JPH0240837Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement of an endlessly connected back frame in an automobile seat.

A conventional back frame for a general vehicle seat is constructed by welding both ends of a bar 2 to the lower end of a U-shaped member 1 by welding 3, 4 to the lower end of a U-shaped member 1, as shown in the first conventional example shown in FIG. Alternatively, as in the conventional example shown in FIG. 2, a single tube material 5 is bent, and both ends are butt welded 6 to form an endless shape.

However, in the case of the conventional example shown in Fig. 1, the bar 2
It is necessary to assemble the two ends by welding 3 and 4 at two places, which requires many assembly steps and takes time to manufacture.In addition, in the conventional example shown in Fig. 2, the parts are butt-welded compared to other parts. Since the strength of No. 6 was low, the stress of torsion and lateral load was concentrated there, which caused the problem of failure.

On the other hand, a back frame in which a single pipe is bent into a quadrilateral shape and its opposite end openings are integrally joined to form an endless back frame is disclosed in Japanese Utility Model Publication No. 56-33400.

When using this pipe, a reinforcing member such as a core is inserted into the joint, and the openings at both ends are butt welded to improve the rigidity of the part to which the reclining device is attached. As a result, inserting the core and butt welding the pipes were required, resulting in problems that greatly reduced workability.

Therefore, an object of the present invention is to provide a back frame with improved rigidity without inserting a reinforcing member such as a core into the pipe or without butt welding.

The seat back frame according to the present invention to achieve such an object is a seat back frame which is formed by bending a single hollow member into a quadrilateral shape and connecting both opposing end openings to form an endless shape. An insertion part is provided at one end of the above-mentioned both end openings, and the insertion part is press-fitted so that the entire outer peripheral surface is in contact with the inner peripheral surface of the other end opening, and the insertion part has a diameter that is approximately equal to the inner diameter of the other end opening. The insertion part is formed by compressing the outer diameter to the extent that the insertion part is fitted to the other end opening to form a joint part, and a bracket or free hinge support plate for installing a reclining device is attached to the joint part and both upper and lower sides of the joint part. It is made by fixing.

That is, the present invention allows the insertion part provided at one end of the hollow material to function as a connecting member and a reinforcing member, thereby increasing rigidity without using a reinforcing member such as the core. In addition to improving workability by eliminating the need for butt welding. Moreover, since the outside diameter of the joint is the same as the outside diameter of the hollow member, when the joint and both sides above and below it are fixed to a reclining device mounting bracket or free hinge support plate, the joint and both sides above and below it It can be securely attached to a bracket, etc., with no step between the two. The joint portion is further reinforced by fixing the brackets and the like.

Hereinafter, embodiments of this invention will be described based on FIGS. 3 to 11.

This idea involves bending and joining a single hollow piece of material.
It constitutes an endless back frame 10, and in the example shown in FIG. The portion 11 is reinforced by fixing a bracket 12 for mounting the reclining device and a reclining device 13 to the back frame 10.

Further, in the example shown in FIG. 4, the joint portion 11 is set at a position where the free hinge support plate 14 is attached, and the joint portion 11 is reinforced with the free hinge support plate 14 attached to the back frame 10.

Next, various embodiments of this joint portion will be described.

The first embodiment shown in FIG.
0, the other end opening 21 is drawn to a required length and has an outer diameter that is approximately equal to the inner diameter of the one end opening 20 to form an insertion part 22, which is inserted into the other end opening 20. The insertion part 22 is drawn so that it matches and fits into the inner circumferential surface of the opening 20 at one end, so when the openings at both ends are connected, the insertion part 22 fits into the inner circumferential surface of the opening 20 at one end. On the other hand, the joint portion 11 is press-fitted so as to abut over the entire circumferential surface, thereby forming a joint portion 11 strong enough to withstand loads in the front-rear direction. The joint portion 11 of the first embodiment shown in FIG. 5 is located on the side of the frame 10 as shown in FIG. By welding the bracket 12 or the free hinge support plate 14, it is possible to sufficiently resist torsional and longitudinal forces.

In the second embodiment shown in FIG. 6, the connecting portion 11 is formed so as to be able to resist stress in the torsional direction and the longitudinal direction without using the above-mentioned bracket 12. Partial welding 23 is performed between the leading end edge 25 of 20 and the constriction step 24 of the other end opening 21 to secure the two end openings 20 and 21 together.

In addition, when performing this partial welding, the one end opening 20 and the other end opening 21 are press-fitted, and the tip edge 25 of the one end opening 20 is connected to the stepped part 24 of the other end opening 21.
The welding work is easy because it is locked and positioned.

In the third embodiment shown in FIG. 7, a drawn step portion 24 of the insertion portion 22 of the other end portion 21 is drawn to match the inside of the one end portion 20 of the back frame.
One end opening 20 is provided with a constricted part 26 and the insertion part 22 of the other end opening 21 is fitted into one end opening 20.
Press-fit the circumference of the distal end of the constriction part 2 of the insertion part 22.
6 and are fixedly connected by caulking 27.

In this way, in the third embodiment shown in FIG. 7, both ends are fitted and connected, so it is resistant to lateral loads, and the peripheral edge of the tip of the opening at one end is caulked and is engaged with the recess. Since the frictional force of caulking is strong, it is configured to be able to sufficiently withstand forces in the torsional and longitudinal directions.

The fourth embodiment shown in FIGS. 8 and 9 is different from the first embodiment shown in FIG.
A blank 28 as shown in FIG.

That is, an oval blank 28 is punched in advance at one end opening 20, and this one end opening 20
The blank 28 and the surface of the insertion part 22 are welded 29 to securely connect the blank 28 and the surface of the insertion part 22 with the inserted part 22 of the other end opening 21 which has been drawn into the drawn part 24 up to the position where it hits the stepped part 24.

In this way, the one end opening 20 and the other end opening 21 are press-fitted and welded 29 through the blank 28, so that they can withstand torsion and longitudinal loads as in the previous embodiments. It has sufficient strength.

Furthermore, a fifth embodiment shown in FIGS. 10 and 11 will be described.

In the case of this fifth embodiment, the insertion portion 22 at the other end of the back frame, which is drawn to match the inside of the opening 20 at one end of the back frame, is press-fitted, for example, as shown in FIG. In the embodiment shown in FIG.
1 to form a crushed portion 30 and join.

Alternatively, as shown in the figure, a crushed portion 30a is formed in advance at one end opening 20 of the back frame, and the insertion portion 22 having a crushed portion 30b formed thereon is press-fitted thereto to match the crushed cross-sectional shape. , may be combined.

When connected in this way, since it is supported by the insertion part and its flattened surface, it has sufficient strength against torsion and lateral loads, as in the previous embodiment.

According to the present invention, the insertion part provided at one side opening is press-fitted into the other side opening to form an endless connection, eliminating the need for butt welding as in the conventional products. This improves the workability of the joining process.

In addition, since the insertion part has the function of a reinforcing member,
There is no need to press fit reinforcing members such as cores into the hollow material. Therefore, the weight of the frame can be reduced and workability is further improved.

Furthermore, the insertion part provided at the one end opening is formed by compressing the outer diameter to a diameter that is approximately equal to the inner diameter of the other end opening, and the insertion part is press-fitted into the other end opening to form a joint. Because of this, when fixing a bracket for installing a reclining device or a free hinge support plate to this joint and the upper or lower side of this joint, it can be securely welded and fixed, and by fixing this bracket, etc. , the strength of the joint is further improved and has sufficient strength against torsion and lateral loads applied to the joint.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the back frame of a conventional vehicle seat, FIGS. 3 and 4 are exploded perspective views illustrating the back frame of the seat of this invention, and FIG. 5 is a perspective view of the back frame of the seat of the present invention. FIG. 6 is an enlarged partial sectional view showing the first embodiment of the joint, FIG. 7 is an enlarged partial front view showing the second embodiment, and FIG.
8 is an enlarged partial sectional view showing the fourth embodiment, FIG. 9 is an enlarged sectional view taken along the line of FIG. 8, and FIG. 10 is an enlarged partial sectional view showing the fifth embodiment. A partial perspective view, and FIG. 11 is a cross-sectional view taken along the - line. In the figure, 10 is a frame, 20 is an opening at one end of the back frame, 21 is an opening at the other end of the back frame,
22 is an insertion section.

Claims (1)

[Scope of Claim for Utility Model Registration] In a seat buckle frame formed by bending a hollow member into a quadrilateral shape and joining opposing end openings to form an endless shape, , an insertion part is provided that is press-fitted so that the entire outer peripheral surface is in contact with the inner peripheral surface of the other end opening, and the insertion part is formed by compressing the outer diameter to a diameter that is approximately equal to the inner diameter of the other end opening. , the insertion part is fitted into the other end opening to form a joint part, and a bracket or a free hinge support plate for mounting the reclining device is fixed across the joint part and both upper and lower sides of the joint part. back frame of the seat.