JPH11217031A - Frame structural body of seat back - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the pad breakage attributable to the level difference by welding each end part of a support wire to be horizontally stretched above an upper edge of a U-shaped side bracket at the position close to the upper edge of the side bracket to eliminate the level difference between the upper edge of the side bracket and a front side of a back frame. SOLUTION: An approximately inversely U-shaped back frame 3 in a frame structural body for a seat back is welded to a side bracket 2 at its right and left side parts, and a support wire 1 is horizontally stretched between the side parts of the back frame 3 above an upper edge 21A of the side bracket 2. Both end parts 11 folded downwardly at right angles of the support wire 1 are welded 11A at the front side of the back frame 3 with a lower end of both end parts 11 of the support wire close to an upper edge of a forward flange 21 of the side bracket 2. Generation of a level difference is eliminated between the upper edge 21A of a forward flange 21 and a forward side of the back frame 3, and the pad breakage due to hooking to the level difference is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure constituting a seat back (backrest) of an automobile seat (seat).

[0002]

2. Description of the Related Art A conventional seat back frame structure includes a pipe back frame (3) bent in a substantially inverted U-shape as shown in FIG. ) And (2) are welded in a holding manner and upper end edges (21A) and (21A) of both side brackets (2) and (2).
A) There is one above which a support wire is laid horizontally.

The above side brackets (2) and (2)
It is welded forward to the back frame (3), and a front flange (21) is provided along the front edge and a rear flange (22) is provided inward along the rear edge. The back frame (3) has a U-shaped cross section and is welded to the inner surface of the rear flange (22).

[0004] The left and right ends (10) of the support wire (1) are welded so as to be orthogonal to the axial direction of the back frame (3).

In FIG. 1, reference numerals (31) and (31) denote support cylinders for supporting a headrest, (32) a connecting pipe connecting both left and right free ends of the back frame (3), and (3).
3) shows a linear support wire.

FIG. 6 shows a part of FIG. 5 in an enlarged scale. The left and right ends (10) of the support wire (1) are welded (10A) to a pipe back frame (3). The distal end protruding portion (1A) of the portion (10) protrudes outward from the back frame (3). Also, the front flange (21) of the back frame (3) and the side bracket (2)
A gap (L) is formed between the upper edges (21A).

The above-mentioned seat back frame structure is
It is covered with a foam pad molded into a bag and the pad is covered with a trim cover to form a seat back.

[0008]

As described above, the above-mentioned frame structure is provided at both left and right ends (1) of the support wire (1).
0) protrudes outward from the back frame (3), and the side bracket (1)
Since there is a gap (L) between the front flange (21) and the back frame (3), the pad is formed by the projecting end (1A) of the support wire (1) and the upper edge of the side bracket (1). (21A) was caught and there was a problem that a pad was cut.

Further, the pad is formed of the support wire (1).
The tip protruding part (1A) of the
There was also a problem that the outer shape of the back frame (3) could not be covered.

Accordingly, an object of the present invention is to eliminate such disadvantages of the conventional product.

[0011]

In order to achieve the above object, a seat back frame structure according to the present invention is characterized in that both end portions of the support wire are located at positions near the upper edge of a side bracket in the back frame. By welding, a step formed between the back frame and the upper end edge of the side bracket is reduced.

Further, both ends of the support wire are bent at right angles, and the both ends are welded to the back frame in a downward direction and in the axial direction of the back frame so that the tip of the support wire is outside the back frame. As a result, the welding strength of the support wire with respect to the back frame is increased to improve the mounting strength of the support wire.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the drawing, (1) is a support wire, (2) is a side bracket welded to a pipe back frame (3), and the back frame (3), the side bracket (2), etc., excluding the support wire (1) are the same as those described above. The same members as the conventional product shown in FIG. 5 are used. In the drawing, the same reference numerals as those in FIG. 5 indicate the same members, and the description thereof will be omitted.

As shown in FIGS. 1 and 2, both ends (11) of the support wire (1) are bent downward at right angles toward the axial direction of the back frame (3). ) Is welded (11A) to the front surface.

The support wire (1) is positioned such that the lower ends of the left and right ends (11) of the support wire (1) are close to the upper end edge (21A) of the front flange (21) of the side bracket (2). Back frame (3)
Welded to.

Therefore, since both ends (11) of the support wire (1) are disposed between the upper edge (21A) of the front flange (21) and the front surface of the back frame (3), FIG. As shown in (1), there is no step to catch the pad (4).

Also, both ends (1) of the support wire (1)
Since 1) does not protrude outside the back frame (3), the pad (4) can be attached along the back frame (3).

FIG. 4 shows an automobile seat using the frame structure according to the present invention, wherein (SB) is a seat back, (SC) is a seat cushion, (HD) is a headrest, and (S) and (S). Indicates stays supported by a support cylinder (31) provided on the top of the back frame (3) shown in FIG. 5 integrally with the headrest (HD).

The frame structure is attached to a foam pad (4) molded in a bag shape, and the pad (4) is covered with a trim cover (5) to cover the seat back (S).
B).

The both ends (11) of the support wire (1) of the frame structure do not protrude outside the back frame (3) as described above, and the upper edge (21A) of the side bracket (2) does not protrude. ) And the front surface of the back frame (3), there is no step, so no pad breakage occurs.

[0021]

As described above, according to the present invention, since the both ends of the support wire are welded to the positions close to the upper edge of the side bracket, a step formed between the upper edge of the side bracket and the front surface of the back frame. Is reduced, and it is possible to prevent the pad from being cut due to the step.

In the present invention, both ends of the support wire are welded to the back frame so as to face downward and in the axial direction of the back frame. Therefore, unlike the conventional product, the projecting end portions at both ends of the support wire do not protrude outside the back frame, so that the pad can be prevented from being cut, and the joining area of both ends of the support wire to the back frame can be prevented. And the mounting strength of the support wire can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a partial sectional view showing a state where a pad is attached.

FIG. 4 is a partially cutaway perspective view showing a use state of the present invention.

FIG. 5 is a perspective view of a conventional product.

FIG. 6 is a partially enlarged perspective view of a conventional product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support wire 2 Side bracket 3 Back frame 11 End of support wire 21 Upper edge of side bracket

Claims (2)

[Claims] 1. A right and left side portion of a pipe back frame bent in a substantially inverted U-shape is welded into a side bracket having a U-shaped cross section, and a support wire is laterally provided above an upper edge of the side bracket. In a frame structure for a seat back that is bridged, a step formed between the back frame and the upper edge of the side bracket by welding both ends of the support wire to positions near the upper edge of the side bracket in the back frame. The frame structure of the seat back which is reduced. 2. The seat back frame according to claim 1, wherein both ends of the support wire are bent at right angles, and both ends are welded to the back frame in a downward direction and in the axial direction of the back frame. Structure.