JPH05115329A - Sheet frame - Google Patents

Abstract

PURPOSE:To achieve stability of quality and reduce the weight of a frame by ensuring strength, lateral rigidity, twisting rigidity and surface rigidity with respect to a load given back and forth with a less thickness. CONSTITUTION:A panel type sheet frame 1 is built with a sheet surface 2, a back surface 3 and a flange surface 4 on both sides thereof. The back surface 3 of the sheet frame is provided with an angle rib 5 which comprises a pair of ribs A and B extending from the upper center position to the upper end of the flange surface 4 and both sides of the lower end of the back surface 3. a cross rib 6 which comprises a pair of ribs C and D extending from both sides of the upper end of the flange surface 4 to both the sides of the lower end of the back surface 3 in X and a lateral rib 7 which comprises a rib E extening between both sides of the upper end of a flange surface 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel type seat frame, and more particularly to improvement of the rib structure thereof.

[0002]

2. Description of the Related Art Panel type seat frames include those made of metal such as steel plate and aluminum, and those made of fiber reinforced synthetic resin (FRP), but it is necessary to secure predetermined strength and rigidity. Various types are known depending on the presence or absence of reinforcing ribs and the shape of the ribs.

A specific example will be described with reference to FIG. The seat frame 11 shown in (a) is not provided with ribs and has strength and rigidity only by the plate thickness. (b)
The seat frame 12 shown in FIG. 2 is provided with a pair of vertical ribs 13 on both sides of the back surface. In the seat frame 14 shown in (c), one vertical rib 15 is provided at the center of the back surface, and a plurality of independent triangular ribs 16 are provided on both sides of the vertical rib 15. The seat frame 17 shown in (d) is provided with an X-shaped cross rib 18 on the back surface and a lateral rib 19 connecting the upper ends thereof, and further a plurality of small ribs 20 for increasing the rigidity of the back surface. It is provided.

[0004]

However, the seat frame 11 shown in FIG. 4 (a) has a problem in that it has a large weight and a particularly low sense of rigidity with respect to twisting because strength and rigidity are secured only by the plate thickness. There is. Also in the seat frame 12 shown in (b), the vertical ribs 13 alone increase the strength against longitudinal loads, but the torsional rigidity is particularly low.
As in the case of (a), it is necessary to increase the plate thickness in order to secure the rigidity, and there is a problem that the weight becomes large.

Also in the seat frame 14 of (c), since the triangular rib 16 is provided centering on the vertical rib 15 at the center, there is a problem that torsional rigidity is particularly weak and lateral rigidity is low. Further, in the seat frame 17 of (d), the lateral rigidity and the torsional rigidity are also increased, but it is difficult to secure the strength of the portion because the stress is concentrated on the intersection 18a of the cross rib 18 when the torsional force acts. There is a problem,
There is also a tendency that the surface rigidity of the back surface is slightly insufficient.

The present invention solves the above-mentioned conventional problems, and secures strength against transverse loads, lateral rigidity, torsional rigidity, and surface rigidity with a thin plate thickness, and achieves stable quality and weight reduction. It is intended to provide a seat frame of.

[0007]

A seat frame according to the present invention is provided on a back surface of a panel type seat frame having a seat surface, a back surface, and flange surfaces on both sides thereof.
A pair of ribs A and B connecting the center position above the upper end of the flange surface to both lower ends of the back surface, a pair of ribs C and D connecting both upper ends of the flange surface and both lower ends of the back surface in an X shape, and the upper end of the flange surface. A rib E connecting both sides is provided.

[0008]

According to the present invention, the chevron ribs and the ribs C and D composed of the ribs A and B are formed together with the flange surface against the longitudinal load.
The cross ribs made up of the ribs act and the deformation of each rib is restrained at the connection point between these ribs and the connection point with the horizontal rib made up of the rib E to ensure the reinforcing action, ensuring sufficient strength. To be done. With respect to lateral rigidity, a mountain-shaped rib composed of ribs A and B acts, and its deformation is restrained by ribs C, D and rib E connected to these ribs, so that sufficient rigidity is obtained. Secured. further,
A cross rib composed of a flange surface and ribs C and D acts on the torsional rigidity, and the stress is dispersed at the connection points with the ribs A and B connected to these ribs, and the stress concentrates at the cross points of the cross ribs. As a result, sufficient torsional rigidity is secured without generating excessive stress at a specific location. Further, the triangular rib having each side of the central pentagonal rib as one side is formed, so that the surface rigidity of the back surface is also secured. Thus, strength and rigidity can be secured against all loads that are assumed by the triangular rib reinforcing structure formed by the flange surface and each rib.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a view of a panel type seat frame 1 as seen obliquely from below on the rear side, and FIG. 2 is II-- of FIG.
FIG. 2 is a sectional view taken along the arrow II. Seat frame 1 is seat surface 2
And a back surface 3 and flange surfaces 4 on both sides thereof. The back surface 3 has a pair of ribs A connecting a central position above the upper end of the flange surface 4 and both lower ends of the back surface 3,
From a chevron rib 5 made of B, a pair of ribs C and D connecting the upper end sides of the flange surface 4 and the lower end sides of the back surface 3 in an X shape, and a rib E connecting the upper end sides of the flange surface 4. And a horizontal rib 7 that is provided. As shown in FIG. 2, each of the ribs 5, 6 and 7 is composed of a groove-shaped rib projecting to the back side and having a substantially U-shaped cross section.

Reinforcing collars 8 having an L-shaped cross section are provided on the edges of the seat surface 2, the back surface 3 and the flange surface 4 over the entire circumference of the seat frame 1.

Next, the operation of the above rib structure will be described with reference to FIG.

For front and rear loads, a chevron rib 5 composed of ribs A and B and a cross rib 6 composed of ribs C and D act together with the flange surface 4, and a lateral rib composed of a connecting point between these ribs and a rib E. Since the deformation of each rib is constrained at the connection point with 7, the reinforcing action becomes reliable and sufficient strength is secured.

For the lateral rigidity, the chevron rib 5 composed of the ribs A and B acts, and the cross rib 6 composed of the ribs C and D and the lateral rib 7 composed of the rib E are connected to these ribs. Sufficient rigidity is secured by restraining the deformation.

Furthermore, the flange surface 4 and the cross rib 6 composed of the ribs C and D act on the torsional rigidity, and the stress is dispersed at the connecting points of the ribs A and B connected to these ribs, so that the cross rib C is formed. , D does not concentrate on the cross points, so that sufficient torsional rigidity can be secured without generating excessive stress at a specific location.

Further, the surface rigidity of the back surface 3 is also ensured by forming the triangular rib having each side of the central pentagon as one side.

Thus, the flange surface 3 and the ribs A, B,
Since the triangular rib reinforcing structure formed by C, D, and E can secure strength and rigidity against all assumed loads, it is possible to reduce the plate thickness of the seat frame 1 as a whole and reduce the weight thereof. Further, it is not necessary to partially increase the plate thickness of the seat frame 1 to secure the strength, and the quality can be easily stabilized.

Further, when it is necessary to further increase the strength and rigidity, the thicknesses of the ribs A, B, C, D and E may be adjusted, and the thickness of the rib portion is easily adjusted. The seat frame 1 having high strength and rigidity can be easily obtained.

[0019]

According to the seat frame of the present invention, the flange surface, the chevron ribs A and B, the cross ribs C and D, and the lateral ribs E are provided.
By the interaction of, the strength against the front-back load, the rigidity in the lateral direction and the torsional direction and the surface rigidity are improved,
The overall thickness of the seat frame can be reduced to reduce weight, and it is not necessary to partially increase the thickness of the seat frame to secure strength, and quality can be easily stabilized. Exert the effect of. Further, when it is necessary to further increase the strength and rigidity, the thickness of the rib portion can be adjusted. Since the thickness of the rib portion can be easily adjusted, a seat frame having higher strength and rigidity can be easily obtained. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat frame according to an exemplary embodiment of the present invention as viewed obliquely from the lower rear side.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is an explanatory view of a reinforcing effect on strength and rigidity by ribs.

FIG. 4 is a perspective view of various seat frames of a conventional example.

[Explanation of symbols]

 1 seat frame 2 seat surface 3 back surface 4 flange surface 5 chevron rib composed of ribs A and B 6 cross rib composed of ribs C and D 7 lateral rib composed of rib E

Claims (1)

[Claims] 1. A pair of ribs A connecting a central position above the upper end of the flange surface and both sides of the lower end of the back surface to the back surface of a panel-type seat frame having a seat surface, a back surface, and flange surfaces on both sides thereof. B, a pair of ribs C connecting the upper end sides of the flange surface and the lower end sides of the back surface in an X shape,
A seat frame comprising D and a rib E connecting both upper ends of the flange surface.