JPH0537800Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to the structure of an elastic adjustment device for a seat body in an office or work chair.

[Problems that conventional technology and ideas try to solve]

2. Description of the Related Art In chairs for office or work use, it is well known that a seat body consisting of a seat portion and a backrest portion is integrally formed from an elastically deformable plate material such as a synthetic resin material.

In this case, in the conventional chair, the support members such as the legs of the chair are generally made of a rigid metal body (one that does not deform under load), and the left and right edges of the seat body are supported by the support members. Since it is fixed, the seat body is not easily deformed elastically depending on the load of the person sitting on the chair, and only chairs with so-called hard cushions can be provided.

In order to solve this problem, in the prior art publication No. 2-22154, which was previously proposed by the present applicant, the backrest of the chair is formed of an elastic plate, and the backrest is A reinforcing rib body having a vertically elongated bulge that can be freely curved in the distance direction with respect to the back surface of the backrest is provided, and at least one end of the left and right side ends of the reinforcing rib body is arranged in the left-right direction of the backrest part. It has been disclosed that the reinforcing rib body is mounted so as to be slidable on the backrest part, and that an interlocking means is provided on the back side of the backrest part to drive the bulging part of the reinforcing rib body in the distance direction with respect to the backrest part backside.

However, with this configuration, since the reinforcing rib body cannot be attached to any part other than the backrest, there is a drawback that the cushioning properties of the seat part cannot be adjusted.In addition, the structure of the interlocking means that adjusts the degree of elastic deformation of the bulging part of the reinforcing rib body The problem was that it was also complicated.

The present invention aims to solve this conventional technical problem and provide a chair that can provide substantially constant cushioning performance regardless of the weight of the person sitting on the chair.

[Means to solve the problem]

In order to achieve this purpose, the invention is to arrange a seat body consisting of a seat part and a backrest part on the surface side of an inelastic support body of a chair so that the seat body can be moved near and far at an appropriate distance. A plurality of rib portions are formed of an elastic plate that can be elastically deformed under a human load, and protrude toward the surface of the support body at least at the front or rear portion of the seat portion of the seat body. are formed at appropriate intervals in the left-right direction of the chair, and cutout spaces of appropriate left-right length are formed between the plurality of rib portions, and each of the rib portions is integrally formed from the plate of the seat body. A pair of front and rear protrusions on the left and right longitudinal sides are formed in a substantially V-shape in side view so that they are connected at their tips. Supporting means is provided to restrict and support the pair of front and rear protrusions in each rib portion so that the distance between the front and rear pairs of protrusions narrows as the protrusion ends approach the surface of the support body.

[Functions and effects of the invention]

In this invention, when a human load is applied to the seat, the seat made of an elastic plate such as a synthetic resin plate or thin metal plate approaches the surface of the inelastic support that does not undergo elastic deformation. At this time, the rib portions protruding from the seat body approach the support means of the support body, and accordingly, the distance between the front and rear pairs of protrusion pieces of each rib portion is regulated to be narrowed by the support means. Therefore, the bending resistance of these rib portions and the connecting portions of the plate portion of the seat body increases.

This action allows the rigidity of the seat body to be changed through elastic deformation of the rib portion. That is, when a heavy (light) person sits on the seat, the bending rigidity of the seat as a whole increases (decreases), and the cushion of the seat also becomes harder (softer).

As described above, according to the present invention, it is possible to provide a chair with an extremely simple structure that can automatically adjust the cushioning performance of the seat body to be optimal depending on the weight of the person sitting on the chair. It is.

〔Example〕

Next, to explain the embodiment, FIGS. 1 to 8 show the first embodiment, and the office chair 1 is shown in FIG.
A support stand 3 is fixed to the upper end of a leg support 2 having a caster at the lower end, and the support stand 3 is made of an inelastic body (which is not easily deformed elastically by the load of a person) and is approximately L-shaped in side view. A shell-shaped support 4 made of material) is placed and fixed.

Reference numeral 5 indicates the main seat portion 6 where the buttocks of the person sitting are located.
, a front seat part 7 located in front of it, and a backrest part 8
The seat body 5 is made of an elastic body such as a thin plate of synthetic resin or composite reinforced plastic of synthetic resin and glass fiber, and has a shape of approximately L when viewed from the side. It is integrally formed into a letter shape, and cushion materials 9 and 10 such as foamed polyurethane resin are stretched on the surface side of the seat body 5.

Reference numeral 11 indicates a cushion material such as foamed polyurethane resin disposed on the lower surface of the main seat portion 6, reference numeral 12 indicates a support plate for receiving the cushion material 11, and reference numeral 13 indicates the upper surface of the support plate 12 and the bottom plate portion 4a of the support body 4. A plurality of coil springs are inserted between the main seat portion 6 and the support body 4. These coil springs bias the main seat portion 6 in a direction away from the support body 4.

Reference numeral 14 denotes a support portion protruding forward from the upper part of the vertical plate portion 4b of the support body 4, and the rear surface of the abutment member 15 having a generally dogleg-shaped side cross section with a midway portion protruding backward from the back surface of the backrest portion 8. is slidably abutted and supported by the support portion 14.

Reference numeral 17 denotes a fixture with a flange 17b that allows the backrest part 8 to move freely toward and away from the vertical plate part 4b of the support body 4 and prevent it from moving away from the vertical plate part 4b. is slidably inserted into a vertically elongated hole 16 bored in the vertical plate 4b.

As shown in FIGS. 1 and 2, a plurality of rib portions 18 are provided at the front and rear portions of the seat body 5 so as to protrude toward the surface of the support body. The rib portion 18 is formed integrally with the rear end of the main seat portion 6 and the lower end of the backrest portion 8 in a substantially V-shape when viewed from the side. In order to form the ribs at appropriate intervals in the left and right direction of the chair, the ribs are formed with an appropriate left and right length (
A cutout space 19 of 2) is formed.

That is, each of the rib portions 18 has an approximately V shape when viewed from the side so that a pair of left and right longitudinal (length 1) downwardly projecting pieces 18a and 18b are connected at the lower end. On the other hand, the protruding ends c of each rib part 18 penetrate to the back side of the support body 4 at four locations facing the protruding ends 18c of each rib part 18, and the front and rear pairs of Projecting piece 18a,
A support means 20 in the form of a horizontally elongated slot is provided to which the outer surface (front and rear surfaces) of the support member 18b can abut.

With this configuration, when a person sits on the main seat part 6, the main seat part 6 approaches the bottom plate part 4a of the support body 4 against the biasing force of the cushion material and the coil spring 13 in approximately proportion to the downward load. It sinks in like that. At this time,
The protruding ends 18c of the plurality of rib portions 18 also protrude downward from the supporting means 20.
The front and rear width dimension H1 of the hole is constant, and on the other hand, the pair of front and rear downwardly protruding pieces 18 of each rib portion 18 is
Since a and 18b are designed to widen in the front and back as they move upward, the front and back distances 3 and 4 between the upper parts of the pair of front and rear protruding pieces 18a and 18b are reduced in approximately proportion to the amount of depression of the rib portion 18. regulated (see Figure 8). Therefore, the front end of the main seat part 6 and the front seat part 7
The front seat part 7 is drawn toward the front end side of the main seat part 6 at 18 rib parts that are connected to the rear end.
The degree of curvature of the joint bending portion between each rib portion 18 and the plate portion of the seat body 5 becomes tight, and at the 18 rib portions that are the joint portion between the rear end of the main seat portion 6 and the lower end of the backrest portion 8, the backrest portion Similarly, the degree of curvature of the joint bending portion between each rib portion 18 and the plate portion of the seat body 5 becomes tight so that the lower end of the rib portion 8 approaches the main seat portion 6.

In this way, when the degree of curvature of the joint bending portion between each rib portion 18 and the plate portion of the seat body 5 becomes tighter, as the human load increases, the seat body 5
The resistance force for elastic deformation of (main seat part 6, front seat part 7, and backrest part 8) increases, making it difficult to bend. In other words, if the weight of the person sitting on the chair is large,
On the other hand, when a person with a light weight sits on the chair, the backrest 8 and the front seat 7 bend to approximately the same degree, making it possible to create a chair that provides approximately the same cushioning performance regardless of the person's weight. It can be provided.

Note that the direction in which the main seat portion 6 is elastically deformed due to the weight of the person is determined by the orthogonal coordinates (indicated by X, Y, and Z) in FIG.
, the central portion of the main seat portion 6 is curved and deformed in a convex shape downward (in the Z-axis direction) to a greater degree than the left and right edges of the main seat portion 6 along the left-right direction (X-axis direction) of the chair, and It is conceivable that the front and rear midpoints may be curved and deformed in a convex manner downward (in the Z-axis direction) than the front and rear edges (see the two-dot chain line in Fig. 8).
Even if there is some elastic deformation of the main seat part 6,
The change in the degree of curvature of the connecting portions of the respective rib portions 18 described above is greater.

As shown by the dashed line in FIG. 5, downward reinforcing ribs 21, 21 may be provided at the middle of the left and right sides of the main seat 6 to prevent elastic bending deformation of the wide surface of the main seat 6 due to a downward load on the main seat 6.

When the weight of the person is released from the seat body 5, the seat body 5 can be moved in the direction in which the rib portion 18 comes out of the 20 supporting means of the support body 4 due to the restoring force of the coil spring 13 and the like.

9 to 11 show other embodiments of the support means 20, in which a front seat part 7, a main seat part 6, a lower back part 22, and an upper back part 23 are arranged on the front side of the support body 4 through glass. A seat body 5 integrally formed of an elastic plate material such as reinforced plastic is provided, and a front seat part 7 is provided.
between the main seat part 6 and the main seat part 6, and the main seat part 6 and the lower backrest part 22.
Between the lower backrest part 22 and the upper backrest part 23, a plurality of rib parts 18 protruding toward the surface of the support body are provided between the lower backrest part 22 and the upper backrest part 23, and a side surface is provided at the connecting point of each part. It is integrally formed into a V-shape when viewed from the outside,
Since the rib portions 18 are formed at appropriate intervals in the left-right direction of the chair, it is also the same as in the previous embodiment that cutout spaces 19 having an appropriate left-right length are formed between the plurality of rib portions.

A supporting means 20 consisting of a left and right longitudinal box body 24 is fixed to the surface of the support body 4 in correspondence with each of the 18 rib portions, and the front and rear pairs of the box body 24 (the upper and lower pairs for the backrest portion) are fixed to the surface of the support body 4. ) side plates 25, 26
A pair of protruding pieces 18 on the rib portion 18 between
A gap 27 is formed so that the plates 18a and 18b fit into each other, and protruding pieces 1 are provided on the edges of the side plates 25 and 26.
Sliding parts 28, 28 are provided in which the outer surfaces of the ribs 8a, 18b are slidably abutted, while sliding parts 28, 28 are provided in the box body 24, which are in contact with the protruding end 18c of each rib part 18 and are attached in the direction of pushing out the protruding end 18c. A biasing means 29 made of rubber or the like is provided inside.

According to this configuration, the main seat portion 6 of the seat body 5 or
When a person's weight is applied to the lower backrest portion 22, the rib portions 18 at each joint portion approach the surface side of the support body 4 so as to enter into the box body 24, and at this time, the pair of protrusions of each rib portion 18 The pieces 18a and 18b are regulated by the sliding parts 28 and 28, and are displaced so that the distance between the two protruding pieces on the connecting side (base side) becomes narrower, and the pieces 18a and 18b are displaced between the front seat part 7 and the main seat part 6, and the main seat part 6. between the lower backrest portion 22 and the lower backrest portion 22, and between the lower backrest portion 22 and the upper backrest portion 2.
3, the degree of curvature of the connecting portion between the plate portion of the seat body 5 and each rib portion 18 becomes tighter,
Front seat part 7 that resists the human weight and elastically deforms and leans forward.
The tilting resistance of the upper backrest portion 23 that tilts backward is increased, and as in the embodiment described above, it is possible to provide a chair that provides substantially the same cushioning performance regardless of the person's weight.

[Brief explanation of the drawing]

1 to 8 show the first embodiment, FIG. 1 is a perspective view of the main parts of the chair, and FIG. 2 is a -
3 is a sectional view of FIG. 2, FIG. 4 is a sectional view of FIG. 2, FIG. 5 is a sectional view of FIG. 2, and FIG. 6 is a sectional view of FIG. Figure -
7 is a cross-sectional view of FIG. 2,
8 is an explanatory view of the operation, FIG. 9 is a schematic perspective view of the chair of the second embodiment, FIG. 10 is a schematic side view, and FIG. 11 is an enlarged side sectional view of the main part of the support means. 1...Chair, 2...Leg support, 3...Support stand, 4
... Support body, 5 ... Seat body, 6 ... Main seat part, 7 ...
Front seat part, 8... Backrest part, 9, 10, 11...
Cushion material, 13... Coil spring, 18... Rib portion, 18a, 18b... Projecting piece, 18c... Projecting end, 19... Notch space location, 20... Supporting means, 21... Reinforcing rib, 22 ...lower backrest,
23...Upper back portion, 24...Box body, 25,2
6... Side plate, 27... Between, 28, 28... Sliding part, 29... Biasing means.

Claims (1)

[Scope of utility model registration request] A seat body consisting of a seat part and a backrest part is disposed on the surface side of an inelastic support body of the chair so as to be movable near and far with an appropriate distance between them, and the seat body can be elastically deformed by a human load. The seat body is made of an elastic plate, and at least at the front or rear portion of the seat body, a plurality of rib portions protruding toward the surface of the support body are provided at appropriate intervals in the left-right direction of the chair. A cutout space having an appropriate left and right length is formed between the plurality of rib portions, and each rib portion is formed by a pair of front and rear protruding pieces in the left and right longitudinal directions extending integrally from the plate of the seat body. are formed in a substantially V-shape when viewed from the side so that the ribs are connected at the tip, and the protruding end of each rib portion approaches the surface of the support due to the load of a person acting on the seat. 1. A device for adjusting the elasticity of a seat body in a chair, characterized in that a support means is provided to restrict and support the pair of front and rear protruding pieces in each rib portion so as to narrow the distance between the front and rear pairs of protruding pieces.