Abstract: A locking system for mechanical joining of floorboards includes horizontal joining of a first and a second joint edge portion of a first and a second floorboard respectively at a vertical joint plane; vertical joining of the first and second joint edge portions; wherein the tongue, the tongue groove, the locking element and the locking groove have a configuration that allows insertion of the locking element into the locking groove by inward angling of the second floorboard towards the first floorboard while maintaining contact between the joint edge portions, and wherein the tongue, the tongue grove, the locking element and the locking groove have a configuration that allows insertion of the locking element into the locking groove by a substantially vertical snap action.

Abstract: 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.

Abstract: A building frame has multiple bars and two brace assemblies. Each bar is a straight rectangular bar and has a top surface and bottom surface and two mounting surfaces. The mounting surfaces may be indented surface respectively formed in the top and bottom surfaces of the bar. The brace assemblies are parallel with each other and each brace assembly has a primary brace and a secondary brace leant against the primary brace. The primary and secondary braces both have multiple mounting recesses being separately formed therein. Each mounting recess on the primary brace aligns with one mounting recess of the secondary brace. The mounting recesses of the primary brace and secondary brace correspond to and are engaged respectively the mounting surface of the top and bottom surfaces of one bar when the primary and secondary are alternatively moved.

Abstract: 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.

Abstract: Comprising, in principle, tiles consisting of bases made of a plastic material and top plaques joined to the bases, the bases incorporating male and female anchoring elements along their edges which fit together for attaching one tile to another. Characterized in that the anchoring elements are located in the joints between tiles and said anchoring elements are arranged alternatingly along the entire outer edge of the bases, at least by pairs of anchoring elements, one male and the other female, on each side of the edge of the plastic base. The anchoring elements are separated by a distance which is twice the distance between each end anchoring element and the nearest adjacent vertex of the corresponding base. It will thus be possible to place and anchor one tile assembly in relation to another in as many positions as the number of sides of the tiles.

Abstract: 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.

Abstract: 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.

Abstract: A mortarless interlocking building block for a building block system comprising a single light-weight block of the standard building block dimensions molded from plastic and configured to be separable into three-quarter, half and one-quarter sizes for accommodating prescribed wall dimension lengths and openings, including a feature for building interconnecting right-angle walls.

Abstract: In a heliport of the present invention, a plurality of long deck materials are arranged and joined to form a planar member having an approximately plane structure. The planar member is placed on a structure such as a space framework that can float on water, or on another floating structure. The planar member can serve as a top surface of a heliport surface or as a foundation for the heliport.

Abstract: A water-resistant liner insert for a safe is provided. The safe includes top and bottom elements pivotally coupled with one another to define an interior compartment when in a closed position. The liner insert may be coupled with one of the top and bottom elements. The liner insert includes a liner insert body and a resilient gasket. The liner insert body includes a peripheral edge that conforms in shape to interface surfaces on each of the top and bottom elements. The resilient gasket conforms in shape to the peripheral edge of the liner insert body and is coupled with the peripheral edge of the liner insert body. The gasket is configured to be in sealable contact with the interface surfaces of the top and bottom elements when the safe is in the closed position to substantially prevent water from entering the interior compartment of the safe.

Abstract: Floor covering, of the type consisting of oblong, and more particularly rectangular, strip-shaped hard floor panels (2) with a layered structure, which extend in parallel rows, characterized in that it comprises floor panels (2) of at least two different lengths (L1-L2-L3), whereby these different lengths (L1-L2-L3) are realized at the manufacturer's.

Abstract: A construction block for use in the construction of elemental structures, including a body having a bottom surface, a top surface, end surfaces, an outer surface which forms part of an outer surface of a structure and an inner face. At least one formation on or in at least the inner face and/or at least one of the end faces receives and retains at least one insulating element. The insulating element provides thermal insulation for the structure formed from such construction blocks.

Abstract: The present invention is related to an apparatus and method of constructing walls of framed block assemblies including both exterior and interior partition walls which are assembled through an interlocking structure having dovetail tongues interlocked with dovetail channels. Includes are a plain wall, a wall with mortar for ornamentation, and a wall applied with straight longitudinal blocks.

Abstract: The invention relates to a panel element comprising a use side, a counter draw opposite the use side, a first side having a tongue, and a second side, which is opposite the first side and which has a slot that is complementary to the tongue. The tongue has a connecting element, which extends essentially perpendicular to the use side and whose cross-section has a first flank and a second flank that is located opposite the first flank. The cross-section of the connecting element has a center line running perpendicular to the use surface. In a first section (45) of the connecting element (4), when viewing in the direction of the use side (11), the slope of the first flank (41) and of the second flank (42) points outward from the center line (44) and the slope of the second flank (42) points toward the center line (44). The distance between the first flank (41) and the second flank (42) decreases perpendicular to the center line (44).

Abstract: A floor panel including structure for releasably connecting at least two panels. A tongue is formed extending in the longitudinal direction of the side edge and corresponding recess is formed opposite it. The recess comprises a top lip and a bottom lip, and the bottom lip forms a shoulder with a front shoulder side. The shoulder blocks the panels in the transverse direction. An undercut is adjoined by a recess, with a bearing region which corresponds to the shoulder, and a wall, which, with the front shoulder side in the installed state, is located opposite the latter. Form-fitting elements are formed on the wall and the front shoulder side that, in the installed state, engage one inside the other and bring about locking in the vertical direction. An underside of the tongue and a top side of the bottom lip runs parallel to the top side.

Abstract: A two-piece modular floor tile includes a top member formed from wood or stone, and a support member formed from plastic and wood composite material. Each of the top and support members is of substantially rectangular. The support member is adapted to increase air circulation and decrease moisture accumulation, and does not tend to be damaged by rot and termites. In one embodiment, the support member includes a plurality of parallel longitudinal internal channels. In another embodiment, the support member includes a longitudinal projection at one side and a longitudinal mated groove at the other side. In yet another embodiment, the support member includes a plurality of parallel longitudinal bottom troughs. In a further embodiment, the top member includes a plurality of shaped elements secured together.

Abstract: Walls and other structures can be made from blocks assembled from relatively light-weight standard panels that fit together like a puzzle. The blocks are held together without the use of mortar. Each block is formed of six rectangular panels fitted together by sliding capturable elements into cooperating receiving grooves. All of the panels have a common thickness and each panel has two parallel faces. Three types of panels are involved in making the block.

Abstract: A locking system to mechanically joins floorboards together. For horizontal mechanical joining, there is a projecting portion with a locking element which cooperates with a locking groove in an adjacent board. A tongue and groove joint for vertical mechanical joining, has coopering upper abutment surfaces and cooperating lower abutment surfaces which are essentially parallel with the principal plane of the floorboards and of which the lower abutment surfaces are positioned essentially outside the outer vertical plane, i.e. displaced relative to the upper abutment surfaces. The tongue is movable at an angle into the groove and the locking element is insertable into the locking groove by mutual angular movement of the boards about the joint edges.

Abstract: The invention concerns a building system for constructing vertical walls using wooden building blocks. The parallelepiped blocks comprise on their upper and lower surfaces a first groove (5a) extending over the entire length of said surfaces. The ridge between the upper surface and the outer surface of the blocks includes a chamfer (12) folding down part of the first groove over its entire length. The system further comprises a first block aligning tongue (6a) designed to be arranged horizontally between the first grooves of adjacent blocks in the wall. The first tongue includes a double-panel incision. The first panel of the incision is engaged in the first groove, the second panel of the incision is pressed against the chamfers of the blocks. The surface opposite the second panel forms an oblique slope for draining off water.

Abstract: A building element of wood intended to be stacked on top of each other in order to form a wall of a building. The invention is characterised in that the element (1) is longitudinally extended and has a rectangular cross-section, in that the element is designed with a protruding pointed piece (2) at its first end and designed with a point-shaped cavity (3) at its second end, in that the pointed piece (2) and the point-shaped cavity (3) have the same shape such that the pointed piece of a first element fits into the said cavity of a second element, and in that penetrating holes (4) are formed by building elements (1) that lie on top of and adjacent to each other, and in that fixing means (7) are available in order to fix neighbouring building elements to each other.

Abstract: A joint for flat rigid parts comprises projections, which are embodied on the mating sides of the parts in the form of bulbous breadths at the edge thereof and necks at the basis thereof, and complementary joggles, which are embodied in the form of bulbous slots corresponding to the bulbous breadths of the projections and gradually changing into grooves corresponding to the projections necks. The surfaces of the projections edges and the surfaces of the slots bottoms mating therewith are embodied in the form of cones, wherein the peaks of the conical surfaces of the projections edges and of the slats bottoms are arranged an the opposite sides with respect to the connecting parts. The radius of curvature of the guiding lines of the conical surfaces of the projections edges and of the slots bottoms can be embodied in such a way that they tend to infinity; at least one connecting part can be embodied in the form of a through-thickness composite part.

Abstract: The invention relates to a locking system for mechanical joining of floorboards (1, 1?), a floorboard having such a locking system and a flooring made of such floorboards. The locking system has mechanical cooperating means (36, 38; 6, 8, 14) for vertical and horizontal joining of adjoining floorboards. The means for horizontal joining about a vertical plane (F) comprise a locking groove (14) and a locking strip (16) which is located at opposite joint edge portions (4a, 4b) of the floorboard (4). The locking strip (6) projects from the joint plane (F) and has an upwards projecting locking element (8) at its free end. The locking groove (14) is formed in the opposite joint edge portion (4a) of the floorboard at a distance from the joint plane (F). The locking groove (14) and the locking element (8) have operative locking surfaces (10, 11).

Abstract: A connector (15) for connecting modules together comprises plastic connector member (16), an expander rod (17) and a threaded expander rod displacer (18). The connector member (16) has spaced dovetail style enlargements (19) on one side and a full length dovetail enlargement (20) on the other side. The connector member (16) is designed to slide in the confronting slots with the wasted sections (21) of the expander (17) located inside each of the sections (19). Once in position the threaded expander rod displacer (18) is used to axially displace the expander (17) to force the enlarged sections of the expander (17) into the sections (19) thus engaging the slot and at the same time biasing the modules together.

Abstract: The invention is a composite masonry block having a front surface and a back surface which are adjoined by first and second side surfaces, as well as a top surface and a bottom surface. Each of the side surfaces has an inset extending from the block top surface to the block bottom surface. The block top surface has one or more protrusions positioned adjacent the first and second insets on the block top surface. The block also has a protrusion which has an angled side wall, the angle being at least about 20° from vertical. The protrusion is positioned on the block so that it will mate with any opening of an adjacently positioned course. In use, the blocks may be stacked to provide an interlocking structure wherein the protrusions of one block interfit or mate within the insets of another block.

Abstract: A locking system for mechanical joining of floorboards includes horizontal joining of a first and a second joint edge portion of a first and a second floorboard respectively at a vertical joint plane; vertical joining of the first and second joint edge portions; wherein the tongue, the tongue groove, the locking element and the locking groove have a configuration that allows insertion of the locking element into the locking groove by inward angling of the second floorboard towards the first floorboard while maintaining contact between the joint edge portions, and wherein the tongue, the tongue grove, the locking element and the locking groove have a configuration that allows insertion of the locking element into the locking groove by a substantially vertical snap action.

Abstract: A fastening system for panels and trim having a fastening element including a reveal edge and a serpentine edge. A projection and a recess is disposed adjacent to each other on the same serpentine edge. The fastening element guides and connects adjacent panel faces into a flush horizontal alignment with each other. Panels with the fastening element on each side may be combined together in a multiple course structure. The fastening element accommodates dimensional changes in adjacent wood panels from moisture and temperature fluctuations by allowing for expansion both with the elimination of the gap in the serpentine edge expansion area and with the compression of the expansion relief aperture adjacent to the expansion bulge in the recess of the adjacent panel. An expansion relief aperture on the projection of a fastening element can receive a trim fastener for applying perimeter trim with a hidden fastener onto many structurally different panel designs.

Abstract: The present invention is (in some embodiments) a system of decorative siding panels made from high-density expanded polystyrene (EPS) foam, such panels configured for overlapping, having interlocking tongue and groove structure. These panels for covering a surface, such as wall sheathing, of a structure.

Abstract: A cluster of paving elements is formed with a peripheral edge having a re-entrant formation formed between the upper supporting surface and the lower, supported surface. The formation engages a complimentary formation on an adjacent cluster to inhibit relative movement between the clusters. The re-entrant formation may be applied to individual paving elements in the cluster or to the exposed faces of the elements at the periphery of the cluster. The elements in the cluster may be shaped to inter-engage to inhibit relative movement between the elements with in the cluster.

Abstract: A housing structure includes a first plurality of wall panels which form a lower course and a second plurality of wall panels which form an upper course. Each of the wall portions is generally rectangular and includes integrally formed interlocking portions which facilitate attachment of adjacent lateral edges of the wall portions of the first plurality to each other. Integrally formed interlocking portions facilitate attachment of the panels in the lower course to the panels in the upper course. In addition, rectangular roof panels are provided to enclose the housing structure. The interlocking portions enable the panels to slide into an interlocked engagement configuration thereby forming a rigid structure without the need for tools.

Abstract: A vented hollow translucent/transparent plastic block for use in wall construction includes a spectrally selective film laminate disposed therein to define two compartments within the plastic block and to establish an U-factor of 0.35 or less with a S.H.G.C. of 0.39 or less. A vent is disposed in a side wall of the plastic block in fluid communication with each of the compartments to alleviate any pressure increase/decrease within the plastic block and for discharging any condensation within the plastic block that may occur.

Abstract: The invention relates to a system for laying and mechanically joining building panels, especially thin, hard, floating floors. Adjacent joint edges of two panels engage each other to provide a first mechanical connection locking the joint edges in a first direction perpendicular to the principal plane of the panels. In each joint, there is further provided a strip which is integrated with one joint edge and which projects behind the other joint edge. The strip has an upwardly protruding locking element engaging in a locking groove in the rear side of the other joint edge to form a second mechanical connection locking the panels in a second direction parallel to the principal plane of the panels and at right angles to the joint. Both the first and the second mechanical connection allow mutual displacement of joined panels in the direction of the joint.

Abstract: A structural building system including an improved, structural-load-bearing, building component, such as a building panel, having front and back sections, an insulating core, integral symmetrical joinery, a thermal break, and at least one shear resistance connector The panel is asymmetrical about one axis, and is designed to be directionally positioned with respect to the maximum anticipated force. A shear resistance connector array may be positioned between the front and back sections or may be integral to the front or back section. A face sheet may span one or more than one building panel, and provides structural support to the building system.

Abstract: A retaining wall with a series of differently sized, pre-formed blocks. Each block includes a projection and a recess, with the projection and recess arranged and configured so that each projection effectively engages a recess in an adjacent course to connect and align adjacent courses in registry. Retaining walls made of horizontal blocks may be stacked in columnar fashion or running bond fashion. The location of the indexing surface on a projection relative to the viewable surface of the block may be varied to enable adjacent courses to be coplanar or tiered in a variety of predetermined offset distances.

Abstract: The invention relates to a system for laying and mechanically joining building panels, especially thin, hard, floating floors. Adjacent joint edges (3, 4) of two panels (1, 2) engage each other to provide a first mechanical connection locking the joint edges (3, 4) in a first direction (D1) perpendicular to the principal plane of the panels. In each joint, there is further provided a strip (6) which is integrated with one joint edge (3) and which projects behind the other joint edge (4). The strip (6) has an upwardly protruding locking element (8) engaging in a locking groove (14) in the rear side (16) of the other joint edge (4) to form a second mechanical connection locking the panels (1, 2) in a second direction (D2) parallel to the principal plane of the panels and at right angles to the joint. Both the first and the second mechanical connection allow mutual displacement of joined panels (1, 2) in the direction of the joint.

Abstract: 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.

Abstract: The invention relates to a locking system for mechanical joining of floorboards (1, 1?), a floorboard having such a locking system and a flooring made of such floorboards. The locking system has mechanical cooperating means (36, 38; 6, 8, 14) for vertical and horizontal joining of adjoining floorboards. The means for horizontal joining about a vertical plane (F) comprise a locking groove (14) and a locking strip (16) which is located at opposite joint edge portions (4a, 4b) of the floorboard (4). The locking strip (6) projects from the joint plane (F) and has an upwards projecting locking element (8) at its free end. The locking groove (14) is formed in the opposite joint edge portion (4a) of the floorboard at a distance from the joint plane (F). The locking groove (14) and the locking element (8) have operative locking surfaces (10, 11).

Abstract: A concrete retaining wall block provided with integral indicators that indicate the batter that will result from constructing a retaining wall of a multiplicity of the blocks. The indicators for indicating the batter are preferably one or more indentations formed in a surface of the block other than the front surface.

Abstract: A modular building system includes a plurality of extruded plastic beams that are stacked and interlocked using a tongue and groove interengagement. Plastic connecting components are provided for interlocking the horizontal beams to a vertical column.

Abstract: The invention relates to a locking system for mechanical joining of floorboards (1, 1?), a floorboard having such a locking system and a flooring made of such floorboards. The locking system has mechanical cooperating means (36, 38; 6, 8, 14) for vertical and horizontal joining of adjoining floorboards. The means for horizontal joining about a vertical plane (F) comprise a locking groove (14) and a locking strip (16) which is located at opposite joint edge portions (4a, 4b) of the floorboard (4). The locking strip (6) projects from the joint plane (F) and has an upwards projecting locking element (8) at its free end. The locking groove (14) is formed in the opposite joint edge portion (4a) of the floorboard at a distance from the joint plane (F). The locking groove (14) and the locking element (8) have operative locking surfaces (10, 11).

Abstract: The invention relates to a panel element for forming a floor covering, consisting of several identical interconnectable panel elements and having the following features: two first sides of each panel element, called the “longitudinal sides”, these sides having a groove and a tongue; the tongue of a panel element which is positioned at an angle with an installation level of a first, identical panel element can be introduced into the groove of the first panel element; the tongue interacts with the groove of the adjacent, identical panel element in such a way that two interconnected panel elements are protected against separating forces which are exerted along both of the axes extending perpendicularly to the longitudinal side of the panel elements; two second sides of the panel element, called the end sides, are provided with fixing means and a groove and tongue, these forming an end-side connection between two adjacent panel elements; the end-side grooves and tongue can be interconnected by means of the panel

Abstract: 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.

Abstract: A building panel 20 is disclosed which is of sandwich construction having metal sheet structures 21, 22 interconnected by a core 23. The panel 20 includes profiled edge regions 24, 25 enabling the panel to interlock with a like panel. In one form a paper covering 27 is bonded to the metal sheet structure so that panel has a surface characteristic similar to that of plasterboard. A reinforcing element 40 is also disclosed which is arranged to be connected at the joint between abutting panels to improve the load bearing capacity of the panel 20.

Abstract: Device for assembling edges of panels, laths or sheathing includes at least a male part provided on a longitudinal edge and/or a transverse edge of the panels, laths or sheathings and at least a female part of matching shape provided on the other two longitudinal and transverse edges of the panels, laths or sheathings. The device is characterized in that the male and female parts are provided with at least an element for assembling by impact or pressure two consecutive panels, laths or sheathings by their adjacent edges along an oblique direction, the panels, laths or sheathings being initially offset in height and mutually parallel and their male and female parts being then partly mutually engaged. The device is applicable in the building sector, for floor, wall or ceiling finish, in the form of panels, laths or sheathings made of different materials.

Abstract: The invention concerns hard panels for floor coverings, which are provided, at least on two opposite edges, with coupling devices made in one piece with the panels wherein similar panels may be coupled together to form a floor covering, wherein these coupling devices provide for an interlocking in a direction perpendicular to the plane of coupled panels, as well as in a direction perpendicular to the edges concerned and parallel to the plane of coupled panels. These coupling devices comprise a tongue and a groove. A lip which is situated on the bottom side of the groove is longer than a lip located on the top side of the groove. The edge which is provided with the tongue is made elastically flexible.

Abstract: An interlockable panel for forming a generally planar surface. Each panel includes a first surface positioned substantially in a plane and a second surface facing opposite the first surface and substantially parallel to and displaced from the first surface. Each surface has a perimeter defined by edges extending between the first and second surfaces. The edges may include male or female edges. Each male edge includes a tongue that extends outwardly from the male edge and a longitudinally extending void that extends inwardly of the tongue. Each female edge includes a groove having a protrusion position within the groove and extending outwardly from the groove generally parallel to the first surface. An adjacent panel may be linked to a fixed panel such that the tongue engages the groove and the protrusion engages the void. The invention also includes a method for assembling a generally planar surface using interlockable panels such as the above-mentioned.

Abstract: Floor covering hard panels having at least on two opposite edges, coupling elements made in one piece with the panels, so that several ones of such panels can be mutually coupled, whereby these coupling elements provide for an interlocking in a direction perpendicular to the plane of the panels, as well as in a direction perpendicular to the edges and parallel to the plane of the panels, and whereby these coupling elements are made such that the panels can be rotated into and/or out of one another at least along the above-mentioned edges. The panels are provided, at least on the above-mentioned edges, near the top side, with a part from which has been removed an amount of material such as by a bevel.

Abstract: A metal sheet pile has an improved joint strength and is suitable for high productivity manufacturing. Right and left end flanges are formed at opposite sides of the rolled steel sheet pile. Joints are formed at edges of the right and left end flanges. Cross-sections of the joints are point-symmetric or line-symmetric, wherein the end flange and the joint are disposed so that a center of point-symmetry of a pair of interfitted joints is located on or near a centerline of the end flange in the thickness direction. Furthermore, the joint has a protrusion for preventing rotation near the border between the joint and the end flange portion.

Abstract: A stackable wall panel assembly including a lower wall panel having a top, a bottom, vertically extending ends and opposite sides and an upper wall panel having a top, a bottom, vertically extending ends and opposite sides. A vertically extending stanchion has a lower end connected to the top of the lower wall panel and an upper end connected to the bottom of the upper wall panel. The bottom of the upper wall panel is spaced from the top of the lower wall panel to form an open space between the upper and lower wall panels. In a preferred embodiment, a rail extends between the stanchions. Also in a preferred embodiment, a cover covers the space formed between the upper and lower wall panels. In another aspect, a second stanchion is connected to the top of the upper wall panel and a second upper wall panel is connected to the top of the second stanchion.

Abstract: This relates to a locking system for mechanical joining of floorboards (1, 1′), a floorboard having such a locking system and a flooring made of such floorboards. The locking system has mechanical cooperating structure (36, 38; 6, 8, 14) for vertical and horizontal joining of adjoining floorboards. The means for horizontal joining about a vertical plane (F) comprise a locking groove (14) and a locking strip (16) which is located at opposite joint edge portions (4a, 4b) of the floorboard (4). The locking strip (6) projects from the joint plane (F) and has an upwards projecting locking element (8) at its free end. The locking groove (14) is formed in the opposite joint edge portion (4a) of the floorboard at a distance from the joint plane (F). The locking groove (14) and the locking element (8) have operative locking surfaces (10, 11).

Abstract: The invention relates to a system for laying and mechanically joining building panels, especially thin, hard, floating floors. Adjacent joint edges (3, 4) of two panels (1, 2) engage each other to provide a first mechanical connection locking the joint edges (3, 4) in a first direction (D1) perpendicular to the principal plane of the panels. In each joint, there is further provided a strip (6) which is integrated with one joint edge (3) and which projects behind the other joint edge (4). The strip (6) has an upwardly protruding locking element (8) engaging in a locking groove (14) in the rear side (16) of the other joint edge (4) to form a second mechanical connection locking the panels (1, 2) in a second direction (D2) parallel to the principal plane of the panels and at right angles to the joint. Both the first and the second mechanical connections allow mutual displacement of joined panels (1, 2) in the direction of the joint.