Patent Application
20200291661
The present invention is related to boards, such as flooring boards, wall boards and ceiling boards and to an assembly of such boards and to a method of manufacturing of such boards.
Boards used in the construction of floors, walls and ceilings are composed of a wide variety of materials, and designed to be joined in wide variety of ways. Floor boards are often made of composite material including multiple layers of different materials. Floor boards are also joined to one another by a wide variety of structures and techniques, including standard tongue and groove connections and more complex and easy-to-use systems that employ adhesives and adhesive tape, snapping connections incorporated into board edges, angling board with interlocking edges, and overlapping edges. Many of the edges are specially designed to achieve objectives relating to strength, minimum visibility of the joint, prevention of ingress of water and dirt, durability, low cost of production and many others objectives.
In the case of flooring, there are two systems of vinyl floating floors that are currently available in the market. These are systems in which locking tongues and locking grooves are machined into the edges of the sheet comprising the flooring board. Problems with this system include the fact that in order to have sufficient room to form a machined vinyl locking tongue and locking groove on opposite edges of the board, the board is required to be quite thick, and vinyl itself is a relatively flexible and deformable material, not well-suited for creating a strong mechanical connection. Another system relies on adhesive strips applied to the underside of adjacent panels. However, these systems do not provide a mechanical connection between boards, they cannot be readily disassembled, and are difficult to install, because once a board is placed on the joining adhesive strip, it is difficult to re-locate.
Another flooring board having locking tongues and locking grooves machined into the edges of the sheet comprising the flooring board is described in WO 2010/087752 and shown in
A further design is shown in
US 2008/0168730 describes and shows in FIG. 9A (
It would be desirable to have a connection system for a polygonal board that combines attractive features such as one or more of universal design suitable for use and adaption to many different materials, each side of one board being connectable to any other side of another board, easy installation, low manufacturing cost, high quality finish, using recyclable materials, variety of sizes and shapes possible, universal manufacturing method, use of a small number of different materials, recyclability.
Embodiments of the invention are particularly suited for boards, such as flooring boards, wall boards and ceiling boards and which are intended to be mechanically joined. These boards can be based on a variety of materials of which plastic or polymeric or elastomeric materials such as PVC or foamed plastics, wood or fibrous material such as solid wood or HDF or MDF. The boards may have a core layer or body of materials such as plastic or polymeric or elastomeric material or wood or fibrous material. To provide a universal connection system it is preferred to avoid the use of manufacturing techniques that are suitable for only one design, e.g. injection moulding of frames, whereby for each size of frame another mould is required. The present invention makes use of machining which can be adapted to a variety of materials.
The present invention is particularly suited for floating floors, i.e. floors that can move in relation to the base on which they are laid. However, it should be emphasized that the invention can be used on all types of existing hard floors, such as homogeneous wooden floors, wooden floors with a lamellar core or plywood core, cores made of particle board, floors with a surface of veneer and a core of wood fiber, thin laminate floors, and the like. The invention can also be used in other types of floorboards which can be machined with cutting tools, such as subfloors of plywood or particle board. Even if it is not preferred, the floorboards can be fixed to the floor.
A purpose of embodiments of the present invention is the construction of a board with connection elements and the edges whereby the boards as made by machining a core layer, i.e. a core layer having one or more coextensive layers of material.
A purpose of the present invention is to provide an easy-to-lay composite floor board that is not wasteful of material, can be made with conventional manufacturing tools and hence requiring limited investment in the required equipment, and being manufacturable in several varieties having different functions. The connection design on the edges of the board can be applied or adapted to many different materials. Embodiments of the present invention allow sliding tessellation, i.e. sliding or snapping connection between any two sides of two different boards. A tessellation of a flat surface is the tiling of a plane using one or more geometric shapes, e.g. usually called tiles and called boards in this application, with no overlaps and no gaps. Embodiments of the present invention can provide adaption to different materials such as strengthening of tongues used for hooking or latching or provide means of strengthening of tongues used for latching to compensate for mechanical weakness induced by machining steps such as the machining of continuous or discrete grooves. Also different designs of tongue, e.g. width and shape can be used to vary the strength and ease of locking two boards together.
In particular the boards according to embodiments of the present invention are combinable to allow patterns to be formed which have connections on each edge of the board, which connections can be completed by sliding the boards together rather than by angling the boards although the latter is possible. Also, in accordance with embodiments of the present invention any one side can be connectable to any other side of an adjacent board, i.e. the same connection design can be used on each side. Such connections differ from the more conventional asymmetrical design where the connection on one side is complementary to the system on the side of another board with which it is joined.
Embodiments of the present invention do not need to use an asymmetrical tongue and groove arrangement for horizontal locking whereby a tongue protrudes from the side edge surface of one board and fits into a matching groove on the side edge surface of an adjacent board. Side edge grooves require an increase in the thickness of material that must be used for the board or reduce the strength of the board or of the tongues. For example in embodiments of the present invention the tongues of two adjacent boards form a construction like interlocking fingers which provide both the vertical and horizontal locking. The tongues of one board pass underneath an adjacent board.
Embodiments of the present invention are made from flat uniform boards and are not constructed from multiple components fixed or glued together. Embodiments of the present invention are frameless boards.
Embodiments of the present invention relate to a construction and a method of construction of such boards, e.g. floor boards, that have a peripheral connection arrangement for interconnecting of one board to another, a core layer e.g. made from a plastic or polymer or elastomer or wood or fibre based material or other suitable material.
The boards may be of multilayer construction. The core layer may comprise one or more layers including top layers. These top layers may be decorative and may include or provide a wear layer. The top or surface layer can be made, for example of a material selected from the group consisting of: a vinyl sheet, woven vinyl, carpet, high pressure laminate, direct pressure laminate, a ceramic tile, needle felt, wood, paper, printed or non-printed plastic material. In embodiments of the present invention the edges and edge faces and the abutment surfaces of the core layer are formed by machining. The core layer can be made of plastic, rubber, wood or a fibre based material such as solid wood, HDF or MDF for example.
The core layer may also comprise a bottom layer on the underside of the board and can be designed to be in contact with the floor or an underlay can be applied when in use. The bottom layer can co-operate with other layers of the core layer such as the top layer to provide a balanced board that remains flat and does not warp to an appreciable extent. Accordingly the raw material, the plank from which the finished board is machined can be a single layer or a multilayer construction whereby the layers of the plank are coextensive.
The present invention also includes an assembly of boards according to any of the embodiments of the present invention, the assembly being a tessellation.
The connection units on each or every edge of the board can be made by machining.
This machining comprises in embodiments of the present invention:
a) Machining a recess in the underside of the board and located a distance in-board of each edge of the board, either continuously or intermittently.
b) Machining the shape of a tongue into the upper surface of the board along the edges. The shape of the tongue may depend upon the material of the board c) Isolating individual tongues by machining away intermediate sections between the machined tongue shapes.
The repetition distance R of the tongues is given by (see
R=(2·r·Vpi)/(n·VC)
Each machining step may comprise a plurality of partial machining steps. Breaking each machining step into a plurality of shallow machining steps reduces the force applied to the board in each step.
The machining steps may be performed with the board static or moving. If the board is moving, step c) may be carried out by a machining aggregate that comprises a turret with rotating machining tools. The rotation of the turret can be synchronised with the line speed of movement of the board and can be continuous or non-continuous. The effective speed in the direction of the movement of the board as a result of the rotational speed of the turret may be the same or different from the speed of the board in that direction. The rotation of each machine tool about its own axis is preferably independent of the rotation of the turret itself so that the machining tools preferably have their own independent drive(s). This allows optimised rotation speed for the tool and material to be machined.
The repetition distance of the tongues isolated in step c) also depends on the distance between the board and the centre of the turret and on the respective velocities of the board and the machining tool. The choice of the number of machine tools on the turret will depend upon the repetition distance and the size of the machining tools that fit practically into a profiling line. The width of each tongue is the repetition distance minus gap (dimension “S”) cut out by the machine tool. The dimension “S” depends on the dimension of the machine tool, the position of the machine tool on the turret branch, the distance to the board and the synchronisation between the turret and the board. The distance to the board, size and position of machine tool and synchronisation are preferably optimized in order to get as close as possible to a rectangular cut out of the tongue section of the board. The machine tools may cut at an angle with respect to the plane of the board.
The width of the tongues when isolated is smaller than the size of the space between adjacent tongues and is preferably chosen such that any edge of the board can be connected to any other edge of an adjacent board. When the tongues extend laterally from the lower edges of the core layer by a distance “t”, and the tongues have a width T and are separated by spaces of length S and the shortest distance from an edge to the last tongue on one side is dimension “d”, then in any embodiment of the present invention:
S>T
In some embodiments of the present invention the following inequality can apply (to allow various different possibilities for arranging the boards):
S>T+2t+d.
Preferably the space between two tongues is S and the distance of the edge of the last tongue on one side of the board is d whereby the edge of the tongue adjacent to the same corner but on another and adjacent side of the board is a distance S−d from that corner.
The machining processes can be carried out directly onto the board material without there being undercuts, i.e. recessed or overhanging portions but the present invention does not exclude the use of a multiple of machining tools which thereby allow a wide range of designs.
A board according to embodiments of the present invention can have a variety of attributes, each of which can be provided or some or all of which can be provided, e.g. any combination of these attributes can be provided in embodiments of the present invention. A selection of these separate but combinable attributes include:
a) Ease of laying.
b) The board has the shape of a tiling polygonal such as a square, a rectangle or oblong, a parallelogram, a hexagon or one eighth segment of a hexagon. The board may have two sets of two sides, each set having the same or a different length. A pattern of the flooring can be generated using sliding tessellation of the boards. This attribute allows laying patterns such as tessellations that support rotational symmetry or non-symmetry in the shape or pattern on each board as well as other transformations such that a wide variety of tiled patterns or tessellations are possible. A tessellation or tiling of a plane surface is a pattern of plane figures that fills the plane with no overlaps and no gaps. For example, copies of an arbitrary four sided figure such as a quadrilateral can form a tessellation with 2-fold rotational centres at the midpoints of all sides, and translational symmetry whose basis vectors are the diagonal of the quadrilateral or, equivalently, one of these and the sum or difference of the two. Tessellated flooring patterns such as square or quadrille, truncated square or truncated quadrille, deltoid trihexagonal or tetrille, truncated trihexagonal or truncated hexatetrille tilings are all included within the scope of the present invention.
c) A connection arrangement is provided on each of the sides, e.g. on each of the three, four, five or six sides of the core layer that can be used to join any side of one board to any side of another board.
d) The boards that are joined together can be identical or can be different but adapted in such a way that they are able to be tiled together. For example, a four sided floor board may be combined with similar boards or dissimilar boards to tile a plane surface such as a floor. The present invention includes combinations of floor boards which include at least one four sided floor board according to an embodiment of the present invention.
e) Embodiments of the floor boards according to the present invention also can be adapted to have good acoustic properties.
f) The connection arrangement should be makeable between adjacent boards by means of sliding and latching the boards together without the need to angle the boards. This allows a forming a flooring by sliding tessellation, for example using floor tiles.
g) The connection arrangement between the boards can also be optionally so constructed that the one board can be displaced (to a certain degree) in the direction of the mating edges of the two boards when the two boards are connected together. This allows adjustment of the relative positions of the two boards during laying, e.g. to align a pattern in the top decorative layer of adjacent boards.
h) In embodiments of the present invention the materials, shape and thicknesses of the all
the layers of the board can be selected so that no part of the board telegraphs through to the top layer.
i) In embodiments of the present invention the material of the core layer and its thickness can be selected so that an unevenness of the floor does not telegraph through to the top layer.
j) The construction and method of manufacture of the floor boards of embodiments of the present invention include machining steps, e.g. to form the abutment surfaces where two boards are joined. The use of machining makes the connection system of the present invention universally applicable to different materials. Machining steps can weaken some materials and embodiments of the present invention provide inherently stronger parts such as hooking or latching tongues or means for strengthening certain parts such as hooking tongues. Embodiments of the present do not use methods that are limited to unique sizes such as moulding techniques which produced products limited to the dimensions of the mould. Embodiments of the present do not use methods that are limited to specific materials, e.g. injection moulding which requires plastic materials with a specific melt flow index MFI so that they can be moulded.
k) The connection arrangement of embodiments of the present invention can join the boards tightly and firmly without the use of adhesive, nails or screws or of angling the boards during installation.
l) Only relatively few materials, need to be used to make each board and these materials can be selected to be recyclable.
Embodiments of the present invention provide a polygonal board having a core layer with an underside, a topside and edges and edge faces, the core layer having a plurality of staggered hooking tongues extending outwardly from the edges of the core layer; the core layer of one board having at least two recesses formed in its underside on two sides for engaging with hooking tongues of another board, the hooking tongues and the at least two recesses of each board being arranged to allow sliding mating of the tongues of a first board with the recesses of a second adjacent board and with the recesses of a third adjacent board thereby forming an abutment surface in the joint between the first board and the second board and between the first and third boards, the at least two recesses being made by machining, the tongues and recesses of adjacent boards co-operating to provide both vertical and locking engagement of the two boards.
In particular the staggered tongues are preferably isolated from each other by machining.
A floor board according to embodiments of the present invention has an openable, closing or locking board connection system. The floor board can have an intermittent or continuous recess or groove or channel on the underside of one or more, preferably each edge of the floor board as well as spaced projecting tongues on each same edge as the recess(es). The tongues are formed in a staggered manner to be brought together with recesses in a closing or locking action in a form of interlocking fingers. Optionally the boards are dismountable by an angling motion. The tongues and recess of such a locking system can be produced by means of machining or shaping tools such as by milling. In particular the intermittent or continuous recess and the tongues can be made by machining. Hence the connection method is independent of the materials used. The tongues and the recesses of each board are preferably arranged to allow engagement of the tongues of a first board with the recess of a second adjacent board and the formation of an abutment surface in the joint between the first board and the second board. The connection system of embodiments is adapted to allow two adjacent sides of one board to be connected to sides of other boards by sliding and without the need for angling of any of the boards.
For sliding connection the tongues can have some flexibility or can be flexible in an elastic manner so that the tongues can deflect and ride under or over a locking element or bar on the recesses of an adjacent board. Such flexibility in the tongue can result in damage when the material used is weak, brittle or likely to delaminate. Some fibrous board materials exhibit this property especially after machining, e.g. machining of the intermittent or continuous recess or machining of protruding tongues.
In accordance with some embodiments of the present invention, the board design preferably includes a means for strengthening the root of each tongue. This is useful because the laying process of sliding latching requires some deflection of each tongue as it slides underneath an adjacent board and then latches into a recess to form the interlaced finger construction. This requires a flexing of the tongue and if this is mechanically too weak it can break or split. Hence each tongue must be long enough to latch into the corresponding recess, and strong enough but also flexible enough to latch without damage. A continuous recess placed inboard of the tongue root can weaken the tongue, e.g. if the recess is close to the tongue root the sheer strength can be reduced.
A variety of designs can be produced efficiently by machining. To provide a means for strengthening the root, in one embodiment the abutment surface has a sloping section that extends over a distance of at least 10% of the thickness of the board. The strengthening can be increased by the sloping section extending over at least 20%>, 30%>, 40%>, 50%> up to about 60% of the thickness. The sloping section extend horizontally at least 10% of the length of the tongue. To increase the sheer strength the sloping section can extend over at least 20%, 30%, 40%, 50% up to at least 60% of the length of the tongue. The sloping section can be at an angle of at least 10°, 20° or 40° plus or minus 10° or plus or minus 5° or up to 60°. The profile of the counterpart board must be adapted in order to allow a correct assembly. The advantage of this arrangement is the strengthening of the root of the tongues. But this will also make the tongue more rigid. If the material used for the board is rather flexible or rubber-like (such as an impact resistant plastic) this can be an advantage.
In another embodiment, the means for strengthening is provided by intermittent recesses such as discrete grooves or channels arranged so that there is no recess behind a tongue, i.e. in-board of the tongue there is no recess.
In another embodiment, the means for strengthening is provided by the material used for the tongue, e.g. the board is made of an elastic material such as a polymeric, elastomeric or plastic material such as PVC which can be foamed for example.
In another embodiment, the means for strengthening is provided by a coating on the underside of the tongues, e.g. a layer of plastic or resin such as fibre reinforced plastic or resin.
The machining techniques for use with the present invention such as milling, grinding, sawing or laser cutting or ablation can be adapted to many different materials. The machining techniques in accordance with embodiments of the present invention are adapted so that the reference dimension is from the top surface of the board. This has the advantage that the top surfaces of adjacent boards are at the same height.
The present invention provides in one aspect an easy -to-lay floor board, characterized in that it comprises a polygonal tiling, e.g. a three-, four-, or six-sided core layer and optionally a decoration layer fixed on or in the surface of the core layer, the core layer having or comprising latching or hooking tongues provided on the external edges of the core layer and catches, e.g. at least one recess or some recesses such as grooves or channels provided on the underside of edges of the core layer. Tongues and the at least one recess on each edge of each board are arranged to allow engagement of the tongues of a first board with the at least one recess of a second adjacent board (and vice versa) and preferably also with the at least one recess of a third adjacent board (and vice versa) with the formation of an abutment surface in the joint between the first board and the second board and between the first and third board. The at least one recess is preferably formed by machining. For a set of boards, preferably any side of any board can lock with any side of any other board.
The hooking tongue can have a rectangular, square, trapezoidal, or a radiused version thereof or semicircular, spoon or spatula shape when viewed from above, and is provided at intervals on the outer edges of the core layer. The shape is determined by the shape and the setup of the machining tools used as is described later. Each edge of a board is preferably prepared in a similar manner so that adjacent to, i.e. on at least one side of a tongue, a recess is provided, each recess forming a catch and having a shape corresponding to a lip or head of the square, rectangular, or a radiused version thereof or half-circular or spoon or spatula shaped hooking tongues and being provided on the underside of the outer edges of the core layer. The recesses are at least located beside or between the rectangular-shaped hooking tongues; the positions of the rectangular, square, or a radiused version thereof, or semi-circular, or spoon or spatula shaped hooking tongues on one outer edge of the core layer being arranged in a staggered manner, while the positions of the recesses on one outer edge of the core layer can be arranged in a staggered or continuous manner.
Such hooking tongues in accordance with embodiments of the present invention can be, provided at intervals on the outer edges of the core layer, each recess of at least two recesses corresponding in shape to the square- or rectangular-shaped tongues and being provided on the underside of the outer edges of the core layer beside the tongue. The distance from the inner side of the tongue head of the tongue to the edge of the core layer is equal to the distance from the inner side of the head of the recess to the edge of the core layer. These feature provides locking.
A tongue may have a tongue head with a distal and a proximal sides or edges. The distance from the proximal or inner side or edge of the tongue head of the hooking tongue to the edge of the core layer is preferably equal to the distance from an inner side of the recess to the edge of the core layer.
In particular the board can be an easy-to-lay floor board, comprising a four-sided core layer and a four-sided surface layer fixed and connected to the core layer, characterized in that the core layer comprises rectangular-shaped hooking tongues that are provided on the edges of the core layer; each edge of the core layer being uniformly provided with several rectangular-shaped hooking tongues; the underside of the edge of the core layer being provided with recesses beside the hooking tongues, corresponding to the hooking tongues; the positions of the hooking tongues on two edges of the core layer and the positions of the hooking tongues on two other edges of the core layer being arranged in a staggered manner, and the positions of the recesses on two edges of the core layer and the positions of the recesses on two other edges of the core layer being arranged in a staggered manner.
A number of different embodiments are described herein, and a number of different optional or preferred features are described. Unless otherwise stated, an optional or preferred individual feature or optional or preferred combination of features for any embodiment may be applied to any other embodiment described herein, unless otherwise stated or obviously incompatible.
Compared to existing techniques, embodiments of the present invention, especially those with inline machining, have at least one of the following advantages : a lower manufacture cost, lower equipment investment, a stable quality and is versatile in use.
Further details are disclosed in the appended claims each of which defines an embodiment of the present invention.
“Tessellation” is the process of creating a two-dimensional plane using the repetition of a geometric shape with no overlaps and no gaps. The present invention provides floor boards that can be tessellated with any form of tessellation as described below. A regular tessellation is a highly symmetric tessellation made up of congruent regular polygons. Only three regular tessellations exist: those made up of equilateral triangles, squares or hexagons. A semi-regular tessellation uses a variety of regular polygons, of which there are eight. The arrangement of polygons at every vertex point is identical. An edge-to-edge tessellation is even less regular: the only requirement is that adjacent tiles only share full sides, i.e., no tile shares a partial side with any other tile. Other types of tessellations exist, depending on types of figures and types of pattern. There are regular versus irregular, periodic versus non-periodic, symmetric versus asymmetric, and fractal tessellations, as well as other classifications. For practical reasons it preferred if the floor boards as used with the present invention are tiles that can be tessellated with three, four, five or six sides or combinations of these.
“Sliding tessellation” in accordance with this application refers to the shape and construction of hooking tongues and recesses on each side of a tillable polygonal board such that a tessellated pattern can be produced by sliding latching of each board with respect to other boards of the pattern. Sliding tessellation is hard to be performed only by an angled connection with a rotational movement to lower one edge of one board vertically to engage with an edge of another board. For easy assembling one sliding motion is generally required and it is a particular advantage of embodiments of the present invention that sliding tessellation can be achieved easily and within the capabilities of an average installer. The present invention does not exclude an angling operation to join one side of a board to another. Also one edge of an already laid board may be lifted to allow the tongues of another board to be slipped underneath.
Directional terms are used herein to describe the relative positioning and configuration of various components on the board. The directions are given on the basis of a board resting on a floor, with the catches (e.g. recess having a locking edge, as described herein) on its underside, as described herein, and/or such that the decoration or surface board is located above the core layer. In use, however, the board may be used in any position, e.g. on a sloped floor, a wall or ceiling, as the skilled person would appreciate. The term “Tongue” refers to a protrusion from a side edge of a flat board. At the end of the tongue, i.e. the distal end from the board a protrusion is provided for latching into a recess on the underside of an adjacent board.
The term “recess” refers to an elongate cavity that co-operates with a tongue from an adjacent board to provide horizontal locking. Multiple interlocking tongues on both mating edges to two adjacent boards provide vertical locking.
Tongues co-operate with recesses to create a connection with horizontal and vertical locking while maintaining adjacent boards in the same plane. That is the top and bottom surfaces of adjacent boards are flush with each other.
The term “machining” relates to any of various processes in which a material is subject to a controllable material removal process. The term machining as used in this invention relates mainly to subtract! ve manufacturing.
Machining may include milling, sawing, shaping, planing, grinding or other material removal processes. These processes can involve the use of a sharp cutting tool to remove material to achieve a desired geometry. However the term machining also includes laser cutting or ablation.
Machining may be carried out by computer numerical control (CNC), in which computers are used to control the movement and operation of the machining tools.
The inventions set forth herein are described with reference to the above-described drawings and some specific examples or embodiments. The embodiments described are merely exemplary of the many variations that will be apparent to those skilled in the art.
A construction and methods of assembly and construction of boards, e.g. floor boards, are described which can be applied to a large number of different board designs. The boards have a peripheral connection arrangement for interconnecting of one board to another, a core layer e.g. made from plastic or polymeric material or a wood or fibre based material or other suitable material and a top layer integral with or applied to the core layer which may be decorative and may include or provide a wear layer. A further bottom layer may be integral with or applied to the underside of the core layer and is designed to be in contact with the floor or an underlay can be applied when in use. The bottom layer may also act as a balancing layer, i.e. to keep boards flat and preventing bowing. The connection arrangement includes interconnecting hooking tongues and a corresponding recess or recesses. The tongues can be reinforced with a substantial root section to provide improved resistance to bending forces. This stronger root section can be provided by the use of discrete recesses whereby the recesses are only adjacent to a tongue and not at the tongue position.
Embodiments described herein comprise a core layer. Optionally, a core layer includes, but is not limited to, a layer that acts to provide structural stability to the floor board. The core layer may be a multilayer but is preferably an integral, i.e. it is made of one piece of material. The material from the core layer can be made of fibres or other discrete components that are formed together into a single piece. The core layer may act to support a further component or components of the board thereon, for example the decoration or surface layer described herein and/or the core layer may act to provide sufficient lateral strength and stability, i.e. in a plane of the board, as required to ensure the board cannot be compressed or otherwise distorted to any great extent, if at all, in normal use, e.g. when engaging with other boards and/or once in place as a floor board, if used for this purpose. The layer disposed on the core layer may be termed a decoration layer or a surface layer herein. Optionally, a decoration layer includes, but is not limited to, a layer displaying a decoration or a layer on which a decoration could be displayed.
Optionally, the decoration shown may, for example, be selected from lines, colours, contours, shape, texture, materials from which the decoration layer is made, and any ornamentation present thereon. For example, the colour may be a colour of the material that is used to form the decoration layer, or any visible part thereof, or a colour printed on the board. Optionally, a surface layer includes, but is not limited to, a layer having an exposed upper surface.
Optionally the decoration layer, may, itself, be a flexible body, i.e. not necessarily rigid when separated from or attached to the core layer.
In addition a bottom or balancing layer(s) may be applied. This may be a paper layer and is used to strengthen the board and to prevent warping.
In all of the embodiments of the present invention hooking tongues can slide beneath an adjacent board and the tip of the tongue locates in a recess in the adjacent board. Each edge of the board has both a recess or recesses and spaced apart tongues with the recess or recesses arranged between the tongues so that tongues of one board locate in a recess or recesses of the adjacent board and vice versa. All of the embodiments of the present invention allow sliding tessellation, i.e. allow joining of one board to two other boards in any orientation in a tiled pattern with no overlap or spaces.
As described herein, embodiments comprise interlocking or hooking tongues and recesses. The hooking tongues and recesses on a board preferably cooperate such that a hooking tongue on one board can engage with, e.g. latch into, a recess on another board of the same or different configuration to prevent boards being separated laterally, i.e. in the same plane as the boards. The tongues and recesses are preferably adapted so that they latch together by a flat sliding motion rather than requiring the need to angle one of the boards. Also the hooking tongues and their matching recesses are preferably designed so that two adjacent sides of the one board are slidably connectable to two other boards. The hooking tongues on a board are optionally generally planar hooking tongues, generally provided with one or more features, e.g. vertical protrusions or projections, that allow them to engage with the recesses. Such a hooking tongue may be a tongue that has two substantially flat opposing surfaces and may be of a regular shape when viewed from above the board having the tongue; such regular shape may selected from rectangular or square, for example.
In any embodiment, the core layer can comprise a wood material, e.g., of solid wood or a wood fibre material from a very wide range of developments, for example, a particle board, however preferably an MDF board or an HDF board. The core layer is that portion of the floor board that makes the prominent contribution towards the total thickness of the floor board and that ensures the torsional stiffness and/or flexural strength of the floor board. For this reason, the core layer is that layer of a floor board with the greatest thickness.
In any embodiment, the core layer can comprise a polymeric, elastomeric or plastic material such as PVC.
In all of the figures “P” refers to the top plane of the board which is the reference plane for measurements and this plane “P” is the reference plane used to define how deeply any machining tool goes into the material of the board.
The core layer 1 in
In
S>T
In embodiments of the present invention the following inequality can apply (to provide various different mutual arrangements of the boards):
S>T+2t+d.
This is generally the minimum size of S in order to be capable of assembling one side of one board to all other sides of another board in any pattern without using “angling” laying techniques.
The spacing between tongues is the dimension S. At the corners of the board the distance of the end of one tongue to the corner is “d”. In this case the distance from the corner to the next tongue on the following edge is S−d. Thus the distance between any two tongues along the edges is “S” independent of whether the tongues are on the long side, the short side or whether the space S is spread over two edges.
The total thickness of the board 8 can, as is customary for floor panels, be roughly 4 to 11 mm, but can also be thicker, for example, 11 to 15 mm, or thinner 2.5 to 4 mm. The thickness of the core layer can essentially correspond to the thickness of the board, particularly in the case that no additional layers such as noise-protection material are used and if the surface layer is only fractions of a millimeter thick. Preferably the thickness of the core layer is 2 to 10 mm, for example 3 to 8 mm. Preferably, such floor boards have a width between 10 cm andIOO cm, a length between 0.3 m and 2.5 m. The size is generally limited by practical handling limitations otherwise there is no particular limit on size.
At the root of the tongue 5, where the inclined surface 14 merges into the core layer 1, a vertical surface 13 is provided which forms an upper abutment surface when two boards are joined together. This vertical surface 13 may be wholly in the core layer or may be wholly or partly in a decoration, tread or top surface layer 23. On the upper edge of the abutment a bevel 27 may be provided. This bevel 27 may be wholly in the core layer or may be wholly or partly in a decoration, tread or top surface layer 23.
The tongue 5 upper shape is preferably obtained by machining along the complete length of the edge of the board 8 as indicated by the arrow XI. XI indicates the movement of a suitable tool such as a milling tool that is used to form the upper surface shape of the tongue 5 by machining as is described later with reference to
The tongues are isolated from each other by the distance S shown in
A recess 6 in the form of a channel is disposed inwardly of the base 19 of the tongue 5. Due to the fact that this recess 6 is on the underside of the board (rather than on a side abutment surface), the hooking tongue 5 has to extend underneath an adjacent board. The length of tongue can result in a weakness to bending forces during installation or transport. Thus the inclined surface 14 provides a significant strengthening factor for the longer tongue 5 especially when the core layer is made of a wood-based or fibre-based material such as MDF or HDF. The recess 6 is visible in
The inclination of the surface 21 may be 10 to 60°, e.g. 20°, 30°, 40°, 50°, 60° plus or minus 10° or plus or minus 5° to the horizontal. Although shown as straight, the surface 21 can be curved. It should be noted that surfaces 14 and 21 should be preferably at the same angle to the horizontal, and the orientation of those abutment surfaces may be varied to make it easier or more difficult to disengage joined panels or boards. In particular when two boards are assembled it is preferred if there is a slight gap between the surfaces 14 and 21 of the order of 0.05 or 0.1 to 0.5 mm or more so that these surfaces do not meet before the surface 16 has locked behind the surface 24.
At the top end of inclined surface 21 a vertical surface 29 is provided which forms an upper abutment surface when two boards are joined together. This vertical surface 29 may be wholly in the core layer or may be wholly or partly in a decoration, tread or top surface layer 23. On the upper edge of the abutment a bevel 27 may be provided. This bevel 27 may be wholly in the core layer or may be wholly or partly in a decoration, tread or top surface layer 23.
Optionally the recess 6 has a top surface (or ceiling) 25 adapted to accommodate the nose of the projection 17 on the tip of a tongue during the locking process when adjacent boards are joined together. The top surface 25 may be flat (as shown) or curved and can be horizontal or inclined. The recess 6 may also have a generally vertical back wall 26. The bottom of the back wall 26 may also be bevelled or rounded. The surface 24 should preferably match the surface 16 of
In
Dimension A+B is approximately the transverse cross-sectional length of the locking edge 22 that is received by the space defined by top surfaces of the intermediate section 18. The relationship between A and B may be varied along with other factors such as the frictional properties of the materials used, and the extent to which flexible or pliable materials are used, both in the manufacture of the core layer and in the manufacture of the decoration or surface layer 3. Depending on the importance of having a gap-free joint and possibly on the importance of having panels or boards that are able to be displaced and/or disassembled dimension A may be greater than, equal to, or less than B. The ratios of A:B:C can be for example, 1:2:3 or 1:3:4 or in general 1:X:X+1 where X can lie between 1.5 and 5.
The dimension B+C is an indicator for the sheer strength between the tongue 5 and the recess 6. Strengthening the root by a sloping section is limited by the thickness E of the core layer. Hence these dimensions determine how strong the root of the projecting hooking tongue is. For maximum strength the root has a thickness close to the thickness of core layer which then tapers gracefully to the tip of the tongue. This increases stiffness however.
In embodiments of the present invention, the ratio of the dimension F to E can be in the range 0.3 to 0.7, e.g. 0.4 to 0.6. The ratio of the dimension G to the dimension E can be 0.6 to 1.8 e.g. 0.8 to 1.4.
The adhesive layer 28 should be elastic and should preferably be more elastic than the material of the core layer. A number of adhesives that are suitable for connecting surfaces made of wood or wood materials are suitable for use as the adhesive layer 28. These are, for example, hot-melt adhesives such as are used, for example, for gluing veneers, dispersion adhesives or solvent adhesives (e.g. casein glue), contact adhesives such as are used, for example, for particle boards or hardboards, glues such as, for example, joiner's glue such as is conventionally used for wooden joints, or reactive adhesives, e.g., multi-component adhesives based on epoxy resin, or UF (urea-formaldehyde) resin, MF (melamine formaldehyde) resin, PF (phenol formaldehyde) resin or RF (resorcinol formaldehyde) resin. The adhesive layer 28 can, however, also be applied more thickly, as would be necessary for purely connecting purposes. In addition the adhesive 28 can be used for improving noise propagation.
The core layer can be made of a plastic or polymer material such as vinyl. The decoration or surface board 23 can be a decorative vinyl flooring sheet. Where there are multiple layers these may be laminated or fixed to each other by any suitable means such as glue, pressure, extrusion, casting etc. Such a vinyl flooring sheet preferably has an embossed upper layer made of a vinyl chloride-containing polymer or a PVC-free floor covering vinyl polymer material and eventually equipped with a protective coat of a polymer adhering to said vinyl chloride-containing polymer or PVC-free floor covering vinyl polymer material.
Examples of suitable vinyl chloride-containing polymers for the vinyl flooring sheet of the decoration or surface layer 23 include any such vinyl polymer having the desirable combination of properties like flexibility, resistance to walking, ease of cleaning and the like. These include homopolymers and copolymers of vinyl chloride.
Examples of suitable PVC-free floor covering vinyl polymer materials for the vinyl flooring sheet of the decoration or surface layer 23 include, but are not limited to, polyethylene, polypropylene, ethylene-vinyl acetate copolymers of low density or very low density having the desirable combination of properties like flexibility, resistance to walking, ease of cleaning and the like. These include ethylene-vinyl acetate copolymers with a melt index between 0.3 and 8.0 g/10 min (190° C./2.16 according to DIN 53 73) as described for instance in EP-0 528 194-B. Other floor covering vinyl polymer materials are described in U.S. Pat. Nos. 6,287,706, 5,458,953, EP 0603310-B and EP 0528194-B, the content of which is hereby incorporated by reference.
The protective coat of a polymer adhesive to said vinyl chloride-containing polymer or PVC-free floor covering vinyl polymer material may be made of any coating material having the desirable combination of properties like glass transition temperature, elongation at break, and tensile strength, such as, but not limited to, polyurethane or polyacrylate lacquers.
The vinyl chloride-containing polymer or PVC-free floor covering vinyl polymer material may further comprise one or more organic or inorganic additives known in the art, and/or one or more intermediate support or carrying layers made of PVC or PVC-free polymer materials, including reinforcement in the form of glass fibers, or other non-woven systems, or by using cross directional layers of PVC or PVC-free polymer materials for stabilisation, and a bottom surface layer made of PVC or PVC-free polymer materials.
The top surface layer 23 may extend beyond the perimeter of the core layer 1, and can be varied, such that a joint made with boards can be made more or less tight, depending on particular design objectives. Other factors are such as whether the boards are made such that the decoration or surface board is laterally larger than the core layer 1, whether the core layer is made from a material that has flexibility, and whether it is required that the boards be displaceable along their joined edges.
The tongue 5 of this embodiment is preferably machined along the complete length of the edge of the board 8 as indicated by the arrow XI which indicates the movement of a suitable tool such as a milling tool that forms the upper surface shape of the tongue 5 by machining and which is described with reference to
In the embodiment of
In the embodiment of
In particular when two boards are assembled it is preferred if there is a slight gap between the surfaces 14 and 21 of the order of 0.05 or 0.1 to 0.5 mm or more so that these surfaces do not meet before the surface 16 has locked behind the surface 24.
Above surface 21 a vertical surface 29 is provided which forms an upper abutment surface when two boards are joined together. This vertical surface 29 may be wholly in the core layer or may be wholly or partly in a decoration, tread or top surface layer 23. On the upper edge of the abutment a bevel 27 may be provided. This bevel 27 may be wholly in the core layer or may be wholly or partly in a decoration, tread or top surface layer 23.
Optionally the recess 6 has a top surface (or ceiling) 25 adapted to accommodate the nose of the projection 17 on the tip of a tongue during the locking process when adjacent boards are joined together. The top surface 25 may be flat (as shown) or curved and can be horizontal or inclined. The recess 6 may also have a generally vertical back wall 26. The bottom of the back wall 26 may also be bevelled or rounded.
With respect to any of the embodiments described with reference to
In
Suitable production methods are known, for example machining and using tools to form the shapes described above for the hooking tongue and recesses in for example wood materials, wood-based boards and fibre-based materials, plastics or elastomers, or composite materials and that this type of machining can be made in a tongue or recess. As described above, embodiments of the present invention provide a combination of the design of the joint system with, for instance, specific angles, radii, play, free surfaces and ratios between the different parts of the system, and optimal utilization of the material properties of the core layer, such as compression, elongation, bending, tensile strength and compressive strength.
Machining of the edge surface which can be used in any of the embodiments of the present invention will now be described with reference to
To machine the upper surface of tongue 5 a machining station 50 is provided. Such a station 50 may include one or more machining tools 52 which may be rotating tools such as a milling tool. The machining tool 52 may be mounted on a cylinder or other position controlling device 56 which allows the exact position of the machining tool 52 particularly with respect to the top surface of the board 8. The machining tool 52 may be controlled and optionally powered from a controller 58 for instance to provide a low latency in control signals. To position the machining tool 52 accurately with respect to the upper surface of the board 8, optional guides 53 and 54 can be used which may be in the form of encoders, e.g. to provide a position and speed value for the movement of the board 8. The guides 53 and 54 may not only determine the depth of penetration of the machining tool 52 but may also guide the machining tool 62 to take up a defined position with respect to the edge of the board 8. The speed of the board affects the rate of cutting of the machining tool 52 which is best kept within optimum limits. For this purpose the controller 58 may receive the outputs of position and speed encoders 53 and/or 54 and feed these results to a controller (not shown) of the speed of the board. The machining tool 52 may include one or more actual tools—sufficient to carry out the process XI described with reference to the previous figures and embodiments.
To machine the recess 6 on the underside of board 8 a machining station 60 is provided. Such a station 60 may include one or more machining tools 62 which may be a rotating tool such as a milling tool. The tool such as a milling tool may be mounted on a movable cylinder or other position controlling device 66 which allows the exact positioning of the machining tool 62 with respect to the bottom surface of the board 8, e.g. by means of hydraulic pressure. The machining tool 62 may be controlled and optionally powered from a controller 68 again to reduce latency. To position the machining tool 62 accurately with respect to the lower surface of the board 8, optional guides 63 and 64 can be used which may be in the form of encoders, e.g. rotational encoders to provide a position and speed value for the movement of the board 8. The guides 63 and 64 may not only determine the depth of penetration of the machining tool 62 but may also guide the machining tool 62 to take up a defined position with respect to the edge of the board 8. The speed of the board affects the rate of cutting of the machining tool 62 which is best kept within optimum limits. For this purpose the controller 68 may receive the outputs of position and speed encoders 63 and/or 64 and feed these results to a controller (not shown) of the speed of the board. The machining tool 62 may include one or more actual tools—sufficient to carry out the process X2 described with reference to the previous figures and embodiments.
In case an intermittent recess 6 is to be produced, e.g. by the process ZI as described above, the position controlling device 66 moves the machining tool 62 up and down to engage the bottom edge surface of the board at the times as synchronised with reference to the movement of board 8 as captured by the position and speed encoders 63 and/or 64. The movement of the machining tool in and out determines the position of the recesses 6 which has to be coordinated with the position of the tongues 5.
The distance of the recess 6 from the edge of the board 8 and the length of the tongue 5 need to be closely controlled.
To isolate the tongues in accordance with process YI as previously described, a machining station 70 is provided as shown in
Each tool makes a reciprocating motion towards and away from the board in a direction perpendicular to the movement of the board as the head 78 rotates while at the same time traversing a translation motion parallel to the motion of the board. As at least one tool has an axis of rotation tilted at an angle alpha to the vertical the machining of the board in the gaps between the tongues forms a sloping section of the abutment surface of joining boards which is the surface 21 at the angle alpha to the horizontal.
It is preferred if the full width of each tool 72-75 penetrates into the board. In that case the width S of the spaces between the tongues equals or almost equals the diameter DT of each tool (see left hand image in
The repetition distance R is given by (see
R=(2·π·r·Vpi)/(n·VC)
Where r=distance edge of board to center turret
Individual boards may also be machined using a head 80. This can be used for the shorter sides of oblong floor tiles for instance. Tool 80 may be moved in and out as described above while the board is held stationary.
Alternative method of machining can be used such as an Archimedes screw or a CNC machine. Cutting using an Archimedes screw takes advantage that the outer surface of the screw moves forward as the screw rotates. If cutting edges are provided on the outer surface then it can be arranged that the cutting surface acting on the board moves forwards at the same speed as the board as the surface rotates and carries out a cutting action.
In conventional CNC machining the board is held stationary and cutting tools are moved. The CNC machine can be combined with movements of an X-Y table. Dedicated moving tables can also be used as shown schematically in
To isolate the tongues in accordance with process YI as previously described, a machining station 170 can also be provided as shown in
Each tool makes a reciprocating motion towards and away from the board as the head 178 moves towards and away from the board perpendicular to the motion of the board while at the same time traversing a translation motion parallel to the motion of the board. As at least one tool has an axis of rotation tilted at an angle alpha to the vertical the machining of the board in the gaps between the tongues forms a sloping section of the abutment surface of joining boards which is the surface 21 at the angle alpha to the horizontal.
As previously it is preferred if the full width of each tool 174, 175 penetrates into the board. In that case the width S of the spaces between the tongues equals the diameter DT of each tool. A larger diameter of tool can be used but then the tool does not penetrate so far into the board and the side edges of the tongue are not straight but curved resulting in a tongue with a trapezoidal shape.
To isolate the tongues in accordance with process Y2 as previously described, a machining station 370 is provided as shown in
Each tool makes a reciprocating motion towards and away from the board in a direction perpendicular to the movement of the board as the table 378 moves back and forth while at the same time traversing a translation motion parallel to the motion of the board 8. At least one tool has a horizontal axis of rotation the machining of the board in the gaps between the tongues and forms a concave sloping section of the abutment surface of joining boards which is the surface 21.
Individual boards may also be machined using a head 380. This can be used for the shorter sides of oblong floor tiles for instance. Tool 380 may be moved in and out as described above while the board 8 is held stationary.
The shape of a tongue produced with the arrangement shown in
Embodiments of the present invention can be provided at a lower production cost while at the same time function and strength can be retained or even, in some cases, be improved by a combination of manufacturing technique, joint design, and choice of materials.
| Number | Date | Country | Kind |
|---|---|---|---|
| 14164155.5 | Apr 2014 | EP | regional |
This application is a continuation application of U.S. patent application Ser. No.: 16/020,350, filed Jun. 27, 2018, which is a continuation application of U.S. patent application Ser. No.: 15/303,140, filed Oct. 10, 2016, which is a U.S. national phase application of PCT International Application No. PCT/EP2015/057779 filed Apr. 9, 2015, which claims priority to European Patent Application No. EP 14164155.5 filed Apr. 10, 2014, the contents of each application being incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16020350 | Jun 2018 | US |
| Child | 16887694 | US | |
| Parent | 15303140 | Oct 2016 | US |
| Child | 16020350 | US |
