JP2001017262A - Seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an index value of 'softness' substantially constant in each part of a seat cushion. SOLUTION: A seat having a seat cushion (cushion section) 1 forming a seat section and a seat back (back section) 2 forming a backrest section for a person who takes seat is constituted such that, a person when sitting down on the seat, grasps a part where his/her bottom is placed is in a state of being divided into three parts, i.e., a hip support section 11C, a thigh support section 11B, and a front edge section 11A, and that the index values of 'softness' of respective sections become almost equal. Here the value of the index of 'softness' is generally defined as an inverted value of a spring constant K or an elasticity rate E representing general hardness or rigidity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat and, more particularly, to the hardness (softness) of a cushion portion of a seat when the person is seated on a seated portion (buttock) of the person. The present invention relates to a sheet which is set to be in an optimum state in consideration of a fleshed state and the like.

[0002]

2. Description of the Related Art In a conventional seat, particularly a vehicle seat, the hardness or softness of a cushion portion is set based on a mechanical spring constant or the like. It is. Therefore, the conventional seat generally has a substantially constant spring constant or hardness over the entire cushion portion.

[0003]

By the way, it is a person who sits on such a seat. The flesh state and the skeletal state of the human body, particularly from the buttocks to the thighs, which come into contact with the cushion portion of the seat when sitting, change. That is, it differs depending on the place. With respect to such a seat cushion (cushion portion) with which each part of the human comes in contact (sits), the hardness and the like are simply set based only on the mechanical spring constant from the viewpoint of sitting comfort and the like. It is hard to say that it always matches the sensation of the occupant. In consideration of such a point, the present applicant determines the state of hardness and the like in each part of the seat cushion as “softness” calculated from the amount of bending in each part when a person is seated and the pressure value at that time. Based on the index ", a method for evaluating the characteristics of the sheet has been devised, and a patent application has already been filed (Japanese Patent Application No. Hei 11-0535).
No. 22). Accordingly, an object of the present invention is to provide a seat in which the value of “softness” in each part of the seat cushion is set to be substantially constant based on the index value of “softness”. Subject).

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, regarding a seat including a seat cushion and a seat back, when a person sits on the seat, the seat cushion is calculated based on the amount of deflection at each part of the seat cushion forming the seat and the pressure value at that time. And the index value represented as "softness" is configured such that the front edge portion, the thigh support portion, and the buttocks support portion forming the seat cushion have substantially the same value in each cross section. I decided to take it.

[0005] By adopting such a configuration, the present invention has the following effects.
That is, in a state in which a person is seated on the seat, the hardness of each part of the seat cushion is set in a state in which a fleshed state or the like in the seated part (buttock) of the person is taken into consideration. The sheet characteristics are set in the matched state. For example, the characteristics of the seat at the front edge, the thigh support, and the buttocks support of the seat cushion are defined by an index of “softness”, and the values of “softness” at the respective cross-sections are substantially the same. Therefore, when seated on the seat, each part of the seat cushion can be deformed (displaced) in a state corresponding to the state of the buttocks of the seated person. Therefore, the seating posture of the seated person can be maintained in an optimum state, and thus, even when the seated person is seated for a long time, the seated person can be prevented from feeling tired.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. The feature is that the index value representing "softness" is represented as a compliance amount (Cp) or an elastic compliance amount (Cp '), which means ease of deformation or followability. That is, in the present invention, with respect to the seat according to claim 1, the index value represented as "softness" is represented by the amount of deflection in each part of the seat cushion and the pressure value at that time. A compliance amount (Cp) represented by a ratio of a pressure value or an elastic compliance amount (Cp ') represented by a ratio of a strain amount to a pressure value, and these index values are used for each part of the seat cushion. In the above, a configuration in which almost the same value is provided is adopted. By adopting such a configuration, in the apparatus of the present invention, the seated posture of the seated person can be maintained in a normal state, and for example, there is an inconvenience that the buttocks (buttocks) and the like are extremely lowered. Will not occur.

Next, the third aspect of the present invention will be described. This is also basically the same as the first or second aspect. The feature is that the compliance amount (Cp) or the elastic compliance amount (Cp) which is an index value indicating “softness” is used.
That is, the value of p ′) is specified within a predetermined range. That is, in the seat according to the present invention, in the seat according to claim 1 or 2, the index value of “softness” in each portion of the seat cushion is defined as a compliance amount (Cp: Cm cubed / g). 1/10
Within the range of 0 to 5/100, or 0.1 / 1 as the elastic compliance amount (Cp ′: square of Cm / g).
The configuration is set to be set within the range of 00 to 0.5 / 100. By adopting such a configuration, in the case of the present invention, the "softness" of the seat cushion portion is set more specifically, and the seated person maintains the seated posture in a more stable state. Will be able to

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Although related to the present embodiment, as shown in FIG. 1, the configuration includes a seat cushion (cushion portion) 1 forming a seating portion and a seatback (back portion) 2 forming a backrest portion of a seated person. It is based on that. In the one having such a basic configuration, the seat cushion (cushion portion) 1 is placed in a state where a person is seated on the seat, as shown in FIG.
1B and the front edge 11A supporting the front part of the thigh are grasped in a state of being divided into three parts, and the index value of "softness" in each part is set to be substantially the same value.

Here, the value of the index "softness" is expressed (defined) as a reciprocal value of a spring constant (K) or an elastic modulus (E) representing general hardness or rigidity. . That is, “softness” is defined as a compliance amount (Cp) or an elastic compliance amount (Cp ′), which means ease of deformation or followability. Specifically, it is defined as Cp = ΔL / p or Cp ′ = ε / p. Here, ΔL is the deformation amount (displacement amount) of each cross-sectional portion at the time of sitting, and P is the pressure value at that time. Ε is a dimensionless value expressed as ΔL / L, which is a distortion amount. Note that the value of L in these cases is the thickness of the cushion portion 1 before deformation of each cross section. As for the “softness” (index) represented in this manner, in the present embodiment, values as shown in Table 1 below are adopted.

[0010]

[Table 1]

The index value of the "softness" is not limited to such a constant value.
, Ie, the value of the compliance amount (Cp) is in the range of 1/100 to 5/100,
Alternatively, the value of the elastic compliance amount (Cp ′) is set to 0.
What is necessary is just to be in the range of 1/100 to 0.5 / 100. However, the unit of Cp is (Cm cubed) / g, and Cp ′
Is (Cm squared) / g.

In order to obtain such a value of “softness”, in the present embodiment, the seat cushion (cushion portion) 1 is, as shown in FIGS. The inner layer 112 and the lower layer 113 are composed of three layers, and the characteristics (hardness) of these three layers are adjusted to appropriate values. That is, the skin layer 111 forming the first layer is made of a laminated material of leather or a fabric material and a soft urethane material, and these are sewn so as not to increase the tensile rigidity. As the urethane material, urethane foam or the like is mainly used, and has a hardness of 15K and a density of 5K.
7, the one having a thickness of 10 mm is adopted.
Next, the inner layer 112 forming the second layer is made of, for example, a relatively hard urethane pad, and has a hardness of 20K, a density of 65, and a thickness of 100 to 120 mm. ing. Next, a coil spring is mainly used for the lower layer 113 forming the third layer. However, it is not necessarily limited to a coil spring as long as it exerts a predetermined repulsive force, and may be a solid elastic member made of a rubber material, a soft plastic material, or the like.

Next, the operation and the like of the embodiment having the above-described configuration will be described. That is, when a person sits on the seat, the hardness of each part of the seat cushion (cushion part) 1 is set in a state in which a fleshed state or the like in the person's seating part (buttock) is considered. Since the value (index value) of the "softness" is substantially the same in each part (11A, 11B, 11C), the posture of the occupant may be extremely inclined. Instead, you will be able to sit in the correct position. Also, since there is no place (part) where the value of "softness" becomes extremely large, the bottom of the so-called buttock, which means contact with the coil spring 113 or the like forming the third layer in FIG. The sticking phenomenon can be avoided. Therefore, it becomes possible to sit on the seat in a state that matches the sensitivity of human beings, and the seated person does not feel tired even when sitting for a long time.

[0014]

According to the present invention, with respect to a seat composed of a seat cushion and a seat back, when a person sits on the seat, the amount of deflection at each part of the seat cushion forming the seat and the amount of deflection at that time. The index value calculated based on the pressure value and represented as "softness" is substantially equal in each of the cross-sections of the front edge, the thigh support, and the buttocks support forming the seat cushion. In the state where a person is seated on the seat, the posture of the occupant does not extremely tilt,
You can now sit in the right position.
As a result, even when sitting for a long time, it is possible to prevent the seated person from feeling tired.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of the present invention.

FIG. 2 is a perspective view showing an overall configuration of a seat cushion (cushion portion) constituting a main part of the present invention.

FIG. 3 “Softness” at each cross section of the cushion portion.
It is a figure (graph) which shows the state of.

FIG. 4 is a cross-sectional view showing a deformed state of the cushion section when a person sits on the cushion section.

[Explanation of symbols]

 Reference Signs List 1 seat cushion (cushion part) 11A front edge part 11B thigh support part 11C hip support part 111 skin layer (first layer) 112 inner layer (second layer) 113 lower layer (third layer) 2 seat back (back part)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shunichi Doi 41-1, Nagakute-cho, Yokomichi, Nagakute-cho, Aichi-gun, Aichi F-term in Toyota Central Research Laboratory Co., Ltd. 3B087 DE10

Claims (3)

[Claims] In a seat comprising a seat cushion and a seat back, when a person sits on the seat, the amount of deflection at each part of the seat cushion forming the seat and the pressure value at that time are determined. The index value calculated and represented as softness is
A front edge portion, a thigh support portion, which forms the seat cushion,
And a sheet having substantially the same value in each of the cross-sectional portions of the buttocks support portion. 2. The seat according to claim 1, wherein the index value represented as softness is represented by the amount of deflection in each part of the seat cushion and the pressure value at that time, and the difference between the amount of deformation and the pressure value. A sheet comprising a compliance amount represented by a ratio or an elastic compliance amount represented by a ratio between a strain amount and a pressure value. 3. The seat according to claim 1, wherein the index value of the softness at each part of the seat cushion is a compliance amount (Cp: the cube of Cm / third power).
g) is in the range of 1/100 to 5/100 or the elastic compliance amount (Cp ′: square of Cm /
g) a sheet characterized by being set in the range of 0.1 / 100 to 0.5 / 100.