JP3485714B2 - Seat belt hanger - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt (waving belt), which is provided so as to be able to be paid out, such as a three-point type seat belt for an automobile, and which is provided so as to stop the feeding in an emergency. In the middle of
The present invention relates to a seatbelt suspending tool which is folded back and slidably suspended.

[0002]

2. Description of the Related Art In recent years, in order to ensure the safety of an occupant in the event of a collision in an automobile, in addition to a two-point type seat belt that holds only the waist, a three-point type that holds the occupant's chest part in a crossing manner Seat belts have been adopted.

FIG. 20 (a) is a perspective view of the interior of the automobile 1 shown for explaining the structure of the three-point seat belt 70. The three-point seat belt is attached to all of the front seats and the rear seats of the automobile 1. However, in order to simplify the description, an example in which the seat belt is provided only in the driver's seat 2 will be described.

The three-point seat belt 70 includes a first anchor 71 provided under the center pillar 3 and a second anchor 7 attached to the floor between the driver's seat 2 and the passenger seat 4.
2 and a third anchor 73 provided on the upper part of the center pillar 3 so as to be bridged. The three-point seat belt 70 has one end attached to the first anchor 71 and the other end folded back at the third anchor 73 to form a retractor (not shown) built in the center pillar 3. The waving belt 74 that is wound up
And a fixed belt 75 having one end attached to the second anchor 72 and the other end having a buckle 77. A buckle 77 is provided in the middle of the waving belt 74.
A tongue portion 76 that locks to is provided.

FIG. 20 (b) is a perspective view showing a conventional seat belt suspension 78 attached to the third anchor 73. As shown in FIG. This seat belt suspension 78 is shown in FIG.
As shown in (c), a base member 80 made of a steel plate (made of a metal plate) having a bolt insertion hole 81 and a long hole 82, and the periphery of the long hole 82 of the base member 80 are covered, and A cover member 90 made of synthetic resin that forms a seat belt insertion hole 91 is provided. The long hole 82 is shown in FIG.
As shown in FIG. 5, the entire periphery of the base member 80 is punched at a right angle. Further, as shown in FIG. 21, the long hole 82 has long edge portions 82a and 82b facing each other and these long edge portions 82a and 8b.
It is formed by short edge portions 82c and 82d formed so as to be curved and continuous with both end portions of 2b. And each long edge part 82a, 82b and short edge part 82c, 8
As described above, 2d is formed substantially perpendicular to the surface of the base member 80. Further, as shown in FIG. 21, the seat belt insertion hole 91 has the long edge portions 82a and 8a.
The folded sliding portion 91a of the waving belt 74 is formed so as to open corresponding to the 2b and the short edge portions 82c and 82d, and to extend along the one long edge portion 82a.

In the seat belt suspension 78 constructed as described above, it is fixed to the third anchor 73 by the bolt inserted in the bolt insertion hole 81, and the waving belt 74 is slid at the folded back sliding portion 91a. Suspend freely.

[0007]

However, in the seat belt suspension 78, the waving belt 74 is slidably suspended by the folded slide portion 91a in the normal state as shown in FIG. . However, when the waving belt 74 is suddenly pulled, as shown in FIG. 22, the waving belt 74 moves to one short edge portion 82c side of the long hole 82, or as shown in FIG. It may be concentrated on the edge portion 82c side. In particular, when the waving belt 74 is concentrated on the side of the short edge portion 82c, the force acting on the covering member 90 from the base member 80 also becomes large. Therefore, it is necessary to reduce this force.

Therefore, the present invention reduces the force acting on the covering member from the base member even if the seat belt is concentrated on one end side in the longitudinal direction of the long hole. An object of the present invention is to provide a seat belt suspension device that can be used.

[0009]

In order to achieve the above-mentioned object, the present invention is designed so that a midway portion of a seat belt which is provided so as to be able to be paid out and which is provided so as to stop the paying out in an emergency, is folded back. And a seat belt suspending device for slidably suspending the base member, the base member made of a metal plate having a long hole, and a portion corresponding to the long hole of the base member covering at least the periphery of the long hole. A cover member made of synthetic resin that forms a seat belt insertion hole in the
The longitudinal end of the elongated hole is on one surface side of the base member.
And bulging to the other surface side and folding the seat belt.
To form a smooth curved surface along the returning direction
It is characterized by being configured in .

The base members are made of high-strength steel.
Constructed from cold-worked material
Is preferred .

According to the present invention, the longitudinal end portion of the elongated hole bulges toward one surface side and the other surface side of the base member.
Along with the seat belt folding direction.
Since it is formed with a smooth curved surface, the stress concentration of the covering member that contacts the above end is significantly larger than that of the conventional example in which the long hole is formed so as to penetrate at a right angle to the base member.
While it is possible to reduce, the covering member from the end portion
It is possible to reduce the surface pressure acting on . Therefore, even if the seat belt is concentrated in the longitudinal direction of the long hole, for example, on one end side in a concentrated manner, the force acting on the covering member from the end portion is dispersed, so that the base member The force acting on the covering member can be relieved.

On the other hand, the base member is usually made of carbon steel such as JIS S55C (SAE1045-SAE).
1050), it is necessary to improve the strength by performing heat treatment after molding with a press.
Therefore, there is a problem that it takes a lot of manufacturing man-hours.
Moreover, the heat treatment causes the base member to bend. Therefore, if the base member is put into a mold and the covering member is insert-molded, it is unnecessary to correct the base member into a normal shape. The force will act. Therefore, there is a problem that the life of the mold is shortened. Further, when the base member is formed of the material of S55C, there is a risk that hydrogen embrittlement may occur in the base member during the plating process. Therefore, a heat treatment for removing hydrogen embrittlement must also be performed, which results in a very large number of manufacturing steps.

However, in the present invention, since the base member is constructed by cold working a material of high strength steel,
It is possible to obtain a base member having extremely good surface finish accuracy and dimensional accuracy. Therefore, even when the base member is put into the mold for insert molding, an abnormal force does not act on the mold from the base member. Therefore, the life of the mold can be improved. Moreover, since it is work-hardened by cold working and sufficient strength can be obtained, it is not necessary to heat-treat the base member.

Therefore, the number of manufacturing steps can be reduced. Moreover, since it is made of high-strength steel, there is no concern about hydrogen embrittlement after plating, and heat treatment for removing hydrogen embrittlement is not necessary. Therefore, the number of manufacturing steps can be further reduced, and the cost can be reduced.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment will be described with reference to FIG. However, elements common to the constituent elements of the conventional example shown in FIGS.
The description is omitted.

FIG. 1 (a) is a perspective view showing the structure of the seat belt suspension 10 attached to the third anchor 73 of the center pillar 3 of the automobile described in FIG. 20 (a). FIG. 1B is a front view showing the base member 20 of the seat belt suspension 10, and FIG. 1C is a front view of FIG.
It is sectional drawing which follows the IV-IV line.

The seat belt suspension 10 is formed by molding a base member 20 and a covering member 30 as shown in each drawing of FIG. The base member 20 is formed by punching out a steel plate (metal plate) material having a thickness of about 3 mm and performing press working, and includes a mounting portion 20A and a seat belt holding portion 20B. Seat belt holder 20
As shown in FIG. 1C, B is formed by being bent at a predetermined angle (about 30 degrees) with respect to the mounting portion 20A. A bolt insertion hole 21 is formed in the mounting portion 20A, and a long hole 22 for inserting a waving belt (seat belt) 74 (FIG. 1 (c)) is formed in the seat belt holding portion 20B. There is.

As shown in FIG. 1B, the long hole 22 is formed so as to be continuous with the long edge portions 22a and 22b facing each other and both end portions of these long edge portions 22a and 22b. It is formed by curved short edges 22c and 22d. Each of the long edge portions 22a and 22b has a shape punched out substantially at right angles to the surface of the base member 20. In addition, the short edge portions 22c and 22d are shown in FIG.
As shown in (c), the cross section is formed in an elliptical shape by the bulging portions 22e bulging on one surface side and the other surface side of the base member 20, respectively.

That is, the short edges 22c and 22d are formed into a smooth curved surface along the direction in which the waving belt 74 is folded back by the bulging portion 22e which bulges toward one surface side and the other surface side of the base member 20. Is formed in. In addition, in this embodiment, each bulging portion 22e is also formed continuously at both ends of the long edge portions 22a and 22b adjacent to the short edge portions 22c and 22d. That is, each bulging portion 22e is formed in a portion where the waving belt 74 is concentrated when the waving belt 74 is suddenly pulled.

The bulged portions 22e are formed by cold working, and a part of the base member 20 is bent to one surface side, and the bent portion is moved to the other surface side. At the same time, it is formed by arranging it into a curved surface. Therefore, each bulging portion 22e is formed by the base member 2
The amount of swelling from 0 is large and the strength is excellent.

The covering member 30 is a long hole 2 of the base member 20.
It is molded so as to cover the periphery of 2,
A portion that opens so as to correspond to the long hole 22 is a seat belt insertion hole 31. In the seat belt insertion hole 31, a portion along the long edge portion 22a located at a position distant from the bolt insertion hole 31 serves as a folded back sliding portion 31a that folds back the waving belt 74 and slidably supports it. There is.

In addition, around the bolt insertion hole 21 is shown in FIG.
As shown in (a), protrusions T are formed so as to protrude at a predetermined interval. When the seat belt suspension 10 is attached to the third anchor 73 (see FIG. 20 (a)) of the center pillar 3 of the automobile with the bolt (not shown), the protrusion T acts as a rotation stopper for the bolt. , The effect of the conventional washer is demonstrated. As a result, the seat belt suspension 1
When attaching 0, a washer that is normally used is not necessary, so that the number of parts can be reduced.

In the seat belt suspension 10 constructed as described above, the short edge portions 22c and 22d of the long hole 22 and the end portions of the long edge portions 22a and 22b adjacent thereto are folded back. Since they are formed in a smooth curved surface along the direction, these short edge portions 22
The stress concentration of the covering member 30 in contact with the ends of the c and 22d and the long edge portions 22a and 22b can be made extremely small.
Therefore, even if the waving belt 74 is concentrated on the short hole 22c side of the long hole 22, for example, the force acting on the covering member 30 from the short edge 22c can be dispersed. The force acting on the covering member 30 from the base member 20 can be relaxed.

Further, the bulging portion 22 is provided at the end portions of the short edge portions 22c and 22d and the long edge portions 22a and 22b adjacent thereto.
Since e is formed, the surface pressure acting on the covering member 30 from the ends of the short edges 22c and 22d and the long edges 22a and 22b can be reduced. Therefore, the force acting on the covering member 30 from the base member 20 can be further reduced.

Next, a second embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. However, elements common to the first embodiment shown in FIG. 1 are assigned the same reference numerals and explanations thereof are omitted. The difference between the second embodiment and the first embodiment is that the bulging portion 22e is formed so as to bulge only on one surface side of the base member 20.

The bulging portion 22e is similar to the first embodiment in that it extends from both ends of the long edge portions 22a and 22b to the short edge portion 22.
c and 22d are formed so as to be continuous with each other. The portion having the bulging portion 22e is formed into a smooth curved surface along the direction in which the waving belt 74 is folded back. The bulging portion 22e is formed by cold working, and is formed by bending a part of the base member 20 to one surface side and arranging the bent portion into a curved shape. Therefore, the bulging portion 22e is
The amount of bulging from the base member 20 is large, and the strength is excellent.

The seat belt suspension 10 constructed as described above also has the same effects as those of the first embodiment.

In the first and second embodiments described above, when the waving belt 74 is suddenly pulled, the waving belt 74 is not used.
Although the bulging portion 22e is formed at the end portions of the short edge portions 22c and 22d where the particles gather intensively and the long edge portions 22a and 22b that are continuous with the short edge portions 22c and 22d. , The short edge portions 22c, 22d and the end portions of the long edge portions 22a, 22b which are continuous with these, as shown in FIG.
Alternatively, the waving belt 74 may be formed into a smooth curved surface along the direction in which the waving belt 74 is folded back. However, when the bulging portion 22e is not provided, the radius of curvature of the curved surface becomes small, so that the stress concentration of the covering member 30 in contact with the short edge portions 22c, 22d and the like becomes large. Moreover, the surface pressure acting on the covering member from the short edge portions 22c, 22d and the like also becomes large. Therefore, the short edges 22c, 22d, etc.,
It is preferable to provide the bulging portion 22e.

Also, if the waving belt 74 is not concentrated in a short area, the short edge portions 22a, 22b.
Even at the ends of the long edges 22a and 22b, the bulging portion 22
It goes without saying that it is not necessary to form e or to form a curved surface.

Next, a third embodiment of the present invention will be described with reference to FIG.
~ It demonstrates with reference to FIG. However, elements common to the constituent elements of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. The difference between the third embodiment and the first embodiment is that the longitudinal ends of the elongated holes 22 are largely open.

That is, the short edge portions 22c, 22 of the long hole 22.
d is formed by an arc having a diameter larger than the dimension between the long edge portions 22a and 22b. In addition, this short edge portion 22c,
22d may be formed into an elliptical or other curved surface.
However, for example, when it is formed by an elliptical curved surface, it is preferable to arrange the ellipse so as to be vertically elongated in FIG.

Further, the short edges 22c and 22d of the long hole 22 and the long edges 22a and 22b adjacent to these, or the entire circumference of the long hole 22 are in the direction in which the waving belt 74 is folded back, as shown in FIG. Is formed so as to smoothly curve along.

Further, as shown in FIG. 3, the base member 20 is provided with a step portion 24 formed at a boundary portion 23a of the outer peripheral edge portion 23 with the covering member 30 so as to be one step lower than the outer peripheral edge portion 23. Has been. The step portion 24 is formed substantially at a right angle to the outer peripheral edge portion 23, and is formed at a height such that the surface of the covering member 30 and the surface of the outer peripheral edge portion 23 are substantially flush with each other. There is. That is, the outer peripheral edge portion 23 of the base member 20 is in a state in which the portion on the covering member 30 side is formed lower by the thickness of the covering member 30 by the step portion 24.

In the seat belt suspension 10 constructed as described above, since the radius of curvature of the short edges 22c and 22d is large, stress concentration on the short edges 22c and 22d can be relaxed. Therefore, the short edge portions 22c, 22
Since the stress generated in d can be reduced, the short edges 22c and 22d against the force from the waving belt 74 can be reduced.
The strength of the base member 20 can be improved, and the strength of the base member 20 can be substantially improved. Moreover, the long hole 22
Since the interval between the long edge portions 22a and 22b can be narrowed, the width W1 of the portion along the long edge portion 22a, that is, the width W1 of the portion that holds the waving belt 74 can be set to the portion of the short edge portions 22c and 22d. Can be wider than the width W2. Therefore, the strength of the portion along the one long edge portion 22a against the force from the waving belt 74 can also be improved.

Further, since the short edge portions 22c and 22d of the long hole 22 and the long edge portions 22a and 22b adjacent to these, or the entire circumference of the long hole 22 come into contact with the covering member 30 with a smooth curved surface, It is possible to reduce stress concentration in all portions of the covering member 30 that are in contact with the long holes 22. Therefore, the strength can be improved in all portions of the covering member 30 along the elongated hole 22. In addition, even if the covering member 30 is damaged, the elongated hole 22 is formed in a smooth curved surface along the direction in which the waving belt 74 is folded back. It is possible to prevent the long holes 22 from being hit and damaged.

Further, the covering member 30 is integrally formed with the base member 20 by so-called insert molding,
Since the outer peripheral edge portion 23 of the base member 20 is provided with the step portion 24 set to be one step lower on the covering member 30 side, it is possible to prevent the resin from leaking from the boundary portion 23a along the outer peripheral edge portion 23 during insert molding. can do. Therefore, it is possible to prevent burrs from being generated by the covering member 30 at the boundary portion 23a between the base member 20 and the covering member 30.

Moreover, since the resin leakage can be prevented as described above, the conventional resin leakage has been prevented by setting a large mold clamping force. There is no need to set a large value. Therefore, the durability of the mold can be improved. Besides, the same operational effects as the first embodiment are obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. However, the third shown in FIG. 3 and FIG.
The same reference numerals are given to the same elements as the constituent elements of the embodiment, and the description thereof will be omitted. This fourth embodiment is the third
The difference from the embodiment is that a bulging portion 22e is provided along one long edge portion 22a of the long hole 22.

That is, in the long edge portion 22a of the long hole 22 on the side where the waving belt 74 is folded back, as shown in FIG.
(C) and a bulging portion 22e as shown in FIG. 2 are provided. The bulging portion 22e can improve the strength of the portion of the long edge portion 22a on which the force of the waving belt 74 acts, and is the same as the bulging portion 22e shown in the first and second embodiments. The same effect is obtained.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. However, the third shown in FIG. 3 and FIG.
The same reference numerals are given to the same elements as the constituent elements of the embodiment, and the description thereof will be omitted. This fifth embodiment is the third
The difference from the embodiment is that the short edge portions 22c, 2 of the long hole 22 are
2d and bulging portions 22e are provided at the end portions of the long edge portions 22a and 22b adjacent thereto. The bulging portion 22e is configured by the same as that shown in FIG. 1 (c) and FIG. 2, and the first embodiment and the second embodiment
The same effect as that of the embodiment is achieved.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. However, the third shown in FIG. 3 and FIG.
The same reference numerals are given to the same elements as the constituent elements of the embodiment, and the description thereof will be omitted. This sixth embodiment is the third
The point different from the embodiment is that the entire circumference of the long hole 22 is
The point is that the bulging portion 22e is provided. And the bulging part 22e is comprised by what is shown in FIG.1 (c) or FIG.2, and 1st Embodiment, 2nd Embodiment, 4th Embodiment, 5th. The same effect as that of the embodiment is achieved.

Next, a seventh embodiment of the present invention will be described with reference to FIG.
~ It demonstrates with reference to FIG. However, elements common to the constituent elements of the third embodiment shown in FIGS. 3 and 4 are designated by the same reference numerals, and description thereof will be omitted. The seventh embodiment differs from the third embodiment in that the short edge portion 2 of the long hole 22 is different from the third embodiment.
This is the point that the reinforcing portion 22f is provided along the outside of 2c and 22d.

That is, the reinforcing portion 22f is the same as that shown in FIGS.
As shown in FIG. 5, the seat belt holding portion 20B is formed so as to be raised on one surface side. Further, as shown in FIG. 10, the reinforcing portion 22f may be formed so as to bulge on one surface side and the other surface side. By providing the reinforcing portion 22f, it is possible to improve the strength of the portion of the base member 20 around the short edge portions 22c and 22d.

Next, FIG. 1 shows an eighth embodiment of the present invention.
This will be described with reference to 1 (a). However, elements common to the constituent elements of the third embodiment shown in FIGS. 3 and 4 are designated by the same reference numerals, and description thereof will be omitted. The eighth embodiment differs from the third embodiment in that a reinforcing portion 22f is provided along a portion outside one long edge portion 22a of the long hole 22.

That is, in the long edge portion 22a of the long hole 22 on the side where the waving belt 74 is folded back, a reinforcing portion 22f as shown in FIGS. 9 and 10 is provided along the lower portion of the long edge portion 22a. It is provided. By providing the reinforcing portion 22f, the strength of the portion of the base member 20 that holds the waving belt 74 can be improved.

In each of the third to eighth embodiments, as shown in FIG. 11B, the step portion 24 is formed substantially at right angles to the outer peripheral edge portion 23. 24
Is formed so as to bite into the inside of the outer peripheral edge portion 23 as shown in FIG. 11C, or is formed so as to be inclined toward the covering member 30 side as shown in FIG. 11D. You may do it. However, in order to prevent the resin from leaking along the outer peripheral edge portion 23, as shown in FIG. 11B, the step portion 24 is formed substantially at right angles to the outer peripheral edge portion 23, or the step portion 24 is formed as shown in FIG. As shown in c), it is preferable that the outer peripheral edge portion 23 is formed so as to bite obliquely inside.

In each of the third to eighth embodiments, the height of the stepped portion 24 is set so that the surface of the covering member 30 and the surface of the outer peripheral edge portion 23 are substantially flush with each other. However, in order to prevent the resin from leaking along the outer peripheral edge portion 23, the height of the stepped portion 24 is set so that the surface of the outer peripheral edge portion 23 is slightly higher than the surface of the covering member 30. It is preferable.

Next, a ninth embodiment of the present invention will be described with reference to FIG.
2 will be described. However, elements common to the constituent elements of the first embodiment shown in FIG.
The description is omitted. The difference between the ninth embodiment and the first embodiment is that the bulging portion 22e is provided along the portion of the facing short edges 22c and 22d that face each other.

That is, bulging portions 22e as shown in FIG. 12B or 12C are provided at the portions of the short edges 22c and 22d facing each other. This bulge 22
e has a shape similar to that shown in FIGS. 1 (c) and 2. However, the bulging portion 22e shown in this embodiment is formed so that the vicinity of the central portion in the vertical direction of each short edge portion 22c, 22d is the highest, and gradually lowers toward the upper end side and the lower end side. Is formed.

The bulging portion 22e is shown in FIG.
And the same effects as those shown in FIG. Moreover,
Since the bulging portion 22e is not provided so much, there is an advantage that the manufacturing is simple. Furthermore, since the bulging portion 22e can reinforce the portions along the respective short edge portions 22c and 22d, the respective short edge portions 2 against the force of the waving belt 74.
The strength of the portion along 2c and 22d can be improved. The bulging portion 22e shown in FIG. 1C and FIG. 2 can also reinforce the portions along the short edge portions 22c and 22d.

Next, a tenth embodiment of the present invention will be described with reference to FIG. However, elements common to the constituent elements of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. This tenth embodiment is the first
The difference from the embodiment is that the opposite short edge portions 22c, 22
This is a point where the portions of d that are facing each other are curved so as to approach each other.

That is, as shown in FIG. 13A, the portions of the short edges 22c and 22d facing each other are smoothly curved so that the central portions of the facing portions are most raised. And the cross sections of the short edge portions 22c and 22d are
As shown in FIG. 13B, the base member 20 is formed so as to smoothly curve from one surface to the other surface.

As shown in FIG. 13 (a), the lower long edge 22a on which the force of the waving belt 74 acts rises so as to curve smoothly from both ends toward the center. There is. That is, the long edge portion 2
The width W1 of the portion corresponding to the central portion of 2a has a short edge portion 22c,
It is formed wider than the width W2 of the portion corresponding to both ends located at 22d. In addition, the folded sliding portion 31a also has the long edge portion 2
It is formed along the line 2a so as to smoothly rise from both ends toward the center.

Since the facing portions of the short edge portions 22c and 22d are curved so as to approach each other, the short edge portion 2
The cross-sectional area of the portion along 2c and 22d is increased, so that each short edge portion 22 against the force of the waving belt 74 is increased.
The strength of the portion along c and 22d can be improved. Further, since the width W1 is formed larger than the width W2, the strength of the portion along the one long edge portion 22a against the force from the waving belt 74 can be improved.

Further, since the central portion of the folding sliding portion 31a is raised, when a force is applied to the waving belt 74, the waving belt 74 is expanded in the width direction and is brought into close contact with the folding sliding portion 31a. It will be. For this reason, the folded sliding portion 31a has one short edge portion 22c.
Alternatively, there is an advantage that it can be prevented from shifting to the other short edge portion 22d.

In the tenth embodiment described above,
Although the folding back sliding portion 31a is formed so as to be curved along the long edge portion 22a, the folding back sliding portion 31a is formed as shown in FIG.
As shown in, it may be formed to extend linearly in the longitudinal direction.

The base member 20 shown in the first to tenth embodiments is preferably formed by cold working using high-strength steel. As the high-strength steel, it is preferable to use one having the chemical composition shown in Table 1. Table 2 shows the test results of this high-strength steel.

[0058]

[Table 1]

[0059]

[Table 2]

By constructing the base member 20 by cold working using the high-strength steel, it is possible to obtain the base member 20 with extremely good surface finish accuracy and dimensional accuracy. Therefore, when the base member 20 is inserted into the mold for insert molding, the bending of the base member 20 does not exert an abnormal force on the mold from the base member 20. Therefore, the life of the mold can be improved. Moreover, since it is work-hardened by cold working and sufficient strength can be obtained, heat treatment is unnecessary. Therefore, the number of manufacturing steps of the base member 20 can be reduced. Further, since it is made of high-strength steel, there is no concern about hydrogen embrittlement after the plating treatment, and heat treatment for removing hydrogen embrittlement is not necessary. Therefore, the number of manufacturing steps can be further reduced, and the cost can be reduced.

Next, using high-strength steel, the base member 2
The process of cold working 0 will be described with reference to FIGS. The base member 20 manufactured by this cold working
Is substantially equivalent to the base member 20 shown in FIG. 2, and the bulging portion 22e projects only on one side. However, the long hole 22 formed by this cold working is
As for the portion without the bulging portion 22e, the portions shown in FIG.
It is formed into a curved surface as shown in (b).

The base member 20 is manufactured by a set of press machines that automatically and continuously perform the work of each process shown in FIGS.

First, while the high-tensile steel plate S wound into a coil, which is the material of the base member 20, is corrected into a flat shape,
Sequentially sent to the press machine.

Then, in the first step P1 (see FIG. 15), the slit S1 for separating the adjacent base members 20 to be molded is punched out and the positioning hole H1 is formed.
Punch out. At this time, necessary numbers and symbols are also pressed at the same time.

Next, in the second step P2, the prepared hole S2 for forming the elongated hole 22 is punched out. At this time, burrs are formed on the side where the prepared hole S2 is punched out.

Then, in the third step P3, the corner portion of the prepared hole S2 on the side where the burr is generated is pressed to finish the corner portion of the prepared hole S2 round. As a result, the burr generated in the second step is pushed in and removed.

Further, in the fourth step P4 (see FIG. 16),
The corner of the prepared hole S2 on the opposite side of the burr is pressed to finish the same corner round. Then, the third and fourth
The prepared hole S2 after passing through the steps has its entire circumference neatly formed into a curved surface as shown by the long edge portions 22a and 22b in FIG.

Next, in a fifth step P5, the portions corresponding to the short edge portions 22c and 22d of the long hole 22 in the prepared hole S2 are bent to form the convex shape S3 corresponding to the bulging portion 22e. At this time, the portion around the convex S3 is slightly curved in the protruding direction of the convex S3. That is, the convex S
The part around 3 becomes distorted.

Therefore, in the sixth step P6 (see FIG. 17),
The convex S3 is shaped so as to be flat. As a result, only the convex S3 is raised from the flat high-tensile steel plate S. At this time, the ridge S3 is rounded at the same time.

Next, in the seventh step P7, the convex S3 and other portions are finished into a smooth curved surface by pressing the surface along the prepared hole S2. As a result, the convex S3 portion becomes short edge portions 22c and 22d having the curved bulging portion 22e as shown in FIG. 2, and the other portions have the curved long edge portion 22a as shown in FIG. , 22b.

Then, in the eighth step P8 (see FIG. 18),
Holes S4 for molding the lower and upper parts of the base member 20 that are molded adjacent to each other are punched out.

Further, in the ninth step P9, the necessary holes S5 are punched out.

Next, the tenth step P10 (see FIG. 19)
Then, the bolt insertion hole 21 is punched out, and the outer peripheral edge portion 23 of the base member 20 is punched out. However, only the connecting plate S6 for connecting the adjacent base members 20 is left.

Then, in the eleventh step P11, the connecting plate S6
By separating the base member 20 from the adjacent base member 20,
The individually separated base member 20 is completed.

In the method of manufacturing the base member 20 configured as described above, since the bulging portion 22e is formed by bending the edge portion of the prepared hole S2, the bulging portion 22e is formed. Can be largely projected from the plate surface. Moreover, the bulging portion 22 is pressed by pressing the surface.
e and other parts can be neatly finished into a smooth curved surface. That is, since the edge portion of the long hole 22 can be neatly finished into a curved surface only with a press machine, it is not necessary to perform finishing processing (barrel polishing processing) in a separate process. Therefore, the cost can be reduced.

The amount of protrusion of the bulging portion 22e can be formed to be 0.2 to 0.5 times the plate thickness of the substrate 2. Therefore, the contact area between the elongated hole 22 and the covering member 30 can be increased, and the surface pressure on the covering member 30 can be reduced.

In addition to the step of forming the convex shape S3 in the fifth step P5 on one side and the step of pushing the convex shape S3 back to the other side, one and the other of the base member 20 are provided. It is possible to form the bulging portions 22e that respectively project to the sides. That is, the bulging portion 22e as shown in FIG. 1C can be formed. The amount of protrusion of each bulged portion 22e that occurs in this case can also be formed to be 0.2 to 0.5 times the plate thickness of the base member 20.

[0078]

As described above, according to the present invention,
Connect the longitudinal end of the long hole to one surface side of the base member and
The seat belt folds up while bulging to the other side.
Is it formed into a smooth curved surface along the direction
Al, than those formed to penetrate at right angles to the base member to the long hole as in the conventional example, one that can be significantly reduced stress concentration of the coating member in contact with the end portion
On the other hand, the surface pressure acting on the covering member from the above end is reduced.
You can Therefore, even if the seat belt is concentrated in the longitudinal direction of the long hole, for example, on one end side in a concentrated manner, the force acting on the covering member from the end portion is dispersed, so that the base member The force acting on the covering member can be relieved.

On the other hand, the base member is usually made of carbon steel, for example, about S55C (SAE1045-SAE105).
Since it is composed of 0), it is intended to improve the strength by performing heat treatment after molding by a press. Therefore, there is a problem that it takes a lot of manufacturing man-hours. Moreover, the heat treatment causes the base member to bend. Therefore, if the base member is put into a mold and the covering member is insert-molded, it is unnecessary to correct the base member into a normal shape. The force will act.
Therefore, there is a problem that the life of the mold is shortened. Further, when the base member is formed of the material of S55C, there is a risk of hydrogen embrittlement of the base member 80 during the plating process. Therefore, a heat treatment for removing hydrogen embrittlement must also be performed, which results in a very large number of manufacturing steps.

However, in the present invention, since the base member is constructed by cold working a material of high strength steel,
It is possible to obtain a base member having extremely good surface finish accuracy and dimensional accuracy. Therefore, even when the base member is put into the mold for insert molding, an abnormal force does not act on the mold from the base member. Therefore, the life of the mold can be improved. Moreover, since it is work-hardened by cold working and sufficient strength can be obtained, it is not necessary to heat-treat the base member.

Therefore, the number of manufacturing steps can be reduced. Moreover, since it is made of high-strength steel, there is no concern about hydrogen embrittlement after plating, and heat treatment for removing hydrogen embrittlement is not necessary. Therefore, the number of manufacturing steps can be further reduced, and the cost can be reduced.

[Brief description of drawings]

1A and 1B are views of a seat belt lifting device shown as a first embodiment of the present invention, in which FIG. 1A is a perspective view, FIG. 1B is a front view showing a base member, and FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 2 is a view of a seat belt suspension shown as a second embodiment of the present invention and is a sectional view corresponding to a sectional position along line IV-IV in FIG. 1 (b).

FIG. 3 is a front view showing a base member of a seat belt lifting device shown as a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of the seatbelt lifting device shown in FIG.
FIG. 7 is a sectional view taken along line VII-VII in FIG.

FIG. 5 is a front view showing a base member of a seatbelt lifting device shown as a fourth embodiment of the present invention.

FIG. 6 is a front view showing a base member of a seat belt lifting device shown as a fifth embodiment of the present invention.

FIG. 7 is a front view showing a base member of a seat belt lifting device shown as a sixth embodiment of the present invention.

FIG. 8 is a front view showing a base member of a seat belt lifting device shown as a seventh embodiment of the present invention.

FIG. 9 is a cross-sectional view showing a reinforcing portion of the seat belt suspension.

FIG. 10 is a cross-sectional view showing another example of the reinforcing portion of the seat belt suspension.

11A and 11B are views showing a base member of a seatbelt lifting device shown as an eighth embodiment of the present invention, in which FIG. 11A is a front view, FIG. 11B is an enlarged view showing a step portion, and FIG. [Fig. 4] is an enlarged view showing a first other example of the step portion, and (d) is an enlarged view showing a second other example of the step portion.

12A and 12B are views showing a base member of a seatbelt lifting device shown as a ninth embodiment of the present invention, in which FIG. 12A is a front view and FIG. 12B is a XX line of FIG. Cross-section view,
(C) is sectional drawing which shows the other example of (b).

FIG. 13 is a view showing a base member of the seat belt lifting device shown as the tenth embodiment of the present invention, (a)
Is a front view and (b) is a cross-sectional view taken along line YY of (a).

FIG. 14 is a front view showing another example of the base member of the seat belt suspension.

FIG. 15 is a plan view of the high-tensile steel plate showing first to third steps for manufacturing the base member of the seat belt suspension.

FIG. 16 is a plan view of the high-tensile steel plate showing fourth to fifth steps for manufacturing the base member of the seat belt suspension.

FIG. 17 is a plan view of the high-tensile steel plate showing sixth to seventh steps for manufacturing the base member of the seat belt suspension.

FIG. 18 is a plan view of the high-tensile steel plate showing steps 8 to 10 for manufacturing the base member of the seat belt suspension.

FIG. 19 is a plan view of the high-tensile steel plate showing steps 10 to 11 for manufacturing the base member of the seat belt suspension.

FIG. 20 is a view for explaining the structure of a three-point seat belt, (a) is a perspective view showing the entire structure of the same three-point seat belt, and (b) is a conventional seat belt lifting device. The perspective view shown, (c) is a sectional view taken along line ZZ of (b).

FIG. 21 is a front view showing a conventional seat belt suspension.

FIG. 22 is an explanatory view showing a problem of the seat belt suspension.

FIG. 23 is an explanatory view showing a problem of the seat belt suspension.

[Explanation of symbols]

10 Seat belt suspenders 20 Base member 22 long hole 22c, 22d End (short edge) 30 Cover member 31 Seat belt insertion hole 74 seat belt (waving belt)

Claims (2)

(57) [Claims] 1. Along with being provided so that it can be drawn out,
A seatbelt suspending tool that slidably suspends a midway portion of a seatbelt provided so as to stop feeding in an emergency, and a base member made of a metal plate having a long hole, Coating at least the periphery of the elongated hole of this base member,
A covering member made of synthetic resin for forming a seat belt insertion hole is provided at a portion corresponding to the long hole, and an end portion in the longitudinal direction of the long hole has one surface side of the base member.
And bulging to the other surface side and folding the seat belt.
Formed into a smooth curved surface along the returning direction
A seatbelt hanger characterized by being 2. The base member is made of a high-strength steel material and is cold-worked.
Contracts characterized by being formed by processing
The seat belt suspension according to claim 1 .