HK40027887A - Panel with a hook-like locking system - Google Patents

Description

The invention relates to a panel as defined in the general term of claim 1, such panels consist of a panel top and a panel bottom and at least four panel edges facing each other in pairs, with complementary support profiles arranged in pairs at the panel edges, which fit together in such a way that identical panels can be attached to each other, at least one of the support profile pairs having hook profiles, namely one panel edge with a pick-up hook and the opposite panel edge with a stop hook. Such panels are from DE 102011 086846 A. Other similar panels are known from DE 102011 121348 A, WO 2012/001503 A, and WO 03/01665 A4.

Such panels are used, for example, for the manufacture of flooring, in particular floating flooring panels, which usually have decorative surfaces.

Err1:Expecting ',' delimiter: line 1 column 118 (char 117)

The proposed hook profiles are also suitable for push-down locking, where all pairs of support profiles of a panel must be able to be connected by a vertical movement, i.e. for example by a downward movement of a panel, namely in a direction perpendicular to the top of the panel (vertical).

In practice, a panel at the end of a panel series cannot be locked because a wall is in the way and the panel is too long. To close the gap in the floor, it is common to cut a panel, for example, with a saw, to reduce it to the required length. With the severed remainder of the panel, a new panel series can usually be started.

WO 01/02670 proposes several pairs of hook profiles, which are intended to prevent horizontal pulling of the panels apart, i.e. in the plane of the panel and perpendicular to the locked edges of the panel.

Other panels with hook-profile pairs are known from WO 2010/ 143962 A1. The various examples of this state of the art are affected by the fact that the hook-profile pairs may crack when pulled apart in the panel plane and perpendicular to the locked edges of the panel. This occurs in particular if the panels are made of artificial wood material consisting of wood particles or fibres bound to a panel material by a binder.

Therefore, the applicant is looking for a panel with an improved hook profile pair.

The invention proposes a panel according to claim 1.

According to the invention, at least part of the top of the receiver edge is inclined downwards towards the outside of the receiver edge, with at least part of the base of the arresting device being complementarily adjusted to the slope of the top of the receiver edge, and with a gap between the outside of the receiver edge and the side of the receiver edge provided in the locked state.

The standard vector, within the meaning of the invention, is oriented perpendicularly outwards from the corresponding locking surface (not towards the panel material) and includes with the respective panel side it cuts an angle equal to the angular dimension around which the locking surfaces are inclined to the face on the panel surface (interchangeable angle).

The slope of the locking surfaces to the top of the panel may be in the range of 4° to 50°, preferably 5° to 30° and preferably 5° to 15°.

The panel is preferably made of a wood material such as HDF, MDF or OSB, which in the broad sense also includes wood plastic composites (WPC). Since the locking mechanism requires a certain elasticity, especially in the area of the first and corresponding second resistive agent, the above materials are suitable because of their elasticity. Alternatively, the panel material can also be a plastic, as in the case of LVT products (luxury vinyl tiles), because this plastic also brings a certain elasticity.

Err1:Expecting ',' delimiter: line 1 column 1283 (char 1282)

Thermoplastics in particular also have the advantage that the products made from them can be very easily recycled, and recycled materials from other sources can also be used, which is another way of reducing production costs.

Such support plates are very elastic or spring-like, which allows a comfortable impression when walking and can also reduce the noise occurring when walking compared to conventional materials, thus improving the sound insulation of the foot.

In addition, the above-mentioned support plates have the advantage of good water resistance, as they have a melting point of 1% or less.

The material of the support plate can be made of or contain wood-plastic composite (WPC) materials, which is particularly advantageous. For example, wood and a polymer, which can be in a ratio of 40/60 to 70/30, for example, 50/50 may be suitable. Polymer components such as polypropylene, polyethylene or a copolymer of the above materials can be used as polymer components. Both materials have the advantage of being able to be formed into a support plate at low temperatures, such as in the range ≥180°C to ≤200°C, in the prescribed process, so that a particularly efficient process, such as LPC polymer, can allow production speeds in the range of 6 mm/min, which can be used for the production of a particularly efficient product, for example, with a production capacity of 4,1 mm/min.

In addition, very stable panels can be produced which continue to have a high elasticity, which can be particularly advantageous for the effective and cost-effective design of connecting elements at the edge of the support plate and also for the sound insulation of the foot.

Furthermore, it may be particularly advantageous for the support panel to include or consist of a PVC-based material. Such materials can also be used in a particularly advantageous way for high-quality panels, which can be used easily in wet areas, for example. PVC-based materials for the support panel are also suitable for a particularly efficient manufacturing process, as line speeds of 8m/min at an example product thickness of 4.1 mm can be achieved, which can allow a particularly efficient manufacturing process.

For plastic-based panels as well as for WPC-based panels, mineral fillers may be advantageous. Particularly suitable are talc or calcium carbonate (chalk), aluminum oxide, silica gel, quartz flour, wood flour, plaster. For example, chalk may be provided in a range of ≥ 30% by weight to ≤ 70% by weight, whereby the fillers, especially the chalk, can improve the slipperiness of the support plate. They may also be coloured in a known way. In particular, it may be provided that the material of the support plates has a flame retardant.

In addition, the material of the supporting board may contain between ≥0 and ≤10% by weight of other additives, such as flux aids, thermostabilisers or UV stabilizers. The particle size of the particle is > 10 μm to ≤ 600 μm with a preferred particle size distribution of ≤ 400 μm or ≥ 50 μm. In particular, the wood-based material of the supporting board may contain particles with a particle size distribution of ≥ 10 μm to ≥ 400 μm. The particle size of the supporting board may be provided on a pre-set volume of ≥ 10 μm or a particle size of ≤ 800 μm. The material of the supporting board may be provided with a particle size distribution of ≥ 10 μm or ≤ 400 μm. The particle size of the supporting board may be specified as a particle size of ≥ 10 μm or ≤ 800 μm. The particle size of the supporting board may be specified as a particle size of ≤ 10 μm or ≤ 800 μm. The particle size of the supporting board may be specified as a particle size of ≤ 10 μm or ≤ 800 μm. The particle size of the supporting board may be provided on a pre-set volume of ≤ 10 μm or ≤ 800 μm. The material of the supporting board may be provided on a particle size of ≥ 10 μm or ≤ 800 μm.

In addition, the material of the supporting board may contain between ≥0 and ≤10% by weight of additional additives, such as fluid aids, thermostabilizers or UV stabilizers. The particle size of the wood pellet is > 0 μm to ≤ 600 μm with a preferred particle size distribution D50 of ≥ 400 μm. In particular, the supporting board may contain particles with a particle size distribution D10 to ≥ 400 μm. The core size of the pellet may be ≥ 800 μm. The size of the pellet may be specified in a pre-set particle size range of ≤ 10 μm or ≤ 600 μm, and the preferred material may be specified as a particle size of ≥ 10 μm.

In another design, the material of the supporting board consists of a mixture of a PP homopolymer with wood. The proportion of the PP homopolymer and the proportion of wood may be between ≥ 45% by weight and ≤ 55% by weight. Furthermore, the material of the supporting board may contain between ≥ 0% by weight and ≤ 10% by weight of additional additives, such as adjuvants, thermostabilizers or UV stabilizers. The particle size of the wood is between > 0 μm and ≤ 600 μm with a preferred particle size distribution D50 of ≥ 400 μm. In particular, the supporting board may refer to wood with a particle size distribution D10 ≥ 400 μm. The particle size distribution is based on the particle size and the particle volume.In particular, the material of the support plate is preferably supplied as a granulated or pelletized pre-extruded mixture of a PP homopolymer with wood particles of the specified particle size distribution. The granulate and/or pellets may preferably have a grain size in the range of ≥400 μm to ≤10 mm, preferably ≥600 μm to ≤10 mm, in particular ≥800 μm to ≤10 mm. In a further development of the invention, the material of the support plate consists of a mixture of a PVC polymer with chalk. The proportion of the PVC polymer and the proportion of chalk may be between ≥45% and ≤55%. Furthermore, the material of the support plate weighs between ≥0%.-% and ≤ 10% by weight of other additives, such as fluid aids, thermostabilizers or UV stabilizers. The particle size of the chalk is > 0 μm to ≤ 600 μm with a preferred particle size distribution D50 of ≥ 400 μm. In particular, the material of the support plate may contain chalk with a particle size distribution D10 of ≥ 400 μm. The particle size distribution is based on the volumetric diameter and the volumes of the particles. The material of the support plate is preferred as granulated or pre-extruded granulated mixture or a PVC polymer with the specified size distribution. The particle size distribution can be provided in a range of ≤ 10 μm and the granules can be preferred in a range of ≤ 400 μm.preferably ≥ 600 μm to ≤ 10 mm, in particular ≥ 800 μm to ≤ 10 mm.

In another configuration, the material of the support plate consists of a mixture of PVC polymer with wood. The proportion of PVC polymer and wood may be between ≥ 45% and ≤ 55% by weight. In addition, the material of the support plate may contain between ≥ 0% and ≤ 10% by weight of additional additives, such as fluid aids, thermostabilizers or UV stabilizers. The particle size of the wood is between > 0 μm and ≤ 600 μm with a preferred particle size distribution of ≤ 400 μm. In particular, the material of the support plate may refer to a wood plate with a particle size distribution of ≥ 400 μm. The cortex size of the material may be ≥ 400 μm. The size of the particles may be specified in a pre-defined range of ≤ 600 μm or a particle size of ≥ 600 μm. The size of the particles may be specified in a pre-defined range of ≤ 10 μm or a particle size of ≥ 400 μm. The size of the cortex may be specified in a specific distribution of ≥ 800 μm. The size of the particles may be specified in a partial distribution of ≤ 10 μm or in a partial distribution of ≤ 600 μm.

The standard methods, such as laser diffractometry, can be used to determine particle size distribution, which can be used to determine particle sizes in the range of a few nanometres to several millimetres, and also to determine D50 and D10 values, which are 50% and 10% of the measured particles, respectively, smaller than the specified value.

According to another design, the material of the support plate has a plastic matrix material and a solid material, whereby the solid material is at least 50% by weight, in particular at least 80% by weight, preferably at least 95% by weight, in relation to the solid material, formed by talc, the matrix material being present in a quantity, in relation to the material of the support, of ≥ 30% by weight to ≤ 70% by weight, in particular ≥ 40% by weight to ≤ 60% by weight, and the solid material, in relation to the material of the support plate, in a quantity, in relation to the material of the support plate, of ≥ 30% by weight to ≤ 70%.- in particular ≥ 40 to ≤ 60%, e.g. less than or equal to 50% by weight. It is further provided that the material of the support plate and the solid material are present together in a quantity of ≥ 95% by weight, in particular ≥ 99% by weight, in relation to the material of the support plate. In such a design of the invention, the solid material may be formed by talc at least 50% by weight, in particular at least 80% by weight, e.g. 100% by weight, in relation to the solid material. Talc is understood in a self-evident way to be a magnesium silicate hydrate which may have, for example, the chemical formula Mg3[4O10 (OH) Si].In principle, the solid material may consist of a powder-like solid, which may be advantageous if the specific surface density of the talcum particles according to BET, ISO 4652 is in the range of ≥ 4 m2/g to ≤ 8 m2/g, i.e. in the range of ≥ 5 m2/g to ≤ 7 m2/g.

Furthermore, it may be advantageous if the talc is present at a concentration density of ≥ 0,15 g/cm3 to ≤ 0,45 g/cm3 according to DIN 53468, for example, in a range of ≥ 0,25 g/cm3 to ≤ 0,35 g/cm3.

The matrix material in such a design is intended in particular to be used for the absorption or embedding of the solid material in the finished support. The matrix material has a plastic or a mixture of plastics. In particular, with regard to the manufacturing process, as described in detail below, it may be advantageous for the matrix material to have a thermoplastic plastic. This will allow the material of the support plate or a component of the support plate material to have a melting point or a softening point to form the material of the support plate by heat treatment in a further process step, as described in detail below with regard to the matrix material. The matrix material in particular may consist of at least 99% plastic or 90% plastic by weight and, where appropriate, at least 95% of this material by weight.

It may also be provided that the matrix material is present in a quantity, in relation to the support plate material, of ≥ 30% by weight to ≤ 70% by weight, in particular ≥ 40% by weight to ≤ 60% by weight, and that the solid material, in relation to the support plate material, is present in a quantity, in relation to the support plate material, of ≥ 30% by weight to ≤ 70% by weight, in particular ≥ 40% by weight to ≤ 60% by weight.

Polypropylene is particularly suitable as a matrix material, on the one hand because it is inexpensive and, on the other hand, because it has good properties as a thermoplastic plastic matrix material for embedding solid material. In particular, a mixture of a homopolymer and a copolymer can provide particularly advantageous properties for the matrix material. Such materials also have the advantage that they can be formed into a support at low temperatures, such as in the range ≥ 180°C to ≤ 200°C, in the prescribed process, so that particularly efficient process management can be achieved, with line speeds of about 6m/min.

Furthermore, it may be advantageous if the homopolymer has a tensile strength according to ISO 527-2 in a range from ≥ 30 MPa to ≤ 45 MPa, for example in a range from ≥ 35 MPa to ≤ 40 MPa, to achieve good stability.

Furthermore, it may be particularly advantageous for good stability if the homopolymer has an ISO 178 bending modulus in a range of ≥ 1000 MPa to ≤ 2200 MPa, for example in a range of ≥ 1300 MPa to ≤ 1900 MPa, for example in a range of ≥ 1500 MPa to ≤ 1700 MPa.

The tensile strength of the homopolymer according to ISO 527-2 may also be advantageous if it is in a range of ≥ 5% to ≤ 13%, e.g. in a range of ≥ 8% MPa to ≤ 10%.

For particularly advantageous manufacturability, the Vicat softening temperature according to ISO 306/A for an injection moulded component may be provided in a range from ≥ 130°C MPa to ≤ 170°C, for example in a range from ≥ 145°C to ≤ 158°C.

It may also be advantageous for the solid material to have at least one other solid in addition to talc. This design may in particular allow the weight of the support plate material or of a panel formed with the support plate material to be significantly reduced compared to a material of the support plate or panel in which the solid material is composed of talc. The solid added to the solid material may therefore have a particularly low density compared to talc. For example, the added material may have a raw density in the range ≤ 2000/m3, in particular ≤ 1500 kg/m3, in particular ≤ 1000 kg/m3, in addition to ≤ 500 kg/m3.

For example, the other solid may be selected from the group consisting of wood, e.g. in the form of wood meal, blown wood, volcanic ash, bims, porous concrete, especially inorganic foams, cellulose. For example, for porous concrete, this may be the solid used by Xella under the brand name YTONG, which is mainly composed of quartz sand, lime and cement, or the porous concrete may contain the above components. For the added solid, this may be, for example, particles with the same particle size or particle size distribution as the particles described for talc or other particles of a larger size. For example, particles of a particular size may be present in a range of < 5%, < 20%, for example, in a solid, in a range of < 50%.

Alternatively, for example, wood, in particular wood meal, may be provided with a particle size between >0μm and ≤600μm with a preferred particle size distribution D50 of ≥400μm.

In particular, the inclusion of micro-beads can ensure stability of the resulting panel, which is not significant compared to a material without micro-beads. Thus, stability is fully sufficient for most applications. In particular, micro-beads can be understood as PE beads, which have a low core size and a maximum diameter of about 50 μm or less. These additives can be used in any material, for example plastic or plastic, where the core material is ≥ 50 μm. For example, PVC, which is used in the manufacture of micro-beads, can be used in any material, for example, where the core material is ≥ 50 μm.

The hardness of the material of the support plate can be in the range of 30-90 N/mm2 (measured by Brinell).

The part of the base of the restraint and the part of the top of the receiving edge may be parallel to each other when locked.

The capture nut of the single hook profile shall be such that the stop edge of the complementary hook profile fits into the capture nut and the stop nut of the complementary hook profile shall be such that the capture nut of the single hook profile fits into the stop nut.

A further training shall be provided for the first resting medium of the lower suspension to have a resting forward and the second resting medium of the lower suspension to have a corresponding resting depth.

Alternatively, the first restraint of the lower groove may have a groove and the second restraint of the lower groove a groove leading to it.It may also be useful to provide an upper groove with a first restraint on one side of the groove and a corresponding second restraint on a recessed flank of the intake.

The first restraint of the upper grating shall, if appropriate, have a restraint leading edge and the second restraint of the upper grating shall have a corresponding restraint depth.

Alternatively, the first resting agent of the upper suspension may have a resting depth and the second resting agent of the upper suspension may have a corresponding resting forward.

Another benefit is that there is at least a free space between the bottom of the stop edge and the bottom of the recording.

The free space may contain dirt or other loose particles. For example, in the case of panels made of wood, particles may break off from the edge of the panel and not be allowed to settle between the joints of the hook profiles, otherwise they could impede the correct locking of the hook profiles.

In addition, a gap is provided between the outside of the receiving edge and the utility side of the arresting edge when locked.

The lower edge of the stop edge, when locked, is preferably at least partially touching the input of the recording equipment.

The reception area has a convenient passage to the inside of the reception area, where the passage is provided with a curve. The curve provides an edge protection. It can also be used to guide the stop edge if it comes into contact with the curve.

The following illustrations illustrate the concepts underlying the invention and describe them in detail using several examples of implementation: Figure 3a, a first example of a non-inventive panel, where the panel is cut to show the hook profiles facing it in the unlocked state,Figure 4a, the hook profiles of the panel as shown in Figure 3 in the locked state,Figure 4ae, an enlarged detail according to Section IVa in Figure 4a, legs for alternate Figure 4a, an example of a non-inventive panel for hook profiles of the panel as shown in Figure 3 in the unlocked state,Figure 5a, a panel with a hook profile as shown in Figure 5a, an example of an alternative panel with a hook profile as shown in Figure 8a, an example of a panel with a hook profile as shown in Figure 8a, an example of an alternative panel with a hook profile as shown in Figure 8a, an example of a panel with a hook profile as shown in Figure 8a, an example of an alternative panel with a hook profile as shown in Figure 8a, an example of an alternative panel with a hook profile as shown in Figure 8a, an example of a panel with a hook profile as shown in Figure 8a, an example of an alternative panel with a hook profile as shown in Figure 8a, an example of a panel with a hook profile as shown in Figure 8a, an example of a panel with a hook profile as shown in Figure 8a, an example of a panel with a hook profile as shown in Figure 8a, an alternative panel with a hook profile as shown in Figure 8a, an example of a hook profile as shown in Figure 8a, an alternative panel with a hook profile as shown in Figure 8a, an alternative panel with a hook as shown in Figure 8a, an example of a hook profile as shown in Figure 8a, an alternative panel with a hook profile as shown in Figure 8a, an alternative panel with a hook.

Fig. 1 shows a prospective fold-down method for locking panels according to the state of the art. A new panel 1 is angled at an angle with a spring profile edge 2 forward to a nut profile edge 3 of a lying panel 4 of a previous panel series. Then the new panel 1 is tilted down into the plane of the mounted panels, with an identical panel 5 already in the same panel series.

Figure 1 shows the construction of a floor area, in which a new panel is always continuously laid to the left.

Figure 2 shows a second example of a fold-down method of locking panels, which is known to the technical community, and differs from the method in Figure 1 only in that a new panel must be continuously placed to the right, i.e. the edges of the panel with the pick-up hooks or the stop hooks have been replaced as compared with the example in Figure 1.

The use of the fold-down method for locking the nut and spring profiles is well known in the technical field, for example from WO 97/ 47834 A1 or WO 00/63510.

Fig. 3 is a first example of a non-inventory panel 1 with a panel top 1a and a panel bottom 1b, whereby only one pair of panel hooks is shown in simplified form. The pair of panel hooks shown here have complementary hook profiles, namely a stop hook 6 (top) and a pick hook 7 (bottom).

The recording hook 6 has a recording edge 8 facing the top of the panel 1a and an open recording edge 9 facing the top of the panel.

An inner side of the receiver 8 is facing the receiver 9 and this inner side serves as the lower locking surface 12. Accordingly, the stop hook 7 forms an upper locking surface 13 on one of the receiver 11 facing the inner side of its receiver 10 which interacts with the lower locking surface 12 of the receiver 8.

The lower locking surface 12 and the upper locking surface 13 are inclined at an angle α to the L-lot on the top of the panel, so that the corresponding locking surfaces 12 and 13 are parallel to each other in the locked state and can touch.

In addition, the slope of the lower locking surface 12 is chosen so that the normal vector N12, which is perpendicular to the outside of the lower locking surface 12, intersects the top of panel 1a. Conversely, the normal vector N13 on the top locking surface 13 is perpendicular to the outside, so that this normal vector N13 intersects the opposite panel bottom 1b. Generally, the normal vector 1a and the normal vector N12 include an angle as large as the above mentioned angle α (equal to each other). The same is true of the bottom of the panel, which includes a large angle (equal to the vector N13).

With a sub-side 10a of the stopper 10 the stopper 7 is firmly mounted on a base 9a of the recording 9 of the recording 6 If, within the range of the stopper 10 a load is applied to the top of the panel 1a, the stopper 10 can bear this load because its sub-side 10a is supported on base 9a of the recording 9.

A further function of the hook profiles is to prevent a height shift of the locked panel edges. To this end, a lower groove 14 is provided. This includes a first restraint in the form of a protruding spring at the receiving hook 7. The spring 15 is located on an outer side 8a of the receiving rim 8.

At the 6th hook, a section 8b of the top of the 8th hook has a downward slope, i.e. falling towards the outside of the 8th hook, and accordingly, at the 7th hook, a section 11b of the 11th hook is complementarily adjusted to the slope of section 8b of the top of the 8th hook.

In addition, the reception hook 6 provides a transition from the top 8b of the reception rim 8 to the lower locking surface 12. The transition is formed as curvature 17. Curvature 17 is a radius in this example. Similarly, the arresting hook 7 provides a transition with a curvature 18 between the part 11b of the base of the arresting nut 11 and the upper locking surface 13. The curvature 17 on the reception rim provides an edge protection as well as a guide surface. The edge protection is stronger than the protective effect of a phase having the same width and height as the upper curvature 17. Curvature 18 has a throat. It serves as an example of a radius and stability of the transition area of the retention loop in the case of the present case 13.

The hook profiles of Fig. 3 are shown in the locked condition as shown in Fig. 4. The resting protrusion 15 of the receiving hook 6 which is located on the outside 8a of the receiving edge 8 makes a definite entrance into the resting depression 16 which is located on the reversed nut 11a of the arresting edge 11. The lower depression 14 counters a height shift of the two panel tops 1a, i.e. a movement of the panel away from the vertical to the panel surface.

Between the slanted part 11b of the base of the stop nut and the slanted part 8b of the top of the receiver edge 8 there is a gap 19. This helps to avoid a height shift at the F-fuse of the top of panel 1a. Moreover, the gap 19 allows a certain flexibility of the stop hook 7. It has a point of its lowest thickness which is where the stop nut 11 is lowest. The flexibility thus gained can be used because the gap 19 creates space in which deformation can take place.

Figure 4a shows a detail which enlarges a section marked with IVa in Figure 4a. In Figure 4a the resting protrusion 15 is provided at the receiving hook 6, namely at the outside 8a of the receiving edge 8.

In the alternative shown in Figure 4b, the positions of the retractor and the retractor are reversed, with a retractor 15a at the receiving hook 6 and on the outside of the receiving edge 8a.

Figure 5 provides another non-inventive example of a panel with special hook profiles, based on the example in Figures 3 and 4. It differs from this by an additional upper groove 20. The upper groove 20 has a first restraint in the form of a restraint spring 21 on the stop hook 7 which is located on the outside of the stop hook 10b. It works together with a corresponding second restraint on the reception hook 6 provided for on the re-inserted utility flank 9b of Figure 9. The second restraint forms a restraint groove 22 which is best seen in the exit in Figure 5a. Figure 5a shows the first restraint spring 21 as shown in Figure 5a. The second restraint is located on the exit in Figure 9a.

The non-conforming embodiment of Fig. 6 shows hook profiles which show a change from Fig. 3 and 4, whereas in the locked condition of the hook profiles shown, a free space 23 is formed which extends between the bottom 9a of the hook 9 of hook 6 and a bottom 10a of the hook 10 of hook 7. The free space 23 extends to the outside 10b of hook 10 and then to the back side 9b of hook 9. The free space 23 can accommodate particles of dirt or other loose particles. In the case of wood panels, for example, the hook 9a can be removed from the hook 9a. In the case of hook 9a, this free space is intended to be used to separate the hook 9a from the hook 9a. This is not possible because the hook 9a is located in the middle of the hook 10 and the hook 10a.

The non-conforming embodiment of Fig. 7 shows hook profiles which also show a change from Figures 3 and 4 in such a way that, again, in the locked state of the hook profiles, a free space 24 is formed, which extends between the bottom 9a of the drawings out 9 of the hook 6 and a sub-side 10a of the ground 10 of the stop hook 7. The free space 24 extends to the lower locking surface 12 of the hook 6 and to the upper locking surface 13 of the stop hook 7. This creates the free space 24 and the wood products 10a of the stop hook 10 are placed behind the hook with a flat 24a position, which is approximately 10a from the bottom of the hook 10 of the stop hook. The free space 9 may be located on a loose surface between the hook 10 and the other useful materials in the hook 10 or 10a of the stop hook. The free space 9 may be used to create a loose and similar position in the wood products 9 and 10a of the stop hook.

The embodiment of the invention in Fig. 8 also shows hook profiles starting from Figures 3 and 4. Compared to these figures only the lower hook 14 has been modified. According to Fig. 8, the resting protrusion 15 of the intake hook 6 is more prominent from the outside 8a of the intake rim 8 than in Fig. 4. The depth of the resting depression 16 is unchanged from Fig. 4. This creates a gap 25 between the outside 8a and the repositioned flank 11a of the arresting nut 11 of the arresting hook 7.

In Figure 8a, the lower groove 14 is enlarged as a cut-off. An alternative to Figure 8a is the cut-off shown in Figure 8b. The position of the groove and groove is then switched. A groove 15a is now placed on the receiving hook 6 and on the outside of the receiving edge 8a. A groove 16a is provided for this on the stopping hook 7 at its repositioned utility flank 11a of the stopping nut 11.

Another embodiment of the invention for panel hooks is shown in Fig. 9, which is also based on Figures 3 and 4 and also incorporates all the modifications proposed in the examples in Fig. 5, Fig. 6, Fig. 7 and Fig. 8.

List of reference marks

1 new panel1a panel top1b panel bottom2 spring profile edge3 utility profile edge4 previous row panel5 panel of the same panel series6 recording hook7 arresting hook8 recording edge8a outer side8b part top9 recording edge9a bottom9b reversed nut flank10 arresting edge10a bottom10b outer side11 arresting edge11reversed flank11b reversed nut flank12 lower locking surface13 upper opening opening surface14 lower opening 15resting edge15resting edge15resting edge16resting edge16resting edge16resting edge17resting edge18resting edge18resting edge20resting edge21resting edge22resting edge22resting edge22resting edge22resting edge22resting edge21resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22resting edge22

Claims (12)

1. Panels (1, 4, 5) comprising a panel top side (1a) and a panel underside (1b) and comprising at least four panel margins which are situated opposite one another in pairwise fashion, having complementary holding profiles which are provided in pairwise fashion on the panel margins and which fit together such that identical panels are fastenable to one another, wherein at least one of the holding profile pairs is equipped with hook profiles, specifically with a receiving hook (6) on one panel margin and with an arresting hook (7) on the opposite panel margin, wherein the receiving hook (6) has a receiving edge (8) directed towards the panel top side (1a) and a receiving groove (9) open towards the panel top side, and the arresting hook (7) is provided with an arresting edge (10) which is directed towards the panel underside (1b) and with an arresting groove (11) which is open towards the panel underside (1b), wherein the receiving edge (8) has an inner side which faces towards the receiving groove (9), and said inner side serves as lower locking surface (12), and in a manner adapted to this, the arresting edge (10) has an inner side which faces towards the arresting groove (11), and said inner side serves as corresponding upper locking surface (13), with the condition that both the lower locking surface (12) and the upper locking surface (13) are each inclined relative to the perpendicular (L) to the panel top side (1a) such that, in the locked state, said lower locking surface and upper locking surface are oriented parallel to one another and can make contact, wherein the inclination of the locking surfaces (12, 13) is selected such that the normal vector (N₁₂) with respect to the lower locking surface (12) intersects the panel top side (1a) and the normal vector (N₁₃) with respect to the upper locking surface (13) intersects the panel underside (1b), wherein a lower detent engagement point (14) is provided which comprises a first detent means (15, 15a) which is arranged on an outer side (8a) of the receiving edge (8), and the lower detent engagement point (14) comprises a second detent means (16, 16a) which corresponds to said first detent means and which is arranged on a recessed groove flank (11a) of the arresting groove (11), and wherein at least one free space (23, 24) is provided between the underside (10a) of the arresting edge (10) and the groove base (9a) of the receiving groove (9), characterized in that at least a partial section (8b) of the top side of the receiving edge (8) runs downwards in an inclined manner in the direction of the outer side (8a) of the receiving edge (8), wherein at least a partial section (11b) of the groove base of the arresting groove (11) is adapted in complementary fashion to the inclination of the partial section (8b) of the top side of the receiving edge (8), and wherein, in the locked state, a gap (25) is provided between the outer side (8a) of the receiving edge (8) and the groove flank (11a) of the arresting groove (11) .
2. Panel according to Claim 1, characterized in that the first detent means of the lower detent engagement point (14) has a detent projection (15), and in that the second detent means of the lower detent engagement point (14) has a detent depression (16) adapted to said detent projection.
3. Panel according to Claim 1, characterized in that the first detent means of the lower detent engagement point (14) has a detent depression (15a), and in that the second detent means of the lower detent engagement point (14) has a detent projection (16a) adapted to said detent depression.
4. Panel according to one of Claims 1 to 3, characterized in that an upper detent engagement point (20) is provided which has a first detent means (21, 21a) on an outer side (10b) of the arresting edge (10), and a second detent means (22, 22a) corresponding to said first detent means is provided on a recessed groove flank (9b) of the receiving groove (9).
5. Panel according to Claim 4, characterized in that the first detent means of the upper detent engagement point (20) has a detent projection (21), and in that the second detent means of the upper detent engagement point (20) has a detent depression (21a) adapted to said detent projection.
6. Panel according to Claim 4, characterized in that the first detent means of the upper detent engagement point (20) has a detent depression (21a), and in that the second detent means of the upper detent engagement point (20) has a detent projection (22a) adapted to said detent depression.
7. Panel according to one of Claims 1 to 6, characterized in that the underside (10a) of the arresting edge (10) makes contact at least in regions with the groove base (9a) of the receiving groove (9) in the locked state.
8. Panel according to one of Claims 1 to 7, characterized in that the receiving edge has a transition to the inner side of the receiving groove (9), and in that the transition is provided with a curvature (17).
9. Panel according to one of Claims 1 to 8, characterized in that there is a gap (19) between the inclined partial section (11b) of the groove base of the arresting groove (11) and the inclined partial section (8b) of the top side of the receiving edge (8) .
10. Panel according to one of Claims 1 to 9, characterized in that the arresting hook (7) has a position of lowest thickness at the point at which the arresting groove 11 is at its deepest.
11. Panel according to one of Claims 1 to 10, characterized in that the free space (23) is in the form of a gap and widens in the direction of the groove base (9a).
12. Panel according to one of Claims 1 to 11, characterized in that the first detent means (15) is spaced apart from the inclined partial section (8b) of the top side of the receiving edge (8).