JP2015096163A - Locking structure of covering fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking structure of a covering fabric which can fold an edge of the covering fabric along with a lock member and push them into an area that is hard to fit in such as a curved corner part even when a commercially available straight locking member is used.SOLUTION: In a locking structure of a covering fabric, an elongated plate-like lock member is attached to an edge part 5e of a covering fabric 5, and the edge part and the lock member are folded together and fitted into a groove formed in a frame. The lock member is used by combining a plurality of lock members with different mechanical properties, such as a resin cord. At the edge 5e at an area where the tension of the covering fabric 5 is easily applied, a lock member with a high bending flexural modulus such as a wide lock member 6 is provided. At the edge at an area where the lock member is hard to fit into the groove, a lock member with a lower bending flexural modulus than that of the lock member 6 where the tension is applied, such as a narrow lock member 7, is provided.

Description

  The present invention relates to the structure of a body support structure such as the back or seat of a chair. More specifically, the present invention relates to a locking structure for attaching to a frame a tension ground that can exhibit appropriate elasticity and tension constituting a backrest surface and a seating surface in a seat and a back.

  A body support structure such as a back or seat of a chair is provided with a groove for attaching a tensioned fabric (hereinafter referred to as a tensioned attachment groove) on the frame side along the body supporting surface such as a backrest surface or a seating surface. There has been known a tension-holding structure that uses a thin plate-shaped resin edge material in a groove to fix and fix the edge of the tension (Patent Document 1). This stretched fabric locking structure is made by sewing a straight edge material on the edge of the stretched fabric, and folding back the edge of the stretched fabric together with this edge material and pushing it into the groove on the frame side. Even if a tensile force is applied to the edge material, the edge material is caught in the groove so as not to come out of the groove. Since the commercially available resin cord used as the edge material is a straight line, when the corner portion of the frame is square, the vertical resin cord on the left and right sides and the edge material on the side of the upper side intersect at the corner portion. In order to avoid this, the edge material is provided as close as possible to the corner portion and sewn, and the edge material does not exist at the portion where the corner portion intersects, and only the tension is applied. Then, the edge material is pushed in to the corner of the corner portion, and only the upholstery is pushed in the absence of the edge material.

  In addition, a synthetic resin rim material (a flat plate-shaped core material) having a shape similar to the shape of the back frame is formed in advance using a molding die, and the rim material is accommodated in the edge of a stretched fabric sewn in a bag shape, There is also one that fixes the tensioning fabric to the back frame by fitting the edge of the tensioning fabric together with the edge material into the groove of the back frame (Patent Document 2).

  Furthermore, when the locking plate is bent tightly in a plane orthogonal to the direction in which the locking plate (resin plate) is folded together with the edge of the tensioned fabric, that is, when the locking plate is bent strongly in the thickness direction of the locking plate. It has been proposed to use a locking plate that is divided in the length direction between the front and rear straight portions of the curved portion at the entrance portion and the exit portion of the curved portion (Patent Document 3). For example, the back and the seat are cut at both end positions (that is, two places) of the curved portion between the horizontal straight portion and the vertical straight portion of the frame formed integrally continuously with the curved portion interposed therebetween, and are fitted into the horizontal straight portion. The horizontal portion locking plate, the curved portion locking plate fitted into the curved portion, and the vertical portion locking plate fitted into the vertical portion are divided.

JP 2007-130341 A JP2011-255076A JP 2011-110279

  However, the structure in which only the edge of the tension fabric is pushed into the tension groove attaching groove without reinforcing the edge material as in the invention described in Patent Document 1 is difficult to apply the force of pushing into the tension fabric. It is difficult to push the edge of the upholstery into the upholstery groove. For this reason, the work process which pushes in the edge of a tension | tensile_strength using a jig | tool or a tool is needed. Moreover, even if the edge of the tension is pushed in using a jig or a tool, depending on the form of the corner portion, there is a problem that the tension is pulled out while using the chair and pulled out from the groove. For example, if the corner part of the frame is not an acute angle but rounded, a straight edge material is sewn to the position where it reaches the curved corner part, and an edge material is provided at the curved corner part. However, it is difficult to apply tension to the tension at the corner, and the tension becomes slack and the tension becomes insufficient. There is a risk that it will escape because it is simply pushed.

  Therefore, along the almost entire periphery of the stretched area including the round curved corner portion of the frame (at least the vertical side portion of the frame, the upper side portion of the frame, and both end portions of the lower side portion), Although it is conceivable to sew one edge material continuously along the edge of the tension fabric while forcibly bending one edge material, it is also possible to provide an edge material on the curved corner portion. If it is used, an eye mark (also called a match mark) cannot be attached on the way, so there is a possibility that the quality may vary due to overstretching or lack of cords, without knowing how far to sew. There is. Further, when the edge member is folded back and pushed into the tension attachment groove, there is a problem that it is difficult to fit the edge member without bending at the corner.

  In the case of pre-molding one annular synthetic resin edge material that matches the frame shape using a mold (Patent Document 2), the above-mentioned problems are solved, but the mold cost is required, etc. Another problem with increased costs arises.

  On the other hand, as disclosed in Patent Document 3, a resin locking plate that is divided in the length direction from the linear portion before and after the corner portion at the entrance portion and the exit portion of the curved corner portion is used. Although it is possible to make it easier to push in, it is possible to bend in the width direction of the locking plate. It ’s difficult. That is, since the locking plate divided into small parts is forcibly bent and bent in the width direction, the repulsion of the locking plate is strong, and the angular end of the locking plate jumps out of the groove to expand the angle. To stand up, it looks bad.

  The above-mentioned problem is not limited to the curved corner portion that becomes the boundary portion between the vertical piece and the horizontal piece of the frame that fixes the upholstery, but also occurs at a place where it is difficult to fit the upholstery.

  Therefore, the present invention can be applied to a place where it is difficult to fit by folding the edge of the stretched area together with a locking member such as a curved corner portion even if a linear resin cord or the like that is commercially available is used as the locking member. An object of the present invention is to provide an upholstery locking structure that can be pushed into a cable.

  In order to achieve such an object, the invention according to claim 1 is characterized in that an elongated plate-like locking member is attached to the edge of the stretch fabric and the edge is folded back together with the locking member to form a groove in the frame. The locking member is used by combining a plurality of locking members having different mechanical properties, and the bending elastic modulus is applied to the edge of the tensioned portion where the tension is easily applied. A locking member having a smaller bending elastic modulus than the locking member where the tension is applied is provided at the edge of the portion where the locking member is difficult to fit in the groove.

  Further, in the upholstery locking structure of the present invention, the frame is a back frame having a curved corner portion as a place where the locking member is difficult to be fitted, and the upholstery mounting groove facing the outer peripheral direction is formed on the periphery of the back frame. A locking member that is formed along the backrest surface and that has a width dimension larger than the thickness dimension is sewn to the periphery of the tension fabric, and the locking member and the periphery of the tension fabric are folded back and engaged with the tension attachment groove. By pressing in the width direction of the stop member, the tension is stretched and fixed on the surface side of the frame.

  Further, according to the tentering structure of the present invention, the eye mark is provided at the boundary between the section where the tension of the tensiment is easily applied and the section where the tension is relatively difficult, and one straight line is provided for each section divided by the eye mark. In addition, a type of locking member having different mechanical properties is attached to each of adjacent sections with an eye mark therebetween.

  Further, in the tension structure locking structure of the present invention, the hard-to-fit places are separated from each other on the same frame, and the tension is relatively weaker than the tension is applied to the section between the hard-to-fit parts. Locking members provided at places where it is difficult to fit are continuously sewn to the places.

  Here, a plurality of locking members having different mechanical properties have different widths, and a wide locking member is used at a portion where tension is easily applied. It is preferable to use a locking member having a narrower width than a locking member at a portion where tension is easily applied to a place where the fitting is difficult.

  In addition, multiple locking members with different mechanical properties have different thicknesses. Thick locking members are used in areas where tension is likely to be applied, and the locking members are relatively hard to apply tension. It is preferable to use a locking member that is thinner than a locking member at a site where tension is easily applied to a difficult portion.

  In addition, a plurality of locking members with different mechanical properties are made of different materials, and a locking member made of a material with a large bending elastic modulus is used at a portion where the tension is easily applied. It is preferable to use a locking member made of a material having a lower bending elastic modulus than a locking member at a portion where tension is easily applied to a place where the locking member is difficult to fit.

  According to the first embodiment of the present invention, a tension member having a large bending elastic modulus is used at a portion where tension is easily applied, and a bending elastic modulus is small at a position where the tension member is relatively difficult to apply and the locking member is difficult to fit. Since the locking member is used, it is difficult to fit the locking member, for example, at a curved corner, the locking member is fitted and folded into its roundness, and at other locations where the force is applied, deformation of the locking member is small and the groove is pulled out of the groove. It becomes difficult.

  Therefore, in the case of the upholstery locking structure of the present invention, the bending elastic modulus of the locking member is small at a place where the locking member is difficult to be fitted while securing sufficient support strength and fixing strength to the frame as the whole upholstery. Therefore, since the locking member is soft and easy to become familiar with, even if it is bent in the width direction and pushed in, the repulsion of the locking member is weak and the angular end of the locking member does not jump out of the groove, so that it looks good. .

  In addition, even in places where it is difficult to fit, such as curved corners, the edge of the tensioning fabric is pushed into the tensioning groove by reinforcing the locking member, so that it is easy to apply force to push the tensioning fabric, jigs and tools The edge of the upholstery can be pushed into the upholstery groove without using. Moreover, even in a curved corner, tension can be applied to the tension, and the tension does not become loose and does not become insufficient. Even if force is applied to the tension, the edge of the tension is not There is no easy escape.

  In particular, a wide locking member is used in a portion where tension is likely to be applied, and a locking member that is narrower than the locking member in a portion where tension is easily applied to a portion where it is relatively difficult to apply tension and the locking member is difficult to fit. When used, even if a strong force is applied to the upholstery, if the width of the locking member is wide, it is difficult to rotate in the groove and the upholstery is difficult to come off. On the other hand, if the locking member width is narrow, it will be soft and familiar, so it will easily deform along the shape of the groove and will not easily repel, so it can be pushed neatly into the groove without incurring popping out of the groove It becomes possible. The same applies to the case where the thickness of the locking member is changed or the material is changed.

  Furthermore, since a plurality of locking members having different mechanical properties are used in combination, an eye mark can be attached to the boundary of the section where the locking member is attached. Therefore, since it can be easily determined how much and how much to sew, there is no possibility that the tension will be excessively stretched or the locking members will be insufficient, resulting in variations in quality. In other words, the quality can be made constant by providing each of the locking members having different mechanical properties in the section divided by the eye mark.

  In addition, since a commercially available linear locking member such as a resin cord can be used, the cost can be reduced as compared with the case where one annular edge member matched to the frame shape is molded in advance using a mold. It can be greatly reduced.

It is a rear view which shows one Embodiment of the tension fabric for implementing the latching structure of the tension fabric concerning this invention. It is an enlarged view which shows the relationship between the edge part of the tension fabric of FIG. 1, and a locking member. It is a perspective view which shows one Embodiment of a back frame provided with the groove | channel for tension fabric attachment. It is explanatory drawing which shows the relationship between the edge part of a tension fabric, a latching member, and the groove | channel for tension fabric attachment of a back frame. It is a perspective view which shows an example of the chair to which the latching structure of the tension place concerning this invention is applied. It is a front view which shows one Embodiment of the back frame which applies the latching structure of the tension place concerning this invention.

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

  FIG. 1 to FIG. 4 show an example of an embodiment of the upholstery locking structure of the present invention. It should be noted that the upholstery locking structure according to the present invention is for attaching a upholstery that can exhibit appropriate elasticity and tension constituting the body support surface to the frame, such as a chair seat or back. Although the present invention can be applied to all body support structures, the present embodiment will be described by taking as an example a case where the present invention is particularly applied to the attachment of a tension fabric to a back frame of a chair. Further, in the present specification, the upper and lower sides, the front and rear sides (or the depth direction with respect to the back frame), and the left and right sides are defined on the basis of the seated person sitting on the seat. The front surface means the surface in contact with the seated person, that is, the front surface in the case of the back frame, and the upper surface in the case of the seat frame.

  As shown in FIG. 5, a general chair includes a leg 1 having casters, a main frame (not shown) that is attached to and supported by the upper end of a support of the leg 1, a seat 2 supported by the main frame, and The back 3 is provided.

  Here, the back 3 to which the upholstery locking structure according to the present invention is applied includes a back frame 4 that is cantilevered by the main frame and a upholstery 5 that is stretched over the back frame 4. The locking members 6, 7 having a width dimension larger than the thickness dimension and having a certain degree of flexibility and rigidity are attached to the edge portion 5 e of the tension fabric 5, and the peripheral edge portion 5 e of the tension fabric 5 is fixed to the locking member 6. 7 and 7, and the locking members 6, 7 are attached to a tension attachment groove (hereinafter referred to as a tension attachment groove) 10 formed along the backrest / body support surface on the outer side of the back frame 4. By pushing in the width direction, the upholstery 5 is stretched and fixed on the front surface side of the frame, so as to constitute a backrest surface and a body support surface. The locking members 6 and 7 are attached to the edge portion 5e of the tension fabric 5, and are fitted in the tension fabric attachment groove 10 on the outer surface in a state where tension is applied and the tension fabric 5 is covered with the back frame 4. When the tension is applied, the tension is applied to the tension attachment groove 10 by the tension of the tension fabric 5 and functions as a retaining member to fix the tension fabric 5 to the back frame 4. In other words, in a state where the locking members 6 and 7 are fitted in the tension fabric mounting groove 10, the tips of the locking members 6 and 7 that are pulled by the tension applied to the tension fabric 5 are hooked on the wall of the groove and the retaining function is achieved. Make it work. For this reason, the locking members 6 and 7 are formed of a material having a hardness that is not easily bent so as not to come out from the state of being fitted in the tension attachment groove 10. Therefore, as the locking members 6 and 7, a material having a certain degree of hardness and bending plasticity, for example, a thermoplastic resin, a metal thin plate having malleability such as iron, aluminum alloy, copper, or the like can be used. Among them, it is preferable to use a resin cord which is generally commercially available and is easily available at a relatively low cost. In the present embodiment, as the locking members 6 and 7, resin cords formed of a synthetic resin having a predetermined hardness, such as polypropylene (hereinafter, the locking members are simply referred to as resin cords) are used. ing.

  As shown in FIGS. 3 and 6, the back frame 4 of the present embodiment has a substantially rectangular ring shape composed of vertical side portions 4 a on both the left and right sides and horizontal side portions 4 b and 4 c arranged above and below. However, the corner portion 11 connecting the vertical side portion 4a and the upper and lower horizontal side portions 4b, 4c is configured to form a curved curve. Further, the outer surface of the back frame 4 has a tension attachment groove 10 for fitting and fixing the edge portion 5e of the tension fabric 5 facing the outer peripheral direction to the periphery of the back frame 4 over almost the entire length, for example, the back frame 4 is provided so as to constitute one stretched groove mounting groove 10 having both ends at the lower part (position approaching the lower horizontal side part 4b) and continuous between the vertical side part 4a and the upper horizontal side part 4c. Yes. The tensioning attachment groove 10 functions mainly as a support rigidity as a body support structure such as a chair seat or a back, and is stretched together with the resin cords 6 and 7 in a state where tension is applied to the tensioning fabric 5. The edge 5e of the ground 5 is fitted (see FIG. 4). The upholstery attaching groove 10 is formed at a position closer to the front surface than the back surface of the back frame 4 along the back support surface, so that the upholstery 5 can be extended along the shape of the frame 4. As a result, a stretch fabric can be stretched along the curved shape on the front side of the back frame, and a three-dimensional backrest surface that curves in the front-rear and left-right directions is constructed.

  In addition, although the tension | tensile_strength attachment groove | channel 10 can be carved in the back frame 4 itself by cutting, for example, or it can shape | mold integrally at the time of metal mold | die formation, depending on the case, two members shape | molded separately from each other may be used. It may also be formed by connecting face to face with a certain gap. For example, at the position on the lower horizontal side portion 4b of the back frame 4, a groove is formed continuously with the stretch fabric mounting groove 10 formed between the vertical side portion 4a and the upper horizontal side portion 4c in relation to die cutting. 3, the cover plate 15 is put on the front surface of the lower horizontal side portion 4b and screwed as shown in FIG. 3, so that it is not shown between the cover plate 15 and the lower horizontal side portion 4b. A gap that functions as a tensioning groove is formed. Therefore, at both ends of the stretch fabric mounting groove 10, a part of the front side edge (bank) portion of the back frame that defines the stretch fabric mounting groove 10 is cut away, and the cover plate 15 on the lower lateral side portion 4 b side is cut. The resin cord 6 and the upholstery edge 5e are provided so as to be guided in a gap functioning as a upholstery attaching groove formed on the back surface side. As a result, the edge 5e on the lower side of the upholstery 5 and the resin cord 6 continuously extend from the upholstery mounting groove 10 on both sides of the back frame 4 to the upholstery mounting groove (not shown) on the back side of the cover plate 15. It is inserted. Incidentally, since the corner portion 14 on the lower end side of the back frame 4 is covered with the cover plate 15 and is hidden by the seat 2, the resin cord 6 is forcedly bent into the tensioning attachment groove on the back surface of the cover plate 15. Even when the end of the resin cord 6 is repelled and the edge is bulged and the angle is raised when it is pushed in, it does not appear in the appearance and does not deteriorate the appearance.

  In the upholstery locking structure according to the present invention, the resin cord is used in combination with a plurality of resin cords 6 and 7 having different mechanical properties, and at the edge corresponding to the locations 12 and 13 where the tension is easily applied to the upholstery 5. Is provided with a resin cord 6 having a high bending elastic modulus, that is, a resin cord 6 that secures the rigidity of the resin cord sufficient to prevent the edge of the upholstery 5 from falling out (from coming out of the groove 10). Resin cords having a lower bending elastic modulus than the resin cords 6 in the portions 12 and 13 where tension is easily applied to the edge corresponding to the corner portion 11 of the back frame 4 in the present embodiment, for example, a portion that is difficult to fit in the tension attachment groove 10 That is, the resin cord 7 that is easy to bend in the cord width direction and is easy to become familiar with the groove 10 is provided. Here, in this specification, the “location where tension is easily applied” refers to an area centered on a location where strong tension is applied, and does not include a location where the tension is not relatively applied and the resin cord is difficult to fit. In this sense, “the place where the edge of the resin cord and the tension fabric is difficult to fit into the groove” refers to an area centered on the place where the resin cord is relatively difficult to apply and the tension is clearly not strong. It is used to the extent that it does not include such parts. In this embodiment, an example using two types of resin cords 6 and 7 is given, but depending on the case, three or more types of resin cords having different mechanical properties may be used.

  Specifically, in the present embodiment, the two types of resin cords 6 and 7 having different mechanical properties have different cord widths, and as shown in FIGS. The resin cord 6 having a wide cord width W1 is used for 12 and 13, and the resin cord 7 having a width W2 narrower than that of the resin cord 6 is used for the portion 11 where it is relatively difficult to apply tension and the resin cord is difficult to fit. More specifically, the portion 12 such as the lumbar portion where the tension is large is provided with sufficient rigidity of the resin cord to prevent the edge of the tensioned fabric 5 from being bent (exiting from the groove 10) when the tension is applied. In order to secure, a resin cord 6 made of polypropylene having a thickness of 2 mm and a width of 11 mm is sewed, and it is easy to bend in the cord width direction at a corner portion 11 that is relatively difficult to apply tension and difficult to fit into the groove, for example, a curved corner portion 11 (Easy) Polypropylene resin cord 7 having a thickness of 2 mm and a width of 9 mm is sewn. If the cord width becomes extremely short, there is a risk that the edge will swell up in the groove 10 when the tension is applied to the upholstery 5 and come out of the groove 10, but a polypropylene resin having a cord width W2 of about 9 mm. If it is a code | cord, it can be compatible with the flexibility of the code | cord | chord width direction which adapts to groove shape, and the rigidity of the grade which does not swell easily. However, since a tension is hardly applied at a place where a stretched place such as a substantially right corner portion is difficult to be fitted, a resin cord having a code width of several mm that is easily adapted to the shape of the groove 10 may be adopted. Even in this case, it is possible to easily apply a force of pushing the resin cord into the tension material, and to push the edge of the tension material into the tension material mounting groove 10 without using a jig or a tool. In this embodiment, the resin cords 6 and 7 are sewn to the peripheral edge portion 5e of the tension fabric. However, the present invention is not limited to this, and depending on circumstances, the resin cords 6 and 7 may be attached by bonding or welding. . Further, in the present embodiment, the resin cord 6 having a relatively wide cord width W1 as a portion 13 where tension is easily applied to a part of the upper horizontal side portion 4c between the curved corner portions 11 of both shoulders of the back frame 4 is provided. Is sewn on the upholstery 5, but the upper lateral side 4c may have a tension structure that requires a relatively small tension compared to the portion 12 where a large tension is applied, such as a lumbar part. In this case, the resin cord 7 having a narrow width W2 that can be easily fitted into the upholstery mounting groove 10 in the entire region from the corner portion 11 of both shoulders to the upper horizontal side portion 4c may be used by continuously sewing. In other words, in the tensioned structure, there are places where hard-to-fit parts are spaced apart on the same frame, and there are places where relatively weak tension is applied compared to where tension is applied to the section between these hard-to-fit parts. In this case, the resin cord provided in the place where it is difficult to fit may be continuously sewn as it is. Of course, it is better to use two types of resin cords 6, 7 or three or more types of resin cords with different mechanical properties in accordance with the distribution of the tension intensity applied to the tension fabric. Needless to say, the fixed strength of the upholstery can be obtained.

  In the present invention, the resin cords 6 and 7 are not limited to a specific material or form, but it is preferable to use linear resin cords having a certain degree of rigidity and flexibility. Such resin cords 6 and 7 are commercially available as a linear resin cord and can be easily obtained. For example, a polypropylene resin cord (trade name: polypropylene sun allomer PB170) manufactured by Sun Allomer Co., Ltd. may be used. It can be implemented.

  As a preferable aspect of the resin cords 6 and 7, the resin cords 6 and 7 have a thickness T 1 that can be inserted into the stretch fabric mounting groove 10 including the thickness of the stretch fabric 5 and are larger than the groove width W of the stretch fabric mounting groove 10. The width dimension (short direction orthogonal to the longitudinal direction of the resin cords 6 and 7) W1 and W2 at least can be mentioned. In other words, the groove width W and the groove depth of the upholstery mounting groove 10 are determined in relation to the thickness T1 of the resin cords 6 and 7 and the cord widths W1 and W2, and the folded edge 5e and the resin cord The groove width W is such that 6 or 7 can be inserted under a slight gap, and has a sufficient depth to accommodate the edge 5e of the stretched fabric 5 folded together with the resin cords 6 and 7. According to the resin cords 6 and 7, as shown in FIG. 4, the edge 5e of the tension fabric 5 is folded back so that the resin cords 6 and 7 are wrapped by the edge 5e of the tension fabric. Since a slight gap is formed between the groove 10 and the inner surface in the groove width direction, the work of pushing the resin cords 6 and 7 into the tension attachment groove 10 can be easily performed.

  Here, when a tension is applied to the upholstery 5, a force for rotating the resin cords 6 and 7 within the upholstery attachment groove 10 is generated. However, since the resin cords 6 and 7 have the width dimensions W1 and W2 set to be larger than the groove width W of the upholstery attachment groove 10, the upholstery attachment groove is rotated to some extent within the upholstery attachment groove 10. Further contact with the groove surface 10 is prevented from rotating further. Therefore, it is possible to maintain the state where the resin cords 6 and 7 are wrapped in the edge portion 5e of the tension fabric 5 and to prevent the resin cords 6 and 7 from coming out of the tension fabric mounting groove 10. Become. That is, it is possible to realize a structure in which the stretch fabric 5 does not come off the back frame 4 while the stretch fabric mounting groove 10 and the resin cords 6 and 7 have a relatively simple structure. Further, if the resin cords 6 and 7 are prevented from coming out of the upholstery attaching groove 10 by means of retaining means such as irregularities, claws and protrusions on the groove side and / or the resin cords 6 and 7 side, It is more preferable in securing the locking strength.

  The resin cords 6 and 7 do not change the function of fixing the back frame 4 to the tensioning groove mounting groove 10 even if the resin cords 6 and 7 are sewn to either the back side or the front side of the tensioned fabric 5, but preferably It is to sew along the edge of the surface which becomes the back side of the tension fabric 5. In this case, the resin cords 6 and 7 are encased in the upholstery edge when the resin cords 6 and 7 are fitted into the upholstery mounting groove 10 of the back frame 4 just by turning the edge of the upholstery together once. In the stretched state, it fits in the upholstery mounting groove 10. As a result, only the edges of the tensioned fabric to be filled are exposed, so that the appearance is clean. Of course, if necessary, the resin cords 6 and 7 may be sewn on the surface side of the upholstery. In this case, the resin cords 6 and 7 are exposed in the upholstery attaching groove 10 only by turning back once. However, if turned back twice, the resin cords 6 and 7 are covered with the edge of the upholstery and hidden.

  In addition, an eye mark 8 is provided at the boundary between the portions 12 and 13 where the tension of the peripheral edge 5e of the upholstery 5 is easily applied and the portion 11 where the tension is relatively difficult to be applied. Specifically, in this embodiment, an eye mark 8 is provided at the boundary between a section where the tension of the stretch 5 is likely to be applied and a section where the tension is relatively difficult, and one straight line is provided for each section divided by the eye mark 8. The resin cord 6 or 7 is sewn and a resin cord of a different mechanical property is attached to each adjacent section with the eye mark 8 therebetween. The eye mark 8 is a triangular notch on the tension side and defines the sewing start position and the sewing end position of the resin cords 6 and 7, so that the resin cord 6 or 7 corresponding to the corresponding section is used as a guide. If the sewing is performed, the position where the resin cords 6 and 7 are sewn can be made constant without causing the stretch 5 to be stretched or contracted during sewing. Accordingly, the resin cord 6 having a wide width W1 is sewn with the suture thread 9 in the sections 12 and 13 where the tension is easily applied with the eye mark 8 as a mark, and the section 11 where the insertion is difficult such as a curved corner portion is narrow. A resin cord 7 having a width W2 is sewn with a suture thread 9. In this case, it is possible to clearly determine how much and how much to sew with the eye mark 8 as a mark, and it is sufficient to sew a relatively short section as compared with the case where one resin cord is sewn on the entire circumference. The quality variation such as excessive stretching of the upholstery 5 and lack of resin cords is almost eliminated. Here, the resin cords 6 and 7 may be sewn so as to be in contact with each other with no gap at the portion of the eye mark 8, or about 1 to 5 mm, for example, to the extent that the tension fabric 5 does not come off from the tension fabric mounting groove 10. You may make it sew and leave a gap. Note that the eye mark 8 is not limited to a triangular cutout, and may be a cutout of another shape, or may be a round or polygonal hole, or a mark such as a simple line pattern. good.

  In addition, the upholstery 5 is not limited to a specific shape. In the present embodiment, the four corners having a slightly wider width and a slightly longer height than the back frame 4 are substantially arc-shaped. It is formed in a rectangle. The material of the upholstery 5 is a material that can exhibit appropriate elasticity and tension as the back 3 or the seat 2 in a state of being stretched between the back frames 4 (in other words, a stretchable material). It is not limited to a specific thing, For example, the mesh sheet | seat made from polyester, various resin films, fabric, a nonwoven fabric etc. are used.

  According to the tension ground locking structure configured as described above, a simple tension in which the resin cords 6 and 7 provided on the tension ground 5 are pushed into the tension attachment grooves 10 provided on the back frame 4. By the installation work, the tension can be locked and fixed to the frame 4 while applying a desired tension to the upholstery 5. That is, as shown in FIG. 4, each edge portion 5e of the stretch fabric 5 is simply inserted into the stretch fabric mounting groove 10 provided on the outer surface side of the back frame 4 together with the resin cords 6 and 7. The tensioning work 5 can be fixed to the back frame 4 by applying a desired tension to the tensioning cloth 5. In particular, when it is stretched over a portion where it has been difficult to fit the stretch fabric in the conventional stretch fabric locking structure, for example, the curved corner portion 11 of the spine 3, it is folded back together with the stretch fabric edge 5e. If the resin cord 7 is forcibly pushed into the upholstery mounting groove 10 of the back frame 4 while being forcibly pushed in, the resin cord 7 deforms along the shape of the upholstery mounting groove 10 of the corner portion 11 and the The edge 5e can be fitted again. The resin cord 7 pushed into the upholstery mounting groove 10 has a small bending elastic modulus and fits into the upholstery mounting groove 10 so that it does not repel. Therefore, the end of the resin cord jumps out of the groove 10 and is stretched. The ground 5 is not inflated with a corner. Thus, the upholstery 5 is fixed to the annular back frame 4 while applying a certain tension.

  In addition, the tension | tensile_strength 5 in the lower horizontal side part 4b of the back frame 4 is fixed in the vicinity of the location where the back frame 4 is being fixed to the main frame, and the resin cord 6 is not provided in part. Are provided so as to be pushed into a gap / tension ground mounting groove formed between the back frame 4 and the cover plate 15. However, in this vicinity, since it is an area below the back support point of the spine 3, since it does not apply strong tension and is hidden behind the seat 2, the end of the resin cord 6 is temporarily repelled to lift the tension Even so, there is no hindrance in terms of appearance and fixing force of the tension.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the above-described embodiment, the case where the upholstery locking structure of the present invention is applied to the attachment of the upholstery 5 to the back frame 4 of the chair has been described as an example. However, the chair to which the present invention can be applied. Is not limited to the office chair as in the present embodiment, but can be applied to the fixing of the frame and the tension in a chaise longue such as a sofa, for example, and the appropriate elasticity and tension constituting the backrest surface and the seating surface. The present invention can be applied to all kinds of chairs having a structure in which a upholstery that can exhibit the above is attached to the frame.

  In the above-described embodiment, the case where the upholstery locking structure of the present invention is applied to a structure in which the upholstery attachment groove 10 is provided in the back frame itself and the upholstery 5 is fixed is described as an example. However, the present invention is not particularly limited to this, and it may be a structure for fixing the tension fabric 5 by providing the tension fabric attachment groove 10 on a member different from the frame like a chair described in JP 2007-130341 A, The structure is not limited to a specific frame structure as long as the structure is fixed to the tension-attachment groove 10 by fitting the edge of the tension cloth so as to be folded back with the resin cord sewn to the edge.

  Further, in the present embodiment, an example in which the tension structure is applied to the back of the chair has been described. However, members and places to which the present invention can be applied are not limited thereto, and other bodies You may apply to support structures, such as a seat, an armrest, a headrest, a lumbar support.

  Moreover, in this embodiment, the resin cord 6 of 11 mm cord width W1 is attached to the area | region between the corner parts 11 of the both ends of the upper horizontal side part 4c of the back frame 4, and tension applied to the tension | tensile_strength 5 is strong force However, the present invention is not particularly limited to this, and in some cases, the entire region of the upper horizontal side 4c including the corner 11 may be locked with the resin cord 7 having a width of 9 mm. That is, in the embodiment of FIG. 1, the resin cord 7 having a small bending elastic modulus that is fitted in the vicinity of the corner portion 11 of the back frame 4 and the resin cord 6 having a large bending elastic modulus that is fitted to other regions. However, the present invention is not limited to this, and the 9 mm wide resin cord 7 fitted to the entire upper horizontal side including the corners at both ends, and the left and right frame vertical sides 4a It is also possible to use a three-piece combination with a resin cord 6 having a large bending elastic modulus that is fitted in a region extending from the lumbar support portion to the lower lateral side portion 4b of the back frame 4. In short, if the resin cord 6 having a large bending elastic modulus attached to the edge of the portion where the tension of the upholstery 5 is easily applied and the resin cord 7 having a small bending elastic modulus attached to the edge of the portion difficult to be fitted are used in combination, The effect as the present invention can be exhibited.

  Further, in the present embodiment, an example in which the mechanical property value of the resin cord is changed by using the resin cords 6 and 7 having different cord widths is mainly described, but the present invention is not limited to this. For example, even if the resin cords 6 and 7 of the same width and the same material are used, the bending elastic modulus is changed by changing the thickness, one is difficult to be removed from the groove 10, and the other is easily deformed along the groove 10 and conforms to the groove shape. It is also possible. Furthermore, by making the material of the resin cords 6 and 7 different, the resin cord 6 at the portion where the tension is applied is hard to be pulled out with a relatively high bending strength and hard, and the resin cord 7 at the portion where it is difficult to fit is relatively bent. It is also possible to make it easy to deform along the shape of the groove 10 of the back frame 4 and to become familiar with it as having low strength. Although not shown, in some cases, the resin cord 6 can be used as a resin cord that is easily bent in the width direction by making a notch or a notch in the width direction to partially narrow the cord width. It is. Furthermore, by changing the cord width, changing the thickness, changing the material itself, making a notch or notch in the width direction and partially changing the cord width, etc. It is also possible to change the mechanical property value by carrying out.

3 Back 4 Back frame 5 Upholstery 5e Edge of upholstery 6 Resin cord as a locking member with a large bending elastic modulus provided at the edge of the place where tension of the upholstery is easily applied (wide resin cord)
7 Resin cord (resin cord with a narrow width) as a locking member having a smaller bending elastic modulus than the locking member where the tension is applied to the edge of the portion difficult to fit in the groove
8 Eye mark 9 Suture 10 Tensile attachment groove 11 Place where the tension is relatively difficult and the resin cord as the locking member is difficult to fit (corner part)
12 Places where tension of tension is easy to apply (lumbar support part)
13 Places where tension of tension is likely to be applied (sections sandwiched between corners on both ends of the upper horizontal side)

Claims (7)

In the structure in which an elongated plate-like locking member is attached to the edge of the tension fabric and the edge is folded together with the locking member and fitted into a groove formed in the frame to lock the tension fabric. The locking member is a combination of a plurality of cords having different mechanical properties. The locking member is provided with a locking member having a large bending elastic modulus at the edge of the tensioned portion where the tension is easily applied, and the locking member is fitted in the groove. A tension structure locking structure comprising a locking member having a bending elastic modulus smaller than that of the locking member to which the tension is applied at an edge of a difficult portion. The frame is a back frame having a curved corner portion as a place where the locking member is difficult to be fitted, and the groove for attaching the stretched fabric facing the outer peripheral direction is formed along the backrest surface on the periphery of the back frame. The locking member having a width dimension larger than the thickness dimension is sewed on the periphery of the stretch fabric, the lock member and the periphery of the stretch fabric are folded back, and the width of the lock member is inserted into the tension attachment groove. 2. The upholstery locking structure according to claim 1, wherein the upholstery is tightly fixed to the surface side of the frame by being pushed in a direction. An eye mark is provided at a boundary between a section where the tension of the tension fabric is easily applied and a section where the tension is relatively difficult to be applied, and one linear locking member is sewn for each section divided by the eye mark, The tension structure locking structure according to claim 1 or 2, wherein a locking member having a different mechanical property is attached to each section adjacent to each other with an eye mark therebetween. The portion where the hard-to-fit portion is present on the same frame is separated, and the portion where the tension is relatively weaker than the portion where the tension is applied to the section between the plurality of hard-to-fit portions is provided in the hard-to-fit portion. 3. The upholstery locking structure according to claim 1, wherein the stop member is continuously sewn. The plurality of locking members having different mechanical properties are different in width from each other, and a wide locking member is used at a portion where the tension is easily applied. The tension structure locking structure according to any one of claims 1 to 4, wherein a locking member having a narrower width than that of the locking member in a portion where tension is easily applied to the portion is used. The plurality of locking members having different mechanical properties are different in thickness from each other, and a thick locking member is used at a portion where tension is easily applied. The tension structure locking structure according to any one of claims 1 to 5, wherein a locking member having a thickness smaller than that of the locking member at a position where tension is easily applied to the portion is used. The plurality of locking members having different mechanical properties are made of different materials, and a locking member made of a material having a large bending elastic modulus is used at a portion where the tension is easily applied. The tension member according to any one of claims 1 to 6, wherein a locking member made of a material having a bending elastic modulus smaller than that of the locking member in a portion where tension is easily applied to a portion where the member is difficult to be fitted. Stop structure.