Occupant protection device

Abstract

An occupant protection device (S) for protecting an occupant (MP) seated on a seat (1) has a seat belt (7) and an airbag (25) disposed in a region of a safety waist belt (10) of the seat belt. The airbag is able to move in displacement with respect to the safety waist belt in a state of a folded body (55). The folded body is connected to a seat side via a position adjustment unit (50L, 50R) at the time of wearing of the seat belt by the occupant. Each position adjustment unit is formed of an elongated elastic body having an equal spring constant, connects each front end (50a) to a position in the vicinity of a buckle ring (12) connected to a belt buckle (13) of the seat belt and a position substantially left-right symmetrical with respect to the belt buckle on the seat side, and is able to elastically deform to dispose the folded body substantially at the center in a left-right direction of the seat.

Description

TECHNICAL FIELD

[0001] The present application relates to an occupant protection device for protecting an occupant seated on a seat. BACKGROUND

[0002] Currently, as an occupant protection device, as shown in Japanese Patent Application Publication No. 2021-160413,

[0003] There is a structure in which a holding body that holds a folded airbag is attached to the periphery of the waist of an occupant seated on a seat, and in operation, the occupant seated on the seat is protected by the inflated airbag. With regard to the occupant protection device of this structure, the holding body is attached to the periphery of the waist of the occupant, and thus the position of the folded airbag (folded body) differs depending on the body shape of the occupant (difference in waist size). In order to stably restrain the occupant with the inflated airbag, it is preferable to inflate the airbag so that the central position of the left and right is substantially aligned with the central position of the left and right of the occupant, and with regard to the current occupant protection device, the position adjustment unit is arranged on both sides of the folded body, so that the position of the folded airbag (folded body) with respect to the occupant can be adjusted by the inflated airbag. Specifically, with regard to the current occupant protection device, as the position adjustment unit, a corrugated tube-shaped structure composed of a rubber-like elastic body is arranged on both sides of the folded body around the holding body, and thus the position adjustment of the folded body with respect to the occupant is performed by the reaction force of the position adjustment unit.

[0004] However, with regard to the current occupant protection device, the length dimensions of the left and right position adjustment units are different, and thus the left and right position adjustment units are difficult to exert equal reaction forces, and there is room for improvement in reliably adjusting the position of the folded body when worn so that the central position in the length direction is substantially aligned with the central position of the left and right of the occupant. SUMMARY

[0005] An object of the present application is to provide an occupant protection device that can reliably adjust the position of a folded airbag according to the body shape of an occupant seated when worn.

[0006] The present application relates to an occupant protection device of the following structure.

[0007] An occupant protection device for protecting an occupant seated on a seat,

[0008] is formed in a structure having: a seat belt; and an airbag arranged in the seat belt in a region of a safety waist belt that restrains the waist of the occupant when worn,

[0009] The airbag is formed in a structure of being formed as a bag by a sheet body having flexibility, being held to the safety belt in a state of being folded in a folded completed body in a manner of being able to be moved in displacement with respect to the safety belt, and being formed in a structure of being connected to an inflator arranged on the seat side, and inflating in a manner of protruding from the safety belt toward an upper front by inflow of an inflation gas into the inside,

[0010] The folded completed body is constituted in a manner of being connected to the seat side via a position adjustment unit when the occupant wears the seat belt, whereby the position with respect to the safety belt can be adjusted,

[0011] The position adjustment unit is formed in a structure of being formed by an elongated elastic body, and being arranged so as to extend from both end sides of the folded completed body in a direction along the safety belt in a state of wearing of the seat belt, and the leading end side is connected to the seat side,

[0012] The position adjustment units are formed in a structure of being provided with equal elastic coefficients, and the leading ends are connected to positions in the seat belt which are in the vicinity of a buckle ring connected to a belt buckle provided on the seat side, and which are substantially left-right symmetrical with respect to the belt buckle on the seat side, and are constituted in a manner of being elastically deformed in a state of wearing of the seat belt, and being able to arrange the folded completed body at substantially the center in the left-right direction of the seat.

[0013] The occupant protection device according to the present application is constituted in a structure of arranging a folded completed body formed by folding an airbag so as to extend from both end sides in a state of wearing of a seat belt, and being able to adjust the position with respect to a safety belt by two position adjustment units which connect the leading end side to the seat side, the position adjustment units are formed by elongated elastic bodies, and the leading end side is connected to positions on the seat side which are substantially left-right symmetrical. That is, the occupant protection device according to the present application sets the length dimension of the position adjustment units which extend from the folded completed body in the left-right direction to be substantially the same, and sets the elastic coefficients to be equal, and thus is able to move the folded completed body in displacement with respect to the safety belt by the equal elastic force of the position adjustment units, and is able to easily perform the alignment so that the center is substantially coincident with the center in the length direction of the safety belt. As a result, the occupant protection device according to the present application is able to easily arrange the folded completed body at a position which is substantially the center in the length direction of the safety belt (that is, substantially the center in the left-right of the occupant seated on the seat) even if the amount of leading out of the safety belt arranged around the waist circumference differs according to the body shape (size of the waist circumference) of the occupant in a state of wearing of the seat belt.

[0014] Therefore, regarding the occupant protection device of the present application, the arrangement position of the folded airbag can be reliably adjusted according to the body shape of the occupant seated when worn.

[0015] Further, regarding the occupant protection device of the present application, each position adjustment unit is formed in a structure in which a tensile load acts in a state in which the seat belt is worn, compared to before the seat belt is worn, and thus the occupant side is brought into close contact with the folded completed body by the tensile load of the position adjustment unit acting when the seat belt is worn, and the safety lap belt can be brought into close contact with the occupant side, and thus is preferable. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a perspective view of a seat on which the occupant protection device of the embodiment of the present application is mounted.

[0017] Figure 2 is a right view of the seat of Figure 1 , showing a state in which a seat belt is worn.

[0018] Figure 3 is a left view of the seat of Figure 1 , showing a state in which a seat belt is worn.

[0019] Figure 4 is a front view of the seat of Figure 1 , showing a state in which a seat belt is worn.

[0020] Figure 5 is a schematic perspective view showing a state in which a single body of an airbag used in the occupant protection device of the embodiment is inflated.

[0021] Figure 6 is a schematic longitudinal sectional view of the airbag of Figure 5

[0022] Figure 7 is a schematic perspective view showing a folded completed body of the occupant protection device of the embodiment covered by a cover portion, and a safety lap belt.

[0023] Figure 8 is a schematic plan view showing a portion of the folded completed body covered by the cover portion in the occupant protection device of the embodiment.

[0024] Figure 9 is a schematic partially enlarged perspective view showing a holding plate portion of the cover portion, the safety lap belt, and a position adjustment unit in the occupant protection device of the embodiment.

[0025] Figure 10 is a front view of a seat in a state in which inflation of an airbag is completed in the occupant protection device of the embodiment.

[0026] ​Figure 11 This is a left view of the seat in the occupant protection device of the embodiment, with the airbag fully inflated. Detailed Implementation

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Figures 1-4 As shown, the occupant protection device S of the embodiment is mounted on the seat 1 of a vehicle and is configured to include the following components: a seat belt 7; an airbag 25; an inflator 17 that supplies inflation gas to the airbag 25; a cover 45 that covers the periphery of the folded body 55 formed by folding the airbag 25; and a position adjustment unit 50 that can adjust the position of the folded body 55 relative to the lap belt 10 described later. The seat 1 has a backrest 2 and a seat 3.

[0028] In one embodiment, the seat belt 7 is configured to be mounted on the seat 1 and includes: a belt body 8 for restraining the occupant MP seated in the seat 1; a buckle 12 mounted on the belt body 8; and a buckle 13 for attaching the buckle plate.

[0029] 12. The buckle 13 is located on the right rear end 3c side of the seat 3 of the seat 1 (near the right side of the boundary between the backrest 2 and the seat 3) (see reference). Figure 1 , 2 The main body 8 is configured such that one end is engaged with the winding shaft of a retractor (not shown) disposed inside the backrest 2, and the other end is engaged with an anchoring member 14 disposed on the left rear end 3b side of the seat portion 3 of the seat 1 (see reference). Figure 1 , 3 When worn, it can be unwound from the retractor. Specifically, the strap body 8 is configured to protrude outwards from the upper left edge of the backrest 2. In the embodiment, when the occupant MP is not seated, such as... Figure 1 As shown, the safety belt 10 of the airbag 25 is configured to protrude from the front surface of the backrest 2. Specifically, in the non-seated state of the occupant MP, as... Figure 1 As shown, the safety lap belt 10 extends approximately vertically along the left edge 2a of the backrest 2 and protrudes from the front surface of the backrest 2. The belt body 8 is structured to include: a safety lap belt 10; and a shoulder strap 9, which is housed within the backrest 2. When the occupant is seated and the buckle 12 is connected to the buckle 13, the safety lap belt 10, positioned approximately horizontally between the anchoring member 14 and the buckle 13, restrains the lower body MD (waist) of the occupant MP. The shoulder strap 9, which extends from the upper left edge of the backrest 2 and is obliquely positioned to the buckle 13, restrains the upper body MU (from shoulder to chest) of the occupant MP (see reference). Figure 2 , 3). With respect to the seat belt 7, an unillustrated retractor provided in the backrest portion 2 has a pretensioning mechanism.

[0030] The inflator 17 is provided on the side of the seat 1, specifically, on the lower side than the seat surface 3a in the case of the embodiment. Specifically, as shown in Figure 2 , the inflator 17 has an approximately cylindrical inflator main body 18 (omitted from detailed illustration) provided on the lower side than the seat portion 3 on the back side of the seat 1 so that the axial direction is substantially along the left-right direction, and a tube portion 19 extending from the inflator main body 18 and supplying the airbag 25 with inflation gas. The tube portion 19 is formed in a structure that extends from the inflator main body 18 and is provided so that the front end is located near the boundary portion between the seat portion 3 and the backrest portion 2 on the left side of the seat 1, and the front end is connected to the aforementioned conduit portion 35 of the airbag 25 with a clamp 20 (refer to Figure 1 , 2 ). In the case of the embodiment, the inflator main body 18 is set so that the start of operation for limiting the extraction of the belt body 8 of the seat belt 7 accompanying the inflation of the airbag 25 is later than the pretensioning mechanism of the seat belt 7.

[0031] As shown in Figure 5 , 6 , the airbag 25 has an airbag main body 26 that inflates in a manner to protect the occupant MP, a conduit portion 35 that is connected to the inflator 17 and causes the inflation gas to flow into the airbag main body 26, and a mounting portion 40 for holding the airbag main body 26 to the safety belt 10.

[0032] The airbag main body 26 is configured in such a manner that the outer shape at the time of completion of inflation is formed in an approximately triangular prism shape with the axial direction substantially along the left-right direction, the completed inflation shape when viewed from the side of the left and right is formed in an approximately right-angled triangle with an oblique side on the front side, and the completed inflation shape when viewed from the front and rear direction side is formed in an approximately long rectangle with a large upper and lower width (refer to Figure 10 , 11 ). As shown in Figure 5 , 6 , the airbag main body 26 has a rear wall portion 28 provided on the occupant MP side (rear side) at the time of completion of inflation, a front wall portion 27 provided so as to be opposite to the rear wall portion 28 on the front and rear direction side, a lower wall portion 29 provided on the lower end side at the time of completion of inflation, and a left wall portion 30 and a right wall portion 31 provided so as to be opposite on the left and right direction side at the time of completion of inflation. The airbag main body 26 is configured to receive the upper body MU of the occupant MP with the rear wall portion 28 at the time of completion of inflation, and further, when receiving the upper body MU based on the rear wall portion 28, the lower wall portion 29 is brought into abutment with and supported by the thigh portion MT of the occupant MP, thereby receiving the occupant MP (refer toFigure 11 ). The airbag body 26 is formed so that the conduit portion 35 is disposed on the lower surface side of the rear end 29a of the lower wall portion 29, and the inflation gas from the inflator 17 flows into the interior via the conduit portion 35. That is, the communication holes 33, which communicate with the conduit portion 35, are circularly opened in the region on the rear end 29a side of the lower wall portion 29, and in the case of the embodiment, two are provided side by side in the left-right direction. Also, the airbag body 26 is joined to the conduit portion 35 at the portion of the periphery of the communication holes 33.

[0033] In the case of the embodiment, the conduit portion 35 is configured so as to extend to the left side from the lower surface side of the airbag body 26, is connected to the tube portion 19 of the inflator 17, and the base side on the airbag body 26 side is closed, and the front end 37a side is opened so as to be connectable to the tube portion 19. Specifically, as shown in Figure 5 , the conduit portion 35 is formed so as to have a base side portion 36, which is on the lower surface side of the airbag body 26, and a front end side portion 37, which is disposed so as to extend to the left side from the airbag body 26 at the time of completion of inflation. The front end side portion 37 is formed so as to have a smaller width than the base side portion 36. The conduit portion 35 is configured so as to be disposed substantially along the left-right direction in a manner substantially along the safety belt 10 at the time of completion of inflation of the airbag 25, and as described above, is formed so as to be connected by the clamping member 20 at the front end 37a side of the front end side portion 37 to the tube portion 19 of the inflator 17. In the case of the embodiment, as described later, the length dimension of the front end side portion 37 of the conduit portion 35 is set to a dimension (a longer dimension with a margin) that does not affect the position adjustment of the folded completed body 55 (specifically, the cover portion 45, which surrounds the folded completed body 55 and the base side portion 36 of the conduit portion 35 itself) formed by folding the airbag body 26.

[0034] As shown in Figure 5 , 6 , the mounting portion 40 of the airbag body 26 to the safety belt 10 is configured so as to be disposed on the lower surface side of the base side portion 36 of the conduit portion 35, is formed so as to be a substantially cylindrical shape disposed substantially along the left-right direction in a manner substantially along the safety belt 10, and the safety belt 10 is insertable. The mounting portion 40 is formed so as to be connected and held to the safety belt 10 with the airbag 25 inserted into the mounting portion 40.

[0035] In the embodiment, the airbag 25 is formed in a structure such that a region of the airbag main body 26 is folded in a long strip shape, and is held to the safety belt 10 in a state where the folded body 55 formed by folding the airbag main body 26 is able to be moved in displacement with respect to the safety belt 10. Specifically, for the airbag 25, a detailed illustration is omitted, and the airbag main body 26 in a state where it is spread substantially flat is folded in a manner such that the front wall portion 27 overlaps with the rear wall portion 28 and the lower wall portion 29, and the width dimension in the front-rear direction is reduced, and the folded body 55 is formed in a long strip shape substantially along the left-right direction. Also, the airbag 25 is such that the folded body 55 formed by folding the airbag main body 26, and the base portion side portion 36 of the conduit portion 35 overlap with the upper surface side of the safety belt 10 in the wearing state of the seat belt 7, and the entire region including the mounting portion 40 is covered by the cover portion 45, and is disposed in the region of the safety belt 10 (refer to Figure 8 ) in the wearing state of the seat belt 7. In the non-wearing state shown in Figure 1 , the folded body 55 is disposed on the back surface side (backrest portion 2 side) of the safety belt 10 exposed on the front surface of the backrest portion 2. Also, in the case of the embodiment, the front end side portion 37 of the conduit portion 35 is disposed so as to be exposed on the upper surface side of the safety belt 10 and the position adjustment unit 50L on the left side of the folded body 55 (cover portion 45) in the wearing state of the seat belt 7 (refer to Figure 3 , 4 ).

[0036] As shown in Figure 8 , the cover portion 45 has a holding plate portion 46 which is able to hold the folded body 55 formed by folding the airbag main body 26, and a cover main body 48 which covers the periphery of the folded body 55. The holding plate portion 46 is formed in a long strip body which covers the lower surface side of the folded body 55 substantially in the entire region including the base portion side portion 36 of the conduit portion 35 and the lower surface side of the mounting portion 40, and is composed of a plate material made of synthetic resin which has shape retention and is able to be flexed to some extent. In the case of the embodiment, the holding plate portion 46 is disposed in a position on the lower surface side of the safety belt 10 in the wearing state of the seat belt 7. Linking ring portions 47 for linking the base portion 50b side of the position adjustment unit 50 (50L, 50R) are formed on both end sides in the length direction of the holding plate portion 46 (left end 46a side and right end 46b side) (refer to Figure 8 ). Each of the linking ring portions 47 is formed so as to be able to be inserted by the safety belt 10 (belt main body 8) and to protrude in an approximately inverted U shape from the upper surface side of the holding plate portion 46 upward (refer to Figure 9). The cover main body 48 is formed of a sheet body having flexibility, covers the folded body 55 and the periphery of the base portion side 36 of the conduit portion 35 including the mounting portion 40, the safety belt 10, and the holding plate portion 46, and has both end sides opened to allow the safety belt 10 and the position adjustment units 50 (50L, 50R) to be inserted. The cover main body 48 is configured in such a manner that, at the time of deployment and expansion of the airbag 25, a prescribed portion of a region that covers the upper side of the folded body 55 at the time of wearing of the seat belt 7 is ruptured in substantially the entire region in the left-right direction, and the airbag main body 26 is allowed to protrude. The cover portion 45 (the holding plate portion 46 and the cover main body 48) is configured to be able to move in displacement with respect to the safety belt 10 together with the folded body 55 and the base portion side 36 of the conduit portion 35.

[0037] The position adjustment units 50 (50L, 50R) that are able to adjust the position of the folded body 55 with respect to the safety belt 10 are configured in such a manner that, in the case of the embodiment, in the worn state of the seat belt 7, are arranged so as to extend from both end sides (the left end 45a side and the right end 45b side) of the cover portion 45 that covers the periphery of the folded body 55, respectively, and link the front end 50a side with the seat 1 side (see FIG. 8). The position adjustment units 50 (50L, 50R) are configured in such a manner that, in the case of the embodiment, are formed of a long strip-shaped elastic body, and specifically, have a rubber-like elastic body, and are formed of a belt-shaped body having a width that is slightly smaller than the cover portion 45. In the case of the embodiment, the position adjustment units 50 (50L, 50R) are formed to have a width that is smaller than the safety belt 10. Specifically, the position adjustment units 50 (50L, 50R) are arranged so as to substantially follow the safety belt 10 (see FIG. 8) at the upper side of the safety belt 10 at the time of wearing of the seat belt 7 (in the case of the left side position adjustment unit 50L, between the front end side portion 37 of the conduit portion and the safety belt 10). Figures 2-4 ). Specifically, as described above, the position adjustment units 50 (50L, 50R) are arranged so as to extend from the left end 45a side and the right end 45b side of the cover portion 45, respectively, so that the base portion 50b side is linked with the linking ring portion 47 formed on the left end 46a side and the right end 46b side of the holding plate portion 46 of the cover portion 45. That is, in the case of the occupant protection device S of the embodiment, the folded body 55 (the cover portion 45) is configured to be linked with the seat 1 side via the position adjustment units 50L, 50R that extend from the cover portion 45 to the left side and the right side, respectively, at the time of wearing of the seat belt 7, and is configured to be linked with the seat 1 side via the position adjustment units 50L, 50R, whereby the position with respect to the safety belt 10 is able to be adjusted. The position adjustment units 50L, 50R are formed of a long strip-shaped elastic body, and specifically, in the case of the embodiment, have a rubber-like elastic body, and are formed of a belt-shaped body having a width that is slightly smaller than the cover portion 45. In the case of the embodiment, the position adjustment units 50L, 50R are formed to have a width that is smaller than the safety belt 10. Specifically, the position adjustment units 50L, 50R are arranged so as to substantially follow the safety belt 10 (see FIG. 8) at the upper side of the safety belt 10 at the time of wearing of the seat belt 7 (in the case of the left side position adjustment unit 50L, between the front end side portion 37 of the conduit portion and the safety belt 10). Figure 4 、 7 、8). In the case of each of the position adjustment units 50L, 50R, the elastic coefficient is set to be equal, and the length dimension is also set to be substantially the same.

[0038] The right-side position adjustment unit 50R, located on the right side (the buckle 13 side of the seat belt 7), is connected by a connecting unit 51 to the vicinity of the buckle 12 of the buckle 13 located on the seat 1 side when the seat belt 7 is worn. In the embodiment, as... Figure 7 As shown, the buckle 12 is configured to connect the front end to the buckle 13, and has a connecting base 12b that connects the front end 50a of the right position adjustment unit 50R to a position closer to the base than the insertion slit 12a into which the safety belt 10 is inserted. The front end 50a of the right position adjustment unit 50R is connected to the connecting base 12b that is exposed to the outside when the buckle 12 is installed to the buckle 13 (see reference). Figure 2 In the seat portion 3 of the seat 1, at a position approximately symmetrical to the buckle 13 (on the left rear end 3b side of the seat portion 3 (the left side near the boundary between the backrest 2 and the seat portion 3)), in the embodiment, the left position adjustment unit 50L, located on the left side, is connected to the front end 50a near the rear side of the anchoring member 14 via the connecting unit 52. The right position adjustment unit 50R is configured such that, in... Figure 1 In the non-wearing state, the seat belt 7 shown connects the front end 50a to the buckle 12 approximately along the lap belt 10 exposed on the front surface of the backrest 2.

[0039] Furthermore, each position adjustment unit 50 (left position adjustment unit 50L and right position adjustment unit 50R) is configured such that it elastically deforms when the seat belt 7 is worn, allowing the folded body 55 (cover 45) to be positioned approximately at the center of the seat 1 in the left-right direction. Specifically, in this embodiment, each position adjustment unit 50 (left position adjustment unit 50L and right position adjustment unit 50R) is configured to apply approximately the same tensile load when the seat belt 7 is worn, compared to before the seat belt 7 is worn, thereby aligning the folded body 55 (cover 45) with the approximate center of the seat 1 in the left-right direction (i.e., the approximate center of the occupant MP sitting in the seat 1 in the left-right direction) (see reference). Figure 4 ).

[0040] The passenger protection device S of the embodiment further includes the cover portion 45 that covers the folded body 55 and the periphery of the base portion side portion 36 of the conduit portion 35, and is configured to cover the folded body 55 and the periphery of the base portion side portion 36 of the conduit portion 35 substantially without a gap, but is not connected to the airbag 25. Further, the position adjustment units 50 (50L, 50R) are formed so as to extend from the cover portion 45. That is, in the case of the embodiment, the folded body 55 is formed so as to be connected to the position adjustment units 50 (50L, 50R) via the cover portion 45, and the position adjustment units 50 (50L, 50R) extend from both end sides in the direction along the safety belt 10.

[0041] The passenger protection device S of the embodiment, in a state in which the occupant MP wears the seat belt 7 and sits on the seat 1 mounted on the vehicle, if the inflator 17 operates, the inflation gas discharged from the inflator 17 flows into the airbag main body 26 via the conduit portion 35, the airbag main body 26 of the airbag 25 breaks the cover portion 45, protrudes upward and forward from the safety belt 10, and as shown in Figure 10 、 11 indicated, is inflated.

[0042] Further, the passenger protection device S of the embodiment is configured so that the folded body 55 formed by folding the airbag 25 is configured to extend from both end sides (in the case of the embodiment, the left end 45a and the right end 45b of the cover portion 45 that covers the periphery of the folded body 55) when the seat belt 7 is worn, the positions with respect to the safety belt 10 can be adjusted by the two position adjustment units 50L, 50R that connect the front end 50a side and the seat 1 side, respectively, the two position adjustment units 50L, 50R are formed of an elongated elastic body, and the front end 50a side is connected to substantially left-right symmetrical positions on the seat 1 side with equal elastic coefficients. That is, the passenger protection device S of the embodiment sets the length dimension of the position adjustment units 50L, 50R that extend from the folded body 55 (cover portion 45) on the left and right sides to be substantially the same, and sets the elastic coefficients to be equal, so that the folded body 55 (cover portion 45) can be shifted and moved with respect to the safety belt 10 by the equal elastic force of the position adjustment units 50L, 50R, and the center can be easily aligned to be substantially coincident with the center in the length direction of the safety belt 10. As a result, the passenger protection device S of the embodiment, at the time of wearing the seat belt 7, even if the amount of extraction of the safety belt 10 disposed around the waist circumference differs depending on the body shape (size of the waist circumference) of the occupant MP, the folded body 55 (cover portion 45) can be easily disposed at a position substantially at the center in the length direction of the safety belt 10 (that is, substantially at the center of the left and right of the occupant MP sitting on the seat 1).

[0043] Therefore, regarding the occupant protection device S of the embodiment, it is possible to reliably adjust the arrangement position of the folded airbag 25 according to the body shape of the seated occupant MP at the time of wearing.

[0044] Further, regarding the occupant protection device S of the embodiment, it is formed in a structure in which each position adjustment unit 50L, 50R acts with a tensile load in the state of wearing of the seat belt 7 compared to before wearing of the seat belt 7. Therefore, at the time of wearing of the seat belt 7, the folded completed body 55 (cover portion 45) is brought into close contact with the occupant MP side by the tensile load acting at the position adjustment unit 50L, 50R, and it is possible to bring the safety lap belt 10 into close contact with the occupant MP side. Further, if this is not taken into consideration, as the position adjustment unit, for example, a structure in which a compressive load acts and which is capable of adjusting the position of the folded completed body can be used.

[0045] Further, regarding the occupant protection device S of the embodiment, it is formed in a structure in which the seat belt 7 and the inflator 17 are mounted to the seat 1. Therefore, it is possible to reliably protect the occupant MP seated on the seat 1 with the airbag 25 also in the case of using the seat 1 in a state of moving with respect to the vehicle, by greatly sliding or rotating the seat 1 in the front-rear direction. Of course, the occupant protection device of the present application is not limited to the seat of this structure, and it is also possible to mount the retractor to a seat of a type in which the occupant is restrained with a seat belt provided on the vehicle body side. Further, the inflator can also be formed in a structure mounted to the vehicle body side of the vehicle.

Claims

1. An occupant protection device (S) for protecting an occupant (MP) seated on a seat (1), wherein a seat belt (7) is formed, and an airbag (25) is arranged in the seat belt in a region of a safety waist belt (10) that restrains a waist of the occupant when worn, the airbag is formed in a bag shape constituted by a sheet body having flexibility, is held to the safety waist belt in a state of a folded completed body (55) in a manner so as to be able to move in displacement with respect to the safety waist belt, and is formed in a manner so as to be connected to an inflator (17) arranged on the seat side, so that inflation gas flows into the inside to inflate in a manner so as to protrude from the safety waist belt toward the front upper side, the folded completed body is constituted in a manner so as to be linked to the seat side via a position adjustment unit (50 (50L, 50R)) when the occupant wears the seat belt, so that the position with respect to the safety waist belt can be adjusted, the position adjustment unit is formed in a manner so as to be formed by an elongated elastic body, and is arranged so as to extend from both end sides of the folded completed body in a direction along the safety waist belt in a worn state of the seat belt, so that a front end (50a) side is linked to the seat side, each of the position adjustment units is formed in a manner so as to have equal elastic coefficients, so that each of the front ends is linked to positions in the seat belt that are approximately left-right symmetrical with respect to the seat side and are in the vicinity of a buckle (12) linked to a belt buckle (13) provided on the seat side, and is constituted in a manner so as to be elastically deformed in a worn state of the seat belt, so that the folded completed body can be arranged at approximately the center in the left-right direction of the seat, a cover portion that covers the periphery of the folded completed body has a holding plate portion that is arranged on the lower surface side of the folded completed body so as to be able to hold the folded completed body, and a cover main body that covers the periphery of the folded completed body, each of the position adjustment units has a base portion side linked to both end sides in the length direction of the holding plate portion, the holding plate portion is formed in a manner so as to be constituted by an elongated body having shape holding properties and being able to be elastically deformed to some extent, and is able to cover the lower surface side of the folded completed body in the entire region, is arranged at a position on the lower surface side of the safety waist belt, and has linking ring portions for linking the position adjustment units formed on both end sides in the length direction so as to protrude upward from the holding plate portion and constituted so as to be able to have the safety waist belt inserted, and the position adjustment units are arranged so as to extend from each of the linking ring portions.

2. The occupant protection device (S) according to claim 1, wherein each of the position adjustment units (50 (50L, 50R)) is formed in a manner so as to be subjected to a tensile load in a worn state of the seat belt (7) compared to before the seat belt is worn.

3. The occupant protection device (S) according to claim 1, wherein the airbag (25) is formed in a structure having an airbag main body (26) which inflates in a manner capable of protecting the occupant (MP) and a conduit portion (35) which extends from a lower surface side of the airbag main body, connects a front end side to the inflator (17) to cause inflating gas to flow into the airbag main body, and holds the airbag (25) at the lower surface side of the conduit portion to the safety belt (10), a length dimension of a front end side portion (37) of the conduit portion which is disposed in a manner extending from the airbag main body at the time of completion of inflation is set to a dimension which does not affect position adjustment of the folded completed body.

4. The occupant protection device (S) according to claim 1, wherein the inflator (17) and the seat belt (7) are mounted on a seat (1).

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