JP2007137177A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device improving wearing property of X-type seat belt. <P>SOLUTION: The seat belt device 1 restraining an occupant to a seat is equipped with a three-point type seat belt 2 (20, 21, 22, 23, 24, 25) and a two-point type automatic belt 3 (30, 31, 32, 33, 34, 35, 36, 37, 38). When the engagement of a buckle 25 of the three-point type seat belt 2 with a tongue plate 24 is detected, the two-point type automatic belt 3 is automatically worn so as to intersect with a webbing 20 restraining the upper body of the occupant in the three-point type seat belt 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seatbelt device that improves the mountability of an X-type seatbelt.

Automobiles are equipped with seat belt devices to ensure the safety of passengers during sudden braking and collisions. As a seat belt device, a three-point seat belt is generally provided, and the chest (upper body) of the occupant is restrained by a shoulder belt, and the waist of the occupant is restrained by a lap belt. In the case of a three-point seat belt, the occupant's chest is restrained by a single shoulder belt, so that the surface pressure applied to the occupant's chest increases, and the occupant's chest cannot be restrained evenly on the left and right. In order to solve such problems, there is an X-type seat belt that restrains the chest of an occupant by crossing two shoulder belts (see Patent Document 1). In the case of an X-type seat belt, restraining with two shoulder belts reduces the surface pressure applied to the occupant's chest, and restrains the occupant's chest with a right and left balance in an evenly balanced manner. it can.
JP-A-5-139245

  In the case of the X-type seat belt, since two ends of the two shoulder belts must be fixed, two buckles are required. Therefore, the occupant must insert tongue plates into the two buckles when wearing the seat belt. In addition, since the occupant must place the two shoulder belts in a state where they intersect each other in the vicinity of the center of the chest, it takes time and effort when wearing the seat belt. In this way, the X-type seat belt is poor in wearability and becomes a burden on the occupant each time it gets on and off.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a seat belt device that improves the wearing ability of an X-type seat belt.

  A seat belt device according to the present invention is a seat belt device that restrains an occupant to a seat, and includes a three-point seat belt and a two-point automatic belt, and includes a buckle and a tongue plate of the three-point seat belt. When the engagement is detected, the two-point automatic belt is automatically mounted so as to intersect the webbing that restrains the upper body of the occupant in the three-point seat belt.

  In this seat belt device, when the engagement between the buckle of the three-point seat belt and the tongue plate is detected (that is, when the three-point seat belt is attached), the upper body of the occupant of the three-point seat belt is restrained. A two-point automatic belt is automatically mounted so as to intersect the webbing (shoulder belt). As a result, the two-point automatic belt functions as a shoulder belt, and the chest of the occupant is restrained while intersecting the shoulder belt of the three-point seat belt and the two-point automatic belt, thereby forming an X-type seat belt. become. In order to mount the X-type seat belt, the occupant has only one operation to insert the tongue plate into the buckle, as in the case of a normal three-point seat belt. As described above, this seat belt device is excellent in wearability, reduces the surface pressure applied to the chest of the occupant by the X-type seat belt, and can restrain the occupant in a balanced manner on the left and right.

  In the above-described seat belt device of the present invention, the two-point automatic belt has one end attached to the retractor and the other end connected to a guide rail that crosses the left-right direction of the seat, and the buckle of the three-point seat belt and the tongue plate When the engagement is not detected, the other end of the two-point automatic belt is positioned on the side opposite to the buckle in the left-right direction of the seat, and the engagement between the buckle of the three-point seat belt and the tongue plate is detected. The other end of the point-type automatic belt may move along the guide rail toward the buckle in the left-right direction of the seat, and the webbing of the two-point automatic belt may intersect the webbing of the three-point seat belt.

  In this seat belt device, one end of a two-point automatic belt is attached to a retractor, the other end is connected to a guide rail, and the other end is movable along the guide rail in the left-right direction of the seat. In the seat belt device, when the engagement between the buckle of the three-point seat belt and the tongue plate is not detected, the other end of the two-point automatic belt is located on the opposite side of the buckle side of the three-point seat belt. ing. At this time, the two-point automatic belt is not arranged as a shoulder belt and does not interfere with passengers getting on and off. Further, in the seat belt device, when the engagement between the buckle of the three-point seat belt and the tongue plate is detected, the other end of the two-point automatic belt moves to the buckle side along the guide rail, and the two-point automatic belt. The webbing intersects the webbing of the three-point seat belt. Thus, an X-type seat belt is constituted by the shoulder belt of the three-point seat belt and the two-point automatic belt (shoulder belt).

  The present invention is excellent in wearability, reduces surface pressure applied to the occupant's chest by the X-type seat belt, and is excellent in occupant restraint.

  Hereinafter, an embodiment of a seat belt device according to the present invention will be described with reference to the drawings.

  In the present embodiment, the seat belt device according to the present invention is applied to a seat belt device provided in an automobile. The seat belt device according to the present embodiment constitutes an X-type seat belt by combining a general three-point seat belt with a two-point automatic belt that functions as a shoulder belt. In the seat belt device according to the present embodiment, the chest (upper body) of the occupant is restrained in an X shape by the shoulder belt of the three-point seat belt and the two-point automatic belt, and the waist of the occupant is three-point seat belt. Restrain with the lap belt.

  With reference to FIGS. 1-4, the seatbelt apparatus 1 which concerns on this Embodiment is demonstrated. FIG. 1 is a perspective view of a seat belt device (mounted state) according to the present embodiment. FIG. 2 is a view of the seat belt device (non-mounted state) according to the present embodiment as viewed from the passenger seat side. FIG. 3 is an enlarged perspective view of the guide rate and the movable buckle shown in FIG. FIG. 4 is a configuration diagram of a control unit of the seat belt device according to the present embodiment. 1 and 2 show a case where the seatbelt apparatus according to the present embodiment is installed in a driver's seat, and the seatbelt apparatus installed in the driver's seat will be described.

  The seat belt device 1 mounts an X-type seat belt only by a usual three-point seat belt mounting operation in order to improve the mounting performance as an X-type seat belt. For this purpose, the seat belt device 1 detects the wearing state of the three-point seat belt and automatically attaches the two-point automatic belt when the wearing is confirmed. The seat belt device 1 includes a three-point seat belt 2, a two-point automatic belt 3, and a control unit 4.

  The three-point seat belt 2 is a manual three-point seat belt that is generally installed in an automobile. The three-point seat belt 2 includes a webbing 20, a retractor 21, an outer anchor 22, a shoulder anchor 23, a tongue plate 24, and an inner buckle 25.

  The webbing 20 has one end attached to the retractor 21 and the other end attached to the outer anchor 22. The retractor 21 is fixed below the center pillar SP, and winds and stores the webbing 20 when not mounted. The outer anchor 22 is attached below the center pillar SP, and fixes the other end of the webbing 20. Therefore, the outer anchor 22 serves as a support point on the outer side of the waist of the webbing 20.

  Further, the webbing 20 coming out of the retractor 21 is first passed through the insertion hole of the shoulder anchor 23, and then passed through the insertion hole of the tongue plate 24. The shoulder anchor 23 is attached above the center pillar SP and serves as a support point on the outer side of the shoulder portion of the webbing 20. The tongue plate 24 is a metal fitting for attaching / detaching the three-point seat belt 2, and is inserted into the inner buckle 25 to be engaged therewith. The tongue plate 24 becomes a support point on the inner side of the waist of the webbing 20 when engaged with the inner buckle 25. The inner buckle 25 is a device that is attached to the lower side of the inner side of the seat ST and fixes / detaches the tongue plate 24.

  In the three-point seat belt 2, the occupant's chest is restrained by a shoulder belt 26 formed between a shoulder anchor 23 and a tongue plate 24 of the webbing 20, and a lap belt formed between the tongue plate 24 and the outer anchor 22 of the webbing 20. 27 restrains the occupant's waist. In the three-point seat belt 2, the shoulder belt 26 and the lap belt 27 are arranged at the respective positions when the tongue plate 24 is inserted into the inner buckle 25, and the three-point seat belt 2 is put on.

  The two-point automatic belt 3 is a two-point automatic belt that is automatically mounted so as to intersect the shoulder belt 26 of the three-point seat belt 2 around the center of the chest of the passenger. The two-point automatic belt 3 includes a webbing 30, a retractor 31, a tongue plate 32, a movable buckle 33, a guide rail 34, a wire 35, a drive unit 36, and wire storage units 37 and 38.

  The webbing 30 has one end attached to the retractor 31 and the other end attached to the tongue plate 32. The retractor 31 is fixed below the center pillar SP, and winds and stores the webbing 30 when not mounted. The retractor 31 serves as a support point on the outer side of the waist of the webbing 30. The tongue plate 32 is a metal fitting for attaching / detaching the two-point automatic belt 3, and is inserted into and engaged with the movable buckle 33. The tongue plate 32 serves as a support point on the inner side of the shoulder portion of the webbing 30 when the two-point automatic belt 3 is mounted.

  The movable buckle 33 is a device that fixes / detaches the tongue plate 32. The movable buckle 33 is attached in a state of being suspended from a predetermined portion of the wire 35 in the guide rail 34, and moves along the guide rail 34 as the wire 35 moves. The tongue plate 32 and the movable buckle 33 are for the passenger to release the two-point automatic belt 3 in an emergency. Therefore, the tongue plate 32 and the movable buckle 33 do not need to be detached from the occupant during normal use, and the engaged state is maintained.

  The guide rail 34 is attached to the roof RF and guides the movement of the movable buckle 33. When the webbing 30 moves along with the movable buckle 33, the guide rail 34 moves so that the webbing 30 passes between the equipment in the vehicle such as the handle HD and the passenger sitting on the seat ST. It has an outer shape for guiding. The outer shape of the guide rail 34 has a U-shape with the rear side of the vehicle open, and extends forward from the vehicle with the position slightly on the outer side from the outer side end of the seat ST and slightly on the rear side of the center pillar SP as one end. , Bent toward the center of the vehicle before the sun visor SB and extended toward the center of the vehicle, bent slightly toward the inner side of the inner side of the seat ST, and extended toward the rear of the vehicle slightly beyond the center pillar SP, The position on the inner side slightly from the inner side end of the sheet ST and slightly rearward from the center pillar SP is defined as the other end.

  The guide rail 34 includes a wire 35, and has a cross-sectional shape in which a movable buckle 33 suspended from the wire 35 is movable along the guide rail 34. The cross-sectional shape of the guide rail 34 has a substantially U-shape in which a part of the lower surface is opened, and the open portion of the lower surface has a width that allows the coupling portion 33a of the movable buckle 33 and the wire 35 to pass sufficiently. (See FIG. 3).

  A lock mechanism (not shown) for fixing the movable buckle 33 is provided at each end of the guide rail 34. This locking mechanism automatically locks the movable buckle 33 when the movable buckle 33 moves, and automatically releases the locked state when the movable buckle 33 starts to move in the reverse direction.

  The wire 35 is disposed over the entire area in the guide rail 34 and is held at the approximate center in the guide rail 34. The wire 35 is driven so as to move along the guide rail 34 by the drive unit 36. One end of the wire 35 coming out from the outer side end portion of the guide rail 34 is housed in the wire housing portion 37, and the other end of the wire 35 coming out from the inner side end portion of the guide rail 34 is housed in the wire housing portion 38. The The wire storage portions 37 and 38 wind up and store the wire 35, respectively, and always hold the wire 35 in a stretched state.

  The drive unit 36 is disposed between the outer end of the guide rail 34 and the wire storage unit 37 and is attached to the roof RF. The drive unit 36 passes through the wire 35 and moves the wire 35 in the vehicle front-rear direction. The drive unit 36 includes a motor 36a and a mechanism for moving the wire 35 in the vehicle front-rear direction by the rotational driving force of the motor 36a. The rotation drive of the motor 36a is controlled by the control unit 4.

  When the two-point automatic belt 3 is not attached, the movable buckle 33 is fixed by a lock mechanism at the outer end of the guide rail 34. Therefore, the webbing 30 extends substantially upward from the retractor 31 and is disposed along the center pillar SP (see FIG. 2). At this time, the three-point seat belt 2 is also not attached, and the three-point seat belt 2 and the two-point automatic belt 3 are substantially parallel. Therefore, there is no problem for passengers to get on and off.

  When the two-point automatic belt 3 is attached, the movable buckle 33 is fixed by a locking mechanism at the inner end of the guide rail 34. Therefore, the webbing 30 extends from the retractor 31 to the upper side on the inner side of the sheet ST, and is disposed so as to cross the sheet ST from below to above (see FIG. 1). At this time, the three-point seat belt 2 is also mounted, and the webbing 20 (shoulder belt 26) of the three-point seat belt 2 and the webbing 30 of the two-point automatic belt 3 intersect to form an X-type seat belt. To do.

The control unit 4 attaches the two-point automatic belt 3 based on the attachment / non-attachment of the three-point seat belt 2 (specifically, engagement / disengagement between the tongue plate 24 and the inner buckle 25). / Control non-wearing. When detecting the engagement between the tongue plate 24 and the inner buckle 25, the control unit 4 moves the movable buckle 33 from the outer side end portion of the guide rail 34 to the inner side end portion. Further, when detecting the disengagement between the tongue plate 24 and the inner buckle 25, the control unit 4 moves the movable buckle 33 from the inner side end of the guide rail 34 to the outer side end. The control unit 4 includes a motor 36a, a buckle attachment / detachment detection sensor 40, and an ECU [Electronic Control Unit] 41. The buckle attachment / detachment detection sensor 40 is in an attachment / detachment state (engaged / disengaged) between the tongue plate 24 and the inner buckle 25. ). The buckle attachment / detachment detection sensor 40 detects engagement / disengagement between the tongue plate 24 and the inner buckle 25 and transmits a buckle attachment / detachment signal indicating the engagement / disengagement to the ECU 41.

  The ECU 41 includes a CPU [Central Processing Unit], a ROM [Read Only Memory], a RAM [Random Access Memory], and the like, and controls the driving of the motor 36a in the driving unit 36. The ECU 41 receives a buckle attachment / detachment signal from the buckle attachment / detachment detection sensor 40 at regular time intervals. When the ECU 41 receives a buckle attachment / detachment signal indicating engagement between the tongue plate 24 and the inner buckle 25, the ECU 41 moves the movable buckle 33 from the outer side end of the guide rail 34 to the inner side end. A motor control signal for driving the wire 35 forward is set and transmitted to the motor 36a. When the ECU 41 receives a buckle attachment / detachment signal indicating non-engagement between the tongue plate 24 and the inner buckle 25, the ECU 41 moves the movable buckle 33 from the inner side end of the guide rail 34 to the outer side end. A motor control signal for driving the wire 35 is set behind and transmitted to the motor 36a.

  When the motor 36a receives a motor control signal for driving the wire 35 forward of the vehicle from the ECU 41, the motor 36a rotates and drives in a direction for driving the wire 35 forward of the vehicle for a predetermined time. On the other hand, when the motor 36a receives a motor control signal for driving the wire 35 to the rear of the vehicle from the ECU 41, the motor 36a is rotationally driven in a direction for driving the wire 35 to the rear of the vehicle for a predetermined time. The predetermined time is determined based on the rotational speed (constant) of the motor 36a (and eventually the moving speed of the wire 35), and the movable buckle 33 (wire 35) is driven by the rotational drive of the motor 36a. This is the time required to move between the side edges.

  The operation of the seat belt device 1 will be described with reference to FIGS. Here, the operation when the driver gets on and the operation when the driver gets off will be described.

  The operation when the driver gets on will be described. Before the driver is seated on the seat ST, the webbing 20 of the three-point seat belt 2 is disposed along the center pillar SP. In the two-point automatic belt 3, the movable buckle 33 is locked by a locking mechanism at the outer end of the guide rail 34, and the webbing 30 is disposed along the center pillar SP. Therefore, the driver sits on the seat ST without the three-point seat belt 2 and the two-point automatic belt 3 getting in the way.

  After sitting, the driver pulls out the webbing 20 from the retractor 21 with the tongue plate 24 in one hand. Then, the driver inserts the tongue plate 24 into the inner buckle 25 and engages it. Then, the buckle attachment / detachment detection sensor 40 detects this engagement and transmits a buckle attachment / detachment signal indicating the engagement to the ECU 41. Here, the three-point seat belt 2 is attached by an operation by the driver.

  Upon receiving this buckle attachment / detachment signal, the ECU 41 transmits a motor control signal for driving the wire 35 forward of the vehicle to the motor 36a. When this motor control signal is received, in the drive unit 36, the motor 36a rotates in a direction to drive the wire 35 forward of the vehicle, and drives the wire 35 in the forward direction of the vehicle via the wire drive mechanism. Then, the wire 35 starts to move in the forward direction of the vehicle on the outer side of the guide rail 34, and the movable buckle 33 fixed to the outer side end portion of the guide rail 34 also starts to move as the wire 35 moves. At this time, the lock mechanism of the outer end portion of the guide rail 34 is unlocked.

  The motor 36a continues to rotate for a predetermined time, and the movement of the wire 35 continues during that time. At this time, the wire storage unit 37 feeds the wire 35 and the wire storage unit 38 winds the wire 35. Along with this, the movable buckle 33 moves along the guide rail 34 toward the front of the sun visor SB on the outer side, bends toward the center of the vehicle at this position, and from the inner side end of the seat ST. The vehicle moves slightly toward the inner side toward the inner side, bends toward the rear of the vehicle at this position, and moves toward the rear of the vehicle slightly toward the rear side of the center pillar SP. As the movable buckle 33 moves, the webbing 30 is pulled out of the retractor 31, and the webbing 30 also moves. At this time, the webbing 30 passes between a member such as the handle HD in the passenger compartment and the driver, and does not contact the member in the passenger compartment and the driver.

  Eventually, the movable buckle 33 reaches the inner end of the guide rail 34. At this time, the motor 36a stops. The movable buckle 33 is locked by the locking mechanism of the guide rail 34 and is fixed in position. Here, the two-point automatic belt 3 is mounted by automatic operation, and the webbing 30 of the two-point automatic belt 3 intersects the webbing 20 of the three-point seat belt 2. As a result, the driver restrains the chest (upper body) in an X shape by the shoulder belt 26 of the three-point seat belt 2 and the two-point automatic belt 3, and the waist by the lap belt 27 of the three-point seat belt 2. Is restrained.

  The operation when the driver gets off will be described. Before the driver gets off, the three-point seat belt 2 and the two-point automatic belt 3 are mounted, and the driver is restrained. At this time, the two-point automatic belt 3 is disposed so as to cross the shoulder belt 26 of the three-point seat belt 2 with the movable buckle 33 locked by the locking mechanism at the inner end of the guide rail 34.

  When getting off the vehicle, the driver first operates the inner buckle 25 to release the engagement between the tongue plate 24 and the inner buckle 25. Then, the buckle attachment / detachment detection sensor 40 detects the disengagement and transmits a buckle attachment / detachment signal indicating the disengagement to the ECU 41. Here, the fixing of the tongue plate 24 in the three-point seat belt 2 is released by an operation by the driver. However, since the two-point automatic belt 3 intersects the shoulder belt 26 of the three-point seat belt 2, the driver can use the tongue plate until the two-point automatic belt 3 is completely removed. The state is maintained with 24 held. Therefore, the webbing 20 is hardly wound on the retractor 21.

  Upon receiving this buckle attachment / detachment signal, the ECU 41 transmits a motor control signal for driving the wire 35 to the rear of the vehicle to the motor 36a. When this motor control signal is received, in the control unit 4, the motor 36 a is rotationally driven in the direction for driving the wire 35 to the rear of the vehicle, and the wire 35 is driven in the rearward direction of the vehicle via the wire driving mechanism. Then, on the outer side of the guide rail 34, the wire 35 begins to move in the rearward direction of the vehicle, and as the wire 35 moves, the movable buckle 33 fixed to the inner side end of the guide rail 34 also begins to move. At this time, the lock mechanism of the inner side end of the guide rail 34 is unlocked.

  The motor 36a continues to rotate for a predetermined time, during which the movement of the wire 35 continues. At this time, the wire storage unit 37 winds up the wire 35 and the wire storage unit 38 sends out the wire 35. Accordingly, the movable buckle 33 moves along the guide rail 34 toward the front of the sun visor SB on the inner side, bends in the outer direction at this position, and slightly from the outer side end of the seat ST. The vehicle moves in the outer direction to the outer side, bends in the vehicle rearward direction at this position, and moves in the vehicle rearward direction slightly to the rear side from the center pillar SP. As the movable buckle 33 moves, the webbing 30 is wound around the retractor 31 and the webbing 30 also moves. At this time, the webbing 30 passes between a member such as the handle HD in the vehicle interior and the driver, and does not contact the member in the vehicle interior and the driver.

  Eventually, the movable buckle 33 reaches the outer end of the guide rail 34. At this time, the motor 36a stops. The movable buckle 33 is locked by the locking mechanism of the guide rail 34 and is fixed in position. Here, the attachment of the two-point automatic belt 3 is released by automatic operation, and the webbing 30 is disposed along the center pillar SP. In this state, the driver releases the tongue plate 24 that has been held. Then, the webbing 20 is wound around the retractor 21 and the wearing of the three-point seat belt 2 is completely released. Accordingly, the webbing 20 of the three-point seat belt 2 is disposed along the center pillar SP. Therefore, the driver gets off the vehicle without getting in the way of the three-point seat belt 2 and the two-point automatic belt 3.

  In this seat belt device 1, the two-point automatic belt 3 is automatically mounted so as to cross the shoulder belt 26 in accordance with the mounting of the three-point seat belt 2 by one operation with one hand of the driver. Thus, an X-type seat belt can be attached. In addition, the seat belt device 1 releases the X-type seat belt by automatically releasing the two-point automatic belt 3 in response to the release of the three-point seat belt 2 by a single operation of the driver. can do. As described above, according to the seat belt device 1, the X-type seat belt can be mounted / unmounted by a simple operation, and the mounting performance as the X-type seat belt is excellent.

  Further, in the seat belt device 1, since the occupant's chest is restrained by two shoulder belts, the surface pressure applied to the occupant is ½ that of the conventional one, so that the person can be restrained gently, and the chest resistance value (ribs) It is also good for people with low fracture load. Further, in the seat belt device 1, the occupant's chest is restrained by intersecting with the two shoulder belts, so that the occupant's chest can be restrained equally in the right and left directions.

  As mentioned above, although embodiment which concerns on this invention was described, this invention is implemented in various forms, without being limited to the said embodiment.

  For example, in the present embodiment, the case where the seat belt device according to the present invention is applied to a driver's seat has been described, but the present invention can also be applied to a passenger seat and a rear seat.

  In the present embodiment, one end of the two-point automatic belt is fixed to a predetermined portion of the wire, and the wire is driven by a motor so that one end of the two-point automatic belt is moved and attached. Other methods may be used for the automatic mounting method of the point type automatic belt.

  In this embodiment, the movable buckle is configured to be locked by a locking mechanism provided on the guide rail. However, other locking methods such as locking on the motor side may be used.

  Further, in the present embodiment, the outer shape of the guide rail is U-shaped, but it is sufficient that the two-point automatic belt can be moved so as not to come into contact with passengers or members in the passenger compartment. An outer shape such as a V shape may be used.

  In this embodiment, one end of the two-point automatic belt is detachable with a tongue plate and a movable buckle. However, one end may be directly attached to the wire in the guide rail and may not be detachable.

It is a perspective view of the seatbelt device (mounted state) concerning this embodiment. It is the figure which looked at the seatbelt apparatus (non-wearing state) which concerns on this Embodiment from the passenger seat side. It is an expansion perspective view of a guide rail and a movable buckle shown in FIG. It is a block diagram of the control part of the seatbelt apparatus which concerns on this Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Seat belt apparatus, 2 ... Three-point seat belt, 3 ... Two-point automatic belt, 4 ... Control part, 20 ... Webbing, 21 ... Retractor, 22 ... Outer anchor, 23 ... Shoulder anchor, 24 ... Tongue plate, 25 ... inner buckle, 26 ... shoulder belt, 27 ... lap belt, 30 ... webbing, 31 ... retractor, 32 ... tongue plate, 33 ... mobile buckle, 33a ... coupling part, 34 ... guide rail, 35 ... wire, 36 ... drive Part, 36a ... motor, 37, 38 ... wire storage part, 40 ... buckle attachment / detachment detection sensor, 41 ... ECU

Claims (2)

A seat belt device for restraining an occupant to a seat,
A three-point seat belt,
With a two-point automatic belt,
When the engagement between the buckle of the three-point seat belt and the tongue plate is detected, the two-point automatic belt is automatically mounted so as to intersect the webbing that restrains the upper body of the passenger in the three-point seat belt. A seat belt device characterized in that: The two-point automatic belt has one end attached to the retractor and the other end connected to a guide rail that crosses the left-right direction of the seat,
When the engagement between the buckle of the three-point seat belt and the tongue plate is not detected, the other end of the two-point automatic belt is located on the opposite side of the buckle in the left-right direction of the seat,
When the engagement between the buckle of the three-point seat belt and the tongue plate is detected, the other end of the two-point automatic belt moves toward the buckle in the left-right direction of the seat along the guide rail. 2. The seat belt device according to claim 1, wherein the webbing of the automatic belt intersects the webbing of the three-point seat belt.

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