JPH0443533Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to handrails provided on rooftops, balconies, stairs, windows, etc., or architectural crosspieces provided on lattices, fences, gates, etc. [Prior Art] Conventionally, handrails installed on balconies, etc. for safety or crime prevention have been constructed by constructing upper and lower horizontal frame rods above and below a vertical frame with its lower end fixed to the floor, respectively, to form a frame. A frame rod was provided with a plurality of crosspieces spaced apart from each other, and the cross sections of these crosspieces were rectangular or cylindrical. Incidentally, in recent years, these frames and crosspieces have been made of stainless steel, aluminum alloy, etc., which have better corrosion resistance and aesthetic appearance than steel. However, especially with aluminum, aluminum alloys have low tensile strength.
Since it is approximately 20 kg/mm ² , it is impossible to maintain the specified strength unless it is thick. However, in recent years, thin rectangular and circular hollow crosspieces have been widely installed due to improvements in production technology. Such a thin hollow crosspiece has poor strength and is easily damaged, which may pose a safety problem. Furthermore, Japanese Patent Application Laid-open No. 58-558 relates to a replacement handrail installation method when replacing an old metal handrail attached to a balcony opening of a building with a new handrail. An example is disclosed in which the hollow portion also has a similar triangular shape. However, in the prior art, a triangular crosspiece is not disclosed in the support part, and there is no structure that is advantageous in terms of cost and prevents small objects from falling or passing from inside or outside while maintaining the strength as a support. I'm not used to it. Therefore, the present invention provides a crosspiece that is strong even though it is thin, and that prevents small objects from falling or passing through from inside and outside. [Means for Solving the Problems] The present invention provides metal bars provided at intervals on a frame such as a handrail, the cross section of the bars is triangular, the hollow portion is triangular in shape similar to the cross section, The base of the triangle faces inward, and the corners face outward. [Embodiment] Figures 1 and 2 show a first embodiment of the present invention showing a handrail. Aluminum alloy supports 12 and 13 are erected at predetermined intervals on a parapet cap 11, and these vertical frame rods 12 , 13 are provided with upper and lower horizontal frame rods 14 and 15 made of aluminum alloy. Then, aluminum alloy crosspieces 17 are erected and fixed at intervals of, for example, 110 mm to the upper and lower horizontal frame rods 14 and 15. This cross section 17 is a triangular tube with a triangular cross section and a hollow portion similar to the cross section, and is fixed with the bottom surface 17A facing the inside (interior) and the facing corner 17B facing the outside (outdoor). do. By installing the triangular cross section 17 whose cross section is triangular and whose hollow part is similar to the cross section as described above, it is strong even though it is thin, and like the rectangular cross section, it can prevent small objects from falling. , Handrail 18 that can prevent passing
can be assembled.

[Front] Square tubular crosspiece 19
Cylindrical crosspiece 20 shown in Figure 3 (C)
Next, the equilateral triangular cylindrical bar 17 and the square cylindrical bar 19 will be compared. Assuming that the cross-sectional area, that is, the weight of the material is the same, A ₁ = A ₂ , that is, √3/4 (B ² - b ² ) = H ² - ^{h 2} Examples of numerical values that satisfy the above equation are as follows. B=70mm b=57.8mm H=70mm h=65mm Therefore, in this case Z ₁ = 1/16√3 (70 ³ −57.8 ³ ) = 5.41×10 ³ (mm ³ ) Z ₂ = 1/6× 70 (70 ⁴ − 65 ⁴ ) = 1.470×10 ⁴ (mm ³ ) In this way, when comparing the values of Z ₁ and Z ₂ , even if the cross-sectional area is the same, the bending moment M (M = σZ, however,
The occurrence of σ (bending stress) is increased in the equilateral triangular cylindrical crosspiece 17, and a robust crosspiece can be provided. On the contrary, even if the equilateral triangular cylindrical crosspiece 17 is thin, the square cylindrical crosspiece 19
can have similar strength. Similarly, when comparing the equilateral triangular cylindrical crosspiece 17 and the cylindrical crosspiece 20, the above-mentioned B, b,
Set D and d as below. B=70mm b=57.8mm D=70mm d=63.6mm Therefore, Z ₃ = π/32 (70 ⁴ −63.6 ⁴ /70) = 2.29×10 ⁴ (mm ³ ) In this way, the In this case, the section modulus is larger than that of the equilateral triangular cylindrical crosspiece 17. As described above, when the unit weight is the same, the equilateral triangular cylindrical bar 17 can have a smaller bending moment value than the square cylindrical bar 19 and the cylindrical bar 20. Therefore, by making the cross section of the cross section an equilateral triangle and making the hollow part an equilateral triangle similar to the cross section, it has sufficient strength even if it is thin. Furthermore, by turning the bottom surface 17A inward and the corner 17B outward, the distance on the front side can be narrowed, and small objects can be prevented from passing through. FIG. 4 shows a second embodiment of the present invention showing a window lattice, in which a frame 22 for mounting is fixed to a window 21, and right triangular cylindrical crosspieces 23 are provided at predetermined intervals on this frame 22. The bottom surface 23A faces the window side 21, while the corner portion 2 facing the bottom surface 23A faces the window side 21.
Turn 3B outward. By forming the crosspiece 23 into a right triangular cylindrical shape in this manner, it is strong even if it is thin like the previous embodiment, and by oriented the bottom surface 23A toward the window, the distance on the front side can be narrowed. It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made, such as forming it into an isosceles triangular cylindrical shape or using aluminum as the material. [Effects] The present invention has metal bars installed at intervals on a frame such as a handrail, and the cross section of the bars is triangular.
The hollow part has a triangular shape similar to the cross section, and when the weight of the material is the same, it is possible to provide an architectural crosspiece that has sufficient strength even if it is thinner than the conventional technology, and has a triangular bottom surface. By facing inward and facing the opposite corners outward, it has the effect of preventing small objects from falling or passing through, similar to the conventional rectangular crosspiece.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a crosspiece showing the first embodiment of the present invention, Fig. 2 is a perspective view showing the same installation state, Fig. 3A is a sectional view of a triangular cylindrical crosspiece, and Fig. 3B is a square cylinder. FIG. 3C is a cross-sectional view of a cylindrical crosspiece, FIG. 4 is a front view showing a second embodiment of the present invention, and FIG. 5 is a conventional cross-sectional view of the same. 16, 22... frame body, 17, 23... crosspiece.

Claims (1)

[Scope of utility model registration request] For metal bars installed at intervals on a frame such as a handrail, the cross section of the bar is triangular, the hollow part is triangular in shape similar to the cross section, and the bottom face is turned inward, and the facing corners are An architectural crosspiece that is characterized by facing outward.