JP2019085093A - Tongue - Google Patents

Abstract

To provide a tongue which can facilitate downsizing of a physical constitution.SOLUTION: A tongue 7 has a plate 20 having a longitudinal part 21, which can be inserted into a buckle 8, and a wide part 22, which is formed wider than the longitudinal part 21 at the opposite side of a tip part of the longitudinal part 21, and in which at least a part of the wide part 22 is covered. The wide part 22 has: a base part 23 connected to the longitudinal part 21; a beam part 25 extending in a longitudinal direction of the wide part 22; a connection part 39 connecting the base part 23 to the beam part 25 at both longitudinal ends; and an insertion hole 71 which is formed by the base part 23, the beam part 25, and the connection part 39 and into which a seat belt 4 is inserted. At least one of the beam part 25 and the base part 23 is formed so that a cross section of a longitudinal center part is smaller than that of both end parts when viewed in the longitudinal direction of the wide part 22.SELECTED DRAWING: Figure 5

Description

  The present disclosure relates to a tongue for a seat belt device.

  Conventionally, there is a need to miniaturize tongues for seat belt devices. For example, the overall length of the tongue can be shortened by reducing the insertion hole provided in the tongue for inserting the seat belt.

  By the way, when the seat belt is not worn, the seat belt is disposed on the seat side, for example, extending downward from the upper shoulder anchor. At this time, the tongue hangs on the seat belt. If the insertion hole is small, the inclination angle of the tongue with respect to the seat belt becomes large, and the projection amount of the tongue from the seat belt may increase when it is not mounted, which may be an obstacle.

  For such a problem, for example, Patent Document 1 discloses a configuration in which the inclination angle of the tongue with respect to the seat belt is reduced by bending and inclining the flange portion of the insertion hole.

U.S. Pat. No. 7,761,960

  In the conventional tongue, the strength design for the external force received from the seat belt inserted into the insertion hole can not be optimized, and in some cases, the strength design may be partially excessive. This limits the size and weight reduction of Tong's body size.

  Then, this indication aims at providing the tongue which can promote size reduction of physique.

  A tongue according to one aspect of an embodiment of the present invention has a longitudinal portion which can be inserted into a buckle, and a wide portion which is formed wider than the longitudinal portion on the opposite side to the tip of the longitudinal portion. The wide portion includes a base portion connected to the longitudinal portion, a beam portion extending in the longitudinal direction of the wide portion, the base portion, and the beam portion. A connecting portion connected at both ends in the longitudinal direction, and an insertion hole formed by the base, the beam, and the connecting portion and through which the seat belt is inserted, at least one of the beam and the base is The cross-sectional area when viewed from the longitudinal direction is formed such that both end portions are smaller than the central portion in the longitudinal direction.

  According to the present disclosure, it is possible to provide a tongue capable of promoting miniaturization of the physique.

FIG. 1 is a view showing an example of a seat belt device to which a tongue according to a first embodiment is applied. FIG. 2 is a front plan view of the tongue in FIG. It is a back side top view of the tongue shown in FIG. It is AA sectional drawing of a tongue. It is a front side top view of the plate of tongue. It is a back side top view of the plate of tongue. It is BB, CC, DD, EE sectional drawing of a plate. It is a figure which shows typically the stress and moment which each part of a plate receives, when a tongue receives a tensile load from the seat belt penetrated by the penetration hole. It is a front side top view of a plate of a tongue concerning a 2nd embodiment. It is FF sectional drawing of the plate shown in FIG.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in the drawings are denoted by the same reference numerals as much as possible, and redundant description will be omitted.

First Embodiment
The first embodiment will be described with reference to FIGS. 1 to 8.

  FIG. 1 is a view showing an example of a seat belt device 1 to which a tongue 7 according to a first embodiment is applied. The seat belt device 1 includes a seat belt 4, a retractor 3, a shoulder anchor 6, a tongue 7 and a buckle 8.

  The seat belt 4 is an example of a webbing that restrains an occupant sitting on the seat 2 of the vehicle, and is a belt-like member that can be taken up by the retractor 3 so as to be able to be pulled out. The belt anchor 5 at the end of the seat belt 4 is fixed to the floor or seat 2 of the vehicle body.

  The retractor 3 is an example of a winding device that enables the seat belt 4 to be wound or pulled out, and the seat belt 4 is pulled out of the retractor 3 when a deceleration equal to or greater than a predetermined value at the time of a vehicle collision is applied to the vehicle. Limit that. The retractor 3 is fixed to the seat 2 or the vehicle body in the vicinity of the seat 2.

  The shoulder anchor 6 is an example of a belt insertion tool through which the seat belt 4 is inserted, and is a member for guiding the seat belt 4 pulled out of the retractor 3 toward the shoulder of the occupant.

  The tongue 7 is an example of a belt insertion tool through which the seat belt 4 is inserted, and is a member slidably attached to the seat belt 4 guided by the shoulder anchor 6.

  The buckle 8 is an example of a member to which the tongue 7 is detachably engaged, and is fixed to the floor or seat 2 of the vehicle body.

  When the tongue 7 is engaged with the buckle 8, the portion of the seat belt 4 between the shoulder anchor 6 and the tongue 7 is a shoulder belt portion 9 that restrains the occupant's chest and shoulders. When the tongue 7 is engaged with the buckle 8, the portion of the seat belt 4 between the belt anchor 5 and the tongue 7 is a lap belt portion 10 that restrains the waist of the occupant.

  When the seat belt 4 is not worn by the occupant, the tongue 7 is not engaged with the buckle 8 and the seat belt 4 is fully engaged (specifically, the retractor 3 has no problem with the seat belt 4) The retractable amount is wound on the retractor 3. On the other hand, when the seat belt 4 is attached to the occupant, the seat belt 4 is pulled out of the retractor 3 as shown in FIG. Then, the seat belt 4 is mounted on the occupant by winding the seat belt 4 around the retractor 3 so that the tongue 7 is engaged with the buckle 8 and the slack of the seat belt 4 is reduced.

  In a state in which the tongue 7 is engaged with the buckle 8 and the seat belt 4 is attached to the occupant, the seat belt 4 is normally pulled at a normal pulling speed when a deceleration equal to or greater than a predetermined value is not applied to the vehicle. It can be pulled out freely. Then, when the pulling force in the pulling direction of the seat belt 4 is released, the seat belt 4 takes up an extra pulling amount by the retractor 3.

  When the tongue 7 is engaged with the buckle 8 and the seat belt 4 is attached to the occupant, the seat belt 4 is a retractor 3 as the retractor 3 is in an emergency where deceleration equal to or greater than a predetermined value is applied. By locking or winding the seat belt 4 so as to limit the pulling out of the seat belt 4, the restraint of the seat belt 4 on the occupant is strengthened.

  The configuration of the tongue 7 according to the first embodiment will be described with reference to FIGS. 2 to 4. FIG. 2 is a front plan view of the tongue 7 in FIG. FIG. 3 is a back side plan view of the tongue 7 shown in FIG. FIG. 4 is a cross-sectional view of the tongue 7 taken along the line A-A.

  Note that in FIG. 2 and later, the X direction, the Y direction, and the Z direction are directions perpendicular to each other. The X direction is the extension direction of the longitudinal portion 21 of the plate 20 and the insertion and removal direction of the tongue 7 with respect to the buckle 8. The Y direction is the direction in which the wide portion 22 of the plate 20 extends. The Z direction is a direction in which the pair of main surfaces 72, 73 of the plate 20 oppose each other, and is a direction perpendicular to each of the pair of main surfaces 72, 73.

  As shown in FIGS. 2 to 4, the tongue 7 is provided with an insertion hole 71 through which the seat belt 4 is inserted. The tongue 7 has a plate 20 made of metal. A portion of the plate 20 is covered with a mold portion 70 formed of resin or the like.

  As shown in FIGS. 3 and 4, the seat belt 4 is provided with a tongue stopper 41 so as to protrude from the main surface. On the other hand, the tongue 7 is provided with a stopper receiving portion 77 recessed inward from the surface on the back surface side of the mold portion 70. When the seat belt 4 is not attached to the occupant, the tongue stopper 41 is hooked on the stopper receiving portion 77, and the stopper receiving portion 77 receives the tongue stopper 41. It is possible to regulate movement to the direction side.

  The configuration of the plate 20 of the tongue 7 will be described with reference to FIGS. 5 to 7. FIG. 5 is a front plan view of the plate 20 of the tongue 7. FIG. 6 is a back plan view of the plate 20 of the tongue 7. (A), (B), (C), and (D) of FIG. 7 are BB, CC, DD, and EE cross sections of the plate 20, respectively. As shown in FIGS. 5 to 7, the plate 20 has a longitudinal portion 21 insertable into the buckle 8 and a wide portion 22 formed wider than the longitudinal portion 21, and is formed in a substantially T shape. Flat plate member. When the longitudinal portion 21 is inserted into the buckle 8, the tongue 7 is connected to the buckle 8 through the plate 20.

  The plate 20 is formed by, for example, pressing a single metal plate mainly composed of carbon steel. The plate 20 is a plate-like member having a pair of main surfaces 72 and 73.

  The longitudinal portion 21 is a flat plate portion engageable with the buckle 8 and extends from the wide portion 22 to the tip 24 in the positive X direction. The X direction corresponds to the longitudinal direction of the longitudinal portion 21. The longitudinal portion 21 has an outer edge including a pair of long sides 31 and one short side 32. The pair of long sides 31 is an outer edge extending from the wide portion 22 in the positive X direction. The short side 32 is an outer edge extending in the short direction (Y direction) of the longitudinal portion 21 and is an outer edge of the tip 24 in the X direction. The Y direction corresponds to the width direction of the longitudinal portion 21.

  In the longitudinal portion 21, a latch hole 26 for latching the latch member of the buckle 8 is provided between the distal end portion 24 and the wide portion 22. In the longitudinal portion 21, a reduction hole 27 may be provided between the tip 24 and the wide portion 22 to reduce the weight of the plate 20.

  The wide portion 22 is a plate portion formed on the opposite side of the distal end portion 24 of the longitudinal portion 21 in the X direction. The wide portion 22 has a Y direction as a longitudinal direction. The wide portion 22 has a base 23, a beam 25, and a connection 39.

  The base portion 23 is a flat plate portion connected to the root portion of the longitudinal portion 21 opposite to the distal end portion 24 in the X direction and formed wider than the longitudinal portion 21. The base portion 23 has a Y direction as a longitudinal direction. The base 23 has an end including a first side end 33 and a second side end 34. The first side end 33 is one end in the Y direction. The second side end 34 is the other end opposite to the first side end 33 in the Y direction.

  The beam portion 25 is a flat plate portion extending in the longitudinal direction (that is, the Y direction) of the wide portion 22. The beam portion 25 has a Y direction as a longitudinal direction. Beam 25 has an end that includes a first beam end 35 and a second beam end 36. The first beam end 35 is one end in the Y direction. The second beam end 36 is the other end opposite to the first beam end 35 in the Y direction.

  The connection portion 39 is a flat plate portion connecting the base portion 23 and the beam portion 25 at both ends in the Y direction. The connecting portion 39 has a first arm 29 and a second arm 30. The first arm 29 is a connection that connects the first side end 33 and the first beam end 35, and the second arm 30 has a second side 34 and a second end. Is a connection portion for connecting the beam end portion 36 of FIG.

  In the plate 20, the insertion hole 71 is formed by the base portion 23 of the wide portion 22, the beam portion 25, and the connection portion 39. More specifically, the insertion hole 71 is connected to the X negative direction side end face of the base 23, the X positive direction side end face of the beam 25, and the Y negative direction side end face of the first arm 29 of the connection portion 39. The Y positive direction side end face of the second arm portion 30 of the portion 39 is continuously connected and formed. The insertion hole 71 is formed so that, for example, the Y direction is a major axis and the X direction is a minor axis. Further, the X negative direction side of the insertion hole 71 is formed in parallel to the Y direction. On the other hand, the X positive direction side of the insertion hole 71 is formed such that the central part in the width direction (Y direction) is the widest in the X positive direction side and is inclined toward both ends.

  In the present embodiment, the seat belt 4 has a portion on the side of the shoulder anchor 6 on one main surface 72 side of the plate 20 and a portion on the tip side (belt anchor 5 side) on the other main surface 73 side of the plate 20 Are inserted into the insertion hole 71 so as to be disposed.

  As described above, when the occupant does not wear the seat belt, the seat belt 4 is disposed on the seat side, for example, extending downward from the upper shoulder anchor 6. In the example of FIG. 1, the upper side shoulder anchor 6 and the vertically lower belt anchor 5 are linearly arranged along the vertical direction, and are disposed on the side of the sheet 2 on the left side in the drawing. At this time, the tongue 7 is in an inclined and hanging state with respect to the seat belt 4 between the shoulder anchor 6 and the belt anchor 5. That is, as shown in FIGS. 2 to 4, when the seat belt is not attached, the seat belt 4 on the side of the shoulder anchor 6 disposed on one main surface 72 of the plate 20 extends upward from the insertion hole 71. The seat belt 4 on the side of the belt anchor 5 disposed on the side of the other main surface 73 of 20 is in a state of extending downward from the insertion hole 71.

  Based on the positional relationship between the tongue 7 and the seat belt 4 when the seat belt is not mounted, in the first embodiment, as shown in FIGS. 5 and 7, the insertion hole 71 of the beam 25 is formed. At an end portion on the X positive direction side, a corner portion facing a portion on the side of the shoulder anchor 6 of the seat belt 4 inserted into the insertion hole is face-pressed. That is, the inclined surface 74 is provided on the principal surface 72 side of the end of the beam 25 on the X positive direction side. The inclination direction of the inclined surface 74 is inclined in the negative Z direction with respect to the positive X direction. The inclined surface 74 is formed over the entire width in the Y direction of the end portion of the beam portion 25 forming the insertion hole 71. The length in the X direction of the inclined surface 74 is formed to be constant over the entire width in the Y direction. The end in the X positive direction of the beam 25 is flat along the main surface 73 without protruding in the Z negative direction on the main surface 73 opposite to the main surface 72 on which the inclined surface 74 is provided. .

  As described above, by providing the inclined surface 74 to the beam 25 of the plate 20, the contact position between the beam 25 and the seat belt 4 can be moved in the negative Z direction. As a result, when the seat belt is not attached The inclination angle α of the tongue 7 with respect to the seat belt 4 can be reduced.

  Further, as shown in FIG. 6 and FIG. 7, the insertion hole 71 at the end of the base 23 on the X negative direction side forming the insertion hole 71 when the seat belt 4 is not attached to the occupant. The corner portion facing the tip end side portion of the seat belt 4 to be inserted is face-pressed. That is, the inclined surface 75 is provided on the principal surface 73 side of the end portion on the X negative direction side of the base portion 23 of the plate 20. The inclination direction of the inclined surface 75 is inclined in the positive Z direction with respect to the negative X direction. As shown in FIG. 6, the inclined surface 75 is formed across the entire width in the Y direction of the end portion of the base 23 that forms the insertion hole 71 (however, an inclined surface 76 for the receiving portion described later is formed). The central part of the

  As shown by dotted lines in FIGS. 7B, 7 C, and 7 D, the inclined surface 75 is formed such that the start position on the X positive direction side becomes constant. On the other hand, as described above, the X positive direction side of the insertion hole 71 is inclined from the center to the both ends in the Y direction. For this reason, the length in the X direction of the inclined surface 75 is formed so as to increase from the central portion in the Y direction to both ends. The end portion on the X negative direction side of the base portion 23 does not protrude in the Z positive direction on the main surface 72 opposite to the main surface 73 on which the inclined surface 75 is provided, and is flat along the main surface 72.

  By providing the inclined surface 75 on the base 23 of the plate 20 as described above, the contact position between the base 23 and the seat belt 4 can be moved in the Z positive direction from the first embodiment, and the seat belt is not attached. The inclination angle α of the tongue 7 with respect to the seat belt 4 can be further reduced. The inclination angle α can also be expressed as the inclination angle of the inclined surfaces 74 and 75.

  Further, as shown in FIG. 7, of the beam 25 of the plate 20, the corner of the beam 25 that is face-cut in the extending direction of the longitudinal part 21 and the direction orthogonal to the extending direction of the wide part 22. And the other side (i.e., in the negative direction of Z), with respect to the base 23.

  By thus providing the beam 25 of the plate 20 in an offset manner, the contact position between the beam 25 and the seat belt 4 can be further moved in the Z negative direction, and the seat belt 4 when the seat belt is not attached The inclination angle α of the tongue 7 with respect to can be further reduced.

  And especially in the first embodiment, both the beam portion 25 and the base portion 23 of the plate 20 are formed such that the cross-sectional area when viewed from the longitudinal direction of the wide portion 22 is smaller at both ends than at the center. There is. More specifically, as shown in FIGS. 7A to 7D, in the beam portion 25, the width along the insertion / extraction direction (X direction) of the buckle 8 and the longitudinal portion is closer to both ends than the central portion. Is formed to be smaller. Further, the beam portion 25 is formed such that the length in the X direction of the inclined surface 74 is constant. As shown in FIGS. 7B to 7D, the base 23 is formed such that the length of the inclined surface 75 is larger at both ends than at the center. Further, the base portion 23 is formed to have a constant width in the X direction. That is, in the beam portion 25 and the base portion 23, parameters for changing the cross-sectional area are different in that they are the width in the X direction and the length of the inclined surface, respectively.

  The effect of changing the cross-sectional areas of the beam 25 and the base 23 in this manner will be described with reference to FIG. FIG. 8 is a view schematically showing stresses and moments to which portions of the plate 20 are subjected when the tongue 7 receives a tensile load from the seat belt 4 inserted into the insertion hole 71. As shown in FIG.

As shown in FIG. 8, the vicinity of the central portion of the beam portion 25 is in a multiaxial stress state, and there is a high possibility of breakage or yield. In order to prevent this, it is necessary to increase the cross-sectional area. Further, similarly, since the central portion of the beam 25 receives a large bending moment, there is a high possibility of large warpage and bending deformation, and damage to the seat belt 4 and stress in other portions of the plate 20 may increase. In order to prevent this, it is necessary to increase the second moment of area. The formula for deriving the second moment of area is expressed by “(thickness × (height) ³ ) / 12” and includes the cube of the height (the width in the X direction of the present embodiment), so the second moment of area is greatly increased. To do this, it is effective to increase the width in the X direction. In the beam portion 25, since the X-direction length of the inclined surface 74 is constant, the cross-sectional area can also be increased by increasing the X-direction width. Therefore, it is preferable to increase the cross-sectional area and the cross-sectional secondary moment by enlarging the width in the X direction in the vicinity of the central portion of the beam portion 25 to strengthen the resistance to stress and bending moment.

  On the other hand, as the center portion of the beam portion 25 approaches the both ends, it approaches a uniaxial stress state, and the bending moment decreases. Therefore, the closer the both ends of the beam 25 are, the less the possibility of breakage or bending deformation occurs. Therefore, by reducing the width in the X direction, the cross-sectional area and the second moment of area can be made smaller than the central portion. it can.

  In addition, since the central portion of the base portion 23 is in a multiaxial stress state and receives a large bending moment, the cross-sectional area can be increased by reducing the length in the X direction of the inclined surface 75, and resistance to stress can be obtained. It is preferable to make it strong. On the other hand, as the central portion of the base portion 23 approaches both ends, it approaches a uniaxial stress state, and the bending moment decreases, and the possibility of breakage or bending deformation decreases, so the length of the inclined surface 75 in the X direction By increasing the height, the cross-sectional area can be made smaller than the central portion.

  Thus, by forming the cross-sectional areas of the beam portion 25 and the base portion 23 of the plate 20 so that both end portions are smaller than the central portion, multiaxial stress can be obtained and the resistance of the central portion having a large bending moment can be strengthened. On the other hand, the resistance can be weakened as the central portion becomes closer to the both ends where the resistance is not necessary, and appropriate strength design can be made along the width direction (Y direction) of the plate 20. As a result, it is possible to eliminate the part of excessive strength design as much as possible, and to promote miniaturization of the physical size of the tongue 7.

  In addition, in 1st Embodiment, although only the X direction length of the inclined surface 75 was used as a parameter for changing the cross-sectional area of the base 23, you may use X direction width further. As a result, by increasing the width in the X direction in the vicinity of the central portion of the base portion 23, it is possible to increase the second moment of area and to strengthen the resistance against bending moment.

  Further, in the first embodiment, as shown in FIGS. 3 and 4, the stopper receiving portion 77 is recessed inwardly from the surface of the portion where the base 23 is embedded in the mold portion 70 covering the plate 20. Provided. As shown in FIGS. 6 and 7A, of the end of the base 23 which forms the insertion hole 71, the plate 20 has a corner facing the stopper receiving portion 77 at the central portion overlapping the stopper receiving portion 77. The portion has a receiving inclined surface 76 which is face-faced or chamfered. As shown in FIG. 7A, the end in the negative X direction of the base 23 projects in the positive Z direction on the main surface 72 opposite to the main surface 73 on which the receiving section inclined surface 76 is provided. It is flat along the main surface 72.

  By providing the receiving portion inclined surface 76 at the central portion of the base portion 23 of the plate 20 overlapping the stopper receiving portion 77, the stopper receiving portion 77 can be formed deep from the surface of the molded portion 70 without being disturbed by the plate 20. Thereby, as shown in FIG. 4, the tongue stopper 41 can be inserted deeper into the stopper receiving portion 77, and the inclination angle α of the tongue 7 with respect to the seat belt 4 can be further reduced.

  As shown in FIG. 7, the inclination angle β is preferably larger than the inclination angle α of the inclined surfaces 74 and 75. In addition, as shown in FIGS. 5 and 6, it is preferable that the central portion of the base 23 provided with the receiving part inclined surface 76 be recessed in the direction in which the insertion hole 71 is expanded. With these configurations, a larger space without the plate 20 can be provided at the central portion of the base 23 of the plate 20 overlapping the stopper receiving portion 77. Thereby, the stopper receiving portion 77 can be formed deeper from the surface of the mold portion 70, the insertion amount of the tongue stopper 41 into the stopper receiving portion 77 is further increased, and the inclination angle α of the tongue 7 with respect to the seat belt 4 is further reduced. it can.

  As means for forming the stopper receiving portion 77 deeper, in the first embodiment, the receiving portion inclined surface 76 is provided on the base portion 23 of the plate 20, and the central portion of the base portion 23 is recessed toward the longitudinal portion 21 side. However, it is more preferable to provide the inclined surface 76 for the receiver. Even if the receiving portion inclined surface 76 is provided, the width in the X direction of the central portion does not decrease, so the second moment of area does not decrease, and the resistance against the bending moment can be maintained. Even when the central portion of the base 23 is not recessed toward the longitudinal portion 21, for example, the stopper receiving portion 77 can be molded by making the inclination angle β of the receiving portion inclined surface 76 larger than the inclination angle α. Can be formed deep from the surface of the

  In the first embodiment, the beam portion 25 and the base portion 23 of the plate 20 are both configured such that the cross-sectional area when viewed from the longitudinal direction of the wide portion 22 is smaller at both ends than at the center. However, only one of the beam 25 and the base 23 may be formed such that the cross-sectional area is smaller at both ends than at the center. In this case, it is preferable to apply to the beam portion 25 which is more likely to receive a tensile load from the seat belt 4 inserted into the insertion hole 71.

  In the first embodiment, as a specific method for reducing the cross-sectional area at both ends from the center, in the beam 25, the width along the insertion and removal direction of the buckle 8 and the longitudinal part 21 is greater than the center A first method of reducing both end portions is applied, and in the base portion 23, the length of the inclined surface 75 along the insertion and removal direction of the buckle 8 and the longitudinal portion 21 is larger in the both end portions than in the central portion Although the method of 2 was applied, it is not restricted to this. For example, the second method may be applied to the beam 25, the first method may be applied to the base 23, or the first and second methods may be combined in the beam 25 or the base 23. It may apply. Also, the cross-sectional area may be changed by a method other than the first and second methods.

  In the first embodiment, the inclined surface 74 provided on the beam 25 of the plate 20 of the tongue 7 and the inclined surface 75 provided on the base 23 are formed by surface pressing, but even if formed by chamfering Good. Moreover, although the structure which processed inclined surfaces 74 and 75 in planar shape was illustrated in 1st Embodiment, you may process inclined surfaces 74 and 75 in other surface shapes, such as curved surface shape.

  The first embodiment exemplifies a configuration in which the inclination angles of the inclined surfaces 74 and 75 of the plate 20 are the same as the inclination angle α of the tongue 7 with respect to the seat belt 4, but the inclination angles of the inclined surfaces 74 and 75 are the angles α It may be other than that, or may be different from each other.

Second Embodiment
A second embodiment will be described with reference to FIGS. 9 to 10. FIG. 9 is a front plan view of the plate 120 of the tongue 107 according to the second embodiment. FIG. 10 is an F-F cross-sectional view of the plate 120 shown in FIG.

  As shown in FIG. 10, in the second embodiment, the inclined surface 75 is not provided at the end of the base 23 forming the insertion hole 71, and the inclined surface 74 is provided only at the beam portion 25. It differs from the embodiment. As described above, in the structure in which the base 23 has no inclined surface, the base 23 is also formed with the beam 25 as shown in FIG. 9 in order to form the cross-sectional area of the base 23 smaller at both ends than at the center. Similarly, the width along the insertion / extraction direction of the buckle 8 and the longitudinal portion 21 is formed to be smaller at both ends than at the central portion.

  Thus, even if the inclined surface 74 is provided on the beam 25 of the plate 120 of the tongue 107 and the inclined surface is not provided on the base 23, the cross-sectional areas of the beam 25 and the base 23 of the plate 120 are both ends from the center Can be formed to be smaller, so that the size reduction of the tongue 107 can be promoted similarly to the first embodiment.

  Further, as shown in FIG. 10, in the second embodiment, since the bending process is performed at a substantially middle position of the beam 25 in the x direction, the resistance of the beam 25 to bending moment can be further strengthened.

  Note that, contrary to the second embodiment, the inclined surface 75 may be provided on the base 23 of the plate 120 of the tongue 107, and the inclined surface may not be provided on the beam portion 25.

  The present embodiment has been described above with reference to the specific example. However, the present disclosure is not limited to these specific examples. Those appropriately modified in design by those skilled in the art are also included in the scope of the present disclosure as long as the features of the present disclosure are included. The elements included in the above-described specific examples, and the arrangement, conditions, and shapes thereof are not limited to those illustrated, but can be appropriately modified. The elements included in the above-described specific examples can be appropriately changed in combination as long as no technical contradiction arises.

Reference Signs List 1 seat belt device 4 seat belt 6 shoulder anchor 7, 107 tongue 8 buckle 20, 120 plate 21 longitudinal portion 22 wide portion 23 base portion 25 beam portion 39 connection portion 41 tongue portion 70 molded portion 71 insertion hole 74, 75 inclined surface 76 receiving Sloped surface for parts 77 Stopper receiving part

Claims (8)

A plate having a longitudinal portion which can be inserted into a buckle and a wide portion which is formed wider than the longitudinal portion on the opposite side to the tip of the longitudinal portion, and at least a part of the wide portion is covered Equipped
The wide part is a base connected to the longitudinal part, a beam extending in the longitudinal direction of the wide part, a connecting part connecting the base and the beam at both ends in the longitudinal direction, and the base An insertion hole formed by the beam portion and the connection portion for inserting a seat belt;
At least one of the beam portion and the base portion is formed such that a cross-sectional area when viewed in the longitudinal direction is smaller at both ends than at a central portion in the longitudinal direction.
Tong. The beam portion or the base portion formed so that the cross-sectional area is smaller at the both end portions than the central portion,
The width along the insertion / extraction direction of the buckle and the longitudinal portion is formed such that the both end portions are smaller than the central portion.
A tong according to claim 1. The beam portion or the base portion formed so that the cross-sectional area is smaller at the both end portions than the central portion has an end portion forming the insertion hole,
The end portion has an inclined surface that faces the seat belt when the seat belt that is inserted into the insertion hole is not worn by a passenger.
The inclined surface is formed by face pressing or chamfering,
The length of the inclined surface along the insertion / extraction direction of the buckle and the longitudinal portion is formed such that the both end portions are larger than the central portion.
A tongue according to claim 1 or 2. Both the beam and the base are formed such that the cross-sectional area is smaller at the ends than at the center,
The beam portion and the base portion have an end portion forming the insertion hole,
The end portion has an inclined surface that faces the seat belt when the seat belt that is inserted into the insertion hole is not worn by a passenger.
The inclined surface is formed by face pressing or chamfering,
The beam portion is formed such that the width along the insertion and removal direction of the buckle and the longitudinal portion is smaller at the both end portions than at the central portion.
The base portion is formed such that the length of the inclined surface along the insertion and removal direction of the buckle and the longitudinal portion is larger at the both end portions than at the central portion.
The tongue according to any one of claims 1 to 3. Both the beam and the base are formed such that the cross-sectional area is smaller at the ends than at the center,
The beam portion and the base portion have an end portion forming the insertion hole,
The end portion of the beam portion is provided with an inclined surface facing the seat belt when the seat belt inserted into the insertion hole is not worn by a passenger.
The inclined surface is formed by face pressing or chamfering,
The end of the base is not provided with the inclined surface,
The beam portion and the base portion are formed such that the width along the insertion and removal direction of the buckle and the longitudinal portion is smaller at the both end portions than at the central portion.
A tongue according to claim 1 or 2. A stopper receiving portion configured to receive a tongue stopper projecting from the main surface of the seat belt and restrict movement of the tongue relative to the seat belt when the seat belt is not mounted on the occupant; Equipped
The stopper receiving portion is provided so as to be recessed inward from a surface of a portion in which the base portion is embedded in a mold portion covering the plate,
The plate has a receiving portion inclined surface facing the stopper receiving portion at a central portion overlapping with the stopper receiving portion of an end portion forming the insertion hole in the base portion.
The inclined surface for the receiving portion is formed by face pressing or chamfering.
The tongue according to any one of claims 1 to 5. At least one of the beam portion and the base portion faces the seat belt in an unmounted state where the seat belt inserted into the insertion hole is not attached to a passenger at an end portion forming the insertion hole. Have an inclined surface,
The inclination angle of the receiving part inclined surface is larger than the inclination angle of the inclined surface.
A tong according to claim 6. The base portion is formed such that the central portion provided with the receiving portion inclined surface is recessed in a direction in which the insertion hole is expanded.
A tongue according to claim 6 or 7.

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