JP7740126B2 - Occupant protection devices - Google Patents

Description

The present invention relates to an occupant protection device configured to protect an occupant seated in a seat.

Conventional occupant protection devices have been configured so that an inflator, which supplies inflation gas to an airbag folded and stored around the occupant's waist, is located in the area on the lower rear side of the seat where the occupant sits (see, for example, Patent Document 1). Specifically, in conventional occupant protection devices, the inflator is generally cylindrical and includes an inflator main body located on the lower rear side of the seat with its axial direction generally aligned with the left-right direction, and a connecting pipe portion that extends and bends from the inflator main body and connects to the airbag on the side of the seat.

JP 2020-66425 A

In this conventional passenger protection device, the connecting pipe extending from the inflator body is bent and connected to the airbag at a position on the side of the seat. Therefore, when a large impact force acts from either side, such as when a vehicle enters from the side, the connecting pipe may deform, preventing the smooth supply of inflation gas to the airbag and preventing the airbag from inflating smoothly.

The present invention aims to solve the above-mentioned problems by providing an occupant protection device that can smoothly inflate an airbag even when a side impact force is applied.

The occupant protection device according to the present invention is configured to protect an occupant seated in a seat,
an airbag configured to be inflatable in a bag shape so as to cover the front of the occupant and to be held in a folded state by a holding belt part that is wrapped around the waist of the occupant;
an inflator that supplies inflation gas to the airbag;
An occupant protection device having a configuration comprising:
The inflator is
an inflator body having a generally cylindrical shape and attached to a lower rear surface of the seat portion of the seat with its axial direction generally aligned with the left-right direction;
a connecting pipe portion that is bent while extending from the inflator body and is disposed in a side area of the seat portion, and that connects the inflator body and the airbag;
The device is configured to include:
The inflator body is attached to the seat frame side so that it can slide together with the connecting pipe portion relative to the seat frame when an external force acts on the seat side from the left or right side and receives a pressing force acting on the connecting pipe portion.

In the occupant protection device of the present invention, the inflator has a connecting pipe portion connecting the inflator body to the airbag that is bent while extending from the inflator body and positioned in a region to the side of the seat. However, the inflator body is slidable along with the connecting pipe portion relative to the seat frame. Therefore, even if an external force acts on the seat from the left or right side, such as when a vehicle enters from the side, and this external force acts to press against the connecting pipe portion, the connecting pipe portion can be slid along with the inflator body relative to the seat frame, preventing the connecting pipe portion from instantly deforming due to the external force. Furthermore, by sliding the inflator body relative to the seat frame, the pressing force acting on the connecting pipe portion can be absorbed to some extent. In other words, with the occupant protection device of the present invention, the sliding movement of the inflator relative to the seat frame and the energy absorption that accompanies this sliding movement can delay the onset of deformation of the connecting pipe section when an external force acts from the side. This allows inflation gas discharged from the inflator body to flow into the airbag via the connecting pipe section before the connecting pipe section deforms, allowing the airbag to inflate smoothly.

Therefore, the occupant protection device of the present invention allows the airbag to inflate smoothly even when a side impact force is applied.

Specific examples of how the inflator body can be attached to the seat frame include a configuration in which the inflator body is attached to a sliding member that is held so that it can slide relative to the seat frame, or a configuration in which the seat frame is formed with an elongated hole that extends substantially left-right and through which the attachment means extending from the inflator body is inserted, allowing the attachment means to slide within.

1 is a perspective view of a seat equipped with an occupant protection device according to an embodiment of the present invention; FIG. 2 is a side view of the seat of FIG. 1; FIG. 2 is a partially enlarged side view of the seat of FIG. 1 in the vicinity of the location of the inflator. FIG. 2 is a front view of the seat of FIG. 1, showing the seat belt fastened; 2 is a partially enlarged rear view showing the lower end region of the seat portion of the seat of FIG. 1; FIG. FIG. 2 is a partially enlarged rear view of the seat of FIG. 1 in the vicinity of the location of the inflator. 3 is a partially enlarged vertical cross-sectional view of a bracket arrangement portion of the inflator in the occupant protection device according to the embodiment. FIG. 3A and 3B are enlarged partial cross-sectional views showing the vicinity of an inflator arrangement portion in the occupant protection device of the embodiment, showing a state before sliding (when mounted on the vehicle) and a state after sliding; 1 is a schematic perspective view showing an airbag used in an occupant protection device according to an embodiment in a state where the airbag is inflated by itself; FIG. 10 is a schematic longitudinal cross-sectional view of the airbag of FIG. 9 . 1 is a front view of a seat in a state where an airbag has completed inflation in an occupant protection device according to an embodiment; 1 is a side view of a seat in a state where an airbag has completed inflation in an occupant protection device according to an embodiment; FIG. 10 is a partially enlarged schematic front view showing how an inflator is attached to a seat frame in an occupant protection device according to another embodiment of the present invention. FIG. 14 is a partial enlarged vertical cross-sectional view of a bracket-mounted portion of the inflator in the occupant protection device of FIG. 13. 14A and 14B are enlarged partial cross-sectional views showing the vicinity of the inflator arrangement portion in the occupant protection device of FIG. 13, showing a state before sliding (when mounted on the vehicle) and a state after sliding.

An embodiment of the present invention will now be described with reference to the drawings. As shown in Figures 1 to 5, the occupant protection device S of this embodiment is mounted on a vehicle seat 1 and includes a seat belt 7 that forms a retaining belt portion that holds an airbag 45, the airbag 45, an inflator 20 that supplies inflation gas to the airbag 45, and a slide mechanism 35 that slides the inflator 20 (inflator main body 21 and connecting pipe portion 25) relative to a seat frame 4 (described below).

Seat 1 has a backrest 2 and a seat 3, and is supported by a seat frame 4. In this embodiment, the vehicle in which seat 1 is installed is a right-hand drive vehicle (details not shown), and seat 1 is the passenger seat. That is, seat 1 is installed in the vehicle with the right side positioned in the center of the vehicle width and the left side positioned on the outside of the vehicle width.

In this embodiment, the seat belt 7 is mounted on the seat 1 and includes a belt body 8 for protecting an occupant MP seated in the seat 1, a tongue plate 12 attached to the belt body 8, and a buckle 13 for connecting the tongue plate 12. One end of the belt body 8 is secured to a winding shaft of a retractor (not shown) located within the backrest 2, and the other end is secured to an anchor member 14 (see Figures 1 and 2) located to the left of the rear end 3a of the seat cushion 3 of the seat 1. Specifically, the belt body 8 is positioned so that it is exposed to the outside from the upper left edge of the backrest 2. In this embodiment, when the occupant MP is not seated, the lap belt 10, which serves as a retaining belt for retaining the airbag 45, is exposed to the front of the backrest 2, as shown in Figures 1 and 2. 1, when the occupant MP is not seated, the lap belt 10 is exposed at the front of the backrest 2 at the left edge 2a of the backrest 2, extending generally along the vertical direction. The belt main body 8 includes the lap belt 10 and a shoulder belt 9 stored in the backrest 2. When the occupant MP is seated, with the tongue plate 12 connected to the buckle 13, the lap belt 10, which is positioned generally along the horizontal direction between the anchor member 14 and the buckle 13, restrains the lower body MD (lumbar region MW) of the occupant MP, and the shoulder belt 9, which extends from the upper left edge of the backrest 2 and is positioned diagonally to the buckle 13, restrains the upper body MU (from the shoulders MS to the chest MB) of the occupant MP (see FIG. 4). In this embodiment, when an occupant MP is seated in the seat 1, the lap belt 10, which is placed in front of the waist MW of the occupant MP, forms a retaining belt portion that stores and holds the folded airbag 45, and the airbag 45 is held by the lap belt 10 with its folded periphery covered by a cover 60. In the seat belt 7, a retractor (not shown) located in the backrest 2 has a pretensioner mechanism.

As shown in Figures 4 and 5, the inflator 20, which supplies inflation gas to the airbag 45, includes an inflator body 21 and a connecting pipe 25 extending from the inflator body 21 and connecting the inflator body 21 to the airbag 45.

The inflator body 21 has a generally cylindrical outer shape and is disposed in the lower rear area of the seat cushion 3 of the seat 1, with its axial direction aligned generally along the left-right direction, as shown in FIG. 5. The inflator body 21 is configured with a gas discharge port 22 capable of discharging inflation gas disposed at one axial end. In this embodiment, the inflator body 21 is attached to a slide mechanism 35 disposed on the rear surface of the seat frame 4, which is the lower part of the seat cushion 3, using a bracket 30 disposed on the outer periphery, with the end of the gas discharge port 22 facing left (outward in the vehicle width direction). More specifically, the inflator body 21 is disposed in approximately the left half of the rear surface of the seat frame 4, with the gas discharge port 22 disposed at the left end 21a approximately aligned with the left end of the seat frame 4 (see FIG. 5). A connector 23, to which a lead wire 23a is connected, is connected to the other axial end (right end 21b) of the inflator body 21. Specifically, the inflator body 21 is configured to be attached to a sliding plate portion 36, which serves as a sliding member constituting the slide mechanism 35. The bracket 30 for attaching the inflator body 21 to the sliding plate portion 36, which serves as a sliding member, includes a retaining ring portion 30a having a generally annular outer shape capable of holding the inflator body 21, and a bolt 30b protruding from the retaining ring portion 30a. The retaining ring portion 30a is configured to hold the inflator body 21 by being crimped to reduce its diameter (see FIG. 7). The brackets 30 are disposed at two locations spaced apart along the axial direction of the inflator body 21. The inflator body 21 is held by the retaining ring portion 30a, and the bolt 30b protruding from the retaining ring portion 30a is inserted into a mounting hole 36a formed in the sliding plate portion 36 and secured with a nut 31, thereby attaching the inflator body 21 to the sliding plate portion 36 (see FIGS. 6 and 7). In this embodiment, the inflator body 21 is set to start operating later than the pretensioner mechanism of the seat belt 7 in order to restrict the pulling out of the belt body 8 of the seat belt 7 due to the inflation of the airbag 45. Also, in this embodiment, the inflator body 21 is configured to activate when an impact force acts from the front and side (left side) with the seat 1 positioned so that it faces the front of the vehicle.

The connecting pipe 25 connecting the inflator body 21 and the airbag 45 is made of a metal pipe such as steel. It extends and bends from the inflator body 21 and is located to the side (left, i.e., outward in the vehicle width direction) of the seat 3 (specifically, to the left (outward in the vehicle width direction) of the seat frame 4 located below the seat 3). In this embodiment, the connecting pipe 25 extends and bends from the left end 21a (gas discharge portion 22) of the inflator body 21 and is located to the left of the seat frame 4 (the outer region of the seat frame 4 in the vehicle width direction). It has a base side portion 26 on the inflator body 21 side and a tip side portion 27 that intersects with the base side portion 26, giving it a generally L-shaped exterior. More specifically, the tip end portion 27 of the connecting pipe portion 25 is positioned in a lateral (left) area of the seat frame 4 below the seat cushion 3 (see Figures 3 and 8). While detailed description of the connecting pipe portion 25 is omitted, the base end 26a of the base end portion 26 is connected to the gas discharge portion 22 of the inflator body 21 by crimping. The tip end 27a of the tip end portion 27 of the connecting pipe portion 25 is also connected to the tip end 55a of the conduit portion 55 (described later) of the airbag 45 using a clamp 33.

The slide mechanism 35 that attaches the inflator body 21 to the seat frame 4 includes a slide plate 36 to which the inflator body 21 is attached, and slide rails 38U and 38D that are disposed on the seat frame 4 and slideably support the slide plate 36. The slide plate 36 is generally rectangular and wider in both the left and right directions than the inflator body 21. The slide plate 36 constitutes a slide member that is slidably supported on the seat frame 4. The slide plate 36 has two mounting holes 36a on the left and right sides through which the bolts 30b of the bracket 30 that hold the inflator body 21 are inserted. In this embodiment, the inflator body 21 is attached to the slide plate 36 by inserting the bolts 30b into the mounting holes 36a and fastening them with nuts 31 (see Figures 7 and 8). The slide rail portions 38U, 38D are fixed to the rear side of the seat frame 4, and are elongated with a generally U-shaped (or inverted U-shaped) cross section that extends generally along the left-right direction so that the upper and lower ends of the slide plate portion 36 can be inserted therein and held slidably in the left-right direction (see FIGS. 7 and 8 ). In this embodiment, the upper and lower edges of the right end of the slide plate portion 36, which is the leading end in the movement direction, are temporarily fixed to the slide rail portions 38U, 38D by shear pins 40 (see FIG. 6 ). 7 and 8A, the shear pin 40 is disposed to penetrate the slide rail portions 38U, 38D and the slide plate portion 36, and has a strength set so that it will shear and release the temporary fixed state when a predetermined or greater pressing force is applied from the left to the connecting pipe portion 25 (tip end portion 27). After the shear pin 40 shears, the slide plate portion 36 will slide to the right relative to the slide rail portions 38U, 38D (see B in FIG. 8). In other words, the inflator 20 (inflator body 21) will slide to the right together with the connecting pipe portion 25 relative to the seat frame 4. The shear strength of the shear pin 40 is set so that it will shear when it comes into contact with the connecting pipe portion 25 of an oncoming vehicle during a side collision. In this embodiment, an opening 4a is formed in the seat frame 4 in the area where the inflator body 21 moves to prevent contact with the bolt 30b and nut 31 that attach the inflator body 21 to the slide plate portion 36 (see Figures 6 to 8).

In this embodiment, the inflator 20 is attached to the seat frame 4 via the slide mechanism 35 so that there is a gap between the connecting pipe portion 25 and the seat frame 4 (specifically, between the tip portion 27 and the left side surface of the seat frame 4) when installed in the vehicle. The gap H (see Figure 6; the travel stroke of the inflator body 21 after the shear pin 40 is sheared) between the connecting pipe portion 25 (tip portion 27) and the seat frame 4 when installed in the vehicle is set to approximately 30 mm in this embodiment.

The airbag 45 is held by the lap belt 10 of the seat belt 7 as a retaining belt portion, folded into a long shape, and covered with a cover 60. Specifically, when the seat belt 7 is fastened, the airbag 45 is placed in the area of the lap belt 10, covered with the cover 60, and placed on top of the lap belt 10 (see FIG. 4). In other words, the airbag 45 is folded and stored in the gap between the lap belt 10 and the cover 60. In addition, when the airbag 45 is not fastened as shown in FIG. 1, the airbag 45 is placed on the back side (backrest 2 side) of the lap belt 10, which is exposed at the front of the backrest 2. The cover 60 is made of a flexible sheet and is configured to break at a predetermined location when the airbag 45 is deployed and inflated, allowing the bag body 46 (described later) of the airbag 45 to protrude.

As shown in Figures 9 and 10, the airbag 45 includes a bag body 46 that inflates to protect the occupant MP, a conduit portion 55 that is connected to the inflator 20 and allows inflation gas to flow into the bag body 46, and an attachment portion 57 that secures the bag body 46 to the lap belt 10.

The bag body 46 has an external shape upon full inflation that is a generally triangular prism with its axis aligned generally in the left-right direction. When viewed from the left or right side, the fully inflated shape is a generally right-angled triangle with its hypotenuse at the front, and when viewed from the front-rear direction, the fully inflated shape is a generally rectangular shape with its width increased vertically (see Figures 11 and 12). As shown in Figures 9 and 10, the bag body 46 has a rear wall 48 positioned on the occupant MP side (rear side) upon full inflation, a front wall 47 positioned opposite the rear wall 48 in the front-rear direction, a bottom wall 49 positioned at the bottom end upon full inflation, and left and right wall portions 50 and 51 positioned opposite each other in the left-right direction upon full inflation. Upon full inflation, the bag body 46 receives the upper body MU of the occupant MP with the rear wall 48. When the upper body MU is received by the rear wall 48, the lower wall 49 abuts against and supports the thighs MT of the occupant MP, thereby protecting the occupant MP (see FIG. 12 ). The bag body 46 has a conduit 55 located on the underside of the rear end 49a of the lower wall 49, through which inflation gas from the inflator 20 (inflator body 21) flows into the bag body 46. In the area of the rear end 49a of the lower wall 49, two circular communication holes 53 communicating with the conduits 55 are provided side by side on the left and right sides in this embodiment. The bag body 46 is connected to the conduits 55 around the periphery of the communication holes 53.

The conduit 55 extends leftward from the bag body 46 and is generally cylindrical with an open tip 55a. The conduit 55 is connected to the connecting pipe 25. When the airbag 45 is fully inflated, the conduit 55 is positioned generally along the left-right direction so as to generally follow the lap belt 10 (see FIGS. 11 and 12). The tip 55a of the conduit 55 is connected to the tip 27a of the connecting pipe 25 using the clamp 33, as described above. The attachment portion 57, which attaches the bag body 46 to the lap belt 10, is sewn to the underside of the conduit 55, as shown in FIG. 9. The attachment portion 57 is generally cylindrical with open ends so that the lap belt 10 can be inserted therethrough. By inserting the lap belt 10 through the attachment portion 57, the airbag 45 is connected to the lap belt 10 and is held by the lap belt 10.

In the occupant protection device S of this embodiment, when an occupant MP is seated in a vehicle seat 1 wearing a seat belt 7, and the inflator 20 is activated, inflation gas is discharged from the inflator body 21 and flows into the bag body 46 via the connecting pipe portion 25 and the conduit portion 55. The bag body 46 of the airbag 45 then ruptures the cover 60, protruding forward and upward from the lap belt 10 serving as the retaining belt portion, and completes inflation as shown in Figures 11 and 12.

In the occupant protection device S of this embodiment, the inflator 20 has a connecting pipe portion 25 connecting the inflator main body 21 and the airbag 45 that is bent while extending from the inflator main body 21 and positioned in a lateral (left) area of the seat 3 (specifically, in a left area of the seat frame 4). However, the inflator main body 21 is slidable together with the connecting pipe portion 25 relative to the seat frame 4. Therefore, even if an external force F acts on the seat 3 from the left or right side (the left in this embodiment), such as when entering the vehicle from the side, and this external force F acts to press on the connecting pipe portion 25 (specifically, the tip end portion 27), the connecting pipe portion 25 can be slid along with the inflator main body 21 relative to the seat frame 4 (see Figures 8A and 8B), thereby preventing the connecting pipe portion 25 from instantly deforming when subjected to the external force F. Additionally, by sliding the inflator body 21 relative to the seat frame 4, the compressive force acting on the connecting pipe 25 can be absorbed to some extent. In other words, in the passenger protection device S of this embodiment, the sliding movement of the inflator 20 relative to the seat frame 4 and the energy absorption that accompanies this sliding movement can delay the start of deformation of the connecting pipe 25 when an external force acts from the side. This allows the inflation gas discharged from the inflator body 21 to flow into the airbag 45 via the connecting pipe 25 before the connecting pipe 25 deforms, allowing the airbag 45 to inflate smoothly.

Therefore, with the occupant protection device S of this embodiment, the airbag 45 can be smoothly inflated even when a side impact force is applied.

Specifically, in the occupant protection device S of this embodiment, the inflator body 21 is attached to a slide plate 36, which serves as a slide member slidably supported relative to the seat frame 4. The slide plate 36 is mounted on the vehicle while temporarily fixed to slide rails 38U and 38D located on the seat frame 4 by a shear pin 40. When an external force F is applied, the shear pin 40 is sheared by the force, causing the slide plate 36 to slide relative to the slide rails 38U and 38D. Therefore, in the occupant protection device S of this embodiment, when mounted on the vehicle prior to the application of the external force F, rightward movement of the inflator 20 (the inflator body 21 and the connecting pipe 25) can be appropriately suppressed, ensuring a sufficient stroke of movement of the inflator 20 toward the seat frame 4. Furthermore, when the external force F is applied, the shear pin 40 is sheared, thereby absorbing the energy of the pressing force acting on the connecting pipe 25.

The inflator 20 may be mounted to the seat frame 4A (slide mechanism 65) in the manner shown in Figures 13 to 15. In the mounting manners shown in Figures 13 to 15, the inflator 20 is mounted directly to the seat frame 4A. The seat frame 4A is formed with mounting holes 4b through which the bolts 30b of the inflator 20 can be inserted. These mounting holes 4b are elongated and extend approximately along the left-right direction, allowing the bolts 30b to move left-right within the mounting holes (see Figure 13). When mounted in the vehicle, the inflator 20 is mounted to the seat frame 4A with each bolt 30b positioned on the left edge of the mounting hole 4b. When an external force F is applied, the inflator body 21 itself moves the bolts 30b within the mounting holes 4b, sliding rightward relative to the seat frame 4A (see Figures 15A and 15B). That is, the mounting holes 4b formed in the seat frame 4A themselves constitute a slide mechanism 65 that allows the inflator 20 (inflator body 21 and connecting pipe 25) to slide relative to the seat frame 4A. The length L (see FIG. 13) of each mounting hole 4b is set to be equal to or larger than the gap (the movement stroke of the inflator body 21) between the connecting pipe 25 and the seat frame 4A when the inflator 20 is mounted in the vehicle, and is set to about 30 mm in this embodiment. Note that, because the bolts 30b inserted into the mounting holes 4b are secured with nuts 31, the inflator 20 will not move with a light force (e.g., a force exerted by a hand or foot) when mounted in the vehicle. However, similar to the slide mechanism 35 described above, the inflator 20 will move when an external force F is applied, such as when a vehicle enters the vehicle. With this configuration, even when the inflator 20 is attached to the seat frame 4A, when an external force F acts on the seat cushion 3 from either the left or right side (from the left in this embodiment), such as when someone enters the vehicle from the side, the external force F causes the connecting pipe 25 to slide relative to the seat frame 4A together with the inflator body 21, thereby preventing the connecting pipe 25 from being instantly deformed by the external force F. Furthermore, at this time, the bolts 30b attaching the inflator body 21 to the seat frame 4A slide within the mounting holes 4b, and this sliding movement also serves to absorb the energy of the pressing force acting on the connecting pipe 25. Therefore, even with the above configuration, the sliding movement of the inflator 20 relative to the seat frame 4A and the energy absorption that accompanies this sliding movement can delay the start of deformation of the connecting pipe portion 25 when an external force acts from the side. This allows the inflation gas discharged from the inflator body 21 to flow into the airbag 45 via the connecting pipe portion 25 before the connecting pipe portion 25 deforms, allowing the airbag 45 to inflate smoothly.

In the occupant protection device S of the embodiment, the lap belt 10 of the seat belt 7 is used as the retaining belt portion that holds the airbag 45. However, the retaining belt portion that holds the airbag is not limited to a lap belt. For example, a belt separate from the seat belt may be placed in front of the occupant's waist while seated in the seat, and the airbag may be held by this belt. Furthermore, in the occupant protection device S of the embodiment, although the airbag 45 is held by the lap belt 10 of the seat belt 7, the inflator 20 operates with a delay relative to the activation of the pretensioner mechanism of the seat belt 7. Therefore, the airbag 45 can be inflated while the occupant MP is stably maintained seated in the seat 1 by the seat belt 7, and the airbag 45 and the seat belt 7 provide stable protection for the occupant MP.

In addition, in the occupant protection device S of this embodiment, the seat belt 7 and inflator 20 are mounted on the seat 1. Therefore, even when the seat 1 is used in a state where it is moved relative to the vehicle by sliding or rotating it significantly forward and backward, the occupant MP seated in the seat 1 can be adequately protected by the airbag 45.

1...seat, 3...seat portion, 4, 4A...seat frame, 4b...mounting hole, 20...inflator, 21...inflator body, 25...connecting pipe portion, 30...bracket, 30b...bolt, 31...nut, 35...slide mechanism, 36...slide plate portion (slide member), 38U, 38D...slide rail portion, 45...airbag, 65...slide mechanism, MP...occupant, S...occupant protection device.

Claims (2)

It is configured to protect the occupant seated in the seat,
an airbag configured to be inflatable in a bag shape so as to cover the front of the occupant and to be held in a folded state by a holding belt portion that is wrapped around the waist of the occupant;
an inflator that supplies inflation gas to the airbag;
An occupant protection device having a configuration comprising:
The inflator is
an inflator body having a generally cylindrical shape and attached to a lower rear surface of the seat portion of the seat with its axial direction generally aligned with the left-right direction;
a connecting pipe portion that is bent while extending from the inflator body and is disposed in a region to the side of the seat portion, and that connects the inflator body and the airbag;
The device is configured to include:
the inflator body is attached to a slide mechanism provided on a seat frame, and is attached to the seat frame side so as to be slidable together with the connecting pipe portion relative to the seat frame when a pressing force acts on the connecting pipe portion when an external force acts on the seat portion from the left or right side ,
The slide mechanism is
a slide plate portion for mounting the inflator body;
a slide rail portion disposed on the seat frame side, into which an upper end side and a lower end side of the slide plate portion are inserted, for holding the slide plate portion slidably in the left-right direction;
Equipped with
An occupant protection device, wherein an opening is formed in the seat frame in a region where the inflator body moves . The slide plate portion is temporarily fixed to the slide rail portion by a shear pin,
2. The passenger protection device according to claim 1, wherein the shear pin is configured to release the temporary fixed state when subjected to the pressing force.