JPS6244693Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat back frame for an automobile, and more particularly to a seat back frame having sufficient strength against rearward moment when the seat back is rested.

As shown in Fig. 1A, the conventional seatback frame is made by abutting both ends of an arm 4 against both side frames 2 and 3 of a pipe frame 1 bent in a U-shape, and welding both ends around the entire circumference. Alternatively, as shown in FIG. Not only was it inferior, but its strength was also weak. Therefore, in order to improve productivity and strength, a seatback frame was devised in which two pipes with different cross-section diameters were bent into a U-shape, and the smaller diameter pipe was inserted into the larger diameter pipe. It was done. When this seat back frame 10 is shown in FIG. 2, 11 is a main member made of a small diameter pipe bent into a U-shape.
Reference numeral 12 is a lower member in which a pipe having an inner diameter larger than the outer diameter of the main member is similarly bent into a U-shape, and both ends of the main member 11 are inserted into both ends of the lower member 12. The seat back frame 10 has a rectangular shape, and a bracket 14 having a rotating hinge 13 and a bracket 15 for attaching a reclining device are attached to both sides of the seat back frame 10. Beads 14a, 14b and 15a, 15b in contact with the outer surfaces of the main member 11 and lower member 12 are cut and raised on both the brackets 14 and 15, and each bead 14a, 14b,
15a, 15b and each member 11, 12 are welded to form the main member 11 and lower member 12.
The bracket 14 is positioned relative to the bracket 14,
15 was fixed. This eliminates the need for welding the entire circumference, making it possible to improve productivity and strength.
When a load is applied in the direction of arrow A in FIG. or the main member 11 is bent.
It was not possible to obtain sufficient rearward moment strength.

The present invention increases the rear moment strength of a seatback frame formed by bending pipes with different diameter cross sections into a U-shape and inserting both ends of one pipe into both ends of the other pipe. The pipe was bent into a U-shape, and the tip of the small-diameter main member, which was also bent into a U-shape, was inserted into the tip of the large-diameter lower member, which was made by bending the pipe into a U-shape. In the seatback frame, the seatback frame is formed into a shape, and brackets are provided on both side portions of these members, and beads are formed on the brackets to be welded to each member. A connecting bead is cut and raised from the bracket, and the connecting bead and each member are welded.

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIG.

In addition, in this figure, the same parts as in FIG. 2 are given the same reference numerals, and the details are omitted.

In FIG. 3, the bracket 14 on which the rotating hinge 13 is formed and the reclining device mounting bracket 15 have at least two beads 14a, 14b and 15a, 15b in contact with the main member 11 and the lower member 12, respectively. The upper and lower beads 14b and 15b are welded to the main member 11, and the lower beads 14a and 15a are welded to the lower member 12.
And in these brackets 14 and 15,
Furthermore, both ends of the main member 11 are connected to the lower member 1.
Connecting beads 21 and 22 are cut and raised, respectively, and are in contact with the joint portion inserted into both ends of the main member 11 and the lower member 12. As a result, main member 11
The joints are securely fixed and do not easily rotate. Therefore, even if a backward moment that causes the main member 11 to fall backward occurs, the main member 11 will not rotate at the joint portion, and the main member 11 will not bend or become detached from the lower member 12. This greatly increases the rearward moment strength of the seat back frame.

As described above, according to the present invention, the U-shaped main member is inserted into both ends of the U-shaped lower member, and the brackets with raised beads are welded to each member, simplifying the manufacturing process. Not only does this improve productivity, but the bead is cut up and welded to the joint between the main member and lower member, increasing the strength against rearward moments and preventing the seat back frame from bending. Practical effects can be achieved in that it does not run dry or decompose and has improved durability.

[Brief explanation of the drawing]

FIGS. 1A and 2B are perspective views of conventional examples, and FIG. 3 is a perspective view of an embodiment of the present invention. 11... Main member, 12... Lower member,
14, 15...Bracket, 14a, 14b, 1
5a, 15b...Bead, 21, 22...Connection bead.

Claims (1)

[Scope of utility model registration request] The tip of a small-diameter main member, which is also bent in a U-shape, is inserted into the tip of a large-diameter lower member, which is a pipe bent in a U-shape, to form a square shape. In a seat back frame in which brackets are provided on both sides of the member, and beads are formed on the brackets to be welded to each member, a connecting bead is cut and raised from the bracket at the joint between the lower member and the main member. and the connecting bead and each member are welded.