JP3516876B2 - Tongue plate for seat belt device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat belt device installed in an automobile or the like, and more particularly to a structure of a tongue plate detachably attached to a buckle fixed to a vehicle body.

[0002]

2. Description of the Related Art A seat belt device provided in an automobile is used to secure the safety of an occupant by restraining the occupant on a seat in the event of a vehicle collision. For example, a three-point support type as shown in FIG. The seat belt device 1 of 1 is common. The seat belt device 1 includes a belt-shaped webbing 3 made of synthetic fibers and a winding mechanism (not shown) that automatically winds the webbing 3 with a weak force that does not hinder the movement of an occupant in normal use. ) And a retractor 4 having a lock mechanism (not shown) that locks the winding mechanism when an acceleration of a predetermined value or more is applied, and a tongue plate 50 and a buckle 6 as a seat belt attaching / detaching mechanism. There is.

The retractor 4 and the buckle 6 are attached and fixed to the vehicle body on the left and right sides of the front seat 2, respectively, and the extended end 3a of the webbing 3 is fastened to the anchor member 8 of the retractor 4 via the metal fitting 7. It is fixed. In the middle of the webbing 3, a ring member 9 disposed above the front seat 2 is slidably suspended and supported, and the ring member 9 is anchored to a vehicle body through a metal fitting 10. It is fastened and fixed to 11.

The seat belt device 1 pulls out the webbing 3 while seated on the front seat 2 and connects the tongue plate 50 to the buckle 6. Of the webbing 3 pulled out by this, the portion that is slid over the tongue plate 50 and the ring member 9 is the shoulder of the occupant, and the portion that is slid over the tongue plate 50 and the metal fitting 7 in the horizontal direction. Restrains the occupant's waist.

If a frontal collision of the vehicle occurs in such a state, a time lag may occur until the lock mechanism built in the retractor 4 operates, and the webbing 3 may be displaced in a direction to loosen the restraint of the occupant. In order to reduce the deviation of the webbing 3, a pretensioner ELR belt or the like has been developed which employs a mechanism for instantly tightening the seat belt at the time of a collision to increase the restraining force of the occupant.

[0006] However, with the recent increase in required quality regarding safety, further improvement in safety is expected in the future. The seat belt tightening mechanism described above is built in the retractor 4 because of its mounting space.
Therefore, even when the seat belt tightening mechanism is activated, the restraint on the occupant is first close to the retractor 4,
There is a tendency that it acts on the portion that is slid over the tongue plate 50 and the ring member 9, and the action on the portion that is slid over the tongue plate 50 and the metal fitting 7 in the horizontal direction is slightly delayed. Therefore, in the future, it will be necessary to keep the displacement of the portion for restraining the waist of the occupant, which is horizontally stretched, small.

Looking at the conventional tongue plate,
As shown in FIGS. 12 and 13, a long hole 53 into which a webbing 54 is slidably inserted is formed in the base portion 50b of a tongue plate body 50 having a convex shape including an insertion portion 50a and a base portion 50b. A general structure is one in which a thick resin member 51 is formed on the outer surface of the base 50b.
This structure is not sufficient to reduce the above-mentioned deviation and increase the restraining force.

[0008]

Here, in order to prevent the displacement of the webbing at the initial stage of the collision, for example, as shown in FIG.
And, as shown in FIG. 11, the tongue plate body 41 and the resin member 42 are made movable relative to each other, and the elongated force inner surface 41a of the tongue plate body 41 and the elongated hole inner surface 42a of the resin member 42 are made by the tensile force at the time of collision. It is conceivable to sandwich and fix the webbing 43. Accordingly, the webbing 43 is fixed at the same time as the collision, and it becomes possible to prevent the webbing from being displaced.

However, in the case where the tongue plate body and the resin member can be moved relative to each other as described above, the tongue plate body and the resin member move relative to each other when the webbing is wound or pulled out, so that the webbing is removed. There is a problem that handleability deteriorates, such as being pinched. In addition, when inserting the webbing into the tongue plate, it is necessary to fix the long holes of the both with a jig or the like and insert the webbing, and there is a problem that workability is low.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tongue plate for a seat belt device capable of preventing deviation of the webbing at the initial stage of a collision while improving handling and workability. .

[0011]

According to a first aspect of the present invention, there is provided a seat belt device for restraining an occupant to a seat at the time of a vehicle collision, and an insertion portion attached to a buckle fixed to a vehicle body and an occupant supported. A tongue plate main body comprising a base portion having a long hole through which a webbing is slidably inserted and a member movable relative, between the resin member and the tongue plate body, in normal use to retain the resin member in a position to allow free movement of the webbing, car
A holding means for releasing the holding of the resin member and holding the webbing between the tongue plate body and the resin member when a tensile force of a predetermined value or more is applied to the webbing due to the impact force of both collisions is provided. It has a feature.

According to a second aspect of the present invention, in the first aspect, the holding means holds the resin member immovably by locking the tongue plate body, and releases the holding when the tensile force acts. The present invention is characterized in that a holding portion that can be moved relatively is formed integrally with the resin member.

According to a third aspect of the present invention, in the first aspect, the holding means holds the resin member immovably by locking the tongue plate body, and releases the holding when the tensile force acts. It is characterized in that a separate member that is relatively movable is attached to the resin member.

[0014]

According to the tongue plate of the present invention,
The tongue plate body and the resin member can be moved relative to each other,
Since the holding means for holding the resin member in the normal position with respect to the tongue plate body is provided, the resin member is held in the position allowing the free movement of the webbing in the normal use state. Winding up,
The tongue plate does not get caught when it is pulled out, and it is easy to handle. In addition, a jig for inserting the webbing into the long hole of the tongue plate can be eliminated, workability can be improved, and cost can be reduced by the amount that the jig is unnecessary.

When the tensile force acts on the webbing due to the impact force at the time of a vehicle collision, the holding of the resin member is released, so that the tongue plate body and the resin member move relative to each other and the webbing is clamped by both. As a result, the deviation of the webbing at the initial stage of the collision is prevented and the safety can be further improved.

According to the second aspect of the present invention, since the holding portion which is locked to the tongue plate body and sheared by the tensile force is integrally formed with the resin member, the holding portion is formed in the step of forming the resin member on the tongue plate body. They can be formed at the same time and productivity can be improved.

According to the third aspect of the present invention, since the separate member is attached to the resin member, the tongue plate main body and the resin member can be manufactured separately and then assembled together, and then the different member can be attached. In addition, the mold for the resin member can be made smaller.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 are views for explaining a tongue plate of a seat belt device according to a first embodiment of the present invention (claims 1 and 2).
Is a plan view of the tongue plate, FIG. 2 is a cross-sectional plan view of the resin portion of the tongue plate (cross-sectional view taken along line II-II in FIG. 3), and FIG. 3 is a cross-sectional side view of the tongue plate (cross-sectional view taken along line III-III in FIG. 1). ), FIG. 4 is a cross-sectional side view showing a state in which a tensile force acts on the tongue plate.

The tongue plate 5 of the present embodiment includes a tongue plate body 15 made of a sheet metal having a convex shape, which includes an insertion portion 15a and a base portion 15b, and a resin member 16 which is formed so as to surround the outer surface of the base portion 15b. It consists of A rectangular lock hole 15c is formed in the insertion portion 15a.

The base portion 15a of the tongue plate body 15
The rectangular long hole 15d is formed in the
A flange portion 15e is bent and formed at the rear end edge of a so as to stand upright. Further, on the front side of the elongated hole 15d of the base portion 15a, a pair of holding holes 1 constituting one side portion of the holding means.
5f and 15f are formed.

The number, size, shape, and setting position of the holding holes 15f are appropriately selected depending on a predetermined load for releasing holding, productivity, and the like. Therefore, the number of the holding holes 15f may be one or three or more, and the setting position is the long hole 15d.
It may be on the rear side.

The resin member 16 is formed thick so that it can be easily grasped, and long holes 16a and 16f are formed in a portion of the resin member 16 facing the long hole 15d.
The long holes 16a and 16f are staggered in the front and rear and are formed so as to be connected to each other in a recess 16d described later. The webbing 3 is attached to these long holes 15d, 16a, and 16f.
The webbing 3 has one side 3b extending to the shoulder of the occupant and the other side 3c extending to the waist.

In this embodiment, the rear wall 16g of the elongated hole 16f is formed.
Since the holding is released by being pulled rearward, the other side 3c of the webbing 3 which directly pulls the rear wall 16g restrains the waist portion side, which has a large movement. Of course, one side 3b of the webbing 3
The passenger's waist may be held by the shoulder on the other side 3c side.

When viewed in the buckle mounting direction of the tongue plate 5 (in the direction from the drawing to the mark a), the elongated hole 1 of the resin member 16 is formed.
The flange portion 15e of the tongue plate body 15 is in contact with the rear inner surface 16b of 6a. Also, the long hole 16a
The long hole 15d of the tongue plate body 15 at the front edge of the
A convex portion 16c protruding inward is formed. This convex part 1
The front inner surface 15g of the elongated hole 15d of the tongue plate body 15 is in contact with 6c, and the rear inner surface 15g of the elongated hole 15d is in contact with 6c.
The upper edge of h is facing.

Further, the resin member 16 is formed with a recess 16d extending in a direction perpendicular to the elongated hole 16a, and the base portion 15b of the tongue plate body 15 is movably inserted into the recess 16d. The tongue plate body 15 moves until the rear inner surface 15h comes into contact with the convex portion 16c, whereby the convex portion 16c and the rear inner surface 1 are moved.
The webbing 3 is clamped by 5h.

The inside of each holding hole 15f of the tongue plate body 15 is filled with a holding portion 16e which constitutes the other side portion of the holding means, and each holding portion 16e is formed integrally with the resin member 16. . Each of the holding portions 16e, 1
6e is formed at the same time when the resin member 16 is covered and molded, so that the resin member 16 is held immovably in a position allowing the sliding of the webbing 3 with respect to the tongue plate body 15. There is.

The operation and effect of this embodiment will be described.
In the seat belt device according to the present embodiment, when a tensile force of a predetermined value or more acts on the webbing 3 due to the impact force at the time of a vehicle collision, the locking mechanism of the retractor locks or tightens the webbing 3, thereby restraining the occupant to the seat. It is configured. At the initial stage of this collision, the webbing 3 is conventionally slightly displaced from the tongue plate 5.

On the other hand, in the first embodiment of the present invention, the holding member 16e is sheared by the tensile force acting on the tongue plate body 15 and the resin member 16, and the two members 15 and 16 move relatively to each other so that the convex portion is formed. The webbing 3 is sandwiched between 16c and the rear inner surface 15h. As a result, the webbing 3 is fixed, and the webbing 3 at the initial stage of the collision.
Is prevented from shifting.

On the other hand, in a normal use state, the resin member 16 is held at a position where the waving 3 is easily moved because the holding portion 16e is engaged with the tongue plate body 15, so that the seat belt The tongue plate 5 is not caught when the webbing 3 is taken up or pulled out at the time of attachment / detachment, and the handling can be easily performed. Further, when the webbing 3 is inserted into the tongue plate 5, since the long holes 15d and 16a are held in an open state, it is possible to eliminate the need for the insertion work by a jig and improve the workability, and the jig is unnecessary. The cost can be reduced accordingly.

In the first embodiment, the case where the holding portion 16e integrally formed with the resin member 16 is engaged with the holding hole 15f of the tongue plate body 15 as the holding means has been described. The holding means according to the invention is not limited to this.

For example, as shown in FIG. 5, the resin member 16
A holding portion 20 for holding the resin member 16 immovably in contact with the front surface of the tongue plate body 15 is integrally formed in the concave portion 16d of the tongue plate body 15. When a tensile force of a predetermined value or more is applied, the holding portion 20 is broken by the shearing force. Alternatively, the holding may be released.

Further, as shown in FIG. 6, the resin member 16 may be integrally formed with a holding claw 21 that is immovably locked in the holding hole 15f of the tongue plate body 15. In any of these cases, the same effect as the first embodiment can be obtained.

Next, the tongue plate of the seat belt device according to the second embodiment of the present invention (claims 1 and 3) is shown in FIG.
And it demonstrates based on FIG. 7 is a plan view of the tongue plate, and FIG. 8 is a side sectional view of the tongue plate (see FIG. 7).
VIII-VIII line sectional view).

The tongue plate in this embodiment comprises a tongue plate body 17 made of sheet metal and a resin member 18. The tongue plate body 17 made of sheet metal has a convex shape including an insertion portion 17a and a base portion 17b. The insertion portion 17a has a rectangular lock hole 17c and a base portion 1.
A rectangular elongated hole 17d is formed in 7b. The tongue plate of this embodiment has basically the same shape as the tongue plate body of the first embodiment, except that it does not have a bent portion such as a flange and is flat as a whole. .

An upper elongated hole 18a and a lower elongated hole 18d are staggered in the front and rear at a portion of the resin member 18 facing the elongated hole 17d, and the upper elongated hole 18a is formed from the front side of the resin member 18.
The lower elongated hole 18d and the lower elongated hole 18d are formed so as to be connected to each other in a slit-shaped recess 18b extending in the perpendicular direction. The concave portion 18b does not have the convex portion 16c as in the first embodiment.

Through holes 17f and 18f are formed in the resin member 18 and the tongue plate main body 17 so as to be coaxial with each other, and the through holes 17f and 18f are holding pins of another member formed of a resin material or the like. 19 (holding means) is attached. This holding pin 19 can be attached by press fitting,
Screwing and heat staking after insertion are used.

As described above, in the tongue plate of the second embodiment, the tongue plate body 17 made of sheet metal and the resin member 18 are
Can be separately manufactured, and the tongue plate body 17 made of sheet metal can be assembled by inserting the holding pin 19 after inserting the tongue plate main body 17 into the concave portion 18b of the resin member 18, as compared with the case of the first embodiment. The mold can be made smaller.

Further, in the second embodiment of the present invention, the holding pin 19 is sheared by the pulling force of the webbing, the tongue plate body 17 and the resin member 18 relatively move, and the front side surface 18c of the elongated hole 18a and the elongated hole 18d. Rear side 1
The webbing 3 is clamped by 8c. As a result, the webbing 3 is fixed, the displacement of the webbing 3 at the initial stage of the collision is prevented, and the same effect as that of the first embodiment is obtained.

In the second embodiment, the through hole 17
Although the case where the holding pin 19 is attached to f and 18f has been described, the holding means according to the invention of claim 3 is not limited to this.

For example, as shown in FIG. 9, a resin member 18
Alternatively, the screw 23 may be screwed onto the tongue plate body 17, and the tongue plate body 17 may be tightened to hold the screw 23 immovably.
In this case, the groove 24 is formed in the tongue plate main body 17 so that the tongue plate main body 17 can be relatively moved by friction due to tensile force.

[Brief description of drawings]

FIG. 1 is a plan view illustrating a tongue plate of a seat belt device according to a first exemplary embodiment of the present invention.

FIG. 2 is a sectional plan view of the tongue plate (II-I in FIG. 3).
It is a sectional view taken along line I).

FIG. 3 is a sectional side view of the tongue plate (III- of FIG.
It is a sectional view taken along line III).

FIG. 4 is a sectional side view showing a state in which a tensile force acts on the tongue plate.

FIG. 5 is a cross-sectional plan view showing a tongue plate according to a modification of the first embodiment.

FIG. 6 is a sectional side view showing a tongue plate according to another modified example of the first embodiment.

FIG. 7 is a plan view showing a tongue plate according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional side view (cross-sectional view taken along the line VIII-VIII in FIG. 7) showing the tongue plate of the second embodiment.

FIG. 9 is a sectional side view showing a modified example of the second embodiment.

FIG. 10 is a cross-sectional side view of the tongue plate for explaining the formation process of the present invention.

FIG. 11 is a cross-sectional side view of a tongue plate for explaining a formation process of the present invention.

FIG. 12 is a plan view showing a conventional tongue plate.

FIG. 13 is a sectional view showing a conventional tongue plate.

FIG. 14 is a diagram showing a general three-point seat belt.

[Explanation of symbols]

3 webbing 5 tongue plate 15,17 tongue plate body 15a insertion part 15b base 15d long hole 15f holding hole (holding means) 15h Rear inner surface (inner edge) 16,18 Resin material 16a long hole 16c Convex part (inner edge) 16e, 20 holding portion (holding means) 19 Holding pin (holding means) 21 Holding claw (holding means) 23 screws (holding means)

Claims (3)

(57) [Claims] 1. A seatbelt device for restraining an occupant to a seat in the event of a vehicle collision, and a long portion in which a webbing for supporting an occupant is slidably inserted into an insertion portion attached to a buckle fixed to a vehicle body. In a tongue plate formed by coating a resin member on the outer surface portion of the tongue plate body including a base portion having a hole except for the long hole, the tongue plate body and the resin member are relatively movable, and the resin member between the tongue plate body, normal use form
In this state, the resin member is held at a position that allows the webbing to move freely, and when a tensile force of a predetermined value or more is applied to the webbing due to the impact force at the time of a vehicle collision, the resin member is released from the hold and the tongue is released. A tongue plate for a seat belt device, comprising holding means for holding the webbing between a plate body and a resin member. 2. The holding means according to claim 1, wherein the holding means holds the resin member immovably by locking it to the tongue plate body, and releases the holding when the tensile force is applied to enable relative movement. A tongue plate for a seat belt device, wherein a holding portion is formed integrally with the resin member. 3. The holding means according to claim 1, wherein the holding means holds the resin member immovably by being locked to the tongue plate body, and when the tensile force is applied, the holding means is released to allow relative movement. A tongue plate for a seat belt device, characterized in that another member is attached to the resin member.