JP5494451B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device, and more specifically, an inflator, a seat belt that is formed in a bag shape so that gas emitted from the inflator can be fed, and a retractor is connected to one end, and a belt into which the seat belt is inserted. The present invention relates to a seat belt device including a tongue plate having an insertion hole and a roller for hooking a seat belt inserted into the belt insertion hole, and a buckle on which the tongue plate can be attached.

  Conventionally, an inflator is connected to one end of the seat belt, and when a rear-end collision occurs in the vehicle, the gas generated from the connected inflator is sent to the inside of the seat belt, and the sent belt causes the seat belt to There is known a seat belt device capable of protecting a passenger by inflating the vehicle. Here, Patent Document 1 below discloses a seat belt device in which a seat belt is inserted into a belt insertion hole of a tongue plate via a roller. As a result, the seat belt can be smoothly hung on the occupant.

JP 2001-163148 A

  However, in the above-described prior art, since the seat belt is folded back by the tongue plate, the folded portion of the seat belt is in a closed state. Therefore, a sufficient air passage through which gas flows can not be secured at the folded portion.

  An object of the present invention is to solve such a problem. An object of the present invention is to provide an air passage that allows gas to flow even at a folded portion of the seat belt by a tongue plate while the seat belt can be smoothly hung on the occupant. It is to provide a seat belt device that can be sufficiently secured.

The present invention is for achieving the above object, and is configured as follows.
The invention described in claim 1 includes an inflator, a seat belt formed in a bag shape so that gas emitted from the inflator can be fed, and a retractor connected to one end, and a belt insertion hole into which the seat belt is inserted And a tongue plate having a roller for hooking the seat belt inserted into the belt insertion hole, and a buckle on which the tongue plate can be attached, wherein the roller emits from the inflator. When the seat belt is inflated by the generated gas, a soft portion that is pressed by the swelling is formed.
According to this configuration, similarly to the seat belt device of the prior art, the seat belt is inserted into the belt insertion hole of the tongue plate via the roller, so that the passenger can smoothly hang the seat belt on the occupant. Further, according to this configuration, when the seat belt is inflated by the gas sent from the inflator, the folded portion of the seat belt is formed on the roller even if the air path is blocked. A soft part will be pressed and the air path of this folding | turning site | part can fully be ensured.

FIG. 1 is an overall perspective view of a passenger seat to which a seat belt device according to Embodiment 1 of the present invention is applied, and shows a use state of a seat belt with a tongue plate attached to a buckle. FIG. 2 is a plan view of the tongue plate of FIG. 1, showing a roller and a seat belt in cross section. FIG. 3 is a view showing a state when the seat belt hung on the tongue plate of FIG. 2 is inflated. FIG. 4 is a plan view of the tongue plate according to the second embodiment of the present invention, in which a roller and a seat belt are shown in cross section. FIG. 5 is a plan view of a tongue plate according to a third embodiment of the present invention, in which a roller and a seat belt are shown in cross section. FIG. 6 is a plan view of a tongue plate according to a fourth embodiment of the present invention, showing a roller and a seat belt in cross section. FIG. 7 is a plan view of a tongue plate according to a fifth embodiment of the present invention, showing a roller and a seat belt in cross section.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Example 1
First, Example 1 of the present invention will be described. First, the passenger seat 1 according to the first embodiment will be described. The passenger seat 1 includes a seat cushion 2, a seat back 3, and a seat belt device 4 (see FIG. 1). Of these components 2, 3, and 4, the seat belt device 4 will be described. Since the seat cushion 2 and the seat back 3 may have a known configuration, detailed description thereof will be omitted.

  The seat belt device 4 mainly includes an inflator 10, a seat belt 20, a tongue plate 30, and a buckle 40. Below, these structural members 10, 20, 30, and 40 are demonstrated separately.

  First, the inflator 10 will be described. The inflator 10 is a member that emits high-pressure gas, and is attached to the outer side of a cushion frame (not shown) of the seat cushion 2. The inflator 10 is configured to emit high-pressure gas when an ECU (not shown) detects that a rear-end collision has occurred in the vehicle.

  Next, the seat belt 20 will be described. The seat belt 20 is a belt member that restrains the passenger in the passenger seat 1. One end side of the seat belt 20 is fastened to an outer side of a cushion frame (not shown) of the seat cushion 2 via an anchor 50. On the other hand, the other end of the seat belt 20 is fastened to a retractor (not shown) attached inside the seat back 3.

  The seat belt 20 is formed in a substantially cylindrical shape having an air passage 26 through which gas can be sent from one end side to the other end side. Further, the inside (air passage 26) on one end side of the seat belt 20 and the inflator 10 are connected via a hose 12. Thereby, the gas emitted from the inflator 10 can be sent to the inside of the seat belt 20. In addition, the seat belt 20 is in a state of being folded so that both surfaces (the front surface and the back surface) form a substantially band shape during normal times (always before the inflator is activated).

  Next, the tongue plate 30 will be described with reference to FIG. The tongue plate 30 is a plate member that can be attached to a buckle 40 described later. The tongue plate 30 is formed in a substantially C shape so as to have a belt insertion hole 32 into which the seat belt 20 can be inserted. Further, rollers 34 made of a hard material are pivotally attached to both ends of the C-shape of the tongue plate 30.

  Here, the roller 34 will be described in detail. The outer peripheral surface of the roller 34 is formed so that the diameter of the cross section becomes smaller from the both ends in the longitudinal direction toward the center. As a result, when the seat belt 20 is hung on the roller 34, the hung seat belt 20 can be prevented from shifting in the width direction.

  A soft portion 36 made of a soft material is formed on the outer peripheral surface of the roller 34. The soft portion 36 is integrally formed with the roller 34 (for example, two-color molding). The roller 34 is configured in this way. The tongue plate 30 is hooked on the seat belt 20 with the seat belt 20 inserted into the belt insertion hole 32 being hooked on the roller 34.

  Finally, the buckle 40 will be described. The buckle 40 is a receiving member to which the tongue plate 30 can be attached, and is attached to the inner side of a cushion frame (not shown) of the seat cushion 2. When the seat belt 20 is fastened to the passenger in the passenger seat 1 and the tongue plate 30 is attached to the buckle 40, the passenger can be restrained by the seat belt 20. The state in which the occupant is restrained in this way is referred to as a use state of the seat belt 20 (see FIG. 1).

  The seat belt device 4 includes the inflator 10, the seat belt 20, the tongue plate 30, and the buckle 40. The passenger seat 1 includes a known seat cushion 2, a known seat back 3, and the above-described seat belt device 4.

  Then, with reference to FIGS. 2-3, the effect | action of the seatbelt apparatus 4 mentioned above is demonstrated. In this description, the operation of the seat belt 20 when in use will be described. When an ECU (not shown) detects that a rear-end collision has occurred in the vehicle, gas is emitted from the inflator 10. The emitted gas is sent to the inside of one end side of the seat belt 20 (lap belt 20a) through the hose 12.

  The lap belt 20 a means the seat belt 20 between the tongue plate 30 and the anchor 50 in the seat belt 20. On the other hand, in the seat belt 20, a portion between the tongue plate 30 and the shoulder opening of the seat back 3 is referred to as a shoulder belt 20b.

  Then, since gas is sent to the air passage (inside) 26 of the seat belt 20 (lap belt 20a), the seat belt 20 to which this gas has been sent from the one end side (lap belt 20a side) to the seat back 3 side ( It swells in order toward the shoulder belt 20b side). Since the seat belt 20 is folded by the tongue plate 30, the folded portion of the seat belt 20 is in a state where the air passage 26 is closed (see FIG. 2).

  However, the folded portion swells while pressing the soft portion 36 of the roller 34. Therefore, as described above, even if the air passage 26 of the folded portion is in a closed state (even in the state of FIG. 2), the soft portion 36 is pressed, and this The air path 26 at the folded portion can be sufficiently secured (see FIG. 3).

  Since the gas generated from the inflator 10 is high pressure, the seat belt 20 (the lap belt 20a and the shoulder belt 20b) swells instantaneously. When the seat belt 20 itself inflates in this way, the initial restraint of the occupant when a rear-end collision occurs in the vehicle, compared to a normal seat belt 20 that simply restrains the occupant (a seat belt in which the belt itself does not swell). Performance can be improved.

  Further, when the seat belt 20 itself inflates in this way, even if a load is applied from the occupant to the seat belt 20 after a rear-end collision has occurred, the surface pressure of the applied load is reduced. The impact on the passenger due to the reaction force can also be reduced. In this way, the passenger can be protected.

  The seat belt device 4 according to the first embodiment of the present invention is configured as described above. According to this configuration, the seat belt 20 is inserted into the belt insertion hole 32 of the tongue plate 30 via the roller 34 as in the conventional seat belt device, so that the passenger can smoothly hang the seat belt 20 on the occupant. Can be fastened. Further, according to this configuration, the soft portion 36 is formed on the outer peripheral surface of the roller 34. For this reason, when the seat belt 20 is inflated by the gas sent from the inflator 10, the folded portion of the seat belt 20 is a soft material formed on the roller 34 even if the air passage 26 is closed. The part 36 will be pressed, and the air path 26 of this folding | returning site | part can fully be ensured.

(Example 2)
Next, Example 2 will be described. The seat belt device 4 according to the second embodiment has a configuration in which the ratio of the soft portion 36 to the outer peripheral surface of the roller 34 is increased as compared with the seat belt device 4 according to the first embodiment described above. In the following description, members having the same or equivalent configuration as in the first embodiment are denoted by the same reference numerals in the drawings, and redundant description is omitted. This is the same in all embodiments described later.

  As shown in FIG. 4, the soft portion 36 is formed on the outer peripheral surface of the roller 34 up to positions near both end surfaces of the roller 34.

  The seat belt device 4 according to the second embodiment of the present invention is configured as described above. According to this configuration, it is possible to obtain the same effects as those of the seat belt device 4 of the first embodiment. Further, according to this configuration, the soft portion 36 is formed on the outer peripheral surface of the roller 34 up to a position near both end surfaces of the roller 34, so that the soft portion 36 is compared with the seat belt device 4 of the first embodiment. Therefore, the seat belt 20 can be inflated greatly. Therefore, the air path 26 at the folded portion of the seat belt 20 by the tongue plate 30 can be more sufficiently secured.

(Example 3)
Next, Example 3 will be described. The seat belt device 4 of the third embodiment has a form in which the ratio of the soft portion 36 to the outer peripheral surface of the roller 34 is increased as compared with the seat belt device 4 of the second embodiment already described.

  As shown in FIG. 5, the soft portion 36 is formed on the outer peripheral surface of the roller 34 up to positions near both end surfaces of the roller 34.

  The seat belt device 4 according to the second embodiment of the present invention is configured as described above. According to this configuration, it is possible to obtain the same effects as the seat belt device 4 of the second embodiment. Further, according to this configuration, since the soft portion 36 is formed up to both end positions of the roller 34 on the outer peripheral surface of the roller 34, compared with the seat belt device 4 of the second embodiment, the pressed portion of the soft portion 36. Therefore, the seat belt 20 can be greatly inflated. Therefore, the air path 26 at the folded portion of the seat belt 20 by the tongue plate 30 can be more sufficiently secured.

(Example 4)
Next, Example 4 will be described. The seat belt device 4 according to the fourth embodiment is configured such that the roller 136 itself is pressed as compared with the seat belt device 4 according to the first embodiment described above.

  As shown in FIG. 6, the roller 136 is made of a soft material similar to the soft portion 36 described in the first embodiment. As a result, the roller 136 itself can perform the same function as the soft portion 36 described in the first embodiment. Further, the roller 136 is formed with a hollow portion 136a so as to form along the longitudinal direction. Thereby, the effect of the roller 136 described above (the effect that the roller 136 itself performs the same function as the soft portion 36 described in the first embodiment) can be enhanced.

  The seat belt device 4 according to the fourth embodiment of the present invention is configured as described above. According to this configuration, it is possible to obtain the same effects as those of the seat belt device 4 of the first embodiment. That is, even if the air path 26 at the folded-back portion of the seat belt 20 by the tongue plate 30 is blocked, the roller 136 itself is pressed, and the air path 26 at the folded-back portion is sufficiently It can be secured.

(Example 5)
Finally, Example 5 will be described. In the seat belt device 4 of the fifth embodiment, the soft portion 236 serves as the roller 34 as compared with the seat belt device 4 of the first embodiment already described.

  As shown in FIG. 7, the roller 234 is fixed to the tongue plate 30. The roller 234 is made of a material harder than the soft portion 36 described in the first embodiment. A soft portion 236 made of a soft material is formed on the outer peripheral surface of the roller 234. The soft portion 236 is formed to be rotatable with respect to the outer peripheral surface around the axis of the roller 234.

  The seat belt device 4 according to the fifth embodiment of the present invention is configured as described above. According to this configuration, it is possible to obtain the same effects as those of the seat belt device 4 of the first embodiment. In other words, even if the air passage 26 at the folded-back portion of the seat belt 20 by the tongue plate 30 is closed, the soft portion 236 is pressed, and the air passage 26 at the folded-back portion is sufficiently secured. it can.

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In each embodiment, the passenger seat 1 has been described as an example. However, the present invention is not limited to this, and it may be a driver's seat, a rear seat, or the like.

  In each embodiment, the example in which the seat belt 20 itself (the lap belt 20a and the shoulder belt 20b) is inflated has been described. However, the present invention is not limited to this, and an airbag bag may be provided on the lap belt 20a and the shoulder belt 20b, and the provided airbag bag may be inflated. In that case, a larger amount of expansion can be ensured than the expansion of the seat belt 20 itself.

4 seat belt device 10 inflator 20 seat belt 30 tongue plate 32 belt insertion hole 34 roller 36 soft part 40 buckle

Claims (1)

An inflator,
A seat belt formed in a bag shape capable of sending gas emitted from the inflator and connected to a retractor at one end;
A tongue plate having a belt insertion hole into which the seat belt is inserted, and a roller for hanging the seat belt inserted into the belt insertion hole;
A seat belt device including a buckle to which the tongue plate can be attached,
A seatbelt device characterized in that a soft part that is pressed by the swelling of the seatbelt when the seatbelt is swollen by gas emitted from the inflator is formed on the roller.

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