WO2015098682A1

WO2015098682A1 - Load support member for furniture

Info

Publication number: WO2015098682A1
Application number: PCT/JP2014/083523
Authority: WO
Inventors: 益永　浩
Original assignee: 株式会社岡村製作所
Priority date: 2013-12-24
Filing date: 2014-12-18
Publication date: 2015-07-02
Also published as: CN105744860B; JP2015119863A; CN105744860A; JP6312299B2

Abstract

A load support member for furniture, having provided therein a first side wall (13) and a second side wall (14) that are arranged mutually facing. The inside surfaces of the first side wall (13) and the second side wall (14) have protruding therefrom first reinforcing ribs (17) and second reinforcing ribs (18), respectively, said reinforcing ribs having a straight line section that protrudes in a direction orthogonal to the extension direction of each side wall (13, 14). The first reinforcing ribs (17) and the second reinforcing ribs (18) are coupled by slanting coupling ribs (19).

Description

Load bearing member for furniture

The present invention relates to a load support member for furniture such as a leg of an office chair.

Some office chair legs are provided with a plurality of legs, which are load supporting members, radially at the lower end of a pedestal containing a gas spring. As a structure of this type of chair leg, there has been devised various structures for improving bending rigidity and torsional rigidity with respect to load input from above (for example, see Patent Documents 1 and 2).

In the leg (load support member) described in Patent Document 1, a plurality of inclined ribs that are inclined with respect to the extending direction of the side walls are connected between a pair of side walls (load support walls) that are arranged to face each other. It is installed. Two inclined ribs having different inclination directions form a pair, and the members forming the pair intersect each other at a substantially central position in the width direction of the pair of side walls.
The leg described in Patent Document 1 is reinforced by a pair of inclined ribs in which a pair of side walls, which are load supporting walls, are inclined in opposite directions, thereby improving bending rigidity and torsional rigidity.

The leg (load support member) described in Patent Document 2 is provided with two pairs of longitudinal ribs substantially parallel to the side walls between a pair of side walls (load support walls) arranged to face each other. A pair of longitudinal ribs are connected by a plurality of short ribs.
The leg described in Patent Document 2 is reinforced by two pairs of long ribs in which an internal space between a pair of side walls is connected by short ribs, thereby improving bending rigidity and torsional rigidity.

No. 04-014040 Japanese Patent No. 4067229

However, since the load supporting member described in Patent Document 1 has a structure in which the inclined rib is connected to the inner surface of the side wall, the area of the connecting portion between the inclined rib and the side wall is large, and the material is used when molding the load supporting member. With the cooling, sink marks are likely to occur in the vicinity of the connecting portions of the side walls with the inclined ribs, and when the sink marks are large, there is a concern that the appearance of the side walls exposed to the outside may deteriorate.

Moreover, although the load supporting member described in Patent Document 2 is less likely to cause sink marks on the side wall exposed to the outside, two pairs of long ribs connected by short ribs are arranged in the internal space between the pair of side walls. Therefore, the strength of the side wall itself could not be sufficiently increased.

In view of this, the present invention enables the occurrence of sink marks on the load supporting wall due to the reinforcing ribs as much as possible while securing the strength of the load supporting walls by connecting reinforcing ribs on the inner side surfaces of the pair of load supporting walls. An object of the present invention is to provide a load supporting member for furniture that can be suppressed.

In order to solve the above-described problems, a load support member for furniture according to the present invention includes a first load support wall, a second load support wall, and a first load support wall that are arranged to face each other. A first reinforcing rib having a straight portion protruding in a direction perpendicular to the longitudinal direction of the first load supporting wall toward the second load supporting wall; and from the second load supporting wall toward the first load supporting wall. A second reinforcing rib having a straight portion protruding in a direction perpendicular to the longitudinal direction of the second load supporting wall, the first reinforcing rib and the second reinforcing rib, the first load supporting wall and the second And an inclined connecting rib that is connected in an inclined state with respect to the longitudinal direction of the load support wall.
With this configuration, the first load support wall and the second load support wall that are opposed to each other are connected by the first and second reinforcing ribs and the inclined connection rib that connects them obliquely. Flexural rigidity and torsional rigidity are increased. Further, since the first reinforcing rib and the second reinforcing rib are connected to the first load supporting wall and the second load supporting wall by a straight portion perpendicular to the longitudinal direction of these supporting walls, respectively, the first load supporting wall is provided. The area of the connection part with respect to a wall and the 2nd load support wall becomes small. For this reason, when the load supporting member is molded, the first load supporting wall and the second load supporting wall are less likely to have sink marks due to the first and second reinforcing ribs.

A plurality of the inclined connecting ribs may be provided, and at least two of the inclined connecting ribs may be inclined in opposite directions.
In this case, since at least two inclined connecting ribs having opposite inclination directions are disposed between the first load supporting wall and the second load supporting wall, when a load is input from the outside to the load supporting member, The deformation in the direction in which the separation distance between the first load support wall and the second load support wall changes and the deformation in the twist direction are efficiently regulated. As a result, the strength of the first and second load support walls is further increased.

At least one of the first reinforcing rib and the second reinforcing rib may be connected to a pair of inclined connecting ribs that are inclined in opposite directions.
In this case, a load is input from the pair of inclined connecting ribs to the reinforcing ribs connected to the pair of inclined connecting ribs that are inclined in opposite directions, and the reinforcing ribs of the respective input loads are collapsed. The component forces in the direction of deformation cancel each other. For this reason, the reinforcing rib is unlikely to fall down and deform, and the rigidity and strength of the entire load supporting member are further increased.

Furthermore, a pair of inclined connecting ribs may be connected to at least one of the first reinforcing rib and the second reinforcing rib at different positions in the extending direction.
In this case, since the connection part with the inclination connection rib on a reinforcement rib is disperse | distributed in multiple places, the increase in the volume of each connection part is suppressed. Therefore, when the load supporting member is molded, the occurrence of sink marks on the first load supporting wall and the second load supporting wall due to the cooling of the material is further reduced.

In addition, the first load support wall and the second load support wall are connected by a connection wall that is substantially orthogonal to the opposing surfaces of the first load support wall, the second load support wall, and the connection wall. It is preferable that the first reinforcing rib, the second reinforcing rib, and the inclined connecting rib are arranged in a space surrounded by the rim.
In this case, since the first load support wall and the second load support wall are connected by a connection wall that is substantially orthogonal to the opposing surface, the first load support wall and the second load support wall are close to each other or separated from each other. Directional deformation is efficiently regulated. And since the 1st reinforcement rib, the 2nd reinforcement rib, and the inclination connection rib are arranged in the space part surrounded by the 1st load support wall, the 2nd load support wall, and the connection wall, the meat of these ribs The thickness can be made thinner. For this reason, it is possible to further suppress the occurrence of sink marks on the first load support wall and the second load support wall during molding.

The first load support wall and the second load support wall are connected to each other so as to form an obtuse angle with respect to the connecting wall, and the first reinforcing rib and the second reinforcing rib are approximately In addition to being formed in a right triangle shape, each inclined side may be connected to the first load support wall and the second load support wall over almost the entire upper and lower regions.
In this case, the first reinforcing rib and the second reinforcing rib can be firmly installed on the inner surfaces of the first load supporting wall and the second load supporting wall without increasing the size of the load supporting member. In addition, the extending length in the width direction of the first and second reinforcing ribs can be increased in a region where the separation width between the first load supporting wall and the second load supporting wall that is easily noticeable from the outside increases. Further, the occurrence of sink marks at this portion during molding can be further suppressed.

According to the present invention, since the first load support wall and the second load support wall that face each other are connected by the first and second reinforcing ribs and the inclined connection rib, the first load support wall and the second load support wall are connected. The bending rigidity and the torsional rigidity of the load supporting wall can be increased, and the first and second reinforcing ribs are supported by the first load supporting wall and the straight portion perpendicular to the longitudinal direction of the second load supporting wall. Since the area of the connecting portion between the first and second load supporting walls and the first and second reinforcing ribs is reduced, the first load supporting wall and the second load supporting wall are connected to the wall and the second load supporting wall. 2 It is possible to suppress the occurrence of sink marks on the load support wall as much as possible.

It is a perspective view of the chair of 1st Embodiment of this invention. It is a partial section side view of the many legs of the chair of a 1st embodiment of this invention. It is a bottom view of the many legs of the chair of 1st Embodiment of this invention. It is an enlarged view of the IV section of FIG. 3 of the leg of the first embodiment of the present invention. FIG. 5 is a cross-sectional view corresponding to the VV cross section of FIG. 4 of the leg according to the first embodiment of the present invention. It is a bottom view of the many legs of the chair of 2nd Embodiment of this invention. It is an enlarged view of the VII part of FIG. 6 of the leg of 2nd Embodiment of this invention. It is a bottom view of the leg of 3rd Embodiment of this invention. It is a bottom view of the leg of the modification of 1st Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings. In the main embodiment described below, the legs of the office chair constitute the load supporting member.
In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person seated in a normal posture on the chair is called “left”, and the direction opposite to that is called “right”.

First, the first embodiment shown in FIGS. 1 to 5 will be described.
Drawing 1 is a figure which looked at chair 1 of this embodiment from back diagonally upward.
As shown in the figure, a chair 1 according to this embodiment includes a leg 2 placed on a floor, a box-shaped support base 3 installed at the upper end of the leg 2, and a seat on which a seated person sits. A body 4, a seat receiving member 5 that is attached to the upper surface of the support base 3 and supports the seat body 4, and a backrest that supports the back of a seated person who extends from the support base 3 to the rear upper side and sits on the seat body 4. Part 6.

The leg body 2 includes a multi-leg 9 with casters 9a and a pedestal column 10 that stands up from the center of the multi-leg 9 and incorporates a gas spring that is an elevating mechanism. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 10 and a tilt adjustment mechanism for the backrest 6.

The multi-leg 9 includes a central boss portion 11 for inserting and supporting the pedestal column 10 therein, and a plurality of legs 12 extending radially outward from the boss portion 11. A caster 9a is attached to the main body. The diversified legs 9 are integrally formed of resin as a whole, and all the legs 12 have the same structure. In the case of this embodiment, each leg 12 constitutes a load support member that supports the load acting on the pedestal 10 between the boss portion 11 and the casters 9a.

FIG. 2 is a side view of a part of the multi-leg 9 having a cross section of the boss portion 11, and FIG. 3 is a bottom view of a part of the multi-leg 9. 4 is an enlarged view of the IV part of FIG. 3, and FIG. 5 is a cross-sectional view corresponding to the VV cross section of FIG.
As shown in these drawings, the legs 12 are opposed to the first side wall 13, the second side wall 14, the first side wall 13, and the second side wall 14 that extend in a radial direction from the boss portion 11. And an upper wall 15 that connects the upper portions of the first and

second side walls

13 and 14 substantially orthogonally to each other. As shown in FIG. 5, the first and

second side walls

13, 14 and the upper wall 15 are formed to have a substantially U-shaped cross-sectional shape with the opening facing downward. Therefore, a space 20 surrounded by the first and

second side walls

13 and 14 and the upper wall 15 is formed inside the leg 12.

Moreover, the 1st side wall 13 and the 2nd side wall 14 incline so that the obtuse angle may be made with respect to the upper wall 15, and it spreads from the upper end part to the lower end part so that it may be slightly divergent. One end in the longitudinal direction of the first and

second side walls

13 and 14 and the upper wall 15 is connected to the boss 11 for supporting the pillar, and the other end in the longitudinal direction is connected to the boss 16 for attaching the casters. Yes. Here, of the legs 12, the side on which the boss 11 for supporting the pillars is located is referred to as the base end side, and the side on which the caster mounting boss 16 is located is referred to as the distal end side. The separation width between the first side wall 13 and the second side wall 14 is slightly tapered from the base end side of the leg 12 toward the front end side.
In this embodiment, the first side wall 13 constitutes a first load support wall, the second side wall 14 constitutes a second load support wall, and the upper wall 15 constitutes a connection wall.

A plurality of first reinforcing ribs 17 projecting in a direction perpendicular to the longitudinal direction of the first side wall 13 toward the second side wall 14 on the inner side surface (the surface on the side facing the second side wall 14) of the first side wall 13. Is protruding. The plurality of first reinforcing ribs 17 are arranged on the inner side surface of the first side wall 13 so as to be spaced apart in the longitudinal direction. The first reinforcing ribs 17 are formed in a substantially right triangle shape in cross section, and the inclined sides thereof are connected over almost the entire upper and lower sides of the inclined inner surface of the first side wall 13.
In the case of this embodiment, the entirety of the first reinforcing rib 17 constitutes a straight portion protruding in a direction orthogonal to the longitudinal direction of the first side wall 13 (first load support wall).

A plurality of second reinforcing ribs 18 projecting in the direction perpendicular to the longitudinal direction of the second side wall 14 toward the first side wall 13 on the inner side surface (the surface facing the first side wall 13) of the second side wall 14. Is protruding. The plurality of second reinforcing ribs 18 are arranged on the inner side surface of the second side wall 14 in the longitudinal direction and at positions shifted in the longitudinal direction from the first reinforcing rib 17 on the first side wall 13 side. That is, the first reinforcing ribs 17 and the second reinforcing ribs 18 are arranged in a zigzag manner in the longitudinal direction of the legs 12 so as to protrude alternately from opposite directions between the first side wall 13 and the second side wall 14. Has been. Similarly to the first reinforcing rib 17, the second reinforcing rib 18 is formed in a substantially right-angled triangle shape in sectional view, and the inclined side thereof is connected over almost the entire upper and lower sides of the inclined inner surface of the second side wall 14. Yes.
In the case of this embodiment, the whole 2nd reinforcement rib 18 comprises the linear part which protrudes in the direction orthogonal to the longitudinal direction of the 2nd side wall 14 (2nd load support wall).

Further, between the first side wall 13 and the second side wall 14, an inclined connection rib 19 that connects the protruding ends of the adjacent first reinforcing rib 17 and second reinforcing rib 18 is disposed. The inclined connecting rib 19 is a rib that is inclined with respect to the longitudinal direction of the first and

second side walls

13 and 14, is formed at substantially the same height as the first and

second side walls

13 and 14, and the upper end portion is the upper wall. 15 is connected to the lower surface. A pair of inclined connecting ribs 19 that are inclined in opposite directions are connected to the projecting ends of the first reinforcing ribs 17. Similarly, a pair of inclined connecting ribs 19 that are inclined in opposite directions are connected to the protruding ends of the second reinforcing ribs 18. Accordingly, the first and second reinforcing

ribs

17 and 18 arranged in a staggered pattern along the longitudinal direction on the first and

second side walls

13 and 14 have a plurality of inclinations that change the inclination angle in a zigzag shape along the longitudinal direction. They are connected by connecting ribs 19.

The first reinforcing rib 17 positioned on the most proximal side of the leg 12 is connected to the other end of the inclined connecting rib 19 whose one end is connected to the boss 11 for supporting the pillars. The second reinforcing rib 18 located on the most distal end side is connected to the other end portion of the inclined connecting rib 19 whose one end portion is connected to the caster mounting boss portion 16.
Further, in the leg 12 of this embodiment, the thickness of the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19 that reinforce the

side walls

13 and 14 between the first side wall 13 and the second side wall 14 is as follows. The wall thickness is set to be thinner than half the wall thickness of the first and

second side walls

13 and 14.
In this embodiment, the thickness of the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19 is set to be thinner than half the thickness of the first and

second side walls

13 and 14. However, the thickness of the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19 may be approximately half or less than the thickness of the first and

second side walls

13 and 14.

Further, the first reinforcing rib 17 and the second reinforcing rib 18 are all set to have substantially the same length of protrusion from the first and

second side walls

13 and 14, and the first and second reinforcing

ribs

17 and 18 in the longitudinal direction of the leg 12. The projecting pitch of the second reinforcing

ribs

17 and 18 gradually narrows from the proximal end side of the leg 12 toward the distal end side. For this reason, the length of the inclined connecting rib 19 that connects the adjacent first reinforcing rib 17 and the second reinforcing rib 18 is generally shorter at the end of the leg 12. Therefore, in this leg 12, the inclination angle of each inclination connection rib 19 is similarly ensured, while ensuring the protrusion length of each

reinforcement rib

17 and 18 fully.

Since the leg 12 employed in the chair 1 is configured as described above, the strength of the first and

second side walls

13 and 14 is directly increased by the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19. Can be increased. That is, in the leg 12, the first and

second side walls

13 and 14 facing each other are protruded in a direction orthogonal to the first and

second side walls

13 and 14, and the first and second reinforcing

ribs

17 and 18. Since the projecting ends of the adjacent first and second reinforcing

ribs

17 and 18 are connected to each other by an inclined connecting rib 19 that obliquely connects the inclined connecting rib 19 between the first side wall 13 and the second side wall 14. It functions as a brace, whereby the bending rigidity and torsional rigidity of the first and

second side walls

13 and 14 are efficiently increased.

On the other hand, in the leg 12 of this embodiment, the first and second reinforcing

ribs

17 and 18 connected to the inclined connecting rib 19 protrude from the first and

second side walls

13 and 14 in the orthogonal direction, respectively. The area of each connection part of the 1st,

2nd reinforcement ribs

17 and 18 with respect to the 1st,

2nd side walls

13 and 14 becomes small. For this reason, sink marks are less likely to occur on the outer surfaces of the first and

second side walls

13 and 14 due to the cooling of the material when the legs 12 (multiple legs) are molded. That is, when the legs 12 are molded, sink marks are easily generated in the lump portion when the molten material is cooled, but the first and second reinforcing ribs are formed on the inner side surfaces of the first and

second side walls

13 and 14. Since the first and

second side walls

13 and 14 and the first and second reinforcing

ribs

17 and 18 are less likely to be agglomerated, the first and

second side walls

13 and 14 are less likely to be agglomerated. Sinks due to the second reinforcing

ribs

17 and 18 are unlikely to occur. In particular, in this embodiment, the thickness of the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19 is set to be less than half the thickness of the first and

second side walls

13 and 14, so The effect of suppressing the occurrence of sink marks at the first and

second side walls

13 and 14 is increased.
Therefore, in the leg 12 according to this embodiment, the first side wall 13 and the second side wall 14 are sinked at the time of molding, while improving the bending rigidity and torsional rigidity of the first and

second side walls

13 and 14. Can be suppressed as much as possible. Since the appearance of the leg 12 is prevented from being deteriorated due to sink marks, it is possible to use a material with a light color (for example, white or light gray) that has been difficult to select as the material color of the legs 12 due to the occurrence of sink marks. become.

By the way, the above effect is that the first reinforcing rib 17 and the second reinforcing rib 18 project from the inner surfaces of the first side wall 13 and the second side wall 14, respectively, and the first reinforcing rib 17 and the second reinforcing rib 18 are inclined. Although it can be obtained if at least one inclined connecting rib 19 is connected, in this embodiment, a plurality of inclined connecting ribs 19 are provided, and at least two inclined connecting ribs 19 are inclined in opposite directions. Due to the structure, when a load is input from the outside to the first and

second side walls

13 and 14, the deformation in the direction in which the distance between the first side wall 13 and the second side wall 14 changes or the deformation in the twist direction Can be regulated efficiently.

Furthermore, in the case of this embodiment, the first reinforcing rib 17 and the second reinforcing rib 18 are connected to a pair of inclined connecting ribs 19 that are inclined in opposite directions, and thus a pair of inclined connecting ribs 19. There is an advantage that the first reinforcing rib 17 and the second reinforcing rib 18 connected to each other are less likely to fall down and deform when a load is input. That is, for example, when a load is input from the side of the first and

second side walls

13 and 14, the first reinforcing rib 17 and the second reinforcing rib 18 have a pair of inclined connecting ribs opposite to each other in the inclined direction. The load is similarly input from 19, but at this time, the component forces in the direction in which the first reinforcing rib 17 and the second reinforcing rib 18 fall down and deform among the input loads are mutually canceled. For this reason, the 1st reinforcement rib 17 and the 2nd reinforcement rib 18 are hard to fall down, and the rigidity and intensity | strength of the leg 12 whole increase more.

Further, in the leg 12 of this embodiment, the upper ends of the first side wall 13 and the second side wall 14 are connected by an upper wall 15 that is substantially orthogonal to the opposing surfaces of the first side wall 13 and the second side wall 14. Since the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19 are disposed in the space 20 surrounded by the upper wall 15, the approaching and separating directions of the first and

second side walls

13 and 14 are arranged. Can be efficiently regulated by the upper wall 15 having a sufficient thickness, and the thickness of the first and second reinforcing

ribs

17 and 18 and the inclined connecting rib 19 can be made thinner. Therefore, the occurrence of sink marks on the first and

second side walls

13 and 14 at the time of molding can be further suppressed.

Furthermore, in the leg 12 of this embodiment, the first side wall 13 and the second side wall 14 are connected so as to form an obtuse angle with respect to the upper wall 15, and the first and second reinforcing ribs having a substantially right triangle shape. Since the inclined sides of the first side wall 13 and the second side wall 14 are connected to almost the entire upper and lower sides of the first side wall 13 and the second side wall 14, the first and second reinforcing

ribs

17, 18 can be firmly installed inside the first side wall 13 and the second side wall 14. Further, since the protruding lengths of the first and second reinforcing

ribs

17 and 18 from the first and

second side walls

13 and 14 gradually increase from the upper end toward the lower side, they spread in a divergent shape and are visible from the outside. The occurrence of sink marks in the lower edge regions of the first and

second side walls

13 and 14 that are easy to hit can be further suppressed.

Next, a second embodiment shown in FIGS. 6 and 7 will be described. In each embodiment and modification described below, the same reference numerals are given to common portions with the first embodiment, and redundant description will be omitted.
The leg 112 (load supporting member) of this embodiment has a first reinforcing rib 17 and a second reinforcing rib 18 protruding from the inner side surfaces of the first side wall 13 and the second side wall 14 as in the first embodiment. The upper part of the 1st side wall 13 and the 2nd side wall 14 is connected by the upper wall (not shown). However, the connection mode of the

inclined connection ribs

19A and 19B for connecting the first reinforcing rib 17 and the second reinforcing rib 18 obliquely to the reinforcing

ribs

17 and 18 is different from that of the first embodiment.

One end portion of the inclined connecting rib 19A inclined in one direction is connected to the protruding end 18a of the second reinforcing rib 18, and the other end portion of the inclined connecting rib 19A is a midway portion 17b in the extending direction of the first reinforcing rib 17. It is connected to. One end portion of the inclined connecting rib 19B inclined to the other is connected to the protruding end 17a of the first reinforcing rib 17, and the other end portion of the inclined connecting rib 19B extends in the extending direction of the adjacent second reinforcing rib 18. It is connected to the middle part. That is, in the leg 112 of this embodiment, the inclined connecting

ribs

19A and 19B having different inclinations are connected to different positions in the extending direction of the first and second reinforcing

ribs

17 and 18, respectively.

Therefore, in the leg 112 of this embodiment, the same basic effects as those of the first embodiment can be obtained, and the first and second reinforcing

ribs

17 and 18 can be obtained by connecting the inclined connecting

ribs

19A and 19B. Since the connecting portions are dispersed at a plurality of locations, an increase in the volume of each connecting portion can be suppressed. For this reason, it is possible to further suppress the occurrence of sink marks on the first side wall 13 and the second side wall 14 when the legs 112 are molded.

FIG. 8 is a diagram showing a third embodiment of the present invention.
The leg 212 of the third embodiment does not connect the inclined connecting ribs having different inclination directions to the common reinforcing rib, but the first and second ends of the inclined connecting

ribs

19A and 19B having different inclination directions. It connects with the extension end of the different 1st,

2nd reinforcement ribs

17 and 18 on the

side walls

13 and 14. FIG.

In the leg 212 of this embodiment, substantially the same basic effects as those of the first embodiment can be obtained, and each of the first and second reinforcing

ribs

17 and 18 has a plurality of inclined connecting ribs. Since 19 is not connected, the occurrence of sink marks on the first side wall 13 and the second side wall 14 when the legs 212 are molded can be further suppressed.

FIG. 9 is a view showing a modification of the first embodiment of the present invention.
In the basic form shown in FIGS. 3 and 4, the entire first reinforcing rib 17 and the second reinforcing rib 18 protrude linearly from the first side wall 13 and the second side wall 14 in the orthogonal direction. The leg 312 is bent at an obtuse angle at the straight portion 317a in which the first and second reinforcing

ribs

317 and 318 project linearly in the orthogonal direction from the first and

second side walls

13 and 14, and at the tip of the straight portion 317a. And a pair of inclined connecting ribs 19 having different inclination directions are connected to the tip of each bent portion 317b.
In the case of this modified example, substantially the same effect as that of the basic form can be obtained.

The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the scope of the invention. For example, in the above embodiment, the first side wall that is the first load support wall and the second side wall that is the second load support wall are connected by the upper wall that is the connection wall. The connecting wall is not always necessary, and a structure without the connecting wall can be adopted. Moreover, although each said embodiment demonstrated the leg of the office chair as an example of the load support member for furniture, the leg and the top-plate support member which face the front-back direction of a desk with the same basic structure, and the front and back of a shelf It is also possible to employ a shelf plate support member or the like that faces the direction.

12, 112, 212, 312 legs (load support members)
13 1st side wall (1st load support wall)
14 Second side wall (second load support wall)
15 Upper wall (connection wall)
17,317 First reinforcing rib 18,318

Second reinforcing rib

19, 19A, 19B Inclined connecting rib 20 Space portion

Claims

A first load support wall and a second load support wall disposed opposite to each other;
A first reinforcing rib having a straight portion protruding from the first load supporting wall toward the second load supporting wall in a direction perpendicular to the longitudinal direction of the first load supporting wall;
A second reinforcing rib having a straight portion protruding in a direction orthogonal to the longitudinal direction of the second load support wall from the second load support wall toward the first load support wall;
An inclined connecting rib for connecting the first reinforcing rib and the second reinforcing rib in an inclined state with respect to the longitudinal direction of the first load supporting wall and the second load supporting wall;
A load supporting member for furniture, comprising:
A plurality of the inclined connecting ribs;
The load supporting member for furniture according to claim 1, wherein each of the at least two inclined connecting ribs is inclined in opposite directions.
The furniture according to claim 2, wherein a pair of the inclined connecting ribs that are inclined in opposite directions are connected to at least one of the first reinforcing rib and the second reinforcing rib. Load support member.
The furniture according to claim 3, wherein a pair of the inclined connecting ribs are connected to at least one of the first reinforcing rib and the second reinforcing rib at different positions in the extending direction. Load bearing member.
The first load support wall and the second load support wall are connected by a connection wall that is substantially orthogonal to the opposing surface of both, and surrounded by the first load support wall, and the second load support wall and the connection wall. The load for furniture according to any one of claims 1 to 4, wherein the first reinforcing rib, the second reinforcing rib, and the inclined connecting rib are disposed in the space. Support member.
The first load support wall and the second load support wall are connected to each other so as to form an obtuse angle with respect to the connecting wall, and the first reinforcing rib and the second reinforcing rib are approximately 6. It is formed in the shape of a right triangle, and each inclined side is connected to the said 1st load support wall and the said 2nd load support wall over the up-and-down substantially whole region, The Claim 6 characterized by the above-mentioned. Load bearing member for furniture.