JPH0529651Y2 - - Google Patents

Description

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

[Conventional technology and issues to be solved]

Utility Model Publication No. 38-10427 refers to a chair for office or work use, in which the seat body and the backrest are integrally molded from an elastic board made of thermoplastic synthetic resin material. It is known in publications etc.

In this prior art, a pair of left and right support arms that support the back surface of the seat body are disposed longitudinally in the middle part of the seat body in the left and right direction, and the seat is mounted on a horizontal rod that connects the front ends of the pair of left and right support arms. While supporting the front end of the rear surface of the seat portion in the body, a pair of upwardly facing hemispherical left and right bearing portions is formed on the back surface of the upper and lower midway portions of the backrest portion, and the pair of left and right supporting arms are attached to the pair of upwardly facing hemispherical bearing portions. A convex hemispherical cushion protruding from the rear end is configured to support a downward load, and the left and right portions are provided in a tubular through hole protruding from the back side of the backrest near the bearing portion. A pair of support arms are inserted and supported.

Furthermore, among the downwardly convex curved curves of the pair of left and right support arms when viewed from the side, the curves contact the rear surface of the backrest near the bearing, gradually separate from each other below the bearing, and the curved curves facing downward in the side view of the pair of left and right support arms contact the rear surface of the backrest, gradually separate below the bearing, and the curved curves of the pair of left and right support arms contact the rear surface of the backrest, and gradually separate from the rear surface of the backrest (lower surface) of the seating portion. It is configured so that a gap is created between the back surface and the upper surface of the support arm.

Generally a plate-like member (shell-like member) with a downwardly convex curve
When a downward load is applied to a part that supports only the front and rear parts of the body, the members near the point of application of the load undergo elastic deformation so that the curvature becomes smaller. The degree of elastic deformation is extremely small because the member is restrained by the support points on the front and rear parts.

Therefore, in the seat body of the prior art which has a similar configuration, when the weight of the seated person is applied downward to the seating part, the elastic force of the seat body itself causes the seat body to move between the seat part and the back as a whole. The part connecting with the backrest should be elastically deformed so that the radius of curvature becomes smaller, in other words, the downward convex curve becomes smaller, but as mentioned above, the upper and lower middle parts of the backrest and the front end of the seat part Therefore, the elastic force of the curved elastic plate itself of the seat body cannot be used efficiently, and the seat body as a whole has a drawback that it is difficult to elastically deform and the cushion is hard.

The object of the present invention is to eliminate the above-mentioned conventional drawbacks and provide a seat body for a chair that has appropriate soft cushioning performance.

[Means to solve the problem]

Therefore, in the present invention, the seat body, which is approximately L-shaped in side view and consists of a seat portion and a backrest portion, is integrally curved with an elastic plate, and the left and right edges of the seat body are connected from the seat portion to the backrest portion. The support rods are supported by a pair of left and right support rods that are curved so as to substantially follow the back surface of the backrest. A hole is drilled inside the support rod to release the strain restraint.

[Functions and effects of the invention]

The seat body of the present invention is curved so that the seat portion and the backrest portion are integrated, and the seat body is made of an elastic plate having elasticity such as a synthetic resin plate or a metal plate.

In addition, since the seat body is supported by a pair of left and right support rods along the back surface from the seating part on both left and right edges of the seat to the backrest part, when a downward load is applied to the seating part, the support rods extend from the seating part to the backrest part. The left and right intermediate portions of the seating portion between the support rods undergo elastic deformation such that the cross section in the left and right direction is convexly curved downward.

In this invention, when a downward load on the seating part of this seat body causes the seating part to elastically deform so that the downward radius of curvature of the connecting part between the rear end of the seating part and the lower end of the backrest becomes smaller, the seating part and The above-mentioned elastic deformation is not so restricted because of the strain restraint release holes that are bored at positions inside the left and right pair of support rods at both left and right portions of the connecting portion with the lower end of the backrest.

In addition, in response to this elastic deformation of the seating part, the connection part with the lower end of the backrest in the left and right center parts of the seat body can also undergo elastic deformation such that it is pulled downward, and in this case, the elastic deformation is also restrained. I don't accept it.

Furthermore, since the amount of elastic deformation of both the seat portion and the backrest portion is proportional to the downward load and ultimately to the weight of the person, the amounts of elastic deformation of both the seat portion and the backrest portion will change depending on the weight of the person sitting on the seat.

Therefore, if the weight of the seated person is heavy, they will sit on a seat with high bending rigidity, and will not feel as if they are sitting on a chair that is too soft compared to their weight; This provides the same soft sensation as sitting on a seat with low bending rigidity.

In this way, it is possible to provide an optimal cushioning feeling according to the user's weight, thereby providing a chair with excellent ergonomics.

Further, the amount of elastic deformation of the seat portion and backrest portion can be arbitrarily set depending on the shape and size of the hole, and the bending rigidity of the entire seat body can also be adjusted as desired. In other words, the hardness or softness of the cushion of the seat can be set as desired.
Further, since there is no addition of any member other than a punch hole to the seat body itself, the structure of the chair is extremely simple.

〔Example〕

Next, to explain an example, the reference numeral 1 is a roughly L-shape when viewed from the side, which is integrally curved and made of an elastic plate made of thermoplastic synthetic resin such as styrene resin or thermosetting synthetic resin such as unsaturated polyester resin. The seat body is made up of a seat part 2 and a backrest part 3, and the seat part 2
The backrest portion 3 has a so-called three-dimensional curved surface that is curved in any of the X-axis direction, Y-axis direction, and Z-axis direction in FIG.
The curvature of the portion connected to the lower end is smaller than the curvature of other parts.

Symbols 4 and 4 are a pair of left and right pipe-shaped side views abbreviated as L.
The support rods 4, 4 are shaped like letters, and the support rods 4, 4 are fitted into the curled portions of the left and right side edges of the seat body 1, and are curved so as to extend from the seat portion 2 to the backrest portion 3 and approximately follow the back surface thereof. be configured to support it.

Reference numerals 5 and 5 indicate legs that support the pair of left and right support rods 4, 4.

In addition, the punch holes 6, 6 for releasing the strain restraint are located on both left and right sides of the connecting portion 7 between the seat portion 2 and the lower end of the backrest portion 3, and are located inside the support portions of the pair of left and right support rods 4, 4. It was drilled in the

Note that cushioning materials 8 and 9 such as foamed polyurethane resin are placed on the surfaces of the seat portion 2 and the backrest portion 3.

With this configuration, when a person's load is applied to the seating section 2, the seating section 2 curves in the left-right direction (midway in the X-axis direction) downward, as shown by the dashed line in FIG. A pair of support rods 4,
Due to the presence of the strain restraint releasing holes 6, 6, which are bored at the inner position of the seat part 2 and the backrest part 3,
Since there is little restraint on the elastic deformation of the connecting part 7 with the lower end in the X-axis direction, as the rear end of the seating part 2 is displaced downward (in the Y-axis direction), the connecting part 7 deforms downward as shown by the dashed line in FIG. It is elastically deformed so that the convex curvature becomes small, and at the same time, the lower end side left and right middle portions of the backrest 3 are elastically deformed so as to protrude forward (in the Z-axis direction) (see the dashed dot line in FIG. 4).

If the amount of elastic deformation of each part is large, the bending rigidity of the seat and backrest will also be large, and the cushion will feel stiff accordingly. You can think of it as proportional.

As a result, it is possible to provide the seat body 1 with bending rigidity corresponding to the weight of the seated person, and it is possible to provide the seated person with an optimal cushioning feeling.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of the chair, FIG. 2 is a cross-sectional view from the negative side of FIG. 1, FIG. FIG. 1 is a cross-sectional view taken from the side of FIG. 1, and FIG. 5 is a cross-sectional view taken from the side of FIG. 1... Seat body, 2... Seat part, 3... Backrest part,
4, 4... Support rod, 5, 5... Leg body, 6, 6...
Punch hole, 7...Connection part, 8, 9...Cushion material.

Claims (1)

[Scope of utility model registration request] A seat body, which is approximately L-shaped in side view and consists of a seat portion and a backrest portion, is integrally curved with an elastic plate, and the left and right edges of the seat body are extended from the seating portion to the backrest portion on the back surface thereof. It is configured to be supported by a pair of left and right support rods that are curved so as to substantially follow the same, and on both left and right sides of the connecting portion between the seating portion and the lower end of the backrest, there is a support rod that is located inside the pair of left and right support rods. A seat body of a chair characterized by having a punch hole for releasing distortion restraint at a position.