JP2002114129A - Seat belt device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device that has a webbing guide having a small frictional resistance of a surface for sliding contact with webbing and free of deviation of the webbing in a belt slot. SOLUTION: The seat belt device has a webbing guide W having an insert metal fitting 11, a coating resin 12 molded on the insert metal fitting 11, and a dull-finished metal member 13 mounted over the coating resin 12 to provide a surface for sliding contact with webbing W. The surface of the metal member 13 for sliding contact with the webbing W has grooves 13a along the sliding directions of the webbing W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device for a vehicle such as an automobile, and more particularly to a seat belt provided with a webbing guide for slidingly contacting a webbing sent from a retractor and guiding the webbing in a predetermined direction. Related to the device.

[0002]

2. Description of the Related Art Conventionally, as a seat belt device for restraining an occupant or the like to a seat, there is a three-point seat belt device using continuous webbing. FIG. 4 shows a three-point seat belt device 110 mounted on a conventional automobile. In the seat belt device 110, the webbing W has one end wound around a retractor 112 attached to a center pillar 113 of the vehicle body so as to be able to be pulled out, and the other end fixed to a lower portion of the center pillar 113.
14. The webbing W engages with a buckle 118 erected near the seat 117 in the vehicle body with a sluting 116 disposed between the anchor plate 114 and the through anchor 115.

[0003] The webbing W is a seat belt device 110.
During use, the vehicle traverses obliquely downward in front of the fuselage from the outside shoulder of the occupant 119 to the inside waist of the occupant 119, is folded back by the sluting 116, and traverses substantially horizontally along the waist of the occupant 119, as shown in the figure. Then, the occupant 119 sitting on the seat 55 is restrained by the seat 55.

[0004] In the above-described seat bell device 110, such a webbing guide is provided by the retractor 11.
2 is also located near the exit. Each of the webbing guides is provided with an elongated belt slot. The webbing W inserted into the belt slot slides on the webbing guide and is guided in a predetermined direction.

In the above-described webbing guide, in order to secure a good winding property of the webbing W and a good operational feeling when the webbing W is pulled out, a sliding contact surface between the webbing W and the webbing guide (hereinafter referred to as a webbing sliding surface). It is necessary to keep the frictional resistance in ()) as low as possible. Therefore, a surface treatment such as forming a coating resin to smooth the surface shape or applying a fluorine-based paint having low frictional resistance is applied to the webbing sliding contact surface.

As shown in the figure, the webbing W pulled out from the retractor 112 is folded back through the through anchor 115, and its direction is changed so as to form an angle of approximately 45 degrees in plan view. . That is, the through anchor 115 is used as a webbing guide for changing the direction of the webbing W. In the webbing guide used in this way, if the frictional resistance on the webbing sliding surface is low, the webbing W is biased in the belt slot, the webbing W is twisted, and the occupant is restrained to the seat by an appropriate force. It may not be possible.

Japanese Utility Model Publication No. Sho 53-20087 proposes a through anchor for solving such a problem. This through anchor is provided with a support fitting that is rotatable and attachable to a vehicle body, in an oval ring formed of a round bar, and covers the round bar with a coil having an inner diameter slightly larger than its outer diameter. Both ends of the coil are fixed to a collar provided near the support fitting. In such a through anchor, when the webbing is inserted into the oval ring, the coil is arranged at the sliding contact portion between the webbing and the through anchor, thereby preventing the webbing from being biased, The frictional resistance with the webbing can also be reduced.

[0008] Japanese Utility Model Publication No. 63-35013 also proposes a through anchor for solving the above-mentioned problem. In this through anchor, a resin bulging portion for guiding the webbing in a predetermined direction is provided in a sliding contact portion with the webbing. This bulge is
In a state where the through anchor is attached to the center pillar of the vehicle body, the bulge is configured to increase toward the rear of the vehicle body inside the vehicle through the through anchor. By doing so, the webbing that has slidably contacted the bulging portion is led out to the front of the vehicle body. Furthermore, since the surface of the resin swelling portion that is in sliding contact with the webbing is provided with irregularities, the webbing can be guided in a predetermined direction and the belt can be prevented from being biased.

[0009]

However, in the through anchor described in Japanese Utility Model Publication No. 53-20087 described above, the coil is coated on the ring of the round bar, which complicates the manufacturing process, and is accompanied by this. There is concern that production costs will increase. Further, the through anchor described in Japanese Utility Model Publication No. 63-35013 mentioned above has a drawback that the frictional resistance is high because the sliding contact surface with the webbing is made of resin.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a sheet having a webbing guide in which the frictional resistance of a sliding surface with a webbing is low and the webbing is not biased in a belt slot. A belt device is provided.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a webbing for restraining an occupant's body on a seat, and a webbing for slidingly contacting the webbing when restraining the occupant's body on the seat. The webbing guide is provided with a webbing guide leading out in the direction of, the webbing guide is mounted on the insert fitting, the coating resin molded on the insert fitting, and the coating resin, and comes into sliding contact with the webbing. A metal member that provides a surface, and the surface of the metal member that is in sliding contact with the webbing can be achieved by a seat belt device provided with a groove along the sliding direction of the webbing.

The surface of the metal member is preferably dulled. Here, "dull finish" refers to the surface state of the cold-rolled steel sheet and the steel strip, the outer peripheral surface of the cold-rolled roll was uniformly roughened, and the surface of the steel sheet was finished in a matte-like matte state. A thing. According to the seat belt device having the above-described configuration, the surface of the metal member that is in sliding contact with the webbing is dull-finished so as to have a satin finish, so that it is not necessary to perform shot blasting, and a complicated winding operation is required. The frictional resistance of the webbing sliding contact surface can be reduced without using a coil having the following characteristics. By doing so, the webbing can smoothly slide on the surface of the metal member, so that the operability when the webbing is pulled out from the retractor and the winding property of the webbing are good. Further, since a groove is provided on the surface of the metal member along the sliding direction of the webbing, when tension is generated in the sliding direction of the webbing, a part of the webbing is stored in the groove.
At this time, even if a force is applied in the width direction of the webbing, the force applied in the width direction of the webbing is canceled out by the resistance of the groove to the force of a part of the webbing stored in the groove to cross the groove. Thus, the webbing is not biased in the belt slot, and the webbing is not twisted during the webbing withdrawing / winding operation.

The "metal member" may be formed from a metal plate. At this time, the thickness of the metal plate is preferably 0.2 mm or more and 0.8 mm or less. 0.2m thick metal plate
If it is smaller than m, a predetermined strength cannot be secured when the metal member is mounted on the webbing guide. If the thickness of the metal plate is larger than 0.8 mm, it is difficult to form a groove in an arbitrary shape on the surface of the metal plate, and the mounting process for mounting the metal member on the resin portion of the webbing guide becomes complicated. The groove provided on the surface of the metal member is
What is necessary is just to be comprised so that a step may be provided on the plane of a metal member. For example, a concave portion formed by a gentle curved surface or a concave portion formed by a bent surface formed by pressing a metal plate or the like may be used. A plurality of these grooves may be provided on the surface of the metal member, and the number of the grooves may be increased or decreased in the width direction of the webbing, or the width or the depth of the groove may be increased or decreased. Further, a groove corresponding to the groove provided on the surface of the metal plate described above may be provided on the outer surface of the resin portion to which the metal member is attached. By doing so, the metal member is attached without causing a positional shift with respect to the resin portion.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the embodiments described below, the members and the like having the same configurations and operations as the members and the like already described are denoted by the same reference numerals or corresponding reference numerals in the drawings, and the description thereof will be simplified or omitted.

FIG. 1 shows a through anchor 1 which is a webbing guide of a seat belt device according to an embodiment of the present invention.
Indicates 0.

The through anchor 10 is formed by integrally molding a coating resin 12 by molding with an insert fitting 11 formed by processing a single plate-like metal into a required shape. The member 13 is wound. The insert fitting 11 is formed in a required shape by punching a metal plate such as a steel plate, for example.
A bolt insertion hole 14 for inserting a bolt or the like for rotatably supporting the shaft 0 on a center pillar of the vehicle body is formed. A belt slot 15 for inserting the webbing W is provided in a lower portion (a lower portion in the figure). Is provided. Through anchor 1
Insert metal fittings 11
Examples of the material include a carbon steel material (JIS SC material) having a predetermined plate thickness. The insert fitting 11 may be subjected to a heat treatment so as to withstand a predetermined load.

The coating resin 12 is molded into the insert fitting 11 near the belt slot 15 so as to have a required shape, and forms a lower portion of the through anchor 10. In the vicinity of the belt slot 15 of the coating resin 12, a curved surface 12a that is convex on the inner peripheral side of the belt slot 15 is formed. A groove (not shown) for locking a metal member 13, which will be described later, is provided below the coating resin 12. The coating resin 12 is made of a resin having high mechanical strength. Specific examples of the coating resin 12 include a polyamide resin such as polyamide 6, a resin obtained by adding a reinforcing agent to polyacetal and polypropylene, and a polycarbonate.

The metal member 13 is wound around the outer surface of the coating resin 12 constituting the lower edge portion of the belt slot 15, and forms a webbing sliding contact surface that is a sliding contact surface with the webbing W.
The state in which the webbing W slides on the webbing sliding contact surface is indicated by a two-dot chain line in the figure. In the drawing, a plurality of recesses 13 a forming grooves are provided on the webbing sliding surface of the metal member 13. The concave portions 13a are aligned in the width direction (left-right direction in the drawing) of the webbing W of the metal member 13. Further, the webbing width direction end 13b of the metal member 13 is retracted in the anti-webbing direction from the webbing sliding contact surface. The metal member 13 is made of, for example, a thin metal plate made of stainless steel, an iron-based material aluminum alloy, a titanium alloy, or the like that can withstand a predetermined load.

FIG. 2 shows the metal member 13 before being attached to the through anchor 10. FIG. 2A is a plan view of the metal member 13, and FIG. 2B is a side view of the metal member 13. As shown in FIG. 2 (B), the metal member 13 is formed by bending a metal plate having a thickness of 0.3 mm whose surface is processed into a matte shape by dull finish so as to have an inverted U shape in cross section. Is applied. At this time, as shown in FIG.
The four recesses 13a near the top (upper side in the figure) of the metal member 13 are aligned in the webbing width direction (horizontal direction in the figure) of the metal member 13, and the sliding direction of the webbing of the metal member 13 (vertical direction in the figure). It is arranged to extend. Recess 13a
Is gradually reduced from the top of the metal member 13 toward the webbing sliding direction of the metal member 13.
A claw 13d is provided at the end 13c in the webbing sliding direction.
Are formed.

Next, FIG. 3A is a sectional view taken along the line AA in FIG. FIG. 3A shows a state in which the metal member 13 is wound around the coating resin 12 on the lower edge of the belt slot 15 to form a webbing sliding contact surface. The metal member 13 is attached to the curved surface 12 a of the coating resin 12 that forms the lower edge of the belt slot 15. At this time,
The top of the metal member 13 is a curved surface 12a of the coating resin 12.
Placed on top of The end 13 c of the metal member 13 in the webbing sliding direction is symmetrically placed with respect to the insert fitting 11, and is housed in a groove 16 provided below the coating resin 12. Thereafter, the fixing rod 17 is moved to the through anchor 10.
Is inserted into the groove 16 from below (downward in the figure) and fixed. At this time, the end 13c of the metal member 13 in the webbing sliding direction is wound around the fixing rod 17, and the claw 13d is further folded back to form the end 13c in the webbing sliding direction.
The metal member 13 is fixed to the fixing rod 17 by pressing with c. Thus, the metal member 13 is fixed to the outer surface of the coating resin 12.

FIG. 3 (B) shows a view taken along line BB in FIG. 3 (A).
FIG. As described above, the recess 13a is formed on the surface of the metal member 13 that is in sliding contact with the webbing. Metal member 1
On the outer surface of the coating resin 12 which is in contact with the third concave portion 13a, a storage concave portion 12d engaging with the concave portion 13a is formed.
By doing so, the metal member 13 is fixed without causing a positional shift with respect to the curved surface 12 a of the coating resin 12. When tension is generated in the webbing W in the sliding direction, a part of the webbing W is accommodated in the recess 13a.

According to the seat belt device having the above-described configuration, the webbing sliding contact surface of the metal member 13 that is in sliding contact with the webbing W is processed to have a matte finish by dull finish, eliminating the need for shot blasting. Also, there is no need to use a coil requiring a complicated winding operation, and the frictional resistance between the webbing W and the webbing sliding contact surface can be reduced. By doing so, the webbing W can smoothly slide on the webbing sliding contact surface, so that the operability when the webbing W is pulled out from the retractor and the webbing W
Has good winding property. Further, since the concave portion 13a is provided on the surface of the metal member along the sliding direction of the webbing, when tension is generated in the sliding direction of the webbing W, a part of the webbing W is stored in the concave portion 13a. Is done. At this time, even if a force is applied in the width direction of the webbing W, a part of the webbing W stored in the recess
, The force applied in the width direction of the webbing W is cancelled. Thus, the webbing W is not biased in the belt slot 15, and the webbing W is not twisted during the operation of pulling out and winding the webbing W.

It should be noted that the present invention is not limited to the above-described embodiment, and appropriate modifications and improvements can be made.
In the present embodiment, the concave portion 13a on the webbing sliding contact surface
Is provided in the webbing sliding direction of the metal member 13. However, when the webbing W slides so as to form a predetermined angle with the webbing sliding direction of the metal member 13, The recess may also be arranged to form a predetermined angle with the webbing sliding direction of the metal member 13.

[0024]

As described above, according to the seat belt device of the present invention, the frictional resistance between the webbing and the webbing guide can be reduced, and the webbing is not biased on the sliding surface of the webbing guide. . Furthermore, by forming the sliding contact surface of the webbing with a metal member made of a thin metal plate having a dull finish, a webbing guide that is inexpensive and does not significantly increase in weight can be manufactured.

[Brief description of the drawings]

FIG. 1 is a plan view showing a through anchor 10 of a seat belt device according to an embodiment of the present invention.

FIGS. 2A and 2B are a plan view and a side view showing the metal member 13 before being attached to the through anchor 10. FIGS.

3 is a cross-sectional view taken along the line AA in FIG. 1 and a cross-sectional view taken along the line BB in FIG. 3 (A).

FIG. 4 shows an occupant 1 when the three-point seat belt device is mounted on a vehicle.
It is a schematic perspective view which shows a 19 constrained state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Through anchor (webbing guide) 11 Insert fitting 12 Coating resin 12a Curved surface 13 Metal member 13a Concave part (groove) 13b, 13c End part 13d Claw 14 Bolt insertion hole 15 Belt slot 16 Groove 17 Fixing rod W Webbing

Claims (1)

[Claims] 1. A webbing for restraining an occupant's body on a seat, and a webbing guide for slidingly contacting the webbing when the occupant's body is restrained on the seat and leading the webbing in a predetermined direction. In the seat belt device, the webbing guide has an insert fitting, a coating resin molded into the insert fitting, and a metal member mounted on the coating resin and providing a surface that comes into sliding contact with the webbing, A seat belt device, characterized in that a surface of the metal member that is in sliding contact with the webbing is provided with a groove along a sliding direction of the webbing.