JP4635817B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device that restrains an occupant sitting on a vehicle seat with a belt.

Conventional seat belt devices mainly constrain one shoulder (mainly the shoulder on the side of the vehicle) of an occupant seated in the seat. On the other hand, in recent years, development of a seat belt device for restraining both shoulders of an occupant has been promoted in order to restrain the occupant more reliably. As such a seat belt device, for example, there is a four-point seat belt device for automobiles described in Patent Document 1. In this conventional seat belt device, belts are arranged vertically on both sides of the seat, and an occupant seated on the seat pulls each belt from the left and right to the front center of the body and fixes it with a buckle. As a result, both shoulders of the occupant are firmly restrained by the belt, improving safety when the vehicle is running.
JP-A-6-255445

  However, in the conventional seat belt device described above, although the occupant's restraint is high, the operation until the occupant wears the belt is complicated. In other words, the occupant seated in the seat needs to perform a two-step operation of drawing one belt toward the front of the body and then holding the other belt while pulling the other belt toward the front of the body. It was.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a seat belt device that can restrain both shoulders of an occupant with a simple operation.

  In order to solve the above problems, a seat belt device according to the present invention is a seat belt device that restrains an occupant seated in a vehicle seat with a belt, and is disposed in the vehicle and retracts and retracts the belt. A body-side shoulder anchor and a seat-side shoulder that are arranged on the side body side and the center side of the vehicle so as to sandwich the seat, and are supported above the shoulder portion of the occupant to be restrained by the belt so that the belt can be inserted. The tongue provided on the belt between the anchor, the body side shoulder anchor and the seat side shoulder anchor, the buckle provided on the center side of the vehicle and detachably coupled to the tongue, and the tongue being coupled to the buckle When the combination of the tongue and the buckle is detected by the combination detection unit and the combination detection unit, It is characterized in that a anchor driving means for lowering the.

  In this seat belt device, when the occupant seated on the seat pulls the tongue toward the front side of the body and couples the tongue to the buckle, first, one of the occupants' shoulders (the shoulder on the vehicle side) is restrained by the belt. Further, when the coupling between the tongue and the buckle is detected, the seat side shoulder anchor is lowered by the anchor driving means, whereby the other shoulder (shoulder portion on the vehicle center side) of the occupant is restrained by the belt. As described above, in the seat belt device according to the present invention, after sitting on the seat, both shoulders of the occupant can be firmly restrained by a simple operation of simply connecting the tongue to the buckle.

  The anchor driving means is disposed so as to protrude from the upper part of the seat back of the seat, and includes a support member that supports the seat side shoulder anchor, a guide that guides the support member to be movable in the vertical direction, and a guide for the support member. It is preferable to control the drive unit in the direction in which the support member is lowered in synchronization with the detection of the coupling between the tongue and the buckle by the coupling detection means. With such a structure of the anchor driving means, it is possible to reliably perform the lowering operation of the seat side shoulder anchor when the tongue is coupled to the buckle. Further, it is possible to easily adjust the descending amount of the seat side shoulder anchor by controlling the driving unit.

  Moreover, it is preferable that the retractor is arrange | positioned in a seat back. In this case, the seat belt device can be manufactured integrally with the seat. Furthermore, the belt arrangement around the seat can be made compact.

  As described above, in the seat belt device according to the present invention, both shoulders of the occupant can be restrained by a simple operation. As a result, it is possible to sufficiently protect the occupant while maintaining the convenience of the current three-point seat belt.

  Hereinafter, preferred embodiments of a seat belt device according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a view showing an embodiment of a seat belt device according to the present invention. As shown in FIG. 1, the seat belt device 1 is equipped on a seat S of a vehicle C, and restrains an occupant from an impact generated during a collision by restraining the occupant seated on the seat S with a belt. Device. The seat belt device 1 includes a first belt 2 and a second belt 3 formed by webbing.

  The first belt 2 is connected to a first retractor 4 provided at the lower part of the center pillar P of the vehicle C, and the first retractor 4 is fed out and wound up. One end side of the first belt 2 is routed upward from the first retractor 4 along the center pillar P of the vehicle C, and passes downward through the body side shoulder anchor 5 provided at the upper part of the center pillar P. Wrapped. The other end side of the first belt 2 is routed downward along the center pillar P of the vehicle C so as to be substantially parallel to one end side of the first belt 2, and the vehicle is located below the seat portion Sa of the seat S. It is fixed to the side sill Q of C.

  A tongue 6 is attached between one end side and the other end side of the first belt 2. The tongue 6 is detachably coupled to a buckle 7 disposed beside the seat portion Sa of the seat S on the center side of the vehicle. By connecting the tongue 6 and the buckle 7, one end of the first belt 2 functions as a shoulder belt that restrains the shoulder on the vehicle side of the occupant, and the other end of the first belt 2. Functions as a lap belt for restraining both waists of the occupant.

  On the lower back side of the seat back Sb, a coupling detection sensor (coupling detection means) 8 for detecting the coupling state of the tongue 6 and the buckle 7 is provided (see FIG. 3). Whenever the tongue 6 and the buckle 7 are attached / detached, the coupling detection sensor 8 outputs a state signal indicating the coupling state to the control unit 15 of the anchor driving means 11 described later.

  On the other hand, the second belt 3 is connected to a second retractor 9 provided on the center side of the vehicle in the seat back Sb of the seat S, and the second retractor 9 is fed out and wound up. One end side of the second belt 3 is routed upward from the second retractor 9 and pulled out of the seat S from a belt insertion hole (not shown) provided in the upper portion of the seat back Sb. The other end side of the second belt 3 is routed in the width direction of the vehicle C above the headrest Sc of the seat S, and is connected to the first belt 2 by a tongue 6.

  As shown in FIGS. 1 and 2, an intermediate portion of the second belt 3 is inserted through a seat side shoulder anchor 10 disposed above the headrest Sc of the seat S on the center side of the vehicle C, and is to be restrained. It is supported above the shoulders. The seat side shoulder anchor 10 can be moved up and down by an anchor driving means 11 (see FIG. 3), and the second belt 3 is lowered on the shoulder of the occupant in the center of the vehicle when the seat side shoulder anchor 10 is lowered. It functions as a shoulder belt that restrains the part.

  Next, the structure of the anchor drive means 11 that moves the seat side shoulder anchor 10 up and down will be described in detail.

  As shown in FIG. 3, the anchor driving means 11 includes a resin-made support member 12 formed in a flat bar shape, a pair of upper and lower guides 13 and 13 provided in the seat back Sb, and the support member 12. A motor (driving unit) 14 that applies a driving force to the motor 14 and a control unit 15 that controls driving of the motor 14 are provided.

  The support member 12 is arranged vertically on the center side of the vehicle C in the seat S, and the lower end side of the support member 12 is arranged inside the seat back Sb with the pair of upper and lower guides 13 and 13 being inserted. Yes. A rack 16 is provided on the lower end side of the support member 12. The rack 16 meshes with a pinion 17 attached to the tip of the output shaft 14 a of the motor 14, and transmits the driving force from the motor 14 to the support member 12.

  On the other hand, the upper end side of the support member 12 is disposed so as to protrude upward from the seat back Sb through an insertion hole (not shown) provided in the upper portion of the seat back Sb. The upper end side of the support member 12 is bent upward from a predetermined position toward the headrest Sc, so that the upper end side extends above the shoulder portion of the occupant to be restrained, and the front end portion supports the seat side shoulder anchor 10. ing.

  When receiving a state signal indicating that the tongue 6 and the buckle 7 are coupled from the coupling detection sensor 8, the control unit 15 controls the motor 14 so that the pinion 17 rotates in the direction in which the support member 12 descends. When the control unit 15 receives a state signal indicating that the coupling between the tongue 6 and the buckle 7 has been released from the coupling detection sensor 8, the motor 14 causes the pinion 17 to rotate in the direction in which the support member 12 moves up. To control.

  Next, the operation of the seat belt device 1 having the above-described configuration will be described.

  First, when the occupant seated on the seat S pulls the tongue 6 from the side of the vehicle toward the center of the vehicle and couples the tongue 6 to the buckle 7, as shown in FIGS. 4 (a) and 4 (b). The first belt 2 fed out from the first retractor 4 restrains the shoulder and both waists of the occupant on the vehicle side.

  At this time, a state signal indicating that the tongue 6 and the buckle 7 are coupled is output from the coupling detection sensor 8 to the control unit 15 of the anchor driving means 11. The control unit 15 that has received the status signal controls the motor 14 so that the pinion 17 rotates in the direction in which the support member 12 descends. Then, by the cooperation of the pinion 17, the rack 16, and the guides 13 and 13, as shown in FIGS. 5A and 5B, the seat side shoulder anchor 10 supported by the tip portion of the support member 12 is provided. The vehicle descends to a position that fits the shoulder on the vehicle side of the occupant, and the shoulder on the vehicle center side of the occupant is restrained by the second belt 3.

  On the other hand, when the occupant intends to leave the seat S, the first belt 2 is automatically wound around the first retractor 4 by the occupant removing the tongue 6 from the buckle 7, The restraint between the shoulder portion on the vehicle side portion side of the occupant and both waist portions by the belt 2 is released. Further, when the buckle 7 and the tongue 6 are detached, a state signal indicating that the coupling of the tongue 6 and the buckle 7 has been released is output from the coupling detection sensor 8 to the control unit 15 of the anchor driving means 11. The control unit 15 that has received this state signal controls the motor 14 so that the pinion 17 rotates in the direction in which the support member 12 moves upward. Accordingly, the seat side shoulder anchor 10 is raised to the original position, and the restraint of the shoulder portion on the vehicle center side of the occupant by the second belt 3 is released.

  As described above, in the seat belt device 1, after the occupant is seated on the seat S, the shoulder 6 and the lumbar region of the occupant are firmly restrained at four points by a one-touch operation in which the tongue 6 is coupled to the buckle 7. can do. As a result, it is possible to sufficiently protect the occupant from the impact generated at the time of the collision of the vehicle C and the like, while maintaining the convenience of wearing the belt that the current three-point seat belt has. Further, in the seat belt device 1, the lowering operation of the seat side shoulder anchor 10 can be ensured by employing the anchor driving means 11 having the above-described configuration. In addition, it is easy to adjust the descending amount of the seat side shoulder anchor 10, and the shoulder portion can be reliably restrained in accordance with the body shape of the occupant seated on the seat S.

  Furthermore, in the seat belt device 1, a second retractor 9 for winding and unwinding the second belt 3 is disposed in the seat back Sb. As a result, the seat belt device 1 can be manufactured integrally with the seat S, and the cost of the seat belt device 1 can be reduced and the ease of incorporation into the vehicle C can be improved. Further, the arrangement of the second belt 3 around the seat S can be made compact.

  The present invention is not limited to the above embodiment, and various modifications can be applied. For example, in the above-described embodiment, the second retractor 9 is built in the seat back Sb. From the viewpoint of restraining the occupant's shoulders with a simple operation, as shown in FIG. You may provide the retractor 9 in the ceiling part of the vehicle center side. Even in such a configuration, when the occupant seated on the seat S couples the tongue 6 to the buckle 7, as shown in FIG. 7, the shoulder on the vehicle side of the occupant and both waists are separated by the first belt 2. Be bound. Then, as shown in FIG. 8, the anchor driving means 11 lowers the seat side shoulder anchor 10 to a position where the seat side shoulder anchor 10 fits the shoulder portion of the occupant on the vehicle side, and the shoulder portion of the occupant on the vehicle center side is the second belt 3. Restrained by. Therefore, the shoulder and both waists of the occupant can be firmly restrained at four points by a one-touch operation of coupling the tongue 6 to the buckle 7.

  Moreover, it can replace with the anchor drive means 11 which employ | adopted the rack & pinion mechanism, and can also use the anchor drive means which employ | adopted the expansion-contraction rod. As shown in FIG. 9, the anchor driving means 20 according to this modification includes a telescopic rod 22 that is rotatable about a shaft 21 provided in the thickness direction in the seat back Sb. The distal end of the telescopic rod 22 is fixed to the support member 12, and the proximal end of the telescopic rod 22 is in contact with the distal end of the plunger 23 attached to the drive unit 24.

  In this anchor driving means 20, when the control unit 15 receives a state signal indicating that the coupling between the tongue 6 and the buckle 7 has been released from the coupling detection sensor 8, the driving unit 24 causes the plunger 23 to advance upward. To control. When the proximal end of the telescopic rod 22 is pushed up by the plunger 23, the distal end of the telescopic rod 22 descends opposite to the proximal end, and the support member 12 and the seat side shoulder anchor 10 descend accordingly. Also with the anchor driving means 20, as with the anchor driving means 11, the lowering operation of the seat side shoulder anchor 10 can be ensured, and the lowering amount of the seat side shoulder anchor 10 can be easily adjusted.

  Further, when the belt is routed, the other end side of the first belt 2 may be passed through the seat side shoulder anchor 10 and fixed in the seat back Sb. In this case, the second retractor 9 is provided on the side sill Q, and the second belt 3 routed upward from the second retractor 9 is connected to the first belt 2 by the tongue 6, whereby the first belt 2 functions as a left and right shoulder belt, and the second belt 3 functions as a lap belt.

It is a front view showing one embodiment of a seat belt device concerning the present invention. FIG. 6 is an enlarged perspective view of the vicinity of a seat side shoulder anchor. It is a figure which shows the structure of an anchor drive means. It is a figure which shows operation | movement of the seatbelt apparatus shown in FIG. It is a figure which shows the operation | movement following FIG. It is a front view which shows the seatbelt apparatus which concerns on a modification. It is a figure which shows operation | movement of the seatbelt apparatus shown in FIG. It is a figure which shows the operation | movement following FIG. It is a figure which shows the structure of the anchor drive means which concerns on a modification.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 2 ... 1st belt, 3 ... 2nd belt, 5 ... Body side shoulder anchor, 6 ... Tongue, 7 ... Buckle, 8 ... Coupling detection sensor, 9 ... 2nd retractor, 10 ... Seat side anchor anchor, 11, 20 ... anchor driving means, 12 ... support member, 13 ... guide, 14 ... motor (drive unit), C ... vehicle, S ... seat, Sb ... seat back.

Claims (3)

A seat belt device for restraining an occupant seated in a vehicle seat by a belt,
A retractor disposed in the vehicle for winding and unwinding the belt;
A body-side shoulder anchor that is disposed on the side body side and the center side of the vehicle so as to sandwich the seat, and that supports the belt so that the belt can be inserted above the shoulder portion of the occupant to be restrained by the belt; With seat side shoulder anchor,
A tongue provided on the belt between the body side shoulder anchor and the seat side shoulder anchor;
A buckle provided on the center side of the vehicle and detachably coupled to the tongue;
Coupling detection means for detecting that the tongue is coupled to the buckle;
A seatbelt device comprising: an anchor driving means for lowering the seat side shoulder anchor when the coupling detecting means detects the coupling between the tongue and the buckle. The anchor driving means includes:
A support member disposed so as to protrude from the upper part of the seat back of the seat, and supporting the seat side shoulder anchor;
A guide for guiding the support member to be movable in the vertical direction;
A drive unit that moves the support member up and down along the guide;
2. The seat belt according to claim 1, wherein the drive unit is controlled in a direction in which the support member is lowered in synchronization with detection of the coupling between the tongue and the buckle by the coupling detection unit. apparatus.   The seat belt device according to claim 1 or 2, wherein the retractor is disposed in the seat back.

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