JPH06278566A - Slip anchor for seat belt device - Google Patents

Abstract

PURPOSE:To provide a slip anchor having a large deformation resistance against the working force at a low cost. CONSTITUTION:Cross section of a part of a guide ring 3, to which a webbing W slides for contact, is pressure-deformed by casting so as to have a flat cross section along the direction of the working force of the webbing W. This pressure-deformed part is coated with resin to form a resin slip guide part 5 as a webbing guide surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slip anchor for a seat belt device, in particular, a webbing fixed to an upper portion of a pillar of a vehicle body and slidably attached to a webbing pulled out from a winding device of the seat belt device. The present invention relates to a slip anchor for a seat belt device that guides in an easy direction.

[0002]

2. Description of the Related Art Currently, a seat belt device is an indispensable device for automobiles and the like as a device for restraining an occupant's abrupt movement caused by an acceleration or an impact force generated in a collision to ensure the occupant's physical safety. This type of seat belt device is usually a webbing (hereinafter, a woven belt made of a normal fiber material having a width of about 50 mm as defined in Japanese Industrial Standards is referred to as a webbing in the present specification) and this webbing. A retractor that locks the drawer of the webbing and restrains the occupant only when it is wound by a spring force and pulled inward and the impact is applied by a collision (hereinafter, referred to as ELR: Emergency Locking Retractor).
And a buckle device, a tongue, an anchor, etc., which are installed at appropriate positions for mounting the webbing so as to fit the body of the occupant. Of these, the anchor is attached with a fixing anchor for fixing the end portion of the webbing of the lap belt (waist belt) to the vicinity of the floor of the vehicle body, and a mounting bolt or the like at a position above the pillar of the vehicle body,
There is a slip anchor installed so as to be rotatable in a predetermined direction with respect to the mounting bolt. This slip anchor changes the direction of the webbing pulled out upward along the pillar from the ELR installed in the pillar at the side position of the occupant, etc., and uses the webbing as a shoulder belt at the front position of the occupant's chest. It plays the role of guiding them to be passed over.

Further, the slip anchor normally guides the webbing pulled out from the ELR to the shoulder belt position when the seat belt device is worn, and the webbing that is wound by the winding operation of the spring in the ELR when the seat belt device is not worn. It functions as a guide, but in the event of a collision, it bears a force of about 1 ton acting through the webbing that restrains and receives the occupant moving forward due to the acting inertial force. Therefore, the slip anchor has a guide part that can smoothly guide the webbing forward and backward, and
It is necessary to have a structural shape that is firmly attached to a fixed portion such as a vehicle body frame so as to withstand the acting force at the time of collision, and that the member itself does not deform.

FIG. 6 shows an example of a conventional slip anchor. A slip anchor 50 is a plate 51 formed by punching out a steel plate having a predetermined thickness, and this plate 5
1 and a resin guide portion 53 formed by resin molding with a part of the core 1 as a core. Plate 5
1 is a mounting portion having a mounting hole 51a and a guide hole 52
It is configured integrally with the formed guide part,
The resin guide portion 53 is formed so that the resin cross section has a substantially circular shape so that the webbing W inserted in the elongated guide hole 52 can be smoothly guided (see FIG. 6B). In addition, escape portions 52a are formed at both ends of the guide hole 52, so that when the webbing W is guided along the slip anchor, the webbing W is prevented from being twisted or the end portion being warped.

[0005] This type of slip anchor has a guide portion and the like that are exposed to the occupant's eyes and is molded with a resin in a predetermined design so that a high-grade feeling can be obtained and the core plate 51 is set to a predetermined plate thickness. Therefore, the longitudinal steel section has a section modulus that can withstand a collision.

7 (a) and 7 (b) show another conventional example of a slip anchor, which is prepared by bending a round steel bar as shown in FIG. 7 (c) into an elliptical shape in advance. The lower end portion 61a of the mounting plate 61, which fixes and holds the guide ring, is rolled and rolled into the guide ring 62, and the predetermined position 61b is caulked and fixed. As is clear from each figure, in this slip anchor 60, a guide hole 62 is formed by a guide ring 62 to guide the webbing W therethrough. Since this type of slip anchor can be manufactured only by metal working, it can be manufactured at a lower cost than the type of slip anchor shown in FIG. 7, and is widely used in commercial vehicles and the like. The mounting portion of any type of slip anchor is covered with a resin cover C.

[0007]

However, in the slip anchor of the type shown in FIG. 6, the plate 51, which is the core mold, is embedded in advance at a predetermined position in the mold during resin molding, and insert molding for resin molding is performed. Need to be manufactured by Further, in order to obtain a predetermined strength, the plate 51 is generally punched out of the base material in consideration of the direction of the material flow line of the portion 51b where the tensile force acts. Therefore, there is a problem that the product yield in each process is low and the manufacturing cost is high. In addition, the slip anchor of the type shown in FIG. 7, which emphasizes cost, is unattractive because the metal ring with a rust-proof coating is exposed as it is, and the guide portion with which the webbing abuts has a round shape. Since it is a processed steel bar, it cannot have a large section modulus. Therefore, it is necessary to use a material having a relatively large diameter so that the guide portion is not deformed by the acting force at the time of collision, and there is a problem that cost reduction in manufacturing the parts cannot be expected so much.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, maintain a beautiful appearance when mounted in a vehicle, and have a large deformation resistance against an acting force at the time of a collision, thereby reducing the manufacturing cost. An object of the present invention is to provide a slip anchor for a seat belt device.

[0009]

In order to achieve the above-mentioned object, the present invention provides a guide member having a webbing insertion hole formed by bending a steel material and fixedly holding the guide member by a guide member holding means to form a part of a vehicle body. In a slip anchor for a seat belt device, which is swingably attached and is configured to guide insertion of the webbing, in the guide member, at least a part cross section of a side on which the webbing slides is in contact with a direction of acting force of the webbing. And is deformed by forging so as to have a flat cross-sectional shape, and the webbing guide surface is formed by a resin coating portion having the pressed and deformed portion as a core.

In this case, it is preferable that the guide member is formed by bending a round steel bar so that the insertion hole of the webbing is formed into an oval shape. Further, it is preferable that the guide member is fixed to the guide member holding means by caulking.

[0011]

According to the present invention, at least the section cross section of the guide member at least on the sliding contact side of the webbing is press-deformed by forging so as to have a flat cross-sectional shape along the acting force direction of the webbing, and the press-deformation is performed. Since the webbing guide surface is formed by the resin coating portion having the portion as the core portion, the cross-section coefficient is increased by increasing the member height with respect to the acting direction of the acting force by the webbing of the guide member,
The bending resistance force against the bending action force from the webbing increases, and the strength of the guide member can be increased.

In this case, a round bar steel is used as a material, and the insertion hole of the webbing is formed into an elliptical shape by bending, or the guide member is fixed to the guide member holding means by caulking, thereby reducing the manufacturing cost. Can be further lowered.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a slip anchor for a seat belt device according to the present invention will be described below with reference to FIGS. FIG. 1 shows the entire slip anchor 1 with the resin cover C removed, and is fixed to a pedestal portion which is a part of a frame of a vehicle body (not shown) through a mounting plate 2 which is a guide member holding means. It is like this.
The mounting plate 2 is formed by punching out a flat steel plate, and a mounting hole 2a for rotatably mounting to a pillar (not shown) of a vehicle body or the like via a mounting bolt is formed at a central position of an upper portion. On the other hand, a ring holding portion 2b which is roll-processed with a predetermined width is formed at a lower end portion so as to surround the guide ring 3 which is a guide member. The ring holding portion 2b prevents the guide ring 3 from being firmly fixed. It is caulked at two locations (2c).

In this embodiment, the guide ring 3 has a substantially square shape whose corners are bent at a predetermined radius, and its material cross section is a flat oval as shown in FIGS. There is. Further, a resin slip guide portion 5 forming a webbing guide surface is formed at a portion where the webbing W inserted through the guide hole 4 is in sliding contact. The resin slip guide portion 5 is formed in a substantially circular cross-sectional shape with the flat oval portion of the guide ring 3 as a core portion, has a large radius of curvature, and the webbing W is smoothly guided while slidingly contacting this surface. It is like this. In addition, in this embodiment, FIG.
As shown in FIG.
Although it is formed only on the sliding contact portion of the guide ring, the side portion 3a of the guide ring 3 may be covered in order to enhance the aesthetic appearance. It is also preferable to form a relief as shown in the example. Further, it is natural that the bending shape of the guide ring 3 may be the elliptical shape shown in the conventional example.

FIG. 2B shows a modification in which a predetermined offset is provided between the mounting surface of the resin cover C and the webbing W. As shown in the figure, a part 2d of the mounting plate 2 is bent at a predetermined angle, so that a predetermined amount d is provided between the mounting surface of the resin cover C and the webbing W extending from the ELR (not shown). Can be offset. FIG. 2C shows another modified example in which the cross section of the guide ring 3 at the core position of the resin slip guide part 5 is pressed and deformed so as to be flat. According to this modification, the strength of the guide member is increased by increasing the section modulus of the guide ring at the core position of the resin slip guide portion 5, and the caulking process to the mounting plate that is the guide member holding means is easy. And it can be done reliably.

Here, the processing of the guide ring 3 will be described with reference to FIG. FIG. 3A shows a state in which a guide ring material obtained by bending a round steel bar into an elliptic shape as shown in FIG. 7C as described in the conventional example is placed on the anvil 6 of the press machine. It is a thing. This anvil 6
The upper guide ring material 3 is pressed by a flat die 7 in a direction indicated by an arrow in the drawing with a predetermined pressure, and is forged into a guide ring 3 having a flat oval cross section as shown in FIG. As described above, the cross-sectional shape of the guide ring material 3 is processed into a flat oval shape along the acting direction of the acting force of the webbing, so that the section modulus for bending is increased and the bending resistance is increased for the circular section. To increase. At the same time, it can be expected that the material quality will be improved by forging.

4 and 5 show modified examples of the above-described embodiment, which will be described with reference to the drawings. The slip anchor 1 shown in FIG. 4 is used when cold forging the guide ring 10 as shown in FIG.
The core portion of the resin guide portion is formed by performing upset molding with a predetermined die without performing free forging with the flat dies 6 and 7 as shown in FIG. That is, in the illustrated guide ring 10, the mounting plate portion has a circular cross section, but the portion forming the core has a sectional shape shown in FIG.
As shown in (a), the upper end has a substantially circular shape with a predetermined curvature, and the lower end is pressed and deformed by swaging to have a substantially convex shape. Further, the resin guide portion 11 is formed by resin coating with this as a core portion, and a predetermined radius of curvature is secured at the position of the outer peripheral surface where the webbing slidably contacts, thereby facilitating the guidance of the webbing W. According to this modification, an aesthetically pleasing component can be made only by forming a thin coating film by resin coating. However, even when the resin guide portion 11 is formed by resin molding, the amount of resin used can be reduced and the manufacturing cost can be reduced. Can be lowered.

FIGS. 5 (b) and 5 (c) show a modification in which the cross-sectional shape of the resin guide portion 11 is made to be a preferable shape when the offset d is provided. As shown in (b) and (c) of the figure, in order to provide the offset d, it is necessary to bend the mounting plate 2 or forge the guide ring 10 itself so that it bends at a predetermined angle. However, at that time, the material cross-sectional shape of the core portion of the resin guide portion 11 should be such that the ellipse is convex toward the sliding surface side so that the radius of curvature of the surface on which the webbing W slides becomes large. It is cold-formed into a curved shape. In this modification, the contact surface on which the webbing W slides is asymmetric with respect to the sectional axis of the guide ring 10, and the guide ring 1
A torsional shear flow occurs in the 0 cross section, but the webbing W
The guidance can be made smoother.

In the above description of the embodiments, an example in which the slip anchor for a seat belt device is applied to a so-called shoulder anchor that is fixed to a pillar position of a vehicle body has been described. However, the present invention connects and fixes the webbing to the buckle device. It is naturally possible to improve the mechanical properties of the tongue and reduce the manufacturing cost by applying it to the tongue.

As is apparent from the above description, according to the present invention, the slip anchor is constructed by using the guide member forged into the predetermined flat shape, and the guide member is resin-molded. Therefore, it is possible to mold parts into a predetermined shape with a small amount of resin used, increase the section modulus of the member, and increase the deformation resistance under load by increasing the material strength, thus suppressing the size of the material used. As a result, it is possible to improve the aesthetic appearance and reduce the manufacturing cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a slip anchor for a seat belt device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line IIa-IIa of the slip anchor shown in FIG. 1 and a cross-sectional view showing a modified example of the same.

FIG. 3 is a partial cross-sectional view schematically showing a processed state of the guide ring shown in FIG.

FIG. 4 is a perspective view showing a modified example of the slip anchor shown in FIG.

5 is a cross-sectional view taken along the line VIa-VIa of the slip anchor shown in FIG. 4 and a cross-sectional view showing a modified example of the same.

FIG. 6 is an explanatory view showing an example of a conventional slip anchor for a seat belt device.

FIG. 7 is an explanatory view showing an example of a conventional slip anchor for a seat belt device.

[Explanation of symbols]

 1 Slip anchor for seat belt device 2 Mounting plate 3, 10 Guide ring 4 Guide hole 5, 11 Resin slip guide C Resin cover W Webbing

[Procedure amendment]

[Submission date] June 10, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

7 (a) and 7 (b) show another conventional example of a slip anchor, which is prepared by bending a round steel bar as shown in FIG. 7 (c) into an elliptical shape in advance. The lower end portion 61a of the mounting plate 61, which fixes and holds the guide ring, is rolled and rolled into the guide ring 62, and the predetermined position 61b is caulked and fixed. As is clear from each figure, in this slip anchor 60, a guide hole 63 is formed by a guide ring 62 for inserting and guiding the webbing W. Since this type of slip anchor can be manufactured only by metal working, it can be manufactured at a lower cost than the type of slip anchor shown in FIG. 6 (a) , and is widely used in commercial vehicles and the like. The mounting portion of any type of slip anchor is covered with a resin cover C.

Claims (3)

[Claims] 1. A guide member having a webbing insertion hole formed by bending a steel material is fixedly held by a guide member holding means and swingably attached to a part of a vehicle body to guide the insertion of the webbing. In the slip anchor for a seat belt device as described above, the guide member is pressed and deformed by forging so that at least a part cross-section of the sliding contact side of the webbing has a flat cross-sectional shape along the acting force direction of the webbing,
A slip anchor for a seat belt device, wherein a webbing guide surface is formed by a resin coating portion having the pressed and deformed portion as a core portion. 2. The slip anchor for a seat belt device according to claim 1, wherein the guide member has an insertion hole for the webbing formed into an elliptical shape by bending a round steel bar. 3. The slip anchor for a seat belt device according to claim 1, wherein the guide member is fixed to the guide member holding means by caulking.