JP4696910B2 - Seat belt device - Google Patents

Description

  The present invention relates to a seat belt device for restraining an occupant to a seat by webbing.

  Some retractors (winding devices) of a seat belt device are provided with a lock mechanism for preventing further pulling of the webbing when the webbing is suddenly pulled out. The lock by the lock mechanism is released when the webbing is wound up by a predetermined amount from the locked state.

  By the way, in such a seat belt device, when the webbing is taken up rapidly, a lock mechanism for preventing the webbing from being pulled out may be activated to cause an end lock. When this end lock occurs in a state where the webbing is completely wound on the retractor, it becomes difficult to unlock the webbing by winding the webbing on the retractor.

Therefore, as an end lock measure, the intermediate part of the webbing is wound around the winding member and the winding member is biased in the direction in which the bending angle of the webbing is increased, so that the retractor is released when releasing the webbing from the occupant. A technique for preventing the end lock by generating a resistance force against the webbing take-up force is proposed (for example, see Patent Document 1).
JP 2004-106561 A

  However, in the above-described conventional technology, the structure is such that when the occupant releases his hand from the webbing and the tension of the webbing becomes low, the above-mentioned resistance force is generated. For this reason, there is a concern that the time until the webbing is completely wound on the retractor is increased, and if the winding resistance is reduced in order to prevent this, it becomes difficult to prevent the end lock.

  In view of the above fact, an object of the present invention is to obtain a seat belt device capable of effectively preventing end lock.

According to the first aspect of the present invention, a winding device that winds up the other end of the webbing that is held by the seat or the vehicle body in a retractable manner and urges the webbing in the winding direction, and is fixed to the seat or the vehicle body. And a guide means for guiding the webbing so as to be displaceable in a webbing width direction between a drawn state and a wound state, and a displacement in the webbing width direction from the drawn state of the webbing to the wound state with respect to the guide means. And resistance means for applying resistance to winding of the webbing.

  In this seat belt device, tension is applied to the webbing by urging in the winding direction by the winding device, and the webbing restrains the occupant. When the occupant restraint state is released, the webbing is wound around the winding device by the urging force of the winding device.

The webbing is guided by a guide means fixed to the seat or the vehicle body so as to be displaceable in the webbing width direction between the pulled-out state and the wound-up state. Then, when the webbing is displaced in the webbing width direction in a state where the webbing is wound on the winding device, the resistance means causes resistance in winding the webbing. That is, the resistance means causes resistance in winding the webbing at the latest just before the complete winding of the webbing winding device. Thereby, the winding speed of the webbing is reduced, and end lock is prevented. From this point of view, the displacement (position) of the webbing in the drawn-out state and the wound-up state may be generated so as to be different from the drawn-out state over the entire time period of the taken-up state. It is sufficient that this displacement occurs in the winding straight line.

According to a second aspect of the present invention, in the first aspect of the present invention, the guide means has a longitudinal direction in the vehicle front-rear direction and a length in the longitudinal direction longer than the width of the webbing so that the webbing is inserted. In addition, the webbing has an opening located on the vehicle front side in the pulled-out state and located on the vehicle rear side in the wound-up state, and the resistance means is disposed only on the vehicle rear side with respect to the longitudinal center in the opening. It is characterized by being.

That is, the webbing is inserted through an opening whose longitudinal direction is the longitudinal direction of the vehicle. When the mounting of the webbing on the passenger is released , the webbing is displaced from the vehicle front side to the vehicle rear side in the opening. Since the resistance means is disposed only on the vehicle rear side of the opening in the longitudinal direction , resistance can be generated in winding the webbing using this displacement.

According to a third aspect of the invention, in the second aspect of the invention, the resistance means sets a large sliding resistance between the opening and the webbing in a direction in which the webbing is displaced from the drawn-out state to the wound-up state. It is comprised by doing.

  That is, by simply increasing the sliding resistance between the opening and the webbing, it is possible to reduce the webbing take-up speed and prevent end-locking without the need to add other members.

  In the present invention, the webbing may be moved (displaced) in direct contact with the inner surface of the opening, but another member may be interposed between the webbing and the inner surface of the opening. Regardless of the configuration, it is only necessary that the movement resistance of the opening with respect to the webbing is set to be large as a result.

According to a fourth aspect of the invention, in the invention of the second or third aspect , the resistance means is a narrow portion that partially narrows the opening width corresponding to the thickness of the webbing of the opening. It is characterized by being.

  That is, by simply reducing the opening width, it is possible to reduce the webbing take-up speed and prevent end-locking without the need to add another member or the like.

  Since the present invention has the above configuration, it is possible to effectively prevent end lock.

  A seat belt device 10 according to a first embodiment of the present invention will be described with reference to FIGS. It should be noted that arrows FR, UP, and IN that are appropriately shown in the drawings respectively indicate the front direction (traveling direction), the upward direction, and the inner side in the vehicle width direction of the vehicle as a vehicle body to which the seat belt device 10 is applied. .

  FIG. 1 is a perspective view showing a schematic overall configuration of the seat belt device 10. As shown in this figure, the seat belt device 10 is a so-called three-point seat belt device in which one webbing 12 comprises a lap webbing 12A for restraining the occupant's waist and a shoulder webbing 12B for restraining the occupant's upper body. It is said that.

  Specifically, the seat belt device 10 includes a retractor 14 as a winding device, and one end side of the webbing 12 is wound around a winding shaft (not shown) of the retractor 14 so that the webbing 12 can be pulled out. The retractor 14 incorporates a winding spring (not shown), and this winding spring biases the winding shaft in the winding direction of the webbing 12. In this embodiment, the retractor 14 is fixed to the lower portion of the vehicle body in the vehicle width direction outer portion, more specifically, to the lower portion of the center pillar 18 with respect to the seat 16 on which the restrained passenger is seated. Of course, the position of the retractor 14 is not limited to this, and may be, for example, the upper part of the center pillar 18 or the ceiling panel of the automobile.

  Further, the retractor 14 incorporates a lock mechanism (not shown) for preventing further pulling of the webbing 12 when the webbing 12 is pulled out suddenly. For example, the lock mechanism is configured such that the lock member provided on the take-up shaft is engaged with the frame by the relative rotation of the take-up shaft and the lock guide rotating body that is generated when the webbing 12 is suddenly pulled out. The shaft is prevented from rotating in the webbing pull-out direction.

  Further, for example, the lock guide rotator is configured such that a webbing sensor including an inertial body that cannot follow the sudden rotation of the take-up shaft engages the lock guide rotator by a follow-up delay of the inertial body with respect to the take-up shaft. The rotation in the pull-out direction is prevented and relative rotation with the winding shaft described above occurs. The retractor 14 is allowed to rotate in the webbing take-up direction of the take-up shaft in the locked state by the lock mechanism, and the engagement between the lock member and the frame is released by the rotation in the take-up direction. The

  On the other hand, the other end of the webbing 12 has a lap outer anchor 20 disposed below the retractor 14 (may not be below depending on the configuration of the seat belt device), that is, on the same side as the retractor 14 with respect to the seat 16. Via the vehicle body. The wrap outer anchor 20 supports the tension of the webbing 12. The lap outer anchor 20 is incorporated in the seat cushion 16C in a state of being rotatably supported and fixed to a frame member or the like of a seat (not shown) so that it cannot be seen from the outside. A wrap outer bezel 28 to be described later is fixed to the webbing 12 insertion portion of the outer surface of the seat cushion 16C, and the webbing 12 moves in the longitudinal direction through the opening 30 of the wrap outer bezel 28. The wrap outer bezel 28 closes the webbing 12 insertion portion of the seat cushion 16C leaving the opening 30, so that the appearance is improved.

  The seat belt device 10 includes a through anchor (shoulder anchor) 22 having an insertion hole 22A through which the webbing 12 is inserted. The through anchor 22 is supported on the vehicle body (upper part of the center pillar 18) at a position slightly above the passenger's shoulder above 14 and is configured to support the tension of the webbing 12. The through anchor 22 may be configured to be able to adjust the direction and height with respect to the vehicle body.

  The insertion hole 22A of the through anchor 22 is formed in a flat shape corresponding to the webbing 12, and prevents the webbing 12 passing therethrough from being twisted. An intermediate portion of the webbing 12 is slidably wound around the lower edge of the insertion hole 22A in the through anchor 22. Thus, the webbing 12 is supported by the through anchor 22 so that the tension direction is different between the retractor 14 side and the lap outer anchor 20 side of the through anchor 22.

  Further, a tongue plate 24 is provided at a portion of the webbing 12 between the lap outer anchor 20 and the through anchor 22. The tongue plate 24 is slidable (relative displacement along the longitudinal direction) with respect to the webbing 12 by inserting the webbing 12 through the insertion hole 24A. The tongue plate 24 can be engaged with and disengaged from a buckle 26 provided on the inner side in the vehicle width direction of the seat 16. That is, the tongue plate 24 is inserted into the buckle 26 and is locked to the buckle 26, and the locked state is released by pressing the release button 26A of the buckle 26.

  Therefore, in the seat belt device 10, when the tongue plate 24 is locked to the buckle 26, the portion of the webbing 12 between the tongue plate 24 and the lap outer anchor 20 constitutes the lap webbing 12 </ b> A, and the tongue plate in the webbing 12. A portion between the through anchor 22 and the through anchor 22 constitutes the shoulder webbing 12B.

  On the other hand, when the locked state of the tongue plate 24 and the buckle 26 is released, the webbing 12 is wound around the retractor 14 by the urging force of the winding spring of the retractor 14. The state in which the webbing 12 forms a substantially straight line along the vertical direction of the vehicle body between the lap outer anchor 20 and the through anchor 22 is wound up by the retractor 14 in the entire amount that can be wound around the retractor 14 in the webbing 12. The complete winding state.

  A lap outer bezel 28 fixed to the seat cushion 16C above the lap outer anchor 20 is provided with an opening 30 through which the webbing 12 is inserted, as shown in detail in FIGS. The opening 30 has a long hole shape, and the longitudinal direction of the opening 30 is substantially coincident with the vehicle front-rear direction. The width of the opening 30 (the length in the vehicle front-rear direction, see FIG. 3) W1 is longer than the width W2 (see FIG. 3) of the webbing 12, and the webbing 12 can be displaced in the vehicle front-rear direction in the opening 30. It has become. Here, as indicated by a two-dot chain line in FIGS. 2 and 3, when the webbing 12 is mounted, the webbing 12 is relatively positioned in the vehicle front side in the opening 30. Although this position may change in the vehicle front-rear direction depending on conditions such as the occupant's body shape and seating position, it is set so as not to move to the rear side of the vehicle to reach the second resistance portion 34 described later. Yes. In the winding state of the webbing 12, as shown by a solid line in FIG. 2 and a one-dot chain line in FIG. 3, the webbing 12 is displaced toward the vehicle rear side in the opening 30 immediately before complete winding. Accordingly, the direction in which the webbing 12 moves from the mounting of the webbing 12 by the mounting releasing operation to release this mounting state (the vehicle rearward direction) is the downstream side of the displacement direction of the displacement from the pulled-out state to the complete winding state. .

  The opening height (length of the opening 30 in the vehicle width direction) H1 of the opening 30 is longer than the thickness of the webbing 12, so that excessive friction (sliding resistance) does not occur in the webbing 12. However, the opening height H1 is gradually reduced from both ends in the vehicle longitudinal direction toward the center. As shown in FIG. 4 (A), the height of the opening is located at a position on the vehicle rear side of the center of the opening 30 in the longitudinal direction, that is, on the downstream side in the displacement direction of the displacement from the pulled-out state to the fully wound state. A first resistance portion 32 is formed in which the opening 30 is locally bent in a mountain shape toward the inside (or the outside) in the vehicle width direction while maintaining H1 constant. Further, on the vehicle rear side further than the first resistance portion 32, at least one of the inner wall surfaces constituting the opening 30 is curved so as to locally approach toward the other, and the opening height H1 is changed to H2. A second resistance portion 34 that is locally shortened is formed. When the webbing 12 slides in the longitudinal direction, the opening 30 having such a shape (the first resistance portion 32 and the second resistance portion 34) exerts a resistance force against the sliding.

  As shown in FIG. 1, a lever 36 for adjusting the position of the seat cushion 16C is provided on the side of the seat cushion 16C. The lever 36 can be provided at other positions.

  Next, the operation of the first embodiment will be described.

  In the automobile to which the seat belt device 10 having the above configuration is applied, the occupant seated on the seat 16 moves the tongue plate 24 to the buckle 26 side, pulls out the webbing 12 from the retractor 14, and locks the tongue plate 24 to the buckle 26. . As a result, the occupant is restrained by the lap webbing 12A from the through anchor 22 to the tongue plate 24 in the webbing 12 and the upper part of the occupant shoulder webbing 12B from the lap outer anchor 20 to the tongue plate 24 in the webbing 12. Restrained by

  On the other hand, when releasing the occupant restraint state by the webbing 12, the occupant presses the release button of the buckle 26 to open the tongue plate 24. When the occupant releases his hand from the tongue plate 24, the webbing 12 is wound around the retractor 14 by the urging force (winding force) of the winding spring of the retractor 14.

  By the way, when the rotational speed of the winding shaft immediately before the webbing 12 is completely wound around the retractor 14, in other words, when the rotational speed difference between immediately before the stop and the stop time is large, the winding shaft and the webbing The sensor is relatively in the same state as when the webbing 12 is pulled out abruptly. For this reason, the webbing sensor may engage with the lock guide rotating body to enter an end-locked state in which the winding shaft is prevented from rotating in the pull-out direction. In this end-locked state, the webbing 12 cannot be wound on the winding shaft any more, so that it becomes difficult to release the engagement of the lock member with the frame.

  Here, in the seat belt device 10 of the present embodiment, the webbing 12 moves to the vehicle rear side within the opening 30 of the lap outer bezel 28 immediately before the webbing 12 is completely wound around the retractor 14 (shown by a solid line in FIG. 2). The webbing 12 and the webbing 12 shown by a one-dot chain line in FIG. 3), sliding resistance from the opening 30, particularly the first resistance portion 32, that is, resistance force (braking force) against the winding force of the retractor 14. Works. For this reason, the webbing 12 has its winding speed reduced immediately before complete winding, and is wound around the winding shaft of the retractor 14 at this low speed to the complete winding state. This prevents the end lock of the retractor 14 from occurring.

  In some cases, such as the position of the seat 16, the webbing 12 may move further toward the rear of the vehicle within the opening 30 of the lap outer bezel 28. In this case, the second resistor 32 further By applying a large resistance force (braking force), it becomes possible to prevent end locking more reliably.

  And in this seatbelt apparatus 10, immediately before complete winding of the webbing 12 to the retractor 14, the insertion part to the opening 30 of the webbing 12 moves to the vehicle rear side and a braking force is applied. For example, it is possible to prevent a time until the complete winding is increased or a winding failure that prevents the webbing 12 from being completely wound due to friction with the sheet 16 or the like.

  FIG. 5A qualitatively shows a change in the webbing take-up speed (V) with time (t) in the seat belt device 10 of the present embodiment. Further, in FIG. 5B, as a comparative example, in a seat belt apparatus having the same configuration as that of the present embodiment except that the opening through which the webbing is inserted has a certain opening height in the vehicle front-rear direction. The time change of the webbing take-up speed is qualitatively shown. In these graphs, the speed in the winding direction of the webbing 12 to the retractor 14 is positive (positive).

  5A and 5B, in the initial stage of winding, the webbing winding speed is increased, for example, as the winding diameter is gradually increased by the webbing wound on the winding shaft. However, the winding speed does not change abruptly. However, in the comparative example, the winding speed rapidly decreases immediately before the webbing 12 is completely wound on the retractor 14. The webbing sensor in the retractor 14 is activated by such a rapid deceleration of the winding speed. Further, immediately after that, the phenomenon that the winding speed temporarily changes to minus, that is, so-called rebound occurs, so that the webbing 12 is pulled out, and the above-described lock mechanism is operated, and the end lock state is brought about.

  On the other hand, in this embodiment, as can be seen from FIG. 5A, the rapid decrease in the winding speed immediately before the complete winding of the webbing 12 onto the retractor 14 is alleviated, and the winding speed is gradually decreased. . In addition, the absolute value of the winding speed is small with respect to the subsequent rebound. Thus, in this embodiment, it turns out that both the rapid reduction in winding speed immediately before complete winding and subsequent rebound are alleviated, and end lock can be prevented more reliably.

  Moreover, in this embodiment, end locking can be reliably prevented without setting an extra length in the belt as in the prior art. Further, only the first resistance portion 32 and the second resistance portion 34 are provided on the lap outer bezel 28, and a braking force is applied to the webbing 12 without additionally providing or controlling a special mechanism / part. Thus, the end lock can be prevented. For this reason, it is possible to prevent the seat belt device 10, particularly the retractor 14, from being enlarged while having an end lock prevention function, and to be restricted by the base of the center pillar 18 around which the wheel house and ducts are arranged. And the retractor 14 can be mounted.

  FIG. 6A shows a partially enlarged seat belt device according to the second embodiment of the present invention. FIG. 6B shows the seat belt device in a cross section taken along line BB in FIG. 6A. In the second embodiment, the lap outer bezel 52 and the configuration in the vicinity thereof are different from those in the first embodiment, but the other configurations are the same. Hereinafter, description of the whole structure of 2nd Embodiment is abbreviate | omitted, and only a different structure from 1st Embodiment is demonstrated. In the drawings, the same components, members and the like as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted.

  As can be seen from FIG. 6A, the second embodiment includes a guide 54 having an opening 56 through which the webbing 12 is inserted. The guide 54 is formed in a substantially oval shape as a whole, and as shown in FIG. 6B, an engaging groove 58 is formed on the outer periphery of the guide 54 at the center in the vertical direction. On the other hand, the wrap outer bezel 52 of the second embodiment is formed with an accommodation opening 60 in which the guide 54 is accommodated. The inner peripheral edge of the accommodation opening 60 is engaged with the engagement groove 58 of the guide 54 so that the guide 54 does not come out of the lap outer bezel 52 carelessly. Further, the length of the housing opening 60 in the vehicle front-rear direction is longer than the length of the guide 54, and the guide 54 is maintained in the state of being housed in the housing opening 60 (that is, is not carelessly dropped off). It is designed to slide in the longitudinal direction of the vehicle.

  The width (length in the vehicle longitudinal direction) of the opening 56 of the guide 54 is slightly larger than the width of the webbing 12, and does not cause inadvertent resistance to the sliding of the webbing 12, and the front and rear of the webbing 12 in the vehicle. A guide 54 follows the movement in the direction.

  The opening height H3 of the housing opening 60 is an opening height that does not cause resistance to slide of the guide 54 in the vehicle front side region 60F, but resistance is generated to slide of the guide 54 in the vehicle rear side region 60R. The opening height is low.

  Also in the seat belt device of the second embodiment configured as described above, the occupant is restrained in the same manner as the seat belt device 10 of the first embodiment. In this state, the guide 54 is located in the vehicle front side region 60F.

  When the occupant releases his hand from the tongue plate 24 released from the buckle 26 when releasing the restraint, the webbing 12 is wound around the retractor 14 by the urging force (winding force) of the winding spring of the retractor 14.

  Then, immediately before the webbing 12 is completely wound around the retractor 14, the portion of the webbing 12 inserted through the guide 54 tends to move to the vehicle rear side, and therefore the guide 54 that has received this force is moved into the housing opening. An attempt is made to slide the vehicle 60 toward the rear side of the vehicle. Here, in the vehicle rear side region 60 </ b> R of the accommodation opening 60 of the guide 54, the opening height of the accommodation opening 60 is lowered so as to cause resistance to slide of the guide 54. Therefore, the force required to slide the guide 54 toward the rear side of the vehicle acts as a resistance force against the winding of the webbing 12, and the winding speed of the webbing 12 immediately before the complete winding onto the retractor 14 is reduced.

  Therefore, the seat belt device according to the second embodiment can effectively prevent the end lock as with the seat belt device 10. Further, in the seat belt device, like the seat belt device 10, since the braking force is applied immediately before the complete winding of the webbing 12 to the retractor 14, the time until the complete winding is increased, Winding failure is prevented from occurring.

  Furthermore, also in the seat belt device of the second embodiment, it is possible to prevent the end lock by applying a braking force to the webbing 12 without depending on complicated mechanisms and controls. Therefore, the retractor 14 does not increase in size even with this configuration.

  As described above, end locking can be effectively prevented in any of the embodiments of the present invention.

  In the above, in order to apply a braking force to the webbing 12 immediately before complete winding, the opening height of the lap outer bezel 28 through which the webbing 12 is inserted is changed (first embodiment), or Although the structure which changes the opening height of the accommodation opening 60 in which the guide 54 is accommodated was mentioned, the structure which gives a braking force to the webbing 12 is not limited to this. For example, in the first embodiment, the webbing 12 is configured in a portion on the vehicle rear side of the opening 30, that is, a portion with which the webbing 12 comes into contact when the insertion portion of the webbing 12 into the opening 30 moves to the vehicle rear side. Surface processing (surface irregularity processing, processing to increase surface roughness) that increases the sliding resistance (friction coefficient) with the material may be applied, or a material that increases the friction coefficient is applied in advance A configuration may be used. In the configuration in which the opening height is changed, if the opening height is smaller than the thickness of the webbing 12, the braking force can be reliably applied to the webbing 12.

  Further, the braking force that acts on the webbing 12 may act continuously, or may act intermittently. For example, in the configuration of the first embodiment, the first resistance portion 32 and the second resistance portion 34 apply the braking force in two stages. However, the braking force may be one stage, or may be three or more stages. It may be. Furthermore, if the opening height of the opening 30 is gradually reduced toward the vehicle rear side, the continuous braking force can be applied to the webbing 12.

  Further, since the opening 30 and the accommodation opening 60 described above constitute a closed curved surface, they can be configured so that the webbing 12 or the guide 54 does not inadvertently come off from these closed curved surfaces. If the guide 12 or the guide 54 can be guided, it need not be a closed curved surface. That is, the shape may be partially opened. Of course, if it is a closed curved surface, the webbing 12 and the guide 54 are surrounded, so that the webbing 12 can be stably wound and pulled out.

  Furthermore, in order to apply the braking force to the webbing 12 immediately before complete winding, the movement of the webbing 12 in the vehicle front-rear direction is used in the above, but other movements of the webbing 12 may be used. In short, any behavior of the webbing 12 immediately before complete winding may be used as the resistance means of the present invention. For example, it is known in advance that the webbing 12 immediately before complete winding moves in the vehicle width direction. In some cases, this movement may be used. Of course, if the movement of the webbing 12 in the longitudinal direction of the vehicle is used, the movement in the width direction of the webbing 12 is practically used, so the influence of inadvertent bending of the webbing 12 is reduced. The webbing 12 can be stably moved, and as a result, a braking force can be reliably applied, which is preferable.

1 is a perspective view showing a schematic configuration of a seat belt device according to a first embodiment of the present invention. It is a perspective view which shows the vicinity of the lap outer bezel of the seatbelt apparatus of 1st Embodiment of this invention. It is a top view which shows the lap outer bezel of the seatbelt apparatus of 1st Embodiment of this invention. It is a top view which expands and shows the neighborhood of the 1st resistance part of the lap outer bezel concerning a 1st embodiment of the present invention, (A) is the neighborhood of the 1st resistance part, and (B) is the neighborhood of the 2nd resistance part. Respectively. It is a graph which shows the time change of webbing winding speed qualitatively, (A) is a case of this embodiment and (B) is a case of a comparative example. (A) is a perspective view which shows the vicinity of the lap outer bezel of the seatbelt apparatus of 2nd Embodiment of this invention, (B) is BB sectional drawing of (A).

Explanation of symbols

10 seat belt device 12 webbing 12A lap webbing 12B shoulder webbing 14 retractor (winding device)
16 seat 16C seat cushion 18 center pillar 20 lap outer anchor 22 through anchor 22A insertion hole 24 tongue plate 24A insertion hole 26 buckle 26A release button 28 lap outer bezel (guide means)
30 opening (width direction displacement part)
32 1st resistance part (resistance means)
34 2nd resistance part (resistance means)
52 Wrap outer bezel 54 Guide 56 Opening (width direction displacement portion, resistance means)
58 engagement groove 60 accommodation opening 60R vehicle rear side region 60F vehicle front side region

Claims (4)

A winding device that winds up the other end side of the webbing whose one end side is held by the seat or the vehicle body so that it can be pulled out, and urges the webbing in the winding direction;
A guide means that is fixed to a seat or a vehicle body and guides the webbing so that the webbing can be displaced in the webbing width direction between a pulled-out state and a wound-up state;
Resistance means for applying resistance to winding of the webbing by displacement in the webbing width direction from the pulled-out state of the webbing to the winding state with respect to the guide means;
A seat belt device comprising: The guide means has a longitudinal direction in the vehicle front-rear direction and a length in the longitudinal direction that is longer than the width of the webbing so that the webbing is inserted. With an opening located on the vehicle rear side in the take-off state,
2. The seat belt device according to claim 1, wherein the resistance unit is disposed only in a rear side of the vehicle with respect to the longitudinal center in the opening . The said resistance means is comprised by setting large the sliding resistance of the said opening and webbing in the direction which the said webbing displaces from a drawing-out state to a winding state, The structure of Claim 2 characterized by the above-mentioned. Seat belt device. 4. The seat belt device according to claim 2 , wherein the resistance means is a narrow portion that partially narrows an opening width corresponding to a thickness of the webbing of the opening.

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