JP2002011524A - Method and apparatus for notching head rest stay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive improvement of a working precision and reduction of a forming cost, etc., of a notch by using a bar like support member freely insertable through a tip opening part of one leg part of a stay in a head rest stay. SOLUTION: It is on a premise to use a first support member 40, which is freely insertable into a tubular stay leg part 14 and forms a support face 47 to support a stay inner wall protrusion part 14b formed by forming a notch 15 on an outer face, and a second support member 50, which is insertable into the stay leg part 14. Before the notch 15 is formed by a pressing protrusion piece 32, after the first support member 40 is inserted into the stay leg part 14, the second support member 50 is inserted. After the notch 15 is formed, at the beginning the second support 50 is pulled out, next the first support member 40 is pulled out while avoiding interference with a stay inner wall protrusion part 14b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a notch for forming a notch for adjusting a height position with respect to a seat back stepwise on a stay leg of a headrest stay formed by bending a pipe material by forcibly pressing a pressing protruding piece. The present invention relates to a forming apparatus and a notch forming method performed using the notch forming apparatus.

[0002]

2. Description of the Related Art For example, an occupant seat is installed in a passenger compartment of a passenger car or the like. A headrest for protecting a head of an occupant sitting on the seat is mounted on an upper portion of a seat back of the seat. As shown in FIG. 13, the headrest is composed of a main body 11 molded from urethane foam or the like and covered with a skin material, and a headrest stay 12 formed by bending a metal pipe material into a substantially U-shape. Headrest stay 12
Are fixed to the main body 11 with the stay leg portions 13 and 14 on both sides protruding from the main body 11. The headrest 10 is attached to the seatback 20 by inserting the stay legs 13, 14 of the headrest stay 12 into the support holes 21, 21 provided in the seatback 20. I have.

[0003] The headrest 10 has a physique of an occupant.
The height position with respect to the seat back 20 can be adjusted stepwise according to the (seat height), so that the position can be adjusted to an optimum position for the occupant. That is, as shown in FIG. 13, a plurality of notches 15 are recessed at appropriate intervals in one stay leg 14 of the headrest stay 12, and an entrance of the support hole 21 of the seatback 20 is Each of the notches 15 is provided with a detachable slide lever 22.
And the respective notches 15 engage with each other so that the headrest 1
The zero height position is adjusted.

The headrest stay 12 is generally formed by bending a solid rod-shaped material. However, recently, the headrest stay 12 has been changed to a bent rod-shaped material (metal pipe material). It is getting. This is because, when comparing a solid rod-shaped material and a pipe material with the same outer diameter, the pipe material is more advantageous in weight reduction and material cost reduction. A headrest stay 12 formed by bending such a pipe material
In the related art, the notch 15 is formed by cutting the outer surface of the stay leg 14 using a cutting technique such as milling with a milling cutter or broaching with a broach. However, when the notches 15 are formed by shaving the headrest stays 12, each of the notches 15 must be individually processed. Therefore, when a plurality of notches 15 are formed, the cutting operation takes time. There are various problems, such as a reduction in rigidity, which is likely to cause deformation, and a need for a post-operation to remove "burrs" formed during the cutting process, because the portion formed with No. 15 is thin.

[0005]

Therefore, instead of the cutting, the stay leg 14 is plastically deformed into a concave shape or partially cut (split) by utilizing a press working technique by forcibly pressing a pressing projection. A method of forming the notch 15 by cutting the notch 15 has also been proposed. However, when the notch 15 is formed by forcibly pressing the pressing protruding piece, the head leg stay 12 is a hollow pipe material.
However, there is a problem that not only the notch 15 having an appropriate shape cannot be formed, but also the processing accuracy varies depending on the wall thickness and material of the pipe material. Also, when partial cutting is performed by pressing protruding pieces,
The stay leg portion 14 is entirely deformed, and the cut surface of the cut portion is very rough and has burrs and the like.

In view of this, a separately formed support member or the like is inserted in advance into the inside of the stay leg portion 14 corresponding to the notch forming portion, and the pressing protruding piece is forcibly pressed under this condition. Thus, a proposal has been made to prevent the stay legs 14 from being entirely deformed by the support material. However, in such a molding method,
Even if the deformation of the stay leg 14 can be prevented, the notch 1
Because the support member is interfered with the stay inner wall projection that is deformed inward and protrudes due to the molding of 5, the support member cannot be taken out, and the support member is prepared for each headrest stay 12. However, there is a disadvantage that the manufacturing cost of the headrest stay 12 is increased. In addition, it is difficult to accurately position the support material with respect to the stay leg portion 14, and when the pressing protruding member is forcibly pressed in a state where it is not accurately positioned,
There is also a problem that the notch 15 itself is not properly formed.
Further, it is possible to point out that the weight of the headrest stay is increased by the weight of the support material.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problem suitably, and utilizes a rod-shaped support member which can be inserted and removed through an opening at the end of a stay leg of a headrest stay. It is an object of the present invention to provide a notch forming apparatus and a notch forming method for a headrest stay that can improve notch processing accuracy and reduce forming cost.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems and to achieve the intended object, the present invention relates to a headrest stay formed by bending a pipe material, and the height of the headrest stay and the seat back are adjusted. In a notch forming apparatus in which a notch to be adjusted stepwise is formed by forcibly pressing a pressing protruding piece, the notch can be slid on the same axis as the stay leg, and the stay is inserted through an opening at the tip of the leg. A rod-shaped first support member that can be inserted into and detached from the leg portion; and a rod-like first support member that is slidable on the same axis as the stay leg portion and is disposed adjacent to the first support member. A second support member in the form of a rod which can be inserted into and removed from the stay leg via the opening, and formed on the outer surface of the first support member, by forming a notch in the stay leg. Inside Supporting the stay inside wall projection to deform to protrude from the inside consists of a concave support surface, the stay leg the after inserting the first support member to the part second
By inserting the support member, the first support member is fixed and held in a state where the support surface is directed toward the pressing protruding piece, and after completion of the formation of the notch, the second support member is removed from the stay leg. , Whereby the first support member can be pulled out while avoiding interference with the stay inner wall projection.

[0009] In order to solve the above-mentioned problems and to achieve the intended object, the present invention adjusts the height position of the headrest stay, which is formed by bending a pipe material, with the seat back in a stepwise manner. In the notch forming method in which the notch is formed by forcibly pressing the pressing protrusion, the notch can be slid on the same axis as the stay leg and can be inserted into and removed from the stay leg, and A first support member having, on its outer surface, a support surface capable of supporting a stay inner wall protrusion that is deformed inward by forming a notch;
A rod-like member that is also slidable on the same axis as the stay leg and is disposed adjacent to the first support member, and that can be inserted into and removed from the stay leg with the first support member inserted into the stay leg. Assuming that the second support member is used, prior to the formation of the notch by the pressing protrusion, the second support member is inserted after the first support member is inserted into the stay leg, The first support member is fixed and held in a state where the support surface is directed toward the pressing protruding piece, and then the pressing protruding piece is forcibly pressed against the stay leg, and the tip of the pressing protruding piece is formed. The notch is formed by the support surface of the first support member, and after the formation of the notch is completed, the second support member is pulled out from the stay leg, and then the interference with the stay inner wall protrusion is avoided. Characterized in that so as to pull out the first support member.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a notch forming apparatus and a notch forming method for a headrest stay according to the present invention will be described.
Preferred embodiments will be described below with reference to the accompanying drawings.

First, the notch forming apparatus of the present embodiment will be schematically described. 3 and 4 are a plan view and a side view of a main part of a notch forming apparatus used for suitably executing the notch forming method of the embodiment. The notch forming device 25 can set and hold the headrest stay 12, which is formed by bending a pipe material in a substantially U-shape, in a substantially horizontal position by each jig 27 provided on the upper surface of the table 26. I have. In each of the stay legs 13, 14 of the headrest stay 12, near the stay leg 14 (the lower side in FIG. 3) where the notch 15 is formed, the stay leg 1 is located.
4 is provided with a notch forming portion 28 for forming the notch 15 and a support portion 29 for supporting the stay leg portion 14 from the inside.

[0012] The notch forming portion 28 is shown in FIGS.
As shown in FIG. 2, a first support 30 supporting substantially half of the outer peripheral surface of the stay leg 14, a second support 31 supporting the remaining half of the outer peripheral surface of the stay leg 14, (2) A plurality of (four in the embodiment) pressing projections 32 slidably supported by the support 31, and the second support 31 and the pressing projections 32 are urged toward the stay leg 14 side. And a biasing member 33 for performing the operation. The respective pressing projections 32 are for simultaneously forming four notches 15 with respect to the stay leg 14, and the second support 3
The base member 3 is slidably fitted in each of the support holes 34 formed in the first support member 1 and connected to the second support body 31 by slide pins 35, 35 fitted with springs 36.
7 is end-supported. In addition, a second inclined surface 37a is formed in the rear portion of the base material 37 so that the first inclined surface 33a formed on the urging member 33 contacts the second inclined surface 37a.

In the notch forming portion 28 having the above-described structure, the biasing member 33 is moved by biasing means (not shown) while the stay leg 14 of the headrest stay 12 is supported by the first support 30. When you move it downward,
The first inclined surface 33a of the urging member 33 comes into contact with the second inclined surface 37a of the base material 37. And
Due to the further downward movement of the urging member 33, the base material 37 and the second support 31 are moved to the stay leg 1 based on the wedge action between the first inclined surface 33a and the second inclined surface 37a.
It moves to the fourth side. As a result, the stay leg 14 is first supported on the outer peripheral surface by the first support 30 and the second support 31, and then the base 37 is further moved against the elasticity of the spring 36. Then, the respective pressing projections 32 are forcibly pressed against the outer stay legs 14, so that the respective notches 15 are simultaneously formed.

(Support Unit) On the other hand, the support unit 29
Is a rod-shaped first support member 40 that is slidable on the same axis as the stay leg portion 14 and that can be inserted into and removed from the stay leg portion 14 through a distal end opening 14a of the stay leg portion 14; Similarly, the stay leg 14 is slidable on the same axis and is disposed adjacent to the first support member 40, and the first support member 40 is attached to the stay leg 14.
The second support member 50 is inserted into the stay leg portion 14 through the distal end opening portion 14a in a state where the second support member 50 is inserted into the stay leg portion 14a.
And a concave support surface 47 formed on the outer surface of the first support member 40 and supporting the stay inner wall projection 14b, which is deformably projecting inward by forming the notch 15 in the stay leg 14, from the inside. Has become. The first support member 40 and the second support member 50 are supported in a substantially horizontal state by a holder 38 provided on the upper surface of the table 26 and using hydraulic pressure or pneumatic pressure as an operation source.

(First Support Member) The first support member 40 is, as shown in FIGS.
The support portion 4 is located on the side of each of the pressing projections 32 inside the stay leg portion 14 when inserted into the stay leg portion 4, and has a semicircular cross section substantially the same as the inner diameter of the stay leg portion 14.
1, an arm portion 42 pivotally supported by a base portion 44 supported by the holder 38, and a tapered portion 43 connecting the support portion 41 and the arm portion 42 in series.
The support portion 41 has an arc surface 45 that is directed toward the record pressing protruding piece 32 and is in close contact with the inner wall surface of the stay leg portion 14, and a contact surface 46 on which the second support member 50 is in close contact. The arc surface 45 is provided with four support surfaces 47 at required intervals. These concave support surfaces 47
The notch 15 is formed corresponding to the position where the notch 15 is formed, and the shape of the corresponding notch 15 and the stay leg 1
4 is formed in a shape considering the thickness.

The tapered portion 43 is formed with an inclined surface 48 having a required angle.
When the second support member 50 is inserted into the stay leg 14 into which the second support member 50 is inserted, the tip of the second support member 50 comes into contact with the inclined surface 48. Thus, the width and thickness of the arm portion 42 are smaller than those of the support portion 41. Therefore, the first support member 4
In the case of 0, the cross section of the arm portion 42 has the shape shown in FIG. 6B, and the cross section of the support portion 41 where the support surface 47 is not formed has a semicircular shape shown in FIG. 6C. At the same time, the section of the support portion 41 where the support surface 47 is formed has the shape shown in FIG.

The first support member 40 has the following structure.
By being pivotally supported with respect to the base portion 44, the support portion 41 located on the distal end side is arranged to be swingable toward the second support portion 41. Moreover, a coil spring 49 as a biasing means disposed on the jig 27 is provided.
However, the first support member 40 is always in contact with the second
It is urged toward the support member 50 and is in an appropriate oblique state on a horizontal plane. Accordingly, in a state where only the first support member 40 is inserted into the stay leg portion 14, as shown in FIG. 8, the support portion 41 is located on the left side in the figure by the urging of the coil spring 49, and the arc surface 45 and the stay leg portion 14 are moved.
Is in a non-adhesive state with the inner wall surface. Therefore, when the notch 15 is formed and the second support member 50 is pulled out, as shown in FIG. 11, the stay inner wall protrusion 14b which is deformed and protrudes inward by the formation of the notch 15 is formed. Interference with the first support member 40 can be suitably eliminated.

(Second Support Member) As shown in FIGS. 5 and 6 (a), when the second support member 50 is inserted into the stay leg 14, It is located on the opposite side of the pressing projection 32, and has a semicircular cross section substantially the same as the inner diameter of the stay leg 14. The second support member 50 has the same semicircular cross-sectional shape from the distal end to the proximal end, and the first support member 40 is inserted into the stay leg 14 in a state where the first support member 40 is inserted into the stay leg 14. Inserted into Therefore, when the second support member 50 is inserted into the stay leg portion 14, the tip of the second support member 50 contacts the inclined surface 48 of the tapered portion 43 of the first support member 40 extending horizontally. Thereby, the first support member 40 is gradually pressed toward the pressing protrusion 32. When the second support member 50 is completely inserted, the contact surface 5 of the member 50
1 is in close contact with the contact surface 46 of the first support member 40, and the arc surface 52 is in close contact with the inner surface of the stay leg 14, so that the support portion 41 is in close contact with the inner wall of the stay leg 14. Therefore, in the support unit 41 of the embodiment, the first
By simultaneously inserting the support member 40 and the second support member 50 into the stay leg 14, the inside of the stay leg 14 can be supported.

That is, the support portion 41 is provided with the notch 1
Prior to the molding of No. 5, first, the first support member 40 is inserted into the stay leg 14 (FIG. 7A), and then the second support member 50 is inserted into the stay leg 14 (FIG. 7B). ), The portion where the pressing protrusion 32 does not directly contact is supported from the inside by the arc surface 45 of the first support member 40 and the arc surface 52 of the second support member 50. When the notch 15 is formed by forcibly pressing the pressing protruding pieces 32 in the notch forming part 28, as shown in FIG. 7C, the pressing protruding pieces 32 are deformed inward by direct contact with the pressing protruding pieces 32. The stay inner wall projections 14b that protrude are supported from the inside by the support surface 47. After the notch 15 is formed, if the second support member 50 is pulled out from the stay leg portion 14, the first support member 40 urged by the coil spring 49 is occupied by the second support member 50. 7D, the interference with the stay inner wall protrusion 14b is eliminated, and the first support member 40 can be pulled out from the stay leg portion 14, as shown in FIG. 7D.

Next, a notch forming method of the present embodiment using the notch forming apparatus 25 having the first support member 40 having the support surface 47 and the second support member 50 will be described with reference to FIGS. explain.

The headrest stay 12, which is formed by bending a pipe material into a substantially U-shape in advance, is set and held on a table 26 in a notch forming device 25. Then, the notch 1 formed by the pressing protruding piece 32 of the notch forming portion 28 is formed.
Prior to the molding of 5, the first support member 40 is first inserted into the stay leg 14 with the operation of the holder 38 as shown in FIG. When the insertion of the first support member 40 is completed, the second support member 50 is moved to the stay leg 14 under the operation of the holder 38 as shown in FIG.
Insert into. As a result, the first support member 40 is fixedly held inside the stay leg portion 14 in a state where the respective support surfaces 47 formed on the support portion 41 are directed toward the pressing protrusion 32.

When the insertion of the first support member 40 and the second support member 50 is completed, as shown in FIG.
By urging the urging member 33 downward by urging means (not shown), the base material 37 and the second
The support 31 is urged toward the stay leg 14, and the second
The support 31 is provided together with the first support 30 on the stay legs 14.
Is supported. As a result, the stay leg 14 has its outer peripheral surface supported by the first support 30 and the second support 31 and its inner peripheral surface supported by the first support member 40 and the second support member 50. State.

Next, as the base material 37 is further urged and moved, the respective pressing protruding pieces 32 are forcibly pressed against the outer surface of the stay leg portion 14. As a result, the stay legs 14
Only the part where each pressing protrusion 32 is directly pressed is deformed, and the formed stay inner wall protrusion 14 b is supported by the support surface 47 of the support member 40. Therefore, stay leg 1
4, four notches 15 are simultaneously formed by the distal end portion of each pressing protrusion 32 and the support surface 47.

When the formation of the notch 15 is completed, the urging of the urging member 33 is released, so that the base material 37 and the second support 31 move away from the stay leg 14 as shown in FIG. I do.

On the other hand, in the support section 41, FIG.
First, the second support member 50 is pulled out from the stay leg 14 as shown in FIG. Thereby, the first support member 4
When the coil support 49 is urged, the distal end is displaced toward the space occupied by the second support member 50 to return to the original horizontal oblique state, and the first support member 40 and the stay Interference with the inner wall projection 14b is eliminated. Therefore, the first support member 40 can be pulled out from the stay leg 14, as shown in FIG.
By pulling out the first support member 40, the formation of the notch 15 on the headrest stay 12 is completed.

As described above, the notch forming apparatus 25 of this embodiment
In forming the notch 15 in the stay leg 14 by forcibly pressing the pressing protruding piece 32, the first support member 40 is inserted into the stay leg 14, and then the second support member 50 is inserted. If the first support member 40 is fixed and held in a state where the support surface 47 formed on the support portion 41 is directed toward the pressing protruding piece 32, the notch 15 is prevented while the overall deformation of the stay leg portion 14 is prevented. Can be suitably molded. After the notch 15 is formed on the stay leg 14, the second support member 5 inserted into the stay leg 14 is formed.
When the first support member 40 is pulled out, the interference between the stay inner wall projection 14b, which is deformably projecting inward and the first support member 40, is eliminated by the formation of the notch 15, and the first support member 40 is pulled from the stay leg portion 14. It is possible to pull out. Since the first support member 40 can swing toward the second support member 50 and is urged by the coil spring 49, if the second support member 50 is pulled out of the stay leg 14 after the notch 15 is formed. Interference with the stay inner wall projection 14b is automatically canceled, and the stay can be easily and easily pulled out from the stay leg 14.

In the notch forming method of this embodiment using the notch forming device 25 having the first support member 40 and the second support member 50, the first support member 40 provided with the support surface 47 is connected to the stay leg. The pressing projection 32 is forcibly pushed to the stay leg 14 in a state where the second support member 50 is inserted into the stay leg 14 and the support surface 47 is directed toward the pressing projection 32 at the same time. The notch 15 is formed by pressing the stay leg 14
Is prevented, and a notch with high processing accuracy can be formed. Moreover, the first support member 40 is
If the second support member 50 is pulled out from the stay leg portion 14, the interference with the stay inner wall protrusion 14b which is deformed inward by forming the notch 15 is eliminated.
5 can be pulled out of the stay leg 14 after molding, and the headrest stay 1 can be used a plurality of times.
The manufacturing cost of No. 2 does not increase. In addition, since the first support member 40 and / or the second support member 50 do not remain inside the stay leg portion 14, the problem of increasing the weight of the headrest stay 12 is also eliminated.

In the embodiment, the second support member 50 is illustrated as having a semicircular cross section. However, the cross section of the second support member 50 is not limited to this. As long as the support portion 41 can be suitably held, for example, a circular cross section, an elliptical cross section, a quadrangular cross section, or the like may be used.

[0029]

As described above, according to the notch forming apparatus for a headrest stay according to the present invention, the first support member is inserted into the stay leg, then the second support member is inserted, and the support surface is pressed against the pressing surface. Since the first support member is fixedly held in a state where the first support member is directed to one side, there is an advantageous effect that the notch can be suitably formed while preventing the overall deformation of the stay leg. Further, after the notch is formed on the stay leg, the second support member inserted into the stay leg is pulled out, and the stay inner wall protrusion and the first support member, which are deformed inward by the formation of the notch, are formed. Is eliminated, and the first support member can be pulled out from the stay leg. Since the first support member is displaceable toward the second support member and is urged by the coil spring, if the second support member is pulled out from the stay leg after the notch is formed, the first support member may interfere with the stay inner wall protrusion. Is automatically eliminated, and there is an advantage that the stay can be easily and easily pulled out from the stay leg.

According to a headrest stay notch forming method according to another invention, a first support member provided with a support surface is inserted into a stay leg, and a second support member is inserted into the stay leg. The notch is formed by forcibly pressing the pressing protrusion against the stay leg in a state where the support surface is directed to the side of the pressing protrusion, so that the overall deformation of the stay leg is prevented and processing accuracy is reduced. It has the beneficial effect of forming high notches. Moreover, if the first support member is pulled out of the stay leg, the interference with the stay inner wall protrusion that is deformed inward by the formation of the notch is eliminated, and the first support member is pulled out of the stay leg. The headrest stay can be used a plurality of times and the manufacturing cost of the headrest stay does not increase. Also, the first
Since the support member and / or the second support member does not remain inside the stay leg portion, the problem of increasing the weight of the headrest stay can be solved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a notch forming portion and a support portion constituting a notch forming device of a headrest stay according to one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view in a state where a headrest stay is set in the notch forming apparatus of the embodiment.

FIG. 4 is a front view in a state where a headrest stay is set in the notch forming apparatus of the embodiment.

FIG. 5 is a perspective view of a main part of a first support member and a second support member constituting a support part.

6A is a cross-sectional view taken along the line VIa-VIa in FIG. 5, and FIG.
FIG. 6C is a sectional view taken along the line VIb-VIb, FIG. 6C is a sectional view taken along the line VIc-VIc in FIG. 5, and FIG. 6D is a sectional view taken along the line VId-VId in FIG.

FIG. 7 (a) shows a first portion of a stay leg of a headrest stay.
Sectional view in which a support member was inserted, (b) is a sectional view in which a second support member was inserted into a stay leg in which a first support member was inserted, and (c) was a view in which a first support member and a second support member were inserted. Then, the cross-sectional view during the notch forming in which the pressing protruding piece is forcibly pressed, (d) the interference between the second support member and the stay inner wall protrusion is eliminated by pulling out the second support member after the notch forming It is sectional drawing of the state performed.

8A is a plan sectional view showing a step of forming a notch on the headrest stay, and FIG. 8B is a sectional view taken along the line VIII-VIII of FIG. 8, showing a state where the first support member is inserted into the stay leg. ing.

9A is a plan sectional view showing a step of forming a notch on the headrest stay, and FIG. 9B is a sectional view taken along the line IX-IX of FIG. 9, showing a state in which a second support member is inserted into a stay leg. ing.

FIG. 10A is a plan sectional view showing a step of forming a notch on a headrest stay, and FIG. 10B is a sectional view taken along line XX of FIG. 10A, showing a front end of a pressing projection and a support surface of a first support member. This shows a state during notch forming.

FIG. 11A is a plan sectional view showing a step of forming a notch on a headrest stay, and FIG. 11B is a sectional view taken along the line YY of FIG. 11, where the first support member is pulled out by pulling out the second support member. This shows a state in which the second support member is displaced toward the space occupied by the second support member, whereby interference between the first support member and the stay inner wall projection is eliminated.

12A is a plan sectional view showing a step of forming a notch on the headrest stay, and FIG. 12B is a sectional view taken along the line ZZ of the headrest stay, showing a state where the first support member is pulled out from the stay leg. ing.

FIG. 13 is a perspective view showing a headrest mounted on the seat back.

[Explanation of symbols]

 Reference Signs List 12 headrest stay 14 stay leg 14a tip opening (opening) 14b stay inner wall protrusion 15 notch 32 pressing protrusion 40 first support member 47 support surface 49 coil spring (biasing means) 50 second support member

Claims (6)

[Claims] 1. A notch (15) for adjusting a height position with respect to a seat back in a stepwise manner is provided on a stay leg (14) of a headrest stay (12) formed by bending a pipe material. In a notch forming apparatus that is formed by forcible pressing, the stay leg (14) is slidable on the same axis as the stay leg (14), and is opened through an opening (14a) at the tip of the leg.
A first support member (40), which can be inserted into and removed from the first support member (40), which is also slidable on the same axis as the stay leg (14), and is disposed adjacent to the first support member (40); With the support member (40) inserted into the stay leg (14), the rod-shaped second support member (50) that can be inserted into and removed from the stay leg (14) through the opening (14a). A stay inner wall projection (14b) formed on the outer surface of the first support member (40) and projecting inward by deformation of a notch (15) in the stay leg (14) is supported from the inside. A concave support surface (47), by inserting the second support member (50) after inserting the first support member (40) into the stay leg (14),
The first support member (40) is fixed and held with the support surface (47) directed toward the pressing protruding piece (32), and after completion of the formation of the notch (15), the stay leg (14) ), The first support member (40) can be pulled out while avoiding interference with the stay inner wall protrusion (14b) by pulling out the second support member (50). Notch forming device for headrest stay. 2. The first support member (40) is disposed such that the tip end thereof is displaceable toward the second support member (50), and the first support member (40) is displaced from the stay leg (14). )
After the second support member (50) is pulled out, it is displaced toward the space occupied by the second support member (50), whereby the stay inner wall protrusion (14b)
The notch forming device for the headrest stay according to claim 1, wherein the interference between the stay and the support surface (47) is eliminated and the pullout from the stay leg (14) is permitted. 3. The first support member (40) is constantly urged toward the second support member (50) by an urging means (49) that comes into contact with the pressing protrusion (32). Claim 2
The notch forming device of the headrest stay according to the above. 4. A notch (15) for adjusting a height position with respect to a seat back stepwise is provided on a stay leg (14) of a headrest stay (12) formed by bending a pipe material. In a notch forming method which is formed by forcible pressing, the stay leg (14) is slidable on the same axis and is insertable into and removable from the stay leg (14);
A first support member (40) having a support surface (47) formed on an outer surface capable of supporting a stay inner wall projection (14b) that is deformably inwardly formed by forming a notch (15) in (14), The first leg is slidable on the same axis as the stay leg (14).
A first support member disposed adjacent to the support member (40);
(40) is inserted into the stay leg (14), and the rod-shaped second support member (50) that can be inserted into and removed from the stay leg (14) is used. Prior to forming the notch (15) by (32), the first support member (40) is inserted into the stay leg (14), and then the second support member (50) is inserted into the support surface. The first support member (40) is fixedly held while the (47) is directed toward the pressing protrusion (32), and then the pressing protrusion (32) is forcibly applied to the stay leg (14). To form the notch (15) with the tip of the pressing protruding piece (32) and the support surface (47) of the first support member (40) .After the completion of the formation of the notch (15), Pulling out the second support member (50) from the stay leg (14), and then pulling out the first support member (40) while avoiding interference with the stay inner wall protrusion (14b). Notch forming method of the headrest stay characterized. 5. After the second support member (50) is pulled out from the stay leg (14), the first support member (40) is moved toward the space occupied by the second support member (50). 5. The first support member (40) is pulled out of the stay leg (14) while eliminating interference between the stay inner wall protrusion (14b) and the support surface (47). Notch forming method for headrest stays. 6. The first support member (40) is configured to bias the second support member (50) to the stay leg (14) by an urging means (49) that comes into contact with the pressing protruding piece (32). 6. The notch forming method for a headrest stay according to claim 5, wherein interference with the stay inner wall protrusion (14b) is automatically eliminated by pulling out the stay from the headrest stay.