JPH07509030A - Assembly system of juxtaposition/parallel laths - Google Patents

Abstract

The invention discloses a system for fixing slats (20), made of wood or similar material, and forming particularly a floor. The system allows to fix the slats (20) in a juxtaposed arrangement without damaging the slats owing to the use of tongues (10) wherein bearing elements (12) provided with teeths have been swaged. Said tongues (10) are placed on the subfloor (11) and are either fixed directly or held in place by gravity by means of flexible rubber supports (8) and of alignment slats (70) which maintain them at equal distance with respect to each other, thus without causing any damage to the subfloor (11). This fixing system provides for an easy installation and dismounting of slats (20) and is particularly appropriate for prevarnished wooden slats (20).

Description

[Detailed description of the invention] Assembly system of juxtaposition/parallel laths The present invention is made of wood and has a pre-varnished surface to create a ruled pattern on the surface of the floor or wall. This invention relates to an assembly system for juxtaposition/parallel lath assemblies. These laths are It has a tenon at one end and a mortise at the other end in the direction of the hand axis. When installing the lath, Make sure the tenon fits into the mortise in the adjacent lath.

Until now, the most widely used methods for creating ruled lines on wood have been using nails or metal. Attach the board directly to the subfloor using a tool and an air hammer. Is Umono. These nails and metal fittings firmly fix the lath to the subfloor, but these penetrates relatively dry wood, causing small visible scratches on the surface of the lath. let Also, nails and metal fittings can cause partings that go up (7) to the surface of the wood grain. In other words, a lath with such scratches is of no use.

Therefore, until now, when the lath was installed in perfect alignment with the subfloor, There was no guarantee. For example, if there is a narrower board in the middle of the row, or one board is narrower than the others, The alignment of the laths was disturbed due to factors such as the laths being upwardly sloping. . The laths also each have a small angular slope, making the entire lath train look like part of a cylinder. This can be felt by the human body when the surface becomes large. I'm going to growl.

Traditional lath placement methods often result in scratches that can ruin the floor surface. There are times when I can do it. Furthermore, it is very difficult to remove the lath without damaging it. It is common for the lath to break during the process. I wanted to do it, but when I moved, I If the floor cannot be removed, or if the floor is to be temporarily covered for display, etc. In some cases, it may become impossible to install or remove the device.

Floor laths installed in the traditional manner press against each other during periods of high humidity, resulting in When it shrinks during drying, large gaps may be created in some places.

Also, when the floor lath is worn and needs to be sanded and varnished, these treatments Even if you try to apply it elsewhere, it cannot be removed. For this reason, this research Polishing and varnishing may be inconvenient for both the homeowner and the worker, but the installation can be done on-site. I have no choice but to. Also, when sanding and varnishing wood flooring in homes and commercial buildings, Therefore, we will have to temporarily vacate the premises during this repair work period, which will take several days. It disappears. Then, if you perform this Supplement 1 (1), dust will be everywhere due to polishing of the flooring material. The virus spreads and the entire house or building has to be cleaned. Furthermore, for polishing The machines used can cause permanent damage to the floor if not handled properly. , 79 trained workers are required. Also, many varnishes and other finishes are harmful. Sometimes explosive vapors or very strong vapors that harm the health of workers and pollute the air in homes and buildings. Gives off an odor. Therefore, do not use this for as long as necessary for the varnish to dry and harden. The room will be unusable.

In order to eliminate the drawbacks associated with polishing and varnishing the lath at these places of use, Varnished lath is commercially available. When these are worn out, polish and re-polish them. Sent to factory for varnishing. In factories with suitable equipment, these processes can be carried out. can be carried out without harming the health of workers. At the factory, volatilized (each Sections can also be filtered.

For example, the following patent describes a method and system for removing the Rano without damaging it. Described in: US-A-1968798, US-A-2004917, CA-A-898480, CA-A-903436, CA-A-965569 and CA-A-1165088゜These systems secure the lath without damaging it. Therefore, various Jfa installations that slide on parallel rails across the lath are I am suggesting tools. When using a fixture for this installation, remove the fixture for movable installations. then remove the wooden lath. However, this system places the lath at a time and You can put it away (simultaneous placement of laths) or stack it on top of an existing ruled line pattern without damaging it. There is no mention of rough installation.

US-A-3187389, US-A-4272938, CA-A-40536 6 and CA-A-571352 patents allow individual installation locations without causing major damage. We are proposing metal fittings to fix it to. However, these fittings do not allow simultaneous lath placement or It does not solve the problem of installing laths over existing ruled patterns without damage. difference Furthermore, this metal fitting may break when removed.

US-A-1988201 discloses the method of fixing a board folded together by placing it under the lath. We are proposing a system that However, this system requires large amounts of metal and Moreover, it does not solve the problem of installing laths on existing ruled patterns without damaging them. stomach. Furthermore, the lath must be run through a special machine during use.

CA-A-579973 is a metal tongue (tag) formed by stamping, A system with interlocking groove and mortise installation tools is proposed.

However, this installation requires that the fittings be bent to fit the shape of the groove and mortise. This will result in permanent deformity. Therefore, when removing the lath, this attachment is must be broken and the tongue must be replaced. Furthermore, this system The system also solves the problem of installing laths over existing crease patterns without damage. do not have.

The present invention allows juxtaposed parallel laths, especially pre-varnished laths, to be removed without damaging them. , and a system for assembling with complete consistency and simultaneous placement. provide a program. The present invention also allows the lath to be installed over an existing ruled pattern without damage. We also provide systems.

The system of the present invention can be tightened using conventional methods, is reusable, and is durable. It is possible to use a standard plate that does not itself need to be removed when removing the base. It has the advantage of

Another advantage of the invention is that even people with little experience in this field can easily The installation of the lath has been simplified so that you can attach the lath yourself using a tool. That is.

Therefore, the present invention provides a system for assembling juxtaposed and parallel laths that form a ruled pattern on the surface. The system proposes a stem in which each lath has a predetermined width and has a top and bottom surface as well as a tenon. two ends each having a mortise and a mortise (the mortise is inserted into the mortise of the adjacent lath) ). This assembly system includes: - thin strips parallel to each other and containing the bottom lath plate on the surface to be ruled; A set of stiff, rigid rabbets extending transversely to the lath; a set of means for fixing in position; and - a set of supports projecting above the tongue; Sets spaced apart from each other by the same distance as the width of the lath to be assembled.

The features of this assembly system are as follows.

- the support tube has an upper end with at least one tooth approximately parallel to the tongue; The holders and teeth are formed by stamping the tongues. one tooth protrudes in the same direction as the tongue, and said support and this tooth are so that the laths are spaced evenly apart from each other while preventing the laths from lifting up. , having dimensions such that a chisel is inserted into this mortise.

One & tongue supports are aligned with adjacent tongue supports.

According to a first preferred aspect of the invention, the means for fixing the rabbets in position with respect to each other include: This is the hole that goes through the tongue, and the screw goes through here. This screw has a flat head and a tongue to secure it. Screws onto a rough mounting surface for attachment.

According to a second preferred aspect of the invention, the system comprises the following aids: a side wall projecting downwardly and extending in the axial direction; and a flexible support member that corresponds to the tongue. You can hold it like a vise.

- an alignment lug placed perpendicular to the tongue while fitting into an aperture formed in the side wall of the tongue; means for holding the rabbets in place relative to each other, including a set of The tongue has a side edge with a pair of symmetrical notches that fit into the hole in the tongue side wall. and intersect the rabbets while passing through the flexible support member. This aligned lath is When the alignment lath intersects the rabbets, each lattice is positioned so that it fits into a notch in the alignment lath. It will be done.

The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. You will understand.

1 is a plan view of a tongue according to a first preferred embodiment of the invention; FIG. 2 is a plan view of a tongue according to a first preferred embodiment of the invention; A side view seen from the longitudinal direction of the tongue lath for fixing the lath according to the first preferred embodiment is; FIG. 3 is a side view of the tongue of FIG. 2, viewed from a direction perpendicular to the longitudinal direction of the lath: FIG. 4 is a plan view of the tongue and lath when assembled according to the first preferred embodiment of the present invention. It is.

FIG. 5 is a plan view of a tongue according to a second preferred embodiment of the invention; FIG. FIG.

FIG. 7 is a plan view of the flexible support member; FIG. 8 is a plan view of the flexible support member; Fig. 2 is a side view of the tongue lath that fixes the lath, seen from the longitudinal direction: FIG. 9 is a side view of the tongue of FIG. 8, viewed from a direction perpendicular to the longitudinal direction of the lath; FIG. 1O is a plan view during assembly of a tongue and lath according to a second preferred embodiment of the present invention. It is a diagram.

The lath assembly system of the present invention, shown in Figures 1 through 10, is constructed from tempered steel. The tongue (10) has a support (12) projecting upwardly on the stand. formed by amping. The support (12) has two point-shaped points at its ends. The tooth (14) is folded 90” parallel to the surface of the tongue (10). It is curved, and the tip points slightly to one side. Support (12) and teeth (1 4) is formed by stamping. These are the laths (20) facing the ground. This is to prevent rain from pressing down and rising.

The lath (20) has an upper surface (22), a lower surface (24), and two ends (26) and (28). , and two side parts (30), (32). One side (30) has a label. A tenon (36) is provided that extends over the entire length in the longitudinal direction of the The side part (32) also has a mortise (38 ) is provided. Both ends (26) and (28) are provided with a mortise (38) and ( 40) is provided. A longitudinal groove (46) provided on the lower surface (24) of the lath prevents moisture. This is to prevent the lath (20) from making a 7-curve bend when the angle is high.

The lath (20) is preferably installed at the factory so that it does not require varnishing afterwards. It has a pre-varnished top surface (22). The floor is worn out or the color of the floor changes. If necessary, remove the lath (20) and send it to the factory for the necessary treatment. . However, sanding and varnishing can also be done stationary at the installation site if necessary. Wear.

The support (12) is equal to the distance between the lower surface of the lath (24) and the bottom of the mortise (38). It has a new height. The distance between two adjacent supports (12) is the lath (20) equal to the width of As shown in Figures 2 and 8, the meat (14) facing slightly - The mortise (38) is cut into the bottom surface, but the tenon (36) is cut into the top surface of the tooth. Space is reserved for insertion.

During the lath assembly, the tongues (10) are placed against each other on the surface (11) on which the lath is laid. arranged in parallel. The support (12) for the tongue (10) holds the lath (20) on the tongue (1). They must be aligned with each other so that they can be placed perpendicular to 0). Russ (20 ) are placed in turn in the direction pointed by the teeth (14).

First, as shown in Figures 2 and 8, each lath (20) in the first row has its mortise (38 ) is installed so that the bottom part of the support (12) fits under its teeth (14). It will be done. Laths (20) in the same row are placed end-to-end, but each lath is They do not need to be the same length. The lath (20) is then pushed down vertically and the hole ( 36) onto the next support (12). This next support (1 Each tooth (14) in 2) faces slightly upward, so when you press down on the lath, Its upper edge slightly bites into the tenon (36). For this reason, when loading the lath, these teeth It will not damage the next lath.

The next row of laths (20) are the supports (on which the tenons (36) of the first row of laths rest). 12). The bottom of the slot (38) is fitted with these supports. (12) so as to fit under the teeth (14) of the first row of laths. Fix the tenon (36). The 11j row of the lath (20) is thus firmly fixed. Ru. The other columns of the lath are processed in a similar manner until the width of the entire lath column is the desired width. is loaded with. The positions of both ends (26) and (28) of the lath (20) are It does not match that of the column. This makes the floor design more attractive. It can also increase the strength of the floor surface.

The main difference between the two preferred embodiments of the invention is that the rabbets (10) are held in place relative to each other. It lies in the means used for fixing.

In a first embodiment of the invention, illustrated in Figures 1 to 4, a rough paving surface ( 11) is a subfloor into which screws may be inserted. Sane (10) is Sane ( 10) to the subfloor (11) firmly into the hole (42) into which the screw (44) is inserted. What do you do? Each of these screws (44) also fits into a small recess around the hole (42). It has a flat head (45) that looks like this.

The rabbet (lo) does not always have exactly the right length, so the length can be shortened. cut off or adjust the ends to make the length slightly longer. It will be necessary to do this. In a first aspect of the invention, the cutting of the tongue (lO) Since the cutting is done along the mark (48), the lath is installed at once. It can be carried out.

The lath mounting system shown in this first embodiment can be applied to both floors and walls, and It can also be applied to ceilings.

According to a second preferred embodiment of the invention, as shown in FIGS. ) are not screwed to the subfloor (11). Instead, perpendicular to the tongue (10) They are secured in position to each other using alignment laths (70) provided. Sane (10) is a flexible piece of rubber or other similar material that extends the entire length of the tongue. It is installed on the support member (80). In the second embodiment, the lath attachment is is fixed on the lath installation surface only by gravity. This damages the existing floor surface. It can be installed directly on this "2" without having to do so. Also, it can be installed directly on the floor. If it is not appropriate to install a carpet over the If so, remove the existing carpet and install it directly on the floor. You may.

The method of holding the lath in place by gravity is a method that allows building tenants to modify the existing floor surface. If you do not have the right to use the product, or if you are moving, you may have to take it with you to the new location. If you plan to use it again, use it as a temporary exhibition in a rustic building or an apartment. Sometimes especially useful.

In this second preferred embodiment, the tongue (lO) projects downwardly and the entire length of the tongue. It has a longitudinally extending side wall (90). This side wall (90) is a flexible support Tighten the member (80) like a vise. The lower part of the side wall (90) is shown in FIG. As such, it rests on the proximal side (82) of the flexible support member (80). Side wall (90 ) can hold the flexible support member [80] more effectively. Therefore, the support member (80) can be tightened. For this reason, the visibility support The side wall of the material (80) has a longitudinal groove (84) that accommodates and restrains this expansion (92). Equipped with

The side wall (90) of the tongue has an opening (9) through which the alignment lath (70) crosses. 4) are provided at equal intervals. The width of the opening (94) is greater than the width of the alignment lath (70). narrow. However, as shown in Figure 6, the alignment lath (70) has two on each side. Pairs of notches (72) are provided at equal intervals. Notch in the same measuring section (72) The distance between the pairs of is equal to the width of the tongue (10). The alignment lath (70) is for cutting. It can be easily shortened by cutting along the mark (74), making it easy to attach the lath. can be done at once. The alignment lath (70) and the tongue are the height of the tongue (10) is combined with

To construct this assembly system, first install the flexible support member (80) and Then, perpendicularly to this, align the alignment lath (70) with the tongue opening (94) that will be provided later. Install it while 1. Once the entire assembly system is accurately aligned, the flexible section Place the tongue (10) on top of the lumber (80) and align it with the alignment lath (70). difference The teeth (10) are arranged such that their teeth (14) all face in the same direction.

As shown in Figure 10, the lath (20) is installed in the same manner as in the first embodiment described above. will be carried out.

The last row of laths (20) are attached using auxiliary means to avoid protrusions. . If the last row of laths (20) stick a little to the wall, for example Dorant [quadranLl is used to install, but other methods are also possible. .

The lath assembly system described above is very labor intensive for straightening a bowed lath (20). It is dynamic. This is because each support (12) acts as a vise. This is because even the lath remains straight. In other words, using this assembly system, , to limit moisture stress and keep the laths (20) in close contact with each other. I can do it. Furthermore, since the last (20) is placed on the second part of the tongue (10), the last There is no direct contact with the subfloor, which may contain moisture. In this way, the present embodiment According to the system, laths that have expanded due to excess moisture are occupied by adjacent laths. air spaces between the laths, even when the humidity drops later will not occur.

In this embodiment, since nails that penetrate the lath (20) are not used, Even if a person walks on it, there is little risk of cracks occurring. fruit In this case, the present invention eliminates the need for large rack holes that would otherwise occur with the conventional method of using nails. Therefore, when a crack occurs, two parts of the same lath (20) They don't rub against each other and make any noise. The present invention prevents the lath (20) from being damaged. You can solve this problem by keeping the

Finally, the floor pattern can be changed to various patterns by changing the surface layer of the lath. I can do it. Additionally, to match the desired design, a certain angle to the tongue can be adjusted. It is also possible to make the support (12) parallel to the longitudinal axis of the tongue. Ru.

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Claims (1)

[Claims] 1. A parquet flooring system in which boards (20) are placed on top of the floor (11). The plates (20) are arranged in parallel, and each plate (20) has a predetermined width and has a top surface ( 22), a lower surface (24) and both ends (26, 28), and one end of each plate has a tenon ( 36), the other end is provided with a mortise (38), and the tenon (36) of each board is connected to the adjacent board ( 20) is a system inserted into the mortise (38) of They are placed parallel to each other on the floor (11) covered with boards, and while containing the bottom surface of the board (20). a set of rigid tongues (10) extending in a direction intersecting the plate (20); A device for holding the tongues (10) in place relative to each other and a plate (20) projecting upwardly. supports arranged on the tongues (10) spaced apart from each other at intervals approximately equal to the width of the a set of tools (12), and the system has the following features: Each support (12) has at least one tooth (14) substantially parallel to the tongue (10). said tooth (14) has an upper surface bent at approximately 90° to form a each support (12) is bent in the same direction so that the tenon (36) of the plate (20) 4) is large enough to be placed on top of the tenon of the other board (20). The holes (38) are arranged parallel to each other so that the plate (20) does not lift up. It can be fitted around the tenon (36) and the corresponding tooth (14). and the tongues (10) are arranged parallel to each other on the floor (11), each tongue (10) The support (12) provided on the tongue is perpendicular to the support (12) of the other tongue (10). The top surface of each board is aligned so that the tenons of each board are inserted into the mortises of the adjacent board. When finished, it forms a continuous parquet surface. 2. At least one tooth (11) of the claim has a slightly upwardly projecting point. A parquet flooring system according to scope 1. 3. Flow of parquet work according to claim 2, wherein the number of teeth (14) is 2. ring system. 4. Said plates (20) are all of the same width, and the support (12) of each tongue (10) is 20) are installed at the same distance so that they can be installed at the same time. The parquet flooring system described. 5. Parquet according to claim 4, wherein the board (20) has a groove (46). flooring system. 6. Said board (20) is made of wood and its upper surface (22) is pre-varnished. A parquet flooring system according to scope 4. 7. The device for holding said tongues (10) in place with respect to each other includes including a plurality of holes (42) that provide a rigid connection between the tongue (10) and the floor. A screw (44) with a head (45) is threaded so as to form a The parquet flooring system according to any one of Item 6. 8. Claim 7, wherein the plurality of holes (42) are provided at regular intervals. Parquet flooring system. 9. An installation system for assembling a board (20) on a floor (11), the board (20) They are arranged in parallel, and each plate (20) has a predetermined width, and further has an upper surface (22) and a lower surface ( 24] and both ends (26, 28), each plate has a tenon (36) at one end and a tenon (36) at the other end. is provided with a mortise (38), and the tenon (36) of each board is connected to the tenon of the adjacent board (20). The system is inserted into holes (33) and parallel to each other on the floor (11) covered with boards. A rigid member is arranged and extends in a direction intersecting the plate (20) while accommodating the lower surface of the plate (20). A set of sex tongues (10), A device for holding the tongues (10) in place relative to each other and a plate (20) projecting upwardly. supports arranged on the tongues (10) spaced apart from each other at intervals approximately equal to the width of the a set of tools (12), and the system has the following features: 1 Each support (12) has at least one tooth (14) substantially parallel to the tongue (10). said tooth (14) has an upper surface bent at approximately 90° to form a each support (12) is bent in the same direction so that the tenon (36) of the plate (20) 4) It is large enough to be placed on top of it. Tenon on another board (20) 6 (38) are arranged parallel to each other so that the plate (20) does not lift up. It can be fitted around the tenon (36) and the corresponding tooth (14). and the tongues (10) are arranged parallel to each other on the floor (11), each tongue (10) The support (12) provided on the other tongue (10) is perpendicular to the support (12) of the other tongue (10). and the tongue is provided between the floor (11) and the tongue (10). 10. placed on a flexible support member (80); The flexible support member (80 10. System according to claim 9, in which the rabbets (10) extend in the longitudinal direction of the tongues (10). 11. A system according to claim 10, wherein the flexible support member (80) is made of wood. stem. 12. The tongues (10) each grip a corresponding support member (80). It has a side wall (90) projecting downwardly and extending in the longitudinal direction of the tongue (10). death: The device for holding said tongues (10) in position with respect to each other is arranged perpendicularly to the tongues (10). and aligned with the side hole (94) formed in the side wall (90) of said tongue (10). a set of guide strips (70); said guide strips (70) , a symmetrical notch (72) that mates with the side wall (90) of the tongue around said side hole (94). ), and the guide strip (70) has side lines formed with pairs of tongues (). 10) and the flexible support member (80), crossing under the tongue (10). The tongue (10) and guide strip (70) are arranged so that the guide strip (70) Each tongue (10) fits into said notch (72) when passing under the tongue (10). 11. The system of claim 10, wherein the system is arranged to 13. The tongues (10) are arranged at regular intervals and the guide strips (70) 13. The system according to claim 12, wherein the notches (72) of the Mu. 14. The side wall (90) of said tongue (10) is such that the tongue (10) is attached to a flexible support member ( 80) has a plurality of pairs of inflatable parts (92) that can be gripped more effectively. 13. The system according to claim 12. 15. The system is held in place by gravity on the surface to be covered with the plate. 13. The system according to claim 12. 16. A system according to claim 1, wherein said tongue (10) is made of tempered steel. Tem. 17. 13. The guide strip (70) according to claim 12, wherein the guide strip (70) is made of metal. system. 18. To cover the surface (11), wooden boards (2 0), in which each board (20) is pre-varnished. It has a top surface (22), a bottom surface (24) and both ends (26, 28), with one end of each plate having a A tenon (36) and a mortise (38) are provided at the other end, and the tenon (36) on each board is adjacent It is a system that is inserted into the mortise (33) of the board (20) that They are arranged parallel to each other on the surface covered by the plate (11) and accommodate the lower surface of the plate (20). a set of thin rigid tongues (10) extending in a direction intersecting the horizontal plate (20); A device for holding the tongues (10) in place relative to each other and a plate (20) projecting upwardly. supports arranged on the tongues (10) spaced apart from each other at intervals approximately equal to the width of the a set of tools (12), and the system has the following features: The supports (12) of each tongue (10) are the same so that the plates (20) can be installed at the same time. set at a distance; Each support (12) has at its upper end a pointed tooth (14) approximately parallel to the tongue (10). The support (12) and the tooth (14) are formed by stamping the tongue (10). be; Said teeth (14) are bent in the same direction and each support (12) and tooth (14) 14) is sized to engage with the mortise (38), and the tenon (36) is sized to engage the plate (38). 20) so that it does not lift up and the plates are placed at a specified distance from each other. inserted into the mortise; the device holding said tongues (10) in place relative to each other is inserted into the mortise; Contains a number of holes (42) passing through the tongue (10), in which the tongue (10) and the floor A screw (44) with a head (45) is threaded to form a rigid joint between the ; The supports (12) of each tongue (10) are aligned with the supports of the adjacent tongue (10) ; The tongue (10) is a mark that serves as a guide when cutting so that the board can be installed at once. Equipped with 19. To cover the surface (11), wooden boards (2 0), in which each board (20) is pre-varnished. It has a top surface (22), a bottom surface (24) and both ends (26, 28), with one end of each plate having a A tenon (36) and a mortise (38) are provided at the other end, and the tenon (36) on each board is adjacent It is a system that is inserted into the mortise (33) of the board (20) that They are arranged parallel to each other on the surface covered by the plate (11) and accommodate the lower surface of the plate (20). a set of thin rigid tongues (10) extending in a direction intersecting the horizontal plate (20); A device for holding the tongues (10) in place relative to each other and a plate (20) projecting upwardly. supports arranged on the tongues (10) spaced apart from each other at intervals approximately equal to the width of the a set of tools (12), and the system has the following features: Said tongues (10) are arranged at regular intervals and are arranged at regular intervals to form a groove in said guide strip (70). The catches (72) are also provided at regular intervals; the supports (12) of the male tongue (10) are Provided at the same distance so that the boards (20) can be installed at once; Each support (12) has at its upper end a pointed tooth (14) approximately parallel to the tongue (10). The support (12) and the tooth (14) are formed by stamping the tongue (10). Will be: Said teeth (14) are bent in the same direction, each support (12) and a plurality of teeth (14) , the two teeth (14) are sized to engage the mortise (38), and the tenon ( 36) so that the plate (20) does not lift up and that the plates maintain a specified distance from each other. inserted into the mortise to be placed; said tongue (10) is provided between the tongue and the covering surface; disposed on a rubber flexible support member (80) extending in the longitudinal direction of the tongue (10). said tongues (10); each tongue (10) has a corresponding support member (80); a longitudinally extending side wall (90) of the tongue (10) projecting downwardly for gripping; has; The device for holding said tongues (10) in place relative to each other is arranged perpendicularly to the tongues (10). placed and aligned with a side hole (94) formed in the side wall (90) of said tongue (10). Includes a set of guide strips (70).