JP3689631B2 - Seat belt device - Google Patents

Description

[0001]
BACKGROUND 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 device provided with a webbing guide that slides on a webbing sent from a retractor and guides the webbing in a predetermined direction.
[0002]
[Prior art]
Conventionally, there is a three-point seat belt device using continuous webbing as a seat belt device for restraining an occupant or the like to a seat.
FIG. 4 shows a three-point seat belt device 110 that is mounted on a conventional automobile. In the seat belt device 110, the webbing W is wound around a retractor 112 attached to the center pillar 113 of the vehicle body so that the webbing W can be pulled out, and the other end is engaged with an anchor plate 114 fixed to the lower portion of the center pillar 113. Stopped. The webbing W is engaged with a buckle 118 erected in the vicinity of the seat 117 in the vehicle body with a sluting 116 disposed between the anchor plate 114 and the through anchor 115.
[0003]
When the seat belt device 110 is used, the webbing W traverses the front of the trunk diagonally downward from the outer shoulder portion of the occupant 119 to the inner waist portion of the occupant 119 and is folded back by the sluting 116 so as to be substantially horizontal along the lumbar portion of the occupant 119 The occupant 119 seated on the seat 55 is restrained to the seat 55 as shown in the figure.
[0004]
In the seat bell device 110 described above, such a webbing guide is also disposed near the outlet of the retractor 112. Each of the webbing guides is provided with an elongated belt slot. The webbing W inserted into the belt slot is in sliding contact with the webbing guide and is guided in a predetermined direction.
[0005]
In the above-described webbing guide, in order to ensure a good winding property of the webbing W and a good operational feeling when the webbing W is pulled out, friction on the sliding contact surface (hereinafter referred to as webbing sliding contact surface) between the webbing W and the webbing guide. It is necessary to keep the resistance as low as possible. Therefore, a surface treatment such as forming a coating resin on the webbing sliding contact surface to smooth the surface shape or applying a fluorine-based paint having low frictional resistance is performed.
[0006]
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 about 45 degrees in a 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 contact surface is low, the webbing W is displaced in the belt slot, the webbing W is kinked, and the occupant is restrained to the seat with an appropriate force. There are cases where it is not possible.
[0007]
A through anchor for solving such a problem is proposed in Japanese Utility Model Publication No. 53-20087. This through-anchor is provided with a support bracket that can be rotated and attached to a vehicle body on an oval ring formed of a round bar, and the round bar is covered with a coil having an inner diameter slightly larger than its outer diameter. Both ends of the coil are fixed to a collar provided in the vicinity of the support fitting. In such a through anchor, when the webbing is inserted into the oval ring, the coil is disposed at the sliding contact portion between the webbing and the through anchor, so that the webbing can be prevented from being displaced, The frictional resistance with the webbing can also be lowered.
[0008]
Also, Japanese Utility Model Publication No. 63-35013 proposes a through anchor for solving the above-described problem. This through anchor is provided with a resin bulging portion for guiding the webbing in a predetermined direction at the sliding contact portion with the webbing. The bulge portion is configured such that the bulge increases toward the rear of the vehicle body inside the through anchor while the through anchor is attached to the center pillar of the vehicle body. By doing so, the webbing that is in sliding contact with the bulging portion is led out to the front of the vehicle body. Further, since the surface of the bulge portion made of resin is in slidable contact with the webbing, the webbing can be led out in a predetermined direction and the belt can be prevented from being displaced.
[0009]
[Problems to be solved by the invention]
However, in the through anchor described in the Japanese Utility Model Publication No. 53-20087 described above, the manufacturing process becomes complicated by covering the coil of the ring of the round bar, and there is a concern that the manufacturing cost is increased accordingly.
Further, the through anchor described in Japanese Utility Model Publication No. 63-35013 described above has a drawback in that the frictional resistance is high because the sliding contact surface with the webbing is made of resin.
[0010]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a seat belt apparatus having a webbing guide in which the frictional resistance of the sliding contact surface with the webbing is low and the webbing is not offset in the belt slot. It is to provide.
[0011]
[Means for Solving the Problems]
The object of the present invention is to provide a webbing that restrains the occupant's body to the seat, and a webbing guide that slides into contact with the webbing and leads the webbing in a predetermined direction when restraining the occupant's body to the seat. In the seat belt apparatus provided, the webbing guide includes an insert metal fitting, a coating resin molded on the insert metal fitting, and a metal member that is attached to the coating resin and provides a surface that is in sliding contact with the webbing. The surface of the metal member 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.
[0012]
The surface of the metal member is preferably dull-finished.
Here, “dull finish” indicates the surface state of the cold-rolled steel sheet and steel strip, the outer peripheral surface of the cold-rolling roll is uniformly roughened, and the surface of the steel sheet is finished in a matte-like glossless state. Say things.
According to the seatbelt apparatus having the above-described configuration, the surface of the metal member that is in sliding contact with the webbing is processed into a satin finish by dull finish, so there is no need to perform shot blasting and complicated winding work is required. The frictional resistance of the webbing sliding contact surface can be reduced without using the coil. By doing so, since the webbing can smoothly slide on the surface of the metal member, the operability when the webbing is pulled out from the retractor and the webbing take-up property are good. Further, since the groove is provided on the surface of the metal member along the sliding direction of the webbing, when the webbing is tensioned in the sliding direction, 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 by the resistance of the groove to the force that a part of the webbing accommodated in the groove tries to get over the groove. Thus, the webbing is not offset in the belt slot, and the webbing is not twisted during the webbing pull-out / winding operation.
[0013]
Further, 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. When the thickness of the metal plate is smaller than 0.2 mm, a predetermined strength cannot be ensured when the metal member is mounted on the webbing guide. Further, if the thickness of the metal plate is larger than 0.8 mm, it is difficult to provide a groove in an arbitrary shape on the surface of the metal plate, and the attachment process when attaching the metal member to the resin portion of the webbing guide becomes complicated.
The groove | channel provided in the surface of a metal member should just be comprised so that a level | step difference may be provided on the plane of a metal member. For example, a recess formed from a gently curved surface or a recess formed from a folded curved 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 grooves may be increased or decreased in the width direction of the webbing, or the width and depth of the grooves may be increased or decreased.
Furthermore, the groove | channel corresponding to the groove | channel provided in the surface of the metal plate mentioned above may be provided in the outer surface of the resin part to which a metal member is attached. By carrying out like this, a metal member is attached without raise | generating a position shift with respect to the resin part.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, members and the like having the same configurations and functions as those already described are denoted by the same or corresponding reference numerals in the drawings, and description thereof is simplified or omitted.
[0015]
FIG. 1 shows a through anchor 10 that is a webbing guide of a seat belt apparatus according to an embodiment of the present invention.
[0016]
The through anchor 10 is formed by integrally forming a coating resin 12 on a metal fitting 13 formed by processing a single plate-like metal into a required shape by molding, and a metal member 13 is partially formed on the coating resin 12. Constructed by wrapping.
The insert fitting 11 is formed into a required shape by punching a metal plate such as a steel plate, for example, and the through anchor 10 is rotatably supported on the center pillar of the vehicle body at the upper portion (upper portion in the drawing) of the insert fitting 11. A bolt insertion hole 14 for inserting a bolt or the like is formed, and a belt slot 15 for inserting the webbing W is provided in the lower part (lower part in the figure). In order to ensure the load bearing performance of the through anchor 10, examples of the material of the insert metal fitting 11 include a carbon steel material (JIS SC material) having a predetermined plate thickness. Further, the insert fitting 11 may be heat-treated so that it can withstand a predetermined load.
[0017]
The coating resin 12 is molded on the insert fitting 11 near the belt slot 15 so as to have a required shape, and constitutes the lower part of the through anchor 10. In the vicinity of the belt slot 15 of the coating resin 12, a curved surface 12 a that protrudes toward the inner peripheral side of the belt slot 15 is formed. Further, although not shown, a groove for locking a metal member 13 described later is provided in the lower part of 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 polyamide resins such as polyamide 6, resins obtained by adding a reinforcing agent to polyacetal and polypropylene, or polycarbonate.
[0018]
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 becomes a webbing sliding contact surface that is a sliding contact surface with the webbing W. A state in which the webbing W is in sliding contact with the webbing sliding contact surface is indicated by a two-dot chain line in the drawing. In the figure, a plurality of recesses 13 a forming grooves are provided on the webbing sliding contact surface of the metal member 13. The recesses 13a are aligned in the width direction (left and right direction in the figure) of the webbing W of the metal member 13. Moreover, the webbing width direction end part 13b of the metal member 13 recedes in the anti-webbing direction from the webbing sliding contact surface.
The metal member 13 is made of a thin metal plate made of, for example, stainless steel, iron-based material aluminum alloy, titanium alloy, or the like that can withstand a predetermined load.
[0019]
FIG. 2 shows the metal member 13 before being attached to the through anchor 10. FIG. 2A shows a plan view of the metal member 13, and FIG. 2B shows a side view of the metal member 13.
The metal member 13 is a chrome-plated metal plate having a thickness of 0.3 mm whose surface is processed into a satin finish by dull finish, as shown in FIG. Is given. At this time, as shown in FIG. 2A, the four recesses 13a near the top of the metal member 13 (upper side in the figure) are aligned in the webbing width direction (left and right direction in the figure) of the metal member 13. In addition, the metal member 13 is disposed so as to extend in the sliding direction of the webbing (vertical direction in the drawing). The depth of the recess 13a becomes shallower from the top of the metal member 13 toward the webbing sliding direction of the metal member 13. A claw 13d is formed at the end 13c in the webbing sliding direction.
[0020]
Next, FIG. 3A is a cross-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 at 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 disposed on the top of the curved surface 12 a of the coating resin 12. The end 13c of the metal member 13 in the webbing sliding direction is accommodated in a groove 16 provided in the lower part of the coating resin 12 symmetrically with the insert metal fitting 11 interposed therebetween. Thereafter, the fixing rod 17 is inserted into the groove 16 from below the through anchor 10 (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 and pressed against the end 13c in the webbing sliding direction so that the metal member 13 is It is fixed to the fixing rod 17. Thus, the metal member 13 is fixed to the outer surface of the coating resin 12.
[0021]
FIG. 3B is a cross-sectional view taken along line BB in FIG. As described above, the webbing sliding contact surface of the metal member 13 is formed with the recess 13a. A housing recess 12d that engages with the recess 13a is formed on the outer surface of the coating resin 12 that contacts the recess 13a of the metal member 13. By doing so, the metal member 13 is fixed without causing positional displacement with respect to the curved surface 12a of the coating resin 12.
Further, when tension is generated in the sliding direction of the webbing W, a part of the webbing W is accommodated in the recess 13a.
[0022]
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 into a satin finish by dull finish, so that it is not necessary to perform shot blasting and is complicated. Therefore, it is not necessary to use a coil that requires a proper winding operation, and the frictional resistance between the webbing W and the webbing sliding contact surface can be lowered. By doing so, since the webbing W can smoothly slide on the webbing sliding contact surface, the operability when pulling out the webbing W from the retractor and the winding property of the webbing W are good. Further, since the recess 13a is provided on the surface of the metal member along the sliding direction of the webbing, when the webbing W is tensioned in the sliding direction, a part of the webbing W is stored in the recess 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 accommodated in the recess 13a is applied in the width direction of the webbing W due to the resistance of the recess 13a against the force that tries to get over the recess 13a. Power is countered. Thus, the webbing W is not offset in the belt slot 15, and the webbing W is not twisted during the webbing W drawing / winding operation.
[0023]
In addition, this invention is not limited to embodiment mentioned above, A suitable deformation | transformation, improvement, etc. are possible.
In the present embodiment, the recess 13 a on the webbing sliding contact surface is provided in the webbing sliding direction of the metal member 13, but the webbing W forms a predetermined angle with the webbing sliding direction of the metal member 13. When sliding, the recess on the webbing sliding contact surface may also be arranged to form a predetermined angle with the webbing sliding direction of the metal member 13.
[0024]
【The invention's effect】
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 offset on the sliding surface of the webbing guide. Furthermore, by using a metal member made of a thin metal plate having a dull finish on the webbing sliding contact surface, 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 apparatus showing an embodiment of the present invention.
2A and 2B are a plan view and a side view showing a metal member 13 before being attached to the through anchor 10. FIG.
3 is a cross-sectional view taken along line AA in FIG. 1 and a cross-sectional view taken along line BB in FIG.
FIG. 4 is a schematic perspective view showing a state in which an occupant 119 is restrained when the three-point seat belt device is mounted on a vehicle.
[Explanation of symbols]
10 Through anchor (webbing guide)
11 Insert metal fitting 12 Cover resin 12a Curved surface 13 Metal member 13a Recess (groove)
13b, 13c End portion 13d Claw 14 Bolt fitting insertion hole 15 Belt slot 16 Groove 17 Fixed rod W Webbing

Claims (5)

In a seat belt apparatus comprising: a webbing that restrains the occupant's body to a seat; and a webbing guide that slides into contact with the webbing and guides the webbing in a predetermined direction when restraining the occupant's body to the seat. The webbing guide is provided with a belt slot for inserting the webbing, and the webbing guide constitutes an insert fitting, a coating resin molded on the insert fitting, and a lower edge portion of the belt slot. A metal member that is attached to the coating resin and that provides a surface in sliding contact with the webbing, and a surface of the metal member in sliding contact with the webbing is provided with a groove along a sliding direction of the webbing. A seat belt device characterized by that.   The seat belt device according to claim 1, wherein the metal member provides a surface in sliding contact with the webbing of the metal member over the entire width direction.   The seat belt device according to claim 1 or 2, wherein the metal member is wound around the coating resin.   The seat belt device according to any one of claims 1 to 3, wherein a surface of the metal member that is in sliding contact with the webbing is dulled.   The seat belt device according to any one of claims 1 to 4, wherein the metal member is chrome plated.

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