JP2883259B2 - Seat belt through anchor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a through anchor for guiding webbing of a seat belt.

[0002]

2. Description of the Related Art In general, a through anchor of a seat belt is attached to a center pillar of a vehicle body, and guides a webbing extending upward from a lock-type retractor ELR so as to be slidably wrapped around the webbing so as to change its direction. is there.

[0003] When the seat belt is worn, the webbing passing through the through anchor crosses the chest of the occupant seated on the seat diagonally, passes through the tongue plate latched by the buckle at the end of the seat, traverses the waist of the occupant, and the other end of the seat. It is fixed near.

[0004] Webbing is pulled out and taken up when getting on and off. Particularly, when the webbing is pulled out, the webbing must be drawn out against the winding force of the retractor, and the friction in the through anchor portion that guides the webbing by folding it back is also drawn out. In this case, it has a great effect as resistance.

[0005] In order to reduce the pulling force of the webbing as much as possible, there has been proposed an example in which a portion of the through anchor around which the webbing is wound is made a rotatable roller to reduce the resistance.

For example, Japanese Unexamined Patent Publication No. 57-53114 discloses a roller having a holding hole formed in a peripheral wall of a roller rotating around a support shaft, and a rolling element inserted into the holding hole. Roller resistance is reduced by smoothing the rotation of the roller.

[0007]

However, the inertia mass of the roller together with the rolling element is large, the rotation followability of the movement of the webbing is not good, and the webbing is not smoothly pulled out and wound. In addition, when a load of about 100 kg is applied when the belt is used, it is conceivable that smooth rolling cannot be obtained due to dents in the rolling surface due to the rolling elements or intrusion of foreign matters such as dust.

Further, in an emergency, the ELR is locked and the occupant's body is supported by the webbing, and a large load is applied to the webbing. This large load is supported by the support shaft of the webbing turn-up portion of the through anchor and the mounting portion of the support shaft. And they must be constructed with high strength.
Therefore, making the shaft thicker increases the strength but increases the rolling resistance of the roller.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a through anchor which requires only a small pulling-out force of a webbing and can secure sufficient strength against a large load input. is there.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention guides a webbing attached to a vehicle body or a seat near a shoulder of an occupant and extending from a locking retractor of a seat belt. In a through anchor that changes the direction to the occupant side, a roller having a hollow bottomed cylindrical shape that is wound around the webbing and rotated in accordance with drawing and winding of the webbing, and the roller is rotatably supported at both bottom portions thereof. With the roller
Roller is supported by the central part corresponding to the hollow area of
A support shaft that is formed to have a large diameter with respect to both sides and is deformed on both sides with a small diameter when a load input of a predetermined value or more is applied, and the support shaft is supported at both ends and opposite to the side where the webbing of the roller is wound. And a bracket having a roller receiving portion formed on a side thereof.

An emergency load exceeding a predetermined value is applied via the webbing.
When it joins the roller, the cylindrical roller deforms
Press the center part of the large diameter of the support shaft, and
Deforming pressing rollers the roller receiving portion, the roller
-A large emergency load can be supported by the receiving part. Since a large axial strength is not required, the rotation of the roller can be made light and the webbing can be pulled out with a small force.

The roller is formed in a hollow shape to reduce the inertial mass to improve the rotational followability, and also to reduce the sliding contact area between the support shafts at both bottoms to reduce the rolling resistance so that the webbing can be pulled out with a small force. It is possible to smooth the movement of the webbing at the time of drawing and winding. Further, since the area of the roller in contact with the support shaft is small, deterioration over time is small. As described above, the strength and webin
And reduce the pull-out force of
Wear.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention shown in FIGS. 1 to 6 will be described below.

FIG. 1 shows a state of a driver's seat in a passenger compartment. An ELR unit 4 is built in a right rear side wall of a seat back 3 of a seat 2 on which a driver 1 sits.
The webbing 5 extending upward from the ELR unit 4 exits into the vehicle cabin through the opening 6, is wound around a through anchor 8 provided on the center pillar 7, is guided so as to be folded, and changes its direction. Of the seat 2 is slid diagonally downward and passes through a tongue plate 10 latched by a buckle 9 provided at the left end of the seat 2, crosses the waist of the driver 1, and has an end fixed near the right end of the seat 2.

The ELR unit 4 can wind the webbing 5 around the drum by a normal return spring, and can lock the webbing 5 in an emergency to prevent the webbing 5 from being pulled out.

The structure of the through anchor 8 provided on the center pillar 7 for guiding the webbing 5 extending upward from the seat back 3 to the occupant will be described below. FIG. 2 is an external view of the through anchor 8, FIG. 3 is a side view thereof, and FIG.
FIG.

A support member 12 is provided on the center pillar 7 so as to project horizontally toward the passenger compartment. A bracket 20 is provided below the support shaft 13 which is supported vertically through the support member 12 with respect to the vehicle. It is supported to swing freely in the horizontal direction.

The bracket 20 has a pair of left and right side portions 20b and 20c extending downward from both ends of a horizontal portion 20a pivotally attached to the support shaft 13 and bending forward. A support shaft 22 is provided between free ends of left and right side portions 20b and 20c of the bracket 20, and a roller 24 is pivotally supported on the support shaft 22 so as to be rotatable.

The webbing 5 is wrapped around the roller 24, and a roller receiving portion 21 is fixed to the opposite side to the wrapping side of the roller by connecting the leading edges of the left and right side portions 20b and 20c of the bracket 20. I have. Roller receiver 21 is a roller
It is formed in an arc shape along the outer circumference of the roller 24 in the vicinity of the roller 24.

A belt guide 26 covers the upper part of the webbing 5 wound around the roller 24 so as to swing up and down. In other words, the belt guide 26 is
b, 26c are the rollers 24 and the side portions 20b, 20c of the bracket 20
The upper wall 26a covers the upper portion of the webbing 5 by connecting the left and right side portions 26b and 26c between the support shaft 22 and the upper wall 26a. Along the flat portion extending from the winding portion of the webbing 5, the tip extending from the webbing 5 at an appropriate length forms a belt outlet guide portion 26 d having a flat rectangular opening. It passes through the opening of the belt outlet guide 26d.

Therefore, the webbing 5 extends upward from the ELR unit 4 to extend through the bracket of the through anchor 8.
The belt 20 is wound around the roller 24 passing between the left and right side portions 20b and 20c of the belt 20, and the belt guide 26 covers above the wound webbing 5 and guides the left and right sides of the webbing 5 to the side portions 26b and 26c of the belt guide 26. Then, the webbing 5 extends through the opening of the belt exit guide portion 26d at the tip of the belt guide 26.

The cross section of the opening of the belt outlet guide 26d is the same as the cross section of the webbing 5 and slightly larger, so that the belt guide 26 swings up and down following the movement of the occupant-side extension 5a of the webbing 5. Move and pull out webbing 5
The belt guide 26 does not become a resistance at the time of winding, and even if the occupant-side extension 5a is twisted,
The belt is fixed by the belt exit guide 26d at 26 and is always wound around the roller 24 in an appropriate state.

The roller 24 around which the webbing 5 is wound is supported by a bracket 20 which is pivotally supported on a support shaft 13 which is directed vertically to the vehicle.
The roller 24 itself can be swung freely on a horizontal surface to change its direction while maintaining a horizontal posture.
24 can be directly opposed. Therefore, the center axis of rotation of the roller 24 is always orthogonal to the direction in which the webbing 5 is pulled out, so that the webbing 5 can be prevented from being shifted left and right.

The roller 24 on which the webbing 5 is wound and whose direction can be changed in this way has a hollow bottomed cylindrical shape as shown in a sectional view in FIG.
At the center of the bottoms 24b, 24c at both ends of the roller, there are circular holes of bearings 24d, 24e, through which the support shaft 22 penetrates, and the roller 24 is rotatably supported.

The portion of the support shaft 22 that slides on the bearings 24d and 24e of the roller 24 has a small diameter and a small sliding contact area, so that rolling resistance is small and deterioration over time is small. Also roller
24 has a low inertial mass because it is hollow, and has good rotation followability with respect to the movement of the webbing 5. Therefore webbing 5
Can be easily drawn with relatively small force, and the movement is smooth and easy to handle.

A core 23 is formed integrally with the support shaft 22 so as to substantially occupy the hollow interior of the roller 24.
The core material 23 has a substantially cylindrical shape, and the outer diameter is a cylindrical portion 24 of the roller 24.
The inner diameter is slightly smaller than the inner diameter a, and the inner diameter is slightly larger than the diameter of the support shaft 22. The central portion of the inner peripheral surface is fitted to the support shaft 22 with the diameter further reduced.

The inside of the roller 24 is structured as described above. When the webbing 5 is normally pulled out and taken up, only the roller 24 supports the webbing 5 to be wound and follows the movement of the webbing 5. Rotate.

If the webbing 5 is suddenly pulled out due to the movement of the occupant in an emergency, the ELR unit 4 operates to prohibit the webbing 5 from being pulled out. The extension portion is simultaneously pulled, so that a large load is applied to the roller 24 in a direction opposite to the side where the webbing 5 is wound.

As shown in FIG. 6, the roller 24 is deformed by a load equal to or greater than a predetermined value to press the core member 23, and the core member 23 deforms the small-diameter support shaft 22 and moves to the roller receiving portion 21 side. As a result, the roller 24 is pressed against the roller receiving portion 21, and the roller receiving portion 21 of the bracket 20 eventually supports a large emergency load.

Therefore, since a large axial strength is not required, the roller 24 is hollowed to reduce the pull-out force as described above, and both the strength when a large load is input and the pull-out force of the webbing 5 are reduced. Can be compatible.

In the above embodiment, the through anchor is attached to the center pillar of the vehicle body. However, in the case of a two-door vehicle or open car, the through anchor may be provided at the shoulder of the seat back. FIGS. 7 and 8 show an example in which the through anchor 32 is attached to the shoulder of the seat back 30.

A headrest 31 is provided on the right shoulder of the seat back 30.
The roller 33 is rotatably supported by a support shaft 34 oriented substantially horizontally in the left and right direction, and a webbing 36 extending obliquely upward and forward from a retractor at the rear is provided with a roller 33. And extends obliquely downward and forward.

The roller 33 and the internal structure are the same as those of the above-described embodiment.
A core material is fitted to 34. A roller receiver 35 is provided below the roller 33.

The webbing 36 is formed by the hollow structure of the roller 33.
The roller 33 and the support shaft 34 deform when a large load is applied in an emergency, and the roller receiving part
Can support at 35.

[0035]

The present invention reduces the rotation of the roller around which the webbing is wound to reduce the webbing withdrawal force, and at the same time, when a load exceeding a predetermined value is applied to the roller via the webbing, the support shaft is deformed. The load can be supported by the roller receiver, and both the reduction of the webbing withdrawal force and the securing of strength when a large load is input can be achieved at the same time. The roller has a hollow structure, and the sliding contact area with the support shaft is reduced to reduce aging and reduce the webbing withdrawal force.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in a vehicle cabin according to an embodiment of the present invention.

FIG. 2 is an external view of a through anchor of the same example.

FIG. 3 is a side view of the same.

FIG. 4 is a front view of the same.

FIG. 5 is a sectional view taken along line VV of FIG. 3;

FIG. 6 is a sectional view similar to FIG. 3 when a large load is applied to the roller.

FIG. 7 is a front view showing an example in which a through anchor is provided on a shoulder portion of a seat belt.

FIG. 8 is a side view of the same.

[Explanation of symbols]

1 ... Driver, 2 ... Seat, 3 ... Seat back, 4 ... EL
R unit, 5 ... webbing, 7 ... center pillar, 8
... through anchor, 9 ... buckle, 10 ... tongue plate, 12 ... support member, 13 ... support shaft. 20 bracket, 21 roller receiving part, 22 support shaft, 23 core material, 24 roller, 26
... belt guide, 30 ... seat back, 31 ... headrest, 32 ... through anchor, 33 ... roller, 34 ... support shaft,
35: Roller receiver, 36: Webbing.

Claims (1)

(57) [Claims] 1. A through anchor attached to a body or a seat of an automobile near a shoulder of an occupant and extending a webbing extending from a locking retractor of a seat belt to change a direction toward an occupant, wherein the webbing is wound around the webbing. A roller having a hollow cylindrical shape with a bottom that rotates in accordance with drawing and winding of the roller; and a roller that rotatably supports the roller at both bottom portions thereof and has a central portion corresponding to a hollow region of the roller.
The support shaft is formed to have a large diameter with respect to both sides supporting the roller, and the both sides of the small diameter are deformed by a load input of a predetermined value or more, and the webbing of the roller is supported while supporting the support shaft at both ends thereof. And a bracket having a roller receiving portion formed on the opposite side to the side.