JP2008238910A - Vehicular seat system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat system capable of supporting a head portion of an occupant and protecting a neck portion while decreasing impact to a body of the occupant, for example, upon heavy rear collision. <P>SOLUTION: The vehicular seat belt system has a vehicular seat equipped with a seat cushion, a seat back, and a headrest; and a seat belt device equipped with a seat belt and a pretensioner mechanism portion. In the vehicular seat belt system, a headrest moving mechanism portion detecting the backward movement of a seated occupant upon rear collision, and moving the headrest close to a head portion of the seated occupant; and a seat back backward tilting mechanism portion tilting the seat back backward when a backward load not less than a predetermined value is received due to the backward movement of the seated occupant upon the rear collision, are provided. The pretensioner mechanism portion instantly gives tension not less than a predetermined value to the seat belt for restraining the occupant to a seat seating surface, with the backward tilting of the seat back due to the seat back backward tilting mechanism portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle seat system, and more specifically, a vehicle seat including a seat cushion, a seat back that can be tilted with respect to the seat cushion, and a headrest attached to an upper end of the seat back. And a seat belt that can restrain an occupant seated on the seat, and a pretensioner mechanism that applies tension to the seat belt to restrain the occupant when a predetermined state of the vehicle is detected.

  Conventionally, various techniques for protecting the occupant's neck when the occupant's torso is pressed against the seat back in the event of a rear vehicle collision (rear collision) with the host vehicle have been proposed. For example, in Patent Document 1 below, when a rear-end collision is detected, the airbag at the upper end of the seat back is deployed in front of the headrest to protect the neck, and at the same time, a tension is applied to the seat belt to restrain the occupant. A vehicle occupant protection device that operates a tensioner mechanism is disclosed. However, since this technique employs an airbag, it is relatively large, and since the airbag is interposed between the head and the headrest, the head may not be reliably held. On the other hand, for example, in Patent Document 2 below, when an active headrest mechanism is employed in which the headrest is moved forward by moving the pressing plate by the rearward movement of the occupant during the rear collision, the motor pretensioner is predicted. A vehicle occupant protection device for operating the mechanism is disclosed.

Japanese Patent Laid-Open No. 11-334503 JP 2005-263017 A

  By the way, as a vehicle seat, for example, when a load exceeding a predetermined value is applied to the host vehicle from the rear, such as during a heavy collision, the seat is seated against the seat cushion in order to reduce the impact from the seat back on the occupant's trunk. Those that slightly tilt the back are known. If this mechanism is applied to Patent Document 2, it is expected that the head of the occupant is supported and the neck is safely protected while reducing the impact on the occupant's torso. However, if the seat back is tilted backward in response to a load of a predetermined level or more applied from the rear to the host vehicle, the occupant moves upward along the seat back and the occupant's torso is displaced. there is a possibility. In this case, although the pressing plate is once moved rearward and the headrest moves forward accordingly, when the occupant moves upward and comes off the pressing plate, the seat back returns, so that the occupant's torso The posture is changed, and it is possible that the backward pressing force against the pressing plate is reduced and the headrest moves backward. As a result, a burden is placed on the neck of the passenger. In Patent Document 2, the motor pretensioner mechanism is operated when a rear-end collision is predicted. However, the motor pretensioner mechanism restrains the occupant with a low torque, so that the occupant cannot be quickly restrained. The movement of the trunk cannot be sufficiently prevented.

  The present invention has been made in view of the above technical problem. For example, when a predetermined load or more is applied to the own vehicle from the rear, such as during a heavy rear collision, the occupant's head is supported and the neck is protected. An object of the present invention is to provide a vehicle seat system that can do this.

  Therefore, an invention according to claim 1 of the present application includes a vehicle seat including a seat cushion, a seat back that is tiltably attached to the seat cushion, and a headrest attached to an upper end of the seat back. A vehicle comprising: a seat belt capable of restraining an occupant seated on the seat; and a seat belt device including a pretensioner mechanism that applies tension to the seat belt to restrain the occupant according to a predetermined state of the vehicle. In the seat system, the headrest movable mechanism that detects the backward movement of the seated occupant at the time of the rear collision and moves the headrest so as to be close to the head of the seated occupant, and the rear movement of the seated occupant at the time of the rear collision A seat back rearward tilt mechanism that tilts the seatback backward when receiving a rear load of a predetermined amount or more, The pretensioner mechanism portion instantaneously applies a predetermined tension or more to the seat belt to restrain the occupant against the seat seat surface as the seat back is tilted backward by the seat back backward tilt mechanism portion. It is what.

  Further, the invention according to claim 2 of the present application is the invention according to claim 1, wherein the headrest movable mechanism portion is configured to provide a rearward movement of the seated occupant at the time of a rear collision and a rear side of a pressure receiving member that receives a rearward load from the seated occupant. It detects by movement, The said pressure receiving member is provided in the lower end side of the said seat back, It is characterized by the above-mentioned.

  Furthermore, the invention according to claim 3 of the present application is the pressure receiving member according to claim 1 or 2, wherein the headrest movable mechanism portion receives a rear load from the seated occupant during the rearward movement of the seated occupant during the rear impact. A connecting member supported by the pressure receiving member so as to be swingable about a predetermined position in a seat back support frame provided to be tiltable with respect to the seat cushion. It is connected with the above-mentioned headrest via.

  Furthermore, the invention according to claim 4 of the present application is the invention according to any one of claims 1 to 3, wherein the pretensioner mechanism portion is tensioned against a lap belt that restrains the occupant's waist to the seat cushion side. It is characterized by adding.

  Furthermore, in the invention according to claim 5 of the present application, in any of the inventions according to claims 1 to 4, the print tensioner mechanism portion is tensioned against a shoulder belt that restrains the occupant's torso to the seat back side. It is characterized by adding.

  Furthermore, in the invention according to claim 6 of the present application, in any of the inventions according to claims 3 to 5, the seat back includes a back support member that supports a rear load on the back of the occupant in a normal seating state. In addition, the back support member is supported below the swing center of the connecting member.

  Furthermore, in the invention according to claim 7 of the present application, in any of the inventions according to claims 3 to 5, the separation distance between the center of the pressure receiving member in the height direction and the swing center of the connecting member is The distance between the center of swing of the connecting member and the center of the headrest in the height direction is equal to or greater than the separation distance.

  According to the invention according to claim 1 of the present application, in the case of a heavy rear-end collision that receives a predetermined or greater rear load as the seated occupant moves rearward, the impact applied to the occupant by the seat back is tilted backward. On the other hand, the position of the occupant torso is shifted upward along the seat back as the seat back is tilted backward, and the detection of the backward movement of the occupant becomes insufficient. Actuation instantly applies a large tension to the seat belt and restrains the occupant against the seat seat surface. Therefore, the rear movement of the occupant is reliably detected, and the head is securely supported by the headrest to protect the neck. Can be improved.

  Further, according to the invention according to claim 2 of the present application, when the pressure receiving member is provided on the lower end side of the seat back, for example, when a rear load is applied to the seat back including a light rear impact, The headrest can be moved quickly. Further, even when the pressure receiving member is on the lower end side of the seat back, it is possible to reliably detect the backward movement of the occupant and improve the head protection by the headrest.

  Further, according to the invention according to claim 3 of the present application, when the seated occupant receives a rearward load of a predetermined amount or more due to the backward movement of the seated occupant, the upward movement of the occupant's body due to the rearward inclination of the seat back is preliminarily performed. The amount of movement of the headrest can be easily ensured by swinging the connecting member so that the headrest moves forward while being regulated by the tensioner mechanism.

  Furthermore, according to the invention of claim 4 of the present application, tension can be applied to the lap belt to restrain the occupant's waist to the seat cushion side.

  Further, the invention according to claim 5 of the present application can apply tension to the shoulder belt to restrain the occupant's torso to the seat back side.

  Furthermore, according to the invention according to claim 6 of the present application, even when the occupant's torso is slightly lifted, the back support member can receive a load instead of the pressure receiving portion, whereby the load is applied to the connecting member. Can be transmitted.

  Further, according to the invention according to claim 7 of the present application, at the time of a rear collision, the seat back is greatly inclined backward, and the occupant's trunk extends the seat back despite the operation of the pretensioner mechanism. Even if it moves slightly upward along the direction, the separation distance between the swing center of the connecting member and the center in the height direction of the headrest is shorter than the separation distance between the swing center and the height direction center of the pressure receiving member. The headrest can be prevented from moving backward after moving forward, and the protection of the neck can be improved.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 and 2 are an assembled perspective view and an exploded perspective view showing a frame structure of a vehicle seat according to an embodiment of the present invention, respectively.
The vehicle seat includes a seat cushion, a seat back that is tiltably attached to the seat cushion, and a headrest that is attached to an upper end of the seat back. The frame structure F is installed on the floor panel side. The seat cushion frame 2 slidably supported on the slide rail 11, the pair of left and right side frames 6 attached to the seat cushion frame 2 via the reclining adjuster 4 so as to be tiltable, and swinging relative to the side frame 6. And a seat back frame 8 movably attached thereto. A headrest 10 is attached to the upper end of the seat back frame 8.

  The left and right reclining adjusters 4 are connected via a connecting shaft 12 (see FIG. 1), and the left and right reclining adjusters 4 are interlocked by operating an operation lever (not shown) attached to one of the reclining adjusters 4. Thus, the side frame 6 is set to a desired angle. The reclining adjuster 4 includes a lower bracket 16 attached to the seat cushion frame 2 and an upper bracket 18 fixed to the lower end of the side frame 6 on the upper end side while being tiltably attached to the lower bracket 16 on the lower end side. ing. Since the reclining adjuster 4 is not the main point of the present invention, detailed description thereof is omitted here.

  The side frame 6 is formed with a guide hole 6 a into which a bolt 24 attached in the vicinity of the lower end portion of the seat back frame 8 is loosely inserted, and a rotary hinge insertion hole 6 b is formed at the upper part of the side frame 6. . Here, the guide hole 6a is formed in an arc-shaped long hole shape centering on the rotary hinge insertion hole 6b.

  Further, the seat back frame 8 with the headrest 10 attached to the upper end is formed in a substantially inverted U shape, and the portion facing the guide hole 6a formed in the side frame 6 is directed toward the guide hole 6a. A protruding first bolt 24 is attached, and a second bolt as a rotating hinge protruding toward the rotating hinge insertion hole 6b is provided at a portion facing the rotating hinge insertion hole 6b formed in the side frame 6. 26 is attached.

  Further, the seat back frame 8 is provided with an S-shaped spring 28 that supports the back surface of the occupant along the width direction thereof. The S-shaped spring 28 is attached below the second bolt 26 corresponding to the swing center of the seat back frame 8 with respect to the side frame 6. In addition, the seat back frame 8 is provided with a resin- or metal-made pressure receiving plate 29 facing the waist portion of the seated occupant along the width direction along with the S-shaped spring 28. The pressure receiving plate 29 is attached in the vicinity of the lower end of the seat back frame 8. The S-shaped spring 28 is in contact with the back surface of the pad material that covers the seat back frame 8, whereas the pressure receiving plate 29 is separated from the back surface of the pad material, and this is the first time when a person is sitting. Abuts the pad material.

  In addition, one end of the coil spring 30 is locked to the left and right lower ends of the seat back frame 8, and the other end of the coil spring 30 is locked to the rear ends of the left and right side frames 6. With the coil spring 30, both lower ends of the seat back frame 8 are always urged forward.

  When attaching the seat back frame 8 to the side frame 6, the first bolt 24 is inserted into the guide hole 6 a of the side frame 6, and the second bolt 26 is inserted into the rotary hinge insertion hole 6 b of the side frame 6, Nuts 34 and 36 are screwed into the first and second bolts 24 and 26 protruding outward from the holes 6a and 6b, respectively. Thereby, in the assembled state of the frame structure F, as shown in FIG. 2, the seat back frame 8 is centered on the axis corresponding to the second bolt 26 (indicated by the symbol C) with respect to the side frame 6, It is supported so as to be able to swing in the direction indicated by arrow A. FIG. 2 shows a normal state. In this state, the seatback frame 8 is biased forward by the coil spring 30 on the lower end side thereof, so that the first bolt 24 is guided by the guide hole 6a. It is located on the front end side.

  According to such a structure, when a load of a predetermined value or more is input from the rear due to a collision (rear collision) of the rear vehicle with the own vehicle, when the occupant is relatively pressed against the seat back, the occupant's buttocks are moved to the coil spring. The pressure receiving plate 29 is pushed rearward against the urging force of 30, and the seat back frame 8 swings around the axis C using the second bolt 26 as a rotary hinge. It is moved toward the head to support the head of the passenger and the neck is protected.

  FIG. 3 is a side view showing a normal state of the vehicle seat and an occupant seated on the seat. 3 to 6, the seat cushion and the seat back are shown with reference numerals 3 and 5, respectively, which include a configuration including each frame structure and a pad material covering them. It shall be expressed. In order to clarify the drawings, in FIGS. 3, 4 and 6, the seat back frame 8 in the seat back 5 and the structure directly connected thereto are shown by solid lines.

  As can be seen from FIG. 3, in a normal state, the occupant P wearing the seat belt 43 is seated so that the buttock and the waist are in contact with the seat cushion 3 and the seat back 5. In this state, no load exceeding the urging force of the coil spring 30 is applied to the seat back frame 8 of the seat back 5, and the seat back frame 8 is held without swinging with respect to the side frame 6. Further, in this state, the headrest 10 attached to the upper end of the seat back frame 8 is separated from the head of the occupant P at a predetermined interval (or is in light contact).

  As described above, when a load of a predetermined value or more is input from the rear due to a heavy rear-end collision or the like, the occupant's torso is pressed against the seat back 5 relatively, and at this time, the occupant's torso is Therefore, the pressure-receiving plate 29 is pushed backward against the urging force of the coil spring 30, so that the seat back frame 8 swings with the second bolt 26 as a rotary hinge, and the headrest 10 moves toward the head of the occupant. It moves and supports the head of the passenger.

  In the present embodiment, as shown in FIG. 3, the separation distance (indicated by a symbol Y) between the center of the pressure receiving plate 29 in the height direction and the second bolt 26 that becomes the swing center of the seat back frame 8 is the first. Each component is dimensioned so as to be equal to or greater than a separation distance (indicated by symbol X) between the two bolts 26 and the center of the headrest 10 in the height direction (indicated by symbol G).

  Further, in the present embodiment, the seat back 5 is slightly attached to the seat cushion 3 in order to reduce the impact on the occupant's torso when a load of a predetermined level or more is applied to the host vehicle from behind such as during a heavy collision. A seatback rearward tilt mechanism for rearward tilting is employed. Specifically, the seat cushion 3 is provided with a plate-like side frame 2s extending in the front-rear direction on both the left and right sides as one configuration of the seat cushion frame 2. When a predetermined load or more is applied to the host vehicle from behind, such as during a heavy collision, the thinned portion of the side frame 2s is curved upward as shown in FIGS. As a result of plastic deformation, the seat back 5 tilts backward from the reference standing position by a predetermined angle or more (for example, 15 ° or more) around the hinge portion where the lower end of the seat back 5 is supported by the rear end of the seat cushion frame 2. It is supposed to be. The mechanism for tilting the seat back 5 slightly backward with respect to the seat cushion 3 when a load exceeding a predetermined value is applied to the host vehicle is not limited to this. For example, the hinge structure in the reclining adjuster 4 What was devised may be adopted.

  By the way, when the seat back 5 is tilted backward in accordance with a load greater than a predetermined value applied to the host vehicle from behind by the seat back backward tilt mechanism, the occupant P moves upward along the seat back 5. It may move and float from the seat cushion 3. In this case, the pressure receiving plate 29 is once moved backward against the urging force of the coil spring 30 and the headrest 10 is moved forward. However, when the occupant P moves upward and comes off the pressure receiving plate 29, the pressure receiving plate 29 moves upward. Since the load center of the moved occupant P moves upward, the back and head of the occupant P strongly press the upper side from the axis C of the headrest 10 and the seat back frame 8, and the urging force of the coil spring 30 also acts. Thus, the pressure receiving plate 29 returns to the front. As a result, the supportability of the head by the headrest 10 is weakened, the headrest 10 is moved back again, and a burden is placed on the neck of the occupant P. For reference, FIG. 4 shows a state in which the seat back 3 tilts backward and the occupant P floats upward in the event of a heavy rear collision when the vehicle seat system according to the present invention is not employed.

  In order to cope with such a problem, in the present embodiment, a pretensioner mechanism that instantaneously applies a predetermined tension or more to the seat belt is provided, and this mechanism is used at the time of heavy rear collision. FIG. 5 schematically shows a vehicle seat system including a seat belt device including a vehicle seat and a pretensioner mechanism. Here, as a seat belt device, a tongue plate 45 provided in the middle of the seat belt 43 is engaged with a buckle 46 installed on the inner side of the seat cushion 3 so that the seated passenger P is restrained by the seat. A three-point device is employed. In such a three-point seat belt apparatus, the seat belt 43 is distinguished from the tongue plate 45 as a lap belt that restrains the waist of the occupant P on the seat cushion 3 side and a shoulder belt that fixes the body to the seat back 5 side. However, in this embodiment, a lap pretensioner that directly restrains the lap belt is employed as the print tensioner device 50. That is, one end of the seat belt 43 pulled out from the retractor 42 installed near the lower end of the center pillar 40 is pulled down through the anchor 44 provided above the center pillar 40 and passed through the tongue plate 45. Thus, the pretensioner device 50 installed in the side sill 41 near the seat is connected via a wire 52.

  Although not shown in particular, the pretensioner device 50 is composed of an ignition heater, an ignition agent, a piston, and the like. For example, when a predetermined deceleration or more is detected or the seat belt 43 is pulled out from the retractor 42 at a predetermined speed or more. Ignition is performed according to a predetermined state of the vehicle such as when it is detected. The piston of the cylinder is pushed up by the gas pressure generated by this ignition, and an operating force for retracting the seat belt 43 is generated. By the operation of the print tensioner device 50, the seat belt 43 is pulled in via the wire 52, and in particular, the waist portion of the occupant P is restrained with respect to the seat seat surface and held in that state. The print tensioner device 50 has a tension several times higher than that of a motor type pretensioner that increases the restraining force of the seat belt 43 with a weak tension so that the operability of the passenger P is not significantly deteriorated when a collision is predicted. It attaches to the belt 43 and restrains the occupant P.

  In the present embodiment, the pretensioner device 50 is actuated when a predetermined load or more is applied to the host vehicle from the rear, such as during a heavy rear collision, whereby the seat back 5 by the seat back rearward tilt mechanism described above is operated. Even when the vehicle is tilted backward, the occupant P is prevented from moving upward along the seat back 5 and coming off the pressure receiving plate 29. FIG. 6 shows a state in which the occupant P is constrained to contact the seat seat surface while the seat back 5 is tilted backward in the event of a heavy rear-end collision when the vehicle seat system according to the present invention is employed. .

  That is, when a predetermined load or more is applied to the host vehicle from the rear, such as during a heavy rear collision, the seat back 5 is tilted backward for the purpose of reducing impact by the above-described seat back backward tilt mechanism, For example, the pretensioner device 50 causes the seat belt 43 to be pulled in the direction of the arrow D through the wire 52 in response to the detection of a predetermined deceleration or more, and the seat belt 43 has a predetermined tension or more. Is actuated instantaneously so that is added. Accordingly, the seat belt 43 is pulled in before the occupant P moves upward along the seat back 5, and the occupant P is restrained so as to contact the seat surface. As a result, the waist of the occupant P does not deviate from the position where the pressure receiving plate 29 can be moved, and the pressure receiving plate 29 is once moved rearward and then held at the rear position, whereby the headrest 10 is held at the front position. Thus, the head of the occupant P can be reliably supported and a burden on the neck can be prevented.

  As is clear from the above description, according to the present embodiment, the seat back 5 is tilted backward by causing the seat back 5 to tilt backward at the time of a heavy rear-end collision that receives a predetermined rear load or more as the occupant P moves backward. While the impact load applied to the occupant is reduced, the body of the occupant P is displaced upward along the seat back 5 as the seat back 5 is tilted backward, and detection of the backward movement of the occupant P becomes insufficient. In response, the waist of the occupant P moves the pressure receiving plate 29 in order to instantly apply a large tension to the seat belt 43 and restrain the occupant P to contact the seat seat surface by the operation of the pretensioner device 50. It is held at the position to be obtained, the rearward movement of the occupant P is reliably detected, and the headrest can be reliably supported by the headrest 10 to improve the neck protection.

  In the present embodiment, the seat back 5 is provided with an S-shaped spring 28 that supports the rear load on the back of the occupant in a normal seating state while being supported below the swing center of the seat back frame 8. The body of the occupant P also tends to return to the front due to the reaction of the letter spring 28. However, since the occupant P is restrained to contact the seat surface by the operation of the pretensioner device 50, the occupant is more prominent. It is possible to prevent the neck from being burdened by supporting the head of P.

  Further, even if the body of the occupant P is slightly lifted, a load can be transmitted to the seat back frame 8 via the S-shaped spring 28 positioned on the upper side instead of the pressure receiving plate 29. Since the headrest 10 is held in the forward position, the head of the occupant P can be supported and the neck can be prevented from being burdened. Such means is not limited to the S-shaped spring 28, and a member (so-called lumbar support) that moves in the front-rear direction and adjusts the position of the waist of the occupant P may be employed.

  Further, in the present embodiment, the pressure receiving plate 29 is provided on the lower end side of the seat back 5, so that a rear load exceeding the urging force of the coil spring 30 is applied to the seat back 5 from the occupant P including during a light rear collision. In this case, the headrest 10 can be moved forward at an early stage. In particular, at the time of heavy rear collision, the headrest 10 can be moved forward in an early and reliable manner while the upward movement of the body of the occupant P accompanying the backward tilt of the seat back 5 is regulated by the pretensioner device 50. Further, since the pressure receiving plate 29 is connected to the headrest 10 via the seat back frame 8 supported so as to be able to swing, the body of the occupant P is moved upward as the seat back 5 tilts backward during a heavy rear collision. The movement amount of the headrest 10 can be ensured by swinging the seat back frame 8 so that the headrest 10 moves forward while being regulated by the pretensioner device 50.

  Furthermore, in the present embodiment, the separation distance between the center of the pressure receiving plate 29 in the height direction and the center of swing of the seat back frame 8 is the center of swing of the seat back frame 8 and the center of the headrest 10 in the height direction. Therefore, when the seatback 5 is tilted backward, the pretensioner device 50 restrains the occupant P to come into contact with the seat seat surface, thereby reliably moving the pressure receiving plate 29 rearwardly. Can be maintained in an upright state, and the protection of the neck can be improved.

It should be noted that the present invention is not limited to the illustrated embodiments, and it goes without saying that various improvements and design changes can be made without departing from the scope of the present invention.
For example, in the embodiment described above, the swing center of the seat back frame 8 is set in the middle of the frame 8 in the height direction, but the lower end of the seat back frame 8 does not pass through the side frame 6 and the seat cushion The frame 2 may be supported so as to be reclining, and the swing center may be provided corresponding to the horizontal frame extending in the seat width direction at the upper end of the frame 8.

  In the above-described embodiment, the swing center of the seat back frame 8 is inserted through the substantially circular rotary hinge insertion hole 6b formed on the side frame 6 side by the second bolt 26 on the seat back frame 8 side. Although it was held at a predetermined position by this, instead of being limited to this, instead of the substantially circular rotary hinge insertion hole 6b, a long hole extending in the substantially front-rear direction is formed on the side frame 6 side, The second bolt 26 may be configured to be movable in the long hole. In the above-described embodiment, when the seat back 5 is tilted backward, the height position of the headrest 10 is lowered, so that the head of the occupant P is positioned relatively upward. By forming a long hole that allows the seat back frame 8 to move upward, the head of the occupant P can be more reliably supported.

  Furthermore, in the above-described embodiment, the lap pretensioner device 50 that directly pulls the lap belt is employed. However, the present invention is not limited to this, and the buckle that applies tension to the seat belt 43 by pulling the buckle 46 downward. A pretensioner device may be employed. In this case, tension can be applied to both the lap belt and the shoulder belt, and the waist of the occupant P is restrained to the seat cushion 3 side, and at the same time, the trunk of the occupant P is restrained to the seat back 5 side. Is done.

  Further, in the above-described embodiment, the headrest movable mechanism is provided on the upper end side of the seat back frame 8 as the pressure receiving plate 29 provided on the lower end side of the seat back frame 8 supported to be swingable moves backward. However, the present invention is not limited to this. For example, when a deceleration of a predetermined level or more is detected, or the seat belt 43 of a predetermined speed or more from the retractor 45 is used. A type in which the headrest 10 is pushed forward by a motor drive according to a predetermined state of the vehicle such as when a drawer is detected may be employed. The present invention can also be applied to the case where the rearward movement of the occupant P is detected (responding) and the headrest 10 is moved forward and upward. If the position of the detection and pressure receiving plate 29 is set on the lower side of the seat back 5, the mechanism enables the seat back frame 8 supporting the headrest 10 to be rotated about the axis C as in the above-described embodiment. It is not limited to things.

It is a disassembled perspective view which shows the seat frame structure of the vehicle seat which concerns on embodiment of this invention. It is an assembly perspective view which shows the seat frame structure of the said vehicle seat. It is a side view which shows the passenger | crew who seated on the vehicle seat and seat at the time of normal driving | operation. FIG. 5 is a side view showing a state in which the seat back tilts backward and the occupant floats upward in the event of a heavy rear collision when the vehicle seat system according to the embodiment is not employed. It is a side view which shows roughly the vehicle seat system provided with the said vehicle seat and the seatbelt apparatus containing a pretensioner mechanism. FIG. 5 is a side view showing a state in which the seat back is tilted backward at the time of heavy rear collision and the occupant is safely held when the vehicle seat system according to the embodiment is adopted.

Explanation of symbols

  2 ... Seat cushion, 5 ... Seat back, 6 ... Side frame, 6a ... Guide hole, 6b ... Rotary hinge insertion hole, 8 ... Seat back frame, 10 ... Headrest, 24 ... First bolt, 26 ... Second bolt , 28 ... S-shaped spring, 29 ... pressure receiving plate, 30 ... coil spring, 43 ... seat belt, 45 ... tongue plate, 46 ... buckle, 50 ... pretensioner device, 52 ... wire, F ... frame structure, P ... occupant, X ... the separation distance between the second bolt and the center of the headrest in the height direction, Y ... the separation distance between the center of the pressure receiving plate in the height direction and the second bolt.

Claims (7)

A vehicle seat comprising: a seat cushion; a seat back that is tiltably attached to the seat cushion; and a headrest attached to an upper end of the seat back;
A vehicle having a seat belt capable of restraining an occupant seated on the seat, and a seat belt device including a pretensioner mechanism that applies tension to the seat belt to restrain the occupant according to a predetermined state of the vehicle. In the seat system,
A headrest movable mechanism that detects the backward movement of the seated occupant at the time of a rear collision and moves the headrest so as to be close to the head of the seated occupant;
A seatback rearward tilt mechanism that tilts the seatback backward when a rearward load of a predetermined amount or more is received in accordance with the rearward movement of the seated occupant during a rear collision,
The pretensioner mechanism section instantaneously applies a predetermined tension or more to the seat belt to restrain the occupant against the seat seat surface as the seat back is tilted backward by the seat back backward tilt mechanism section. A vehicle seat system. The headrest movable mechanism part detects the backward movement of the seated occupant at the time of the rear collision by the backward movement of the pressure receiving member that receives the rear load from the seated occupant,
The vehicle seat system according to claim 1, wherein the pressure receiving member is provided on a lower end side of the seat back. The headrest movable mechanism part detects the backward movement of the seated occupant at the time of the rear collision by the backward movement of the pressure receiving member that receives the rear load from the seated occupant,
The pressure-receiving member is connected to the headrest via a connecting member that is supported so as to be able to swing about a predetermined position in a seat back support frame provided to be tiltable with respect to the seat cushion. The vehicle seat system according to claim 1 or 2.   The vehicular seat system according to any one of claims 1 to 3, wherein the pretensioner mechanism portion applies tension to a lap belt that restrains the occupant's waist to the seat cushion side.   The vehicle seat system according to any one of claims 1 to 4, wherein the print tensioner mechanism portion applies tension to a shoulder belt that restrains the occupant's torso to a seat back side.   The seat back is provided with a back support member that supports a rear load on the back of the occupant in a normal seating state, and the back support member is supported below the swing center of the connecting member. The vehicle seat system according to claim 3, wherein the vehicle seat system is a vehicle seat system.   The distance between the center of the pressure receiving member in the height direction and the center of swing of the connecting member is greater than or equal to the distance between the center of swing of the connecting member and the center of the headrest in the height direction. The vehicle seat system according to any one of claims 3 to 6.

Images