JPH08299098A - Supporting device for cushion pad of vehicle seat - Google Patents

Abstract

PURPOSE: To provide a supporting device for the cushion pad of a vehicle seat closely fitting the cushion pad to a seat face for comfortable using feeling even when the thin cushion pad is used. CONSTITUTION: A plane spring material 2 is arranged and held at the opening section 3 of a cushion frame 1 to form this supporting device for the cushion pad of a vehicle seat back. Multiple spring steel fine wires 4 are stretched in an angular frame material 21 to form the plane spring material 2, and the plane spring material 2 is elastically supported on the cushion frame 1 via a front torsion bar 5 and a rear torsion bar 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion pad supporting device in a vehicle seat which can be fitted to a seating surface to obtain a comfortable feeling even if a thin cushion pad is used. .

[0002]

2. Description of the Related Art In a cushion pad support device for a vehicle seat in which a surface spring material is arranged in an opening of a cushion frame and supported by the cushion frame, the surface spring material is used to compensate for insufficient elasticity of the cushion pad. The one that is elastically supported by the cushion frame with the tension spring is the actual open flat 2-3153.
It has been conventionally known as seen in Japanese Patent Publication No. 1 and Japanese Utility Model Publication No. 62-42453.

However, in the conventional cushion pad support device of this type, the surface spring material is elastically supported on the cushion frame by a large number of tension springs on both sides thereof, and the surface spring material comprises a plurality of spring steels. Since the wire is stretched between the rods on both sides of the rectangular frame material, it is difficult to secure a sufficient riding comfort without the seating surface fitting perfectly to the hip shape, and in particular,
It was not possible to obtain a comfortable riding comfort with respect to dynamic sitting comfort, that is, fluctuations in load caused by running vibration of the vehicle and irregular movement of the center of gravity of the human body. Moreover, when seated, since the uniform load is not applied to all the spring steel wires stretched in the left-right direction between the rods on both sides of the rectangular frame material, that is, inside the rectangular frame material, the surface pressure becomes high, and therefore good cushioning performance In order to obtain it, a thick cushion pad had to be used. Further, there is a problem that a large number of tension springs are required to elastically support the surface spring material on the cushion frame, resulting in high cost.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by elastically supporting a surface spring material on a cushion frame by a torsion bar, thereby lowering the cost and at the same time as a seating surface. Fits snugly to the buttocks, and evenly generates surface pressure on the seat surface, which is stable against load fluctuations due to vehicle vibrations and irregular movements, and movement of the center of gravity, providing a static sitting comfort. There is no problem in terms of surface, and it is also possible to provide a cushion pad support device for a vehicle seat that has good dynamic sitting comfort and has a comfortable feeling even when a thin cushion pad is used. It was completed for the purpose.

[0005]

A support device for a cushion pad in a vehicle seat according to the present invention, which has been made to solve the above-mentioned problems, has a surface spring member arranged at an opening of a cushion frame. In a device for supporting a cushion pad in a vehicle seat supported by a flat spring material, a plurality of spring steel thin wires are stretched inside a rectangular frame material having both required rigidity and elasticity. The cushion frame is elastically supported through a front torsion bar and a rear torsion bar.

[0006]

When the cushion pad supporting device for such a vehicle seat is used in a state in which the cushion frame is mounted on the vehicle body and the cushion pad is mounted and supported by the surface spring material, the cushion pad is deficient in elasticity. Although the material compensates for the traveling vibrations in the same way as the conventional cushion pad supporting device in this type of vehicle seat, the surface spring material is a rectangular frame material having both required rigidity and elasticity and a spring steel thin wire. In addition, the surface spring material is attached to the cushion frame by elastically supporting the front rod part and the rear rod part of the rectangular frame material to the cushion frame via the front torsion bar and the rear torsion bar, respectively. Since it is assumed that the cushion pad is seated, the load is applied to the entire rectangular frame material and all spring steel thin Since the contact pressure is evenly applied to the rear frame and the elastic force generated by the torsional deformation of the front torsion bar and the rear torsion bar causes the rear rod of the rectangular frame member to respond to the load on the seating surface. The portion flexes in a bow shape toward the front side and fits snugly in the hip shape, and at this time, an excellent cushioning effect is exhibited by the entire rectangular frame material having required elasticity and the elasticity of all spring steel wires.

[0007]

The present invention will now be described in detail with reference to the illustrated embodiments. In the figure, reference numeral 1 is a shallow bucket-shaped cushion frame, and 2 is a surface spring material which is disposed inside the opening 3 at the upper end of the cushion frame 1 and elastically supported by the cushion frame 1. This surface spring material 2
Is a front rod portion 22, a rear rod portion 23, and both side rod portions 24, which are made of a hard steel wire having a circular cross section selected in a diameter range of 2 mm to 8 mm or other thick wire material having required rigidity and elasticity, 24
The front rod portion 22 and the rear rod portion 23 of the rectangular frame member 21 consisting of
A plurality of spring steel thin wires 4 arranged in parallel in the front-rear direction at a distance of preferably 50 to 60 mm are stretched between the spring steel thin wires 4, and the spring steel thin wires 4 are kept at a constant interval. In addition,
The rectangular frame member 21 may be formed by bending one thick wire member into a rectangular frame shape, but the front rod portion 22, the rear rod portion 23, and the side rod portion 24 may have different wire diameters. In the above, the rectangular frame rod 21 is made of a hard steel wire having a circular cross section, but the material of the rectangular frame material 21 such as a flat steel wire or a bent pipe having a rectangular cross section may be any material having required rigidity and elasticity. Good.

The surface spring member 2 is arranged in the opening 3 at the upper end of the cushion frame 1 so that the front rod portion 22 and the rear rod portion 23 of the rectangular frame member 21 are connected to the front torsion bar 5 and the rear torsion bar. The front torsion bar 5 that is elastically supported by the cushion frame 1 via 6 and is connected to the front rod portion 22 has a substantially U shape, and its end is cut and raised at the front edge of the opening of the cushion frame 1. The front portion 22 is rotatably connected to the front rod 22 by a connecting member 7 such as a clip, which is fixed by a caulking claw or the like. On the other hand, the rear rod 23
The rear torsion bar 6 connected to is also U-shaped,
The end portion is fixed to the opening side edge of the cushion frame 1 by a caulking claw or the like, and the center portion is rotatably connected to the front rod portion 23 by a connecting member 7 such as a clip. As will be described later, the portion is formed with a U-shaped bent portion 6a that is deformed so as to bend the rear rod portion 23 to the front side in an arch shape when a load is applied.

[0009] With the above-mentioned structure, the cushion frame 1 is attached to the vehicle body, the cushion pad is mounted and supported by the surface spring material 2, and the cushion pad is covered with the seat cover. Since the spring member 2 is formed by stretching a plurality of spring steel thin wires 4 between the front rod portion 22 and the rear rod portion 23 of the rectangular frame member 21, the occupant's buttocks of all the spring steel thin wires 4 when seated. The load is applied to all the spring steel thin wires 4 while being supported at the rear position, and the load is distributed to the plurality of spring steel thin wires 4 and the force transmitted to each spring steel thin wire 4 is transmitted to the front rod portion 22. It is transmitted to the rear rod portion 23. The force transmitted to the front rod portion 22 and the rear rod portion 23 is the front rod portion 22 of the rectangular frame member 21 as described above.
Since the rear rod 23 is elastically supported by the front torsion bar 5 and the rear torsion bar 6, the surface pressure is equalized and applied to the surface spring material 2, and the elasticity of the spring steel thin wire 4 is Therefore, the elasticity of the rectangular frame member 21 itself and the elastic force of the front torsion bar 5 and the rear torsion bar 6 cushion the shock absorber. Therefore, even if the cushion pad mounted on the surface spring member 2 is made extremely thin. There is no feeling of bottoming up and a comfortable ride can be obtained.

In particular, as shown in FIGS. 2 and 3, the rear torsion bar 6 connected to the rear rod portion 23 has a central side L1 and subsequent sides L2, L3, and L4 which are U-shaped bent portions. When 6a is formed, when the seat is seated and a load is applied, the intersection P of the sides L1 and L2 moves downward, and the intersection Q of the sides L2 and L3 also moves downward. At this time, since the side L2 rotates inward about the side L3 as an axis, the intersection point P moves inward, and as a result, the side L1 is entirely bent toward the front side in an arcuate shape and fits snugly due to the hip shape. Furthermore, as shown in FIG. 4, when the connecting portion of the front torsion bar 5 is pulled rearward as the load increases, the distance between the connecting portion of the rear torsion bar 6 and the connecting portion of the rear torsion bar 6 gradually decreases due to the difference in the loci. Accordingly, the curvature of the side rod portion 24 of the rectangular frame member 21 is increased by that much, and the front rod portion 22 is further increased in resilience, so that a sheet having a better spring feeling can be obtained.

Further, the rectangular frame member 2 is used as the surface spring member 2.
When a plurality of spring steel thin wires 4 stretched in the front-back direction in 1 are used, all spring steel thin wires 4 are stretched in comparison with the case where the spring steel thin wires are stretched in the left-right direction between both rods. Since the load is easily distributed, the surface pressure is more equalized, and therefore,
Even if the cushion pad mounted on the surface spring material 2 is thinned, a more sufficient cushioning effect can be obtained. In addition, the surface spring member 2 elastically supports the front rod portion 22 and the rear rod portion 23 of the rectangular frame member 21 to the cushion frame 1 via the front torsion bar 5 and the rear torsion bar 6, respectively. The seat surface changes less with respect to dynamic fluctuations during driving, so you can get a comfortable ride and, in addition, you can lower the cost of parts compared to the conventional support by tension springs and the number of mounting steps. Can be simplified and has great advantages in cost reduction, and it is possible to promote weight reduction.

[0012]

As is apparent from the above description, the present invention makes it possible to reduce the cost by elastically supporting the surface spring material on the cushion frame by the front torsion bar and the rear torsion bar, and at the same time, the seating surface It fits snugly to the hip shape, and evenly generates surface pressure on the seat surface, which is stable against load fluctuations and movement of the center of gravity due to running vibration and irregular movement of the vehicle, and a static seating surface. There are various advantages such as the fact that there is no problem with the above, the dynamic sitting comfort is also good, and the feeling of use is improved even when a thin cushion pad is used. Therefore, the present invention eliminates the conventional problems, and the support by the front and rear torsion bars has an advantage in cost reduction as compared with the conventional support by many tension springs, which contributes to the development of the industry. The place to do is extremely large.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a rear torsion bar according to an embodiment of the present invention.

FIG. 3 is an enlarged plan view showing a rear torsion bar according to an embodiment of the present invention.

FIG. 4 is an explanatory view showing operating states of the surface spring material before and after seating in the embodiment of the present invention.

[Explanation of symbols] 1 Cushion frame 2 Surface spring material 3 Opening 4 Spring steel thin wire 5 Front torsion bar 6 Rear torsion bar 6a Bend 21 Square frame 22 Front rod 23 Rear rod

Claims (3)

[Claims] 1. A support device for a cushion pad in a vehicle seat, comprising a surface spring material (2) arranged in an opening (3) of a cushion frame (1) and supported by the cushion frame (1). Using a surface spring material (2) in which multiple thin spring steel wires (4) are stretched inside a rectangular frame material (21) that has both the rigidity and elasticity of
(2) to the cushion frame (1) on the front torsion bar
A support device for a cushion pad in a vehicle seat, which is elastically supported via (5) and a rear torsion bar (6). 2. A plurality of spring steel thin wires (4) are square frame members (21).
The support device for a cushion pad in a vehicle seat according to claim 1, which is stretched in the front-rear direction inside the vehicle. 3. The rear torsion bar (6) has a U-shaped bent portion (6a) which is deformed so as to bend the rear rod (23) toward the front side when receiving a load. A support device for a cushion pad in the vehicle seat according to claim 1.