JPH09383A - Structure of seat frame for vehicle and manufacture thereof - Google Patents

Abstract

PURPOSE: To simplify a frame production process by welding a mounting member on a cylindrical part at a stage of integral molding of a seat frame for a vehicle. CONSTITUTION: Notch parts each having a protrusion inside are formed on a rim part of a plate-shaped base material such as steel plate and a roughly U-shaped frame shaped upper side frame 2 is molded integrally having cylindrical parts with the rims thereof butting the frame. A support wire 5 is put on the notch parts to be positioned at the cylindrical parts while an electrode is kept in contact with each of the cylindrical parts so that the protrusion of the notch part presses onto the support wire 5 and then, a welding current flows. The protrusion on which the current is concentrated is welded to the support wire 5 and the support wire 5 fitted into a mounting hole formed in the notch part is welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat frame structure and manufacturing method.

[0002]

2. Description of the Related Art A conventional vehicle seat frame, for example, a seat back frame having a structure in which left and right side frames are connected by an upper frame and a lower frame, is manufactured by welding or the like after the respective parts are manufactured as separate parts. Since they are integrated in a substantially rectangular frame shape, the number of parts and man-hours increase, and it cannot be said that productivity is good. Therefore, the applicant proposes a frame integral molding structure for a vehicle seat described in Japanese Patent Laid-Open No. 6-70827, and appropriately responds to the shape and strength required for the frame of the vehicle seat, and The manufacturing process can be simplified.

An example of this type of frame will be described. As shown in FIGS. 7 to 9, a headrest support bracket 12 is provided on a tubular top portion 11a of a seatback frame 11 integrally formed in a substantially U-shape. The rod-shaped mounting member 13 is attached to the rear side of the tubular portion 11b of the side portion.
The left and right ends of the guide portion 12a are welded (see FIG. 9), and the lower end of the guide portion 12a extending from the headrest support bracket 12 and the intermediate portion of the mounting member 13 are welded. The seat back frame 11 has a U-shaped cross section (see FIG. 8).
The lower frame 14 is attached to the lower end 11c (see (b)), and the left and right are connected. As shown in FIGS. 8A and 9, the top portion 11a and the tubular portion 11b.
The abutting surfaces (slits) in (1) are welded as necessary to form joints 11d. In the figure, 11e is a window hole.

[0004]

In the above-mentioned conventional example, since the mounting member 13 and the seam 11d are welded after the seat back frame 11 is integrally molded, these steps are simplified to further reduce the cost. There is a request to achieve this. Further, in the conventional structure, the mounting member 1
Since 3 is placed on the tubular portion 11b of the seat back frame 11 and welded, that portion protrudes in the thickness direction of the frame, and the tactile feel from the seat surface is poor.

An object of the present invention is to, when attaching a mounting member to an integrally molded frame, have a structure in which an extra protrusion is not formed on the frame and to simplify the process of welding the mounting member. is there.

[0006]

For this purpose, the following structure and manufacturing method of a vehicle seat frame have been created.
That is, in a vehicle seat frame, a frame-shaped frame is provided with a mounting hole having a protrusion on its inner edge portion at an inner position of the frame, and the protrusion is welded to the mounting member inserted into the mounting hole. It is characterized by doing. Also, the structure of a vehicle seat frame is a structure in which a mounting member is welded to a frame-shaped frame integrally formed with a plate-shaped base material into a predetermined cross-sectional shape having a cylindrical portion, and the tubular portion is in a butted state. A notch portion having a protrusion therein is formed at an edge portion of the plate-shaped substrate to be formed, and the protrusion is welded to the mounting member inserted in the notch portion. There is. In a vehicle seat frame manufacturing method, a notch having a protrusion is formed inside an edge portion of a plate-shaped base material, and when the base material is bent to integrally form a frame-shaped frame, the edge portion is formed. The tubular parts are formed with the parts facing each other, a mounting member having a cross-sectional shape corresponding to the cutouts is applied to the cutouts, and then an electrode is brought into contact with the tubular parts to form the projections. It is characterized in that the protrusion is welded to the attachment member by pressing the attachment member and applying a welding current to the protrusion.

[0007]

The protrusion of the inner edge of the mounting hole formed in the frame is welded to the mounting member, and the mounting member is inserted into the mounting hole and then welded. Since the mounting hole is provided at the inner position of the frame, it is not possible to project in the frame thickness direction as in the case where the mounting member is superposed on the frame and welded, which is preferable as a vehicle seat frame. In addition, a frame-shaped frame is integrally formed by pressing or bending the plate-shaped substrate into a predetermined shape (also referred to as curling when the edge of the plate-shaped substrate is rolled up). In addition, a notched portion having a projection inside is formed in advance at an edge portion of the plate-shaped base material which is brought into a butted state when the tubular portion of the frame is molded. Then, the protrusion of the cutout is welded to the mounting member, and the mounting member inserted into the tubular portion through the cutout is welded to the frame. When this welding is performed, the mounting member is applied to the cutout portion at the stage of forming the tubular portion, the electrode is brought into contact with the tubular portion, and the projection of the cutout portion presses the mounting member so that the electrode is not attached. Welding current is passed through. Then, the current concentrates on the protrusion and heat is generated, and the protrusion is welded,
The mounting member is welded to the frame while being fitted into the notch.

[0008]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a seat back frame of a seat frame of a vehicle seat, FIG. 2 is a partial sectional view of the frame, and FIG. 3 is an enlarged view of a main part of the frame. As shown in FIG. 1, the seatback frame 1 has a configuration in which a lower frame 3 is joined to a U-shaped upper side frame 2, and a headrest support bracket 4 and a support wire 5 are further attached. The upper side frame 2 corresponds to the frame referred to in the present invention, and the support wire 5 corresponds to the attachment member referred to in the present invention.

The upper side frame 2 is a plate-shaped base material,
In this example, a steel plate is integrally formed by pressing or bending (including curling) into a substantially U-shaped frame as a whole, and the top portion 2a extending in the lateral direction is passed through the corners and the upper portions of the left and right side portions. The portion up to 2b (also referred to as "upper portion") is cylindrical, in this example, is rounded into a cylindrical shape having a slit (see FIG. 2 (a) and FIG. 3), and a cross section from that portion to the lower end portion 2c is substantially omitted. It is formed in a substantially U-shaped cross section (see FIG. 2B) through a C-shaped intermediate portion.

The upper portions (2a, 2b) are portions which are conventionally formed of pipe-shaped parts so that a heavy load is applied when the seat is used and moreover, a foreign substance is not felt from the surface of the seat. It has a cylindrical shape in order to secure the same strength as the conventional one and to avoid an increase in weight. Further, the side portion has a substantially isosceles triangular shape when viewed from the side, and the shape is set in consideration of the load applied to the seat back frame 1 in the seat front-rear direction.
As shown in FIG. 1 and FIG. 2B, the side portion is provided with unevenness for increasing rigidity, and the window hole 2d is opened to reduce the weight.

The upper side frame 2 has
The lower frame 3 as a strength member connecting the lower end portions 2c to each other is attached by welding. This lower frame 3
It has the same structure as the conventional one formed in a predetermined size, and is provided with a hole 3a for hooking the cushioning base material or the skin through the hooking tool.

Next, the headrest support bracket 4
A description will be given of the mounting of. As shown in FIG. 1, the top portion 2a of the upper side frame 2 has a predetermined position 2
e is crushed into a flat shape, and the pipe-shaped headrest support bracket 4 is welded thereto. A guide portion 4a having a substantially U-shaped cross section is extended to the headrest support bracket 4, and an intermediate portion of the support wire 5 is welded to a lower end portion formed in a substantially J shape.

In the present embodiment, the support wire 5 is formed by bending a wire rod into the shape shown in the drawing, and is formed with a substantially V-shaped engaging portion 5a for positioning the hog ring for suspending the seat cover. More specifically, both ends are attached to the left and right positions of the upper side frame 2 by the method described below in detail (see FIGS. 1 and 3).

Next, a method of welding the support wire 5 will be described. First, referring to FIG. 3, the above-mentioned plate-shaped base material punched out in a shape (not shown) in which the upper side frame 2 is expanded is shown in FIG. In advance, as shown in FIG. 4, a plurality of thin, substantially triangular protrusions 6a are formed, and a notch 7 having a size corresponding to the support wire 5 is formed at a position where the support wire 5 is to be joined. Formed and notch 7
A narrow triangular protrusion 7a is formed therein.

Then, at the stage where the tubular portion of the upper side frame 2 is molded, as shown in FIG. 6 (a), the end portion of the support wire 5 is applied to the notch portion 7, and further as shown in FIG. Then, the electrodes 8 arranged above and below are brought into contact with the tubular portion of the upper side frame 2, and the welding current is caused to flow while the projections 6a and 7a press the support wire 5. Then, the current is concentrated on the protrusions 6a and 7a, so that the portions generate heat and are welded to each other, and as shown in FIG.
Then, the mounting hole 7b is formed, and the end portion of the support wire 5 is fitted therein. In this way, the welding of the abutting portion (seam) and the welding of the support wire 5 are simultaneously performed. Since this welding is projection welding, if further welding strength is required, main welding such as continuous welding is separately performed. In that case, the welding work is simplified because there is no springback of the cylindrical portion in the state where the temporary welding has already been performed.

That is, conventionally, in addition to the step of forming the frame, the step of welding the joints of the abutting portions of the tubular portions and the step of welding the mounting member were required. In the integral molding process, it is possible to weld the butting portion (seam) and the supporting wire 5 at the stage of molding the tubular portion. As a result, the frame manufacturing process can be simplified, and the cost can be reduced. Further, unlike the conventional case, the portion where the frame mounting member is joined has a simple and reliable structure, and the mounting end portion of the support wire 5 does not project in the thickness direction of the frame on the back surface of the upper side frame 2, so that the seat surface is There is no feeling of foreign matter when touched, and the seat frame for a vehicle can be made preferable.

By the way, in this embodiment, the headrest support bracket 4 is attached to the upper side frame 2
Although the guide portion 4a and the support wire 5 are welded to the surface of the headrest support bracket 5 and the support wire 5, the headrest support bracket 4 and the support wire 5 are integrally provided with an attachment portion in advance, and the attachment portion and the support wire 5 are provided. It is also possible to sandwich and weld both ends of the upper side frame 2 to the upper side frame 2 by the method described above. In this way, the headrest support bracket and the support wire can be attached at the same time, and the frame manufacturing process can be further simplified.

Although the seat back frame has been described in the present embodiment, the present invention can be applied to a seat frame. Further, in addition to the present embodiment in which the mounting hole 7b is formed by the cutout portion 7, a frame formed by a pipe,
It is also conceivable that a window hole (mounting hole) having a projection is formed in advance so that the cross section of the pipe is deformed by the inserted mounting member and the projection is welded at the same time. In addition,
It is needless to say that the present invention can be implemented in various modified embodiments based on the knowledge of those skilled in the art.

[0019]

As described above, according to the present invention,
The portion where the mounting member is welded to the frame has a simple and reliable structure, and since no extra protrusion can be made in the thickness direction of the frame, there is no sense of foreign matter even when touched from the seat surface, and it is preferable as a vehicle seat frame. it can. Further, since the mounting member can be welded at the stage of molding the tubular portion of the frame, the frame manufacturing process can be simplified as compared with the conventional one, and the structure is suitable for an integrally molded frame and is easy to manufacture. That is, the welding work of the mounting member, which is a separate process in the past, can be incorporated into the frame forming process, and the frame manufacturing process can be simplified as a whole. Therefore, there is an effect that the cost of the vehicle seat frame can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a seat back frame of an embodiment.

FIG. 2 is a view showing a cross section taken along the line AA of FIG. 1 in (a) and a cross section taken along the line BB of FIG. 1 in (b).

FIG. 3 is an enlarged view of portion C of FIG.

FIG. 4 is a development view showing a part (a portion corresponding to FIG. 3) of the plate-shaped substrate of the example.

5 is a diagram showing a DD cross section of FIG. 3; FIG.

6A and 6B are views corresponding to a section taken along line EE in FIG. 5, in which FIG.

FIG. 7 is a perspective view of a conventional seat back frame.

FIG. 8 is a diagram showing a section taken along line FF in FIG. 7 and a diagram showing a section taken along line GG in FIG.

9 is a diagram showing a cross section taken along line HH of FIG. 7. FIG.

[Explanation of symbols]

 1 seat back frame 2 upper side frame 2a top part 2b upper part of side part 4 headrest support bracket 5 support wire (mounting member) 6a, 7a protrusion 7 notch 7b mounting hole

Claims (3)

[Claims] 1. A frame-shaped frame is provided with a mounting hole having a protrusion at an inner edge portion at an inner position of the frame, and the protrusion is welded to a mounting member inserted in the mounting hole. The structure of the vehicle seat frame characterized by. 2. A structure of a vehicle seat frame, wherein a mounting member is welded to a frame-shaped frame integrally formed with a plate-shaped base material into a predetermined cross-sectional shape having a cylindrical portion, wherein the tubular portion has a cylindrical shape. The plate-shaped base material that is brought into a butted state is formed with a notch portion having a protrusion inside, and the protrusion is welded to the mounting member inserted in the notch portion. The structure of the vehicle seat frame characterized by. 3. A plate-shaped base material is formed with a notch portion having a protrusion inside, and when the base material is bent to integrally form a frame-shaped frame, the edge portion is brought into a butted state. To form a tubular portion, apply a mounting member having a cross-sectional shape corresponding to the cutout portion to the cutout portion, and then bring an electrode into contact with the tubular portion to attach the mounting member by the protrusion. A method for manufacturing a vehicle seat frame, wherein the projection is welded to the mounting member by pressing and applying a welding current to the projection.