JP2022076314A - Chair spread cloth fitting structure - Google Patents

Abstract

To provide a chair spread cloth fitting structure that makes it easy to insert a mesh spread cloth into a spread cloth groove.SOLUTION: There is provided a chair spread cloth fitting structure in which a mesh spread cloth 37(8) comprising a locking member 38(9) at its peripheral edge is inserted into a spread cloth groove 36(18) on a frame body of a seat or backrest of a chair to fix the mesh spread cloth 37(8). The locking member 38(9) is fitted on a front surface of the mesh spread cloth 37(8) along the peripheral edge. By rotating the locking member 38(9) by 360° to the rear surface side of the mesh spread cloth 37(8) and folding back the mesh spread cloth 37(8) to the rear surface side, a portion 46 on the peripheral edge side of a position 44 at which the mesh spread cloth 37(8) is fitted to the locking member 38(9) is covered with the folded mesh spread cloth 37(8) and a portion 45 on the tip side of the position 44 at which the locking member 38(9) is fitted to the mesh spread cloth 37(8) is exposed and inserted into the spread cloth groove 36(18).SELECTED DRAWING: Figure 11

Description

The present invention relates to a mounting structure of a chair upholstery. More specifically, the present invention relates to a mounting structure for mounting a stretch fabric on a seat frame or a back frame using a plate-shaped locking member provided on the edge of the stretch fabric.

Conventionally, in the backrest and seat of a chair, a mesh-like upholstery that the seated person touches (hereinafter referred to as a mesh upholstery in the present specification) is provided in the back frame and a groove provided on the side surface of the seat frame. A method is adopted in which a sewn locking member is wound around the peripheral edge of the back surface, inserted, and stretched (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2011-45573

However, according to this method, the end portion of the mesh upholstery sewn to the locking member is exposed as it is and is inserted into the groove, so that the end portion of the mesh upholstery is successfully inserted at the time of insertion. hard. In some cases, the edge of the mesh upholstery may be inserted into the groove with the edge folded back from the sutured portion. In this case, it takes more time and effort to push the edge of the mesh upholstery protruding from the groove with a jig or the like.

Also, since both the locking member and the mesh upholstery will be inserted into the groove, the thickness of the upholstery to be inserted may change depending on the location, and depending on the condition of the end of the mesh upholstery, the upholstery may be inserted. The difficulty of pulling out the locking piece varies depending on the amount of the locking piece.

Further, when the locking member is to be provided with an ear portion for screwing, the selvage portion protruding outward from the edge of the locking member is outside the perforation in the process of sewing to the mesh upholstery. It is difficult to install in.

It is an object of the present invention to provide a chair upholstery attachment structure in which a mesh upholstery can be easily inserted into an upholstery groove.

The present invention that achieves such an object is to attach a chair upholstery by inserting a mesh upholstery having a locking member on the periphery into a groove for upholstery of a chair seat or a frame of a backrest to fix the mesh upholstery. In the structure, the locking member is attached to the front surface of the mesh upholstery along the periphery, and the locking member is rotated 360 ° toward the back surface side of the mesh upholstery and the mesh upholstery is folded back to the back surface side. The part on the peripheral edge side of the attachment point to the locking member is wrapped in a mesh upholstery, and the tip side of the locking member is exposed from the attachment point to the mesh upholstery and inserted into the upholstery groove. I am trying to do it.

Here, it is preferable that the locking member is sewn on the mesh upholstery.

Further, it is preferable that the locking member is pushed into the upholstery groove opening on the side surface of the back frame or the frame body of the seat frame.

Further, it is preferable that the locking member is attached to the mesh upholstery at the center of the locking member in the width direction.

In addition, the locking member has an ear portion at a position protruding from the edge inside the perforation during sewing, and after the locking piece is inverted and pushed into the upholstery groove, the ear portion is fixed to the frame body. Is preferable.

Further, the locking member has a curved shape along the upholstery groove that opens on the side surface of the corner portion of the frame body, and is fitted into the upholstery groove at the corner portion of the frame body in a state of being rotated 360 °. Is preferable.

Further, the chair of the present invention preferably includes a seat or a backrest to which the upholstery attachment structure of the chair according to any one of claims 1 to 6 is applied.

According to the attachment structure of the upholstery according to claim 1, the locking member sewn on the surface of the mesh upholstery is folded back to the back side, so that the mesh upholstery is rolled up around the attachment position of the locking member. , The tip side (in other words, the edge side of the mesh upholstery) is folded back from the mounting location, and then folded back again (for convenience, by rotating the locking member 360 °), the tip of the locking member is centered. The upholstery is rolled up, and the upholstery inside the sutured part is folded back. At this time, the edge of the upholstery is rolled up and covered with the folded upholstery to adjust the shape of the edge of the mesh upholstery, while a part of the locking member, that is, a part inside the sutured portion is exposed downward. Therefore, it is easy to insert the locking member and the upholstery into the upholstery groove, and the edge of the upholstery does not protrude from the upholstery groove, so that the work of pushing the edge of the upholstery into the groove is unnecessary. Become.

Moreover, since the edge of the mesh upholstery is not exposed on the tip side of the mesh upholstery in the insertion direction, the mesh upholstery does not protrude from the upholstery graben, and the process of pushing it in is unnecessary, making it possible to reduce one step. At the same time, it looks better. Further, since a part of the locking member can be exposed and inserted into the upholstery graben first from the locking member, the work of inserting the edge of the mesh upholstery into the groove becomes easy.

It is a perspective view seen from the front which shows one Embodiment of the chair to which this invention is applied. It is a perspective view seen from the rear lower part of the chair. It is an exploded perspective view seen from the rear lower part of the backrest. It is an exploded perspective view seen from the front upper part of the backrest. It is an enlarged perspective view of the side side part of a back frame. It is explanatory drawing which shows the vicinity of the connection part of the lower side part of a backrest and a back support member in a vertical cross section. It is a front view which shows an example of the mesh upholstery for the backrest. It is a perspective view which shows disassembled the inner shell which constitutes a seat structure, and the seat support member. It is an enlarged vertical sectional view which shows the assembly state of an inner shell and a seat support member. It is a top view which shows an example of the mesh upholstery for a backrest. According to the present invention, it is an explanatory view showing the positional relationship between the upholstery and the locking member until it is inserted into the upholstery groove of the frame body. The member is folded back once (when rotated 180 °), (C) is the state where the locking member is folded twice (when rotated 360 °), and (D) is the locking member in the groove for upholstery of the frame. The state where the edge of the upholstery is inserted is shown respectively. It is an explanatory diagram showing the positional relationship between the upholstery and the locking member until it is inserted into the upholstery groove of the frame by the conventional method. (A) is before folding back the mesh upholstery, and (B) is upholstery. The state in which the locking member and the edge of the upholstery are inserted into the upholstery groove of the frame by turning the ground once (when rotating 180 °) is shown. It is a perspective view which shows one Embodiment of the armrest main body. It is a perspective view seen from the back surface which shows one Embodiment of a pad. It is a cross-sectional view which looks at the tip side of a pad. It is sectional drawing which shows one Embodiment of an armrest.

Hereinafter, the configuration of the present invention will be described in detail based on the embodiments shown in the drawings. In this specification, the front-back and left-right directions are defined centering on the seated person, and "front or front" means the chair and the seated person sitting on the chair in each of the armrest, the seat, and the backrest. Front or forward, and "rear or backward" is also backward or backward for the chair and seated person. Further, the directions orthogonal to the front-rear direction and the horizontal plane are the left-right direction or the width direction for the seated person or the chair in each of the armrest, the seat and the backrest. In the armrest, seat and backrest, the inside is the side facing the vertical surface in the front-back direction passing through the seater side or the center of the chair, and the outside side is the side away from the seater or before and after passing through the center of the chair. The side away from the vertical plane in the direction. Further, "upper" and "lower" are above and below the chair and seated person in the armrests, seats and backrests, respectively, above and below in the vertical plane.

1 to 2 show an embodiment of a chair to which the present invention is applied. As shown in FIGS. 1 and 2, for example, the chair is swingably supported by a leg 1 provided with casters, a main frame 2 supported by the legs 1, and the main frame 2 and interlocked with each other. It has a seat 3, a backrest 4, and armrests 5 fixed to both ends of the rear bridge frame 11 with screws or the like.

The chair of the present embodiment has, for example, a reaction force mechanism using a spring that compresses a spring when the back frame 6 tilts backward to obtain a reaction force, and a seat when the backrest is tilted backward. A weight-sensitive (or sensing-type) reaction force applying mechanism that makes the resistance to back locking proportional (sensitive) to the weight of the user by interlocking so as to lift the rear side of the support member 30 is used in combination.

Here, in the case of the present embodiment, the main frame 2 is rotatably supported by the pedestal (in other words, a gas spring) of the leg 1 in a horizontal plane, while the front is rotatably supported via a pair of left and right front links 41. By being rotatably connected to the bearing portion 34 of the front bridge frame 32 that supports the seat frame 31, and by connecting the bearing portion 25 of the rear bridge frame 11 to the rear bracket 42 via the backrest rotation shaft 43. The seat 3 and the backrest 4 are supported so as to be swingable.

Further, although not shown, the main frame 2 has a built-in reaction force mechanism including, for example, a compression coil spring, and is swingably supported on the rear end side of the main frame 2 with a backrest support member 7 and a main frame. It is provided so as to generate a force for pushing back the backrest 4 in conjunction with the backward tilt of the backrest 4 with the link shaft (not shown) on the front end side of the frame 2.

(Back)
In the case of the present embodiment, the backrest 4 is a back frame 6 forming a front-view rectangular frame with an empty space inside, and a mesh upholstery stretched over the back frame 6 to form a backrest surface. It is composed of 8 and is swingably mounted on the main frame 2 via a backrest support member 7. In the case of the backrest 4 in the present embodiment, the back frame 6 is used as the frame body to which the mesh upholstery 8 is attached.

In order to ensure the mechanical rigidity of the structure, the back frame 6 is preferably molded of a synthetic resin having rigidity such as reinforced nylon containing glass fiber such as PA6-GF (polyamide 6).

As shown in FIGS. 3 and 4, for example, the back frame 6 in the present embodiment is formed in a shape (that is, a dogleg shape) that is substantially forward-convex in a side view and is generally in a plan view. It forms a frame that is curved so as to be convex toward the rear, and the inside of a rectangular shape that is almost vertically long when viewed from the front is hollow. Here, the lower side portion 20 forming the lower side as a frame body is located at a corner portion that bends in front of the back frame 6 having an L-shaped side view, and the lower side portion 20 and the back frame 6 protruding forward from the lower side portion 20 are located. The connecting portion 21 forms a U-shape that surrounds the back frame mounting portion 12 of the backrest support member 7, and is firmly inserted into the back frame mounting portion 12 so as to be sandwiched between the left and right sides and the back surface. The structure is adopted so as to be connected to the back frame mounting portion 12.

Further, the lower side portion 20 is provided with a contact surface 17 protruding toward the space inside the frame on the rear end side. The contact surface 17 is composed of a curved surface curved in the front-rear direction, and presses the mesh upholstery 8 stretched over the front side of the back frame 6 so as to project to the rear side.

Further, a flange groove 22 into which the flange 13 of the back frame mounting portion 12 is inserted is formed in the back mounting seat 10 on the front surface of the lower side portion 20. A vertical rib 23 that crosses the groove is formed in the middle of the flange groove 22 (that is, a flange groove 22 is formed intermittently), and the vertical rib 23 is used to screw the back frame mounting portion 12. A female screw 24 is provided. On the other hand, the flange 13 of the back frame mounting portion 12 is provided intermittently in the circumferential direction so that the flange 13 can be inserted into the flange groove 22 without interfering with the vertical rib 23 provided in the flange groove 22. It is formed. That is, the lower side portion 20 of the back frame 6 also serves as a portion fitted to the back frame mounting portion 12 of the backrest support member 7.

On the other hand, the backrest support member 7 has a rear bridge frame 11 and an annular back frame mounting portion 12 (a rectangular frame having an empty space inside). The rear bridge frame 11 is a wing-shaped frame that extends to the left and right and curves upward, and together with the rear annular back frame mounting portion 12, creates a space under the seat at the rear of the seat 3. This makes it possible for the meshes and cushions constituting the seat structure (not shown) to bend in the vertical direction without interfering with each other.

Further, in the center of the rear bridge frame 11, a bearing portion 25 for oscillatingly connecting the backrest rotation shaft 43 of the bracket 42 at the rear end of the main frame 2 by inserting the bearing portion 25 and hanging diagonally downward and forward. It is provided with an arm portion 26 that supports and supports one member of the spring-type backrest reaction force mechanism (not shown), and one of the spring-type backrest reaction force mechanisms when the backrest 4 tilts backward. It is provided to form a spring-type backrest reaction force mechanism that pushes the member forward. Further, on the upper surfaces of both ends of the rear bridge frame 11, a mounting portion, that is, a bracket 28 for swingably mounting the bracket 33 behind the outer frame 31 is provided. A flange 13 for inserting the back frame 6 from the rear is formed on the outer peripheral surface of the back frame mounting portion 12 so as to surround the back frame mounting portion 12 so as to project rearward and to the left and right sides. .. In this way, the backrest support member 7 includes the rear bridge frame 11, the bearing portion 25, the arm portion 26, the back frame mounting portion 12, the seat frame mounting portion (bracket 28), and the seat portion (bracket 28) for mounting the armrest 5. It is a recess that can be screwed, and is hereinafter referred to as an elbow mounting seat 29), and has a rational structure that is integrated into one.

Therefore, the flange groove 22 formed in the back mounting seat 10 on the front surface of the lower side portion 20 forming the bottom base of the back frame 6 is fitted to the flange 13 of the back frame mounting portion 12 of the backrest support member 7. By being screwed together, the back frame 6 and the backrest support member 7 are integrated into a continuous L-shaped side view. For screwing, for example, by screwing a screw (not shown) from the inside of the annular back frame mounting portion 12 toward the outside back mounting seat 10, the back frame mounting portion 12 and the back frame 6 (that is, the back mounting seat 10) are screwed. ) Is being linked. That is, the U-shaped back mounting seat 10 protruding forward of the back frame 6 and the back frame mounting portion 12 are connected and integrated without showing screws in appearance. As a result, in the present embodiment, the backrest support member 7 and the back frame 6 are continuously configured to have an L-shaped side view and a neat appearance.

In the present embodiment, the mesh upholstery 8 is attached to the frame body by providing a locking member 9 as a core material on the peripheral edge of the mesh upholstery 8, while the direction of the tension applied to the mesh upholstery 8 on the frame body side. A groove (hereinafter referred to as a stretched groove 18) for inserting the edge of the mesh stretched 8 opened in the changed direction, preferably in the opposite direction, and the locking member 9 is provided, and the stretched groove 18 is mesh-stretched. This is done by inserting and hooking the ground 8 and the locking member 9. Here, as the locking member 9, for example, a flat plate-shaped polypropylene cord having a thickness of about 1 mm and a rectangular cross section (generally called a PP cord) can be used. This flat plate-shaped PP cord having a rectangular cross section is relatively hard in the width direction (longitudinal direction) and exhibits flexibility in the thickness direction (short direction). However, the locking member 9 is not limited to the above-mentioned PP code. In the present embodiment, the locking member 9 is arranged and sewn along the peripheral edge of the mesh upholstery 8 so as to be arranged vertically in the upholstery groove 18 together with the mesh upholstery 8 (that is,). The PP cord is inserted (with the width direction indicating rigidity as the insertion direction into the groove). The mesh upholstery 8 has a desired tension by a heat set (meaning that a mesh upholstery portion whose peripheral edge is fixed by a back frame or a seat frame is heat-treated to give a desired tension by heat shrinkage). Is given.

In the case of the backrest 4, a groove 18 for upholstery is provided on the outer side surface and the bottom side of the upper side 6a and the side side 6b of the back frame 6, and the mesh upholstery 8 is inserted while applying tension to the back frame 6. The mesh upholstery 8 is fixed.

Here, in the case of the present embodiment, the upholstery groove 18 of the lower side portion 20 forming the bottom of the frame body is not formed in the back frame 6 itself, but is formed in the lower back mesh mounting member 14 of another member. It is provided so as to be attached to the lower side portion 20 of the back frame 6 via the lower back mesh mounting member 14. In the case of the present embodiment, as shown in FIG. 6, the lower back mesh mounting member 14 has, for example, a substantially U-shape in cross-sectional shape, and is addressed so as to cover the back surface of the lower side portion 20 under the contact surface 17. It is fixed. The edge of the mesh upholstery 8 and the locking member 9 are inserted and fixed to the inner surface of the lower back mesh mounting member 14 facing the back surface of the lower side portion 20 after being folded back once or twice. A ground groove 15 is provided. Further, a hole for screwing the fastening screw 16 screwed from the front side of the lower side portion 20 is provided on the front surface of the lower back mesh mounting member 14, that is, the surface facing the back surface of the lower side portion 20, and the mesh upholstery 8 is provided. The lower back mesh mounting member 14 is connected to and integrated with the back frame 6 in a state of being inserted into the upholstery groove 15. Therefore, the lower end portion of the mesh upholstery 8 stretched on the front surface of the back frame 6 is sandwiched between the back surface of the lower side portion 20 and the back surface of the contact surface 17, and in the vicinity of the plate surface 17, FIG. As shown, it is addressed to the back surface side of the plate surface 17 to form a curved surface without corners.

As shown in FIG. 7, the locking member 9 of the backrest 4 of the present embodiment has a first cord 9a fitted in a region including an upper side 6a of the back frame 6 and corner portions 6c at both ends thereof, and a back frame 6. It is divided into four parts, a second code 9b and a third code 9c fitted on both sides, and a fourth code 9d fitted on the lower side (bottom side) of the back frame. Further, in the mesh upholstery 8 for the backrest, a cut (not shown) is made along the end face of each cord at the boundary portion of each of the first to fourth cords 9a to 9d, and each cord 9a to 9d is cut. It is provided to allow the folding back.

The first code 9a forms a substantially U-shape similar to the contour shape of the back frame 6 which is a frame including the upper side 6a of the back frame 6 and the corner portions 6c at both ends thereof, and forms the upper side 6a of the back frame 6. It is provided with a substantially straight portion along the line and a corner portion 9e having a curved shape along the upholstery groove 18 that opens on the side surface of the corner portion 6c. The first cord 9a is sewn along the edge to the surface of the mesh upholstery 8.

On the other hand, the second and third cords 9b and 9c are inserted into the upholstery groove 18 on the side surface 6 of the back frame 6 which is substantially straight. Here, in the case of the backrest 4, the mesh upholstery 8 may be easily torn at the outer edge portion of the side side 6a which may collide with a relatively hard substance such as a surrounding furniture such as a top plate of a chair. .. In order to prevent this, at the outer edge portion of the side side 6a of the back frame 6, a material that functions as a cushioning material, for example, an elastomer material, is provided between the mesh upholstery 8 outside the upholstery groove 18 and the back frame 6. It is preferable to intervene.

Therefore, in the case of the present embodiment, the second and third cords 9b and 9c have a known PP cord with an elastomer having an insertion portion that functions as a locking member and an elastomer portion that functions as a cushioning member (for example, Japanese Patent Application Laid-Open No. 2020-6230, etc.) has been adopted. Although not shown, the insertion portion is made of a synthetic resin having a hardness such that it is easy to push in when inserted into the upholstery groove 18 and does not easily bend so as not to come out of the fitted state, for example, polypropylene (for example, polypropylene). Formed by PP). On the other hand, as the elastomer portion, it is preferable to use a material such as an olefin-based thermoplastic elastomer that is interposed between the mesh upholstery 8 and the side 6b of the back frame 6 and functions as a cushioning member against a collision of an object from the outside. Since it is preferable that the elastomer material and the locking member are integrated in terms of handling, for example, a resin cord in which the insertion portion and the elastomer portion are integrated by two-color extrusion molding (that is, with an elastomer) is attached. It is formed as a PP code). In this case, the elastomer portion is folded back while the insertion portion, which is a locking member, is inserted into the groove of the back frame 6, and between the mesh upholstery and the front surface of the back frame outside the upholstery groove 18. Since it is arranged so as to be sandwiched between the elastomer parts, the elastomer part raises the mesh upholstery. Therefore, as shown in FIG. 5, the side side 6a of the back frame 6 from the edge of the groove 18 for the upholstery to the front side of the back frame 6 is recessed so as to be lower than the peripheral surface by the amount of the elastomer portion. 19 is formed. As a result, even if the elastomer part is interposed between the mesh upholstery and the back frame, there is no step between the surface of the surrounding back frame, and both in terms of design and when touched. I am trying to reduce the sense of discomfort.

Here, according to the second and third cords 9b and 9c made of the locking member with the elastomer portion, when the surface of the mesh upholstery 8 is sewn and then folded back twice (rotated by 360 °), the elastomer portion is formed. Since it is arranged inside on the back surface side of the mesh upholstery, the elastomer portion is inserted into the upholstery groove 18. Therefore, in the second and third cords 9b and 9c, the insertion portion (the portion of the locking member) is arranged on the outside and the elastomer portion is arranged on the inside along the peripheral edge of the back surface of the mesh upholstery 8. It is attached by being sewn to 8. Then, it is folded back once (180 ° rotation) at the boundary portion between the insertion portion (the portion of the locking member) and the elastomer portion, and the insertion portion (the portion of the locking member) and the mesh upholstery 8 are placed in the upholstery groove 18. It is designed to be inserted into.

Further, in the case of the present embodiment, the fourth cord is attached via the lower back mesh mounting member 14 fixed to the bottom side portion 20 of the back frame 6, for example, as shown in FIG. In the case of the present embodiment, the central portion of the lower back mesh mounting member 14 is gently curved backward when viewed from below. Therefore, the upholstery groove 15 formed on the inner surface of the lower back mesh mounting member 14 and the fourth cord 9d inserted therein are also gently curved rearward as a whole. Therefore, the fourth code 9d is sewn on the surface of the mesh upholstery 8 in the same manner as the first code 9a, and is folded twice so as to be curved in the same direction as the upholstery groove 15 of the lower back mesh mounting member 14. I try to plug it in. Then, for example, the back frame 6 is covered with the lower back mesh mounting member 14 on the back side of the back mounting seat 10 of the back frame 6 with the mesh upholstery and the PP cord 9 inserted, and screwed from the front. It is fixed to.

According to the mounting structure of the mesh upholstery configured as described above, the first cord 9a sewn on the surface of the mesh upholstery 8 is folded back to the sewn portion of the first cord 9a (that is,). , The mesh upholstery 8 is rolled up around the attachment point) 44, and the tip side portion (in other words, the edge side of the upholstery) 8e is folded back from the sewn portion 44 (see FIGS. 11A and 11B). ). Then, by further folding back to the back side, the mesh upholstery 8 is rolled up around the tip of the first cord 9a (in other words, the edge side of the mesh upholstery 8), and the mesh upholstery inside the sewn portion 44. 8 is folded back (see FIG. 11 (C)). At this time, the veranda portion 8e of the mesh upholstery 8 is caught in the folded portion, and a part of the first cord 9a, that is, a portion 45 inside the sewn portion 44 is exposed and exposed. Therefore, the locking member, the first cord 9a, and the mesh upholstery 8 can be easily inserted into the upholstery groove 18, and the edge of the mesh upholstery 8 does not protrude from the upholstery groove 18, so that the mesh is stretched. The work of pushing the edge of the ground 8 into the groove 18 becomes unnecessary. The same applies to the fourth code 9d.

Here, except for exceptional locking members such as the locking member with an elastomer portion (that is, the second and third cords 9b, 9c), the locking member 9, particularly the first cord 9a having the corner portion 9e. In this case, it is important that the locking member 9 is attached to the mesh upholstery 8 on the surface side of the mesh upholstery 8. When the locking member 9 is attached to the back surface side of the mesh upholstery 8 by sewing or the like, the locking member such as the first cord 9a including the corner portion 9e is wrapped with the mesh upholstery along the locking member. It will not be in the shape of a shape. That is, a locking member such as the corner portion 9e cannot rotate 360 ° in the first place and cannot be fitted into the upholstery groove. Further, even if the locking member is linear, even if the locking member is rotated by 360 ° while folding back the mesh stretched fabric, the entire locking member is wrapped in the mesh stretched fabric 8, so that the mesh stretched fabric 8 is used. Is doubled and the thickness is only increased, and a part of the locking member shown in the present embodiment is exposed and easily fitted into a groove for upholstery such as a terminal structure that functions as a guide. Cannot be obtained. Further, since the entire locking member is wrapped in the mesh upholstery 8, there is a problem that a protruding portion, for example, an ear portion 39 cannot be formed on the edge of the locking member.

In the case of the mounting position of the locking member 9 and the mesh upholstery 8, that is, in the case of sewing, the sewing position 44 is not limited to the center position in the width direction, and can be carried out at a position closer to the veranda or a position away from the edge. Therefore, the effect of facilitating the insertion of the mesh upholstery 8 into the upholstery groove 18 is not lost. Further, when the sewing portion 44 of the first cord 9a to the mesh upholstery 8 is set to the center position in the width direction of the cord 9a, the cord 9a is folded back by a distance corresponding to the width of one cord in two folds. Therefore, the end portion of the first cord 9a, that is, the end of the corner portion 9e is arranged at the same position as when the second and third cords (PP cords with elastomer) 9b and 9c are folded back once. Therefore, in the folded state, the corner portions 9e at both ends of the first cord 9a and the ends of the second and third cords 9b and 9c are at the same position, that is, there is a discrepancy in the cord positions in the upholstery groove insertion direction. It disappears. Further, since the corner portions 9e at both ends of the first cord 9a forming an inward curve are returned to the original curved state by rotating 360 °, the curved shape of the upholstery groove 18 of the back frame 6 (with the upper side 9a). It has a shape along the corner portion 9c) between the side side 9b and can be inserted into the upholstery groove 18 of the back frame 6. Therefore, there is no possibility that the mesh upholstery 8 will come off at the corner portion 9e.

(Seat structure)
In the case of the present embodiment, the seat 3 includes a mesh upholstery 37 forming a seat surface, an annular inner shell 35 to which the mesh upholstery 37 is attached, and an outer shell 31, as shown in FIGS. 8 and 9, for example. It is composed of a support member 30, and is mounted on the main frame 2 so as to be swingable by the front link 41 of the main frame 2 and the backrest support member 7 via the seat support member 30. In the case of the seat 3 in the present embodiment, the inner shell 35 and the outer shell 31 as the frame body to which the mesh upholstery 37 is attached are formed by placing the inner shell 35 on the outer shell 31 and screwing it from below. It is assembled.

The seat support member 30 of the present embodiment is not limited to a specific structure and shape, but is, for example, an annular outer shell (a rectangular frame having an empty space inside) 31 and the front of the outer shell 31. It has a front bridge frame 32 for supporting the outer shell 31 and a bracket 33 for connecting a position slightly rearward from the middle of the outer shell 31 to the backrest support member 7, and a bearing portion in the central portion of the front bridge frame 32. The 34 is swingably connected and supported by the front link 41 of the main frame 2, while the bracket 33 on the rear side of the outer shell 31 is connected to the bracket 28 of the backrest support member 7 by a rotation shaft (not shown). It is supported swingably. Therefore, the seat 3 is linked to the movement of the backrest 4.

The front bridge frame 32 is a wing-shaped frame that extends to the left and right and curves upward, and together with the rear bridge frame 11 of the backrest support member 7 and the back frame mounting portion 12, creates a space under the seat (FIG. 1). And FIG. 2 and FIG. 8). This makes it possible for the mesh upholstery 37 to bend in the vertical direction without interfering with the main frame 2. It also has the effect of making it look lighter in design.

Here, the mounting position of the bracket 33 behind the outer shell 31 with respect to the rear bridge frame 11 is provided in front of the backrest rotation shaft 43 of the rear bridge frame 11, and when the backrest support member 7 tilts backward. The seat support member 30 (that is, the seat 3) is in a position where it can be lifted. That is, the seat 3 is lifted with the backward tilt of the backrest 4, and a part of the weight of the seated person acts as a resistance to the backward tilt of the backrest 4 (rocking resistance is weight-sensitive). It is provided so as to constitute a force applying mechanism (or a weight-sensitive reaction force applying mechanism).

The attachment of the mesh upholstery 37 to the inner shell 35 in the seat 3 of the present embodiment is the same as in the case of the backrest 4 described above, for example, the mesh upholstery provided with the locking member 38 such as the PP cord along the peripheral edge. 37 is fitted into the upholstery groove 36 formed on the outer peripheral side surface of the inner shell 35 together with the locking member 38. In the case of the seat 3, a mesh tensioning groove 36 is provided on the front side 35a, the left and right side sides 35b and the rear side 35d of the inner shell 35, and the side surface facing the outside of the corner portion 35c between them. It is fixed by inserting it while applying tension to the ground 37.

Further, as shown in FIG. 10, the locking member 38 has a first cord 38a fitted in a region including a front side 35a of the inner shell 35 and corner portions 35c at both ends thereof, and left and right side sides of the inner shell 35. It is divided into four parts, a second code 38b and a third code 38c fitted into the 35b, and a fourth code 38d fitted in a region including the rear side 35d of the inner shell 35 and the corner portions 35c at both ends thereof.

The first cord 38a has a substantially U shape similar to the contour shape including the front side 35a of the inner shell 35 and the corner portions 35c at both ends, and is sewn along the edge on the surface of the mesh upholstery 37. Has been done. On the other hand, the second and third cords 38b and 38c are substantially linear and are sewn along the edge to the surface of the mesh upholstery 37. Further, the fourth cord has a substantially U shape similar to the contour shape including the rear side 35d of the inner shell 35 and the corner portions 35c at both ends thereof, and is formed along the edge on the surface of the mesh upholstery 37. It is sewn. In the case of the present embodiment, corner portions 38e are included at both ends of the first code 38a and the fourth code 38d, but the present invention is not particularly limited to this, and for example, corners are provided on the sides of the second and third codes 38b and 38c. The portion 38e may be included, or in some cases, only the corner portion 38e may be made independent as a locking member. Further, depending on the case, each end of each of the first code 38a to the fourth code 38d may include a corner portion 38e.

As shown in FIG. 12, the conventional method of attaching the locking member (PP cord) to the upholstery is to sew on the back surface of the mesh upholstery 37 along the edge of the upholstery. Then, the mesh upholstery 37 is folded back once so as to wrap the locking member 38, and then inserted into the upholstery groove 36 (see FIG. 12B). However, according to this method, if the mesh upholstery portion 37e ahead of the sewn portion (that is, the attachment portion) 44 floats away from the locking member 38, it may be difficult to enter the upholstery groove 36 well or in some cases. Is inserted into the groove 36 in a state where the edge 37e on the tip side of the stitched portion 44 of the mesh upholstery 37 is folded back, and further, there is a problem that it cannot be inserted. Further, when the portion raised from the locking member 38 protrudes from the upholstery groove 36, it is necessary to use a jig or the like to fit it in the upholstery groove, which increases the number of work steps. There is.

Further, in the curved locking member, that is, the corner portion 38e, when the locking member is rotated once, the curved shape of the corner portion 38e is outward (the direction of the curve is reversed), and the upholstery is stretched. There is a problem that the locking member 38 cannot be used because it cannot enter the groove 36. Therefore, in the corner portion 38e, only the mesh upholstery 37 is used, so it is necessary to use a jig to push the mesh upholstery in the corner portion into the upholstery groove. For this reason, there is a problem that it is necessary to take time and work to push the mesh upholstery in the corner portion into the upholstery groove in order to improve the appearance. Moreover, since there is no locking member and only the mesh upholstery is pushed in, there is a problem that the mesh upholstery is easily removed.

Therefore, in the present embodiment, the locking member 38 is sewn on the surface of the mesh upholstery 37 along the peripheral edge, and the locking member 38 is first folded back to the back surface side of the mesh upholstery 37 and then the mesh upholstery. At 37, the locking member 38 is folded back once (for convenience, folded back twice) so as to wrap around the locking member 38, and then inserted into the upholstery groove 36.

The above-mentioned first to fourth cords 38a, 38b, 38c and 38d are sewn on the surface side of the mesh upholstery 37 by sewing. Then, a notch parallel to the end of the resin cord is made in the upholstery located at the boundary between the first to fourth cords 38a, 38b, 38c and 38d so that the cords can be folded back. It is provided.

In the case of the seat of the present embodiment, the cords 38a, 38b, 38c and 38d are folded twice (the cord is rotated 360 °) for each cord 38a, 38b, 38c and 38d on the back surface side of the mesh upholstery. A part of the above is wrapped with the mesh upholstery 37, and the tip side portion 45 of each cord 38a, 38b, 38c and 38d is exposed from the sewn portion 44 to the mesh upholstery 37, and is used for the upholstery while being exposed. It is inserted into the groove 36. That is, as shown in FIG. 11, while the cord 38 sewn on the surface side of the mesh upholstery 37 and the mesh upholstery 37 make two rotations, the mesh upholstery 37 is folded back from the sewn portion 44 as a starting point. Further, since it is wound around the edge of the base end side portion 46 of the cord 38, it is inserted into the upholstery groove 36 in a state where the tip end side portion 45 of the cord 38 is exposed. Therefore, at the edge of the upholstery groove 36, the folded mesh upholstery 37 is formed so as to cover the proximal end side portion 46 outside the sewn portion 44 of the cord 38 and the edge 37e of the mesh upholstery. As a result, the shape of the edge of the mesh upholstery 37 is arranged. Moreover, since the edge 37e of the mesh upholstery 37 is not exposed on the tip side of the mesh upholstery 37 in the insertion direction, the mesh upholstery 37 does not protrude from the upholstery groove 36, and the step of pushing the mesh upholstery 37 becomes unnecessary. It is possible to reduce the number of processes and improve the appearance. Further, since a part of the cord, that is, the tip side portion 45 is exposed, the cord 38 can be inserted into the upholstery groove 36 first, and the edge 37e of the mesh upholstery 37 is inserted into the upholstery groove 36. Work becomes easier. Further, even in the corner portion 38e which is a locking member curved inward (toward the center of the upholstery), the corner portion 38e is returned to the original curved state by rotating the cord 38 and the mesh upholstery 37 by 360 °. Therefore, the shape follows the curved shape of the upholstery groove 36 of the inner shell 35 (the corner portion 35c between the front side 35a and the side side 35b) and can be inserted into the upholstery groove 36 of the inner shell 35. .. Therefore, there is no possibility that the mesh upholstery 37 will come off at the corner portion 38e. The same applies to the corner portion 38e of the fourth code 38d.

Further, since the external force / load applied to the seat 3 is larger than that of the backrest 4, the cords 38a, 38b, 38c and 38d for the seat are screwed to prevent the mesh upholstery from coming off. It is preferable that the selvage portion 39 for the purpose is formed. The position of the selvage 39 is arbitrary and may be provided at any place of any cord, but in particular, the selvage 39 is formed at both ends of the first cord 38a and the fourth cord 38d, that is, at the ends of the corner portions 38e. Is preferable. The selvage portion 39 is provided on the inner edge when the cords 38a, 38b, 38c and 38d are sewn to the mesh upholstery 37. The cords 38a, 38b, 38c and 38d are sewn on the front surface of the mesh upholstery, folded back twice to the back surface side, and then inserted into the upholstery groove 36, so that the selvage 39 protrudes toward the inside of the frame. do. Therefore, as shown in FIG. 11D, the selvage portion 39 is fixed to the inner shell 35 by screwing, for example, a fastening screw 40 from the lower surface side of the inner shell 35 while the selvage portion 39 is inserted into the upholstery groove 36. Will be done. This selvage portion 39 is arranged in a direction away from the edge of the mesh upholstery 37 (inward) when sewing the cords 38a, 38b, 38c and 38d along the edge of the mesh upholstery 37. , It does not interfere with sewing machine sewing and does not reduce work efficiency. In this embodiment, the screwing of the selvage portion 39 of each cord is just in case (to increase the load capacity of the seat), and may not be provided in some cases. Further, the selvage portion 39 is not limited to the locking member 38 for the seat, and may be provided on the locking member 9 for the back in some cases. Further, the method of fixing the selvage portion 39 to the inner shell 35 is not limited to the screw fastening described above, and may be tacker fixing or other fixing means.

In the case of the present embodiment, the method of attaching the locking members (for example, PP cords) 9, 38 to the mesh upholstery 8, 37 is limited to a specific method as long as it can be attached so as to be inverted. Other methods such as gluing, welding, etc. are possible, but preferably sewn, as well as sewn.

In the case of the present embodiment, the armrest 5 is composed of an aluminum die-cast armrest body 60 and a synthetic resin pad 50 attached to the upper surface thereof, as shown in FIGS. 1 and 16, for example. Of course, the materials of the armrest body 60 and the pad 50 are not particularly limited to those described above, and it goes without saying that they are appropriately selected. In this embodiment, an example of applying a fixed armrest in which the position, height, orientation, etc. of the armrest is fixed to the chair will be mainly described, but the present invention is not particularly limited to this, and the position and height of the armrest are not particularly limited. Needless to say, it may be applied to a movable armrest whose orientation is variable.

When the pad 50 is attached to the armrest body 60 by screwing, at least the thickness corresponding to the length of the screw fastening portion is required, so that the pad 50 or the armrest body 60 is inevitably thickened, and the design There is a problem that it makes you feel uncomfortable. Design is also important for office chairs these days, and chairs with a simple and clean appearance tend to be preferred, so the design of armrests is also required to be thin.

On the other hand, in the case of a mounting structure in which the pad 50 is fixed to the armrest body 60 by hooking it with a claw or the like, if the pad material is flexible, it may be easily disengaged by applying a force in the turning direction. There is. That is, the pad 50 of the armrest is the place where the seated person's finger touches most, and may come off due to mischief or the like. In addition, if a strong force is applied, it may easily come off. For example, if you try to lift your body from the chair while grasping or pushing down near the front end of the armrest, the entire weight of the seated person will act as a force to move forward (sliding force) on the pad, so the pad will slip or fall off. There is a risk of getting up.

Therefore, in the case of the present embodiment, the armrest body 60 and the pad material 50 are fitted and attached without using screws while the pad 50 is slid sideways to be attached to the armrest body 60. There is. Of course, although not shown, the pad 50 may be attached to the armrest body 60 by sliding it in the front-rear direction.

As shown in FIG. 13, for example, the armrest main body 60 of the present embodiment has a side view table shape having an upper side 70, a front side 71, a rear side 72, and a bottom side 73, and the inner side of the armrest has a hollow frame shape. It is screwed to the elbow mounting seat 29 via the portion 74 and supported by the backrest support member 7. Further, the armrest main body 60 is formed with a recess 75 from the upper side 70 to the front side 71 so that a part of the upper surface portion 66 and the inner side wall portion (hereinafter referred to as the inner wall portion 67) is removed. The structure is such that the surface (that is, the top surface) of the armrest is formed by accommodating the pad 50 in the armrest. In the case of the present embodiment, the armrest body 60 is molded by die-casting aluminum, but the material is not particularly limited.

In the case of the present embodiment, the recess 75 is for locking the resin pad 50 to be supported in the width direction of the chair between the outer side wall portion (hereinafter referred to as the outer wall portion 68) of the upper side 70 of the armrest main body 60. The rib 61 is formed. Further, between the outer wall portion 68 of the upper side 70 of the armrest body 60 and the locking rib 61, the middle of the upper portion 51 of the pad 50 is vertically arranged so that a dent does not occur when an external force is applied to the pad 50. At least one bearing rib 62 that supports and supports in the direction is formed. The bearing rib 62 may not be provided in some cases. Needless to say, these ribs 61 and 62 also serve the original role of the ribs to reinforce the decrease in rigidity due to the defect between the inner wall portion 67 and the upper surface portion 66 of the armrest body 60.

The locking rib 61, for example, has a space for supporting the inner side wall portion (hereinafter referred to as the inner wall portion 53) of the resin pad 50 by the bottom portion 69 of the upper side 70 of the armrest body on the outer side of the locking rib 61 (that is, that is). It is installed on the seated side). Specifically, for example, the locking rib 61 is provided at a position deviated outward by about the thickness of the inner wall portion 53 of the resin pad 50 from the inner end of the bottom portion 69 of the armrest main body 60. Of course, the position of the locking rib 61 is not particularly limited to the above, and can be changed as appropriate, but at least a space for supporting the inner wall portion 53 of the resin pad 50 can be secured. preferable. On the other hand, the bearing rib 62 is provided at a position deviated further inward from the locking rib 61. In the case of the bearing rib 62 shown in the drawing, the thickness is formed to be thicker than that of the locking rib 61, but the thickness is not particularly limited to this, and it goes without saying that the thickness or number of the ribs 62 is arbitrary. Further, these ribs 61 and 62 are formed to be lower than the original height of the top surface of the upper side 70 of the armrest body 60 so that the pad 50 fits into the recess 75 of the upper side 70 of the armrest body 60. Specifically, for example, it is formed at a height as low as the thickness of the upper portion 51 of the pad 50 or slightly thinner than that, and when it is attached so as to cover the pad 50, the upper side of the armrest body 60 The resin pad 50 is provided so as to fit in the resin pad 50 so as to swell slightly higher than or equal to the top surface of the 70.

The pad 50 utilizes the fitting of unevenness in the triaxial direction orthogonal to each other as a structure for attaching to the armrest main body 60. For example, a front locking claw 57 is provided at the tip edge portion of the pad 50, a first lateral locking claw 55 is provided on the inner surface side of the inner wall portion 53, and an outer side wall portion (hereinafter referred to as an outer wall portion 52) is provided. A second lateral locking claw 56 is formed on the outer surface side. On the other hand, in the armrest main body 60, the locking rib 61 has a through hole 63 through which the first lateral locking claw 55 projecting outward from the inner wall portion 53 of the pad 50 penetrates, and the outer wall portion 68 has the outer wall of the pad 50. The front locking claw 57 of the pad 50 is fitted into the engaging recess 64 into which the second lateral locking claw 56 protruding outward from the portion 52 is fitted, and further to the front end of the recess 75 leading to the front side 71. A downward engaging recess 65 is formed. The engaging recess 65 restricts the movement of the front locking claw 57 of the pad 50 to the front side, but is a cavity that allows movement in the width direction at least by the amount of lateral slide for attaching / detaching the pad 50.

The first lateral locking claw 55 is directed from the inner surface of the inner wall portion 53 of the pad 50 to the opposite outer wall surface 52, for example as an integral part of the pad 50 (and thus formed of resin). It is formed so as to protrude. The first lateral locking claw 55 is an elastically deformable protrusion having a return that narrows when passing through the through hole 63, spreads after passing through the through hole 63, and cannot be pulled out from the through hole 63, for example, through. A wedge portion 55c diagonally intersecting the insertion direction into the hole 63, a return portion 55b locked to the edge of the through hole 63 of the locking rib 61, and a leg portion having a length penetrating the locking rib 61. It is composed of 55a and is an elastic deformed body that can be elastically deformed in a direction orthogonal to the insertion direction into the through hole 63 (see FIG. 15). That is, the first lateral locking claw 55 passes through the through hole 63 while narrowing the wedge-shaped return portion 55b, and after passing through the through hole 63, the return portion expands and functions to be caught. House-shaped or mushroom-shaped elastic protrusions.

In the example shown in the figure, the first lateral locking claws 55 are provided at five positions on the inner surface of the inner wall portion 53 of the pad 50 at substantially regular intervals. The number of the first side locking claws 55 is not limited to the example shown in the figure, and it is considered that the engaging force between the pad 50 and the armrest main body 60 can be secured, for example. Then, it is set to an appropriate number.

Further, a rib 58 slightly protruding in the width direction of the armrest is formed at a position substantially in the center between the adjacent first lateral locking claw 55 and the first lateral locking claw 55. .. The rib 58 is composed of, for example, a linear protrusion extending in a direction perpendicular to the upper portion 51 of the pad 50. That is, by alternately forming the rib 58 and the first side locking claw 55, a reaction force is applied to the first side locking claw 55 penetrating the through hole 63 of the locking rib 61. I try to work to absorb the play. The inner side wall portion 53 of the pad 50 that abuts on the rib 58 is attracted by the fitting of the first lateral locking claw 55 between the ribs 58 and the through hole 63, so that the first side wall portion 53 receives a force so as to be slightly bent. A load is constantly applied so that no play occurs between the side locking claw 55 and the through hole 63.

The forming direction of the first lateral locking claw 55 is not particularly limited, but depends on the direction of the through hole 63 formed in the locking rib 61 of the armrest main body 60. For example, when a horizontally long rectangular through hole 63 is provided for the locking rib 61 along the bottom portion 69 of the armrest main body 60, the case of the first lateral locking claw 55 in the illustrated example is used. Is formed so as to project from the inner wall portion 53 of the pad 50 toward the outer wall portion 52 so that the elastic deformation direction is set in the lateral direction. The formation directions of the plurality of first side locking claws 55 may all be the same, and the plurality of first side locking claws 55 are adjusted so as to be able to respond firmly to an external force as a whole. Alternatively, the direction of the external force applied by the portion of the pad 50 may be assumed and adjusted in consideration.

The engaging recess 65 formed on the front side of the armrest body 60 allows the pad 50 to slide in the width direction while the front locking claw 57 at the tip of the pad 50 is fitted, so that there is a clearance in the width direction. Has been held. Further, when the front locking claw 57 is inserted into the engaging recess 65, the pad 50 is inclined to generate a wedge effect at the tip because a force for urging the pad 50 to the rear side is generated between the front locking claw 57 and the armrest main body 60. A surface is provided. Therefore, at the same time that the front locking claw 57 is inserted into the engaging recess 65, the front side of the front locking claw 57 is in close contact with the inner surface of the front side of the engaging recess 65 without a gap in the front-rear direction, and the pad 50 is attached to the rear. A force is applied and the pad 50 is positioned so as not to shift forward.

The pad 50 is engaged with the second lateral locking claw 56 inserted into the engaging recess 64 and the first lateral locking claw 55 inserted into the through hole 63. At the same time, the first lateral locking claw 55 penetrates the through hole 63 while being elastically deformed and then expands again to function as a retaining mechanism for preventing slippage in the width direction, that is, a lateral slide prevention mechanism. On the other hand, in the pad 50, the rear end edge 54 abuts on the wall surface of the recess 75 of the armrest body 60 (the end surface of the upper side 70 exposed by the recess 75), while the front end edge 59 abuts on the wall surface of the engaging recess 65 (by the engaging recess 65). The end surface of the exposed front side 71) is abutted, and the tip-side locking claw 57 is fitted into the engaging recess 65 to function as a retaining mechanism, so that the claws are immovably fixed in the front-rear direction. That is, by fitting the engaging recess 64 and the second side locking claw 56, the pad 50 is engaged in a direction orthogonal to the sliding direction of the pad 50.

Since the engaging recess 64 of the outer wall portion 68 of the armrest body 60 made of die-cast aluminum is a recess that does not penetrate the outer wall portion 68 so as not to spoil the appearance, after cutting or grinding. Formed by processing. Further, since the through hole 63 of the locking rib 61 is a through hole, for example, a rectangular hole, it is formed at the same time as die casting.

The second side locking claw 56 is a so-called protrusion fitted into the engaging recess 64, and by fitting into the engaging recess 64, the armrest main body 60 is formed in a direction orthogonal to the sliding direction of the pad 50. And the pad 50 are engaged with each other. That is, the second lateral locking claw 56 is not limited to a specific embodiment such as the protrusion shown in the figure as long as it serves to prevent the pad 50 from positioning and ascending in the front-rear direction.

In the case of the present embodiment, the second side locking claw 56 and the engaging recess 64 are arranged on substantially an extension of the position where the first side locking claw 55 and the through hole 63 engage. However, the present invention is not particularly limited to this, and an arbitrary position, for example, the engagement position between the first lateral locking claw 55 and the through hole 63 may be arranged so as to be offset in the front-rear direction.

Further, in the example shown in the figure, the first side locking claw 55 and the second side locking claw 56 are provided on the side of the pad 50, and the through hole 63 and the engaging recess 64 are provided on the side of the armrest main body 60. Although it is provided, the arrangement of the first side locking claw 55, the through hole 63, the second side locking claw 56, and the engaging recess 64 is limited to the example shown in the figure. Not done. In addition, the arrangement is not limited to such that the second lateral locking claw 56 is provided on the side where the first lateral locking claw 55 is provided as in the example shown in the figure. .. Specifically, for example, the first side locking claw 55 may be provided on the pad 50 and the second side locking claw 56 may be provided on the armrest main body 60.

In the present embodiment, the first side locking claw 55 and the second side locking claw 56 are provided on the pad 50, while the through hole 63 and the engaging recess 64 are provided on the armrest main body 60 to provide the armrest. The mounting structure is such that it is slid in the width direction and mounted, but the mounting structure is not limited to this, and the first and second lateral locking claws 55 and 56, the through hole 63, and the engaging recess 64 are the armrest main body 60. And the pad 50 may be provided on at least one of them. For example, although not shown, the armrest body 60 is provided with a second lateral locking claw 56 protruding inward, and the outer wall portion 52 of the pad 50 is provided with a recess or a recess for engaging a through hole. Is also good. Of course, the first lateral locking claw 55 may be provided in the armrest body 60 and the through hole 63 may be provided in the pad 50.

The structure for attaching the pad 50 to the armrest body 60 of the present embodiment is detachably provided by a first lateral locking claw 55 that is elastically deformed and engaged with the through hole 63 of the armrest body 60. However, the connection structure is not limited to this and may be a non-disconnectable connection structure.

The first lateral locking claw 55 fitted in the through hole 63 does not easily come off from the through hole 63 of the armrest body 60, but it comes off when pulled by an appropriate force. That is, it is pulled out from the through hole 63 while narrowing the wedge-shaped return portion of the first lateral locking claw 55.

The first side locking claw 55 and the through hole 63 appropriately secure the coupling force between the pad 50 and the armrest body 60, and then the pad 50 is removed from the armrest body 60 as needed, such as when the pad is replaced. It is possible to remove it. That is, the engagement / connection that is removable and difficult to be easily disengaged is realized.

According to the pad mounting structure of the armrest configured as described above, the outer wall portion 52 of the pad 50 is fitted between the outer wall portion 68 of the armrest main body 60 and the support rib 62, and the outer wall portion 52 of the pad 50 is fitted more than the locking rib 61. The pad 50 is placed on the recess 75 of the armrest body 60 so that the inner wall portion 53 of the pad 50 is located inside, and the front locking claw 57 on the front end side of the pad 50 slides inside the engaging recess 65. When the pad 50 is slid in the width direction from the inside to the outside of the armrest 5, the first lateral locking claw 55 of the pad 50 elastically deforms and engages through the through hole 63 of the armrest body 60. At the same time, the second lateral locking claw 56 is engaged with the engaging recess 64 of the armrest body 60 and fixed in the front-back and left-right directions as well as the three-axis directions in the vertical direction.

A positive force is likely to act on the armrest 5 due to the use of the product. However, since the pad 50 does not move forward, there is no risk of it coming off the armrest body 60. Further, since it is fixed without using screws, the pad 50 and the armrest body 60 can be formed thinly.

Therefore, it is possible to prevent the first lateral locking claw 55 from being displaced or deformed and unexpectedly disengaging from the engagement with the through hole 63, which is useful as an engagement structure. It is possible to improve the performance and reliability, and it is possible to improve the safety and comfort of use of the chair with the backrest to which the engagement structure is applied.

Further, in the illustrated embodiment, the pad 50 is attached to the armrest main body 60 by sliding it in the width direction from the inside to the outside of the armrest 5, but the case is not particularly limited to this. Depending on the situation, the armrest 5 may be attached to the armrest body 60 by sliding it in the width direction from the outside to the inside. In this case, the positional relationship between the locking rib 61, the bearing rib 62, the remaining outer wall portion 68, and the first lateral locking claw 55 and the second lateral locking claw 56 of the pad is illustrated. Needless to say, it is symmetrical with respect to the case of the form and the axis in the front-back direction.

Therefore, in attaching the pad 50 to the armrest body 60, the front locking claw 57 at the tip edge portion of the pad 50 is fitted into the engaging recess 65 of the front side 71 of the armrest body 60, while the outer wall portion 68 of the armrest body 60 is attached. The pad 50 is armrested so that the outer wall portion 52 of the pad 50 is accommodated between the support rib 62 and the first lateral locking claw 55 of the inner wall portion 53 is addressed to the through hole 63 of the locking rib 61. By covering the recess 75 of the upper side 70 of the main body 60 and then sliding it laterally, the first side locking claw 55 of the inner wall portion 53 of the pad 50 and the second side locking claw 56 of the outer wall portion 52 The armrest body 60 is fitted into the through hole 63 of the locking rib 61 and the engaging recess 64 of the outer wall portion 68. As a result, the pad 50 is locked in the front-back, left-right, and up-down triaxial directions and fixed to the armrest body 60.

The above-mentioned form of the mounting structure of the mesh upholstery is an example of a preferred form of the present invention, but the present invention is not limited to this, and various modifications can be carried out without departing from the gist of the present invention. For example, in the above-described embodiment, the locking member at the upper side portion of the backrest or the locking member at the front end and the rear end portion of the seat is a locking member in which a straight line portion and a curved corner portion are continuously formed. Although the explanation was given with the example of, the present invention is not particularly limited to this. For example, in the above-described embodiment, the corner portions are included at both ends of the first cord, but the present invention is not particularly limited to this, and the corner portions may be included only at one end or may be included in other cords such as the second and third cords. In some cases, only the corner portions 9e and 38e may be made independent as locking members. In any case, the locking member at the corner portion is provided on the surface of the upholstery, and by folding back twice, the same direction as before the folding is formed, so that the locking member is suitable for the upholstery groove. Further, although an example in which a PP cord with an elastomer is used has been described for the side of the backrest, the present invention is not particularly limited, and for example, a PP cord having no elastomer portion may be used. .. In this case, it is preferable to sew a locking member on the surface side of the mesh upholstery so that the locking member is folded back twice and inserted into the groove. Further, in this case, the corner portion 9c may be included in one end of the first cord 9a and the end of the second or third cords 9b, 9c on the other end side. In the case of the present embodiment, corner portions 38e are included at both ends of the first code 38a and the fourth code 38d, but the present invention is not particularly limited to this, and for example, corners are provided on the sides of the second and third codes 38b and 38c. The portion 38e may be included, or in some cases, only the corner portion 38e may be made independent as a locking member. Further, depending on the case, each end of each of the first code 38a to the fourth code 38d may include a corner portion 38e.

Further, the configuration of the chair to which the present invention can be applied, in particular, the specific shape and mode of each component such as the inner shell 35 or the back frame 6 constituting the frame over which the mesh upholstery is stretched, will be described above. It is not limited to the one in the form, but is appropriately selected based on the purpose and design of the chair.

Further, in the present embodiment, an example using an upholstery made of a mesh material having a high elasticity is described, but the present invention is not particularly limited to this, and for example, a total walnut (inner shell and cushion are covered on the entire surface). It may be applied to the embodiment of covering the back frame 6 or the seat inner shell 35 in the method of wrapping the back frame 6).

Further, the armrest 5 is fixed to the elbow mounting seats 29 at both ends of the rear bridge frame 11 with screws or the like, if necessary. Therefore, when the armrest 5 is not required, the elbow mounting seat 29 is closed with a cover, that is, a cover formed of a surface connected to the outer shell surface of the rear bridge frame 11.

Further, in the above-described embodiment, a weight-sensitive reaction force applying mechanism and a compression spring that generate a force to push back the backrest by raising the seat in conjunction with the backward tilt of the backrest of the chair are used. The chair to which the present invention is applied is not particularly limited to the chair to which the present invention is applied, and the chair to which the present invention is applied is not particularly limited, and the weight-adaptive reaction force applying mechanism and the coil are described. A chair that has only one of the reaction force applying mechanism with a spring, for example, a non-weight sensing type synclolocking mechanism in which the rear end side sinks while the seat moves backward in conjunction with the backward tilt of the backrest, and the back. Needless to say, it can be applied to a locking mechanism in which only the leaning tilts backward, a locking mechanism in which only the seat performs a locking operation, and a chair having no locking mechanism.

1 Leg 2 Main frame 3 Seat 4 Backrest 5 Armrest 6 Back frame 6a Upper side 6b Side side 6c Corner part 7 Backrest support member 8 Mesh upholstery (for backrest)
9 Locking member 9a 1st code 9b 2nd code 9c 3rd code 9d 4th code 9e Corner part 10 Back mounting seat 11 Rear bridge frame 12 Back frame mounting part 13 Flange (back frame mounting part)
14 Lower back mesh mounting member (part of the back frame)
15 Groove for upholstery (of lower back mesh mounting member)
16 Fastening screw 17 Contact surface (back frame)
18 Groove for upholstery (of the back frame)
19 Front recess on the side of the back frame 20 Lower side of the back frame 21 Connecting part 22 Flange groove (for flange 13)
23 Vertical rib (flange groove 22)
24 Female thread (flange groove 22)
25 Bearing part (of backrest support member)
26 Arm part (of backrest support member)
27 Reaction force receiving part (of the backrest support member)
28 Bracket (supports and supports the outer shell)
29 Elbow mounting seat 30 Seat support member 31 Outer frame 32 Front bridge frame 33 Bracket (rear to the seat frame)
34 Bearing part 35 Inner shell 35a Front side 35b Side side 35c Corner part 35d Rear side 36 Groove for upholstery (inner shell)
37 mesh upholstery (for seat)
38 Locking member (for seat)
38a 1st code 38b 2nd code 38c 3rd code 38d 5th code 38e Corner member 39 Ear 40 Screw 41 Front link 42 Rear bracket 43 Backrest rotation shaft 44 Sewn point between locking member and mesh upholstery ( That is, the mounting location)
45 Tip side part inside (opposite edge side) from the sewn part of the locking member 46 Base end side part outside (edge side) from the sewn part of the locking member 50 Pad 51 Upper part (top surface part) of the pad
52 Outer side wall of the pad 53 Inner side wall of the pad 54 Rear edge of the pad 55 First side locking claw 55a Leg 55b Return part 55c Wedge 56 Second side locking claw 57 Front locking Claw 58 Rib 59 Pad front edge 60 Armrest body 61 Locking rib 62 Supporting rib 63 Through hole through which the first side locking claw of the pad penetrates 64 The second side locking claw of the pad fits Engagement recess 65 Engagement recess where the front locking claw of the pad fits 66 Upper surface of the upper side of the armrest body 67 Inner side surface of the upper side of the armrest body 68 Outer side wall of the upper side of the armrest body 69 Bottom of the upper side 70 Upper side of the armrest body 71 Front side of the armrest body 72 Rear side of the armrest body 73 Bottom side of the armrest body 74 Mounting arm part of the armrest body 75 Recessed part of the upper side of the armrest body

Claims (7)

In the mounting structure of the upholstery of the chair in which the mesh upholstery provided with the locking member on the peripheral edge is inserted into the upholstery groove of the seat of the chair or the frame of the backrest to fix the mesh upholstery.
The locking member is attached to the surface of the mesh upholstery along the periphery and
By rotating the locking member 360 ° toward the back surface side of the mesh upholstery and folding the mesh upholstery back to the back surface side, a portion on the peripheral edge side of the attachment portion of the mesh upholstery to the locking member is formed. A chair upholstery characterized in that it is wrapped in the mesh upholstery to be folded back, and the tip side of the locking member is exposed from the attachment point to the mesh upholstery and inserted into the upholstery groove. Mounting structure. The attachment structure for a chair upholstery according to claim 1 or 2, wherein the locking member is sewn to the mesh upholstery. The chair according to any one of claims 1 to 3, wherein the locking member is pushed into the upholstery groove opening on the side surface of the back frame or the frame body of the seat frame. Upholstery mounting structure. The attachment structure for a chair upholstery according to claim 1, wherein the locking member is attached to a mesh upholstery at the center in the width direction of the locking member. The locking member has an ear portion at a position protruding from the edge inside the perforation at the time of sewing, and after the locking piece is inverted and pushed into the upholstery groove, the ear portion is the frame body. The attachment structure of the upholstery of the chair according to any one of claims 1 to 4, wherein the chair is fixed to the sewer. The locking member has a curved shape along the upholstery groove that opens on the side surface of the corner portion of the frame body, and is rotated by 360 ° in the upholstery groove at the corner portion of the frame body. The attachment structure for a chair upholstery according to any one of claims 1 to 5, wherein the chair is fitted in a state. A chair comprising a seat or a backrest to which the upholstery attachment structure of the chair according to any one of claims 1 to 6 is applied.

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