JP4997530B2 - Three-dimensional structure - Google Patents

Description

  The present invention relates to a three-dimensional structure using a plywood obtained by polymerizing a plurality of single plates.

Conventionally, a method of applying pressure to a plywood made by laminating a plurality of single plates coated with an adhesive using a press, a method of pressing a plywood set on a mold with a large number of vise, and setting on a mold A method of pressing a plywood with a bag filled with pressurized gas or pressurized liquid, etc. to form a three-dimensional structure having bent portions using wood and forming a wooden three-dimensional structure having curved surfaces. It has been considered (see, for example, Patent Document 1).
JP-A-5-24005

  By the way, the wooden board has a lower plasticity required for performing the drawing process or the drawing process than the metal plate, and therefore, the shape that can be formed by the molded plywood is limited. For example, a shell of a back seat integrated chair having a shape in which both sides of the width direction have elbow rest portions that are flat surfaces whose front faces upward, and the surfaces of the elbow rest portions are smoothly continuous with the backrest surface and the seat surface. The part where the backrest surface should be formed projects backward with respect to the elbow rest surface, the part where the seat surface should be formed projects downward with respect to the elbow rest surface, and further projects toward the boundary of the back seat It is necessary to increase the width. In addition, in order to realize such a shell, in the back seat boundary portion, the backrest surface and the seat surface should be smoothly connected while projecting greatly downward and rearward with respect to the elbow rest surface, in other words, the center portion in the width direction. Therefore, it is necessary to mold the concave portion formed in the step so as to be further bent. Thus, unless the veneer is stretched greatly in the width direction in the vicinity of the back seat boundary, and the veneer is extended in the height direction at the boundary between the backrest surface and the seat surface, such a shape is Cannot be realized. However, when the single plate is stretched in this way, particularly in the vicinity of the center of the back seat boundary in the width direction, a large tensile force acts simultaneously on the single plate in the width direction and the height direction, and the single plate is damaged. . That is, in the conventional method for forming a curved plywood, it is very difficult to form a three-dimensional structure having a portion where it is necessary to apply a large tensile force or compressive force by plastically deforming a single plate, such as a shell of a back seat integrated chair. There is a problem that it is difficult. Such a defect is not limited to such a shell of a chair, and when it is realized by processing a single metal plate, a shape having a portion that requires a single plate to be greatly stretched by drawing or the like is formed by a molded plywood. Generally present when trying to achieve.

  The present invention is configured to solve the above-described problem, that is, to realize a three-dimensional structure having a shape that requires a drawing process by a molded plywood.

  That is, the three-dimensional structure according to the present invention is a three-dimensional structure using a plywood obtained by polymerizing a plurality of single plates, and is formed by bending in a range that does not force compression or elongation to the extent that each single plate is broken. A plurality of semi-molded parts are provided, and the semi-molded parts are joined by butting the end surfaces of the small ends.

  If configured in this way, each single plate is broken at a place where processing that requires compression or elongation to the extent that each single plate is broken, that is, where the single plate is required to be plastically deformed. A three-dimensional structure having such a portion by plywood, which is divided into shapes that can be formed only by curve forming that does not require plastic deformation to a single plate, in a range that does not require compression or elongation to a degree that causes Can be formed. That is, a semi-molded part made of a molded plywood is molded by a method such as crimping a plurality of single plates pre-applied with an adhesive using a mold having the shape described above, and the semi-molded part thus molded is A three-dimensional structure having a shape that requires drawing when a metal plate is formed can be realized by plywood without greatly stretching or compressing the single plate by the process of joining the end faces together. . In the present invention, the number of semi-molded parts is not necessarily two, and may be three or more.

  As an example of a specific aspect of such a three-dimensional structure, each of the semi-molded parts may be composed of only a flat portion and a protrusion or recess having a shape extending only in one direction. This is because it is possible to eliminate a portion where it is necessary to greatly extend the single plate in order to further bend the protrusion or the concave portion.

  Further, as the simplest example of such a three-dimensional structure, there can be mentioned one obtained by joining two semi-molded parts having substantially the same shape with their end surfaces facing each other.

  On the other hand, as a three-dimensional structure that can be easily formed by such a configuration, one of the half-molded parts is a member to be a seat shell of the chair, and the other one of the half-molded parts is to be a back shell of the chair. What is a member is mentioned. If it is such, about the single plate which should form each semi-molded part, the recessed part of substantially the same shape in the location which should form a seat surface or a backrest surface in the width direction center part of one side edge This is because the shell of the back seat integrated chair can be formed by joining the two semi-molded parts by butting the end surfaces of the small ends.

  In particular, if a gap is provided between a member to be the seat shell of the chair and a member to be the back shell of the chair, a tension covering the outer surface of the three-dimensional structure is provided in the gap. This is because the surplus part of the ground can be pushed in.

  Furthermore, if the center part in the width direction of the member to be the back shell of the chair is arranged behind the center part in the width direction of the edge end surface of the member to be the seat shell of the chair, In use, the end edge of the seat shell is covered with a back shell so that the appearance of the chair is not impaired.

  If the two semi-molded parts have flat portions at both ends in the width direction and the portions where the flat portions are joined to each other are used as the armrests, the sense of unity as the shell of the back seat integrated chair Can be further increased.

  According to the present invention, each single plate is broken at a place where processing is required to force compression or elongation to the extent that each single plate is broken, i.e., where the single plate is required to be plastically deformed. Three-dimensional structure having such a part by plywood divided into shapes that can be formed only by curve forming that does not require excessive compression or elongation, i.e., that does not require significant plastic deformation of a single plate Can be formed. That is, a semi-molded part made of a molded plywood is molded by a method such as crimping a plurality of single plates pre-applied with an adhesive using a mold having the shape described above, and the semi-molded part thus molded is A three-dimensional structure having a shape that requires drawing when a metal plate is formed can be realized by plywood without greatly stretching or compressing the single plate by the process of joining the end faces together. .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 5, the shell structure S which is a three-dimensional structure according to the present embodiment is a wooden structure used as a shell of a wooden backseat-integrated chair, and a seat cushion is provided at the center in the width direction. A seat portion 13 having a seat shell surface 1b that is a surface to be disposed and a backrest portion 23 having a back shell surface 2b that is a surface to be disposed with a back cushion are provided. The seat portion 13 and the backrest portion 23 are concave portions that project downward and rearward toward the center portion in the width direction. On the other hand, the seat shell surface 1b faces substantially vertically upward, the back shell surface 2b faces forward and upward, and a single plate material is curved to form the boundary between the seat 13 and the backrest 23 as a smooth curved surface. In this case, the corresponding portion of the plate member receives a tensile force toward both the left and right sides, above the backrest portion, and forward of the seat portion. Further, when a single plate is molded in this way, it is necessary to perform drawing processing on the corresponding part. Thus, in the present embodiment, as described above, it is formed by abutting and joining the small edge end surfaces of two semi-molded parts that are obtained by dividing the shell structure S at this location, that is, the back seat boundary portion. . Specifically, the seat includes a first semi-molded part having a seat (hereinafter referred to as seat shell 1) and a second semi-molded part having a backrest (hereinafter referred to as back shell 2). The small edge end surface 1a of the shell 1 and the small edge end surface 2a of the back shell 2 are abutted and joined. Both the seat shell 1 and the back shell 2 are made of plywood formed by bending a single plate so as not to force compression or elongation to the extent that each single plate is broken, and by joining a plurality of single plates with an adhesive. belongs to. More specifically, the seat shell 1 and the back shell 2 are curved so that a tensile force acts only in one direction on each part of the single plate. The seat shell 1 and the back shell 2 have substantially the same shape in this embodiment. 1 is a perspective view of the shell structure S, FIG. 3 is a bottom perspective view of the shell structure S, FIG. 3 is a side view of the shell structure S, and FIG. A front view of the shell structure S is shown in FIG. 5, and an exploded perspective view of the shell structure S is shown.

  Specifically, the seat shell 1 has a lower elbow plane portion 11 that is a plane portion that should constitute the lower portion of the elbow rest, and the other portion is a recess that protrudes downward and extends rearward. The concave portion includes a seat portion 13 having a large curvature radius and located at the center in the width direction, and a connection portion 12 that connects the seat portion 13 and the lower elbow plane portion 11 and has a small curvature radius. And the upper surface of the said seat part 13 is made into the seat shell surface 1b which is a surface which should arrange | position a seat cushion. That is, this seat shell 1 consists only of the recessed part (connection part 12 and seat part 13) extended only to one direction, ie, back, and a plane part (lower elbow plane part 11). The seat shell 1 is formed by bending a single plate into the shape described above and joining the single plate thus curved. In addition, since the specific pressurization method in the case of curve shaping | molding and the specific procedure of curve shaping | molding are a well-known thing, description is abbreviate | omitted.

  On the other hand, the back shell 2 is formed as a recess that leaves the upper elbow flat surface portion 21 that is a flat portion that should constitute the upper portion of the elbow rest, and the other portion protrudes rearward and extends downward. The concave portion includes a backrest portion 23 having a large curvature radius and positioned at the center in the width direction, and a connection portion 22 that connects the backrest portion 23 and the upper elbow plane portion 21 and has a small curvature radius. And the front surface of the said backrest part 23 is made into the back shell surface 2b which is a surface which should arrange | position a back cushion. That is, this back shell 2 consists only of the recessed part (connection part 22 and the backrest part 23) extended only to one direction, ie, the downward direction, and a plane part (upper elbow plane part 21). The back shell 2 is formed by bending a single plate into the shape described above and joining the single plate thus curved. In addition, since the specific pressurization method in the case of curve shaping | molding and the specific procedure of curve shaping | molding are a well-known thing, description is abbreviate | omitted.

  As described above, the shell structure S is formed by abutting and joining the small edge end surface 1 a of the seat shell 1 and the small edge end surface 2 a of the back shell 2. Specifically, as shown in FIG. 5, a plurality of dowel holes 1x and 2x are previously opposed to each other in the width direction both ends of the small edge end surface 1a of the seat shell 1 and the small edge end surface 2a of the back shell 2 and in the vicinity thereof. A set of dowels 3 coated with an adhesive is inserted into the dowel holes 1x and 2x for joining. Further, in order to prevent the seat shell 1 and the back shell 2 from separating before the adhesive applied to the dowel 3 is solidified, a U-shaped joint fitting 4 opened downward is straddled over the seat shell 1 and the back shell 2. I try to hit it like this. At that time, the lower elbow plane portion 11 and the upper elbow plane portion 21 are joined so as to be flush with each other. A hinge 5 serving as a reinforcing tool is attached to the seat shell 1 and the back shell 2 in the vicinity of the left and right sides of a gap SP described later formed on the seat shell 1 and the back shell 2. In addition, when a level | step difference arises in the boundary of these lower elbow plane part 11 and upper elbow plane part 21 in the case of joining, it is made to process so that it may become a smooth plane by means, such as a paper file.

  In the present embodiment, as described above, the seat shell 1 and the back shell 2 have substantially the same shape so that both can be molded by a single mold. Thus, when the seat shell 1 and the back shell 2 are molded, when the adhesive is dried and completed as a plywood, the curvature of the plywood constituting them coincides and the end facet of the small edge extends over the entire region in the width direction. There are few cases where 1a and 2a can be completely matched. In the present embodiment, this is reversed so that the shell structure S of the back seat integrated chair is suitably configured as follows. That is, the lower elbow plane portion 11 and the upper elbow plane portion 21 are joined so as to be almost completely flush with each other, and are generated in the portion where the seat shell surface 1b and the back shell surface 2b are formed, that is, in the central portion in the width direction. The gap is set as a gap SP in which the surplus portion of the tension covering the outer surface of the shell structure S can be pushed in as it is. Further, until the joining is performed, it is not specified whether the specific semi-molded part is the seat shell 1 or the back shell 2, and the radius of curvature is determined when the adhesive that bonds the single plates is dried and solidified. A small semi-molded part is determined as the back shell 2. When the back seat shell 1 and the back shell 2 determined in this way are joined, the center portion in the width direction of the back shell 2 is located behind the center portion in the width direction of the small end surface 1a of the seat shell 1, and the back seat integrated type When used as a shell structure S of a chair, the fore end face 1a of the seat shell 1 is concealed from the rear space by the back shell 2. And in the center part of the seat shell surface 1b of the seat shell 1, the female screw hole 1y is formed so that the leg (not shown) of a chair may be attached.

  As described above, the shell structure S according to the present embodiment includes the seat shell 1 and the back shell 2 that are formed by bending in a range that does not force compression or elongation to the extent that each single plate is broken. The seat shell 1 and the back shell 2 are joined by abutting the end surfaces 1a and 2a thereof. The seat shell 1 and the back shell 2 are divided into portions that require plastic deformation in each single plate when the shell structure S is formed from a single plate, that is, the back seat boundary portion, and each single plate is divided. The shape is such that it can be formed only by curve forming, which is possible within a range that does not force compression or elongation to the extent of causing breakage. Then, after each single plate is formed into a curved shape, such single plates are stacked to form the seat shell 1 and the back shell 2, and the seat shell 1 and the back shell 2 thus formed are connected to the end surfaces 1a and 2a. The three-dimensional structure having such a shape that a drawing process is required when forming using a metal plate can be realized by the plywood.

  In addition, each of the seat shell 1 and the back shell 2 is composed of only a flat portion and a concave portion extending in one direction, that is, rearward or downward, so that the concave portion provided by curve molding is bent in another direction. Further, it is not necessary to perform a process of bending and greatly stretching the single plate, and it is possible to eliminate the need to compress and stretch each single plate to the extent that it causes breakage.

  Further, since the seat shell 1 and the back shell 2 having substantially the same shape are joined by butting the end surfaces 1a and 2a, the molds necessary for forming the seat shell 1 and the back shell 2 are used. However, one is sufficient, and the manufacturing process can be simplified.

  In addition, since a gap SP is provided between the seat shell 1 and the back shell 2, an extra portion of the upholstery covering the outer surface of the shell structure S, that is, a chair upholstery, is provided in the gap SP. Can be pushed in.

  Further, since the central portion in the width direction of the back shell 2 is arranged behind the central portion in the width direction of the small edge end surface 1a of the seat shell 1, the small edge end surface 1a of the seat shell 1 is used as a back when used as a chair. It is covered with a shell so that it does not impair the appearance of the chair.

  The two seat shells 1 and the back shell 2 have a lower elbow plane portion and an upper elbow plane portion which are flat portions at both ends in the width direction, respectively, and a portion where the lower elbow plane portion and the upper elbow plane portion are joined. Since it is an elbow rest, the sense of unity as a shell of the back seat integrated chair can be further increased.

  The present invention is not limited to the embodiment described above.

  For example, in the above-described embodiment, two half-molded parts (seat shell and back shell) are joined together to form a three-dimensional structure (shell structure). May be joined to form a three-dimensional structure. As an example in this case, for example, a mode in which the left half part and the right half part of the seat shell and the back shell described above are formed as separate semi-molded parts and each is formed by curve molding is conceivable.

  Also, it is not necessary for the two semi-molded parts to have the same shape. For example, you may make it form the shell of the back seat integrated chair with the height dimension of a backrest surface larger than the depth dimension of a seat surface by the method similar to embodiment mentioned above.

  In addition, the semi-molded part need not be a part of the shell structure of the back seat integrated chair.

  On the other hand, when using as a shell structure of a back seat integrated chair, when adopting a design that does not cover the outer surface with upholstery, adopt a mode in which no gap is provided between the back shell and the seat shell. Of course it is good.

  And it replaces with the elbow pad part in embodiment mentioned above, and you may form the elbow pad part which has the shape which protruded upwards while it has the inclination which goes to the left-right both ends, and goes below.

  In addition, various modifications can be made without departing from the spirit of the present invention.

The perspective view which shows the shell structure which concerns on one Embodiment of this invention. The bottom perspective view showing the shell structure concerning the embodiment. The side view which shows the shell structure which concerns on the same embodiment. The front view which shows the shell structure which concerns on the same embodiment. The disassembled perspective view which shows the shell structure which concerns on the same embodiment.

Explanation of symbols

S ... Shell structure 1 ... Seat shell (semi-molded part)
11 ... Lower elbow plane 13 ... Seat 2 ... Back shell (semi-molded part)
21 ... Upper elbow plane 23 ... Backrest

Claims (7)

It is a three-dimensional structure using a plywood made by polymerizing a plurality of single plates, and a plurality of semi-molded parts formed by bending in a range that does not force compression or elongation to the extent that each single plate is broken. A three-dimensional structure characterized in that the semi-molded parts are joined by butting the end edges of the small ends. The three-dimensional structure according to claim 1, wherein each of the semi-molded parts is composed of only a flat portion and a protrusion or recess having a shape extending only in one direction. The three-dimensional structure according to claim 1 or 2, wherein two semi-molded parts having substantially the same shape are joined with their end surfaces facing each other. 4. A three-dimensional object according to claim 2, wherein one of the half-molded parts is a member to be a seat shell of a chair, and the other one of the half-molded parts is a member to be a back shell of the chair. Structure. 5. The three-dimensional structure according to claim 4, wherein a gap is provided between a member to be a seat shell of the chair and a member to be a back shell of the chair. 6. The center part in the width direction of the member to be the back shell of the chair is arranged behind the center part in the width direction of the edge surface of the edge of the member to be the seat shell of the chair. The three-dimensional structure described. The three-dimensional structure according to claim 4, 5 or 6, wherein the two semi-molded parts have flat portions at both ends in the width direction, and a portion where the flat portions are joined to each other is an elbow rest.

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