JPS6361005B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frame structure for a reclining seat, etc., and in particular, an object of the present invention is to maintain a predetermined strength, reduce weight, and simplify the manufacturing process in a seat back frame made of a steel pipe frame. This relates to the seat back frame structure.

Conventionally, as shown in FIG. 1, the seatback frame of this type of steel pipe frame has been constructed by connecting a main frame 10 and a lower frame 11 by welding or the like, and forming a hinge part 12 by crushing one end of the main frame 10. or as shown in Fig. 2, steel pipes are bent and connected at the upper part with a connecting bracket 13, etc.
The hinge portion 14 generally has a structure in which a separate bracket is fixed by welding or the like.

However, in the former example above, the torsional strength of the connection between the main frame 10 and the lower frame 11 is weak, and in the latter example, although the torsional strength is sufficiently maintained, the number of processing steps such as welding and the number of parts increases. However, there were disadvantages such as high cost.

That is, in the seatback frame structure, among the four sides forming the frame, one side A to which the reclining device mounting bracket 15 is fixed, one side B of the lower frame 11 part, and two points a adjacent to one side A to which the bracket 15 is fixed, b is important in terms of strength, but in all of the above conventional examples, in order to obtain the rigidity of these important parts, the number of parts is large, such as extending the necessary material to other parts. This method not only increases weight but also requires a large number of welding steps, resulting in high costs.

This invention was made in order to improve the above-mentioned drawbacks of the conventional example, and in particular, a seat back frame made of a steel pipe frame, which maintains a predetermined strength and can be manufactured lightweight and inexpensively. It provides structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 3 and 4. FIG. 3 shows the structure of a seat back frame showing an embodiment of the present invention. Among the four sides of the frame 1, there is one side A to which the reclining device bracket 2, which is important in terms of strength, is fixed, and the side A adjacent to this side A. The area including both corners a and b is formed with a steel pipe 3 with a large diameter, and the other sides are formed with a steel pipe 4 with a small diameter. The steel pipe 3 with a large diameter and the steel pipe 4 with a small diameter are welded together at the upper side of the frame 1, and the lower end of the steel pipe 3 with a large diameter that forms the lower frame butts into the steel pipe 4 with a small diameter. Joined by patch welding.

Note that 5 in the figure is a hinge portion, which is formed by crushing the end portion of a steel pipe 4 having a small diameter.

FIG. 4 is a perspective view showing another embodiment of the present invention, in which the four sides of the frame 1 are made up of two steel pipes 4 formed into a small diameter steel pipe 4 and a steel pipe 3 formed into a large diameter U shape. It is formed by joining different types of steel pipes by butt welding, and in this case, preferably the butt positions are slightly shifted between the upper and lower sides. Further, the hinge portion 6 is formed by welding separately molded brackets.

As explained in detail below, in the seat back frame structure according to the present invention, of the four sides constituting the frame, an area including an important side in terms of strength and both corners adjacent to this side is bent using a steel pipe with a large diameter. However, the other sides are formed by forming two types of steel pipes with different diameters by butt welding, which reduces the number of bending steps per steel pipe and reduces the manufacturing equipment. It can be made smaller, uses fewer parts, and is lighter in weight. Further, the strength of the frame is sufficiently maintained and the processing process can be simplified, so that it can be manufactured at a low cost, which has industrial effects.

[Brief explanation of drawings]

1 and 2 are perspective views of a conventional seat back frame, FIG. 3 is a perspective view of a seat back frame according to the present invention, and FIG. 4 is a perspective view showing another embodiment of the present invention. It is. 1...Frame, 2...Bracket, 3...Large diameter steel pipe, 4...Small diameter steel pipe, 5...Hinge portion.

Claims (1)

[Claims] 1. In the seat back frame of the steel pipe frame, of the four sides composing the frame, the area that is important in terms of strength and the area including both corners adjacent to this side is formed with large diameter steel pipes, and the other sides are formed with large diameter steel pipes. A seatback frame structure characterized by being constructed by firmly joining two types of steel pipes with different diameters by butt welding, such as molded from small steel pipes.