JPS6028699B2 - Restraint belt guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a restraint belt guide in which an occupant restraint belt is folded back, and particularly to a restraint belt guide designed to allow smooth sliding of the restraint belt in the folded portion.

The one shown in FIG. 1 is widely used as an occupant restraint device for restraining an occupant to a seat in the event of a vehicle emergency to ensure their safety.

In this occupant restraint system, a restraint belt 14 whose one end is fixed to the lower part of the side wall 12 of the vehicle 10 is wrapped around a through tongue 16 and folded back, and then folded back again at the restraint belt guide 18 at the upper part of the side wall 12, and then the restraint belt 14 is attached to the center of the side wall 12. It is wound up from the other end by a winding device 20 which is fixedly attached to the winding device 20 .

Here, the passenger 22 takes a seat on the seat 24 and then presses the tongue 16.
By engaging the buckle 26 attached to the approximate center of the vehicle 10, a three-point restraint state can be achieved. As shown in FIG. 2, this restraining band guide 18 is made of a round bar having an annular shape, and the restraining band 14 is wrapped around a ring portion 28 and then folded back.

In such an occupant restraint device, after the occupant 22 exits the vehicle, the remaining restraint belt 14 is reliably wound onto the winding device 20, so that the restraint belt 14 is not scattered.
It is desirable that the winding force is strong.

However, considering that the winding force is constantly applied to the passenger 22 while the passenger 22 is riding the vehicle, giving a feeling of pressure, the winding device 2
It is desirable that the winding force at 0 is as low as possible. Under these circumstances, the winding force of the winding device 20 is made as low as possible to ensure that the remaining restraint belt 14 is removed when not in use.
Measures are being sought to reduce the sliding friction of the restraint belt in the restraint belt guide 18 in order to wind it up.

For this reason, surface treatments such as painting and plating have been applied to the ring portion 28, but the expected effects have not been obtained.

Furthermore, due to the interior design of the vehicle, the entry side restraint belt 14A in the ring portion 28 and the exit side restraint belt 14B after being folded back are usually
Since each longitudinal center line is folded back at the ring part 28 at a predetermined angle (angle Q in FIG. 2), the restraint belt 14 is biased to one side of the ring part 28 as the restraint belt slides at this folded part. This also causes the restraint belt 14 to break when a large tension is applied during a vehicle collision.

In addition, in this type of occupant restraint system, the retractor 20 instantly stops unwinding the restraint belt 14 in the event of a vehicle emergency such as a collision, thereby preventing the occupant 22 from jumping out. Because the length of the restraint belt is long until it slides into contact with the passenger, the restraint belt stretches greatly due to the inertia of the occupant 22 after the winding device 20 stops unwinding, and furthermore, the winding tightening of the winding device 20 is added to the A considerable amount of was thrown out, and an appropriate restraint effect was not obtained.

The present invention has been made in view of the above circumstances, and its purpose is to provide a restraint belt guide in which the restraint belt can be smoothly folded back at the wrapping portion, and which can reliably restrain the restraint belt in the event of a vehicle emergency. It is.

The restraint belt guide according to the present invention has a roller around which the restraint belt is wrapped and folded back, and a shaft portion having a diameter smaller than the diameter of the wrapped portion of the roller, and the roller is rotatably supported by the wand. The holding plate is also provided with a closing opening through which one of the entry side and exit side restraint bands folded back by the roller is inserted, and a holding plate in which a restraining part of the restraining band is formed in the opening of the closing opening □green.

According to the above configuration, under normal usage conditions, the restraining band rotates while receiving the rotational frictional force of the rollers, but this frictional force is smaller than the sliding friction, so the folded part of the restraining band can slide smoothly. It is done.

On the other hand, if a large force is applied to the restraint belt in a vehicle emergency situation and the rollers detach from the retaining plate, the restraint belt will be instantly caught by the edge of the gate, and at the same time the restraining part will act as a resistance against the movement of the restraint belt. The passenger is securely restrained by suppressing the elongation of the vehicle. Embodiments of the present invention will be described below with reference to the drawings.

3 and 4 show an embodiment of the present invention, which is comprised of a restraining band guide, a retaining plate 32, and a roller 34. The holding plate 32 is made of thin-walled steel, and has a mounting hole 36 punched out on one side and a rectangular opening 38 into which a restraining band is inserted on the other side.

This closing opening 38 is formed so that its longitudinal direction is substantially horizontal when attached to the vehicle body, and support legs 40 are provided upright from both ends in the longitudinal direction.

In addition, at one end in the width direction of the closing opening 38, that is, at the upper green part of the closing opening 38 when attached to the vehicle body, a regulating protrusion whose central portion is slightly protruded toward the center of the opening so as to reduce the opening area of the closing opening 38 is provided. It is said to be 42. On the other hand, at the other widthwise end (lower green) of the opening □, two claws 62 and 63 protrude toward the center of the closed opening as a deterrent portion. Note that it is desirable that the tip of the claw be formed at an acute angle. The strength of each part of the holding plate is determined so that when a restraining band is wrapped around the lower edge of the opening 38 and folded back (see Fig. 5), the holding plate will not break even if a tensile force of about 2Pn is applied to the restraining band. It is being

On the other hand, disks 46 having a diameter slightly larger than the outer diameter R of the roller 34 are fixed to both ends of the roller 34 in the longitudinal direction. Further, a shaft 48 having a diameter r passes through the roller 34 , and both ends of the shaft 48 are pivotally supported by the support legs 40 , so that the roller 34 is rotatably supported by the holding plate 32 . .

The shear failure load of this shaft 48 is approximately 200 kg. Here, a regulating gap is formed between the outer circumferential surface of the roller 34 and the regulating protrusion 42 protruding from the upper edge of the opening 38, which is greater than or equal to the thickness of the constraining band and less than twice the thickness.

The holding plate 32 is rotatably supported by the side wall 12 of the vehicle via the mounting hole 36.

Next, the operation of the above embodiment will be explained. In a normal usage mode of the restraint belt, when the restraint belt 14 is pulled toward the entrance restraint belt 14A or the exit restraint belt 14B, the roller 34 is rotated by the frictional force between the restraint belt and the roller. Since the diameter r of the shaft 48 is small with respect to the outer law R of 34, the roller 34 does not exert a large resistance, and the restraining band 14 is smoothly folded back at the wrapping portion.

Furthermore, when the entry side restraint belt 14A and the exit side restraint belt 14B are wound around the roller 34 at an angle Q, the exit side restraint belt 14
When the restraining band is pulled in the direction B, the folded portion of the restraining band is gradually moved to the right in FIG. 3 as the roller 34 rotates. However, in this case, the ear portions 15 of the restraining band rest against the side surfaces of the disc 46, so that they do not ride on the competitive surface of the disc 46, and do not get caught between it and the closing opening. In this case, disk 4
By making the gap between the outer circumferential surface of 6 and the closing opening 38 greater than or equal to the thickness of the restraining band and less than twice the thickness, the above effect becomes more reliable. Furthermore, since the regulation gap formed by the roller 34 and the regulation protrusion 42 is greater than or equal to the thickness of the restraint band and less than twice the thickness, the restraint belt does not overlap twice at the wrapping portion, as in the conventional case. It is possible to avoid an accident in which the restraint belt is biased to one side in the width direction and a concentrated load is applied, leading to breakage.

When a large tension is applied to the restraint belt in a vehicle emergency situation, the roller 34 receives this tension, and the shaft 48 breaks and falls off from the holding plate 32.

However, as shown in FIG.
has a sufficiently large strength, so the restraining band 14 is reliably supported. At this time, the claws 62 and 63 serving as the restraining portions of the restraint belt 14 bite into the restraint belt, and the restraint belt receives great resistance from the claws and is locked to the holding plate 32. Therefore, since no large tensile force is applied to the restraining band between the claw and the winding device (see FIG. 1), the amount of overall elongation of the restraining band is suppressed, and no dangerous situation is caused to the occupant. Furthermore, the fifth
As shown in the figure, when the claws 62 and 63 penetrate the restraint belt 14 in the thickness direction, the tension of the restraint belt causes the restraint belt to
4 moves toward the exit side restraint band 14B while being torn, which is effective in absorbing collision energy.

In the above description, it is of course possible to form the shaft 48 integrally with the roller 34, and any design change is possible as long as the roller 34 is supported on the holding plate 32 with a diameter smaller than its outer diameter. is also possible.

Further, the regulation gap can also be formed simply by increasing the diameter of the roller 34 without providing the protective protrusion 42.

Furthermore, the restraint part is not limited to the two claws 62 and 63, but may have any structure that can restrain the movement of the restraint belt in a vehicle emergency; for example, it may be a sawtooth-shaped convex part. It's okay.

Although the above embodiment describes the restraint belt guide for folding back the restraint belt from the take-up device to the through tongue, the present invention is not limited to this, and the present invention is not limited to this. It is applicable regardless of whether or not the object is actually in contact with the object.

As described above, according to the present invention, since the restraining band is folded back by the rollers without any force, smooth sliding is ensured, and the friction at this portion is reduced, so that the winding force of the winding device is reduced. can do.

In addition, in the event of a vehicle emergency, the restraint belt is directly supported by the opening of the holding plate, and at the same time its movement is stopped by the restraint part, which reduces the total amount of restraint extension, securely restrains the occupant, and prevents dangerous situations. can be avoided.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing a general restraint device, Fig. 2 is a front view showing the same restraint belt guide, Fig. 3 is a front view showing an embodiment of the present invention, and Fig. 4 is Fig. 3 W- A sectional view corresponding to the N-line cross section, and FIG. 5 is an operational diagram of FIG. 4. 14... Restraint band, 60... Restraint band guide, 32... Holding plate, 34... Roller, 38... Closing, 42... ...・Parental control piece, 4
8...Shaft, 62, 63...Claw portion (restraint portion). Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A roller around which a restraining band is wrapped and folded back, and a shaft portion having a diameter smaller than the diameter of the winding portion of the roller, the shaft portion rotatably supports the roller, and an entry side is folded back by the roller. or a holding plate provided with an opening through which one of the exit-side restraining bands is inserted, and a restraining band restraining portion is formed on the opening edge of the opening, and when the roller is detached from the holding plate, the restraining band is removed. a restraining band guide configured to support the opening edge of the opening and at the same time provide resistance by the restraining portion.