JP7246164B2 - a chair with a backrest and the same - Google Patents

Description

The present invention relates, for example, to chair backs and chairs .

2. Description of the Related Art Conventionally, a chair disclosed in Patent Document 1 below, for example, is known as a chair provided with a load-bearing member that receives a load on a sheet-like face member installed on the backrest or the like of the chair.
In the chair disclosed in Patent Document 1, the peripheral edge of a mesh-like upholstery material, for example, is engaged with the mounting groove formed in the outer surface of the back frame of the backrest portion. This supports the upholstery on the back frame and forms a back support surface. The mounting groove is shielded at the top by an upper cross beam that connects the back frames at their upper edges.
The backrest of such a chair is excellent in that it facilitates the support of the upholstery material with respect to the back frame. There is a concern that the upholstery material may be displaced downward.

On the other hand, in the chair backrest disclosed in Patent Document 2, a flexible sheet is attached to a first engaging portion having an upward surface of a side fitting groove formed on the outer peripheral side of a side member of a back frame member. The downward hook-shaped engaging claws of the side edge members provided on the peripheral edge of the upholstery made of wood are engaged. By adopting this configuration, in the flexible sheet material, the upholstery material that may be displaced downward is directly positioned with respect to the side member to prevent downward displacement.

JP 2011-45574 A JP 2014-45964 A

By the way, in the chair described in Patent Document 2, in order to form the upholstery with a flexible sheet material, the first engaging portion is applied while applying a predetermined tension in the width direction of the chair (the direction in which the side members are separated from each other). and the engaging claw must be engaged in the vertical direction, and such work is difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and provides a backrest and a chair equipped with the same, which can easily restrict displacement of a face member installed between a pair of rods in the longitudinal direction of the rods. intended to

The backrest according to the present invention comprises a pair of side frame rods arranged facing each other with a predetermined interval in the horizontal direction and extending in the vertical direction, an upper frame rod connecting the upper ends of the pair of side frame rods to each other, and a surface member constructed between the pair of side frame rods , wherein the side frame rods extend vertically along the outer edges of the side frame rods and laterally outward. an opening formed at the connection portion between the upper end of the side frame rod and the upper frame rod, the opening facing rearward from the front surface of the side frame rod, and the inner depth portion of the opening . a second engaging recess extending downward from the side frame rod, communicating with the first engaging recess through the outer edge of the upper end of the side frame rod, and along the left-right direction intersecting the first engaging recess ; and a protrusion that forms the second engagement concave portion on the front surface of the upper end of the side frame rod and forms the opening with the upper frame rod, wherein the face member includes the first engagement member. It has a first direction edge that engages with the joint recess and a second direction edge that engages with the second engagement recess, and the second direction edge has a bag shape that engages with the protrusion . It is characterized by having a part.
According to the present invention, the first directional edge of the face member is engaged with the first engaging recess of the pair of rod members, and the bag-shaped portion of the second directional edge is engaged with the second engaging recess. Therefore, the face member can be supported by the pair of rods, and the displacement of the face member in the longitudinal direction of the rods can be restricted.

In addition , since the first engaging recess and the second engaging recess of the rod material communicate with each other, the formation range of the bag-like portion can be set to extend to the vicinity of the side edge portions on both sides of the face member. Therefore, the face member can be engaged with the second engaging recess in a wider range.

In addition , by engaging the bag-shaped portion of the face member with the protrusion of the rod member, a part of the bag-shaped portion is held in the second engagement concave portion in an engaged state. Displacement in a direction can be restricted.

Moreover, it is preferable that the second engaging recess is provided with a holding means for locking the bag-shaped portion.
Since the bag-like portion of the face member can be engaged with the second engaging recess by the pressing means, it is possible to reliably prevent the bag-like portion from disengaging.

Also, the pressing means may be a rim member sewn to the bag-like portion, and the rim member may be fixed to the rod member.
Further, the pressing means may be an edge member sewn to the bag-shaped portion and a pressing member for fixing the edge member to the rod member.

A chair according to the invention is characterized by comprising a backrest as described in any of the above.
When the load-bearing member is installed on the backrest or seat of a chair, it is possible to prevent the face member from being displaced in the longitudinal direction of the rod member even if the load of the seated person is applied to the face member.

According to the backrest and chair according to the present invention, by engaging the bag-shaped portion provided at the second direction edge of the face member with the second engagement recessed portion of the pair of rod members, the face member is held in a predetermined position. It can be easily and easily engaged with the first engaging recess and the second engaging recess of the rod by applying tension. As a result, even if a load is applied to the face member, it is possible to restrict the displacement of the rod member in the longitudinal direction.

1 is a perspective view of a chair according to an embodiment of the invention; FIG. Figure 2 is a view of the back of the chair shown in Figure 1; Figure 2 is a view of the back frame of the chair shown in Figure 1; Fig. 10 is a perspective view of a main portion showing a first engaging recess and a second engaging recess formed in a side frame rod of the backrest; FIG. 4 is a partially enlarged view of the chair according to the first embodiment, in which the side frame rods are fitted with the face members. FIG. 4 shows the upper edge of the face material, (a) is a diagram of edge members sewn on both ends of the front surface, (b) is a diagram of stretchable additional members sewn on the upper edge of the back surface, ( c) is a diagram of a state in which a bag-like portion is formed on the back side of the upper edge portion, and (d) is an enlarged view of the bag-like portion and the edge member in FIG. The edge member is shown, (a) is a front view, and (b) is a side view. is a cross-sectional view of the bag-like portion of the face member in FIG. 6(c) taken along the line AA. The second engagement recess of a side frame rod and an edge member are shown, (a) is an exploded perspective view, (b) is a longitudinal cross-sectional view. FIG. 11 is a perspective view of a main part of a state in which a face member is attached to a second engagement concave portion of a side frame rod; FIG. 13 is a vertical cross-sectional view taken along the line BB of FIG. 12 showing a state in which the bag-like portion of the face member is attached to the second engagement concave portion of the side frame rod; FIG. 12 is a cross-sectional view taken along the line CC of FIG. 11, showing a state in which the bag-like portion of the face member is attached to the second engagement concave portion of the side frame rod; Fig. 10 is a perspective view of a rim member in a chair according to a second embodiment; FIG. 4 is a perspective view of essential parts showing a bag-shaped portion and edge members formed on the upper edge of the face member; FIG. 15 is a cross-sectional view of the bag-like portion in FIG. 14 taken along the line DD. The second engagement recess of a side frame rod and an edge member are shown, (a) is an exploded perspective view, (b) is a longitudinal cross-sectional view. It is a perspective view which shows a pressing member, (a) is the figure seen from the front, (b) is the figure seen from back. FIG. 10 is a perspective view of a main part showing a face member and a pressing member mounted in the second engaging recess of the side frame rod;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, chairs according to embodiments of the present invention will be described with reference to the accompanying drawings.
In the following description of each embodiment, front, back (rear), left, right, and up and down directions refer to directions viewed from a person sitting on a chair unless otherwise specified.
A schematic configuration of a chair 1 according to a first embodiment will be described with reference to FIGS. 1 to 4. FIG. A chair 1 includes legs 2 placed on a placement surface such as a floor, support bases 3 installed on the upper edges of the legs 2, and a seated person's buttocks mounted on the top of the support bases 3. and a seat 4 for supporting the thighs, and a backrest 5 attached to the support base 3 and supporting the back of the seated person on the rear side of the seat 4. - 特許庁

The leg portion 2 includes a multi-limb leg 2b having a caster 2a at its lower end, and a pedestal 2c standing from the central portion of the multi-limb leg 2b. The support base 3 constitutes the main part of the support structure of the chair 1 . The seat 4 has a face member 8 in the form of a mesh sheet, for example, attached so as to cover the upper surface and outer peripheral surface of the support frame supported by the support base 3 . Armrests 6 attached to both sides of the backrest 5 are supported by the support base 3 via the backrest 5, and the elbows of the seated person are placed thereon.

Next, the backrest 5 of the chair 1 will be described with reference to the accompanying drawings.
As shown in FIGS. 2 and 3, the backrest 5 includes a back frame 10 made of, for example, a hard synthetic resin and formed in a substantially square frame shape, and a mesh sheet-shaped stretched on the front surface of the back frame 10. and a face material 11 of
The back frame 10 of the backrest 5 includes a pair of side frame rods 13 arranged facing each other with a gap on both left and right sides, an upper frame rod 14 connecting the upper ends of the side frame rods 13, and the side frame rods 13. and a lower frame rod 15 connecting the lower ends of the two. The side frame rods 13 extend in a direction intersecting the upper frame rods 14 and the lower frame rods 15, for example, in a direction substantially perpendicular to them.

The upper frame rod 14 is retracted rearward from the connecting portion with the side frame rods 13 on both sides, and has an intermediate portion curved in a substantially arc shape, and is arranged behind the face member 11 and the side frame rods 13 as a whole. It is The lower frame rod 15 is formed in a substantially linear shape or a substantially circular arc shape, and a connecting piece 16 for connecting the back frame 10 to the support base 3 is integrally formed on the lower frame rod 15 . The connecting piece 16 is connected by a pair of forward-facing rods 16a extending forward from both sides of the lower frame rod 15 and connecting portions 16b thereof. The connecting portion 16b is a member for connecting the back frame 10 to the support base 3 via a connecting member (not shown).
The side frame rods 13 arranged on the left and right are formed in a substantially V-shape in which the vicinity of the lower end connected to the lower frame rod 15 in the longitudinal direction protrudes forward from the upper and lower ends. There can be no parts. As shown in FIG. 4, each of the side frame rods 13 has a first engaging recess 18 having a substantially U-shaped cross section formed along the longitudinal direction on the outer peripheral side edge thereof. are formed continuously.

As shown in FIGS. 4, 5 and 9, an opening 19a is formed at the upper end of each side frame rod 13 and connected to the upper frame rod 14 from the front to the rear. A second engagement concave portion 19 is formed in a groove shape from the portion toward the lower side of the side frame rod 13 . The second engaging recess 19 communicates the outer peripheral side and the inner peripheral side of the side frame rod 13 . Moreover, the first engagement recess 18 and the second engagement recess 19 are formed to communicate with each other at the outer edge of the upper end of the side frame rod 13 . A notch 19b communicating with a receiving seat 21a, which will be described later, is formed inside the bottom of the second engaging recess 19. As shown in FIG.
5 and 9, a protrusion 13a is formed on the front surface of the upper end of each side frame rod 13, and the thickness of the front side is reduced below the protrusion 13a. A stepped portion 21 is formed so that the width is narrower than that on the back side. The stepped portion 21 communicates with the second engaging recess 19 through a notch 19b at the bottom thereof. Moreover, a receiving seat 21a is formed on the upper portion of the stepped portion 21 so that a tongue portion 23b of the edge member 23, which will be described later, is seated thereon. The receiving seat 21a is formed with an inclined surface portion in the middle in the longitudinal direction, and a screw hole 22 for screwing the edge member 23 is formed below the inclined surface portion. For this reason, the side frame rod 13 has a protrusion 13a forming an opening 19a at the upper end on the front side thereof, a thick portion is formed on the outer side of the protrusion 13a and the lower side of the protrusion 13a, and a step portion 21 is formed on the inner side. A thin portion is formed.

Next, the face member 11 stretched by engaging the back frame 10 at its peripheral portion will be described with reference to FIGS. 6 to 8. FIG.
As shown in FIG. 2, the face material 11 is formed, for example, in the shape of a substantially rectangular mesh sheet, and the material thereof is, for example, a woven fabric or knitted fabric made of polyester twisted yarn. The face member 11 can expand and contract in the width direction between the side frame rods 13 (referred to as the first direction) and the longitudinal direction of the side frame rods 13 (referred to as the second direction). The face material 11 has three side edges consisting of the left and right side edges and the lower edge, and the first engaging recesses respectively formed in the left and right side frame rods 13 and the lower frame rod 15 of the back frame 10 of the backrest 5. It is stretched by engaging with 18 . The upper edge portion of the face member 11 is held as a free end portion 11B that is not engaged with the back frame 10, ie, a free end portion, in a region between left and right bag-shaped portions 27, which will be described later.

The face material 11 is formed as follows. That is, in FIG. 6(a), substantially rectangular notch portions 11a are formed at the left and right corner portions of the upper edge portion of the face member 11 in the unfolded state. A rim member 23 is fixed to the front surface of the face member 11 between the left and right cutouts 11a by, for example, sewing, welding, or adhesion.
The edge member 23 is a plate-like member made of, for example, a hard synthetic resin, and as shown in FIG. 23b and formed in a substantially L shape. An insertion hole 23c for inserting a screw is formed in the tongue portion 23b. The tongue piece 23b has an inclined portion that bends in the middle in the longitudinal direction, and this inclined portion abuts against the inclined surface portion of the receiving seat 21a to prevent the edge member 23 from being displaced upward.
Moreover, the pair of edge members 23 are formed in line symmetry on the left and right.

Further, in FIG. 6(b), a strip-shaped stretchable additional member 24 is fixed by sewing or the like between the left and right notch portions 11a on the back surface (rear surface) of the upper edge portion of the face member 11. As shown in FIG. The width of the elastic additional member 24 is substantially equal to the width of the notch 11a. Then, the front surface of the face material 11 is bent once to the back surface side across the width of the stretchable additional member 24, and is further bent once more in the same direction to form the bent portion 11b shown in FIGS. 6(c) and 8. be in a folded state. The base portion 23a of the edge member 23 and the elastic additional member 24 are wrapped in the bent portion 11b, and the tongue portion 23b is exposed below the bent portion 11b.
In this state, belt-shaped edge reinforcing members 25 are fixed to the back surface of the left and right side edges and the lower edge of the panel 11 by sewing, welding, or the like. The left and right side edges and the lower edge of the face member 11 are reinforced with edge reinforcing members 25, and the bent portion 11b of the upper edge is reinforced by bending the stretchable additional member 24 and the face member 11 twice.

Moreover, the stretchable additional member 24 is a cushioning material (skin material, pad material, core material) that is stretchable in its longitudinal direction and has greater stretchability in the same direction than the surface material 11 . Elastic yarn (for example, "Diaflora" (registered trademark)) made of a single yarn such as polyester elastomer is used as the material, and the elastic yarn is bent into a loop and knitted together to form a belt-like fabric. Cloth. The elastic yarn is stretchable, and by becoming part of the knitting/woven structure, the directionality and degree of stretching are restricted within an appropriate range. Alternatively, the stretchable additional member 24 may be a knitted or woven stretchable fabric obtained by weaving the elastic yarn of a polyester-based elastomer or the like into a polyester-based mesh layer fabric.
The band-like stretchable additional member 24 is for increasing the restorability of the face material 11 and is sewn to the upper edge of the face material 11 . When the seated person repeatedly sits on the backrest 5 and the face material 11 expands and contracts in the width direction, the elastic additional member 24 also expands and contracts integrally in the same direction, and the elastic additional member 24 reinforces the restorability of the face material 11. - 特許庁Improve durability. The stretchable additional member 24 does not hinder or offset the stretchability of the face material 11, and has the characteristic of reinforcing the shrinkage and restoring force of the face material 11 stretched under load. .

The stretchable additional member 24 is connected to the mesh panel 11 by sewing, and since this sewing is performed by combining upper and lower threads using a sewing machine or the like, a space is formed between the two. As a result, the stretchability of the stretchable additional member 24, which is larger than the mesh-like face member 11, is not hindered even by sewing.
The edge reinforcing material 25 is a belt-shaped mesh sheet made of synthetic resin, and is made of, for example, a resin plate. The edge reinforcing member 25 may be non-stretchable or smaller than the face member 11, and when the left and right side edges and the lower edge of the face member 11 are inserted into the first engaging recesses 18 and engaged, the edge reinforcing members 25 Since the strength of the left and right side edges and the lower edge is increased by the reinforcing material 25 , the reinforcing effect is high, and detachment from the first engaging recess 18 can be prevented.

Then, as shown in FIGS. 6(c) and 6(d), the both side ends of the base portion 23a of the edge member 23 are sewn together with the sewn portions 27a and 27b at the left and right ends of the bent portion 11b of the face member 11. , a bag-like portion 27 having an opening downward is formed. When the face member 11 is attached to the backrest 5, the bag-shaped portion 27 is put on the protrusion 13a at the upper end of the side frame rod 13 and locked as shown in FIGS.
When the bag-like portion 27 of the face member 11 is engaged with the protrusion 13a, the tongue portion 23b of the edge member 23 extends downward through the notch 19b of the second engaging recess 19, as shown in FIGS. protrude. The tongue portion 23b is seated on the receiving seat 21a of the stepped portion 21, and the insertion hole 23c is aligned with the screw hole 22. As shown in FIG. Therefore, the upper edge of the face member 11 can be fixed to the side frame rod 13 by screwing a bolt 28 as a fastener into the screw hole 22 through the insertion hole 23c of the tongue piece 23b.

9 shows that the edge member 23 is inserted into the second engagement concave portion 19 alone, in reality, the stretchable additional member 24 and the base portion 23a are attached to the bag-like portion 27 of the face member 11. is enclosed, the tongue portion 23b protruding downward through the notch 19b of the second engaging recess 19 is seated on the receiving seat 21a and fixed with the bolt 28. As shown in FIG.

11 and 12 show the vertical and horizontal cross sections of the bag-like portion 27 and the second engaging recess 19 with the bag-like portion 27 of the face member 11 covering the projecting portion 13a of the side frame rod 13. become. 11 and 12, the second engaging recess 19 communicates with the first engaging recess 18 on the outer side of the upper end of the side frame rod 13, so that the second engaging recess 19 has left and right side edges of the face member 11. A rim and edge reinforcing material 25 is inserted on the rear side, and a bag-like portion 27 of the panel 11 is inserted on the front side thereof.
In addition, the bag-like portion 27 has the stretchable additional member 24 sandwiched between the two layers of the face material 11 that are bent from the back side toward the front side in the second engaging recess 19, and the edge on the frontmost side. A base portion 23a of the member 23 is inserted. Therefore, two layers of the bag-like portion 27 of the face member 11 and the side edge portion of the face member 11 and the edge reinforcing member 25 are tightly fitted in the second engaging recess 19 .

The backrest 5 of the chair 1 according to this embodiment has the structure described above. Next, a method for attaching the panel 11 to the backrest 5 will be described.
As shown in FIG. 6(a), edge members 23 are attached by sewing or the like to the left and right ends between the notches 11a on the front surface of the upper edge of the mesh-like panel 11, respectively. The left and right edge members 23 have mutually symmetrical shapes and arrangements.
Next, as shown in FIG. 6(b), a band-like stretchable additional member 24 is attached to the upper edge of the back surface of the face material 11 by sewing (stitching) or the like. Then, the stretchable additional member 24 is sandwiched between the face members 11 by bending the portion sandwiched between the notches 11 a of the upper edge of the face member 11 once from the front side to the back side. Then, the upper edge portion of the face member 11 is bent once more from the front surface to the back face side, and the base portion 23a of the edge member 23 is sandwiched inside the face member 11 (see FIG. 6(c)).

Then, as shown in FIGS. 6(c) and 6(d), both sides of the base portion 23a of the upper edge portion of the face material 11 folded twice are sewn and separated by sewn portions 27a and 27b. A bag-like portion 27 is formed. The bag-like portion 27 opens downward. Further, band-shaped edge reinforcing members 25 are overlapped and sewn along the left and right side edges of the panel 11 along the side edges. As a result, as shown in FIGS. 6(c) and 6(d), the tongues 23b of the edge member 23 protrude below the bag-like portion 27 on the back side of the face member 11. As shown in FIG. Further, edge reinforcing members 25 are fixed to the left and right side edges and the lower edge of the face member 11 by sewing or the like.

Next, the panel 11 is attached to the back frame 10 of the backrest 5 .
First, the bag-shaped portions 27 formed at the left and right ends of the upper edge of the face member 11 are put on the protrusions 13a at the upper ends of the respective side frame rods 13 and engaged with each other. A portion of the edge member 23 including the base portion 23 a is fitted into the second engaging recess 19 . By putting the bag-shaped portion 27 of the face member 11 over the protrusion 13 a of the side frame rod 13 and engaging the second engagement recess 19 , the edge reinforcing member 25 of the face member 11 is engaged with the first engagement recess 18 . It can be a positioning step prior to engagement.
Then, the face member 11 is turned up to make the tongue portion 23b seated on the receiving seat 21a visible. From this state, as shown in FIGS. 9(a), (b) and 10, the tongue 23b provided inside the edge member 23 passes through the notch 19b at the bottom of the second engaging recess 19 and the side frame rod. 13 protrudes downward from the protrusion 13 a and is seated on the receiving seat 21 a of the stepped portion 21 . By screwing bolts 28 into the insertion holes 23c of the tongue portion 23b and the screw holes 22 of the receiving seat 21a and fixing them, the left and right bag-shaped portions 27 on the upper edge of the face member 11 are attached to the left and right side frame rods 13, respectively. can be fixed.

Next, the left and right side edges of the face member 11 and the edge reinforcing members 25 overlapped and fixed are fitted into the first engaging recesses 18 of the left and right side frame rods 13 and engaged. The edge reinforcing member 25 of the lower edge is also fitted into the first engaging recess 18 of the lower frame rod 15 and engaged. As a result, the upper ends of the face member 11 and the edge reinforcing member 25 enter the second engaging recess 19 and overlap the portions including the stretchable additional member 24 of the bag-like portion 27 and the base portion 23a of the edge member 23. Mate.
As a result, as shown in FIGS. 11 and 12, in the second engaging recess 19, the stretchable additional member sandwiched between the face material 11 and the edge reinforcing member 25 folded twice on the front side of the face material 11 is formed. 24 and the base portion 23a of the edge member 23 located on the front side of the face member 11 are laminated.

Moreover, the receiving seat 21a of the side frame rod 13 has an inclined surface and is formed in the stepped portion 21 recessed from the projection 13a. does not protrude from the side frame rod 13. Further, since the inclined portion of the tongue portion 23b contacts the inclined surface of the receiving seat 21a, the upward displacement of the tongue portion 23b of the edge member 23 is resisted. Moreover, since the tongue portion 23b positioned on the front surface of the side frame rod 13 and the head of the bolt 28 are covered with the face member 11, they are difficult to see from the outside and the design is not spoiled.
The left and right side edges and the lower edge of the face member 11 are engaged with the first engagement recesses 18 formed in the side frame rods 13 and the lower frame rod 15, and the bent portions 11b of the upper edge are engaged with the protrusions 13a at both ends. And the space between the left and right bag-like portions 27 engaged with the second engaging recess 19 is not fixed to the upper frame rod 14 or the like, and becomes the free end portion 11B.

Then, when the chair 1 is used, when the occupant repeatedly sits on the chair 1 and applies a load to the backrest 5, the face member 11 and the stretchable additional member 24 are elastically deformed in the width direction and the vertical direction and stretched, and the load is applied. If you remove it, it will return to its original position. In particular, since the stretchable additional member 24 wrapped in the bent portion 11b is set to have greater stretchability than the face member 11, the stretchability of the bent portion 11b is reinforced, and the free end portion 11B becomes loose over time. It is possible to secure resilience and shape retention that prevent it from being damaged and restore it to its original shape and position.

As described above, according to the chair 1 according to this embodiment, the bag-shaped portions 27 formed at both ends of the upper edge of the face member 11 are put on the projections 13a at the upper ends of the pair of side frame rods 13 to form the second engagement. The left and right side edges of the face member 11 were engaged with the first engagement recesses 18 while engaging the joint recesses 19 . Therefore, even if the seat member's load is repeatedly applied to the face member 11 of the backrest 5, the face member 11 does not move in the vertical direction at a portion spaced apart from the first engaging recess 18, which is the main support means of the face member 11. Displacement can be regulated.
In addition, since the first engaging recess 18 and the second engaging recess 19 provided on the left and right side frame rods 13 communicate with each other, the bag-shaped portions 27 on the left and right of the upper edge of the face member 11 are attached to the face member 11. It can be formed at a position near the side edge. Therefore, the face member 11 can be engaged in a wide range between the protrusions 13a of the left and right side frame rods 13 and the second engagement recesses 19. As shown in FIG.

In addition, since the edge member 23 is provided to hold down the bag-like portion 27 that is inserted into the second engaging recess 19 and engages with the protrusion 13a, it is possible to reliably prevent the bag-like portion 27 from being detached from the side frame rod 13. Moreover, the displacement of the face member 11 can be easily regulated. Moreover, since the tongue portion 23b of the edge member 23 is fixed to the receiving seat 21a of the side frame rod 13 with the bolt 28 from the front side, the bolt 28 can be easily attached. is covered with the face material 11 on the front surface, it is inconspicuous and good in design.

In addition, since the stretchability of the additional stretchable member 24 is set larger than the stretchability of the face material 11 in the width direction and the stretchability of the additional stretchable member 24 is set to be larger than the stretchability of the face material 11 in the width direction, the stretchability of the additional stretchable member 24 is set to be greater than the stretchability of the face material 11 in the width direction. They extend together to suppress the resistance to the body of the seated person. In addition, when the load is removed, the face material 11 can be restored to its initial state with the aid of the stretchable additional member 24, so even if the load is repeatedly applied, it can return to its original shape without leaving any flexure. high durability.
In addition, since the stretchable additional member 24 is sewn to the face member 11, threads can be inserted through stitches of knitted fabric or woven fabric, and the stretchability of the stretchable additional member 24 is not hindered.

Since the stretchable additional member 24 extends to the side edges of the face material 11 in the width direction and is supported by the side frame rods 13 together with the face material 11 , the free end portion 11B of the face material 11 is extreme relative to the side frame rods 13 . It is possible to prevent bending or the like from occurring between the side frame rod 13 and the side frame rod 13 due to the extension. Therefore, it is possible to improve the seating comfort.
Since the base 23a of the edge member 23 in addition to the face member 11 and the stretchable additional member 24 is engaged and held in the second engaging recess 19, the thickness of the member engaged with the second engaging recess 19 can be increased. , the support of the face member 11 by the side frame rods 13 becomes stronger.
Since the stretchable additional member 24 is arranged in the bag-like portion 27 formed by bending the upper edge portion of the face material 11 toward the back side, it is difficult to be visually recognized from the direction of the seating surface of the face material 11 . A chair 1 with a good appearance can be obtained.

It should be noted that the present invention is not limited to the chair 1 according to the first embodiment described above, and appropriate modifications and replacements are possible within the scope of the present invention, and all of these are included in the present invention. be Other embodiments, modifications, and the like of the present invention will be described below. Parts and members that are the same as or similar to those of the first embodiment described above will be described using the same reference numerals.

Next, a chair 1 according to a second embodiment of the invention will be described with reference to FIGS. 13 to 17. FIG.
The second embodiment differs from the above-described first embodiment in the fixing structure for fixing the face member 11 to the side frame rods 13 of the back frame 10, and the rest of the structure is the same as the first embodiment. Therefore, in the chair 1 according to the second embodiment, the fixing structure of the face member 11 will be mainly described.
The edge member 30 used in the second embodiment is formed in a substantially L-shaped plate shape as shown in FIG. That is, the edge member 30 has a base portion 30a covered with the bag-like portion 27 of the face member 11 and a tongue portion 30b. 30ab, but may have the same thickness. A tongue portion 30b substantially orthogonal to the thick portion 30aa is formed by integrally forming a plate-like first receiving portion 30ba and a plate-like second receiving portion 30bb via a step 30bc. A pair of edge members 30 are formed in line symmetry.

As shown in FIGS. 14 and 15, the edge members 30 are attached by sewing or the like to the left and right ends of the surface of the upper edge of the face member 11, and the stretchable additional member is attached to the back surface side as in the first embodiment. 24 is attached by sewing or the like. The stretchable additional member 24 and the base portion 30a of the edge member 30 are wrapped in a bag-shaped portion 27 formed by bending the upper edge portion of the face member 11 twice toward the back side, and the tongue portion 30b of the edge member 30 is wrapped in the bag-shaped portion 27. It protrudes to the back side of the material 11 . Both sides of the bag-like portion 27 are separated by sewn portions 27a and 27b.
At one upper corner of the back frame 10 shown in FIGS. 16( a ) and 16 ( b ), the left and right side edges of the panel 11 and the edge reinforcing member 25 are formed on the outside of the side frame rods 13 . The left and right bag-like portions 27 of the upper edge are engaged with the engaging recesses 18 and are engaged with the projections 13 a of the side frame rods 13 and the second engaging recesses 31 . The second engaging recess 31 has an opening 31a formed at the boundary between the upper end protrusion 13a of the side frame rod 13 and the upper frame rod 14, and has a box-like space 31b with an inner region widened with respect to the outer side. have.

In the box-shaped space 31b of the second engaging recess 31, a stepped portion 31ca is formed on the bottom portion 31c. A screw hole 33 is formed in the wall surface of the innermost part of the box-shaped space 31b.
The edge member 30 protrudes from the bag-like portion 27 into the box-shaped space 31b in a state where the protrusion 13a of the side frame rod 13 is covered with the bag-like portion 27 of the face member 11 and mounted in the second engaging recess 31. The tongue portion 30b of the second engaging recess 31 has a stepped portion 31ca on the bottom portion 31c of the second engagement recessed portion 31 so that the stepped portion 30bc is positioned and installed. In this state, the pressing member 34 is fitted into the second engagement recess 31 from the inside to press the bag-shaped portion 27 against the inner wall of the second engagement recess 31 .
In FIG. 16, the edge member 30 is illustrated as being inserted into the second engaging recess 31 alone, but in reality, the stretchable additional member 24 and the base portion 23a are attached to the bag-like portion 27 of the face member 11. is enclosed, the tongue portion 30b is positioned on the bottom portion 31c.

The pressing member 34 has a shape shown in FIGS. 17(a) and 17(b). That is, the pressing member 34 has a substantially rectangular parallelepiped shape, and is formed with a tapered or stepped insertion hole 37 through which the bolt 35 is inserted from the front surface 34a toward the rear surface. A stopper piece 38 for positioning and fixing the edge member 30 by contacting the side surface of the tongue portion 30b of the edge member 30 protrudes from the lower portion of the front surface 34a.
A bolt 35 is inserted into the insertion hole 37 and formed on the inner wall of the space 31b while the pressing member 34 is tightly inserted and positioned in the box-shaped space 31b on the tongue portion 30b. It is fixed by screwing it into the screw hole 33 .

In this state, as shown in FIG. 18, the bag-shaped portion 27 of the face member 11 inserted into the box-shaped space 31b in the second engaging recess 31 is pressed by the side surface of the pressing member 34, whereby the bag is opened. It is possible to prevent the shape portion 27 from coming off upward and sideways. Moreover, by pressing the tongue portion 30b of the edge member 30 with the stopper piece 38 of the pressing member 34, the bag-shaped portion 27 including the edge member 30 can be prevented from coming off or slipping in and out of the second engaging recess 31. can be prevented to fix the face material 11. - 特許庁

As described above, according to the chair 1 according to the second embodiment, the tongue portion 30b of the edge member 30 projecting from the bag-shaped portion 27 of the face member 11 into the box-shaped space 31b of the second engaging recess 31 is Since the pressing member 34 presses and fixes from the top and side, it is possible to prevent the face material 11 from slipping or coming off in the vertical direction or the inward/outward direction.
Further, since the bolt 35 for fixing the pressing member 34 can be tightened in the direction along the face member 11 from the inner surface of the side frame rod 13, the face member 11 does not become an obstacle and is not conspicuous.

In each of the above-described embodiments, the upper edge of the face member 11 is folded twice to form the bag-like portions 27 at both left and right ends, but the present invention is not limited to such a configuration. For example, as a first modified example, the edge members 23 and 30 are attached to the surface of the upper edge of the face material 11 in the upside down direction, the base portions 23a and 30a are sewn, and the stretchable additional member 24 is sewn on the back surface. The bag-like portion 27 may be formed by bending the back side once and forming sewn portions 27a and 27b on both left and right sides.

In addition, as a second modification, the edge members 23 and 30 are sewn on the back surface and the stretchable additional member 24 is sewn on the front surface without folding the upper edge of the face material 11, and the edge members 23 and 30 on the back surface are sandwiched. For example, stretchable mesh-like cloth materials are overlapped and sewn, and the sewn portions 27a and 27b are sewn on both sides of the base portions 23a and 30a of the edge members 23 and 30 to form the bag-like portion 27. may
The bag-like portion 27 may adopt any of the above-described structures, and is formed in a bag-like shape by overlapping the right and left ends of the upper edge portion of the face member 11 so as to cover the projecting portion 13a of the side frame rod 13 from above. I wish I could.
In each of the above-described embodiments, the edge members 23 and 30 and the stretchable additional member 24 are individually attached to the front and back surfaces of the upper edge of the face member 11. good.

In addition, in each embodiment described above, the side frame rods 13 are included in the rod members.
Further, the edge member 23 in the first embodiment has the tongue portion 23b fixed to the receiving seat 21a of the side frame rod 13 with the bolt 28, so that it also serves as a pressing means for the face member 11. As shown in FIG. The edge member 30 and the pressing member 34 in the second embodiment are included in pressing means for the face member 11 .
The side edge (and edge reinforcement 25) that engages the first engaging recess 18 of the face member 11 is included in the first direction edge, and the upper edge that engages the second engaging recess 19 is included in the first direction edge. Contained in bi-directional edges.

In addition, in the chair 1 according to each of the above-described embodiments, the free end portion 11B (free end portion) sandwiched between the bag-shaped portions 27 at both ends of the bent portion 11b of the face member 11 is formed at the upper edge portion, and the left and right side edges are formed. Although the upper edge portion and the lower edge portion are engaged and fixed by the first engagement concave portion 18, the installation position of the free end portion 11B is not limited to the upper edge portion of the face member 11. FIG. It can be provided in an appropriate direction such as a side edge portion or a lower edge portion.
Further, in each of the above-described embodiments, the back frame 10 and the panel 11 of the backrest 5 have been described as load-bearing members for the chair 1, but the present invention is not limited to the backrest 5, as described above. It can also be applied to the frame of the seat 4 and its face material. Furthermore, the load supporting member of the present invention can also be applied to a headrest or the like that can be installed on the chair 1 .
In addition, the load bearing member of the present invention can also be applied to the surface material 11 and the rod material other than the chair 1, such as a net shelf of a vehicle, an insect net, and the like.

1 Chair 5 Backrest 10 Back frame 11 Face material 11B Free end 13 Side frame rod 13a Projection 18 First engagement recess 19, 31 Second engagement recess 19a, 31a Openings 23, 30 Edge members 23a, 30a Base 23b, 30b tongue portion 24 elastic additional member 25 edge reinforcing member 27 bag-like portions 27a, 27b sewn portions 28, 35 bolt 34 pressing member

Claims (5)

A pair of side frame rods arranged facing each other with a predetermined interval in the horizontal direction and extending in the vertical direction, an upper frame rod connecting upper ends of the pair of side frame rods, and the pair of side frame rods. A backrest comprising a panel installed between
The side frame rods are
a first engaging recess that extends along the up-down direction and opens outward in the left-right direction at the outer edge of the side frame rod ;
an opening formed at a connection portion of the upper end portion of the side frame rod with the upper frame rod and facing rearward from the front surface of the side frame rod;
extends downward from the innermost portion of the opening, communicates with the first engagement recess through the outer edge of the upper end of the side frame rod, and extends along the left-right direction intersecting the first engagement recess a second engaging recess;
a protrusion that forms the second engaging recess on the front surface of the upper end of the side frame rod and that forms the opening between itself and the upper frame rod;
with
The face material is
a first direction edge that engages with the first engaging recess;
a second direction edge that engages with the second engagement recess,
The backrest , wherein the second direction edge has a bag-like portion that engages with the protrusion . 2. The backrest according to claim 1, wherein said second engaging recess is provided with a pressing means for engaging said bag-like portion. 3. The backrest according to claim 2 , wherein said pressing means is a rim member sewn to said bag-shaped portion, and said rim member is fixed to said rod member. 3. The backrest according to claim 2 , wherein said pressing means comprises edge members sewn to said bag-like portion and pressing members for fixing said edge members to said rod members. A chair comprising the backrest according to any one of claims 1 to 4 .

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