JP6810086B2 - Seat belt device - Google Patents

Description

The present invention relates to a seat belt device.

In the three-point seat belt device, the seat belt is laid diagonally in front of the chest from the upper part of one side of the occupant to the lower part of the other side, and on the waist from one side of the left and right to the other side. By forming a waist belt to be bridged and inserting and engaging the shoulder belt and the tongue connected to the waist belt with the buckle fixed to the vehicle body, the chest and waist of the occupant are restrained, and the occupant moves forward in the event of a vehicle collision. Prevent being thrown into.

In a three-point seatbelt device with such a configuration, the occupant with inertia tries to move forward due to a collision, so if the occupant is excessively restrained by the seatbelt, the burden on the ribs may increase. , Deforms the lower part of the ribs significantly. In order to alleviate this, some recent seatbelt devices are provided with an energy absorption mechanism in the retractor portion so as not to cause excessive restraint. However, since the energy absorption mechanism increases the amount of movement of the occupant, it is generally premised on the combined use with the airbag.

As a three-point seat belt device, the buckle position can be moved forward by separating the seat belt at the buckle part during a collision, and the waist belt (wrap belt) and the shoulder belt (shoulder belt) are separated. There is a known document on a separable buckle (split buckle) that reduces the belt tension acting on the chest without reducing the waist binding force (see Non-Patent Document 1).

Bengt Pipkorn, Francisco J. et al. Lopez-Valdes, Oscar Juste-Lorente, Ricardo Insausti, Christer Lundgren & Cecilia Sunnevang (2016) "Assessment of an innovative seat belt with independent control of the shoulder and lap portions using THOR tests, the THUMS model, and PMHS test", Traffic Injury Presentation, 17: SUP1, pp. 124-130

By the way, the seatbelt device described in Non-Patent Document 1 requires a complicated mechanism for enabling the separation of the waist belt and the shoulder belt.

In consideration of the above circumstances, the present invention can improve the restraint performance of the occupant by the seat belt at the time of a vehicle collision, reduce the burden on the ribs, and reduce the chest deflection without using a complicated mechanism. It is an object of the present invention to provide a seatbelt device.

The present invention is achieved by the following configuration.
(1) A seat belt that has a shoulder belt that extends from the shoulder to the waist of the occupant and a waist belt that hangs on both sides of the occupant on the waist to restrain the occupant.
A buckle device that can engage the tongue provided on the seat belt,
A lap anchor that fixes the end of the seat belt to the vehicle body,
It is a three-point seat belt device equipped with
A seatbelt device characterized in that a boundary portion between the shoulder belt and the waist belt overlaps the waist portion of the occupant when viewed from the front direction of the vehicle when the seatbelt is fastened.
(2) An extension belt whose one end is connected to the belt insertion hole provided in the tongue, and
An intermediate buckle member having a first insertion hole to which the other end of the extension belt is connected and a second insertion hole forming the boundary portion is further provided (1). The seat belt device described.
(3) The seatbelt device according to (2), wherein the intermediate buckle member has a mechanism for suppressing the movement of the belt between the shoulder belt and the waist belt in an emergency such as a vehicle collision. ..
(4) The seatbelt device according to (1), wherein the boundary portion is composed of a constant coupling portion in which the shoulder belt and the waist belt are permanently coupled.
(5) The seatbelt device according to (4), wherein the constant coupling portion is composed of a sewn portion in which the shoulder belt and the waist belt are sewn together.
(6) The tongue is provided at the end of either the shoulder belt or the waist belt.
The boundary portion is composed of a stopper provided at a position separated from the tongue of either the shoulder belt or the waist belt.
The shoulder belt or the other end of the waist belt is provided with a hook member having a belt insertion hole through which the one belt between the tongue and the stopper can be inserted. The seat belt device according to 1).
(7) The seatbelt device according to (6), wherein the hook member has a mechanism for suppressing the movement of the belt between the shoulder belt and the waist belt in an emergency such as a vehicle colliding.
(8) The boundary portion is composed of a belt insertion hole provided in the tongue.
The seatbelt device according to (1), wherein the tongue has a tongue extension portion extending from a locking portion locked to the buckle of the buckle device to a grip portion having the belt insertion hole.
(9) The seatbelt device according to (8), wherein the grip portion has a mechanism for suppressing the movement of the belt between the shoulder belt and the waist belt in an emergency such as a vehicle colliding.
(10) The seatbelt device according to (8) or (9), wherein the tongue extension portion is formed of a flexible material.
(11) The seatbelt device according to any one of (1) to (10), wherein a pretensioner is provided on at least one of the buckle device and the lap anchor.

In the three-point seatbelt device of the present invention, the boundary between the shoulder belt and the waist belt overlaps with the waist of the occupant when viewed from the front of the vehicle when the seatbelt is fastened, so that a complicated mechanism is not used. In the event of a vehicle collision, the seatbelt can improve the restraint performance of the occupant, reduce the burden on the ribs, and reduce the bending of the chest.

It is a front view which looked at the state which attached the seat belt device of 1st Embodiment of this invention from the front of a vehicle. It is a perspective view which shows the main part of the seat belt apparatus shown in FIG. (A) is a schematic view showing the angle formed by the ribs of the occupant of the conventional seatbelt device and the shoulder belt, and (b) is the angle formed by the ribs of the occupant of the seatbelt device of the present embodiment and the shoulder belt. It is a schematic diagram which shows. It is a perspective view of the main part in the state which the seat belt device of the 2nd Embodiment of this invention is attached. It is a perspective view of the main part in the state which the seat belt device of the 3rd Embodiment of this invention is attached. It is a perspective view of the main part in the state which the seat belt device of the 4th Embodiment of this invention is attached. It is a perspective view of the main part in the state which the seat belt device of the 5th Embodiment of this invention is attached. It is a side view which shows by partially breaking the buckle device shown in FIG. It is the main part perspective view in the state which the seat belt device of the modification of this invention is attached.

Hereinafter, embodiments of the three-point seatbelt device of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a front view of the mounted state of the three-point seatbelt device 30 of the present embodiment as viewed from the front of the vehicle. As shown in FIG. 1, the seatbelt device 30 is provided on the seatbelt 31 and the wall portion in the vehicle interior, and is installed below the through anchor 20 and the through anchor 20 that folds the seatbelt 31 near the shoulder of the occupant P. A buckle device 40 to which a retractor 22 that winds up one end side of the seat belt 31, a lap anchor 23 that fixes the other end of the seat belt 31 to the vehicle body, and a tongue 32 attached to the seat belt 31 can be engaged. Mainly prepared.

The seat belt 31 is slanted from the upper left and right sides of the occupant M seated on the seat 25 (the upper left side of the occupant M in the example of the figure) to the lower part on the other side, from the shoulder Ms to the front of the chest and to the lumbar region Mw. It has a shoulder belt 31A and a waist belt 31B that extends from one side of the left and right sides (the left side of the occupant M in the example of the figure) to the other side and extends over both sides of the occupant M to the waist Mw. The shoulder belt 31A and the waist belt 31B Is formed in a band shape with one continuous line. The shoulder belt 31A is guided by the through anchor 20 so that it fits well from the shoulder Ms of the occupant M to the chest. The tongue 32 is provided on the seat belt 31 via an extension belt 31C and an intermediate buckle member 35, which will be described later, and is inserted and locked into the buckle 41 when the belt is attached, so that the intermediate buckle member 35 attaches the seat belt 31 to the shoulder belt. Divide into 31A and waist belt 31B.
As the occupant M in the present embodiment, the AM50 (50th percentile of an American adult male) of the International Unified Side Collision Dummy (World SID) is used, but even if another dummy is applied. Good.

The intermediate buckle member 35 is formed by resin-molding a metal plate, and as shown in FIG. 2, a slit-shaped first insertion hole 35e is provided on one end side, and a slit-shaped first insertion hole 35e is also formed on the other end side. A second insertion hole 35f parallel to the insertion hole 35e of the above is formed. An extension belt 31C having a predetermined length is wound around the first insertion hole 35e, and a seat belt 31 is wound around the second insertion hole 35f, and the shoulder belt 31A and the waist are wound. The boundary portion 33 of the belt 31B is formed.

The extension belt 31C is inserted into the belt insertion hole 32a of the tongue 32 provided on the side opposite to the intermediate buckle member 35 and is connected to the tongue 32. Therefore, the extension belt 31C is detachably configured with respect to the buckle 41. The extension belt 31C extends along the extension line of the waist belt 31B when the seat belt is fastened. As a result, the boundary portion 33 is arranged on the thigh at a position separated by a predetermined distance L from the buckle 41 toward the center of the seat 25 when the seat belt is fastened.

By providing the extension belt 31C in this way, the boundary portion 33 between the shoulder belt 31A and the waist belt 31B is positioned so as to overlap the waist portion Mw of the occupant M when viewed from the front direction of the vehicle when the seat belt is fastened. Arranged (see Figure 1). In particular, the boundary portion 33 located on the lumbar region Mw is arranged at a position where it overlaps with the flat iliac bone Mi occupying the upper part of the hip bone constituting the pelvis when viewed from the skeleton of the occupant M when viewed from the front direction of the vehicle. Will be done.
For example, the left-right position (left-right position line RL) of the boundary portion 33 can be appropriately changed in the range of 50 mm inside the left-right direction of the occupant M to 100 mm outside the left-right direction of the occupant M, centering directly above the thigh. Is.

The length of the extension belt 31C is set in the range of 10 to 20 cm, but is not particularly limited, and the physique of the occupant M and the buckle 41 so that the boundary portion 33 is at the predetermined position described above. It may be adjusted as appropriate depending on the position and the shape of the seat 25.

The boundary portion 33 is located on the lumbar region Mw by the extension belt 31C, and a confirmation means for confirming whether or not the boundary portion 33 is arranged at a position where it overlaps with the iliac bone Mi in the front-rear direction of the vehicle is provided. It may be provided. Specifically, when the occupant gets on board, after detecting that the occupant is sitting by an occupant detection sensor such as a capacitance sensor, the iliac position is specified or assumed by the occupant detection camera in the passenger compartment or the bone density sensor. It is desirable to adjust the buckle 41 and the anchor position according to the physique of the occupant so that the boundary portion 33 is located on the superior anterior ilium in the movable support member.
Further, by registering the seat angle in advance by the occupant, the automatic adjustment support member may be automatically adjusted so that the boundary portion 33 is located on the superior anterior ilium.

Further, the buckle device 40 includes a buckle 41 capable of engaging the tongue 32 and a buckle stay 50 for supporting the buckle 41 so as to be able to return to the original position, and an anchor plate attached to the floor surface on the side of the seat 25. It is attached to the vehicle body via 21. The buckle device 40 may be attached to the side of the seat cushion of the seat 25.

In the seatbelt device configured in this way, in the case of a frontal collision of the vehicle, the occupant M as an inertial body that tries to move forward in the vehicle at the initial stage of the collision passes through the shoulder (clavicle) Ms and the lumbar (pelvic) Mw. It is restrained by the shoulder belt 31A that is hung.
Here, as schematically shown in FIG. 3A, in the conventional seatbelt device, the belt insertion hole of the tongue 32 engaged with the buckle 41, which is the boundary portion 33X between the shoulder belt 31A and the waist belt 31B. Is a position close to the seat 25. Therefore, assuming that the angle formed by the lower part of the rib Mr and the shoulder belt 31A is θ, the angle θ becomes smaller as the occupant M moves forward, and the force in which the rib Mr bends increases.
On the other hand, in the seatbelt device of the present embodiment shown in FIG. 3B, the boundary portion 33 between the shoulder belt 31A and the waist belt 31B becomes the front edge of the iliac Mi, so that even if the occupant M moves. The angle θ is constant and the flexure of the rib Mr is limited between the clavicle and the pelvis. Therefore, it is possible to prevent the boundary portion 33 from biting into the abdomen of the occupant M at the time of a collision, and it is possible to reduce the chest deflection of the occupant M.

As described above, according to the seatbelt device of the present embodiment, the boundary portion 33 between the shoulder belt 31A and the waist belt 31B overlaps with the waist portion Mw of the occupant M when viewed from the front direction of the vehicle when the seatbelt is fastened. By doing so, when the vehicle collides, the load of the seat belt 31 is received by the shoulder Ms and the lumbar Mw of the occupant M, and the burden on the chest can be reduced. As a result, it is possible to sufficiently restrain the occupant's lumbar region Mw by the seat belt at the time of a vehicle collision, reduce the burden on the rib Mr, reduce the chest deflection of the occupant M, and improve the occupant restraint performance. ..

Further, in the present embodiment, the boundary between the extension belt 31C to which one end is connected to the belt insertion hole 32a provided in the tongue 32 and the first insertion hole 35e to which the other end of the extension belt 31C is connected. Since the intermediate buckle member 35 having the second insertion hole 35f constituting the portion 33 is provided, the boundary portion 33 between the shoulder belt 31A and the waist belt 31B is viewed from the front direction of the vehicle when the seat belt is attached. It can be positioned so as to overlap the waist Mw of the occupant M. Therefore, the position of the boundary portion 33 can be appropriately set with a relatively simple configuration including the extension belt 31C and the intermediate buckle member 35 with respect to the existing seatbelt device including the buckle device 40.

In the present embodiment, the intermediate buckle member 35 may have a mechanism for suppressing the movement of the belt between the shoulder belt 31A and the waist belt 31B in an emergency such as a vehicle colliding. That is, a mechanism (for example, a lock member) for locking the belt between the shoulder belt 31A and the waist belt 31B may be arranged in the second insertion hole 35f of the intermediate buckle member 35 in an emergency.

(Second Embodiment)
Next, the seatbelt device according to the second embodiment will be described with reference to FIG. The components that are the same as or correspond to those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 4, the boundary portion 33 of the present embodiment is a sewn portion 38 in which the shoulder belt 31A and the waist belt 31B are sewn together as a constant connecting portion 33F that permanently connects the shoulder belt 31A and the waist belt 31B. It is configured. The belt portion 31D hung from the sewn portion 38 to the tongue 32 extends along the extension line of the waist belt 31B when the seat belt is fastened. Therefore, the boundary portion 33 is located closer to the center of the seat 25 at a predetermined distance L from the buckle 41, as in the first embodiment. With this configuration, the boundary portion 33 can be positioned so as to overlap the lumbar portion Mw of the occupant M, preferably the iliac bone Mi, when viewed from the front direction of the vehicle when the seatbelt is fastened.

Since the boundary portion 33 of the present embodiment is composed of the constant coupling portion 33F in which the shoulder belt 31A and the waist belt 31B are permanently coupled, the position of the boundary portion 33 is fixed by the constant coupling portion 33F. Can be done.

Further, since the boundary portion 33 is formed by the sewn portion 38 in which the shoulder belt 31A and the waist belt 31B are sewn together, the configuration of the boundary portion 33 can be simplified, the number of parts can be reduced, and the productivity can be improved.
Other configurations and operations are the same as those of the first embodiment.

(Third Embodiment)
Next, the seatbelt device according to the third embodiment will be described with reference to FIG. The components that are the same as or correspond to those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 5, a tongue 32 is provided at the end of the shoulder belt 31A, and a position separated from the buckle 41 by a predetermined distance L, that is, a position away from the tongue 32 in the belt thickness direction from the belt surface. A stopper 36 protruding from the belt is provided. On the other hand, at the end of the waist belt 31B, a hook member 37 having a belt insertion hole 37h through which the shoulder belt 31A between the tongue 32 and the stopper 36 can be inserted is provided. The stopper 36 is, for example, a pin-shaped member made of metal and has a size that does not pass through the belt insertion hole 37h.

As a result, in the seatbelt wearing state, the hook member 37 is locked in a state of being in contact with the stopper 36, and the shoulder belt 31A between the tongue 32 and the stopper 36 extends along the extension line of the waist belt 31B and is waisted. Functions as a belt. Further, the boundary portion 33 formed by the contact between the hook member 37 and the stopper 36 can be located on the lumbar portion Mw at a predetermined distance L from the tongue 32.

As described above, according to the present embodiment, the tongue 32 is provided at the end of the shoulder belt 31A and the stopper 36 is provided apart from the tongue 32, and the tongue 32 and the stopper are provided at the end of the waist belt 31B. A hook member 37 having a belt insertion hole 37h through which the shoulder belt 31A between 36 can be inserted is provided. Further, with such a configuration, the boundary portion 33 becomes the position of the belt insertion hole 37h of the hook member 37 positioned by the stopper 36 in the seatbelt wearing state, and overlaps with the waist portion Mw of the occupant M when viewed from the front direction of the vehicle. It can be positioned to overlap the wrap, preferably the iliac Mi.
Other configurations and operations are the same as those of the first embodiment.

In the third embodiment, the tongue 32 and the stopper 36 are provided on the shoulder belt 31A side, and the hook member 37 is provided on the waist belt 31B side. On the contrary, the tongue is provided on the waist belt 31B side. 32 and the stopper 36 may be provided, and the hook member 37 may be provided on the shoulder belt 31A side.

Further, in the third embodiment, the waist belt 31B and the shoulder belt 31A are inserted into one belt insertion hole 37h provided in the hook member 37, but the waist belt 31B and the shoulder belt 31A are inserted separately. The structure may be good.

Further, in the third embodiment, the hook member 37 may have a mechanism for suppressing the movement of the belt between the shoulder belt 31A and the waist belt 31B in an emergency such as a vehicle collision. That is, a mechanism (for example, a lock member) for locking the belt between the shoulder belt 31A and the waist belt 31B may be arranged in the belt insertion hole 37h of the hook member 37 in an emergency.

(Fourth Embodiment)
Next, the seatbelt device according to the fourth embodiment will be described with reference to FIG. The components that are the same as or correspond to those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

As shown in FIG. 6, the boundary portion 33 is composed of a belt insertion hole 32a provided in the grip portion 32b of the tongue 32. The tongue 32 has a longer structure than the conventional one having a tongue extension portion 32g extending from a locking portion 32t locked to the buckle 41 to a grip portion 32b having a belt insertion hole 32a.

In the present embodiment, the tongue 32 has a tongue extension portion 32g extending from the locking portion 32t locked to the buckle 41 to the belt insertion hole 32a, so that the boundary portion 33 is viewed from the front direction of the vehicle. It can be positioned to overlap the lumbar Mw of the occupant M, preferably the iliac Mi.

Further, the tongue extension portion 32g in the present embodiment may be formed of a flexible material such as carbon fiber or FRP (fiber reinforced plastic). As a result, the weight of the enlarged tongue can be reduced.
Other configurations and operations are the same as those of the first embodiment.

Further, in the fourth embodiment, the grip portion 32b may have a mechanism for suppressing the movement of the belt between the shoulder belt 31A and the waist belt 31B in an emergency such as a vehicle collision. That is, a mechanism (for example, a lock member) for locking the belt between the shoulder belt 31A and the waist belt 31B may be arranged in the belt insertion hole 32a of the grip portion 32b in an emergency.

(Fifth Embodiment)
Next, the seatbelt device according to the fifth embodiment will be described with reference to FIGS. 7 and 8. The components that are the same as or correspond to those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified.

In this embodiment, as shown in FIGS. 7 and 8, the buckle device 40 includes a pretensioner 60. In the buckle device 40, the buckle 41 is configured to be self-supporting by a wire 46 passing through the inside of the housing 44 and the hollow cover portion 45. In particular, the wire 46 of the present embodiment is configured to extend outward from an opening (not shown) formed on the base side of the buckle 41. That is, one end of the wire 46 is connected to the piston 61 of the pretensioner 60, and after being hung on the guide portion 48 of the housing 44 and the direction changing portion 47 of the buckle 41, the other end of the wire 46 is outside the cylinder 62. It is fixed to the fixing portion 63 provided in the above and bent so as to form a substantially triangular shape.

Therefore, in an emergency, the high-pressure gas injected from the gas generator 64 of the pretensioner 60 is supplied into the cylinder 62, and the wire 46 is drawn into the cylinder 62 as the piston 61 moves. At this time, since the other end of the wire 46 is fixed to the fixing portion 63 of the cylinder 62, the buckle 41 has the buckle 41 in the inclined direction of the wire 46 extending between the buckle 41 and the housing 44. It is pulled downward from the direction of inclination.

Therefore, in the seatbelt device of the fifth embodiment, the buckle 41 is pulled downward by the pretensioner 60 at the time of a head-on collision with the vehicle, so that the occupant M tries to move forward in the vehicle at the initial stage of the collision and the occupant M tries to move to the front of the vehicle. The submarine phenomenon that digs into 31 is prevented. As a result, the restraint of the shoulder belt 31A hung so as to pass through the shoulder Ms and the lumbar Mw can be maintained, the boundary portion 33 is prevented from biting into the abdomen of the occupant M at the time of a collision, and the chest of the occupant M is prevented. Deflection can be reduced more reliably.

As described above, in the present embodiment, by providing the pretensioner 60 on one end side of the seatbelt 31, it is possible to eliminate the loosening of the seatbelt 31 at the time of a vehicle collision, and the boundary portion 33 is set to the occupant. It can be more reliably positioned on the lumbar region Mw of M.
Other configurations and operations are the same as those of the first embodiment.

In the present embodiment, the pretensioner 60 is provided in the buckle device 40, but the pretensioner of the present invention may be provided in the wrap anchor, or is provided in both the buckle device 40 and the wrap anchor. May be done.
Further, these pretensioners may be operated at the same time at the time of collision, but when the pretensioner is provided on the retractor side, the pretensioner on the buckle device side alone or both the buckle device side and the lap anchor side. It is desirable that the retractor on the retractor side be activated with a delay so that the slug on the upper body is removed immediately after the pretensioners are activated at about the same time to restrain the ilium.
Further, the pretensioner 60 of the present embodiment can also be applied to the seatbelt device of the second to fourth embodiments.

Although each embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified, improved, and the like.
In the above embodiment, the buckle device 40 is configured such that the buckle 41 is self-supporting by using the buckle stay 42, but the buckle 41 may be fixed to the anchor plate 21 or the seat 25 via the buckle belt.
Further, in this case, as shown in FIG. 9, the buckle belt 43 includes the rear belt portion 43A extending along the waist belt 31B and the extension belt 31C, and the anchor plate 21 or the anchor plate 21 in front of the rear belt portion 43A. It may be configured to include a front belt portion 43B fixed to the seat 25 and connected to the buckle 41 or the rear belt portion 43A.
Further, also in this case, as in the fifth embodiment, a pretensioner mechanism (not shown) is provided at the lower end of the front belt portion 43B, and the front belt portion is pulled downward in an emergency by the pretensioner mechanism. Good.

20 Through anchor 30 Seat belt device 31 Seat belt 31A Shoulder belt 31B Waist belt 32 Tongue 32a Belt insertion hole 32g Tongue extension 32t Locking part 33 Boundary 33F Constant coupling part 35 Intermediate buckle member 35e First insertion hole 35f Second Insertion hole 36 Stopper 37 Hook member 37h Belt insertion hole 38 Sewing part 40 Buckle device 41 Buckle 50 Buckle stay 60 Pretensioner M Crew Mi Enterbone Mr Ribbon Ms Shoulder Mw Waist

Claims (10)

A seat belt that restrains the occupant with a shoulder belt that extends from the shoulder to the waist of the occupant and a waist belt that hangs on both sides of the occupant at the waist.
A buckle device that can engage the tongue provided on the seat belt,
A lap anchor that fixes the end of the seat belt to the vehicle body,
It is a three-point seat belt device equipped with
The boundary between the shoulder belt and the waist belt overlaps with the waist of the occupant when viewed from the front of the vehicle when the seat belt is fastened .
At least one of the buckle device or the wrap anchor is provided with a pretensioner having a cylinder, a piston, and a housing connected along the cylinder and provided with a gas generator.
At least one of the buckle device or the wrap anchor is configured to be movable via a wire by the gas generator.
The buckle device or the wrap anchor is pulled downward so that the inclination of the wire extending between the buckle device or the wrap anchor and the housing is reduced in an emergency when the pretensioner is activated. A featured seatbelt device. An extension belt whose one end is connected to the belt insertion hole provided in the tongue, and
An intermediate buckle member having a first insertion hole to which the other end of the extension belt is connected and a second insertion hole forming the boundary portion.
The seatbelt device according to claim 1, further comprising. The seatbelt device according to claim 2, wherein the intermediate buckle member has a mechanism for suppressing the movement of the belt between the shoulder belt and the waist belt in an emergency such as a collision of a vehicle. The seatbelt device according to claim 1, wherein the boundary portion is composed of a constant coupling portion in which the shoulder belt and the waist belt are permanently coupled. The seatbelt device according to claim 4, wherein the constant coupling portion is composed of a sewn portion in which the shoulder belt and the waist belt are sewn together. A seat belt that restrains the occupant with a shoulder belt that extends from the shoulder to the waist of the occupant and a waist belt that hangs on both sides of the occupant at the waist.
A buckle device that can engage the tongue provided on the seat belt,
A lap anchor that fixes the end of the seat belt to the vehicle body,
It is a three-point seat belt device equipped with
The boundary between the shoulder belt and the waist belt overlaps with the waist of the occupant when viewed from the front of the vehicle when the seat belt is fastened.
The tongue is provided at the end of either the shoulder belt or the waist belt.
The boundary portion is composed of a stopper provided at a position separated from the tongue of either the shoulder belt or the waist belt.
Wherein the other one of the end portions of the shoulder belt or the waist belt, you characterized in that the hook member, wherein one of the belt between the said tongue stopper having an insertion possible belt insertion hole is provided Shi Toberuto apparatus. The seatbelt device according to claim 6, wherein the hook member has a mechanism for suppressing the movement of the belt between the shoulder belt and the waist belt in an emergency such as a vehicle colliding. The boundary portion is composed of a belt insertion hole provided in the tongue.
The seatbelt device according to claim 1, wherein the tongue has a tongue extension portion extending from a locking portion locked to the buckle of the buckle device to a grip portion having the belt insertion hole. The seatbelt device according to claim 8, wherein the grip portion has a mechanism for suppressing the movement of the belt between the shoulder belt and the waist belt in an emergency such as a collision of a vehicle. The seatbelt device according to claim 8 or 9, wherein the tongue extension portion is made of a flexible material.

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