Occupant protection devices

Abstract

To provide an occupant protection device which prevents an airbag provided on a lap belt part from being less prone to expand due to an interference object, despite that the interference object appears at a front side of a seat.SOLUTION: An occupant protection device 10 comprises an airbag 30 provided on a lap belt part 13 constraining the waist MW of an occupant M. A bag body part 30a of the airbag 30 expands when inflating gas is fed, to receive the occupant M, and includes: a rear wall part 30a1 abutting on the occupant M; a front wall part 30a2 which is arranged at an interval from the rear wall part 30a1 ahead of the rear wall part 30a1, and which is connected to the other end of a tether 30c whose one end is connected to the rear wall part 30a1; and an upper wall part 30a3 connecting the rear wall part 30a1 and the front wall part 30a2, above the tether 30c. When the tether 30c is caught and locked by a handle 80 being a support, the bag body part of the airbag is supported by the handle 80 via the tether 30c.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to an occupant protection device for protecting an occupant seated in a vehicle seat. [Background technology]

[0002] A steering wheel airbag has been widely used to protect a driver seated in a vehicle. Patent Document 1 describes a seatbelt airbag that is attached to a lap belt that restrains the occupant's waist to protect the occupant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-66425 Summary of the Invention [Problem to be solved by the invention]

[0004] Because a driver's seat is generally configured to be movable in the fore-and-aft direction, the distance between the occupant sitting in the driver's seat and the steering wheel changes depending on the position of the driver's seat. Here, when the distance between the occupant sitting in the driver's seat and the steering wheel is large, protecting the occupant with an airbag provided in the lap belt portion, as in the configuration described in Patent Document 1, may be more effective than protecting the occupant with an airbag provided in the steering wheel. This configuration is particularly effective when, with the advent of autonomous driving in vehicles, a configuration is adopted that allows the driver's seat to be moved farther rearward than before in order to ensure a larger space in front of the occupant sitting in the driver's seat.

[0005] On the other hand, the airbag described in Patent Document 1 is shaped so that it expands without any gaps in front of the occupant when fully inflated. Therefore, if the airbag inflates when the distance between the driver's seat and the steering wheel is short, the airbag may interfere with the steering wheel and become difficult to expand.

[0006] Therefore, the present invention aims to provide an occupant protection device that can prevent an airbag attached to a lap belt portion from being difficult to deploy even when an obstruction is present in front of the seat. [Means for solving the problem]

[0007] A representative configuration of the present invention for solving the above-mentioned problems is an occupant protection device for protecting an occupant seated in a vehicle seat, the occupant protection device comprising: a seat belt having at least a tongue, a buckle to which the tongue is connected, and a lap belt portion that restrains the waist of the occupant seated in the seat when the tongue is connected to the buckle; an inflator that generates inflation gas; an airbag provided in the lap belt portion, which is inflated by being supplied with the inflation gas and receives the occupant; an airbag having a conduit portion that guides inflation gas to the main body portion and causes the inflation gas to flow into the main body portion, and a tether connected to the outer peripheral surface of the main body portion, wherein when inflation is complete, the main body portion has a rear wall portion that abuts the occupant, a front wall portion that is positioned in front of the rear wall portion and spaced apart from the rear wall portion, and has one end of the tether connected to the rear wall portion and the other end connected to the rear wall portion, and an upper wall portion that connects the rear wall portion and the front wall portion above the tether, and wherein the tether is hooked onto and engaged with a support body, thereby supporting the main body portion on the support body via the tether.

[0008] According to the present invention, in an occupant protection device, even if there is an obstruction in front of the seat, it is possible to prevent the obstruction from making it difficult for the airbag provided in the lap belt portion to expand. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a seat equipped with an occupant protection device according to an embodiment of the present invention; [Figure 2]FIG. [Figure 3] FIG. [Figure 4] FIG. 10 is a left side view of the seat when the airbag is inflated. [Figure 5] 4 is a cross-sectional view of the bag assembly taken along the line AA shown in FIG. 3. FIG. [Figure 6] FIG. 2 is a perspective view of the bag assembly in an inflated state, as viewed from below. [Figure 7] FIG. [Figure 8] FIG. 10 is a view of the seat and its surroundings when the airbag is inflated, seen from the left side. [Figure 9] FIG. 10 is a view of the seat and its surroundings when the airbag is inflated, seen from the left side. [Figure 10] 1 is a view of the periphery of a seat when an airbag is inflated, as viewed from the left side, in a configuration in which an occupant protection device is mounted on a passenger seat. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, the overall configuration of an occupant protection device 10 according to one embodiment of the present invention will be described with reference to the drawings. Note that the dimensions, materials, shapes, relative positions, and the like of the components described below are not intended to limit the scope of the present invention unless otherwise specified. In addition, in the following description, the left-right direction means the left and right directions of the seat 1 equipped with the occupant protection device 10, specifically the left and right directions as seen from the perspective of an occupant M seated in the seat 1. The front-rear direction means the front and rear directions of the seat 1, specifically the front and rear directions as seen from the perspective of an occupant M seated in the seat 1. The up-down direction means the up and down directions in the vertical direction.

[0011] Fig. 1 is a perspective view of a seat 1 equipped with an occupant protection device 10. Fig. 2 is a left side view of the seat 1. Fig. 3 is a front view of the seat 1, showing an occupant M seated in the seat 1 and fastening a seat belt 11, and the inflated airbag 30 of the occupant protection device 10, by a two-dot chain line. Fig. 4 is a left side view of the seat 1 when the airbag 30 has inflated, showing an occupant M seated in the seat 1 and fastening a seat belt 11, by a two-dot chain line.

[0012] As shown in FIGS. 1 to 4 , an occupant protection device 10 is mounted on a seat 1, which is a driver's seat of a vehicle, to protect an occupant M seated in the seat 1. The occupant protection device 10 comprises a seat belt 11, a bag assembly 29 including an airbag 30, and an inflator 24 that supplies inflation gas to the airbag 30. The seat 1 comprises a backrest 2 and a seat portion 5. The seat 1 is configured to be slidable in the front-rear direction by a seat slide (not shown). The seat slide comprises two rails, one on the left and one on the right, attached to the vehicle body below the seat 1, and a rail that engages with the two rails attached to the seat frame 4, with a locking mechanism provided between them. Note that although the vehicle of this embodiment is not equipped with an autonomous driving mode, the seat 1 is configured to be movable rearward by a large amount by the seat slide (not shown) so as to be compatible with vehicles equipped with an autonomous driving mode, thereby ensuring ample legroom for the occupant M.

[0013] The seat belt 11 is made of a belt-like material woven from polyester fiber or the like, which has good sliding properties. The seat belt 11 is configured so that its upper end 11a can be reeled out from a retraction mechanism 15 provided inside the backrest 2 near the upper left edge, near the left shoulder of an occupant M seated in the seat 1. The lower end 11b of the seat belt 11 is a fixed end fixed to an anchor member 17 provided on the left side of the seat portion 5. A tongue 20 is provided in the middle of the seat belt 11. The tongue 20 is fastened to a buckle 19 provided on the right side of the seat portion 5 of the seat 1. When the occupant M is seated in the seat 1 and the tongue 20 is fastened to the buckle 19, the seat belt 11 is fastened to the occupant M.

[0014] The seat belt 11, when worn by the occupant M, includes a shoulder belt portion 12 that extends from the tongue 20 toward the retraction mechanism 15, is positioned in front of the upper body MU of the occupant M, and is capable of restraining the upper body MU of the occupant M, and a lap belt portion 13 that extends from the tongue 20 toward the lower end 11b, is positioned in front of the waist MW of the occupant M, and is capable of restraining the waist MW. The occupant M can release the fastening state of the tongue 20 with respect to the buckle 19 and remove the tongue 20 from the buckle 19 by pressing a release button (not shown) provided on the buckle 19.

[0015] The retraction mechanism 15 has a pretensioner mechanism 16 configured to stop the seat belt 11 from being pulled out suddenly, and to retract the pulled-out seat belt 11 in the event of a vehicle collision, etc. The pretensioner mechanism 16 is a general-purpose mechanism that activates a built-in gas generator to rotate the shaft around which the seat belt 11 is wound, thereby retracting the seat belt 11 instantly.

[0016] The inflator 24 is composed of an inflator body 25 that releases inflation gas, and a pipe section 26 that guides the inflation gas released from the inflator body 25 to the airbag 30. The inflator body 25 is attached to a seat frame 4 that supports the seat bottom 5 of the seat 1. The pipe section 26 extends from the inflator body 25 and is bent in a generally L-shape so as to run from the bottom surface of the seat bottom 5 along the side surface.

[0017] The bag assembly 29 includes an airbag 30 having a bag main body 30a and a conduit 30b, a bag connecting portion 52, and a bag cover 59. Before the airbag 30 is deployed, the bag main body 30a is folded and stored inside the bag cover 59. The conduit 30b of the airbag 30 is connected to the pipe 26 of the inflator 24, and takes in inflation gas released from the inflator 24 and guides it to the bag main body 30a. The base end 30bx2 of the conduit 30b of the airbag 30 and the pipe 26 of the inflator 24 are connected by being fastened with a clamp 27.

[0018] Next, the protective operation of the occupant protection device 10 for the occupant M will be described. First, when the vehicle collides, the pretensioner mechanism 16 of the retraction mechanism 15 is activated, and the seat belt 11 worn by the occupant M is retracted to stabilize the seating position of the occupant M in the seat 1. As a result, the lap belt portion 13 of the seat belt 11 is retracted toward the tongue 20, and the shoulder belt portion 12 connected to the lap belt portion 13 is retracted toward the shoulder of the occupant M. Thereafter, the inflator 24 is activated, and inflation gas is supplied from the inflator body 25 through the pipe portion 26 and the conduit portion 30b of the airbag 30 to the bag main body portion 30a of the airbag 30, causing the bag main body portion 30a to inflate. As a result, the upper body MU of the occupant M, which is moving forward, is received by the bag main body portion 30a, and the occupant M is protected.

[0019] Next, the configuration of the bag assembly 29 will be described. Fig. 5 is a cross-sectional view of the bag assembly 29 taken along line AA shown in Fig. 3. Fig. 6 is a perspective view of the bag assembly 29 from below with the airbag 30 inflated, with the bag cover 59 omitted. Fig. 7 is an exploded plan view of the airbag 30. As shown in Figs. 5, 6, and 7, the bag assembly 29 includes the airbag 30, a bag connecting portion 52, and a bag cover 59.

[0020] The airbag 30 is composed of a bag main body 30a that is inflated by inflation gas to receive the occupant M, a conduit 30b that is connected to the pipe 26 of the inflator 24 and guides the inflation gas released from the inflator 24 to an inlet 30a1a of the bag main body 30a, allowing the inflation gas to flow into the bag main body 30a, and a tether 30c that is connected to the outer peripheral surface of the bag main body 30a. The bag main body 30a and the conduit 30b are connected by stitching.

[0021] When fully inflated, the bag main body 30a has a rear wall 30a1 that is positioned immediately in front of the occupant M and that abuts against and receives the upper body MU of the occupant M as the occupant M moves forward, a front wall 30a2 that is positioned in front of the rear wall 30a1 and spaced apart from it, and an upper wall 30a3 that connects the upper portions of the rear wall 30a1 and the front wall 30a2. The front wall 30a2 is positioned on the opposite side of the rear wall 30a1 from the occupant M side. Furthermore, because the rear wall 30a1 and the front wall 30a2 are spaced apart in the front-to-rear direction, a gap 35 is formed between the rear wall 30a1 and the front wall 30a2 below the upper wall 30a3. Tether 30c has one end 30c1 connected to rear wall 30a1 and the other end 30c2 connected to front wall 30a2 below upper wall 30a3, i.e., in gap 35 between rear wall 30a1 and front wall 30a2. In other words, upper wall 30a3 connects front wall 30a2 and rear wall 30a1 above tether 30c. Rear wall 30a1 has an inlet 30a1a at its lower portion, which is an opening for allowing inflation gas from conduit 30b to flow in. The shape of bag body 30a is formed by bending the generally rectangular parallelepiped bag body 30a due to the tension of tether 30c.

[0022] The bag body 30a is formed by sewing together the edge portions 61a, 62a of two substantially rectangular (strip-shaped) base fabrics 61, 62, which are woven fabrics formed by plain weaving polyester fibers or the like. The base fabric 61 is configured so that its longitudinal length is longer than that of the base fabric 62 and its lateral length is the same. A portion 61d of the base fabric 61 that is longer than the base fabric 62 is sewn at its tip end 61d1 to a tether stitching portion 61e of the base fabric 61 outside the bag body 30a, thereby forming the tether 30c. Forming the bag body 30a from a substantially rectangular material in this manner improves the yield of the airbag 30. Furthermore, forming the tether 30c using the base fabric 61 used to form the bag body 30a reduces the amount of material used to form the airbag 30. If this point is not taken into consideration, the tether 30c may be formed by connecting a different base fabric or a piece of other material to the outer circumferential surface of the bag body 30a. Furthermore, in order to ensure the thickness of the rear wall 30a1, the front wall 30a2, and the upper wall 30a3, two types of generally rectangular internal tethers 63, 64 are provided inside the bag body 30a to separate the two base fabrics 61, 62. The internal tether 63 is configured to have a longer length in the longitudinal direction and the same length in the lateral direction as the internal tether 64. The internal tether 63 is sewn to tether stitching portions 61b, 62b of the base fabrics 61, 62, and the internal tether 63 is sewn to tether stitching portions 61c, 62c of the base fabrics 61, 62.

[0023] Conduit 30b is a tubular member that is connected to pipe 26 of inflator 24 and bag body 30a, respectively, and extends along the longitudinal direction of lap belt 13. Conduit 30b has communication port 30b1 that communicates with inlet 30a1a of bag body 30a. Inflation gas inside conduit 30b flows into bag body 30a via communication port 30b1 and inlet 30a1a.

[0024] Conduit 30b is formed by sewing together edge portions 67a, 68a of lower and upper members 67 and 68, which are made of the same bag base fabric as bag body 30a. Lower member 67 is connected to bag connecting portion 52 by being sewn to bag connecting portion 52 at seam 67b. Upper member 68 is formed with communication opening 30b1, and a periphery 68b of communication opening 30b1 is sewn to a periphery 62e of inlet 30a1a formed in base fabric 62 that forms bag body 30a, thereby connecting upper member 68 to bag body 30a. Lower member 67 and upper member 68 have the same outer dimensions.

[0025] The bag connecting portion 52 is a tubular member made of the same material as the bag base fabric that forms the airbag 30, and is a member that connects the airbag 30 to the lap belt portion 13. The space inside the tube of the bag connecting portion 52 serves as a belt insertion portion 52a through which the lap belt portion 13 is inserted. After the lap belt portion 13 is inserted into the belt insertion portion 52a, the bag connecting portion 52 and the lap belt portion 13 are connected by sewing the two together. In addition, the upper surface of the bag connecting portion 52 is connected by sewing to a seam 67b of a lower member 67 that forms the conduit portion 30b of the airbag 30.

[0026] The bag cover 59 is a cylindrical member made of fabric such as that used for the material of the seat 1. The bag cover 59 accommodates the bag main body 30a of the airbag 30 in a folded state inside the cylinder, part of the conduit 30b, the bag connecting portion 52, and the portion of the lap belt 13 that is assembled to the bag assembly 29. When the bag main body 30a of the airbag 30 inflates, the bag cover 59 receives pressure from the bag main body 30a, and a portion of the bag cover 59 breaks, allowing the bag main body 30a to be pulled out from the bag cover 59.

[0027] Next, the positional relationship between the bag main body 30a and the surrounding components when the airbag 30 is inflated will be described. Fig. 8 is a view from the left side of the periphery of the seat 1 when the airbag 30 is inflated with the seat 1 positioned rearward and the distance between the seat 1 and the handlebars 80 being large. Fig. 9 is a view from the left side of the periphery of the seat 1 when the airbag 30 is inflated with the seat 1 positioned forward and the distance between the seat 1 and the handlebars 80 being small.

[0028] 8, when the distance between the seat 1 and the handlebars 80 is great, the bag main body 30a of the airbag 30 first inflates upward and forward, and then the tip 30ax side hangs down due to gravity. As a result, the tether 30c is caught on and locked to the knees MK (supporting body) of the occupant M from above, and the bag main body 30a is supported by the knees MK of the occupant M via the tether 30c. By catching and locking the tether 30c on the knees MK in this way and supporting the bag main body 30a via the tether 30c, the bag main body 30a is stably supported by the knees MK of the occupant M, making it easier to position the bag main body 30a in the intended position, and also making it easier for the bag main body 30a to receive a reaction force from the knees MK and the thighs connected to the knees MK. In other words, if the upper wall portion 30a3 is located below the tether 30c, when the upper wall portion 30a3 containing inflation gas contacts the knee region MK, the repulsive force of the upper wall portion 30a3 tends to repel the upper wall portion 30a3 from the knee region MK, which may result in the bag body portion 30a not being stably supported by the knee region MK. On the other hand, if the upper wall portion 30a3 is located above the tether 30c as in this embodiment, the tether 30c containing no inflation gas is hooked and locked along the upper surface of the knee region MK, thereby ensuring a large contact area between the tether 30c and the knee region MK and increasing the frictional force, thereby stably supporting the bag body portion 30a on the knee region MK via the tether 30c. This makes it easier to position the bag body portion 30a at the intended position and also makes it easier for the bag body portion 30a to receive a reaction force from the knee region MK and the thighs connected to the knee region MK. In addition, in order to position the front wall portion 30a2 of the bag main body portion 30a in front of the knees MK of the occupant M to make it easier for the tether 30c to be caught on the knees MK and to adequately protect the knees MK of the occupant M, it is preferable that the length L (Figure 6) between one end 30c1 and the other end 30c2 of the tether 30c be 300 mm or more.

[0029] As shown in FIG. 9 , when the seat 1 and the handlebar 80 are close to each other, the bag body 30a of the airbag 30 first inflates upward and forward so as to climb over the handlebar 80, and then the tip 30ax side of the airbag 30 sags due to gravity. At this time, the handlebar 80 is disposed in the gap 35 formed between the rear wall 30a1 and the front wall 30a2 of the bag body 30a. Therefore, when the bag body 30a inflates and expands, the bag body 30a and the handlebar 80 are unlikely to interfere with each other, and the expansion of the bag body 30a is unlikely to be hindered. As described above, according to the occupant protection device 10 of this embodiment, even when the handlebar 80 is present in front of the seat 1 as an obstruction, interference between the bag body 30a and the handlebar 80 is suppressed, and the handlebar 80 can be prevented from hindering the expansion of the bag body 30a of the airbag 30.

[0030] Furthermore, the bag main body 30a that has climbed over the handle 80 is supported by the ring portion 80a of the handle 80 via the tether 30c, as the tether 30c is caught from above on and locked onto the upper surface of the ring portion 80a of the handle 80 (support) that the occupant M grasps to rotate and steer. By having the tether 30c caught and locked onto the handle 80 in this manner and supporting the bag main body 30a via the tether 30c, the bag main body 30a is stably supported by the handle 80, making it easier to position the bag main body 30a in the intended position and making it easier for the bag main body 30a to receive a reaction force from the handle 80. In other words, if the upper wall portion 30a3 is located lower than the tether 30c, when the upper wall portion 30a3 into which inflation gas has flowed comes into contact with the handle 80, the repulsive force of the upper wall portion 30a3 is likely to repel the upper wall portion 30a3 from the handle 80, and the bag main body 30a may not be stably supported by the handle 80. On the other hand, when the upper wall portion 30a3 is disposed above the tether 30c as in this embodiment, the tether 30c without inflation gas flowing therein is caught and locked along the upper surface of the ring portion 80a of the handle 80, thereby ensuring a large contact area between the tether 30c and the handle 80 and increasing the frictional force, allowing the bag main body portion 30a to be stably supported on the handle 80 via the tether 30c. This makes it easier to position the bag main body portion 30a in the intended position and also makes it easier for the bag main body portion 30a to receive a reaction force from the handle 80.

[0031] In this embodiment, the occupant protection device 10 is described as being installed in the driver's seat of the vehicle, but the present invention is not limited to this, and the occupant protection device 10 can also be installed in the rear seat or passenger seat of the vehicle. For example, when the airbag 30 is installed in the passenger seat of the vehicle, as shown in Fig. 10, when the airbag 30 is inflated with the seat 1 and the instrument panel 95 in front of the seat 1 being far apart, the tether 30c is caught and locked from above on the knees MK of the occupant M seated in the passenger seat, and the bag main body 30a is supported by the knees MK of the occupant M via the tether 30c.

[0032] In addition, in this embodiment, the occupant protection device 10 has been described using as an example a so-called three-point seat belt 11 in which the seat belt 11 has the shoulder belt portion 12 and the lap belt portion 13, but the present invention is not limited to this. That is, even if the present invention is applied to a so-called two-point seat belt 11 in which the seat belt 11 does not have the shoulder belt portion 12 but has the lap belt portion 13, the same effects as those described above can be obtained. [Explanation of symbols]

[0033] 1...seat, 10...occupant protection device, 11...seat belt, 13...lap belt portion, 15...retraction mechanism, 19...buckle, 20...tongue, 24...inflator, 30...airbag, 30a...bag main body portion (main body portion), 30a1...rear wall portion, 30a2...front wall portion, 30a3...upper wall portion, 30b...conduit portion, 30c...tether, 61, 62...base fabric, 80...handle (support), M...occupant, MK...knee portion (support), MW...waist portion

Claims

1. An occupant protection device for protecting an occupant seated in a vehicle seat, a seat belt including at least a tongue, a buckle to which the tongue is coupled, and a lap belt portion that restrains a waist region of the occupant seated in the seat when the tongue is coupled to the buckle; an inflator that generates inflation gas; an airbag provided on the lap belt portion, the airbag having: a main body that is inflated by being supplied with inflation gas to receive the occupant; a conduit that is connected to the inflator and guides the inflation gas generated from the inflator to the main body so that the inflation gas flows into the main body; and a tether that is connected to an outer peripheral surface of the main body; Equipped with When the inflation is complete, the main body portion a rear wall portion that contacts the occupant; a front wall portion disposed in front of the rear wall portion at a distance from the rear wall portion, the front wall portion having one end of the tether connected to the rear wall portion and the other end of the tether connected to the rear wall portion; an upper wall portion connecting the rear wall portion and the front wall portion above the tether; and The tether is connected to the main body along the left-right direction, The tether is hooked and engaged with the support body along an upper surface thereof, thereby supporting the main body on the support body via the tether.

2. An occupant protection device for protecting an occupant seated in a vehicle seat, a seat belt including at least a tongue, a buckle to which the tongue is coupled, and a lap belt portion that restrains a waist region of the occupant seated in the seat when the tongue is coupled to the buckle; an inflator that generates inflation gas; an airbag provided on the lap belt portion, the airbag having: a main body that is inflated by being supplied with inflation gas to receive the occupant; a conduit that is connected to the inflator and guides the inflation gas generated from the inflator to the main body so that the inflation gas flows into the main body; and a tether that is connected to an outer peripheral surface of the main body; Equipped with When the inflation is complete, the main body portion a rear wall portion that contacts the occupant; a front wall portion disposed in front of the rear wall portion at a distance from the rear wall portion, the front wall portion having one end of the tether connected to the rear wall portion and the other end of the tether connected to the rear wall portion; an upper wall portion connecting the rear wall portion and the front wall portion above the tether; and The tether is hooked onto and locked to the support body, whereby the main body is supported by the support body via the tether; The main body is formed of a base fabric, The tether is formed from a part of the base fabric that forms the main body.

3. An occupant protection device for protecting an occupant seated in a vehicle seat, a seat belt including at least a tongue, a buckle to which the tongue is coupled, and a lap belt portion that restrains a waist region of the occupant seated in the seat when the tongue is coupled to the buckle; an inflator that generates inflation gas; an airbag provided on the lap belt portion, the airbag having: a main body that is inflated by being supplied with inflation gas to receive the occupant; a conduit that is connected to the inflator and guides the inflation gas generated from the inflator to the main body so that the inflation gas flows into the main body; and a tether that is connected to an outer peripheral surface of the main body; Equipped with When the inflation is complete, the main body portion a rear wall portion that contacts the occupant; a front wall portion disposed in front of the rear wall portion at a distance from the rear wall portion, the front wall portion having one end of the tether connected to the rear wall portion and the other end of the tether connected to the rear wall portion; an upper wall portion connecting the rear wall portion and the front wall portion above the tether; and The tether is hooked onto and locked to the support body, whereby the main body is supported by the support body via the tether; The support body is a handle mounted on the vehicle.

4. 2. The occupant protection device according to claim 1, wherein the support body is the knees of the occupant.

5. a retracting mechanism capable of retracting the seat belt; 5. The passenger protection device according to claim 1, wherein the inflator and the winding mechanism are mounted on the seat.

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