JP2008284275A - Seat pad structure for seat back - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the vibration of a plate is transmitted to a seated person via a seat pad on the plate, so as to give an unpleasant feeling to the seated person, since the plate is fixed to a seat back frame, thereby integrally vibrating the seat back frame and the plate due to the vibration from a vehicle floor. <P>SOLUTION: A urethane slab 12 with higher density and higher hardness compared with the seat pad 10 is fixed onto the plate 22 of the seat back frame 20 in a part corresponding to the lumbar vertebra of the seated person, and stored in a recession in the rear surface of the seat pad. The vibration transmitted from the vehicle floor to the seat back frame 20 integrally vibrates the seat back frame 20 and the plate 22, but the vibration to be transmitted from the plate to the urethane slab is absorbed and mitigated by the urethane slab. Furthermore, the vibration is also absorbed and mitigated in a transmission step from the urethane slab 12 to the seat pad 10, so that only the sufficiently suppressed vibration is transmitted to the lumbar vertebra of the seated person. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat back structure of a seat back in which a seat pad is disposed on a plate such as a back panel fixed to a seat back frame.

  For example, as described in Japanese Patent Application Laid-Open No. 10-236191, a split seat that is divided into a width of 6: 4 and becomes a seat for two persons + 1 is used as a rear seat of a vehicle. The split seat back frame is divided into a wide frame (a seat back frame for two people) and a narrow frame (a seat back frame for one person). Also, it has a substantially rectangular frame shape and can be moved forward. A plate such as a back panel is fixed to a substantially rectangular seat back frame, and a seat pad arranged on the plate is covered with a trim cover to constitute a seat back.

Usually, a plate such as a back panel is formed by pressing a steel plate into a shape having a large number of notches for weight reduction. As the seat pad, a foamed molded product of polyurethane foam is used. For example, as a seat pad of a seat back of a vehicle seat, the density is 0.028 to 0.034 g / cubic cm, and the hardness is 78.4 to 117.6 N / The thing of 314 square cm is used. In addition, as a seat pad of a seat cushion, a high density of 0.039 to 0.045 g / cubic cm and a high hardness of 245.0 to 284.2 N / 314 square cm are used. .
JP-A-10-236191

  In a seat pad structure of a seat back in which a seat pad is disposed on a plate fixed to the seat back frame, the plate is fixed to the seat back frame and integrated with the seat back frame. Therefore, the plate vibrates integrally with the seat back frame by the vibration transmitted to the seat back frame through the vehicle floor, and the vibration of the plate is transmitted to the seated person via the seat pad. In particular, vibrations during idling cause discomfort to the seated person and impair comfort.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seat back structure of a seat back that suppresses transmission of vibration through a seat pad disposed on a plate of the seat back frame.

  According to the first aspect of the present invention, a urethane slab having a higher density and a higher hardness than the seat pad disposed on the plate fixed to the seat back frame is fixed to the plate at a portion corresponding to the lumbar vertebra of the seated person. Intervened between the plates.

  In the present invention according to claim 1, since the urethane slab is fixed to the plate, it vibrates integrally with the plate. However, since the urethane slab made of the foam molded body is softer than the plate made of a steel plate or the like, Is absorbed and alleviated by the urethane slab. In addition, since urethane slabs are denser and harder than seat pads made of the same foamed molded body, and seat pads are softer than urethane slabs, vibrations are absorbed and alleviated even when they are transmitted from urethane slabs to seat pads. Is done. Therefore, only sufficiently suppressed vibration is transmitted to the seated person's lumbar spine, which reduces the discomfort and improves comfort.

  A urethane slab having a higher density and hardness than the seat pad disposed on the plate is fixed to the plate at a portion corresponding to the lumbar vertebra of the seated person and is interposed between the seat pad and the plate. For example, as a urethane slab, a polyurethane foam foam molded body having a density of 0.049 to 0.055 g / cubic cm, a hardness of 428.3 to 467.5 N / 314 square cm, and a thickness of about 10 mm is used.

1A is a front view of a seat pad of a seat back according to one embodiment of the present invention, FIG. 1B is a front view of a urethane slab, and FIG. 2 is a front view of a seat back frame.
In the embodiment, each of the seat pad 10 and the seat back frame 20 is divided into 6: 4, so that the width of the split seat is divided into 6 seats and 2 seats plus 1 seat. It is embodied as a seat pad and a seat back frame.

As shown in FIG. 1 (A), the seat pad 10 has a recess 10a on the back surface corresponding to the lower back pain that is pressed on the seated person's lumbar spine. The urethane slab 12 shown in FIG.
The urethane slab 12 is formed, for example, into a rectangular shape having a thickness of about 10 mm from a polyurethane foam foam.

  Here, the urethane slab 12 is formed with a higher density than the seat pad 10. For example, the general density of the seat back 10 of the seat back is 0.028 to 0.034 g / cubic cm and the hardness is 78.4 to 117.6 N / 314 square cm, whereas The urethane slab 12 is molded with a high density of 0.055 g / cubic cm and a high hardness of 428.3 to 467.5 N / 314 square cm.

  As shown in FIG. 2, the seat back frame 20 has a substantially rectangular shape, and a plate 22 such as a back panel is fixed from the center to one end (left end in FIG. 2), and the seat pad 10 disposed on the plate. Is covered with a trim cover to form a seat back cushion body. Since the configuration of the seat back frame 20 other than the plate 22 is irrelevant to the present invention and is a known configuration, the description thereof is omitted.

  In the present invention, the urethane slab 12 is fixed on the plate 22 of the seat back frame at a position corresponding to the recess 10a on the back surface of the seat pad 10 as shown by a one-dot chain line in FIG. For example, the urethane slab 12 is fixed to the plate 22 by adhesion, and can be fixed quickly and easily by using a double-sided tape.

  FIG. 3 shows a front view of a seat back frame in which seat pads are arranged. The urethane slab 12 fixed on the plate 22 of the seat back frame is accommodated in the recess 10a on the back surface thereof, and the seat pad 10 is disposed on the seat back frame 20 as shown in FIG. The seat pad 12 on the seat back frame is covered with a trim cover.

  Since the urethane slab 12 is fixed to the plate 22, the vibration transmitted from the vehicle floor to the seat back frame 20 causes the seat back frame and the plate 22 to vibrate integrally. Usually, the plate 22 is formed by pressing a steel plate, and the urethane slab 12 made of a foamed molded body is much softer than the plate. Therefore, vibration transmitted from the plate to the urethane slab is absorbed and alleviated by the urethane slab. . Furthermore, since the urethane slab 12 is molded with higher density and higher hardness than the seat pad 10 made of the same foamed molded body, and the seat pad is softer than the urethane slab, vibration is generated even when it is transmitted from the urethane slab to the seat pad. Absorbed and relaxed. Therefore, only sufficiently suppressed vibration is transmitted to the seated person's lumbar spine, and the discomfort with respect to vibration during idling is alleviated and comfort is improved.

  As described above, according to the present invention, since the urethane slab having a higher density and higher hardness than the seat pad is interposed between the plate and the seat pad, vibrations are suppressed, so that discomfort is reduced and comfort is improved. Is improved.

  The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention. All modifications, alterations, etc. within the technical scope of the present invention are included in the present invention. Needless to say.

  For example, in the example, a urethane slab having a density of 0.049 to 0.055 g / cubic cm, a hardness of 428.3 to 467.5 N / 314 square cm, and a thickness of 10 mm is used. The vibration is sufficiently damped and the discomfort is alleviated, and a good effect is obtained. However, the values of the density, hardness, and thickness are not necessarily limited. Moreover, although urethane slab is made into the substantially rectangular shape, it is not limited to a substantially rectangular shape, For example, it is good also as an elliptical shape which has a long diameter in an up-down direction.

  Further, in the embodiment, the width is divided into 6: 4, and is embodied as a seat pad and a seat back frame of a seat for two persons in a divided sheet that is divided so as to become a seat for two persons + 1. Yes. However, the sheet is not limited to the two-person sheet, and can be embodied not only in the single-person sheet but also in a sheet other than the divided sheet.

  The present invention can be widely used for a seat back of a seat in which a plate such as a back panel is fixed to a seat back frame.

(A) is a front view of the seat pad of the seat back which concerns on one Example of this invention, (B) shows the front view of a urethane slab, respectively. The front view of a seat back frame is shown. The front view of the seat back frame by which the seat pad is arrange | positioned is shown.

Explanation of symbols

10 Seat Pad 10a Recess 12 Urethane Slab 20 Seat Back Frame 22 Plate

Claims (1)

  A seat back and a seat pad that is placed between the plates by fixing a urethane slab of higher density and hardness than the seat pad placed on the plate fixed to the seat back frame to the plate at the lumbar vertebrae of the seated person. Construction.

Images