JP2885016B2 - Chair shell - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a shell of a chair of this type, for example, flat ribs perpendicular to a plane are provided radially from a center portion, and those ribs are further connected to each other by another rib to reduce the weight and weight. There is known one having a shape rich in rigidity. In other words, even if it is a shell that holds the cushion of the seat, or a shell that holds the cushion of the backrest,
It is configured not to be easily deformed by the load applied during use.

[0003]

By the way, in the case of a chair used in an office or the like, the user twists his / her body in a seated state and takes a document or the like behind, or turns backward to receive an article. Happening back and forth. In such a case, for example, in a chair using a shell having a high rigidity as described above for a backrest, for example, when the body is twisted backward in a sitting state, the backrest is difficult to deform, so the body tilts. It does not protrude backward beyond the angle at which it does. Further, when the shell of the seat has the above-described configuration, for example, when the seat is bent forward in the sitting posture, the vicinity of the thigh may be pressed by the front edge of the seat.

[0004] In order to solve such a problem, efforts have been made to reduce the number of ribs at required locations or to omit ribs in a certain direction to partially impart flexibility to the shell. The conventional plate-shaped rib has a function of imparting rigidity to its formation region, but does not have a function of positively imparting flexibility. In addition, since the shell is integrally formed of a synthetic resin or the like, it is difficult to impart flexibility by partially reducing its thickness in consideration of its molding quality and durability. For this reason, there is a certain limit in imparting appropriate flexibility to the consumable portion of the shell, and some measures are desired. An object of the present invention is to solve such a problem.

[0005]

In order to achieve the above object, the present invention takes the following measures. That is, the chair shell according to the present invention is a chair shell that supports a chair cushion, has rigidity against bending in one direction, and has a rigidity in a direction perpendicular to one direction. Ri na have a rib structure having flexibility against bending rib structure, shell except the outer edge of the shell
And the unit rib is substantially perpendicular to the one direction.
A plurality of wavy ribs arranged side by side in the direction
Is characterized in that a hollow ridge and a concave groove are continuously formed .

[0006] As a typical embodiment, the above-mentioned ridge is provided.
One having a rectangular cross-sectional outer shape may be used. further,
The unit rib can be a straight one or a curved one according to the shape of the place where it is formed.

[0007]

With such a structure, the rib structure has rigidity in one direction whether it is for a seat or a backrest, so that it needs a body holding function when used. If one direction is provided so as to coincide with the direction, although it is flexible in a direction perpendicular to the one direction (hereinafter referred to as a perpendicular direction), it is necessary and sufficient as a seat and a backrest. Demonstrate strength. In addition, since it is flexible in the right angle direction, it tilts when a load is applied in that direction, and extreme changes in posture while sitting on a chair, such as twisting or stretching the body backward, easily nacelle also of
To become. Such a rib structure is a wavy rib formed by continuously connecting unit ribs having the same cross-sectional shape in the perpendicular direction .
In, easy to form, yet it is possible to ensure the normal ribs similar stiffness in one direction. However, in such a wavy rib, even if the same material is used under the same conditions, the characteristics become remarkable depending on the direction, so that it is optimal for imparting various strength characteristics to desired portions of the shell. Become. And the rib structure, except for the outer edge of the shell
Because it is located in the plane, the outer edge of the shell and the rib structure
The strength characteristics of the shell can be set widely by changing the distance from the end
In addition to being able to cut, the rib of the unit rib is hollow
In addition, it can partially add rigidity and flexibility to the shell.
You.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The shell SH shown in FIG. 1 is for a chair with a backrest integrated with a backrest, and a cushion is attached to an upper surface thereof. The shell SH is made of, for example, an elastically deformable synthetic resin such as polypropylene, and a substantially planar seat corresponding portion 1 and a backrest corresponding portion 2 are integrally formed, and a portion near the front edge 11 of the seat corresponding portion 1 is formed. In the vicinity of both sides 31 of the connecting portion 3 between the seat corresponding portion 1 and the backrest corresponding portion 2, and near the upper edge 21 of the backrest corresponding portion 2, corrugated ribs 41 as the rib structures 4 are provided. In addition, a rib structure other than the wavy ribs 41 not described below and a cushion mounting structure, and further, a shell S including a back support rod
As the structure for attaching the H to the support unit and the like, a structure widely known in the art can be used, and thus illustration and description are omitted. In the chair with a backrest using the shell SH, the back support rods support the backrest-corresponding portion 2 of the shell SH on both sides, and the front edge of the seat is downward and the upper edge of the backrest is rearward. Can be tilted. Further, the connecting portion 3 between the backrest and the seat is configured to move rearward and expand right and left when a load is applied.

The wavy rib 41 is formed so that the longitudinal direction of the seat corresponding portion 1 and the backrest corresponding portion 2 coincides with the left-right direction, and the connecting portion 3 has the vertical direction and its longitudinal direction. It is formed in agreement. The wavy rib 41 of this embodiment has, for example, six unit ribs 41a formed by connecting one upper edge of a concave groove 41c to one lower edge of a ridge 41b having a rectangular cross-sectional shape. It is molded continuously in the direction perpendicular to the direction. This wavy rib 41
The bottom surface of the concave groove 41c of the unit rib 41a is formed so as to be substantially flush with the upper surface of the shell SH so that the upper surface of the shell SH is uneven.

With such a structure, when the wavy rib 41 is viewed using the upper surface of the shell SH as a reference plane, the wavy rib 41
Can be regarded as a structure in which ridges having a U-shaped cross section are continuously provided at predetermined intervals. Therefore, the wavy rib 41 is
In the longitudinal direction, it exhibits the same or higher rigidity as conventional ribs, and in the direction perpendicular to the longitudinal direction,
Since the flat plate having a narrow width equal to the thickness of the member forming the shell SH is continuous, desired flexibility can be exhibited. Therefore, in the chair using the shell SH, the wavy rib 4 of the seat corresponding portion 1 of the shell SH may be used when the user moves the lower limb backward while sitting.
1, a load is applied in a direction D2 perpendicular to the longitudinal direction D1, so that the wavy rib 41 is curved and the front edge portion 11 of the seat corresponding portion 1 is lowered. Therefore, the front edge of the seat is tilted downward so that the user's thighs can be reduced from being pressed by the seat.

When the upper body is greatly warped backward in the seated state, a load is similarly applied to the wavy rib 41 of the backrest corresponding portion 2 in a direction D2 perpendicular to the longitudinal direction D1. The wavy rib 41 is curved and the upper edge 21 of the backrest corresponding portion 2 falls backward. As a result, the upper edge of the backrest tilts toward the lower rear side, so that the body can be easily relaxed. Further, when the user sits deeply on the seat, the wavy rib 41 of the connecting portion 3 is deformed, and the connecting portion 3
The central part of the body is slightly displaced rearward, and is deformed into a shape according to the body shape of the user, and the sitting comfort is improved as compared with the flat shell shape. In other words, even in a chair in which the back support rod does not tilt rearward, the upper end portion of the backrest can be tilted, and a configuration in which the backrest can take a relaxed posture like a chair in which the backrest tilts can be adopted. .
In addition, the front edge of the seat corresponding portion 1 also tilts when a load is applied to the front downward direction, so that it is possible to prevent the user's thigh from feeling tight. In addition, even in such a flat shell SH shape, a wavy rib 41 is formed in the connecting portion 3 between the seat corresponding portion 1 and the backrest corresponding portion 2 in the vertical direction, so that the connection is made when the seat is seated. Since the central part of the part 3 expands substantially in the left-right direction and moves backward, it can be deformed into a shape that easily matches the curve of the body.

Next, another embodiment of the present invention will be described with reference to FIG. The shell SH2 shown in FIG. 4 is a chair in which a seat and a backrest are separated from each other.
And a backrest shell 120. Seat shell 110
Is mounted on the pillar of the support unit (not shown),
Further, the backrest shell 120 is attached to a back support rod extending upward and rearward from the support unit.

The seat shell 110 has a substantially quadrangular shape, and is provided with wavy ribs 41 at right and left portions of the front edge 111 at a predetermined angle with respect to the front edge 111. That is, the wavy ribs 41 are provided so as to widen toward the left and right sides while retreating from the central portion of the front edge portion 111 when viewed from the front side. Further, the backrest shell 120 is also substantially rectangular, and the upper edge 1
22 has a wavy rib 41 that expands obliquely downward from left to right from the center.

As described above, since the backrest shell 120 has the wavy ribs 41 formed so as to be inclined with respect to the upper edge portion 122, the backrest shell 120 has the same strength in the vertical direction as the normal shell, Since the direction is a direction D2 perpendicular to the longitudinal direction D1 of the wavy rib 41, when a load is applied in such an obliquely upward direction, a portion above the wavy rib 41 will tilt. Similarly, the seat shell 110 also has the front edge 1
Since the wavy ribs 41 are formed in an inclined state with respect to 11, the strength required for the seat is ensured in the front-rear direction, and in addition, the pressure on the thigh is reduced in the diagonally forward direction so as to reduce the pressure on the thigh. To be able to tilt.

The present invention is not limited to the embodiment described above. For example, the wavy ribs 141 provided on the left and right portions of the front edge portion 111 of the seat shell 110 in the above-described other embodiment are, as shown in FIG.
It may be curved along the curve a. Since the wavy ribs 141 are formed in a curved shape as described above, the seat shell 110 does not tilt only in the directions of the left and right front edge corners 111a as in the other embodiments described above. It also tilts forward. That is, the tilting direction is not one direction, but the wavy rib 14.
The leading edge corner 111a tilts in all directions perpendicular to 1. Therefore, the movement of the leading edge corner portion 111a at the time of tilting becomes flexible, and the pressure on the thigh can be reduced without being affected by the posture of the user or the position of the leg. Note that the length of the straight portion of the wavy rib 141 does not need to be the same in the left-right direction and the depth direction, and may be set according to the purpose. Further, such curved wavy ribs 141 may be formed near the left and right corners of the backrest shell 120.

The cross-sectional shape of the unit rib 41a of the wavy rib 41 may be, for example, a sine wave shape or a continuous semi-circular shape in addition to the rectangular shape described above. Is also good. The number of the unit ribs 41a in the case of the wavy ribs 41 does not need to be six in the case of the above-described embodiment, and the number is determined in accordance with the strength required for the shell SH and the required flexibility. It may be decided. The same applies to the curved wavy rib 141.

Further, the seat corresponding portion 1 as in the above embodiment is used.
SH formed integrally with the backrest corresponding part 2
May be formed on both the inner shell attached to the back side of the cushion and the outer shell that attaches the inner shell to the support unit including the back support rod and the legs.

In addition, in the above embodiment, in the shell SH integrated with the back seat, the portion 1 corresponding to the seat and the portion 2 corresponding to the backrest are provided.
And the connecting portions 3 are formed with the wavy ribs 41 respectively.
May be formed, and it is not always necessary to form the wavy ribs 41 at a plurality of locations. That is, the wavy rib 4
1 is to make a part of the shell SH which normally does not easily tilt tilt only when a load is applied in a predetermined direction. Depending on the use of the chair using the shell SH, it is necessary to use the shell SH. It is provided at a location.

In addition, the configuration of each section is not limited to the illustrated example, and various modifications can be made without departing from the spirit of the present invention.

[0020]

According to the present invention, as described in detail above, the rib structure has rigidity in one direction and flexibility in a direction perpendicular to the one direction. Thus, it is possible to form a structure capable of tilting a desired portion in a desired direction while maintaining strength in one direction. And
Position the rib structure in the shell plane excluding the outer edge of the shell.
The distance between the outer edge of the shell and the end of the rib structure
To set a wide range of strength characteristics of the shell.
In addition, including the fact that the ridge of the unit rib is hollow,
The shell can be partially provided with rigidity and flexibility. Accordingly
Can be finely elastically deformed according to the unevenness of the human body
You can get a shell and have a more comfortable sitting
Can provide chair.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view showing a main part of the embodiment.

FIG. 3 is an enlarged perspective view showing a shape when a wavy rib of the embodiment is bent.

FIG. 4 is a perspective view showing another embodiment of the present invention.

FIG. 5 is a perspective view showing still another embodiment of the present invention.

[Explanation of symbols]

 SH shell 4 rib structure 41 wavy rib 41 a unit rib 41 b ridge 41 c groove

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-115329 (JP, A) JP-A-4-250116 (JP, A) JP-A-56-63312 (JP, A) JP-A-2- 57207 (JP, A) JP-A-2-57208 (JP, A) JP-A-2-63416 (JP, A) JP-A-5-115329 (JP, A) JP-A-4-200410 (JP, A) Japanese Utility Model No. 1-128463 (JP, U) Japanese Utility Model No. 57-123056 (JP, U) Japanese Utility Model Utility Model No. 58-90157 (JP, U) Japanese Utility Model Utility Model No. 60-158445 (JP, U) Japanese Utility Model Utility Model No. 2-36346 (JP, U) Special Table Hei 5-505330 (JP, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) A47C 7/00

Claims (4)

(57) [Claims] 1. A chair shell supporting the cushion has a stiffness against bending in one direction, and flexible for bending in the direction perpendicular to the direction of its one The rib structure is located in the shell surface excluding the outer edge of the shell, and comprises a plurality of unit ribs arranged in a row at a right angle to the one direction. A chair shell, wherein the unit rib is formed by continuously forming a hollow ridge and a concave groove. 2. An outer shape of a cross section of the ridge is rectangular.
The chair shell according to claim 1, characterized in that: 3. The unit rib according to claim 1, wherein the unit rib is linear.
A chair shell according to claim 1 or 2, characterized in that: 4. The method according to claim 1, wherein the unit rib is curved.
A chair shell according to claim 1 or 2, characterized in that: