JP2698711B2 - Chair cushion mounting structure - Google Patents

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, there has been known a chair provided with a seat having a structure in which a cushion is mounted on an upper surface of a shell.
In such a type, the cushion is attached to the shell as follows, for example. 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 the cushion a
A metal mounting wire c is buried therein so as to pass through each recess b. On the other hand, a bifurcated engagement 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 concave portion 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 exposing the exposed portion c1 located in each concave portion b of the mounting wire c. Each engaging portion e is elastically engaged.

[0003]

By the way, the conventional mounting wire c is formed by forming a metal wire material into a ring shape and joining the ends by welding, and is buried at a certain depth. Therefore, in a state in which the exposed portion c1 located in the concave portion of the attachment wire c is engaged with the engagement portion e, the tip e1 of the engagement portion e is closer to the cushion surface a1 than the attachment wire c.
It will protrude to the side. Therefore, only the portion where the engaging portion e is present has a reduced cover thickness of the cushion a, giving a rugged feeling to the occupant. In other words, if the thickness of the cushion is set so as not to cause discomfort due to the presence of the engaging portion e, the problem that the cushion a becomes unnecessarily too thick in a portion other than the portion where the engaging portion e is present. is there.

[0004] An object of the present invention is to solve such a problem.

[0005]

The present invention is characterized by taking the following means to achieve such an object.

That is, in the cushion mounting structure for a chair according to the present invention, a concave portion is formed at a plurality of positions on the back surface of the cushion, and a mounting wire is buried inside the cushion so as to pass through each of the concave portions. An exposed portion located in each recess of the mounting wire is engaged with an engaging portion protruding from the inner surface of the shell, and the cushion is mounted on the shell. It is characterized in that it is deflected to the cushion back side from the exposed part.

In order to effectively prevent the cushion from being lifted from the shell, the engaging portion located at one end of the shell has a hook shape bent toward the other end of the shell, and the other engaging portion is forked. In the shape of, the mounting wire,
It is preferable that the hook is engaged with the bent portion of the hook-shaped engaging portion and the forked engaging portion is engaged by utilizing the elasticity of the member.

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

In order to simplify the manufacturing, it is preferable to integrally form the engaging portion and the shell with a synthetic resin.

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 engagement portion has an upright wall protruding from the shell, and a mounting wire is held at the tip of the upright wall. The notch groove is formed so that the bottom has a width substantially corresponding to the diameter of the mounting wire, the open end has an opening width larger than the diameter of the mounting wire, and the middle portion has Has a width slightly smaller than the diameter of the mounting wire.

In order to hold the mounting wire in a more stable state, the forked engaging portions inserted into the respective recesses are provided with a pair of upright walls opposed to each other at required intervals. Good.

[0012]

According to this structure, each exposed portion of the mounting wire is provided.
Is shifted more toward the back of the cushion than the unexposed part.
Therefore, the shape of the engaging part was changed only by setting this deviation distance.
Or sacrifice the reliable engagement between the mounting wire and the engagement part.
Eliminates the rugged feeling due to the presence of the engaging portion
Can be That is, according to such a configuration, the mounting
Cushion from the tip of the engaging part that engages each exposed part of the wire
Increase the distance to the surface, for example, from the unexposed
About the same as or larger than the distance to the surface
It is also easy to make settings. Therefore, it is possible to eliminate the disadvantage that the cushion thickness is partially insufficient only in the portion where the engagement portion exists. Therefore, without increasing the thickness of the cushion unnecessarily, capacity is possible to solve the rugged feeling due to the presence of the engaging portion
It becomes possible easily . Note that “substantially the same” here means the same
One value and a value within the range of plus / minus error of that value
Means that this error is within the common sense for those skilled in the art.
Of course, this means a manufacturing error. "More
"Large" specifically means the same value plus the maximum error.
It means larger than the difference value.

Further, according to the present invention, only the exposed portion of the mounting wire can be made to approach the shell without making the burying depth of the mounting wire unduly too shallow. for that reason,
The protrusion size of the engaging portion can be reduced while maintaining the mounting strength of the cushion. Therefore, it is easy to integrally mold the engaging portion with the shell.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an exploded view of a seat portion of a chair. This seat is provided with a cushion 1 and a shell 2. Then, concave portions 11, 12, and 13 are formed at a plurality of positions on the back surface 1a of the cushion 1, and the cushion 1
A mounting wire 14 is buried inside the recesses 11, 12 and 13 so as to pass through the recesses 11, 12 and 13.
Exposed portion 14a located in each of the concave portions 11, 12, 13 of
The cushion 1 is engaged with the engaging portions 3, 4, 5 provided on the inner surface 2a of the shell 2 so that the cushion 1 is
It is designed to be attached to.

More specifically, as shown in FIGS. 1, 2, and 4 to 7, the cushion 1 is provided with an upholstery 16 on the front and back peripheral edges of a cushion core material 15 such as urethane. The cushion core material 15 is exposed on the back surface 1a. A front end recess 11, a side end recess 12, and a rear end recess 13 are formed on the lower surface of the cushion core material 15, respectively. Inside the cushion core 15, for example, a metal mounting wire 14 having a circular cross section is embedded. The attachment wire 14 is formed by forming a metal wire material into an annular shape and joining the ends thereof by welding. As shown in FIG. 3, the portions located on both sides of the recesses 11, 12, and 13 are bent downward. , The exposed portions 14a, 14b, 14c
Are deviated more toward the cushion back surface 1a side than the non-exposed portion 14d. The mounting wire 14 is embedded in the cushion 1 such that the exposed portions 14a, 14b, and 14c pass through the recesses 11, 12, and 13, respectively.

The shell 2 is made of, for example, a synthetic resin supported on a seat (not shown). As shown in FIG. 1, a large number of reinforcing ribs 21 are integrally protruded from an inner surface 2a of the shell. As shown in FIGS. 1, 4 and 5, hook-shaped engaging portions 3 are integrally protruded from portions of the shell 2 corresponding to the front end recesses 11 on the front end 2 b side. The hook-shaped engaging portion 3 has a shape in which the distal end portion 31 is bent toward the rear end 2c of the shell 2 so that the mounting wire 14 can be hooked on the bent portion 32. In this embodiment, three hook-shaped engaging portions 3 projecting in parallel are inserted into each front end concave portion 11, but the number thereof can be changed as appropriate. As shown in FIG. 1 and FIG. 8, a forked engaging portion 4 is integrally provided at a portion corresponding to each side end recess 12 in the left and right end 2 d of the shell 2. Each bifurcated engagement portion 4 has a single upright wall 41 protruding from the shell 2, and a cutout groove 42 for holding the mounting wire 14 is formed at the end of the upright wall 41.
The notch groove 42 has a bottom 42 a having a width substantially corresponding to the diameter of the mounting wire 14, and an open end 42 c having a width corresponding to the mounting wire 14.
The intermediate portion 42b has a larger opening width than the mounting wire 1
4 has a width dimension slightly smaller than the diameter of the diameter. Notch groove 4
Reinforcing ribs 43 are integrally formed on both sides of 2. As shown in FIG. 1, FIG. 6, FIG. 7, and FIG. 9, a forked engaging portion 5 is provided on a portion corresponding to the rear end recess 13 on the rear end 2c side of the shell 2. This bifurcated engagement portion 5
Has two parallel upstanding walls 51 protruding from the shell 2, and a cutout groove 52 for holding the mounting wire 14 is formed at the tip of each of the upstanding walls 51. Notch groove 5
2, the bottom 52a has a width substantially corresponding to the diameter of the mounting wire 14, the opening end 52c has an opening width larger than the diameter of the mounting wire 14, and the intermediate portion 52b is slightly smaller than the diameter of the mounting wire 14. It has a width dimension. Each standing wall 51
The reinforcing ribs 53 are integrally formed on both sides of the notch groove 52 in FIG.

FIGS. 4 to 7 show a state in which the cushion 1 is mounted on the shell 2. The installation of the cushion 1
First, the exposed portion 14a located in the front end concave portion 11 of the attachment wire 14 is hooked on the bent portion 32 of the hook-shaped engaging portion 3, and thereafter, the center both sides and the rear end of the cushion 1 are pressed downward. The exposed portion 14b located in the side end recess 12 of the mounting wire 14 and the exposed portion 14 located in the rear end recess 13
c is elastically engaged with the corresponding forked engagement portions 4 and 5.
That is, when the mounting wire 14 is pressed against the forked engaging portions 4 and 5, the mounting wire 14 utilizes the temporary elastic deformation of the upright walls 41 and 51, and the intermediate portion 42 of the notch grooves 42 and 52.
b, 52b and the bottom 42 of the notch grooves 42, 52
a, 52a. Thus, in such a mounting state, each exposed portion 14 of the mounting wire 14 is
The distance L from the tips 3a, 4a, 5a of the engaging portions 3, 4, 5 to be engaged with the cushion surfaces 1a, 14b, 14c.
Is set to be substantially the same as the distance M from the non-exposed portion 14d of the mounting wire 14 to the cushion surface 1e.

According to such a configuration, the engaging portions 3, 4,.
Only in the portion where 5 exists, it is possible to eliminate the disadvantage that the thickness of the cushion 1 is partially insufficient. Therefore, the rugged feeling due to the presence of the engaging portions 3, 4, 5 can be eliminated without unnecessarily increasing the thickness of the cushion 1, and a comfortable sitting feeling can be provided. Further, according to the present invention, the mounting wire 14 can be mounted without unduly making the burying depth of the mounting wire 14 too shallow.
Only the exposed portions 14 a, 14 b, and 14 c can be made to approach the shell 2. Therefore, the protrusion 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 can be molded using a mold having a relatively small uneven size, which facilitates the manufacture of the mold and improves the durability of the mold.

The engaging portions are not limited to those of the above-described embodiment. For example, all of the engaging portions may have a forked shape. However, with the configuration as in the above embodiment, the following effects can be obtained. That is, in the case of the above-described embodiment, even when the occupant leans backward and a forward pressing force acts on the cushion 1, the mounting wire 14 of the cushion 1 is bent by the hook-shaped engagement portion 3. The portion 32 is more strongly engaged, so that the front edge portion 1b of the cushion 1 does not rise from the shell 2. The other engaging portions 4 and 5 provided on the front end 2b of the shell 2 other than the hook-shaped engaging portions 3 are bifurcated portions opened upward, but the side edge portion 1d and the rear edge portion of the cushion 1 are provided. At 1c, the mounting load increases with the backward inclination, so that the mounting wire 14 does not come off from the forked engaging portions 4, 5. Therefore, the cushion 1 can be more reliably attached to the shell 2 than in a case where all the engaging portions are bifurcated, and the problem that the front edge 1b of the cushion 1 rises can be solved. it can.

Further, even when the engaging portion is formed in a bifurcated shape, the form is not limited to the illustrated one.
Various modifications can be made without departing from the spirit of the present invention. For example, the bifurcated engagement portions may be provided with upright walls forming a pair. However, in the case where the mounting wire is held by the bifurcated engagement portion composed of one standing wall, the mounting wire becomes easy to perform a seesaw operation with the standing wall as a fulcrum. When a large unbalanced load is applied, the mounting wire is deformed relatively without resistance, and in an extreme case, a specific portion may be lifted up and slightly detached from the adjacent engaging portion. On the other hand, if all of the bifurcated engagement portions inserted into the respective recesses have a pair of upright walls, it is possible to effectively prevent a partial seesaw operation of the mounting wire. it can. 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 engaging with each exposed portion of the mounting wire to the cushion surface may be set to be slightly larger than the distance from the non-exposed portion of the mounting wire to the cushion surface.

Further, the present invention is not limited to a seat, but can be similarly applied to a backrest having a cushion attached to the front surface of a shell.

[0023]

According to the present invention, as described above, each of the mounting wires
By exposing the exposed part to the cushion back side more than the unexposed part
Therefore, the shape of the engaging part can be
Change or sacrifice the secure engagement between the mounting wire and the engaging part.
Engage with each exposed part of the mounting wire without damaging
The distance from the tip of the engagement part to the cushion surface is, for example,
The distance from the unexposed part of the mounting wire to the cushion surface
It can easily be set to be the same or larger. I
Accordingly, it is possible to eliminate the disadvantage that the cushion is partially insufficient in the portion where the engagement portion exists. Therefore, without increasing the thickness of the cushion unnecessarily, volumes of rugged feeling due to the presence of the engaging portion
It can be easily resolved. That is, according to the present invention, it is possible to provide a comfortable sitting position by selecting an optimum cushion thickness without being required to unnecessarily increase the thickness of the cushion due to the presence of the engaging portion. Can be easily performed . Further, according to the present invention, only the exposed portion of the mounting wire can be made to approach the shell without making the embedding depth of the mounting wire unduly too shallow. Therefore, it is possible to reduce the protrusion dimension of the engagement portion while maintaining the mounting strength of the cushion. Therefore, there is also an effect that it is easy to integrally mold the engaging portion with the shell.

[Brief description of the drawings]

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

FIG. 2 is a rear view showing the cushion of the embodiment.

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

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

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

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

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

 DESCRIPTION OF SYMBOLS 1 ... Cushion 1a ... Back surface 1e ... Front surface 2 ... Shell 3 ... Engagement part (hook-shaped engagement part) 3a ... Tip 4 ... Engagement part (bifurcated engagement part 94a ... Tip 5 ... Engagement part (bifurcated) Engagement part) 5a ... front end 11 ... front end recess 12 ... side end recess 13 ... rear end recess 14 ... mounting wire 14a, 14b, 14c ... exposed part 14d ... non-exposed part 31 ... tip part 32 ... bent part 41 ... standing wall 42 ... notch groove 42a ... bottom part 42b ... middle trunk part 42c ... opening end part 51 ... standing wall 52 ... notch groove 52a ... bottom part 52b ... middle part 52c ... opening end part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masamitsu Miyashita 5331 Nishiharu Kinoshita Kawara, Ina-shi, Nagano Furniture Division, Takano Corporation (JP, U) Japanese Utility Model Showa 57-133351 (JP, U) Japanese Utility Model Showa 54-4704 (JP, U)

Claims (6)

(57) [Claims] A cushion is formed at a plurality of locations on the back surface of a cushion, and mounting wires are buried inside the cushion so as to pass through the recesses, and exposed in the recesses of the mounting wire. The shell is attached to the shell by engaging the part with the engaging part protruding from the inner surface of the shell, and each exposed part of the mounting wire is deflected to the back side of the cushion from the non-exposed part. A cushion mounting structure for a chair. 2. An exposing portion of the mounting wire, wherein an engaging portion located at one end of the shell has a hook shape bent toward the other end of the shell, and the other engaging portion has a bifurcated shape. The cushion mounting structure for a chair according to claim 1, wherein the hook is hooked on a bent portion of the hook-shaped engaging portion and is engaged with the forked-shaped engaging portion by utilizing elasticity of the member. 3. The apparatus according to claim 1, wherein all the engaging portions are bifurcated, and the exposed portion of the mounting wire is engaged with the bifurcated engaging portion by utilizing the elasticity of the member. 2. The cushion mounting structure of the chair according to 1. 4. A cushion mounting structure for a chair according to claim 2, wherein said engaging portion and said shell are integrally formed of synthetic resin. 5. A fork-shaped engaging portion having an upright wall protruding from a shell, and a notch groove for holding a mounting wire formed at a tip of the upright wall. The bottom portion has a width substantially corresponding to the diameter of the mounting wire, the open end forms an opening width larger than the diameter of the mounting wire, and the middle portion has a width slightly smaller than the diameter of the mounting wire. The cushion mounting structure for a chair according to claim 4, wherein the cushion mounting structure is provided. 6. A cushion mounting for a chair according to claim 2, wherein the bifurcated engagement portions inserted into each of the recesses have a pair of upright walls facing each other at a required interval. Construction.