JP5755073B2 - Mounting structure for connecting metal fittings in mineral panels - Google Patents

Description

  The present invention relates to a mounting structure for connecting metal fittings in a mineral panel, and more particularly, to a structure in which connecting metal fittings for supporting the mineral panel are attached to the mineral panel on columns and vertical frames that are erected on both sides. Is.

  Conventionally, it is known that a partition panel is configured by attaching stone panels using natural stone plates, artificial marble, tiles or ceramic panels (hereinafter referred to as “mineral material panels”) to columns or frames.

  For example, Patent Document 1 has a structure in which an insertion plate portion of a connection fitting is inserted into a plurality of insertion grooves formed on the back surface of a stone plate, the connection fitting is attached to the back surface, and the connection fitting is attached to a connection angle with a screw. It is disclosed. Specifically, a pair of insertion grooves are formed on the back surface of the stone plate so as to approach each other toward the back, and the connection fitting is constituted by two connection members, and the insertion plate portion of each connection member is formed. After being inserted into the insertion groove, both connecting members are tightened in a direction approaching with bolts and nuts, and the stone plate portions between the two insertion grooves are sandwiched and held by both insertion plate portions.

  Patent Document 2 discloses a structure in which a hook-and-loop fastener is attached to the back surface of a stone tile, and the hook-and-loop fastener is attached to a fastener sheet attached to a construction part such as a wall or a panel.

  On the other hand, in Patent Document 3, a first locking edge protrudes upward at the front edge of the upper end of the mineral material panel, and a fixing piece extending upward from the first locking edge protrudes at the rear edge. The upper end of the mineral panel and the first locking edge and the fixed piece form a groove that opens upward, and the rear edge of the lower end of the mineral panel is engaged in the concave groove on the front side of the fixed piece. A leg piece having a shape that can be deformed downward, and a fixing panel is screwed to the downboard from the front side along the split panel along the front side of both downboards of the frame. A structure is disclosed in which the lower end of the leg piece of the upper divided panel is fitted and held from above, leaving a space above the first locking edge.

  However, the one described in Patent Document 1 requires a pair of insertion grooves having different inclination directions to be drilled in at least four locations of the stone plate, and each of the connecting fittings made of two connecting members is tightened with a bolt and a nut. There is a need to install while adjusting the condition, and there are many work processes, which tends to increase costs. Moreover, the attachment structure using the hook-and-loop fastener described in Patent Document 2 has a problem in attachment strength, and is difficult to apply to a general partition panel in which a block panel is attached to a column.

No. 04-042416 Japanese Utility Model Publication No. 06-008576 JP 2009-102850 A

  Therefore, in view of the above-mentioned situation, the present invention intends to solve the problem by supporting the mineral panel on the back of a mineral panel such as a stone panel, artificial marble, tile or ceramic panel, and a vertical frame of a column or a frame. It is in providing the attachment structure of the connection metal fitting in the mineral panel which can attach the connection metal fitting for doing easily and firmly.

  In order to solve the above-mentioned problems, the present invention provides a horizontally long upper connection along the upper and lower portions of the back of the mineral panel so as to support the mineral panel on the vertical frames of the pillars and frames standing on both sides. A mounting structure of a connecting metal fitting in a mineral panel formed by attaching a metal fitting and a lower connecting metal fitting, wherein two parallel grooves are formed along the upper and lower portions of the back surface of the mineral panel, The groove is an inclined groove inclined so that the deep part approaches the edge, the groove on the center side is a vertical groove perpendicular to the back surface, and the upper and lower connection fittings are joined to the back of the mineral panel. A vertical piece that protrudes on the edge side of the substrate and that engages with the inclined groove, and that engages with the vertical groove leaving an end on the center side of the substrate. Is applied to the first joint provided on the substrate between the inclined piece and the vertical piece. In to constitute a mounting structure of the connecting fitting in mineral panel, characterized in that the adhesive on the back of the mineral panel (claim 1).

  Here, it is preferable that the pair of the inclined piece and the vertical piece respectively formed on the upper and lower portions of the back surface of the mineral material panel are vertically symmetric (claim 2).

  Furthermore, in addition to the adhesion by the first joint part, the upper joint metal fitting and the lower joint metal fitting are double-sided pressure-sensitive adhesive tapes adhered to the second joint part provided at the end of the substrate closer to the center than the vertical piece. More preferably, it adheres to the back surface of the mineral panel.

  Further, it is more preferable that the first bonding portion of the substrate is formed by roughening the surface.

  The upper connection fitting has an attachment piece that is continuous with the upper end of the substrate and protrudes upward from the upper end of the mineral panel for attachment to the support column or the vertical frame, and above the attachment piece. A receiving piece is formed on the base plate, and the lower connection fitting projects a locking portion for locking to the receiving piece of the upper connection fitting at the lower back of the substrate.

  The attachment structure of the connecting metal fitting in the mineral panel of the invention according to claim 1 as described above is provided on the back surface of the mineral panel in order to support the mineral panel on the vertical frames of the columns and the frames erected on both sides. A mounting structure of a connecting member in a mineral panel in which a horizontally long upper connecting member and a lower connecting member are mounted along the upper and lower portions, respectively, and two parallel strips are provided along the upper and lower portions of the back surface of the mineral panel. The groove on the edge side is an inclined groove that is inclined so that the deep part approaches the edge, and the groove on the center side is a vertical groove perpendicular to the back surface. The metal fitting has a substrate to be bonded to the back surface of the mineral panel, and an inclined piece that engages with the inclined groove is provided on the edge side of the substrate, and the end of the central portion side of the substrate is left behind. And projecting a vertical piece that engages the vertical groove, and the inclined piece and the vertical piece. Adhesive applied to the first joint provided on the substrate between them is adhered to the back surface of the mineral panel, so that inclined pieces and vertical pieces projecting above and below the substrate are drilled in the upper and lower portions of the back surface of the mineral panel. The upper and lower fittings are connected to the bottom of the mineral panel by engaging with the inclined grooves and vertical grooves, respectively, and using the adhesive applied to the first joint provided between the inclined pieces and the vertical pieces. Despite the fact that the mounting work of the metal fittings to the mineral panel is extremely simple, both the bonding and mechanical engagement are used together, so the mounting strength is high, and the inclined and vertical grooves are connected to the inclined and vertical grooves. Since it fits, it can be installed in an accurate position. In particular, with regard to the mounting strength, the engagement between the inclined groove and the inclined piece provides a mechanical resistance against the peeling of the substrate from the mineral panel. It is necessary to displace the board of the metal fitting in the direction along the back of the mineral panel, but the adhesive is originally strong in the direction parallel to the adhesion surface, so the board cannot be displaced, and therefore strong mounting strength Is expressed.

  According to claim 2, since the pair of the inclined piece and the vertical piece respectively formed on the upper and lower portions of the back surface of the mineral panel is symmetrical in the vertical direction, the upper connection is achieved even if the mineral panel is turned upside down. A metal fitting and a lower connection metal fitting can be attached, or the upper connection metal fitting and the lower connection metal fitting can be attached to either the upper or lower portion of the mineral panel, and there is no mistake in the bonding process.

  According to a third aspect, the upper connecting bracket and the lower connecting bracket are affixed to the second joint provided at the end of the substrate closer to the center than the vertical piece, in addition to the adhesion by the first joint. The attached double-sided adhesive tape sticks to the back of the mineral panel, so the adhesive metal substrate is adhered to the mineral panel with the double-sided adhesive tape until the adhesive hardens, and the displacement of each joint surface is regulated. By doing so, a good bonding state can be obtained even if the bonding time is long, and the mineral panel can be transferred to the next work process even when the adhesive is in an uncured state, thereby improving the working efficiency. . Further, by using the adhesion by the first joint part and the adhesion by the second joint part, it is possible to attach the substrate of the connecting metal fitting using the wider surface of the mineral panel, and between the inclined groove and the inclined piece. Since the mineral panel and the substrate are adhered to each other with the double-sided adhesive tape at the second joint portion farthest from the engaging portion, it has a strong resistance to peeling due to the rotation of the substrate around the inclined piece. .

  According to the fourth aspect, since the first bonding portion of the substrate is formed by roughening the surface, the adhesive strength by the adhesive is remarkably increased.

  According to claim 5, the upper connection fitting has an attachment piece that is continuous with the upper end of the substrate and protrudes upward from the upper end of the mineral panel in order to be attached to the support column or the vertical frame. A receiving piece is formed above the mounting piece, and the lower connection fitting projects a locking portion to be engaged with the receiving piece of the upper connection fitting at the lower back of the substrate. At the top of the upper connecting bracket of the mineral panel attached to the lower part, the locking portion of the lower connecting bracket of the upper mineral panel is dropped from above and locked, and the mounting piece of the upper connecting bracket is attached to the column or vertical frame. By attaching to a plurality of mineral panels, it is possible to sequentially attach a plurality of mineral panels.

It is the partial front view of the partition panel constructed using the block panel to which the attachment structure of the connection metal fitting in the mineral material panel which concerns on this invention is applied. It is a partial exploded perspective view which shows the structure which attaches a block panel to a support | pillar. It is a disassembled side view which similarly shows the structure which attaches a block panel to a support | pillar. The block panel of a middle stage is shown, (a) is a partial rear view, and (b) is a side view. The lowermost block panel is shown, (a) is a partial rear view, and (b) is a side view. The uppermost block panel is shown, (a) is a partial rear view, and (b) is a side view. It is the vertical side view of the partition panel comprised by attaching a block panel to the front and back both sides of a support | pillar. It is the XX sectional view taken on the line of FIG.

  Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings. FIG. 1 shows a partition panel constructed by using a block panel to which a connecting structure for connecting metal fittings in a mineral panel according to the present invention is applied. FIGS. 2 to 8 show the main parts thereof. 2 is a top rail, 3 is a column, 4 is a block panel, 5 is a mineral panel, 6 is an upper connecting bracket, and 7 is a lower connecting bracket.

  In this embodiment, the partition panel is provided with a plurality of support columns 3 erected at predetermined intervals between the ground rail 1 fixed to the floor surface F and the top rail 2 fixed to the ceiling S, and adjacent two support columns 3. , 3 is attached to both ends of the block panel 4, and a plurality of block panels 4,. The block panel 4 is mounted with a horizontally long upper coupling metal 6 along the upper part of the back surface of the mineral panel 5 and a horizontal long lower coupling metal 7 along the lower part. Is attached to the surface side of both supports 3 and 3 with screws 8, and the lower connecting bracket 7 of the upper block panel 4 is locked to the upper connecting bracket 6 of the lower block panel 4, and the upper connecting bracket 6 is connected to both supports. Attach to the upper surface in the order of attaching to the surface side of 3 and 3 with the screw 8. In the present embodiment, the middle block panel 4, the lowermost block panel 4A, and the uppermost block panel 4B are slightly different in the structure of the connecting bracket, but the essential parts of the invention are common.

  As shown in FIG. 2, the support column 3 is made of an aluminum extrusion mold material, and the support grooves 9 and 9A are formed on both the front and back surfaces so as to extend vertically on both sides and the center. In 9, 9A, the aspect ratio of the depth to the lateral width is set to 2 or more. Here, support grooves 9 and 9 are formed on both sides of the surface of the column 3, and a support groove 9A is formed in the center. A screw 8 can be screwed into these support grooves 9 and 9A with a sufficient tightening force. Here, it is preferable to use a tapping screw as the screw 8. Further, only the support grooves 9 and 9 may be provided on only one surface of the support column 3.

  The present invention is characterized in that an upper connecting bracket 6 and a lower connecting bracket 7 are simply and firmly attached to the upper and lower portions of the back surface of a rectangular mineral panel 5 made of stone panel, artificial marble, tile, ceramics panel or the like. Yes. The upper connecting bracket 6 and the lower connecting bracket 7 are made of an aluminum extrusion mold material, and it is preferable to cut and cut an appropriate length into an appropriate shape and use it.

  More specifically, as shown in FIGS. 2 to 4, the mineral panel 5 has two parallel grooves formed along the upper and lower portions of the back surface 10, and the groove on the edge side has a deep edge. The inclined groove 11 is inclined so as to approach the portion, and the groove on the center side is a vertical groove 12 perpendicular to the back surface. These inclined grooves 11 and vertical grooves 12 may be formed over the entire length of the mineral material panel 5 in the lateral direction. The inclined groove 11 and the vertical groove 12 which are paired in the upper and lower parts are symmetrical on the top and bottom of the mineral panel 5, and are the same even if the mineral panel 5 is turned upside down.

  The upper connection fitting 6 has a substrate 13 to be joined to the back surface 10 of the mineral panel 5, and an inclined piece 14 (upward inclination) that engages with the upper inclined groove 11 on the edge side of the substrate 13. A vertical piece 15 that protrudes and engages with the vertical groove 12 leaving an end on the center side of the substrate 13 is provided to project the substrate 13 between the inclined piece 14 and the vertical piece 15. A first joint 16 is provided, and a second joint 17 is provided at the end of the substrate 13 closer to the center than the vertical piece 15. And as shown in FIG. 3, while applying the adhesive 18 to the 1st junction part 16 of the said upper connection metal fitting 6, while the double-sided adhesive tape 19 was affixed on the 2nd junction part 17, the said inclination piece 14 is attached. Is engaged with the inclined groove 11 of the mineral panel 5 obliquely and then rotated so that the substrate 13 is bonded to the back surface 10, and the mineral panel 5 and the substrate 13 are bonded to each other by the adhesive 18. It is attached by adhesion with an adhesive tape 19.

  Next, although the said lower connection metal fitting 7 is demonstrated, since the basic composition is the same as that of the said upper connection metal fitting 6, it attaches | subjects and demonstrates the same code | symbol to the same structure. That is, the lower connecting bracket 7 has a substrate 13 to be joined to the back surface 10 of the mineral panel 5, and an inclined piece 14 (downward facing) that engages the lower inclined groove 11 on the edge side of the substrate 13. And a vertical piece 15 that engages with the vertical groove 12 leaving an end on the central side of the substrate 13, and a substrate between the inclined piece 14 and the vertical piece 15. Reference numeral 13 denotes a first joint portion 16, and a second joint portion 17 is provided at an end portion of the substrate 13 closer to the center than the vertical piece 15. And although not shown in figure, while the adhesive 18 is apply | coated to the 1st junction part 16 of the said lower coupling metal 7, the said inclined piece 14 is made into the said mineral in the state which stuck the double-sided adhesive tape 19 to the 2nd junction part 17. After engaging the inclined groove 11 of the quality panel 5 from the oblique direction, the substrate 13 is rotated so that the substrate 13 is bonded to the back surface 10, and the mineral panel 5 and the substrate 13 are bonded by the adhesive 18 and the double-sided adhesive tape 19. Install by sticking through.

Here, the first bonding portion 16 of the substrate 13 is preferably formed by roughening the surface because the adhesive strength is high, and specifically, a fine uneven pattern is formed in the longitudinal direction.
Adhere to the back of the mineral panel. Generally, quick-drying adhesives are brittle and inferior in adhesive strength, but adhesives with strong adhesive strength tend to have a long curing time. In the present embodiment, even if an adhesive with a long curing time is used, the mineral panel 5 and the substrate 13 of the upper connecting bracket 6 and the lower connecting bracket 7 are adhered by the double-sided adhesive tape 19, so that they may be moved. However, since the bonding surface does not shift, adhesion failure does not occur. In other words, in the present invention, after the upper coupling metal 6 and the lower coupling metal 7 are bonded to the mineral material panel 5, it is possible to move to the next work process without leaving it stationary, so that the work efficiency in manufacturing is greatly improved. .

  Next, a structure in which the block panel 4 is attached to the support column 3 and attached in a stacked manner in the upward direction will be described. Therefore, the upper connection fitting 6 has an attachment piece 20 that is continuous with the upper end of the substrate 13 and protrudes upward from the upper end of the mineral panel 5, and a receiving piece 21 is provided above the attachment piece 20. Forming. The mounting piece 20 is formed in a stepped shape at the upper end of the substrate 13 so that it can be joined to the surface of the support column 3, and the receiving piece 21 is formed in a stepped shape from the upper end of the mounting piece 20. A gap is formed between the surface of the support column 3 and the receiving piece 21. A brush-like sealing material 22 is attached along the back side of the receiving piece 21. Further, the mounting piece 20 has a portion projecting upward from the mineral panel 5, and a horizontally elongated hole 23 through which the screw 8 is inserted is formed at both end portions of the exposed portion. In the present embodiment, the laterally long holes 23 are provided with a pair of four vertically spaced pairs on each side so as to be applicable to various mounting modes. Two pairs are provided on the upper and lower sides when the screw 8 fails to be screwed using one horizontally long hole 23 or when the screw 8 once screwed is removed and screwed again. In order to prevent the strength from being lowered when screwed, it is possible to screw into the same support groove 9 using another laterally long hole 23. Of course, it may be used for the purpose of increasing the mounting strength by screwing in two places at the top and bottom. In the present embodiment, a single or a plurality of screw holes are also formed in the left and right central portions of the mounting piece 20.

  On the other hand, the lower connecting bracket 7 has a locking portion 24 protruding from the lower surface 10 of the substrate 13 for locking to the receiving piece 21 of the upper connecting bracket 6. Here, the locking part 24 is joined to the surface of the support column 3 on the back side, and as shown in FIG. 3, the locking part 24 is dropped into the receiving piece 21 of the upper connection fitting 6 of the lower block panel 4. In the combined state, the seal material 22 is contacted to prevent rattling and airtightness and soundproofing are maintained.

  A strip-shaped seal 25 is stuck around the mineral panel 5. Although not shown, it is desirable to form a shallow groove on the periphery of the mineral panel 5 and to embed and paste a part of the dry seal 25 in the groove.

  Next, the lowermost block panel 4A and the uppermost block panel 4B will be briefly described. In either case, a common mineral material panel 5 is used. As shown in FIG. 5, the lowermost block panel 4 </ b> A has the upper connecting bracket 6 similarly attached to the upper portion of the back surface 10 of the mineral panel 5, and the upper and lower portions of the substrate 27 of the lower connecting bracket 26 at the lower portion. The double-sided adhesive tapes 28 and 28 are attached to the back surface 10 of the mineral material panel 5. Then, a downward locking piece 29 is projected on the upper edge of the substrate 27 of the lower connection fitting 26, and a sealing material 30 that contacts the side surface of the ground rail 1 is attached to the lower edge of the substrate 27 over the entire length. doing. Further, in the lowermost block panel 4 </ b> A, the seal 25 is attached only to both side surfaces and the upper surface of the mineral material panel 5. Thus, the joint part of the mineral panel 5 is formed and the seal 25 is provided at the edge, so that the joint part can be closed without caulking. Alternatively, the seal 25 acts as a backing material by filling the front side of the seal 25 located at the joint with a caulking agent.

  Further, as shown in FIG. 6, the uppermost block panel 4B has the lower connecting bracket 7 attached to the lower portion of the back surface 10 of the mineral panel 5 in the same manner, and the upper connecting fitting 31 similarly to the upper portion. Install. That is, the upper connection fitting 31 has the same structure as the substrate 13 of the upper connection fitting 6, has an extension 32 upward from the upper end of the substrate 13, and protrudes upward from the mineral material panel 5. An attachment piece 33 for attaching to the support column 3 is formed in a stepped shape above the extension portion 32, and an exposed portion including the attachment piece 33 is covered with a cover member 34. The same components as those of the upper connecting bracket 6 are denoted by the same reference numerals, and the description thereof is omitted. In the uppermost block panel 4 </ b> B, the seal 25 is attached only to both side surfaces and the lower surface of the mineral material panel 5.

  Then, as shown in FIGS. 1 to 3, 7, and 8, first, the receiving metal fitting 35 is screwed using the support groove 9 above the ground rail 1 below the support column 3. Then, the downward engaging piece 29 of the lower connecting bracket 26 provided at the lower portion of the lowermost block panel 4A is engaged with the upward protruding piece 36 of the receiving bracket 35, and the upper connecting bracket 6 provided at the upper portion is attached. Screw both sides of the piece 20. Then, the locking portion 24 of the lower connecting bracket 7 of the block panel 4 is brought into contact with the surface of the column 3 and is slid downward to be locked to the receiving piece 21 of the upper connecting bracket 6 of the lowermost block panel 4A. The upper connecting bracket 6 is screwed to the support column 3 in the same manner as described above while finely adjusting the position of the panel 4. Similarly, the locking portion 24 of the lower connecting bracket 7 of the upper block panel 4 is locked to the receiving piece 21 of the upper connecting bracket 6 of the lower block panel 4, and both end portions of the upper connecting bracket 6 of the upper block panel 4 are locked. Is screwed to the supports 3 and 3 on both sides as described above. In this way, the plurality of block panels 4,... Are attached vertically on both front and back surfaces of the support columns 3, 3 on both sides. Finally, after engaging the locking portion 24 of the lower coupling metal 7 provided at the lower part of the uppermost block panel 4B with the receiving piece 21 of the upper coupling metal 6 provided at the lower block panel 4, the upper coupling metal Both side portions of the attachment piece 33 of 31 are screwed to the top rail 2. Then, the exposed portion including the mounting piece 33 is covered with a cover member 34.

  The mounting position of the block panel 4 can be finely adjusted. In that case, since the screw 8 is screwed into the block panel 4 at a position where the support groove 9 of the support column 3 and the horizontally long hole 23 of the mounting piece 20 intersect, the adjustment range is wide and the workability is excellent.

  When a plurality of block panels 4, 4 </ b> A, 4 </ b> B,... Are attached to both sides via the support column 3, the joint 25 between the mineral material panels 5, 5 is a seal 25 attached around the mineral material panel 5. , 25 contact each other so as to close the gap.

  If the interval between the adjacent columns 3 and 3 is wide and the block panel 4 may be bent to the front and back, the intermediate column 37 is placed between the columns 3 and 3 as shown in FIGS. And a tapping screw 38 inserted through a laterally long hole 23 provided in the left and right center portion of the mounting piece 20 of the upper connecting bracket 6 is screwed onto both the front and back surfaces of the intermediate support column 37.

  In the present embodiment, the structure in which the block panel 4 is attached to both the front and back surfaces of the support column 3 is shown, but the block panel 4 may be attached only to the front surface side of the support column 3.

1 ground rail, 2 top rail,
3 columns, 4, 4A, 4B block panels,
5 Mineral materials panel, 6 Upper connection bracket,
7 Lower connection bracket, 8 Screw,
9, 9A support groove, 10 back,
11 inclined grooves, 12 vertical grooves,
13 substrates, 14 inclined pieces,
15 vertical piece, 16 first joint,
17 second joint, 18 adhesive,
19 double-sided adhesive tape, 20 mounting piece,
21 receiving piece, 22 sealing material,
23 horizontally long holes, 24 locking portions,
25 Seal, 26 Lower coupling bracket,
27 substrate, 28 double-sided adhesive tape,
29 locking piece, 30 sealing material,
31 upper connecting bracket, 32 extension,
33 mounting piece, 34 cover member,
35 Bracket, 36 Projection piece,
37 intermediate struts, 38 tapping screws,
F floor, S ceiling.

Claims (5)

  Mineral material panel, which has horizontal upper and lower connecting brackets attached along the upper and lower parts of the back of the mineral panel in order to support the mineral panel on the vertical columns of the pillars and frames standing on both sides. In the mounting structure of the connecting bracket in FIG. 2, two parallel grooves are formed along the upper and lower portions of the back surface of the mineral panel, and the groove on the edge side is inclined so that the deep part approaches the edge part. The center side groove is a vertical groove perpendicular to the back surface, and the upper connection metal fitting and the lower connection metal fitting have a substrate bonded to the back surface of the mineral panel, and the edge side of the substrate And an inclined piece that engages with the inclined groove and a vertical piece that engages with the vertical groove leaving an end on the center side of the substrate. Adhering to the back of the mineral panel with adhesive applied to the first joint provided on the substrate between Mounting structure of the connecting fitting in mineral panel, characterized in that.   The attachment structure of the connecting metal fitting in the mineral panel according to claim 1, wherein the pair of the inclined piece and the vertical piece respectively formed on the upper and lower portions of the back surface of the mineral panel is vertically symmetrical.   The upper connecting bracket and the lower connecting bracket are a double-sided adhesive tape attached to a second bonding portion provided at an end portion of the substrate on the center side of the vertical piece in addition to the bonding by the first bonding portion. The attachment structure of the connection metal fitting in the mineral panel of Claim 1 or 2 which adheres to the back surface of a mineral panel.   The mounting structure for a connecting metal fitting in a mineral panel according to any one of claims 1 to 3, wherein the first joint portion of the substrate is formed by roughening the surface.   The upper connection fitting has an attachment piece that is continuous with the upper end of the substrate and protrudes upward from the upper end of the mineral panel for attachment to the support column or vertical frame, and is received above the attachment piece. A piece is formed, and the lower connection fitting projects from the bottom lower part of the substrate a locking portion for locking to the receiving piece of the upper connection fitting. Mounting structure for connecting metal fittings in the mineral panel described in 1.

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