JP2007176311A - Buckle structure of seat belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buckle structure of a seat belt for a seat equipped with a buckle to move interlocking with a forward tilt of a seat back, capable of precluding occurrence of the buckle interfering with the occupant when seated. <P>SOLUTION: The buckle structure 61 of the seat belt 11 is equipped with a tilting mechanism 95 to tilt the left buckle body 67 or center buckle body 68 of the seat belt 11 in such a way as interlocking with the forward tilting operation of the seat back 52 coupled with the seat cushion 48 with possibility of tilting forward, and with a coupling mechanism 65 to couple the seat back 52 with the left and center buckle bodies 67 and 68 through an energizing means 97. When the occupant re-seats himself deeper, the left and center buckle bodies 67 and 68 rotate against the buckle energizing means 66 to reduce stimulus. Also it is possible to preclude interference with the occupant M1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seat belt buckle structure for protecting a passenger from an impact.

A seat belt (seat belt device) attaches a belt (webbing) disposed on a seat in advance to restrain an occupant and protect the occupant when an impact occurs on the vehicle.
In the seat belt device, a structure is known in which a buckle used when a belt (webbing) is attached is disposed in the vicinity of the seat cushion, and the buckle is folded together when the seat is folded (for example, Patent Document 1). reference.).
Japanese Utility Model Publication No. 63-130334 (page 8, FIG. 1)

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a diagram for explaining a basic configuration of the conventional technique. In the conventional vehicle seat structure 201, when the seat back 202 is tilted forward, the wire 203 connected to the seat back 202 is pulled, and the bolt nut 204 is pulled. Since the buckle 205 is rotated about the rotation center, the skin member 206 of the seat back 202 does not touch the buckle 205. On the contrary, when the seat back 202 is raised and returned, the buckle 205 is returned to the original position by the coil spring 207. Therefore, the seat back 202 does not touch the buckle 205, and damage to the seat back 202 can be prevented.

  However, in the vehicle seat structure 201 of Patent Document 1, when the buckle 205 is adopted for a three-seat bench seat, the occupant may get on the buckle 205 disposed in the center of the three-seat bench seat, which impairs comfort. There is a fear. That is, when the buckle 205 is disposed on the center side of the bench seat for three persons and an occupant sits on the buckle 205, the buckle 205 extends by pulling the coil spring 207 and falls down. However, when the hips are slid back as shown by the arrow y 1 when sitting down and then sitting down deeply, the hips interfere with the buckle 205. Since the buckle 205 is stopped by the wire 203, it does not rotate (in the direction of the arrow y2). As a result, the comfort of the seat is reduced.

  An object of the present invention is to provide a seat belt buckle structure that prevents interference between a buckle and an occupant when seated, in a seat provided with a buckle that interlocks with the forward tilt of the seat back.

  According to a first aspect of the present invention, there is provided a seat belt buckle structure including a fall mechanism that tilts a buckle of a seat belt in conjunction with a forward tilting operation of a seat back that is connected to the seat cushion so as to be able to tilt forward. And a buckle are provided through a biasing means.

  The invention according to claim 2 is characterized in that the overturning mechanism includes buckle urging means for urging the buckle in the overturning direction, and the urging force of the buckle urging means is set weaker than the urging means.

  In the invention according to claim 1, in the seat belt buckle structure provided with the overturning mechanism that tilts the buckle of the seat belt in conjunction with the forward tilting operation of the seat back connected to the seat cushion so as to be able to tilt forward. Since there is a connecting mechanism that connects the buckle and the buckle via the biasing means, if you do not perform the operation of tilting the seat back forward, for example, when the occupant sits down, If the hips come into contact with the buckle when sliding and sitting deeply, the buckle rotates toward the seat back, reducing the sense of discomfort felt by the hips. For example, when this buckle structure is disposed at the center of a foldable three-seat bench seat, it is possible to prevent interference with a seated passenger. Therefore, in the seat provided with the buckle interlocking with the forward tilt of the seat back, there is an advantage that interference between the buckle and the occupant can be prevented when sitting.

  Subsequently, when the occupant raises the buttocks in order to sit back in the correct position, the buckle returns to the direction away from the seat back, that is, to the original position by the overturning mechanism that tilts the buckle, so that it does not take time to wear the seat belt. Therefore, the operability of the seat belt can be ensured.

  Further, when an occupant sits on the buckle, the buckle can be tilted away in a direction away from the seat back, that is, against the urging means of the connecting mechanism connected to the seat back. For example, when this buckle structure is disposed at the center of a foldable three-seat bench seat, it is possible to prevent interference with a seated passenger. Therefore, in the seat provided with the buckle interlocking with the forward tilt of the seat back, there is an advantage that interference between the buckle and the occupant can be prevented when sitting.

  Subsequently, when the occupant raises his buttocks in order to sit back in the correct position, the buckle is caused by the urging means of the coupling mechanism connected to the seat back, so the buckle returns to its original position and when the seat belt is worn It does not take time. Therefore, the operability of the seat belt can be ensured.

  In the invention according to claim 2, since the overturning mechanism is provided with buckle urging means for urging the buckle in the overturning direction, and the urging force of the buckle urging means is set weaker than the urging means, the buckle urging means The buckle that has been tilted forward can be caused by the urging force of the urging means against the buckle urging means. Therefore, there is an advantage that it can be surely caused to the original position in conjunction with the seat back.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an explanatory view of a seat belt device employing the buckle structure of the present invention.
A seat belt device (seat belt) 11 is employed for a three-seat bench seat 12, and includes a left seat belt device 14 for a left seat 13, a central seat belt device 16 for a central seat 15, and a right seat 17. Right seat belt device 18.

  The left seat belt device 14 is a three-point seat belt, and is fixed to the floor 24 of the vehicle body 23 in order to support the winding device 21, the webbing 22 wound up by the winding device 21, and the webbing 22 on the left side of the left seat 13. A left lower attachment member 25 and a left buckle structure 26 fixed to a floor 24 below the center of the bench seat 12 to support the webbing 22 on the right side of the left seat 13 and in the center of the bench seat 12 are provided.

  The central seat belt device 16 is a three-point seat belt. The winding device (not shown), the webbing 32 wound up by the winding device, and the floor 24 for supporting the webbing 32 on the right side of the central seat 15 are provided. A fixed central lower mounting member 34 and a central buckle structure 35 fixed to the floor 24 to support the webbing 32 on the left side of the central seat 15 are provided.

  The right seat belt device 18 is a three-point seat belt, a winding device 41, a webbing 42 that is wound up by the winding device 41, and a lower right mounting that is fixed to the floor 24 to support the webbing 42 on the right side of the right seat 17. A member 44 and a right buckle structure 45 fixed to the floor 24 to support the webbing 42 on the left side of the right seat 17 are provided.

  The three-seat bench seat 12 is a split type, and seat mounting devices 47 and 47 attached to the floor 24, a long seat cushion 48 attached to the seat mounting devices 47 and 47, and four supports on the seat cushion 48. A long seat back 52 connected to the mechanism 51... (Where plural indicates... The same applies hereinafter) that can be tilted forward (in the direction of arrow a1, see also FIG. 3), and these seat cushions. 48 and the left seat 13 set in the seat back 52, a central seat 15 connected to the left seat 13, and a right seat 17 connected to the central seat 15.

  The left seat 13 is obtained by dividing the three-seat bench seat 12 and has a holding portion 54 for suppressing the left and right movement of the occupant at the edge of the seat cushion 48.

FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1 and shows the left seat 13, the left buckle structure 26, and the central buckle structure 35.
The left seat 13 also has a front opening edge 55 formed in the holding portion 54 of the seat cushion 48 at a distance B1 away from the left and center buckle structures 26 and 35, and a rear opening edge 56 in the seat back 52. It was formed away from the structures 26 and 35 by a distance B2. B3 (B3> B2) indicates the distance from the left / center buckle structure 26, 35 to the support mechanism 51.
Here, a structure including the left buckle structure 26 and the central buckle structure 35 is referred to as a buckle structure 61.

FIG. 3 is a view taken in the direction of the arrow 3 in FIG. 1 and shows the front of the buckle structure 61.
The buckle structure 61 has an anchor bracket 62 fixed to the floor 24 located in the vicinity of the rear end of the seat cushion 48, a left stay 63 (see FIG. 5) and a center stay 64 attached to the anchor bracket 62, and a coupling mechanism to the center stay 64. One end of 65 is hooked, the other end of the coupling mechanism 65 is hooked to the seat back 52, and the buckle biasing means 66 is hooked to the left stay 63.

Further, when the left seat belt device 14 or the central seat belt device 16 is not attached, the buckle structure 61 has a left buckle body 67 (see FIG. 2) of the left seat belt device 14 and a central buckle body 68 of the central seat belt device 16. Is held at the buckle standby position E. Details will be described later.
At the buckle standby position E, the left buckle main body 67 (see FIG. 2) and the central buckle main body 68 are moved upward by a distance H from the seat cushion 48, thereby ensuring the operability of the buckle.

  The seat attachment device 47 attaches a bracket 71 for the seat back 52 to the floor 24, attaches the seat back 52 to the bracket 71 in a rotatable manner (in the direction of arrow a2), attaches a leg support member 72 to the floor 24, and supports the legs. One end of the leg main body 73 is attached to the member 72 so as to be rotatable (in the direction of arrow a3), and the other end of the leg main body 73 is freely rotatable in the frame (not shown) of the bench seat 12 (in the direction of arrow a4). The leg body 73 is rotated when the seat back 52 is folded forward (in the direction of the arrow a1) and folded. C is the position of the seat cushion 48 when the occupant sits on the three-seat bench seat 12, and is the seating position of the seat cushion 48, and B is the position of the seat back 52 when the occupant sits on the three-seat bench seat 12. There is a seating position of the seat back 52.

4 is a cross-sectional view taken along line 4-4 of FIG. 3, and shows a state in which the coupling mechanism 65 is attached to the seat back 52. FIG.
FIG. 5 is an exploded view of the buckle structure of the present invention. 1 to 4 will be used in combination.

  Specifically, the buckle structure 61 has a reinforcing plate (not shown) attached to the outer surface of the floor 24, a nut 76 fixed to the lower surface of the reinforcing plate, and a bolt 77 attached to the nut 76 with a predetermined axial force (for example, The anchor bracket 62 is attached by screwing in the torque management), the fulcrum shaft 78 is fitted to the anchor bracket 62, the left stay 63 is rotatably fitted to the fulcrum shaft 78 via the bearing 81, and the bearing is supported on the fulcrum shaft 78. The central stay 64 is rotatably fitted via 82, the winding portion 83 of the buckle urging means 66 is fitted to the fulcrum shaft 78, and one end 84 of the buckle urging means 66 is hung on the anchor bracket 62, and the buckle urging means 66 is fitted. The other end 85 was hung on the left stay 63 and the collar 86 was fitted to the fulcrum shaft 78.

  The buckle structure 61 also has a left buckle body 67 fixed to the left stay 63, a detection device cable (not shown) built in the left buckle body 67 is attached to the left stay 63 with a band, and is attached to the center stay 64. The central buckle body 68 was fixed, and the cable of the detection device built in the central buckle body 68 was fixed to the central stay 64 with a band.

  The left buckle structure 26 includes a fall mechanism 95. The fall mechanism 95 includes a left stay 63 that can be tilted forward (in the direction of the arrow a1), a buckle urging means 66 that applies a forward tilting force to the left stay 63, and Consists of.

  The coupling mechanism 65 includes an urging means 97 having one end hung on the central stay 64 and a latching member 101 having the other end of the urging means 97 hung, and the latching member 101 is attached to the frame 102 of the seat back 52. The bolt 103 is attached so as to be freely rotatable (in the direction of arrow a5).

The urging means 97 stands in the standing direction (indicated by an arrow a6) from the state where the central buckle body 68 is tilted forward together with the central stay 64 (see FIGS. 6 and 8B) toward the buckle standby position E (see FIG. 3). Direction), for example, a tension spring, and the biasing force (spring output) is set to Fr.
The urging means 97 may be other than the tension spring, and may be any one that expands and contracts and applies the urging force Fr.

  The buckle urging means 66 tilts the left buckle body 67 together with the left stay 63 forward from the buckle standby position E (in the direction of the arrow a1) and tilts forward (see FIGS. 6 and 8B). For example, it is a torsion spring and the biasing force (spring output) is set to Ff. The biasing force Ff of the buckle biasing means 66 is set to be weaker than the biasing force (spring output) Fr of the biasing means 97.

  The connecting mechanism 65 (see FIG. 4) also fixes the boss member 104 to the frame 102 of the seat back 52 with, for example, a welded portion 105, screws the bolt 103 into the boss member 104, and hooks the bolt 103 through the bearing 106. The urging means 97 is hooked on the seat back 52 by fitting the stopper member 101 and fitting the collar 107 to the bolt 103. As a result, the latch member 101 is freely rotatable by the bearing 106 (in the direction of arrow a5 in FIG. 3), and moves in the left buckle main body 67 and the central buckle main body 68 (in the directions of arrows b2 and b3 in FIG. 6, arrow b5 in FIG. 7). The left buckle body 67 and the central buckle body 68 can be smoothly pulled up (in the direction of arrow b3 in FIG. 6) and moved smoothly (in the direction of arrow b2 in FIG. 6, FIG. 7). The direction of the arrow b5, FIG. 8).

  As described above, the buckle structure 61 is composed of the left buckle structure 26 and the central buckle structure 35, and the parts such as the anchor bracket 62, the fulcrum shaft 78, the urging means 97, and the buckle urging means 66 are taken as one point. This is a configuration, and the number of parts can be reduced.

  The anchor bracket 62 includes a hole portion 111 having a diameter slightly larger than the diameter of the fulcrum shaft 78, a front stopper portion 112 formed at the upper portion, a convex portion 113 formed at the center, and a lug portion 114 formed at the rear end. And having. The front stopper 112 defines the maximum angle βm (see FIG. 8B) of the left stay 63 and the central stay 64 in the forward tilt direction (the direction of the arrow a1). One end 84 of the buckle urging means 66 is fixed to the convex portion 113, and the cable is fixed to the lug portion 114.

  The center stay 64 is formed with a latching portion 115 for applying a biasing means (a tension spring) 97 at the rear end thereof, and a center stopper portion 116 that directly contacts the front stopper portion 112 of the anchor bracket 62 is bent and formed at the center. The central buckle body 68 is stopped at the position of the maximum angle βm in the forward tilt direction (see FIG. 8B) by contacting. In addition, the center stopper 116 is rotated around the left stay 63.

  The left stay 63 forms a left stopper portion 117 that directly contacts the central stopper portion 116, and the left stay 63 is brought into contact with the left stay 63 so that the left buckle body 67 is positioned at the maximum angle βm in the forward tilt direction (see FIG. 8B). Stop. Further, the left stopper portion 117 is rotated around the central stay 64.

  The fulcrum shaft 78 forms a head flange 118 and a spring fitting portion 121 for supporting the winding portion 83 of the buckle urging means (torsional helical spring) 66, and is connected to the spring fitting portion 121 to form a shaft main body portion. 122 is formed with a diameter slightly smaller than the hole 111 of the anchor bracket 62, and the collar groove 123 is formed continuously with the shaft main body 122. The collar 86 is fitted into the collar groove 123.

The buckle structure 61 is configured by the left buckle structure 26 and the central buckle structure 35, but the left buckle structure 26 and the central buckle structure 35 may be configured separately.
The right buckle structure 45 (see FIG. 1) has a configuration substantially similar to that of the left buckle structure 26 when configured separately, but the configuration is arbitrary depending on conditions.

Next, the operation of the seat belt buckle structure of the present invention will be described.
FIG. 6 is a first action diagram for explaining the action of the buckle structure of the seat belt of the present invention. 1 and 3 will be used in combination.
When the occupant M sits on the left seat 13 of the three-seat bench seat 12, for example, when the waist is lowered as shown by the arrow b1 toward the center seat 15 side, the left buckle that protrudes a distance H upward from the seat cushion 48 The main body 67 and the central buckle main body 68 abut. At the same time, the left buckle body 67 and the central buckle body 68 are moved forward by the forward tilt angle θf as shown by the arrow b2 against the tension spring (biasing means) 97 of the coupling mechanism 65 by the pressing force Wf by the hip. The left buckle body 67 and the central buckle body 68 are brought into contact with the front opening edge 55 of the seat cushion 48 and stopped, so that the left buckle body 67 and the central buckle body 68 are sunk in the seat cushion 48 by a distance H, It does not pop out from the surface of the seat cushion 48. As a result, it is possible to prevent the left buckle main body 67 and the central buckle main body 68 disposed in the center of the three-seat bench seat 12 from interfering with the occupant M.

  Subsequently, when the occupant M raises his / her waist to re-sit to the correct position of the left seat 13, the left stay 63 (see FIG. 5) and the central stay 64 are raised by the tension spring (biasing means) 97 of the coupling mechanism 65. Return to the buckle standby position E (in the direction of arrow b3). At that time, the central stopper portion 116 of the central stay 64 abuts against the left stopper portion 117 of the left stay 63 (see FIG. 5) and pushes the left stay 63 together. When returning to the buckle standby position E, the tension spring (biasing means) 97 and the torsion spring (buckle biasing means) 66 are kept in balance, so the left buckle body 67 and the central buckle body 68 are connected by a two-dot chain line. It can be held at the buckle standby position E as shown by, and it does not take time when the seat belt is worn. Therefore, the operability of the seat belt can be ensured.

  The occupant M sits in the correct position of the left seat 13 and wears the left seat belt device 14. That is, by fitting the tongue plate 126 (see FIG. 1) of the buckle that has passed through the webbing 22 to the left buckle body 67, the load of the passenger applied to the webbing 22 can be transmitted from the left buckle body 67 to the floor 24 of the vehicle body 23. The occupant M can be restrained.

FIG. 7 is a second action diagram for explaining the action of the buckle structure of the seat belt of the present invention.
In addition, depending on the occupant M1, when the seat butt is slid as shown by the arrow b4 after sitting shallowly on the left seat 13 of the three-seat bench seat 12 and then sitting back deeply, the butt is moved to the left buckle body 67 and the center buckle. Abuts on the main body 68. At the same time, the left buckle main body 67 and the central buckle main body 68 are rearwardly moved toward the rear seat back 52 as shown by an arrow b5 against the torsional helical spring (buckle biasing means) 66 by the pressing force Wr by the hip. Since it rotates only by rotation angle (theta) r, the irritation | stimulation which passenger | crew M1 receives can be reduced. That is, it is possible to prevent the left buckle main body 67 and the central buckle main body 68 arranged at the center of the three-seat bench seat 12 from interfering with the occupant M1.

  The left buckle body 67 and the central buckle body 68 are in contact with the rear opening edge 56 at the same time as the rearward rotation angle θr is rotated backward, and the rotation is stopped. Subsequently, when the occupant M1 feels a sense of discomfort and raises the buttocks, the left stay 63 (see FIG. 5) and the central stay 64 are indicated by a two-dot chain line at the buckle standby position E by the torsion spring (buckle biasing means) 66. To return. At that time, the left stopper portion 117 of the left stay 63 (see FIG. 5) abuts against the central stopper portion 116 of the central stay 64 (see FIG. 3) and pushes the central stay 64 together. When returning to the buckle standby position E, the tension spring (biasing means) 97 and the torsion spring (buckle biasing means) 66 are kept in balance, so the left buckle body 67 and the central buckle body 68 are connected by a two-dot chain line. It can be held at the buckle standby position E as shown by, and it does not take time when the seat belt is worn. Therefore, the operability of the seat belt can be ensured.

  The occupant M1 sits in the correct position on the left seat 13 and wears the left seat belt device 14 as described above.

FIGS. 8A to 8C are third operation diagrams for explaining the operation of the seat belt buckle structure of the present invention. 1 to 5 will be used together for explanation.
In (a), the lock (not shown) of the seat back 52 of the left seat 13 obtained by dividing the three-seat bench seat 12 is released, and the seat back 52 is moved forward from the seating position B of the seat back 52 with an arrow. Since the pulling force by the coupling mechanism 65 becomes zero when it starts to fall like a1, the left stay 63 and the central stay 64 are moved forward from the buckle standby position E by the biasing force of the torsional helical spring (buckle biasing means) 66. It begins to fall as indicated by arrow b6.

  In (b), when the seat back 52 is tilted forward from the seating position B at the intermediate position B1 and by the dive down angle αs (for example, αs = 60 °), the center stay 64 is moved to the front stopper portion 112 of the anchor bracket 62. The left stopper portion 117 of the left stay 63 contacts the central stopper portion 116 at the same time as the central stopper portion 116 contacts.

That is, when the left stay 63 is rotated (in the direction of the arrow b6) by the biasing force of the torsion coil spring (buckle biasing means) 66 in the process of tilting by the dive down angle αs (for example, αs = 60 °), the left stay The left stopper portion 117 63 pushes the central stopper portion 116 of the central stay 64 and rotates together by the dive down angle αs to press the central stopper portion 116 against the front stopper portion 112, so that it stops at the maximum angle βm.
That is, the left buckle body 67 and the central buckle body 68 are tilted forward in conjunction with the forward movement of the seat back 52.

At the same time, the seat cushion 48 is moved by the support mechanism 51 from the seating position C of the seat cushion 48 to the front intermediate position C1.
On the other hand, the support mechanism 51 moves together with the seat cushion 48 and starts to pass in front of the central buckle body 68 that has already stopped at the front stopper portion 112.

  In (c), when the seat back 52 continues to be tilted forward, the support mechanism 51 passes through the front of the central buckle body 68 that is already stationary, and the seat back 52 stops at the folding position Bd of the seat back 52. And stop at the same time. In addition, the seat back 52 stops at the folding position Bd of the seat back 52 and at the same time, the seat cushion 48 stops at the folding position Cd of the seat cushion 48. The folding position Bd of the seat back 52 is the maximum dive down angle αm (for example, αm = 108 °) of the seat back 52. As a result, even if the buckle structure 61 is employed, the seat back 52 of the left seat 13 of the three-seat bench seat 12 can be folded forward and folded without interfering with the buckle structure 61.

  Thus, in the buckle structure 61 of the seat belt (seat belt device) 11, the seat belt is interlocked with the forward tilting operation of the seat back 52 connected to the seat cushion 48 so as to be able to tilt forward (in the direction of the arrow a <b> 1). 11 is provided with an overturning mechanism 95 that tilts down the left buckle body (buckle) 67 or the central buckle body (buckle) 68, and connects the seat back 52 and the left and center buckle bodies 67, 68 via the biasing means 97. 65, so when sitting on the left seat 13 of the bench seat 12, when the hips come into contact with the left buckle body 67 and the central buckle body 68 when sitting back to the center and then sitting back deep, The central buckle bodies 67 and 68 have a rearward rotation angle θr toward the seat back 52 against the torsional helical spring (buckle biasing means) 66. It rotates, it is possible to reduce the irritation experienced by the occupant M1. That is, it is possible to prevent the left buckle main body 67 and the central buckle main body 68 arranged at the center of the three-seat bench seat 12 from interfering with the occupant M1.

  Subsequently, when the occupant M1 feels a sense of discomfort and raises the buttocks, the left and center buckle bodies 67 and 68 are returned to the buckle standby position E as indicated by a two-dot chain line by a torsion spring (buckle urging means) 66. . Therefore, the operability of the seat belt can be ensured.

  Even if the buckle structure 61 is employed in the center of the seat cushion 48 of the foldable three-seat bench seat 12, the support mechanism 51 and the buckle structure 61 that support the seat back 52 when the seat back 52 is tilted forward. Interference with can be prevented.

Next, the operation of the buckle structure 61 of the seat belt (seat belt device) 11 when the folded seat is returned will be described with reference to FIG.
In the case where the seat back 52 is returned and stood up, the mechanism is the reverse of the above-described mechanism of tilting forward. That is, the seat back 52 in the state shown in (c) is caused to start (opposite to the direction of the arrow a1).

  When the seat back 52 is raised to the position (intermediate position B1) of the dive down angle αs (for example, αs = 60 °) shown in (b), it is pulled to the central stay 64 that supports the central buckle body 68 via the coupling mechanism 65. Power begins to be applied. In the process so far, the left stay 63 supporting the left buckle body 67 is continuously applied with the urging force of the torsion spring (buckle urging means) 66, so that the left and center buckle bodies 67 and 68 are stationary. .

  Subsequently, when the seat back 52 is raised, the central stay 64 that supports the central buckle main body 68 is started to be raised by the connecting mechanism 65 connected to the seat back 52, and is further generated in synchronization with the seat back 52. At that time, the urging force Fr (Fr) of the tension spring (biasing means) 97 of the coupling mechanism 65 against the urging force Ff of the torsion coil spring (buckle urging means) 66 that has left the left buckle body 67 stationary. > Ff) pulls the central buckle main body 68 (central stay 64), so that the left and central buckle main bodies 67 and 68 get up toward the buckle standby position E.

  When the central buckle body 68 (central stay 64) is pulled by the tension spring (biasing means) 97 of the coupling mechanism 65, the central stopper portion 116 of the central stay 64 moves the left stopper portion 117 of the left buckle body 67 (left stay 63). Since it is pushed (see FIG. 5), the left buckle body 67 (left stay 63) is also raised by the tension spring (biasing means) 97.

  Thus, the overturning mechanism 95 includes the buckle urging means 66 for urging the left buckle main body 67 or the central buckle main body 68 in the overturning direction (the direction of the arrow a1 in FIG. 8), and the urging force of the buckle urging means 66 is provided. Since Ff is set to be weaker than the urging force Fr of the urging means 97, the urging means urges the left buckle body 67 or the central buckle body 68 that has been tilted forward by the buckle urging means 66 against the buckle urging means 66. As a result, the left buckle body 67 or the central buckle body 68 can be reliably raised to the original position (buckle standby position E) in conjunction with the seat back 52.

  The seat belt buckle structure of the present invention is applied to a foldable three-seat bench seat in the embodiment, but may be applied to other seats.

  The buckle structure of the seat belt of the present invention is suitable for a seat provided with a buckle that interlocks with the forward tilt of the seat back.

Explanatory drawing of the seatbelt apparatus which employ | adopted the buckle structure of this invention 2 arrow view of FIG. 1 arrow view of FIG. Sectional view taken along line 4-4 in FIG. Exploded view of buckle structure of the present invention First operation view for explaining the operation of the buckle structure of the seat belt of the present invention The 2nd operation figure explaining operation of the buckle structure of the seatbelt of the present invention The 3rd operation figure explaining the operation of the buckle structure of the seat belt of the present invention The figure explaining the basic composition of conventional technology

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Seat belt (seat belt apparatus), 42 ... Webbing, 48 ... Seat cushion, 52 ... Seat back, 61 ... Buckle structure, 65 ... Connection mechanism, 66 ... Buckle biasing means, 67 ... Buckle (left buckle main body), 68 ... (buckle) central buckle body, 95 ... fall mechanism, 97 ... biasing means, Ff ... biasing force of buckle biasing means, Fr ... biasing force of biasing means.

Claims (2)

In the seatbelt buckle structure with a fall mechanism that tilts the seatbelt buckle in conjunction with the seatback forward tilting operation connected to the seat cushion so that it can tilt forward,
A seat belt buckle structure comprising a connecting mechanism for connecting the seat back and the buckle through an urging means.   The seat according to claim 1, wherein the overturning mechanism includes buckle urging means for urging the buckle in the overturning direction, and the urging force of the buckle urging means is set to be weaker than the urging means. Belt buckle structure.

Images