JP2019150438A - Support device and chair - Google Patents

Abstract

To provide a support device that can shorten all leg support length of leg supports comprising a leg part and that can enhance latitude of design for the leg part, and also to provide a chair using this device.SOLUTION: A support device 13 in use for a chair 63 includes: a plurality of support points 2 that are each arranged in accordance with the position of each apex of a virtual regular polygon 20 on a plane; at least one vertical post 3 that is arranged in a vertical direction relative to the virtual regular polygon 20; and a leg part 4 that is structured by connecting a plurality of leg posts 40 of at least five posts or more and that connects between one end of the vertical post on the support points 2 side and the plurality of support points 2. The leg part line segments 5 when the leg part 4 is projected on a plane contain bifurcation 50 that branches into three line segments, and the angles formed by the three line segments in the bifurcation 50 are each made 120 degrees.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a support and a chair.

  Conventionally, five support point portions respectively arranged in accordance with the position of each vertex of a virtual regular pentagon drawn on a plane such as a floor surface, and the center of a circumscribed circle of the virtual regular pentagon (hereinafter referred to as “external center”) A vertical column arranged on a vertical axis passing through the vertical column, and a leg unit made up of five leg columns arranged radially from the lower end of the vertical column toward each supporting point. 2. Description of the Related Art Chairs that are configured to support a seat portion from the lower surface side with a supporting tool having the same are widely known (see Patent Document 1, etc.).

JP2012-070852A

  As described above, in the conventional support, the leg struts generally extend radially from the lower end of the vertical struts, and the total length of the leg struts (hereinafter referred to as “total leg strut length”). ) Tends to be long. When the total leg strut length is increased, the amount of leg strut material used is increased, resulting in an increase in material cost. Moreover, the conventional support has a low degree of freedom in designing the legs. Therefore, a chair to which a conventional support is applied has a limited leg design. In the conventional support described above, the same problem occurs even when the virtual regular pentagon is replaced with a virtual regular tetragon, a virtual regular hexagon, or the like.

  The present invention has been made in view of such a problem, and can reduce the total leg strut length of the leg struts constituting the leg portion, and can improve the design freedom of the leg portion. The present invention also intends to provide a chair using this.

One aspect of the present invention is a plurality of support point portions respectively arranged according to the position of each vertex of a virtual regular polygon on a plane,
At least one vertical column arranged in a direction perpendicular to the virtual regular polygon;
A plurality of leg struts of at least five or more are connected to each other, and have leg portions that connect one end of the vertical strut on the support point side and the plurality of support point portions. ,
The leg line segment when the leg part is projected onto the plane includes a branch part that branches into three line segments, and the angle formed by the three line segments at the branch part is 120 degrees. ing,
On the support.

  Another aspect of the present invention is a chair having the support and a seat having a lower surface connected to the other end of the vertical column in the support.

  In the conventional support, leg posts are arranged radially from the lower end of the vertical support arranged coaxially with the outer center of the virtual regular polygon toward each vertex of the virtual regular polygon. According to the knowledge of two-dimensional geometry, the total leg strut length by such an arrangement is not the shortest. That is, there is much room for shortening the total length of the legs.

  On the other hand, the said support tool which concerns on this invention has the said structure. Specifically, when a leg having each leg strut connected to reach each support point located at each vertex of the virtual regular polygon is projected on a plane, the leg line segment by projection is A branch portion that branches into three line segments is included, and the angle formed by the three line segments in the branch portion (hereinafter, also referred to as “branch angle”) is 120 degrees. Therefore, the above-mentioned support device has a total leg strut length as compared with a conventional support device having leg portions in which leg line segments are arranged radially from the outer center of the virtual regular polygon toward each vertex. Is shortened. In addition, the line segment arrangement that makes the total length of each line segment reaching each vertex of the virtual polygon the shortest is called a Steiner tree, and the angle (branch angle) formed by the three line segments is 120 degrees each. The points are called Fermat points.

  According to the support, the Steiner tree is configured for some of the arrangements constituting the Steiner tree of the virtual regular polygon or the plurality of triangles obtained by dividing the virtual polygon by the outer center and each vertex. Steiner tree, such as an arrangement, or an arrangement that forms a Steiner tree for some of the remaining triangles and a quadrilateral that combines two adjacent triangles divided from the outer polygon and each vertex. It becomes possible to arrange the leg line segments so as to constitute. Therefore, the said support tool can shorten the total leg support | pillar length of the leg support | pillar which comprises a leg part compared with the conventional support tool. Moreover, according to the said support tool, it does not need to be limited to the structure where a leg support | pillar extends radially from the lower end of a vertical support | pillar. Therefore, the said support tool can improve the design freedom of a leg part compared with the conventional support tool.

  The chair has the support. Therefore, the chair can reduce the total leg strut length as compared with a chair using a conventional support, and thus can reduce the material cost by reducing the amount of leg strut material used. . Moreover, since the said chair has a high design freedom of a leg part, it is excellent in design property as a whole. Moreover, according to the said chair, it becomes easy to increase a user's foot space compared with the conventional chair.

It is explanatory drawing which showed the support tool and chair of Embodiment 1 typically. It is explanatory drawing which showed the leg part line segment in the support tool of Embodiment 1. FIG. It is explanatory drawing which showed typically the support tool and chair of the comparative form 1. FIG. It is explanatory drawing which showed the leg part line segment in the support tool of the comparative form 1. It is explanatory drawing which showed the support tool and chair of Embodiment 2 typically. It is explanatory drawing which showed the leg part line segment in the support tool of Embodiment 2. It is explanatory drawing which showed typically the support tool and chair of the comparative form 2. FIG. It is explanatory drawing which showed the leg part line segment in the support tool of the comparative form 2. It is explanatory drawing which showed the support tool and chair of Embodiment 3 typically. It is explanatory drawing which showed the leg part line segment in the support tool of Embodiment 3. It is explanatory drawing which showed typically the support tool and chair of the comparison form 3. FIG. It is explanatory drawing which showed the leg part line segment in the support tool of the comparative form 3. It is explanatory drawing which showed the support tool and chair of Embodiment 4 typically. It is explanatory drawing which showed the leg part line segment in the support tool of Embodiment 4. It is explanatory drawing which showed the support tool and chair of Embodiment 5 typically. It is explanatory drawing which showed the leg part segment in the support tool of Embodiment 5. FIG. 10 is an explanatory diagram showing a drawing example when obtaining the total leg segment length of the leg segment in the support according to the fifth embodiment. FIG. 10 is an explanatory view showing a modified example of leg line segments in the support of Embodiment 5. It is explanatory drawing which showed the leg part line segment in the support tool of Embodiment 6.

(Embodiment 1)
The support and chair of Embodiment 1 will be described with reference to FIGS. 1 and 2. As illustrated in FIGS. 1 and 2, the support 11 of the present embodiment includes a plurality of support points 2, vertical struts 3, and legs 4. This will be described in detail below.

  The plurality of support point portions 2 are respectively arranged in accordance with the positions of the vertices of the virtual regular polygon 20 on the plane. The virtual regular polygon 20 is a regular polygon drawn virtually on a plane. The virtual regular polygon 20 includes an approximated one. The plane on which the virtual regular polygon 20 is drawn has a meaning as an installation surface such as a floor surface for installing the support 11. In the present embodiment, the virtual regular polygon 20 is, specifically, a virtual regular square 201 (virtual square).

  At least one vertical column 3 is arranged in a direction perpendicular to the virtual regular polygon 20. One end of the vertical column 3 is connected to the leg 4 as will be described later, and the other end of the vertical column 3 is configured to be connectable to the upper structure 7. In the present embodiment, one vertical column 3 is arranged on the vertical axis passing through the outer center 200 of the virtual regular square 201.

  The leg portion 4 is configured by connecting at least five or more leg struts 40. In the present embodiment, specifically, the leg portion 4 is configured by connecting five leg struts 40. The leg 4 connects between one end of the vertical support 3 on the support point 2 side and the plurality of support points 2. In the support 11, examples of the material of the vertical column 3 and the leg column 40 include a metal material, a plastic material, and a combination thereof.

  Here, as shown in FIG. 2, the leg line segment 5 when the leg part 4 is projected onto the plane includes a branch part 50 that branches into three line segments. Each angle (branching angle) formed by the line segment is 120 degrees. The leg line segment 5 is drawn by connecting the line segments that fall within the width of the leg column 40 projected onto the plane. In FIG. 2, specifically, the leg line segment 5 is drawn using a center line (thick solid line) that bisects the width of the leg strut 40 projected onto the plane.

  As shown in FIG. 2, the support 11 of the present embodiment has leg segments 5 arranged to form a Steiner tree of a virtual regular square 201. The leg line segment 5 in FIG. 2 specifically includes two branch portions 50 having a branch angle of 120 degrees. The two branch parts 50 are connected by one line segment. From each branch part 50, two line segments extending to two vertices respectively extend. The outer center 200 of the virtual regular square 201 is at the midpoint of the line segment connecting the two branch parts 50. On the other hand, the support 11C of the comparative example 1 shown in FIG. 3 and FIG. 4 includes leg line segments 5C composed of four line segments extending radially from the outer center 200 of the virtual regular square 201 toward each vertex. It has a leg 4C.

  Hereinafter, the total length of each line segment constituting the leg line segment 5 in the support 11 of the first embodiment (hereinafter sometimes referred to as “total leg line segment length”) and the support of the comparative form 1 The total length of each line segment constituting the leg line segment 5C in 11C is compared. This is because the length of the total leg support length can be determined.

2 and 4, the length of one side of the virtual regular square 201 is 1. In this case, the total leg line segment length in the support 11C of the comparative form 1 shown in FIG.
√2 × 2 ≒ 2.828
It becomes. On the other hand, in FIG. 2, the total length of the line segments from the branch part 50 to the vertex is
1/2 × cosec 60 ° × 4 = 1 / √3 × 4≈2.309
It becomes. Moreover, the length of the line segment which connects the branch parts 50 is as follows.
1-1 / 2√3 × 2 ≒ 0.423
It becomes. Therefore, the total leg part segment length in the support 11 of Embodiment 1 shown in FIG.
About 2.732
It becomes.
Therefore, the total leg segment length in the support 11 of Embodiment 1 is the shortest, and is shortened by about 3.4% compared to the total leg segment length in the support 11C of Comparative Embodiment 1. ing.

  According to the support 11 of the present embodiment, the leg line segment 5 can be arranged so as to form a Steiner tree of the virtual regular square 201. Therefore, the support tool 11 of this embodiment can shorten the total leg support length of the leg support 40 which comprises the leg part 4, compared with the support tool 11C of the comparison form 1. FIG. Moreover, according to the support tool 11 of this embodiment, it does not need to be limited to the structure where the leg support 40 extends radially from the lower end of the vertical support 3. Therefore, the support tool 11 of this embodiment can improve the design freedom of the leg part 4 compared with the support tool 11C of the comparative form 1.

  Next, the chair of this embodiment will be described. As shown in FIG. 1, the chair 61 of the present embodiment includes the support tool 11 of the present embodiment, and a seat portion 70 having a lower surface connected to the other end of the vertical column 3 in the support tool 11. Yes. In the present embodiment, specifically, a caster 71 is provided at each support point portion 2 of the support tool 11. A backrest 72 is also provided at one side edge of the seat 70. Although not shown, the chair 61 may be provided with an armrest or the like.

  The chair 61 of this embodiment has the support tool 11 of this embodiment. Therefore, since the chair 61 of this embodiment can aim at shortening of the total leg support | pillar length compared with the chair 61C of the comparison form 1 using the support tool 11C of the comparison form 1, the usage-amount of leg support | pillar material The material cost can be reduced by reducing the amount of the material. Moreover, since the chair 61 of this embodiment has the high design freedom of the leg part 4, it is excellent in design property as a whole. Moreover, according to the chair 61 of this embodiment, compared with the chair 61C of the comparative form 1, a user's foot space can be increased.

(Embodiment 2)
A support and a chair according to the second embodiment will be described with reference to FIGS. 5 and 6. Of the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the above-described embodiments represent the same components as those in the above-described embodiments unless otherwise indicated.

  As illustrated in FIGS. 5 and 6, the support 12 of the present embodiment is different from the support 11 of Embodiment 1 in that the virtual regular polygon 20 is a virtual regular hexagon 202.

  In the present embodiment, specifically, the leg portion 4 is configured by connecting nine leg struts 40. As shown in FIG. 6, the support 12 of the present embodiment has leg segments 5 arranged so as to form a Steiner tree having a virtual regular hexagon 202. Such an arrangement can also be said to be an arrangement in which a Steiner tree is formed for each triangle of each of the six triangles obtained by dividing the virtual regular hexagon 202 by the outer center 200 and each vertex. Specifically, the leg line segment 5 in FIG. 6 includes four branch portions 50 having a branch angle of 120 degrees. The four branch parts 50 are connected by three line segments. One of the four branches 50 is at the outer center 200 of the virtual regular hexagon 202. Two line segments extending to the two apexes extend from the remaining three branch parts 50 that are not on the outer center 200 of the virtual regular hexagon 202 among the four branch parts 50. In the present embodiment, one vertical column 3 is arranged on the vertical axis passing through the outer center 200 of the virtual regular hexagon 202. On the other hand, the support 12C according to the comparative example 2 shown in FIGS. 7 and 8 includes leg line segments 5C composed of six line segments extending radially from the outer center 200 of the virtual regular hexagon 202 toward each vertex. It has a leg 4C.

  Hereinafter, the total leg segment length in the support 12 of the second embodiment and the total leg segment length in the support 12C of the comparative embodiment 2 will be compared.

6 and 8, the length of one side of the virtual regular hexagon 202 is 1. In this case, the total leg line segment length in the support 12C of the comparative form 2 shown in FIG.
1 × 6 = 6
It becomes. On the other hand, in FIG. 6, the length of the line segment from the outer center 200 of the virtual regular hexagon 202 to the branch portion 50 and the length of the line segment from the branch portion 50 to the vertex are all equal.
1/2 × sec30 ° = 1 / √3≈0.577
It becomes.
Therefore, the total leg segment length in the support 12 of Embodiment 2 shown in FIG.
1 / √3 × 9 ≒ 5.196
It becomes.
Therefore, the total leg segment length in the support 12 of the second embodiment is the shortest, and is shortened by about 13.4% compared to the total leg segment length in the support 12C of the comparative embodiment 2. ing.

  According to the support 12 of the present embodiment, the leg line segments 5 can be arranged so as to form a Steiner tree having a virtual regular hexagon 202. Therefore, the support tool 12 of this embodiment can shorten the total leg strut length of the leg strut 40 constituting the leg portion 4 as compared with the support tool 12C of the comparative form 2. Other configurations and operational effects are the same as those of the support 11 of the first embodiment.

  Next, the chair of this embodiment will be described. As FIG. 5 shows, the chair 62 of this embodiment differs from the chair 61 of Embodiment 1 by the point which has the support tool 12 of this embodiment. In addition, the chair 62C of the comparative form 2 is shown by FIG. Other configurations and operational effects are the same as those of the chair 61 of the first embodiment.

(Embodiment 3)
A support and a chair according to Embodiment 3 will be described with reference to FIGS. 9 and 10.

  As illustrated in FIGS. 9 and 10, the support tool 13 of the present embodiment is different from the support tool 11 of Embodiment 1 in that the virtual regular polygon 20 is a virtual regular pentagon 203.

  In the present embodiment, specifically, the leg portion 4 is configured by connecting seven leg struts 40. As shown in FIG. 10, the support 13 of the present embodiment has leg segments 5 arranged so as to constitute a Steiner tree having a virtual regular pentagon 203. Specifically, the leg line segment 5 in FIG. 10 includes three branch portions 50 having a branch angle of 120 degrees. The three branch parts 50 are connected by two line segments. Two line segments extending to two vertices extend from two branch portions 50 at both ends of the three branch portions 50. One line segment extending to one vertex extends from the remaining one of the three branch parts 50. The outer center 200 of the virtual regular pentagon 203 is not on the leg line segment 5. In the present embodiment, one vertical column 3 is arranged on the vertical axis passing through the branch portion 50 where the line segment leading to one vertex and the line segment leading to the two branch portions intersect. On the other hand, the support 13C of the comparative form 3 shown in FIGS. 11 and 12 includes leg line segments 5C including five line segments extending radially from the outer center 200 of the virtual regular pentagon 203 toward each vertex. It has a leg 4C.

  Hereinafter, the total leg part segment length in the support tool 13 of Embodiment 3 and the total leg part segment length in the support tool 13C of Comparative Example 3 will be compared.

10 and 12, the length of one side of the virtual regular pentagon 203 is 1. In this case, the total leg line segment length in the support 13C of the comparative form 3 shown in FIG.
1/2 × cosec 36 ° × 5≈0.851 × 5 = 4.243
It becomes. On the other hand, as shown in FIG. 10, the length of each line segment constituting the leg line segment 5 is assumed to be x, y, z, and w.
xsin42 ° = ysin18 °
From the two equations xcos42 ° + ycos18 ° = 1,
x≈0.357, y≈0.773
It becomes. Also,
From zcos30 ° = 0.5,
z ≒ 0.577
It becomes. Also,
From the equation y + zsin 30 ° + w = cos 54 ° + cos 18 °,
w ≒ 0.478
It becomes.
Therefore, the total leg segment length in the support 13 of Embodiment 3 shown in FIG.
2x + 2y + 2z + w≈3.892
It becomes.
Therefore, the total leg segment length in the support 13 of the third embodiment is the shortest, and is shortened by about 8.5% compared to the total leg segment length in the support 13C of the comparative embodiment 3. ing.

  According to the support 13 of the present embodiment, the leg line segments 5 can be arranged so as to constitute a Steiner tree of the virtual regular pentagon 203. Therefore, the support tool 13 of this embodiment can shorten the total leg strut length of the leg strut 40 constituting the leg portion 4 as compared with the support tool 13C of the comparative form 3. Other configurations and operational effects are the same as those of the support 11 of the first embodiment.

  Next, the chair of this embodiment will be described. As shown in FIG. 9, the chair 63 of the present embodiment is different from the chair 61 of the first embodiment in that the chair 63 of the present embodiment has the support 13. In addition, the chair 63C of the comparative form 3 is shown by FIG.

  In the chair 63 of this embodiment, it can be set as the structure which fixes the seat part 70 to the vertical support | pillar 3 so that rotation is impossible. According to this configuration, when the entire chair 63 is to be rotated, it is carried out by the casters 71 provided at the support point portion 2. Therefore, according to this configuration, even when the vertical column 3 is connected to be shifted from the geometric center of the seat 70, the seat 70 is not rotated around the vertical column 3. This makes it easy to improve the stability of the chair 63 (provided that the center of gravity of the seat 70 is near the geometric center of the seat 70). Other configurations and operational effects are the same as those of the chair 61 of the first embodiment.

(Embodiment 4)
The support and chair of Embodiment 4 are demonstrated using FIG. 13 and FIG.

  As illustrated in FIGS. 13 and 14, the support tool 14 of the present embodiment is different from the support tool 13 of the third embodiment in that the connecting shape of the leg struts 40 constituting the leg part 4 is different from the leg line. The shape of the minute 5 is different from the support 13 of the third embodiment.

  In the present embodiment, specifically, the leg portion 4 is configured by connecting seven leg struts 40. As shown in FIG. 14, the support 14 according to the present embodiment has a Steiner tree for two triangles that are not in contact with each other among five triangles obtained by dividing the virtual regular pentagon 203 by the outer center 200 and each vertex. Leg line segments 5 are arranged so as to be configured. Specifically, the leg line segment 5 in FIG. 14 includes two branch portions 50 having a branch angle of 120 degrees. The two branch parts 50 are connected by two line segments. Two line segments extending from the two branch portions 50 to the two vertices respectively extend. The branching part 50 arranged so as to coincide with the outer center 200 of the virtual regular pentagon 203 does not have a branching angle of 120 degrees. One line segment extending to one vertex extends from the branch part 50. In the present embodiment, one vertical column 3 is arranged on the vertical axis passing through the outer center 200 of the virtual regular pentagon 203. In addition, the support tool of the comparison form with respect to the support tool 14 of this embodiment is the support tool 13C of the comparison form 3 shown in FIG. 11 and FIG.

  Hereinafter, the total leg line segment length in the support tool 14 of Embodiment 4 and the total leg line segment length in the support tool 13C of Comparative Example 3 will be compared.

In FIG. 14, the length of one side of the virtual regular pentagon 203 is 1. And let the length of each line segment which comprises leg part line segment 5 be u and v as shown in FIG.
u = 1/2 × sec30 ° ≈0.577
Solving usin24 ° = vsin36 °,
v = 0.400
Therefore, the total leg segment length in the support 14 of the fourth embodiment shown in FIG.
4u + 2v + 1/2 × cosec 36 ° ≈0.577 × 4 + 0.400 × 2 + 0.851 = 3.959
It becomes.
Therefore, the total leg segment length in the support 14 of the fourth embodiment is not the shortest, but is shortened by about 6.9% compared to the total leg segment length in the support 13C of the comparative embodiment 3. ing.

  According to the support tool 14 of the present embodiment, the leg portions are configured so that a Steiner tree is formed with respect to two triangles that are not in contact with each other among the five triangles obtained by dividing the virtual regular pentagon 203 by the outer center 200 and each vertex. The line segment 5 can be arranged. Therefore, the support tool 14 of this embodiment can shorten the total leg strut length of the leg strut 40 constituting the leg portion 4 as compared with the support tool 13C of the comparative form 3. Other configurations and operational effects are the same as those of the support 13 of the third embodiment.

  In addition, in the support tool 14 of this embodiment, as shown in FIG. 14, the leg line segments 5 are arranged so as to form a Steiner tree with respect to two triangles. The leg line segment 5 can also be arranged so as to form a Steiner tree for one of the five triangles obtained by dividing the virtual regular pentagon 203 by the outer center 200 and each vertex. In this case, the total leg line segment length of the support tool 14 is not the shortest as described above, but is shortened by about 3.5% compared to the total leg line segment length of the support tool 13C of Comparative Example 3. can do. That is, at least one branching section 50 having a branching angle of 120 degrees needs to be present in the support tool 14.

  Next, the chair 64 of this embodiment is demonstrated. As FIG. 13 shows, the chair 64 of this embodiment differs from the chair 63 of Embodiment 3 by the point which has the support tool 14 of this embodiment. The chair 64 of the present embodiment is slightly inferior in the shortening rate of the total leg segment length compared to the chair 63 of the embodiment 3, and the leg segment 5 is not rotationally symmetric. However, the chair 64 of the present embodiment is configured so that the seat portion 70 rotates around the vertical column 3 without fixing the seat 70 to the vertical column 3 in a non-rotatable manner as compared with the chair 63 of the third embodiment. Even if it does, there exists an advantage that the shift | offset | difference of the gravity center of the seat part 70 does not occur easily. Moreover, according to the chair 64 of this embodiment, since the leg part 4 can be comprised by non-rotation symmetry, it becomes possible to obtain the chair which has novel design property resulting from this. Other configurations and operational effects are the same as those of the chair 63 of the third embodiment.

(Embodiment 5)
The support and chair of Embodiment 5 are demonstrated using FIG. 15 and FIG.

  As illustrated in FIGS. 15 and 16, the support tool 15 of the present embodiment is different from the support tool 13 of the third embodiment in that the connecting shape of the leg struts 40 constituting the leg part 4 is different from the leg line. The shape of the minute 5 is different from the support 13 of the third embodiment.

  In the present embodiment, specifically, the leg portion 4 is configured by connecting eight leg struts 40. As shown in FIG. 16, the support tool 15 of this embodiment combines one triangle out of five triangles obtained by dividing the virtual regular pentagon 203 by the outer center 200 and each vertex and two adjacent triangles. The leg line segments 5 are arranged so as to constitute a Steiner tree with respect to one quadrangle formed as described above. The leg line segment 5 in FIG. 16 specifically includes three branch portions 50 having a branch angle of 120 degrees. The three branch parts 50 are connected by three line segments. More specifically, of the two branch parts 50 included in the quadrangle, a line segment connecting the branch part 50 far from the outer core 200 and the branch part 50 closer to the outer core 200, Three branch portions 50 are connected by a line segment connecting the near branch portion 50 and the outer core 200 and a line segment connecting the outer core 200 and one branch portion 50 included in the triangle. Two line segments extending to two vertices extend from two branch portions 50 at both ends of the three branch portions 50. Of the three branch parts 50, the remaining branch part 50 between the branch parts 50 at both ends (that is, the branch part 50 closer to the outer core 200) has one line segment reaching one vertex. It extends. The outer center 200 of the virtual regular pentagon 203 is on a line segment connecting the three branch parts 50. In the present embodiment, one vertical column 3 is arranged on the vertical axis passing through the outer center 200 of the virtual regular pentagon 203. In addition, the support tool of the comparison form with respect to the support tool 15 of this embodiment is the support tool 13C of the comparison form 3 shown in FIGS. 11 and 12 described above.

  Hereinafter, the total leg segment length in the support 15 of the fifth embodiment and the total leg segment length in the support 13C of the comparative embodiment 3 will be compared.

In FIG. 15, the length of one side of the virtual regular pentagon 203 is 1. In addition, as shown in FIG. 17, one quadrilateral formed by connecting two adjacent triangles in the virtual regular pentagon 203 is taken out, and one side of the original virtual regular pentagon 203 is paired with one side of the virtual regular pentagon 203. For the line segment connecting the outer center 200 and the apex, an equilateral triangle having one side is drawn. Further, out of the squares, the vertex formed by two sides of the original virtual pentagon 203 is defined as the origin (0, 0), and the coordinates of the vertex on the right side thereof are defined as (1, 0).
The coordinates of the regular triangle on the left side of FIG. 17 (the side of the original virtual regular pentagon 203 is one side) are (−cos 12 °, sin 12 °) ≈ (−0.978, 0.208). On the other hand, the coordinates of the equilateral triangle on the right side in FIG. .346, 0.777). Using these, if the angle formed with respect to the x-axis of the line connecting the regular triangle on the left and the regular triangle on the right is θ (not shown),
θ = tan ⁻¹ (0.851 sin 66 ° −sin 12 °) / (1 + 0.851 cos 66 ° + cos 12 °) ≈13.77 °
It becomes.
As shown in FIG. 17, the angles of the square parts are α, β, γ, and δ, and the lengths of the line segments constituting the square leg line segment 5 are p, q, r, s, and t. .
α = θ + 12 ° ≈25.77 °, β = 60 ° −α≈34.23 °,
γ = β + 18 ° ≈52.23 °, δ = 60 ° −γ≈7.77 °
It becomes. Also,
psinα = qsinβ
From the two formulas pcos α + q cos β = 1,
p≈0.6495, q≈0.5020
It becomes. Also,
ssinγ = tsinδ
From the two formulas of scosγ + tcosδ = 1/2 × cosec36 ° ≈0.851,
s≈0.1328, t≈0.7764
It becomes. Therefore, in FIG. 17, the coordinates of the left branch 50 are
(Qcos (108 ° -β), qsin (108 ° -β))
≒ (0.1403, 0.4820)
It becomes. on the other hand,
In FIG. 17, the coordinates of the right branch 50 are (1−t cos (54 ° −δ), t sin (54 ° −δ)) ≈ (0.4629, 0.5607).
It becomes. Also,
r = √ {(0.4629−0.1403) ² + (0.5607−0.4820) ² }
≒ 0.3321
It becomes.
According to the above, the total length of the leg segment 5 of the quadrangular portion is
p + q + r + s + t
≒ 0.6495 + 0.5020 + 0.3321 + 0.1328 + 0.7764
= 2.3928
≒ 2.393
It becomes. Then, the length of the total leg segment shown in FIG. 16 combined with the length of the leg segment 5 of the triangular portion is
2.393 + 0.577 × 2 + 0.400≈3.947
It becomes.
Therefore, the total leg segment length in the support 15 of the fifth embodiment is not the shortest, but is shortened by about 7.2% compared to the total leg segment length in the support 13C of the comparative embodiment 3. ing.

  According to the support 15 of the present embodiment, one quadrilateral formed by combining one of five triangles obtained by dividing the virtual regular pentagon 203 by the outer center 200 and each vertex and two adjacent triangles. On the other hand, the leg segment 5 can be arranged to constitute a Steiner tree. Therefore, the support tool 15 of the present embodiment can shorten the total leg strut length of the leg strut 40 constituting the leg portion 4 as compared with the support tool 13C of the comparison form 3. Other configurations and operational effects are the same as those of the support 13 of the third embodiment.

  Note that the leg line segment 5 ′ in the support 15 ′ shown in FIG. 18 is in a mirror image relationship with the leg line segment 5 shown in FIG. 16. Even in the case of having such a leg line segment 5 ′, it is possible to obtain the same effect as that of the present embodiment.

  Next, the chair of this embodiment will be described. As FIG. 15 shows, the chair 65 of this embodiment differs from the chair 63 of Embodiment 3 by the point which has the support tool 15 of this embodiment.

  The chair 65 of the present embodiment is slightly inferior in the shortening rate of the total leg segment length compared to the chair 63 of the embodiment 3, and the leg segment 5 is not line symmetric. However, the chair 65 of the present embodiment is configured so that the seat portion 70 rotates around the vertical column 3 without fixing the seat 70 to the vertical column 3 in a non-rotatable manner as compared with the chair 63 of the third embodiment. Even if it does, there exists an advantage that the shift | offset | difference of the gravity center of the seat part 70 does not occur easily. Moreover, according to the chair 65 of this embodiment, since the leg part 4 can be comprised axisymmetrically, it becomes possible to obtain the chair which has novel design property resulting from this. Other configurations and operational effects are the same as those of the chair 63 of the third embodiment.

(Embodiment 6)
A support and a chair according to Embodiment 6 will be described with reference to FIG.

  In the support 15 of the fifth embodiment described above, the angle formed by the two leg struts 40 extending from one end of the vertical strut 3 to the first branch point 41 is not 180 °. On the other hand, as illustrated in FIG. 19, in the support 16 of this embodiment, the angle formed by the two leg struts 40 extending from one end of the vertical strut 3 to the first branch point 41 is 180 °. It has become. That is, in the support 16 of the present embodiment, the two first branch points 41 arranged so as to sandwich one end of the vertical column 3 are connected to each other by the single linear leg column 40. The part 4 is in a state where there is no bent part 42 at one end part of the vertical column 3.

  However, even with such a configuration, as shown in FIG. 19, the leg segment 5 can be drawn in the same manner as in FIG. That is, in the leg line segment 5 in FIG. 19, the two line segments extending from the outer core 200 to the first branch part 50 are projected onto the plane of the linear leg strut 40 without the bent part 42 described above. It is within the width.

  According to the above configuration, one end of the vertical column 3 is connected to the middle of the leg column 40, but the bent portion 42 is not formed on the leg column 40 to which the vertical column 3 is connected. Therefore, in the support 16 of the present embodiment, even when a load is applied to the seat 70, it is difficult for the leg 4 to be twisted, and the strength of the leg 4 is improved compared to the support 15 of the fifth embodiment. Is advantageous. Depending on the width of the leg strut 40 to which the vertical strut 3 is connected, the support 16 of this embodiment may have a slightly longer total leg segment length than the support 15 of the fifth embodiment. . However, since the support 16 of this embodiment can shorten the total leg segment length sufficiently compared to the support 13C of Comparative Example 3, the total leg support length can be shortened. I can say that. Other configurations and operational effects are the same as those of the support 15 of the fifth embodiment.

  Next, the chair of this embodiment will be described. Although not shown, the chair of the present embodiment is different from the chair 65 of the fifth embodiment in that it has the support 16 of the present embodiment. Other configurations and operational effects are the same as those of the chair 65 of the fifth embodiment.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the chair structure is used as the upper structure to which the other end of the vertical column is connected, but the upper structure is not limited to the seat. Moreover, each structure shown by each embodiment can be combined arbitrarily, respectively.

11 (Actual 1) Support tool 12 (Actual 2) Support tool 13 (Actual 3) Support tool 14 (Actual 4) Support tool 15 (Actual 5) Support tool 16 (Actual 6) Support tool 2 Supporting point portion 20 Virtual regularity Square shape 200 Outer core 3 Vertical support 4 Leg 40 Leg support 41 Branch point 5 Leg segment 50 Branch 61 (act 1) Chair 62 (act 2) Chair 63 (act 3) Chair 64 (act 4) Chair 65 ( Real 5) Chair 70 Seat

Claims (6)

A plurality of supporting point portions respectively arranged in accordance with the positions of the vertices of the virtual regular polygon on the plane;
At least one vertical column arranged in a direction perpendicular to the virtual regular polygon;
A plurality of leg struts of at least five or more are connected to each other, and have leg portions that connect one end of the vertical strut on the support point side and the plurality of support point portions. ,
The leg line segment when the leg part is projected onto the plane includes a branch part that branches into three line segments, and the angle formed by the three line segments at the branch part is 120 degrees. ing,
Support tool.   The support according to claim 1, wherein the virtual regular polygon is a virtual regular quadrangle, a virtual regular pentagon, or a virtual regular hexagon. The virtual regular polygon is a virtual regular pentagon,
The support according to claim 2, wherein the leg line segment includes three branch portions. The three branch parts are connected by two or three line segments,
Two line segments extending from the two branch portions at both ends of the three branch portions to the two vertices respectively extend.
The support according to claim 3, wherein one line segment extending to the one apex extends from the remaining one of the three branches.   The support tool according to claim 4, wherein one end of the vertical support is connected to one leg support, and the bent support is not formed on the leg support to which the vertical support is connected.   A chair comprising: the support device according to any one of claims 1 to 5; and a seat portion having a lower surface connected to the other end of the vertical column in the support device.

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