Buckle device and vehicle

Abstract

To provide a buckle device and a vehicle which can improve usability.SOLUTION: A buckle device 34 of a seat belt 13 comprises: a buckle 41 which is arranged at an opening 21a of a seat 12; a bracket 51 which is separated from the buckle 41 in a front-back direction of a vehicle 1 and fixed to a floor panel 11a of the vehicle 1; a first connection plate 52; a second connection plate 54 which is fixed to the buckle 41; a first revolving shaft 53 which relatively rotatably connects the bracket 51 with the first connection plate 52; a second revolving shaft 55 which relatively rotatably connects the first connection plate 52 with the second connection plate 54; a first energization component 56 which includes an arm 56b holding a lower side of the first connection plate 52 in an attitude where one end and the other end are separated in the front-back direction and energizes, when the first connection plate 52 moves downward, the first connection plate 52 upward; and a second energization component 57 which energizes the second connection plate 54 in the front-back direction in a state where one end of the second connection plate 54 at a second revolving shaft 55 side is positioned at a lower side and the other end at a buckle 41 side is positioned at an upper side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a seat belt buckle device and a vehicle. [Background technology]

[0002] Seat belts have long been installed in vehicles such as automobiles and trucks. Seat belts are fastened by fastening a tongue on the strap to a buckle while the strap is wrapped around a seated occupant. The buckle of such seat belts is rotatably attached to a floor panel or the like of the vehicle body via a bracket or hinge (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-016345 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, it is conceivable to provide an opening in the seat, place the buckle in the opening, store the buckle in the opening, and then remove the buckle from the opening. However, when connecting the tongue to the buckle, the occupant needs to rotate the buckle or hold the buckle.

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a buckle device and a vehicle that can improve usability. [Means for solving the problem]

[0006] According to one aspect of the present invention, a buckle device is a buckle device for a seat belt provided on a vehicle seat, and includes: a buckle arranged in an opening of the seat; a bracket fixed to a floor panel of the vehicle and spaced from the buckle in the fore-and-aft direction of the vehicle; a first connecting plate; a second connecting plate fixed to the buckle; a first rotating shaft connecting the bracket and the first connecting plate so that they can rotate relative to each other; a second rotating shaft connecting the first connecting plate and the second connecting plate so that they can rotate relative to each other; a first biasing member having an arm that holds the lower side of the first connecting plate in an orientation in which one end and the other end of the first connecting plate are spaced apart in the fore-and-aft direction, and that biases the first connecting plate upward when the first connecting plate in that orientation moves downward; and a second biasing member that biases the second connecting plate in the fore-and-aft direction when one end of the second connecting plate on the side of the second rotating shaft is positioned downward and the other end of the second connecting plate on the side of the buckle is positioned upward. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a buckle device and a vehicle that can improve usability. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing a schematic configuration of a seat and a seat belt of a vehicle according to one embodiment of the present invention. [Figure 2] FIG. 2 is a side view schematically showing the configuration of the seatbelt buckle device according to the embodiment. [Figure 3] FIG. 3 is a perspective view showing the configuration of a hinge mechanism of the buckle device according to the embodiment. [Figure 4] FIG. 4 is a perspective view showing the configuration of a first hinge of the hinge mechanism according to the embodiment. [Figure 5] FIG. 5 is a perspective view showing the configuration of a second hinge of the hinge mechanism according to the embodiment. [Figure 6] FIG. 6 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 7]FIG. 7 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 8] FIG. 8 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 9] FIG. 9 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 10] FIG. 10 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 11] FIG. 11 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 12] FIG. 12 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 13] FIG. 13 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 14] FIG. 14 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 15] FIG. 15 is a side view schematically showing an example of use of the seat belt according to the embodiment. [Figure 16] FIG. 16 is a side view schematically showing an example of use of the seat belt according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A vehicle 1 having a seat belt 13 according to one embodiment of the present invention will be described below with reference to Figs. 1 to 16. Fig. 1 is a perspective view schematically showing the configuration of a seat 12 and a seat belt 13 of a vehicle 1 according to one embodiment of the present invention. Fig. 2 is a side view schematically showing the configuration of a buckle device 34 of the seat belt 13. Fig. 3 is a perspective view showing the configuration of a hinge mechanism 42 of the buckle device 34. Fig. 4 is a perspective view showing the configuration of a first hinge 42a of the hinge mechanism 42. Fig. 5 is a perspective view showing the configuration of a second hinge 42b of the hinge mechanism 42. Figs. 6 to 16 are side views each schematically showing an example of use of the seat belt 13. Note that in each drawing, the configuration is enlarged, reduced, or omitted as appropriate.

[0010] The vehicle 1 is, for example, a truck. The vehicle 1 is, for example, a flatbed vehicle, a wing vehicle, a vehicle with a hood, a crane vehicle, an on-board vehicle, a tanker truck, etc. The vehicle 1 is not limited to a truck, and may be a bus, a passenger car, a special-purpose vehicle, etc.

[0011] As shown in FIG. 1, a vehicle 1 includes a vehicle body 11, a seat 12, and a seat belt 13.

[0012] The vehicle body 11 includes a chassis having a frame and four or more wheels, and a cabin provided with a floor panel 11a.

[0013] 1 and 2, the seat 12 includes a seat cushion 21 and a seat back 22. The seat 12 is attached to the floor panel 11a by a seat bracket so as to be movable in the front-rear direction of the vehicle 1 and rotatable around an axis along the left-right direction of the vehicle 1.

[0014] The seat cushion 21 forms a seating surface on which an occupant sits. The seat cushion 21 is formed with openings 21a, in which buckles 41 (described later) of the seat belts 13 can be placed, the number of which is equal to or greater than the number of seat belts 13 provided in the vehicle body 11. When the seat 12 is in a position in which an occupant can be seated, for example, the upper side of the openings 21a on the seat cushion 21 has a constant opening width in the front-rear direction of the vehicle 1 and extends along the up-down direction or in a direction inclined relative to the up-down direction, and the lower side of the openings 21a on the seat cushion 21 (toward the floor panel 11a) is formed in a shape in which the opening width increases downward in the front-rear direction of the vehicle 1.

[0015] The seat back 22 forms a backrest. The seat back 22 is formed to be rotatable relative to the seat cushion 21.

[0016] The seat belt 13 is a safety device provided on the seat 12 to restrain the occupant in the event of a collision or sudden braking of the vehicle 1. The seat belt 13 includes a two-point seat belt in which a strap is worn from both ends of the occupant's waist to the front of the waist, and a three-point seat belt in which a strap is worn from both ends of the waist to the front of the waist, as well as from the shoulders through the chest and abdomen to the waist.

[0017] The seat belt 13 includes, for example, a strap 31, a retractor 32, a tongue 33, and a buckle device 34. The strap 31 is a so-called webbing and is formed in a belt shape. For example, one end of the strap 31 is retracted by the retractor 32, and the other end of the strap 31 is fixed to the vehicle body 11, the seat 12, or the like. The seat belt 13 may also have devices that perform additional functions, such as a pretensioner device that automatically retracts the strap 31 when a collision is detected, thereby hastening the start of restraining the occupant, or a load limiter that gradually loosens the restraint of the strap 31 when a certain load is applied to the strap 31 during a collision or the like, thereby reducing the load applied to the occupant.

[0018] The retractor 32 is configured to retract and store the strap 31 and to be able to pull out the stored strap 31. The retractor 32 is, for example, an Emergency Locking Retractor (ELR) that does not normally lock the strap 31 but locks the strap 31 in the event of a collision or the like. The ELR may also have a function to lock the belt by pulling out the belt by a certain amount or more.

[0019] The tongue 33 is provided on the strap 31 so as to be movable along the longitudinal direction of the strap 31. The tongue 33 is configured so as to be connectable to a buckle 41 (described later) of the buckle device 34. For example, the tongue 33 is fixed to the buckle 41 by inserting a portion of the tongue 33 into the buckle 41, and is released from the fixation to the buckle 41 by operating a release operating portion provided on the buckle 41.

[0020] As shown in FIG. 2, the buckle device 34 includes a buckle 41 and a hinge mechanism 42.

[0021] The buckle 41 is connected to the tongue 33. When the tongue 33 is inserted in one direction, the buckle 41 holds the tongue 33, and when the occupant performs an unlocking operation, the buckle 41 releases the held tongue 33. As shown in FIG. 2 , the buckle 41 is disposed in the opening 21a of the seat cushion 21. The buckle 41 is connected to the floor panel 11a via a hinge mechanism 42, and is disposed in a position spaced apart from a bracket 51 (described later) of the hinge mechanism 42 in the front-rear direction of the vehicle 1. The buckle 41 is formed in a shape that allows it to be disposed in the opening 21a with a predetermined gap therebetween. For example, the dimensions of the buckle 41 in the front-rear and left-right directions of the vehicle 1 are formed to be slightly smaller than the opening width of the opening 21a.

[0022] 2 and 3, the hinge mechanism 42 is configured to allow the buckle 41 to move around two axes along the left-right direction of the vehicle 1. For example, the hinge mechanism 42 holds the buckle 41 in a position along the opening 21a, and is configured to allow the buckle 41 to rotate around one axis along the left-right direction of the vehicle 1 when a predetermined external force is applied to the buckle 41. Furthermore, for example, the hinge mechanism 42 restricts downward movement of the buckle 41 when a downward external force equal to or less than the predetermined external force is applied to the buckle 41, and allows downward movement of the buckle 41 when a downward external force greater than the predetermined external force is applied to the buckle 41.

[0023] Here, the predetermined external force is, for example, larger than the force (load) applied to the buckle 41 by the tongue 33 when an occupant connects the tongue 33 to the buckle 41. Also, the predetermined external force is, for example, smaller than the force applied to the buckle 41 when an occupant expected to board gets on the buckle 41. As a specific example, the predetermined external force is set to be smaller than the weight of the occupant expected to board. Note that an example of an occupant expected to board the seat 12 is, but is not limited to, the average weight of an occupant old enough to sit in the seat 12 without using a booster seat such as a child seat.

[0024] 3 to 5, the hinge mechanism 42 includes a bracket 51, a first connecting plate 52, a first rotating shaft 53, a second connecting plate 54, a second rotating shaft 55, a first biasing member 56, and a second biasing member 57. The hinge mechanism 42 has a so-called double hinge structure in which the bracket 51 and the first connecting plate 52 are connected via the first rotating shaft 53 to form a first hinge 42a, and the first connecting plate 52 and the second connecting plate 54 are connected via the second rotating shaft 55 to form a second hinge 42b.

[0025] The bracket 51 is fixed to the floor panel 11a. As shown in FIG. 2 , the bracket 51 is provided at a position separated in the front-rear direction of the vehicle 1 from an opening 21a provided in the seat 12 when the seat 12 is in a position where an occupant can be seated. An opening into which, for example, a first rotation shaft 53 can be inserted is formed at an end of the bracket 51 that is forward in the front-rear direction of the vehicle 1. The bracket 51 also has, at one end, two holding portions 51a and 51b that hold, for example, a first biasing member 56. One holding portion 51a holds a first arm 56b (described later) of the first biasing member 56, and the other holding portion 51b holds a second arm 56c (described later) of the first biasing member 56. The two holding portions 51a and 51b are provided at positions offset in the circumferential direction around an axis along the left-right direction of the vehicle 1.

[0026] The first connecting plate 52 is formed in a plate shape that is long in one direction. Openings 52a are formed on both ends of the first connecting plate 52. A first rotating shaft 53 is inserted into the opening 52a formed on one end of the first connecting plate 52. A second rotating shaft 55 is inserted into the opening 52a formed on the other end of the first connecting plate 52. Furthermore, a holding portion 52b that holds a second biasing member 57 is formed on the other end of the first connecting plate 52 where the second rotating shaft 55 is provided.

[0027] The first rotation shaft 53 connects the bracket 51 and the first connecting plate 52 so that the bracket 51 and the first connecting plate 52 can rotate relatively around the first rotation shaft 53. Since the bracket 51 is fixed to the floor panel 11a, the first connecting plate 52 rotates around the first rotation shaft 53 relative to the bracket 51.

[0028] The second connecting plate 54 is formed in a plate shape that is long in one direction. An opening 54a into which the second rotating shaft 55 can be inserted is formed at one end of the second connecting plate 54. In addition, an opening 54b into which the buckle 41 can be fixed is formed at the other end of the second connecting plate 54.

[0029] The second rotation shaft 55 connects the first connecting plate 52 and the second connecting plate 54 so that the first connecting plate 52 and the second connecting plate 54 can rotate relative to each other around the second rotation shaft 55.

[0030] The first biasing member 56 is a torsion spring. The first biasing member 56 includes a coil portion 56a, a first arm 56b, and a second arm 56c. The inner diameter of the coil portion 56a is larger than the outer diameter of the first rotating shaft 53. The first rotating shaft 53 is inserted into the coil portion 56a.

[0031] The first arm 56b is held by one of the holding portions 51a of the bracket 51. The first arm 56b is positioned so as to be able to come into contact with the first connecting plate 52 at a predetermined position in the rotation direction of the first connecting plate 52 about the first rotation shaft 53. For example, the first arm 56b is positioned at a position so as to be able to come into contact with the first connecting plate 52 in an orientation in which the first rotation shaft 53 and the second rotation shaft 55 are spaced apart in the longitudinal direction of the vehicle 1, and is held by one of the holding portions 51a of the bracket 51. As a specific example, the first arm 56b comes into contact with a portion of a lower side of the first connecting plate 52 in a first orientation (first position) in which the longitudinal direction of the first connecting plate 52 is along the longitudinal direction of the vehicle 1 or in a direction substantially along the longitudinal direction of the vehicle 1. Furthermore, the first arm 56b upwardly urges the first connecting plate 52, which moves downward from the first orientation, by the urging force of the coil portion 56a. The first arm 56b holds the first connecting plate 52 in the first position until a downward external force greater than a predetermined external force is applied to the first connecting plate 52. Furthermore, when a downward external force greater than a predetermined external force is applied to the first connecting plate 52, the first arm 56b rotates around the first rotation shaft 53 together with the first connecting plate 52.

[0032] The second arm 56c is held by the other holding portion 51b of the bracket 51. The second arm 56c is positioned so as to be able to come into contact with the first connecting plate 52 at a predetermined position in the rotation direction of the first connecting plate 52 about the first rotation shaft 53. For example, the second arm 56c is positioned at a position so as to be able to come into contact with the first connecting plate 52 in an orientation in which the first rotation shaft 53 and the second rotation shaft 55 are spaced apart in the up-down direction, and is held by the other holding portion 51a of the bracket 51. As a specific example, the second arm 56c comes into contact with the first connecting plate 52 in a second orientation (second position) in which the longitudinal direction of the first connecting plate 52 is aligned with the up-down, front-rear direction of the vehicle 1 or is inclined with respect to the up-down direction of the vehicle 1. In addition, the second arm 56c biases the first connecting plate 52, which moves further rearward than in the second orientation, forward. Here, for example, the second posture is a posture in which the first connecting plate 52 is slightly tilted toward the rear of the vehicle 1 relative to the posture along the up-down direction. The second arm 56c holds the first connecting plate 52 in the second posture until a rearward external force greater than a predetermined external force is applied to the first connecting plate 52, and when a rearward external force greater than the predetermined external force is applied to the first connecting plate 52, the second arm 56c rotates around the first rotation shaft 53 together with the first connecting plate 52.

[0033] For example, the angle between the first arm 56b and the second arm 56c held by the two holding portions 51a, 51b is set to a predetermined angle, specifically, equal to or greater than 90° and less than 180°.

[0034] Therefore, the first hinge 42a formed by the bracket 51, the first connecting plate 52, and the first rotating shaft 53 is configured so that the first connecting plate 52 can rotate freely between the first and second positions of the first connecting plate 52 without being biased by the first biasing member 56. The first hinge 42a allows the first connecting plate 52 to rotate downward from the first position, which is the direction opposite to the second position, and to rotate backward from the second position, which is the direction opposite to the first position, when an external force exceeding the biasing force of the coil portion 56a is applied to the first connecting plate 52.

[0035] The second biasing member 57 is a torsion spring. The second biasing member 57 includes a coil portion 57a, a first arm 57b, and a second arm 57c. The inner diameter of the coil portion 57a is larger than the outer diameter of the second rotating shaft 55. The second rotating shaft 55 is inserted into the coil portion 57a.

[0036] The first arm 57b and the second arm 57c are held by a holder 52b formed on the other end of the first connecting plate 52. The first arm 57b and the second arm 57c are arranged so as to be able to abut against the holder 52b of the first connecting plate 52 at predetermined positions in the rotation direction of the first connecting plate 52 and the second connecting plate 54 about the second rotation axis 55. For example, the first arm 57b and the second arm 57c are held by the holder 52b in a third posture (third position) in which the first connecting plate 52 and the second connecting plate 54 are orthogonal or approximately orthogonal to each other. Note that the first connecting plate 52 and the second connecting plate 54 in the third posture are, for example, arranged such that when the first connecting plate 52 is in the first posture, the second connecting plate 54 is aligned vertically or approximately aligned vertically. The first arm 57b and the second arm 57c come into contact with the second connecting plate 54 in the third position, or come into contact when the second connecting plate 54 rotates slightly from the third position. When the second connecting plate 54 rotates relative to the first connecting plate 52 from the third position due to a predetermined external force, the first arm 57b or the second arm 57c moves together with the second connecting plate 54.

[0037] When the first connecting plate 52 and the second connecting plate 54 are in the third position, the second hinge 42b formed by the first connecting plate 52, the second connecting plate 54, and the second rotating shaft 55 is either not biased by the second biasing member 57 or is biased by the second biasing member 57, thereby maintaining the third position. When an external force exceeding the biasing force of the coil portion 57a is applied to one of the first connecting plate 52 and the second connecting plate 54, the second hinge 42b allows relative rotation of the first connecting plate 52 and the second connecting plate 54 around the second rotating shaft 55 from the third position.

[0038] In addition, in such a hinge mechanism 42, the biasing force of the coil portion 57a of the second biasing member 57 is set smaller than the biasing force of the coil portion 56a of the first biasing member 56. Here, the biasing force of the coil portions 56a, 57a is a torque spring constant (N·mm / deg).

[0039] For example, the biasing force of the coil portion 56a of the first biasing member 56 is such that the first connecting plate 52 does not move downward due to the force applied to the buckle 41 when the tongue 33 is connected to the buckle 41, and the first connecting plate 52 can move downward from the first position due to the force applied to the buckle 41 when an expected occupant sits on the buckle 41. In other words, the biasing force of the coil portion 56a of the first biasing member 56 is greater than the force applied to the buckle 41 when the tongue 33 is connected to the buckle 41, and is smaller than the force applied to the buckle 41 when an expected occupant sits on the buckle 41.

[0040] The biasing force of the coil portion 57a of the second biasing member 57 is a biasing force that allows the second connecting plate 54 to rotate from the third position due to a force applied to the buckle 41 when, for example, the strap 31 is wound by the retraction device 32 after the occupant fastens the tongue 33 to the buckle 41 and the occupant is restrained by the strap 31. In other words, the biasing force of the coil portion 57a of the second biasing member 57 is smaller than the force that winds up the strap 31 by the retraction device 32 after the occupant fastens the tongue 33 to the buckle 41, and is also smaller than the force that is applied to the buckle 41 when the occupant is restrained by the strap 31.

[0041] 2 and 6 , in the buckle device 34 configured as described above, the buckle 41 is positioned in the opening 21a of the seat 12. In this initial position, where no external force is applied to the buckle 41, the first hinge 42a is in a first position, the second hinge 42b is in a third position, and the first rotation shaft 53 and the second rotation shaft 55 are spaced apart in the longitudinal direction of the vehicle 1. For example, the first connecting plate 52 is held on the first arm 56b of the first biasing member 56 in a position aligned with or substantially aligned with the longitudinal direction of the vehicle 1. The second connecting plate 54 is held by the second biasing member 67 in a position aligned with or substantially aligned with the vertical direction, and this position is maintained. When the buckle device 34 is in the initial position, the inner surface of the opening 21a in the longitudinal direction and the outer surface of the buckle 41 in the longitudinal direction are substantially parallel with each other, with a predetermined gap therebetween.

[0042] 6, when the tongue 33 is connected to the buckle 41, the first hinge 42a maintains its initial position due to the biasing force of the first biasing member 56. In this way, when the tongue 33 is connected to the buckle 41, the first arm 56b of the first biasing member 56 acts as a stopper for the downward movement of the first connecting plate 52, so the buckle device 34 does not require the occupant to pull up the buckle 41 or to hold the buckle 41. Therefore, the occupant can fasten the seat belt 13 with a single action of operating the tongue 33.

[0043] 6, after the tongue 33 is connected to the buckle 41, when the occupant releases the tongue 33, the retractor 32 retracts the strap 31. As shown in FIGS. 7 to 9, the retractor 32 retracts the strap 31, causing the buckle 41 to move upward and the first hinge 42a and the second hinge 42b to rotate. At this time, the first biasing member 56 and the second biasing member 57 resist the force in the retracting direction of the strap 31. Therefore, the seat belt 13 can reduce the feeling of pressure caused by the strap 31 worn by the occupant. Note that the rotation angles of the first hinge 42a and the second hinge 42b vary depending on the physique of the occupant, and therefore, FIGS. 7 to 9 are merely examples, and the orientations of the first hinge 42a and the second hinge 42b when the seat belt 13 is worn are not limited to these examples.

[0044] Furthermore, when the occupant releases the connection between the tongue 33 and the buckle 41 in order to unfasten the seat belt 13, the buckle device 34 moves the buckle 41 to the initial position in the order shown in Figures 9 to 6 by the first biasing member 56 and the second biasing member 57, so the occupant does not need to move the buckle 41 to the opening 21a.

[0045] As described above, the seat belt 13 can reduce the amount of operation of the buckle 41 that the occupant must perform when wearing the seat belt, thereby achieving high usability and improving the ease of wearing the strap 31 when wearing the seat belt 13.

[0046] 10 and 11, when an occupant sits on the seat cushion 21 and presses the buckle 41 downward, the first connecting plate 52 moves downward against the bias of the first biasing member 56, and the buckle 41 is positioned flush with the upper surface of the seat cushion 21. This reduces pain felt by the occupant when the occupant comes into contact with the buckle 41 as the occupant moves left or right on the seat 12. In FIGS. 10 and 11, the occupant is indicated by a two-dot chain line.

[0047] Furthermore, when no external force is applied, the hinge mechanism 42 maintains its initial position, so the buckle 41 does not collapse within the opening 21a of the seat 12, and the occupant does not need to pull out the collapsed buckle 41. Furthermore, the height position of the buckle 41 may be a position where the tongue 33 can be inserted when the buckle 41 is disposed in the opening 21a, so the buckle 41 can be prevented from excessively protruding from the opening 21a, and therefore, when the occupant sits in the seat 12, it is not necessary to change the position of the interfering buckle 41.

[0048] Furthermore, because the trajectory of the buckle 41 is a single-direction trajectory, i.e., the downward movement of the first connecting plate 52, the opening 21a formed in the seat 12 only needs to have a gap between it and the buckle 41 that is large enough to prevent interference with the buckle 41 as it moves downward. That is, when the tongue 33 is connected to the buckle 41 or the occupant presses the buckle 41, the buckle device 34 moves downward in a single direction. This eliminates the need for the buckle 41 to tilt in the fore-aft direction, allowing the fore-aft width of the opening 21a to be reduced. Therefore, the shape of the opening 21a in the seat 12 can be reduced, improving the appearance of the seat 12. Furthermore, by reducing the size of the opening 21a and the gap between the buckle 41 and the opening 21a, the seat 12 can prevent small items from falling downward through the opening 21a.

[0049] 2 and 12 to 16, when the seat 12 is rotated relative to the floor panel 11a, if the buckle 41 interferes with the inner surface of the opening 21a, the first hinge 42a and the second hinge 42b rotate, but when the interference with the inner surface of the opening 21a is released, the first hinge 42a and the second hinge 42b return to their initial positions due to the biasing force of the first biasing member 56 and the second biasing member 57. Therefore, even when the seat 12 is rotated, it is not necessary to move the buckle 41 in a direction to retract it from the seat 12.

[0050] As described above, according to the vehicle 1 equipped with the seat belt 13 according to one embodiment of the present invention, the usability of the seat belt 13 can be improved.

[0051] The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the spirit of the invention. Furthermore, the embodiments may be implemented in appropriate combinations, in which case the combined effects can be obtained. Furthermore, the above-described embodiments include various inventions, and various inventions can be extracted by combining selected elements from the disclosed elements. For example, if the problem can be solved and the desired effect can be obtained even if some elements are deleted from all elements shown in the embodiments, the configuration from which these elements are deleted can be extracted as an invention. [Explanation of symbols]

[0052] 1...vehicle, 11...vehicle body, 11a...floor panel, 12...seat, 13...seat belt, 21...seat cushion, 21a...opening, 22...seat back, 31...strap, 32...device, 33...tongue, 34...buckle device, 41...buckle, 42...hinge mechanism, 42a...first hinge, 42b...second hinge, 51...bracket, 51a...holding portion, 51b ...holding portion, 52...first connecting plate, 52a...opening, 52b...holding portion, 53...first rotating shaft, 54...second connecting plate, 54a...opening, 54b...opening, 55...second rotating shaft, 56...first biasing member, 56a...coil portion, 56b...first arm, 56c...second arm, 57...second biasing member, 57a...coil portion, 57b...first arm, 57c...second arm, 67...second biasing member.

Claims

1. A seat belt buckle device provided on a vehicle seat, a buckle disposed in the opening of the seat; a bracket fixed to a floor panel of the vehicle at a distance from the buckle in the front-rear direction of the vehicle; A first connecting plate; a second connecting plate fixed to the buckle; a first rotation shaft that connects the bracket and the first connecting plate so as to be rotatable relative to each other; a second rotation shaft that connects the first connecting plate and the second connecting plate so as to be rotatable relative to each other; a first biasing member that has an arm that holds a lower portion of the first connecting plate in a position where one end and the other end of the first connecting plate are spaced apart in the front-rear direction, and that biases the first connecting plate upward when the first connecting plate in the position moves downward; a second biasing member that biases the second connecting plate in the front-rear direction in a state where one end of the second connecting plate on the second rotation shaft side is positioned downward and the other end of the second connecting plate on the buckle side is positioned upward; A buckle device comprising:

2. 2. The buckle device according to claim 1, wherein the biasing force of the first biasing member is greater than a force acting on the buckle when a tongue provided on a strap of the seat belt is connected to the buckle.

3. 3. The buckle device according to claim 2, wherein the biasing force of the first biasing member is smaller than a force applied to the buckle when an occupant who is expected to be seated in the seat stands on the buckle.

4. 2. The buckle device according to claim 1, wherein the biasing force of the second biasing member is smaller than the force with which a retractor winds up the strap of the seat belt.

5. Floor panels and a sheet having an opening; a seat belt having the buckle device according to any one of claims 1 to 4, a strap, and a tongue connected to the buckle device; A vehicle equipped with:

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