JP2701115B2 - Seat cushion - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat cushion for a vehicle seat.

[0002]

2. Description of the Related Art A seat cushion is generally constructed by extending a spring member such as an S-shaped spring between both side portions of a seat frame, and directly placing a cushion pad material on the spring member. However, in this case, it is necessary to make the cushion pad material thicker so that the presence of the spring member is not transmitted to the occupant as a tactile sensation. There is a problem that the stroke is insufficient and the player wins.

According to Japanese Utility Model Application Laid-Open No. 2-76938, a cloth spring is provided in which a support plate is disposed below a hip supporting portion of a cushion pad material, and the plate is stretched between a side edge portion and a seat frame. There is also known a seat cushion which is elastically connected to a seat frame by a spring member or the like. According to this, there is an advantage that the cushion pad material can be made thinner than the above. However, in this case, in order to secure a cushion stroke, it is necessary to widen the tension gap between the support plate and the seat frame between the spring members, which increases the size of the seat frame. There is a problem that it is necessary to attach a spring member to each of the parts, and it takes time to assemble.

[0004]

SUMMARY OF THE INVENTION In view of the above points, the present invention makes it possible to reduce the thickness of a cushion pad material by using a support plate and to provide a sufficient cushion stroke without increasing the size of a seat frame. It is an object of the present invention to provide a seat cushion with good assemblability that can be secured in a vehicle.

[0005]

In order to achieve the above object,
The present invention provides a seat cushion in which a support plate is arranged below a hip support portion of a cushion pad material, wherein a spring member stretched between both side portions of a seat frame is arranged below a support plate arrangement portion, A support plate is supported by the spring member so as to allow the spring member to slide with respect to the support plate as the spring member expands and contracts.

[0006]

Since the sliding of the spring member with respect to the support plate is allowed, the spring member can extend and contract without being hindered by the support plate over the entire length extending over both sides of the seat frame. Even if the gap between the frame and the support plate is narrowed,
The cushion stroke can be sufficiently secured by the extension over the entire length of the spring member.

Although a cloth spring can be used as the spring member, an S-shaped spring is suitable for improving the cushioning property. In this case, a gap exists between the curved pitches of the S-shaped spring on the lower surface of the support plate. If the S-shaped spring is extended to some extent, it interferes with the projection when the S-shaped spring is extended to some extent, and further expansion of the S-shaped spring on the lower surface of the support plate is regulated, and the spring constant increases. As a result, excessive sinking is suppressed, which is advantageous.

When a spring member is arranged below the thigh support portion of the cushion pad material to support the thigh support portion, the spring member is set to have a smaller spring constant than the spring member to prevent the foot from moving. It is desirable not to do so.

[0009]

FIG. 1 shows a seat cushion of a vehicle seat. A cushion pad material 3 is attached to a seat frame 2 supported on a seat rail 1 so as to be able to move back and forth from above. .

The hip support portion 3 of the cushion pad material 3
a support plate 4 made of a synthetic resin is disposed below the support plate 4a.
As shown in FIG. 1, spring members 5 composed of S-shaped springs stretched between left and right sides of the seat frame 2 are disposed in a pair of front and rear,
The support plate 4 is supported by both spring members 5 and 5.

The support plate 4 is formed with a pair of front and rear recesses 4a which are recessed upward so as to receive the respective spring members 5, and the support plate 4 is attached to each spring member 5 at each recess 4a. It is seated to prevent the support plate 4 from being displaced in the front-rear direction, and furthermore, the central portion of each spring member 5 is fixed to the support plate 4 by welding or the like so that the support plate 4 is not displaced in the lateral direction. did.

Further, the depression 4 of the support plate 4
As shown in FIG. 4, a large number of protrusions 4b swelling downward so as to be inserted with a gap between the S-shaped curved pitches of the spring member 5 are formed in a. The sliding of the spring member 5 with respect to the support plate 4 accompanying the extension of the spring member 5 within the range of the gap is allowed. Thus,
The spring member 5 can expand and contract without being hindered by the support plate 4 over the entire length of the seat frame 2 on both sides, and even if the gap between the support plate 4 and the seat frame 2 is narrowed, the spring member 5 The required cushion stroke can be secured by the extension over the entire length of
When the predetermined stroke has subsided, the spring member 5
b, the further extension of the spring member 5 on the lower surface of the support plate 4 is restricted, and the support plate 4
The spring member 5 extends only between the seat member 2 and the seat frame 2, and as a result, the effective length of the spring member 5 decreases, the spring constant increases, and excessive sinking of the hip support portion 3 a is suppressed. .

The spring member 5 has a support plate 4
In order to reduce the sliding resistance and prevent the generation of noise, it is desirable to apply a slippery coating such as nylon over the entire length. Similarly, it is desirable that the support plate 4 be made of a material having sufficient strength and self-lubricating property.

Below the thigh support portion 3b at the front of the cushion pad material 3, a second spring member 6 stretched between the left and right sides of the seat frame 2 is provided. To support the thigh support. The spring member 6 has a smaller spring constant than the spring member 5,
For example, a deformed S-shaped spring bent in a triangular wave shape is used, and the thigh support portion 3b is easily bent according to the movement of the foot.

[0015]

As is apparent from the above description, according to the first aspect of the present invention, the cushion pad material can be made thinner by using the support plate, and even if the gap between the support plate and the seat frame is narrow, the cushioning member can be used. A sufficient stroke can be ensured, and the size of the seat frame can be reduced. Further, unlike the related art, there is no need to attach a spring member to each side edge of the support plate, which facilitates assembly.

According to the second aspect of the present invention, the spring constant of the spring member can be changed with the sinking of the hip support portion to prevent excessive sinking. Further, according to the third aspect of the present invention, The thigh support portion easily bends in accordance with the movement of the foot, does not hinder the movement of the foot, and improves the sitting feeling.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1;

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a bottom view of a support plate showing a relationship between a spring member and a protrusion.

[Explanation of symbols]

 2 Seat frame 3 Cushion pad material 3a Hip support portion 3b Thigh support portion 4 Support plate 4b Projection 5 Spring member 6 Second spring member

Claims (3)

(57) [Claims] 1. A seat cushion having a support plate disposed below a hip support portion of a cushion pad material, wherein a spring member stretched between both side portions of a seat frame is disposed below a support plate disposed portion. A seat cushion wherein a support plate is supported by the spring member so as to allow the spring member to slide with respect to the support plate as the spring member expands and contracts. 2. The apparatus according to claim 1, wherein the spring member is formed of an S-shaped spring, and a projection is formed on a lower surface of the support plate to be inserted with a gap between the curved pitches of the S-shaped spring. The seat cushion according to claim 1. 3. The thigh support portion of the cushion pad material is supported by a second spring member disposed below the thigh support member and having a smaller spring constant than the spring member. Seat cushion.