JPH04101652U - chair backrest device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a backrest body in a simple form that elastically supports a backrest load and fits a person's back. [Structure] The backrest body 4 is formed into a shell shape from an elastic material such as a hard synthetic resin, and the backrest body 4 has a cavity 5 that allows the backrest body 4 to easily bend and deform toward the rear. , provided at one location or multiple locations at appropriate intervals above and below. Furthermore, a rib portion 6 is formed on the periphery of the backrest body 4, excluding the portion 4a at the height of the void space 5, so as to prevent the rib portion 6 from bending backward and deforming. backrest body 4
However, since the backrest body 4 is bent and deformed at the height position of each space 5, the backrest body 4 can be fitted to the back of a person, and the backrest load can be elastically reduced by the elastic restoring force of the backrest body 4 itself. Supported by

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a chair equipped with a backrest that elastically supports the backrest load. When a person leans on the backrest body of a child, the backrest body is This invention relates to a backrest device that can be adapted to fit the deformation of one half of the body.

0002

[Conventional technology]

The backrest of a chair generally has its lower end pivoted to the rear of the backrest. By doing so, it is configured to be able to freely tilt backward, and this backward tilting is controlled by a spring body such as a coil spring. Although it is configured to elastically support the chair, if the person sitting on the chair When a person leans back, the upper body of a person tends to curve backwards in a concave shape when viewed from the side. In contrast, the backrest body of a general chair is formed so that it cannot be bent or deformed. As a result, the surface pressure of the person's back against the backrest body is greatly reduced at the upper part of the backrest body. In other words, the backrest body becomes smaller and uneven in the part of the person's back. Even if you do not fit properly and lean against the backrest, you will not be able to achieve a sufficient state of comfort. The problem was that it couldn't be done.

0003 On the other hand, Japanese Patent Publication No. 56-42922 as prior art discloses The backrest body is separated into multiple backrest pieces arranged in upper and lower multi-tiered form. The lower adjacent backrest pieces are connected by a connecting device that uses an eccentric cam and an eccentric gear. In this way, the angle formed by the two vertically adjacent backrest pieces can be freely adjusted. This allows the side shape of the backrest body to be set to fit the shape of the person's back. It describes an idea that made it possible to do so.

0004

[Problem that the idea aims to solve]

However, the backrest body in this prior art does not tilt backward even when a person leans back. Because it is a fixed type, the backrest body in this prior art can be used for ordinary office use. To configure a chair so that it tilts back when a person leans back, the backrest body must be A spring that pivots the lower end of the seat to the seat, etc., and elastically supports the backward tilting of the backrest. In addition to having to provide a separate body and the structure of the backrest body being complicated, Since a member is required to elastically support the leaning load, the overall structure of the backrest device is The structure becomes extremely complex. Moreover, the backrest body in this prior art has a side shape that is vertical to the upper body. The backrest can only be set to fit a person's back in the shape of a Since the body does not elastically deform under the load of the backrest, the backrest in this prior art Even if the leaning body is configured so that it can be tilted backwards, it will not fit the back of the person who is leaning backwards. It was impossible to do so. The present invention elastically supports the backrest load, and also allows the backrest body to be attached to the person's back. We provide a backrest device that allows you to fit your body in an extremely simple form. The purpose is to

[0005]

[Means to solve the problem]

In order to achieve this purpose, the present invention has a hard synthetic resin for the rear part of the seat body of the chair. A shell-shaped backrest made of an elastic material such as The backrest elastically bends backwards in the area inside the right side edges. While providing one space or multiple spaces at appropriate intervals above and below, the front At least on both left and right sides of the periphery of the backrest body, there is a part inside the periphery. A rib part that bends backwards and is less likely to deform is placed on both the left and right sides of the space. The structure is such that it extends except for the side parts.

[0006]

[Action/effect]

Generally, the left and right width of a person's back is smaller than the left and right width of the backrest. Therefore, the backrest load acts on the parts inside the left and right edges of the backrest body. Therefore, the backrest body bends in a convex shape toward the rear in plan view due to the backrest load. Therefore, the backrest body is simply formed from an elastic board. In a configuration where the backrest body is only slightly bent, the backrest body is concave backward in side view against its elasticity. It becomes difficult to bend and deform the shape.

[0007] However, in the present invention, the backrest body has a structure that allows the backrest body to easily bend backward. One or more spaces are provided at appropriate intervals above and below, and the back is also The peripheral rib part of the hanging body is shaped except for the part at the height corresponding to the void. The height of the backrest body at the height corresponding to the empty space is Because the left and right edges tend to deform elastically backwards, a person's back curves when leaning backwards. Depending on the curved shape, the backrest load is applied to the upper part of the backrest body. If the pressure is stronger and weaker on the lower side, the difference in pressure will cause the backrest body to can be bent at the height of the void.

[0008] Furthermore, at least the left and right edges of the backrest body are difficult to elastically deform (i.e. Due to the formation of ribs (high rigidity), the backrest body deforms excessively. This prevents this from happening, ensuring the ability to elastically support the backrest load. This, combined with the fact that the backrest body bends backwards as described above, The backrest body can be tilted backwards to fit the person's back. It is.

[0009] The backrest load is elastically supported by the elastic restoring force of the backrest itself. Therefore, in addition to not requiring a separate spring body to support the backrest load, A simple structure in which a hollow space and a rib portion are provided in a backrest body formed in a shell shape. Therefore, it is extremely easy to manufacture and can significantly reduce manufacturing costs. It is.

0010

【Example】

Next, embodiments of the present invention will be described based on the drawings. The first embodiment is shown in FIGS. 1 to 6, and the reference numeral 1 in these figures indicates the leg A chair comprising a seat body 3 supported by a body 2 and a backrest body 4 erected behind the seat body 3 The seat body 3 and the backrest body 4 are made of hard synthetic resin as an example of an elastic body. It is formed in an integrally connected form.

[0011] The backrest body 4 is formed into a shell shape that is curved convexly toward the rear in plan view. In the backrest body 4, a portion between the left and right edges has a substantially symmetrical shape when viewed from the front. Three horizontally long perforated holes 5, 5, 5 extending in the vertical direction are bored at appropriate intervals above and below. , excluding the parts on the sides of the three spaces 5 of the outer periphery of the backrest body 4. All parts should be bent more backwards than other parts to prevent deformation. By forming the thick rib portion 6, the backrest body 4 can reduce the height of each void 5. It is configured so that it can be bent and deformed backwards at the position where it is located.

0012 In this case, it is sandwiched between vertically adjacent rib portions 6 of the left and right side edges of the backrest body 4. The wall thickness T3 of the portion 4a that is The portion 4 sandwiched between the rib portions 6 is formed to be smaller than the wall thickness T1 of the rib portion 6. a may be formed to have the same thickness as the wall thickness T1 of other parts of the backrest body 4. In addition, although the end portion 6a of the rib portion 6 is formed to be thicker, the entire rib portion 6 is approximately It goes without saying that they may be formed to have the same thickness dimension T2.

[0013] Behind the left and right sides of the backrest body 4, there is a vertically approximately intermediate portion of the backrest body 4. An auxiliary support 7 with a backward U-shaped cross section extending to the vicinity is provided, and the auxiliary support 7 A horizontal portion 7a formed at the lower end of the pillar 7 is attached to the lower surface of the seat support 8 to which the seat 3 is attached. A block is fixed to the support column 7 and protrudes backward from the rear surface of the backrest body 4 on the side surface of the support column 7. The racket part 9 is fixed with screws or the like. Further, an auxiliary tilting body 11 having a backward U-shaped cross section is provided at the upper end of the pillar 7. , the auxiliary tilting body is pivoted at its lower end with a pin 12 so as to be able to freely tilt backward. While a vertical longitudinal guide space 13 is bored in the upper part of the outer plate 11a at 11, The outer plate 1 of the auxiliary tilting body 11 is attached to the upper back surface of the backrest body 4. A guide part 14 is formed extending along the outer surface of the guide part 1a, and a front A locking portion 14 having a T-shaped flat cross section or the like fits and engages the guide cavity 13 in a vertically slidable manner. It forms a. The auxiliary support column 7 and the auxiliary tilting body 11 do not necessarily need to be provided.

[0014] Note that there is a support 15 such as an elastic body between the left and right sides of the seat 3 and the seat receiver 8. is inserted so that the seat body 3 can be bent and deformed in a downward convex shape when seated. . On the front surface of the backrest body 4 and the upper surface of the seat body 3, as shown in FIG. The cushion body 16 may be stretched.

[0015] In the above configuration, when a person sitting on the chair 1 leans against the backrest 4, the person The backrest load is reduced by the tendency of the upper body to concavely bend backwards. , acts to strongly press the upper part of the backrest body 4 and weakly press the lower part. Then, the backrest body 4 is created by drilling three spaces 5, 5, 5 above and below, and by forming the backrest body 4. Rib portions 6 are formed on the periphery of the backing body 4 except for the portions on both the left and right sides of each void 5. As shown in FIG. In other words, the backrest body 4 has a backward inclination angle that increases toward the top. As shown in FIG. The backrest load can be supported elastically by the elastic restoring force of the backrest body 4 itself. As a result, the backrest body 4 can be fitted to the back of the person to ensure a comfortable state. It can be done. Also, since the backrest body 4 bends and deforms in front of the auxiliary tilting body 11, the backrest body 4 also bends and deforms in front of the auxiliary tilting body 11. As the leaning body 4 bends and deforms, the upper end of the backrest body 4 tilts backward and moves downward. Therefore, the guide portion 14 of the backrest body 4 will not be affected by the deformation of the backrest body 4. Accordingly, the auxiliary tilting body 11 slides downward along the guide space 13.

[0016] The backrest load is elastically supported by the elastic restoring force of the backrest body 4 itself. There is no need to provide a separate spring body, and the backrest body 4 has a hollow space 5. It is a simple form in which the rib portion 6 is formed by molding the rib part 6, and it can be achieved by integrally molding synthetic resin. Because it is extremely easy to manufacture, the manufacturing cost of the backrest device can be significantly reduced. Ru.

[0017] In the above embodiment, the lower end of the backrest body 4 is integrally connected to the rear end of the seat body 3. However, the backrest body 4 was manufactured separately from the seat body 3, and the rear end of the seat support body 8, etc. Needless to say, it is also possible to fix it to . Furthermore, the rib portions 6 may be formed only on the left and right side edges of the backrest body 4.

[0018] 7 to 11 illustrate other cross-sectional shapes of the rib portion 6. The rib portion 6 shown in FIG. 7 has a circular cross section, and the rib portion 6 shown in FIG. 8 has a circular cross section. The rib portion 6 formed with two circular cross-sections is shown in FIG. 9 on the backrest body 4. The rib portion 6 is formed into a cylindrical shape by folding the side edge backward or forward, Moreover, what is shown in FIGS. 10 and 11 is one in which the rib portion 6 is provided to protrude backward. . As shown in FIG. one or both of them, so that the size gradually decreases from the top to the bottom of the backrest body 4. The stiffness (spring constant) of the rib portion 6 increases as it moves toward the upper part of the backrest body 4. By configuring the backrest body 4 to become smaller, the backrest body 4 bends closer to its upper part. It may be configured to be easily deformed.

[0019] The cavity 5 in the present invention is not limited to being formed in the shape of a punch hole, and for example, as shown in FIG. And as shown in Fig. 12, the backrest body 4 is recessed toward the rear (or forward). (the recessed portion is indicated by reference numeral 4b), thereby forming a groove-like recess 5 extending in the left-right direction. By drilling holes 5a at both left and right ends of this recess 5, the back can also be The sagging body 4 is formed so that it can be bent rearward while elastically deforming the concave portion 4b. You can do something like that.

[0020] Furthermore, as shown by the dashed line in FIG. Auxiliary ribs 17 having an appropriate cross-sectional shape extending along both end edges may be formed; This configuration prevents the backrest body 4 from being excessively deformed into a backward convex shape in plan view. It has the advantage of being able to stop. Note that the empty spaces are not limited to just one strip at one location, but are also provided at the same height of the backrest body. A plurality of them may be provided along the left-right direction. Furthermore, the backrest body is not limited to being made of hard synthetic resin. It may also be formed by processing gold.

[Brief explanation of drawings]

FIG. 1 is a side view of a first embodiment.

FIG. 2 is a front view of the first embodiment.

FIG. 3 is an enlarged sectional view taken along III-III in FIG. 1;

FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is an enlarged sectional view taken along the line V-V in FIG. 1;

FIG. 6 is an operational diagram of the first embodiment.

FIG. 7 is a sectional view showing another example of the rib portion.

FIG. 8 is a sectional view showing another example of the rib portion.

FIG. 9 is a sectional view showing another example of the rib portion.

FIG. 10 is a front view showing another embodiment.

FIG. 11 is a sectional view taken along line XI-XI in FIG. 10;

FIG. 12 is an enlarged sectional view taken along line XII-XII of FIG. 10;

[Brief explanation of symbols] 1 Chair 3 Sitting body 4 Backrest body 5 Blank space 6 Rib part 7 Auxiliary support 9 Bracket part 11 Auxiliary tilting body

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Hiroshi Iwabuchi 1-4-18 Imafukuhigashi, Joto-ku, Osaka Inside the company Itoki factory

Claims (1)

[Scope of utility model registration request] Claim 1: A backrest body formed in a shell shape from an elastic material such as a hard synthetic resin is erected at the rear of the seat body of the chair, and a portion of the backrest body inside the left and right side edges is provided with the backrest body. While the backrest body is provided with one space or a plurality of spaces spaced at appropriate intervals above and below so that the backrest body can be elastically bent and deformed toward the rear, at least the left and right sides of the periphery of the backrest body are provided with spaces inside the periphery. 1. A chair backrest device, characterized in that a rib portion is formed so as to bend backward and become less susceptible to deformation than that portion, and is formed to extend except for portions on both left and right sides of the void.