Stringer Staircase

Abstract

To make open string stairs look thin in a side view while suppressing the vibration of the open string stairs.SOLUTION: An open string stairs 10 includes an open string 20, a plurality of treads 30 which are provided in a staircase shape on the open string 20 and project to both sides from the open string 20, and a handrail receiving part 40 which is provided along a tip part 30T of the treads 30 overhanging from the open string, extends downward from the tip part 30T, and has a lower end part 40L arranged above a lower end part 20L of the open string 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to stringer stairs. [Background technology]

[0002] Stringer stairs are known that include stringers and a plurality of treads supported by the stringers (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-047526 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-135022 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-009360 Summary of the Invention [Problem to be solved by the invention]

[0004] From the viewpoint of design, it is conceivable to make the stringer staircase thinner when viewed from the side, but this may increase the vibration of the stringer staircase.

[0005] In consideration of the above facts, the present invention aims to suppress the vibration of stringer stairs while making the stringer stairs appear thinner when viewed from the side. [Means for solving the problem]

[0006] According to the first aspect A stringer staircase comprises a stringer, a plurality of treads arranged in a stepped manner on the stringer and extending on both sides from the stringer, and a handrail support arranged along the tip of the tread extending from the stringer, extending downward from the tip, and having its lower end positioned above the lower end of the stringer.

[0007] First aspect According to the stringer staircase described above, the plurality of treads are arranged in a stepped manner on the stringers and extend from both sides of the stringers. The handrail support is provided along the tip of the tread that extends from the stringers.

[0008] The handrail supports extend downward from the tips of the treads, and their lower ends are positioned above the lower ends of the stringers. This makes the stringer staircase thinner in side view than when the lower ends of the handrail supports are positioned at the same height as the lower ends of the stringers.

[0009] In addition, the lower end of the stringer is positioned further back (towards the center of the stringer staircase) than the lower end of the handrail support. This makes the lower end of the stringer less visible and less noticeable when viewed from the side. Therefore, with this invention, the stringer staircase can be made to look thinner when viewed from the side, thereby improving the design of the stringer staircase.

[0010] On the other hand, the lower ends of the stringers are positioned lower than the lower ends of the handrail supports. In other words, the vertical width (beam height) of the stringers is wider than the vertical width (beam height) of the handrail supports. As a result, in this invention, the vibration of the stringer staircase is suppressed compared to when the vertical width of the stringers is narrowed and the lower ends of the stringers are positioned at the same height as the lower ends of the handrail supports.

[0011] In this way, the present invention can suppress the vibration of the stringer stairs while making the stringer stairs appear thinner when viewed from the side.

[0012] According to the second aspect Stringer stairs are According to the first aspect The stringer staircase is provided with a plurality of risers that are provided on the stringers, extend from the stringers on both sides, connect the treads adjacent to each other above and below, and form a stepped cross section together with the treads.

[0013] Second aspectAccording to the stringer staircase described above, a plurality of risers are provided on the stringers. The risers extend from both sides of the stringers and connect adjacent treads vertically. This allows the plurality of treads and risers to form a stepped cross section.

[0014] By forming a stepped cross section using multiple treads and risers in this way, the bending rigidity of the multiple treads and risers that extend out from the stringers on both sides can be increased, thereby increasing the amount of extension of the treads and risers that extend out from the stringers on both sides.

[0015] In other words, the present invention allows the stringers to be positioned closer to the center of the treads, making the lower ends of the stringers less noticeable in side view, making the stringer staircase appear thinner.

[0016] According to the third aspect Stringer stairs are First aspect or According to the second aspect The stringer staircase is provided with a panel-shaped handrail supported by the handrail support, which has a U-shaped cross section with an open upper part and has a storage section that stores the lower end of the panel-shaped handrail.

[0017] Third aspect According to the stringer staircase described above, the handrail support has a receiving section with a U-shaped cross section that is open at the top. By receiving the lower end of the panel-shaped handrail in this receiving section, the panel-shaped handrail is supported by the handrail support.

[0018] By accommodating the lower end of the panel-shaped handrail in the accommodating portion of the handrail receiving portion in this manner, the panel-shaped handrail can be easily attached to the stringer staircase. [Effects of the Invention]

[0019] As described above, according to the present invention, it is possible to suppress the vibration of the stringer stairs while making the stringer stairs appear thinner when viewed from the side. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a side view of one embodiment of a stringer staircase. [Figure 2] FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. [Figure 3] FIG. 2 is an enlarged side view of the stringer shown in FIG. 1. [Figure 4] 3 is an enlarged cross-sectional view showing the handrail receiving portion shown in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, a stringer staircase according to one embodiment will be described with reference to the drawings.

[0022] (Stringer Stairs) Figure 1 shows a stringer staircase 10 according to this embodiment. The stringer staircase 10 is a steel-framed staircase. The stringer staircase 10 is installed diagonally on upper and lower structural members (not shown), such as beams and slabs.

[0023] As shown in Figure 2, the stringer staircase 10 comprises a pair of stringers 20, a plurality of treads 30, a plurality of risers 32 (see Figure 3), a pair of handrail supports 40, and a pair of glass handrails 60.

[0024] (stringer) The pair of stringers 20 are formed from metal plates such as steel plates and are installed diagonally on the upper and lower structural members (not shown) described above. The pair of stringers 20 are arranged along the longitudinal direction (arrow X direction) of the stringer staircase 10, with their thickness direction aligned with the width direction (arrow Y direction) of the stringer staircase 10. The pair of stringers 20 are arranged facing each other in the width direction of the stringer staircase 10.

[0025] 3, in a side view, the lower end 20L of the stringer 20 extends linearly along the longitudinal direction (direction of arrow X) of the stringer staircase 10 and is inclined relative to the horizontal plane in accordance with the gradient of the stringer staircase 10. Meanwhile, in a side view, a plurality of stepped (lightning bolt-shaped) steps 22 are formed at the upper part of the stringer 20. Each step 22 has an upper end surface 22U that supports a tread 30 and a side end surface 22S that supports a riser 32.

[0026] (treads and risers) The treads 30 and risers 32 are made of metal plates such as steel plates, and are arranged on a pair of stringers 20 with their longitudinal direction aligned with the width direction of the stringer staircase 10 (the direction of arrow Y in FIG. 2).

[0027] The tread 30 is disposed substantially horizontally and is joined by welding or the like while overlapping the upper end surface 22U of the step portion 22. On the other hand, the riser 32 is disposed substantially vertically and is joined by welding or the like while overlapping the side end surface 22S of the step portion 22.

[0028] The multiple treads 30 and risers 32 are integrated together. These treads 30 and risers 32 form a stepped cross section that conforms to the multiple steps 22 of the stringer 20. Specifically, the treads 30 and risers 32 are integrally formed by bending a single metal plate 34 into an L-shape.

[0029] In one metal plate 34, the lower end of the riser plate 32 is integrally connected to the end of the tread 30 via a bent portion. Meanwhile, the upper end of the riser plate 32 is butted against the end of the tread 30 of another adjacent metal plate 34, and joined (connected) by welding (continuous welding) or the like. In this way, the riser plate 32 connects the vertically adjacent treads 30. As a result, the corners (bent portions and joints) of the integrated treads 30 and riser plate 32 increase the bending rigidity (out-of-plane rigidity) of the treads 30 and riser plate 32.

[0030] In this embodiment, the tread 30 and the riser 32 are integrally formed by bending a single metal plate 34 into an L-shape. However, the tread 30 and the riser 32 may be separate bodies and then integrated by welding or the like.

[0031] As shown in Figure 2, each tread 30 is disposed across a pair of stringers 20. Each tread 30 extends from the pair of stringers 20 on both sides in the width direction (arrow Y direction) of the stringer staircase 10. In other words, the pair of stringers 20 are disposed at positions away from the longitudinal end (tip end 30T) of each tread 30 toward the center, supporting the longitudinal middle of each tread 30.

[0032] In this embodiment, the stringers 20 are positioned toward the center of each longitudinal end (tip end 30T) of the tread 30, at a distance of at least 1 / 3 of the longitudinal length L of the tread 30. Although not shown, the risers 32, like the treads 30, extend out from the pair of stringers 20 on both sides of the width of the stringer staircase 10.

[0033] (Handrail support) A handrail support 40 is provided at each end 30T on both sides of the step 30 that extends from the stringer 20. The handrail support 40 is provided along the end 30T of the step 30. The handrail support 40 also extends downward from the end 30T of the step 30, with the lower end 40L positioned above the lower end 20L of the stringer 20.

[0034] As shown in Figure 4, the handrail support 40 has a storage section 40V that stores the lower end 60L of the glass handrail 60. Specifically, the handrail support 40 has a U-shaped cross section that is open at the top. The handrail support 40 has a pair of inner and outer plates 50 and 52, and a bottom plate 54.

[0035] The pair of inner and outer plates 50, 52 are formed from metal plates such as steel plates, and face each other in the width direction (direction of arrow Y) of the stringer staircase 10. The outer plate 52 is disposed outside the inner plate 50.

[0036] The lower ends of the pair of inner and outer plates 50 and 52 are connected via a bottom plate 54. The inner plate 50, outer plate 52, and bottom plate 54 form a storage section 40V. The lower end 60L of the glass handrail 60 is stored (fitted) in this storage section 40V via a sealing material or the like (not shown).

[0037] The bottom plate 54 is formed of a metal plate such as a steel plate and is disposed substantially horizontally. One end of the bottom plate 54 is joined by welding (fillet welding) or the like in a state where it abuts against the inner surface 50A of the lower end of the inner plate 50. The other end of the bottom plate 54 is joined by welding (groove welding) or the like in a state where it abuts against the inner surface 52A of the lower end of the outer plate 52. A groove 56 is formed on the lower surface side of the other end of the bottom plate 54.

[0038] The inner plate 50 is positioned outside the tip 30T of the tread 30 and the tip of the riser plate 32 (not shown). The outer surface 50B of the upper part of this inner plate 50 is butted against the tip 30T of the tread 30 and the tip of the riser plate 32 (not shown) and joined by welding (continuous welding) or the like. In this way, the handrail support 40 is supported by the multiple treads 30 and riser plates 32.

[0039] In this embodiment, the upper ends of the inner plate 50 and the outer plate 52 protrude higher than the tread 30. However, the upper ends of the inner plate 50 and the outer plate 52 may be positioned at the same height as the tread 30.

[0040] As shown in Figure 1, when viewed from the side, the lower ends of the pair of inner and outer plates 50 and 52, i.e., the lower end 40L of the handrail support portion 40, extend linearly along the longitudinal direction of the stringer staircase 10 (direction of arrow X).

[0041] On the other hand, from a side view, a plurality of steps 42 are formed on the upper parts of the pair of inner and outer plates 50 and 52, i.e., on the upper part of the handrail support 40, from a design perspective. The plurality of steps 42 are formed in a staircase (lightning bolt) shape along the steps 22 of the stringer 20. Note that the upper end of the handrail support 40 may be formed in a straight line extending along the longitudinal direction of the stringer staircase 10 (direction of arrow X), for example.

[0042] (glass handrail) The glass handrail 60 is formed of, for example, transparent plate glass, etc. The upper end 60U of this glass handrail 60 extends linearly in the longitudinal direction of the stringer staircase 10 (the direction of arrow X) and is inclined relative to the horizontal plane according to the gradient of the stringer staircase 10.

[0043] A lower end 60L (see FIG. 2) of the glass handrail 60 extends linearly in the longitudinal direction of the stringer staircase 10 (direction of arrow X) and is inclined relative to the horizontal plane according to the gradient of the stringer staircase 10.

[0044] As shown in Figure 2, the lower end portions 60L of the glass handrails 60 are housed in the handrail receiving portions 40 on both sides of the stringer staircase 10. The glass handrails 60 also extend upward from the handrail receiving portions 40 on both sides of the stringer staircase 10. These glass handrails 60 face each other in the width direction (direction of arrow Y) of the stringer staircase 10. The glass handrails 60 are an example of a panel-like handrail.

[0045] (Finishing materials) A central finishing material 70 and a pair of outer finishing materials 72 are attached to the underside of the stringer staircase 10. The central finishing material 70 and the pair of outer finishing materials 72 are formed, for example, from wood panels or the like.

[0046] The central finishing material 70 is arranged approximately horizontally across the lower ends 20L of the pair of stringers 20. The central finishing material 70 is attached to the pair of stringers 20 via base materials 74. Outer finishing materials 72 are arranged on both sides of the central finishing material 70 in the width direction (direction of arrow Y) of the stringer staircase 10.

[0047] The outer finishing material 72 is disposed diagonally across the stringer 20 and the handrail support 40. The outer finishing material 72 is attached to the stringer 20 and the handrail support 40 via a base material 74.

[0048] The central finishing material 70 and the outer finishing material 72 may be provided as needed and may be omitted as appropriate.

[0049] (action) Next, the operation of this embodiment will be described.

[0050] As shown in Figure 3, in the stringer staircase 10 according to this embodiment, a plurality of treads 30 and risers 32 are arranged in a stepped pattern on a pair of stringers 20. As shown in Figure 2, each tread 30 extends outward from both sides of the pair of stringers 20. Similarly, each riser 32 (see Figure 3) extends outward from both sides of the pair of stringers 20.

[0051] The handrail support 40 is provided along the tip 30T of the tread 30 that protrudes from the stringer 20 and along the tip of the riser 32 (not shown). The handrail support 40 extends downward from the tip 30T of the multiple treads 30 and the tip of the riser 32, with the lower end 40L positioned above the lower end 20L of the stringer 20.

[0052] As a result, in this embodiment, the thickness G of the stringer staircase 10 is thinner when viewed from the side compared to when the lower end 40L of the handrail support portion 40 is positioned at the same height as the lower end 20L of the stringer 20, as shown in Figure 1.

[0053] Furthermore, the lower end 20L of the stringer 20 is positioned further back (towards the center of the stringer staircase 10) than the lower end 40L of the handrail support 40. This makes the lower end 20L of the stringer 20 less visible and less noticeable when viewed from the side. This makes the stringer staircase 10 appear thinner when viewed from the side, thereby improving the design of the stringer staircase 10.

[0054] On the other hand, the lower end 20L of the stringer 20 is positioned lower than the lower end 40L of the handrail support 40. In other words, the vertical width (beam depth) of the stringer 20 is wider than the vertical width (beam depth) of the handrail support 40. As a result, in this embodiment, vibration of the stringer staircase 10 is suppressed compared to when the vertical width of the stringer 20 is narrowed and the lower end 20L of the stringer 20 is positioned at the same height as the lower end 40L of the handrail support 40.

[0055] In this way, in this embodiment, the vibration of the stringer staircase 10 can be suppressed while making the stringer staircase 10 appear thinner when viewed from the side.

[0056] 3, a plurality of risers 32 are provided on the pair of stringers 20. The risers 32 extend outward from both sides of the pair of stringers 20 and connect adjacent treads 30 vertically. As a result, the plurality of treads 30 and risers 32 form a stepped cross section.

[0057] By forming a stepped cross section using multiple treads 30 and risers 32 in this way, it is possible to increase the bending rigidity of the multiple treads 30 and risers 32 that extend outward from the pair of stringers 20. This increases the amount of extension of the multiple treads 30 and risers 32 that extend outward from the pair of stringers 20. If there is a concern about the flexing of the treads 30 and risers 32, the thickness of the treads 30 and risers 32 may be increased as needed.

[0058] In other words, the pair of stringers 20 can be positioned closer to the center in the longitudinal direction (arrow Y direction) of the multiple treads 30 and risers 32. As a result, as shown in Figure 1, the lower ends 20L of the pair of stringers 20 become even less visible in a side view, making the stringer staircase 10 appear thinner.

[0059] Furthermore, by covering the underside of the stringer staircase 10 with a central finishing material 70 and a pair of outer finishing materials 72, the design of the stringer staircase 10 can be further enhanced.

[0060] 4, the handrail support 40 has a storage section 40V that has a U-shaped cross section that is open at the top. The glass handrail 60 is supported by the handrail support 40 by storing the lower end 60L of the glass handrail 60 in this storage section 40V.

[0061] By accommodating the lower end portion 60L of the glass handrail 60 in the accommodating portion 40V of the handrail receiving portion 40 in this manner, the panel-shaped handrail can be easily attached to the stringer staircase 10.

[0062] In addition, by attaching a transparent glass handrail 60 to the stringer staircase 10, the design of the stringer staircase 10 can be further improved.

[0063] (Variation) Next, a modification of the above embodiment will be described.

[0064] In the above embodiment, the panel-like handrail is the glass handrail 60. However, the panel-like handrail is not limited to the glass handrail 60, and may be, for example, a panel-like handrail made of resin, wood, or metal.

[0065] In the above embodiment, the plurality of treads 30 and risers 32 are integrated to form a stepped cross section. However, the plurality of treads 30 and risers 32 may be separate bodies rather than being integrated. The risers 32 may be provided as needed and may be omitted as appropriate.

[0066] In the above embodiment, the stringer staircase 10 is provided with a pair of stringers 20. However, the stringer staircase 10 is not limited to a pair (two) of stringers 20, and may be provided with one stringer 20 or three or more stringers 20. In other words, the stringer staircase 10 can be provided with at least one stringer 20.

[0067] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0068] 10 digit stairs 20 Stringers 20L bottom end (bottom end of stringer) 30 Treadboard 30T tip (tip of tread) 32 Kickboard 40 Handrail support 40L bottom end 40V housing 60 Glass Handrail 60L bottom end

Claims

1. Stringers and a plurality of treads provided in a stepped manner on the stringer and extending from both sides of the stringer; a handrail support provided continuously along the tip ends of the plurality of treads extending from the stringer, extending downward from the tip ends, and having a lower end located above the lower end of the stringer; Stringer staircase with.

2. a plurality of risers provided on the stringers, extending from both sides of the stringers, connecting adjacent treads in the vertical direction and forming a stepped cross section together with the treads; 2. The stringer staircase of claim 1.

3. A panel-shaped handrail is provided which is supported by the handrail receiving portion, The handrail receiving portion has a U-shaped cross section that is open at the top and has a receiving portion that receives the lower end of the panel-shaped handrail. Stringer staircase according to claim 1 or claim 2.

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