 advantage that the coupling parts 4-5-28-29 can be realized in an easier manner by means of a milling cutter or such. Furthermore, this simplifies the engagement of two floor panels 1, because each subsequent floor panel 1 during installation can be placed upon the protruding 15 lower lip 23-43, as a result of which the tongue 9-31 and the groove 10-32 automatically are positioned in front of each other. The embodiments whereby the lower lip 23 is equal to or 20 shorter than the upper lip 22, in their turn, offer the advantage that no protruding lip 23 remains at the extreme edge of the floor which might cause problems in the finishing. 25 In order to allow for a smooth assembly, in order to guarantee the necessary stability and firmness and in order to limit the quantity of material to be cut away, the difference E between the upper lip 22-42 and the lower lip 23-43, measured in the plane of the floor panel 30 and perpendicular to the longitudinal direction of the groove 10, should preferably be kept smaller than one time the total thickness F of the floor panel 1. For stability's sake, normally this total thickness F shall never be less than 5 mm. 35 The small dimension of the difference E offers the WO 97/47834 PCT/EP97/03006 17 advantage that the lower lip must not be strengthened by a reinforcement strip or the like. According to a particular form of embodiment, the central 5 line M1 through the tongue 9 and the groove 10 is situated lower than the center M2 of the floor panel 1, such, that the upper lip 22-42 is thicker than the lower lip 23-43. In first instance, this is essential in this kind of connections, because then it is the lower lip 23 10 43 which bends, such that the upper side of the floor panel 1 is kept free of possible deformations. As explained in the introduction, for the core 8 a material is chosen from the following series: 15 -a ground product which, by means of a binding agent or by means of melting together, is composed to a single compound; -a product based on synthetic material; -chip board with fine chips. 20 The invention shows its usefulness, in first instance, preferably with laminated flooring, due to the reasons explained in the introduction. 25 As represented in the examples of the figures 2 to 11, such laminated flooring preferably consists of a core 8 made of MDF board, HDF board or similar, whereby at least at the upper side of this core 8 one or more layers of material are provided. 30 More particularly, it is preferred that the laminated flooring is provided with a decorative layer 55 and a protective top layer 56. The decorative layer 55 is a layer, impregnated with resin, for example, made of 35 paper, which can be imprinted with a variety of patterns, such as a wood pattern, a pattern in the form of stone, WO 97/47834 PCT/EP97/03006 18 cork, or similar or even with a fancy pattern. The protective top layer 56 preferably also consists of a layer saturated with resin, for example, melamine resin, made of a transparent material. 5 It is clear that still other layers can be applied, such as an intermediate layer 57 upon which the decorative layer 55 is provided. 10 Preferably, also a backing layer 58 shall be applied at the underside 7, forming a counterbalancing element for the top layers and, thus, guaranteeing the stability of the form of the floor panel 1. This backing layer 58 may consist of a material, for example paper, impregnated 15 with a resin, for example, a melamine resin. As represented schematically in figure 12, the tongue 9 and the groove 10, and preferably also the tongue 31 and the groove 32 are applied by means of a milling process. 20 In the case that a profile has to be applied on all four sides, the floor panels 1 preferably shall be displaced by means of two perpendicular movements V1 and V2, whereby during the first movement profiles at two opposite edges are provided, in this case the 25 longitudinal edges, by means of milling devices 59-60, whereas during the second movement profiles are provided at the other edges, in this case the small edges, by means of milling devices 61-62. During these processing, the floor panels 1 preferably are put with their 30 decorative layer directed downward. According to an important characteristic of the invention, each respective tongue 9-31 and groove 10-32 are realized by means of a milling process with at least 35 two subsequent milling cycles by means of milling cutters which are positioned at different angles in reference to WO 97/47834 PCTIEP97/03006 19 the related floor panel 1. This is illustrated in figures 13, 14 and 15, wherein it is represented how a groove 10 is realized by means of 5 two milling cycles by means of two milling cutters 63 and 64. Figures 16 and 17 represent how the tongue 9 is realized by means of milling cutters 65 and 66. The figures 18-19 and 20-21 represent similar views 10 showing how the groove 32 and the tongue 31 are realized by means of milling cutters 67-68 and 69-70, positioned at an angle. During each of the aforementioned milling cycles, each 15 time substantially the final shape of one flank is realized. For example, the milling cutter 63 of figure 14 determines the final shape of the lower flank 71 of the groove 10, whereas the milling cutter 64 determines the final shape of the upper flank 72. 20 As mentioned in the introduction, preferably milling cutters 63 to 72 shall be applied, having diameters G which are at least 5 times, and even better at least 20 times larger than the thickness F of the floor panels 1. 25 Apart of the mentioned milling cutters, preferably still other milling cutters are applied, for example, in order to remove a part of the material to be removed already during a first premachining cycle. 30 In the figures 22 to 25, a particularly preferred form of embodiment of a floor panel 1 according to the invention is represented. Hereby, the parts which are taken over from the aforegoing forms of embodiment are indicated 35 with corresponding references.

WO 97/47834 PCT/EP97/03006 20 An important characteristic herein consists in that the coupling parts 4-5 are provided with locking means 6 which, in engaged condition, exert a tension force upon each other, as a result of which the engaged floor 5 portions 1 are forced towards each other. As represented, this is realized preferably by providing the coupling parts with an elastically bendable portion, in this case the lip 43, which, in engaged condition, is at least partially bent and in this way creates a tension force 10 which provides for that the engaged floor panels 1 are forced towards each other. The hereby resulting bending V, as well as the tension force K resulting herefrom, are indicated in the enlargement of figure 23. 15 In order to obtain that the tension force K results in pressing together the engaged floor panels 1, the bendable portion, in this case the lip 43, preferably is provided, as represented, with an inwardly inclined contact surface 73 which preferably can cooperate with a 20 corresponding contact surface 74. These contact surfaces 73-74 are similar to the aforementioned contact surfaces 39-38 and also similar to the inclined portions of the lower lip of figures 2 to 4. 25 In the figures 2 and 5, the portions form complementary matching shapes; it is, however, clear that, by a modification, also a tension effect similar as in figure 23 can be realized. 30 Due to, on one hand, the contact under the angle A, and, on the other hand, the fact that a tension force K is created, a force component K1 is effected, as a result of which the floor panels 1 are drawn against each other. 35 Preferably, the angle A of the contact surfaces 73-74 in respect to the horizontal plane is situated between 30 WO 97/47834 PCT/EP97/03006 21 and 70 degrees. In first instance in the case that use is made of the embodiment whereby a tension force K is realized, an angle A of 30 to 70 degrees is ideal in order, on one hand, to effect an optimum pressing 5 together of the floor panels 1 and, on the other hand, to obtain that the floor panels 1 can easily be engaged, respectively disassembled. Although the pressing force Kl preferably is delivered by 10 the aforementioned lip 43, the invention does not exclude other forms of embodiment whereby this force is delivered by other bendable portions. It is noted that the bending V is relatively small, for 15 example, several hundredths up to several tenths of a millimeter, and does not have an influence upon the placement of the floor covering. Furthermore is noted that such floor covering generally is placed upon an underlayer which is elastically compressible, as a result 20 of which the bending V of the lip 43 exclusively results in the fact that the underlayer locally is compressed somewhat more. Due to the fact that the lip 43 is bent apart and that it 25 remains somewhat bent apart in engaged position, also the advantage is effected that, when exerting a pressure upon the floor covering, for example, when placing an object thereupon, the pressing-together force is enhanced and, thus, the development of gaps is counteracted even more. 30 It is noted that the inventor has found that, contrary to all expectations, an ideal tension force can be realized by manufacturing the coupling parts 4-5, including the locking elements 33-34, and preferably the complete core 35 8, of HDF board or MDF board, although these materials only allow a minor elastic deformation.

WO 97/47834 PCT/EP97/03006 22 HDF and MDF also offer the advantage that smooth surfaces are obtained, as a result of which the locking elements can be moved easily over each other. 5 According to a variant of the invention, the tension force can also be delivered by means of an elastic compression of the material of the coupling parts, to which end these coupling parts, and preferably the complete core 8, then have to be manufactured in an 10 elastically compressible material. A further particular characteristic of the embodiment of figures 22 to 25 consists in that the floor panels 1 can be engaged by means of a turning movement, as represented 15 in figure 24, as well as by means of shifting them towards each other, as represented in figure 25, preferably in such a manner that, during the engagement by means of the turning movement, a maximum bending Vm results in the coupling parts, more particularly in the 20 lip 43, which bending Vm is less pronounced, if not non existent, as in the figures 2 to 4, in comparison to the bending Vm which results when the floor panels 1 are engaged by means of shifting them towards each other. 25 The advantage of this consists in that the floor panels I can be engaged easily by means of a turning movement, without necessitating a tool therefore, whereas it still remains possible to engage the floor panels also by means of shifting them. This latter is useful, in first 30 instance, when the last panel has to be placed partially under a door frame or similar. In this case, the floor panel 1 can be pushed under the door frame with the side which does not have to be engaged and subsequently, possibly by means of tools, can be snapped into the 35 adjacent floor panel 1.

WO 97/47834 PCTIEP97/03006 23 It is noted that the shapes of the coupling parts 4-5 shown in figures 22 to 25 can also be used for the coupling parts 28-29 of the short sides. 5 According to the invention, in the case that the four sides 2-3-26-27 are provided with coupling parts 4-5-28 29, these coupling parts can be realized in such a manner that in one direction a firmer engagement than in the other direction is effected. In the case of elongated 10 floor panels 1, for example, such as represented in figure 1, the locking at the small sides 26-27 preferably shall be more pronounced than at the longitudinal sides 2-3. The length of the coupling at the small sides, namely, is smaller and, in principle, less firm. This is 15 compensated by providing in a more pronounced locking. This difference in engagement can be obtained by realizing the contact surfaces 73-74 under different angles. 20 Preferably, the aforementioned protrusion, more particularly the locking element 33, is bordered by at least two portions 75-76, respectively a portion 75 with a strong inclination which provides for the locking, and 25 a portion 76 with a weaker inclination which renders the engagement of the coupling parts easier. In the embodiment of figures 22 to 25, these portions 75-76 are formed by straight planes, but, as already described in reference to figure 9, use can also be made of curved 30 portions 50-51. In figure 5, these are the contact surface 38 and the inclined portion 40. In the preferred form of embodiment, the floor panels 1 according to the invention comprise coupling parts 4-5 35 and/or 28-29 showing one of the following or the combination of two or more of the following features: WO 97/47834 PCT/EP97/03006 24 - a curvature 77 at the lower side of the tongue 9 and/or a curvature 78 .at the lip 43 which form a guidance when turning two floor panels 1 into each other, with the advantage that the floor panels I can 5 be engaged into each other easily during installing; - roundings 79-80 at the edges of the locking elements 33-34, with the advantages that the locking elements can easily shift over each other during the engagement, respectively disassembly of the floor 10 panels 1 and that the locking elements are not damaged, for example, crumble away at their edges, even if the floor panels are engaged, respectively disassembled, repeatedly; - dust chambers 81, or spaces 21 as in figure 4, 15 between all sides, directed laterally towards each other, of the engaged floor panels 1, with the advantage that inclusions which get between the floor panels 1 during the engagement do not exert a disadvantageous influence upon the good engagement; 20 - a shaping of the tongue 9 which is such, for example, by the presence of a chamfer 82, that the upper side of the tongue 9 already with the first contact becomes situated under the lower side of the upper lip 42 when the floor panels 1 are pushed 25 towards each other at the same level, as indicated in figure 25, with the advantage that the front extremity of the tongue 9 does not press against the front side of the upper lip 42 when the floor panels are pushed towards each other at the same level; 30 - a ramp surface 83, hereinbefore also called inclined portion 41, formed at the free extremity of the lower lip 43, with the advantage that the locking elements 33-34 shift smoothly over each other and that the lower lip 43 is bent uniformly; 35 - in the engagement direction only one important contact point which is formed by a section 84 at the WO 97/47834 PCT/EP97/03006 25 location of the top side of the floor panels 1, with the advantage that the aforementioned tension force is optimally transferred to the upper side of the floor panels 1 and that the development of openings 5 between the floor panels 1 is counteracted; - contact surfaces 85-86, more particularly abutment surfaces, formed by the upper side of the tongue 9 and the upper side of the groove 10 which, over the largest portion of their length, run parallel to the 10 plane which is defined by the floor panels 1, as well as contact surfaces cooperating with each other, formed by curvatures 77-78, with the advantage that no mutual displacement in height between two engaged floor panels 1 is possible, even if the insertion 15 depth of the tongue 9 into the groove 10 should vary due to which causes whatsoever, in other words, that no height differences may occur between the adjacent floor panels. 20 In the form of embodiment of figures 22 to 25, all these characteristics are combined; it is, however, clear that, as becomes evident from figures 2 to 11, these features can also be present separately or in a limited combination. 25 As becomes evident from figures 5 to 7 and 22 to 25, an important characteristic of the preferred form of embodiment of the invention consists in that the locking means 6, in other words, the portion providing for the 30 snap-together and engagement effect, are situated in that portion of the lower lip 23-43 which extends beyond the upper lip 22-42, more particularly, that the lowermost point 87 of the locking part 33 is situated under the top layer of the floor panel 1. For clarity's sake, this top 35 layer is indicated in the figures 22 to 25 only as a single layer.

WO 97/47834 PCT/EP97/03006 26 It is noted that the combination of features, that the lower lip 23-43 extends further than the upper lip 22-42, that the locking means 6 are formed at least by means of a portion which inwardly slopes downward, and that this 5 portion, at least partially, is located in the portion of the lower lip 23-43 which extends beyond the upper lip 22-42, is particularly advantageous, among others, in comparison with the couplings for floor panels described in the documents WO 94/01628, WO 94/26999, WO 96/27719 10 and WO 96/27721. The sloping portion offers the advantage that the floor panels 1 can be disassembled again. The fact that this sloping portion is situated in the further extending portion of the lower lip 23-43 additionally to this offers the advantage that no deformations can occur 15 during coupling which manifest themselves up to the top layer. According to a preferred characteristic of the invention, the aforementioned portion, i.e. the contact surface 39 20 or 73, preferably extends in such a manner that the distance up to the upper edge 16 diminishes from below in upward direction, in other words, such that, as represented in figure 22, the distance X2 is smaller than the distance X1. This is also the case in figure 7. 25 Still preferably, this portion only starts at a clear distance El from the upper lip 42. It is obvious that the coupling parts 22 to 25 can also 30 be realized by means of said milling process. According to a particular characteristic of the invention, the floor panels 1 are treated at their sides 2-3 and/or 26-27 with a surface densifying agent, more 35 particularly a surface hardening agent, which preferably is chosen from the following series of products: WO 97/47834 PCT/EP97/03006 27 impregnation agents, pore-sealing agents, lacquers, resins, oils, paraffines and similar. In figure 22, such impregnation 88 is represented 5 schematically. This treatment can be performed over the complete surface of the sides 2-3 and/or 26-27 or only over well-defined portions hereof, for example, exclusively the surfaces of the tongue 9 and the groove 10. 10 The treatment with a surface densifying agent offers, in combination with the snap-together effect, the advantage that in various aspects better coupling features are obtained. As a result of this, the coupling parts 4-5 15 and/or 28-29 better keep their shape and strength, even if the floor panels 1 are engaged and disassembled repeatedly. Especially in the case that for the core 8 use is made of HDF, MDF or similiar, by means of this treatment such a better quality of surface condition is 20 obtained, that no abrasion of material occurs during engaging, respectively during disassembling. This treatment also offers the advantage that, at least in the case of a surface hardening, the aforementioned 25 elastic tensioning effect is enhanced. The present invention is in no way limited to the forms of embodiment described by way of example and represented in the figures, however, can such floor covering and the 30 pertaining floor panels 1 be realized in various forms and dimensions without leaving the scope of the invention. For example, the various characteristics which are 35 described by means of the represented forms of embodiment, may be combined with each other or not.

WO 97/47834 PCT/EP97/03006 28 Furthermore, all embodiments of coupling elements described before can be applied at the longer side as well as at the shorter side.

Claims (32)

1. A coupling system for joining panels, which panels are rectangular, i.e. elongated or square, and which comprise a core, said core being of a core material selected from the group consisting of medium density fibreboard (MDF) and high density fibre board (HDF); said panels comprising a decorative side, a back side opposite from the decorative side, a first pair of opposite side edges and a second pair of opposite side edges; said coupling system comprising coupling parts provided at said first pair of opposite side edges and allowing that two of such panels can be coupled to each other at the concerned side edges; wherein these coupling parts are substantially in the form of a tongue and a groove, said tongue and groove being monolithically formed in one piece with said core material selected from the group consisting of medium density fibreboard (MDF) and high density fibre board (HDF); wherein said groove closest to said decorative side is bordered by a first lip having a distal end and said groove closest to said back side is bordered by a second lip, said second lip extending beyond said distal end of the first lip; wherein the coupling parts are provided with integrated mechanical locking elements which in a free coupled condition prevent the drifting apart of two coupled panels in a direction perpendicular to the related side edges and parallel to the plane of the coupled panels; wherein said locking elements define contact surfaces, respectively at said second lip and said tongue, acting as locking surfaces which in a coupled condition of two of such panels prevent said drifting apart of the panels, the locking surface provided at the groove being located in said second lip at a location beyond the distal end of said first lip; 30 wherein the coupling parts and locking elements allow that two of such panels can be joined by means of a turning movement; wherein at least at one of the locking elements there is provided of a rounding for facilitating the engagement of said locking surfaces behind each other when coupling two of said panels, said rounding also being monolithically formed in said core material.

2. The coupling system of claim 1, wherein said rounding is at least provided at the locking element of the tongue.

3. The coupling system of claim 1, wherein a rounding is at least provided at the locking element of the second lip.

4. The coupling system of claim 1, wherein such rounding is provided at each of said two locking elements.

5. The coupling system of any of the preceding claims, wherein the length with which the second lip extends beyond the first lip, measured in the plane of the panel, is smaller than one time the thickness of the panel.

6. The coupling system of any of the preceding claims, wherein said contact surfaces acting as locking surfaces are realized in such a manner that the tangent line which is defined by said contact surfaces forms an angle with the plane of the coupled panels which is smaller than 90 degrees.

7. The coupling system of any of the preceding claims, wherein said contact surfaces acting as locking surfaces are shaped as flat contact planes. 31

8. The coupling system of any of the preceding claims, wherein said longer lip is provided with a recess, said recess distally thereof being bordered by the corresponding locking portion and wherein said groove proximally from said recess comprises a distinctly formed actual wall portion of the groove.

9. The coupling system of any of the preceding claims, wherein the coupling parts and locking elements, inclusive said roundings, are realized as cut profiles.

10. The coupling of any of the preceding claims, wherein the coupling system provides a coupling between floor panels.

11. A coupling system for joining panels, which panels are rectangular, i.e. elongated or square, and which comprise a core, said core being of a core material selected from the group consisting of medium density fibreboard (MDF) and high density fibre board (HDF); said panels comprising a decorative side, a back side opposite from the decorative side, a first pair of opposite side edges and a second pair of opposite side edges; said coupling system comprising coupling parts provided at said first pair of opposite side edges and allowing that two of such panels can be coupled to each other at the concerned side edges; wherein these coupling parts are substantially in the form of a tongue and a groove, said tongue and groove being monolithically formed in one piece with said core material selected from the group consisting of medium density fibreboard (MDF) and high density fibre board (HDF); wherein said groove closest to said decorative side is bordered by a first lip having a distal end and said groove closest to said back side is bordered by a second lip, also having a distal end, said second lip extending beyond said distal end of the first lip; 32 wherein the coupling parts are provided with integrated mechanical locking elements which in a free coupled condition prevent the drifting apart of two coupled panels in a direction perpendicular to the related side edges and parallel to the plane of the coupled panels; wherein said locking elements define contact surfaces, respectively at said second lip and said tongue, acting as locking surfaces which in a coupled condition of two of such panels prevent said drifting apart of the panels, the locking surface provided at the groove being located in said second lip at a location beyond the distal end of said first lip; wherein said locking elements which prevent the drifting apart of coupled panels in a plane parallel to the plane of the panels are only active between said second lip and the corresponding side of the tongue; wherein the coupling parts and locking elements allow that two of such panels can be joined by means of a turning movement; and wherein said coupling parts and locking elements are configured such that in the coupled condition of two of such panels at least two intermediate spaces exist between the coupled side edges, respectively a first intermediate space and a second intermediate space; said first intermediate space being located between the deepest point of the groove and the distal end of the tongue and extending at least partly between the second lip and the tongue; and said second intermediate space being located between the distal end of the second lip of the one of the coupled panels and a wall portion of the other of the panels that is located in front of said distal end.

12. The coupling system of claim 11, wherein the length with which the second lip extends beyond the first lip, measured in the 33 plane of the panel, is smaller than one time the thickness of the panel.

13. The coupling system of claim 11 or 12, wherein said contact surfaces acting as locking surfaces are realized in such a manner that the tangent line which is defined by said contact surfaces forms an angle with the plane of the coupled panels which is smaller than 90 degrees.

14. The coupling system of any of claims 11 to 13, wherein said contact surfaces acting as locking surfaces are shaped as flat contact planes.

15. The coupling system of any of claims 11 to 14, wherein said longer lip is provided with a recess, said recess distally thereof being bordered by the corresponding locking portion and wherein said groove proximally from said recess comprises a distinctly formed actual wall portion of the groove.

16. The coupling system of any of claims 11 to 15, wherein the coupling parts and locking elements are realized as cut profiles.

17. The coupling system of any of claims 11 to 16, wherein said locking element at the tongue is a protrusion which cooperates with a recess in the second lip.

18. The coupling system of any of claims 11 to 17, wherein the coupling system provides a coupling between floor panels.

19. A floor panel, for forming a floor covering, said floor panel being rectangular and having a first pair of opposite sides and a second pair of opposite sides, defining the edges of the panel; 34 wherein said floor panel at the first pair as well as the second pair of opposite sides is provided with coupling parts, wherein these coupling parts allow that two of such panels can be coupled to each other; wherein said coupling parts at both pairs of sides provide in a locking of two coupled panels in a direction perpendicular to the plane of the panels and comprise integrated mechanical locking elements which prevent the drifting apart of two coupled floor panels in a direction perpendicular to the related edges and parallel to the underside of the coupled floor panels; wherein the panel comprises a core of a material based on synthetic material; and wherein at least a decorative layer is provided at the upper side of said core.

20. The floor panel of claim 19, wherein the coupling parts and locking elements of at least one of said pairs of sides are realized as cut profiles.

21. The floor panel of claim 19, wherein the coupling parts and locking elements of both pairs of sides are realized as cut profiles.

22. The floor panel of any of claims 19 to 21, said floor panel being of the type for forming a thin decorative floor covering with a thickness not exceeding 1.5 cm; wherein the coupling parts and locking elements at both pairs of sides are formed in one piece with the panel, more particularly in one piece from said core material; wherein the coupling parts and locking elements at the first pair of opposite sides allow that two of said panels can be joined by turning; and wherein the coupling parts and locking elements at the second pair of opposite sides allow that two of 35 said panels can be joined by the intermediate of a snapping action.

23. The floor panel of any of claims 19 to 21, said floor panel being of the type for forming a thin decorative floor covering with a thickness not exceeding 1.5 cm; wherein the coupling parts and locking elements at both pairs of sides are formed in one piece with the panel, more particularly in one piece from said core material; wherein the coupling parts and locking elements at the first pair of opposite sides allow that two of said panels can be joined by snapping; and wherein the coupling parts and locking elements at the second pair of opposite sides allow that two of said panels can be joined by snapping.

24. The floor panel of any of claims 19 to 21, said floor panel being of the type for forming a thin decorative floor covering with a thickness not exceeding 1.5 cm; wherein the coupling parts and locking elements at both pairs of sides are formed in one piece with the panel, more particularly in one piece from said core material; wherein the coupling parts and locking elements at the first pair of opposite sides allow that two of said panels can be joined by turning; and wherein the coupling parts and locking elements at the second pair of opposite sides allow that two of said panels can also be joined by turning.

25. The floor panel of any of claims 19 to 21, wherein the coupling parts and locking elements at the second pair of opposite sides allow that two of said panels can be joined by means of an angling motion as well as by means of a shifting and snapping motion.

26. The floor panel of any of claims 19 to 25, wherein the coupling parts at the first pair of opposite sides are 36 substantially in the form of a tongue and a groove, said groove being bordered by an upper lip and by a lower lip.

27. The floor panel of claim 26, wherein at said first pair of opposite sides said lower lip extends beyond the distal end of the upper lip.

28. The floor panel of claim 19 to 27, wherein the coupling parts at the second pair of opposite sides are substantially in the form of a tongue and a groove, said groove being bordered by an upper lip and by a lower lip.

29. The floor panel of any of claims 19 to 28, wherein at said first pair of sides said coupling parts and locking elements allow to couple two of such panels in a manner free from play.

30. The floor panel of any of claims 19 to 28, wherein at both pairs of sides said coupling parts and locking elements allow to couple two of such panels in a manner free from play.

31. The floor panel of any of claims 19 to 30, wherein the coupling parts and the locking elements at the first pair of opposite sides are made in one piece from said core.

32. The floor panel of any of claims 19 to 31, wherein the coupling parts and the locking elements at both pairs of opposite sides are made in one piece from said core.