JP3321741B2 - Seat device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat apparatus in which a support member such as a support panel for supporting a seat pad is elastically supported by a torsion bar.

[0002]

2. Description of the Related Art Conventionally, a seat device for elastically supporting a support member such as a support panel for supporting a seat pad on a cushion frame by a torsion bar is disclosed in Japanese Unexamined Patent Publication No.
The thing disclosed in 200410 gazette is known.

As shown in this conventional example, a torsion bar of this type of a seat device has a structure in which one end of a torsion bar is locked to a cushion frame and the other end is locked to a support panel. It is locked by the part and the bracket. Further, since one end (torque bar portion) of the torsion bar is locked to the cushion frame, the torque bar portion of the torsion bar and the cushion frame are located close to each other and possibly in contact with each other.

[0004]

However, when the torsion bar is rotated by a load, the central straight portion (torque bar portion) attached to the cushion frame is slightly bent with torsion. Therefore, when the torque bar portion and the cushion frame are close to each other, the torque bar portion and the cushion frame come into contact with each other to generate friction, which adversely affects the transmission of vibration.

[0005] It has been confirmed by experiments that this bending actually occurs. FIG. 6 is a perspective view showing the state of this experiment. A torsion bar 104 is held on holding bases 102 and 103 on a base 101. The holding member 103 on the arm portion 105 side rotatably holds the torsion bar 104 (5.5 mm in diameter). Table 101 and torsion bar 104
The pressure-sensitive paper 106 is inserted in between. In this state, a load of about 25 kg was applied to the arm 105 of the torsion bar 104 in the direction of the arrow L, and the torsion bar was twisted. As a result, the pressure-sensitive paper in the range of about 1/3 was discolored toward the non-rotation holding side (see FIG. 7). That is, the torsion bar 104 shown by the imaginary line in FIG. 8 is bent and deformed as shown by the solid line. If the load amount, the position of the load, the shape of the torsion bar, the constraint conditions, and the like are different, the deformation state changes accordingly, but in any case, it is considered that both the torsion and the bending occur.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a seat device having good vibration characteristics without causing frictional resistance due to contact between a torque bar portion and a cushion frame. .

[0007]

In order to achieve the above object, the present invention relates to a cushion frame mounted on a floor, one end of which is engaged with a cushion member, and the other end of which is engaged with a support member for supporting a seat pad. The support member is elastically supported on the cushion frame via the combined torsion bar, and the torsion bar has an end bent from a base end supported in the torsional direction on the cushion frame side, In the seat device, which is movably engaged with a long hole in the front-rear direction provided on at least one of front and rear sides of a support member for supporting the seat pad, the flat cushion cushion is provided.
Hanging on the bottom of the frame, the bottom of the cushion frame
When the torque bar part of the torsion bar
Toe to which torsion bar is placed and fixed at a height that can be evacuated
It is characterized in that it is equipped with a shock bar holding bracket .

[0008]

[Effect] Since the relief portion is provided on the cushion frame to avoid contact with the torque bar portion of the torsion bar, even if a load is applied to the torsion bar and the torque bar portion is twisted and bent, the two contact each other. Vibration characteristics can be favorably maintained without causing frictional resistance.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings. In FIGS. 1 and 2, a support panel 1 as a support member is formed of a support having a shape in which both sides are bank portions 1a and 1a and the center is concave. In FIG. 1,
Although not shown because it is partially cut away, the left and right sides of the seat have a symmetrical structure around the torsion bar holding brackets 4b-4b described later. In the torsion bar 3 provided between the cushion frame 2 and the support panel 1, one end (bent to form one side end) 3a of the torsion bar holding bracket 4 is provided.
a is attached to the cushion frame 2 via a, and the other end engaging portion (bent to form both side ends)
3 b is attached to the support panel 1 via the torsion bar set bracket 5.

An elongated hole 6 in the front-rear direction is provided at the portion of the torsion bar set bracket 5 with which the end engaging portion 3b of the torsion bar 3 engages. The engaging portion is caused to slide in the horizontal direction in accordance with the displacement of the end engaging portion 3b when the end portion is bent. By inserting the torsion bar 3 into the elongated hole 6 in a slightly twisted state in advance, a preload can be added to the torsion bar 3 when the support panel 1 is attached.

In the type in which the torsion bar 3 is used on both the front side and the rear side, it is not always necessary to provide the elongated holes 6 on both the front and rear sides, but only one side. In this case, play at the time of load is reduced, but illustration of this example is omitted.

Further, the cushion frame 2 is prevented from coming into contact with the torque bar portion 3c of the torsion bar 3 (which is rotatably held by four torsion bar holding brackets 4b fixed to the cushion frame 2). A hole 7 is formed as a relief portion (see FIG. 3). The relief portion provided in the cushion frame 2 is a torsion bar 3
The configuration is not limited to the hole 7 as long as the configuration avoids contact with the torque bar portion 3c. For example, the concave portion 8 as shown in FIG. 4 may be used, and the concave portion 8 as shown in FIG.
Not only the second stage (outside) concave portion 9 may be formed. In FIG. 5-B, a gap is provided between the torque bar portion of the torsion bar and the cushion frame by the torsion bar holding metal, and the contact between them can be similarly avoided.

The relief portion provided in the cushion frame 2 reduces friction and transmission of vibration between the cushion frame 2 and the torque bar portion 3c of the torsion bar 3, and reduces vibration characteristics of the seat. Helps improve.

Since the cushion frame 2 is provided with a relief portion for avoiding contact with the torque bar portion 3c, frictional resistance and transmission of vibration between the cushion frame 2 and the torque bar portion 3c can be reduced. As a result, the vibration characteristics with respect to the frequency of the sheet can be improved. That is, since the relief portion for avoiding contact with the torque bar portion 3c is provided on the cushion frame 2, the frictional resistance between the cushion frame 2 and the torque bar portion 3c can be reduced, and this frictional resistance adversely affects the vibration characteristics of the seat. Therefore, adverse effects on the vibration characteristics can be eliminated. Then, the vertical vibration of 6 Hz (Hertz), which is said to cause discomfort to humans, can be suppressed low.

In this type of seat device, it is said that the smaller the resonance frequency and the 6 Hz vibration transmissibility of the vibration characteristics with respect to the frequency of the seat are, the better the sitting comfort (feeling of sitting). A comparison test between the conventional product (having no escape portion) and the product of the present invention (having the escape portion with the hole 7) was performed. The resonance frequency of the conventional product was 3.29 Hz. The product of the present invention has a vibration transmission rate of 3.22 Hz and 6 Hz.
In all cases, the product of the present invention showed a small value, and the characteristics were improved as compared with the conventional product.

If the elongated holes 6 are used to support the torsion bar 3 on the support panel 1, the horizontal displacement of the torsion bar 3 when the torsion bar 3 is bent in the vertical direction can be absorbed. Is smooth, and the displacement on the support panel 1 side can be performed smoothly, thereby contributing to good vibration characteristics (transmittance-frequency characteristics).

In the embodiment, since the preload is applied to the torsion bar, the bending method may be set so that the support panel 1 starts to bend for the first time after a predetermined load is applied to the seating surface. it can. For this reason, it is possible to eliminate the "crumple feeling" that gives an unreliable impression at the time of sitting because the amount of deflection of the cushion at the time of sitting is too large. In addition, since it is possible to support at least one torsion bar on both the front and rear sides, the assembling workability can be improved.

[0018]

As described above, according to the present invention, the cushion frame is provided with the relief portion for avoiding contact with the torque bar portion of the torsion bar, so that the frictional resistance and the frictional resistance between the cushion frame and the torque bar portion are provided. Vibration transmission and the like can be reduced, the vibration characteristics with respect to the frequency of the seat are improved, and the seat has a good sitting comfort (seat feeling).

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment according to the present invention.

FIG. 2 is a side view of one embodiment according to the present invention.

FIG. 3 is a front view of a main part of the first embodiment for showing a relief portion of the cushion frame according to the present invention.

FIG. 4 is a front view of a second embodiment for showing a relief portion of the cushion frame according to the present invention.

FIG. 5 is a front view of a main part of a third embodiment for showing a relief portion of the cushion frame according to the present invention.

FIG. 6 is a perspective view of a torsion bar load experiment situation.

FIG. 7 is an explanatory diagram showing pressure-sensitive marks recorded on pressure-sensitive paper in a torsion bar load experiment.

FIG. 8 is an explanatory diagram showing a deformed state of a torsion bar in a torsion bar load experiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support panel 2 Cushion frame 3 Torsion bar 3b End engaging part 3c Torque bar part 4a Torsion bar holding bracket 4b Torsion bar holding metal fitting 5 Torsion bar set bracket 6 Elongated hole 7 Hole (escape part) 8 Depression (escape part) 9 Outside Recess (runaway part)

Continued on the front page (72) Inventor Nozomu Somura 3-10-10 Fukuura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Within Japan Hakko Co., Ltd. (72) Inventor Toshimichi Hanai 1 Natsushimacho, Yokosuka-shi, Kanagawa Nissan Motor Co. (72) Inventor Kazuto Kato 1 Natsushima-cho, Yokosuka City, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. (72) Inventor Hiromi Yamaura 560-2 Okazu Kokuhisa, Atsugi City, Kanagawa Prefecture Nissan Motor Co., Ltd. (56) Reference Document JP-A-4-200410 (JP, A) Japanese Utility Model 7-36785 (JP, U) Japanese Utility Model 7-20891 (JP, U) Japanese Utility Model Application 7-79743 (JP, U) Japanese Utility Model 7- 78443 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47C 7/02

Claims (1)

(57) [Claims] 1. The support member is mounted on the cushion frame via a torsion bar having one end engaged with a cushion frame placed on a floor and the other end engaged with a support member supporting a seat pad. The torsion bar is provided with an end bent from a base end supported in the torsion direction on the cushion frame side at least one of before and after a support member supporting the seat pad. a seat device comprising floating freely engaged in the longitudinal direction of the elongated hole has, vertical on the bottom surface of the cushion frame is formed flat
Of the torsion bar on the bottom of the cushion frame.
The torque bar has a height that can avoid contact during rotational deformation.
Torsion bar holding bracket to place and fix the torsion bar
Sheet apparatus characterized by comprising a.