JPH04246309A - Chair cushion mounting structure - Google Patents

Abstract

PURPOSE:To prevent the rugged feeling from being given to the surface side of a cushion due to existence of an engaging part. CONSTITUTION:Exposed parts 14a, 14b and 14c of a fitting wire 14 embedded in a cushion 1 are engaged to engaging parts 3, 4 and 5 provided projectingly on the inside surface of a shell 2. Each exposed part 14a, 14b and 14c of the fitting wire rod 14 is deflected to the side of a cushion reverse side 1a from a non-exposed part, and a distance extending from the tip of the engaging parts 3, 4 and 5 to the cushion surface is set to almost the same as a distance extending from a non-exposed part of the fitting wire 14 to the cushion surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion mounting structure for a chair used in an office or the like.

0002

2. Description of the Related Art Conventionally, chairs have been known which include a seat having a cushion attached to the upper surface of a shell. In this type of cushion, for example, the cushion is attached to the shell in the following manner. That is, as shown in FIGS. 10 and 11, a plurality of recesses b are formed on the back surface of the cushion a, and a metal attachment wire c is embedded in the cushion a so as to pass through each of the recesses b. be. On the other hand, a bifurcated engaging portion e that can be inserted into each of the recesses b is attached to the upper surface of the shell d. Then, while inserting the engaging portion e into the recess b, the back surface of the cushion a and the upper surface of the shell d are overlapped and strongly pressed against each other, thereby removing the exposed portion c1 located in each recess b of the attachment wire c. Each engaging portion e is elastically engaged.

0003

By the way, the conventional mounting wire c is simply a metal wire material formed into an annular shape and its ends joined together by welding, and is buried at a constant depth. Therefore, when the exposed portion c1 located in the recess of the attachment wire c is engaged with the engagement portion e, the tip e1 of the engagement portion e is lower than the attachment wire c on the cushion surface a1.
It will protrude to the side. Therefore, there is a problem in that the covering thickness of the cushion a is reduced only in the portion where the engaging portion e is present, giving a rugged feeling to the seated person. In other words, if the thickness of the cushion is set to a level that does not cause discomfort due to the presence of the engaging portion e, the problem that the cushion a becomes unnecessarily thick in areas other than the portion where the engaging portion e is present is avoided. be.

The present invention aims to solve these problems.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized by taking the following measures.

That is, in the chair cushion mounting structure according to the present invention, recesses are formed at a plurality of locations on the back surface of the cushion, and mounting wires are embedded inside the cushion so as to pass through each of the recesses. The cushion is attached to the shell by engaging the exposed portions of the attachment wire in each recess with an engaging portion protruding from the inner surface of the shell, in which each exposed portion of the attachment wire is attached to the shell. The distance from the tip of the engaging part to the cushion surface, which is deviated from the exposed part to the back side of the cushion and engages with each exposed part of the attachment wire, is the distance from the non-exposed part of the attachment wire to the cushion surface. It is characterized by being set to be substantially the same or larger.

In order to effectively prevent the cushion from lifting up relative to the shell, the engaging portion located at one end of the shell should be bent toward the other end of the shell, and the other engaging portion should be bifurcated. It is preferable that the attachment wire is hooked on a bent portion of the hook-shaped engagement portion and engaged with the bifurcated engagement portion using the elasticity of the member.

The present invention also includes a device in which all the engaging portions are bifurcated, and the attachment wire is engaged with the bifurcated engaging portions by utilizing the elasticity of the member. .

[0009] In order to simplify manufacturing, it is preferable that the engaging portion and the shell be integrally molded from synthetic resin.

[0010] In order to effectively suppress the appearance of dents and the like due to sink marks on the outer surface of the shell, the bifurcated engaging portion has an upright wall protruding from the shell, and the mounting wire is clamped at the tip of the upright wall. The cutout groove has a bottom portion having a width approximately corresponding to the diameter of the attachment wire, an opening end having an opening width larger than the diameter of the attachment wire, and a middle portion of the notch groove. It is preferable that the wire has a width slightly smaller than the diameter of the attachment wire.

[0011] In order to hold the attachment wire in a more stable state, it is recommended that the bifurcated engaging portion inserted into each recess be provided with a pair of upstanding walls facing each other at a required interval. good.

0012

[Operation] According to such a structure, it is possible to eliminate the problem that the thickness of the cushion is partially insufficient only in the portion where the engaging portion is present. Therefore, it is possible to eliminate the rugged feeling caused by the presence of the engaging portion without unnecessarily increasing the thickness of the cushion.

Further, according to the present invention, only the exposed portion of the attachment wire can be brought close to the shell without unduly reducing the burial depth of the attachment wire. Therefore,
The protruding dimension of the engaging portion can be reduced while maintaining the mounting strength of the cushion. Therefore, it becomes easier to integrally mold the engaging portion with the shell.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

FIG. 1 shows an exploded view of the seat of the chair, which is comprised of a cushion 1 and a shell 2. Then, recesses 11, 12, and 13 are formed at multiple locations on the back surface 1a of the cushion 1, and the cushion 1
A mounting wire 14 is embedded in the recess 11, 12, and 13 so as to pass through each of the recesses 11, 12, and 13, and the mounting wire 14
exposed portions 14a located within each of the recesses 11, 12, 13;
14b and 14c are provided on the inner surface 2a of the shell 2.
, 4 and 5 to attach the cushion 1 to the shell 2.

To be more specific, the cushion 1 is shown in FIGS. 1 and 2.
, as shown in FIGS. 4 to 7, is a cushion core material 15 made of urethane or the like, with an overlay 16 attached to the front and back peripheral edges, and the cushion core material 15 is exposed on the back surface 1a. There is. A front end recess 1 is provided on the lower surface of the cushion core material 15.
1, a side end recess 12, and a rear end recess 13 are formed, respectively. Inside the cushion core material 15, for example,
A metal attachment wire 14 having a circular cross section is embedded. The attachment wire 14 is made by forming a metal wire material into an annular shape and joining the ends by welding, and as shown in FIG. 3, the parts located on both sides of the recesses 11, 12, 13 are bent downward. , the exposed portions 14a, 14b, and 14c are offset toward the cushion back surface 1a side relative to the non-exposed portion 14d. This attachment wire 14 is connected to the exposed portion 14a.
, 14b, 14c are embedded in the cushion 1 so as to pass through the respective recesses 11, 12, 13.

The shell 2 is, for example, made of synthetic resin and supported on a seat support (not shown), and has a large number of reinforcing ribs 21 integrally protruding from its inner surface 2a, as shown in FIG. As shown in FIGS. 1, 4, and 5, a portion corresponding to the front end recess 11 on the front end 2b side of the shell 2 has
Hook-shaped engaging portions 3 are integrally provided. The hook-shaped engagement portion 3 has a tip portion 31 bent toward the rear end 2c of the shell 2, and the attachment wire 14 is attached to the bent portion 32.
It is designed so that it can be hung. In this embodiment, three hook-shaped engaging portions 3 protruding in parallel are inserted into each front end recess 11, but the number can be changed as appropriate. The portions corresponding to the side end recesses 12 in the left and right end portions 2d of the shell 2 are shown in FIGS. 1 and 8.
As shown in FIG. 2, the bifurcated engaging portions 4 are provided in a protruding manner. Each bifurcated engaging portion 4 has one standing wall 41 that projects from the shell 2, and a cutout groove 42 for holding the attachment wire 14 is formed at the tip of the standing wall 41. The notch groove 42 has a bottom portion 42a having a width that approximately corresponds to the diameter of the attachment wire 14, and an open end 42c that corresponds to the diameter of the attachment wire 14.
The middle part 42b has a larger opening width than the mounting wire 1.
The width dimension is slightly smaller than the diameter of No. 4. Notch groove 4
Reinforcing ribs 43 are integrally formed on both sides of 2. As shown in FIGS. 1, 6, 7 and 9, a bifurcated engaging portion 5 is provided at a portion of the rear end 2c of the shell 2 corresponding to the rear end recess 13. This bifurcated engagement portion 5 has two parallel upright walls 51 that protrude from the shell 2,
A cutout groove 52 for holding the attachment wire 14 is formed at the tip of each of the upright walls 51. The notch groove 52 has a bottom portion 52a having a width approximately corresponding to the diameter of the attachment wire 14, an opening end 52c having an opening width larger than the diameter of the attachment wire 14, and an intermediate portion 52b having a width larger than the diameter of the attachment wire 14. It has a slightly smaller width dimension. Reinforcing ribs 53 are integrally formed on both sides of the notched groove 52 in each standing wall 51.

FIGS. 4 to 7 show the cushion 1 attached to the shell 2. To install cushion 1,
First, the exposed part 14a located in the front end recess 11 of the attachment wire 14 is hooked to the bent part 32 of the hook-shaped engaging part 3, and then the center both sides and the rear end of the cushion 1 are pressed downward. The exposed portion 14b located within the side end recess 12 of the attachment wire 14 and the exposed portion 14 located within the rear end recess 13.
c is elastically engaged with the corresponding bifurcated engaging portions 4 and 5. That is, when the attachment wire 14 is pressed against the bifurcated engaging portions 4 and 5, the attachment wire 14 utilizes temporary elastic deformation of the upright walls 41 and 51 to close the intermediate portions 42b of the notch grooves 42 and 52.
, 52b, and the bottoms 42a of the notched grooves 42, 52.
, 52a. Therefore, in such a mounting state, each exposed portion 14a of the mounting wire 14
, 14b, 14c, the tips 3 of the engaging parts 3, 4, 5
The distance L from a, 4a, 5a to the cushion surface 1e is from the non-exposed portion 14d of the attachment wire 14 to the cushion surface 1.
It is set to be approximately the same as the distance M to e.

According to such a configuration, the engaging portions 3, 4,
It is possible to eliminate the problem that the thickness of the cushion 1 is partially insufficient only in the portion where the cushion 1 is present. Therefore, it is possible to eliminate the rugged feeling caused by the presence of the engaging portions 3, 4, and 5 without unnecessarily increasing the thickness of the cushion 1, and it is possible to provide a comfortable sitting feeling. In addition, this method allows the attachment wire 14 to be buried without making the burial depth of the attachment wire 14 unduly shallow.
Only the exposed portions 14a, 14b, 14c of 4 can be brought close to the shell 2. Therefore, the protruding dimensions of the engaging portions 3, 4, and 5 can be reduced while maintaining the mounting strength of the cushion 1. Therefore, when the engaging portion is integrally molded with the shell, it is possible to perform the molding using a mold with relatively small irregularities, which facilitates the manufacturing of the mold and improves the durability of the mold.

[0020] The engaging portions are not limited to those of the embodiments described above; for example, all the engaging portions may be bifurcated. However, if the configuration is as in the embodiment described above, the following effects can be obtained. In other words, in the case of the embodiment described above, even if a forward pressing force is applied to the cushion 1 due to the seated person leaning back, the attachment wire 14 of the cushion 1 will not bend the hook-shaped engagement portion 3. This results in a stronger engagement with the portion 32 and prevents the front edge portion 1b of the cushion 1 from lifting off from the shell 2. The other engaging parts 4 and 5 other than the hook-shaped engaging part 3 provided on the front end 2b of the shell 2 are bifurcated parts that are released upward. Since the load applied to 1c increases with the backward tilt, the attachment wire 14 does not come off from the bifurcated engaging portions 4 and 5. Therefore, compared to the case where all the engaging parts are bifurcated, the cushion 1 can be more securely attached to the shell 2, and the problem of the front edge 1b of the cushion 1 lifting up can be solved. can.

Furthermore, even when the engaging portion is bifurcated, its form is not limited to that shown in the drawings.
Various modifications can be made without departing from the spirit of the invention. For example, all of the bifurcated engaging portions may be provided with a pair of standing walls. However, when the attachment wire is held by a bifurcated engagement portion consisting of a single upright wall,
It becomes easier to see-saw using the standing wall as a fulcrum,
If the shell is twisted or a large unbalanced load is applied to a certain part of the cushion, the attachment wire will deform with relatively little resistance, and in extreme cases, a particular part will lift up and separate from the adjacent engaging part. There is a risk that it will come off. On the other hand, if all of the bifurcated engaging parts inserted into each recessed part each have a pair of standing walls,
Partial seesaw movement of the attachment wire can be effectively prevented. Therefore, it is possible to make the attachment state of the attachment wire to the shell more stable and strong. Furthermore, the distance from the tip of the engaging portion that engages with each exposed portion of the attachment wire to the cushion surface may be set to be slightly larger than the distance from the non-exposed portion of the attachment wire to the cushion surface.

Furthermore, the present invention is not limited to a seat, but can be similarly applied to a backrest formed by attaching a cushion to the front surface of a shell.

[0023]

[Effects of the Invention] Since the present invention is constructed as described above, it is possible to eliminate the problem that the thickness of the cushion is partially insufficient only in the portion where the engaging portion is present. Therefore, the rugged feeling caused by the presence of the engaging portion can be eliminated without unnecessarily increasing the thickness of the cushion. That is, according to the present invention, the optimal cushion thickness is selected to provide a comfortable sitting experience without requiring the cushion to be unnecessarily thick due to the presence of the engaging portion. It becomes possible to do so. Further, according to the present invention, only the exposed portion of the attachment wire can be brought close to the shell without making the burial depth of the attachment wire too shallow. Therefore, the protruding dimension of the engaging portion can be reduced while maintaining the mounting strength of the cushion. Therefore, there is also an effect that it becomes easier to integrally mold the engaging portion with the shell.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention.

FIG. 2 is a back view showing the cushion of the same embodiment.

FIG. 3 is a perspective view showing the attachment wire of the same embodiment.

FIG. 4 is a side sectional view showing the front end portion of the cushion of the same embodiment.

FIG. 5 is a sectional view taken along line A-A in FIG. 4;

FIG. 6 is a side sectional view showing the rear end portion of the cushion of the same embodiment.

FIG. 7 is a sectional view taken along line BB in FIG. 6;

FIG. 8 is a perspective view showing an engaging portion in the same embodiment.

FIG. 9 is a perspective view showing an engaging portion in the same embodiment.

FIG. 10 is a side sectional view showing a conventional example.

FIG. 11 is a side sectional view showing the conventional example.

[Explanation of symbols]

1...Cushion 1a...Back side 1e…Surface 2...Shell 3...Engaging part (hook-shaped engaging part) 3a...Tip 4...Engaging part (bifurcated engaging part 9 4a...Tip 5...Engaging part (bifurcated engaging part) 5a...Tip 11...Front end recess 12...Side end recess 13... Rear end recess 14...Mounting wire rod 14a, 14b, 14c...Exposed portion 14d...Non-exposed part 31...Tip part 32...Bending part 41...Standing wall 42...Notch groove 42a...bottom 42b…middle management 42c...opening end 51... Standing wall 52...Notch groove 52a...bottom 52b...middle part 52c...opening end

Claims (6)

[Claims] Claim 1: A plurality of recesses are formed on the back surface of the cushion, and a mounting wire is buried inside the cushion so as to pass through each of the recesses, and an exposed portion of the mounting wire is located in each recess. In the case where the cushion is attached to the shell by engaging an engaging portion protruding from the inner surface of the shell, each exposed portion of the attachment wire is deviated toward the back side of the cushion than the non-exposed portion. The distance from the tip of the engaging part that engages with each exposed part of the attachment wire to the cushion surface is set to be approximately the same as or larger than the distance from the non-exposed part of the attachment wire to the cushion surface. Characteristic chair cushion mounting structure. 2. An engaging portion located at one end of the shell is hook-shaped to bend toward the other end of the shell, and the other engaging portion is bifurcated, and the exposed portion of the attachment wire is provided. 2. The chair cushion mounting structure according to claim 1, wherein the member is hooked onto a bent portion of the hook-like engaging portion and engaged with the bifurcated engaging portion by utilizing the elasticity of the member. 3. All the engaging parts are bifurcated, and the exposed part of the attachment wire is engaged with the bifurcated engaging parts by utilizing the elasticity of the member. Cushion mounting structure of the chair described in 1. 4. The chair cushion mounting structure according to claim 2 or 3, wherein the engaging portion and the shell are integrally molded from synthetic resin. 5. The bifurcated engagement portion has an upright wall protruding from the shell, and has a cutout groove formed at the tip of the upright wall for holding the attachment wire, and the notch groove The bottom part has a width approximately corresponding to the diameter of the attachment wire, the opening end has an opening width larger than the diameter of the attachment wire, and the middle part has a width slightly smaller than the diameter of the attachment wire. 5. The chair cushion mounting structure according to claim 4. 6. The chair cushion attachment according to claim 2 or 3, wherein the bifurcated engaging portion inserted into each recess is provided with a pair of upright walls facing each other at a predetermined interval. structure.