RU219218U1 - HIDDEN FASTENING FOR TERRACE BOARD - Google Patents

Abstract

The utility model relates to the field of construction and serves as a fastening element between the load-bearing and finishing elements of structures made of wood or wood-polymer composite (WPC), examples of which are decking on terraces and indoors, walls and ceilings finished with WPC boards. The technical result is a more reliable preservation of the plane of the double-edged central tab in one position to the base, which allows the use of fasteners on boards with knots and reduces the risk of curvature of the plane of the central tab with time when the decking board dries. Also, the claimed fasteners significantly speeds up the process of installing a terrace board in time in comparison with the prototype. The specified technical result is achieved due to the fact that a hidden fastener for a terrace board is claimed, consisting of a base made in the form of a plate with holes for fastening and support legs bent from the base by 90 °, and the support legs located along the edges of the base are bent to the side , opposite the central support tab, which is located in height above the extreme support tabs and is formed by a double-sided spike, in the middle part of which a protrusion is made, characterized in that from one spike tip to the other spike tip, a stiffening rib is made on the plate of the central support tab.

Description

The utility model relates to the field of construction and serves as a fastening element between the load-bearing and finishing elements of structures made of wood or wood-polymer composite (WPC), examples of which are decking on terraces and indoors, walls and ceilings finished with WPC boards.

Known klyaymer HILST FIX prof 3D (https://hilst.ru/product/krepezhi-dlya-terrasnykh-dosok/klyaymer-hilst-fix-prof-3d-metall/). This fastener provides a reliable connection of the load-bearing and finishing elements of the WPC structure, provides a beautiful appearance without visible fasteners and, according to the manufacturer on the website, provides a fixed gap of up to 3 mm due to the base bent at a certain angle and creates an additional compensation gap of up to 2 mm for transverse expansion of the boards due to its straightening and reverse springing.

However, the steel used in the manufacture of this fastener - AISI 201, is not spring-loaded and has a low elastic and tensile strength, and when loads exceeding the elastic limit value are applied to the base, the base will remain in an unbent state.

In practice, it is enough to hit the mallet on the board during installation to change the angle of the bend of the base of the kleimer and, accordingly, the gap between the boards will not be the declared smaller value. WPC boards are moisture resistant, but if they are in water for a day, they can increase their size up to 0.3%. In the process of swelling and drying of the boards, the bent base will also straighten out, so the gap is not fixed.

As a solution to this problem, the use of spring steel in stamping is undesirable due to the high cost of its processing. In addition, for the installation of WPC boards, it is sometimes necessary to make a gap of up to 6 mm. When this requirement is met by bending the base at a larger angle, it turns out that the bent fastener foot is not long enough to clamp the board with it.

Also, the disadvantage of this analogue is the insufficient area of contact of the legs of the fastener with the board.

Known hidden fasteners for structures made of wood-polymer composite (RU186613U, published: 01/24/2019), providing high reliability of the connection of structural elements from WPC, having the ability to obtain a fixed accurate gap between the boards up to 6 mm.

The prototype is a base with support and clamping S-shaped legs bent from it, characterized in that pimples are extruded on a rectangular base, and they are extruded in different directions from each other, so that the thickness of the base at the extreme protruding points varies from 2 to 6 mm, from the bottom of the base there are 3 support legs, which are rectangular elements bent from it by 90 °; the supporting legs located at the edges of the base are bent back and holes with a countersink are made in them, and the central element with a hole made in it with a peck is bent forward; on top of the base there are 3 presser feet of an S-shaped profile, which are rectangular elements bent from it at an angle of less than 90 °, the ends of which are bent upwards from them at an angle of at least 135 °; the presser feet at the edges of the base are folded forward, and the center presser foot is folded back.

The technical problem of the analogue is that the resulting gap is fixed, and there is no possibility of compensation from the expansion of the material after installation.

In addition, the presence of pits in the base provides a fixed gap between the boards within 2-6 mm, and if the gap between the boards is not needed, for example, when the WPC boards are installed indoors, pits in the base are not performed. Thus, two types of fasteners are needed - with pecking, if a gap is needed, and without it, if not needed, since pecking fasteners do not allow for the elimination of a gap between the boards.

Known hidden fasteners for structures made of wood-polymer composite (patent RU 216524 U, published: 02/14/2023), including a base consisting of a central and extreme parts, with three support legs bent from the base in the form of rectangular elements, in which holes are made with countersink, and three presser feet of an S-shaped profile, bent from the base at an angle of less than 90 °, made in the form of rectangular elements, the ends of which are bent upwards from them at an angle of at least 135 °, and from the bottom of the extreme parts of the base, two support legs are bent back , and from the top of the extreme parts of the base, two presser feet are bent forward, from the bottom of the central part of the base, one support foot is bent forward, and from the top of the central part of the base, one presser foot is bent back, characterized in that the central part of the base is connected to the extreme parts symmetrically located relative to its middles are curved parts in such a way that the plane of the central part of the base is parallel shifted relative to the planes of the extreme parts of the base.

This analog solves the problem of the previous technical solution according to the patent RU 186613 U and provides the possibility of compensating for linear expansions of the terrace decking after installation, a simpler universal design of the device that does not require two types of fasteners (with and without pecking).

The technical problem of all the analogues described above is the possibility of their use on wide logs, in which fasteners are fixed to the log with a self-tapping screw from top to bottom.

Meanwhile, there are situations when the width of the lag is insufficient (for example, the support boards are end-on and thin). In this case, the fixing of the decking board can only be done by screwing the self-tapping screw into the body of the log itself, and not its end.

Sharkstooth type fasteners are used for these purposes (see below).

This Sharkstooth fastener is selected as the closest match (see https://sharkstooth.co.nz/wp-content/uploads/2018/11/Installation-Guide-EMAIL.pdf, published: 02/14/2019). The Sharkstooth fastener is a base made in the form of a plate with holes for fastening and support legs bent from the base by 90 °, and the support legs located at the edges of the base are bent in the direction opposite to the central support tab, which is located in height above the extreme support legs and is formed by a double-sided spike, in the middle part of which there is a protrusion that serves to hit it with a mallet or hammer.

The technical problem of the prototype is the weak holding strength of the double-edged central support tab in one position at an angle of 90° to the base. At the moment the stud enters the body of the decking board, the plane of the thorn of the central leg can be bent under the action of entering the knot. It can also warp over time as the decking dries, resulting in a "floating floor" effect.

For this reason, Sharkstooth fastener instructions clearly state that dowels should not be fastened into knots of wood. However, this fastener does not protect against curvature when the board dries.

In Russia, such boards are often used as decking boards that do not have the highest quality category, that is, they have many knots. With the help of Sharkstooth mounts, it will be almost impossible to install such boards on logs.

The task of the utility model is to eliminate the shortcomings of the prototype and to realize the possibility of using knotted boards for decking boards.

The technical result is a more reliable preservation of the plane of the double-edged central tab in one position to the base, which allows the use of fasteners on boards with knots and reduces the risk of curvature of the plane of the central tab with time when the decking board dries. Also, the claimed fixture significantly speeds up the process of installing a decking board in time in comparison with the prototype.

This technical result is achieved due to the fact that a hidden fastener for a terrace board is claimed, consisting of a base made in the form of a plate with holes for fastening, and support legs bent from the base by 90 °, moreover, the support legs located along the edges of the base are bent into the side opposite the central support tab, which is located in height above the extreme support tabs and is formed by a double-sided stud, in the middle part of which a protrusion is made, characterized in that from one stud tip to the other stud tip, a stiffening rib is made on the plate of the central support tab.

Preferably, the stiffening rib is also made with a ledge at the bend of the central support tab.

Preferably, each spike of the central tab is formed by the tip of an acute angle ≤ 48°.

Preferably, the mounting holes in the base are made in the amount of three pieces and are oriented vertically, with the central hole being made of a smaller diameter than the outer ones.

Brief description of the drawings

Figure 1 shows the device of the utility model (view in volume from different angles).

Figure 2 shows the device of the utility model (front view).

Figure 3 shows the device of the utility model (side view).

Figure 4 shows the device of the utility model (top view).

Figure 5-Figure 14 shows the principle of using fasteners according to the utility model for fastening a decking board.

Figure 15 shows an example of a fastener with two fastening holes and without a ledge at the bend of the central support tab.

In the drawings: 1 - base, 2 - extreme support legs, 3 - central support tab, 4 - spike, 5 - stiffener, 6 - support leg of the central support tab, 7 - ledge, 8 - main mounting holes, 9 - mounting hole smaller diameter, 10 - protrusion.

Implementation of the utility model

Hidden fasteners for terrace boards according to the utility model (see Fig.1 - Fig.4) is a device consisting of a base 1, made in the form of a plate with holes for fastening, and support legs bent from the base by 90°. Support tabs 2, located along the edges of the base 1, are bent in the direction opposite to the central support tab 3, which is located in height above the extreme support tabs 2 and is formed by a double-sided spike 4. A protrusion 10 is made in the middle part of the double-sided spike 4.

What is new is that from one tip of the spike 4 to the other tip of the spike 4 on the plate of the central support foot 3 there is a stiffening rib 5.

Even better, if the stiffener 7 is also made with a ledge at the bend of the central support foot 3.

The presence of these stiffening ribs 5 and 7 provides strength strengthening of both the central support foot 3 itself and the place of its attachment to its support leg 6, which is part of the base 1.

As a result, the spiked plane of the central support leg 3 is practically not subject to bending, and is also less subject to bending relative to the support leg 6.

The support leg 6 can be made in the form of a protruding part of the base 1, and provides a higher location of the central support tab 3 relative to the extreme support tabs 2.

The height of the support leg 6 is set by the manufacturer depending on the thickness of the terrace board.

Each spike 4 of the central tab can be formed by the top of an acute angle α. Empirically, it was found that the optimal angle is α ≤ 48°. Such an acute angle, together with the stiffening rib 5, enters the end of the board more easily and at the same time provides such a size of the platform of the plate of the central support foot 3, which reduces the likelihood of its bending when entering places with knots. When the value of the angle α > 48°, the surface area of the central support foot 3 increases, which increases the risk of its curvature.

Holes for fastening in the base can be made from two (see the example in Fig.15) or more (see Fig.1 - Fig.4), and the holes are oriented vertically.

For example, if the number of holes is three, then the central hole 9 is made of a smaller diameter than the outermost holes 8.

The central hole of smaller diameter 9 can be used to temporarily fix the fastener with a nail. And holes 8 are used for fixing with a screw.

The protrusion 10 serves to abut a metal tube against it, with the help of which the fasteners are hammered with a spike 4 into the end of the board as shown in Fig.6, Fig.13.

The stiffener 5 of the central support tab 3 can be formed by punching the plate of the central support tab 3 with a press or immediately during the production of the fastener itself by stamping.

Another stiffening rib 7, which is a ledge at the bend of the central support foot 3 relative to the support leg 6, can also be made by punching a press or stamping. The presence of stiffening rib 7 strengthens the place of bending of the central support tab 3 relative to the support leg 6, which reduces the risk of changing the angle of 90° of the central support tab 3.

The stiffening rib 5, passing in the longitudinal direction of the plate of the central support foot 3 from one spike 4 to the other, on the one hand reduces the weak zone of the area of the plate of the central support foot 3, breaking it into two parts, and on the other hand, in the area of the spikes 4, where the stiffener 5 passes, there is also a reinforcement of the spike 4 itself, which enters the end of the board not with a plane, but with an angle (see Fig.3). Thus, both the plate of the central support foot 3 and the areas of the spikes 4, which are included in the area of the body of the boards, are strengthened. As a result, the risk of bending the plate of the central support foot 3 is significantly reduced in comparison with the prototype.

Support legs 2 are needed to rest against the end of the log, while spikes 4 enter the ends of the boards.

Fasteners for fastening the terrace board are used as follows.

After cutting all the boards for the terrace to the required size, install the first board on the logs as shown in Fig.5 and screw it to them.

Then, they take the fasteners and drive it with a spike into the end of the first board, while resting the extreme support legs on the support log (see Fig.6). After that, this fastener is screwed with a screw (see Fig.7) or fixed with a nail.

Then a second fastener is installed and driven in with a spike into the same end of the board, but with fixation on another log (see Fig. 8), after which it is also fixed with a screw (see Fig. 9) or a nail.

Then, using an auxiliary bar, the second terrace board is knocked onto the free spikes until the required interval between the boards is maintained (see Fig. 10) or until the board rests on the board.

To the second board, take the third fastener and drive it with a spike into the end of the first board, while resting the extreme support legs on the support log (see Fig.11). After that, this fastener is screwed with a screw (see Fig.12) or fixed with a nail.

Then a second fastener is installed and driven with a spike into the same end of the board, but with fixation on another log (see Fig.13), after which it is also fixed with a screw (see Fig.14) or a nail.

Then, using an auxiliary bar, the third terrace board is knocked onto the free spikes until the required spacing between the boards is maintained or until the board rests completely against the board.

The actions are repeated in the manner described above until all boards are completely laid on the logs.

When installing boards according to the prototype, an important installation condition is the need to stand on the board in order to maintain downward pressure while driving the spikes. Also, an important condition when using it is to insert the spike into the board straight and evenly so that the protruding spike remains parallel to the beam.

In our utility model, these conditions are not required to be met.

From Fig.5 - Fig.14 it can be seen that the master deliberately drove in the spikes at an angle (see Fig.7, Fig.8), without being puzzled by the question of the parallelism of the beam. Thus, the claimed fasteners significantly speed up the process of installing a decking board in time. This was achieved because the shape of the fastener is less prone to bending, and even when driving spikes at an angle into the ends of the boards, the fastener still performs its function, as it holds its shape more rigidly than Sharkstooth fasteners according to the prototype. Fasteners also effectively enter the end of the board having knots (see Fig.11).

When testing a prototype according to the utility model, the weakest version was used (see the sample of Fig.15), which was without a stiffener 7, which was made by a ledge at the bend of the central support tab 3. This showed that the main function of strengthening the strength is the longitudinal stiffener 5, passing from one spike 4 to another in the plate of the central support foot 3.

When using the option according to Fig.1, containing a stiffener 7, which is made with a ledge at the bend of the central support tab 3, an even greater increase in the strength of the fastener was observed, which was almost not subject to any bends and the tabs 2 retained their parallelism relative to the tab 3 even when clogging spikes 4 of these fasteners in the ends of the boards with knots.

Claims (4)

1. A hidden fastener for a terrace board, consisting of a base made in the form of a plate with holes for fastening and support legs bent from the base by 90 °, and the support legs located at the edges of the base are bent in the direction opposite to the central support tab, which is located in height above the extreme support tabs and is formed by a double-sided spike, in the middle part of which a protrusion is made, characterized in that from one tip of the spike to the other tip of the spike, a stiffening rib is made on the plate of the central support tab. 2. Fasteners for decking according to claim 1, characterized in that the stiffener is also made with a ledge at the bend of the central support foot. 3. Fasteners for decking according to claim 1, characterized in that each spike of the central foot is formed by the top of an acute angle ≤ 48°. 4. Fasteners for decking according to claim 1, characterized in that the holes for fastening in the base are made in the amount of three pieces and are oriented vertically, and the central hole is made of a smaller diameter than the outer ones.

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