JP5169210B2 - Back frame mounting structure - Google Patents

Description

  The present invention relates to a structure for attaching a back frame to a cushion frame.

As this type of back frame mounting structure, the mounting structure described in Patent Document 1 is known. In this attachment structure, a lower bracket is connected to a lower portion of a back frame (seat back frame) via a reclining mechanism, and the lower bracket is bolted to a rear portion of the cushion frame (seat cushion frame).
The lower bracket is provided with two bolt holes for bolting, and an engaging piece (vertical cross-sectional uneven shape) extending downward is formed between the bolt holes. On the other hand, two bolt holes for bolting are also provided in the rear part of the cushion frame, and an engaged hole that can be engaged with an engaging piece (vertical section convex portion) is formed between these bolt holes. Has been. Then, after temporarily engaging the engaging piece of the lower bracket with the engaged hole of the cushion frame, bolting the lower bracket to the cushion frame makes it possible to easily perform the bolting operation.
JP 2007-38852 A

However, the above-described technique has a problem that the structure for temporary fixing has to be formed on both the cushion frame and the lower bracket, which complicates the frame structure. Of course, the lower bracket may be bolted to the cushion frame while being supported by a separately provided support base, but this increases the number of parts required for the mounting operation.
The present invention has been made in view of the above points, and the problem to be solved by the present invention is to temporarily place a back frame on a cushion frame and fasten it using an existing frame configuration. It is in.

As a means for solving the above-mentioned problems, the back frame mounting structure of the present invention is such that the cushion frame is bridged between the pair of side frames forming the side skeleton and the rear of the pair of side frames. And a rear rod attached thereto.
Then, as a dimension setting that projects the rear rod outward from the pair of side frames, after attaching the rear rod to the pair of side frames, temporarily place the back frame on the projecting part of the rear rod (existing frame configuration) The back frame is fastened to the pair of side frames . At this time, in the present invention, the back frame is provided with a pair of fastening holes spaced apart from the front and back of the seat, and a concave portion disposed between the pair of fastening holes. Then, the back frame is swung while the rear rod is fitted in the concave portion, so that the pair of fastening holes can be aligned with the corresponding fastening holes of the cushion frame.
Therefore, in the present invention, the concave portion is formed as a concave curved surface opening larger than the diameter of the rear rod, and is formed at a position below the imaginary line connecting the pair of fastening holes.

  According to the present invention, the back frame can be temporarily placed and fastened to the cushion frame using the existing frame configuration.

The best mode for carrying out the present invention will be described below with reference to FIGS. In each of the drawings, reference numeral F is appropriately attached to the front side of the vehicle seat, and reference numeral B is appropriately attached to the rear side of the vehicle seat.
Referring to FIG. 1, the vehicle seat 2 of the present embodiment is configured such that the lower portion of the back frame 6F (the frame of the seat back 6) is connected to the rear portion of the cushion frame 4F (the frame of the seat cushion 4). More specifically, the back frame 6F is connected to a bracket 7 (detailed configuration will be described later) via a reclining mechanism 8. By fastening the bracket 7 to the cushion frame 4F, the back frame 6F is connected to the cushion frame 4F. Are connected in a tiltable manner.

In this embodiment, the bracket 7 is fixed to the back frame 6F in advance via the reclining mechanism 8, and then the bracket 7 is fastened to the rear portion of the cushion frame 4F. At this time, since the weight of the back frame 6F (bracket 7) is increased by the reclining mechanism 8 or the like, the fastening operation cannot be smoothly performed unless the back frame 6F is supported (temporarily placed) by some means. .
Therefore, in the present embodiment, the back frame 6F is temporarily placed at the time of fastening using the existing components (the rear rod 16 described later) of the cushion frame 4F. Hereinafter, each component will be described.

(Cushion frame)
Referring to FIG. 1, the cushion frame 4F of the present embodiment includes a pair of side frames 14 and 14 forming a side skeleton thereof, and reinforcing rod members (a front rod 12 and a rear rod 16 described later). Prepare.
And in a pair of side frames 14 and 14 rear part, a first insertion hole 40 for inserting the front rod 12 and a pair of first bolt holes 22 for bolting (fastening) a bracket 7 described later, 24 and a second insertion hole 46 for inserting the rear rod 16 is provided.
The pair of first bolt holes 22 and 24 are provided in the rear part of the side frame 14 so as to be separated from each other in the front-rear direction when viewed in the seat front-rear direction. A second insertion hole 46 is provided between the pair of first bolt holes 22 and 24. In the present embodiment, a second insertion hole 46 is provided at a position slightly below the imaginary line connecting the pair of first bolt holes 22, 24.

Referring to FIG. 2, the pair of side frames 14 and 14 are arranged to face each other with a predetermined separation dimension (cushion frame width dimension T1), and the front rod 12 is disposed on the front side of the seat (first insertion hole 40). Is inserted in a bridge shape and fixed by welding.
This front rod 12 (pipe shape) is set to a length dimension setting (T2) that can be bridged between the side frames 14 described above, and is almost outside the pair of side frames 14 and 14 when attached. It is a structure which does not protrude (however, a slight protrusion allowance may be provided).

(Rear rod)
Next, the rear rod 16 (pipe shape) is inserted and attached to each second insertion hole 46 provided in the rear part of the pair of side frames 14 and 14 in a bridging manner. The length T3 of the rear rod 16 is set longer than the width dimension T1 of the cushion frame 4F (the length dimension T2 of the front rod 12).
Then, the rear rod 16 is attached between the pair of side frames 14 and 14 in a bridging manner, and then fixed by welding so that both ends of the rear rod 16 protrude outward from each side frame 14, and a bracket 7 described later is attached. A supportable protruding portion 18 (protruding dimension T4) is formed.

(Back frame)
The back frame 6F of the present embodiment is a substantially rectangular frame body (detail drawing is omitted) with reference to FIG. 1, and the width dimension thereof is set substantially the same as the width dimension T1 of the cushion frame 4F described above. It is. Brackets 7 are fixed to the lower portions on both sides of the back frame 6F via reclining mechanisms 8, respectively.
The bracket 7 is a short, substantially rectangular flat plate member with reference to FIG. 4, and a reclining mechanism 8 is inserted into the bracket 7. A pair of second bolt holes 42 and 44 are provided in the lower part of the bracket 7 so as to be spaced apart in the front-rear direction of the seat, corresponding to the positions where the first bolt holes 22 and 24 are formed. A concave curved surface is formed (the concave portion 26 is formed).
The bracket 7 is disposed on the outer surface of the back frame 6F in a face-to-face manner. In this way, when fastened to a pair of side frames 14 and 14 described later, the inner surfaces of the brackets 7 and 7 fixed to the lower portions on both sides of the back frame 6F are the outer surfaces of the pair of side frames 14 and 14, respectively. Are arranged facing each other (see FIG. 1).

(Installation work)
3 and 4, the bracket 7 (back frame 6F) is attached to the rear portion of the cushion frame 4F. At this time, the bracket 7 is temporarily placed on the rear rod 16 of the cushion frame 4F so that the concave portion 26 below the bracket 7 is fitted into the protruding portion 18 of the rear rod 16.
The first bolt hole 22 (24) of the cushion frame 4F and the second bolt hole of the bracket 7 while rotating (swinging and positioning) the bracket 7 in the seat front-rear direction around the rear rod 16 (projecting portion 18). 42 (44) are overlapped. Then, the bracket 7 is fastened to the side frame 14 by inserting bolts (not shown) into the first bottle holes 22 (24) and the second bolt holes 42 (44) and fastening them.
As described above, according to the present embodiment, the back frame 6F is temporarily placed on the rear rod 16 (existing frame configuration) and is swing-positioned so that the back frame 6F can be easily and accurately positioned with respect to the cushion frame 4F. Can be concluded.
In addition, after the fastening operation, the cushion frame 4F is configured to support the back frame 6F at three points with two bolts and the rear rod 16, so that the fixing strength of both members is further increased.

Further, in a typical vehicle seat 2, with reference to FIG. 1, since the passenger's load is applied to the rear side, the strength of the rear rod 16 is set higher than that of the front rod 12. For this reason, when attaching the front rod 12 (for example, made by STKM11A) and the rear rod 16 (for example, made by STKM17A) to the pair of side frames 14, 14, it is necessary to be careful not to make a mistake in their mounting positions.
However, although the front rod 12 and the rear rod 16 have a slight difference in strength, both are substantially the same shape and the difference in weight is slight, so the rear rod 16 and the front rod 12 are attached at the time of mounting. There is concern that it will be mistaken.
At this time, in this embodiment, referring to FIG. 2, the rear rod 16 is longer than the front rod 12, so that the difference between the rear rod 16 and the front rod 12 can be seen at a glance. For this reason, according to the present embodiment, the pair of side frames 14 and 14 can be attached to their appropriate positions without changing the rear rod 16 and the front rod 12.

Although the protruding dimension of the rear rod 16 is emphasized in the drawing (for example, FIG. 2), the protruding part 18 may be dimensioned so that the bracket 7 can be placed temporarily stably. For example, referring to FIG. 3, the thickness dimension T5 of the typical bracket 7 is about 3 mm, and therefore the protrusion dimension T4 of the rear rod 16 in this case may be set to about 2 mm to 3 mm. With this protruding dimension setting, the bracket 7 can be temporarily placed stably without changing the appearance of the cushion frame 4F (without deteriorating the appearance).
Further, if there is a difference in length between the rear rod 16 and the front rod 12 of about 4 mm to 6 mm (a combined length of the two protruding portions 18 and 18), the difference between the two rods can be easily understood. For this reason, according to the present embodiment, the rear rod 16 and the front rod 12 can be attached to the pair of side frames 14 and 14 in an appropriate arrangement relationship without being mistaken.

The rod members (front rod 12 and rear rod 16) of the present embodiment are typically formed by cutting a long metal tube as a pipe material as a material with a pipe cutting machine such as a disk-shaped roll cutter. Manufactured with desired product dimensions.
For this reason, the rear rod 16 of the present embodiment can be easily manufactured simply by changing the cutting length in the rod manufacturing process that has been conventionally performed, and can be manufactured at low cost.

The frame structure of the present embodiment is not limited to the above-described example, and can take other various embodiments.
(1) In the present embodiment, the example in which the length of the rear rod 16 is increased to differentiate it from the front rod 12 has been described. At this time, a groove portion that runs in the rod length direction may be provided in the protruding portion 18 of the rear rod 16. By adopting such a configuration, the back frame 6F does not slide down with respect to the protruding portion 18 of the rear rod 16 (the groove becomes a non-slip) and can be temporarily placed. Further, the rear rod 16 provided with a groove (visually a kind of pattern) makes the difference between the front rod 12 and the front rod 12 more visually and sensuous, so that the rear rod 16 and the front rod 12 are preferably mixed. Is prevented or reduced.

(2) In the present embodiment, an example of bolting is described as an example of the fastening means. As the fastening means for the cushion frame 4F and the back frame 6F, other means (screw fixing, clip fixing, etc.) can be used as long as the mounting strength is secured.
(3) In this embodiment, the number of bolt holes (fastening holes) is set to two (a configuration that can support three points), but this is not intended to limit the number of bolt holes.
(4) In the present embodiment, the rod members (the front rod 12 and the rear rod 16) having a circular longitudinal section have been described as an example (an example in which the bracket 7 is swingably mounted). Each of these rod members only needs to be attached to the pair of side frames 14 and 14 in a bridging manner. For example, each rod member can be attached by swinging the bracket 7 if the rod member has a substantially circular shape such as an elliptical cross section other than a circular cross section. Further, when the rod is a polygonal rod such as a triangle in vertical section, the bracket 7 can be temporarily placed stably.
Further, in this embodiment, a hollow pipe-shaped rod member (an example that is light and easy to handle) is illustrated, but an intermediate rod-shaped rod member (an example in which the reinforcing performance is further enhanced) may be used.
(5) In the present embodiment, the back frame 6F is temporarily placed after the rear rod 16 is fixed by welding between the pair of side frames 14, 14. Unlike this, with the rear rod 16 inserted between the pair of side frames 14 and 14 (before welding is fixed), the back frame 6F is temporarily placed and fixed, and then the rear rod 16 is fixed by welding. May be.

It is a perspective view of a seat frame. It is a schematic upper front view of a cushion frame. It is a partial longitudinal cross-sectional view of a seat frame. It is a side view of a seat frame.

2 Vehicle seat 4F Cushion frame 6F Back frame 7 Bracket 8 Reclining mechanism 12 Front rod 14 Side frame 16 Rear rod 18 Projecting parts 22, 24 A pair of first bolt holes 26 A recessed part 40 A first insertion holes 42, 44 A pair of Second bolt hole 46 Second insertion hole

Claims (1)

In the mounting structure of the back frame that fastens and attaches the back frame to the cushion frame of the vehicle seat,
The cushion frame has a pair of side frames forming a side skeleton thereof, and a rear rod attached to them in a bridging manner at the rear of the pair of side frames,
After setting the rear rod to project outward from the pair of side frames, the back frame is temporarily placed on the projecting portion of the rear rod after being attached to the pair of side frames, and the back When fastening the frame to the pair of side frames ,
In the back frame, while providing a pair of fastening holes spaced apart in the front and rear of the seat, and a concave portion disposed between the pair of fastening holes,
The back rod is swung while the rear rod is fitted into the concave part, and the pair of fastening holes can be aligned with the corresponding fastening holes of the cushion frame, respectively.
A back frame mounting structure in which the concave portion is formed as a concave curved surface that opens larger than the diameter of the rear rod, and is formed at a position below a virtual line connecting the pair of fastening holes .

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