JPH11321559A - Buckle device for seat belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize seat belt tension generated by a pretensioner to improve initial constraint by connecting a second slider to a first slider so as to be relatively movable forward in a vehicle, when seat belt tension exceeds a set value. SOLUTION: A fixed part 21 is fitted to the left side part of a seat cushion 6, a driving force generating means 30 is fixed to the fixed part 21 to generate driving force acting on the deceleration of a vehicle, and a first slider 45 is fitted to a guide rail 40 so as to move rearward in the vehicle along the guide rail 40 fixed to the fixed part 21 by the generated driving force. A second slider 50 connected to the rod 19 of a buckle 18 being latched with a sheet belt 14 is fitted to the first slider 45 so as to relatively move forward in the vehicle along the first slider 45 when the seat belt tension exceeds a set value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a buckle device for a seat belt.

[0002]

2. Description of the Related Art Some seat belt devices are provided with a pretensioner in order to obtain excellent restraint performance at the beginning of an emergency such as a vehicle collision. According to the pretensioner, when the vehicle collides, the seat belt is retracted and the slack of the seat belt is instantaneously removed, so that the occupant restraint performance can be improved. Also, some seat belt devices include a shock energy absorbing mechanism (hereinafter, referred to as "an impact energy absorbing mechanism" that absorbs impact energy acting on an occupant when the seat belt tension exceeds a set value while pulling out a predetermined amount of the seat belt while keeping the seat belt tension constant. EA mechanism. ”
EA is an abbreviation for Energy Absorb. ).

As a seat belt device incorporating the above-mentioned pretensioner and EA mechanism in a winding device, for example, Japanese Patent Application Laid-Open No. 9-2203, "Seat Belt Device" is known. I do. On the other hand, a seat belt device in which the pretensioner and the EA mechanism are provided in a buckle device is disclosed in, for example, JP-A-8-268224.
Japanese Unexamined Patent Publication (Kokai) No. H11-260, "Method of Limiting Force and Limiter of Force" is known, and the technique shown in FIG.

FIG. 18 is an explanatory view of a conventional seat belt device (a device in which a pretensioner and an EA mechanism are incorporated in a winding device). The seat belt device incorporates a pretensioner and an EA mechanism in the winding device 100. When the deceleration of the vehicle exceeds a set value, the pretensioner operates and the winding device 100 winds the seat belt 101. Then, the slack of the seat belt 101 is instantaneously removed. When the seat belt tension exceeds a set value, the seat belt 101 is moved by the EA mechanism.
To absorb the impact energy acting on the occupant 102.

[0005] The pretensioner is configured to wind the seatbelt 101 along a shoulder belt 101a as shown by an arrow in order to remove the slack of the seatbelt 101. The shoulder belt 101a indicates a belt between the through anchor 105a and the tongue 105b. In addition, 101b is
9 shows a waist belt between the tongue 105b and the anchor plate 105c.

FIG. 19 is an explanatory view of a conventional seat belt device (a device in which a pretensioner and an EA mechanism are provided in a buckle device). (Note that the seat belt pull angle is shoulder belt 1
The inclination of the buckle 112 with respect to the horizontal is described as the inclination α of the buckle 112 for easy understanding. same as below. The seat belt device is a device in which an EA mechanism is built in the pretensioner 111 of the buckle device 110. When the deceleration of the vehicle exceeds a set value, the pretensioner 111 moves the buckle 112 in the direction of the arrow to release the seat belt 113. Instantly remove looseness. When the seat belt tension exceeds a set value, the EA mechanism moves the buckle 112 in the reverse direction to absorb the impact energy acting on the occupant 115.

[0007] The pretensioner 111 is a seat belt 1
In order to remove the slack of the seat 13, the seat belt 113 is configured to be pulled along the shoulder belt 113a as shown by an arrow. Therefore, even if the seat belt 113 is pulled by the pretensioner 111, the seat belt pull angle α does not change.
In addition, 116 is a gas generating unit, 117 is a cylinder into which gas flows, 117a is a piston moving in the cylinder 117, 118 is a cable connecting the piston 117a and the buckle 112, and 119 is a pin.

[0008]

FIG. 20 is a cross-sectional view of FIG.
It is a -20 line sectional view. The seat belt 101 is moved by the pretensioner of the winding device 100 to the shoulder belt 101a as shown by the arrow.
(See FIG. 18), the seat belt tensions T1 and T1 act on the extension of the shoulder belt 101a. Therefore, the seat belt pull angle does not change. The resultant force T2 of the seat belt tensions T1 and T1 is shifted by an angle θ1 with respect to the direction of the inertial force T3 acting on the occupant 102. Therefore, the seat belt tensions T1 and T1 generated by the operation of the pretensioner in the early stage of the sudden deceleration of the vehicle are not effectively utilized.

On the other hand, also in the seat belt device of FIG. 19, the seat belt pulling angle α does not change because the pretensioner pulls the seat belt along the shoulder belt. Therefore, if the seat belt tension of the shoulder belt is T1, T1, the resultant force is T2, and the inertia force acting on the occupant is T3, the relationship between the resultant force T2 and the inertia force T3 acting on the occupant is the same as in FIG. Therefore, the seat belt tensions T1 and T1 generated by the operation of the pretensioner in the early stage of the sudden deceleration of the vehicle are not effectively utilized.

Accordingly, an object of the present invention is to improve the initial restraint by effectively utilizing the seat belt tension generated by the pretensioner in the early stage of the sudden deceleration of the vehicle.
An object of the present invention is to provide a buckle device for a seat belt that can reduce an impact from a seat belt acting on an occupant.

[0011]

According to a first aspect of the present invention, there is provided a buckle device for a seat belt for securing safety of an occupant, wherein a driving force is generated in response to a deceleration of a vehicle. By a driving means, a guide rail fixed to a seat frame or a vehicle, and the driving force,
A first slider connected to the guide rail so as to move rearward of the vehicle along the guide rail is connected to a base end of the buckle, and when the seat belt tension exceeds a set value, the first slider is moved forward with respect to the first slider. And a second slider connected so as to be relatively movable with the second slider.

By moving the first slider to the rear of the vehicle, the seat belt approaches horizontal, and the seat belt pulling angle connected to the buckle decreases. For this reason, the resultant force of the seat belt tension can be made closer to the direction opposite to the direction of action of the inertial force acting on the occupant. As a result, the seat belt tension can effectively act as the restraining force of the occupant. Further, even if the seat belt tension is kept small, a resultant force according to the inertia force of the occupant can be obtained, so that downsizing of the driving means can be achieved.
Further, when the seat belt tension exceeds the set value, the second
By moving the slider forward of the vehicle, the impact energy acting on the occupant can be absorbed by the second slider. In addition, since the seat belt is moved to the rear of the vehicle by the first slider via the buckle and the impact energy is absorbed by the second slider, the occupant restraint performance and the impact energy absorption performance are independent of each other. And can be set individually. As a result, each performance can be easily set to a desired performance.

According to a second aspect of the present invention, the base end of the buckle is connected to the second slider so as to be swingable in the front-rear and left-right directions of the vehicle, and the guide rail is seated toward the rear of the vehicle. It is characterized by being arranged so as to approach.

Since the first slider moves so as to approach the seat while moving to the rear of the vehicle, the seat belt pulling angle can be further reduced, and the waist belt of the seat belt can be wound around the waist of the occupant. For this reason, it becomes possible to further improve the restraining force of the occupant.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. “Front”, “rear”, “left” and “right” are based on the occupant. FIG. 1 is a perspective view of a seat to which a seat belt buckle device (first embodiment) according to the present invention is attached. The seat 1 includes a seat cushion 6 attached to the floor 4 of the vehicle 2, a seat back 8 attached to the seat cushion 6 so as to be reclined, and a seat belt device 10 for protecting an occupant.

The seat belt device 10 is mounted on a vehicle 2 on the right side of the seat 1 and provided with a winding device 12 provided with an ELR (not shown), and one end is mounted on the winding device 12 and the other end is mounted on the right side of the seat cushion 6. The seat belt 14 includes a seat belt 14 attached to the floor 4 by the attachment 7, a tongue 16 movably attached to the seat belt 14, and a buckle device 20 for a seat belt provided with a buckle 18 for stopping the tongue 16.

FIG. 2 is a plan view of the seat to which the seat belt buckle device (first embodiment) according to the present invention is attached. A seat belt buckle device 20 is attached to the left side of the seat cushion 6, and this seat belt A state where the tongue 16 is attached to the buckle 18 of the buckle device 20 and the occupant 11 is restrained to the seat 1 by the seat belt 14 is shown.

FIG. 3 is a sectional view of a seat belt buckle device (first embodiment) according to the present invention. The buckle device 20 for a seat belt includes a fixing portion 21 (see also FIGS. 1 and 2) attached to the left side of the seat cushion (seat frame) 6, and is fixed to the fixing portion 21 to react to the deceleration of the vehicle. Force generating means (driving means) 30 for generating a driving force
And the guide rail 40 fixed to the fixing portion 21 and the guide rail 4 so as to move rearward of the vehicle along the guide rail 40 by the driving force generated by the driving force generating means 30.
0 and the rod 19 (base end) of the buckle 18 for hooking the seat belt 14 and the vehicle, along the first slider 45 when the seat belt tension T exceeds a set value. First to move forward relative
And a second slider 50 attached to the slider 45.

The fixing portion 21 is composed of a board 23 attached to the seat cushion 6 with bolts 22 (shown in FIG. 1),
3 includes mounting brackets 24, 25 (see also FIG. 1) before and after the guide rail 40 and the driving force generating means 30 are mounted. The driving force generating means 30 includes a gas generating unit 31 that generates a large amount of gas when the deceleration of the vehicle exceeds a predetermined value.
A cylinder 33 for receiving the gas generated by the gas generating unit 31 through the guide path 32, a piston 34 that moves by the gas flowing into the cylinder 33, a lock member 35 attached to the piston 34, and a lock member 35. It comprises a lock claw 36 provided on the inner periphery of the cylinder 33 for locking, and a cable 37 connecting the piston 34 and the first slider 45.

The guide rail 40 is a member (shown in FIG. 2) mounted substantially parallel to the floor 4 (see FIG. 1) and obliquely mounted so as to approach the seat 1 toward the rear of the vehicle. A cylinder 41 having a slit 41a for receiving the rod 19 of the buckle 18;
A front cover 42 for closing the front end of the first and a rear cover 4 for closing the back of the cylindrical body 41
3

The first slider 45 has a cylindrical body 46 having a slit 46a for receiving the rod 19 of the buckle 18, and a cable stopper 47 attached to the rear end of the cylindrical body 46.
And a front cover 48 closing the front end of the cylindrical body 46, and a lock hole 41 b of the cylindrical body 41 of the guide rail 40 attached to the front cover 48.
And a lock piece 49 inserted into the lock. Second slider 50
Consists of a slider 51, a pin 52 for attaching the rod 19 of the buckle 18 to the slider 51, and a plastic deformation member 53 mounted between the slider 51 and the front lid 48 of the first slider 45. The plastic deformation member 53
Is a member formed of, for example, a metal plate or a spring piece.

FIG. 4 is a sectional view taken along line 4-4 of FIG. The pin 52 has a spherical portion 52a at the center thereof.
By attaching the rod 19 of the buckle 18 to the buckle 18, the buckle 18 can be rotatably mounted around the longitudinal axis 55 (shown in FIG. 3) of the vehicle and the cross axis 56 of the vehicle. That is, the buckle 18 can swing in the front-back direction of the vehicle and in the left-right direction of the vehicle. For this reason, as shown in FIG. 2, the buckle 18 can be moved along the guide rails 40 even if the guide rails 40 are mounted diagonally so as to approach the seat 1 toward the rear of the vehicle.

The operation of the above-described seat belt buckle device (first embodiment) will now be described. FIG. 5 (a),
(B) is a first action explanatory view of the buckle device for a seat belt (first embodiment) according to the present invention. In (a),
When the deceleration of the vehicle exceeds a predetermined value, a large amount of gas is generated in the gas generating unit 31, and this gas flows into the cylinder 33 as indicated by an arrow. The piston 34 moves as indicated by the arrow, and the cable 37 pulls the first slider 45 along the guide rail 40 as indicated by the arrow in a direction substantially parallel to the floor 4 (see FIG. 1). As a result, the buckle 18 is
Then, the seat belt 14 is pulled in as indicated by the arrow. In addition, 1
4c indicates the seat belt axis.

In (b), the piston 34 that has moved to the end of the cylinder 33 is locked by hooking the lock member 35 on the lock claw 36. As a result, the first slider 45 can be held at the rear end of the guide rail 40. At this time, together with the first slider 45, the second slider 50 also moves backward from the position (a) by L1 to the vehicle,
The seat belt axis 14c moves to the rear of the vehicle. For this reason, the seat belt pull angle decreases from α1 to α2.

FIG. 6 is a view for explaining a second operation of the buckle device (first embodiment) for a seat belt according to the present invention. When the seat belt tension T exceeds the set value, the plastic deformation member 5
3 is collapsed, and the second slider 50 moves to the front of the vehicle along the first slider 45 as shown by an arrow. As a result, the buckle 18 and the seat belt 14 together with the rod 19 can be pulled out to the front of the vehicle as shown by the arrow, so that the impact energy acting on the occupant can be reduced by sufficiently absorbing the impact energy.

Since the seat belt 14 is retracted by the first slider 45 and the impact energy is absorbed by the second slider 50, the seat belt 14 is independent of the retracting performance and the impact energy absorbing performance. Can be set individually. As a result, each performance can be easily set to a desired performance.

FIG. 7 is an explanatory view of a third operation of the buckle device for a seat belt (first embodiment) according to the present invention, and shows a state before the buckle device for a seat belt operates. Note that the seat belt pull angle α1 is relatively large. When the deceleration of the vehicle exceeds a predetermined value, as described in FIG.
The seat belt 14 is retracted together with the buckle 18 as shown by the arrow.

FIGS. 8 (a) and 8 (b) are views for explaining a fourth operation of the buckle device (first embodiment) for a seat belt according to the present invention, and FIG. is there. In (a), the buckle 18 is moved to a predetermined position at the rear of the vehicle by L1, the slack of the seat belt 14 is instantaneously removed, and the occupant 11 is restrained. Buckle device 20 for seat belt
By moving the buckle 18 to the rear of the vehicle by L1, the seat belt pulling angle connected to the buckle 18 becomes α1.
(See FIG. 7), it becomes as small as α2. In (b),
The state where the buckle 18 has approached the occupant 11 by L2 is shown. The seat belt 14 becomes a shoulder belt 14a in a range between the through anchor 58a and the tongue 58b, and a waist belt 14b in a range between the tongue 58b and the anchor plate 58c.

FIG. 9 is a sectional view taken along the line 9-9 in FIG. The buckle 18 is moved L1 to the rear of the vehicle by the buckle device 20 for the seat belt, and the pulling angle of the seat belt connected to the buckle 18 is reduced to α2 (see FIG. 8A). Therefore, the direction of the seat belt tension acting on the shoulder belt 14a changes from the direction indicated by the imaginary line to the direction indicated by the solid line. Therefore, the resultant force T6 of the seat belt tensions T5 and T5
Can be suppressed as small as the deviation angle θ2 with respect to the direction of the inertial force T7 acting on the occupant 11. As a result, the seat belt tensions T5 and T5 generated by the operation of the pretensioner of the seat belt buckle device 20 can be effectively applied.

The driving force generating means 3 of the buckle device 20 for the seat belt which generates the seat belt tension by effectively applying the seat belt tensions T5 and T5.
0 can also be achieved. Further, since the first slider 45 (see FIG. 3) moves rearward along the guide rail 40 by L1 and moves closer to the seat by L2, the seat belt pulling angle (see FIGS. 7 and 8).
(See (a)) is reduced from α1 to α2, and the seat belt 14 is wound around the waist of the occupant 11, so that the restraining force of the occupant 11 can be further improved.

FIG. 10 is a view for explaining a fifth operation of the seat belt buckle device (first embodiment) according to the present invention. When the seat belt tension T exceeds a set value while the occupant 11 is restrained, FIG. As described in FIG. 6, the state where the seat belt 14 is pulled out to the front of the vehicle as shown by the arrow together with the buckle 18 is shown. Since the buckle 18 can be moved to the front of the vehicle according to the tension of the seat belt 14, the shoulder belt 14a and the waist belt 14b connected to the buckle can be moved to the front of the vehicle. As a result, the impact energy acting on the chest and waist of the occupant 11 can be reduced by sufficiently absorbing the impact energy.

Next, in FIGS.
An example will be described. In the first embodiment, the structure in which the plastic deformation member 53 of the second slider 50 is crushed to absorb the impact energy has been described.
An example will be described. In the second to eighth embodiments, the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 11 is a sectional view of a buckle device for a seat belt (second embodiment) according to the present invention. In the buckle device 60 for a seat belt, a partition wall 61 is attached to the first slider 45, and the second slider 50 is fixed in the first slider 45 by the partition wall 61. Seat belt tension T
Exceeds the set value, the partition wall 61 is destroyed and the second
The slider 50 moves forward of the vehicle along the first slider 45. As a result, the impact energy acting on the occupant can be reduced by absorbing the impact energy.

FIG. 12 is a sectional view of a buckle device (third embodiment) for a seat belt according to the present invention. In the buckle device 65 for a seat belt, the cylindrical body 67 of the first slider 66 is formed to be thinner toward the front of the vehicle, and the slider unit 69 of the second slider 68 is formed in a truncated cone. When the seat belt tension T exceeds the set value, the slider unit 69 moves toward the front of the vehicle while expanding the cylinder 67. As a result, the impact energy acting on the occupant can be reduced by absorbing the impact energy.

FIG. 13 is a sectional view of a buckle device (fourth embodiment) for a seat belt according to the present invention. The buckle device 70 for a seat belt includes a compression spring 71 disposed in a first slider 45, and the compression spring 71 presses a second slider 50 against the first slider 45. When the seat belt tension T exceeds the set value, the compression spring 71 compresses and the second slider 50 moves forward of the vehicle along the first slider 45. As a result, the impact energy acting on the occupant can be reduced by absorbing the impact energy.

FIG. 14 is a sectional view of a buckle device (fifth embodiment) for a seat belt according to the present invention. The seat belt buckle device 75 is provided with a fluid 76 in the first slider 45.
And the second slider 77 is provided with an orifice 77a. Reference numeral 78 denotes a bellows for preventing fluid leakage. When the seat belt tension T exceeds the set value, the fluid 76 flows through the orifice 77a as shown by the arrow, so that the second slider 77
The vehicle moves forward along 5. As a result, the impact energy acting on the occupant can be reduced by absorbing the impact energy.

FIG. 15 is a sectional view of a buckle device (sixth embodiment) for a seat belt according to the present invention. The seat belt buckle device 80 has a plurality of buffer plates 81... Mounted at predetermined intervals in the first slider 45, and the rear buffer plate 8.
1, the second slider 50 is fixed. When the seat belt tension T exceeds the set value, the buffer plates 81 are sequentially destroyed, so that the second slider 50 moves forward of the vehicle along the first slider 45. As a result, the impact energy acting on the occupant can be reduced by absorbing the impact energy.

FIG. 16 is a sectional view of a buckle device (seventh embodiment) for a seat belt according to the present invention. The seat belt buckle device 85 has a lock piece 86 attached to the rear end of the second slider 50, and a bent portion 86 a of the lock piece 86 is hooked on a hook 88 of the first slider 87. When the seat belt tension T exceeds the set value, the lock piece 86
The second slider 50 moves forward along the first slider 87 along with the first slider 87. As a result, the impact energy acting on the occupant can be reduced by absorbing the impact energy.

FIG. 17 is a sectional view of a buckle device for a seat belt (eighth embodiment) according to the present invention. The buckle device 90 for a seat belt has a lock claw 92 provided on an inner periphery of a guide rail 91, and a lock member 93 which is engaged with the lock claw 92.
Are provided on the first slider 94. As in the first embodiment, it is not necessary to provide a lock claw on the cylinder 33 of the driving force generating means 30 and provide a lock member on the piston 34.

In the above embodiment, the guide rails 40 are attached to the seat cushion 6. However, the guide rails 40 may be attached to the vehicle 2.

In the above-described embodiment, the description has been given of the case where the first slider 45 is moved rearward of the vehicle substantially parallel to the floor 4 (see FIG. 1). A configuration in which the slider 45 is moved is also possible. In short, the base end of the buckle 18 is positioned at the seat belt axis 14c (see FIGS. 5A and 5B).
What is necessary is just to move to the back of a vehicle.

In the above-described embodiment, as shown in FIG. 4, the rod 19 of the buckle 18 is connected to the spherical portion 52a of the pin 52 to swing the buckle 18 in the left-right direction of the vehicle. Alternatively, the buckle 18 may be swung in the left-right direction of the vehicle using a flexible member. As the flexible member, for example, there is a flexible member in which a core wire is covered with an elastic member such as a flexible resin or rubber.

[0042]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect, by moving the first slider to the rear of the vehicle, the seat belt approaches the horizontal, and the pulling angle of the seat belt connected to the buckle decreases. For this reason, the resultant force of the seat belt tension can be made closer to the direction opposite to the direction of action of the inertial force acting on the occupant. As a result, the seat belt tension can be effectively applied as the restraining force of the occupant, and the occupant can be reliably protected. Further, even if the seat belt tension is kept small, a resultant force according to the inertia force of the occupant can be obtained, so that downsizing of the driving means can be achieved.

Further, when the seat belt tension exceeds the set value, the impact energy acting on the occupant can be absorbed by the second slider by moving the second slider forward of the vehicle. Also, the seat belt is moved to the rear of the vehicle by the first slider via the buckle, and the impact energy is absorbed by the second slider.
The occupant restraint performance and the impact energy absorption performance can be set independently of each other. As a result, since each performance can be easily set to a desired performance, a high quality product can be obtained.

According to a second aspect of the present invention, since the first slider moves so as to approach the seat while moving to the rear of the vehicle, the seat belt pulling angle is made smaller and the waist belt of the seat belt is wound around the waist of the occupant. So that it can be pulled. For this reason, the restraint force of the occupant is further improved,
The occupant can be reliably protected.

[Brief description of the drawings]

FIG. 1 is a perspective view of a seat to which a seat belt buckle device (first embodiment) according to the present invention is attached.

FIG. 2 is a plan view of the seat to which the seat belt buckle device according to the present invention (first embodiment) is attached.

FIG. 3 is a sectional view of a buckle device (first embodiment) for a seat belt according to the present invention.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

FIG. 5 is a first operation explanatory view of the seat belt buckle device (first embodiment) according to the present invention;

FIG. 6 is a second operation explanatory view of the seat belt buckle device (first embodiment) according to the present invention.

FIG. 7 is a third operation explanatory view of the buckle device for a seat belt (first embodiment) according to the present invention.

FIG. 8 is an explanatory view of a fourth operation of the buckle device for a seat belt (first embodiment) according to the present invention.

FIG. 9 is a sectional view taken along line 9-9 of FIG. 8 (b).

FIG. 10 is a diagram illustrating a fifth operation of the buckle device for a seat belt according to the present invention (first embodiment).

FIG. 11 is a sectional view of a buckle device (second embodiment) for a seat belt according to the present invention.

FIG. 12 is a sectional view of a buckle device (third embodiment) for a seat belt according to the present invention.

FIG. 13 is a sectional view of a buckle device for a seat belt (fourth embodiment) according to the present invention.

FIG. 14 is a sectional view of a buckle device (fifth embodiment) for a seat belt according to the present invention.

FIG. 15 is a sectional view of a buckle device (sixth embodiment) for a seat belt according to the present invention.

FIG. 16 is a sectional view of a buckle device for a seat belt (seventh embodiment) according to the present invention.

FIG. 17 is a sectional view of a buckle device for a seat belt according to the present invention (eighth embodiment).

FIG. 18 is an explanatory view of a conventional seat belt device (a device in which a pretensioner and an EA mechanism are incorporated in a winding device).

FIG. 19 is an explanatory view of a conventional seat belt device (a device in which a pretensioner and an EA mechanism are provided in a buckle device).

20 is a sectional view taken along line 20-20 in FIG. 18;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... seat, 2 ... vehicle, 6 ... seat cushion (seat frame), 11 ... occupant, 14 ... seat belt, 18 ...
Buckle, 19 ... Rod (base end), 20, 60, 6
5, 70, 75, 80, 85, 90: buckle device for seat belt, 30: driving force generating means (driving means), 4
0, 91: guide rail, 45, 94: first slider,
50: second slider, T: seat belt tension.

Claims (2)

[Claims] 1. A buckle device for a seat belt for ensuring safety of an occupant, a driving means for generating a driving force in response to a deceleration of a vehicle, a guide rail fixed to a seat frame or a vehicle, and the driving force The first slider connected to the guide rail so as to move rearward of the vehicle along the guide rail is connected to the base end of the buckle, and the first slider is moved when the seat belt tension exceeds a set value. A buckle device for a seat belt, comprising: a second slider connected so as to be relatively movable forward of the vehicle. 2. A base end portion of the buckle is connected to a second slider so as to be swingable in a front-rear direction and a left-right direction of the vehicle, and the guide rail is attached to a seat as it goes rearward of the vehicle. The buckle device for a seat belt according to claim 1, wherein the buckle device is arranged to approach.