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Floor covering, including 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, wherein the coupling parts are provided with integrated mechanical locking elements whic

Floor covering, including 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, wherein the coupling parts are provided with integrated mechanical locking elements which prevent the drifting apart of two coupled floor panels in a direction (R) perpendicular to the related edges and parallel to the underside of the coupled floor panels, and provide a snap-action coupling.

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What is claimed is: 1. Method for making a floor panel having at least a core and at least two opposite side edges, said method producing a profile on at least one of said opposite side edges, said profile comprising a groove extending distally transversely along said at least one of said opposite

What is claimed is: 1. Method for making a floor panel having at least a core and at least two opposite side edges, said method producing a profile on at least one of said opposite side edges, said profile comprising a groove extending distally transversely along said at least one of said opposite side edges of said floor panel, comprising the steps: forming said profile by means of at least two rotary cutting tools having peripheral cutting teeth and which are positioned at different angles relative to said floor panel; using said tools, forming said groove with an upper side and a bottom side such that said groove is bordered by an upper lip and a lower lip; forming said lower lip such that it comprises a first portion located vertically underneath said upper lip and a second portion that extends distally beyond said upper lip, and such that an upper side of said lower lip of said groove includes a recess; forming said upper side of said groove with a substantially flat portion, using at least a first one of said two tools; forming said recess partially in said first portion of said lower lip as well as partially in said second portion of said lower lip, such that said recess extends from a proximally inner area of said first portion of said lower lip to a distally outer area of said second portion of said lower lip located beyond said upper lip, said forming of said recess being carried out using at least the second one of said two tools; said profile defining a groove locking surface in the recess of the lower lip such that, when two of such panels are coupled along cooperating side edges that include said groove and a cooperating tongue on an opposite side edge of the panel that includes a cooperating tongue locking surface, said locking surfaces are in contact with each other and respective upper side edges of the panels are in adjoining relationship and are secured in such adjoining relationship against separation in a direction parallel to the principal plane of the panels and perpendicular to the cooperating panel side edges by said locking surfaces. 2. Method according to claim 1, including forming said recess with a distal side wall that slopes downwardly in a direction extending from a distally outer area of said lower lip towards a proximally inner area of said lower lip and positioning the first one of said two tools in a plane that extends substantially parallel to a plane including said floor panel, and causing said first one of said tools to enter said at least one side edge of said floor pane to form said upper and bottom groove sides; and advancing the second one of said two tools into the upper side of the lower lip while the second tool it is inclined relative to said plane at an angle of between 30 and 70 degrees to form said recess. 3. Method for making a floor panel having at least a core and at least two opposite side edges, said method producing a profile on at least one of said opposite side edges, said profile comprising a groove extending distally transversely along said at least one of said opposite side edges of said floor panel, comprising the steps: forming said profile by means of at least two rotary cutting tools having peripheral cutting teeth and which are positioned at different angles relative to said floor panel; using said tools, forming said groove with an upper side and a bottom side such that said groove is bordered by an upper lip and a lower lip; forming said lower lip such that it comprises a first portion located vertically underneath said upper lip and a second portion that extends distally beyond said upper lip, and such that an upper side of said lower lip of said groove includes a recess; forming said upper side of said groove with a substantially flat portion; forming said recess partially in said first portion of said lower lip as well as partially in said second portion of said lower lip, such that said recess extends from a proximally inner area of the first portion of said lower lip to a distally outer area of said second portion of said lower lip located beyond said upper lip; said forming of said groove including positioning a first one of said two tools in a plane that extends substantially parallel to a plane including said floor panel, and causing said first one of said tools to enter said side edge of said floor panel laterally to form said groove upper side and bottom side; and advancing the second one of said two tools into the upper side of the lower lip while the second tool is inclined in reference to said plane by an angle less than 90 degrees to form said recess in the groove lower lip; said profile defining a groove locking surface in the recess of the lower lip such that, when two of such panels are coupled along cooperating side edges that include said groove and a cooperating tongue on an opposite side edge of the panel that includes a cooperating tongue locking surface, said locking surfaces are in contact with each other and respective upper side edges of the panels are in adjoining relationship and are secured in such adjoining relationship against separation in a direction parallel to the principal plane of the panels and perpendicular to the cooperating panel side edges by said locking surfaces. 4. Method for making a floor panel having at least a core and at least two opposite side edges, said method producing a profile on at least one of said opposite side edges, said profile comprising a groove extending distally transversely along said at least one of said opposite side edges of said floor panel, comprising the steps: forming said profile by means of at least two rotary cutting tools having peripheral cutting teeth and which are positioned at different angles relative to said floor panel; forming said groove using at least a first one of said tools to provide the groove with an upper side and a bottom side such that said groove is bordered by an upper lip and a lower lip; forming said lower lip such that it comprises a first portion located vertically underneath said upper lip and a second portion that extends distally beyond said upper lip, and such that an upper side of said lower lip of said groove includes a recess; forming said upper side of said groove with a substantially flat portion; forming said recess partially in said first portion of said lower lip as well as partially in said second portion of said lower lip using the second one of said tools, such that said recess extends from a proximally inner area of said first portion of said lower lip to a distally outer area of said second portion of said lower lip located beyond said upper lip; and using a third tool to remove a part of the material of said floor panel at said at least one side edge during a first pre-machining cycle; said profile defining a groove locking surface in the recess of the lower lip such that, when two of such panels are coupled along cooperating side edges that include said groove and a cooperating tongue on an opposite side edge of the panel that includes a cooperating tongue locking surface, said locking surfaces are in contact with each other and respective upper side edges of the panels are in adjoining relationship and are secured in such adjoining relationship against separation in a direction parallel to the principal plane of the panels and perpendicular to the cooperating panel side edges by said locking surfaces. 5. Method according to claim 3, wherein said angle is between 30 and 70 degrees. 6. Method according to claim 1, 3 or 4, including forming said recess with a distal side wall that slopes downwardly in a direction extending from a distally outer area of said lower lip towards a proximally inner area of said lower lip. 7. Method according to claim 1, 3 or 4, wherein said substantially flat portion of said upper lip is located in a plane that extends substantially parallel to a plane including said floor panel. 8. Method according to claim 1, 3 or 4, including forming said profile in one piece with said core of said floor panel; said core being selected from a wood-based material. 9. Method according to claim 8, wherein said core is selected to be a ground wood product which, by means of a binding agent, has been made into a unitary composite material. 10. Method according to claim 9, wherein said selected core comprises chipboard with fine chips. 11. Method according to claim 9, wherein said selected core comprises a medium or high density fiberboard (MDF or HDF). 12. Method according to claim 1, 3 or 4, wherein said profile is formed in one piece with said core of said floor panel and wherein said core is selected as a product based on synthetic material. 13. Method according to claim 1, 3 or 4, wherein said core comprises a top side and a bottom side, including providing said top side with a decorative layer and providing said bottom side with a backing layer. 14. Method according to claim 13, wherein said decorative layer and said backing layer are selected as layers made of paper impregnated with a resin; said decorative layer being imprinted. 15. Method according to claim 13, including providing said top side with a protective top layer comprising a layer saturated with a resin. 16. Method according to claim 1, 3 or 4, wherein said at least two tools are rotary milling cutters. 17. Method according to claim 16, wherein said rotary milling cutters extend outside said groove when forming the groove and recess, and have diameters which are at least 5 times larger than the thickness of the floor panel. 18. Method according to claim 17, wherein said diameters are at least 20 times larger than the thickness of the floor panel. 19. Method according to claim 1 or 4, including positioning a first one of said two tools in a plane that extends substantially parallel to a plane including said floor panel, and causing said first one of said tools to enter said side edge of said floor panel laterally to form said groove; and wherein the second one of said two tools is inclined in reference to said plane by an angle less than 90 degrees when forming said recess. 20. Method according to claim 1 or 3, including the step of using a third tool to remove a part of the material of said floor panel at said side edge during a first pre-machining cycle. 21. Method according to claim 1, 3 or 4, including forming said recess with a deepest portion that lies at least partly under the upper lip. 22. Method according to claim 3 or 4, including forming said upper side of said groove with the first one of said two tools.