JP4514483B2 - Seat cushion frame structure - Google Patents

Description

  The present invention relates to a frame structure of a seat cushion, and more particularly to a frame structure in a seat cushion configured by disposing cushion pads on a resin seat frame.

  In a conventional automobile seat, in order to ensure a good seating comfort for a seated person, an elastic support called a metal S spring that crosses the opening in the left-right direction is provided at the opening of a steel frame. A plurality of members are arranged at intervals in the front-rear direction, a cushion pad made of foamed synthetic resin, etc. is placed on this frame-like frame, and the surface is covered with a seat cushion cover. Yes.

  However, in the combined structure of the metal elastic support member and the cushion pad, the elastic support member does not elastically support the surface, so that it is not possible to obtain a continuity with respect to bending and vibration absorption at the time of sitting, and the sitting comfort is good. There may not be. In order to avoid this, a flattened member such as coarse felt may be incorporated between the cushion pad and the elastic support member, but there is a problem that the cost increases and the flexibility of the cushion pad may be impaired. .

  In order to solve such a problem, the applicant previously molded the upper surface plate 22 constituting the seating support surface and the peripheral surface plate 23 depending downward from the periphery thereof as shown in FIG. Proposing a resin seat frame 21 having at least one pair of concave groove portions 24 extending between the upper surface plate 22 and the peripheral surface plate 23 at opposite positions on both sides of the upper surface plate 22. (For example, refer to Patent Document 1).

  The support structure of the seat frame 21 will be described with reference to FIG. 6. The attachment portions 25 are recessedly formed from the upper surface plate 22 in the vicinity of the front side corners and the rear side corners of the seat frame 21. A nut member (not shown) is integrally fixed to the bottom by insert molding. 27a and 27b are left and right seat rail devices that support the seat frame 21 and are respectively composed of a lower rail 28 and an upper rail 29. The lower rail 28 is fixedly installed on the floor of the passenger compartment. Support portions 30 for fixing the seat frame 21 are provided at the front and rear portions of the upper rail 29, and the mounting portion 25 of the seat frame 21 is placed on the support portion 30, and mounting bolts 31 are formed on the support portion 30. The seat frame 21 is installed in the seat rail devices 27a and 27b by passing through the mounting holes, screwing into a nut member (not shown), and fastening.

According to such a configuration, when a seated person's load is applied to the upper surface plate 22 via the cushion pad, the load is transmitted to the mounting portion 25 via the upper surface plate 22 and the peripheral surface plate 23 to the support portion 30. In this case, the concave groove portions 24 continuously formed on both sides of the upper surface plate 22 from the upper surface plate 22 to the peripheral surface plate 23 are smoothly deformed by a load from above applied to the upper surface plate 22. The upper surface plate 22 is elastically displaced downward to elastically support the seated person and to ensure vibration absorption.
JP 2003-1111639 A

  However, in the resin-made seat frame 21 which has been bent by the load of the person seated as described above to obtain cushioning properties, when used continuously for a long time in a region where the temperature condition is severe, There is a problem that permanent distortion remains in the seat frame 21 and the original shape may not be restored.

  In view of the above-described conventional problems, the present invention provides a frame structure of a seat cushion that does not cause permanent deformation even under severe temperature conditions while ensuring cushioning with a sense of surface and continuity. Objective.

The frame structure of the seat cushion of the present invention, a resin seat frame at least 1 Taiyu the groove portion continuous over between the top plate and the peripheral surface plate opposing positions on either side of the upper plate and having a top plate and a peripheral surface plate When, in a frame structure of a seat cushion and a cushion pad mounted on the top plate, it is brought into contact with the lower surface immediately below the concave groove portion along the arrangement direction of the concave groove portion of the resin sheet frame It has a disposed metal elastic body .

According to this configuration, a resin sheet frame having an upper surface plate and a peripheral surface plate and having a plurality of concave grooves continuous between the upper surface plate and the peripheral surface plate is used, so that a cushioning feeling with a feeling of continuity and a continuous feeling is ensured. Since the metal elastic body is disposed so as to contact the lower surface of the resin sheet frame along the arrangement direction of the groove portions of the resin sheet frame, the permanent deformation occurs in the resin sheet frame. Can be prevented.

  In the frame structure of the seat cushion according to the present invention, the metal elastic body is arranged along the direction of the concave grooves in the lower part of the resin seat frame. It is possible to eliminate the possibility of permanent deformation even under various temperature conditions.

  Hereinafter, an embodiment of the frame structure of the seat cushion of the present invention will be described with reference to FIGS. 1 to 3 and FIG. 6.

  In FIG. 1, reference numeral 1 denotes a resin seat frame of a seat cushion in an automobile seat, which is composed of a synthetic resin molded product. The resin seat frame 1 is formed by integrally molding an upper surface plate 2 that constitutes a seating support surface and a peripheral surface plate 3 that hangs downward from the periphery thereof. In addition, a receiving recess 2a that gradually becomes deeper toward the rear is formed in the central portion of the top plate 2 so as to gently receive the buttocks of the seated person.

  A plurality of pairs (four pairs in the illustrated example) of recessed groove portions 4 that are continuous between the upper surface plate 2 and the peripheral surface plate 3 are formed at appropriate positions in the front-rear direction at opposite positions on both sides of the rear portion of the upper surface plate 2. Yes. Each groove 4 is formed by recessing the face plate of the resin sheet frame 1, and as shown in FIG. 3, the groove bottom 4 a is located from the intersection with the peripheral edge of the receiving recess 2 a of the top plate 2. It extends substantially horizontally toward the inside of the lower end of the peripheral surface plate 3 and is formed to have a substantially trapezoidal shape with the upper surface plate 2 as an upper surface and an oblique side, the peripheral surface plate 3 as a side, and the groove bottom portion 4a as a base in a front view. ing.

  As shown in detail in FIG. 2, a bottomed hollow conical mounting portion 5 whose diameter decreases downward is provided on the top plate near the front side corners and the rear side corners of the resin seat frame 1, respectively. Indented from 2, the nut member 6 is integrally fixed to the bottom thereof by insert molding. Further, on the lower surface of the resin sheet frame 1, a leaf spring material 7 is disposed as a metal elastic body across the front and rear mounting portions 5, 5 on both the left and right sides. In the illustrated example, nut members 6 are fixed to both ends of the leaf spring material 7 to be integrated with the resin seat frame 1. However, the resin seat frame 1 and the leaf spring material 7 are separated from each other. As shown in FIG. 6, when the mounting portion 5 is placed on the support portion 30 of the seat rail devices 27 a and 27 b and fastened and fixed by the bolt 31, the leaf spring material is interposed between the support portion 30 and the fixing portion 5. 7 may be installed together.

  The leaf spring material 7 is disposed along the arrangement direction of the recessed groove portions 4 by being disposed between the front and rear mounting portions 5 and 5 as described above, and immediately below these recessed groove portions 4. It is disposed in contact with the lower surface. Further, the resonance frequency region of the leaf spring material 7 is different from the resonance frequency region of the resin sheet frame 1.

  Further, as shown by phantom lines in FIG. 3, a cushion pad 8 made of foamed synthetic resin is mounted on the upper part of the resin seat frame 1, and the outer surface thereof is covered with a seat cushion cover 9 to constitute a seat cushion 10. Is done.

  According to such a configuration, when a load of a seated person sitting on the seat cushion 10 is applied to the upper surface plate 2 of the resin seat frame 1 via the cushion pad 8, the load is transmitted via the upper surface plate 2 and the peripheral surface plate 3. It is transmitted to the mounting portions 5 in the vicinity of the four corners and supported by the seat rail devices 27a and 27b via the support portions 30 shown in FIG.

  At that time, since a plurality of concave groove portions 4 continuing from the upper surface plate 2 to the peripheral surface plate 3 are provided at opposite positions on both side portions of the resin sheet frame 1, these are caused by an upward load applied to the upper surface plate 2. When the groove portion 4 is easily elastically deformed, the upper surface plate 2 and the peripheral surface plate 3 are elastically bent downward, and the upper surface plate 2 is elastically displaced downward. Thus, even when the cushion pad 8 having a small thickness is combined with a compact structure, the seat cushion 10 having a sufficient cushioning property, a smooth feeling and a continuous feeling can be obtained.

  In addition, since the face plate is continuous in each concave groove portion 4, there is little possibility of permanent deformation or cracking due to stress concentration on the notch portion even when a repeated load is applied, and the strength problem can be solved. A greater amount of bending can be obtained without fear of causing cracks or the like in the resin sheet frame 1.

  Furthermore, since the lower surface of the arrangement part of the concave groove part 4 is supported by the leaf spring material 7 on both sides of the resin sheet frame 1, the resin sheet frame 1 is used continuously for a long time in an area where the temperature condition is severe. However, since the metal leaf spring material 7 does not cause permanent deformation and has recoverability, permanent deformation of the resin sheet panel 1 can be effectively prevented.

  Further, by combining the elastic characteristics of the resin seat frame 1, the elastic characteristics of the leaf spring material 7, and the elasticity and damper characteristics of the cushion pad 8, high vibration absorbing performance is exhibited and the seating comfort of the seated person is improved. be able to. In particular, since the resonance frequency regions of the resin sheet frame 1 and the leaf spring material 7 are different, it is possible to improve the vibration absorption performance in a wide frequency band.

  In addition, excessive load is applied to the resin seat frame 1 when, for example, the board rides on the seat wildly or when a submarine load is generated when the occupant moves forward while sinking due to inertial force during a frontal collision. Even in this case, by being supported by the leaf spring material 7, it is possible to prevent the resin sheet frame 1 from greatly bending beyond the limit, and to prevent the resin sheet frame 1 from being cracked or damaged.

  In the above description of the embodiment, an example in which the leaf spring material 7 is disposed so as to contact the lower surface of the recessed groove portion 4 across the mounting portions 5 and 5 of the resin sheet frame 1 as a metal elastic body is shown. , S spring may be used. Further, as shown in FIG. 4, spring hook portions 11 are integrally provided on both sides of the front end portion and the rear end portion of the resin sheet frame 1 by insert molding or the like, and between the front and rear spring hook portions 11, 11. An S spring 12 as a metal elastic body is installed on the base plate, and these S springs 12 are brought into contact with the lower surface of both side portions of the receiving recess 2a of the upper surface plate 2 and the lower surface of the arrangement portion of the groove portion 4 to elastically support them. You may comprise so that it may do. Even if comprised in this way, there can exist an effect similar to the above.

  According to the frame structure of the seat cushion of the present invention, the metal elastic body is disposed along the arrangement direction of the concave groove portions at the lower part of the resin seat frame having a plurality of concave groove portions on both sides, and is flush with the resin seat frame. It is particularly useful for automobile seats where the interior of the vehicle may be exposed to high temperatures because it eliminates the possibility of permanent deformation even under severe temperature conditions while ensuring cushioning with a feeling of continuity. .

It is a top view of one embodiment of the frame structure of the seat cushion of the present invention. It is AA arrow sectional drawing of FIG. It is BB arrow sectional drawing of FIG. It is a top view of other embodiments of the frame structure of the seat cushion of the present invention. It is a perspective view of the seat frame of a prior art example. It is a disassembled perspective view which shows the attachment structure of a seat frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Resin sheet frame 2 Upper surface board 3 Peripheral surface board 4 Concave groove part 7 Leaf spring material (metallic elastic body)
10 Seat cushion 12 S spring (metal elastic body)

Claims (1)

A resin seat frame at least 1 Taiyu the groove portion continuous over between the top plate and the peripheral surface plate and having a top plate and a peripheral surface plate opposing positions on either side of the upper plate, a cushion mounted on the top plate a frame structure of a seat cushion and a pad that has a metal elastic body thereof underside is in contact be disposed right under the concave groove portion along the arrangement direction of the concave groove portion of the resin sheet frame The frame structure of the characteristic seat cushion.

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