JP2021004020A - Headrest stay and method for manufacturing the same - Google Patents

Abstract

To provide a headrest stay and a method for manufacturing the same that can manufacture a headrest stay with superior performance at low cost.SOLUTION: A headrest stay 1 is formed of a metallic pipe and includes: an embedded part 2 embedded in a headrest body 10; and an insertion part 3 inserted into an insertion hole of a headrest support that is provided in an apex part of a seat back. A cover pipe 4 is fitted on an outside of each insertion part 3 on both sides.SELECTED DRAWING: Figure 1

Description

The present invention relates to a headrest stay which is a support member of a headrest mounted on the top of a seat back of an automobile seat, and a method for manufacturing the headrest stay.

A headrest is usually attached to the top of the seat back of an automobile seat, and the headrest is generally a headrest body including a pad formed of a foam material or the like, and is embedded in the headrest body so that both ends are projected. It is composed of a substantially U-shaped headrest stay (see, for example, Patent Document 1 below).

Japanese Unexamined Patent Publication No. 2004-114959

The headrest stay used for such a headrest is generally formed by bending a metal pipe in a substantially U-shape, and the metal pipe is chamfered at its end face and notched at a predetermined position. Furthermore, it is manufactured by applying a plating treatment such as nickel chrome plating to the outer peripheral surface for the purpose of rust prevention and decoration. A headrest body including a pad is formed on the headrest stay and attached to the headrest stay.

By the way, in the headrest stay, only the legs on both sides are exposed, and the upper part thereof enters the inside of the headrest body. Therefore, although the entire stay does not need to be plated, at least the exposed legs need to be plated. Become. In the plating treatment step, due to the structure of the device for suspending the headrest stays used there, a large number of headrest stays as a whole are immersed in a plating treatment tank at a time for plating treatment.

For this reason, in particular, when constructing a new headrest stay manufacturing plant, a plating jig and a hanging device used in the plating process, and plating equipment including a plurality of plating tanks are required, and the entire headrest stay is plated. Therefore, a large amount of plating solution containing nickel chrome is required, the cost of the plating process increases, and the manufacturing cost of the entire headrest stay increases.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a headrest stay and a method for manufacturing the headrest stay, which can manufacture a headrest stay having excellent performance at a low cost.

In order to achieve the above object, the headrest stay according to the present invention
A headrest stay formed of a metal pipe, having an embedded portion embedded in the headrest body and an insertion portion inserted into an insertion hole of a headrest support provided at the top of the seat back.
A cover pipe is fitted onto the insertion portion.
The cover pipe has an inner diameter that is tightly fitted to the outside of the insertion portion of the headrest stay, and has an outer diameter that can be inserted into the insertion hole of the headrest support, and has corrosion resistance and abrasion resistance. It is characterized in that a notch is formed at a predetermined position on the outer peripheral portion of the cover pipe in a state where the cover pipe is externally fitted to the insertion portion.

Further, the method for manufacturing the headrest stay according to the present invention is as follows.
It is a method of manufacturing a headrest stay formed of a metal pipe having an embedded portion embedded in the headrest body and an insertion portion inserted into an insertion hole of a headrest support provided at the top of the seat back.
A bending step of bending the metal pipe into a substantially U-shape to form the embedded portion in the middle portion and forming the linear insertion portion at both ends.
The process of fitting the cover pipe to the linear insertion part and
Including
The cover pipe has an inner diameter that is tightly fitted to the outside of the insertion portion of the headrest stay, and has an outer diameter that can be inserted into the insertion hole of the headrest support, and has corrosion resistance and abrasion resistance. Formed from metal with
After the cover pipe is fitted onto the insertion portion, a step of forming a notch at a predetermined position on the outer peripheral portion of the cover pipe is performed.

According to the present invention, since a metal cover pipe having corrosion resistance and abrasion resistance is externally fitted to the insertion portion of the stay exposed from the headrest main body, the plating treatment conventionally performed becomes unnecessary. This eliminates the need for plating processing equipment, eliminates the need for many plating steps including pretreatment and posttreatment of plating during manufacturing, and can significantly reduce the manufacturing cost of headrest stays.

In particular, when a new headrest stay manufacturing process is constructed in the factory, the plating equipment including the plating tank, plating jig, and hanging device used in the plating processing process, which was conventionally required, becomes unnecessary, and nickel, chrome, etc. Since the plating treatment liquid containing the high-cost plating metal material is not required, the manufacturing cost can be significantly reduced.

Further, when forming a notch in the insertion portion, if the cover pipe of the notch portion and the metal pipe portion of the stay are processed so as to be plastically deformed, the cover pipe can be easily fixed to the insertion portion only in that process. Can be done.

Here, it is preferable to use a stainless steel pipe as the cover pipe. According to this, the insertion portion exposed when the headrest is used is formed of stainless steel having excellent decorativeness, wear resistance, and corrosion resistance, and the commercial value of the headrest can be improved.

Further, here, after forming the notch, it is preferable to carry out round molding in which the tip of the insertion portion is pressed against the concave portion of the molding mold to form a roundness at the tip of the insertion portion.

Further, here, after the cover pipe is fitted onto the insertion portion to form a notch, the intermediate portion of the metal pipe can be bent into a substantially U shape to form an embedded portion. According to this, since the outer fitting of the cover pipe and the formation of the notch can be performed while the metal pipe is in a straight line state, the subsequent processing and semi-finished products are performed next to the case where the embedded portion is first bent. It can be easily handled when moving to the process.

According to the present invention, a headrest stay having excellent performance can be easily manufactured with fewer steps and man-hours, and the manufacturing cost can be reduced.

It is a front view of the headrest stay of one Embodiment of this invention. It is a right side view of the headrest stay. It is a partial cross-sectional view of the insertion part of a headrest stay. It is a partial cross-sectional view of the notched insertion part of a headrest stay. It is a VV sectional view of FIG. It is a VI-VI sectional view of FIG. It is a partially enlarged sectional view of the tip of the insertion part formed into a round shape. It is a front view of the manufactured headrest. It is a right side view of the manufactured headrest.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the headrest stay 1 includes a buried portion 2 embedded in the headrest main body 10 and an insertion portion 3 inserted into an insertion hole 12 of the headrest support 11 provided at the top of the seat back 13. Is formed with one metal pipe M as a base.

As shown in FIG. 1, the one straight metal pipe M serving as the base is bent in a substantially U shape in the middle portion in the bending process, and the ends on both sides of the metal pipe M are straight. It is left as a shape, and that portion becomes the insertion portion 3. A general-purpose steel pipe is used for the metal pipe M, but since the material is steel, when it is used without plating, the surface is corroded due to aging and the appearance is deteriorated.

In this headrest stay 1, as shown in FIGS. 3 and 4, cover pipes 4 having corrosion resistance, wear resistance, and decorativeness are externally fitted to the insertion portions 3 on both sides thereof, and the metal pipe M is plated. I'm omitting it. The cover pipe 4 is formed of a pipe having a good appearance and excellent corrosion resistance and abrasion resistance, for example, a stainless steel pipe. Further, the cover pipe 4 has an inner diameter that is tightly fitted to the outside of the insertion portion 3 of the headrest stay 1, and has an outer diameter that can be inserted into the insertion hole 12 of the headrest support 11 as shown in FIGS. have.

For example, as shown in FIG. 5, if the inner diameter R1 of the cover pipe 4 and the outer diameter R2 of the metal pipe M are substantially the same, or the inner diameter R1 of the cover pipe 4 is made larger by about 0.1 mm than the outer diameter R2 of the metal pipe M. Since the end faces of the cover pipe 4 and the metal pipe M are chamfered, the cover pipe 4 can be easily pushed into the insertion portions 3 at both ends of the metal pipe M from the axial direction without rattling.

Even if there is some rattling in the fitting of the cover pipe 4 and the metal pipe M, the notch 5 is finally formed on the outside of the insertion portion 3 to plastically deform the cover pipe 4 and the metal pipe M in a concave shape. Since the cover pipe 4 is formed, the rattling of the cover pipe 4 is eliminated by notch processing, and the metal pipe M is covered around the metal pipe M so that the cover pipe 4 can be fitted to the outside well.

In the process of assembling the cover pipe 4, the linear metal pipe M and the cover pipe 4 are held on the same axis using a predetermined jig, and the end portions of the cover pipe 4 and the insertion portion 3 are opposed to each other. , With a drive device using a fluid pressure cylinder or the like, the metal pipe M is press-fitted into the held cover pipe 4 so as to be pushed.

In the cover pipe assembling step, the cover pipe 4 is removed from the insertion portions 3 on both sides of the linear metal pipe M before the intermediate portion of the metal pipe M of the headrest stay 1 is bent into a substantially U shape. It is preferable to fit the metal pipe M from the viewpoint of workability, but the cover pipe 4 is attached to both ends of the linear metal pipe M which is the insertion portion 3 after the intermediate portion of the metal pipe M is bent into a substantially U shape. May be fitted externally.

After the cover pipe 4 is fitted onto the insertion portion 3, a notch 5 is formed at a predetermined position on the outer peripheral portion of the cover pipe 4. As shown in FIG. 4, the cover pipe 4 is plastically deformed to the metal pipe M side together with the metal pipe M by the processing of the notch 5, so that the cover pipe 4 is securely fixed to the metal pipe M. Can be done.

Next, a method of manufacturing the headrest stay having the above configuration will be specifically described.

For the metal pipe M serving as the base of the headrest stay 1, for example, a high-strength steel pipe having a wall thickness of about 1.5 to 2.0 mm and an outer diameter of about 10 to 13 mm is used, and the linear metal pipe M is a predetermined one. The burrs are cut to the length of the above, and the burrs at both ends are chamfered to remove them.

Next, a cover pipe 4 having a predetermined length is fitted onto the insertion portions 3 on both sides of the metal pipe M. A stainless steel pipe such as SUS304 is used for the cover pipe 4, and as shown in FIG. 5, the inner diameter R1 of the cover pipe 4 has substantially the same dimensions as the outer diameter R2 of the insertion portion 3 of the metal pipe M, or the inner diameter R1 is inserted. Make it about 0.1 mm larger than the outer diameter R2 of the part 3. As shown in FIGS. 8 and 9, the length of the cover pipe 4 is a length required for the support legs on both sides of the headrest main body 10, and the upper portion thereof is a length that slightly enters the inside of the headrest main body 10.

As the stainless steel pipe to be the cover pipe 4, a general-purpose pipe having a wall thickness of about 0.3 to about 1.5 mm can be used. In this case, for example, if the outer diameter of the metal pipe M is about 12 mm, the outer diameter of the cover pipe 4 may be about 12.3 to about 13.6 mm accordingly. The surface of the stainless steel pipe can be made into a decorative surface at low cost by a hairline finish or a polishing finish, and the stainless steel cover pipe 4 having a decorative surface has excellent decorativeness as it is.

The strength required for the headrest stay 1 is required for the insertion portion 3 which is the support leg of the headrest, but if the cover pipe 4 of the stainless steel pipe having rigidity is externally fitted to the insertion portion 3, the insertion portion 3 is used. The performance of the headrest stay 1 is improved because the strength of the headrest stay 1 is increased. On the other hand, when the strength of the insertion portion 3 is the same as that of the conventional one, the wall thickness of the metal pipe M can be made thinner than the wall thickness of the steel pipe conventionally used to reduce the weight of the stay. , The cost of the metal pipe M can also be reduced.

In the step of externally fitting the cover pipe 4 to the metal pipe M of the insertion portion 3, the insertion portion 3 of the metal pipe M and the cover pipe 4 are held on the same axis by using a predetermined jig. Then, with the end portions of the cover pipe 4 and the insertion portion 3 facing each other, the metal pipe M is moved and press-fitted into the held cover pipe 4 by a horizontal movement drive device using a fluid pressure cylinder or the like. To do.

The inner diameter tolerance of the stainless steel pipe and the outer diameter tolerance of the high tension pipe are usually about ± 0.15 mm, but the inner diameter R1 of the cover pipe 4 and the outer diameter R2 of the insertion portion 3 of the metal pipe M have the same dimensions or the inner diameter R1. If the outer diameter R2 of the insertion portion 3 is made larger by about 0.1 mm, the cover pipe 4 can be smoothly fitted into the insertion portion 3 without rattling by simply inserting the metal pipe M into the cover pipe 4 by pushing it. .. Further, since the linear cover pipe 4 is inserted into the linear metal pipe M and fitted externally, the workability is good and the cover pipe 4 can be easily fitted externally.

Next, a notch 5 of a groove-shaped recess is formed at a predetermined position of the cover pipe 4 fitted to the insertion portion 3. The notch 5 is formed as a locking portion when the insertion portion 3 of the headrest stay 1 is inserted into the insertion hole 12 of the headrest support 11 provided on the seat back 13 when the headrest is attached to the seat back 13. Then, it is formed at a predetermined position on the outer circumference of the cover pipe 4 by press working.

In the press working, a predetermined punch or press punch is pressed against a predetermined position on the outer peripheral portion of the cover pipe 4, and a part of the cover pipe 4 and the insertion portion 3 of the metal pipe M is plastically deformed and shown in FIGS. 1 and 4. The notch 5 is formed.

By forming the notch 5 of such a groove-shaped recess on the outer peripheral portion of the cover pipe 4 by plastic deformation, the cover pipe is formed even if there is a slight gap between the metal pipe M of the insertion portion 3 and the cover pipe 4. 4 can be easily fixed to the insertion portion 3 without rattling.

If the cover pipe 4 and the metal pipe M cannot be fixed by the notch 5, they can be fixed by welding or an adhesive.

Next, the cover pipe 4 is fitted externally and the tip of the insertion portion 3 is rounded. In this case, by pressing the tips of the insertion portions 3 on both sides into the recesses of the molding die, it is possible to easily perform round molding and form a roundness at the tips of the insertion portions 3.

Finally, the linear metal pipe M is subjected to a bending machine, and the intermediate portion of the metal pipe M is bent into a substantially U shape to form the buried portion 2. The bending machine accommodates, for example, a chuck portion provided with a mandrel shaft having a mandrel attached to the tip, a rotatable bending roll arranged on one side of the bending mandrel shaft, and a metal pipe M in the bending roll. It is composed of a clamp die that is formed with an arcuate concave portion that moves back and forth with respect to the other side of the mandrel shaft and is rotatably provided around the bending center, and a pressure die that moves the clamp die in the same direction. You can use the pipe bender that is used.

With such a bending machine, the headrest stay 1 has a front view as shown in FIG. 1 and a side view as shown in FIG. 2, that is, the middle portion is substantially U-shaped and both end portions are linear. It is bent into a shape to be the insertion portion 3.

After that, as shown in FIGS. 8 and 9, a headrest main body 10 including a pad formed of a foam material or the like is attached to the embedded portion 2 of the headrest stay 1, and a support leg is attached to the lower side of the headrest main body 10. The two insertion portions 3 are exposed. The cover pipe 4 externally fitted to the insertion portion 3 covers the entire insertion portion 3, and the two insertion portions 3 are inserted into the insertion holes 12 of the headrest support 11 provided on the seat back 13 of the vehicle or the like. Insert and the headrest is mounted on the seat back 13. The height position of the headrest main body 10 can be changed by locking the locking portion provided in the insertion hole 12 and the notch 5 of the insertion portion 3.

In this way, since the metal cover pipe 4 having corrosion resistance and abrasion resistance is externally fitted to the insertion portion 3 of the stay exposed from the headrest main body 10, the plating treatment conventionally performed becomes unnecessary. Therefore, the plating processing equipment becomes unnecessary, and many plating steps including the pretreatment and the posttreatment of plating are not required at the time of manufacturing, and the manufacturing cost of the headrest stay 1 can be significantly reduced.

In particular, when a new headrest stay manufacturing process is installed in the factory, the plating equipment including multiple plating tanks, plating jigs, and hanging devices used in the plating processing process, which was conventionally required, is no longer required. Since a plating treatment liquid containing a high-cost plating metal material such as chromium is not required, the manufacturing cost can be significantly reduced.

Further, when the notch 5 is formed in the insertion portion 3, the cover pipe 4 of the notch 5 and the metal pipe M of the stay are plastically deformed. Therefore, the cover pipe 4 is easily fixed to the insertion portion 3 only in that step. can do.

1 Headrest stay 2 Buried part 3 Insertion part 4 Cover pipe 5 Notch 10 Headrest body 11 Headrest support 12 Insertion hole 13 Seat back

Claims (6)

A headrest stay formed of a metal pipe, having an embedded portion embedded in the headrest body and an insertion portion inserted into an insertion hole of a headrest support provided at the top of the seat back.
A cover pipe is fitted onto the insertion portion.
The cover pipe has an inner diameter that is tightly fitted to the outside of the insertion portion of the headrest stay, and has an outer diameter that can be inserted into the insertion hole of the headrest support, and has corrosion resistance and abrasion resistance. A headrest stay which is formed of the metal and has a notch formed at a predetermined position on the outer peripheral portion of the cover pipe in a state where the cover pipe is fitted onto the insertion portion. It is a method of manufacturing a headrest stay formed of a metal pipe having an embedded portion embedded in the headrest body and an insertion portion inserted into an insertion hole of a headrest support provided at the top of the seat back.
A bending step of bending the metal pipe into a substantially U-shape to form the embedded portion in the middle portion and forming the linear insertion portion at both ends.
The process of fitting the cover pipe to the linear insertion part and
Including
The cover pipe has an inner diameter that is tightly fitted to the outside of the insertion portion of the headrest stay, and has an outer diameter that can be inserted into the insertion hole of the headrest support, and has corrosion resistance and abrasion resistance. Formed from metal with
A method for manufacturing a headrest stay, which comprises a step of forming a notch at a predetermined position on an outer peripheral portion of the cover pipe after the cover pipe is fitted onto the insertion portion. The headrest stay according to claim 1, wherein the cover pipe is a stainless steel pipe. The method for manufacturing a headrest stay according to claim 2, wherein the cover pipe is a stainless steel pipe. After the cover pipe is fitted onto the insertion portion to form the notch, the tip of the insertion portion is pressed into the recess of the molding mold to perform round molding, and the tip of the insertion portion is rounded. The method for manufacturing a headrest stay according to claim 2. The second aspect of claim 2, wherein the cover pipe is fitted onto the insertion portion to form the notch, and then the intermediate portion of the metal pipe is bent in a substantially U shape to form the embedded portion. How to manufacture the headrest stay.

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