Staircase connection parts

Abstract

To provide a connection member for stairs that does not expose metal fittings at connection parts of the stairs, such as a connection part between a bridgeboard girder and an above-story structural member, and is strong at the connection part.SOLUTION: There are provided connection members 10, 20 for stairs for joining two members 1, 2. The connection members 10, 20 are each composed of a first connection metal fitting 10, a second connection metal fitting 20 and a connection bolt B. The first connection metal fitting 10 is provided with a first upper plate 13 having a hole 13a for passing the connection bolt B and a first engaging portion 15. The second connection metal fitting 20 is provided with a second upper plate 23 having a hole 23a to be screwed with the connection bolt B and a second engaging portion 22 having a guide groove 22a opening at the top. And the first engaging portion 15 falls into the second engaging portion 22 to make the first connection metal fitting 10 and second connection metal fitting 20 fit together, and the first upper plate 13 and the second upper plate 23 are connected through the hole 13a of the first upper plate 13 with the connection bolt B.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] Stairs used in homes are 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 the components of the stairs are exposed, so the rafters also need to be stylish. There are several methods for constructing exposed stairs, but one example is to fix the upper end of the rafter 1 to the upper floor structural member 2 such as a pillar or beam (Figure 7). In this example, a seat groove 1c is provided on the rafter 1, and a coach bolt 4 is inserted into this seat groove 1c to fix it to the upper floor structural member 2.

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

[0004] These methods are time-consuming to install and, above all, difficult to position; 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 mainstream.

[0005] Therefore, the applicant developed a metal fitting that makes positioning and installation easier (see Patent Document 1). Also, other companies have developed installation methods for slat 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, the conventional exposed stairs have the following problems. (1) The metal fittings are exposed and unsightly Even after installation, parts of the metal fittings are exposed on the surface of the wooden beam. For example, the metal fittings shown in Patent Document 1 are designed to be inserted into slits cut into the beam, but the slits run through the top and bottom of the beam end, so the metal parts of the fittings are visible at the back of the slits. Furthermore, the pin part has a diameter of about 10 mm, but the metal head, which is different from the wood, is exposed.

[0008] (2) The connection parts are weak In the event of a large external force being applied, such as an earthquake, there was a risk that the rafters would come off the structural components on the upper floors and the staircase itself would collapse. Nails are out of the question because of their low strength, and even metal fittings are often limited to simple pin joints, which are not strong enough. Pins are often used because they are easy to install, but they can shrink as the wood dries or crack, causing loosening and 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 receiving hole such as a slit is provided on the truss side, but there have been cases where the fittings come into contact with the wooden part around the receiving hole of the truss and cause scratches.

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

[0011] In order to achieve the above object, the present invention provides a connecting member for stairs (10, 20) for attaching two members (1, 2) to each other, comprising: The connecting member (10, 20) comprises a first connecting fitting (10), a second connecting fitting (20) and a connecting bolt (B), The first connecting fitting (10) has: a first body plate (11), and a A first upper plate (13) having a hole (13a) through which the connecting bolt (B) passes; The first body plate (11) is provided with first side plates (12) extending forward from both the left and right ends thereof. A first engaging portion (15) is provided, The second connecting fitting (20) has a second body plate (21), and a second body plate (22) extending from an upper end of the second body plate (21) toward the rear; a second upper plate (23) having a hole (23a) into which the connecting bolt (B) is screwed; The second body plate (21) has second side plates (22) which are erected rearward from both the left and right ends and face each other. A second engaging portion (22) is provided in which a guide groove (22a) that opens upward is formed, The first engaging portion (15) falls into the second engaging portion (22), and the first connecting fitting (10) and the second connecting fitting (20) are brought into an engaged state, The first connecting fitting (10) and the second connecting fitting (20) are received in a mounting groove (1b) of one member (1) of the two members (1, 2), The first upper plate (13) and the second upper plate (23) are connected to each other by the connecting bolt (B) through a hole (13a) in the first upper plate (13).

[0012] Here, the symbols in parentheses indicate corresponding elements or items shown in the drawings and in the detailed description below. Effect of the Invention

[0013] According to the present invention, there is provided a connecting member for a staircase for attaching two members to each other, the connecting member comprising a first connecting fitting, a second connecting fitting and a connecting bolt, the first connecting fitting having: A first body plate;A first upper plate having a hole through which the connecting bolt passes and a first locking portion are provided, and the second connecting fitting is provided with a second main body plate, a second upper plate having a hole into which the connecting bolt screws, and a second locking portion having a guide groove that opens upward, and when the first locking portion drops into the second locking portion, the first connecting fitting and the second connecting fitting are fitted together, The first connector and the second connector are received in a mounting groove of one of the two members; The first and second upper plates are connected by connecting bolts through the holes in the first upper plate. The metal fittings are not exposed at the connection points of the stairs. The first connecting fitting and the second connecting fitting are firmly connected to each other. This can prevent the bracket from coming off even if a force pushing it up from below is applied due to an earthquake or the like. [Brief description of the drawings]

[0014] [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. [Diagram 2] 1 is a perspective view showing a second connecting fitting in a staircase mounting structure according to a first embodiment of the present invention; FIG. [Diagram 3] A side view showing the state before the first connecting fitting and the second connecting fitting are engaged in the staircase mounting structure according to the first embodiment of the present invention. [Figure 4] A side view showing the state before the first connecting fitting and the second connecting fitting are engaged in the staircase mounting structure according to the first embodiment of the present invention. [Diagram 5] A side view showing the state before the first connecting fitting and the second connecting fitting are engaged in the staircase mounting structure according to the first embodiment of the present invention. [Figure 6] A side view showing the state when the first connecting fitting and the second connecting fitting are engaged in the staircase mounting structure according to the first embodiment of the present invention. [Figure 7] FIG. 11 is a side view showing a mounting structure for an exposed staircase according to a conventional example. [Figure 8] 11A to 11C are three-sided views 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 state up to when the first connecting fitting and the second connecting fitting are engaged in a staircase mounting structure according to the second embodiment of the present invention. [Figure 10] An oblique view showing the attachment state of a first connecting fitting to a rafter in a staircase mounting structure relating to a second embodiment of the present invention. [Figure 11] A three-sided view showing the state when the first connecting fitting and the second connecting fitting are engaged in the staircase mounting structure relating to the second embodiment of the present invention. [Figure 12] 13A to 13C are side views showing variations of the ears of the first connecting fitting in a staircase mounting structure according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 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 slat 1 of the exposed stairs is defined as the left-right direction. This connecting member 10, 20 for the exposed staircase is used to attach the exposed staircase to the upper structural member 2, and comprises a first connecting fitting 10 and a second connecting fitting 20.

[0016] The first connecting fitting 10 is a metal member including 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 beam 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. Further, the first side plates 12 are each formed with a support hole 12a at a position facing each other.

[0017] 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. In addition, 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 have a thickness of 2.3 mm.

[0018] The locking portion 15 is a rod-shaped member whose diameter is less than and 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 in a bridging manner. 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.

[0019] The second connecting fitting 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 20 is attached to the upper structural member 2 through these mounting holes.

[0020] There are two second side plates 22, each standing rearward from both the left and right ends of the second main body plate 21 and facing each other. The second side plate 22 constitutes a receiving hook in which a substantially U-shaped guide groove 22a is formed so as to open upward, and the second side plate 22 itself has a substantially J-shape. In addition, the guide groove 22a of the receiving hook is formed so as to be slightly forward as it goes from top to bottom at its lower part. In other words, the front wall of the guide groove 22a is slightly recessed toward the front, and the rear wall of the guide groove 22a is slightly curved toward the front. The distance between the outer surfaces of the second side plates 22 is less than the distance between the inner surfaces of the first side plates 12 .

[0021] 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 pressing. The thickness of each of these members is also 2.3 mm. A female screw 23a is formed in approximately the center of the second upper plate 23. That is, a hole is formed in approximately the center of the second upper plate 23 and is tapped in the hole. 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 fitting 10 and the second connecting fitting 20 are fitted together.

[0022] The mounting structure for exposed stairs using the thus constructed connecting members 10, 20 for exposed stairs will be described below. The sash beams 1 are placed on 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 in the upper connection end 1a of the slat 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.

[0023] The first connecting fitting 10 is attached so that the first connecting fitting 10 does not protrude (expose) from such an attachment groove 1b. Specifically, when the first body plate 11 is attached to the bolts on the rear wall of the mounting groove 1b, the front end of the first side plate 12 is flush with the front end of the connection end 1a of the stringer 1. Also, the first upper plate 13 is disposed downward so that the head of the bolt B connecting the first connecting fitting 10 and the second connecting fitting 20 is not exposed from the upper end of the connection end 1a of the stringer 1.

[0024] Meanwhile, the second main body plate 21 is attached to the upper structural member 2 by bolts.

[0025] In order to fit the first connecting fitting 10 with the second connecting fitting 20, first, the first connecting fitting 10 is brought close to the second connecting fitting 20 as shown in Fig. 3. Note that although the slat 1 and upper floor structural member 2 are omitted in Figs. 3 to 5, it is assumed that the first connecting fitting 10 and the second connecting fitting 20 are respectively attached as described above.

[0026] 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 advance the first connecting fitting 10 until the engaging portion 15 is positioned approximately above the guide groove 22a of the receiving hook 22, as shown in Figure 5.

[0027] 6, the locking portion 15 is dropped into and fitted into the guide groove 22a of the receiving hook 22. 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, the bolt B is screwed into the female thread 23a of the second upper plate 23 through the hole 13a of the first upper plate 13. When screwed in this manner, the locking portion 15 is pressed against the guide groove 22a.

[0028] At this time, as shown in Fig. 6, the second connecting fitting 20 is housed within the first connecting fitting 10. Here, since the first connecting fitting 10 is housed within the mounting groove 1b of the stringer 1 as shown in Fig. 1, when the first connecting fitting 10 and the second connecting fitting 20 are fitted together, the front surface of the connection end 1a of the stringer 1 is in contact with the upper structural member 2. During this fitting process, the first upper plate 13 and the second upper plate 23 are spaced apart from each other. Finally, the step 3 is removably attached to the upper surface of the connection end 1a of the slat 1.

[0029] 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 engaged, 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 step 3 is attached to the top surface of the connection 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 step 3, which is a necessary component for the stairs, so there is no need to use a new component for concealment.

[0030] In addition, since the first connecting fitting 10 attached to the slat 1 and the second connecting fitting 20 attached to the upper floor structural member 2 fit together, the strength of the connection portion is high. In addition, 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 beam which is hidden after completion, so that the wooden parts visible after completion of the beam 1 and upper structural member 2 are less likely to be damaged.

[0031] 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 locking portion 15 falls into the guide groove 22a of the receiving hook due to the weight of the exposed step, thereby achieving an engaged state, making the connection method simple and providing sufficient strength to the connection portion. In addition, the guide groove 22a of the receiving hook 22 is formed so as to move forward as it goes from top to bottom, so that when the engaging portion 15 slides against the rear wall of the guide groove 22a during engagement, the girder 1 is pulled toward the upper structural member 2 by its own weight.

[0032] Furthermore, when the plates are fitted together, a bolt B is screwed 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 from each other, when the bolt B is screwed in, the first upper plate 13 bends and tension is maintained due to its elasticity, preventing the bolt B from loosening.

[0033] Moreover, since the tread 3 is detachably attached to the upper surface of the connecting end 1a of the slat 1, even if the bolt B loosens or the upper floor structural members dry and shrink after construction, the bolt B can be retightened by removing the tread 3. As a result, the exposed staircase itself is prevented from rattling.

[0034] Furthermore, since both the first connecting fitting 10 and the second connecting fitting 20 are integrally formed by pressing, the strength of the fittings themselves is high, manufacturing costs are low, and defects during manufacturing are unlikely to occur.

[0035] In addition, 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 has been determined, the first connecting fitting 10 can simply be fitted into it, making overall position adjustments easy.

[0036] 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 is defined as the forward direction when viewed from the exposed staircase, and the thickness direction of the slat 1 of the exposed staircase is defined as the left-right direction. This connecting member 10, 20 for the exposed staircase is used to attach the exposed staircase to the upper structural member 2, and comprises a first connecting fitting 10 and a second connecting fitting 20.

[0037] The first connecting fitting 10 is a metal member including 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 11a (diameter 12 mm) and one temporary fixing hole 11b (diameter 6 mm) formed vertically. The lower mounting hole 11a is provided at a lower position and away from the support hole 12a. The first connecting fitting 10 is attached to the back wall of the mounting groove 1b of the slat 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 approximately the center thereof. There are two first side plates 12, each standing forward from both 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 approximately 9 mm are formed at opposing positions on the first side plate 12, respectively.

[0038] 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 bending them by press working. The thickness of these plates is 2.3 mm. The locking portion 15 is a rod-shaped member whose diameter is 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. Then, it 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. 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 (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 into 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 engagement 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).

[0039] The second connecting fitting 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 21a (diameter 12 mm) and one temporary fastening hole 21b (diameter 6 mm) formed vertically. The upper mounting hole 21a is provided at a higher position and 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 body plate 21 and in the upper mounting hole 21a.

[0040] There are two second side plates 22, each standing rearward from both the left and right ends of the second main body plate 21 and facing each other. The second side plate 22 constitutes a receiving hook in which a substantially U-shaped guide groove 22a is formed so as to open upward, and the second side plate 22 itself has a substantially J-shape. The lower part 22b of the guide groove 22a of the receiving hook has a diameter larger than the diameter (9 mm) of the locking part 15, and is a part of an ellipse that is slightly longer in the front-to-rear direction, consisting of an arc and a line segment, and the front part 22c of the guide groove is formed so as to incline slightly forward as it goes from top to bottom, and the rear end 22d of the guide groove is also formed so as to incline forward as it goes from top to bottom. This shape makes it easy to insert the locking part 15 when joining metal fittings together. The oval portion of the lower part 22b of the guide groove of the receiving hook is made up 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 the locking part 15 is received by the receiving hook during installation, and the position of the slat 1 in the fore-aft direction is adjusted, if the locking part 15 is near the flat part, it can easily move horizontally. In other words, outside 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 to have some unevenness to prevent misalignment with the locking part 15 after installation. The distance between the outer surfaces of the second side plates 22 is less than the distance between the inner surfaces of the first side plates 12 .

[0041] 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 approximately the center of the second upper plate 23. That is, a hole is formed in approximately the center of the second upper plate 23, and a tap (M8 tap) is cut in the hole. The position of this female screw 23a is a portion of the second upper plate 23 that is directly below the center of the long hole 13a of the first upper plate 13 when the first connecting fitting 10 and the second connecting fitting 20 are fitted together.

[0042] The mounting structure of the exposed staircase in which the thus configured connecting members 10, 20 for the exposed staircase are used will be described. The slats 1 are placed on the left and right sides of the exposed staircase. Alternatively, one side may have a slat 1 and the other side may have a wall or side panel supporting the treads of the exposed staircase. Here, we will explain one slat. As shown in Fig. 9(e), a mounting groove 1b that opens upward and forward is formed at the upper connection end 1a of the slat 1. On the other hand, the mounting groove 1b does not open downward. The mounting groove 1b itself is a U-shaped groove.

[0043] The rearward depth of the mounting groove 1b is drilled to a dimension such that the first side plate 12 of the first connecting fitting 10 does not protrude (expose) from the truss 1, and the first connecting fitting 10 is attached therein. The downward length of the mounting groove 1b extends long enough so that, when the fittings are attached by fitting together, the second connecting fitting 20 enters the mounting groove 1b with the tip of the J-shape of the second connecting fitting 20 below the locking portion 15 of the first connecting fitting. In detail, when the first main body plate 11 is attached to the rear wall of the mounting groove 1b with a coach bolt, as shown in Figure 10, 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, 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.

[0044] 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 specified distance (10 mm in this example) below the position of the top surface at the position where the stringer 1 is to be installed and the center line where the stringer 1 is to be installed 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 of 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, and if the position is different, the mounting position of the second connecting fitting is adjusted appropriately.

[0045] The first connecting fitting 10 is mated with the second connecting fitting 20 as shown in Figures 9(a) to 9(d).

[0046] 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).

[0047] 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 therein. Next, the girder 1 is advanced so that the front surface of the girder 1 is in close contact with the upper 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.

[0048] At this time, as shown in Fig. 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 stringer 1, and when the first connecting fitting 10 and the second connecting fitting 20 are fitted together, the front surface of the connection end 1a of the stringer 1 is in approximate contact with the upper structural member 2. In addition, 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 slat 1 with a wood screw. Furthermore, a removable cover may be provided on the top of the head of the wood screw to hide it by embedding it in the tread. In this case, by making the length of the bolt longer than a predetermined length, even if the bolt becomes loose, the head of the bolt will hit the underside of the tread, preventing the bolt 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 portion 12b), which is 10 mm in this example. The upper part of the slatted beam 1 is fixed by connecting fittings 10, 20, and then the lower part is fixed to a specified member such as a structural material for a floor.

[0049] According to the staircase mounting structure and staircase connecting member configured as described above, the effects of the first embodiment are achieved, and the mounting position of the first connecting fitting 10 to the mounting groove 1b of the slat 1 can be easily determined. The mounting position of the second connecting fitting 20 to the upper structural member 2 can be easily determined.

[0050] In addition, 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 pulling the connecting fittings 10, 20 away from the girder 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 ear portion 12b is used, even if the bolt becomes extremely loose, as long as footplate 3 is attached, the bolt head will be held down by footplate 3 and the bolt itself will not fall off, so safety is ensured.

[0051] Compared to the conventional method of directly attaching the slat 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 easy to position, combined with the ability to temporarily fasten the connecting fittings 10, 20. When connecting the girder 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 girder 1 in, or to apply force such as by screwing in a coach bolt, and since there is no possibility of tools coming into contact, there is no need to scratch visible parts after installation or prepare extra parts to hide them. In particular, when installing the rafters of a staircase designed to be visible after completion, it is desirable to carry out the work in a way that does not damage the parts that will be visible from the time of construction. For example, when connecting structural components that are hidden in the wall, the joints and metal fittings are designed to be tight and then hammered in to achieve a strong connection. However, with the configuration of this application, there is no need to hammer in the connections, which could cause damage, and the bolts are tightened at the end of construction to create a strong and secure connection. Furthermore, if the surface of the beam to which the girders are joined is tilted away from the vertical, and if it is designed to be tightly joined, it may not fit even if it is hammered. In addition, when combined with the fact that the girders are long, problems such as dimensional deviations at the other end arise, but the connecting fittings of the second embodiment of the present 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 connections that are tightly designed and hammered in, connections using the metal fittings of this invention make it easy to remove the rafters, making them 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 step 3 attached to the top of the connecting fittings 10, 20, adjusting the position of the rafter 1, for example, and tightening the bolts of the connecting fittings 10, 20.

[0052] 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.

[0053] Also, while the guide groove 22a of the receiving hook is said to be directed forward from above to below, this is not limited thereto, and it may simply be directed straight down. In addition, 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 taps are cut into the second upper plate 23 of the second connecting fitting 20, it is sufficient that the female thread 23a is formed, and for example, a nut may be welded.

[0054] In addition, the plate thickness of the first connecting fitting 10 and the second connecting fitting 20 is set to 2.3 mm, but 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.

[0055] 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 of the present invention without changing the gist of the present invention. In addition, the first upper plate 13 and the second upper plate 23 are spaced apart from each other, but the present invention is not limited to this.

[0056] The bending may be performed by a normal bending method for sheet metal other than pressing. The term "slat beam 1" is used here 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 beams using the connecting fittings in question, and such side panels are also referred to as "slat beam 1." In addition, the shape of the ear portion 12b may be various shapes as shown in Figure 12, and is not limited to these as long as its upper end is aligned with the upper end of the sash beam 1 when attached. The above has described the rafter as being attached 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 rafter is attached by attaching the second connecting fitting 20 to the beam portion. [Explanation of symbols]

[0057] 1. Sara digit 1a Connection end 1b Mounting groove 1c Seat carving 2nd floor structural members 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 fastening hole 22 Second side plate (receiving hook, second fitting portion) 22a Guide groove 22b Lower 22c front 22d rear end 23 Second Upper Plate 23a Female thread B Bolt

Claims

[Claim 1] A connecting member for a staircase, for attaching two members to each other, comprising: The connecting member includes a first connecting fitting, a second connecting fitting, and a connecting bolt, The first connecting fitting is provided with a first main body plate, a first upper plate standing forward from an upper end of the first main body plate and having a hole through which the connecting bolt passes, and a first locking portion standing forward from both left and right ends of the first main body plate and extending across first side plates facing each other, The second connecting fitting is provided with a second main body plate, a second upper plate that stands rearward from the upper end of the second main body plate and has a hole that screws into the connecting bolt, and a second locking portion that stands rearward from both left and right ends of the second main body plate and has a guide groove that opens upward in second side plates facing each other, the first engaging portion drops into the second engaging portion, the first connecting fitting and the second connecting fitting are fitted together, and the first connecting fitting and the second connecting fitting are accommodated in a mounting groove of one of the two members; A connecting member for stairs, characterized in that the first upper plate and the second upper plate are connected by the connecting bolt through a hole in the first upper plate.

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