JPH0620454Y2 - Vehicle seat cushion spring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to an improvement of a vehicle seat cushion spring.

2. Description of the Related Art Japanese Utility Model Laid-Open No. 58-191852 discloses a cushion device for a vehicle seat.

The first elastic support is stretched on the upper surface of the seat frame, and the second elastic support is stretched on the lower surface of the seat frame. When the weight of the occupant is small, the first elastic support is stretched. The second elastic support body tries to support it when the weight increases.

The problem to be solved by the invention is that the zigzag spring 1 as the conventional elastic support is linearly arranged in the lateral direction of the seat cushion as shown in FIG.

Therefore, when the occupant is seated, the zigzag spring 1 is bent as shown in FIG. 7, and the bottom of the butt 2 is pressed in the direction of arrow A. This is uncomfortable for the occupants.

Further, as shown in FIG. 7, each coil spring 8 which is a conventional elastic support is arranged below the zigzag spring 1 in such a posture that its coil axis is vertical and its circular upper edge portion forms a substantially horizontal plane. Has been done.

For this reason, when the occupant is seated, the circular upper edge portion of each coil spring 8 forming a substantially horizontal plane can only partially correspond to the occupant of the occupant having a curved surface, and as a result, each coil spring 8 is biased. Due to this partial compression, each coil spring 8 locally presses the occupant's hips. This is also uncomfortable for the passengers.

Means for Solving the Problems In order to solve the above problems, in the present invention, a plurality of zigzag springs arranged in a vehicle seat cushion and stretched in the vehicle front-rear direction, and below the zigzag springs are provided. In a vehicle seat cushion spring composed of a plurality of coil springs arranged, in a zigzag spring group at a location corresponding to the bottom of the occupant of the plurality of zigzag springs, a centerline in the seat cushion width direction at the location. Each of the zigzag springs arranged on both the left and right sides is made lower inside than the outside with respect to the centerline and is inclined downward toward the centerline. A circular arc-shaped concave portion is formed along the shape of the occupant's hip in the seat cushion width direction as a whole at a position corresponding to the lower part, and The ill spring adopts a configuration in which each coil axis is made substantially orthogonal to a tangent to an arc in the seat cushion width direction drawn by tracing the contours of all zigzag springs forming the recess.

Action The plurality of zigzag springs as a whole form arcuate recesses along the shape of the occupant's butt in the seat cushion width direction at locations corresponding to the occupant's bottom.

Therefore, even when the occupant is seated, the respective zigzag springs forming the arcuate recess along the shape of the occupant's hip do not project upward toward the occupant's butt, and each zigzag of the prior art shown in FIG. The occupant's hips can be supported in a wider area than the spring 1.

A plurality of coil springs are arranged below the zigzag springs, with each coil axis being substantially orthogonal to the tangent to the arc in the seat cushion width direction drawn by tracing the contours of all zigzag springs that form arcuate recesses. Has been done.

For this reason, when the occupant is seated, the circular upper edge of each coil spring substantially entirely corresponds to the occupant's butt along the recess, and each coil spring is substantially even in the direction in which the zigzag spring is displaced. The occupant's weight is supported by elastic deformation together with the zigzag spring without being compressed and hindering the shape of the recess formed by the zigzag spring.

At this time, each coil spring is compressed substantially uniformly in the displacement direction of the zigzag spring, and the degree of partial compression is smaller than that of each coil spring 8 of the prior art shown in FIG.

Embodiment FIG. 1 to FIG. 3 and FIG. 5 show an embodiment of a vehicle seat cushion spring according to the present invention.

As shown in FIG. 2, an upper frame member 4 is installed along the contour of the seat cushion 3 inside the vehicle seat cushion 3, and a plurality of zigzag springs 5 are provided between front and rear portions of the upper frame member 4. Have been passed over.

As shown in FIG. 1, FIG. 2 and FIG. 3, the zigzag spring 5 group is a left and right zigzag spring group 5A, which are arranged at positions offset to the left and right sides with respect to the center line in the seat width direction. In the 5B group and the 5C and 5D groups, the zigzag springs 5B, 5C and 5A, 5D at positions opposed to each other in the seat width direction have a lower inner side than the outer side in the seat width direction, and the shape of the occupant's hips. The zigzag springs 5 are arranged at positions corresponding to the bottom of the occupant's hips as a whole as shown in FIG.
A recess 6 is formed in the seat cushion width direction, and all the zigzag springs 5A, 5 forming the recess 6 are formed.
By tracing the contours of B, 5C and 5D, the arc 7
Is drawn.

The arrangement structure for forming such a recess 6 has a zigzag spring 5
It can be obtained by similarly inclining the locking portions between both ends of the upper frame member 4 and the upper frame member 4 (not shown).

Below the zigzag spring 5, two coil springs 8 arranged in the lateral direction are installed. These coil springs 8 are installed on the seat cushion frame 11 in a posture in which the coil shaft 9 is orthogonal to the tangent line 10 of the arc 7 of the zigzag spring 5.

Therefore, when the occupant is seated, the zigzag springs 5 extend in the longitudinal direction and are arranged on an arc as shown in FIG. 5 in the relationship between the adjacent springs. Therefore, as is clear from the comparison with FIG. 7, the side edge portion 12 of the zigzag spring 5 does not contact the occupant's hips 2.

As shown in FIGS. 3 and 5, each coil spring 8 has its coil axis 9 orthogonal to the tangent 10 of the arc 7 drawn by the zigzag spring 5, so that when the occupant is seated, 7, the circular upper edge of each coil spring 8 substantially corresponds to the occupant's butt 2 having a curved surface along the circumference 7, and each coil spring 8 has a direction in which the zigzag spring 5 forming an arc 7 is displaced. Is substantially uniformly compressed, and supports the occupant's weight by elastic deformation together with the zigzag spring 5 without hindering the shape of the recess 6 of the zigzag spring 5.

At this time, each coil spring 8 is compressed substantially uniformly in the displacement direction of the zigzag spring 5, and the degree of partial compression is smaller than that of each coil spring 8 of the prior art shown in FIG.
In the illustrated embodiment, the local compression of the occupant's hip 2 due to the partial compression of each coil spring 8 is reduced as compared with the prior art shown in FIG. 7.

The zigzag springs 5 may be arranged so as to draw a substantially arcuate "V" shape as shown in FIG. 4 instead of the arcuate shape as shown in FIG. The coil shafts 5 are arranged so that their coil axes 9 are orthogonal to the straight line corresponding portions of the V-shape.

Effect of the Invention In the present invention having the above-described configuration and operation, each zigzag spring that forms an arcuate recess along the shape of the occupant's hips when the occupant is seated on the seat cushion is provided in the seat cushion. Since it does not project upward toward the hip and can support the occupant's hip in a wider area compared to each zigzag spring 1 of the prior art shown in FIG. 7, not only when the occupant sits down, but also when the occupant moves up and down violently. Again, the local pressure on the occupant's hips by each zigzag spring is reduced compared to the prior art shown in FIG.

Further, in the present invention, when an occupant is seated on the seat cushion, the coil springs are compressed substantially uniformly in the displacement direction of the zigzag spring in the seat cushion, and the coil springs 8 of the prior art shown in FIG. Therefore, even when the occupant is seated, and also when the occupant is repeatedly violently moved up and down, local pressure on the hip of the occupant due to the partial compression of the coil springs is reduced as compared with the prior art shown in FIG. 7. .

Therefore, in the present invention, the local compression of the occupant's hip by each zigzag spring is reduced and the local compression of the occupant's hip caused by the partial compression of each coil spring is reduced in comparison with the prior art shown in FIG. Also, the squeezing and foreign body sensation of the occupant due to these local pressures are reduced, and as a result, fatigue of the occupant due to long-term sitting is alleviated, and good cushioning properties are exhibited.

[Brief description of drawings]

1 to 5 show an embodiment of a vehicle seat cushion spring according to the present invention, and FIG. 1 shows I- of FIG.
A sectional view taken along the line I, FIG. 2 is a perspective view of the interior of the vehicle seat cushion, FIG. 3 is a line obtained by tracing all zigzag springs in the lateral direction, and FIG. 4 is a similar line in a modified example of the present invention.
FIG. 5 is a view similar to FIG. 1 showing a seat cushion spring when a passenger is seated, FIGS. 6 and 7 show a conventional example, and FIG. 6 is a view corresponding to FIG. 1, FIG. [Fig. 6] is a view corresponding to Fig. 5. 3: seat cushion, 5 zigzag spring, 6: recess,
7: arc, 8: coil spring, 9: coil axis, 10: tangent line, 12: side edge of zigzag spring.

Claims (1)

[Scope of utility model registration request] 1. A vehicle seat cushion comprising a plurality of zigzag springs arranged in a vehicle seat cushion and stretched in the vehicle front-rear direction, and a plurality of coil springs arranged below the zigzag springs. In the spring, in a zigzag spring group at a position corresponding to the bottom of the occupant of the plurality of zigzag springs, each zigzag spring arranged on the left and right sides with respect to the center line in the seat cushion width direction at the position, respectively. The inner side with respect to the center line is made lower than the outer side, and is inclined downward toward the center line, and the plurality of zigzag springs as a whole in a position corresponding to the bottom of the occupant of the occupant in the seat cushion width direction. An arcuate recess is formed along the shape of the bottom of the zigzag, and the plurality of coil springs have the outline of all zigzag springs forming the recess. The tangent to the seat cushion width direction of the arc drawn by the sol, the vehicle seat cushion springs each coil axis is characterized by being brought substantially orthogonal.