JPH0337010A - Seat - Google Patents

Abstract

PURPOSE:To alleviate fatigue during seating by embedding an elastic polyure thane core plate in which deformable assist air gaps are formed all over the surface thereof, in the rear surface of the seat part of a seat body formed of an urethane pad. CONSTITUTION:A seat 2 is composed of a seat body 6 formed of a urethane pad, and an elastic polyurethane core plate 7 embedded in the rear surface of the seat part of the sear body 6. Several deformable assist air gaps 8 which are vertical holes are formed all over the surface of the core plate 7. These deformable assist air gaps 8 are adapted to give an elasticity to the core plate 7 which is made of relatively hard elastic polyurethane, and eachof the vertical hole, that is, the deformable assist air gaps 8 may be a circular hole, a rectangu lar hole or a blind hole. lt is important that air gaps are formed to assist the deformation of the core plate 7 caused by an external force, thereby it is pos sible to reduce the transmission rate of vibration in the seat.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a seat suitable for sitting in a vibrating environment such as a vehicle such as an automobile, and particularly relates to a seat that imparts elasticity to the seat and improves the vibration transmission rate. This invention relates to a device that reduces fatigue on a seated person by reducing the

[Conventional technology]

Conventionally, in this type of seat, the lower layer is made of viscoelastic polyurethane, the upper layer is made of elastic polyurethane foam, and the upper and lower layers are integrally bonded on the entire surface, and the upper layer of elastic polyurethane foam has an energy absorption effect. It is known that the seat is designed to reduce fatigue caused by sitting on the seat, and to increase the durability of the seat by strong adhesion through the bonding of both polyurethanes in the lower layer of the sumo wrestler (see, for example, JP-A-62-183790).

[Problem to be solved by the invention]

In conventional seats, the lower layer of viscoelastic polyurethane has low elasticity, and the upper layer of elastic polyurethane foam has high elasticity, so the elasticity of the upper layer of elastic polyurethane foam reduces the load energy of the occupant. However, since the lower layer of viscoelastic polyurethane has low elasticity, when seated for a long time, the seated person may experience local stimulation of the lower layer of viscoelastic polyurethane on one side of the seat. However, in order to solve this problem, the lower layer of viscoelastic polyurethane is made relatively thin to give elasticity to the seat. However, if this is applied to a vibrating environment such as a vehicle such as an automobile, the lower layer of viscoelastic polyurethane is formed thinly, so the vibration transmission rate is high, and it will not last for a long time. When sitting, there is a problem in that the degree of fatigue of the seated person increases due to vibrations propagated to the underlying viscoelastic polyurethane layer.

The present invention solves the above-mentioned problems of the prior art.By making the core plate made of viscoelastic polyurethane relatively thick, the vibration transmission rate of the seat can be reduced, and the core plate can be assisted in deformation. It is an object of the present invention to provide a seat that can provide elasticity by forming voids throughout the entire seat, thereby reducing fatigue on the seated person.

[Means to solve the problem]

In order to achieve the above object, in the seat of the present invention, a core plate made of viscoelastic polyurethane in which deformation-assisting voids are formed throughout is embedded in the back surface of the seating portion of the seat body made of a urethane pad. It is something that exists.

[Function] The seat configured as described above has a core plate made of viscoelastic polyurethane embedded in the back surface of the seating area of the seat body made of urethane pad. By absorbing the load energy of the seated person through its elasticity, it is possible to reduce the immediate fatigue of the seated person, and at the same time, the durability of the seated section can be increased by a core plate made of viscoelastic polyurethane embedded in the back surface of the seated section. However, since the core plate made of viscoelastic polyurethane embedded in the back of the seating part has deformation-assisting voids formed throughout, the core plate is relatively deformable. The core plate made of viscoelastic polyurethane can also absorb the load energy of the person sitting on the seat due to its elasticity with the seat body made of urethane pad. Even when seated for a long period of time, the seated person can reduce fatigue without receiving local stimulation of the seating surface against the viscoelastic polyurethane of the core plate.

In addition, since the core plate made of viscoelastic polyurethane is given elasticity by the deformation-assisting voids formed throughout the core plate, it is possible to form the core plate relatively thick, and the vibration transmission rate is relatively low. By forming a thick core plate made of small viscoelastic polyurethane, the vibration transmission rate of the seat can be reduced, so even when used in a vibrating environment such as a vehicle such as a car, the seated person can easily move from the seat. Fatigue can be reduced without receiving vibration propagation.

〔Example〕

Embodiments will be described with reference to the drawings. What is shown in FIGS. 1 and 2 is the first embodiment.

Reference numeral 1 designates a support frame for the seat 2, and between the upper edges of the support frame 1, a spring member 4 is stretched in a flat shape by a plurality of connectors 3. Part 4
A seat sheet 2 is placed across the upper surface, and the seat sheet 2 is covered with a skin material 5, and the seat is constructed by fixing the peripheral edge of the skin material 5 to the support frame 1. ing.

The seat 2 is composed of a seat body 6 made of a urethane pad and a core plate 7 made of viscoelastic polyurethane embedded in the back surface of the seating area.The core plate 7 has many vertical holes. A deformation-assisting void 8 is formed throughout.

The deformation-assisting void 8 formed in the core plate 7 is formed on the core plate 7 made of relatively hard viscoelastic polyurethane.
Therefore, the large number of vertical holes serving as the deformation-assisting voids 8 may be round holes, square holes, or blind holes. If such voids are formed, the desired function can be achieved. Note that even if the deformation assisting void 8 is filled with a urethane pad, the same function can be achieved.

What is shown in FIGS. 3 and 4 is a second embodiment, in which the core plate 7 of the seat 2 made of viscoelastic polyurethane is erected over the entire thin core plate main body 7' and its lower side. It consists of a large number of columns 7"...

As a result, deformation-assisting voids 8 are formed throughout the core plate 7 between a large number of columns 7'''. Numeral 8 is for imparting elasticity to the core plate 7 made of relatively hard viscoelastic polyurethane as in the first embodiment. 7"... may be a cylinder or a prism, and may be the upper side of the core plate body 7' or the upper and lower core plate bodies 7', 7.
The core plate 7 may be provided upright between the core plates 7 and 7, and the desired function can be achieved as long as a gap is formed in the core plate 7 to assist deformation due to external force. Note that the same effect can be achieved even if the deformation assisting void 8 is filled with a urethane pad, and the elasticity can be increased by laminating thin core plates 7. I can do it. Further, in the case where the elasticity of the core plate 7 is increased, the spring member 4 in the first embodiment can be replaced with a pan 4' made of a metal plate.

FIG. 5 is a comparison graph of the vibration transmission rate of the seat sheet according to the vibration test. Compared to the vibration transmission rate of the seat sheet X made of urethane pad, the seat sheet 2 of the first example Y and the second example Z has more elasticity. Despite this, the vibration transmissibility was found to be quite low.

〔Effect of the invention〕

The present invention is constructed as described above, and a deformation-assisting void is formed throughout the core plate made of viscoelastic polyurethane and embedded in the back surface of the seating portion of the seat body. The core plate is given elasticity, and when sitting, the core plate can absorb the load energy of the seated person through the cooperation of its elasticity with the seat body. This allows the user to reduce fatigue without receiving local stimulation from the seating surface of the core plate, and the core plate is given elasticity by the deformation-assisting voids formed throughout the core plate. Because of this, the core plate can be made thicker and the vibration transmission rate of the seat can be reduced, so even when used in a vibrating environment such as a vehicle such as a car, the seated person can avoid the propagation of vibration from the seat. It is possible to reduce fatigue without suffering.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view showing a longitudinal section of a seat according to the first embodiment. Fig. 2 is a vertical sectional view taken along the line A-A in Fig. 1, Fig. 3 is a perspective view showing the seat according to the second embodiment in longitudinal section, and Fig. 4 is a longitudinal sectional view taken along the line BB in Fig. 3! The vertical cross-sectional view, FIG. 5, is a comparison graph of the vibration transmissibility of the seats. 2...Seat sheet 6...Seat body 7 made of urethane pad...Core plate 8 made of viscoelastic polyurethane...Deformation assisting void

Claims (1)

[Claims] A seat seat in which a core plate made of viscoelastic polyurethane is embedded in the back surface of a seating portion of a seat body made of a urethane pad, with deformation-assisting voids formed throughout.