JP2004076281A - Spiral stairway - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spiral stairway superior in production/construction efficiency having a lightweight structure and light impression. <P>SOLUTION: The spiral stairway has a central column 10 erected in the vertical direction and a plurality of footboards 20 spirally arranged around the central column 10. The footboards 20 are supported by support members 30 overhanging from the central column 10, and the support members 30 adjacent in the height direction are connected to each other. The support members 30 are constituted by connecting a radial frame material and an outer peripheral frame material having connecting ends on both ends by an outer peripheral nodal point member having a connecting groove fittable with the connecting ends. The central column 10 is constituted by alternately out-fitting a ring-shaped central nodal point member 12 and a central spacer 13 to a core column, and the connecting groove fittable with the connecting ends of the respective frame materials is formed on the outside surface of the central nodal point member 12. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a spiral staircase.
[0002]
[Prior art]
Conventionally, a spiral staircase may be constructed inside or outside a building. The spiral staircase is configured by arranging a plurality of treads in a spiral shape around a vertical vertical support, and each tread is attached to the central support directly or via a bracket.
[0003]
[Problems to be solved by the invention]
By the way, since the tread of the spiral staircase is a cantilever, a very large bending moment and shear force act on the base end portion (the connection portion with the center support). Therefore, high flexural rigidity and high shear rigidity are required for the treads and the brackets that support them. However, if the dimensions and shape satisfy these requirements, they often become heavy members, resulting in a heavy impression. It becomes a spiral staircase.
[0004]
In addition, since each tread and bracket are attached to the center support at predetermined intervals in the height direction and shifted by a predetermined angle in plan view, it is very difficult to position them. Requires time and effort.
[0005]
Further, the processing of the center support must be performed each time in accordance with the installation conditions of the spiral stairs (number of steps, rise height, etc.), and is not suitable for mass production.
[0006]
Therefore, an object of the present invention is to provide a spiral staircase having a light structure and a light impression, and having good production and construction efficiency.
[0007]
[Means for Solving the Problems]
In order to solve such a problem, the invention according to claim 1 is a spiral staircase including a center support that stands upright in a vertical direction, and a plurality of treads that are spirally arranged around the center support, The tread plate is supported by a support member projecting from the central support, and the support members adjacent in a height direction are connected to each other.
[0008]
According to such a spiral staircase, the load acting on the tread plate acts on the support member supporting the upper tread plate and the support member supporting the lower tread plate of the tread plate, and the upper and lower support members resist bending. Thus, a lighter structure can be achieved as compared with the case where the tread plate is supported by one support member.
[0009]
A second aspect of the present invention is the spiral staircase according to the first aspect, wherein the support member is connected to two radial frame members projecting radially from the central support, and a tip of each of the radial frame members. Outer peripheral node member, and an outer peripheral frame member that connects the radial frame member via the outer peripheral node member, the radial frame member and the outer peripheral frame member each have a connection end portion at both ends, A connection groove in which the connection end can be fitted is formed on an outer surface of the center support and an outer surface of the outer peripheral node member.
[0010]
According to such a spiral staircase, since the support member is formed of the frame material, a spiral staircase with a light impression can be constructed. Also, the connection between the radial frame member and the center column is made simply by fitting the connection end of the radial frame member into the connection groove formed in the center column, and the connection end portion of the radial frame member and the connection end of the outer frame member are formed. Since the connection between the radial frame member and the outer peripheral frame member is made only by fitting the portions into the connection grooves formed in the outer peripheral node members, the construction of the spiral staircase is facilitated.
[0011]
According to a third aspect of the present invention, there is provided the spiral staircase according to the second aspect, wherein the radial frame member and the outer peripheral frame member each have a rectangular cross section.
[0012]
According to such a spiral staircase, since the tread can be placed on the upper surface of the radial frame material and the outer peripheral frame material over the entire length thereof, the bending of the tread plate is suppressed.
[0013]
According to a fourth aspect of the present invention, there is provided the spiral staircase according to the second or third aspect, wherein the outer peripheral node member is formed with two insertion holes along a vertical direction, and one of the insertion holes is used. The upper supporting member and the lower supporting member are connected to each other, and a handrail support that supports the handrail is attached using the other insertion hole.
[0014]
According to such a spiral staircase, since two insertion holes are formed in the outer peripheral node member, a handrail support for supporting the handrail can be easily attached.
[0015]
According to a fifth aspect of the present invention, there is provided the spiral staircase according to any one of the second to fourth aspects, wherein the center post alternately extrapolates a ring-shaped center node member and a center spacer to a core post. And a connection groove in which the connection end can be fitted is formed on an outer surface of each of the center node members.
[0016]
Such a spiral staircase has a vertical structure in which a center support that stands vertically has a double structure, and the height of a center spacer that is extrapolated to a core support can be easily adjusted by adjusting the height dimension. it can. Further, since the connection groove is formed only in the central node member, that is, the connection groove is formed only in the portion where the radial frame member is connected, the appearance is improved.
[0017]
The invention according to claim 6 is the spiral staircase according to claim 5, wherein the outer periphery of the core column is formed in a polygonal cross-section, and the inner periphery of the central node member has the shape of the outer periphery of the core column. It is characterized by being formed in a corresponding polygonal cross section.
[0018]
According to such a spiral staircase, since the outer periphery of the core column and the inner periphery of the central node member are each polygonal, when the central node member is extrapolated to the core column, they may rotate in the circumferential direction. Absent. That is, by simply extrapolating the center node member to the core post, the direction of the connection groove is accurately determined, so that the positioning is facilitated. For example, if the outer circumference of the core pillar and the inner circumference of the center node member are regular dodecagons, the direction of the connection groove of the center node member can be adjusted in steps of 30 degrees.
[0019]
The invention according to claim 7 is the spiral staircase according to claim 5, wherein engagement pieces that engage with each other are formed on an outer periphery of the core pillar and an inner periphery of the center node member, respectively. And
[0020]
According to such a spiral staircase, when the center node member is extrapolated to the core pillar, the engaging pieces formed on the center node member are engaged with each other, so that they do not rotate in the circumferential direction. That is, by simply extrapolating the center node member to the core post, the direction of the connection groove is accurately determined, so that the positioning is facilitated.
[0021]
The invention according to claim 8 is the spiral staircase according to any one of claims 2 to 7, wherein at least one of the center support, the radial frame material, the outer peripheral frame material, and the outer peripheral node member is provided. , Characterized in that it is an extruded member made of an aluminum alloy.
[0022]
According to such a spiral staircase, since a member constituting the spiral staircase is formed of an extruded member made of an aluminum alloy, the manufacturing is easy, and the advantages of the aluminum alloy, which is lightweight for the strength and hard to corrode, are utilized. be able to.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of a spiral staircase according to the present invention will be described in detail with reference to the accompanying drawings.
Here, FIG. 1A is a plan view of a spiral staircase according to the present invention, FIG. 1B is a front view, FIG. 2 is an enlarged front view, FIG. 3 is an enlarged side view, and FIG. FIG. 5 is an exploded perspective view, FIG. 6A is a cross-sectional view of the central node member, FIG. 6B is an enlarged cross-sectional view of FIG. 6A, and FIG. 6 (d) is a cross-sectional view of the tread plate mounting plate, FIG. 6 (e) is a cross-sectional view of the fixing plate, FIG. 7 is a plan view of the support member, and FIG. 8 (a) is a view of the support member. FIG. 8B is an enlarged perspective view illustrating a method of connecting the radial frame member (outer peripheral frame member) and the outer peripheral node member, and FIG. 9A is a perspective view of the radial frame member (outer peripheral frame member). 9 (b) is a side view of FIG. 9 (a), FIG. 10 is a plan view of the nodal member, FIG. 11 is an exploded perspective view of the handrail, and FIG. It is.
[0024]
The spiral staircase according to the present invention includes, as shown in FIG. 1, a center support 10 erected in the vertical direction, a plurality of treads 20 spirally arranged around the center support 10, and the tread 20. It comprises a supporting member 30 for supporting and a handrail 40. Further, as shown in FIGS. 2 to 4, support members 30, 30 adjacent in the height direction are connected to each other at their distal ends.
In the present embodiment, as shown in FIG. 1, twelve steps (D1 to D12) of treads are provided between the lower floor F1 and the upper floor F2, and Turning counterclockwise in plan view of the surroundings leads to the upper floor F2.
In the following description, the terms “front side” and “rear side” refer to the near side and the rear side, respectively, when facing the ascending direction of the stairs.
[0025]
(Center support)
As shown in FIGS. 1B and 2, the center support 10 is configured by alternately extrapolating a center node member (hereinafter, referred to as a center hub 12) and a center spacer 13 to a core pillar 11. In the present embodiment, as shown in FIG. 2, a tread plate mounting plate 14 is provided on the upper surface of the center hub 12, and a fixing plate 15 is provided on the lower surface.
[0026]
As shown in FIG. 4, the outer shape of the core pillar 11 is formed into a regular polygonal cross section (a regular dodecagon in the figure), and is made of a hollow extruded material made of an aluminum alloy.
[0027]
As shown in FIGS. 5 and 6 (a), the center hub 12 is formed in a ring shape, and its inner periphery is formed in a regular polygonal cross section (a regular dodecagon in the figure) corresponding to the outer periphery of the core pillar 11. That is, the inner peripheral shape of the center hub 12 is the same as the outer peripheral shape of the core column 11. The height of the center hub 12 is equal to the height of a connection end 31a (see FIG. 9) of the radial frame member 31 described later. Further, two connecting grooves 12a are formed on the outer surface of the center hub 12 along the vertical direction (see FIG. 8A).
The connecting groove 12a is formed in a shape to which a connection end 31a (see FIG. 9) of a radial frame member 31 described later can be fitted. As shown in FIG. Irregularities are formed to engage with irregularities of the connection end 31a of the connection 31. As shown in FIG. 6A, when the center hub 12 is viewed in a plan view, the two connection grooves 12a are each directed toward the center of the center hub 12, and have a central angle of 30 degrees.
The center hub 12 is made of an extruded member made of an aluminum alloy, and the connecting groove 12a is formed when the aluminum alloy is extruded.
[0028]
As shown in FIGS. 5 and 6C, the center spacer 13 has a ring shape, and has protrusions 13a formed on the inner surface thereof at a pitch of 120 degrees.
The protrusion 13 a has a contact surface that contacts along a corner of the outer surface of the core pillar 11, and prevents the rotation of the center spacer 13.
The center spacer 13 is formed of an extruded member made of an aluminum alloy, and the projection 13a is formed when extruding the aluminum alloy.
In the present embodiment, the cross-sectional shape of the center spacer 13 is such that only the protrusion 13a is in contact with the outer surface of the core pillar 11 in order to reduce the weight. However, the present invention is not limited to this. The ring portion may be solid.
[0029]
As shown in FIG. 5 and FIG. 6D, the tread plate mounting plate 14 is a ring-shaped plate member whose inner peripheral shape is formed to be the same as the outer peripheral shape of the core pillar 11. A mounting portion 14a is formed on the outer periphery of the tread mounting plate 14 so as to protrude outward.
As shown in FIG. 5 and FIG. 6E, the fixing plate 15 is a ring-shaped plate member having the same inner peripheral shape as the outer peripheral shape of the core pillar 11.
[0030]
As shown in FIG. 1B, the lower center having the same cross-sectional shape as the center spacer 13 is provided below the center hub 12 of the first stage D1 and above the center hub 12 of the twelfth stage D12, respectively. The spacer 13A and the upper center spacer 13B are extrapolated to the core pillar 11.
[0031]
(Treadboard)
The tread plate 20 is made of a wooden or metal plate material, and is formed in a substantially fan shape as shown in FIGS. Further, as shown in FIG. 5, bolt insertion holes 20a, 20a are formed at the distal end side of the tread plate 20, and bolt insertion holes 20b are formed at the base end side. In the present embodiment, the base end side of the tread plate 20 is supported and fixed to the mounting portion 14a of the tread plate mounting plate 14, and the distal end side is supported and fixed to the node members 33 and 34 via a fixing ring 36 described later.
[0032]
(Support member)
As shown in FIGS. 5 and 7, the support member 30 is connected to two radial frame members 31, 31 projecting radially from the center support column 10 (center hub 12), and to the distal end of each radial frame member 31. It comprises outer peripheral node members 33 and 34 and an outer peripheral frame member 32 connecting the radial frame members 31 and 31 via the outer peripheral node members 33 and 34.
[0033]
In the following, the outer peripheral node member 33 is referred to as an “outer peripheral hub 33”, and the outer peripheral node member 34 is referred to as an “outer peripheral eyeglass hub 34”. Further, in the present embodiment, the outer peripheral hub 33 is connected to the radial frame member 31 located on the back side (the right side in FIG. 5) of each stage, and the outer peripheral eyeglass hub 34 is connected to the radial frame member 31 located on the near side. However, they may be arranged in the reverse of the illustrated case.
[0034]
The radial frame member 31 is formed by processing a hollow extruded member made of aluminum alloy having a circular cross section, and has flat connection end portions 31a at both ends as shown in FIGS. 9 (a) and 9 (b). ing. Further, at the tip of the connection end 31a, irregularities are formed in a direction orthogonal to the axis of the radial frame member 31.
The connection end portion 31a is formed by crushing both ends of the hollow extruded profile by press working or the like. The connection end 31a is formed in a flat shape that is long in the axial direction (vertical direction) of the outer peripheral hub 33 and the outer glasses hub 34 (see FIG. 8B). A joint structure that is strong in strength against an external force in the axial direction (vertical direction) is formed.
[0035]
The outer peripheral frame member 32 is formed by processing a hollow extruded member made of an aluminum alloy having a circular cross section, similarly to the radial frame member 31, and has flat connection end portions 32a at both ends (FIG. 9). reference). The other configuration is the same as that of the radial frame member 31, so that the detailed description is omitted.
[0036]
As shown in FIG. 8, the outer peripheral hub 33 is formed in a cylindrical shape, and a plurality of connecting grooves 33a are formed on the outer surface thereof along the axial direction (vertical direction) of the outer peripheral hub 33. At the center of the outer peripheral hub 33, a connection insertion hole 33b is formed along the axial direction (vertical direction).
As shown in FIG. 10A, the connection groove 33a is formed in a shape that allows the connection end 31a of the radial frame member 31 and the connection end 32a of the outer peripheral frame member 32 to be fitted. Irregularities that engage with the irregularities of the connection end 31a (32a) are formed. In the present embodiment, three connection grooves 33a are formed at intervals of 75 degrees.
The outer peripheral hub 33 is made of an extruded member made of an aluminum alloy, and the connecting groove 33a is formed when the aluminum alloy is extruded.
[0037]
When connecting the radial frame member 31 to the outer peripheral hub 33, as shown in FIG. 8B, the connecting end 31a of the radial frame member 31 is connected to the connecting groove 33a from the upper surface side (or lower surface side) of the outer peripheral hub 33. It is only necessary to fit (insert) into. Then, as shown in FIG. 10A, the unevenness formed on each of the connection groove 33a and the connection end 31a is engaged with each other, so that the radial frame member 31 is not pulled out in the axial direction. The same applies when the outer peripheral frame member 32 is connected to the outer peripheral hub 33.
As shown in FIG. 8, a groove filling member 39 having the same size and shape as the connection groove 33a is provided to the connection groove 33a to which neither the radial frame member 31 nor the outer peripheral frame member 32 is connected. Fit (insert). Alternatively, an outer peripheral hub (not shown) in which a connecting groove 33a is formed only at a portion where the radial frame member 31 and the outer peripheral frame member 32 are connected may be used.
In addition, if the connection groove is formed as in the present embodiment, it can be used as it is for a spiral stair in the opposite direction (clockwise) to the present embodiment.
[0038]
The outer peripheral eyeglass hub 34 is made of an extruded shape member made of an aluminum alloy, and has a connecting insertion hole 34b and a handrail insertion hole 34c formed along the axial direction (vertical direction) as shown in FIG. 8A. . A plurality of connection grooves 34a are formed on the outer surface of the outer glasses hub 34 and around the connection insertion holes 34b along the axial direction (up and down direction) of the outer glasses hub 34. The configuration of the connection groove 34a is the same as that of the connection groove 33a of the outer peripheral hub 33 described above, and a detailed description thereof will be omitted.
[0039]
When connecting the radial frame material 31 to the outer peripheral eyeglass hub 34, the connection end 31a of the radial frame material 31 may be fitted into the connection groove 34a from the upper surface side (or the lower surface side) of the outer peripheral hub 34. Then, as shown in FIG. 10B, the unevenness formed on each of the connection groove 34a and the connection end 31a is engaged with each other, so that the radial frame member 31 is not pulled out in the axial direction. The same applies when the outer peripheral frame member 32 is connected to the outer peripheral eyeglass hub 34.
[0040]
As shown in FIGS. 2 and 5, a fixing ring 36 having the same thickness as the tread plate mounting plate 14 of the center support 10 is attached to the upper surfaces of the outer peripheral hub 33 and the outer eyeglass hub 34. An outer peripheral spacer 35 is interposed between the tread plate 20 and the tread plate 20. A lower fixing ring 37 is attached to the lower surface of the outer peripheral hub 33 to prevent the radial frame member 31 and the outer peripheral frame member 32 from being pulled out in a downward direction. Although not shown, the outer peripheral eyeglass hub 34 may be made longer and the outer peripheral spacer 35 may be omitted.
[0041]
As shown in FIGS. 2 to 5, the support members 30, 30 adjacent in the height direction are connected by bolts B <b> 1 inserted from the upper surface of the upper tread plate 20 to the outer peripheral hub 33 of the lower support member 30. ing.
[0042]
(handrail)
The handrail 40 is made of a bar made of wood, metal, or the like. The shape, size, length, and the like of the cross section can be appropriately set according to the configuration of the spiral staircase. In the present embodiment, as shown in FIG. 11, a hollow member having a substantially semicircular cross section is formed and fixed to the handrail support 41 via the handrail mounting bracket 42.
[0043]
The handrail support 41 is made of a hollow extruded member made of an aluminum alloy having a circular cross section, and has screw holes 41a and 41b formed at upper and lower ends as shown in FIG.
[0044]
As shown in FIG. 11, the handrail mounting bracket 42 is formed by bending an aluminum alloy plate, has mounting surfaces 42b, 42b inclined at a stepwise slope at both ends, and has a bolt insertion hole 42a at the center. ing.
[0045]
(Construction procedure of spiral stairs)
Next, a procedure for constructing a spiral staircase according to the present invention will be described with reference to the accompanying drawings.
[0046]
First, the core column 11 (see FIG. 4) of the center column 10 is erected on the concrete slab G, and the lower center spacer 13A is extrapolated from above. Next, the first stage D1 to the twelfth stage D12 are sequentially constructed. Since the construction procedure of each stage is the same, as an example, the tenth stage D10 is constructed on the ninth stage D9 shown in FIG. The case in which this is performed will be described with reference to FIG. In the following, members constituting the tenth stage D10 are shown unless otherwise specified.
In addition, when installing a spiral staircase on two or more floors, the core pillar 11 is erected on the floor slab.
[0047]
As shown in FIG. 5, the center hub 12 to which the center spacer 13, the fixing plate 15, and the support member 30 are attached is sequentially inserted into the core column 11. Although not shown, the center spacer 13 is mounted on the tread plate mounting plate 14 of the ninth step D9 shown in FIG.
[0048]
At this time, since the outer periphery of the core pillar 11 and the inner periphery of the center hub 12 each have a regular polygonal cross section, the center hub 12 does not rotate in the circumferential direction. That is, by simply extrapolating the center hub 12 to the core pillar 11, the center hub 12 is positioned, and the direction of the connection groove 12a is accurately determined. In the present embodiment, since the outer periphery of the core pillar 11 and the inner periphery of the center hub 12 are regular dodecagons, the direction of the connection groove 12a of the center hub 12 can be adjusted in steps of 30 degrees.
[0049]
Further, the center hub 12 is externally inserted so that the connection groove 12a thereof is shifted from the connection groove 12a of the center hub 12 at the ninth stage D9 by a predetermined angle (30 degrees in the present embodiment). Therefore, the radial frame member 31 located on the front side of the support member 30 projects in the same direction as the radial frame member 31 located on the back side of the support member 30 at the ninth stage D9 in plan view.
[0050]
Here, as shown in FIG. 8A, the support member 30 is formed of the radial frame members 31 located on the inner side (the right side in FIG. 8A) of the two radial frame members 31, 31. The connection end portion 31a on the distal end side is fitted (inserted) into the connection groove 33a of the outer peripheral hub 33, and the connection end portion 31a on the distal end side of the radial frame member 31 located on the front side is connected to the connection groove 34a of the outer peripheral eyeglass hub 34. The connection ends 32a, 32a of the outer frame member 32 are fitted into the connection grooves 33a, 34a of the outer hub 33 and the outer eyeglass hub 34, respectively. Therefore, no special tool or welding is required when assembling the support member 30.
[0051]
The support member 30 is fixed to the center column 10 by fitting the connection end 31a on the base end side of each radial frame member 31 into the connection groove 12a of the center hub 12.
[0052]
Next, as shown in FIG. 5, the tread plate mounting plate 14 is externally inserted into the core column 11 such that the mounting portion 14 a is located above the connection groove 12 a of the central hub 12. The fixing ring 36 is placed on the upper surface of the outer peripheral hub 33 and the upper surface of the outer peripheral eyeglass hub 34, respectively.
[0053]
Next, the tread plate 20 is placed on the upper surface of the mounting portion 14 a of the tread plate mounting plate 14 and the upper surfaces of the fixing rings 36, 36, and the outer peripheral spacer 35 is provided on the lower surface of the outer peripheral eyeglass hub 34.
[0054]
Then, the bolt B1 is inserted from above the tread plate 20 into the through holes of the fixing ring 36, the outer eyeglass hub 34, the outer spacer 35, the tread plate 20 of the ninth step D9, the fixing ring 36, the outer hub 33 and the lower fixing ring 37, The ninth-stage D9 support member 30 and the tenth-stage D10 support member 30 are connected.
[0055]
When the support members 30 adjacent to each other in the height direction are connected to each other in this manner, for example, in the case of FIGS. 3 and 4, the load acting on the tread plate 20 of the seventh step D7 is equal to the support of the eighth step D8. The member 30 and the support member 30 of the sixth stage D6 are also dispersed, that is, the load acting on the tread plate 20 of the seventh stage D7 is not only resisted by the support member 30 of the seventh stage D7, but is moved up and down. Therefore, the support member 30 can be made lighter as a result.
[0056]
As shown in FIG. 5, the tread plate 20 is fixed at its distal end to the outer peripheral hub 33 and the outer spectacles hub 34 by bolts B1, and is fixed at its proximal end to the tread plate mounting plate 14 by bolts B1 '.
[0057]
Next, as shown in FIG. 5, a screw rod B2 is attached to the screw hole 41a of the handrail support 41, and the screw rod B2 is inserted into the handrail insertion hole 34c of the outer peripheral eyeglass hub 34. Then, the screw rod B2 protruding from the lower surface of the outer spectacle hub 34 is screwed into the screw hole 38a (see FIG. 12) of the cap nut 38, and the handrail support 41 is fixed to the outer spectacle hub 34.
As described above, since the outer peripheral eyeglass hub 34 includes the handrail insertion hole 34c for attaching the handrail support 41, the handrail support 41 can be easily attached.
[0058]
Finally, as shown in FIG. 11, a handrail mounting bracket 42 is attached to the upper end of the handrail support 41, the lower surface of the handrail 40 is brought into contact with the mounting surface 42b of the handrail mounting bracket 42, and is fixed with a bolt B4. As shown in FIG. 12, a notch 40a provided on the lower surface of the handrail 40 prevents the head of the bolt B4 from contacting the lower surface of the handrail 40.
[0059]
As described above, according to the spiral staircase according to the present embodiment, since the support member 30 for supporting the tread plate 20 is constituted by the radial frame member 31 and the outer peripheral frame member 32, the spiral staircase is light and open. That is, even if the spiral staircase according to the present embodiment is constructed in a room, since it is light, a bright living room space without a feeling of oppression can be created.
[0060]
Further, when adjusting the rising height and the installation height of each step, it is only necessary to change the height dimensions of the center spacer 13 extrapolated to the core column 11 and the outer peripheral spacer 35 attached to the lower surface of the outer peripheral eyeglass hub 34. Alternatively, a height adjusting spacer (not shown) may be extrapolated to the core column 11. In any case, it is possible to easily cope with the setting conditions of the spiral stairs (the number of steps, the height of rise, etc.) which differ for each building, and it is easy to make fine adjustments at the construction site. That is, even if the installation conditions of the spiral stairs are different, the center hub 12, the radial frame member 31, the outer peripheral frame member 32, the outer peripheral hub 33, and the outer peripheral eyeglass hub 34 are commonly used without changing their dimensions and shapes. Therefore, it is suitable for mass production and has good production efficiency.
[0061]
In addition, by making each member constituting the center support 10 and each member constituting the support member 30 made of an aluminum alloy, the advantages of the aluminum alloy, which is lightweight for the strength and hard to corrode, are utilized, and a lighter structure is obtained. A spiral staircase can be built.
[0062]
Note that the construction procedure of the spiral staircase is not limited to the construction procedure described above, and may be appropriately changed according to construction conditions and the like. For example, the support members 30 (radial frames 31, 31) may be connected after the center hub 12 is extrapolated to the core pillar 11, or the tread plate mounting plate 14 and the tread plate 20 may be integrated in advance. Is also good.
[0063]
(Modification 1)
In the above-described embodiment, the outer peripheral shape of the core pillar 11 and the inner peripheral shape of the center hub 12 in the center support column 10 are each a regular polygon. However, the present invention is not limited to this. For example, the center shown in FIG. Like the support column 70, a plurality of engagement pieces 71 a are formed on the outer periphery of the core pillar 71, and the engagement pieces 72 b that engage with the engagement pieces 71 a of the core column 71 are formed on the inner circumference of the center hub 72. May be.
According to the center post 70 having such a configuration, when the center hub 72 is extrapolated to the core post 71, the engaging piece 71a of the core post 71 and the engaging piece 72b of the central hub 72 are engaged. The hub 72 does not rotate in the circumferential direction. That is, the center hub 72 is positioned only by extrapolating the center hub 72 to the core column 71, and the direction of the connection groove 72a is accurately determined.
[0064]
(Modification 2)
In the above-described embodiment, the cross-sectional shapes of the radial frame member 31 and the outer peripheral frame member 32 are each circular. However, the present invention is not limited to this, and the radial frame member 51 (the outer peripheral frame member 52) shown in FIG. As shown, it may be square.
[0065]
Here, the radial frame member 51 (outer peripheral frame member 52) is formed by processing a hollow extruded member made of an aluminum alloy having a square cross section, and has flat ends at both ends as shown in FIGS. It has a connection end 51a in the shape of a circle. Further, at the tip of the connection end 51a, irregularities are formed in a direction perpendicular to the axis of the radial frame member 51.
The connection end portion 51a is formed by crushing both ends of a hollow extruded shape having a rectangular cross section shown in FIG. 14C by press working or the like, and after crushing two opposing sides of the four sides inward. (See FIG. 14 (d)), the remaining two sides are crushed (see FIG. 14 (e)) to form the connection end 51a, so that the height of the connection end 51a is equal to the height of the hollow extruded section. It does not spread beyond its dimensions.
[0066]
When the support member 50 is configured by using the radial frame member 51 and the outer peripheral frame member 52, the tread plate 20 can be placed directly over the entire length of the radial frame member 51, as shown in FIG. In addition, although not shown, the tread plate 20 can be directly placed on the upper surface of the outer peripheral frame member 52, so that bending and deformation of the tread plate 20 can be suppressed.
[0067]
Further, since the tread can be directly mounted on the upper surfaces of the radial frame member 51 and the outer peripheral frame member 52, the tread plate mounting plate 14 and the fixing ring 36 shown in FIG. 5 become unnecessary, and the number of parts can be reduced.
[0068]
【The invention's effect】
According to the spiral staircase of the present invention, the support members adjacent in the height direction are connected, and the load acting on the tread is distributed and applied to the upper and lower support members. As a result, the entire spiral staircase can be made lighter.
[0069]
In addition, by configuring the support member with a frame material, the spiral staircase is given lightness and openness, and therefore, even if the spiral staircase is constructed in the living room, it is possible to create a bright living room space without a feeling of oppression. it can.
[0070]
In addition, because of its light structure, handling during construction is easy, and special tools and welding are not required for assembling, so that the workability is good.
[0071]
Further, even if the height of the spiral stairs and the number of steps are changed, it is possible to cope without changing the size and shape of the central node member (central hub) and the supporting member constituting the central support, thereby improving production efficiency. .
[Brief description of the drawings]
FIG. 1A is a plan view of a spiral staircase according to the present invention, and FIG.
FIG. 2 is an enlarged front view of a spiral staircase according to the present invention.
FIG. 3 is an enlarged side view of a spiral staircase according to the present invention.
FIG. 4 is an enlarged perspective view of a spiral staircase according to the present invention.
FIG. 5 is an exploded perspective view of a spiral staircase according to the present invention.
6 (a) is a cross-sectional view of a center node member, (b) is an enlarged cross-sectional view of (a), (c) is a cross-sectional view of a center spacer, and (d) is a cross-section of a tread plate mounting plate. FIG. 3E is a cross-sectional view of the fixing plate.
FIG. 7 is a plan view of a support member.
8A is an exploded perspective view of a support member, and FIG. 8B is an enlarged perspective view illustrating a method of connecting a radial frame member (outer peripheral frame member) to an outer peripheral node member.
9A is a perspective view of a radial frame member (outer peripheral frame member), and FIG. 9B is a side view of FIG. 9A.
FIG. 10 is a plan view of an outer peripheral node member.
FIG. 11 is an exploded perspective view of a handrail.
FIG. 12 is a side sectional view of the same.
FIG. 13 is a plan view showing another example of the member constituting the central support.
14A is a perspective view showing another example of the radial frame material (outer peripheral frame material), FIG. 14B is a side view of FIG. 14A, and FIGS. 14C and 14D are radial frame materials. It is sectional drawing which shows the processing method of the connection end part of an outer peripheral frame material).
FIG. 15 is an enlarged front view of a case where a support member is configured by the radial frame shown in FIG. 14;
[Explanation of symbols]
10 center support
11 core pillar
12 center hub (center node member)
12a Connecting groove
13 Center spacer
20 treads
30 support members
31 Radial frame material
31a Connection end
32 Outer frame material
33 outer peripheral hub (outer peripheral node member)
33a Connecting groove
34 Outer glasses hub (outer joint member)
34a connecting groove
34b Connection hole
34c Handrail insertion hole
35 Outer circumference spacer
40 Handrail
41 Handrail support

Claims (8)

A central support erected vertically,
In a spiral staircase comprising a plurality of treads spirally arranged around the central support,
The tread is supported by a support member projecting from the central support,
A spiral staircase wherein the support members adjacent in the height direction are connected to each other. The support member connects the radial frame members via two radial frame members projecting radially from the central support, an outer peripheral node member connected to a tip of each of the radial frame members, and the outer peripheral node member. Outer frame material
The radial frame material and the outer peripheral frame material each have connection ends at both ends,
2. The spiral staircase according to claim 1, wherein a connection groove in which the connection end can be fitted is formed on an outer surface of the center support and an outer surface of the outer peripheral node member. 3. The spiral staircase according to claim 2, wherein each of the radial frame member and the outer peripheral frame member has a rectangular cross section. In the outer peripheral node member, two insertion holes are formed along a vertical direction,
Using one of the insertion holes, the upper support member and the lower support member are connected,
The spiral staircase according to claim 2 or 3, wherein a handrail support that supports the handrail is attached using the other insertion hole. The center support is configured by alternately extrapolating a ring-shaped center node member and a center spacer to a core post,
The spiral staircase according to any one of claims 2 to 4, wherein a connection groove in which the connection end portion can be fitted is formed on an outer surface of each of the center node members. The outer periphery of the core pillar is formed in a polygonal cross section,
The spiral staircase according to claim 5, wherein an inner circumference of the center node member is formed in a polygonal cross section corresponding to a shape of an outer circumference of the core pillar. The spiral staircase according to claim 5, wherein engagement pieces that engage with each other are formed on an outer periphery of the core pillar and an inner periphery of the center node member, respectively. The at least one of the center support | pillar, a radial frame material, an outer peripheral frame material, and an outer peripheral node member is an extruded shape material made of aluminum alloy, The Claims 2 thru | or 7 characterized by the above-mentioned. The spiral staircase described.

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