JPS60106636A - Head rest stay of seat for automobile - Google Patents

Abstract

PURPOSE:To obtain a titled head rest stay easy to work and cheap by depressing both side edges of a material relatively to form a pair of escape parts, and forming plural engaging grooves for adjusting height on the peripheral face that does not form the escape parts by press work. CONSTITUTION:Both side edges of a round rod material are cut to groovelike form along longitudinal direction and the section of the material is made to special section of long lengthwise. Thus, both side edges are depressed relatively to form a pair of escape parts 2. Then, the material is set in a lower die 11 of a die provided with a projection 12 for forming an engaging groove 3 and a projection 13 for forming a groove 4 for stopper, and pressed by an upper die 14. Thus, grooves 3, 4 are formed by above-mentioned projections 12, 13. At the same time, excess metals 3a, 4a formed in above-mentioned escape parts. As upper and lower dies 14, 11 do not come into contact with the escape parts 2, no burr is formed along the boundary. In this way, a heat rest stray 1 of seat for an automobile provided with the engaging groove 3 and the groove 4 for stopper can be obtained by one process.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a headrest stay that supports a headrest in an automobile seat in a height-adjustable manner.

(Prior art) In a car seat in which the height of the headrest can be adjusted, a plurality of engagement grooves for height adjustment are provided in the stay that supports the headrest, and a plurality of engagement grooves are provided in the seat body. It is common to have a structure in which the headrest is held at a predetermined height by engaging a freely movable engagement piece with the engagement groove, but in the past, the engagement groove of this stay was formed by cutting into a round bar material. There were problems in that many of them were formed, which made processing troublesome and increased costs.

(Purpose and Structure of the Invention) The present invention has been made with an eye to the above-mentioned problems, and has been made for the purpose of providing a headrest stay in which the engagement groove can be easily machined. By doing this, a pair of relief portions are formed by making both side edges relative to each other, and a plurality of engagement grooves for height adjustment formed by press working are provided on the circumferential surface where the relief portions are not formed. It is characterized by In other words, machining is easy because it is a press machining process, and since the excess wall buildup occurs toward the relief part that has nothing to do with the sliding of the headrest, there is no need to cut it out, which reduces machining costs. It becomes possible.

Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

(Example) In Fig. 1 (a) (+]), 1 is a headrest stay made of a round bar material, 2 is a relief part, 3 is a height adjustment JI
Engagement groove J, 1 is the stubble Jlj groove. The relief part 2 is formed by cutting both side edges of the stay 1 in a groove shape along the longitudinal direction, and as shown in FIG. ing. The engagement groove 3 and the stopper groove 4 are formed in the part where the relief part 2 is not formed by pressing, and the excess thickness 3a, 4a produced by the press processing is formed in the relief part as shown in FIG. 1 (1). It is formed in 20 parts and does not protrude beyond the circular outer periphery of the material.

Figure 2 shows the usage state of the above stay 1. Since the lock for vertical adjustment is only required on one side, the headrest 5 is placed parallel to the stay 1a, which does not have an engagement groove, at the upper end.
is inserted into the upper end of the seat back 6 of the seat body. A pole guide 2 is provided inside this seat back, and the stays 1 and 1a are supported by this pole guide. A removable engagement piece J5 provided in the gear pack 6 engages to hold the headrest 5 at a predetermined height. 7 is a receiving seat for the stay 1 provided on the seat back 6, and the hole diameter is adapted to the circular outer circumference of the stay 1, but the extra thickness 3a, 4a of the stay 1 is outside the stay 1 as described above. Since it fits within the diameter, there is no effect on inserting or removing the stay 1 from the pole guide, and the excess thickness 3a after press processing
, 4a is not required.

FIGS. 3(a) and 3(b) show the mold used for press working and the procedure for press forming.The lower mold 11 of the mold includes a protrusion 12 for forming an engagement groove 3 and a stopper groove 4. The formation protrusion 13 is provided. These projections 12,13 may be of replaceable construction.

In the pressing process, as shown in FIG. 3(b), the cross section is set in a vertically elongated state so that the relief portions 2 are located on the left and right sides, and is set in the lower mold 11, and pressed by the upper mold 14. Incidentally, since the boundary line between the lower mold 11 and the upper mold 14 does not directly touch the moon, no flaws will occur along the boundary line.

As mentioned above, in the present invention, the relief part is formed by having a vertically elongated cross section with different diameters, but the relief part does not have to be a four-way groove as shown in FIG. For example, as shown in Figure 1 (a) l), both sides of a round bar material are cut flat to form a relief part 2, or as shown in Figure 5, an elliptical cross section is formed. It is also possible to form a relief part 2 in which the outer circumferential surface on the shorter diameter side is relatively larger than the outer circumferential surface on the longer diameter side, and this can be achieved by adopting an appropriate cross-sectional shape.

Further, the relief portion 2 may be formed partially as in the example of FIG. 1, or may be formed over the entire length as in the example of FIG. Of course, it is also possible to use a drawn outer material that has a relief part that allows excess material to escape when the material is pressed.

Since the headrest stay 1 according to the present invention has the engagement groove 3 formed with a considerable depth, the relief part 2 is provided to make the excess thickness in this part, but if the press is small, the relief part is generally not necessary.

That is, FIG. 6 shows a modification of FIG. 1 (1), in which excess material during molding is released as small protrusions on both sides, and can be used as is or with these protrusions removed in advance.

(Effects of the Invention) As described above, in the present invention, the engagement groove for height adjustment is formed by press working, and the removal work of the raised part of the excess thickness is required in step (A). You can get a cheap Radrest stay.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are a perspective view and a sectional view taken along line A-A of an embodiment of the present invention, Figure 2 is a perspective view of an automobile seat using the stay of the present invention, and Figure 3 (a). ) (l]) is a perspective view of the mold and an explanatory diagram of the press molding procedure, Fig. 4 (a) (+1
> is a perspective view of another embodiment and a sectional view taken along the line B-[, FIG. 5 is a sectional view of another embodiment, and FIG. 6 is a sectional view showing a modification of FIG. 1(b). 1...Headrest stay, 2...Escape part, 3...
・Engagement groove.

Claims (1)

[Claims] (1) By making the cross section of the material into a vertically elongated cross-section with different diameters, a pair of relief parts were formed by making both side edges relatively four-dimensional, and this was formed by press working on the circumferential surface where the relief parts were not formed. A headrest stay for an automobile seat that is provided with a plurality of engagement grooves for height adjustment.