JP2010104830A - Fixation structure to frame - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure enabling fixation without generating looseness or wrinkles when a material exerting appropriate resiliency and tension is fixed to a frame, while increasing a force for engaging the material with the frame by the tension of the material itself. <P>SOLUTION: In the fixation structure for fixing the material 3 exerting the appropriate flexibility and the tension to the frame, a retaining plate 4 is provided on an end of the material 3 and a groove 44 or a beam for engaging the plate 4 is provided on the frame side. The groove 44 or the beam engages with the plate 4 in a direction for increasing the engaging force with the tension of the material 3 by the tension of the material 3 in the stretched state with its end going around and covering the frame. By engaging the plate 4 with the groove 44 or the beam, the end of the material 3 is fixed to the frame in the state that the tension is applied to the material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mounting structure for fixing a material capable of exhibiting appropriate elasticity and tension to a frame. More specifically, the present invention relates to a structure for attaching to a back frame a material that can exhibit appropriate elasticity and tension, for example, in the backrest of a chair.

  As shown in FIG. 15, the conventional backrest mounting structure includes a backrest portion 101 having cushioning properties, an inner shell 102 serving as an aggregate of the backrest portion 101, and screws 103 attached to the inner shell 102. A back support rod 104 that connects the backrest portion 101 to the seat, and an outer shell 105 that is attached to the back side of the backrest portion 101 so as to cover the connecting portion between the inner shell 102 and the back support rod 104. (See FIG. 4 of JP 07-095912 A). In addition, a chair has also been proposed in which a surface that supports the body is configured by an elastic film fixed to a frame in a pretensioned state (Patent Document 2). The chair frame structure is formed by injecting thermoplastic plastic onto the peripheral portion of the elastic membrane in a state in which pre-tension is applied in in-mold molding (in-mold), and molding the annular support member to form the peripheral portion of the membrane. An elastic membrane member fixed by a flexible but semi-rigid plastic support member is obtained, and the elastic membrane member is attached to a continuous annular channel formed on the top surface of a frame made of glass fiber reinforced thermoplastic film. By inserting and fixing the support member, the elastic membrane is supported so as to cross the opening of the frame to constitute the seat and the backrest. The frame and the elastic membrane support member are fixed to the channel of the frame by an interlocking strip provided on the bottom surface of the support member.

JP 07-095912 A Special table hei 08-507935

  However, in the conventional backrest mounting structure, since the outer shell 105 is used, there is a problem that the number of parts increases and the number of assembling steps increases. Moreover, since the screw 103 is frequently used for the attachment of the backrest, there is a problem that the attachment and removal work of the backrest is troublesome.

  Therefore, an object of the present invention is to provide an attachment structure that can avoid loosening and wrinkling when a material capable of exhibiting appropriate elasticity and tension is fixed to a frame. Another object of the present invention is to provide an attachment structure that increases the engagement force by the tension of the material itself by engaging the frame with a material that can exhibit moderate elasticity and tension. And

  In order to achieve this object, the invention according to claim 1 is a mounting structure for fixing a material capable of exhibiting appropriate elasticity and tension to the frame, and includes a locking plate at an end of the material and the frame side. A groove or a beam for engaging the locking plate is provided on the frame, and the groove or beam wraps around the frame so that the end of the groove or beam covers the frame when the material is pulled. The engaging plate is engaged in the direction in which the engaging force is increased by the tension of the wire, and the locking plate is engaged with the groove or beam, and the end of the material is fixed to the frame in a state where the material is tensioned. To do.

  Further, the present invention provides a mounting method for fixing a material capable of exhibiting appropriate elasticity and tension to a frame, and includes a locking plate at an end portion of the material and engaging the locking plate on the frame side. A groove or beam is provided, and the end of the material is pulled so that the end wraps around the frame, and then the locking plate is engaged with the groove or beam of the frame, and the locking plate is By engaging in the direction in which the engaging force is increased by the tension of the material, the end of the material is fixed to the frame in a state where the material is tensioned.

  Therefore, when the locking plate at the end of the material is engaged with the frame-side groove or beam, tension is applied to the material, and the locking plate and the frame-side groove or beam are applied by the tension of the material. The engagement plate is engaged in the direction in which the engagement force is increased, so that the locking plate is prevented from coming off from the groove or beam on the frame side. Moreover, since the locking plate is engaged with the frame while the material is pulled, the material is fixed to the frame while being given an appropriate tension.

  Here, the locking plate is preferably made of resin. Further, it is preferable that the locking plate has a hook shape, and is fixed by being hooked and tensioned to the beam of the frame.

  Moreover, it is preferable that the hook-shaped latching plate is longer than the piece by which the piece by which a raw material is sewn is hooked on a beam.

  As is clear from the above description, according to the present invention, the material constituting the surface supporting the body is moderate by attaching a material that can exhibit appropriate elasticity and tension while pulling the locking plate to the frame. Since it is fixed to the frame while being given a proper tension, it is possible to avoid loosening and wrinkling of the material. Further, since the end of the material is once turned into the frame and the locking plate is engaged with the groove or beam of the frame, the tension between the locking plate and the groove or beam on the frame side is caused by the tension of the material itself. Since the engagement force can be increased, it is possible to maintain an appropriate tension of the material and prevent the locking plate from coming off from the groove or the cross beam of the frame.

It is a schematic perspective view which shows one Embodiment of the backrest to which the attachment structure of the backrest of this invention is applied. It is a general | schematic center cross-section side view which shows the one aspect | mode of the engaging part of the mounting structure of the said backrest. It is a general | schematic disassembled perspective view which shows an example of a structure of the lumbar support mechanism with which the chair which applied the said backrest attachment structure is provided. It is a schematic sectional side view which shows an example of operation | movement of the said lumbar support mechanism. It is a schematic sectional side view which shows the other example of operation | movement of the said lumbar support mechanism. It is a general | schematic center cross-section side view which shows the seat seat vicinity of the chair to which the said backrest attachment structure is applied. It is a schematic side view of the chair to which the mounting structure for the backrest is applied. It is a schematic perspective view which shows the other example of the structure of a back frame. It is a general | schematic center longitudinal cross-section side view which shows the connection structure of a backrest part and a back frame, (A) is engaging the recessed part and the convex part, (B) is engaging the peak part and the trough part, respectively. It is a general | schematic center cross-section side view which shows the other aspect of the engagement by a latching | locking part. It is a general | schematic center cross-section side view which shows the other another aspect of the engagement by a latching | locking part. It is a general | schematic center cross-section side view which shows the other another aspect of the engagement by a latching | locking part. It is a general | schematic center cross-section side view which shows another engagement aspect. It is a general | schematic center cross-section side view which shows another engagement aspect. It is a perspective view which shows the attachment structure of the conventional backrest.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 to 12 show an embodiment of a backrest mounting structure according to the present invention. This backrest mounting structure is a chair 11 having at least a backrest 1 that supports the back of a seated person and a back frame 2 that connects the backrest 1 to a seat 15, and the backrest 1 is a back frame. 2 has a pocket 3 that covers the upper portion of the back frame 2, and the pocket 3 has a locking portion 4 that engages with the upper portion of the back frame 2 and prevents the upper portion from coming out of the pocket 3. The back portion 1 is attached to the back frame 2 by covering the upper portion thereof with the pocket 3 and engaging the locking portion 4 with the covered upper portion.

  The backrest 1 of the present embodiment includes, for example, an inner shell 5 and a bag-shaped skin member 8 that encloses the inner shell 5. In the case of such a configuration, a compact backrest 1 having a high cushioning property and a small thickness can be obtained. However, this embodiment is a suitable example, and the configuration of the backrest 1 is not limited to the example of this embodiment.

  The inner shell 5 is formed in a frame shape, for example. More specifically, the inner shell 5 of the present embodiment is formed in a curved shape so that the front surface is rectangular and the side surface protrudes slightly toward the waist of the seated person. By making the inner shell 5 into a frame shape, the back of the seated person can be supported only by the skin member 8 to obtain a high cushioning property, and the sitting comfort can be improved. However, the shape of the inner shell 5 is not particularly limited as long as it can form a surface required as a backrest, and various shapes can be adopted. For example, a rectangular shape is generally used, but from a viewpoint of aesthetic processing, ergonomics, etc., it may be curved or other shapes, and a closed frame is not necessarily formed. The inner shell 5 preferably has a rigidity capable of maintaining the shape as the backrest portion 1 and a flexibility allowing a certain degree of deformation so that the inner shell 5 can be easily attached to the back frame 2. The material, thickness, and the like of the inner shell 5 can be selected so as to have the rigidity and flexibility. As a material of the inner shell 5, for example, use of a synthetic resin having appropriate rigidity and elasticity is preferable. However, the material of the inner shell 5 is not limited to a synthetic resin, and any material having both desired rigidity and flexibility may be used.

  The skin member 8 is formed in a bag shape having an opening on the lower end side of the backrest, for example, using a material that can exhibit appropriate elasticity and tension. The skin member 8 is formed to be slightly smaller than the inner shell 5, and functions as an elastic support element for the backrest by including the inner shell 5, and functions as an upholstery that constitutes the backrest surface. I am doing so. As the material of the skin member 8, a material that can exhibit appropriate elasticity and tension, which is appropriately selected as necessary, a film (for example, a resin film such as a polyester elastomer or a polyurethane elastomer, or a resin film made of a fiber such as polyamide). Or a fabric reinforced with a woven fabric such as taffeta), a fabric, a non-woven fabric, or the like can be applied as appropriate. In particular, it is preferable to use a polyester mesh sheet that has little sag and has good elasticity and breathability. In addition, it is preferable to close the opening part of the skin member 8 after accommodating the inner shell 5 by a tucker, a sewing, etc. so that the inner shell 5 may not come out.

  The pocket 3 is provided on the skin member 8 by sewing using, for example, a material that can exhibit appropriate elasticity and tension (in this embodiment, the same material as the skin member 8). The size of the pocket 3 is not necessarily limited, but as large as occupying the upper half of the back surface of the backrest portion 1 (that is, the surface to which the back frame 2 is attached) as shown in FIG. It is preferable from the viewpoint of stability of attachment to the back frame 2 and the like. The opening of the pocket 3 is formed so as to be horizontal at a substantially intermediate portion on the back side of the backrest 1. The pocket 3 of the present embodiment is formed by providing another bag on the bag-shaped skin member 8 in which the inner shell 5 is wrapped, but is not necessarily limited to this form. For example, the pocket 3 may be configured by making a cut so as to be horizontal at a substantially intermediate portion on the back side of the skin member 8 in which the inner shell 5 is wrapped.

  The upper part of the back frame 2 covered with the pocket 3 is formed to have a part facing the inner shell 5 and a part engaging with the locking part 4. A portion facing the inner shell 5 has a function of stably supporting the backrest portion 1, and a portion engaging with the locking portion 4 has a function of preventing the upper portion of the back frame 2 from slipping out of the pocket 3. More specifically, for example, the back frame 2 in the present embodiment is configured to include a frame body 9 covered by the pocket 3 and a lower frame 14 that supports the frame body 9. The frame body 9 is configured to have a U-shaped portion 9 a facing the substantially upper half of the inner shell 5, and a horizontal beam 9 b located near the opening of the pocket 3. The back frame 2 preferably has high rigidity so as to stably support the backrest 1 having high flexibility. For this reason, in the frame body 9 of this embodiment, a U-shaped portion 9a and a cross beam 9b are integrally formed using a synthetic resin harder than the inner shell 5 (for example, a nylon-based synthetic resin). Further, the lower frame 14 is formed using a metal material (for example, an aluminum alloy or zinc die cast that is lightweight and excellent in rigidity). The connecting portions 9c and 14a between the frame body 9 and the lower frame 14 are formed in a shape to be fitted to each other. By fitting and screwing these connecting portions 9c and 14a, the frame body 9 and the lower frame 14 are connected to each other. It is fixed integrally. However, the structure of the back frame 2 is not limited to the example of this embodiment. For example, as shown in FIG. 8, the frame body 9 may be attached to the lower frame 14 so as to be rotatable around the pin 63. In some cases, the frame 9 and the lower frame 14 may be integrally formed of resin or metal material.

  The pocket 3 is provided with a locking plate 4 as a locking portion. The locking plate 4 is made of, for example, resin, and is attached to the inside of the opening edge 3a of the pocket 3 by sewing so as to engage with the cross beam 9b of the back frame 2. On the other hand, the cross beam 9b of the present embodiment is fitted on the front side (seater's side) while the locking plate 4 is fitted with tension (tension) applied to the pocket 3, and the fitted locking plate 4 is inserted into the pocket 3. It is formed so as to prevent it from being pulled out of the fitted state by being pulled by the tension. More specifically, as shown in FIG. 2, the cross beam 9 b of the present embodiment has a space 20 in which the locking plate 4 is fitted and a state in which the fitted locking plate 4 is fitted by the tension of the pocket 3. It is formed to have a groove 21 that prevents it from coming out. That is, a locking plate is provided at an end of a material capable of exhibiting appropriate elasticity and tension, and a groove or a beam for engaging the locking plate is provided on the frame side, and the groove or beam is formed of the material. In a state where the frame is pulled, the end portion thereof turns around to cover the frame, and the engagement plate is engaged in a direction in which the engagement force is increased by the tension of the material. The engagement plate is engaged with the groove or beam. A stopper plate is engaged to fix the end of the material to the frame in a state where tension is applied to the material.

  Further, it is more preferable that the engaging portion 4 is engaged with the upper portion of the back frame 2 to generate tension in the pocket 3 or the skin member 8 and increase the engaging force by the tension. For example, as shown in FIG. 10, a locking claw 43 for preventing the fitted locking plate 4 from coming out may be provided on the front side (seater's side) of the horizontal beam 9b. For example, as shown in FIG. 11, a deep groove 44 that opens upward from the backrest 1 and into which more than half of the locking plate 4 is inserted may be formed in the cross beam 9b. Further, for example, as shown in FIG. 12, the locking portion 4 may be formed in a hook shape and hooked on a plate-like horizontal beam 9b.

  Here, as shown in FIG. 13, the end of the material 3 is fixed to the frame 9 in some cases as shown in FIG. Magic tape (registered trademark)) may be used as the locking portion. In this case, for example, an opening / closing tape 45 is provided at the opening edge 3a of the pocket 3 and a position opposed to the opening edge 3a when the opening edge 3a is wound around the horizontal beam 9b, so that the opening edge 3a is connected to the horizontal beam 9b. Then, it is fastened with a pair of opening and closing tapes 45. Further, for example, as shown in FIG. 14, a fitting button 46 that is fitted by being pressed may be used as the locking portion. In this case, for example, a fitting-type button 46 is provided at the opening edge 3a of the pocket 3 and a position facing the opening edge 3a when the opening edge 3a is wound around the horizontal beam 9b, and the opening edge 3a is formed on the horizontal beam 9b. It winds up, and it makes it fit the button 46 used as a pair. Further, although not shown, the upper portion of the back frame 2 covered with the pocket 3 is prevented from coming out of the pocket 3 by closing the opening of the pocket 3 using the above-described opening / closing tape 45 or the fitting button 46 or the like. You may make it do.

  The lower end part of the backrest part 1 of this embodiment is attached to the lumbar support mechanism, for example. This lumbar support mechanism is capable of adjusting the protruding amount of the bent portion 1a formed in the backrest portion 1 so as to protrude toward the waist of the seated person. The lumbar support mechanism of the present embodiment includes, for example, a fixed plate 22 fixed to the lower frames 14 and 14 so as to span between a pair of lower frames 14 and 14, and a backrest portion attached to the fixed plate 22. 1 and a movable member 23 configured to be movable upward and downward. The lower end portion of the backrest portion 1 of the present embodiment is attached to the movable member 23. For example, a groove 35 into which the lower end portion of the backrest 1 is inserted is formed in the movable member 23.

  The fixing plate 22 is formed in a substantially box shape opened on the lower surface side (grounding surface side), and is fixed to an attachment portion 24 formed integrally with the lower frame 14 by, for example, screwing. The movable member 23 is formed so as to have a portion 23a accommodated in a space formed between the pair of lower frames 14 and 14, and a protruding portion 23b engaged with the pair of lower frames 14 and 14. A slider 26 guided by a guide shaft 25 provided on the lower surface side of the fixed plate 22 is integrally attached. The movable member 23 is configured to be movable between a position where the protruding portion 23 b engages with the lower frame 14 and a position where the slider 26 engages with the fixed plate 22.

  Further, a pair of brackets 27 and 27 are formed on the lower surface side of the fixed plate 22, and a lever 28 is swingably attached to the bracket 27. One end of the lever 28 is attached to the movable member 23, and the movable member 23 is guided and moved by the guide shaft 25 when the lever 28 swings. More specifically, the lever 28 includes a support shaft 29 that functions as a fulcrum, a pin 30 that functions as a power point, and a long hole 32 that functions as an action point. The pin 30 is inserted into a groove 31 formed in the movable member 23. The support shaft 29 is rotatably attached to the bracket 27. The crank portion 33 a of the crankshaft 33 passes through the long hole 32. The lever 28 has a shape in which a member 28a in which the pin 30 and the support shaft 29 are formed and a member 28b in which the long hole 32 is formed are integrally connected so as to form a substantially V shape. The member 28b in which the long hole 32 is formed is formed so that the width between the brackets 27 and 27 is narrower than that of the member 28a so as not to hinder the rotation of the crank portion 33a. A rotation shaft 33 b of the crankshaft 33 is attached to the bracket 27 so as to be rotatable around an axis parallel to the support shaft 29. The crank portion 33 a is formed between the pair of brackets 27 and 27 so as to rotate around the rotation shaft 33 b of the crankshaft 33.

  Therefore, when the crankshaft 33 is rotated forward or backward, the crank portion 33a rotates around the rotary shaft 33b while moving in the long hole 32, and accordingly, the lever 28 swings around the support shaft 29. The movable member 23 is pushed up via the pin 30 so as to approach the bent portion 1a of the backrest portion 1, or is pushed down so as to move away from the bent portion 1a. The movable member 23 that supports the lower end portion of the backrest 1 approaches the bent portion 1a of the backrest 1 so that the amount of protrusion of the bent portion 1a to the waist of the seated person increases (see FIG. 5). On the other hand, when the movable member 23 moves away from the bent portion 1a, the protruding amount of the bent portion 1a decreases (see FIG. 4). 4 and 5 are cross-sectional side views showing the inside of the bracket 27. FIG. Further, reference numeral 34 in FIG. 3 is an operation member attached to the crankshaft 33 so as to rotate integrally. However, you may comprise so that the crankshaft 33 may be rotated using tools, such as a driver, without using the operation member 34. FIG.

  Here, the chair 11 in the present embodiment is configured such that the seat and the backrest can be locked. However, it is needless to say that the chair to which the present invention is applied is not limited to one that can be locked. For example, as shown in FIGS. 6 and 7, the chair 11 according to the present embodiment is supported by the support body 7 through the leg 12, the support body 7 attached to the upper end side of the leg 12, and the front portion via the axis X <b> 1. And a lower frame 14 whose base end is attached to the support 7 via the axis X3 and is connected to the rear portion of the seat 13 via the axis X2 at the intermediate portion. . The lower frame 14 has a substantially L shape having a substantially horizontal portion and a substantially upright portion. The shaft X3 is fixed to the front end 48 of the lower frame 14 so as to rotate integrally. A shaft support portion 47 is provided integrally with the mounting portion 24 at a substantially central portion of the substantially horizontal portion of the lower frame 14, and the shaft X <b> 2 is attached to the shaft support portion 47. A seat 15 is configured by attaching a shell and a cushion (not shown) to the seat receiver 13. The seat receiver 13 and the support body 7 are rotatably connected by an axis X1. The lower frame 14 and the seat 13 are rotatably connected by an axis X2. The support 7 and the lower frame 14 are rotatably connected by an axis X3. The support 7 is formed with a long hole 16 serving as a slide guide for supporting the axis X1 slidably in the front-rear direction at the front end of the side wall. The axis X1 is urged toward the front end side of the long hole 16 by a reaction force mechanism 17 having an urging spring (for example, a compression coil spring). Moreover, the chair 11 in this embodiment is provided with the reaction force adjustment mechanism 18 which adjusts rocking hardness (spring force of the reaction force mechanism 17). Reference numeral 19 denotes a member for changing and adjusting the slide range of the axis X1. According to the chair 11, the lower frame 14 tilts backward, whereby the rear portion of the seat receiver 13 is pulled backward, and at the same time, the axis X <b> 1 slides and rotates backward in the long hole 16. Thereby, the urging spring of the reaction force mechanism 17 is compressed and a reaction force can be obtained. When the external force that tilts the lower frame 14 backward is released, the lower frame 14 is restored to the original position by the urging force of the urging spring of the reaction force mechanism 17.

  In the chair 11 of the present embodiment configured as described above, the backrest 1 is attached as follows, for example. That is, the frame 9 as an upper part of the back frame 2 is wrapped in the pocket 3 provided in the upper half of the back side of the backrest 1. Then, the locking plate 4 provided at the opening edge 3a of the pocket 3 is pulled into the pocket 3 while being pulled and attached to the front side of the cross beam 9b. By attaching the locking plate 4 while pulling, the backrest 1 is attached to the back frame 2 while being given an appropriate tension. Therefore, it is possible to avoid the occurrence of slack and wrinkles in the skin member 8 and the pocket 3. Further, the engagement of the locking plate 4 and the cross beam 9b prevents the upper portion of the back frame 2 from coming out of the pocket 3 while maintaining the appropriate tension. On the other hand, the lower end side of the backrest 1 is inserted into the groove 35 of the movable member 23. Thus, the backrest 1 is attached to the chair 11.

  Here, in this embodiment, in order to prevent the backrest portion 1 from being displaced with respect to the back frame 2, after the frame body 9 is wrapped in the pocket 3, for example, in the vicinity of both ends of the cross beam 9b, the back frame 2 and the backrest 1 are fastened with two screws 36. The inner shell 5 has an attachment portion 37 protruding from the lower end portion of the backrest portion 1, and the groove 35 of the movable member 23 is also shaped to receive the attachment portion 37 so that the lower end side of the backrest portion 1 is movable. After being inserted into the groove 35 of the member 23, the backrest 1 and the movable member 23 are fixed by, for example, fixing them to the mounting portion 37 from the lower surface side of the movable member 23 with two screws 38. . A resin pin or the like may be used instead of the screws 36 and 38. However, these screws are used to reliably prevent the backrest 1 and the back frame 2 from being displaced, and in some cases, the above-described screwing may not be performed. For example, a portion where the backrest 1 and the back frame 2 are overlapped (in this embodiment, the inner shell 5 of the backrest 1 and the U-shape of the frame 9 of the back frame 2 facing the inner shell 5) The mold portions 9a) may be configured to engage with each other to prevent the backrest 1 and the back frame 2 from being displaced. In this case, the mode of engagement is not particularly limited, and for example, a convex portion 39 and a concave portion 40 that completely fit together are formed as shown in FIG. 9A, or simply hooked as shown in FIG. 9B. You may form the peak part 41 and the trough part 42 of a grade.

  If the upper portion of the back frame 2 is covered with the pocket 3 and the backrest 1 is attached to the back frame 2 by engaging the engaging portion with the covered upper portion, the outer shell is not used. The backrest can be easily attached to the back frame with little or no screws. Further, even when screws or the like are used, it is sufficient if the backrest 1 and the back frame 2 can be prevented from being displaced, and a smaller number than the conventional screwing is sufficient. Therefore, the number of parts and work man-hours can be reduced. Moreover, since it is a simple attachment structure, the backrest part 1 can also be easily removed from the back frame 2 as needed. Furthermore, since the internal structure of the back frame 2 can be concealed by the pocket 3, the appearance and design of the chair 11 can be enhanced.

  Further, the inner shell 5 is overlapped on the frame body 9, so that the strength as the backrest is higher than the case where the aggregate for obtaining the rigidity is only the inner shell 5 or only the frame body 9.

  Furthermore, by providing the locking portion 4 at the opening edge 3 a of the pocket 3, it is possible to prevent the pocket 3 from being curled, loosening or wrinkling from occurring in the pocket 3, and the like. In addition, since the end of the pocket 3 (for example, the place where the locking plate 4 is sewn) is hidden inside the pocket 3, the appearance is also improved. Further, for example, the shape of the locking portion 4, the mounting position, or the manner of engagement with the upper portion of the back frame 2 is not necessarily limited to the example of the above-described embodiment. The point is that the upper portion of the back frame 2 covered with the pocket 3 (the frame body 9 in the example of the above embodiment) can be prevented from coming out of the pocket 3.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Back part 1a Bending part 2 Back frame 3 Pocket 3a Opening edge part 4 Locking plate (locking part)
5 Inner shell 8 Skin member (material that can exhibit moderate elasticity and tension)
9 Frame 23 Movable member

Claims (5)

In a mounting structure for fixing a material capable of exhibiting appropriate elasticity and tension to the frame, a groove or a beam for engaging the locking plate is provided on the frame side with a locking plate at the end of the material, In addition, the groove or beam is configured so that the end portion of the groove or beam turns around so as to cover the frame when the material is pulled, and engages the locking plate in a direction in which the engagement force is increased by the tension of the material. An attachment structure to the frame, in which the locking plate is engaged with the groove or beam to fix the end portion of the material to the frame in a state where tension is applied to the material. The attachment structure to the frame according to claim 1, wherein the locking plate is made of resin. The structure for attaching to a frame according to claim 1 or 2, wherein the locking plate has a hook shape and is fixed by being hooked and fixed to a beam of the frame. 4. The attachment structure to the frame according to claim 3, wherein the hook-shaped locking plate has a longer piece on which the material is sewn than a piece hooked on the beam. In a mounting method for fixing a material capable of exhibiting appropriate elasticity and tension to the frame, a groove or a beam is provided on the end of the material to engage the locking plate at the frame side with a locking plate, The end of the material is pulled so that the end wraps around the frame, and then the locking plate is engaged with the groove or beam of the frame, and the locking plate is engaged by the tension of the material. A method of attaching to the frame, in which the end of the material is fixed to the frame in a state where tension is applied to the material by engaging in a direction in which the material is increased.

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