JP3142441B2 - Device for supporting cushion pad in vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for supporting a cushion pad in a vehicle seat which can provide a comfortable feeling even when a thin cushion pad is used.

[0002]

2. Description of the Related Art To compensate for the lack of elasticity of a cushion pad, a seat spring material in the form of a surface spring is disposed in an opening of a cushion frame, and this is resiliently supported by a cushion frame with a tension spring. The pad support device is actually open flat 2-315.
No. 31, JP-A-62-42453, and the like.

However, in the conventional cushion pad supporting device of this kind of vehicle seat, a seat spring material is resiliently supported on a cushion frame by a number of tension springs on both sides thereof. The material is formed by extending a plurality of spring steel wires in the left-right direction between the rods on both sides of the rectangular frame material, so that there is no problem in terms of static sitting comfort, but dynamic sitting comfort, that is, vehicle A comfortable ride cannot be obtained against load fluctuations caused by the running vibration of the vehicle or irregular movement of the center of gravity of the human body. In addition, when seated, a uniform load is not applied to both spring steel wires stretched in the left and right direction between the rod portions on both sides of the square frame material, that is, in the square frame material, so that the surface pressure is increased, so that a good cushioning property is obtained. In order to obtain it, a thick cushion pad had to be used. further,
A large number of tension springs are required to resiliently support the seat spring material on the cushion frame, resulting in a problem such as an increase in cost.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems and to make the cushion frame resiliently support the seat spring material with a slight tension spring. In addition to being able to reduce costs, the surface pressure of the seat surface is evenly generated, and it is stable against load fluctuations and movement of the center of gravity due to vehicle vibration and irregular movement. Of course, there is no problem, dynamic sitting comfort is good, and
An attempt to provide a cushion pad support device for a vehicle seat that has a good usability even when a thin cushion pad is used has been developed by the present applicant and has been previously disclosed in Japanese Patent Application No. 6-1.
It is the same as the cushion pad support device in the vehicle seat filed as No. 18430, but is improved to provide, in addition to all the features of the prior application, a cushioning property for the seated person's upper limb during pedal operation. It is an object of the present invention to provide a cushion pad support device for a vehicle seat, which further improves the vehicle performance and also has a side part holding property when traveling on a curve.

[0005]

SUMMARY OF THE INVENTION A cushion pad supporting device for a vehicle seat according to the present invention, which has been made to solve the above-mentioned problems, has a plurality of cushion pads provided inside a rectangular frame member having both required rigidity and elasticity. A front spring having a gate-shaped front frame spring is attached to a surface spring in which the spring steel wire is stretched in the front-rear direction, and a seat receiving spring material is provided so that its top rod portion is positioned higher than the front rod portion of the rectangular frame material. Characterized in that the front rod portion of the seat spring material is held non-elastically with respect to the cushion frame, and the rear rod portion is elastically supported via a tension spring. It is.

[0006]

The support device for a cushion pad in such a vehicle seat has a cushion frame mounted on a vehicle body, the cushion pad is mounted on a surface spring of a seat spring material, and the front end of the cushion pad is mounted on a front frame spring. If it is used while supported, the surface spring is a rectangular frame material having both required rigidity and elasticity, and spring steel wires extending in the front-rear direction are arranged.In addition, the mounting of the seat spring material to the cushion frame is The front rod part of the square frame material of the surface spring is held non-elastically by the cushion frame, and the rear rod part is elastically supported by the cushion frame via the tension spring, so it sits on the cushion pad. Then, the load extends in the front-rear direction with the upper limb portion near the knee being resiliently supported by the top rod portion of the gate-shaped front frame spring. This applies evenly to all spring steel wires, so that the surface pressure is equalized, and the square frame material has its rear portion facing downward with the front rod portion held non-elastically held by the cushion frame as the center. At this time, an excellent cushioning effect is exhibited by the elasticity of the both-sided rod portions having the required elasticity and the elasticity of the tension springs which resiliently support the descending rear rod portion on the cushion frame. Moreover, the front end of the cushion pad is extended at the time of pedal operation by extending the gate-shaped front frame spring at the front of the surface spring so that its top rod is positioned higher than the front rod of the square frame material. Since the front frame spring exerts an appropriate cushioning property even when is pressed down by the upper limb, the sense of discomfort experienced when operating the pedal can be eliminated.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In the figure, 1 is a shallow bucket-shaped cushion frame, and 2 is an opening 11 at the upper end of the cushion frame 1.
Are seated spring members which are arranged inside and are resiliently supported by the cushion frame 1. The front and rear rod portions 22 and 23 are made of a hard steel wire having a circular cross section having a diameter selected in a range of 2 mm to 8 mm or a thick wire having both required rigidity and elasticity. A surface spring is formed by stretching a plurality of, preferably 5 to 8 spring steel wires 25 at intervals of 50 to 60 mm between the front rod portion 22 and the rear rod portion 23 of the rectangular frame member 21 composed of 20 and a gate-shaped front frame spring 30 is provided at the front of the surface spring 20 so that the top rod 31 is located forward and higher than the front rod 22 of the surface spring 20. The side frame springs 40, 40, which are connected to the both sides of the rectangular frame member 21 obliquely upward with the leg ends and obliquely upward on both sides of the surface spring 20.
Is connected to both sides of the rectangular frame member 21 with its front end connected to both ends of the top rod portion 31 of the front frame spring 30. Reference numeral 27 denotes a horizontal core wire 27 such as a paper core connecting the intermediate portions of the spring steel wires 25 as necessary.
Each spring steel wire 2 even if used for a long time due to the spacer effect of 7
The interval between 5, 25 is always kept constant.

Each of the square frame member 21, the front frame spring 30, and the side frame springs 40, 40 of the seat spring member 2 is made of a hard steel wire or a thick wire having both required rigidity and elasticity. When each of the rectangular frame member 21, the front frame spring 30, and the side frame springs 40, 40 is bent from a thick wire, each portion is formed by bending each of the thick wire members. Even if they are integrated by means such as welding at the position, some of the square frame material 21, the front frame spring 30, and the side frame springs 40, 40 are bent from the same thick wire material, and these are combined. They may be integrated at any position. Further, the front rod portion 22, the rear rod portion 23, and the side rod portion 24 of the rectangular frame member 21 may have different wire diameters. Further, in the above embodiment, the square frame rod 21, the front frame spring 30, and the side frame spring 40 are all made of hard steel wire having a circular cross section. However, a flat steel wire or a pipe having a rectangular cross section is bent. The material of the square frame rod 21, the front frame spring 30, and the side frame spring 40 may be any material having the required rigidity and elasticity.

The seat spring member 2 is disposed in the opening 11 at the upper end of the cushion frame 1 and
The front caulking claw 12 formed by cutting the front rod portion 22 at the front edge of the opening of the cushion frame 1 holds the caulking claw 12 in a non-resilient or fixed state or a rotatable state with the caulking claw 12 serving as a hinge. The portion 23 is elastically supported on the front edge of the opening of the cushion frame 1 by an appropriate number of tension springs 4. The tension spring 4
The number of is usually two for each one on the left and right, but may be three or more, such as one at the center to tune the seat surface in addition to one for each left and right,
Further, the spring strength of each tension spring 4 may be varied.

[0010] With the above structure, the cushion frame 1 is attached to the vehicle body, and the seat spring member 2 is provided.
The cushion pad is mounted and supported on the surface spring 20 such that the front end thereof is entirely supported by the frame spring 30 and both sides are positioned inside the side frame springs 40, 40, and this is covered with a seat cover. If the surface spring 20
Is formed by stretching a plurality of spring steel wires 25 between the front rod portion 22 and the rear rod portion 23 of the rectangular frame member 21, so that the occupant's buttocks at the time of sitting are all spring steel wires arranged in the front-rear direction. Line 2
5, the load is applied perpendicular to all the spring steel wires 25, and the load is applied to the plurality of spring steel wires 25.
The force transmitted to each spring steel wire 25 and distributed to the front rod 2
2 is transmitted to the rear rod portion 23. And this front rod portion 22
And the force transmitted to the rear rod portion 23, the front rod portion 22 of the rectangular frame member 21 is held non-elastically with respect to the opening front edge of the cushion frame 1 as described above, Part 23
Is applied to the surface spring 20 in a state where the surface pressure is equalized by elastically supporting the cushion frame 1 with the tension spring 4, and the elasticity of the spring steel wire 25 and the both side rod portions 24 of the square frame material 21. 24 own elasticity,
The cushioning is performed by the elastic force of the tension spring 4, so that even if the cushion pad mounted on the surface spring 20 is extremely thin, a comfortable ride without a feeling of bottoming can be obtained.

That is, when seated, each spring steel wire 25 is bent downward as shown in FIG. 3 to exhibit a predetermined elasticity. In combination with the action of, it bends obliquely forward in a bow shape. At this time, the both-side rod portions 24, 24 work to prevent the rear rod portion 23 from bending excessively in an arcuate shape, so that the seating surface is formed in a bowl shape with good stability. . When traveling in this seated state, traveling vibration occurs and the load of the occupant changes vertically, front and rear, and left and right. When the vertical movement is applied to the surface spring 20, the front rod portion 22 is moved to the cushion frame. Since it is held non-elastically with respect to the front edge of the opening 1, the side rods 24, 24 move only in the direction of rotation about the front rod 22 as a central axis, and there is no extra movement in the lateral direction. Thus, a comfortable cushion effect can be obtained. Also, when the occupant's center of gravity moves left and right, the surface spring 20 naturally moves in the direction of rotation about the front rod 22 as a center axis, but at this time, the side rods 24, 24 are stretched as described above. As a result, the surface spring 20 always exerts a force to return to the normal position, and an extremely stable seating posture can be obtained. Further, even when the occupant's center of gravity moves back and forth, since the front rod portion 22 is held non-elastically with respect to the front edge of the opening of the cushion frame 1, the movement of the occupant in the front and rear direction is restricted. The change in the ride is small and a comfortable ride can be obtained.

As described above, the surface spring 20 in which a plurality of spring steel wires 25 are stretched in the front-rear direction in the rectangular frame member 21 is different from the case where the spring steel wires are stretched in the left-right direction. Since the load is distributed to the surface spring, the surface pressure is equalized, and therefore, even if the cushion pad mounted on the surface spring 20 is reduced in thickness, a sufficient cushioning effect can be obtained. The front rod portion 22 of the rectangular frame member 21 is held non-elastically with respect to the front edge of the opening of the cushion frame 1 to restrict movement in the front-rear and left-right directions. Because it is supported by spring 4 with spring,
Since the change in the seat surface is reduced with respect to the dynamic fluctuation during running, a comfortable riding comfort can be obtained.
Since the number of the tension springs 4 to be used is reduced by performing only the one rear rod portion 23, not only the parts cost can be reduced, but also the number of mounting steps can be simplified and the merit in cost reduction is great.

Further, the front end of the cushion pad mounted on the surface spring 20 extends at the front of the surface spring 20 such that the top rod portion 31 is positioned higher than the front rod portion 22 of the rectangular frame member 21. The front frame spring 30 is supported by the top rod portion 31 of the gate-shaped front frame spring 30, so that even when the front end of the cushion pad is pushed down by the upper limb when the driver sits down and operates the pedal, the front frame spring 30 is pressed. Due to the restoring force, an appropriate cushioning property is exhibited, and the sense of discomfort experienced when operating the pedal is eliminated. Further, as in the embodiment, the side frame springs 4 which are inclined obliquely upward on both sides of the seat spring material 20.
In the configuration provided with 0, 40, the side frame springs 40, 40 support the occupant from both sides via the cushion pads, and therefore, can secure the side holdability during curve running. This side frame spring 40,
When the front end of the front frame spring 40 is connected to the front frame spring 30, the spring force of the front frame spring 30 is enhanced by the side frame springs 40, 40, and the spring force of the side frame springs 40, 40 is also increased by the front frame. This is more preferable because it is strengthened by the spring 30.

[0014]

As is apparent from the above description, the present invention arranges a surface spring in which a spring steel wire is stretched in the front-rear direction at the opening of the cushion frame so that the front end of the cushion frame is not resilient. By holding it spontaneously and supporting the rear end resiliently via a tension spring, the surface pressure on the seat surface is evenly generated and a good feeling of use can be achieved even when using a thin cushion pad. In addition, the surface spring can be resiliently supported by a slight tension spring on the cushion frame, so that it can be provided at low cost.In addition, a gate-shaped front frame spring is provided at the front of the surface spring with a top rod. The front end of the cushion pad is pushed down by the upper limb during pedal operation by extending it so that it is positioned higher than the front rod of the square frame material. Frame spring exerts a moderate cushioning property can eliminate the discomfort experienced during pedal operation, further,
The side frame springs provided with diagonally upwards on both sides support the occupant from both sides via cushion pads because the side frame springs can secure the side holdability during curve running. It is stable against load fluctuations and movement of the center of gravity due to running vibrations and irregular movements of the vehicle, and there is no problem with static sitting comfort, as well as good dynamic sitting comfort. There are various advantages. Therefore, the present invention greatly contributes to industrial development as a cushion pad support device for a vehicle seat that has eliminated the conventional problems.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a side view showing a state before and after the surface spring is seated in the embodiment of the present invention.

FIG. 4 is a perspective view showing another embodiment of a seat spring material to which the tension spring of the present invention is attached.

FIG. 5 is a perspective view showing another embodiment of a seat spring material to which the tension spring of the present invention is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cushion frame 2 Seat spring material 11 Opening 20 Surface spring 21 Square frame material 22 Front rod part 23 Rear rod part 24 Side rod part 25 Spring steel wire 30 Front frame spring 31 Top rod part 40 Side frame spring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Showa 56-36261 (JP, U) Japanese Utility Model Showa 57-40354 (JP, U) Japanese Utility Model Showa 62-2649 (JP, U) Japanese Utility Model Showa 55- 152155 (JP, U) Japanese Utility Model Showa 52-35306 (JP, U) Japanese Patent Publication No. 55-9203 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47C 7/02 A47C 7 / 14 A47C 7/28 A47C 7/32 A47C 7/34 A47C 7/35

Claims (3)

(57) [Claims] 1. A face spring (20) having a plurality of spring steel wires (25) stretched in the front-rear direction inside a rectangular frame material (21) having both required rigidity and elasticity, and a gate-shaped front part. The frame spring (30) is extended so that its top rod (31) is positioned higher than the front rod (22) of the rectangular frame (21). ) Opening (11) and the cushion frame (1)
Characterized in that the front rod portion (22) of the seat receiving spring material (2) is held non-elastically and the rear rod portion (23) is elastically supported via a tension spring (4). A device for supporting a cushion pad in a vehicle seat. 2. The cushion pad supporting device for a vehicle seat according to claim 1, wherein side seat frame springs (40) are provided on both sides of the seat spring member (2). 3. The cushion pad supporting device for a vehicle seat according to claim 2, wherein the front ends of the side frame springs (40) are connected to the front frame springs (30).