JP2001130374A - Manufacturing method of belt mounting metal fitting for seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently reduce a surface pressure working on a belt even if tension is applied to the belt. SOLUTION: This manufacturing method consists of a first drawing process b1 for forming a first stage projection part T1, a second drawing process b3 for protruding the first stage projection part T1 to form a second stage projection part T2, a third drawing process for protruding the second stage projection part T2 to form a third stage projection part T3, a piercing process punching a long hole corresponding part in the third stage projection part T3, a surface pressing process d for removing a shear edge part T3b, a forming process e for forming an opening edge 23a in a circumference wall part 23, a restriking process f for rounding the cross section of the circumference wall part 23, a double-sided projecting bar forming process g for forming projecting bars 611a, 611b from a restruck part 24, and a separating process j separating a belt mounting metal fitting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a belt mounting bracket for a seat belt device for mounting a belt end of an automobile seat belt to a fixed portion such as a vehicle body.

[0002]

2. Description of the Related Art Conventionally, a belt mounting bracket of this type is known as shown in FIG. That is, the belt mounting bracket is formed by forming the bolt hole 3 and the long hole 69 in the substrate (plate-like body) 2, and is fixed to a fixed portion such as a vehicle body via the bolt hole 3, and the long hole 69 is formed. The connection with the belt 13 is achieved.

The belt 13 is made of, for example, a strip-shaped narrow woven fabric woven of polyester fibers.
Is folded back at one of the long edges 691 to apply tension to the one long edge 691. The one long edge 691 is formed in a straight line.

[0004]

By the way, the long hole 69 is formed by a press, but burrs are generated at the corners on the side punched out by the press. If such burrs are left as they are, there is a possibility that the same action as a blade may occur. Therefore, usually, in a process different from the pressing process, the corners are rounded, or the corners are formed with PVC or polyethylene. The coating process is applied to cover the whole. For this reason, there has been a problem of an increase in cost due to such finishing and coating processes.

Further, as shown in FIG. 19, since the belt mounting member is formed by the plate-shaped substrate 2, the area of one long edge portion 691 for holding the belt 13 is small, so that the belt 13 is acted on. There is a problem that the surface pressure to be applied increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a belt attachment for a seat belt device capable of sufficiently reducing the surface pressure acting on the belt even when tension is applied to the belt. An object of the present invention is to provide a method for manufacturing a metal fitting.

[0007]

According to a first aspect of the present invention, there is provided a method of manufacturing a belt mounting bracket for a seat belt device formed by a plate-like body. The body (2) has a long hole (6) for inserting the belt (13), and the long hole (6) is one of the long edges facing each other (691).
Then, the belt (13) is turned back and the belt (1) is folded.
3), and at least one edge of the long edge (691) of the long hole (6) which receives the tension of the belt (13) has one end of the plate-like body (2). One protruding line (611a) and the other protruding line (6) protruding from the surface (22a) and the other surface (22b) of
11b) and a method for manufacturing a belt mounting bracket for a seat belt device, wherein the corners are rounded along the direction in which the belt (13) is folded back.
A first draw step (b1) of pressing and protruding a portion of the plate-like body (2) where the long hole (6) is to be formed to form a first step convex part (T1); A second draw step (b2) for further pressing the first-step protrusion (T1) protruded by (b1) to form a second-step protrusion (T2), and a second draw step (b2) )
A third draw step (b3) of further pressing the second-step protrusion (T2) protruded by the second step to form a third-step protrusion (T3); and a third draw step (b).
Piercing step (c) of punching a pilot hole (6a) of a long hole (6) in a portion corresponding to the long hole of the third stage convex part (T3) formed in 3).
And a face pressing step (d) of removing the shear edge portion (T3b) generated by the piercing step (c) by face pressing.
Forming step (d) for shaping the opening edge (23a) of the peripheral wall portion (23) formed around the pilot hole (6a) by being pressed in the surface pressing step (d) and protruding in each of the draw steps (6a). e) and the peripheral wall portion (2) of the pilot hole (6a) shaped by the forming step (e).
3) Restricting step (f) for rounding the cross-section by restriking, and restriking part (24) restriated in this restriking step (f) is projected on both sides to form a plate-like body (2). Protrusions (611a) (611b) on both sides
And a separating step (j) of separating the plate-like body (2) obtained by the double-sided protruding step (g) as a belt mounting bracket of a predetermined shape. It is characterized by having.

According to a second aspect of the present invention, there is provided a method of manufacturing a belt mounting bracket for a seat belt device formed of a plate-like body (2), wherein the plate-like body (2) includes a belt (13).
The belt (13) is folded back at one of the long edges (691) of the long edges facing each other. The long hole (6) is configured to receive the tension of the belt (13), and at least one long edge (691) of the long hole (6) that receives the tension of the belt (13) has a plate-like body (2). ) Protruding from one surface (22a) in ().
And a rounded corner along the direction in which the belt (13) is folded back, the method for manufacturing a belt mounting bracket for a seat belt device, wherein the long hole ( 6) A first draw step (b1) in which a portion forming the first step is pressed to protrude to form a first step protrusion (T1); and a first step protrusion () protruded in the first draw step (b1). T1) is further pressed to further protrude to form a second-stage protrusion (T2), and a second-stage protrusion (T2) protruded by the second draw process (b2). Is further pressed to further protrude to form the third-stage convex portion (T3), and the length of the third-stage convex portion (T3) formed in the third draw step (b3). Drill a pilot hole (6a) in the corresponding hole A piercing step (c), a face pressing step (d) for removing the shear edge portion (T3b) generated by the piercing step (c) by face pressing, and each of the draw steps which are face pressed by the face pressing step (d). The peripheral wall portion (2) protruded by the hole and formed around the pilot hole (6a).
3) a forming step (e) for shaping the opening edge (23a), and a restriking step for restoring the peripheral wall portion (23) of the pilot hole (6a) shaped in the forming step (e) to round the cross section. (F) one-sided projections (611a) formed on one surface of the plate-like body (2) by protruding one-sided projections of the restriking part (24) in the restriking step (f). Projecting step,
A separating step (j) of separating the plate-like body (2) obtained by the one-sided protruding step as a belt-mounting bracket of a predetermined shape.

In the invention according to claim 1,
Since the plate-shaped body is formed so as to have one ridge and the other ridge protruding from one surface and the other surface, the contact area of the belt contacting one long edge is increased. Therefore, the surface pressure of the belt can be reduced. Furthermore, since the corner of one long edge is formed round along the direction in which the belt is folded, damage to the belt at this corner can be prevented. Moreover, since the corners are rounded, and it is not necessary to coat the corners with a coating such as PVC or polyethylene, the cost required for such a coating can be reduced. That is, cost can be reduced.

In the present invention, in particular, the peripheral wall portion can be greatly protruded from the surface of the plate-shaped member by the first to third drawing steps, so that the peripheral wall portion is projected on both surfaces of the plate-shaped member. The one and the other protruding ridges formed so as to protrude can also largely protrude from each surface of the plate-like body. Accordingly, the contact area of the belt contacting one of the long edges becomes extremely large, so that the surface pressure of the belt can be reduced to an extremely small value.

The peripheral wall having a smooth edge formed by the face pressing step is further subjected to a forming step and a restriking step, and then one side and the other convex line are formed by a double-sided projecting step. Therefore, the surfaces of these ridges can be formed smoothly. That is, by removing the shearing edge portion, it is possible to prevent the crack from advancing from the minute V-shaped groove in the shearing edge portion in the forming step. Moreover, the forming process, the restoring process,
Since the one and the other ridges are gradually formed through the double-sided ridge forming step, the surfaces of these ridges can be finished smoothly.

Furthermore, since the corners of each ridge can be rounded in the above-described series of pressing steps, there is no need to perform finishing or coating in a separate step.
Therefore, cost can be reduced.

Also, the same effect as described above can be obtained in the second aspect of the invention. However, since the ridges need only be projected on one surface side of the plate-shaped body, the ridges may be configured to play the role of the one-sided ridge-forming step in the restriking step.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples with reference to FIGS. First, a first embodiment of the present invention will be described with reference to FIGS.

In FIG. 5, S is a vehicle body, D is a driver's seat, and 1 is a seat belt device. A shoulder belt retractor 11 is fixed to the vehicle body S, and a shoulder belt 12 is connected to the retractor 11. A belt mounting bracket A1 is fixed to the vehicle body S on one side of the seat D, and a waist belt 13 is connected to the belt mounting bracket A1. These shoulder belts 12
The waist belt 13 is formed by a single belt. A shoulder belt 12 is provided on the retractor 11 side and a waist belt 13 is provided on the belt mounting bracket A1 side with a tongue 14 provided in the middle as a boundary.

The tongue 14 is detachably connected to a buckle 15.
Is connected to another belt mounting bracket A2 via the connection belt 151.
Is to be connected to. This belt mounting bracket A
Reference numeral 2 is fixed to the vehicle body S on the opposite side of the belt mounting bracket A1 across the sheet D. Since these belt mounting brackets A1 and A2 have almost the same configuration,
The configuration will be described in detail while using the reference numerals of the belt mounting bracket A1.

As shown in FIGS. 1 and 2, the belt mounting bracket A1 is formed of a plate-like substrate (plate-like body) 2, and is slightly bent at a bent portion 2a to form a "-" shape. One side is a fixed plate portion 21 and the other side is a winding plate portion 22 with the bent portion 2a as a boundary.
Bolt holes 3 are formed in the fixing plate portion 21, and a plurality of curved ridges 31 are formed radially and equidistantly at the periphery of the bolt holes 3 (in the case of this embodiment). Are formed three). Each curved ridge 31 is formed by pressing one side 22a of the substrate 2 from the other side 2a.
It is formed by protruding on the 2b side. In addition, the curved ridge 3
The number of 1 is not limited, and may be configured to be provided radially finely like Kikuza. Although one surface 22a is the surface on the vehicle body S side in FIG. 2, it goes without saying that the vehicle body S side may be the other surface 22b. However, in this embodiment, the surface on the vehicle body S side is shown as one surface 22a.

As shown in FIG. 2, the bolt holes 3
The fixing bolt 5 is inserted, and the fixing bolt 5 and the nut 5
1, the board 2 is fixed to the vehicle body S. At this time, the curved ridge 31 acts in the same manner as a spring washer (spring washer), and also acts as a detent due to an increase in friction, thereby helping to securely fix the substrate 2 to the vehicle body S. On the other hand, there is no need to use a spring washer that has always been used in the past, and the required number of parts can be reduced.

On the other hand, the winding plate portion 22 of the substrate 2
Slot 6 for inserting and connecting one end of waist belt 13
Has been opened. The waist belt 13 is folded back at one long edge 691 in the long hole 6, and the one long edge 69
1 is applied with tension. One long edge portion 691 receiving the tension is curved such that the central portion in the longitudinal direction projects in the direction opposite to the direction in which the tension is applied. The waist belt 13 is formed by forming a belt-shaped narrow woven fabric in which polyester fibers are woven into a flat shape in the same manner as that shown in the conventional example. It is folded back at the long edge 691, and the folded back portion is sewn to the waist belt 13 to be fixed to the substrate 2.

The other long edge 692 facing one long edge 691 is also curved in the same direction as the one long edge 691. A portion where one of the long edge portions 691 and the other long edge portion 692 are connected to each other forms arc-shaped short edge portions 7 and 7 that are smoothly continuous.

The one and the other long edges 6
The long hole 6 consisting of 91, 692 and short edges 7, 7 is shown in FIG.
It is formed as shown in FIG. That is, the elongated hole 6 has an arc-shaped inner surface 61 extending from one surface 22a side of the substrate 2 to the elongated hole 6 and a convex projecting from the elongated hole 6 toward the other surface 22b in an arc shape. Article 611. The inner surface 61 and the ridge 611 are formed by press working.

In the belt mounting bracket A1 for a seat belt device configured as described above, one long edge portion 691 is provided.
Of the waist belt 13 is curved so as to protrude in a direction opposite to the tension of the waist belt 13, so that even if one long edge 691 is elastically deformed in the direction of the tension, the one long edge 691
Are not deformed concavely in the direction of tension. Therefore, the belt does not collect on the concave portion, and the width of the waist belt 13 is always maintained at a normal width. As a result, the tension of the waist belt 13 is always evenly distributed on the one long edge portion 691,
In addition, the strength performance of the belt mounting bracket A1 can be improved, and safety can be improved with the improvement in the strength.

Also, the other long edge 692 is curved similarly to the one long edge 691, so that the waist belt 13 is moved along its longitudinal center line to maintain the waist belt 13 in a flat state. When the waist belt 13 is inserted into the long hole 6 while being bent so as to bend along the waist belt 13, the shape of the one and the other long edge portions 691 and 692 substantially matches the curved shape of the waist belt 13, 6 becomes extremely easy to insert.

Moreover, one and the other long edge portions 691, 6
Since the connecting portions of 92, that is, the short edges 7, 7 are formed in a smooth arc shape, even if both ends along the longitudinal direction of the waist belt 13 are in an arc shape, the waist belt 13 is inflated. There is an advantage that the waist belt 13 can be easily inserted into the long hole 6 without the portion hitting the short edge portions 7. In addition, both ends of the waist belt 13 just fit into the short edges 7, 7, and the waist belt 1
When tension is applied to the belt 3, the waist belt 13 can be stably held at a predetermined position of the slot 6.

Further, the elongated hole 6 is formed on one surface 22a of the substrate 2
An arc-shaped inner surface 61 is formed from the side to the inside of the elongated hole 6,
Since the protruding ridge 611 protruding in an arc shape is formed on the other surface 22 b side from the inside of the long hole 6, the waist belt 13 folded back at one long hole edge 691 may hit the corner and be cut off. Can be removed. Moreover, the ridge 6
11, the area of contact with the waist belt 13 is increased, so that the surface pressure acting on the waist belt 13 can be reduced, and the durability and reliability of the waist belt 13 can be improved.

Further, since the ridges 611 are formed over the entire long hole 6, the strength around the long hole 6 is improved, and the strength of the entire belt mounting bracket A1 can be improved. . In particular, since the short edge portion 7 can be strengthened, even if the terminal portions of the waist belt 13 gather at the short edge portion 7 and force concentrates on the short edge portion 7, the short edge 7 The safety of the unit 7 can be improved more than ever.

When tension acts on the waist belt 13,
The waist belt 13 folded back at one long edge 691 comes into close contact with one long edge 691. That is, the folded portion of the waist belt 13 is curved into a shape similar to that of the one long edge portion 691, and the central portion in the width direction has a raised shape. For this reason, the waist belt 13 has one long edge portion 69.
1 is hard to shift in the horizontal direction. Therefore, even if the direction of the tension of the waist belt 13 does not coincide with the direction orthogonal to the one long edge 691, the waist belt 13 is shifted laterally along the one long edge 691, and the end of the long hole 6 It will not be gathered in the club.

Further, since the central portion in the width direction of the waist belt 13 has a raised shape like the one long edge portion 691, the waist belt 13 is in a state of being always widened in the width direction. Therefore, even if the tension is applied to the waist belt 13 so that the waist belt 13 converges to become thin, the width of the waist belt 13 is maintained at the original wide state at the one long edge portion 691. Will be. That is, the waist belt 13 does not gather at a part on one long edge 691. As described above, the width of the belt folded portion is appropriately maintained at one of the long edges, so that the tension of the belt is uniformly transmitted to the one long edge, and the durability and durability of the belt are improved. Safety can be improved with the improvement of the strength performance of the belt mounting bracket A1.

Further, the belt mounting bracket A1 is shown in FIGS.
It is manufactured by the method shown in FIG. However, the belt mounting bracket A1 has an arc-shaped projection 611 protruding only on the other surface 22b side.
In FIG. 14, one ridge 611a protruding from one surface 22a and the other ridge 6 protruding from the other surface 22b.
11b is shown.

6 to 14 show a method of manufacturing the belt mounting bracket A1 formed by the substrate 2, wherein the substrate 2 is formed with an elongated hole 6 into which a belt is inserted. The long hole 6 is formed by folding the belt 13 at one of the long edges 691 of the long edges facing each other,
The long hole 6 is configured to receive the tension of the belt 13, and at least the edge of one long edge 691 of the long hole 6 that receives the tension of the belt 13 is provided with one surface 22 a of the substrate 2.
And one ridge 6 protruding from the other surface 22b, respectively.
11a and the other ridge 611b are formed,
Also, a method of manufacturing the belt mounting bracket A1 having a rounded corner along the direction in which the belt 13 is folded is shown.

Then, in this manufacturing method, as shown in FIG. 6, the belt mounting bracket A1 is sequentially and continuously processed from the strip-shaped steel K having a predetermined thickness continuously fed out by pressing. . First, in the basic cutting step (a), the contour of the winding plate portion 22 is formed with a U-shaped punched hole K1, and the bolt hole 3 is formed by piercing.

Next, a first draw step (b1) in which the portion forming the long hole 6 of the substrate 2 is pressed out to form a first-stage convex portion T1, and a first draw step (b1) A second draw step (b2) in which the protruded first-stage convex part T1 is further pressed to further protrude to form a second-step convex part T2, and a second-step convex part protruded in the second draw step (b2). The third draw step (b) in which the portion T2 is further pressed to further protrude to form the third-stage convex portion T3
3) are sequentially performed.

FIG. 7 shows the cross-sectional shape of the first-stage convex portion T1 whose cross-section protrudes in a U-shape in the first draw step (b1). At the stage where the first-stage convex portion T1 is formed, the corner portion R1 and the corner portion R2 with respect to the strip-shaped steel K have a curved shape with a large radius of curvature. For example, assuming that the thickness of the steel K is 3.2 mm, the radius of the corner R1 and the corner R2 is about 3 mm. In addition, the protrusion amount H of the first-stage convex portion T1 is about 5.2 mm when represented by the height from one surface of the steel K.

FIG. 8 shows the cross-sectional shape of the second-stage convex portion T2 whose cross section is formed to project in a U-shape in the second draw step (b2). By forming the second-stage convex portion T2 from the first-stage convex portion T1, the corner portion R1 and the corner portion R2 are formed.
Of about 2 mm, and the amount of protrusion H is about 6.2
mm.

FIG. 9 shows the cross-sectional shape of the third-stage convex portion T3 whose cross section is formed to project in a U-shape in the third draw step (b3). By forming the third-stage projection T3 from the second-stage projection T2, the corner R1 and the corner R2 are formed.
Of about 1 mm, and the amount of protrusion H is about 7.2
mm.

After the third drawing step (b3), a piercing step (c) is performed as shown in FIG. Piercing process (c)
Then, as shown in FIG. 10, a pilot hole 6a of the long hole 6 is punched in a portion corresponding to the long hole of the third stage convex portion T3 formed in the third draw step (b3). That is, by punching the bottom wall portion T3a of the third-stage protrusion T3, the entire inner surface of the third-stage protrusion T3 becomes the prepared hole 6a of the elongated hole 6. However,
A shear edge portion (burr) T3b is formed at the tip of the inner surface of the third-stage convex portion T3 punched out of the bottom wall portion T3a.

Therefore, as shown in FIG. 6, by performing a face pressing step (d) after the piercing step (c), the shear edge portion T3b generated by the piercing step (c) is removed by face pressing. That is, in the surface pressing step d, FIG.
As shown in FIG. 1, each of the draw steps (b1, b2, b
The peripheral wall portion 23 that has become a semicircular opening edge 23a is formed by pressing a portion of the front end side of the pilot hole 6a formed around the pilot hole 6a by protruding by 3).

Thereafter, as shown in FIG.
Forming step (e) for shaping the third opening edge 23a
And a restriking step (f) of forming the restriking part 24 from the peripheral wall part 23 by restriking the peripheral wall part 23 of the pilot hole 6a shaped in the forming step (e) and forming a round and thick section. And the restric-like portion 24 formed in the restricing step (f).
Step (g) of projecting both sides to form projections 611 a and 611 b on each surface 22 a and 22 b of the substrate 2.
I do.

FIG. 12 shows a sectional shape of the peripheral wall portion 23 after the forming step (e). In the forming step (e), the opening edge 23a of the peripheral wall portion 23 is shaped so as to be bent outward, thereby facilitating an increase in the plate thickness in the subsequent restriking step (f).

FIG. 13 shows the cross-sectional shape of the restrike portion 24 after the restrike step (f). In the restriking step (f), the peripheral wall 23 after shaping is pressed and molded, so that the end face is formed into a semicircular cross-sectional shape in a round shape and the restriking portion 24 formed thicker. ing.

FIG. 14 shows the cross-sectional shape of the ridges 611a and 611b after the double-sided ridge step (g). Each of the ridges 611a and 611b is formed so that its end face is raised in a semicircular shape, and is formed so as to smoothly connect to the long hole 6.

It is to be noted that the ridge is formed on the other surface 2 as shown in FIG.
A ridge 61 protruding on the 2b side (or on one surface 22a side)
When only 1 is formed, a one-sided protruding step (not shown) is performed instead of the double-sided protruding step (g). In this one-sided protruding step, only the details of the restrike portion 24 shown in FIG. 13 are shaped, and almost the entire restrike portion 24 is left. That is, the end surface of the resilience portion 24 is shaped into a semicircle similarly to the end surfaces of the ridges 611a and 611b, and the corner R1 is also formed with the ridges 611.
The convex ridge 611 (see FIGS. 1 and 2) protruding only on one side is formed by shaping into a curved surface curved with a large radius similar to the end surfaces of the a and 611b.

After the step (g) of projecting the double-sided projections or the step of projecting the single-sided projections, the outer peripheral surface of the winding plate 22 and the bolt holes 3 are finely finished by a shaving step (not shown). (Note that this shaving step may be performed at any time after the basic cutting step (a).) Next, as shown in FIG. C beating process (h)
And a venting step (i) for bending the wrapping plate portion 22 by a predetermined amount at the bending portion 2a. Further, it is preferable to form the curved ridge 31 shown in FIG. 1 simultaneously with or before or after the venting step (i).

Thereafter, by cutting the contour of the fixing plate portion 21, the substrate 2 is formed into a belt mounting bracket A1 having a predetermined shape.
And a separating step (j) for separating. By the above series of press working, the belt mounting bracket A1 is automatically and continuously formed from the belt-shaped steel K. As shown in FIG. 6, the steel K may be cut off when the belt mounting bracket A1 is cut off, or may not be cut off. In addition, by dividing, the steel K as waste material becomes finer and less bulky, so that it is easy to store it in a container or the like.

According to the method of manufacturing the belt mounting bracket A1, the first to third draw steps (b1, b2, b
According to 3), the peripheral wall portion 23 can be greatly protruded from the surface of the substrate 2, so that the one and the other convex stripes 611 formed by projecting the peripheral wall portion 23 on both surfaces of the substrate 2 are formed.
a and 611b can also protrude greatly from each surface 22a and 22b of the substrate 2. Therefore, one long edge 6
Since the contact area of the belt 13 that contacts the belt 91 becomes extremely large, the surface pressure of the belt 13 can be reduced to an extremely small value.

Further, the peripheral wall 23 having the sheared edge portion T3b formed into a smooth surface by the surface pushing step (d) is further subjected to the forming step (e) and the restriking step (f), and then to the double-sided projecting step. Since the one and the other ridges 611a and 611b are formed by (g), the surfaces of these ridges 611a and 611b can be finished smoothly. That is, the shear edge portion T3b
Can be prevented from progressing from the minute V-shaped groove in the shearing edge portion T3b in the forming step (e). In addition, by going through the forming step (e), the restriking step (f), and the double-sided protruding step (g), one and the other protruding sections 611a and 611b can be gradually formed. The surfaces of the strips 611a and 611b can be finished smoothly.

Further, since the corners of the ridges 611a and 611b, that is, the cross-sectional shapes of the end faces can be rounded in the above-described series of pressing steps, there is no need to perform finishing or coating in a separate step. Therefore, cost can be reduced.

The same effect as described above can be obtained also when a one-sided protruding step is performed instead of the two-sided protruding step (g). However, since the protrusion 611 only needs to protrude on one side of the substrate 2, the end face and the corner R 1 of the restrike portion 24 are formed into a curved surface with a large radius, so that the restriking process (f) is performed on one side. It is also possible to replace the step of projecting protrusions.

Next, a second embodiment of the present invention will be described with reference to FIG. However, components common to those of the first embodiment shown in FIGS. 1 to 14 are denoted by the same reference numerals, and description thereof will be simplified. The second embodiment differs from the first embodiment in that one long edge 691 and the other long edge 692 of the long hole 6 are formed in a straight line.

That is, as shown in FIG. 15A, the long holes 6 are formed to be long in parallel. In addition, the ridge 611
Are formed only on one long edge portion 691. Then, as shown in FIG. 15B, the protruding ridges 611 are formed so as to protrude only on the other surface 22 b side of the substrate 2. In addition, as shown in FIG. 15C, the protruding strips 611 are formed as one protruding strip 611a and the other protruding strip 611b so as to protrude from one surface 22a and the other surface 22b of the substrate 2, respectively. May be.

The belt mounting bracket A configured as described above
In the configuration 1, the configuration of the ridge 611, the one ridge 611a and the other ridge 611b has the same operation and effect as the first embodiment. Also, the method of manufacturing the belt mounting bracket A1 is the same as that of the first embodiment, and has the same operation and effect as the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIG. However, the components common to the components of the second embodiment shown in FIG. 15 are denoted by the same reference numerals, and description thereof will be simplified. The third embodiment is different from the second embodiment in that the protruding ridge 611 is formed on one long edge 691 and two short edges 7,7.

That is, as shown in FIG. 16 (a), the protruding ridges 611 form one of the long edge portions 691 and 2 in the long hole 6.
It is formed so as to wind the two short edges 7,7. Then, as shown in FIG. 16B, the protruding ridges 611 are formed so as to protrude only on the other surface 22 b side of the substrate 2. In addition, as shown in FIG. 16C, the protruding strips 611 are formed as one protruding strip 611a and the other protruding strip 611b so as to protrude from the one surface 22a and the other surface 22b of the substrate 2, respectively. May be.

Belt mounting bracket A constructed as described above
In 1, the short edges 7, 7 can be reinforced by the ridge 611, one ridge 611 a and the other ridge 611 b. In addition, the same functions and effects as those of the second embodiment are provided.

Next, a fourth embodiment of the present invention will be described with reference to FIG. However, the components common to the components of the second embodiment shown in FIG. 15 are denoted by the same reference numerals, and description thereof will be simplified. The difference between the fourth embodiment and the second embodiment is that the ridge 611 has one long edge 691 and the other long edge 6.
92 and two short edges 7,7.

That is, as shown in FIG. 17A, the protruding ridges 611 are formed over the entire circumference of the long hole 6. The projection 611 is formed so as to protrude only on the other surface 22b side of the substrate 2 as shown in FIG. In addition, this ridge 611 is the same as FIG.
As shown in (c), the one ridge 611a and the other ridge 611b may be formed to protrude from the one surface 22a and the other surface 22b of the substrate 2, respectively.

Belt mounting bracket A constructed as described above
In 1, the entire elongated hole 6 can be reinforced by the ridge 611, one ridge 611 a, and the other ridge 611 b. In addition, the same operation and effect as those of the second and third embodiments are provided.

[0058]

According to the first aspect of the present invention, the plate-like body is formed so as to have one ridge and the other ridge protruding from one surface and the other surface, respectively. The contact area of the belt contacting the long edge increases. Therefore, the surface pressure of the belt can be reduced. Furthermore, since the corner of one long edge is formed round along the direction in which the belt is folded, damage to the belt at this corner can be prevented. Moreover, the corners are rounded, and it is not necessary to coat the corners with PVC or polyethylene.
The cost required for such a coating process can be reduced. That is, cost can be reduced.

Particularly, in the present invention, the peripheral wall can be greatly protruded from the surface of the plate-like body by the first to third drawing steps. The one and the other protruding ridges formed so as to protrude can also largely protrude from each surface of the plate-like body. Accordingly, the contact area of the belt contacting one of the long edges becomes extremely large, so that the surface pressure of the belt can be reduced to an extremely small value.

Further, the peripheral wall portion having the sheared edge portion formed into a smooth surface by the face pressing process is further subjected to a forming process and a restriking process, and then one and the other protruding portions are formed by a double-sided protruding process. Therefore, the surfaces of these ridges can be formed smoothly. That is, by removing the shearing edge portion, it is possible to prevent the crack from advancing from the minute V-shaped groove in the shearing edge portion in the forming step. Moreover, the forming process, the restoring process,
Since the one and the other ridges are gradually formed through the double-sided ridge forming step, the surfaces of these ridges can be finished smoothly.

Furthermore, since the corners of each ridge can be rounded in the above-described series of pressing steps, there is no need to perform finishing or coating in a separate step.
Therefore, cost can be reduced.

[0062] The same effect as described above can be obtained for the second aspect of the invention. However, since the ridges need only be projected on one surface side of the plate-shaped body, the ridges may be configured to play the role of the one-sided ridge-forming step in the restriking step.

[Brief description of the drawings]

FIG. 1 is a front view of a belt mounting bracket shown as a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the belt mounting bracket taken along the line II-II in FIG. 1;

FIG. 3 is a diagram showing the belt mounting bracket, and is an enlarged view of a part III in FIG. 2;

FIG. 4 is a diagram showing the belt mounting bracket, and is a cross-sectional view taken along line IV-IV in FIG. 1;

FIG. 5 is an explanatory view showing a use state of the belt mounting bracket in an automobile.

FIG. 6 is a diagram showing a method of manufacturing the belt mounting bracket, and is a plan view sequentially illustrating steps in forming the belt mounting bracket from a belt-shaped steel.

FIG. 7 is a cross-sectional view showing a method of manufacturing the belt mounting member, showing a first-stage convex portion after a first draw step.

FIG. 8 is a cross-sectional view showing a method of manufacturing the belt mounting member, showing a second-stage convex portion after a second draw step.

FIG. 9 is a cross-sectional view illustrating a method of manufacturing the belt mounting member, showing a third-stage convex portion after a third draw step.

FIG. 10 is a cross-sectional view illustrating a method of manufacturing the belt mounting bracket, showing a third-stage protrusion after a piercing step.

FIG. 11 is a cross-sectional view showing a method of manufacturing the belt mounting bracket, and showing a portion of a prepared hole of a long hole after a surface pushing step.

FIG. 12 is a cross-sectional view illustrating a method of manufacturing the belt mounting member, showing a portion of a long hole prepared after a forming step.

FIG. 13 is a cross-sectional view showing a method of manufacturing the belt mounting bracket, and showing a portion of a pilot hole of a long hole after a restrike step.

FIG. 14 is a cross-sectional view illustrating a method of manufacturing the belt mounting member, showing one and the other convex streaks after a double-sided protruding step.

15 (a) is a front view, FIG. 15 (b) is a cross-sectional view, and FIG. 15 (c) shows another example of FIG. 15 (b). It is sectional drawing.

16 (a) is a front view, FIG. 16 (b) is a sectional view, and FIG. 16 (c) is another example of FIG. 16 (b). It is sectional drawing.

17 (a) is a front view, FIG. 17 (b) is a cross-sectional view, and FIG. 17 (c) shows another example of FIG. 17 (b). It is sectional drawing.

FIG. 18 is a front view of a belt mounting bracket shown as a conventional example.

FIG. 19 is a cross-sectional view of the belt mounting bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Belt (waist belt) 151 Belt (connection belt) 2 Plate-shaped body (substrate) 22a One surface 22b The other surface 23 Peripheral wall portion 23a Opening edge 24 Restlike portion 6 Long hole 6a Lower hole 611 Protrusion 611a One protrusion Strip 611b The other protruding strip 691 One long edge 692 The other long edge b1 First draw step b2 Second draw step b3 Third draw step b3 c Piercing step d Facing step e Forming step f Restriking step g Both sides Projecting step j Separating step A1 Belt mounting bracket A2 Belt mounting bracket T1 First stage projection T2 Second stage projection T3 Third stage projection T3b Shear edge (burr)

Claims (2)

[Claims] 1. A method for manufacturing a belt mounting bracket for a seat belt device formed by a plate-like body (2), wherein the plate-like body (2) has a slot (6) into which a belt (13) is inserted. The long hole (6) is formed by folding the belt (13) at one long edge (691) of the long edges facing each other to reduce the tension of the belt (13). And one long edge portion (69) of at least one belt (13) which receives the tension of the belt (13).
The edge of (1) has one surface (22) of the plate-like body (2).
a) and the other surface (22b) are formed so as to have one ridge (611a) and the other ridge (611b) protruding from the other surface (22b), respectively, and have round corners along the direction in which the belt (13) is folded back. In the manufacturing method of the formed belt mounting bracket for a seat belt device, a portion of the plate-like body (2) where the long hole (6) is formed is pressed and protruded to form a first-stage convex portion (T1). The first draw step (b1) to be formed, and the first step protrusion (T1) protruded in the first draw step (b1) is further pressed to further protrude to form the second step protrusion (T2). Second draw step (b2)
And a third draw step (b3) of further pressing the second step protrusion (T2) protruded in the second draw step (b2) to further protrude to form a third step protrusion (T3).
A piercing step (c) of punching a prepared hole (6a) of the elongated hole (6) at a portion corresponding to the elongated hole of the third step projection (T3) formed in the third drawing step (b3); The shear edge (T) generated by the step (c)
A surface pressing step (d) for removing 3b) by surface pressing; and a peripheral wall portion (23) formed around the prepared hole (6a) by being surface pressed in the surface pressing step (d) and protruding in each of the drawing steps. A) a forming step (e) for shaping the opening edge (23a); and a restriking step (r) for restoring the peripheral wall portion (23) of the pilot hole (6a) shaped by the forming step (e) to round the cross section. f), and both-sided projections (611a) and (611b) are formed on both sides of the plate-like body (2) by projecting both sides of the restriking portion (24) restriated in the restriking step (f). A projection step (g); and a separating step (j) for separating the plate-like body (2) obtained by the double-sided projection step (g) as a belt mounting bracket having a predetermined shape. Characteristic Of manufacturing a belt mounting bracket for a seat belt device. 2. A method of manufacturing a belt mounting bracket for a seat belt device formed by a plate-like body (2), wherein the plate-like body (2) has a slot (6) into which a belt (13) is inserted. The long hole (6) is formed by folding the belt (13) at one long edge (691) of the long edges facing each other to reduce the tension of the belt (13). And one long edge portion (69) of at least one belt (13) which receives the tension of the belt (13).
The edge of 1) is formed to have a ridge (611) protruding from one surface of the plate-like body (2), and has a rounded corner along the direction in which the belt (13) is folded back. In the method for manufacturing a belt mounting bracket for a seat belt device, a portion of the plate-like body (2) where the long hole (6) is formed is pressed and protruded to form a first-stage convex portion (T1). A first draw step (b1), and a second step in which the first-step protrusion (T1) protruded in the first draw step (b1) is further pressed to further protrude to form a second-step protrusion (T2). Draw process (b2)
A third draw step of further pressing the second-stage convex portion (T2) protruded by the second draw step (b2) to further protrude to form a third-stage convex portion (T3); A piercing step (c) for punching a pilot hole (6a) in the slot (6) at a portion corresponding to the slot in the third step projection (T3) formed in the third drawing step (b3); ) Caused by the shear edge (T
A surface pressing step (d) for removing 3b) by surface pressing; and a peripheral wall portion (23) formed around the prepared hole (6a) by being surface pressed in the surface pressing step (d) and protruding in each of the drawing steps. A) a forming step (e) for shaping the opening edge (23a); and a restriking step (r) for restoring the peripheral wall portion (23) of the pilot hole (6a) shaped by the forming step (e) to round the cross section. f), and a single-sided projection that forms a convex strip (611a) on one surface of the plate-like body (2) by projecting a single-sided protruding portion of the restrike portion (24) resurrected in the restriking step (f). A seat belt device comprising: a step of setting up; and a separating step (j) of separating the plate-like body (2) obtained by the one-sided protruding step as a belt mounting bracket having a predetermined shape. Manufacturing method of mounting belt mounting bracket.