JPH0140604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a seat back frame, and more specifically, the present invention relates to a seat back frame that is formed by bending a pipe to form a substantially square shape, and joining both ends of this pipe to form a closed ring shape. Regarding frames.

Conventionally, as shown in FIGS. 1A and 1B, a seatback frame used for a seat of a vehicle, etc. has a pipe 1 bent into a substantially rectangular shape, and both ends 1a and 1b of the pipe 1 are butted together and a circular plate electrode is formed. The seat back frame 2 is formed into a closed annular seat back frame 2 by being sewn together using resistance welding, or by fitting the connecting members 3 to both ends 1a and 1b of the pipe 1 and butting them together, and then attaching the connecting members 3 by arc welding.
The seat back frame 2 is joined together to form a closed ring.
In many cases, the welding work along the circumferential surface of the pipe 1 is complicated and the work efficiency is poor.
In addition, in the case of joining by welding, variations in strength tend to occur, which has the disadvantage that a seat back frame 2 with stable strength cannot be obtained, and furthermore, there is a risk of bending or breaking when an impact is applied to the welded part. It had this.

The purpose of the present invention is to be able to firmly join both ends of pipes without welding, to facilitate the joining work and improve work efficiency, and to maintain stable strength and prevent the joint from being subjected to impact. This will become clear from the detailed description below with reference to the drawings.

2 and 3A and 3B schematically show a first embodiment of the seat back frame according to the present invention, and this seat back frame 11 is constructed by bending a long pipe 12, etc. The pipe 12 is formed into a substantially rectangular shape, and a constricted portion 13 is formed at one end 12a of the pipe 12.
The other end portion 12b is fitted into the inner circumferential surface of the other end portion 12b to form a closed ring shape. The fitting length L of the fitting part 14 between the one end 12a and the other end 12b of the pipe 12 can be set to an appropriate length, but the fitting state is maintained when receiving a pressing force from the radial direction. It is preferable to form it as relatively long as possible.

As shown in FIGS. 3A and 3B, a recess 15 is formed at approximately the central front side of the fitting portion 14 of the pipe 12 by caulking, and the fitting state is maintained.
2a and the other end 12b are prevented from coming apart. Further, this fitting portion 14 is formed approximately at the center of the upper horizontal rod portion 11A of the seatback frame 11, and a cylindrical receiving portion 17 into which a pair of headrest stays are inserted is provided on both sides of this fitting portion 14. They are fixed by pair welding, etc. A pair of recesses 18 are previously formed by caulking at the positions where the receiving portions 17 are fixed. Since the pair of recesses 18 are similarly formed on the front side of the upper horizontal rod portion 11A, when forming the recesses 18, the recess 15 of the fitting portion 14 can be formed at the same time.

In the above embodiment, the fitting part 14 is provided approximately at the center of the upper horizontal rod part 11A, and a pair of headrest stay receiving parts 17 are formed on the left and right sides. When providing one piece at the center of the upper horizontal rod portion 11A, the recess 18 formed at the fixed position of the receiving portion 17
The recess 15 of the fitting part 14 can also be used, and when a pair of receiving parts 17 is formed on the left and right,
If the fitting part 14 is formed at the fixed position of either the left or right receiving part 17, the recesses 15 and 1
8 can be used for either one.

FIG. 4 schematically shows a second embodiment of the seat back frame according to the present invention, and parts corresponding to those in the first embodiment are given the same reference numerals, and further detailed explanation thereof will be omitted. However, the constricted part 13 is not formed at the one end 12a of the pipe 12, and the pipe 1
Both ends of the connecting member 21 are fitted in contact with the inner peripheral surfaces of both ends 12a and 12b of the pipe 1.
Recesses 25 are formed by caulking in the fitting parts 23 and 24 between the ends 12a and 12b of 2 and the connecting member 21.
The structure is similar to that of the first embodiment described above except that 26 and 26 are formed respectively.

In such a configuration, either one of the recesses 18 formed in the receiving portion 17 of the headrest stay and the recesses 25 and 26 of the fitting portions 23 and 24 can be used in the same manner as described above.

FIGS. 5A and 5B show a recess 15 formed in the fitting part 14 of the seat back frame 11 according to the present invention.
Different embodiments of the fitting portion 14 are shown.
The recess 15 is formed along the longitudinal direction of the upper horizontal rod portion 11A, as shown by arrow a in FIG. 5B. A seat back frame 11 that is strong against impact forces from the direction of the outer periphery of the fitting portion 14 can be obtained.

The above is the configuration of an embodiment of the seat back frame according to the present invention. With this configuration, both ends of the pipe are not joined by welding, so it is possible to improve work efficiency, and the crimping process It is possible to select various strengths of the fitting part depending on the shape of the recess, and to obtain a seat frame with uniform strength.Furthermore, the fitting part has a double structure, which improves the strength against impact, and further improves the strength of the headrest stay. By setting the fitting portion at the fixed position of the receiving portion to be inserted, the recess at the fixed position of the receiving portion and the recessed portion of the fitting portion can be used both, and work efficiency can be further improved.

[Brief explanation of drawings]

FIGS. 1A and 1B are partial cross-sectional explanatory views of a conventional seatback frame, and FIGS. 2 and 3A and 3B schematically show a first embodiment of the seatback frame according to the present invention. Figure 2 is a partially cross-sectional explanatory diagram showing a state in which the pipe is bent to form a closed ring shape, Figure 3A is a perspective view of the upper horizontal rod of the seat back frame, and Figure 3B is a horizontal view of the upper horizontal rod. 4 is an explanatory cross-sectional view, and FIG.
Figures A and B show modified examples of the recess formed in the fitting part. Figure 5A is a partial perspective view of the upper horizontal rod part, and Figure 5B is taken along the line BB in Figure 5A. FIG. In the figure, 11... Seat back frame, 11A
... Upper horizontal rod part, 12 ... Pipe, 12a, 1
2b... Both ends of the pipe, 14, 23, 24...
Fitting portion, 15, 25, 26... recess, 17... head rest stay receiving portion, 18... recess, 21...
...Connection member.

Claims (1)

[Claims] 1 Bend the pipe to form a roughly square shape,
In a seatback frame formed by joining both ends of the pipe to form a closed ring, a fitting part in which one end of the pipe fits into the other end is formed in an upper horizontal rod part of the seatback frame, A recessed portion to which a receiving portion of a head rest stay is fixed is formed on the front side of the upper horizontal rod portion, and the fitting portion is fixed on the same front side of the fitting portion as the side on which the recessed portion is formed. A seatback frame characterized in that a concave portion for preventing rotation is formed by caulking.