JP2020006918A - Buckle device and seat belt device comprising the same - Google Patents

Abstract

To provide a buckle device capable of improving performance for binding an occupant by a seat belt, while reducing a burden on a lower region of ribs and the abdominal region at the time of vehicle collision, and a seat belt device comprising the same.SOLUTION: A buckle device 40 comprises: a buckle body part 41 that can be fitted with a tongue 32 provided for a seat belt 31; a buckle stay 50 for supporting the buckle body part 41; and a drive mechanism 60 for driving the buckle stay 50 in an emergency. The buckle stay 50 is constituted to perform second turning movement in the direction of getting close to an occupant M, after the buckle body part 41 performs first turning movement in the direction of getting away from the regularly-seated occupant M.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a buckle device and a seat belt device provided with the buckle device.

  In the three-point type seat belt device, the seat belt is laid diagonally in front of the chest from the upper part on one side of the left and right sides of the occupant to the lower part on the other side, and on the waist from one side on the left side to the other side. The occupant's chest and waist are restrained by forming a waist belt to be bridged and inserting and engaging the tongues connected to the shoulder belt and the waist belt with the buckle fixed to the vehicle body, so that an emergency such as in the event of a vehicle collision can be restrained. Sometimes prevents the occupant from being thrown forward.

  In the three-point seat belt device having such a configuration, the occupant having inertia tries to move forward due to the collision, so that the slack of the belt is removed and the buckle of the seat belt is released when the vehicle suddenly decelerates. 2. Description of the Related Art A pretensioner configured to be retracted is known (for example, see Patent Document 1).

  Further, as a three-point seat belt device, the buckle position can be moved forward by separating the seat belt at the buckle portion during a collision, and the waist belt (lap belt) and the shoulder belt (shoulder belt) are separated. There is known a document related to a separation type buckle (split buckle) in which the belt tension acting on the chest is reduced without reducing the waist restraining force (see Non-Patent Document 1).

International Publication No. 2008/155942

Bengt Pipcorn, 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 Prevention, 17: Sup1, pp. 124-130

  If the occupant is excessively restrained by the seat belt, the burden on the ribs, the lower part of the ribs, the abdomen, and the like increases. For this reason, in the seatbelt device, it is required that the load on the occupant be reduced by restraining the skeleton in which the seatbelt hardly deforms at an early stage. That is, in the three-point seat belt device, it is desired that the seat belt restrain the clavicle and the iliac efficiently.

  However, the pretensioner described in Patent Literature 1 retracts the buckle along the direction of inclination of the wire to which the buckle is attached, and further efficient seatbelt restraint is required. Further, the seatbelt device described in Non-Patent Document 1 requires a complicated mechanism for enabling separation of the waist belt and the shoulder belt.

  The present invention has been made in consideration of the above circumstances, and in a vehicle collision, a buckle device capable of improving a restraint performance of an occupant by a seat belt while reducing a burden on a lower part and an abdomen of ribs, and a seat belt device including the same. The purpose is to provide.

The present invention is achieved by the following configurations.
(1) a buckle body to which a tongue provided on a seat belt can be attached;
A buckle stay that supports the buckle body,
A buckle device comprising:
The buckle stay is configured such that the buckle body portion performs a first turning movement in a direction away from a properly seated occupant, and then performs a second turning movement in a direction approaching the occupant. .
(2) A seat belt device provided with the buckle device according to (1).

  According to the buckle device and the seatbelt device of the present invention, in an emergency, the buckle body first makes a first turning movement in a direction away from a properly seated occupant, and then performs a second turning in a direction approaching the occupant. By moving the waist belt over the upper anterior iliac spine, it is possible to improve the restraint performance of the occupant by the seat belt while reducing the burden on the lower part and abdomen of the ribs at the time of a vehicle collision. .

It is a side view showing the seat belt device in which the buckle device of a 1st embodiment of the present invention was incorporated. FIG. 2 is a view corresponding to FIG. 1 after driving a buckle stay by a driving mechanism of the buckle device. It is a side view which shows the buckle apparatus in the state before a buckle stay is driven. It is a side view which shows the buckle apparatus in the state where the buckle stay is driving. FIG. 9 is a side view showing the buckle device in a state where driving of the buckle stay is completed. It is a side view showing a seat belt device in which a buckle device of a second embodiment of the present invention is incorporated. FIG. 5 is a view corresponding to FIG. 4 after driving a buckle stay by a driving mechanism of the buckle device. It is a side view showing the buckle device of the 1st modification from which a drive mechanism differs, (a) shows the state before the buckle stay is driven, and (b) shows the state where the buckle stay has been driven. It is a side view showing the buckle device of the 2nd modification from which a drive mechanism differs, (a) shows the state before the buckle stay is driven, and (b) shows the state where the drive of the buckle stay is completed. It is a side view showing the buckle device of the 3rd modification from which a drive mechanism differs. It is a side view showing the buckle device of the 4th modification which drives a buckle stay so that a buckle main part may draw another movement locus.

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

(1st Embodiment)
FIG. 1 is a side view of the three-point seat belt device 30 according to the present embodiment in a mounted state. As shown in FIG. 1, the seat belt device 30 is provided on a seat belt 31, a wall portion in a vehicle compartment, and a through anchor 20 that turns the seat belt 31 near the shoulder of the occupant M, and is installed below the through anchor 20. A retractor 22 that winds one end of the seat belt 31, a lap anchor 23 that fixes the other end of the seat belt 31 to the vehicle body, a buckle device 40 to which a tongue 32 attached to the seat belt 31 can be attached, Mainly equipped.

The seatbelt 31 obliquely extends from one upper part on one of the left and right sides (upper left part of the occupant M in the example in the figure) to the lower part on the other side, from the shoulder part Ms to the waist part Mw through the front of the chest and from the upper part on the left side. It has a shoulder belt 31A and a waist belt 31B which extends from one side (left side of the occupant M in the example of the figure) to the other side on the waist Mw on both sides of the occupant M. The shoulder belt 31A and the waist belt 31B Are formed in a band shape by one continuous line. The shoulder belt 31 </ b> A is guided by the through anchor 20 so that the shoulder belt Ms of the occupant M fits well from the shoulder Ms. The tongue 32 has an insertion hole 32 a through which the seat belt 31 can be inserted, and is provided movably on the seat belt 31. The tongue 32 is attached to the buckle device 40 when the belt is worn, so that the tongue 32 divides the seat belt 31 into a shoulder belt 31A and a waist belt 31B.
As the occupant M in the present embodiment, an internationally unified side impact dummy (World SID) AM50 (50th percentile of an adult male in the United States) is used, but other dummies may be applied. Good.

  3A, the buckle device 40 includes a buckle body 41 to which the tongue 32 can be attached, a buckle stay 50 that supports the buckle body 41, and a driving mechanism that drives the buckle stay 50 in an emergency. 60.

  The buckle stay 50 is connected to a first link 51 connected to the buckle body 41 and a second link connected to the first link 51 and rotatably attached to a first fixing portion 52 provided on the vehicle body or the seat 25. A link 53 and a second fixing portion 54 provided on the vehicle body or the seat 25 and supporting the first link 51 so as to be movable and rotatable along the longitudinal direction thereof are provided.

  Specifically, the first fixing portion 52 and the second fixing portion 54 of the present embodiment are configured by a shaft member, and the first link 51 and the second link 53 are attached to the connection shaft 55 so as to be relatively rotatable. Have been. The first link 51 is formed to be longer than the second link 53, and the first link 51 is formed with an elongated hole 56 for guiding the second fixing portion 54 along the longitudinal direction.

  In the present embodiment, the first fixing portion 52 and the second fixing portion 54 are provided on the seat frame cover 28 disposed on the side of the seat back 26 and the seat cushion 27 that constitute the seat 25. However, the present invention is not limited to this, and may be provided directly on the seat back 26 or the seat cushion 27, or may be provided on a member on the vehicle body side.

  Further, the driving mechanism 60 includes a plurality of balls 62 driven by gas pressure of a gas generator 61 generated in an emergency, a tube 63 accommodating the plurality of balls 62, and a shaft member serving as the second fixing portion 54. A pretensioner provided with a pinion 64 that rotates integrally with the second link 53 by engaging with the ball 62.

  Therefore, in an emergency, the drive mechanism 60 rotates the second link 53 around the first fixed portion 52 and moves and rotates the first link 51 with respect to the second fixed portion 54 by the link mechanism. By driving a certain buckle stay 50, the buckle main body 41 makes a first turning movement in a direction away from the occupant M who is properly seated, and then makes a second turning movement in a direction approaching the occupant M.

Specifically, the drive mechanism 60 drives the buckle stay 50 in an emergency such that the angle θ between the first link 51 and the second link 53 temporarily becomes 180 ° (see FIG. 3B). Then, the buckle main body 42 is moved upward and forward by the first pivotal movement and then downwardly and backwardly by the second pivotal movement (see FIG. 3C). That is, the first link 51 and the second link 53 are linearly extended from the bent state, and are bent in opposite directions so that the angle θ is increased.
Note that in FIG. 3A~ Figure 3C, reference numeral _{T 1} is driven by the drive mechanism 60, represents the locus of movement of the buckle main body 41, reference numeral _{T 2} are represent the movement locus of the connecting shaft 55.

  Therefore, in an emergency, that is, when a collision of the vehicle is detected by a collision sensor (not shown) or the like, the high-pressure gas injected from the gas generator 61 is supplied into the tube 63 to move the ball 62 in the tube 63. Then, the pinion 64 is rotated. Thereby, the second link 53 rotates together with the pinion 64, and the first link 51 and the second link 53 move so as to be temporarily linear with each other. At that time, the buckle main body 41 pivots upward and forward together with the tongue 32. Then, further rotation of the second link 51 causes the buckle main body 41 to pivot downward and backward together with the tongue 32. Therefore, the buckle stay 50 moves the buckle body 41 downward as compared to the state before the driving of the drive mechanism 60, and moves the buckle body 41 backward in the vehicle front-rear direction so as to return by the amount moved forward. ing. That is, the buckle body 41 after driving does not fluctuate greatly in the vehicle front-rear direction, and in the present embodiment, is located forward of before driving.

  In addition, since the buckle stay 50 pivots upward and forward once, the insertion hole 32a of the tongue 32, which is the boundary between the shoulder belt 31A and the waist belt 31B, is once lifted onto the iliac bone Mi to hook the iliac bone Mi. . Thereafter, the buckle stay 50 pivots downward and rearward, so that the waist belt 31B is pulled downward and rearward while being stretched over the upper anterior iliac spine (ASIS) Mia. In addition, the iliac bone Mi is a flat portion occupying the upper part of the hip bone constituting the pelvis, and the superior anterior iliac spine Mia refers to a protrusion at the front edge of the iliac crest.

  In this state, at the time of a vehicle collision, the occupant M who is going to move forward in the vehicle is restrained by the waist belt 31B stretched over the upper anterior iliac spine Mia, and the waist belt 31B bites into the abdomen of the occupant M. Is prevented. In addition, since the buckle main body 41 does not fluctuate greatly in the vehicle front-rear direction when the driving is completed, the burden on the lower part of the rib can be reduced.

  Also, as shown in FIG. 1, even when the waist belt 31B is passing through the abdomen of the occupant M depending on the physique and sitting posture of the occupant M, the buckle stay 50 temporarily turns upward and forward, so that The waist belt 31B can be easily moved from the position where the abdomen is restrained to the position where it is stretched over the superior anterior iliac spine Mia.

  As a result, in the present embodiment, it is possible to improve the restraint performance of the occupant by the seat belt while reducing the burden on the lower part and the abdomen of the ribs at the time of a vehicle collision.

(2nd Embodiment)
Next, a seat belt device according to a second embodiment will be described with reference to FIGS. Note that components that are the same as or correspond to those of the first embodiment are given the same reference numerals, and descriptions thereof are omitted or simplified.

  As shown in FIG. 4, in the second embodiment, one end of an extension belt 31C having a predetermined length is wound around the insertion hole 32a of the tongue 32. The other end of the extension belt 31C is inserted into one insertion hole 35a of the intermediate buckle 35, the seat belt 31 is inserted into the other insertion hole 35b of the intermediate buckle 35, and the shoulder belt 31A And a waist belt 31B.

Thereby, in the present embodiment, as shown in FIG. 5, the drive mechanism 60 drives the buckle stay 50 constituted by the link mechanism, so that the intermediate buckle 35 is positioned on the iliac bone Mi when viewed from the vehicle front direction. It can be located forward. When the buckle stay 50 further moves downward and backward from this state, the waist belt 31B is stretched over the upper anterior iliac spine Mia, and the occupant M tries to move forward in the vehicle. Since the occupant M is more reliably restrained by the clavicle and the iliac, the load on the ribs and the lower part of the ribs can be reduced. As a result, the chest deflection of the occupant M can be reduced, and the occupant restraint performance can be further improved.
Other configurations and operations are the same as those of the first embodiment.

  As described above, each embodiment of the present invention has been described, but the present invention is not limited to each embodiment described above, and modifications, improvements, and the like can be appropriately made.

  In the above embodiment, a pretensioner that drives a pinion by a ball is used as the drive mechanism 60, but the drive mechanism 60 of the present invention is not limited to this. For example, as in a first modification shown in FIG. 6, the drive mechanism 60A may be a pretensioner provided with a rack and pinion. That is, the driving mechanism 60A is provided around the rack 71 driven by the gas pressure of the gas generator 70 generated in an emergency, and the shaft member that is the first fixed portion 52, and meshes with the rack 71 to form the second link. A pretensioner including a pinion 72 that rotates integrally with the pinion 53 may be used.

  Further, as in a second modification shown in FIG. 7, the drive mechanism 60B may be a pretensioner provided with a wire as a retracting member. That is, the drive mechanism 60B is configured by connecting a piston 81 that is operated by gas pressure of a gas generator 80 generated in an emergency, a cylinder 82 that slidably accommodates the piston 81, a first link 51, and a second link 53. A pretensioner including a connecting shaft 55 to be connected to the piston 81 and a wire 83 serving as a retracting member that is retracted by the piston 81 in an emergency may be used.

Although not shown, the wire 83 may be provided with a return prevention mechanism for preventing the wire 83 from moving in the cylinder 82 in a direction opposite to a direction in which the piston 81 retracts in an emergency. Accordingly, it is possible to more reliably prevent the buckle stay 50 constituting the link mechanism from being driven in the reverse direction.
A mechanism for preventing the buckle stay 50 from being driven in the reverse direction may be provided in any of the driving mechanisms 60 and 60A.

  Further, as in a third modification shown in FIG. 8, the driving mechanism 60C rotates the shaft member, which is the first fixing portion 52, directly or indirectly via a gear or the like, thereby forming the second link 53. May be configured integrally with a motor 90 that drives the buckle stay 50 formed of a link mechanism.

  Further, the present invention includes a load measuring means for measuring a belt load acting on the seat belt. In an emergency, when the belt load falls below the first threshold value while the drive mechanism 60 is being driven, The configuration may be such that the driving of 60 is stopped. Normally, after the waist belt 31B is stretched over the upper anterior iliac spine Mia by the drive of the drive mechanism 60, the belt load gradually increases. However, when the drive mechanism 60 is driven, the lumbar belt 31B may come off the upper iliac spine Mia of the occupant M depending on the physique and sitting posture of the occupant M. In this state, the drive mechanism 60 It is desirable to stop the driving so as not to increase the belt load of the waist belt 31B. For this reason, when the belt load falls below the first threshold, the driving of the driving mechanism 60 may be stopped.

  Further, the present invention includes a load measuring means for measuring a belt load acting on the seat belt, and when the belt load at the time of wearing the seat belt is higher than the second threshold, driving of the link mechanism is stopped in an emergency. You may. That is, when the belt load is higher than the second threshold value in a state where the seat belt is worn, it can be determined that the lumbar belt 31B has already been stretched over the superior anterior iliac spine Mia. In an emergency, it is also possible to control not to drive the link mechanism.

In the above-described embodiment, the buckle stay 50 is driven so as to draw a locus T _{1 in} which the buckle main body 41 firstly moves upward and forward and then downwardly and backwardly secondly. However, the present invention is not limited to this. That is, the first turning movement may be any moving upward from the initial position, and the second turning movement is moving downward after the first turning movement. I just need.
The buckle stay 50 is not limited to the link mechanism of the above-described embodiment, and may be configured by another mechanism as long as the buckle body 41 is moved in this manner.

Further, in the present invention, it is sufficient that the buckle main body 41 moves downward with respect to the position before driving. For example, as shown in FIG. 9, the buckle stay 50 is in the process of the buckle main body 41 is moved downward, the locus T ₁ such as to move back and forth (i.e., the buckle main body 41, seated in a regular (The first turning movement forward and downward away from the occupant M), and then the second turning movement rearward and downward toward the occupant M).

  Further, in the above-described embodiment, the case where the seat belt device 30 including the buckle device 40 is applied to the front seat of the driver's seat or the passenger seat is described, but the present invention may be applied to the rear seat.

As described above, the following items are disclosed in this specification.
(1) a buckle body to which a tongue provided on a seat belt can be attached;
A buckle stay that supports the buckle body,
In an emergency, a drive mechanism for driving the buckle stay,
A buckle device comprising:
The buckle stay is configured such that the buckle body portion performs a first turning movement in a direction away from a properly seated occupant, and then performs a second turning movement in a direction approaching the occupant. .
According to this configuration, in an emergency, after the buckle body portion makes the first turning movement in a direction away from the occupant who is properly seated, the buckle body is second turned in a direction approaching the occupant, and the waist belt is lifted. Since it can be extended over the anterior iliac spine, it is possible to improve the restraint performance of the occupant by the seat belt while reducing the burden on the lower ribs and the abdomen during a vehicle collision.

(2) The buckle device according to (1), wherein the first turning movement of the buckle main body moves upward from an initial position.
According to this configuration, in an emergency, the buckle main body is moved upward from the initial position, so that even when the waist belt is passing through the abdomen of the occupant, the waist belt is moved and the upper forehead is moved. It can be reliably applied to the osteophyte.

(3) The buckle device according to (2), wherein the second turning movement of the buckle main body moves downward after the first turning movement.
According to this configuration, in an emergency, after the buckle body is pivoted upward and then pivoted downward, the waist belt can be stretched over the upper anterior iliac spine, so that in the event of a vehicle collision, Thus, the load on the lower ribs and the abdomen can be reduced, and the performance of restraining the occupant by the seat belt can be improved.

(4) The buckle stay is connected to the first link connected to the buckle body, and a second link connected to the first link and rotatably attached to a first fixing portion provided on a vehicle body or a seat. A link mechanism provided on the vehicle body or the seat, the link mechanism including a link, and a second fixing portion that rotatably supports the first link along a longitudinal direction thereof and that rotatably supports the first link.
The drive mechanism rotates the second link around the first fixing portion and moves and rotates the first link with respect to the second fixing portion in the emergency, whereby the buckle body portion The buckle device according to any one of (1) to (3), wherein the buckle device is configured to perform the second turning movement after the first turning movement.
According to this configuration, in the event of an emergency, the buckle main body can be secondly pivoted after the first pivotal movement, and the waist belt can be stretched over the superior anterior iliac spine, without using a complicated mechanism. Further, at the time of a vehicle collision, the restraint performance of the occupant by the seat belt can be improved while reducing the load on the ribs and the abdomen.

(5) The drive mechanism drives the link mechanism so that the angle formed by the first link and the second link temporarily becomes 180 ° in the emergency, and moves the buckle body. The buckle device according to (4), wherein the buckle device is moved upward and forward and then moved downward and backward.
According to this configuration, in an emergency, the buckle body is moved upward and forward, and then moved downward and backward. Therefore, even when the waist belt is passing through the abdomen of the occupant, the waist belt is moved. As a result, the load on the lower ribs and the abdomen can be reduced, and the occupant restraint performance by the seat belt can be further improved.

(6) The second fixing portion is a shaft member,
The buckle device according to (4) or (5), wherein an elongated hole for guiding the shaft member is formed in the first link along a longitudinal direction thereof.
According to this configuration, the link mechanism can be configured with a simple structure.

(7) The tongue is provided with an extension belt to which an intermediate buckle through which the seat belt is inserted is attached,
The buckle device according to any one of (4) to (6), wherein the intermediate buckle overlaps with the iliac of the occupant when viewed from the front of the vehicle when the link mechanism is driven in the emergency.
According to this configuration, the shoulder belt is restrained by the clavicle and the iliac in an emergency, so that the burden on the lower rib can be further reduced.

(8) The driving mechanism is
A plurality of balls driven by gas pressure of a gas generator generated in an emergency,
A tube containing a plurality of balls,
A pinion that is provided around a shaft member that is the second fixing portion and that rotates integrally with the second link by meshing with the ball;
The buckle device according to any one of (4) to (7), which is a pretensioner including:
According to this configuration, the existing structure of the pretensioner can be suitably used as the drive mechanism.

(9) The driving mechanism includes:
A rack driven by gas pressure of a gas generator generated in an emergency,
A pinion that is provided around a shaft member that is the first fixing portion and that rotates integrally with the second link by meshing with the rack;
The buckle device according to any one of (4) to (7), which is a pretensioner including:
According to this configuration, the existing structure of the pretensioner can be suitably used as the drive mechanism.

(10) The driving mechanism includes:
A piston operated by gas pressure of a gas generator generated in an emergency,
A cylinder for slidably housing the piston,
A connection shaft connecting the first link and the second link, a retraction member that connects the piston, and is retracted by the piston in the emergency;
The buckle device according to any one of (4) to (7), which is a pretensioner including:
According to this configuration, the existing structure of the pretensioner can be suitably used as the drive mechanism.

(11) The retraction member is provided with a return prevention mechanism for preventing the retraction member from moving in the cylinder in a direction opposite to a retraction direction by the piston in the emergency. Buckle device.
According to this configuration, the link mechanism can be more reliably prevented from being driven in the reverse direction by the return prevention mechanism.

(12) The drive mechanism includes:
The buckle device according to any one of (4) to (7), wherein the buckle device is a motor that drives the link mechanism by rotating the second link around the first fixed portion.
According to this configuration, the motor can be suitably used as the drive mechanism.

(13) a load measuring means for measuring a belt load acting on the seat belt;
The buckle according to any one of (4) to (12), wherein in the emergency, when the link load is being driven and the belt load is lower than a first threshold, the driving of the link mechanism is stopped. apparatus.
According to this configuration, further restraint can be stopped even when the waist belt is disengaged from the superior anterior iliac spine and restrains the abdomen in an emergency due to the posture, physique, or movement of the occupant.

(14) a load measuring means for measuring a belt load acting on the seat belt;
The buckle device according to any one of (4) to (13), wherein when the belt load when the seat belt is worn is higher than a second threshold, the driving of the link mechanism is stopped in the emergency.
According to this configuration, the drive of the link mechanism can be stopped when it can be determined in advance that the waist belt can be stretched over the upper anterior iliac spine.

(15) A seat belt device provided with the buckle device according to any one of (1) to (14).
According to this configuration, it is possible to provide a seat belt device that can improve the restraint performance of the occupant by the seat belt while reducing the burden on the ribs and the abdomen during a vehicle collision without using a complicated mechanism. Can be.

Reference Signs List 30 seat belt device 31 seat belt 31A shoulder belt 31B waist belt 31C extension belt 32 tongue 32a insertion hole 35 intermediate buckle 40 buckle device 41 buckle body 50 buckle stay 51 first link 52 first fixing portion 53 second link 54 second Fixed part 55 Connecting shaft 56 Slot 60, 60A, 60B, 60C Drive mechanism M Occupant Mi Ilium Mia Upper anterior iliac spine Ms Shoulder Mw Lumbar

Claims (15)

A buckle body to which a tongue provided on the seat belt can be attached;
A buckle stay that supports the buckle body,
In an emergency, a drive mechanism for driving the buckle stay,
A buckle device comprising:
The buckle stay is configured such that the buckle body portion performs a first turning movement in a direction away from a properly seated occupant, and then performs a second turning movement in a direction approaching the occupant. .   The buckle device according to claim 1, wherein the first pivotal movement of the buckle body moves upward from an initial position.   The buckle device according to claim 2, wherein the second pivotal movement of the buckle body moves downward after the first pivotal movement. A first link connected to the buckle body, a second link connected to the first link, and rotatably attached to a first fixing portion provided on a vehicle body or a seat; A second fixing portion provided on the vehicle body or the seat, wherein the first link is movable along a longitudinal direction thereof and rotatably supports the second link.
The drive mechanism rotates the second link around the first fixing portion and moves and rotates the first link with respect to the second fixing portion in the emergency, whereby the buckle body portion The buckle device according to any one of claims 1 to 3, wherein the buckle device is configured to perform the second turning movement after the first turning movement.   The drive mechanism drives the link mechanism so that the angle formed by the first link and the second link temporarily becomes 180 ° in the emergency, and moves the buckle body upward and forward. The buckle device according to claim 4, wherein the buckle device is moved downward and rearward after the buckle is moved. The second fixing portion is a shaft member,
The buckle device according to claim 4 or 5, wherein the first link has an elongated hole for guiding the shaft member along the longitudinal direction. The tongue is provided with an extension belt attached with an intermediate buckle through which the seat belt is inserted,
The buckle device according to any one of claims 4 to 6, wherein the intermediate buckle overlaps with the iliac of an occupant when viewed from the front of the vehicle when the link mechanism is driven in the emergency. The drive mechanism is
A plurality of balls driven by gas pressure of a gas generator generated in an emergency,
A tube containing a plurality of balls,
A pinion that is provided around a shaft member that is the second fixing portion and that rotates integrally with the second link by meshing with the ball;
The buckle device according to any one of claims 4 to 7, wherein the buckle device is a pretensioner including: The drive mechanism is
A rack driven by gas pressure of a gas generator generated in an emergency,
A pinion that is provided around a shaft member that is the first fixing portion and that rotates integrally with the second link by meshing with the rack;
The buckle device according to any one of claims 4 to 7, wherein the buckle device is a pretensioner including: The drive mechanism is
A piston operated by gas pressure of a gas generator generated in an emergency,
A cylinder for slidably housing the piston,
A connection shaft connecting the first link and the second link, a retraction member that connects the piston, and is retracted by the piston in the emergency;
The buckle device according to any one of claims 4 to 7, wherein the buckle device is a pretensioner including:   The buckle device according to claim 10, wherein the retracting member is provided with a return prevention mechanism for preventing the retracting member from moving in the cylinder in a direction opposite to a direction in which the piston is retracted in an emergency. The drive mechanism is
The buckle device according to any one of claims 4 to 7, wherein the buckle device is a motor that drives the link mechanism by rotating the second link around the first fixed portion. A load measuring means for measuring a belt load acting on the seat belt,
The buckle according to any one of claims 4 to 12, wherein in the emergency, when the belt load is lower than a first threshold while the link mechanism is being driven, the driving of the link mechanism is stopped. apparatus. A load measuring means for measuring a belt load acting on the seat belt,
The buckle device according to any one of claims 4 to 13, wherein when the belt load at the time of wearing the seat belt is higher than a second threshold, the driving of the link mechanism is stopped in the emergency.   A seat belt device comprising the buckle device according to claim 1.

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