JPH0523088Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a folding chair made of solid paper such as cardboard or board material such as synthetic resin.

BACKGROUND ART AND PROBLEMS TO BE SOLVED Conventional folding chairs are generally made of light metal such as aluminum pipe or wooden, and simple folding chairs made of cardboard or the like have not yet been put to practical use. Therefore, conventional folding chairs are relatively heavy.
It is inconvenient to transport it to and from the place of use, such as a temporary event venue where many people gather, and transportation costs are high, and even if it is rented, the cost is relatively high.

Means for Solving the Problems The present invention was devised in view of the above-mentioned circumstances, and is made of solid paper such as cardboard or a plate material such as synthetic resin, with one side open and the open end facing inward. A rectangular flat bag-like body is formed by folding back the flat bag-like body, and a crease N is formed at the middle part in the left and right width direction on both front and back surfaces or one side of the front plate and rear plate that constitute the flat bag body. Between the upper corner parts C ₁ and C _2, there is a roughly arc-shaped fold P that is mainly curved or straight, and below the fold P, there is a crease P that is closer to the center in the width direction than both the left and right edges of the front plate and the rear plate. The points that intersect with the crease P are the vertices T ₁ and T ₂
The bottom point is near the left and right bottom corners and the midpoint between them.
M-shaped folds Q marked B ₁ , B ₂ , and B ₃ are formed from the apexes T ₁ and T ₂ to the side edges to form folds S, and the open side of the flat bag-like body is grounded. When the upper edge is pressed in this state, the flat bag-like body bulges and deforms due to the above-mentioned folds, and a butt-receiving seat is formed on the upper surface, and the lower outer circumferential surface of the butt-receiving seat is made of a polyhedron mainly consisting of triangles. The gist is that the structure is such that a leg cylinder portion is formed.

Function When the folding chair according to the present invention is stored or transported, it is made into a flat bag-like body in which the front plate and the rear plate are closely overlapped, and when used, the open bottom part is slightly expanded and grounded. By pressing the upper part downward by hand, the flat bag-like body is bent at the creases and deformed to bulge, and the upper surface transforms into a buttocks receptacle resembling an oval that is elongated in the left and right direction. A chair is formed in which the bottom surface is substantially rectangular (diamond-shaped or square) and the outer circumferential surface of the leg tube portion is a polyhedron mainly consisting of triangles.

Embodiment The configuration of the present invention will be described with reference to an embodiment shown in the drawings. a is a substantially rectangular plate made of double-sided cardboard (double corrugated cardboard), which is made by laminating single-sided cardboard boxes 1 and 1, each consisting of one liner 1a and one core 1b, in a sandwich-like pattern with an inner liner 2 in between. (The wavy protrusions of the core 1b are aligned along the longitudinal direction of the plate material a), and the four corners of the plate material a are cut c
has been done. The plate material a is folded back at a folding line (fold line) 3 at the middle portion in the longitudinal direction to form a front plate 4 and a rear plate 5. In addition, glue allowances 6, 6a, 7, 7a are provided on the left and right sides of the front plate 4 and the rear plate 5, and the glue allowances 6, 6a, 7, 7a are provided with folded portions of the front plate 4 and the rear plate 5. A triangular notch 8 is provided, and a cut H is provided near the notch 8.

Reference numerals 9 and 10 are folding margins, and a substantially trapezoidal notch U is provided in the middle of the folding margins 9 and 10. Then, the above-mentioned glue allowances 6, 6a, 7, and 7a are each folded inward and the folded outer surfaces are glued together using, for example, a resin adhesive (product name: Zybinol, etc.), and the folding allowance 9 on the open end side is , 10 are bent inward to form a flat bag-like body A. Note that adhesive allowances (for example, 6 and 7) may be provided only on the left and right sides of the front plate 4 and the rear plate 5 on opposite sides, and the positions of the adhesive allowances (adhesion positions) are on both the left and right sides of the front plate 4 and the rear plate 5. The position is not limited to the illustrated example in which the parts are glued together, and the position can be appropriately selected depending on the cut shape of the plate material. Furthermore, the corrugated board may be single-layered (double-sided corrugated board), and in addition to corrugated board, it is also possible to use board materials that are relatively strong and elastic, such as solid paper, synthetic resin, or tanned leather. You can also glue parts 9 and 10,
In addition to adhesion, wire binding or other appropriate fixing means may also be employed. In short, the rectangular flat bag-like body A with one end open may be formed from a plate material such as solid paper such as cardboard or synthetic resin.

Incidentally, a crease N is previously formed on the inner side surface (back side surface) of the front plate 4 and the rear plate 5 at an intermediate portion in the left-right width direction, respectively.

Similarly, between the left and right upper corner portions C ₁ and C ₂ there is a substantially arc-shaped fold P mainly consisting of a curve or a straight line, and below the fold P there are both left and right edges of the front plate 4 and the rear plate 5. An M-shaped fold with the points that intersect with the crease P closer to the center in the width direction as the apexes T ₁ and T ₂ and the bottom points near the left and right lower corners and the intermediate points thereof as the bottom points B ₁ , B ₂ , and B ₃ Eye Q (Fold line Q is symmetrical about crease N)
However, downwardly inclined folds S (α=75°) are formed from the apexes T ₁ and T ₂ to the side edges.

Symbols W and X are folds provided at the gluing allowances 6, 6a, 7, and 7a and the folding allowance 9, and Y is a fold provided between the vertices _T1 and _T2 . It should be noted that, as shown in the drawing, if the fold line X of the folding portion 9 is formed into a gentle inverted mountain shape when viewed from the front, the open surface (touching surface) will be in a straight line when the chair is in use, and the grounding state will be more stable.

In addition, among the above-mentioned folds, the fold P is illustrated as being mainly a straight line in the drawing, but a part thereof may be curved R as shown by the dotted line in FIG. In addition, the above-mentioned folds N, P, Q, S, etc. can be formed by cutting the plate material by appropriate known means such as pressing using a blade die (forming a concave groove of about 45° will make it easier to break) or perforating. It can be easily applied simultaneously or in a separate process. Furthermore, the surface side of the board material a may be colored in a desired manner or printed with letters, patterns, etc. in advance, or if surface treatments such as vinyl coating are applied, not only the waterproof performance will be greatly improved, but also the board material's Rigidity is further improved. Further, folds similar to those described above may be provided not only on the back side but also on the front side. In particular, when applying surface treatment such as vinyl coating or when using a relatively thick board, it is easier to break if the folds are provided on both the front and back sides.

Now, when using the folding chair configured as described above, as shown in FIG. , the flat bag-like body A is deformed into a surface with the fold line 3 and the fold line P as the front plate 4 and the rear plate 5 gradually expand in the front and rear direction around the fold line 3 as the outer contour line. Hollow ears 1 with diamond-shaped cross sections on both left and right sides in plan view on the upper side.
An octagonal buttock seat 12 similar to an ellipse long in the left-right direction is formed. In addition, when pressing the upper edge, if both left and right sides of the bag-like body A are pushed in the approach direction, the legs open in the front-rear direction, making it easier to expand.

By the way, due to the above-mentioned pressing force, the front plate 4 and the rear plate 5 are pushed apart in the front and back direction at the fold P part, and the buttock seat 12 is opened by the folds Q, N, and S as shown in FIGS. 8 and 9. A leg cylinder portion 13 is formed below, which has a trapezoidal shape that widens toward the end in both side and front views. At this time, the outer circumferential surface of the leg tube part 13 is deformed by the folds N, Q, and S so that both the front and rear sides of the flat bag-like body A are bulged and deformed symmetrically about the folding line 3, and the apexes of the triangle are positioned alternately above and below. A polyhedron mainly consisting of triangles is formed, and the lower end open portion is deformed into a rhombus or square shape, and a chair 14 having a horizontally long buttrest seat 12 on the upper surface is formed.

When this chair 14 is under no load and no one is sitting on it, as shown in FIGS. 8 and 9, the fold line 3 at the center of the buttrest seat 12 rises slightly upward due to the elastic return action of the cardboard. However, when a person sits down, a force F ₁ is applied to the buttock seat 12, causing the vertical folding line 3 to further displace downward and the buttock seat 12 to become even more flat. A force F ₂ is applied in the direction of moving back and forth at the crease P position. Therefore, the front plate 4
The rear plate 5 is gradually expanded and displaced in the front-rear direction. Further, the downward displacement of the folding line 3 and the butt receiving seat 12
Due to the flattening of the hollow ear portion 11 having a diamond-shaped cross section, it gradually collapses and becomes flattened, so that an inward force _F3 is generated on the side surface 13a of the leg cylinder portion below the ear portion 11, and as a result, it initially tilts upward. shaped ears 11
gradually transforms into a horizontal or slightly downward sloping shape.
This means that the load applied to the butt support seat 12 is distributed in multiple directions, and therefore, the weight (load) is not directly transmitted to the leg tube portion 13 as a downward pressing force, resulting in improved strength. This is extremely reasonable. In addition, the leg tube portion 13 is not simply cylindrical or rectangular, but is formed into a polyhedron (octahedron) mainly consisting of triangles, so it has strong strength against vertical compression and twisting, and even though it is made of corrugated cardboard, it is made of double-sided corrugated cardboard. Combined with the fact that it is used, it is possible to obtain sufficient rigidity as a chair.

In addition, at the adhesive part between the front plate 4 and the rear plate 5, the lower end open part, and the folded part, the cut ends of the cardboard (core 1b, liners 1a, 2, etc.) are not exposed to the outside but are hidden inside, so water resistance is improved. Not only is it good, but the appearance can also be maintained well. In the former case, the inner folded piece acts as a reinforcing rib in the vertical direction, and in the latter case, the folded piece prevents the cut end of the board from directly touching the ground, so the cut end will not collapse or be pushed and bent, and it will remain in contact with the ground. is extremely stable. Furthermore, the leg tube portion 13
The maximum protruding part in the front-rear direction is located at the middle part in the left-right width direction, and the outer surface of the leg tube is tilted backward from this part, so that when sitting, the leg tube part 1
3, the freedom of the feet is maintained well without getting in the way, and the softness and warmth unique to cardboard and the appropriate cushioning properties make it comfortable to sit on. It is extremely convenient because it can also be used as a handhold. In addition, the present invention has a simple structure and is lightweight (for example, about 650 g for a flat bag with dimensions of 47 cm x 42 cm), which greatly reduces manufacturing costs.Furthermore, the flat bag A can be stored in a stacked state. Since it can be transported, transportation efficiency can be greatly increased.

In addition, by printing, for example, the sponsor's name on the front or rear side of the leg tube part 13 and distributing it free of charge to attendees and spectators of various event venues, outdoor concerts, in-house sports days, baseball tournaments, etc., it can be used as an advertising medium. Since it can be used effectively as a platform, the advertising effect of the company can be further enhanced. In addition, by attaching the shoulder strap 15 (see Figure 14) to the inner surface of the leg tube 13 in advance, the chair can also be used as a storage bag, making it ideal for outdoor sketching, hiking, camping, fishing, etc. When carrying out work, necessary portable items can be stored inside the bag-like body and carried as a shoulder bag, and it can be quickly changed into a chair to sit on while taking a break or at the site, which is extremely convenient. After use, it can be turned upside down and used as a garbage container, and by using cardboard as the material, it can be easily disposed of by incineration, etc. when not in use.

Effects of the Invention As described above, the present invention forms a rectangular flat bag-like body made of solid paper such as cardboard or plate material such as synthetic resin, with one side open and the open end side folded inward. , A crease N is formed at the middle part in the left and right width direction on both the front and back sides or one side of the front plate and rear plate constituting the flat bag-like body, and the left and right upper corner parts C ₁ and C ₂
A substantially arc-shaped fold P mainly consisting of a curved line or a straight line is placed in between,
Beneath the crease P, the points that intersect with the crease P closer to the center in the width direction than both the left and right edges of the front plate and the rear plate are apexes T ₁ and T ₂ , and the points near the left and right lower end corners and the intermediate point therebetween. M-shaped folds Q with bottom points B ₁ , B ₂ , and B ₃ are formed, and folds S are formed from the apexes T ₁ and T ₂ to the side edges, and the open part of the flat bag-like body is formed. When pressing the top edge with the side grounded,
Due to the above-mentioned folds, the flat bag-like body is deformed to bulge outward, and a buttock seat is formed on the upper surface, and a leg cylinder portion is formed on the lower outer circumferential surface of the buttock seat, which is made of a polyhedron mainly consisting of triangles. Since it is composed of
It has a simple structure and can be manufactured at low cost, and is easy to store and transport.When in use, it can be easily transformed into a chair by simply placing the open side of the flat bag-like body on the ground and pressing it from above with your hand. Moreover, although it is made of solid paper such as cardboard or board material such as synthetic resin, it is strong and has appropriate cushioning properties as a chair, providing good sitting comfort and stability, making it suitable for various event venues and gatherings. It is also suitable as a gift to be distributed to attendees and spectators at in-house baseball tournaments, sports days, etc., and as a carry-on item for sketching competitions, camping, fishing, etc. After use, it can also be used as a garbage container. By using solid paper such as cardboard as the material, it can be easily disposed of by incineration or the like when it is no longer needed. Furthermore, even if the material is made of solid paper such as cardboard, water resistance and rigidity can be further increased by applying a waterproof treatment such as vinyl coating to the surface, and the desired coloring and printing of sponsor names, etc. By applying this, it can be used as an advertising medium for companies, etc., and has extremely useful practical effects such as further enhancing the advertising effect.

[Brief explanation of the drawing]

Figure 1 is a developed view of the chair showing the folds, Figures 2 to 7 show the processing procedure for the flat bag-like body and changes in shape of the bag-like body during use, and Figure 2 shows the front plate and Perspective view showing the folded state of the rear plate, No. 3
The figure is a perspective view of the left and right sides of the front plate and rear plate glued together, Figure 4 is a perspective view of the open end side of the front plate folded inward, and Figure 5 is the upper part of the flat bag-like body. Figure 6 is a front view of the chair, Figure 7 is a perspective view of the chair, Figures 8 and 9 are the effect of force when a load is applied to the buttrest. 10 is a front view and a side view of the chair, respectively, and FIG. 10 is a perspective view of the flat bag-like body before folding the open end side.
1 and 12 are a plan view and a bottom view of the chair, FIG. 13 is a perspective view of the chair in use, and FIG. 14 is a perspective view of an example in which a shoulder strap is attached to the bag-like body. 1... Single-sided cardboard, 1a... Liner, 1b
...Central core, 2...Middle liner, 3...Folding line (crease), 4...Front plate, 5...Rear plate, 6,6
a, 7, 7a...glue allowance, 8...notch part, 9,
10...Folding allowance, 11...Hollow ear part, 12...Butt support seat, 13...Leg tube part, 14...Chair, A...
Flat bag-like body, B ₁ , B ₂ , B ₃ ... bottom point, C ₁ , C ₂ ...
Upper corner, T ₁ , T ₂ ... Vertex, N, P, Q, S,
W, X...Fold line, a...Plate material.

Claims (1)

[Scope of utility model registration request] A rectangular flat bag-like body made of solid paper such as cardboard or a board material such as synthetic resin with one side open and the open end side folded inward, and a front plate constituting the flat bag-like body. and a crease N in the middle part in the left and right width direction on both the front and back surfaces or one side of the rear plate, and a substantially arc-shaped crease P mainly made of a curve or a straight line between the left and right upper corners C ₁ and C ₂ , Beneath the crease P, the points that intersect with the crease P closer to the center in the width direction than the left and right edges of the front plate and the rear plate are the apexes T ₁ and T ₂ , and the points near the lower left and right corners and the midpoint thereof are Bottom point B ₁ , B ₂ , B ₃
The fold Q of the M-shape, _{which is}
A fold S is formed from the side edge to the side edge,
When the upper end edge of the flat bag-like body is pressed with the open side thereof in contact with the ground, the flat bag-like body bulges and deforms due to the above-mentioned folds, and a buttocks receiving seat is formed on the upper surface. A folding chair characterized in that the lower outer circumferential surface of the folding chair is configured such that a leg tube portion is formed of a polyhedron mainly consisting of triangles.