JP5553017B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device, and more specifically, an inflator, a seat belt formed in a bag shape so that gas emitted from the inflator can be fed, a tongue plate into which the seat belt is inserted, and the tongue The present invention relates to a seat belt device provided with a buckle to which a 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 tube is provided inside a seat belt and gas is sent from the lap belt side to the shoulder belt side through the tube. Thereby, even if the seat belt is folded back by the tongue plate, gas can be smoothly fed from the lap belt side to the shoulder belt side.

JP-T-2002-502750

  However, in the above-described prior art, since the tube is provided inside the seat belt, the thickness of the seat belt is increased, and there is a problem that the usability of the seat belt is deteriorated.

  SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and its purpose is to provide a seat belt capable of smoothly feeding gas from the lap belt side to the shoulder belt side and preventing deterioration of the usability of the seat belt. Is to provide a device.

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, a tongue plate into which the seat belt is inserted, and the tongue plate. A seat belt device including a possible buckle, and in a state before the gas is emitted from the inflator, the bag-shaped interior of the seat belt has a first interior and a pair of second interiors along the longitudinal direction thereof. The gas emitted from the inflator is sent to the second interior, and the first interior and the second interior compartment are formed by stitching the first thread, and the sheet The belt itself is substantially folded before the inflator is actuated in a state where the first interior is folded so as to sandwich the pair of second interiors vertically. Both edges are stitched together by a second thread so as to form a shape, and the first thread is such that the stitched end of the first thread is on the anchor side of the stitched end of the second thread on the retractor side of the seat belt. It is the structure characterized by being sewn to .
According to this configuration, when the gas is introduced from the inflator, the second interior expands. And if the 2nd inside is inflated, the 1st inside can also be inflated with this swelling. Therefore, gas can be smoothly sent from the lap belt side to the shoulder belt side, as in the prior art. Further, according to this configuration, unlike the prior art, it is not necessary to provide a tube inside the seat belt. Therefore, the thickness of the seat belt is not increased, and deterioration of the usability of the seat belt can be prevented.

The invention according to claim 2 is the seat belt device according to claim 1, wherein when the gas sent only to the second interior becomes high pressure in the second interior, the first interior and the first interior The gas emitted from the inflator is also sent to the first interior by bursting the internal compartment of 2.
Therefore, the seat belt can be inflated.

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. 2 is a cross-sectional view of the seat belt of FIG. FIG. 3 is a view showing a state in the middle of swelling of the seat belt of FIG. FIG. 4 is a view showing a state where the swell of the seat belt in FIG. 3 is completed. FIG. 5 is a cross-sectional view of a seat belt according to Embodiment 2 of the present invention.

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 front 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. Here, the air passage 26 will be described in detail. The air passage 26 is always connected to the main air passage 22 along its longitudinal direction before the inflator 10 is operated (hereinafter, simply referred to as “normal time”). The first yarns N1 and N1 are sewn so as to form a pair of sub air passages 24 and 24. The main air passage 22 and the sub air passage 24 correspond to “first interior and second interior” recited in the claims.

  And the one end side of both sub wind paths 24 and 24 of this seatbelt 20 and the inflator 10 are connected via the hoses 12 and 12. FIG. Thereby, the gas emitted from the inflator 10 can be sent to both the sub air passages 24, 24 of the seat belt 20. The seat belt 20 normally has a belt-like shape in a state in which the main air passage 22 is folded so as to sandwich the pair of sub air passages 24 and 24 in the vertical direction. Both edges are sewn together by the second threads N2 and N2 (see FIG. 2). Note that the main air passage 22 is shaped to branch up and down (branch into four) in each of the sub air passages 24 and 24 by stitching these two threads N1 and N2.

  Note that, on the other end side of the seat belt 20, the first threads N1 and N1 are sewn so that the stitched ends are closer to the front side than the stitched ends of the second threads N2 and N2 (one in FIG. 1). (See enlarged view). Thus, as will be described later, when the gas is emitted from the inflator 10 and the sub air passages 24, 24 and the main air passage 22 are in communication from one end side to the other end side of the seat belt 20, the main wind In the path 22, gas can be sent also from the other end side toward the one end side, so that the time difference until the bulging is completed between the lap belt 20a and the shoulder belt 20b can be reduced.

  Next, the tongue plate 30 will be described. 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 O shape so as to have a belt insertion hole 32 into which the seat belt 20 can be inserted. The tongue plate 30 is hooked on the seat belt 20 in a state where the seat belt 20 is inserted into the belt insertion hole 32.

  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 hung on the passenger seated on 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. 2-4, 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 one end side of both sub air passages 24, 24 of the seat belt 20 (lap belt 20a) via the hoses 12, 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 the gas is sent to both the sub air passages 24, 24 of the seat belt 20 (lap belt 20a), the both sub air passages 24, 24 of the seat belt 20 to which the gas is sent are at one end side (the lap belt). 20a side) in turn toward the seat back 3 side (shoulder belt 20b side). At this time, even if both the sub air passages 24 and 24 are inflated, the main air passage 22 can be inflated along with the inflating (see FIG. 3).

  Eventually, when both the sub-air passages 24, 24 are completely inflated (when the gas becomes high pressure in both sub-air passages 24, 24), the first air flow from the one end side of the seat belt 20 toward the other end side becomes the first. Since the yarns N1, N1 and the second yarns N2, N2 are cut, the sub air passages 24, 24 and the main air passage 22 are in communication with each other from one end side to the other end side of the seat belt 20. . In this way, since the gas sent from the inflator 10 is also sent to the main air passage 22, the seat belt 20 can be inflated (see FIG. 4). In this way, as described above, since the gas can be sent from the other end side to the one end side in the main air passage 22 as already described, the gap between the lap belt 20a and the shoulder belt 20b. The time difference until these bulges are completed can be reduced. And the passenger | crew can be protected by the swelled seat belt 20 similarly to the prior art.

  As described above, the main air passage 22 also swells as the sub air passages 24 and 24 swell, so that, for example, when the seat belt 20 is in a normal use state, Even if the main air passage 22 of the seatbelt 20 is closed due to folding (even if it is in the state of FIG. 2), when gas is emitted from the inflator 10, the main air passage of this folding portion 22 can be secured (see FIG. 3). Therefore, gas can be smoothly sent from the lap belt 20a side to the shoulder belt 20b side.

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

  Further, if the seat belt 20 can be inflated in this way, even if a load is applied from the occupant to the seat belt 20 after the 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 occupant can be further protected as compared with a normal seat belt that simply restrains the occupant.

  The seat belt device 4 according to the first embodiment of the present invention is configured as described above. According to this configuration, when the gas is introduced from the inflator 10, both the sub air passages 24 and 24 are expanded. When both the sub air passages 24 and 24 are inflated, the main air passage 22 can be inflated along with the inflating. Therefore, similarly to the prior art, gas can be smoothly fed from the lap belt 20a side to the shoulder belt 20b side. Further, according to this configuration, unlike the prior art, it is not necessary to provide a tube inside the seat belt 20 (the air passage 26). Therefore, the thickness of the seat belt 20 is not increased, and deterioration of the usability of the seat belt 20 can be prevented.

  Further, according to this configuration, when both the sub air passages 24 and 24 are completely inflated (when the gas becomes high pressure inside the both sub air passages 24 and 24), the other end side from the one end side of the seat belt 20 is achieved. Since the first yarns N1 and N1 and the second yarns N2 and N2 are cut toward the other side, both the sub air passages 24 and 24 and the main air passage 22 are directed from one end side to the other end side of the seat belt 20. Will be in communication. Therefore, the gas sent from the inflator 10 can also be sent to the main air path 22. Therefore, the seat belt 20 can be inflated.

  Further, according to this configuration, the air passage 26 is partitioned by sewing the first threads N1 and N1 so as to form the main air passage 22 and the pair of sub air passages 24 and 24 along the longitudinal direction thereof. Yes. Therefore, since the air passage 26 of the seat belt 20 is partitioned by sewing as described above, the seat belt 20 can be easily manufactured.

(Example 2)
Next, Example 2 will be described. The seat belt device 4 of the second embodiment is a form in which the number of branches of the main air passage 22 is changed as compared with the seat belt device 4 of the first embodiment already described. 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.

  As shown in FIG. 5, the main air passage 22 is shaped to branch (branch into two) under each of the sub air passages 24 and 24 by stitching the two threads N1 and N2.

  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 seat belt 20 can be made more compact than in the first embodiment.

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.

  Moreover, in each Example, the gas emitted from the inflator 10 demonstrated the example sent to the one end side of both the sub air paths 24 and 24 of the seatbelt 20 (lap belt 20a) via the hoses 12 and 12. FIG. However, the present invention is not limited to this, and may be sent to one end side of the main air passage 22 of the seat belt 20 (lap belt 20a) via the hoses 12 and 12. In that case, the cushioning property of the seat belt 20 as a whole can be improved from the initial state where the gas is emitted.

4 Seat belt device 10 Inflator 20 Seat belt 22 Main air passage (first interior)
24 Sub air passage (second interior)
30 tongue plate 40 buckle N1 first sewing

Claims (2)

An inflator,
A seat belt formed into a bag shape so that gas emitted from the inflator can be fed; and
A tongue plate in which this seat belt is inserted,
A seat belt device including a buckle to which the tongue plate can be attached,
In the state before the gas is emitted from the inflator, the bag-shaped interior of the seat belt is partitioned into a first interior and a pair of second interiors along the longitudinal direction,
The gas emitted from the inflator is sent to the second interior ,
The first interior and the second interior compartment are made by stitching the first thread,
The seat belt is always folded before the inflator is actuated so that the first interior is folded so as to sandwich the pair of second interiors in the vertical direction, so that the seat belt itself has a substantially belt-like shape. Both edges are stitched together by the second thread,
The seat belt device, wherein the first thread is sewn on the retractor side of the seat belt so that the stitched end is closer to the anchor side than the stitched end of the second thread . The seat belt device according to claim 1,
When the gas sent only to the second interior becomes a high pressure in the second interior, the first interior and the second interior section burst, so that the gas emitted from the inflator also enters the first interior. A seat belt device that is fed.

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