JPH0581244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to seats, particularly automobile seats, and to improvements in a seat frame that supports the seat cushion of the seat.

Typically, a seat includes a seat cushion that elastically supports a seated person, a seat frame that supports the underside of the seat cushion, and support means that is disposed on the floor and to which the seat frame is attached. . Seats, especially car seats,
In recent years, seat frames have been made of resin to reduce weight.

For example, in U.S. Patent No. 4,065,182, a seat cushion is placed directly on a resin seat frame,
Further, in Japanese Patent Application Laid-Open No. 5-118715, a resin seat frame is provided with spring means, and the lower surface of the seat cushion is supported via this spring means.

(Problems to be Solved by the Invention) In general, automobile seats are required to have a spring constant as shown in FIG. 2 in the longitudinal direction of the seat. That is, the maximum spring constant point A is placed in front of the seated person's buttock support position HP, and the spring constant is gradually reduced in front of this point A.
Minimize the spring constant at the front end. In addition, on the rear side of point A, the spring constant is made slightly smaller and kept approximately constant.

This prevents the seated buttocks from sliding forward at point A, and weakens the supporting force of the knees at the front end of the seat, thereby smoothing the stepping action of the legs for pedal depression.

However, the spring characteristics of the sheet are determined by the hardness and thickness of the elastic sheet cushion. Therefore, if a seat with a seat cushion placed directly on a resin seat frame is used in an automobile, the seat cushion must be thick in order to absorb road vibrations and improve ride comfort. For reasons of economy, thickening the seat cushion causes the seat occupant's buttocks to slump. For this reason,
There was a problem in that it became difficult to press the pedals smoothly with the foot.

Further, in the case of a seat formed by disposing a spring means on a resin seat frame, since the seat cushion is elastically supported by the spring means, the seat cushion can be made thin and does not interfere with pedal depression. However, since the spring means must support the lower surface of the seat cushion, the shape of the spring means becomes complicated. For this reason, the assembly of the spring means to the seat frame becomes complicated, resulting in a problem that the seat becomes expensive.

Therefore, a technical object of the present invention is to solve the above-mentioned problems by elastically supporting the lower front portion of the seat cushion via the seat frame.

[Structure of the invention]

(Means for solving the problem) The technical means taken to solve the above problem is to form the seat frame with resin, and to form the seat frame approximately in the center in the front and back direction across the width of the seat. A support part made of resin that supports the cushion; and a support part made of resin that extends forward from the front end of the support part so that the tip thereof is free with respect to the support part; The seat cushion has a plane part made of resin that is swingable and elastically supports the front part of the seat cushion.

(Function) As a result, since the flat portion provided on the support surface of the seat frame is formed to extend further forward from the front of the approximately central portion of the seat frame, it is possible to substantially seat the seat via the seat cushion. Supports the knees of the person. Furthermore, since the seat frame is made of resin, the plane portion can swing vertically about the approximate center of the seat frame. This swingable plane part therefore elastically supports the front part of the seat cushion. Therefore, even if the seat cushion is thin, riding comfort can be ensured because it is elastically supported by the flat portion. However,
When you press your foot hard, the flat part bends downward, allowing smooth pedal operation.

(Example) Typical examples according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an automobile seat having a seat cushion 1 and a seat back 3. The lower surface of the seat cushion 1 is supported by a seat cushion frame 2, and between the seat cushion frame 2 and the floor (not shown) is a seat adjuster 5, which is a support means for the seat cushion frame 2.
6 is arranged, and seat adjusters 5 and 6 are arranged.
A cover 7 is attached to cover the.

The seat cushion frame 2 is formed by resin molding. And, as shown in Figure 3,
The seat cushion frame 2 has a rectangular shape as a whole. Side walls 9 are provided upright on both sides 13a, 13b and front and rear edges 13c, 13 of the seat cushion frame 2, and a support portion 8 is provided on the front edge 13c. The lower surface of the seat cushion 1 is supported by the support portion 8, and each side wall 9
The sides of the seat cushion 1 are held by the seat cushion 1.
Further, a flange is provided on the periphery of the seat cushion frame 2, and as shown in FIG. be stopped.

The front end of the support portion 8 of the seat cushion frame 2 is located approximately in the center of the seat cushion frame 2 in the front-rear direction, and a pair of left and right flat portions 1 extend from this front end toward the front edge 13c of the seat cushion frame 2.
1 is formed to extend. Therefore, the plane portion 11 is located at a portion that supports the left and right knee portions of the seat occupant via the seat cushion pad 1. Moreover, since the flat part 11 has a flat plate shape and is made of resin, it can move up and down about the front end of the support part 8.

The rear end of the support portion 8 of the seat cushion frame 2 is located approximately in the center of the seat cushion frame 2 in the front-rear direction, and another flat portion 12 extends from this rear end toward the rear edge 13 of the seat cushion frame 2. Currently being formed. Therefore, the flat portion 12 is located at a portion that supports the buttocks of the person sitting on the seat via the seat cushion pad 1. Furthermore, since the flat portion 12 has a flat plate shape and is made of resin, it is movable up and down about the rear end of the support portion 8 . Two notches 12a are formed at the rear end of the plane portion 12.

At the rear edge 13 of the seat cushion frame 2,
A pair of first locking grooves 1 facing rearward in the central part thereof.
5a, and a pair of second locking grooves 1 facing upward on both sides.
5b is formed. Each locking groove 15a, 15b
The base portion of the torsion spring 7 is engaged with. The ends of this torsion spring 17 are locked and fixed to both sides of the seat cushion frame 2. And torsion spring 1
7 elastically supports the rear end of the flat portion 12 upward. That is, the plane portion 12 elastically supports the buttock support portion of the seat occupant of the seat cushion 1. As shown in FIG. 3, there is a protrusion 12b on the lower surface of the rear end of the flat part 12 that extends in the left-right direction of the seat, and serves to restrict the forward movement of the tip 17a of the torsion spring 17. It is locked.

The support surface 8 and rear edge 13 of the seat cushion frame 2 are provided with mounting grooves 2 along the left and right direction of the seat.
1 and 22 are formed respectively. Each mounting groove 21,
Connecting members 23 and 24 that support the seat cushion frame 2 are fitted into the connecting members 22 . The connecting members 23 and 24 support the seat cushion frame 2 on the floor via the seat adjusters 5 and 6. Furthermore, the connecting member 24 is located below the root portion of the torsion spring 17 and supports the torsion spring 17 via the rear edge 13 of the seat cushion frame 2.

FIG. 6 shows a modified embodiment. This modified example differs from the previous example in that the flat portion 11 is provided only on one side. That is, the frame that requires the plane portion 11 may be only a seat for pedal operation. Therefore, in a so-called automatic vehicle, it is sufficient to provide only one plane portion. In this case, since the other support surface always supports the knee, the posture during pedal operation can be stably maintained.

〔Effect of the invention〕

According to the means of the present invention, since the front part of the seat cushion is elastically supported by the plane part that can swing in the vertical direction, the seat cushion can be moved without using a complicated spring means. With a simple structure that does not need to be thick, it is possible to ensure good riding comfort for the seated person by elastically supporting the front part of the seat cushion with the flat part, and the flat part does not move up and down with respect to the support part. By being able to swing in the direction, it is possible to ensure good pedal pressing operability for the seated person.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a seat having a seat frame according to the present invention, FIG. 2 is an explanatory view explaining the spring characteristics required of the seat, and FIG. 3 is a perspective view showing a seat frame according to the present invention. , FIG. 4 is a sectional view showing a cross section along the - line of FIG. 1, respectively;
And FIG. 5 is a perspective view showing a modified embodiment. 2... Seat frame, 8... Support surface, 11...
...Plane part.

Claims (1)

[Claims] 1. In a resin seat frame that supports a seat cushion, there is a resin support part that is formed approximately in the center in the front-rear direction and extends across the width direction and that supports the seat cushion, and a tip that extends forward from the front end of the support part. a flat surface made of resin that extends so as to be free with respect to the support part, is swingable in the vertical direction with respect to the support part, and elastically supports the front part of the seat cushion; A resin seat frame having a section.