JP2024006501A - Frame body and furniture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance flexure rigidity of a plate body, in regard to a frame body having a structure with the plate body supported by a paper tube, by making an end part of the plate body inserted into the paper tube through a slit formed in the paper tube.

SOLUTION: A frame body by the present disclosure includes: a plurality of paper tubes; and a plurality of joints connecting a plurality of paper tubes so that a plurality of polygonal continuous sides is structured by the plurality of paper tubes. At least two respective paper tubes of the plurality of the paper tubes are provided with a slit which extends along a shaft and which penetrates inside and outside of a wall body. The frame body is further provided with a plate body which is supported at least by two paper tubes by inserting the end part into the at least two paper tubes so that the slit provided by at least each of the two paper tubes is penetrated. In addition, the plate body is provided with a plate body main body having a principal surface and with a rib. The rib, in the end part inserted into at least one paper tube of at least the two paper tubes, protrudes from the principal surface of the plate body main body and extends in a shaft direction of the inserted paper tube.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a frame using a paper tube, and furniture such as a wagon and a chair using the frame.

"Paper tube" is a tube made of paper that can be used to "roll," "enclose," and "support" things such as toilet paper cores, duct tape cores, award certificate storage tubes, and cardboard pallets. There are various uses centered on three functions (see Non-Patent Documents 1 and 2). Since paper tubes are made of paper, they are lightweight, can be returned to soil after disposal, and have the advantage of being environmentally friendly.

BACKGROUND ART Furniture such as shelves and racks in which paper tubes are used for supports, cross beams, etc., have been known as disclosed in Patent Documents 1 and 2, for example. In order to arrange the top plates, shelves, etc. in this type of furniture, it is best to place the plates on top of the supports, sandwich them between the upper and lower supports, or place them on the cross beams. It was customary.

In contrast, the present inventor has created a frame structure that improves the aesthetic appearance and stably supports the plate by forming a slit in the paper tube and inserting the plate into the paper tube through the slit. is disclosed (Patent Document 3). The frame can be a component of furniture. However, when a relatively heavy object is placed on the plate or a person sits on it, the plate sometimes bends, and an improvement to increase the bending rigidity of the plate has been desired.

Japanese Patent Application Publication No. 09-168435 Publication No. 60-134908 Patent No. 7038454

Nippon Paper Industry Co., Ltd.’s web page “Knowledge of paper tubes” (https://www.nskg.co.jp/product/tube_chisiki.html) Nippon Shikan Kogyo Co., Ltd.'s web page "About paper core" (http://n-shikan.co.jp/paper-core/)

In view of the above problems, the present invention provides a frame body having a structure in which a plate body is supported by a paper tube by inserting the end portion of the plate body into the paper tube through a slit formed in the paper tube, and the frame body. The purpose is to increase the bending rigidity of the board for furniture that uses the body.

In order to achieve the above object, a first aspect of the present invention includes a frame including a plurality of paper tubes, and the plurality of paper tubes forming a plurality of continuous sides of a polygon. and a plurality of joints for connecting the plurality of paper tubes. Each of at least two paper tubes among the plurality of paper tubes has a slit extending along the axis and penetrating the wall inside and outside. The frame body is a plate body supported by the at least two paper tubes by having an end inserted into the at least two paper tubes so as to pass through the slits each of the at least two paper tubes has. It also has the following. Further, the plate has a plate main body having a main surface and a rib. The rib protrudes from the main surface of the plate main body at the end inserted into at least one of the at least two paper tubes, and extends in the axial direction of the inserted paper tube. Exists.

According to this configuration, a paper tube is used for the beam portion of the frame, and the frame is supported by inserting the plate into the paper tube. Such frames can be used as racks, shelves, chairs, and other components of various furniture. Since the end of the plate inserted into at least one of the paper tubes supporting the plate has a rib that protrudes from the main surface of the plate body and extends in the axial direction of the inserted paper tube, The bending rigidity of the plate is increased. Furthermore, since the ribs are inside the paper tube, the beauty of the frame is not impaired.

A second aspect of the present invention is the frame body according to the first aspect, in which the at least one paper tube has the slit extending to at least one of both ends in the axial direction. Further, the thickness of the end portion of the plate body including the plate main body and the ribs in the direction perpendicular to the main surface is the thickness of the end portion of the plate body including the plate body and the ribs in the direction perpendicular to the main surface. It is larger than the width of the slit in the paper tube.

According to this configuration, the thickness of the plate body including the plate body and the ribs in the direction perpendicular to the main surface is the width of the slit of the paper tube into which the end of the plate body where the ribs extend is inserted. The bending rigidity of the plate can be increased by setting the thickness of the end of the plate to be large while keeping the width of the slit small. Further, even if there is no other structure that prevents the end of the plate from coming out of the paper tube, the rib prevents the end of the plate where the rib extends from coming out of the paper tube. The slit of the paper tube in which the rib is located extends to at least one of the two axial ends of the paper tube, so the end of the plate including the rib is inserted into the paper tube from at least one end. can do.

A third aspect of the present invention is the frame body according to the first or second aspect, wherein the plurality of paper tubes are four paper tubes, and the plurality of joints are four joints. , the polygon is a rectangle, the at least two paper tubes are the four paper tubes, and the at least one paper tube is two paper tubes located at positions facing each other.

According to this configuration, since the plurality of paper tubes are four and constitute the four sides of a rectangle, it is particularly convenient for application to racks, shelves, chairs, and other components of various assemblies. Since the plate is supported by the four paper tubes forming the four sides of the rectangle, the plate is more firmly supported. Since there are ribs at the ends of the plate inserted into the two paper tubes located at mutually opposing positions, the bending rigidity of the plate is effectively increased.

According to a fourth aspect of the present invention, there is provided a frame body according to the third aspect, in which the plate main body extends in the axial direction of the two paper tubes located at positions facing each other. It has four grooves that are open at both ends and extend along the axial direction. The four grooves are locked to the four joints or the walls of the two paper tubes by receiving insertion of the four joints or the walls of the two paper tubes. As a result, movement of the inserted plate in the direction in which the end portions of the inserted plate come out from the two paper tubes located at positions facing each other is restrained.

According to this configuration, the four grooves formed in the plate main body are engaged with the four joints or the walls of the two paper tubes, so that the two paper tubes at positions facing each other are The movement of the plate body in the direction in which the end portion of the plate body inserted into the paper tube comes out from these paper tubes is restrained.

A fifth aspect of the present invention is a frame body according to any one of the first to fourth aspects, wherein the rib has a hook-shaped portion. Further, the plate main body has a through hole that is formed to penetrate the main surface and receives the hook-shaped portion. Furthermore, in the rib, the hook-shaped portion is inserted into the through-hole, and the rib further slides in the extending direction of the rib, so that the hook-shaped portion engages with an edge of the through-hole, Thereby, it is supported by the plate main body so as not to be separated from the plate main body.

According to this configuration, there is no need to manufacture the plate main body and the rib as an integral member, so manufacturing costs can be reduced.

A sixth aspect of the present invention is a frame body according to the fifth aspect, in which the rib is plate-shaped.
According to this configuration, since the ribs are plate-shaped, manufacturing costs can be further reduced.

A seventh aspect of the present invention is the frame body according to the sixth aspect, further comprising a release paper interposed in at least a portion of the contact portion between the rib and the plate main body.

According to this configuration, frictional noise when a load is applied to the plate main body is reduced or eliminated. The release paper is applied as a protective sheet during the manufacturing process by leaving part of the release paper on the main surface of the plate body or on the main surface of the plate-shaped rib, so that it can be applied to the contact area between the rib and the plate body. can be intervened.

According to an eighth aspect of the present invention, there is provided a frame according to any one of the first to seventh aspects, wherein the plurality of paper tubes and the plurality of joints are connected to each other. Each of the connecting portions has wedge insertion holes provided so as to overlap with each other. A wedge cut out from a paper tube is fitted into the wedge insertion hole, thereby connecting the plurality of paper tubes and the plurality of joints while preventing them from separating from each other.

According to this configuration, a wedge cut out from the paper tube is used to maintain the connection between the paper tube and the joint, so the manufacturing cost for maintaining the connection between the paper tube and the joint is reduced. Saved.

A ninth aspect of the present invention is furniture, which includes a frame according to any one of the first to eighth aspects.
According to this configuration, the bending rigidity of the plate forming the furniture is increased.

As described above, according to the present invention, there is provided a frame body having a structure in which the plate body is supported by the paper tube by inserting the end portion of the plate body into the paper tube through a slit formed in the paper tube, and the frame body. Regarding furniture that uses the body, the bending composition of the board is enhanced.

1 is a photograph illustrating the appearance of furniture according to an embodiment of the present invention. FIG. 1 is a plan view illustrating the configuration of a frame according to an embodiment of the present invention. 3 is a perspective view illustrating the configuration of a paper tube used in the frame of FIG. 2. FIG. 3 is a perspective view illustrating the configuration of a plate used in the frame shown in FIG. 2. FIG. FIG. 5 is an end view of a cut portion of the plate shown in FIG. 4 illustrating the shape of the cut end surface along a rib. FIG. 3 is a plan sectional view showing an example of the internal structure near the joint of the frame shown in FIG. 2; 3 is a vertical sectional view showing an example of a plate end portion having a rib and a paper tube that receives the plate end portion of the frame shown in FIG. 2. FIG. 3 is a vertical sectional view showing another example of a plate end portion having a rib and a paper tube that receives the plate end portion of the frame shown in FIG. 2. FIG. A vertical cross-section illustrating a cross-section along a different cutting plane from the vertical cross-sectional view of FIG. 8 regarding the plate end portion having ribs and the paper tube that receives the plate end portion of the frame body of FIG. 2 It is a diagram. FIG. 3 is a plan sectional view showing another example of the internal structure near the joint of the frame shown in FIG. 2; FIG. 7 is a plan sectional view illustrating an internal structure near a joint of a frame according to another embodiment of the present invention. FIG. 3 is a perspective view showing another example of the configuration of a paper tube. FIG. 7 is a plan sectional view illustrating an internal structure near a joint of a frame according to still another embodiment of the present invention. It is a perspective view which shows yet another example about the structure of a paper tube. FIG. 7 is a plan sectional view illustrating an internal structure near a joint of a frame according to still another embodiment of the present invention. FIG. 2 is a perspective view illustrating the configuration of a paper tube composite. FIG. 7 is a plan sectional view illustrating an internal structure near a joint of a frame according to still another embodiment of the present invention. FIG. 7 is a plan view illustrating the configuration of a frame according to still another embodiment of the present invention. It is a photograph illustrating the appearance of furniture according to another embodiment of the present invention.

FIG. 1 is a photograph illustrating the appearance of furniture according to an embodiment of the present invention. The illustrated example of furniture 101 is configured as a chair. In the furniture 101, a frame is formed by connecting a number of paper tubes 10 with a number of joints 11. A rectangular frame body is formed by connecting four paper tubes 10 with four joints 11 so as to constitute four continuous sides of a rectangle. The frame of the furniture 101 is constituted by a plurality of frames connected by sharing a paper tube 10 and a joint 11. In the illustrated example, the joint 11 includes a two-way joint that connects two paper tubes 10, a three-way joint that connects three paper tubes 10, and a four-way joint that connects four paper tubes 10. is included. In the illustrated example, the joint 11 is made of synthetic resin, for example. In the illustrated example, the outer surface of the paper tube 10 is coated with a paint that gives it a metallic luster.

A plate body 13 is supported on some of the frames. Of the plates 13, the plate 13A constitutes the back plate of the chair, the plate 13B constitutes the seat plate, and the plate 13C constitutes a placement plate on which articles are placed. The plates 13A, 13B, and 13C are, for example, synthetic resin plates, particularly transparent acrylic plates. Among the plates 13A, 13B, and 13C, the plate 13B that constitutes the seat plate receives the load caused by the user sitting on it. A frame body according to an embodiment of the present invention described below includes a plate body 13B that functions as a seat plate that receives a load, four paper tubes 10 that support the plate body 13B, and connects these four paper tubes 10. It is suitable for a frame composed of four joints 11.

FIG. 2 is a plan view illustrating the configuration of a frame according to an embodiment of the present invention. The illustrated frame 102 has four paper tubes 10 of two types, long and short. The four paper tubes 10 are connected by four joints 11 so as to form four continuous sides of a rectangle. Further, a plate body 13 is supported by the four paper tubes 10. The joint 11 is made of synthetic resin, for example. Further, the plate body 13 is, for example, a synthetic resin plate, particularly a transparent acrylic plate. In the illustrated example, the joint 11 is a two-way joint that connects two paper tubes 10. The frame body 102 can be used alone, but by using a joint 11 that connects three or more paper tubes 10, such as a four-way joint that connects four paper tubes 10, It can be used as a component of various furniture such as the furniture 101 illustrated in FIG.

FIG. 3 is a perspective view illustrating the configuration of the paper tube 10 used in the frame 102. The illustrated paper tube 10 has a slit 3 formed in a cylindrical wall 1 . The slit 3 extends along the axis 5 from one end of the wall 1 to the other end. The shape of the paper tube 10 is a round tube. In the following embodiments as well, an example is shown in which the paper tube 10 has a cylindrical shape, but the shape of the paper tube in the present invention is not limited to the cylindrical shape.

Returning to FIG. 2, the slits 3 of the four paper tubes 10 are oriented to face the inside of the rectangle formed by the four paper tubes 10. The ends 52 and 54 of the plate body 13 pass through the slits 3 of these four paper tubes 10 and reach the insides of the four paper tubes 10. In this way, the plate body 13 is supported by the four paper tubes 10 by inserting the end portions 52 and 54 into the four paper tubes 10.

The width of the slit 3 (the width in the vertical direction in FIG. 3 or the width in the direction perpendicular to the plane of paper in FIG. 2) is set to be the same as the thickness of the plate 13, for example. Alternatively, the width of the slit 3 is set smaller than the thickness of the plate 13, and the ends 52 and 54 of the plate 13 are pushed into the slit 3, so that the plate 13 is fitted into the paper tube 10. good. Thereby, the plate body 13 is stably supported by the paper tube 10. Alternatively, the width of the slit 3 is set larger than the thickness of the plate 13, and the ends 52 and 54 of the plate 13 pass through the slit 3 with play, so that the plate 13 is supported by the paper tube 10. good. In the present disclosure, "piercing through a slit" includes any form unless otherwise specified.

In order to use the frame 102 as a component of furniture 101 or the like, it is desirable that the paper tube 10 forming the frame 102 has a certain degree of rigidity. For example, it is desirable that the paper tube 10 has a thickness of 1.5 mm or more and an inner diameter of 15 mm or more. Further, in order to increase the usefulness as the frame 102, it is desirable that the length of the paper tube 10 is 90 mm or more.

FIG. 4 is a perspective view illustrating the configuration of the plate body 13 used in the frame body 102. The plate 13 has a plate main body 51 and ribs 53. In the illustrated example, both the plate main body 51 and the ribs 53 are plate-shaped with main surfaces. The main surface of the plate main body 51 has a substantially rectangular shape. The rib 53 stands up from the main surface of the plate body 51 in a region of the plate body 51 corresponding to the end portion 52 of the plate body 13 to be inserted into two paper tubes 10 facing each other, and is inserted into the two paper tubes 10 facing each other. It is provided so as to extend in the axial direction of the paper tube 10. The ribs 53 are provided to increase the bending rigidity of the plate body 13. In the present disclosure, regions of the plate body 51 corresponding to the ends 52 and 54 of the plate body 13 are also referred to as the ends 52 and 54 of the plate body 51, respectively, for convenience.

The rib 53 has a hook-shaped portion 55. On the other hand, the plate main body 51 has a through hole 57 at an end portion 52 into which the hook-shaped portion 55 is inserted. The through hole 57 is formed to penetrate through the front and back main surfaces of the plate-like main body 51.

FIG. 5 is an end view of the cut portion of the plate 13 illustrating the shape of the cut end surface along the rib 53. As shown in FIG. The hook-shaped portion 55 of the rib 53 is inserted into the through-hole 57 , and the rib 53 further slides in the extending direction of the rib 53 , so that the hook-shaped portion 55 engages with the edge 59 of the through-hole 57 . As a result, the ribs 53 are supported by the plate main body 51 so as not to separate from the plate main body 51. The plate main body 51 and the ribs 53 may be fixed to each other with an adhesive.

Returning to FIG. 4, in the illustrated example, out of the plate body 51 whose principal surface is approximately rectangular, there are two paper tubes 10 on opposite sides of the two paper tubes 10 into which the end portions 52 of the plate body 13 are inserted. The rib 53 is not installed on the end portion 54 that is inserted into the paper tube 10. When the plate main body 51 is approximately rectangular as shown in the illustrated example, in order to increase the bending rigidity of the plate 13, the ribs 53 are arranged at the ends 52 along the long sides rather than at the ends 54 along the short sides. It is more advantageous to provide the

Four grooves 61 are formed in the plate main body 51. The four grooves 61 open at both ends in the axial direction of the two paper tubes 10 into which the end portions 52 of the plate bodies 13 are inserted in the plate body 51, and extend along the axial direction. The groove 61 is located closer to the center of the plate body 51 than the axis of the paper tube 10.

FIG. 6 is a plan sectional view showing an example of the internal structure of the frame 102 near the joint 11. In the illustrated example, the joint 11 has a cylindrical protrusion 63 protruding from the main body 17 in two directions perpendicular to each other. By fitting the protrusion 63 into the outer peripheral surface of the paper tube 10, the paper tube 10 and the joint 11 are connected. The paper tube 10 and the protrusion 63 may be fixed together with an adhesive. The slit 3 of the paper tube 10 extends from one end of the wall 1 to the other end along the axis 5, so that the end 52 of the plate 13 having the rib 53 is connected to both ends of the paper tube 10 in the direction of the axis 5. It is possible to insert it into the paper tube 10 from any of the above.

The groove 61 of the plate main body 51 is engaged with the protrusion 63 by receiving the protrusion 63 of the joint 11 . As a result, the displacement of the plate 13 in the direction in which the end 52 of the plate 13 comes out of the paper tube 10 is restrained. In the present disclosure, even if it is the inner circumferential surface of the groove 61 that comes into contact with the protrusion 63 and is locked, the expression that the groove 61 is locked is also used in the present disclosure.

FIG. 7 is a vertical sectional view showing an example of the end portion 52 of the plate body 13 having the rib 53 in the frame body 102, and the paper tube 10 that receives this end portion 52. The position of the cutting plane is represented by the AA cutting line in FIG. In the illustrated example, the rib 53 intersects the plate body 51 at the position of the central axis 5 of the paper tube 10 and extends in a direction perpendicular to the main surface of the plate body 51 until it touches the inner wall surface of the paper tube 10. ing. Further, the end edge 65 of the plate main body 51 is also in contact with the inner wall surface of the paper tube 10. By arranging the plate body 51 and the ribs 53 in this manner, the movement of the plate body 13 is restrained by the inner wall of the paper tube 10. At the same time, the bending rigidity of the plate body 13 is effectively increased. On the other hand, unlike the illustrated example, gaps may be provided between the plate main body 51 and the inner wall of the paper tube 10 and between the ribs 53 and the inner wall of the paper tube 10.

8 and 9 are vertical sectional views showing another example of the end portion 52 of the plate body 13 having the rib 53 in the frame body 102, and the paper tube 10 that receives this end portion 52. The position of the cut plane is represented by the AA cutting line in FIG. 5 in FIG. 8, and by the BB cutting line in FIG. In the example of FIGS. 8 and 9, a release paper 67 is attached to the main surface of the end portion 52 of the plate main body 51 and the main surface of the rib 53.

The release paper 67 is a paper material used to protect products such as synthetic resin plates and metal plates by attaching them to the main surface of these plate products at the time of product shipment, and one side is adhesive. and the other side is non-adhesive. The release paper 67 is used with its adhesive side attached to the main surface of the board product, but its adhesive strength is adjusted so that it can be easily peeled off when unnecessary, such as when using the product. When the plate main body 51 and ribs 53, which are plate products as parts of the frame 102, are received, the release paper 67 attached to these plate products is left only partially, and as shown in FIGS. 8 and 9. In the illustrated form, a release paper 67 can be attached to the end portion 52 and the rib 53.

When an external force is applied to the frame 102, the frictional noise generated at the contact surface between the end portion 52 and the rib 53 is reduced or eliminated by the release paper 67 interposed on the contact surface. It is sufficient that the release paper 67 is attached to the contact surface between the end portion 52 and the rib 53. However, it is easier to manufacture the frame 102 by leaving it on the entire main surface of the end portion 52 and the rib 53. Further, the release paper 67 may be attached only to a part of the contact surface between the end portion 52 and the rib 53. For example, the release paper 67 may be attached only to the main surface of the end portion 52. Even in that case, the fricative noise is reduced accordingly.

FIG. 10 is a plan sectional view showing another example of the internal structure of the frame 102 near the joint 11. In the illustrated example, the joint 11 and the paper tube 10 are locked by a wedge 69. The wedge 69 is easily made by cutting out a paper tube similar to the paper tube 10. In order to fit the wedge 69, a wedge insertion hole 71 is provided in the protrusion 63 of the joint 11, and a wedge insertion hole 73 is provided in the corresponding portion of the paper tube 10. By fitting the wedges 69 into these wedge insertion holes 71 and 73, the wedges 69 are prevented from falling off and the joint 11 and the paper tube 10 are connected so that they do not separate from each other. The wedge 69 may be fixed to the wedge insertion holes 71 and 73 with adhesive.

FIG. 11 is a plan sectional view illustrating the internal structure near the joint of a frame according to another embodiment of the present invention. In the illustrated frame 103, the plate main body 51 is not provided with the groove 61 (see FIG. 6). Even if there is no groove 61 for locking the plate main body 51 to the protrusion 63 of the joint 11, the rib 53 is locked to the wall 1 of the paper tube 10, so that the end 52 of the plate 13 is Exit from the tube 10 is prevented.

FIG. 12 is a perspective view showing another example of the structure of the paper tube. In the illustrated paper tube 75, the slit 3 formed in the wall 1 extends along the axis 5, leaving both ends of the wall 1 (both the left end and the right end in the figure). . Since the paper tube 75 has no slits 3 at both ends in the direction of the axis 5, its strength and shape retention are enhanced.

FIG. 13 is a plan sectional view illustrating the internal structure near the joint of a frame according to yet another embodiment of the present invention. In the illustrated frame 104, the paper tube 10 in which the end portion 54 of the plate 13 is inserted in the frame 103 (see FIG. 11) is replaced with a paper tube 75 illustrated in FIG. 12. The end portion 54 is inserted into the paper tube 75 by passing through the slit 3 of the paper tube 75. Since the paper tube 75 is used, the strength of the frame 104 is increased.

FIG. 14 is a perspective view showing yet another example of the structure of the paper tube. In the illustrated paper tube 77, the slit 3 formed in the wall 1 extends along the axis 5, leaving only one (the right end in the figure) of both ends of the wall 1. Since the paper tube 77 does not have the slit 3 at one of both ends in the direction of the axis 5, its strength and shape retention are increased accordingly.

FIG. 15 is a plan sectional view illustrating the internal structure near the joint of a frame according to yet another embodiment of the present invention. In the illustrated frame 105, the paper tube 10 into which the end portion 52 of the plate body 13 is inserted in the frame 104 (see FIG. 13) is replaced with a paper tube 77 illustrated in FIG. The end portion 52 is inserted into the paper tube 77 by passing through the slit 3 of the paper tube 77. The slit 3 of the paper tube 77 extends along the axis 5 leaving only one end (the left end in the figure) of both ends of the wall 1, so that the end 52 of the plate 13 having the rib 53 is , it is possible to insert it into the paper tube 77 from one end of the paper tube 77 in the direction of the axis 5 (the right end not shown in the figure). Since the paper tube 77 is used, the strength of the frame 105 is increased.

FIG. 16 is a perspective view illustrating the configuration of a paper tube composite. The illustrated paper tube composite 79 includes a paper tube 10 and a paper tube 15. 16(a) illustrates the paper tube composite 79, and FIG. 16(b) illustrates the paper tube 15. The paper tube 10 is the same as the paper tube 10 illustrated in FIG. 3, and the slit 3 extends from one end of the wall 1 to the other end along the axis 5. The paper tube 15 is a paper tube that is arranged in a part of the paper tube 10 along the axis 5 and surrounds the part so as to be in contact with the outer peripheral surface of the part. In the illustrated example, the paper tubes 15 are arranged at both ends of the paper tube 10 in the direction of the axis 5. Although the slit 3 of the paper tube 10 extends from one end to the other end of the paper tube composite 79, the strength and shape retention of the paper tube 15 are enhanced by the paper tube 15. That is, the paper tube 15 functions as a reinforcing body that reinforces the paper tube 10.

FIG. 17 is a plan sectional view illustrating the internal structure near the joint of a frame according to yet another embodiment of the present invention. In the frame 106 of the illustrated example, a paper tube composite 79 illustrated in FIG. 16 is used instead of the paper tube 10 in the frame 102 (see FIG. 11), and a joint 81 is used instead of the joint 11. In the joint 81, a cylindrical protrusion 19 protrudes from the main body 17 in two directions perpendicular to each other. By fitting the protrusion 19 into the inner cavity of the paper tube 10, the paper tube 10 and the joint 11 are connected. The paper tube 10 and the protrusion 19 may be fixed to each other with an adhesive. Similarly, the paper tube 15 and the paper tube 10, which are components of the paper tube composite 79, may be fixed to each other with an adhesive. The joint 81 is made of synthetic resin, for example.

Since the slit 3 of the paper tube 10 extends from one end of the wall 1 to the other end along the axis 5, before placing the paper tube 15 at both ends of the paper tube 10, the plate 13 having the ribs 53 is can be inserted into the paper tube 10 from one end of the paper tube 10 in the direction of the axis 5 . Since the paper tube 79 is used in the frame 106, the strength of the frame 106 is increased. Note that the paper tube 10 is used in the frame 106 as well as in the frame 102 and the like.

FIG. 18 is a plan view illustrating the configuration of a frame according to still another embodiment of the present invention. The illustrated frame 107 includes three paper tubes 10 of two types, long and short, and two paper tubes 20 of the same length. A total of five paper tubes 10, 20 are connected by four joints 11 so as to form five continuous sides of a hexagon. Slits 3 (not shown) are formed in the three paper tubes 10. The plate body 13 is supported by the three paper tubes 10 by being inserted into the three paper tubes 10 so that the ends 52 and 54 of the plate body 13 pass through these slits 3. The end portion 52 of the plate body 13 has a rib 53. The slits 3 may not be formed in the two paper tubes 20 that do not support the plate body 13. Desirable thicknesses, inner diameters, and lengths of the paper tubes 10 and 20 constituting the frame 107 are the same as those described for the paper tube 10 constituting the frame 102.

The joints 11, 81 illustrated in FIGS. 6, 17, etc. are formed so that the two protrusions 63, 19 not only extend in two directions perpendicular to each other, but also extend in two directions that intersect at various angles. It is also possible to form Thereby, as illustrated in FIG. 18, the paper tubes 10 and 20 can be connected by the joint 11 so that the paper tubes 10 and 20 constitute a plurality of consecutive sides of a polygon (including a triangle) other than a quadrangle. is also possible.

In the illustrated example, a cap 21 is connected to one end of two short paper tubes 10 instead of a joint 11. The cap 21 has, for example, a shape in which a protrusion similar to the protrusion 63 of the joint 11 illustrated in FIG. It is fitted into the outer peripheral surface of the paper tube 10 from above. The cap 21 is made of, for example, synthetic resin.

In the frame 107 illustrated in FIG. 18, the plate 13 is supported by three paper tubes 10. On the other hand, it is also possible to support the plate body 13 by two paper tubes 10. For example, in FIG. 18, the paper tube 20 is replaced with a paper tube 10 of the same length, the paper tube 10 is replaced with a paper tube 20 of the same length, and the two replaced paper tubes 10 (in FIG. By inserting the plate body 13 into the paper tube 10 so that the end portion 52 of the plate body 13 passes through the slit 3 of the paper tube 10) placed at the position of the tube 20, the plate body 13 is inserted into two paper tubes. It may also be supported by the tube 10. Furthermore, in the frame body 102 illustrated in FIG. 2, the end portions 52 of the plate body 13 are inserted into two paper tubes 10 (two paper tubes 10, upper and lower in FIG. 2) forming the long sides of a rectangle, for example. It may only be supported by

FIG. 19 is a photograph illustrating the appearance of furniture according to another embodiment of the present invention. The illustrated furniture 108 has a structure in which a three-stage frame 106 (see FIG. 17) is connected to four pillars. Furniture 108 can be used, for example, as a rack. In the furniture 108, the paper tube composite 79 and the joint 81 illustrated in FIG. 17 are used. The plate bodies 13 arranged in three stages are transparent acrylic plates. In the illustrated example, the outer peripheral surface of the paper tube 79 is coated with a paint that gives it a metallic luster. By using a three-way joint and a four-way joint as the joint 81, the furniture 108 having such a three-dimensional structure can be realized.

(Other embodiments)
(1) In the embodiment of the invention described above, as illustrated in FIG. 7, the thickness of the end portion 52 of the plate body 13 including the rib 53 (in FIG. ) is set larger than the width of the slit 3 of the paper tube 10 into which the end portion 52 is inserted (the distance between the pair of side walls of the slit 3 extending along the axis 5). Thereby, while keeping the width of the slit 3 small, the thickness of the end portion 52 can be increased, and the bending rigidity of the plate body 13 can be increased. Further, even if the plate 13 does not have the groove 61 (see FIGS. 4 and 6), the end portion 52 of the plate 13 is prevented from coming out of the paper tube 10.

On the other hand, it is also possible to set the width of the slit 3 of the paper tube 10 into which the end portion 52 is inserted to be greater than the thickness of the end portion 52 of the plate body 13. In this case, the end 52 of the plate 13 having the rib 53 can be inserted into the paper tube 10 from the front of the slit 3 through the slit 3. Therefore, it is also possible to use the paper tube 75 illustrated in FIG. 12 as the paper tube that supports the end portion 52 of the plate body 13.

(2) In the embodiment of the invention described above, the ribs 53 were supported by the plate main body 51 by engaging with the plate main body 51, as illustrated in FIGS. 4 and 5. On the other hand, the rib 53 may be configured as a plate-shaped body integrally molded with the plate body 51 so as to stand up from the plate body 51. Further, the rib 53 does not have to be a plate-like member, and may have another shape such as a half-moon cross section. Furthermore, the ribs 53 may not stand up from both main surfaces of the end portion 52 of the plate main body 51, but may stand up only from one main surface.

(3) As illustrated in FIG. 6, the groove 61 provided in the plate main body 51 accepts the insertion of the protrusion 63 of the joint 11, and is engaged with the protrusion 63, so that the end of the plate body 13 The movement of the plate body 13 in the direction in which the part 52 comes out of the paper tube 10 is restrained. On the other hand, as illustrated in FIGS. 15 and 17, in the frames 105 and 106 in which a paper tube 77 in which the slit 3 is not provided at the end or a paper tube composite 79 is used, the plate body 51 By forming a groove 61 that accepts insertion of both the wall 1 and the protrusion 63 or both the wall 1 and the paper tube 15, the plate 13 is moved in the direction in which the end 52 comes out of the paper tube 10. It is possible to stop movement.

1 wall, 3 slit, 5 shaft, 10 paper tube, 11 joint, 13, 13A, 13B, 13C plate, 15 paper tube, 17 main body, 19 protrusion, 20 paper tube, 21 cap, 52, 54 end Part, 51 plate body, 53 rib, 55 hook-shaped part, 57 through hole, 59 edge, 61 groove, 63 protrusion, 65 edge, 67 release paper, 69 wedge, 71, 73 wedge insertion hole, 75, 77, 79 paper tube, 81 joint, 101 furniture, 102, 103, 104, 105, 106, 107 frame, 108 furniture.

Claims (9)

A frame body,
multiple paper tubes,
a plurality of joints connecting the plurality of paper tubes so that the plurality of paper tubes constitute a plurality of continuous sides of a polygon,
Each of at least two paper tubes among the plurality of paper tubes has a slit extending along the axis and penetrating the wall inside and outside,
The frame body is a plate body supported by the at least two paper tubes by having an end inserted into the at least two paper tubes so as to pass through the slits each of the at least two paper tubes has. Furthermore,
The plate body is
a plate main body having a main surface;
At the end inserted into at least one of the at least two paper tubes, a rib protrudes from the main surface of the plate main body and extends in the axial direction of the inserted paper tube; A frame body having . The at least one paper tube has the slit extending to at least one of both ends in the axial direction,
The thickness of the end portion of the plate body including the plate body and the ribs in the direction perpendicular to the main surface is the thickness of the paper tube into which the end portion of the plate body where the ribs extend is inserted. The frame according to claim 1, wherein the width of the slit is larger than the width of the slit. The plurality of paper tubes are four paper tubes,
The plurality of joints are four joints,
the polygon is a rectangle;
The at least two paper tubes are the four paper tubes,
The frame according to claim 1 or 2, wherein the at least one paper tube is two paper tubes located at positions facing each other. The plate main body has four grooves that are open at both ends of the plate main body in the axial direction of the two paper tubes located at positions facing each other and extend along the axial direction,
The four grooves are locked to the four joints or the walls of the two paper tubes by receiving insertion of the four joints or the walls of the two paper tubes. 4. According to claim 3, the movement of the inserted plate in the direction in which the end of the inserted plate comes out from the two paper tubes located at positions facing each other is thereby restrained. frame body. The rib has a hook-shaped portion,
The plate main body has a through hole that is formed to penetrate the main surface and accepts insertion of the hooked portion,
The rib is configured such that the hook-shaped portion is inserted into the through-hole and the rib further slides in the extending direction of the rib, so that the hook-shaped portion engages with the edge of the through-hole. 3. The frame according to claim 1, wherein the frame is supported by the plate main body so as not to be separated from the plate main body. The frame according to claim 5, wherein the rib is plate-shaped. The frame according to claim 6, further comprising a release paper interposed in at least a portion of the contact portion between the rib and the plate main body. The plurality of paper tubes and the plurality of joints have wedge insertion holes provided so as to overlap with each other in each of the connecting portions of the paper tubes and the joints that are connected to each other,
Claim 1 or 2, wherein a wedge cut out from a paper tube is fitted into the wedge insertion hole, whereby the plurality of paper tubes and the plurality of joints are connected while being prevented from separating from each other. Frame as described. Furniture comprising the frame according to claim 1 or 2.