JP2002079333A - Metal cylinder and metal bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that an inner diameter dimension is changed by the external force applied as a result of cooling of a welded section. SOLUTION: When a metal bracket 12 is formed by mutually engaging respective protrusions and notches which are arranged at left/right side A, B of a metal plate, sections P-S astride adjoining protrusions are squeezed to a stripe shape to be indented, the stock pushed away from the indents P-S is supplied to a surrounding of respective protrusions, the adhesion between protrusions is increased to realize strong joining, further, a width of a root section in the protrusion at the side to be inserted from a joining direction is designed two holds of a width of a root section in the protrusion at the side to insert, thus, sufficient strength is given to a joining section. As a result, a change in an inner diameter dimension generated by the external force applied resulting from cooling of a welding section is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cylinder and a metal bracket, and more particularly to a metal cylinder and a metal bracket formed by joining a pair of sides of a metal plate.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 37, a seat back 1 of a first seat mounted on an automobile is known.
A metal frame 1a having a substantially square pipe shape whose axis is oriented in a substantially horizontal direction is disposed above the inside of the metal frame 1a. The metal frame 1a has a substantially square pipe whose axis is oriented in a substantially vertical direction. Metal brackets 1b and 1c are attached. Headrests 2 projecting substantially vertically downward from the headrests 2 are provided on the metal brackets 1b and 1c.
a, 2b, a substantially cylindrical headrest support,
4 is inserted. These metal brackets 1b and 1c
As shown in FIG. 38, the metal plate is bent so that the left and right sides are opposed to each other, and is formed into a square pipe shape by joining the sides. Since the joint portions of the metal brackets 1b and 1c are designed including a springback, a gap having a predetermined width is provided between each side. Then, in a state where the joint portion is substantially in close contact with one flat wall surface of the metal frame 1a, welding is performed between the bent portions of the metal brackets 1b and 1c and the wall surface of the metal frame 1a abutting on the bent portions. By doing so, the metal brackets 1b and 1c are connected to the metal frame 1a.
Fixed to.

[0003]

In the above-mentioned conventional metal cylindrical body, since the metal brackets 1b and 1c are welded to the metal frame 1a, the welding portion 5 shown in FIG. 38 is cooled. Shrinks with Then, due to the contraction of the welded portion 5, the bent portions of the metal brackets 1b and 1c that are in contact with the metal frame 1a are pulled to the sides separated from each other. Therefore, the respective sides of the metal brackets 1b and 1c are separated from each other, and the gap becomes wider than the predetermined width. For this reason, there has been a problem that the inner diameter is changed by welding, despite the fact that the inner diameter is designed to be a size that can support the headrest support before the welding without play. The present invention has been made in view of the above problems, and an object of the present invention is to provide a metal cylindrical body and a metal bracket capable of suppressing a change in an inner diameter dimension generated by an external force applied along with cooling of a welding portion. I do.

[0004]

Means for Solving the Problems In order to achieve the above object, according to the first aspect of the present invention, a pair of side edges of a metal plate is formed with concave and convex shapes which are engaged with each other so as to prevent the metal plates from coming off, and each side is opposed to each other. Then, the uneven shape is meshed and joined. Claim 1 configured as described above.
In the invention according to (1), the pair of sides of the metal plate material are opposed to each other, so that the irregularities formed on each side are engaged with each other and joined. At this time, the sides are engaged with each other so that they cannot come off, and are firmly joined together. Then, when the formed metal cylinder is welded to another metal member, the welded portion contracts as the welded portion is cooled, and the joined side edges are separated. Even if an external force is applied in the direction or in the direction in which the sides meet, displacement of the firmly joined sides is prevented, and a change in the inner diameter of the metal cylinder is suppressed.

[0005] As an example of the uneven shape, the invention according to claim 2 is characterized in that, in the metal cylindrical body according to claim 1, the uneven shape formed on each side substantially corresponds to the shortest distance in the joining direction. It is configured to be the same. In the invention according to claim 2 configured as described above, the shortest distance to the joining direction in the uneven shape formed on one side is the shortest distance to the joining direction in the uneven shape formed on the other side. An uneven shape is formed so as to be substantially the same as the distance.

That is, when a plurality of protrusions are formed on each side and the opposing protrusions are alternately meshed with each other, the sum of the shortest distance of each protrusion formed on one side in the joining direction and the other is determined. The sum of the shortest distances with respect to the joining direction in each of the protrusions formed on the side is substantially the same. The shortest distance here is the sum of the minimum widths of the projections in the joining direction if the above-described projections are formed. It is the sum of the widths of the parts in the joining direction. The shortest distance may be such that the concavo-convex shape is formed so that the shortest distance in each side is substantially the same, or the concavo-convex shape is such that the shortest distance in a part of each side is substantially the same. A shape may be formed.

[0007] As an example of a technique for joining the respective sides, the invention according to claim 3 is directed to the metal cylinder according to any one of claims 1 and 2 described above. In a state in which the formed concavities and convexities are engaged with each other, the concavo-convex shape is crushed in the thickness direction so as to cover the convex portion and the concave portion facing each other. In the invention according to claim 3 configured as described above, when the concavo-convex shapes formed on each side are engaged with each other, they are crushed and joined in the thickness direction so as to cover the opposing convex portion and concave portion. Then, the crushed portion is moved toward the boundary between the convex portion and the concave portion, so that the adhesion at the boundary is increased, and the strength of the joint portion is increased.

As an example of the crushing here, the invention according to claim 4 is the metal cylinder according to claim 3, wherein the metal cylinder is crushed in a streak shape so as to extend over the projection and the recess. It has a configuration with. In the invention according to claim 4 configured as described above, the streaks are provided by being crushed so as to extend over the convex portions and the concave portions. Then, the meat is dispersed from the notch toward the boundary between the convex portion and the concave portion.

As an example of the case where the notch is formed, the invention according to claim 5 is directed to the metal cylindrical body according to claim 4, wherein the notch is provided at a boundary between the convex portion and the concave portion. It is structured so that it can be squashed in a streak shape while escaping diagonally. In the invention according to claim 5 configured as described above, if the notch is crushed in a streak shape while being released in a diagonal direction with respect to the boundary between the convex portion and the concave portion, the notch is formed over a wide range in the joining direction. Are dispersed. Therefore, the method is useful as a method for dispersing meat over a wide range at the above-mentioned boundary, and realizing a stronger joint. As described above, if the notch is formed while escaping in the diagonal direction with respect to the boundary, it is advantageous in that the meat can be dispersed over a wide range in the joining direction, but the notch extends over the convex portion and the concave portion. From the viewpoint that it is only necessary to be able to be crushed in a streak like this, it is similarly possible to attach in a direction substantially orthogonal to the boundary between the convex portion and the concave portion.

It is to be noted that the structure according to claims 4 and 5 is useful in that the strength of the joint portion can be easily increased only by making a notch, but such a structure is merely an example. As another example of the crushing, the invention according to claim 6 is directed to the metal cylinder according to claim 3, wherein the metal cylinder extends over the convex portion and the concave portion.
It has a configuration in which it is crushed into a substantially circular shape and a depression is provided. In the invention according to claim 6 configured as described above,
It is attached by being crushed so that a substantially circular depression extends over the convex portion and the concave portion. Then, the meat is dispersed from the depression toward the boundary between the projection and the depression. In this case, since the meat is dispersed from a relatively wide range, supplying a large amount of meat to the above-mentioned boundary is useful in that a stronger joint can be realized.

[0011] As another example of the crushing, the invention according to claim 7 is directed to the metal cylinder according to claim 3 so as to extend over the projection and the recess, and
It has a configuration in which it is crushed in a band shape to form a dent so as to be wider on the side away from the boundary between the convex portion and the concave portion. In the invention according to claim 7 configured as described above,
The band-shaped depression is attached by being crushed so as to extend over the convex portion and the concave portion. Then, the meat is dispersed from the depression toward the boundary between the projection and the depression. At this time,
Since the depression is provided to be wider on the side away from the boundary, the meat is distributed from the part remote from the boundary and supplied to the boundary. Therefore, the configuration is useful in that a sufficient thickness of meat can be supplied at the same boundary while reducing the thin range at a portion near the boundary.

Further, as another example of the crushing,
According to an eighth aspect of the present invention, in the metal cylindrical body according to the third aspect, the metal cylindrical body is widened at the boundary between the convex portion and the concave portion and at the boundary between the convex portion and the concave portion, and is separated from the boundary. It is configured such that a narrow portion and a wide portion are alternately provided on the side and crushed in a band shape to form a depression.
In the invention according to claim 8 configured as described above, the band-shaped depression is provided by being crushed so as to extend over the convex portion and the concave portion. Then, the meat is dispersed from the depression toward the boundary between the projection and the depression. At this time, since the recess is made wider at the same boundary, the joining strength is enhanced over a wide range in the joining direction. In addition, since the depression is provided so that the narrow portion and the wide portion are alternately provided on the side separated from the boundary, more meat is efficiently processed toward the same boundary from the side separated from the joint portion. This is a useful configuration in that it can be assembled.

[0013] As a specific application example of the metal cylindrical body according to the present invention, the invention according to claim 9 is characterized in that a plurality of protrusions meshing with a pair of side edges so as to be able to be locked from each other are provided in the joining direction. A metal plate material formed so that the shortest distances are almost the same, while joining the jointed part to one substantially flat wall surface, engaging each projection with each side facing each other, and forming a streak over each projection By being crushed and scored, the joint is formed into a substantially square pipe shape, and is arranged while orienting the axis in a substantially horizontal direction above the inside of the seat back of the first seat mounted on the vehicle. The axis is oriented in a substantially vertical direction with respect to the pipe-shaped metal frame, and the seam is substantially adhered to the substantially flat wall surface of the metal frame. The bent portion of the metal cylinder abutting on the wall of the system is welded to the wall, and a substantially cylindrical headrest support that supports a headrest stay projecting substantially vertically downward from the headrest is inserted from substantially vertically above. There is a configuration. That is, the present invention is also effective as a metal bracket that supports the headrest support with the seat back of the first seat mounted on the automobile.

[0014] As another specific application example of the metal cylinder according to the present invention, the invention according to claim 10 is characterized in that a plurality of projections meshing with a pair of side edges so as to be able to be locked together are joined. The metal plate material formed so that the shortest distance to the direction is substantially the same, while including the seaming site on one substantially flat wall surface, making each protrusion mesh with each side facing each other, so as to extend over each protrusion By crushing and scoring in a streak shape, the joint is formed into a substantially square pipe shape, and the axis is oriented in a substantially horizontal direction above the inside of the seat back of the second seat or third seat mounted on the car A pair of pipe-shaped metal frames arranged substantially parallel to each other at a predetermined interval while straddling each metal frame while orienting the axis in a substantially vertical direction. The bent portion of the metal frame, which is in close contact with the substantially flat wall surface of the metal frame and is in contact with the wall surface of the metal cylindrical body, is welded to the wall surface and protrudes substantially vertically downward from the headrest. A substantially cylindrical headrest support for supporting the headrest stay is inserted from substantially vertically above. That is, the present invention is also effective as a metal cylinder that supports the headrest support with the seat back of the second or third seat mounted on the automobile.

[0015]

As described above, according to the present invention, it is possible to provide a metal cylindrical body capable of suppressing a change in the inner diameter dimension generated by an external force applied with cooling of a welding portion. Further, according to the second and third aspects of the invention, it is possible to increase the strength at the joint portion. Furthermore, according to the invention according to claim 4, the strength at the joint portion can be easily increased. Further, according to the invention of claim 5, the joining strength can be increased over a wide range in the joining direction. Further, according to the invention according to claim 6, more meat can be supplied to the boundary between the convex portion and the concave portion to increase the strength.

Further, according to the invention according to claims 7 and 8, while maintaining the strength of the portion near the boundary between the convex portion and the concave portion, more meat is provided at the same boundary than at the portion separated from the same boundary. To achieve a strong joint. Further, according to the ninth aspect of the present invention, a headrest support is provided by a seat back in a first seat mounted on an automobile, which is capable of suppressing a change in an inner diameter dimension generated by an external force applied with cooling of a welding portion. Can be provided. Furthermore, according to the invention according to claim 10, a seat back in a second seat or a third seat mounted on an automobile, which can suppress a change in an inner diameter dimension generated by an external force applied in association with cooling of a welding portion. To provide a metal bracket that supports the headrest support.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a headrest support structure using a metal bracket according to an embodiment of the present invention. As shown in FIG. 1, a substantially square pipe-shaped metal frame 11 whose axis is oriented in a substantially horizontal direction is disposed above the interior of a seat back 10 of a first seat mounted on an automobile. The frame 11 is provided with metal brackets 12 and 13 each having a substantially square pipe shape whose axis is oriented in a substantially vertical direction.

Into the metal brackets 12, 13, substantially cylindrical headrest supports 30, 40 for supporting headrest stays 21, 22 projecting substantially vertically downward from the headrest 20, are inserted. Hereinafter, with respect to the headrest support, only the headrest support 30 will be described, but the same applies to the headrest support 40. Further, regarding the metal bracket, only the metal bracket 12 will be described, but the same applies to the metal bracket 13. Metal bracket 12
FIG. 3 is obtained by bending the metal plates shown in FIG. 2 so that the left and right sides A and B face each other on the near side of the drawing sheet, and bending and joining the sides A and B with each other. It is formed in a substantially square pipe shape as shown in FIG.

At this time, the right and left sides A and B of the metal bracket 12 are provided with the uneven shape according to the present invention so as to be engaged with each other. The left side A is linearly formed from the upper corner in a direction substantially perpendicular to the upper and lower sides C and D, and then the notch A1, the protrusion A2, and the notch A
3, protrusion A4, notch A5, protrusion A6, notch A7
Are configured in order. On the other hand, the right side B is linearly formed from the upper corner in a direction substantially perpendicular to the upper and lower sides C and D, and then bent to the right at a substantially right angle to form the protrusion B1, the notch B2, Projection B3, Notch B4, Projection B5, Notch B
6, the projection B7 is configured in order. With such a configuration, each of the projections A2, A4, A6, B1, B3, B5, and B7 has a corresponding notch A1, A3, A5, A7, B2, B
4, B6. In this sense, each projection constitutes a convex portion according to the present invention, and each notch constitutes a concave portion according to the present invention.

A portion P straddling the projection B1 and the projection A2, a portion Q straddling the projection B3 and the projection A4, a portion R straddling the projection A4 and the projection B5, and a portion S straddling the projection A6 and the projection B7. The metal bracket 12 is crushed in a streak shape in the thickness direction of the metal bracket 12 so as to be notched. Then, the notched portions P to S are integrated by the adjacent projections being crushed together in the thickness direction. In addition, since the flesh of each of the notched portions P to S is dispersed to the peripheral portion, the notches P to S are provided for each protrusion and the portion adjacent to the protrusion.
Is supplied. Then, the projections are brought into close contact with each other, so that springback can be prevented, and a strong joint can be realized.

As shown in FIG. 2, the width a of the root portion narrowed in the splicing direction at the projection A4 is smaller than the width b of the root portion narrowed in the splicing direction at the projections B3 and B5. , B = １ ／ a. Then, sufficient strength can be obtained at the engagement portion. Specifically, the displacement after welding can be suppressed to 0.05 mm, and the tensile strength can be increased to 100 kg / 0.1 mm. Therefore, the width at the base of the protrusion A4 provided on each side A is the same as the sum of the widths at the base of the protrusions B3 and B5 provided on each side B. In this sense, the sum of the widths of the root portions on each side means the shortest distance with respect to the joining direction in the present invention. Here, a locking claw 31 integrally formed with the headrest support 30 is inserted into the notch 12a formed in the upper opening of the metal bracket 12, as shown in FIG. Then, the locking claw 31 is formed by the notch 12a.
Since the rotation of the headrest support 30 in the circumferential direction is restricted, the headrest support 30 is prevented from rotating in the circumferential direction with respect to the metal bracket 12, so that the play of the headrest support 30 can be suppressed.

As shown in FIG. 1, the metal bracket 12 formed by the above-described method is formed by welding a bent portion in a state where the joint portion is substantially in contact with the wall surface of the metal frame 11. Is fixed to the metal frame 11. When the above welding is performed, as shown in FIG. 5, since the welding portion 11a contracts as it cools, an external force is applied to the metal bracket 12 in the direction of the arrow.
However, since the joining portions of the metal bracket 12 according to the present embodiment are strongly joined as described above, even if an external force is applied as shown in FIG. Deformation is suppressed by the coupling force of each of the projections and notches.

As described above, the metal bracket 12 is designed to have a predetermined inner diameter so that the headrest support 30 does not rattle when the headrest support 30 is inserted from the upper opening. That is,
As shown in FIG. 6, a resin spring 32 is integrally formed on the outer peripheral wall surface of the headrest support 30 oriented in the vehicle width direction. The resin spring 32 is provided with a flexible portion 32a which is formed between vertical grooves provided substantially in parallel in the vertical direction at predetermined intervals and has flexibility in a substantially radial direction. Further, a plurality of protrusions 32b protruding outward are formed on the flexible portion 32a. With this configuration, when the headrest support 30 is inserted into the metal bracket 12, as shown in FIG.
While pressing inward, the inner peripheral surface of the metal bracket 12 is pressed to prevent rattling of the headrest support 30 in the vehicle width direction.

As shown in the figure, the outer peripheral wall surface of the headrest support 30 oriented in the front-rear direction of the vehicle
The resin spring 33 is formed integrally. Resin spring 33
Is constituted by a substantially rectangular flexible piece 33a formed by a notch groove provided in a substantially U-shape,
Before insertion into the metal bracket 12, the free end is slightly protruded outward as shown in FIG. When the headrest support 30 is inserted into the metal bracket 12, the flexible piece 33a is bent inward by being pressed by the inner peripheral surface of the metal bracket 12, as shown in FIG.
At this time, since the flexible piece 33a presses the inner peripheral surface of the metal bracket 12 to restore the shape before insertion, it is possible to prevent the headrest support 30 from rattling in the vehicle front-rear direction.

As described above, the inner diameter of the metal bracket 12 is required to have a high precision when each structure for preventing the headrest support 30 from rattling is required.
The suppression of the deformation described above is useful. At this time, the reduction in the inner diameter of the metal bracket 12 is also suppressed, so that
In inserting the headrest support 30 into the metal bracket 12, smooth insertion with a small load is realized without generating an excessive load. Further, when the headrest stay 21 is inserted through the headrest support 30, a stable load can be obtained.

In the above description, the support structure of the headrest support provided on the seat back of the first seat has been described. However, the present invention can be applied to the support structure of the headrest support provided on the seat back of the second or third seat. It is possible. In the case of the seat back in the second seat or the third seat, as shown in FIG. 10, pipe-shaped metal frames 14, 14 whose axes are oriented in a substantially horizontal direction.
Are arranged substantially in parallel at a predetermined interval,
The metal bracket 12 is fixed by welding so as to straddle between the metal frames 14 and 14.

Since the welding at this time is performed while joining the upper corner and the lower corner of the metal frame which comes into contact with the metal bracket 12 as shown in FIG. An external force is applied along with the cooling such that the left and right sides of the joint portion are drawn in directions approaching each other. However, since the joining portions of the metal bracket 12 according to the present embodiment are firmly joined, even when external force is applied as shown in FIG. Deformation is suppressed by the coupling force of each notch. Therefore, it is useful in that the change in the inner diameter of the metal bracket 12 can be suppressed.

Note that the joining portion of the metal bracket 12 according to the present embodiment is merely an example, and
It is also possible to apply another uneven shape as shown in FIG. 1 and FIG. Also in this case, similarly to the present embodiment,
Since the opposing sides are strongly engaged with each other, a change in the inner diameter due to an external force applied at the time of welding can be suppressed. In addition, the metal bracket 1 according to the present embodiment
In FIG. 2, notches are provided so as to straddle between a portion where each projection becomes narrow in the joining direction and a portion where each projection becomes wide in the joining direction, as shown in FIG. Since the configuration is merely an example, as shown in FIGS. 11 and 12, notches are formed while escaping obliquely with respect to the splicing direction so that each projection straddles portions that are wide in the splicing direction. It is also possible. Then, a higher strength can be secured as compared with a case where a notch is formed in a portion where the projection becomes narrower in the joining direction, so that the deformation of the metal bracket 12 can be more reliably suppressed.

At this time, as shown in FIGS. 13 and 14, by adding a notch in a direction orthogonal to the joining direction, higher strength can be secured.
Needless to say, as shown in FIG. 15, it is possible to increase the strength by adding a similar notch to the joint portion shown in FIG. 13 to 15.
In order to improve the strength at the joint part, the notch added at has escaped diagonally to the boundary of the joint part, achieving crushing over a wide range in the joint direction, but at the joint It is also possible to make a notch in a direction substantially orthogonal to the direction.

Further, in the above description, the notch is formed by squeezing in the form of a streak so as to extend over the convex portion and the concave portion facing each other at the joint portion. From the viewpoint that it is only necessary to be able to crush and form a depression, crushing may be performed in another shape. For example, as shown in FIG. 16 to FIG. 18, it is also possible to crush into a substantially circular shape to form a depression. Thus, when crushing into a substantially circular shape, a depression is formed over a wide range in the joining direction, which is useful in that the strength of the joining portion can be increased.

Further, as shown in FIGS. 19 to 21, it is also possible to form a depression by crushing in a band shape so as to be wider on the side away from the joint portion. Then, since more meat can be efficiently gathered from the side separated from the seaming part toward the seaming part, it is easy to make the opposed convex part and concave part closely adhere at the seaming part. Will be useful. Further, FIGS.
As shown in the figure, it is also possible to make the band wider at the boundary of the joint portion and crush it into a band so as to provide a recess so that narrow portions and wide portions are alternately provided on the side away from this boundary. . Then, a wide recess can be formed in the joining direction, and more meat can be efficiently gathered from the side away from the joining portion toward the joining portion, so that the strength of the joining portion Is useful in that it is possible to effectively increase In FIGS. 16 to 24, the depressions of the respective shapes are added in the form of being added to the streaks. However, since such a configuration is merely an example, all the crushed portions except for the streaks are used. Can be applied. For example, as shown in FIG. 25, only a substantially circular depression may be used. As shown in FIG. 26 and FIG. 27, when the hollow is formed in a substantially circular shape, the hollow is formed over a wide area in the seaming direction, and the amount of meat approaching the seamed portion is increased. This is particularly useful when it is possible.

Further, in this embodiment, only the case where the metal bracket 12 is welded to the metal frame 11 has been described. However, the present invention is not limited to the welding mode, and may be any type shown in FIGS. The strength can be similarly secured in the welding mode. As shown in FIG. 28, when welding to the metal pipe 50 along the bent portion of the metal bracket 12, when the welded portion 51 cools down, as shown in FIG. An external force is applied in a direction in which the sides are separated from each other. FIG.
As shown in FIG. 0, even when welding to the metal panel 60 along the bent part of the metal bracket 12, when the welded part 61 is cooled, as shown in FIG. An external force is applied in a direction in which the respective sides are separated from each other.

However, as described above, since the tensile strength at the joint portion of the metal bracket 12 is ensured, deformation is suppressed. Further, as shown in FIGS. 32 and 33, when the metal bracket 12 is welded along the small diameter metal members 70 and 80, FIG.
As shown in FIG. 35 and as FIG. 35 shows, when the welded portions 71 and 81 are cooled, an external force is applied in a direction in which the engaged sides are brought into contact with each other. However, since the tensile strength at the joint portion of the metal bracket 12 is ensured, deformation is suppressed.

The metal bracket 12 is manufactured at the time of manufacture.
As shown in FIG. 36, punching is performed while being supported by each support portion 91 extending from the band body 90. Then, as shown in FIG. 3, after being bent, each side A,
B are joined together while being pressed into each other,
It is cut off at the boundary position (a progressive joint). In this case, since the metal plate material is cut off from the supporting portion 91 after being bent, it is possible to cut off the upper end surface shown in FIG. That is, when the metal plate is cut off before the bending process, the shape error of the metal plate after the punching process is taken into consideration, and the upper end surface shown in FIG. This is because the excision must be performed at a position slightly offset from the boundary position with the support site 91 toward the band body 90.

Therefore, after the side edges A and B are joined, it is not necessary to polish the cut surface of the metal bracket 12, so that the above manufacturing method is useful in that the production efficiency can be improved. Thus, the left and right sides A,
When the metal bracket 12 is formed by engaging each of the protrusions and the notches provided in B with each other, the portions P to S straddling the adjacent protrusions are crushed in a streak-like manner in the thickness direction to form notches. Then, the flesh pushed away from the notches P to S is supplied around each projection to enhance the adhesion between the projections to realize a strong joint, and a root portion of the projection sandwiched from the joining direction. Is designed to be twice as large as the width of the root portion of the projection on the side to be sandwiched, thereby giving sufficient strength to the joint portion. For this reason, it is possible to suppress a change in the inner diameter dimension caused by an external force applied in association with cooling of the welding portion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a support structure of a headrest using a metal bracket according to the present embodiment.

FIG. 2 is a plan view showing a metal plate before bending a metal bracket.

FIG. 3 is a plan view showing a joint portion after being formed into a pipe shape.

FIG. 4 is a plan view showing a state in which a projection provided on a headrest support is inserted into a notch formed in an upper opening of a metal bracket.

FIG. 5 is an explanatory view showing an external force applied to a metal bracket when welded to a metal frame.

FIG. 6 is a perspective view showing an appearance of a headrest support.

FIG. 7 is an explanatory view showing a resin spring when a headrest support is inserted into a metal bracket.

FIG. 8 is a cross-sectional view showing a resin spring before a headrest support is inserted into a metal bracket.

FIG. 9 is a sectional view showing the resin spring when the headrest support is inserted into the metal bracket.

FIG. 10 is an explanatory diagram showing an external force applied to a metal bracket when welded to a metal frame provided on a seat back of a second seat or a third seat.

FIG. 11 is a plan view showing a joint portion of a metal bracket according to a modification.

FIG. 12 is a plan view showing a joint portion of a metal bracket according to another modification.

FIG. 13 is a plan view showing a joint portion of the metal bracket shown in FIG. 11 when a notch is added.

FIG. 14 is a plan view showing a joint portion of the metal bracket shown in FIG. 12 when a notch is added.

FIG. 15 is a plan view showing a joint portion of the metal bracket according to the embodiment when a notch is added.

FIG. 16 is a plan view showing a joint portion of the metal bracket according to the present embodiment when a substantially circular depression is added.

FIG. 17 is a plan view showing a joint portion of the metal bracket shown in FIG. 11 when a substantially circular depression is added.

18 is a plan view showing a joint portion of the metal bracket shown in FIG. 12 when a substantially circular depression is added.

FIG. 19 is a plan view showing a joint portion of the metal bracket according to the present embodiment when a band-shaped depression is added.

20 is a plan view showing a joint portion of the metal bracket shown in FIG. 11 when a band-shaped depression is added.

FIG. 21 is a plan view showing a joint portion of the metal bracket shown in FIG. 12 when a band-shaped depression is added.

FIG. 22 is a plan view showing a joint portion of the metal bracket according to the present embodiment when a band-shaped depression of another shape is added.

FIG. 23 is a plan view showing a joining portion of the metal bracket shown in FIG. 11 when a band-shaped depression of another shape is added.

FIG. 24 is a plan view showing a joint portion of the metal bracket shown in FIG. 12 when a band-shaped depression of another shape is added.

FIG. 25 is a plan view showing a situation when seaming is performed only with substantially circular depressions.

FIG. 26 is an enlarged view showing a configuration in a part X of FIG. 25;

FIG. 27 is a sectional view showing a section YY in FIG. 26;

FIG. 28 is a plan view showing a situation when pipe type welding is performed.

FIG. 29 is a side view showing a situation when pipe-type welding is performed.

FIG. 30 is a plan view showing a situation when panel type welding is performed.

FIG. 31 is a side view showing a situation when panel type welding is performed.

FIG. 32 is a plan view showing a situation when wire-type welding is performed.

FIG. 33 is a plan view showing a situation when another wire type welding is performed.

FIG. 34 is a side view showing a situation when the wire type welding shown in FIG. 29 is performed.

FIG. 35 is a side view showing a situation when the wire type welding shown in FIG. 30 is performed.

FIG. 36 is a plan view showing a metal plate material after a punching step.

FIG. 37 is a perspective view showing a headrest support structure using a metal bracket according to a conventional example.

FIG. 38 is an explanatory view showing an external force applied to the metal bracket when the metal bracket according to the conventional example is welded to a metal frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Seat back 11 ... Metal frame 11a ... Welding part 12 ... Metal bracket 12a ... Notch 13 ... Metal bracket 14 ... Metal frame 14a ... Welding part 20 ... Headrest 21, 22 ... Headrest stay 30 ... Headrest support 31 ... locking claw 32 ... resin spring 32a ... flexible part 32b ... projection 33 ... resin spring 33a ... flexible piece 40 ... headrest support 50 ... metal pipe 51 ... welding part 60 ... metal panel 61 ... welding part 70 ... metal Member 71 ... Welding part 80 ... Metal member 81 ... Welding part 90 ... Band 91 ... Support part A ... Left side A1, A3, A5, A7 ... Notch A2, A4, A6 ... Protrusion B ... Right side B1, B3 B5, B7: Projection B2, B4, B6: Notch C: Upper side D: Lower side P to S: Notch

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[Procedure amendment]

[Submission date] December 1, 2000 (200.12.
1)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG. 25

[Correction method] Change

[Correction contents]

FIG. 25

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) // B60N 2/48 B60N 2/48

Claims (10)

[Claims] 1. A metal plate comprising: a pair of side edges of a metal plate material having a concave / convex shape which meshes with each other so as to be able to be prevented from coming off; Cylindrical body. 2. The metal cylinder according to claim 1, wherein the concave and convex shapes formed on each side are formed so that the shortest distances in the joining direction are substantially the same. Cylindrical body. 3. The metal cylindrical body according to claim 1, wherein the convex and concave portions are opposed to each other in a state where the concave and convex shapes formed on each side are engaged with each other. A metal cylinder characterized by being crushed in the thickness direction. 4. The metal cylinder according to claim 3, wherein the metal cylinder is crushed in a streak shape so as to extend over the convex portion and the concave portion. 5. The metal cylindrical body according to claim 4, wherein the notch is crushed in a streak shape while being released in an oblique direction with respect to a boundary between the convex portion and the concave portion. Metal cylinder. 6. The metal cylindrical body according to claim 3, wherein the metal cylindrical body is crushed into a substantially circular shape so as to extend over the convex part and the concave part. 7. The metal cylindrical body according to claim 3, wherein the metal member is formed in a band shape so as to extend over the convex portion and the concave portion and to be wide on a side separated from a boundary between the convex portion and the concave portion. A metal cylindrical body characterized by being crushed to form a depression. 8. The metal cylindrical body according to claim 3, wherein the metal cylinder is wide so as to extend over the convex portion and the concave portion and to be wide at a boundary between the convex portion and the concave portion, and to be separated from the boundary. A metal cylindrical body characterized in that it is crushed in a band shape to form a depression so that a narrow portion and a wide portion are alternately provided. 9. A metal plate material in which a plurality of protrusions meshing with a pair of side edges so as to be able to be detached from each other are formed so that the shortest distances in the joining direction are substantially equal to each other. While being included in the wall, each side is opposed to each other and each projection is meshed, crushed in a streak shape over the projections and scored, seamed together and formed into a substantially square pipe shape, mounted on automobiles Above the inside of the seat back of the first seat, the axis is oriented in a substantially vertical direction with respect to a substantially pipe-shaped metal frame arranged while orienting the axis in a substantially horizontal direction, and With the metal frame substantially in close contact with the substantially flat wall surface, the bent portion of the metal cylinder abutting on the metal frame wall surface is welded to the same wall surface, and Metal bracket, characterized in that the substantially cylindrical headrest support for supporting a headrest stay which projects vertically downward is substantially inserted from the vertically upward. 10. A metal plate material in which a plurality of projections meshing with a pair of side edges so as to be able to be locked from each other are formed so that the shortest distances in the joining direction are substantially the same. While being included in the wall, each side is opposed to each other and each projection is meshed, crushed in a streak shape over the projections and scored, seamed together and formed into a substantially square pipe shape, mounted on automobiles In the upper part of the seat back of the second or third seat, the axis is oriented substantially vertically with respect to a pair of pipe-shaped metal frames arranged substantially in parallel at a predetermined interval while orienting the axis in a substantially horizontal direction. Straddle each metal frame while orienting it in the direction, and abut on the wall surface of the metal cylindrical body in a state where the joint portion is substantially in close contact with the substantially flat wall surface of the metal frame. A bent portion of the metal frame is welded to the wall surface, and a substantially cylindrical headrest support for supporting a headrest stay projecting substantially vertically downward from the headrest is inserted from substantially vertically above. bracket.