Bracket for stair nose protection trim

Abstract

In a bracket for a stair nosing protection trim applied to concrete stairs, the temporary vertical holding position of the trim relative to the marking line can be adjusted more quickly and with less effort. [Solution] The bracket for a stair nose protective trim according to the present invention is configured such that when the extension directions of the first connecting piece 16 of the first bracket 10 and the second connecting piece 22 of the second bracket 11 coincide, the distance between the rear end of the first connecting piece 16 and the front end of the second connecting piece 22 is defined as the total length dimension D in the extension direction of both connecting pieces 16 and 22, the connecting structure 12 connecting the two brackets 10 and 11 includes an adjustment mechanism 28 that slides the two brackets 10 and 11 relative to each other so that the total length dimension D can be changed, and male and female screw bodies 29 and 30 that fasten and fix the two connecting pieces 16 and 22 in the thickness direction after changing to an arbitrary total length dimension D.

Description

Technical Field

[0001] The present invention relates to a bracket for a nose protection partition material, which temporarily holds the nose protection partition material during the construction of a concrete staircase and serves as an anchor for the nose protection partition material after the construction of the concrete staircase.

Background Art

[0002] For a concrete staircase, a nose protection partition material (hereinafter, appropriately referred to as a "partition material") is provided at the nose, which is the corner portion between the tread surface and the kick-in surface of each step, to prevent chipping of the nose and facilitate staircase construction. Such a concrete staircase is constructed by placing concrete in an assembled formwork to form a stepped foundation serving as a base, and applying finishing mortar to the surface of this foundation. During the construction of the finishing mortar, a bracket or the like fixed to the foundation is used to temporarily hold the partition material in accordance with the layout line marked prior to the construction, and the finishing mortar is applied in this state. After the finishing mortar is solidified, the bracket or the like is embedded in the finishing mortar and functions as an anchor for the partition material, and the partition material is firmly fixed to the nose.

[0003] As a conventional example of this type of bracket, for example, Patent Document 1 can be cited. The bracket (anchor) of Patent Document 1 includes a front horizontal piece, an inclined piece continuously extending obliquely downward rearward from the rear end of the horizontal piece, and a rear horizontal piece continuously extending horizontally rearward from the rear end of the inclined piece. A fastening hole formed by a long hole extending in the front-rear direction penetrates through the rear horizontal piece. In this bracket, first, the front horizontal piece is welded to the lower surface of the partition material (non-slip tool body) to integrate the two (partition material and bracket). Next, the partition material is aligned with the layout line, and in this state, a screw is screwed into the foundation (the base of the staircase) through the fastening hole to fasten and fix the bracket to the horizontal portion of the foundation, thereby temporarily holding the partition material.

Prior Art Documents

Patent Documents

[0004] [Patent Document 1] Microfilm of Utility Model Application No. 57-78750 (Utility Model Publication No. 58-181740) [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In the bracket of Patent Document 1, the fastening holes through which screws that secure the bracket to the foundation are inserted are formed as elongated holes. Therefore, even after the screws have been screwed into the foundation, the bracket can be moved back and forth by loosening the screws, allowing the front-to-back position of the trim piece relative to the marking line to be adjusted. However, since the stepped foundation is formed by pouring concrete into formwork and allowing it to harden, the vertical height dimension T1 (see Figure 6) from each horizontal section to the corresponding marking line is not constant. The bracket of Patent Document 1 does not allow for easy adjustment of the vertical position of the trim piece in response to variations in the height dimension T1, which is disadvantageous because it requires time and effort to temporarily hold the trim piece with the bracket and, consequently, to apply the finishing mortar. More specifically, in the bracket of Patent Document 1, adjusting the position of the trim piece upwards requires inserting a spacer between the horizontal section of the foundation and the rear horizontal piece to lift the entire structure. Adjusting the position of the trim piece downwards requires deforming the bracket so that the inclined piece approaches horizontal, thereby reducing the vertical dimension of the bracket.

[0006] The present invention aims to enable quick and easy adjustment of the temporary holding position of the stair nosing trim in the vertical direction relative to the marking line, in a bracket for stair nosing trim applied to concrete stairs. [Means for solving the problem]

[0007] The bracket for stair nose protection trim of the present invention comprises a first bracket 10 fixed to a staircase-shaped foundation 3, a second bracket 11 to which the trim 7 is fixed, and a connecting structure 12 that connects both brackets 10 and 11. The first bracket 10 comprises a fixing piece 15 made of a horizontal plate for fixing the first bracket 10 to the horizontal portion 3a of the foundation 3, and a first connecting piece 16 made of a plate that extends upward from the front end of the fixing piece 15 so as to bend upward. The second bracket 11 comprises a joining piece 21 made of a plate to which the trim 7, which is positioned with its longitudinal direction aligned with the left-right direction, is joined, and a second connecting piece 22 made of a plate that extends from the rear end of the joining piece 21 and overlaps with the first connecting piece 16. Furthermore, when the distance between the rear end of the first connecting piece 16 and the front end of the second connecting piece 22, when the extension directions of both connecting pieces 16 and 22 are aligned, is defined as the total length dimension D in the extension direction of both connecting pieces 16 and 22, the connecting structure 12 is characterized by comprising an adjustment mechanism 28 that relatively slides and guides both brackets 10 and 11 so that the total length dimension D can be changed, and male and female screw bodies 29 and 30 that fasten and fix both connecting pieces 16 and 22, which have been changed to an arbitrary total length dimension D, in the thickness direction.

[0008] The connecting structure 12 is provided with a connecting hole 31 through which a male screw body 30 is inserted. The connecting hole 31 is provided in either the first connecting piece 16 or the second connecting piece 22, and the male screw body 30 is provided in the other. The connecting hole 31 is formed as an elongated hole that is long in the direction of extension of the connecting piece 16 (22) in which the connecting hole 31 is formed. The adjustment mechanism 28 consists of a male screw body 30 that is guided relatively and a connecting hole 31 which is an elongated hole.

[0009] The fixing piece 15 has fastening holes 18 formed through it in the thickness direction for inserting fasteners 17 that fix the first bracket 10 to the foundation 3, and the fastening holes 18 are formed as elongated holes that are long in the front-to-back direction.

[0010] An opening 25 is formed in the second connecting piece 22, which penetrates in the thickness direction.

[0011] The connecting piece 21 is composed of a rectangular plate that is elongated in the left-right direction.

[0012] The connecting piece 21 and the second connecting piece 22 are arranged in a bent shape. When the angle of refraction between the fixed piece 15 and the first connecting piece 16 is defined as θ1, and the angle of refraction between the connecting piece 21 and the second connecting piece 22 is defined as θ2, both refraction angles θ1 and θ2 can be set to 135 degrees, and the connecting piece 21 can be arranged parallel to the fixed piece 15. [Effects of the Invention]

[0013] As in the present invention, if the total length dimension D (see Figure 5) in the extension direction of both connecting pieces 16 and 22, which are inclined with respect to the horizontal, can be changed, for example, by sliding the two brackets 10 and 11 relative to each other so that the total length dimension D increases, the connecting piece 21 can be displaced so that it is further forward and upward relative to the fixing piece 15, thereby increasing the vertical height dimension T2 (see Figure 5) from the fixing piece 15 to the connecting piece 21 to which the trim material 7 is joined. Also, by sliding the two brackets 10 and 11 relative to each other so that the total length dimension D decreases, the connecting piece 21 can be displaced so that it is closer to the fixing piece 15 so that it is further backward and downward, thereby decreasing the vertical height dimension T2 from the fixing piece 15 to the connecting piece 21 to which the trim material 7 is joined. Furthermore, if the connecting structure 12 is equipped with male and female threaded bodies 29 and 30 that fasten and fix both connecting pieces 16 and 22, whose overall length D has been changed to an arbitrary length, in the thickness direction, the second bracket 11 can be positioned at the height dimension T2 adjusted by the adjustment mechanism 28, and the trim material 7 can be accurately temporarily held at the desired height position. The height dimension T2 can also be readjusted by tightening and loosening the male and female threaded bodies 29 and 30.

[0014] As described above, by using the bracket for stair nose protection trim of the present invention, the temporary holding position of the trim 7 in the vertical direction relative to the marking line L can be adjusted quickly and with less effort. Furthermore, by using the bracket for stair nose protection trim of the present invention, the application time of the finishing mortar 4 can be shortened.

[0015] A connecting hole 31 is provided in either the first connecting piece 16 or the second connecting piece 22 through which a male threaded body 30 is inserted, and the male threaded body 30 is provided in the other. The connecting hole 31 is formed as an elongated hole that is long in the direction of extension of the connecting piece 16 (22) in which the connecting hole 31 is formed. If the adjustment mechanism 28 is composed of a male threaded body 30 that is relatively guided and a connecting hole 31 consisting of an elongated hole, then the male threaded body 30 of the male and female threaded bodies 29 and 30 that fasten and fix both brackets 10 and 11 can be shared by the adjustment mechanism 28. This simplifies the structure of the adjustment mechanism 28 and prevents an increase in the manufacturing cost of the bracket for the stair nose protection trim.

[0016] A fastening hole 18 is formed through the fixing piece 15 in the thickness direction for inserting a fastener 17 that fixes the first bracket 10 to the foundation 3. If the fastening hole 18 is formed as an elongated hole that is long in the front-to-back direction, even after the bracket 1 for the stair nose protection trim material is fixed to the foundation 3 with the fastener 17, the position of the trim material 7 in the front-to-back direction can be adjusted more accurately with respect to the marking line L by slightly loosening the fastener 17 and moving the entire bracket 1 for the stair nose protection trim material back and forth. At this time, there is no need to remove the fastener 17 from the foundation 3, so the adjustment of the temporary holding position of the trim material 7 in the front-to-back direction with respect to the marking line L can be done easily with less effort.

[0017] If an opening 25 is formed in the second connecting piece 22 that penetrates in the thickness direction, it is possible to visually check through the opening 25 whether the finishing mortar 4 has been properly applied to the lower side of the bracket 1 for the stair nose protection trim during the application of the finishing mortar 4, thereby preventing defects in the application of the finishing mortar 4. Furthermore, after the finishing mortar 4 has hardened, the finishing mortar 4 will flow into the opening 25, allowing the bracket 1 for the stair nose protection trim to effectively perform its anchoring function for the trim 7.

[0018] The parting material 7 is joined to the joining piece 21 in a posture where its longitudinal direction is along the left - right direction. Therefore, as in the present invention, when the joining piece 21 is composed of a rectangular plate body that is long in the left - right direction, the welding length, that is, the welding area, between the parting material 7 and the joining piece 21 can be increased. As a result, the two (the parting material 7 and the joining piece 21) can be firmly integrated, and after the finishing mortar 4 solidifies, the parting material 7 can be firmly fixed to the nose of the step.

[0019] The joining piece 21 and the second connecting piece 22 are provided in a bent shape. When the bending angle formed by the fixing piece 15 and the first connecting piece 16 is defined as θ1, and the bending angle formed by the joining piece 21 and the second connecting piece 22 is defined as θ2, both bending angles θ1 and θ2 are set to 135 degrees, and the joining piece 21 is configured to be arranged parallel to the fixing piece 15. According to this, in the normal state, the joining piece 21 that is parallel to the fixing piece 15 can be changed to a posture where the joining piece 21 is vertical by reversing the front and back of the second bracket 11 and connecting it to the first bracket 10. Therefore, with one type of bracket 1 for the nose - protecting parting material, it is possible to adopt two postures: a posture where the joining piece 21 is horizontal and a posture where the joining piece 21 is vertical.

Brief Explanation of Drawings

[0020] [Figure 1] It is a perspective view showing a state where the nose - protecting parting material is temporarily held by the bracket for the nose - protecting parting material according to an embodiment of the present invention. [Figure 2] It is a cross - sectional perspective view showing a schematic structure of a staircase. [Figure 3] It is a cross - sectional plan view of a staircase to which the same bracket is applied. [Figure 4] It is an exploded perspective view of the same bracket. [Figure 5] It is a longitudinal side view of the same bracket. [Figure 6] It is a view for explaining the state before the construction of the finishing mortar. [Figure 7] It is a longitudinal side view of a staircase to which the same bracket is applied. [Figure 8] It is a longitudinal side view showing a modified example of the nose - protecting parting material. [Figure 9] It is a longitudinal side view showing another modification of the nose protection parting material. [Figure 10] It is a longitudinal side view showing a modification of the concrete staircase.

Mode for Carrying Out the Invention

[0021] (Embodiment) FIGS. 1 to 8 show an embodiment of a bracket for a nose protection parting material according to the present invention. In this embodiment, front and rear, left and right, and up and down follow the cross arrows shown in FIGS. 1, 2, and 5 and the front and rear, left and right, and up and down indications written near each arrow. As shown in FIGS. 2 and 3, the staircase 2 to which the bracket 1 for the nose protection parting material of this embodiment (hereinafter, appropriately referred to as the "bracket 1 for the parting material") is applied is a concrete staircase constructed of a stepped foundation 3 that is a base formed by placing concrete in an assembled formwork and a finishing mortar 4 that is applied to the surface of the foundation 3 and solidified. In addition, after the formation of the foundation 3, when there are significant irregularities on the surface, it is desirable to apply troweling mortar to the horizontal portion 3a to level the surface of the horizontal portion 3a.

[0022] The staircase 2 has a plurality of treads 5 composed of horizontal planes formed at a predetermined height and kicking surfaces 6 formed in the vertical direction from the inner ends of each tread 5, and a parting material (nose protection parting material) 7 is provided at the nose, which is the corner portion between the tread 5 and the kicking surface 6 of each step. The parting material 7 of this embodiment is composed of a square bar having a square cross-section formed of stainless steel.

[0023] In Figure 6, the symbol L indicates the marking line drawn on the wall surface W prior to the application of the finishing mortar 4. As shown in Figure 6, the trim bracket 1 during the construction of the stairs 2 is fixed to the foundation 1 and temporarily holds the trim 7 in place along the marking line L. As shown in Figure 7, after the construction of the stairs 2, the trim bracket 1 is embedded in the finishing mortar 4 and functions as an anchor for the trim 7. The trim bracket 1 comprises a first bracket 10 fixed to the staircase-shaped foundation 3, a second bracket 11 to which the trim 7 is fixed, and a connecting structure 12 that connects both brackets 10 and 11.

[0024] As shown in Figures 1 and 4, the first bracket 10 comprises a fixing piece 15 for fixing the bracket 10 to the foundation 3, and a first connecting piece 16 extending from the front end of the fixing piece 15 so as to bend forward and upward (upward). The fixing piece 15 is made of a horizontal plate and is formed in a rectangular shape that is long in the front-to-back direction, and the first connecting piece 16 is made of an inclined plate and is formed in a rectangular shape that is long in the direction of extension of the connecting piece 16. The width dimensions of the fixing piece 15 and the first connecting piece 16 in the left-to-right direction are formed to be the same. The fixing piece 15 has fastening holes 18 formed through it in the thickness direction for inserting screws (fasteners) 17 for fixing the first bracket 10 to the foundation 3, and the fastening holes 18 are made of elongated holes that are long in the front-to-back direction.

[0025] The first bracket 10 is formed by cutting a stainless steel plate into a predetermined shape and then bending it. The first bracket 10 is fixed to the horizontal section 3a of the foundation 3, and is fastened to the foundation 3 by screwing screws 17 inserted through fastening holes 18 into the horizontal section 3a of the foundation 3. When the angle of refraction between the fixing piece 15 and the first connecting piece 16 is defined as θ1, the angle of refraction θ1 of the first bracket 10 is set to 135 degrees (obtuse angle).

[0026] As shown in Figures 1 and 4, the second bracket 11 comprises a joining piece 21 to which the trim material 7 is joined, and a second connecting piece 22 that extends from the rear end of the joining piece 21 so as to bend downward and rearward (downward) and overlaps with the first connecting piece 16. The joining piece 21 is made of a horizontal plate and is formed in a long rectangular shape in the left-right direction, parallel to the fixing piece 15. The second bracket 11, like the first bracket 10, is formed by cutting a stainless steel plate into a predetermined shape and then bending it.

[0027] The width of the connecting piece 21 is larger than the width of the fixing piece 15. In this embodiment, the width of the fixing piece 15 is set to 12 mm, and the width of the connecting piece 21 is set to 60 mm. By making the width of the connecting piece 21 larger than the width of the fixing piece 15, the bracket 1 for the trim material can be made lighter while increasing the welding length between the trim material 7 and the connecting piece 21, thereby increasing the joint strength between the trim material 7 and the connecting piece 21. With the trim material 7 and connecting piece 21 having increased joint strength, the load-bearing capacity that resists deformation can be improved. For example, even if a large external force acts on the stairs 2 due to an earthquake, the trim material 7 can be prevented from separating from the bracket 1. Furthermore, since the bracket 1 can firmly hold the trim material 7, even in environments where the trim material 7 is subjected to loads from multiple people or repeated loads, such as stairs in facilities where many people gather, such as stadiums, damage to the stairs due to the trim material 7 peeling off can be prevented.

[0028] The second connecting piece 22 is located on the far side from the joining piece 21 and consists of a connecting portion 23 that is long in the direction of extension of the second connecting piece 22 and a widening portion 24 that is formed to gradually widen from the front end of the connecting portion 23 in the left-right direction and is continuous with the rear end of the joining piece 21. The widening portion 24 is formed in a roughly isosceles triangle shape, with the connecting portion 23 continuous on the apex side and the joining piece 21 continuous on the base side. The boundary between the connecting portion 23 and the widening portion 24 is rounded. An opening 25 that penetrates in the thickness direction is formed in the center of the widening portion 24, and this opening 25 is composed of a through hole that is roughly isosceles triangle-shaped and similar to the widening portion 24. When the refraction angle between the joining piece 21 and the second connecting piece 22 is defined as θ2, the refraction angle θ2 of the second bracket 11 is set to 135 degrees (obtuse angle).

[0029] As shown in Figures 4 and 5, the connecting structure 12 includes an adjustment mechanism 28 that slides relative to both connecting pieces 16 and 22 so that the total length dimension D in the extension direction of both connecting pieces 16 and 22, which is defined by the rear end of the first connecting piece 16 and the front end of the second connecting piece 22 when the extension directions of both connecting pieces 16 and 22 coincide, can be changed; male and female threaded bodies 29 and 30 that fasten and fix both connecting pieces 16 and 22 in the thickness direction after the total length dimension D has been changed to an arbitrary value; and a connecting hole 31 through which the male threaded body 30 is inserted. The male threaded body 30 is made up of a bolt shaft, and the female threaded body 29 is made up of a hexagonal nut that screws onto the male threaded body 30.

[0030] The male threaded body 30 is provided on the first connecting piece 16 of the first bracket 10, and is projected upward and rearward from near the tip of the first connecting piece 16 such that its axis is aligned with the thickness direction of the connecting piece 16. The male threaded body 30 is integrally fixed to the first connecting piece 16 by welding. The connecting hole 31 is formed through the connecting portion 23 that constitutes the second connecting piece 22 of the second bracket 11, and is an elongated hole that is long in the direction of extension of the connecting piece 22. The adjustment mechanism 28 consists of the male threaded body 30 and the connecting hole 31, and the connecting hole 31, which is an elongated hole, is guided by the male threaded body 30, so that both connecting pieces 16 and 22 slide relative to each other in the direction of extension. The procedure for connecting both brackets 10 and 11 is to first place the second connecting piece 22 on top of the first connecting piece 16 so that the male threaded body 30 is inserted through the connecting hole 31. Next, the female threaded body 29 is screwed onto the male threaded body 30 and tightened, so that the second connecting piece 22 is sandwiched between the first connecting piece 16 and the female threaded body 29. As a result, both connecting pieces 16 and 22 are fastened and fixed by the male and female threaded bodies 29 and 30, and the two brackets 10 and 11 are connected.

[0031] As mentioned above, the stepped foundation 3 is formed by pouring concrete into formwork, so the vertical height dimension T1 from each horizontal section 3a of the foundation 3 to the corresponding marking line L shown in Figure 6 may not be constant for each step. Therefore, the trim material 7 is temporarily held in place along the marking line L using the trim material bracket 1 of this embodiment. The trim material 7 is welded and fixed to the connecting piece 21 prior to the application of the finishing mortar 4. The number of trim material brackets 1 to be used can be determined by the length dimension of the trim material 7 in the left-right direction, and in this embodiment, the trim material 7 is temporarily held in place with two trim material brackets 1 (see Figure 3).

[0032] The following describes an example of a method for temporarily holding a trim piece 7 using a trim piece bracket 1. First, measure the height dimension T1 between the horizontal part 3a of the foundation 3 and the corresponding marking line L at the step where the trim piece 7 will be temporarily held as shown in Figure 6. Connect both brackets 10 and 11 in the previous procedure so that the height dimension between the lower surface of the fixing piece 15 and the upper surface of the trim piece 7 approximates the measured height dimension T1 as shown in Figure 5. Next, roughly align the trim piece 7 with respect to the marking line L, and in this state, screw the screws 17 into the foundation 3 through the fastening holes 18 and tighten them to temporarily fix the trim piece bracket 1 to the foundation 3. It is preferable that the position of the screws 17 relative to the fastening holes 18 be in the central part of the fastening holes 18, which are long in the front-to-back direction. By screwing the screws in the central part of the fastening holes 18, the adjustment range of the trim piece 7 in the front-to-back direction can be made approximately the same in the front-to-back direction during subsequent adjustment work.

[0033] At this point, the positional relationship between the marking line L and the trim piece 7 is checked again, and if there is a misalignment, the temporary holding position of the trim piece 7 is adjusted. The adjustment is performed by first loosening the female screw body 29 so that the second bracket 11 can slide relative to the first bracket 10. In this state, if the second bracket 11 is moved so that the total length dimension D in the extension direction of both connecting pieces 16 and 22 is increased (by moving the second bracket 11 from the position shown by the solid line in Figure 5 to the position shown by the dashed line), the trim piece 7 moves forward and upward, and the distance between the lower surface of the fixing piece 15 and the upper surface of the trim piece 7 increases. In other words, the temporary holding position of the trim piece 7 can be adjusted upward. Conversely, if the second bracket 11 is moved so that the overall length D of both connecting pieces 16 and 22 in the extension direction is shortened (by moving the second bracket 11 from the position shown by the dashed line in Figure 5 to the position shown by the solid line), the trim piece 7 moves downward and backward, reducing the distance between the lower surface of the fixing piece 15 and the upper surface of the trim piece 7. In other words, the temporary holding position of the trim piece 7 can be adjusted downward. After aligning the upper and lower temporary holding positions of the trim piece 7 with the marking line L, the female screw body 29 is tightened to connect both brackets 10 and 11.

[0034] When the trim piece 7 is adjusted upward, it also moves forward, and when the trim piece 7 is adjusted downward, it also moves backward. The position of the trim piece bracket 1 is adjusted to align the trim piece 7 with the marking line L, taking these movements into account. This adjustment is performed by loosening the screws 17 so that the trim piece bracket 1 can slide relative to the foundation 3, and then moving the trim piece bracket 1 back and forth. After aligning the front and rear temporary holding positions of the trim piece 7 with the marking line L, the screws 17 are tightened to fix the trim piece bracket 1 to the foundation 3. With these steps, as shown in Figure 1, the trim piece bracket 1 can be fixed to the horizontal section 3a of the foundation 3, and the trim piece 7 can be accurately temporarily held in place along the marking line L.

[0035] After adjusting the trim bracket 1 on each step of the foundation 3 and temporarily holding the trim 7 in place on all steps, the stairs 2 are finished by applying the finishing mortar 4 in order from the bottom step. When applying the finishing mortar 4 to the underside of the trim bracket 1, the application of the finishing mortar 4 is carried out while visually confirming that the finishing mortar 4 is wrapping around to the underside of the second bracket 11 through the opening 25. After the finishing mortar 4 has hardened, the trim bracket 1 is embedded in the finishing mortar 4 with the finishing mortar 4 wrapping around the opening 25 (see Figure 7).

[0036] Figure 8 shows a modified example with a different shape for the trim piece 7. The trim piece 7 is made of a stainless steel flat bar, and is installed with the thickness direction of the flat bar aligned with the vertical direction and the longitudinal direction aligned with the horizontal direction.

[0037] Figure 9 shows a modified example of the trim material 7 made of flat bar, with a different mounting direction, where the second bracket 11 is inverted and connected to the first bracket 10. In this embodiment, the fixing piece 15 and the connecting piece 21 are arranged in parallel, and both the bending angle θ1 of the first bracket 10 and the bending angle θ2 of the second bracket 11 are set to 135 degrees. Therefore, when the second bracket 11 is connected to the first bracket 10 with its front and back reversed from the above orientation, the connecting piece 21 is positioned vertically, and the trim material 7 can be installed with its thickness direction aligned front to back.

[0038] Figure 10 shows a modified example with a different configuration of the tread 5 and riser 6. In this staircase 2, tiles 35 are fixed to the surface of the finishing mortar 4 on the tread 5 and riser 6, resulting in a tiled finish. Thus, the tread 5 and riser 6 can be finished with either mortar or tiles.

[0039] As described above, in the trim bracket of this embodiment, the adjustment mechanism 28 of the connecting structure 12 allows the overall length dimension D in the extension direction of both connecting pieces 16 and 22, which are inclined with respect to the horizontal, to be changed. By sliding the two brackets 10 and 11 relative to each other so that the overall length dimension D increases, it becomes possible to displace the joining piece 21 away from the fixing piece 15 in a forward and upward direction, thereby increasing the vertical height dimension T2 from the fixing piece 15 to the joining piece 21 to which the trim 7 is joined. Conversely, by sliding the two brackets 10 and 11 relative to each other so that the overall length dimension D decreases, it becomes possible to displace the joining piece 21 closer to the fixing piece 15 in a backward and downward direction, thereby decreasing the vertical height dimension T2 from the fixing piece 15 to the joining piece 21 to which the trim 7 is joined. Furthermore, the male and female threaded bodies 29 and 30 of the connecting structure 12 allow the two connecting pieces 16 and 22, whose overall length dimension D has been arbitrarily changed, to be fastened and fixed in the thickness direction. This allows the trim bracket 1 to be held at the height dimension T2 adjusted by the adjustment mechanism 28, and the trim 7 to be accurately temporarily held at the desired height position. Another advantage is that when readjusting the height dimension T2, the adjustment can be performed simply by tightening and loosening the male and female threaded bodies 29 and 30.

[0040] As described above, the trim bracket 1 of this embodiment makes it possible to quickly adjust the temporary holding position of the trim 7 in the vertical direction relative to the marking line L with less effort, and in turn contributes to shortening the construction time of the finishing mortar 4. Furthermore, since the stair nosing portion of the stairs 2 can be constructed with the trim 7, the stair nosing portion can be finished with ease of construction and a beautiful finish, regardless of the plasterer's skill level.

[0041] The connecting structure 12 includes a connecting hole 31 formed in the second connecting piece 22, which is an elongated hole in the direction of extension through which the male threaded body 30 is inserted. The adjustment mechanism 28 is composed of the relatively guided male threaded body 30 and the elongated connecting hole 31. As a result, the male threaded body 30 of the male and female threaded bodies 29 and 30 that fasten and fix the two brackets 10 and 11 can be shared by the adjustment mechanism 28. This simplifies the structure of the adjustment mechanism 28 and reduces the cost increase that would result from the complexity of the connecting structure 12.

[0042] Since the fastening holes 18 for inserting screws 17 that fix the first bracket 10 to the foundation 3 are formed as elongated holes that are long in the front-to-back direction, even after fixing the trim bracket 1 to the foundation 3 with screws 17, the front-to-back position of the trim 7 can be adjusted more accurately with respect to the marking line L by slightly loosening the screws 17 and moving the entire trim bracket 1 back and forth. At this time, it is not necessary to remove the screws 17 from the foundation 3, so it is possible to adjust the temporary holding position of the trim 7 in the front-to-back direction with respect to the marking line L with less effort and in a simpler manner.

[0043] Since an opening 25 is formed in the second connecting piece 22 that penetrates in the thickness direction, it becomes possible to visually check through the opening 25 whether the finishing mortar 4 is properly applied to the lower surface of the trim bracket 1 when applying the finishing mortar 4, thereby preventing defects in the application of the finishing mortar 4. Furthermore, after the finishing mortar 4 has hardened, the finishing mortar 4 will flow into the opening 25, allowing the trim bracket 1 to effectively perform its anchoring function for the trim 7.

[0044] The trim piece 7 is joined to the connecting piece 21 with its longitudinal direction aligned with the left-right direction. In this embodiment, since the connecting piece 21 is made of a rectangular plate that is long in the left-right direction, it is possible to increase the welding length, i.e., the welding area, between the trim piece 7 and the connecting piece 21, thereby firmly integrating the two (trimming piece 7 and connecting piece 21) and securely fixing the trim piece 7 to the step nose after the finishing mortar 4 has hardened.

[0045] The joint piece 21 and the second connecting piece 22 are arranged in a bent shape, and the bending angle θ1 between the fixed piece 15 and the first connecting piece 16 and the bending angle θ2 between the joint piece 21 and the second connecting piece 22 are set to 135 degrees, and the joint piece 21 is configured to be positioned parallel to the fixed piece 15. With this configuration, the joint piece 21, which is normally parallel to the fixed piece 15, can be changed to a vertical position by reversing the second bracket 11 and connecting it to the first bracket 10, so that the joint piece 21 can be positioned in two ways with one type of trim bracket 1: a horizontal position and a vertical position.

[0046] In addition to the above, the male threaded body 30 may be provided on the second connecting piece 22 and the connecting hole 31 may be provided on the first connecting piece 16, or the female threaded body 29 made of a nut may be provided on the second connecting piece 22 and the male threaded body 30 made of a hexagonal bolt may be screwed into the female threaded body 29 via the connecting hole 31. The adjustment mechanism 28 can be composed of the second connecting piece 22 and a guide groove provided on the first connecting piece 16 that slides and guides the second connecting piece 22. The bending angle θ1 of the first bracket 10 and the bending angle θ2 of the second bracket 11 are not limited to obtuse angles, but may be right angles or acute angles. The trim material 7 of the present invention may have an L-shaped cross-section and may be made of a non-slip material that has anti-slip properties. [Explanation of symbols]

[0047] Bracket for 1-step nose trim protection material 3 Basics 3a Horizontal section of the foundation 7-step nose trim protective material 10 First bracket 11. Second bracket 12 Connection structure 15 Fixed piece 16 1st connection piece 17 Fasteners (screws) 18 Fastening hole 21 Joint piece 22 Second connection piece 25 Opening 28 Adjustment mechanism 29 Female threaded body 30 Male screw body 31 Connection hole D. Total length of both connecting pieces in the extension direction θ1 is the angle of refraction between the fixed piece and the first connecting piece. θ2 is the angle of refraction between the connecting piece and the second connecting piece.

Claims

1. A first bracket (10) is fixed to the stepped foundation (3), The second bracket (11) to which the stair nose protective trim (7) is fixed, A connecting structure (12) that connects both brackets (10 and 11), Equipped with, The first bracket (10) comprises a fixing piece (15) made of a horizontal plate for fixing the first bracket (10) to the horizontal portion (3a) of the foundation (3), and a first connecting piece (16) made of a plate that extends upward from the front end of the fixing piece (15) so as to bend upward. The second bracket (11) comprises a joining piece (21) made of a plate to which a stair nose protection trim (7) oriented with its longitudinal direction aligned with the left-right direction is joined, and a second connecting piece (22) made of a plate extending from the rear end of the joining piece (21) and overlapping with the first connecting piece (16). A bracket for a stair nose protection trim, characterized in that, when the distance between the rear end of the first connecting piece (16) and the front end of the second connecting piece (22) in a state where the extension directions of both connecting pieces (16 and 22) coincide is defined as the total length dimension (D) in the extension direction of both connecting pieces (16 and 22), the connecting structure (12) comprises an adjustment mechanism (28) that relatively slides and guides both brackets (10 and 11) so that the total length dimension (D) can be changed, and male and female screw bodies (29 and 30) that fasten and fix both connecting pieces (16 and 22), which have been changed to an arbitrary total length dimension (D), in the thickness direction.

2. A connecting hole (31) is provided in either the first connecting piece (16) or the second connecting piece (22) through which a male threaded body (30) is inserted, and the other is provided with a male threaded body (30). The connecting hole (31) is formed as an elongated hole that is long in the direction of extension of the connecting piece (16 (22)) in which the connecting hole (31) is formed. The bracket for a stair nose protection trim according to claim 1, wherein the adjustment mechanism (28) is composed of a male screw body (30) that is guided relatively and a connecting hole (31) which is an elongated hole.

3. A fastening hole (18) is formed through the fixing piece (15) in the thickness direction for inserting a fastener (17) that fixes the first bracket (10) to the foundation (3). The bracket for a stair nose protection trim according to claim 1, wherein the fastening hole (18) is formed as an elongated hole that is long in the front-to-back direction.

4. The bracket for a stair nose protective trim according to claim 1, wherein an opening (25) is formed in the second connecting piece (22) that penetrates in the thickness direction.

5. The bracket for a stair nose protection trim according to claim 1, wherein the connecting piece (21) is composed of a rectangular plate that is long in the left-right direction.

6. The connecting piece (21) and the second connecting piece (22) are arranged in a bent shape. When the angle of refraction between the fixed piece (15) and the first connecting piece (16) is defined as (θ1), and the angle of refraction between the joining piece (21) and the second connecting piece (22) is defined as (θ2), The bracket for a stair nose protection trim according to claim 1, wherein both bending angles (θ1, θ2) are set to 135 degrees, and the connecting piece (21) is arranged parallel to the fixing piece (15).

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