Abstract:
A tongue for a seat belt device is provided with a tongue main body that is insertable within a buckle, and a train-around portion through which an intermediate portion of a webbing is inserted. The train-around portion includes a first shaft is fixedly mounted between a pair of opposing walls, and a second shaft that is movably mounted between the walls. The webbing is slidably bent 180° around the first fixed shaft. When tension of the webbing exceeds a predetermined magnitude or greater, the movable second shaft engages the webbing and increases a bending angle of the webbing around the first shaft to an angle greater than 180° thereby increasing frictional resistance between the webbing and the train-around portion.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims priority under 35 USC 119 from Japanese Patent Application No. 2011-199899 filed Sep. 13, 2011, the disclosure of which is incorporated by reference herein. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a tongue for a seat belt device that structures a seat belt device of a vehicle, and to a seat belt device that is equipped with this tongue. 
         [0004]    2. Related Art 
         [0005]    At a tongue for a seat belt device that is disclosed in Japanese Patent Application National Publication No. 2009-525909 (Patent Document 1) (this tongue is called the “belt tongue portion” in Patent Document 1), the main body portion thereof (called the “tongue portion main body portion” in Patent Document 1) is curved around an axis whose axial direction is the width direction of a webbing (called “belt webbing” in Patent Document 1), and a curved, plate-shaped bending-and-fastening element is provided at the inner side of this main body portion. 
         [0006]    When, due to the vehicle rapidly decelerating, the body of the vehicle occupant pushes the webbing forward, and, due thereto, the tension of the webbing increases, the bending-and-fastening element slides along the inner side of the main body portion of the tongue due to this tension. The bending-and-fastening element that slides in this way pushes the webbing from a thickness direction one side thereof, and, due thereto, the bending-and-fastening element, together with an upper bar of the main body portion at the tongue, clamps the webbing. Due to the webbing being clamped in this way, the portion of the webbing, which portion is further toward the proximal end side than the tongue, moving further toward the distal end side than the tongue is suppressed. 
         [0007]    However, when tension is applied to the webbing in the state in which the webbing is clamped, localized load is applied to the clamped portion at the webbing. Therefore, the webbing must be endowed in advance with strength that is able to withstand such load. 
       SUMMARY OF THE INVENTION 
       [0008]    In consideration of the above-described circumstances, the present invention is to provide a tongue for a seat belt device and a seat belt device that can prevent or suppress movement of a webbing from a shoulder side to a lap side, and further, at which localized load is not applied to the webbing in this state in which movement is prevented or suppressed. 
         [0009]    A tongue for a seat belt device relating to a first aspect of the present invention has: a tongue main body that is provided at an intermediate portion of a webbing in a longitudinal direction of the webbing, and at which the webbing is folded over in a state in which the tongue main body is inserted in a buckle; a train-around portion that is provided at the tongue main body, and at which the webbing is bent due to the webbing being trained therearound; and a bending angle increasing section that includes a movable portion provided so as to be apart from the train-around portion by more than a thickness dimension of the webbing, and that, in a case in which tension of the webbing is a predetermined magnitude or greater, moves the movable portion in a predetermined direction to cause the movable portion to push the webbing, and trains the webbing around the train-around portion and increases a bending angle of the webbing in a state in which the movable portion is apart from the train-around portion by more than the thickness dimension of the webbing. 
         [0010]    In the tongue for a seat belt device relating to the first aspect of the present invention, for example, when a vehicle occupant who is seated in a seat, while pulling the tongue main body, places the webbing around his/her body and attaches the tongue main body to the buckle, there becomes a state in which the webbing is applied to the body of the vehicle occupant. In this state, the webbing is folded over at the tongue main body. The portion of the webbing, which portion is further toward the longitudinal direction proximal end side than this folded over portion, is the shoulder webbing and restrains the shoulder portion and the chest portion of the vehicle occupant. The portion of the webbing, which portion is further toward the longitudinal direction distal end side than the folded over portion, is the lap webbing and restrains the waist portion of the vehicle occupant. 
         [0011]    On the other hand, for example, due to the vehicle rapidly decelerating, the body of the vehicle occupant attempts to inertially move toward the vehicle front side. When, due thereto, the tension of the webbing becomes greater than or equal to a predetermined magnitude, the movable portion of the bending angle increasing section is moved in a predetermined direction. The movable portion that has moved in this way pushes the webbing, and trains the webbing around the train-around portion that is provided at the tongue main body. Due to the webbing being trained-around the train-around portion in this way, the portion of the webbing, which portion is further toward the distal end side than the train-around portion, bends with respect to the proximal end side of the webbing. Due to the bending angle of the webbing increasing in this way, the frictional resistance between the train-around portion and the webbing increases. The webbing moving further toward the distal end side than the folded over portion of the webbing at the tongue main body, i.e., the length of the lap webbing increasing, can be prevented or suppressed. 
         [0012]    Further, in the tongue for a seat belt device relating to the present invention, from the state before movement of the movable portion to after the end of the movement, the interval between the movable portion and the train-around portion is longer than the thickness dimension of the webbing. Therefore, the webbing is not clamped by the movable portion and the train-around portion. As a result, when movement of the webbing is prevented or suppressed, localized load being applied to the webbing can be prevented even more effectively. 
         [0013]    Note that, in the present invention, it suffices for the train-around portion to be a structure around which the webbing is trained at least due to the webbing being pushed by the movable portion. Accordingly, the webbing does not have to be trained-around the train-around portion in the state before the movable portion moves. Further, even in a structure in which the webbing is trained-around the train-around portion and is bent in the state before the movable portion moves, it suffices for the train-around portion to be a structure in which, due to the movable portion moving, the webbing is further trained-around the train-around portion and the bending angle of the webbing increases. 
         [0014]    Further, in the present invention, there may be a single or plural train-around portions. Moreover, this train-around portion may include the fold-over portion that is the portion at which the webbing is folded over at the tongue main body, and/or may include the movable portion of the bending angle increasing section. 
         [0015]    In a tongue for a seat belt device relating to a second aspect of the present invention, the present invention relating to the first aspect has a restricting portion, the tongue further has a restricting portion that restricts movement of the movable portion in the predetermined direction by the restricting portion engaging with the movable portion that has moved in the predetermined direction with respect to the tongue main body, at a position at which a gap between the train-around portion and the movable portion is greater than or equal to the thickness dimension of the webbing. 
         [0016]    In accordance with the tongue for a seat belt device relating to the second aspect of the present invention, when the tension of the webbing becomes greater than or equal to a predetermined magnitude, and, due thereto, the movable portion of the bending angle increasing section moves in a predetermined direction, the movable portion pushes the webbing. Further, when the movable portion moves in this way, the restricting portion engages with the movable portion. In the state in which the restricting portion is engaged with the movable portion, the interval between the movable portion and the train-around portion is in a state of being greater than or equal to the thickness of the webbing, and moreover, further movement of the movable portion in the predetermined direction is restricted. Accordingly, due to the restricting portion engaging with the movable portion, the interval between the movable portion and the train-around portion after the movable portion moves can be maintained in a state of being greater than or equal to the thickness of the webbing. 
         [0017]    In the first aspect or the second aspect, it is possible that one of the train-around portion or the movable portion is a folded over portion at which the webbing is folded over, and the bending angle increasing section, in the case in which the tension of the webbing is the predetermined magnitude or greater, moves the movable portion in the predetermined direction such that a portion of the webbing at a side further toward a proximal end side than the folded over portion and a portion of the webbing at a side further toward a distal end side than the folded over portion approach or contact with each other in the vicinity of the folded over portion. 
         [0018]    Further, it is possible that the movable portion is a folded over portion at which the webbing is folded over, and the movable portion is a slider member that can slide at the tongue main body. 
         [0019]    Further, it is possible that the train-around portion is a folded over portion at which the webbing is folded over, and the movable portion is a rotating member that can rotate with respect to the tongue main body. 
         [0020]    A seat belt device relating to a third aspect of the present invention has: a buckle that is provided at a side of a seat; a webbing that is shaped as an elongated strip; and a tongue that includes: a tongue main body that is provided at an intermediate portion of the webbing in a longitudinal direction of the webbing, and at which the webbing is folded over, the tongue main body being insertable into the buckle; a train-around portion that is provided at the tongue main body, and at which the webbing is bent due to the webbing being trained therearound; and a bending angle increasing section that includes a movable portion provided so as to be apart from the train-around portion by more than a thickness dimension of the webbing, and that, in a case in which tension of the webbing is a predetermined magnitude or greater, moves the movable portion in a predetermined direction to cause the movable portion to push the webbing, and trains the webbing around the train-around portion and increases a bending angle of the webbing in a state in which the movable portion is apart from the train-around portion by more than the thickness dimension of the webbing. 
         [0021]    In the seat belt device relating to the third aspect of the present invention, for example, when a vehicle occupant who is seated in a seat, while pulling the tongue main body, places the webbing around his/her body and attaches the tongue main body to the buckle, there becomes a state in which the webbing is applied to the body of the vehicle occupant. In this state, the webbing is folded over at the tongue main body. The portion of the webbing, which portion is further toward the longitudinal direction proximal end side than this folded over portion, is the shoulder webbing and restrains the shoulder portion and the chest portion of the vehicle occupant. The portion of the webbing, which portion is further toward the longitudinal direction distal end side than the folded over portion, is the lap webbing and restrains the waist portion of the vehicle occupant. 
         [0022]    On the other hand, for example, due to the vehicle rapidly decelerating, the body of the vehicle occupant attempts to inertially move toward the vehicle front side. When, due thereto, the tension of the webbing becomes greater than or equal to a predetermined magnitude, the bending angle increasing section moves the movable portion in a predetermined direction. The movable portion that has moved in this way pushes the webbing, and trains the webbing around the train-around portion that is provided at the tongue main body. Due to the webbing being trained-around the train-around portion in this way, the portion of the webbing, which portion is further toward the distal end side than the train-around portion, bends with respect to the proximal end side. Due to the bending angle of the webbing increasing in this way, the frictional resistance between the train-around portion and the webbing increases. The webbing moving further toward the distal end side than the folded over portion of the webbing at the tongue main body, i.e., the length of the lap webbing increasing, can be prevented or suppressed. 
         [0023]    Further, in the seat belt device relating to the present invention, from the state before movement of the movable portion to after the end of the movement, the interval between the movable portion and the train-around portion is longer than the thickness dimension of the webbing. Therefore, the webbing is not clamped between the movable portion and the train-around portion. As a result, when movement of the webbing is prevented or suppressed, localized load being applied to the webbing can be prevented even more effectively. 
         [0024]    Note that, in the present invention, it suffices for the train-around portion to be a structure around which the webbing is trained at least due to the webbing being pushed by the movable portion. Accordingly, the webbing does not have to be trained-around the train-around portion in the state before the movable portion moves. Further, even in a structure in which the webbing is trained-around the train-around portion and is bent in the state before the movable portion moves, it suffices for the train-around portion to be a structure in which, due to the movable portion moving, the webbing is further trained-around the train-around portion and the bending angle of the webbing increases. 
         [0025]    Further, in the present invention, there may be a single or plural train-around portions. Moreover, this train-around portion may include the fold-over portion that is the portion at which the webbing is folded over at the tongue main body, and/or may include the movable portion of the bending angle increasing section. 
         [0026]    As described above, in the tongue for a seat belt device and the seat belt device relating to the present invention, movement of the webbing from the shoulder side toward the lap side can be prevented or suppressed, and further, localized load is not applied to the webbing in a state in which such movement is prevented or suppressed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0027]    Embodiments of the invention will be described in detail with reference to the following figures, wherein: 
           [0028]      FIGS. 1A and 1B  are schematic side sectional views, with hatching omitted, of a tongue for a seat belt device relating to a first embodiment that is a basic embodiment, and 
           [0029]      FIG. 1A  shows a state in which a webbing is applied, and  FIG. 1B  shows a state in which a bending angle increasing section is operated; 
           [0030]      FIG. 2  is a schematic plan view of the tongue for a seat belt device relating to the first embodiment that is a basic embodiment; 
           [0031]      FIG. 3  is a drawing showing a summary of the overall structure of a seat belt device to which the tongue for a seat belt device relating to the first embodiment is applied, and a cross-section of the tongue for a seat belt device; 
           [0032]      FIGS. 4A and 4B  are sectional views corresponding to  FIG. 1  and showing a modified example of the first embodiment that is a basic embodiment; 
           [0033]      FIGS. 5A and 5B  are perspective views of a tongue for a seat belt device relating to a second embodiment; 
           [0034]      FIGS. 6A and 6B  are sectional views of the tongue for a seat belt device relating to the second embodiment, and  FIG. 6A  shows a usual state, and  FIG. 6B  shows a state in which a bending angle increasing section operates and increases a bending angle of the webbing; 
           [0035]      FIGS. 7A and 7B  are plan views of a tongue for a seat belt device relating to a third embodiment, and  FIG. 7A  shows a usual state, and  FIG. 7B  shows a state in which a bending angle increasing section increases a bending angle of the webbing; 
           [0036]      FIGS. 8A and 8B  are sectional views of the tongue for a seat belt device relating to the third embodiment, and  FIG. 8A  shows a usual state, and  FIG. 8B  shows a state in which the bending angle increasing section increases the bending angle of the webbing; 
           [0037]      FIG. 9  is a perspective view of overall structure of a tongue for a seat belt device relating to a fourth embodiment, and  FIG. 9A  shows a usual state, and  FIG. 9B  shows a state in which a bending angle increasing section increases a bending angle of the webbing; 
           [0038]      FIGS. 10A and 10B  are sectional views of the tongue for a seat belt device relating to the fourth embodiment, and  FIG. 10A  shows a usual state, and  FIG. 10B  shows a state in which the bending angle increasing section increases the bending angle of the webbing; 
           [0039]      FIG. 11  is a perspective view of a tongue for a seat belt device relating to a fifth embodiment; and 
           [0040]      FIGS. 12A and 12B  are sectional views of the tongue for a seat belt device relating to fifth embodiment, and  FIG. 12A  shows a usual state, and  FIG. 12B  shows a state in which a bending angle increasing section increases a bending angle of the webbing. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0041]    Embodiments of the present invention are described next on the basis of the respective drawings of  FIG. 1A  through  FIG. 12B . Note that, when explaining the following respective embodiments, regions, that are basically the same as those of embodiments and modified examples that were described before the embodiment or modified example that is being explained, are denoted by the same reference numerals, and detailed description thereof is omitted. 
         [0042]    Further, among the following respective embodiments, the first embodiment is a basic embodiment for describing the principles, operation and effects of the present invention in an easily understood manner, and this basic embodiment is described with details of the structure omitted. Description that further concretizes this basic embodiment is given in the respective embodiments from the second embodiment on, and description is given hereinafter with the structures of the respective embodiments from the second embodiment on, and the structures of the first embodiment that is the basic embodiment, being set in correspondence with one another. 
       Structure of First Embodiment (Basic Embodiment)  
       [0043]    The structure of a tongue  10  for a seat belt device (hereinafter called tongue  10 ) relating to a first embodiment (basic embodiment) is shown in  FIGS. 1A and 1B  in a schematic front view (note that hatching of the cross-section is omitted from  FIGS. 1A and 1B  in order to make the structure and operation easy to understand). The structure of the tongue  10  is shown in  FIG. 2  in a schematic side view. Further, the overall structure of a seat belt device  11  that includes the tongue  10  is shown in  FIG. 3  in a schematic front view. 
         [0044]    As shown in these drawings, the tongue  10  has a tongue main body  12 . An insertion portion  14  that is flat-plate-shaped is formed at the tongue main body  12 . As shown in  FIG. 2 , an engagement hole  16  is formed in the insertion portion  14 . When the insertion portion  14  is inserted into a buckle  18  that is shown in  FIG. 3 , a latch provided within the buckle  18  engages with the engagement hole  16  so as to be inserted therein. Due thereto, there becomes a state in which the tongue  10  is attached to the buckle  18 . 
         [0045]    Further, a pair of supporting walls  20 , that oppose one another in the width direction of the insertion portion  14 , are provided at the tongue main body  12 . A first shaft  22 , that is a fold-over portion and serves as a train-around portion, is provided between these supporting walls  20 . In the present embodiment that is a basic embodiment, the first shaft  22  is formed in a solid-cylindrical shape having a round cross-section, and the both ends thereof are fixed to the supporting walls  20 . In the applied state of a webbing  26  to the body of a vehicle occupant  24  that is shown in  FIG. 3 , the webbing  26  is folded over at the first shaft  22  as shown in  FIGS. 1A and 1B . 
         [0046]    As shown in  FIG. 3 , a base (proximal) end side in the longitudinal direction of the webbing  26  is anchored on a spool of a webbing retractor  30  that is provided at the side of a seat  28  opposite the side at which the buckle  18  is provided. The webbing  26 , that is pulled-out toward the upper side of the vehicle from the spool of this webbing retractor  30 , is folded over downwardly at a shoulder anchor  32  that is provided, for example, in a vicinity of an upper end portion of a center pillar of the vehicle. At the webbing  26 , the portion between the shoulder anchor  32  and the first shaft  22  of the tongue  10  is a shoulder webbing  34 , and restrains the shoulder portion and the chest portion of the vehicle occupant  24 . 
         [0047]    In contrast, the portion of the webbing  26 , which portion is further toward the tip (distal) end than the first shaft  22 , is anchored to an anchor plate  36  that is fixed to the vehicle body at the side of the seat  28  opposite the side at which the buckle  18  is provided, or to a skeleton portion of the seat  28 . At the webbing  26 , the portion between the anchor plate  36  and the first shaft  22  of the tongue  10  is a lap webbing  38 , and mainly restrains the waist portion of the vehicle occupant  24  from the front. 
         [0048]    On the other hand, as shown in  FIGS. 1A and 1B , a second shaft  40  that is a movable portion of a bending angle increasing section and that serves as a train-around portion, is provided between the both supporting walls  20  at the side of the first shaft  22  opposite the side at which the insertion portion  14  is provided. In this basic embodiment, the second shaft  40  is formed in a solid-cylindrical shape having a round cross-section. The second shaft  40  is provided at the side of the shoulder webbing  34  opposite the side at which the lap webbing  38  is provided, and further, the second shaft  40  is apart from the shoulder webbing  34  in an initial state. 
         [0049]    This second shaft  40  can move in, for example, the thickness direction of the insertion portion  14 . When the tension of the webbing  26  becomes greater than or equal to a predetermined magnitude, the second shaft  40  approaches the shoulder webbing  34  and pushes the shoulder webbing  34  toward the lap webbing  38  side. Further, as shown in  FIGS. 1A and 1B , the second shaft  40  is provided such that the outer peripheral surface thereof is apart from the outer peripheral surface of the first shaft  22  by greater than or equal to the thickness of the webbing  26 , and, even in the state in which the second shaft  40  is pushing the shoulder webbing  34 , the position of the second shaft  40  is set such that the outer peripheral surface of the second shaft  40  is apart from the outer peripheral surface of the first shaft  22  by greater than or equal to the thickness of the webbing  26 . 
         [0050]    Note that, as described above, the present embodiment is a basic embodiment for easy understanding of the operation and effects thereof. Description of the structure for holding the second shaft  40  in the initial state, and of the concrete structure for operating the second shaft  40 , are omitted here. The structure that concretizes the bending angle increasing section, that corresponds to the second shaft  40 , is described from the second embodiment on. 
       Operation and Effects of First Embodiment (Basic Embodiment)  
       [0051]    Operation and effects of the present embodiment are described next. 
         [0052]    At the present tongue  10 , due to the tip end side of the insertion portion  14  being inserted into the buckle  18  and the latch of the buckle  18  engaging with the engagement hole  16 , there becomes a state in which the tongue  10  is attached to the buckle  18 . If, in this state, the webbing  26  is placed around the body of the vehicle occupant  24 , there is a state in which the webbing  26  is applied to the body of the vehicle occupant  24 , and the body of the vehicle occupant  24  is restrained by the webbing  26 . 
         [0053]    In this state, when the vehicle rapidly decelerates, the body of the vehicle occupant  24  attempts to move inertially toward the vehicle front side. In this case, the waist portion of the vehicle occupant  24  pushes the lap webbing  38  toward the vehicle front side, and the chest portion and the shoulder portion push the shoulder webbing  34  toward the vehicle front side. When the tension of the webbing  26  (the tension of the lap webbing  38  in particular) becomes greater than or equal to a predetermined magnitude due to the body of the vehicle occupant  24  pushing the webbing  26  in this way, the second shaft  40  operates to approach the shoulder webbing  34  along the thickness direction of the insertion portion  14  as shown in  FIG. 1B . 
         [0054]    When the second shaft  40  that approaches the shoulder webbing  34  press-contacts the shoulder webbing  34 , the second shaft  40  pushes the shoulder webbing  34  toward the lap webbing  38  side. Due thereto, as shown in  FIG. 1B , the shoulder webbing  34  is trained around the second shaft  40 , and is trained around the first shaft  22  more so than in the state before the second shaft  40  operates (i.e., the state shown in  FIG. 1A ). Due thereto, the path of passage of the shoulder webbing  34  is changed. 
         [0055]    Due to the shoulder webbing  34  being trained around the second shaft  40  in this way, the portion of the shoulder webbing  34 , which portion is further toward the distal end side than the second shaft  40 , bends around the central axis of the second shaft  40  at an angle of θ 2  (hereinafter called bending angle θ 2 ) with respect to the proximal end side relative to the second shaft  40 . Further, due the webbing  26  being folded over at the first shaft  22 , the portion further toward the distal end side than the first shaft  22  bends at an angle of θ (hereinafter called bending angle θ) with respect to the proximal end side relative to the first shaft  22 . However, due to the shoulder webbing  34  being pushed by the second shaft  40  and the webbing  26  being further trained-around the first shaft  22 , the portion further toward the distal end side than the first shaft  22  bends at an angle of θ 1  (hereinafter called bending angle θ 1 ), that is larger than the bending angle θ, with respect to the proximal end side relative to the first shaft  22 . 
         [0056]    In other words, a portion of the webbing which is further toward the proximal end side than the folded over portion (the first shaft  22 ) (a portion of the shoulder webbing  34 ) and a portion of the webbing which is further toward the distal end side than the folded over portion (a portion of the lap webbing  38 ) approach each other in the vicinity of the folded over portion ( FIG. 1B ). 
         [0057]    Due to the bending angle of the portion of the webbing  26 , which portion is further toward the distal end side than the proximal end side of the first shaft  22 , being increased from θ to θ 1 , the frictional resistance between the first shaft  22  and the webbing  26  increases. Moreover, due to the bending θ 2  increasing due to the shoulder webbing  34  being trained-around the second shaft  40  as described above, the frictional resistance between the second shaft  40  and the webbing  26  further increases. Due thereto, the portion of the webbing  26 , which portion is further toward the distal end side of the webbing  26  than the first shaft  22 , moving, i.e., the shoulder webbing  34  moving further toward the distal end side of the webbing  26  than the first shaft  22 , so the length of the lap webbing  38  increasing, can be prevented or suppressed. By being able to prevent or suppress movement of the webbing  26  further toward the distal end side of the webbing  26  than the first shaft  22 , the lap webbing  38  effectively restrains the waist portion of the vehicle occupant  24 , and inertial movement of the vehicle occupant  24  toward the vehicle front side can be suppressed effectively. 
         [0058]    Moreover, even in the state in which the second shaft  40  pushes the shoulder webbing  34 , the outer peripheral surface of the second shaft  40  is apart from the outer peripheral surface of the first shaft  22  by greater than or equal to the thickness of the webbing  26 . Therefore, the second shaft  40  merely press-contacts the shoulder webbing  34  (the webbing  26 ), and the webbing  26  is not clamped by the second shaft  40  and the first shaft  22 . Thus, in the embodiment, a large load is not applied locally to the webbing  26 , which is different in a structure in which the webbing  26  is clamped so the shoulder webbing  34  side moving toward the distal end side of the webbing  26  is suppressed. 
         [0059]    Note that, in this basic embodiment, the first shaft  22  and the second shaft  40  are shaped as solid cylinders having round cross-sections, for ease of comprehension of the concept of the bending angle. However, the shapes of the sliding-contact portion and the bending angle increasing section are not limited to shapes that are round in cross-section such as those of the first shaft  22  and the second shaft  40 , and these shapes may be non-round shapes such as polygonal or oval or the like. 
         [0060]    Further, in this basic embodiment, the first shaft  22  that is the fold-over portion and the second shaft  40  that is the bending angle increasing section are structured as separate bodies. However, the present invention is not limited to such a structure. 
         [0061]    For example, in a modified example shown in  FIG. 4A , instead of the first shaft  22  and the second shaft  40 , there are provided a first shaft  46  that serves as a train-around portion, and a second shaft  48  that is a fold-over portion, and is a movable portion of a bending angle increasing section, and further, serves as a train-around portion. The axial direction both ends of the first shaft  46  are fixed to the supporting walls  20 , and the shoulder webbing  34  (the webbing  26 ) is trained around the first shaft  46  in the state in which the webbing  26  is applied to the body of the vehicle occupant  24 . In the state in which the webbing  26  is applied to the body of the vehicle occupant  24 , the portion of the shoulder webbing  34 , which portion is further toward the distal end side than the first shaft  46 , bends at an angle of θ 3  (hereinafter called bending angle θ 3 ) with respect to the proximal end side relative to the first shaft  46 . 
         [0062]    On the other hand, in the state in which the webbing  26  is applied to the body of the vehicle occupant  24 , the webbing  26  is trained-around and folded over at the second shaft  48  that is provided further toward the insertion portion  14  side than the first shaft  46 , and the portion of the webbing  26  further toward the proximal end side than the second shaft  48  is the shoulder webbing  34 , and the distal end side is the lap webbing  38 . This second shaft  48  is structured such that, when the tension of the webbing  26  becomes greater than or equal to a given magnitude, as shown in  FIG. 4B , the second shaft  48  moves away from the insertion portion  14  and approaches the first shaft  46 . In the state in which the webbing  26  is applied to the body of the vehicle occupant  24 , the portion of the webbing  26 , which portion is further toward the distal end side than the second shaft  48 , bends at an angle of θ 4  (hereinafter called bending angle θ 4 ) with respect to the proximal end side relative to the second shaft  48 . 
         [0063]    When the tension of the webbing  26  becomes greater than or equal to a given magnitude and the second shaft  48  moves toward the first shaft  46  side, as shown in  FIG. 4B , the portion of the webbing  26 , which portion is further toward the distal end side than the second shaft  48 , bends, with respect to the proximal end side relative to the second shaft  48 , at an angle of θ 5  (hereinafter called bending angle θ 5 ) that is greater than the bending angle θ 4 . Further, due to the second shaft  48  moving toward the first shaft  46  side, the shoulder webbing  34  (the webbing  26 ) is trained further around the first shaft  46 . 
         [0064]    Due thereto, the portion of the shoulder webbing  34 , which portion is further toward the distal end side than the first shaft  46 , bends, with respect to the proximal end side relative to the first shaft  46 , at an angle of θ 6  (hereinafter called bending angle θ 6 ) that is greater than the bending angle θ 3 . In this way, the total sum (bending angle θ 5 +bending angle θ 6 ) of the bending angles of the webbing  26  after the tension of the webbing  26  increases and the second shaft  48  operates increases to more than the total sum (bending angle θ 3 +bending angle θ 4 ) of the bending angles of the webbing  26  before the second shaft  48  operates. In this way, this modified example as well exhibits operation that is similar to and achieves effects that are similar to those of the above-described first embodiment that is the basic embodiment. 
       Structure of Second Embodiment  
       [0065]    A second embodiment is described next. 
         [0066]    The overall structure of a tongue  120  for a seat belt device (hereinafter called tongue  120 ), that is the structure of the main portion of a seat belt device  121  relating to the present embodiment, is shown in  FIGS. 5A and 5B  in side views that correspond to  FIG. 2 . The structure of the tongue  120  is shown in sectional views in  FIGS. 6A and 6B . 
         [0067]    As shown in these drawings, the tongue  120  has a tongue main body  122  that is formed by the punching-out and bending-molding of a metal flat plate. The tongue main body  122  has the insertion portion  14 . A base portion  124  is formed in continuation from the proximal end portion of the insertion portion  14 . The base portion  124  is shaped as a rectangular (trapezoidal) flat plate whose width dimension is sufficient longer than width dimension of the insertion portion  14 . A through-hole  126  is formed in the base portion  124 . 
         [0068]    The opening dimension of the through-hole  126 , along the width direction of the base portion  124  and at the portion of the through-hole  126  that is at the side opposite the insertion portion  14 , is set to be larger than the width dimension of the webbing  26 , and the webbing  26  can pass through the through-hole  126 . The portion of the base portion  124 , which portion is at the side of the through-hole  126  opposite the side at which the insertion portion  14  is provided, is a train-around portion  125 , and the webbing  26  is trained around the train-around portion  125  as described later. Moreover, vertical wall portions  128  are provided so as to stand from the width direction both end portions of the base portion  124  toward one side in the thickness direction of the base portion  124 . Top wall portions  130  extend from the distal (tip) ends of these vertical wall portions  128  (the end portions of the vertical wall portions  128  at the side opposite the base portion  124 ) toward the width direction inner side of the base portion  124 . 
         [0069]    On the other hand, the present tongue  120  has a slider  132  that is a fold-over portion, and is a train-around portion, and also serves as a movable portion that structures a bending angle increasing section. The slider  132  has a slider main body  134 . The slider main body  134  is formed in the shape of a plate that has a thin width and whose longitudinal direction is along the longitudinal direction of the base portion  124 . The longitudinal dimension of the slider main body  134  is set to be shorter than the interval between the one top wall portion  130  and the other top wall portion  130 , and is set to be longer than the opening width dimension of the through-hole  126 . 
         [0070]    Leg plates  136  extend from the longitudinal direction both end portions of the slider main body  134  toward the base portion  124  side along the thickness direction of the slider main body  134 . Pushing pieces  138  extend from the end portions of the leg plates  136  at the side opposite the slider main body  134 , toward the outer sides in the longitudinal direction of the slider main body  134 . The thickness dimension of the pushing pieces  138  is slightly smaller than the interval between the top wall portions  130  and the base portion  124 , and the pushing plates  138  enter-in between the top wall portions  130  and the base portion  124 . 
         [0071]    Due thereto, the slider  132  is guided by the vertical wall portions  128  and the top wall portions  130  and can slide toward the distal end side or the proximal end side of the present tongue  120 . Further, the shape and the like of the leg plates  136  are set such that, in the state in which the pushing pieces  138  have entered in between the top wall portions  130  and the base portion  124 , the interval between the surface of the base portion  124 , including the train-around portion  125 , at the slider  132  side, and the surface of the slider main body  134  at the base portion  124  side, is greater than the thickness of the webbing  26 . 
         [0072]    Further, as shown in  FIGS. 6A and 6B , at the present tongue  120 , the webbing  26  is folded over by being passed-through the through-hole  126  from the side of the base portion  124  opposite the slider  132  and being trained around the slider main body  134 , and the webbing  26  is again passed-through the through-hole  126 . Namely, in the present embodiment, the portion of the webbing  26  further toward the proximal end side than the slider main body  134  is the shoulder webbing  34 , and the portion of the webbing  26  further toward the distal end side than the slider main body  134  is the lap webbing  38 . 
         [0073]    On the other hand, as shown in  FIGS. 5A and 5B , shear pins  140  are formed at one surface in the thickness direction of the base portion  124 . The shear pins  140  are formed on the base portion  124  at the side of the slider  132  that is opposite the side at which the insertion portion  14  is provided, and face the pushing pieces  138  along the sliding direction of the slider  132 . 
       Operation and Effects of Second Embodiment  
       [0074]    Operation and effects of the present embodiment are described next. 
         [0075]    In the state in which the vehicle occupant  24  who is seated in the seat  28  places the webbing  26  around his/her body and attaches the insertion portion of the tongue  120  to the buckle  18 , the slider main body  134  of the slider  132  is pulled by the webbing  26  toward the proximal end side of the tongue  120 , but, as shown in  FIG. 5A  and  FIG. 6A , the pushing pieces  138  are held at positions abutting the shear pins  140 . 
         [0076]    In this state, the webbing  26  contacts one surface in the thickness direction of the slider main body  134  (the surface at the side opposite the base portion  124 ), and the portion of the webbing  26 , which portion contacts the one surface in the thickness direction of the slider main body  134 , is bent at an angle of θ 7  (hereinafter called bending angle θ 7 ) with respect to the portion of the webbing  26  that is further toward the proximal end side than this portion. Further, the portion of the webbing  26 , which portion is further toward the distal end side than the portion that contacts the one surface in the thickness direction of the slider main body  134 , contacts one width direction end of the slider main body  134  (the end portion at the insertion portion  14  side). 
         [0077]    The portion of the webbing  26 , which portion contacts the one width direction end of the slider main body  134 , is bent at an angle of θ 8  (hereinafter called bending angle θ 8 ) with respect to the portion that contacts the one surface in the thickness direction of the slider main body  134 . Further, the portion of the webbing  26 , which portion is further toward the distal end side than the portion that contacts the one width direction end of the slider main body  134 , is bent at an angle of θ 9  (hereinafter called bending angle θ 9 ) with respect to the portion that contacts the one width direction end of the slider main body  134 . 
         [0078]    When, in this state, the vehicle rapidly decelerates and the body of the vehicle occupant  24  pushes the lap webbing  38  of the webbing  26  toward the vehicle front side, the tension of the webbing  26  that increases due thereto pulls the slider main body  134  of the slider  132 . When the slider main body  134  is pulled in this way, the pushing pieces  138  push the shear pins  140  and break the shear pins  140 . Due thereto, the interference of the shear pins  140  with respect to the slider  132  is cancelled, and, as shown in  FIG. 5B  and  FIG. 6B , the slider  132  slides toward the proximal end side of the tongue  120  (i.e., the side opposite the insertion portion  14 ). 
         [0079]    Due to the slider  132  sliding in this way, the other width direction end of the slider main body  134  (the end portion at the side opposite the insertion portion  14 ) is positioned further toward the proximal end side of the tongue  120  (i.e., the side opposite the insertion portion  14 ) than the end portion of the through-hole  126  at the side opposite the insertion portion  14 . Due thereto, as shown in  FIG. 6B , the webbing  26  slidingly-contacts not only the slider main body  134 , but also the portion of the inner peripheral portion of the through hole  126  at the side opposite the insertion portion  14 . Further, the portion of the webbing  26 , which portion is further toward the proximal end side than the portion that slidingly-contacts the inner peripheral portion of the through-hole  126 , slidingly-contacts the surface of the train-around portion  125  at the side opposite the slider  132 . 
         [0080]    In this state, the portion of the webbing  26 , which portion contacts the inner peripheral portion of the through-hole  126 , is bent at an angle of θ 10  (hereinafter called bending angle θ 10 ) with respect to the portion that contacts the train-around portion  125 . Further, the portion of the webbing  26 , which portion is between the train-around portion  125  and the other width direction end of the slider main body  134  (the end portion at the side opposite the insertion portion  14 ), is bent at an angle of θ 11  (hereinafter called bending angle θ 11 ) with respect to the portion of the webbing  26  that contacts the inner peripheral portion of the through-hole  126 . Moreover, the portion of the webbing  26 , which portion contacts the other width direction end of the slider main body  134 , is bent at an angle of θ 12  (hereinafter called bending angle θ 12 ) with respect to the portion of the webbing  26  which portion is between the train-around portion  125  and the other width direction end of the slider main body  134 . 
         [0081]    Moreover, the portion of the webbing  26 , which portion contacts the one surface in the thickness direction of the slider main body  134 , is bent at an angle of θ 13  (hereinafter called bending angle θ 13 ) with respect to the portion that contacts the other width direction end of the slider main body  134 . The portion of the webbing  26 , which portion contacts the one width direction end of the slider main body  134  (the end portion at the insertion portion  14  side), is bent at an angle of θ 14  (hereinafter called bending angle θ 14 ) with respect to the portion that contacts the one surface in the thickness direction of the slider main body  134 . The portion of the webbing  26 , which portion is between the one width direction end of the slider main body  134  and the train-around portion  125 , is bent at an angle of θ 15  (hereinafter called bending angle θ 15 ) with respect to the portion that contacts the one width direction end of the slider main body  134 . The portion of the webbing  26 , which portion is further toward the distal end side than the portion between the one width direction end of the slider main body  134  and the train-around portion  125 , is bent at an angle of θ 16  (hereinafter called bending angle θ 16 ) with respect to that portion that is between the one width direction end of the slider main body  134  and the train-around portion  125 . 
         [0082]    In other words, a portion of the webbing which is further toward the proximal end side than the folded over portion (the slider  132 ) (a portion of the shoulder webbing  34 ) and a portion of the webbing which is further toward the distal end side than the folded over portion (a portion of the lap webbing  38 ) contact with each other in the vicinity of the folded over portion ( FIG. 6B ). 
         [0083]    The total sum (bending angle θ 10 +bending angle θ 11 +bending angle θ 12 +bending angle θ 13 +bending angle θ 14 +bending angle θ 15 +bending angle θ 16 ) of the bending angles from the bending angle θ 10  to the bending angle θ 16  is greater than the total sum (bending angle θ 7 +bending angle θ 8 +bending angle θ 9 ) of the bending angles from the bending angle θ 7  to the bending angle θ 9  which are angles before the slider  132  slides. Due thereto, the frictional resistance between the webbing  26  and the tongue  120  increases. 
         [0084]    Due to the frictional resistance between the webbing  26  and the tongue  120  increasing in this way, movement of the webbing  26  along the longitudinal direction thereof is suppressed. Due thereto, the portion of the webbing  26  at the shoulder webbing  34  side passing-through the through-hole  126  and moving toward the lap webbing  38  side, i.e., the length of the lap webbing  38  increasing, can be prevented or suppressed, and the waist portion of the vehicle occupant  24  can be effectively restrained by the lap webbing  38 , and inertial movement of the vehicle occupant  24  toward the vehicle front side can be effectively suppressed. 
         [0085]    Further, at the tongue  120 , the shape and the like of the leg plates  136  are set such that the interval between the surface of the base portion  124 , including the train-around portion  125 , at the slider  132  side, and the surface of the slider main body  134  at the base portion  124  side, is greater than the thickness of the webbing  26 . Therefore, the base portion  124  (including the train-around portion  125 ) and the slider main body  134  do not clamp the webbing  26 . Thus, as described above, even in a state in which increasing of the length of the lap webbing  38  is prevented or suppressed, a large load is not applied locally to the webbing  26 . 
       Structure of Third Embodiment  
       [0086]    A third embodiment is described next. 
         [0087]    The overall structure of a tongue  160  for a seat belt device (hereinafter called tongue  160 ), that is the structure of the main portion of a seat belt device  161  relating to the present embodiment, is shown in plan views in  FIGS. 7A and 7B . The structure of the tongue  160  is shown in sectional views in  FIGS. 8A and 8B . 
         [0088]    As shown in these drawings, the tongue  160  has top wall portions  162  instead of the top wall portions  130 . Portions of the top wall portions  162 , which portions are at the proximal end side of the tongue main body  122 , are stoppers  164 , and extend further toward the width direction inner side of the tongue main body  122  than the portions of the top wall portions  162 , which portions are further toward the distal end side of the tongue main body  122  than the stoppers  164 . 
         [0089]    On the other hand, the present tongue  160  has, instead of the slider  132 , a slider  166  that is a fold-over portion and is a train-around portion, and further, that serves as a movable portion that structures a bending angle increasing section. Differently than the slider  132 , the slider  166  is formed in the shape of a thin-width plate that does not have the leg plates  136 . The shear pins  140  stand from the base portion  124  at the portion further toward the proximal end side of the tongue  160  than the slider  166  ( FIG. 7A ). Due to the shear pins  140  interfering with the slider  166 , the slider  166  sliding toward the proximal end side of the tongue  160  is restricted. 
         [0090]    Abutment projections  168  are formed from the longitudinal direction both end portions of the slider  166  so as to project toward the proximal end side of the tongue main body  122 . These abutment projections  168  face the stoppers  164  that serve as restricting portion and that are provided further toward the proximal end side of the tongue  160  than the shear pins  140 . Due to the abutment projections  168 , that are a portion of the slider  166  (i.e., a portion of the movable portion) abutting the stoppers  164 , further sliding of the slider  166  toward the proximal end side of the tongue main body  122  is restricted. The projecting dimensions of the abutment projections  168 , the shapes and positions of the stoppers  164 , and the like are set such that, in the state in which the abutment projections  168  abut the stoppers  164 , the interval, along the direction from the proximal end side toward the distal end side of the tongue main body  122 , between the end portion at the slider  166 , which end portion is at the proximal end side of the tongue main body  122 , and the end portion at the through-hole  126 , which end portion is at the proximal end side of the tongue main body  122 , is sufficiently larger than the thickness of the webbing  26 . 
       Operation and Effects of Third Embodiment 
       [0091]    Operation and effects of the present embodiment are described next. 
         [0092]    In the state in which the vehicle occupant  24  who is seated in the seat  28  places the webbing  26  around his/her body and attaches the insertion portion  14  of the tongue  160  to the buckle  18 , the slider  166  is pulled by the webbing  26  toward the proximal end side of the tongue  160 , but, as shown in  FIG. 7A  and  FIG. 8A , the pushing pieces  138  are held at positions abutting the shear pins  140 . 
         [0093]    In this state, the webbing  26  contacts one surface in the thickness direction of the slider  166  (the surface at the side opposite the base portion  124 ), and the portion of the webbing  26 , which portion contacts the one surface in the thickness direction of the slider  166 , is bent at an angle of θ 17  (hereinafter called bending angle θ 17 ) with respect to the portion of the webbing  26  that is further toward the proximal end side than this portion. Further, the portion of the webbing  26 , which portion is further toward the distal end side than the portion that contacts the one surface in the thickness direction of the slider  166 , contacts one width direction end of the slider  166  (the end portion at the insertion portion  14  side). 
         [0094]    The portion of the webbing  26 , which portion contacts the one width direction end of the slider  166 , is bent at an angle of θ 18  (hereinafter called bending angle θ 18 ) with respect to the portion that contacts the one surface in the thickness direction of the slider  166 . Further, the portion of the webbing  26 , which portion is further toward the distal end side than the portion that contacts the one width direction end of the slider  166 , is bent at an angle of θ 19  (hereinafter called bending angle θ 19 ) with respect to the portion that contacts the one width direction end of the slider  166 . 
         [0095]    When, in this state, the vehicle rapidly decelerates and the body of the vehicle occupant  24  pushes the lap webbing  38  of the webbing  26  toward the vehicle front side, the tension of the webbing  26  that increases due thereto pulls the slider  166 . When the slider  166  is pulled in this way, the slider  166  pushes the shear pins  140  and breaks the shear pins  140 . Due thereto, the interference of the shear pins  140  with respect to the slider  166  is cancelled, and, as shown in  FIG. 7B  and  FIG. 8B , the slider  166  slides toward the proximal end side of the tongue  160  (i.e., the side opposite the insertion portion  14 ) until the abutment projections  168  abut the stoppers  164 . 
         [0096]    Due to the slider  166  sliding in this way, the other width direction end of the slider  166  (the end portion at the side opposite the insertion portion  14 ) is positioned further toward the proximal end side of the tongue  160  (i.e., the side opposite the insertion portion  14 ) than the end portion of the through-hole  126  at the side opposite the insertion portion  14 . Due thereto, as shown in  FIG. 8B , the webbing  26  slidingly-contacts not only the slider  166 , but also the portion at the inner peripheral portion of the through hole  126  at the side opposite the insertion portion  14 . Further, the portion of the webbing  26 , which portion is further toward the proximal end side than the portion that slidingly-contacts the inner peripheral portion of the through-hole  126 , slidingly-contacts the surface of the train-around portion  125  at the side opposite the slider  166 . 
         [0097]    In this state, the portion of the webbing  26 , which portion is between the train-around portion  125  and the other width direction end of the slider  166  (the end portion at the side opposite the insertion portion  14 ), is bent at an angle of θ 20  (hereinafter called bending angle θ 20 ) with respect to the portion of the webbing  26  that contacts the surface of the train-around portion  125  at the side opposite the slider  166 . Further, the portion of the webbing  26 , which portion contacts one surface in the thickness direction of the slider  166  (the surface at the side opposite the base portion  124 ), is bent at an angle of θ 21  (hereinafter called bending angle θ 21 ) with respect to the portion of the webbing  26  between the train-around portion  125  and the other width direction end of the slider  166 . 
         [0098]    Moreover, the longitudinal direction of the portion of the webbing  26 , which portion contacts one width direction end of the slider  166  (the end portion at the insertion portion  14  side), is bent at an angle of θ 22  (hereinafter called bending angle θ 22 ) with respect to the portion that contacts the one surface in the thickness direction of the slider  166 . The portion of the webbing  26 , which portion is between the one width direction end of the slider  166  and the train-around portion  125 , is bent at an of θ 23  (hereinafter called bending angle θ 23 ) with respect to the portion of the webbing  26  that contacts the one width direction end of the slider  166 . The portion of the webbing  26 , which portion is further toward the distal end side than the portion between the one width direction end of the slider  166  and the train-around portion  125 , is bent at an angle of θ 24  (hereinafter called bending angle θ 24 ) with respect to the portion between the one width direction end of the slider  166  and the train-around portion  125 . 
         [0099]    The total sum (bending angle θ 20 +bending angle θ 21 +bending angle θ 22  +bending angle θ 23 +bending angle θ 24 ) of the bending angles from the bending angle θ 20  to the bending angle θ 24  is greater than the total sum (bending angle θ 17 +bending angle θ 18 +bending angle θ 19 ) of the bending angles from the bending angle θ 17  to the bending angle θ 19  before the slider  166  slides. Due thereto, the frictional resistance between the webbing  26  and the tongue  160  increases. 
         [0100]    Due to the frictional resistance between the webbing  26  and the tongue  160  increasing in this way, movement of the webbing  26  along the longitudinal direction thereof is suppressed. Due thereto, the portion of the webbing  26  at the shoulder webbing  34  side passing-through the through-hole  126  and moving toward the lap webbing  38  side, i.e., the length of the lap webbing  38  increasing, can be prevented or suppressed, and the waist portion of the vehicle occupant  24  can be effectively restrained by the lap webbing  38 , and inertial movement of the vehicle occupant  24  toward the vehicle front side can be effectively suppressed. 
         [0101]    Further, at the present tongue  160 , even though the abutment projections  168  abut the stoppers  164 , the interval between the end portion of the slider  166  at the proximal end side of the tongue main body  122 , and the end portion of the through-hole  126  at the proximal end side of the tongue main body  122 , is sufficiently larger than the thickness of the webbing  26 , and further, this state is maintained. Therefore, the base portion  124  (including the train-around portion  125 ) and the slider  166  do not clamp the webbing  26 . Thus, as described above, even in a state in which increasing of the length of the lap webbing  38  is prevented or suppressed, a large load is not applied locally to the webbing  26 . 
       Structure of Fourth Embodiment  
       [0102]    A fourth embodiment is described next. 
         [0103]    The overall structure (appearance) of a tongue  190  for a seat belt device (hereinafter called tongue  190 ), that is the structure of the main portion of a seat belt device  191  relating to the present embodiment, is shown in a perspective view in  FIG. 9 . The structure of the tongue  190  is shown in sectional views in  FIGS. 10A and 10B . 
         [0104]    As shown in these drawings, the tongue  190  has a tongue main body  192  that is formed by punching-out a metal flat plate. The tongue main body  192  has the insertion portion  14 . A base portion  194  is formed continuously from the proximal end portion of the insertion portion  14 . The base portion  194  is shaped as a rectangular (trapezoidal) flat plate whose width dimension is sufficiently longer than the width dimension of the insertion portion  14 . A through-hole  196  through which the webbing  26  passes is formed in the base portion  194 . The portion of the base portion  194 , which portion is at the side of the through-hole  196  opposite the side at which the insertion portion  14  is provided, is a fold-over/train-around portion  197  that serves as what are called the train-around portion (the fold-over portion) in the aspects of the invention. Further, shafts  198  are formed from the width direction both end portions of the base portion  194  so as to project-out, coaxially to one another, toward the width direction outer sides of the base portion  194 . 
         [0105]    On the other hand, the present tongue  190  has a rotating member  202  that serves as a movable portion that structures a bending angle increasing section. The rotating member  202  has a pair of arms  204  that face one another in the width direction of the tongue main body  192 . Through-holes, into which the shafts  198  are inserted, are formed in longitudinal direction one ends of these arms  204 . The arms  204  are supported, so as to be rotatable around the shafts  198 , due to the shafts  198  being inserted in the through-holes. In contrast, the longitudinal direction other end portions of the arms  204  are connected integrally by a connecting portion  206 , and the rotating member  202  forms a concave shape that opens toward the distal end side of the tongue main body  192  in plan view. 
         [0106]    A shaft  208  that serves as a train-around portion is provided at the longitudinal direction intermediate portions of the arms  204  at a position that is apart, by greater than or equal to the thickness of the webbing  26 , from the connecting portion  206 . The shaft  208  is formed in, for example, the shape of a round bar having a circular cross-section. One longitudinal direction end portion of the shaft  208  is supported at one of the arms  204 , and the other longitudinal direction end portion is supported at the other arm  204 . Note that, in the present embodiment, the shaft  208  is formed in the shape of a round bar having a circular cross-section, but the shape of the shaft  208  is not limited to a round bar shape, and may be a bar shape having an oval cross-section, or may be an angular bar shape having a polygonal cross-section. 
         [0107]    Further, as shown in  FIG. 10A  and  FIG. 10B , at the present tongue  190 , the portion of the webbing  26 , which portion is further toward the distal end side than the shoulder webbing  34 , passes-through the through-hole  196  from the other side in the thickness direction of the base portion  194 , and passes-through between the connecting portion  206  and the shaft  208  from the one side in the thickness direction of the tongue main body  192 . The portion of the webbing  26 , which portion is further toward the distal end side than the portion that passes-through between the connecting portion  206  and the shaft  208 , is the lap webbing  38 , and the portion of the webbing  26 , which portion is further toward the proximal end side than the pass-through hole  196 , is the shoulder webbing  34 . 
         [0108]    On the other hand, shear pins  210  are formed to project-out at the width direction side end portions of the tongue main body  192 , further toward the distal end side of the tongue main body  122  than the shaft  198 . Pushing portion  212  are formed at the distal end portions of the arms  204  in correspondence with these shear pins  210 . The pushing portions  212  face the shear pins  210  around the shafts  198 . When the rotational force of the rotating member  202 , that is based on the tension of the webbing  26 , becomes greater than or equal to a given magnitude, the pushing portions  212  push and break the shear pins  210 . 
       Operation and Effects of Fourth Embodiment  
       [0109]    Operation and effects of the present embodiment are described next. 
         [0110]    In the state in which the vehicle occupant  24  who is seated in the seat  28  places the webbing  26  around his/her body and attaches the insertion portion  14  of the tongue  190  to the buckle  18 , due to the tension of the lap webbing  38  at the webbing  26 , the lap webbing  38  pushes the shaft  208  and rotates the rotating member  202  until the shear pins  210  interfere with the pushing portions  212 . In this state, as shown in  FIG. 10A , the webbing  26  slidingly-contacts only a portion of the inner peripheral portion of the through-hole  196 , portions of the outer peripheries of the shaft  208  and the base portion  194 . 
         [0111]    In this state, the portion of the webbing  26 , which portion is further toward the distal end side than shaft  208 , is bent at an angle of θ 25  (hereinafter called bending angle θ 25 ) with respect to the longitudinal direction proximal end side. Further, the portion of the webbing  26 , which portion contacts the inner peripheral portion of the through-hole  196 , is bent at an angle of θ 26  (hereinafter called bending angle θ 26 ) with respect to the portion between the shaft  208  and the inner peripheral portion of the through-hole  196 . Moreover, the portion of the webbing  26 , which portion is further toward the distal end side than the portion that contacts the inner peripheral portion of the through-hole  196 , is inclined at an angle of θ 27  (hereinafter called bending angle θ 27 ) with respect to the portion that contacts the inner peripheral portion of the through-hole  196 . 
         [0112]    When, in this state, the vehicle rapidly decelerates and the body of the vehicle occupant  24  pushes the lap webbing  38  of the webbing  26  toward the vehicle front, the tension of the webbing  26  that increases due thereto pushes the shaft  208 , and, due to the rotational force around the shafts  198  that arises due thereto, the arms  204  break the shear pins  210 . When the restriction on the rotation of the rotating member  202  is cancelled due to the shear pins  210  being broken, the rotating member  202  rotates until the longitudinal direction of the arms  204  are along the direction from the proximal end side to the distal end side of the tongue main body  192 . Due thereto, as shown in  FIG. 10B , the webbing  26  slidingly-contacts the other surface in the thickness direction of the base portion  194 . 
         [0113]    In this state, the webbing  26  slidingly-contacts the connecting portion  206  of the rotating member  202 , and the portion of the webbing  26 , which portion is further toward the distal end side than the connecting portion  206 , is bent at an angle of θ 28  (hereinafter called bending angle θ 28 ) with respect to the longitudinal direction proximal end side. Further, the portion of the webbing  26  further toward the distal end side than the shaft  208  is bent at an angle of θ 29  (hereinafter called bending angle θ 29 ) with respect to the portion of the webbing  26  between the connecting portion  206  and the shaft  208 . 
         [0114]    Moreover, the portion of the webbing  26 , which portion slidingly-contacts the inner peripheral portion of the through-hole  196 , is bent at an angle of θ 30  (hereinafter called bending angle θ 30 ) with respect to the portion of the webbing  26  that is between the shaft  208  and the inner peripheral portion of the through-hole  196 . The portion of the webbing  26  up until the lap webbing  38  overlaps the shoulder webbing  34  is bent at an angle of θ 31  (hereinafter called bending angle θ 31 ) with respect to the portion of the webbing  26  that slidingly-contacts the inner peripheral portion of the through-hole  196 . Further, the portion, that is further toward the distal end side than the portion up until the lap webbing  38  overlaps the shoulder webbing  34 , is bent at an angle of θ 32  (hereinafter called bending angle θ 32 ) with respect to the portion up until the lap webbing  38  overlaps the shoulder webbing  34 . 
         [0115]    Due to the frictional resistance between the webbing  26  and the tongue  190  increasing in this way, movement of the webbing  26  along the longitudinal direction thereof is suppressed. Due thereto, the portion of the webbing  26  at the shoulder webbing  34  side passing-through the through-hole  196  and moving toward the lap webbing  38  side can be suppressed, and the waist portion of the vehicle occupant  24  can be effectively restrained by the lap webbing  38 , and inertial movement of the vehicle occupant  24  toward the vehicle front side can be effectively suppressed. 
         [0116]    Moreover, the interval between the connecting portion  206  and the shaft  208  is larger than the thickness dimension of the webbing  26 , and, even if the rotating member  202  rotates, the interval between the connecting portion  206  and the shaft  208  does not change. Therefore, the webbing  26  is not clamped by the connecting portion  206  and the shaft  208 , and accordingly, a large load is not applied locally to the webbing  26 . 
       Structure of Fifth Embodiment 
       [0117]    A fifth embodiment is described next. 
         [0118]    The overall structure of a tongue  240  for a seat belt device (hereinafter called tongue  240 ), that is the structure of the main portion of a seat belt device  241  relating to the present embodiment, is shown in a perspective view in  FIG. 11 . The structure of the tongue  240  is shown in sectional views in  FIGS. 12A and 12B . 
         [0119]    As shown in these drawings, the tongue  240  has a tongue main body  242  that is formed by punching-out and bending-molding a metal flat plate. The insertion portion  14  that is rectangular in plan view is formed at the tongue main body  242 . One of a pair of leg plates  244  is formed continuously from one width direction end side of the insertion portion  14  at one longitudinal direction end of the insertion portion  14 . Another of the pair of leg plates  244  is formed continuously from the other width direction end side of the insertion portion  14  at the one longitudinal direction end of the insertion portion  14 . The interval between the one leg plate  244  and the other leg plate  244  is made to be greater than or equal to the width dimension of the webbing  26 , and the webbing  26  can pass between the both leg plates  244 . Further, at the longitudinal direction intermediate portions thereof, these leg plates  244  are bent in the shapes of cranks around an axis whose axial direction is the width direction. Engaging pieces  246  extend toward the width direction outer sides of the insertion portion  14  from longitudinal direction one ends of the leg plates  244 . 
         [0120]    On the other hand, the tongue  240  has a plate  248  that serves as a bending angle increasing section. The plate  248  has a base portion  250  that serves as a sliding-contact portion and is formed in the shape of a flat plate. The base portion  250  is formed in the shape of a flat plate that is a substantial rectangle whose longitudinal direction runs along the width direction of the insertion portion  14 . A through-hole  252  is formed in the base portion  250 . The through-hole  252  passes-through in the thickness direction of the base portion  250 . The opening shape of the through-hole  252  is a rectangle whose longitudinal direction runs along the longitudinal direction of the base portion  250 . The longitudinal direction dimension of the through-hole  252  is set to be larger than the width dimension of the webbing  26 . In the state in which the tongue main body  242  and the base portion  250  are assembled, the side of the base portion  250 , which side is further toward the insertion portion  14  side than the through-hole  252 , is a first train-around portion  254  that serves as a fold-over portion and a train-around portion, and the side of the base portion  250 , that is at the side of the through-hole  252  opposite the side at which the insertion portion  14  is provided, is a second train-around portion  256  that serves as a movable portion and a train-around portion. 
         [0121]    As shown in  FIGS. 12A and 12B , in the present exemplary embodiment, the webbing  26  is trained around the side of the first train-around portion  254 , which side is opposite the second train-around portion  256 , so as to circle-in from one side in the thickness direction of the base portion  250 , and the webbing  26  passes-through the through-hole  252  between the first train-around portion  254  and the second train-around portion  256 , and extends toward the one side in the thickness direction of the base portion  250 . Namely, in the present embodiment, the portion of the webbing  26 , which portion is further toward the proximal end side than the portion trained-around the first train-around portion  254 , is the shoulder webbing  34 , and the distal end side is the lap webbing  38 . 
         [0122]    On the other hand, as shown in  FIG. 11 , vertical wall portions  258  stand from longitudinal direction both end portions of the base portion  250  toward the one side in the thickness direction of the base portion  250 . Guide holes  260  are formed in these vertical wall portions  258  so as to pass-through in the thickness directions of the vertical wall portions  258 . The opening shapes of the guide holes  260  are triangular or fan-shaped, and the engaging pieces  246  pass-through the guide holes  260  from the longitudinal direction inner side of the base portion  250 . 
         [0123]    The shapes of the guide holes  260  are set such that, in the state in which the engaging pieces  246  are passed-through the guide holes  260 , the plate  248  can rotate, with respect to the tongue main body  242 , around an axis whose axial direction is the longitudinal direction of the base portion  250 . However, shear projections  262  are formed at the inner peripheral portions of the guide holes  260 , and, due to the shear projections  262  interfering with the engaging pieces  246 , rotation of the plate  248  with respect to the tongue main body  242  is restricted, and the engaging pieces  246  are held at positions of being set apart from the base portion  250 . 
         [0124]    When the engaging pieces  246  of the tongue main body  242  break the shear projections  262  due to the tension of the webbing  26 , the plate  248  rotates until restricting portions  264 , that serve as restricting portions and are portions of the inner peripheral portions of the guide holes  260 , abut the engaging pieces  246 . 
       Operation and Effects of Fifth Embodiment 
       [0125]    Operation and effects of the present embodiment are described next. 
         [0126]    In the state in which the vehicle occupant  24  who is seated in the seat  28  places the webbing  26  around his/her body and attaches the insertion portion of the tongue  240  to the buckle  18 , the engaging pieces  246  of the tongue main body  242  interfere with the shear projections  262  as shown in  FIG. 12A , and the engaging pieces  246  are held at positions of being set apart from the base portion  250 . 
         [0127]    In this state, the webbing  26  is trained-around the first train-around portion  254 , and the portion of the webbing  26 , which portion is further toward the distal end side than the portion trained-around the first train-around portion  254 , passes-through the through-hole  252 . In this state, the portion of the webbing  26 , which portion contacts the first train-around portion  254  at the side opposite the second train-around portion  256 , is bent at an angle of θ 33  (hereinafter called bending angle θ 33 ) with respect to the portion of the webbing  26 , which portion is further toward the proximal end side than the portion that contacts the first train-around portion  254  at the side opposite the second train-around portion  256 . 
         [0128]    Further, further toward the distal end side than the portion that contacts the first train-around portion  254  at the side opposite the second train-around portion  256 , the webbing  26  contacts the other surface in the thickness direction of the first train-around portion  254 . The portion of the webbing  26 , which portion contacts the other surface in the thickness direction of the first train-around portion  254 , is bent at an angle of θ 34  (hereinafter called bending angle θ 34 ) with respect to the portion that contacts the first train-around portion  254  at the side opposite the second train-around portion  256 . Further, the portion of the webbing  26 , which portion is further toward the distal end side than the portion that contacts the other surface in the thickness direction of the first train-around portion  254 , is bent at an angle of θ 35  (hereinafter called bending angle θ 35 ) with respect to the portion that contacts the other surface in the thickness direction of the first train-around portion  254 . 
         [0129]    When, in this state, the vehicle rapidly decelerates and the body of the vehicle occupant  24  pushes the lap webbing  38  of the webbing  26  toward the vehicle front, the tension of the webbing  26  that increases due thereto pulls the plate  248 . Due to the plate  248  being pulled in this way, the shearing projections  262  push the engaging pieces  246  and, due thereto, the shearing projections  262  deform or break due to the pushing reaction force that the engaging pieces  246  apply to the shearing projections  262 . The interference of the shearing projections  262  with respect to the engaging pieces  246  is cancelled, and rotation of the plate  248  with respect to the tongue main body  242  is permitted. 
         [0130]    In this state, the plate  248  is pulled by the tension of the webbing  26 , and the plate  248  rotates around an axis, whose axial direction is the width direction of the base portion  250 , with respect to the tongue main body  242  until the restricting portions  264  of the guide holes  260  abut the engaging pieces  246 . When the plate  248  rotates in this way, as shown in  FIG. 12B , the lap webbing  38  is pushed by one surface in the thickness direction of the second train-around portion  256 , and the path of passage of the lap webbing  38 , at the one side in the thickness direction of the second train-around portion  256 , is changed. 
         [0131]    Further, the second train-around portion  256  pushes the shoulder webbing  34  via the lap webbing  38  that is pushed, and, due thereto, the path of passage of the shoulder webbing  34 , at the one side in the thickness direction of the second train-around portion  256 , is changed. The webbing  26 , whose path of passage is changed in this way, is trained-around, of the outer peripheral portion of the first train-around portion  254 , the portions other than the surface that structures the inner peripheral portion of the through-hole  252 , and is trained-around the second train-around portion  256  in a state in which the shoulder webbing  34  and the lap webbing  38  overlap. 
         [0132]    In this state, the portion of the webbing  26 , which portion faces the one surface in the thickness direction of the second train-around portion  256  and the one surface in the thickness direction of the first train-around portion  254 , is bent at an angle of θ 36  (hereinafter called bending angle θ 36 ) with respect to the portion of the webbing  26  that is further toward the proximal end side than the second train-around portion  256 . Further, the portion of the webbing  26 , which portion slidingly-contacts the end surface of the first train-around portion  254  at the side opposite the through-hole  252 , is bent at an angle of θ 37  (hereinafter called bending angle θ 37 ) with respect to the portion of the webbing  26  which portion faces the one surface in the thickness direction of the second train-around portion  256  and the one surface in the thickness direction of the first train-around portion  254 . Moreover, the portion of the webbing  26 , which portion slidingly-contacts the surface at the other side in the thickness direction of the first train-around portion  254 , is bent at an angle of θ 38  (hereinafter called bending angle θ 38 ) with respect to the portion of the webbing  26  which portion slidingly-contacts the end surface of the first train-around portion  254  at the side opposite the through-hole  252 . 
         [0133]    The portion of the webbing  26  that is passed-through the through-hole  252  is bent at an angle of θ 39  (hereinafter called bending angle θ 39 ) with respect to the portion of the webbing  26  which portion slidingly-contacts the surface at the other side in the thickness direction of the first train-around portion  254 . Further, the portion of the webbing  26 , which portion slidingly-contacts the one surface in the thickness direction of the second train-around portion  256 , is bent at an angle of θ 40  (hereinafter called bending angle θ 40 ) with respect to the portion of the webbing  26  that is passed-through the through-hole  252 . Moreover, the portion of the webbing  26 , which is further toward the longitudinal direction distal end side than the portion thereof that slidingly-contacts the one surface in the thickness direction of the second train-around portion  256 , is bent at an angle of θ 41  (hereinafter called bending angle θ 41 ) with respect to this portion of the webbing  26  that slidingly-contacts the one surface in the thickness direction of the second train-around portion  256 . 
         [0134]    The total sum (bending angle θ 36 +bending angle θ 37 +bending angle θ 38 +bending angle θ 39 +bending angle θ 40 +bending angle θ 41 ) of the bending angles from the bending angle θ 36  to the bending angle θ 41  is greater than the total sum (bending angle θ 33 +bending angle θ 34 +bending angle θ 35 ) of the bending angles from the bending angle θ 33  to the bending angle θ 35  before the plate  248  rotates. Due thereto, the frictional resistance between the webbing  26  and the tongue  240  increases. 
         [0135]    Due to the frictional resistance between the webbing  26  and the tongue  240  increasing in this way, movement of the webbing  26  along the longitudinal direction thereof is suppressed. Due thereto, the portion of the webbing  26  at the shoulder webbing  34  side passing-through the through-hole  242  and moving toward the lap webbing  38  side, i.e., the length of the lap webbing  38  increasing, can be prevented or suppressed, and the waist portion of the vehicle occupant  24  can be effectively restrained by the lap webbing  38 , and inertial movement of the vehicle occupant  24  toward the vehicle front side can be effectively suppressed. 
         [0136]    Moreover, because the interval between the first train-around portion  254  and the second train-around portion  256  is greater than the thickness dimension of the webbing  26 , the first train-around portion  254  and the second train-around portion  256  do not clamp the webbing  26 . Further, even when the plate  248  rotates as described above, the plate  248  and the tongue main body  242  do not clamp the webbing  26 , and moreover, in the state in which the restricting portions  264  abut the engaging pieces  246 , further rotation of the plate  248  is restricted. Therefore, as described above, even in a state in which increasing of the length of the lap webbing  38  is prevented or suppressed, a large load is not applied locally to the webbing  26 .