JP3449022B2 - Web adjuster for child seat - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web adjuster for locking the occupant protection webbing of a child seat by adjusting its length.

[0002]

2. Description of the Related Art An example of a child seat belt device for a child seat will be described with reference to FIG. The base end of the strap 14 is fixed to the center of the front edge of the seat 12 of the child seat 10, and the buckle 16 is attached to the tip of the strap 14. The tongues 22 and 24 are attached to the right webbing 18 worn on the right half of the child sitting on the child seat 10 and the left webbing 20 worn on the left half of the child, respectively.
2, 24 are inserted into the buckle 16 and locked.

The front ends of the webbings 18 and 20 are fixed to the rear portion of the seat portion 12. Webbing 18,2
The rear end side of 0 is from the swallowing openings 26, 28 of the backrest 25 of the child seat 10 to the backrest 25 of the child seat 10.
It is routed to the rear side of the backrest 25 and is connected to the base end of the tightening webbing 30 at the rear side of the backrest 25.

The front end 30a of the tightening webbing 30 is pulled out of the child seat 10 through the lower side of the seat 12 through the outlet 32 on the front surface of the child seat 10. A web adjuster 34 for locking the fastening webbing 30 is provided below the seat portion 12 of the child seat 10.

A conventional example of the web adjuster 34 will be described with reference to FIG.

A cam 40 is inserted into the case 36 by a pin 38.
Is pivotally supported. The cam 40 holds the tightening webbing 30 between it and the webbing retainer wall 42 to prevent movement in the direction of arrow B in FIG.
A plurality of ridges 44 are provided on the surface facing the surface 2. The cam 40 is biased in the webbing holding direction by a spring 46 wound around the pin 38. A tension member 48 is connected to the cam 40. By pulling the pulling member 48 in the arrow C direction, the cam 40 is separated from the pressing wall 42, and the tightening webbing 30 can be moved not only in the arrow A direction but also in the B direction.

When the tip 30a of the tightening webbing 30 is pulled by hand, the cam 40 rotates clockwise in FIG. 5 to move the tightening webbing 30 in the A direction, and the left and right webbing 1
8 and 20 are drawn into the swallows 26 and 28, and the looseness of the webbing 18 and 20 is removed. When the hand is released from the tip 30a, the fastening webbing 30 is bitten between the cam 40 and the pressing wall 42 in this state, so that the webbing 1
The return of 8 and 20 is blocked, and the child sitting in the child seat 10 is firmly restrained.

[0008]

SUMMARY OF THE INVENTION A first object of the present invention is for a child seat which can strongly clamp the fastening webbing between the pressing wall and the cam, thereby reliably preventing the fastening webbing from returning. To provide a web adjuster.

A second object of the present invention is to provide a web adjuster for a child seat which can quickly hold the webbing.

A third object of the present invention is to provide a web adjuster for a child seat having good durability of webbing.

[0011]

According to another aspect of the present invention, there is provided a web adjuster for a child seat, which is rotatable about a pivot axis, and is provided with a webbing contact surface having a plurality of protrusions for stopping the webbing. A cam, a case that pivotally supports the cam, a webbing pressing wall that is provided on the case and faces the webbing contact surface of the cam, and a direction in which the webbing contact surface overlaps the webbing press wall. In a web adjuster for a child seat including a spring for urging the cam so as to rotate, the webbing pressing member is a slide plate movable in the moving direction of the webbing, and A corrugated portion having a curved surface is provided on each surface facing the cam, and the facing surface of the cam is adjacent to the corrugated portion in the biting direction of the webbing. And has teeth provided in the confronting surfaces of the slide plate, is characterized in that the flat portion adjacent to the corrugated part is provided in the 咬込 direction of the webbing.

According to a second aspect of the present invention, there is provided the web adjuster for a child seat according to the first aspect, wherein the case has a pair of side walls and a bottom wall connecting the side walls, and the slide plate is slidable on the bottom wall. And the cam is pivotally supported on a shaft that is installed between the side walls, and the facing surface of the cam is located on the webbing with respect to a perpendicular line extending from the axial center of the shaft to the bottom wall. Is located on the opposite side of the biting direction.

According to a third aspect of the present invention, there is provided the web adjuster for a child seat according to the second aspect, wherein an opening for inserting a webbing is provided in the bottom wall in the biting direction rather than the slide plate.

[0014]

In the web adjuster for a child seat according to the present invention, the webbing is passed between the cam and the slide plate. In the steady state, the teeth of the cam are lightly pressed against the webbing.

When a strong tension is applied to the webbing at the time of a vehicle collision, the cam slightly rotates and the webbing is strongly sandwiched between the wave portion of the cam and the wave portion of the slide plate.
At this time, the slide plate moves a little along with the cam, and the wave portions are entirely overlapped with each other.

In the child seat web adjuster of the second aspect, since the direction in which the webbing is bitten coincides with the direction in which the webbing is clamped, the webbing is remarkably strongly clamped.

In the web adjuster for a child seat according to a third aspect of the present invention, the cam is smoothly rotated by pulling the webbing from below the bottom wall between the slide plate and the cam.

[0018]

1 to 3 are sectional views of a child seat web adjuster 50 according to an embodiment, and FIG. 4 is an exploded perspective view of the web adjuster.

A pair of side walls 52, 52 and these side walls 52,
U-shaped case 5 having a bottom wall 54 connecting 52 to each other
A cam 58 is pivotally supported on the shaft 6 by a shaft 60.
The shaft 60 is inserted through pin holes 62, 62 provided in the side walls 52, 52. The shaft 60 is fastened to the case 56 by attaching an E ring 66 to the tip of the shaft 60.

The cam 58 includes a cylindrical column 68 into which the shaft 60 is inserted, a flat plate-shaped lever 70 extending leftward with respect to the column 68 in FIG. And a block 72 extending downward. On the tip end surface of the block 72 (the surface opposite to the column 68 across the block 72), a wave portion 74 formed of a curved surface,
Pointed teeth 76 are provided. The corrugated portion 74 and the teeth 76 are formed of a convex strip and a concave strip extending in a direction parallel to the longitudinal direction of the column 68, respectively.

Pins 78 and 80 are provided on the side surface of the cam 58 so as to project therefrom. A recess 52a in which the pins 78 and 80 are inserted is provided on the upper side of the side wall 52 of the case 56, and the rotation range of the cam 58 is the recess 52a and the pin 7.
It is regulated by 8 and 80.

A slide plate 82 is provided on the bottom wall 54 of the case 56 so as to face the tip surface of the block 72. This slide plate 82 is a block 7
The second corrugated portion 74 is provided with a corrugated portion 84 formed of a convex strip and a concave strip extending in a parallel direction, and a flat portion 86. This wave part 8
4 is also a curved curved surface similar to the wave portion 74.

The bottom wall 54 of the case 56 has a slot-like opening 94 for passing the fastening webbing 90, a support hole 96 for the slide plate 82, and a bolt hole 98 for fixing the case 56 to the child seat. And are provided.

From the bottom surface of the slide plate 82, an anchor 100 inserted into this support hole 96 is provided so as to project. On the anchor 100 and the inner surface of the support hole 96, convex portions 102 and 104 are provided so as to face each other. A compression coil spring 106 is interposed between the convex portions 102 and 104, and the coil spring 106 urges the slide plate 82 to the left in FIGS. The coil spring 10
Both ends of 6 are fitted on the convex portions 102 and 104.

Although not shown in the drawings, a protrusion is provided from the lower end of the anchor 100 to the lower surface of the bottom wall 54, so that the slide plate 82 does not separate from the bottom wall 54, and the slide plate 82 bottoms. It is slidable along the upper surface of the wall 54.

A coil portion 110 of a torsion coil spring 110 with respect to a shaft 60 inserted in a column 68 of a cam 58.
a and 110b are externally fitted. This coil part 110
A tie portion 110c connecting a and 110b is engaged with a groove 112 between the column 68 and the lever 70. Spring end portion 110 extending from the coil portions 110a and 110b
d and 110e are locked to the slits 114 and 116 of the side wall 52.

The child seat 120 provided with the child seat web adjuster 50 has a fifth or sixth construction.
Shown in the figure.

A buckle 124 is attached to the center of the front edge of the seat 122 of the child seat 120, and the buckle member 12 is attached.
Six tongs 128 are attached to the buckle 124. A right webbing 130 worn on the right half of the child sitting on the child seat 120 and a left webbing 132 worn on the left half of the child are connected to the upper part of the floor member 126. The tongue 1 is attached to the lower end of the floor member 126.
28 is fixed.

The rear ends of the webbings 130 and 132 are provided with swallowing openings 142 of the backrest 140 of the child seat 120.
It is pulled out from the back of the backrest 140 from 144, and is connected to the hook 134 behind the backrest 140.
One end of the tightening webbing 90 is connected to the hook 134.

The tightening webbing 90 passes under the seat portion 122, and from the front surface of the seat portion 122 the child seat 120.
It has been pulled out. A recess 146 (FIG. 6) is provided in the center of the front surface of the seat 122.
A web adjuster 50 that locks the tightening webbing 90 is provided in the inside 6.

This tightening webbing 90 has the right and left webbings 130, 130 shown in FIGS.
It is connected to 132 and the left side is pulled out to the front part of the child seat 120.

The tightening webbing 90 is drawn between the slide plate 82 and the block 72 through the long hole 94.

As shown in FIGS. 1 and 2, the tip end surface of the block 72 is always located on the left side of the figure, that is, on the front edge side of the seat portion 122 with respect to the perpendicular line from the axis of the shaft 60 to the bottom wall 54. . Therefore, when the tightening webbing 90 is pulled leftward in FIG. 1, the tightening webbing 90 smoothly passes between the block 72 and the slide plate 82 without any constraint.

As shown in FIG. 1, the teeth 76 of the block 72 are
Are located closer to the opening 94 than the corrugated portion 74. This tooth 7
6 faces the flat portion 86 of the slide plate 82. The wave portion 74 of the block 72 faces the wave portion 84 of the slide plate 82.

The web adjuster 5 configured in this way
The use of 0 and the child seat 120 including the same will be described below.

Remove the tong 128 from the buckle 124,
The floor member 126 is lifted up. Next, sit the child 12
The child's head is passed between the webbing 130 and 132, and the tongue member 126 is set so that the interstitial member 126 is in front of the child and between the left and right legs, and the tongue 128 is latched to the buckle 124. . Next, the end 90a of the tightening webbing 90 is pulled toward you.

Then, the tightening webbing 90 moves leftward in FIG. 1 between the slide plate 82 and the block 72 without any constraint. When the hand is released from the tightening webbing 90, the tightening webbing 90 is sandwiched between the block 72 and the slide plate 82 as shown in FIG. At this time, the tightening webbing 90 is held between the flat portion 86 of the slide plate 82 and the teeth 76 of the block 72. By biasing the cam 58 with the spring 110, the tips of the teeth 76 are lightly pressed against the fastening webbing 90, and the fastening webbing 90 is prevented from moving to the right.

When the child is lowered from the child seat, the lever 70 of the cam 58 is pulled upward as shown in FIG. As a result, the block 72 and the slide plate 8
There is a gap between the two and the fastening webbing 90 can move freely to the right in FIG. Therefore, the webbing 13
Loosen 0 and 132, remove the tongue 128 of the seat member 126 from the buckle 124, and place the child in the child seat 120.
Take it off.

When a large force is applied to a child due to a collision of an automobile or the like, and a strong tension T (FIG. 2) is applied to the tightening webbing 90 to the right through the webbings 130 and 132, the tightening webbing 90 is released. It moves slightly to the right in Fig. 2. Along with this, the cam 58 slightly rotates in the direction A of FIG. 2, and the tightening webbing 90 is sandwiched between the corrugations 74 and 84. In this case, since the teeth 76 are in contact with the tightening webbing 90, the cam 58 quickly rotates in the A direction.

When the cam 58 rotates, the wave portions 74, 8
The four are engaged with each other, and the slide plate 82 slightly moves in the B direction in FIG. And the wave portion 7 of the block 72
4 and the corrugated portion 84 of the slide plate 82 are entirely overlapped with each other, and the tightening webbing 90 is strongly sandwiched. As a result, the rightward movement of the tightening webbing 90 is reliably prevented, and the child on the child seat 120 is protected.

During this time, the tightening webbing 90 has the corrugated portion 74,
Since it is sandwiched between the 84, the fastening webbing 90 is not damaged even though the fastening webbing 90 is strongly sandwiched.

In this embodiment, as shown in FIGS.
The block 72 is located on the left side of the shaft 60 in the figure, and when the tightening webbing 90 is pulled in the T direction in FIG. 2, the block 72 rapidly moves in the direction sandwiching the webbing 90. Moreover, the webbing 90 has the long hole 9
4, the block 72 is pulled in the lower right direction in FIG. 2, so that the block 72 is pulled by the webbing 90 and rapidly rotates in the direction A in FIG. Therefore, when the vehicle collides, the tightening webbing 90 is quickly sandwiched between the cam 58 and the slide plate 82.

The web adjuster of the present invention is the seventh one.
It goes without saying that it can be used instead of the web adjuster 34 of the illustrated child seat 10.

[0044]

As described above, according to the web adjuster for a child seat of the present invention, the webbing can be held very reliably, and the child sitting on the child seat can be protected very surely. Further, even if the webbing is strongly sandwiched, it is not deteriorated at all, and the durability of the webbing is remarkably improved.

In the child seat web adjuster according to the second and third aspects, the webbing can be remarkably quickly clamped in the event of a vehicle collision.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a child seat web adjuster according to an embodiment.

FIG. 2 is a cross-sectional view of a child seat web adjuster according to an embodiment.

FIG. 3 is a cross-sectional view of a child seat web adjuster according to an embodiment.

FIG. 4 is an exploded perspective view of a child seat web adjuster according to an embodiment.

FIG. 5 is a side view of the child seat including the child seat web adjuster according to the embodiment.

FIG. 6 is a front view of a child seat including the child seat web adjuster according to the embodiment.

FIG. 7 is a perspective view of a child seat.

FIG. 8 is a cross-sectional view of a conventional web adjuster for a child seat.

[Explanation of symbols]

10,120 Child seat 18, 20, 130, 132 Webbing 30,90 Tightening webbing 50 Web adjusters 52 Side wall 54 Bottom wall 56 cases 58 cam 60 shaft 74,84 Namibe 76 teeth 82 slide plate 86 Flat part 94 openings 110 spring

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60R 22/10 A44B 11/10 A44B 11/16

Claims (3)

(57) [Claims] 1. A cam provided with a webbing contact surface having a plurality of protrusions for stopping the webbing, a case pivotally supporting the cam, and a cam of the cam provided on the case. Web adjuster for a child seat, comprising: a webbing pressing member that faces the webbing contact surface; In the above, the webbing pressing member is a slide plate movable in the moving direction of the webbing, and the corrugated surface formed of a curved surface is provided on each of the facing surfaces of the slide plate and the cam. Has teeth on the webbing adjacent to the corrugations in the biting direction of the webbing, and the facing surface of the slide plate has the teeth in the biting direction of the webbing. Child seat web adjuster, wherein the flat portion adjacent to the corrugated portion There are provided. 2. The case according to claim 1, wherein the case has a pair of side walls and a bottom wall connecting the side walls to each other, and the slide plate is slidably mounted on the bottom wall. The cam is pivotally supported by a shaft installed between the side walls, and the facing surface of the cam is opposite to the biting direction of the webbing with respect to a perpendicular line extending from the axial center of the shaft to the bottom wall. Web adjuster for child seats, which is located on the side. 3. The child seat web adjuster according to claim 2, wherein an opening for inserting a webbing is provided in the bottom wall in the biting direction with respect to the slide plate.