JP6649654B2 - Occupant protection device - Google Patents

Description

  The present invention relates to an occupant protection device, and more particularly to an occupant protection device that can prevent a head of an occupant from coming into contact with members constituting an occupant compartment when a vehicle receives an impact from behind.

As a device for protecting an occupant moving rearward due to an inertial force caused by the collision when a collision occurs from behind the vehicle, the first inflatable portion and the second inflatable portion do not move the occupant's head in the front-rear direction. An airbag device provided with an airbag constrained to the airbag is known (see Patent Document 1).
Such an airbag device has a protection mode in which the airbag is deployed and received before the occupant moves due to the collision.

JP 2008-189023 A

  However, when the occupant is received at the position where the occupant has moved as in the conventional occupant protection device, the occupant's head and neck receive the inertial force caused by the magnitude of the impact and the occupant's weight. . This could be one of the factors that increase the injury value to the head and neck, especially the neck.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide 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.

  As a means for solving the above problems, an occupant protection device according to the present invention is an occupant protection device that can protect an occupant sitting on a seat when an impact acts on a vehicle, A seat belt that is hung over a shoulder of the backrest, and a holding member that is provided on a rear surface of the backrest and holds one end of the seatbelt and can pull the seatbelt. When the vehicle is towed, the contact portion of the shoulder with the seat belt has a weak portion that can be deformed downward to a position below the shoulder of the seated occupant, and the holding member has It is provided below the lower end of the fragile portion.

  In the occupant protection device according to the present invention, it is preferable that the fragile portion is deformable while being inclined downward or inward in the width direction of the seat.

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

  According to the present invention, when the seat belt is towed by the holding member when the vehicle receives an impact due to the collision, the seat is held against the contact portion of the shoulder with the seat belt while increasing the restraining force of the occupant. The belt deforms the fragile portion downward and bites into it. This achieves sufficient restraint of the occupant's shoulders and chest, so that the occupant's head can be prevented from directly contacting any member, for example, a rear gate, a rear glass, a ceiling, a collision body, or the like. An apparatus can be provided.

FIG. 1A and FIG. 1B are schematic views showing a conventional rear-side collision with a vehicle. 2 (a) and 2 (b) are schematic diagrams showing a conventional rear-side collision with a vehicle. FIG. 3 is a schematic diagram showing a conventional collision mode from behind with respect to a 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 front schematic view showing an upper part of a seat provided with the occupant protection device, and FIG. 4 (b) is an occupant. It is a side view schematic which shows the side part of a seat provided with a protection device. FIG. 5 is a schematic diagram showing one driving mode of the occupant protection device shown in FIG. FIG. 6 is a schematic diagram showing an occupant protection device according to another embodiment of the present invention, and FIG. 6A is a front schematic diagram showing an upper part of a seat provided with an occupant protection device according to a modification. FIG. 7B is a schematic front view showing one driving mode of the occupant protection device shown in FIG.

(Conventional rear impact form)
First, a case where a conventional vehicle is collided from behind will be described with reference to FIGS.
FIGS. 1 to 3 are schematic views showing one collision mode 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.

  The vehicle 100 has a ceiling portion 101, a rear gate 102, a floor portion 103, and wheels 104 at a rear portion thereof. The ceiling part 101 is a member that extends in the front-rear direction and the width direction of the vehicle 100, such as a roof panel, and is a member that forms the upper surface of the passenger compartment. The rear gate 102 is a door member that opens and closes a luggage compartment formed on a part of the rear side of the passenger compartment, and is a member that constitutes a rear surface portion of the passenger compartment. The floor portion 103 is a member that extends in the front-rear direction and the width direction of the vehicle 100 on which the seat 110 is disposed, and is a member that forms a lower surface portion of the passenger compartment. The wheels 104 are members for traveling forward and backward of the vehicle 100, which roll on the road surface by being rotated by receiving a driving force from a driving source such as an engine.

  The seat 110 has a seat surface 111, a backrest 112, a headrest 113, and a seat belt device 114.

  The seat portion 111 is a portion where the occupant C sits, and is fixed to the floor portion 103.

  The backrest 112 is a part that the occupant C can lean on when the occupant C comes into contact with the back surface. The seat portion 111 and the backrest 112 are connected via a connection member such as a rotating shaft that can be fixed for realizing the reclining function.

  The headrest 113 is a portion where the occupant C can stabilize the head of the occupant C by bringing the back of the head into contact. The backrest 112 and the headrest 113 are connected via a telescopic shaft 115. The shaft 115 can be inserted into and removed from an opening formed in a shoulder, which is the upper end surface 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 has a belt member 116, a retractor 117, and an anchor member 118. The belt member 116 is a belt-like member that is closely attached to the occupant C when no abnormality such as a collision occurs. The retractor 117 is a member that is attached to the rear surface of the backrest 112 and that can fix one end of the belt member 116 and wind up an excess belt member 116. As shown in FIG. 1, the belt member 116 pulled out from 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 a member that is attached to the side of the seat surface 111 and fixes the other end of the belt member 116.

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

  When a collision occurs from the rear 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 first become the state shown in FIG. 1B. 1B, 2 and 3, the black arrow behind the rear gate 102 indicates the load input due to the collision.

  When a collision occurs from behind the vehicle 100, the occupant C is pressed against the backrest 112 by the inertial force resulting from the collision, as shown in FIG. Due to the collision, a rearward load including a load against which the occupant C is pressed and a load due to an inertial force caused by the weight of the backrest 112 itself acts on the backrest 112.

  In the state shown in FIG. 1B, the back of the occupant C is sunk with respect to the backrest 112. At this time, since the seat belt device 114 maintains a state in which the vehicle 100 shown in FIG. 1A does not cause a collision, the seat belt device 114 is provided between the belt member 116 and the shoulder, chest, and waist of the occupant C. Gaps occur. That is, before the collision shown in FIG. 1A, the occupant C and the belt member 116 are almost in close contact with each other. Will occur. As a result, the restraining force of the occupant C by the seat belt device 114 may slightly decrease when a collision occurs.

When the load acting on the backrest 112 is large, the seat 110 and the occupant C change from the state illustrated in FIG. 1B to the state illustrated in FIG.
Specifically, a part of the connecting member between the seat portion 111 and the backrest 112 is broken by the rearward load acting on the backrest 112. Due to the breakage of the connection member, it becomes difficult to maintain the initial position of the backrest 112 shown in FIGS. 1A and 1B. Even if the connecting member breaks, the occupant C continues to receive inertial force so as to be further pressed against the backrest 112. Thereby, as shown in FIG. 2A, the occupant C falls backward with the backrest 112.
The gap created between the occupant C and the belt member 116 when the collision occurs remains in the state shown in FIG.

When the load acting on the backrest 112 is large, the seat 110 and the occupant C change from the state illustrated in FIG. 2A to the state illustrated in FIG.
Specifically, when the occupant C continues to be pressed against the seat 110, the mounting portion of the shaft 115 connecting the backrest 112 and the headrest 113 is deformed. Thus, as shown in FIG. 2B, the headrest 113 starts to fall backward while the backrest 112 falls backward. When the headrest 113 falls backward, the headrest 113 comes into contact with the rear gate 102. Note that the contact of the headrest 113 with the rear gate 102 also includes a mode in which the headrest comes into contact with the rear view rear glass provided on the rear gate 102. When the headrest 113 comes into contact with the rear gate 102, the operation of falling backward of the backrest 112 and the occupant C stops.
Note that the gap generated between the occupant C and the belt member 116 when the collision occurs remains in the state shown in FIG. 2B from the state shown in FIG. 2A.

When the load acting on the backrest 112 is large, the occupant C changes from the state shown in FIG. 2B to the state shown in FIG.
Specifically, even if the backrest 112, the headrest 113, and the occupant C incline backward by the contact between the headrest 113 and the rear gate 102, the occupant C continues to receive the inertia force in the backward direction. Accordingly, the occupant C moves upward along the inclined backrest 112 so as to rise rearward. When the occupant C moves rearward and upward, the head of the occupant C comes into contact with the rear gate 102.
Note that when the relative speed of the colliding body colliding with the vehicle 100 is high, the colliding body may push the rear gate 102 shown in FIG. As a result, the head of the occupant C that has moved upward and rearward may come into contact with the collision body. As a result, not only does the injury value of the head of the occupant C rise, but also a large load is applied to the neck supporting the head because the head is pressed against the rear gate 102 by the inertia force received by the occupant C. As a result, the injury value of the neck of the occupant C also increases.

  Usually, a mechanism for locking the belt member 116 from being suddenly pulled out is incorporated in the retractor 117 or the like. When the occupant C moves rearward and upward as shown in FIG. 3, the shoulder of the occupant C is hooked on the belt member 116, so that the belt member 116 is suddenly pulled out. However, since the belt member 116 is left behind due to the gap formed between the occupant C and the belt member 116 shown in FIG. 1B, the rearward upward movement of the occupant C slightly progresses. After that, there is a possibility that abrupt withdrawal of the belt member 116 starts to occur. Therefore, when the gap generated between the occupant C and the belt member 116 is large, the function of locking the sudden withdrawal of the belt member 116 may not be exhibited until immediately before the head of the occupant C contacts the rear gate 102. was there.

  As described above, as shown in FIGS. 1 to 3, when a collision occurs with the conventional vehicle 100 from behind, the occupant C moves to the rear gate 102 by moving upward to move backward. Contacted from the department.

  In the present embodiment, even if the mounting portion of the shaft 115 supporting the headrest 113 is not deformed at the shoulder of the backrest 112, the headrest will not move relative to the rear gate 102 if the backrest 112 continues to fall. 113 will come into contact.

(Overview of Basic Embodiment)
Next, an occupant protection device 1 according to an embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a schematic diagram showing an occupant protection device according to an embodiment of the present invention, and FIG. 4A is a schematic front view showing an upper part of a seat provided with the occupant protection device, and FIG. FIG. 2 is a schematic side view showing a side of a seat provided with the occupant protection device. Since the same members as those shown in FIGS. 1 to 3 are used for the vehicle 100 and the seat 110 in FIG. 4, common reference numerals are given.

  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 concave portion 41.

The belt member 2 is a band-shaped member that abuts on the occupant and restrains the occupant. Fixed to The above-described anchor member 118 is a member for fixing the belt member 2, and is normally fixedly disposed on the side of the seat surface 111 of the seat 110 or on the floor 103. The belt member 2 is inserted between the retractor 3 and the anchor member 118 by a tongue plate that is detachably attached to a buckle that is fixedly disposed on the right and left opposite sides to the anchor member 118. The tongue plate and the buckle (both not shown) are members for guiding the belt member 2.
As shown in FIG. 4B, in the present embodiment, the belt member 2 is provided between the one end side held by the retractor 3 and the front side of the backrest 112 fixed to the anchor member 118. It is hung over the shoulder 119 of the rest 112. Note that a contact portion of the shoulder 119 with the belt member 2 is referred to as a contact portion 120.

  The retractor 3 is a member that fixedly holds one end of the belt member 2, and is capable of winding and feeding the belt member 21. Normally, the retractor 3 winds up the surplus belt member 2 that is not used for restraining the occupant C and stores the belt member 2 in a retracted state. The retractor 3 in the present embodiment is attached to the rear surface of the backrest 112 by an appropriate fixing member so that its position does not change 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 for the winding operation of the belt member 2 at the time of collision by the retractor 3, gas generating means 5 fixedly attached to a seat frame 4 described later is used.
The gas generating means 5 is a member that generates a high-pressure gas for the retracting operation of the belt member 2 by the retractor 3 when the occupant protection device 1 is driven. As the gas generating means 5, specifically, an explosive used for an inflator or the like of an airbag, a gas cylinder filled with a high-pressure gas, or the like can be used.

  In the embodiment shown in FIG. 4, the retractor 3 is disposed below the embodiment shown in FIGS. 1 to 3, but the vertical position of the retractor 3 is not particularly limited as long as the object of the present invention can be achieved. Not done.

The seat frame 4 is a rod-shaped or tubular member arranged 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 includes an upper and lower frame portion 42 extending vertically on both sides in the width direction of the seat 110, and a width frame portion which connects between upper ends of the upper and lower frame portions 42 in the width direction of the seat 110 and connects them. 43.
As shown in FIG. 4A, a concave portion 41 is formed in a part of the width frame portion 43, which is the upper end portion of the seat frame 4, so as to be bent and depressed downward.

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

The position where the concave portion 41 is formed is a position which is a part of the width frame portion 43 and corresponds to a position below 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 partially bending the width frame portion 43 downward. The recess 41 is formed to be inclined inward 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 passed may be reversed left and right. It is preferable that the direction of inclination is reversed so that the seat 110 is directed inward in the width direction of the seat 110. Of course, the concave portion 41 may have a contour formed by a curve, or may be formed by, for example, being curvedly deformed.
The size of the concave portion 41, especially 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. In the present embodiment, the size is equal to the width of the belt member 2. Is set.

  In the seat frame 4, as shown particularly in FIG. 4B, the concave portion 41 is not parallel to the upper and lower frame portions 42, but is bent so that the belt receiving portion 44 is located rearward of the upper and lower frame portions 42. It is transformed. This is because if the concave portion 41 is not bent and deformed, the concave portion 41 abuts on the scapula of the occupant C leaning against the backrest 112 and the vicinity thereof, so that the occupant C is recognized as an obstacle and sits down. This is because there is a possibility that the comfort may be uncomfortable.

  Note that the belt member 2 is an example of a seat belt in the present invention, the retractor 3 is an example of a holding member in the present invention, and the concave portion 41 is an example of a concave portion in the fragile portion of the present invention.

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

  The occupant protection device 1 according to the present embodiment is driven when the occupant C is pressed against the backrest 112 by the inertia force received by the occupant C due to the collision, as shown in FIG. It's getting started. As the driving timing of the occupant protection device 1 according to the present embodiment, the state shown in FIG. 1B is changed to the state shown in FIG. 3, that is, the headrest 113 of the seat 110 abuts the rear gate 102, and the occupant C And can be set arbitrarily before the state where the head of the occupant C contacts the rear gate 102.

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

  When the belt member 2 is wound, the gap generated between the occupant C and the belt member 2 decreases. Since the gap disappears as the gap decreases, the belt member 2 comes into close contact with the occupant C's chest.

  Further, winding of the belt member 2 proceeds. Thereby, the belt member 2 is pressed downward against 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 similarly to 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 digs down against the shoulder 119 while compressing the contents.

  Since the concave portion 41 of the seat frame 4 is provided below the contact portion 120, the biting of the belt member 2 is not prevented. By fitting the belt member 2 into the concave portion 41, the belt member 2 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 hooked on the belt receiving portion 44 which is the lower end of the concave portion 41, the further biting of the belt member 2 into the backrest 112 does not progress. Here, the gas generation of the gas generating means 5 is stopped. As a result, when the retracting operation of the belt member 2 by the retractor 3 stops, the operation of the belt member 2 trying to cut into the backrest 112 also stops.

  When the belt member 2 bites down 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, and may be broken due to the elasticity caused by the properties 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 restraining force of the occupant C by the belt member 2 which has been reduced due to the collision is increased, and the belt member 2 is held at the shoulder 119 of the backrest 112 while maintaining a constant restrained state. Bite into. Thereby, as shown by the black arrows in FIG. 5B, the gap between the occupant C and the belt member 2 in the state shown in FIG.

  Further, the belt member 2 is hooked on the belt receiving portion 44, so that the restraint state is established such that the belt member 2 gets over the shoulder portion of the occupant C from below the height of the shoulder portion of the occupant C. As a result, the belt member 2 comes into contact not only with the upper end of the shoulder of the occupant C but also with the portion near the scapula, and a restrained state in which the occupant C adheres more closely along the body of the occupant C is realized.

  The occupant protection device 1 according to the present embodiment particularly restrains the shoulder and the chest of the occupant C with a high restraining force. Can be prevented or reduced. Thus, it is possible to prevent the head of the occupant C from coming into contact with the members constituting the occupant compartment.

  Furthermore, in this embodiment, since the belt member 2 is stretched across the shoulder 119 of the backrest 112, not only the situation where a collision has occurred from the rear but also the vehicle 100 Can be reliably restrained by the belt member 2 even in a situation in which the occupant C moves vertically and horizontally.

In addition, instead of the embodiment in which the occupant C is restrained by the winding operation of the belt member 2 of the retractor 3 as shown in FIG. 4 and FIG. It may be a form having a moving mechanism of the retractor 3 via a cylinder, a piston, and the like to be performed. In other words, the belt member 2 is pulled 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.
Further, the belt member 2 may be wound by the retractor 3 while the retractor 3 is moved downward.

  In the present embodiment, since the concave portion 41 is inclined inward in the width direction of the seat 110, as the belt member 2 bites into the shoulder portion 119, the contact of the belt member 2 at the shoulder portion of the occupant C proceeds. The contact position will be closer to the neck. By restraining the occupant C at a position near the neck, it is possible to suppress a situation in which the shoulder of the occupant C comes off the belt member 2.

  In addition, when the concave portion 41 is inclined inward in the width direction, the optimal restraint position for the various occupants C having various shoulder widths and shoulder heights is set to the shoulder portion 119 by the belt member 2. It is likely to be found on the way. Therefore, a suitable restraint state can be realized for all the occupants C having various bodies.

  Further, in a case where the retractor 3 is moved, the retractor 3 may be moved by an urging member instead of the gas generator 5. As such a configuration, for example, an urging member that is maintained so that a downward urging force is always applied when no collision occurs is provided, and the retractor 3 is fixed. May be released, and the retractor 3 may be moved downward by the urging force of the urging member.

(Modification)
Next, FIG. 6 shows a modification of the occupant protection device according to the present invention.
FIG. 6 is a schematic diagram showing an occupant protection device according to another embodiment of the present invention, and FIG. 6A is a front schematic diagram showing an upper part of a seat provided with an occupant protection device according to a modification. FIG. 7B is a schematic diagram illustrating one driving mode of the occupant protection device illustrated in FIG.
The seat shown in FIG. 6 uses the same members as those shown in FIGS. 4 and 5, and therefore, is assigned the same reference numerals.

  In the embodiment shown in FIG. 6, a soft member 6 is arranged instead of the concave portion 41. More specifically, in the occupant protection device 10 illustrated in FIG. 6, the vertical position of the width frame portion 43 that is the upper end of the seat frame 4 is lowered to the vertical position of the belt receiving portion 44 that is the lower end of the recess 41. Is formed. Further, inside the shoulder portion 119 of the backrest 112 and the vicinity thereof where the width frame portion 43 formed by reducing the height maintains the shape, the columnar hard member 7 is arranged along the width direction of the seat 110. Is arranged.

The soft member 6 is formed of a material that does not or does not easily cause the belt member 2 to bite into the shoulder 119 of the backrest 112. The soft member 6 is disposed in the backrest 112 from the inside of the contact portion 120 to the upper portion of the width frame portion 43.
The hard member 7 is a member for maintaining the shape of the shoulder portion 119 and the like where the width frame portion 43 is no longer disposed, and is formed of a material having higher strength than the soft member 6. As a material of the hard member 7, for example, even when the back surface of the occupant C abuts on a portion where the hard member 7 is disposed, the seating posture is easily maintained without feeling uncomfortable without being too soft compared to the width frame portion 43 of the seat frame 4. Preferably, it is a material.

  As the traction form of the belt member 2 in the occupant protection device 10, the winding of the belt member 2 by the gas generating means 5 and the retractor 3 in the occupant protection device 1 can be adopted. When the occupant protection device 10 is driven, the belt member 2 is wound and pulled by the rear surface of the backrest 112, so that a load is applied from the belt member 2 to the shoulder 119 of the backrest 112. As a result, the belt member 2 starts to bite into the shoulder 119.

  In the embodiment shown in FIG. 6, since the soft member 6 is disposed below the contact portion 120, the bite of the belt member 2 is not prevented. When the belt member 2 compressively deforms or breaks the soft member 6 downward, the belt member 2 bites into the backrest 112 until it reaches the width frame portion 43 formed by lowering the vertical position.

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

  Thus, the driving of the occupant protection device 10 is completed. When the occupant protection device 10 is driven, the restraining force of the occupant C by the belt member 2 that has been reduced due to the collision is increased, and the belt member 2 is held at the shoulder 119 of the backrest 112 while maintaining a constant restrained state. Bite into. Thus, the gap between the occupant C and the belt member 2 in the state shown in FIG.

  Further, by the belt member 2 being hooked on the belt receiving portion 44, the belt member 2 is restrained so as to get over the shoulder of the occupant C from below the height of the shoulder of the occupant C. As a result, the belt member 2 comes into contact not only with the upper end of the shoulder of the occupant C but also with the portion near the scapula, and a restrained state in which the occupant C adheres more closely along the body of the occupant C is realized.

  Since the occupant protection device 10 according to the present embodiment particularly restrains the shoulder and the chest of the occupant C with a high restraining force, when the vehicle 100 receives an impact from the rear, the occupant C can be rearward and upward. Can be prevented or reduced. Thus, it is possible to prevent the head of the occupant C from coming into contact with the members constituting the occupant compartment.

In a normal vehicle, a shoulder anchor that is attached to a skeleton member such as a B pillar, a C pillar, or a D pillar and is a relay member of the belt member 2 is not arranged in the embodiments illustrated in FIGS. This is because the shoulder anchor attached to the skeletal member can restrain the occupant C from the front to the rear, but is a relay form of the belt member 2 such that it hangs over the shoulder 119 of the backrest 112. This is because it is difficult to make the belt member 2 bite into the shoulder 119 downward.
When the shoulder anchor is provided, the shoulder anchor is fixedly attached to or near the shoulder portion 119 of the backrest 112, and when the belt member 2 is pulled, the belt member 2 is attached to the shoulder portion 119 together with the shoulder anchor. Any form can be used.

  Further, the holding member such as the retractor 3 may be disposed inside the rear surface of the backrest 112. Further, in order to take a reaction force when the belt member 2 bites into the backrest 112, the retractor 3 is securely fixed and the mounting work is easily performed. The floor unit 103 may be used.

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

1 and 10: occupant protection device, 2: belt member, 3: retractor, 4: seat frame, 41: concave portion, 42: upper and lower frame portion, 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: occupant

Claims (4)

An occupant protection device that can protect an occupant sitting on a seat when an impact acts on a vehicle,
A seat belt that is hung over the shoulder of the backrest of the seat,
A holding member that is provided on a rear surface portion of the backrest and holds one end side of the seat belt and is capable of towing the seat belt;
The backrest has a weak portion where the contact portion of the shoulder with the seatbelt can be deformed downward when the seatbelt is pulled to a position below the shoulder of the seated occupant. And
The holding member is provided below the lower end of the fragile portion,
Occupant protection device. The weak portion can be deformed by inclining downward or inward in the width direction of the seat,
The occupant protection device according to claim 1. The fragile portion has a concave portion formed by being deformed downward from an upper end portion extending in the width direction of the seat in the seat frame arranged in the backrest.
The occupant protection device according to claim 1. Lower the upper end of the seat frame placed in the backrest and form
The fragile portion has a soft member disposed in the backrest from the inside of the contact portion between the shoulder portion of the backrest and the seat belt to the upper portion of the upper end of the seat frame.
The occupant protection device according to claim 1.

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