JP7133181B1 - frame and furniture - Google Patents

Abstract

A frame body having a structure in which a plate body is supported by a paper tube by inserting an end portion of the plate body into the paper tube through a slit formed in the paper tube. aim. SOLUTION: A frame according to the present disclosure includes a plurality of paper tubes, and a plurality of joints connecting the plurality of paper tubes so that the plurality of paper tubes form a plurality of continuous sides of a polygon. ing. Each of at least two paper tubes out of the plurality of paper tubes has a slit extending along the axis and penetrating the wall inside and outside. The frame further comprises a plate supported by the at least two paper tubes by inserting the ends into the at least two paper tubes so as to pass through the slits of each of the at least two paper tubes. there is The plate also has a plate body having a main surface and ribs. The rib protrudes from the main surface of the plate 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. [Selection diagram] Fig. 2

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", "wrap", and "support" items such as toilet paper cores, packing tape cores, award certificate storage tubes, and cardboard pallets. A variety of uses can be seen centering on the three functions (see Non-Patent Documents 1 and 2). Since the paper tube is made of paper, it is lightweight and can be returned to the soil after being discarded, which has the advantage of being environmentally friendly.

2. Description of the Related Art Conventionally, as disclosed in, for example, Patent Documents 1 and 2, furniture such as shelves and racks using paper tubes for supports, cross beams, and the like has been known. In such furniture, when arranging plates such as top plates and shelves, it is common to place the plate on top of a pillar, sandwich it between the upper and lower pillars, or place it on a horizontal beam. was customary.

On the other hand, the inventor of the present application has proposed a frame body having a structure in which a slit is formed in a paper tube and a plate is inserted into the paper tube through the slit, thereby improving the appearance and stably supporting the plate. (Patent Document 3). The frame can be a component of furniture. However, when a relatively heavy object is placed on the plate, or when a person sits on it, the plate may be bent.

Japanese Patent Application Laid-Open No. 09-168435 Jitsuzen Sho 60-134908 Patent No. 7038454

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

In view of the above problems, the present invention provides a frame having a structure in which a plate is supported by a paper tube by inserting the end of the plate into the paper tube through a slit formed in the paper tube, and the frame. An object of the present invention is to increase the bending rigidity of a plate in relation to furniture using a body.

In order to achieve the above object, a first aspect of the present invention provides a frame, comprising: 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 out of 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 inserting ends into the at least two paper tubes so as to pass through the slits of each of the at least two paper tubes. is further provided. Further, the plate has a plate body having a main surface and ribs. The rib protrudes from the main surface of the plate 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. exist.

According to this configuration, a paper tube is used for the beam portion of the frame, and a frame is realized in which the plate is inserted into the paper tube and supported. Such frames can be used as racks, shelves, chairs, and other components of various types of furniture. At the end of the plate inserted into at least one of the paper tubes that support the plate, there is a rib protruding from the main surface of the plate main body and extending in the axial direction of the inserted paper tube, The flexural rigidity of the plate is increased. Also, since the ribs are inside the paper tube, the appearance of the frame is not spoiled.

A second aspect of the present invention is the frame according to the first aspect, wherein the at least one paper tube has the slit extending to at least one of both ends in the axial direction. In addition, the thickness of the end portion of the plate including the plate main body and the ribs in the direction orthogonal to the main surface is the thickness of the plate into which the end portion of the plate to which the rib extends is inserted. It is larger than the width of the slit of 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 portion of the plate body extending with the ribs is inserted. Therefore, the flexural rigidity of the plate can be increased by increasing the thickness of the end portion of the plate while keeping the width of the slit small. Moreover, 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 on which the rib extends from coming out of the paper tube. Since the slit of the paper tube with the rib inside extends to at least one of the axial ends of the paper tube, 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 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 facing each other.

This configuration is particularly convenient for application to racks, shelves, chairs, and various assembly components, since the plurality of paper tubes is four and forms four sides of a rectangle. Since the plate is supported by the four paper tubes forming the four sides of the rectangle, the plate is supported more firmly. Since there are ribs at the ends of the plate inserted into the two paper tubes facing each other, the flexural rigidity of the plate is effectively increased.

According to a fourth aspect of the present invention, there is provided the frame according to the third aspect, wherein the plate main body is positioned in the axial direction of the two paper tubes 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 the insertion of the four joints or the walls of the two paper tubes. Thereby, the movement of the plate body in the direction in which the end portion of the inserted plate body comes out from the two paper tubes 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, thereby allowing the two paper tubes facing each other. The ends of the plate inserted into the paper tubes are restrained from moving in the direction of exiting from these paper tubes.

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

According to this configuration, it is not necessary to manufacture the plate body and the rib as an integral member, so manufacturing costs can be reduced.

A sixth aspect of the present invention is the frame according to the fifth aspect, wherein the rib is plate-shaped.
According to this configuration, since the rib is plate-shaped, the manufacturing cost can be further reduced.

A seventh aspect of the present invention is the frame 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 body.

According to this configuration, frictional noise is reduced or eliminated when a load is applied to the plate body. The release paper is attached as a protective sheet in the manufacturing process to the main surface of the plate main body or the main surface of the plate-shaped rib, so that the contact portion between the rib and the plate main body is partially left. can intervene.

According to an eighth aspect of the present invention, there is provided the frame body according to any one of the first to seventh aspects, wherein the plurality of paper tubes and the plurality of joints are the paper tubes and joints connected to each other. Each of the connecting portions has a wedge insertion hole provided so as to overlap 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, since the wedge cut out from the paper tube is used to maintain the connected state between the paper tube and the joint, the manufacturing cost for maintaining the connected state between the paper tube and the joint is reduced. Saved.

A ninth aspect of the present invention is furniture, comprising a frame according to any one of the first to eighth aspects.
According to this configuration, the bending rigidity of the plate constituting the furniture is enhanced.

As described above, according to the present invention, a frame having a structure in which a plate is supported by a paper tube by inserting an end portion of the plate into the paper tube through a slit formed in the paper tube, and the frame. With respect to body furniture, the bendability of the plate is enhanced.

4 is a photograph illustrating the appearance of furniture according to one embodiment of the present invention. FIG. 2 is a plan view illustrating the configuration of a frame body according to one embodiment of the present invention; FIG. 3 is a perspective view illustrating a configuration of a paper tube used for the frame of FIG. 2; 3 is a perspective view illustrating the configuration of a plate used for the frame of FIG. 2; FIG. FIG. 5 is a cut end view illustrating the shape of the cut end face along the rib of the plate of FIG. 4 ; FIG. 3 is a cross-sectional plan view showing an example of the internal structure near a joint in the frame of FIG. 2 ; FIG. 3 is a vertical cross-sectional view showing an example of a plate end portion having ribs and a paper tube for receiving the plate end portion of the frame of FIG. 2 ; 3 is a vertical cross-sectional view showing another example of a plate end portion having ribs and a paper tube for receiving the plate end portion of the frame of FIG. 2; FIG. FIG. 8 is a vertical cross section illustrating a cross section along a different cutting plane from the vertical cross sectional view of FIG. 8 of a plate end portion having ribs and a paper tube for receiving the plate end portion of the frame of FIG. It is a diagram. 3 is a cross-sectional plan view showing another example of the internal structure in the vicinity of the joint in the frame of FIG. 2. FIG. FIG. 10 is a cross-sectional plan view illustrating the internal structure near the joints of a frame body according to another embodiment of the present invention; FIG. 10 is a perspective view showing another example of the configuration of the paper tube; FIG. 10 is a cross-sectional plan view illustrating the internal structure near the joints of the frame body according to still another embodiment of the present invention; FIG. 11 is a perspective view showing still another example of the configuration of the paper tube; FIG. 10 is a cross-sectional plan view illustrating the internal structure near the joints of the frame body according to still another embodiment of the present invention; FIG. 3 is a perspective view illustrating the configuration of a paper tube composite; FIG. 10 is a cross-sectional plan view illustrating the internal structure near the joints of the frame body according to still another embodiment of the present invention; FIG. 10 is a plan view illustrating the configuration of a frame body according to still another embodiment of the present invention; 4 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 one embodiment of the present invention. The illustrated furniture 101 is configured as a chair. In the furniture 101, a frame is formed by connecting a large number of paper tubes 10 with a large number of joints 11. As shown in FIG. A rectangular frame is formed by connecting four paper tubes 10 with four joints 11 so as to form continuous four sides of a square. The framework of the furniture 101 is composed of a plurality of frames connected by sharing the paper tubes 10 and the joints 11 . In the illustrated example, the joints 11 include 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 as an example. In the illustrated example, the outer surface of the paper tube 10 is coated with a paint that imparts a metallic luster.

A plate 13 is supported by some of the frames. Among the plates 13, the plate 13A constitutes a back plate of the chair, the plate 13B constitutes a seat plate, and the plate 13C constitutes a placing plate for placing an article. The plates 13A, 13B, and 13C are, for example, synthetic resin plates, particularly transparent acrylic plates. Of the plates 13A, 13B, and 13C, the plate 13B, which constitutes the seat plate, receives the load caused by the user sitting on it. A frame according to an embodiment of the present invention described below includes a plate 13B functioning as a seat plate that receives a load, four paper tubes 10 supporting the plate 13B, and connecting 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 the frame body according to one 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 continuous four sides of a square. A plate 13 is supported by the four paper tubes 10 . The joint 11 is made of synthetic resin as an example. Further, the plate 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 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 a component of various pieces of furniture, such as the piece of furniture 101 illustrated in FIG.

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

Returning to FIG. 2, the slits 3 of the four cardboard tubes 10 are oriented so as to face the inside of the square formed by the four cardboard tubes 10 . The ends 52 and 54 of the plate 13 pass through the slits 3 of the four paper tubes 10 and reach the interior of the four paper tubes 10 . Thus, the plate 13 is supported by the four paper tubes 10 by inserting the ends 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 paper surface 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 to be smaller than the thickness of the plate 13, and the ends 52 and 54 of the plate 13 are pushed into the slit 3, thereby fitting the plate 13 into the paper tube 10. good. Thereby, the plate 13 is stably supported by the cardboard 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, the phrase "through a slit" is meant to include any form unless otherwise specified.

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

FIG. 4 is a perspective view illustrating the configuration of the plate 13 used for the frame 102. As shown in FIG. The plate 13 has a plate body 51 and ribs 53 . In the illustrated example, both the plate body 51 and the ribs 53 are plate-shaped having a main surface. The plate body 51 has a substantially rectangular main surface. The ribs 53 stand up from the main surface of the plate-like body 51 and are inserted into the regions of the plate body 51 corresponding to the ends 52 of the plates 13 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 13 . In the present disclosure, regions of the plate body 51 corresponding to the ends 52 and 54 of the plate 13 are also referred to as the ends 52 and 54 of the plate body 51 for convenience.

The rib 53 has a hooked portion 55 . On the other hand, the plate body 51 has a through hole 57 in the end portion 52 for receiving the insertion of the hook-shaped portion 55 . The through-holes 57 are formed so as to penetrate the front and back main surfaces of the plate-like main body 51 .

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

Returning to FIG. 4, in the illustrated example, of the plate body 51 having a substantially rectangular main surface, two other paper tubes 10 into which the end portions 52 of the plate 13 are inserted are opposite to the two paper tubes 10 . The rib 53 is not installed on the end portion 54 that is inserted into the paper tube 10 of . In the case where the plate body 51 is substantially rectangular as 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 the ends 54 along the short sides. It is more advantageous to provide

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

FIG. 6 is a cross-sectional plan view showing an example of the internal structure of the frame 102 near the joint 11. As shown in FIG. In the illustrated example, the joint 11 has a tubular projecting portion 63 projecting from the body portion 17 in two directions perpendicular to each other. The paper tube 10 and the joint 11 are connected by fitting the projecting portion 63 to the outer peripheral surface of the paper tube 10 . The cardboard tube 10 and the projecting portion 63 may be fixed with an adhesive. The slit 3 of the cardboard tube 10 extends along the axis 5 from one end of the wall 1 to the other end, so that the end 52 of the plate 13 having the ribs 53 is aligned with both ends of the cardboard tube 10 in the direction of the axis 5 . can be inserted into the paper tube 10 from either

The groove 61 of the plate body 51 is engaged with the protrusion 63 by receiving the insertion of 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 is pulled out of the paper tube 10 is restrained. The present disclosure also uses the expression that the groove 61 is locked even if it is the inner peripheral surface of the groove 61 that abuts and is locked by the protrusion 63 .

FIG. 7 is a vertical sectional view showing an example of the end portion 52 of the plate 13 having the rib 53 and the paper tube 10 receiving the end portion 52 of the frame 102 . The position of the cutting plane is indicated 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 cardboard 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 cardboard tube 10 . ing. The edge 65 of the plate 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 way, the movement of the plate 13 is restrained by the inner wall of the cardboard tube 10 . At the same time, the bending rigidity of the plate 13 is effectively enhanced. On the other hand, unlike the illustrated example, gaps may be provided between the plate body 51 and the inner wall of the cardboard tube 10 and between the ribs 53 and the inner wall of the cardboard tube 10 .

8 and 9 are vertical sectional views showing another example of the end portion 52 of the plate 13 having the rib 53 and the paper tube 10 receiving the end portion 52 of the frame 102. FIG. The positions of the cut planes are indicated by the AA section line in FIG. 5 in FIG. 8, and by the BB section line in FIG. In the examples of FIGS. 8 and 9 , the release paper 67 is attached to the main surface of the end portion 52 of the plate body 51 and the main surface of the rib 53 .

The release paper 67 is a paper material used for adhering to the main surface of a plate product such as a synthetic resin plate or a metal plate at the time of product shipment in order to protect the product. and the other side is non-sticky. The release paper 67 is used by adhering the sticky surface to the main surface of the plate product, and the adhesive force is adjusted so that it can be easily peeled off when the product is not needed, such as when using the product. When the plate main body 51 and the ribs 53, which are plate products as components of the frame 102, are received, the release paper 67 attached to these plate products is only partially left, as shown in FIGS. In the illustrated form, a release paper 67 can be attached to the ends 52 and ribs 53 .

Frictional noise generated at the contact surface between the end portion 52 and the rib 53 when an external force is applied to the frame 102 is reduced or eliminated by interposing the release paper 67 on the contact surface. It is sufficient that the release paper 67 is adhered to the contact surface between the end portion 52 and the rib 53 . However, it is easier to manufacture the frame 102 by leaving the end portions 52 and the ribs 53 on the entire main surface. Also, the release paper 67 may be adhered only to 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 correspondingly reduced.

FIG. 10 is a cross-sectional plan view showing another example of the internal structure of the frame 102 near the joint 11. As shown in FIG. In the illustrated example, the joint 11 and the paper tube 10 are locked by a wedge 69 . Wedge 69 is easily made by cutting from a paper tube similar to paper tube 10 . A wedge insertion hole 71 is provided in the projecting portion 63 of the joint 11 and a wedge insertion hole 73 is provided in the corresponding portion of the paper tube 10 for fitting the wedge 69 therein. By fitting the wedge 69 into these wedge insertion holes 71 and 73, the joint 11 and the cardboard tube 10 are connected so as not to separate from each other while preventing the wedge 69 from falling off. The wedge 69 may be fixed to the wedge insertion holes 71 and 73 with an adhesive.

FIG. 11 is a cross-sectional plan view illustrating the internal structure near the joints of a frame body according to another embodiment of the present invention. In the frame 103 of the illustrated example, the groove 61 (see FIG. 6) is not provided in the plate body 51 . Even if there is no groove 61 for locking the plate body 51 to the protruding portion 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 made of paper. Exit from the tube 10 is prevented.

FIG. 12 is a perspective view showing another example of the configuration 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 drawing). . Since the paper tube 75 has no slits 3 at both ends in the direction of the shaft 5, strength and shape retention are enhanced.

FIG. 13 is a cross-sectional plan view illustrating the internal structure near the joints of the frame body according to still another embodiment of the present invention. In the illustrated frame 104, the cardboard tube 10 into which the end portion 54 of the plate 13 is inserted is replaced with a cardboard tube 75 illustrated in FIG. 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 enhanced.

FIG. 14 is a perspective view showing still another example of the configuration 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 end (the right end in the figure) of the wall 1 . Since the cardboard tube 77 does not have the slit 3 at one of both end portions in the direction of the axis 5, the strength and shape retention properties are correspondingly enhanced.

FIG. 15 is a cross-sectional plan view illustrating the internal structure near the joints of the frame body according to still another embodiment of the present invention. In the illustrated frame 105, the paper tube 10 into which the end portion 52 of the plate 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 shaft 5 leaving only one of the two ends of the wall 1 (the left end in the drawing), so that the end 52 of the plate 13 having the rib 53 is , can be inserted 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 the paper tube composite. The illustrated cardboard tube composite 79 has a cardboard tube 10 and a cardboard tube 15 . 16(a) illustrates a paper tube composite 79, and FIG. 16(b) illustrates a paper tube 15. FIG. The paper tube 10 is the same as the paper tube 10 illustrated in FIG. 3, and the slit 3 extends along the axis 5 from one end of the wall 1 to the other end. 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 tube 15 is arranged at both ends of the paper tube 10 in the direction of the axis 5 . The cardboard tube composite 79 is enhanced in strength and shape retention by the cardboard tube 15 even though the slit 3 of the cardboard tube 10 extends from one end to the other end. That is, the paper tube 15 functions as a reinforcing member that reinforces the paper tube 10 .

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

Since the slits 3 in the paper tube 10 extend from one end to the other end of the wall 1 along the axis 5 , before the paper tubes 15 are arranged at both ends of the paper tube 10 , the plate 13 having the ribs 53 is formed. 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. It should be noted that the use of the paper tube 10 in the frame body 106 is the same as in the frame body 102 and the like.

FIG. 18 is a plan view illustrating the configuration of a frame body according to still another embodiment of the present invention. The illustrated frame 107 has three paper tubes 10 of two lengths and two paper tubes 20 of the same length. A total of five paper tubes 10 and 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 13 is supported by the three paper tubes 10 by inserting the plate 13 into the three paper tubes 10 so that the ends 52 and 54 of the plate 13 pass through these slits 3 . The edge 52 of the plate 13 has ribs 53 . The slits 3 may not be formed in the two paper tubes 20 that do not support the plate 13 . Desirable thicknesses, inner diameters, and lengths of the paper tubes 10 and 20 forming the frame 107 are the same as those described for the paper tube 10 forming the frame 102 .

The joints 11 and 81 exemplified in FIGS. 6, 17, etc. are formed so that the two protrusions 63 and 19 extend not only in two directions orthogonal to each other, but also in two directions intersecting at various angles. It is also possible to form Thereby, as illustrated in FIG. 18, the paper tubes 10 and 20 are connected by the joint 11 so that the paper tubes 10 and 20 form continuous plural sides of polygons (including triangles) other than squares. is also possible.

In the illustrated example, a cap 21 is connected to one end of the two short paper tubes 10 instead of the joint 11 being connected. 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 on the outer peripheral surface of the paper tube 10 from the bottom. The cap 21 is made of synthetic resin, for example.

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 13 by two paper tubes 10 . For example, in FIG. 18, the cardboard tube 20 is replaced with the cardboard tube 10 of the same length, and the cardboard tube 10 is replaced with the cardboard tube 20 of the same length. By inserting the plate 13 into the paper tube 10 so that the end portion 52 of the plate 13 penetrates the slit 3 of the paper tube 10) arranged at the position of the tube 20, the plate 13 is formed into two pieces of paper. It may be supported by tube 10 . In the frame body 102 illustrated in FIG. 2, the plate body 13 has the end portions 52 inserted into two paper tubes 10 (the upper and lower two paper tubes 10 in FIG. 2) forming the long sides of a square as an example. may be supported only 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. The furniture 108 uses the paper tube composite 79 and the joint 81 illustrated in FIG. The plates 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 imparts a metallic luster. By using a 3-way joint and a 4-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). As a result, the width of the slit 3 can be kept small, and the thickness of the end portion 52 can be increased to increase the bending rigidity of the plate 13 . Moreover, even if the plate 13 does not have the groove 61 (see FIGS. 4 and 6), the end 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 13 . In this case, the end portion 52 of the plate 13 having the ribs 53 can be passed through the slit 3 from the front and inserted into the paper tube 10 . Therefore, it is possible to use the paper tube 75 illustrated in FIG. 12 as the paper tube for supporting the end 52 of the plate 13 .

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

(3) As shown in FIG. 6, the groove 61 provided in the plate body 51 accepts the insertion of the projection 63 of the joint 11, and by being engaged with the projection 63, the edge of the plate 13 is held. The movement of the plate 13 in the direction in which the portion 52 is pulled 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 the paper tube 77 without the slit 3 at the end or the paper tube composite 79 is used, the plate body 51 By forming a groove 61 for receiving insertion of both the wall 1 and the projecting portion 63 or both the wall 1 and the paper tube 15, the plate 13 can be moved in the direction in which the end portion 52 comes out of the paper tube 10. It is possible to restrict movement.

1 wall 3 slit 5 axis 10 cardboard tube 11 joint 13, 13A, 13B, 13C plate 15 cardboard tube 17 main body 19 protrusion 20 cardboard tube 21 cap 52, 54 end Part 51 Plate body 53 Rib 55 Hook-shaped part 57 Through hole 59 Edge 61 Groove 63 Protruding part 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,
a plurality of paper tubes;
a plurality of joints that connect the plurality of paper tubes so that the plurality of paper tubes form a plurality of continuous sides of a polygon;
each of at least two paper tubes out of 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 inserting ends into the at least two paper tubes so as to pass through the slits of each of the at least two paper tubes. furthermore,
The plate is
a plate body having a main surface;
a rib projecting from the main surface of the plate body at the end inserted into at least one of the at least two paper tubes and extending in the axial direction of the inserted paper tube; , a frame having a the at least one paper tube has the slit extending to at least one end of both ends in the axial direction;
The thickness of the end of the plate including the plate main body and the ribs in the direction orthogonal to the main surface is the thickness of the paper tube into which the end of the plate from which the rib extends is inserted. 2. The frame according to claim 1, which is larger than the width of said slit of . The plurality of paper tubes are four paper tubes,
the plurality of joints is four joints;
the polygon is a rectangle;
The at least two paper tubes are the four paper tubes,
3. The frame according to claim 1, wherein said at least one paper tube is two paper tubes positioned to face each other. The plate body has four grooves that are open at both ends of the plate body in the axial direction of the two paper tubes 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 the insertion of the four joints or the walls of the two paper tubes. 4. The plate according to claim 3, wherein the movement of the plate in the direction in which the end of the inserted plate is pulled out from the two paper tubes facing each other is thereby restrained. frame body. The rib has a hook-shaped portion,
The plate body has a through hole formed to penetrate the main surface and receives the hook-shaped portion,
In the rib, the hook-shaped portion is inserted into the through-hole, and the rib slides in the extending direction of the rib to engage the hook-shaped portion with the edge of the through-hole, thereby 3. The frame according to claim 1 or 2, which is supported by said plate body so as not to separate from said plate body. The frame according to claim 5, wherein said rib is plate-shaped. 7. The frame according to claim 6, further comprising a release paper interposed in at least part of the contact portion between said rib and said plate body. The plurality of paper tubes and the plurality of joints have wedge insertion holes provided so as to overlap each other in each of the connecting portions between 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, thereby connecting the plurality of paper tubes and the plurality of joints while preventing them from separating from each other. The frame body described. Furniture comprising the frame according to claim 1 or 2.

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