Staircase connection parts

Abstract

To provide a joint member for a staircase with strength at a joint part without exposing a metal fitting for the staircase like a joint part between a bridgeboard and a structural member on a staircase.SOLUTION: A joint fitting 10 of a joint member for a staircase is configured to integrally form a body plate 11 and a side plate 12 having a lug part 12b extending upward from the body plate 11 erected from both of right and left ends of the plate body 11, wherein the joint fitting 10 of the joint members 10, 20 jointing two members 1, 2 to each other is attached to one member 1.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a connecting member for a staircase that attaches a rafter to an upper structural member. [Background technology]

[0002] Stairs used in homes can be broadly divided into box stairs and exposed stairs, depending on whether the underside of the stairs is exposed or not. In the case of exposed stairs, all of the staircase components are exposed, so the rafters also need to be aesthetically pleasing. In the case of exposed stairs, there are several methods for construction, but one example is to fix the upper end of the braided beam 1 to an upper structural member 2 such as a pillar or beam (Figure 7). In this example, a seat groove 1c is provided in the braided beam 1, and a coach bolt 4 is inserted into this seat groove 1c and fixed to the upper structural member 2.

[0003] The head of this coach bolt 4 is exposed from the front of the stairs, so it is necessary to cover it with a wooden plug or similar material of the same color as the stringer beam 1. Also, in the past, there was a time when coach bolt 4 was not used, and stringer beam 1 was simply fixed in place with nails or similar after being installed so that it rested on the beams and girders.

[0004] These methods are time-consuming to install and, above all, difficult to position, and especially when they were fixed using nails alone, the strength was extremely low, so in recent years, installation using coach bolts and various metal fittings has become the norm.

[0005] Therefore, the applicant developed metal fittings that make positioning and installation easier (see Patent Document 1). Also, other companies have developed installation methods for braided beams that use mortises and metal fittings (see Patent Documents 2 and 3). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 3460013 [Patent Document 2] Patent No. 5899481 [Patent Document 3] Patent Publication No. 2014-129704 Summary of the Invention [Problem to be solved by the invention]

[0007] However, conventional exposed stairs have the following problems. (1) The metal fittings are exposed and unsightly Even after installation, some of the metal fittings remain exposed on the surface of the wooden rafter. For example, the metal fittings shown in Patent Document 1 are designed to be inserted into slits cut into the rafter, but the slits run through the top and bottom of the rafter end, so the metal part of the metal fittings is visible at the back of the slits. Furthermore, the pin part, although only about 10 mm in diameter, has an exposed metal head that is different from the wood.

[0008] (2) The connection parts are weak In the event of a large external force, such as an earthquake, the bracing beams could come off the structural members above, causing the staircase itself to collapse. Nails are out of the question because they are not strong enough, and most metal fittings are limited to simple pin joints, which are not strong enough. Pins are often used because they are easy to install, but they also pose the risk of loosening due to shrinkage as the wood dries or cracking, which can cause a sudden loss of holding power. In all of the inventions described in Patent Documents 1 to 3, the joints using metal fittings cannot be said to be strong joints, and they merely achieve simple fixing and improved positioning accuracy.

[0009] (3) The wooden parts are easily scratched When using connecting fittings, the fittings are attached to the upper structural member and a slit or other receiving opening is provided on the rafter, but there have been cases where the fittings have come into contact with the wooden part around the receiving opening of the rafter and caused scratches.

[0010] Therefore, the object of the present invention is to provide a connecting member for stairs in which metal fittings are not exposed at the connecting portion of the stairs, such as the connecting portion between the braided beam and the upper floor structural member, and the connecting portion is strong. [Means for solving the problem]

[0011] In order to achieve the above object, the connecting member for stairs of the present invention is a connecting member for stairs (10, 20) for attaching two members (1, 2) to each other, The connecting member (10, 20) comprises a first connecting fitting (10) and a second connecting fitting (20), The second connector (20) is connected to one of the two members (1, 2). (2) Attached The first connecting fitting (10) is attached to the inner wall of the attachment groove (1b) provided in the other member (1), The second connector (20) has: Contact with the one member (2) second Main board (21) and second side plates (22) extending rearward from both left and right ends of the second main body plate (21) and facing each other are provided with second fitting portions (22) each having a guide groove (22a) opening upward, The aforementioned second Two V-shaped notches at separate positions on the main plate (21) but It is established, The first connecting fitting (10) is provided with a first main body plate (11) and first fitting portions (15) extending from both left and right ends of the first main body plate (11) toward the front and across to first side plates (12) facing each other, The first fitting portion (15) and the second fitting portion (22) are fitted together, and the first connecting fitting (10) and the second connecting fitting (20) are fitted together, and the first connecting fitting (10) and the second connecting fitting (20) are accommodated in the mounting groove (1b). It is characterized by:

[0012] Furthermore, the present invention is also directed to a method for manufacturing a semiconductor device, wherein the tips of the two V-shaped notches are second Connector (20) The second body plate (21) It is characterized by being provided on the center line.

[0013] The present invention also provides the above-mentioned second Between the two V-shaped notches of the connector (20), second The connector (20) is characterized by having a temporary fastening hole (21b) for attaching the connector (20) to the one member (2).

[0014] Here, the symbols in parentheses indicate corresponding elements or items shown in the drawings and in the detailed description to be described later. [Effects of the Invention]

[0015] According to the present invention, there is provided a connecting element for stairs for attaching two elements to each other, the connecting element being attached to one of the elements. The second connecting fitting and the first connecting fitting attached to the other member are fitted together via the second fitting portion and the first fitting portion, so the strength of the connection portion is high. In addition, the first connecting fitting is attached to the rear wall of an attachment groove provided in the other component, and the first connecting fitting and the second connecting fitting are housed within the attachment groove when fitted together, so the connecting fittings are not exposed, resulting in an aesthetically pleasing appearance. In addition, second The connector is in contact with one of the components. second A body plate is provided. second Two V-shaped notches are provided at separate positions on the top and bottom of the main body plate, allowing for Second for one member The mounting position of the connecting fittings can be adjusted. The tips of the two V-shaped notches are second Connection fittings The second body plate It is preferable to provide it on the center line.

[0016] Further, according to the present invention, second Between the two V-shaped notches on the fitting, second A temporary fixing hole is provided when attaching the connecting fitting to one of the components, second When the connecting fitting is temporarily attached to one of the members with a nail using the temporary fixing hole, the position can be adjusted using the two notches. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a first connecting fitting in a staircase mounting structure according to a first embodiment of the present invention; FIG. [Figure 2] FIG. 2 is a perspective view showing a second connecting fitting in the mounting structure for stairs according to the first embodiment of the present invention. [Figure 3] 1 is a side view showing the state before the first connecting fitting and the second connecting fitting are fitted together in the staircase mounting structure according to the first embodiment of the present invention. FIG. [Figure 4] 1 is a side view showing the state before the first connecting fitting and the second connecting fitting are fitted together in the staircase mounting structure according to the first embodiment of the present invention. FIG. [Figure 5] 1 is a side view showing the state before the first connecting fitting and the second connecting fitting are fitted together in the staircase mounting structure according to the first embodiment of the present invention. FIG. [Figure 6] 1 is a side view showing the state when the first connecting fitting and the second connecting fitting are fitted together in the staircase mounting structure according to the first embodiment of the present invention. FIG. [Figure 7] FIG. 10 is a side view showing a mounting structure for an exposed staircase according to a conventional example. [Figure 8] 10A and 10B are three-view diagrams showing a connecting fitting in a mounting structure for stairs according to a second embodiment of the present invention. [Figure 9] A side view showing the first connecting fitting and the second connecting fitting in the staircase mounting structure according to the second embodiment of the present invention until they are fitted together. [Figure 10] An oblique view showing the attachment state of the first connecting fitting to the rafter in the staircase attachment structure of the second embodiment of the present invention. [Figure 11] A three-view diagram showing the state when the first connecting fitting and the second connecting fitting are fitted together in the staircase mounting structure according to the second embodiment of the present invention. [Figure 12] 10A and 10B are side views showing variations of the ears of the first connecting fitting in a mounting structure for stairs according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] (First embodiment) 1 to 6, a mounting structure for stairs and connecting members 10, 20 for stairs according to a first embodiment of the present invention will be described. In this embodiment, the stairs are exposed stairs, and when viewed from the exposed stairs, the direction of the upper floor structural member 2 such as a beam is defined as the forward direction, and the thickness direction of the exposed stairs' girders 1 is defined as the left-right direction. The connecting members 10, 20 for exposed stairs are used to attach the exposed stairs to the upper structural member 2, and comprise a first connecting fitting 10 and a second connecting fitting 20.

[0019] The first connecting piece 10 is a metal member that includes a first main body plate 11 , two first side plates 12 , a first upper plate 13 , and a locking portion 15 . The first body plate 11 extends vertically and has two mounting holes (not shown) formed vertically. The first connector 10 is attached to the back wall of the mounting groove 1b of the crossbeam 1 through these mounting holes. There are two first side plates 12, which face each other and stand forward from both left and right ends of the first main body plate 11. Support holes 12a are formed in the first side plates 12 at opposing positions.

[0020] The first upper plate 13 stands forward from the upper end of the first main body plate 11. The lower surface of the first upper plate 13 is spaced apart from the upper end of the first side plate 12. A hole is formed in approximately the center of the first upper plate 13. The first main body plate 11, the two first side plates 12, and the first upper plate 13 are integrally formed by pressing a single metal plate member, and each has a thickness of 2.3 mm.

[0021] The locking portion 15 is a rod-shaped member whose diameter is less than but approximately equal to the diameter of the support hole 12a of the first side plate 12. The locking portion 15 is inserted through the support hole 12a of the first side plate 12 so as to extend in the left-right direction, and is supported by the two support holes 12a so as to bridge over them. At this time, the locking portion 15 is simply passed through the support holes 12a, and the locking portion 15 and the first side plate 12 are not fixed to each other. In addition, the length of the locking portion 15 is approximately equal to the distance between the outer surfaces of the first side plate 12, and when the locking portion 15 is inserted into the two support holes 12a, the locking portion 15 does not protrude from the outer surface of the first side plate 12, and the tip of the locking portion 15 is flush with the outer surface of the first side plate 12.

[0022] The second connecting piece 20 is a metal member comprising a second main body plate 21, two second side plates 22, and a second upper plate 23. The second body plate 21 extends vertically and has two mounting holes formed vertically. The second connector fitting 20 is attached to the upper structural member 2 via these mounting holes.

[0023] There are two second side plates 22, which stand rearward from both left and right ends of the second main body plate 21 and face each other. The second side plate 22 constitutes a receiving hook in which a guide groove 22a is formed in a substantially U-shape so as to open upward, and the second side plate 22 itself has a substantially J-shape. The guide groove 22a of the receiving hook is formed so that its lower portion slopes slightly forward as it goes from top to bottom. In other words, the front wall of the guide groove 22a is slightly recessed forward, and the rear wall of the guide groove 22a is slightly curved forward. The distance between the outer surfaces of the second side plates 22 is shorter than the distance between the inner surfaces of the first side plates 12 .

[0024] The second upper plate 23 stands rearward from the upper end of the second main body plate 21 , and the lower surface of the second upper plate 23 is spaced apart from the upper end of the second side plate 22 . The second main body plate 21, the two second side plates 22, and the second upper plate 23 are integrally formed from a single metal plate member by press working, and each plate has a thickness of 2.3 mm. A female screw 23a is formed in the approximate center of the second upper plate 23. That is, a hole is formed in the approximate center of the second upper plate 23, and the hole is tapped. The position of this female screw 23a is a portion of the second upper plate 23 that is directly below the hole 13a of the first upper plate 13 when the first connecting piece 10 and the second connecting piece 20 are fitted together.

[0025] An installation structure for exposed stairs using the thus configured connecting members 10, 20 for exposed stairs will be described. The rafters 1 are placed on both the left and right sides of the exposed stairs. Here, we will explain one of the left and right sides. As shown by the dashed line in Figure 1, a mounting groove 1b that opens upward and forward is formed at the upper connection end 1a of the braced beam 1. On the other hand, the connection end 1a does not open downward. The shape of the mounting groove 1b itself is a rectangular parallelepiped.

[0026] The first connecting fitting 10 is attached so that it does not protrude (expose) from such an attachment groove 1b. Specifically, when the first main body plate 11 is attached to the bolts on the rear wall of the attachment groove 1b, the front end of the first side plate 12 is flush with the front end of the connecting end 1a of the stringer 1. Also, the first upper plate 13 is positioned downward so that the head of the bolt B that connects the first connecting fitting 10 and the second connecting fitting 20 is not exposed from the upper end of the connecting end 1a of the stringer 1.

[0027] Meanwhile, the second main body plate 21 is attached to the upper structural member 2 by bolts.

[0028] To mate the first connecting fitting 10 with the second connecting fitting 20, first, bring the first connecting fitting 10 close to the second connecting fitting 20 as shown in Figure 3. Note that although the crossbeam 1 and upper structural member 2 are omitted from Figures 3 to 5, it is assumed that the first connecting fitting 10 and the second connecting fitting 20 are attached, respectively, as described above.

[0029] Next, as shown in Figure 4, tilt the first connecting fitting 10 forward and move it closer to the second connecting fitting 20 so that the second connecting fitting 20 fits between the first side plates 12, and then move the first connecting fitting 10 forward until the engaging portion 15 is positioned approximately above the guide groove 22a of the receiving hook 22, as shown in Figure 5.

[0030] 6, the locking portion 15 is dropped into the guide groove 22a of the receiving hook 22 to be fitted in. At this time, the locking portion 15 becomes a convex portion and the guide groove 22a becomes a concave portion, so that they can be fitted together. Next, bolt B is threaded into female thread 23a of second upper plate 23 through hole 13a of first upper plate 13. When threaded in this manner, locking portion 15 is pressed against guide groove 22a.

[0031] At this time, as shown in Figure 6, the second connecting fitting 20 is housed within the first connecting fitting 10. Here, the first connecting fitting 10 is housed within the mounting groove 1b of the reed beam 1 as shown in Figure 1, so when the first connecting fitting 10 and the second connecting fitting 20 are fitted together, the front surface of the connecting end 1a of the reed beam 1 abuts against the upper structural member 2. Furthermore, when the plates are fitted together, the first upper plate 13 and the second upper plate 23 are spaced apart from each other. Finally, the tread 3 is detachably attached to the upper surface of the connecting end 1a of the brazier 1.

[0032] According to the staircase mounting structure and staircase connecting members 10, 20 configured as described above, when the first fitting portion 15 and the second fitting portion 22 are fitted together, the second connecting fitting 20 is also accommodated in the mounting groove 1b, so that the first connecting fitting 10 and the second connecting fitting 20 are not exposed, resulting in an aesthetically pleasing appearance. In particular, when the tread 3 is attached to the top surface of the connecting end 1a of the slat 1, the first connecting fitting 10 and the second connecting fitting 20 are completely invisible from the outside. Moreover, they can be concealed by the tread 3, which is a necessary component for the stairs, so there is no need to use a new component for concealment.

[0033] In addition, the first connecting fitting 10 attached to the crossbeam 1 and the second connecting fitting 20 attached to the upper floor structural member 2 are fitted together, so the strength of the connection portion is high. Furthermore, the first connecting fitting 10 is not exposed, and the second connecting fitting 20 is exposed before assembly but is joined toward the end face of the rafter which is hidden after completion, so that the wooden parts that are visible after completion of the rafter 1 and upper structural member 2 are less likely to be damaged.

[0034] Furthermore, the first connecting fitting 10 has a locking portion 15 extending in the left-right direction, and the second connecting fitting 20 has a receiving hook 22 with a roughly U-shaped guide groove 22a formed therein so that it opens upward, and the weight of the exposed stair causes the locking portion 15 to fall into the guide groove 22a of the receiving hook, resulting in an engaged state, so the connection method is simple and the connection portion is sufficiently strong. In addition, the guide groove 22a of the receiving hook 22 is formed so that it moves forward as it goes from top to bottom, so that when engaged, the locking portion 15 slides against the rear wall of the guide groove 22a and is guided, and the slat 1 is pulled toward the upper structural member 2 by its own weight.

[0035] Furthermore, when fitting, a bolt B is threaded from above through the hole 13a of the first upper plate 13 into the female screw 23a of the second upper plate 23, thereby providing a stronger connection. It can be prevented from coming off even if a force is applied from below due to an earthquake or the like. Furthermore, since the first upper plate 13 and the second upper plate 23 are spaced apart, when the bolt B is screwed in, the first upper plate 13 bends and tension remains applied due to its elasticity, preventing the bolt B from loosening.

[0036] Moreover, since the tread 3 is detachably attached to the top surface of the connecting end 1a of the rafter 1, even if the bolt B loosens or the structural members on the upper floor dry and shrink after construction, the bolt B can be retightened by removing the tread 3. As a result, rattling of the exposed staircase itself is prevented.

[0037] Furthermore, since both the first connecting fitting 10 and the second connecting fitting 20 are integrally formed by press working, the strength of the fittings themselves is high, manufacturing costs are low, and defects are less likely to occur during manufacturing.

[0038] Furthermore, the first connecting fitting 10 and the second connecting fitting 20 themselves can be easily attached. Furthermore, once the mounting position of the second connecting fitting 20 is determined, the first connecting fitting 10 simply fits into it, making it easy to adjust the overall position.

[0039] Second Embodiment A mounting structure for stairs and connecting members 10, 20 for stairs according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the direction of the upper structural member 2 such as a beam when viewed from the exposed staircase is defined as the forward direction, and the thickness direction of the braided beam 1 of the exposed staircase is defined as the left-right direction. The connecting members 10, 20 for exposed stairs are used to attach the exposed stairs to the upper structural member 2, and comprise a first connecting fitting 10 and a second connecting fitting 20.

[0040] The first connecting piece 10 is a metal member that includes a first main body plate 11 , two first side plates 12 , a first upper plate 13 , and a locking portion 15 . The first main body plate 11 extends vertically and has two mounting holes 11a (diameter 12 mm) and one temporary fixing hole 11b (diameter 6 mm) formed vertically. The lower mounting hole 11a is located lower and further away from the support hole 12a. The first connecting fitting 10 is attached to the back wall of the mounting groove 1b of the crossbeam 1 with a coach bolt via this mounting hole 11a. The first upper plate 13 stands forward from the upper end of the first main body plate 11. The first upper plate 13 has a long hole 13a (9 mm in diameter and 12 mm in length) formed in the approximate center thereof. There are two first side plates 12, each standing forward from the left and right ends of the first main body plate 11 and facing each other, with their upper ends having ears 12b that extend above the position of the first upper plate 13. The height of the ears 12b is 10 mm from the lower end surface of the first upper plate 13. Furthermore, support holes 12a with diameters of approximately 9.1 mm and 9 mm are formed at opposing positions on the first side plate 12, respectively.

[0041] The first main body plate 11, the two first side plates 12, and the first upper plate 13 are formed integrally from a single metal plate punched into plate-like members by pressing and bending the same. Each plate has a thickness of 2.3 mm. The locking portion 15 is a rod-shaped member with a diameter approximately equal to the diameter of the support hole 12a of the first side plate 12. In this example, it is a round rod with a diameter of approximately 9 mm. The locking portion 15 is inserted through the support holes 12a of the first side plate 12 so as to extend in the left-right direction, and is supported by the two support holes 12a so as to bridge over them. At this time, the locking portion 15 is passed through the support holes 12a, and one side is press-fitted and fixed. Furthermore, the length of the locking portion 15 is approximately equal to the distance between the outer surfaces of the first side plate 12 (41 mm), and when the locking portion 15 is inserted into the two support holes 12a, the locking portion 15 does not protrude from the outer surface of the first side plate 12, and the tip of the locking portion 15 is flush with or slightly recessed from the outer surface of the first side plate 12. When not fixed, both support holes are 9.1 mm, and to prevent falling off, the length of the locking portion 15 is made at least longer than the distance between the two first side plates 12 plus the thickness of one plate (38.7 mm).

[0042] The second connecting piece 20 is a metal member comprising a second main body plate 21, two second side plates 22, and a second upper plate 23. The second main body plate 21 extends vertically and has two mounting holes 21a (12 mm in diameter) and one temporary fixing hole 21b (6 mm in diameter) formed vertically. The upper mounting hole 21a is located higher and further away from the lower part 22b of the guide groove 22a. The second connecting fitting 20 is attached to the upper structural member 2 with a coach bolt via this mounting hole 21a. In addition, to indicate its center, a V-shaped notch is provided at the lower end of the second main body plate 21 and in the upper mounting hole 21a.

[0043] There are two second side plates 22, which stand rearward from both left and right ends of the second main body plate 21 and face each other. The second side plate 22 constitutes a receiving hook in which a guide groove 22a is formed in a substantially U-shape so as to open upward, and the second side plate 22 itself has a substantially J-shape. Furthermore, the lower portion 22b of the guide groove 22a of the receiving hook has a diameter larger than the diameter (9 mm) of the locking portion 15, and is shaped as part of an ellipse that is slightly longer in the front-to-back direction, consisting of an arc and a line segment, with the front portion 22c of the guide groove being formed so that it angles slightly forward as it goes from top to bottom, and the rear end 22d of the guide groove is also formed so that it angles forward as it goes from top to bottom. This shape makes it easy to insert the locking portion 15 when joining metal fittings together. The oval portion of the lower part 22b of the guide groove of the receiving hook consists of an arc with a radius of 6 mm, a linear flat part with a radius of 2 mm, and another arc with a radius of 6 mm. When installing the stairs, after the locking part 15 is received by the receiving hook, when adjusting the position of the brazier 1 in the fore-and-aft direction, if the locking part 15 is near the flat part, it can easily move horizontally. In other words, outside of that range, it must move not only horizontally but also vertically along the arc. The surface of the lower part of the guide groove of the receiving hook may be roughened or treated with a certain degree of unevenness to prevent misalignment with the locking part 15 after installation. The distance between the outer surfaces of the second side plates 22 is shorter than the distance between the inner surfaces of the first side plates 12 .

[0044] The second upper plate 23 stands rearward from the upper end of the second main body plate 21 , and the lower surface of the second upper plate 23 is spaced apart from the upper end of the second side plate 22 . The second main body plate 21, the two second side plates 22, and the second upper plate 23 are integrally formed by pressing plate-like members, and also have a thickness of 2.3 mm. A female screw 23a is formed in the approximate center of the second upper plate 23. That is, a hole is formed in the approximate center of the second upper plate 23, and a tap (M8 tap) is cut into the hole. The position of this female screw 23a is in a portion of the second upper plate 23 that is directly below the center of the elongated hole 13a of the first upper plate 13 when the first connecting piece 10 and the second connecting piece 20 are fitted together.

[0045] An installation structure for exposed stairs using the thus configured connecting members 10, 20 for exposed stairs will be described. The rafters 1 are placed on both the left and right sides of an exposed staircase. Alternatively, one side may have a rafter 1 and the other side may have a wall or side panel supporting the treads of the exposed staircase. Here, we will explain one rafter. As shown in Figure 9(e), a mounting groove 1b that opens upward and forward is formed at the upper connection end 1a of the braced beam 1. On the other hand, the mounting groove 1b does not open downward. The mounting groove 1b itself is a U-shaped groove.

[0046] The rearward depth of the mounting groove 1b is drilled to a dimension that prevents the first side plate 12 of the first connecting fitting 10 from protruding (exposing) from the crossbeam 1, and the first connecting fitting 10 is attached therein. The downward length of the mounting groove 1b is long enough that, when the fittings are attached by fitting together, the tip of the J-shape of the second connecting fitting 20 is below the locking portion 15 of the first connecting fitting, and the second connecting fitting 20 enters the mounting groove 1b. In detail, when the first main body plate 11 is attached to the rear wall of the mounting groove 1b with a coach bolt, the front end of the first side plate 12 is flush with or slightly recessed from the front end of the connection end 1a of the stringer 1, as shown in Figure 10, and the first connecting fitting 10 is positioned so that the upper end of the ear 12b of the first connecting fitting 10 is flush with or slightly recessed from the upper end of the connection end 1a of the stringer 1.

[0047] Meanwhile, the second connecting fitting 20 is temporarily attached with nails using temporary fastening holes 21b after the top surface of the second upper plate 23 is aligned horizontally at a position a predetermined distance (10 mm in this example) below the position of the top surface of the stringer 1 at the position where it should be installed, and the center line where the stringer 1 should be attached is aligned with the tips of the two V-shaped notches in the second main body plate 21 of the second connecting fitting 20. After that, it is attached to the upper floor structural member 2 with coach bolts using the mounting holes 21a in the second main body plate 21. The above is the case when the center of the first connecting fitting is installed in the center of the left and right (thickness) of the stringer; if that position is different, the mounting position of the second connecting fitting is adjusted appropriately.

[0048] The first connecting piece 10 is mated with the second connecting piece 20 as shown in Figures 9(a) to 9(d).

[0049] As shown in Figure 9(a), the first connecting fitting 10 is brought closer to the second connecting fitting 20 from above so that the second connecting fitting 20 fits between the first side plates 12 of the first connecting fitting 10, and the first connecting fitting 10 is lowered until the engaging portion 15 is positioned approximately above the guide groove 22a of the receiving hook 22, as shown in Figure 9(b).

[0050] Then, as shown in FIGS. 9(c) and 9(d), the locking portion 15 is dropped into the guide groove 22a of the receiving hook 22 and fitted. Next, the truss beam 1 is advanced so that the front surface of the truss beam 1 is in close contact with the upper floor structural member 2, and the bolt is screwed into the female thread 23a of the second upper plate 23 through the long hole 13a of the first upper plate 13.

[0051] At this time, as shown in Figure 11, the second connecting fitting 20 is housed within the first connecting fitting 10. Here, the first connecting fitting 10 is housed within the mounting groove 1b of the reed beam 1, and when the first connecting fitting 10 and the second connecting fitting 20 are fitted together, the front surface of the connecting end 1a of the reed beam 1 is in approximate contact with the upper structural member 2. Furthermore, the head of the bolt (not shown) is shorter than the length of the ear portion 12b and is therefore housed inside the mounting groove 1b. Finally, the tread is removably attached to the top surface of the connecting end 1a of the rafter 1 with wood screws. Furthermore, a removable cover may be placed over the head of the wood screw to hide it by embedding it in the tread. By making the bolt longer than a predetermined length, even if the bolt loosens, the head of the bolt will hit the underside of the tread, preventing it from falling off. This predetermined length is the distance from the top end of the second top plate 23 to the top end of the first side plate 12 (top end of the ear 12b), which is 10 mm in this example. The upper part of the reed beam 1 is fixed with connecting fittings 10, 20, and then the lower part is fixed to a predetermined member such as a structural member of the floor.

[0052] The staircase mounting structure and staircase connecting member configured as described above not only achieves the effects of the first embodiment, but also makes it easy to determine the mounting position of the first connecting fitting 10 in the mounting groove 1b of the braced beam 1. It also makes it easy to determine the mounting position of the second connecting fitting 20 in the upper structural member 2.

[0053] Furthermore, since the mounting holes 11a, 21a of the connecting fittings 10, 20 are located away from the support hole 12a and the lower part of the guide groove 22b, where force is applied, the force that pulls the connecting fittings 10, 20 away from the brace 1 and the upper structural member 2 (the pulling force applied to the coach bolt) can be reduced. Furthermore, if a bolt that is sufficiently longer than the height of the ear 12b is used, even if the bolt becomes extremely loose, as long as the footplate 3 is attached, the bolt head will be held down by the footplate 3 and the bolt itself will not come off, making it safe.

[0054] Compared to the conventional method of directly attaching the braided beam 1 itself to the structural material with coach bolts, the mounting structure of the present application, in which only the connecting fittings 10, 20 are attached to the structural material in advance, has the advantage of being easy to install and, combined with the ability to temporarily fasten the connecting fittings 10, 20, it is also easy to position. When connecting the rafter 1 and the upper floor structural member 2, it is only necessary to drop it into the metal fittings, so there is no need to hammer the rafter 1, or to apply force such as to screw in a coach bolt, and since there is no possibility of tools coming into contact, there is no need to damage visible parts after installation or prepare extra parts to conceal them. When installing rafters for stairs that are designed to be visible after completion, it is desirable to do so in a way that does not damage the parts that are visible from the time of construction. For example, when connecting structural components that are hidden in the wall, strong connections are achieved by designing the joints and metal fittings tight and then hammering them in. However, with the configuration of this application, there is no need to hammer in or do anything that could cause damage when connecting, and bolts are tightened at the end of construction to create a tight, strong connection. Furthermore, if the surface of the beam to which the girders are connected is tilted away from the vertical, and the connection is designed to be tight, it may not fit even when hammered. Furthermore, coupled with the length of the girders, issues such as dimensional misalignment at the other end arise, but the connecting fittings of the second embodiment of this application have ample space in the guide groove, which has the advantage of being able to absorb the effects of the tilt of the beam. Furthermore, unlike tightly designed and hammered joints, the metal fittings used in this invention make it easy to remove the rafters, making it effective for renovations and maintenance. After the stairs are installed, if noises such as footsteps occur and maintenance is required, this can be easily addressed by removing the tread 3 attached to the top of the connecting fittings 10, 20, adjusting the position of the crossbeam 1, for example, and tightening the bolts of the connecting fittings 10, 20.

[0055] In the above two embodiments, the locking portion 15 of the first connecting fitting 10 is a convex fitting portion and the guide groove 22a of the receiving hook 22 of the second connecting fitting 20 is a concave fitting portion, but this is not limited to this. In other words, any shape is acceptable as long as the convex and concave shapes fit together, and the first connecting fitting 10 side may be concave and the second connecting fitting 20 side may be convex.

[0056] Furthermore, although the guide groove 22a of the receiving hook is directed forward from the top to the bottom, it is not limited to this and may simply be directed straight down. Furthermore, the arc shape of the lower portion of the guide groove of the receiving hook of the second connecting fitting 20 may be a similar curve. Furthermore, although the second upper plate 23 of the second connecting fitting 20 is tapped, it is sufficient that a female thread 23a is formed, and for example, a nut may be welded.

[0057] Furthermore, although the thickness of the first connecting fitting 10 and the second connecting fitting 20 is set to 2.3 mm, this is merely a range of 2 to 3.5 mm being preferable, and is not limited to this. It can be changed as appropriate depending on the material and the required strength.

[0058] Furthermore, shape changes, such as to make it easier to guide the first fitting portion 15 of the first connecting fitting 10 into the guide groove 22a of the second connecting fitting 20, can be made as appropriate within the scope that does not change the gist of the present invention. Furthermore, although the first upper plate 13 and the second upper plate 23 are spaced apart from each other, the present invention is not limited to this.

[0059] The bending may be performed by a normal bending method for sheet metal other than pressing. Here, the term "slat beam 1" is used to refer to something that supports the stair treads, but side panels that have grooves cut into them into which treads can be inserted can also be connected at the top to the beam using the connecting fittings in question, and such side panels are also referred to as "slat beam 1." Furthermore, the shape of the ear portion 12b can be various shapes as shown in Figure 12, and is not limited to these as long as its upper end is a shape that allows it to be aligned when attached along the upper end of the brazier 1. The above describes attaching the girders to upper-floor structural materials such as beams, but this also includes cases where the surface of the beams, etc. is finished with surface finishing materials such as gypsum board, plywood, or even wallpaper, and then the girders are attached by attaching the second connecting fitting 20 to the beam portion. [Explanation of symbols]

[0060] 1. Slats 1a Connection end 1b Mounting groove 1c Seat carving Structural members above the second floor 3 Treadboard 4 Coach Bolt 10 First connecting fitting (connecting member) 11 First body plate 11a Mounting hole 11b Temporary fixing hole 12 First side plate 12a Support hole 12b Ears 13 First Upper Plate 13a hole 15 Locking portion (first fitting portion) 20 Second connecting fitting (connecting member) 21 Second body plate 21a Mounting hole 21b Temporary fixing hole 22 Second side plate (receiving hook, second fitting portion) 22a Guide groove 22b lower part 22c front 22d rear end 23 Second Upper Plate 23a female thread B Bolt

Claims

1. A connecting member for a staircase for attaching two members to each other, comprising: The connecting member includes a first connecting fitting and a second connecting fitting, The second connecting fitting is attached to one of the two members, and the first connecting fitting is attached to a back wall of a mounting groove provided in the other member, The second connecting fitting is provided with a second body plate that contacts the one of the members, and a second fitting portion having a guide groove that opens upwardly on the second side plates that face each other and are erected rearward from both the left and right ends of the second body plate, and V-shaped notches are provided in two locations spaced apart vertically on the second body plate, The first connecting fitting is provided with a first body plate and first fitting portions extending forward from both left and right ends of the first body plate and across first side plates facing each other, A connecting member for stairs, characterized in that the first engaging portion and the second engaging portion engage with each other, so that the first connecting fitting and the second connecting fitting are in an engaged state, and the first connecting fitting and the second connecting fitting are accommodated in the mounting groove.

2. A connecting member for stairs as described in claim 1, characterized in that the tips of the two V-shaped notches are arranged on the center line of the second main plate of the second connecting fitting.

3. A connecting member for stairs as described in claim 1 or 2, characterized in that a temporary fastening hole is provided between the two V-shaped notches of the second connecting fitting for attaching the second connecting fitting to the one of the components.

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