JP2019108121A - Occupant protection device - Google Patents

Abstract

To provide an occupant protection device that, in the event of impact applied to a vehicle from the rear, is able to prevent the head of an occupant from coming into contact with a member composing an occupant cabin.SOLUTION: In the event of impact applied to a vehicle, an occupant protection device 1 is able to protect an occupant C seated in a seat 110. The occupant protection device 1 comprises: a belt member 2 stretched across a shoulder part 119 of the backrest 112 of the seat 110; and a retractor 3 provided on a rear surface part of the backrest 112, holding one-end side of the belt member 2, and capable of pulling the belt member 2. The back rest 112 has a recess 41 in which a contact part 120 of the shoulder part 119 with the belt member 2 is deformable downward when the belt member 2 is pulled.SELECTED DRAWING: Figure 4

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occupant protection device, and more particularly to an occupant protection device capable of preventing a head of an occupant from contacting a member constituting an occupant compartment when a vehicle receives an impact from behind.

As a device for protecting an occupant moving backward by an inertial force caused by a collision, the first expansion portion and the second expansion portion prevent the occupant's head from moving in the front-rear direction as a device for protecting the occupant moving backward due to the collision. There is known an air bag apparatus provided with an air bag to be restrained (see Patent Document 1).
Such an air bag device has a protection form in which the air bag is deployed and received before the occupant moves due to a collision.

JP, 2008-189023, A

  However, if it is decided to receive the occupant at the end of the movement as in the conventional occupant protection device, the occupant's head and neck receive an inertial force caused by the magnitude of the impact, the weight of the occupant, etc. . This could be one of the causes of increased injury values to the head and neck, especially to the neck.

  Therefore, the problem to be solved by the present invention is to provide an occupant protection device capable of preventing the head of the occupant from coming into contact with a member constituting the occupant compartment when the vehicle receives an impact.

  As a means for solving the above problems, an occupant protection device according to the present invention is an occupant protection device capable of protecting an occupant seated in a seat when an impact is applied to the vehicle. And a holding member provided on the rear surface of the backrest for holding one end of the seat belt and capable of pulling the seat belt, the backrest being the seat belt When the toe is pulled, the contact portion of the shoulder portion with the seat belt has a deformable portion which can be deformed downward to such a position that it is below the shoulder of the seated occupant, and the holding member is It is provided below the lower end of the fragile portion.

  In the occupant protection device according to the present invention, preferably, the fragile portion can be inclined and deformed downward or inward in the width direction of the seat.

  In the occupant protection device according to the present invention, preferably, the fragile portion has a recess formed by being deformed downward from an upper end extending in the width direction of the seat in the seat frame disposed in the backrest.

  Further, in the occupant protection device according to the present invention, the upper end portion of the seat frame disposed in the backrest is lowered and formed, and the fragile portion is a contact portion between the shoulder portion of the backrest and the seat belt in the backrest. It is preferable to have a soft member disposed from the inside of the seat frame to the top of the upper end of the seat frame.

  According to the present invention, when the vehicle is subjected to an impact caused by a collision, when the seat belt is pulled by the holding member, the seat restraint against the seat belt at the shoulder portion is enhanced while the restraint force of the occupant is increased. The belt deforms the fragile part downward and bites it. As a result, sufficient restraint of the occupant's shoulders and chest is achieved, and therefore occupant protection that can prevent the occupant's head from coming into direct contact with any member, such as a rear gate, rear glass, ceiling or collision object. An apparatus can be provided.

FIG. 1A and FIG. 1B are schematic views showing a form of a rear impact on a conventional vehicle. FIGS. 2 (a) and 2 (b) are schematic views showing one collision from the rear with respect to a conventional vehicle. FIG. 3 is a schematic view showing a form of a rear impact on a conventional vehicle. FIG. 4 is a schematic view showing an occupant protection device according to an embodiment of the present invention, FIG. 4 (a) is a schematic front view showing an upper portion of a seat provided with the occupant protection device, and FIG. 4 (b) is an occupant FIG. 5 is a schematic side view of the side of a seat with a protection device. FIG. 5 is a schematic view showing one driving mode of the occupant protection device shown in FIG. FIG. 6 is a schematic view showing an occupant protection device according to another embodiment of the present invention, and FIG. 6 (a) is a schematic front view showing an upper portion of a seat provided with an occupant protection device according to a modification. (B) is front schematic which shows one drive form of the passenger protection device shown to Fig.6 (a).

(Conventional rear end form)
First, the case where a conventional vehicle collides from behind will be described with reference to FIGS. 1 to 3.
1 to 3 are schematic views showing one collision from the rear with respect to a conventional vehicle.

  A vehicle 100 shown in FIG. 1A is provided with a seat 110, and an occupant C is seated on the seat 110.

  Vehicle 100 has a ceiling portion 101, a rear gate 102, a floor portion 103, and wheels 104 at the rear portion. The ceiling portion 101 is a member, such as a roof panel, extending in the front-rear direction and the width direction of the vehicle 100, and is a member constituting an upper surface portion of the passenger compartment. The rear gate 102 is a door member that opens and closes a luggage compartment formed in a part of the rear side of the passenger compartment, and is a member that constitutes the rear surface part of the passenger compartment. The floor portion 103 is a member extending in the front-rear direction and the width direction of the vehicle 100 in which the seat 110 is disposed at the upper portion, and is a member constituting the lower surface portion of the passenger compartment. The wheel 104 is a member for moving the vehicle 100 forward and backward, which rolls on the road surface by transmitting a driving force from a driving source such as an engine and rotating.

  The seat 110 also includes a seat portion 111, a backrest 112, a headrest 113, and a seat belt device 114.

  The seat portion 111 is a portion on which the occupant C is seated, and is fixed to the floor portion 103.

  The backrest 112 is a portion where the occupant C can lean on by bringing the rear surface into contact. The seat portion 111 and the backrest 112 are connected via a connecting member such as a rotatable shaft that can be fixed to realize the reclining function.

  The headrest 113 is a portion where the head of the occupant C can be stabilized by bringing the occupant C into contact with the back of the head. The backrest 112 and the headrest 113 are connected via an expandable shaft 115. The shaft body 115 is insertable into and removable from an opening formed in a shoulder which is an upper end surface portion of the backrest 112.

  The seat belt device 114 is means for restraining the occupant C in a sitting posture. The seat belt device 114 includes a belt member 116, a retractor 117, and an anchor member 118. The belt member 116 is a belt-like member mounted in close contact with the occupant C when no abnormality such as a collision occurs. The retractor 117 is a member attached to the rear surface of the backrest 112 to fix one end of the belt member 116 and to be able to wind the excess belt member 116. As shown in FIG. 1, the belt member 116 pulled out of the retractor 117 extends from the back side of the backrest 112 via the shoulder 119 to the anchor member 118. The anchor member 118 is attached to the side of the seat portion 111 and is a member for fixing the other end of the belt member 116.

  The vehicle 100 illustrated in FIGS. 1 to 3 is a vehicle in which the seats 110 are provided in three rows along the front-rear direction of the vehicle 100, for example, a minivan or the like. The seat 110 is a rear seat disposed close to the rear gate 102 in a passenger compartment such as a minivan.

  When a collision from the rear occurs with respect to the vehicle 100 in the initial state shown in FIG. 1A, the seat 110 and the occupant C in the passenger compartment of the vehicle 100 are first in the state shown in FIG. Note that black arrows shown in the rear of the rear gate 102 in FIG. 1 (b), FIG. 2 and FIG. 3 indicate the load input by the collision.

  When a collision from the rear with respect to the vehicle 100 occurs, as shown in FIG. 1B, the occupant C is pressed against the backrest 112 by the inertial force caused by the collision. Due to the collision, a load to the rear, which is a combination of the load on which the occupant C is pressed and the load due to the inertial force caused by the own weight of the backrest 112 itself, acts on the backrest 112.

  In the state shown in FIG. 1 (b), the back surface of the occupant C sinks into the backrest 112. At this time, the seat belt device 114 maintains the state where no collision occurs in the vehicle 100 shown in FIG. 1A, so the space between the shoulder, chest and waist of the occupant C and the belt member 116 is maintained. There is a gap. That is, from the state in which the occupant C and the belt member 116 are in close contact with each other before the collision shown in FIG. 1A, the collision occurs and the occupant C moves rearward to release the close contact state. Will occur. Thus, the restraint force of the occupant C by the seat belt device 114 may be slightly reduced when a collision occurs.

If the load acting on the backrest 112 is large, the seat 110 and the occupant C will be in the state shown in FIG. 2 (a) from the state shown in FIG. 1 (b).
Specifically, due to the rearward load acting on the backrest 112, a part of the connecting member between the seat portion 111 and the backrest 112 is broken. The breakage of the connection member makes it difficult to maintain the initial position of the backrest 112 shown in FIGS. 1 (a) and 1 (b). Even if the connecting member breaks, the occupant C continues to be subjected to inertial force so as to be further pressed against the backrest 112. As a result, as shown in FIG. 2A, the occupant C falls back together with the backrest 112.
The gap formed between the occupant C and the belt member 116 when a collision occurs remains in the state shown in FIG. 2A.

If the load acting on the backrest 112 is large, the seat 110 and the occupant C will be in the state shown in FIG. 2 (b) from the state shown in FIG. 2 (a).
Specifically, when the occupant C continues to be pressed against the seat 110, the attachment portion of the shaft body 115 connecting the backrest 112 and the headrest 113 is deformed. As a result, as shown in FIG. 2B, the backrest 112 falls backward, and the headrest 113 also begins to fall backward. When the headrest 113 falls back, the headrest 113 abuts on the rear gate 102. Note that the contact of the headrest 113 with the rear gate 102 also includes a form in which the headrest is in contact with a rear glass for rear view provided on the rear gate 102. When the headrest 113 abuts on the rear gate 102, the operation of the backrest 112 and the occupant C falling backward stops.
The gap formed between the occupant C and the belt member 116 when a collision occurs remains in the state shown in FIG. 2 (b) from the state shown in FIG. 2 (a).

If the load acting on the backrest 112 is large, the occupant C will be in the state shown in FIG. 3 from the state shown in FIG. 2 (b).
Specifically, even if the backrest 112, the headrest 113 and the occupant C's tilting operation to the rear is stopped due to the abutment between the headrest 113 and the rear gate 102, the occupant C continues to receive the inertia force to the rear. As a result, the occupant C moves upward along the inclined backrest 112 so as to rise upward. When the occupant C moves upward and rearward, the head of the occupant C abuts on the rear gate 102.
When the relative velocity of the collision object colliding with the vehicle 100 is high, the collision object may push the rear gate 102 shown in FIG. 3 forward toward the passenger compartment. As a result, there is also a possibility that the head of the occupant C who has moved to the rear upper side abuts on the collision object. As a result, not only does the injury value of the head of the occupant C increase, but the head is pressed against the rear gate 102 by the inertial force that the occupant C receives, so that a large load is exerted on the neck supporting the head. As a result, the neck injury value of the occupant C also increases.

  Usually, a mechanism for locking the rapid withdrawal of the belt member 116 is incorporated in the retractor 117 or the like. When the occupant C moves upward and rearward as shown in FIG. 3, the shoulder of the occupant C pulls on the belt member 116, thereby causing a rapid withdrawal of the belt member 116. However, since the belt member 116 is left by the gap generated between the occupant C and the belt member 116 shown in FIG. 1B, the movement of the occupant C to the rear upper side is slightly advanced. After that, rapid withdrawal of the belt member 116 may begin to occur. Therefore, when the gap between the occupant C and the belt member 116 is large, the function of locking the rapid withdrawal of the belt member 116 may not be exerted until immediately before the head of the occupant C abuts on the rear gate 102. was there.

  As described above, as shown in FIGS. 1 to 3, when a collision occurs from behind with respect to the conventional vehicle 100, the occupant C moves to the rear to lift the occupant C to the rear gate 102. It was in contact from the part.

  In the present embodiment, even if the attachment portion of the shaft body 115 supporting the headrest 113 does not deform at the shoulder portion of the backrest 112, the headrest relative to the rear gate 102 if the backrest 112 itself continues to fall. 113 will abut.

(Overview of Basic Embodiment)
Subsequently, an occupant protection device 1 according to an embodiment of the present invention will be described with reference to FIG.
4 (a) is a schematic view showing an occupant protection device according to an embodiment of the present invention, and FIG. 4 (a) is a schematic front view showing an upper portion of a seat provided with the occupant protection device, FIG. 4 (b) Figure 2 is a side schematic view of the side of the seat with the occupant protection device. The vehicle 100 and the seat 110 in FIG. 4 use the same members as those shown in FIG. 1 to FIG.

  As shown in FIG. 4, the occupant protection device 1 includes a belt member 2, a retractor 3, and a seat frame 4 having a recess 41.

The belt member 2 is a belt-like member which abuts on the occupant and restrains the occupant, and one end thereof is held by the retractor 3 described later, and the other end is an anchor member 118 as shown in FIGS. It is fixed to The anchor member 118 described above is a member for fixing the belt member 2 and is usually fixedly disposed on the side portion or floor portion 103 of the seat portion 111 of the seat 110. The belt member 2 is inserted into a detachable tongue plate between a retractor 3 and an anchor member 118 and a buckle which is fixedly disposed on the opposite side to the anchor member 118 in the lateral direction. The tongue plate and the buckle (both not shown) are members for guiding the belt member 2.
As shown in FIG. 4 (b), in the present embodiment, the belt member 2 is back-mounted between one end side held by the retractor 3 and the front side of the backrest 112 fixed to the anchor member 118. It is stretched over the shoulder 119 of the rest 112. A contact portion of the shoulder portion 119 with the belt member 2 is referred to as a contact portion 120.

  The retractor 3 is a member that holds one end of the belt member 2 in a fixed manner, and is capable of winding and unwinding the belt member 21. In general, the retractor 3 winds up and stores the excess belt member 2 not used for restraining the occupant C. The retractor 3 in the present embodiment is mounted by an appropriate fixing member so that its position does not change with respect to the rear surface portion of the backrest 112 before and after the collision.

The retractor 3 has a function of forcibly winding the belt member 2 when a collision occurs. In the present embodiment, as a power source of the winding operation of the belt member 2 at the time of a collision by the retractor 3, a gas generation unit 5 fixedly attached to a seat frame 4 described later is used.
The gas generation means 5 is a member that generates high-pressure gas for the operation of winding the belt member 2 by the retractor 3 when the occupant protection device 1 is driven. As the gas generation means 5, specifically, explosives used for an inflator of an air bag or the like, or a gas cylinder filled with high pressure gas can be used.

  In the embodiment shown in FIG. 4, the retractor 3 is disposed lower than the embodiment shown in FIGS. 1 to 3, but the upper and lower positions of the retractor 3 are particularly limited as long as the object of the present invention can be achieved. I will not.

The seat frame 4 is a rod-like or cylindrical member disposed inside the backrest 112 so that the shape of the backrest 112 can be maintained when the occupant C leans on the backrest 112 or the like. The seat frame 4 is a width frame portion extending across and connecting the upper end portions of the upper and lower frame portions 42 in the width direction of the seat 110, the upper and lower frame portions 42 extending vertically on both sides in the width direction of the seat 110 And 43.
As shown in FIG. 4A, in a part of the width frame portion 43 which is the upper end portion of the seat frame 4, a concave portion 41 which is bent and deformed so as to be depressed downward is formed.

  The concave portion 41 is a concave portion protruding downward from a part of the width frame portion 43. The recess 41 has a belt receiving portion 44 at the lower end. The belt receiving portion 44 is a portion where the belt member 2 is hooked directly or indirectly when the occupant protection device 1 described later is driven.

The position where the concave portion 41 is formed is a portion of the width frame portion 43 and a position corresponding to the lower side of the contact portion 120 of the shoulder portion 119 of the backrest 112 with the belt member 2.
The concave portion 41 is formed by bending and deforming a part of the width frame portion 43 downward. The recess 41 is formed to be inclined toward the inside in the width direction of the seat 110, and depending on the seat to which the present invention is applied, the direction in which the belt member 2 is stretched may be reversed horizontally. The direction of inclination may be reversed to be directed inward in the width direction of the seat 110. Of course, the concave portion 41 may be formed in a curved shape, for example, may be curved and deformed.
The size of the recess 41, particularly the size in the width direction of the seat 110, is not particularly limited as long as the rigidity in the width direction of the seat frame 4 can be maintained, and in the present embodiment it is equivalent to the width of the belt member 2. It is set.

  In the seat frame 4, as shown particularly in FIG. 4B, the recess 41 is not parallel to the upper and lower frame portions 42, and is bent so that the belt receiving portion 44 is positioned rearward of the upper and lower frame portions 42. It is transformed. This is because, if the recess 41 is not bent and deformed, the recess 41 is recognized as an obstacle by the occupant C by coming into contact with the shoulder blade of the occupant C leaned on the backrest 112 and the vicinity thereof, It is because there may be a sense of discomfort in the comfort.

  The belt member 2 is an example of the seat belt in the present invention, the retractor 3 is an example of the holding member in the present invention, and the recess 41 is an example of the recess in the fragile portion of the present invention.

(Drive of the occupant protection device)
Here, the drive of the passenger protection device 1 described above will be described with reference to FIG.
FIG. 5 is a schematic view showing one driving mode of the occupant protection device shown in FIG.

  The occupant protection device 1 according to the present embodiment is driven in the state shown in FIG. 1B, that is, when the occupant C is pressed against the backrest 112 by an inertial force that the occupant C receives due to a collision. It is supposed to start. As the driving timing of the occupant protection device 1 according to the present embodiment, from the state shown in FIG. 1B, the state shown in FIG. 3, that is, the headrest 113 of the seat 110 abuts on the rear gate 102, and the occupant C is on the rear upper side And can be arbitrarily set before the state in which the head of the occupant C abuts on the rear gate 102.

First, when the occupant protection device 1 is driven in the present embodiment, the occupant C is in the state shown in FIG. 1B and is pressed against the backrest 112 and sunk by the occupant C and the belt member 2. There is a gap between them. That is, the restraining force of the occupant C by the belt member 2 is in a reduced state.
When a collision is detected by an acceleration sensor or the like appropriately provided in the vehicle, the gas generation means 5 is driven to generate high pressure gas. As a result, the belt member 2 is taken up by the high pressure gas via a mechanism employed in a conventional purine tensioner or the like.

  When the belt member 2 is taken up, the gap formed between the occupant C and the belt member 2 is reduced. Since the clearance disappears as the reduction of the clearance progresses, the belt member 2 adheres to the chest of the occupant C.

  Furthermore, winding of the belt member 2 proceeds. Thereby, the belt member 2 is pressed downward with respect to the contact portion 120 of the shoulder portion 119 with the belt member 2. The backrest 112 is filled with contents such as urethane foam as in the backrest of a seat used in a normal vehicle. When the belt member 2 is pressed against the contact portion 120, the belt member 2 bites downward with respect to the shoulder portion 119 while compressing the contents.

  By providing the recess 41 of the seat frame 4 below the contact portion 120, biting of the belt member 2 is not prevented. When the belt member 2 is fitted into the recess 41, it can bite below the width frame portion 43 which is the upper end portion of the seat frame 4.

  As shown in FIG. 5, when the belt member 2 is caught by the belt receiving portion 44 which is the lower end portion of the recess 41, the biting of the belt member 2 into the backrest 112 does not progress further. Here, the gas generation of the gas generation means 5 is stopped. As a result, when the winding operation of the belt member 2 by the retractor 3 is stopped, the operation to bite the belt member 2 into the backrest 112 is also stopped.

  When the belt member 2 bites downward from the shoulder portion 119 of the backrest 112, the skin member of the backrest 112 such as leather or synthetic resin fiber may be broken, depending on the elasticity due to the nature of the fiber It may be in a stretched state without breaking.

  Thus, the driving of the occupant protection device 1 is completed. When the occupant protection device 1 is driven, the restraint force of the occupant C by the belt member 2 which has been lowered due to the collision is increased to maintain the belt member 2 in a constant restraint state. Bite into Thereby, particularly as shown by the black arrows in FIG. 5B, in the state shown in FIG. 1B, the gap generated between the occupant C and the belt member 2 is almost eliminated.

  Further, by the belt member 2 being in a state of being caught by the belt receiving portion 44, the restraint state is such that the shoulder portion of the occupant C is passed over from below the height of the shoulder portion of the occupant C. Thus, the belt member 2 abuts not only on the shoulder upper end of the occupant C but also on a portion near the scapulae, and a restraining state in which the belt member 2 is further in close contact along the body of the occupant C is realized.

  Since the occupant protection device 1 according to the present embodiment particularly restrains the shoulders and the chest of the occupant C with a high restraint force, the vehicle 100 receives an impact from the rear, the rear upper side of the occupant C Movement can be prevented or reduced. Thus, the head of the occupant C can be prevented from coming into contact with the members constituting the occupant compartment.

  Furthermore, in the present embodiment, since the belt member 2 is stretched across the shoulder 119 of the backrest 112, not only the situation where a collision from the rear occurs but also the occupant C is caused by the vehicle 100 rolling over. Even in a situation where it is going to move up, down, left, and right, the shoulder portion of the occupant C can be reliably restrained by the belt member 2.

As shown in FIGS. 4 and 5, instead of the embodiment in which the occupant C is restrained by the winding operation of the belt member 2 of the retractor 3, attachment is appropriately performed using the same gas generation means 5 as the embodiment. The moving mechanism of the retractor 3 via a cylinder and a piston may be included. That is, the belt member 2 bites into the shoulder portion 119 of the backrest 112 by pulling the belt member 2 by moving the retractor 3 downward, for example, without forcibly winding the belt member 2 in the retractor 3. The occupant C can be restrained.
Alternatively, the belt member 2 may be wound by the retractor 3 while moving the retractor 3 downward.

  In the present embodiment, since the recess 41 is inclined inward in the width direction of the seat 110, as the biting into the shoulder 119 by the belt member 2 progresses, the contact of the belt 2 at the shoulder of the occupant C The contact position will approach the neck. By restraining the occupant C at a position close to the neck, the situation in which the shoulder of the occupant C falls off the belt member 2 can be suppressed.

  Also, when the recess 41 is inclined inward in the width direction, the optimum restraint position for the various occupants C having various shoulder widths and shoulder heights is the belt member 2 with the shoulder 119. It is likely to be found in the middle of the bite. Therefore, a suitable restraint state can be realized for all the occupants C having various sizes.

  Furthermore, when adopting a form in which the retractor 3 is moved, instead of the gas generating means 5, the retractor 3 may be moved by the biasing member. As such a form, for example, while providing a biasing member which is always maintained so that downward biasing force acts in a state where no collision occurs, the retractor 3 is fixed, and when a collision occurs, the retractor 3 The fixed state of may be released, and the retractor 3 may be moved downward by the biasing force of the biasing member.

(Modification)
Subsequently, a modification of the occupant protection system according to the present invention is shown in FIG.
FIG. 6 is a schematic view showing an occupant protection device according to another embodiment of the present invention, and FIG. 6 (a) is a schematic front view showing an upper portion of a seat provided with an occupant protection device according to a modification. FIG. 6 (b) is a schematic view showing one driving mode of the occupant protection device shown in FIG. 6 (a).
Since the seat shown in FIG. 6 uses the same members as those shown in FIGS. 4 and 5, the same reference numerals are attached.

  In the embodiment shown in FIG. 6, a soft member 6 is disposed instead of the recess 41. More specifically, in the occupant protection device 10 shown in FIG. 6, the upper and lower positions of the width frame portion 43 which is the upper end portion of the seat frame 4 are lowered to the upper and lower positions of the belt receiving portion 44 which was the lower end portion of the recess 41. It is formed. In addition, a columnar rigid member 7 is formed along the width direction of the seat 110 inside the shoulder portion 119 of the backrest 112 and its adjacent portion where the width frame portion 43 formed by lowering the height maintains the shape. Is arranged.

The soft member 6 is formed of a material that does not or hardly resists biting into the shoulder 119 of the backrest 112 of the belt member 2. The soft member 6 is disposed from the inside of the contact portion 120 to the upper portion of the width frame portion 43 in the backrest 112.
The hard member 7 is a member for maintaining the shape of the shoulder 119 or the like where the width frame portion 43 is not disposed, and is made of a material having a higher strength than the soft member 6. As a material of the hard member 7, for example, even if the rear face of the occupant C abuts on a portion where the hard member 7 is disposed, the seating posture can be easily maintained without a sense of discomfort without being too softer than the width frame portion 43 of the seat frame 4. Preferably it is a material.

  The pulling form of the belt member 2 in the occupant protection device 10 can adopt the winding of the belt member 2 by the gas generation means 5 and the retractor 3 in the occupant protection device 1. When the occupant protection device 10 is driven, the belt member 2 is wound and pulled on the rear surface portion of the backrest 112, and a load is applied to the shoulder portion 119 of the backrest 112 from the belt member 2. Thus, the belt member 2 starts to bite into the shoulder 119.

  In the embodiment shown in FIG. 6, by disposing the soft member 6 below the contact portion 120, biting of the belt member 2 is not prevented. The belt member 2 bites into the backrest 112 until it reaches the width frame portion 43 which is formed by lowering the upper and lower positions by causing the flexible member 6 to be deformed downward or compressed.

  As shown in FIG. 6, when the belt member 2 is caught by the belt receiving portion 44 which is a part of the width frame portion 43, the biting of the belt member 2 into the backrest 112 does not progress further.

  Thus, the driving of the occupant protection device 10 is completed. When the occupant protection device 10 is driven, the restraint force of the occupant C by the belt member 2 which has been lowered due to the collision is raised to maintain the belt member 2 in a constant restraint state. Bite into Thereby, in the state shown in FIG. 1B, the gap generated between the occupant C and the belt member 2 is almost eliminated.

  Further, by the belt member 2 being in a state of being caught by the belt receiving portion 44, the restraint state is such that the shoulder portion of the occupant C is passed over from below the height of the shoulder portion of the occupant C. Thus, the belt member 2 abuts not only on the shoulder upper end of the occupant C but also on a portion near the scapulae, and a restraining state in which the belt member 2 is further in close contact along the body of the occupant C is realized.

  Since the occupant protection device 10 according to the present embodiment particularly restrains the shoulders and the chest of the occupant C with a high restraint force, the vehicle 100 can receive an impact from the rear, the rear upper side of the occupant C. Movement can be prevented or reduced. Thus, the head of the occupant C can be prevented from coming into contact with the members constituting the occupant compartment.

In a normal vehicle, a shoulder anchor which is attached to a framework member such as a B-pillar, a C-pillar or a D-pillar and which is a relay member of the belt member 2 is not disposed in the embodiment shown in FIGS. This is because the shoulder anchors attached to the frame member can restrain the occupant C from the front to the rear, but the belt anchor 2 is placed on the shoulder portion 119 of the backrest 112 as a relay form of the belt member 2 This is because it is difficult to cause the belt member 2 to bite downward on the shoulder portion 119 because it is difficult to be.
When the shoulder anchor is arranged, the shoulder anchor is fixedly attached to the shoulder 119 of the backrest 112 or in the vicinity thereof, and when the belt member 2 is pulled, the belt 119 is attached to the shoulder 119 together with the shoulder anchor. Any form may be used as long as it cuts into it.

  Further, the holding member such as the above-mentioned retractor 3 may be disposed inside the rear surface portion of the backrest 112. Furthermore, in order to take a reaction force for causing the belt member 2 to bite into the backrest 112, it is possible to securely fix the retractor 3 and as a mounting position where mounting work is easy. The floor unit 103 may be used.

  Although the embodiment to which the invention made by the inventor has been applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, it is needless to say that it is needless to say that all other embodiments, examples, operation techniques and the like made by those skilled in the art based on this embodiment are included in the scope of the present invention.

1 and 10: passenger protection device, 2: belt member, 3: retractor, 4: seat frame, 41: recess, 42: upper and lower frame portions, 43: width frame portion, 44: belt receiving portion, 5: gas generating means, 6: Soft member, 7: Hard member, 100: Vehicle, 101: Ceiling, 102: Rear gate, 103: Floor, 104: Wheel, 110: Seat, 111: Seat, 112: Backrest, 113: Headrest, 114: Seat belt device, 115: Shaft, 116: Belt member, 117: Retractor, 118: Anchor member, 119: Shoulder, C: Passenger

Claims (4)

An occupant protection device capable of protecting an occupant seated in a seat when an impact is applied to a vehicle.
With a seat belt that is stretched over the shoulders of the seat backrest,
And a holding member provided on the rear surface of the backrest for holding one end of the seat belt and capable of pulling the seat belt,
The backrest has a fragile portion at which the contact portion with the seat belt in the shoulder portion can be deformed downward when the seat belt is pulled to such a position that the lower portion is lower than the shoulder portion of the seated occupant. And
The holding member is provided below the lower end of the fragile portion.
Occupant protection device. The fragile portion is deformable by being inclined downward or inward in the width direction of the seat.
The occupant protection device according to claim 1. The weak portion has a recess formed by being deformed downward from an upper end extending in the width direction of the seat in the seat frame disposed in the backrest.
The passenger protection device according to claim 1. Lowering and forming the upper end of the seat frame placed in the backrest,
The fragile portion has a soft member disposed in the backrest from the inside of the contact area between the backrest shoulder and the seat belt to the top of the upper end of the seat frame.
The passenger protection device according to claim 1.

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