JP2656715B2 - Integrated frame structure for vehicle seats - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure for a vehicle seat, and more particularly to a frame structure for a vehicle seat that can be formed into a frame structure that can appropriately cope with a load applied to the frame.

[0002]

2. Description of the Related Art Conventionally, a frame 31 of a vehicle seat basically comprises a side frame 32, an upper frame 33 and a lower frame 34, as shown in FIG. An upper bracket 35 for securing strength and attaching a headrest is attached between the left and right sides of the upper frame 33.

The frame structure shown in FIG. 1 is formed in consideration of the magnitude and direction of the load applied to the frame 31. For example, the side frame 32 is formed to have a substantially U-shaped cross section and is formed so as to be able to cope with a load in the left and right outer directions, and the upper frame 33 is a portion having the largest load, and copes with a load from all directions. (See FIGS. 10A and 10B).

Accordingly, the left and right side frames 32, upper frame 33, and lower frame 34 having different cross-sectional shapes are usually formed as separate parts, and then integrated into a predetermined shape by welding or the like.

[0005]

However, since the welded portion of each of the frame parts 32, 33, and 34 is also a portion where the stress is concentrated when a load is applied, the management of welding and the like must be performed precisely. , One of the most difficult steps in the manufacturing process of the frame 31. In addition, the number of parts is large, and most of the parts are attached by welding. For this reason, the pipes and the substantially L-shaped materials used as the materials of the parts are not used for achieving the performance originally required for the frame 31 but rather for reasons such as welding conditions and ease of purchase. I had to choose from. For this reason, the components 32, 33, and 34 are often of unnecessarily high strength and quality in order to maintain the strength of the vehicle seat, and are wasteful.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat frame capable of appropriately coping with the shape and strength required for a vehicle seat frame and simplifying a frame manufacturing process. It is to provide an integrally molded structure. Another object of the present invention is to provide an integrated frame structure for a vehicle seat that can be integrally formed by securing necessary strength particularly in a direction and a size of a load at a top portion. . further,
Another object of the present invention is to provide a frame integral molding structure of a vehicle seat with high productivity.

[0007]

According to the present invention, as a technical means for solving the above-mentioned problems, the present invention comprises a left and right side portions forming a framework of a cushioning base material of a vehicle seat and a top portion including a corner portion. In a substantially U-shaped frame, the top portion has a substantially cylindrical cross section.
Top part and the side part are continuous from one veneer
We have created a frame integral molding structure characterized by being integrally molded in a shape . Further, in a frame formed into a substantially U-shape including a top portion including a left and right side portions and a corner portion, which are a framework of a cushioning base material of a vehicle seat, the top portion has a substantially U-shaped cross section. And this
Top part and the side part are continuous from one veneer
We have created a frame integral molding structure characterized by being integrally molded in a shape .

[0008]

According to the above-mentioned structure, it is possible to eliminate welding management for securing the strength, and it is possible to form a portion having a different cross-sectional shape which can correspond to the magnitude and direction of the load required for each portion of the frame from a single veneer. Since it is formed integrally by pressing or curling, its shape and thickness can be set freely according to the required strength without being limited by conditions such as welding. In addition, the number of places to be welded is reduced,
The number of parts is also reduced. In addition, by making the cross section of the top portion substantially cylindrical, it is possible to secure the strength of the top portion against a load and to form a reinforcing structure. Further, by forming the cross section of the top portion into a substantially U-shape, it is easy to integrally form the top portion and the side portions, and the moldability and productivity are improved.

[0009]

【Example】

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 for a frame 1 serving as a frame of a seat back. FIG. 1 shows a perspective view of the frame of the present invention. The frame 1 includes an upper side frame 5 and a lower frame 2.

The lower frame 2 is formed to have a predetermined size, and holes 3a and projections 3b for engaging the cushion base material and the skin are formed by punching or bending as in the prior art. The left and right ends are fixed to the lower end of the upper side frame 5 by welding.

The upper side frame 5 is integrally formed in a substantially U-shape as a whole, and
And the upper frame 33 are integrated. Initially, the upper side frame 5 is formed by punching a flat steel plate into a predetermined flat shape, and simultaneously punching necessary holes 7 and the like to form a base material. afterwards,
The left and right side portions 9 and the upper portion 14 are integrally formed by gradually bending the whole into a U-shape while gradually pressing and curling each.

That is, as shown in FIG. 1, the side portion 9 has a substantially isosceles triangular shape when viewed from the side, and has a substantially U-shaped cross section as shown in FIG. It is. The shape of the side surface 10 is substantially triangular in order to receive a load on the side portion 9 of the frame 1 in the seat front-rear direction. The reason why the cross-sectional shape is substantially U-shaped is to cope with the magnitude of the load received on the side portion 9. That is, approximately 2 to secure the strength of the side portion 9
Edges 11 at right angles to both sides of an equilateral triangular side surface 10
a and 11b are provided.

The shape of the side portion 9 will be described in detail. First, the central portion of the side surface 10 is shallowly bent inwardly into a concave shape, and the concave portion 12 is provided with a hole 7 having a predetermined shape. Further, a cut-and-raised shape having a predetermined shape is also formed on the front edge 11a (front side of the vehicle).

The upper portion 14 (corresponding to the top portion according to the first aspect) above the side portion 9 formed as described above is curled so that both end edges 11a and 11b are gradually wound inward. , Formed into a pipe shape. The upper portion 14 is a portion to which a large load is applied when the seat back is used, and is conventionally formed of a pipe-shaped component so as not to generate a foreign object feeling from the surface of the seat.

The upper portion 14 is a portion extending from above the side portion 9 to the upper frame portion 18 through a corner portion where the frame 1 is bent, and a cross section of the corner portion 15 is shown in FIG. I have. The corner portion 15 is formed by curling around the center of the inside of the frame 1 as a winding center. Here, the curling process is a process in which a winding margin 16 having a predetermined width is taken from both ends, and the winding margin 16 is bent into a substantially circular shape so that the winding margins 16 overlap. In particular, in the curling process of the corner portion 15, the winding allowance 16 is made slightly wider, and the winding allowance 16 is formed into a circular shape as close as possible to almost touch.

Further, the upper frame portion 18 is formed into a pipe shape by curling similarly to the corner portion 15, but the cross section thereof is processed into a substantially quadrangular shape. The upper frame portion 18 is a portion that has conventionally been constituted by two parts: an upper frame 33 and an upper bracket 35 for attaching a headrest and securing strength.

As shown in FIG. 2C, the upper frame portion 18 has a substantially quadrangular cross section different from the cross section of the corner portion 15, and is curled around the occupant's back side as the center of winding. However, the amount of entanglement is rather narrow. However, since the winding allowance is adjusted in this portion along the seat front-rear direction with a large load, it is possible to ensure strength equal to that of the conventional pipe structure. Further, two holes 19 penetrating vertically through the upper surface and the lower surface of the upper frame portion 18 are provided at predetermined positions. The holes 19 are provided at intervals for attaching a headrest, and are formed so that a fixing projection of the headrest can be fixed. Therefore, the cross-sectional shape of the upper frame portion 18 is formed so as to have a thickness for fixing the fixing protrusion. Further, a concave portion is formed in the hole 19 on the upper surface side so that a small protrusion formed in the outer peripheral direction of the fixing protrusion can be hooked.

At the lower end of the upper side frame 5 formed as described above, the left and right ends of the lower frame 2 are fixed by welding or the like to form a substantially square frame 1 as a whole.

Next, the operation and effect of the frame 1 thus integrally formed will be described. First, since the frame portions 9, 15, and 18 having various cross-sectional shapes can be formed by pressing or curling, the structure of the frame 1 can be freely designed and manufactured. That is, unlike the related art, there is no need to consider the configuration of parts based on welding conditions or ease of purchase, and the setting is made based on the strength and shape originally required for the frame 1. You can do it.

As a result, the number of components used in the manufacturing process of the frame 1 is significantly reduced as compared with the related art, so that the management of components and the like become easier. At the same time, the use of means such as welding in assembling the parts is reduced, so that the management of welding is greatly simplified. In addition, from the above, there is no needless thickness portion and the number of connection portions is reduced, so that the weight of the frame 1 is reduced as a whole.

Further, since it is formed integrally, the stress can be dispersed, and the overall strength does not decrease even if the thickness is made relatively thin. Further, by forming the frame 1 integrally, the frame 1 having a uniform strength and shape can always be provided, so that the quality of the frame 1 is stabilized. Particularly, since the upper portion 14 has a substantially cylindrical shape, it is possible to cope with a load in all directions in the vicinity of the corner portion 15 of the upper portion 14, and furthermore, the upper frame portion 18 requires a seating allowance from the occupant side. By forming it toward the rear side, it is designed to reinforce the load in the seat longitudinal direction. Further, it is difficult for the occupant to feel a foreign object feeling.

[Embodiment 2] Next, a frame 1A composed of an upper side frame 5A having a sectional shape of another embodiment will be described with reference to FIGS. The frame 1A has a lower frame 2 similar to the frame 1 of the first embodiment, and the upper side frame 5A has an overall shape similar to that of the upper side frame 5 of the first embodiment, and the left and right side portions are implemented. It has the same shape as the side part 9 of Example 1.

Upper part 1 of upper side frame 5A
4A is formed continuously and gradually narrower from the upper end side of the side portion. That is, in the dd section of FIG. 3, as shown in FIG. 4 (a), the left and right sides of the upper portion 14A are formed in a substantially U-shape cross section opened inward of the frame 1A similarly to the side portions. ing. Therefore, although the boundary between the side portion and the upper portion 14A is not clear, a portion similar to the upper portion 14 in the first embodiment corresponds to the upper portion 14A in the present example.

From the left and right sides of the upper portion 14A, the upper frame 18
The frame 5A is bent substantially at right angles toward A. The cross section of the bent corner portion 15A is maintained in a substantially U-shape, and the opening side is bent so as to gradually face downward while pointing toward the inside of the frame 1A. As shown in FIG. 4B, which is an ee cross section of FIG. 3, the upper frame portion 18A is opened so that its cross section is directed substantially downward. Further, a hole 19A through which a headrest support can be inserted is formed in the upper surface facing the opening side. The cross-sectional shape of the upper portion 14A (dd cross section, ee cross section)
May be substantially U-shaped as shown in FIGS. 5 (a) and 5 (b).

By forming the cross section of the upper portion 14A in a substantially U-shape or a substantially U-shape, the same operation and effect as in the first embodiment can be obtained. That is, even with a substantially U-shaped cross section, sufficient strength can be imparted to the load applied to the upper portion 14A, so that the operation and effect of the first embodiment can be sufficiently exhibited. in addition,
Since the cross-sectional shape is simpler than in the first embodiment, the bending can be simplified. That is, FIG.
As shown in the above, in the bending die composed of the upper die and the lower die for bending, the steel plate is securely supported by the lower die and the upper die, and as a result, the bending process for forming a U-shaped cross section In addition, the bending of the corner 15A can be performed continuously and easily.

The terminal side of the cross-sectional shape of the upper portion 14A, the corner portion 15A, and the upper frame portion 18A in this example is as shown in FIGS. 4 (c) and 4 (d) and FIGS. 5 (c) and 5 (d). In addition, it can be formed in a step shape (bead shape) that expands. By adopting such a terminal shape,
In particular, it is possible to secure the opening on the opening side of the cross section of the upper portion 14A, which is a portion having a small outer shape, and it is easy to put in and out of the bending mold, so that productivity can be improved. Further, in the U-shaped cross section or the U-shaped cross section, the strength of the cross section becomes lower and lower as the traverse becomes longer, and dents (buckling) occur, thereby resulting in deformation of the product and strength of the product. May decrease. However, by forming the terminal in a stepped shape, the section modulus can be increased to reinforce the dent in the transverse direction, and the deformation and the reduction in strength can be prevented.

In this embodiment, the headrest support mounting portion is provided with a hole 19 in the upper frame portion 18A of the frame 5A.
A is provided by penetrating A, as shown in FIG.
In particular, the pipe-shaped headrest support member 20 may be separately attached without providing the hole 19A. According to this, the number of members increases and welding is required.
Since the change in the cross-sectional shape of A can be reduced and the bending formability can be improved, the overall productivity is improved.

The frame 1, 1A according to the present invention is particularly applicable to a sports type seat (for example, a conventional bucket type seat) which is required to respond to the load direction and strength of the seat. High effect.

In the first and second embodiments, the frame 1, 1A of the seat back of the vehicle seat has been described.
It is not limited to this. For example, as shown in FIG. 8, the present invention can be applied to a frame 21 of a seat cushion. In the example shown in FIG.
2 (corresponding to the top part in claim 1) and the side part 23 are constituted by a substantially U-shaped side frame 24 and a rear frame 25 which are integrally formed.
The front portion 22 of the side frame 24 is formed into a pipe shape by curling, and the side portion 23 is formed to have a substantially U-shaped cross section. The same effect as that of the frames 1 and 1A can be obtained for the frame 21.

[0030]

As described above, according to the first aspect,
According to the invention, the frame of the vehicle seat is formed from one veneer
Simplify frame manufacturing process by molding in one piece
And can be
It is possible to appropriately cope with different shapes and strengths. Especially
According to the first aspect of the present invention, the top portion is easily strengthened.
Degree can be given. According to the invention of claim 2
Then, while providing the effect of the invention described in claim 1,
It can be easily molded integrally.

[Brief description of the drawings]

FIG. 1 is a perspective view of an integrally molded seat back frame according to a first embodiment.

FIG. 2 is a diagram of an aa section, a bb section, and a cc section shown in FIG.

FIG. 3 is a perspective view of an integrally molded seat back frame according to a second embodiment.

FIG. 4 is a sectional view taken along line dd (a) of FIG.
It is a figure of d).

FIG. 5 is a diagram showing another mode of the dd section and the ee section of FIG. 3;

FIG. 6 is a diagram showing a relationship between a frame 1A and a bending mold in bending.

FIG. 7 is a perspective view of an integrally molded frame when a headrest support attachment member is separately provided.

FIG. 8 is a perspective view of an integrally molded seat cushion frame.

FIG. 9 is a perspective view showing a conventional seat back frame.

10 is a diagram of a cross section taken along line aa (a) and a cross section taken along line bb (b) of the frame shown in FIG. 9;

[Explanation of symbols]

1, 1A, 21 ... frame 9, 23 ... side part 14, 14A, 22 ... top part (upper part or front part) 15, 15A ... corner part

Claims (2)

(57) [Claims] 1. A substantially U-shaped frame comprising left and right side portions forming a framework of a cushioning base material of a vehicle seat and a top portion including a corner portion, wherein the top portion has a substantially cylindrical cross section. And this top part
The side part is integrally formed continuously from one veneer.
The frame is integrally molded. 2. A frame formed in a substantially U-shape comprising left and right side portions forming a framework of a cushioning base material of a vehicle seat and a top portion including a corner portion, wherein the top portion has a substantially U-shaped cross section. This top part
And the side part are continuously integrated from one veneer
A frame-integrated molding structure characterized by being shaped.