Seatbelt locking tongue and seatbelt device

Abstract

To provide a locking tongue for a seat belt that can be prevented from becoming large. [Solution] According to one embodiment, a locking tongue (2) that can be operated between an unwrapped state and an attached state includes a tongue body (3) having a main wall (31) and a pair of side walls (33, 34), a clamp member (7) that is slidable in a direction toward the main wall (31), a rotating member (5) that is rotatably supported on the side walls (33, 34), and a biasing member that biases the clamp member (7) in a direction away from the main wall (31). Under normal circumstances, a gap larger than the thickness of the webbing (11) is formed between the clamp member (7) and the main wall (31). In the event of a vehicle emergency, the tension in the lap belt (11b) becomes greater than the tension in the shoulder belt (11a), causing the rotating member (5) to rotate in the direction from the shoulder belt (11a) to the lap belt (11b) against the biasing force of the biasing member, and the webbing (11) is clamped between the clamp member (7) and the main wall (31).

Description

[Technical Field]

[0001] The present application relates to a locking tongue for a seat belt and a seat belt device including the locking tongue. [Background technology]

[0002] In a seat belt device installed in a vehicle, a tongue inserted through the webbing (seat belt) is operated between an unwrapped state in which the webbing is extended and an undraped state in which the webbing is folded back onto the shoulder belt and lap belt. In an emergency such as a vehicle collision, as an occupant moves forward due to inertial force, the shoulder belt may be pulled toward the lap belt via the tongue in the undraped state. Therefore, a seat belt locking tongue has been proposed that clamps the webbing in the undraped state in an emergency, thereby preventing the shoulder belt from being pulled toward the lap belt, thereby preventing the occupant's waist from moving forward due to the lap belt side becoming longer and preventing excessive tightening of the occupant due to the shoulder belt side becoming shorter.

[0003] For example, Patent Document 1 discloses a seat belt locking tongue 100 as shown in Figure 12. This locking tongue 100 includes a tongue body 110, a webbing guide 120, and a lock bar 140.

[0004] The tongue body 110 includes a rectangular frame-shaped main wall 111 including a pair of long sides and a pair of short sides, an insertion portion 112 extending from one of the long sides of the main wall 111, and a pair of side walls 113, 114 rising from both short sides of the main wall 111. The webbing guide 120 is rotatably supported by the side walls 113, 114 of the tongue body 110 via a rotation shaft 130. The lock bar 140 is rotatably connected to the webbing guide 120 via a pair of rotation shafts 150.

[0005] Furthermore, the locking tongue 100 includes a bar spring 160 that biases the locking bar 140 to maintain it in the normal position shown in Fig. 13(a). In the worn state, the webbing 200 is wound around the webbing guide 120 so as to be folded back into the shoulder belt 210 and the waist belt 220.

[0006] When the tension in the waist belt 220 increases in the event of a vehicle emergency, the webbing guide 120 rotates in the direction from the shoulder belt 210 to the waist belt 220 as shown in Figure 13(b), causing the lock bar 140 to rotate and move linearly, and the webbing 200 is clamped between the lock bar 140 and the long side of the main wall 111 opposite the insertion portion 112. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-182103 Summary of the Invention [Problem to be solved by the invention]

[0008] However, the locking tongue 100 of Patent Document 1 requires a rotation shaft 130 for the webbing guide 120 and a rotation shaft 150 for the lock bar 140, which results in a problem of increased size.

[0009] Therefore, an object of the present application is to provide a locking tongue for a seat belt that can be prevented from becoming too large. [Means for solving the problem]

[0010] From one aspect, the present application provides a seat belt locking tongue that is operable between an unwrapped state in which a webbing serving as a seat belt is extended and an undone state in which the webbing is folded back into a shoulder belt and a waist belt, and that, in the undone state, allows the webbing to pass through under normal circumstances and clamps the webbing in a vehicle emergency, the tongue comprising: a main wall located on the front side of the webbing in the unwrapped state; a pair of side walls that protrude from both ends of the main wall in the width direction of the webbing to the back side of the webbing; and an insertion portion that extends from the main wall and is inserted into a seat belt buckle; a clamp member that is located on the back side of the webbing in the unwrapped state and engages with guides provided on the pair of side walls so as to be slidable in a direction approaching the main wall; and a rotating member that rotates in a direction from the shoulder belt toward the waist belt to press the clamp member and slide the webbing in a direction toward the main wall, and a biasing member that biases the clamp member in a direction away from the main wall, wherein under normal circumstances, a gap larger than the thickness of the webbing is formed between the clamp member and the main wall, and in the event of an emergency for the vehicle, the tension in the waist belt becomes greater than the tension in the shoulder belt, causing the rotating member to rotate in the direction from the shoulder belt toward the waist belt against the biasing force of the biasing member, and the webbing is clamped between the clamp member and the main wall.

[0011] From another aspect, the present disclosure provides a seat belt device including: the above-mentioned locking tongue for a seat belt; a seat belt buckle that is engaged with the locking tongue and is fixed to a vehicle; a webbing that passes through the locking tongue and has one end side fixed to the vehicle; and a retractor that stores the other end side of the webbing so that it can be pulled out. [Effects of the Invention]

[0012] According to the present application, a locking tongue for a seat belt is provided that can prevent the size from increasing. [Brief explanation of the drawings]

[0013] [Figure 1] 1A and 1B are schematic diagrams of a seat belt device including a seat belt locking tongue according to an embodiment, where FIG. 1A shows the unfastened state and FIG. 1B shows the fastened state. [Figure 2] FIG. [Figure 3] FIG. 2 is an exploded perspective view of the locking tongue. [Figure 4] FIG. 2 is a side view of the locking tongue with the cover removed from the side wall of the tongue body. [Figure 5] FIG. [Figure 6] FIG. 4 is a cross-sectional view of the locking tongue in an unattached state. [Figure 7] FIG. 4 is a cross-sectional view of the locking tongue in a normal attached state. [Figure 8] FIG. 4 is a cross-sectional view of the locking tongue in an installed state in the event of a vehicle emergency. [Figure 9] 8(a) is a cross-sectional view taken along line IXA-IXA in FIG. 7, and FIG. 8(a) is a cross-sectional view taken along line IXB-IXB in FIG. [Figure 10] 10(a) and 10(b) are cross-sectional views of a locking tongue according to a first modified example, where 10(a) shows the locking tongue in a normal mounted state, and 10(b) shows the locking tongue in a mounted state in an emergency. [Figure 11] 10(a) and 10(b) are cross-sectional views of a locking tongue according to a second modified example, where 10(a) shows the locking tongue in a normal state when attached, and 10(b) shows the locking tongue in a state when the vehicle is in an emergency when attached. [Figure 12] FIG. 1 is an exploded perspective view of a conventional seat belt locking tongue. [Figure 13] 13(a) and (b) are cross-sectional views of the locking tongue shown in FIG. 12, where (a) shows the locking tongue in a normal mounted state, and (b) shows the locking tongue in a mounted state in an emergency. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1(a) and (b) show a seat belt device 1 including a seat belt locking tongue 2 according to one embodiment. This seat belt device 1 is mounted on a vehicle 10, and in addition to the locking tongue 2, includes a webbing 11 which is a seat belt, a retractor 12 which is fixed to the vehicle 10, and a seat belt buckle 14.

[0015] 1(a) and 1(b) is for a front seat, and also includes a shoulder anchor 13 fixed to the side wall of a vehicle 10 above a retractor 12. A webbing 11 is slidably looped around the shoulder anchor 13. However, the seat belt device 1 may also be for a rear seat.

[0016] The webbing 11 passes through the locking tongue 2, and one end of the webbing 11 is fixed to the vehicle 10 via a belt anchor 15. The retractor 12 stores the other end of the webbing 11 so that it can be pulled out. The retractor 12 also locks the webbing 11 against being pulled out when the webbing 11 is pulled out suddenly or when the acceleration of the vehicle 10 changes significantly.

[0017] The locking tongue 2 is operated between an unwrapped state in which the webbing 11 is extended as shown in Figures 1(a) and 6, and an unwrapped state in which the webbing 11 is folded back into a shoulder belt 11a and a waist belt 11b as shown in Figures 1(b) and 7. In other words, in the unwrapped state, the webbing 11 is straight from the shoulder anchor 13 to the belt anchor 15 due to the winding force of the retractor 12.

[0018] In the attached state, the locking tongue 2 engages with the buckle 14. In the attached state, the locking tongue 2 allows the webbing 11 to pass through normally, and clamps the webbing 11 in the event of a vehicle emergency.

[0019] Specifically, as shown in Figures 2 and 3, the locking tongue 2 includes a tongue body 3, a rotating member 5 supported by the tongue body 3, and a clamp member 7 operated by the rotating member 5. As shown in Figure 6, the tongue body 3 includes a main wall 31 located on the front side of the webbing 11 in an unfastened state. The front side of the webbing 11 in an unfastened state is the side that can be touched by an occupant seated in a seat 16 targeted by the seat belt device 1, as shown in Figure 1(a) (the side facing toward the interior of the vehicle cabin in Figure 1(a)). Conversely, the side opposite to the side that can be touched by an occupant seated in a seat 16 targeted by the seat belt device 1 (the side facing toward the exterior of the vehicle cabin in Figure 1(a)) is the back side of the webbing 11 in an unfastened state.

[0020] 6, the main wall 31 has one flat surface (a surface facing the same direction as the back side of the webbing 11 in the unfastened state) that comes into surface contact with the webbing 11 in the unfastened state, and another flat surface (a surface facing the same direction as the front side of the webbing 11 in the unfastened state) that faces the opposite side to the one surface. The main wall 31 is in the shape of a substantially rectangular plate whose longitudinal direction is the width direction of the webbing 11 and whose width direction is the extension direction of the webbing 11 in the unfastened state.

[0021] 3, in addition to the main wall 31, the tongue body 3 includes a pair of side walls 33, 34, an insertion portion 32, a rear wall 35, and a canopy 36. The side walls 33, 34 protrude from both ends of the main wall 31 in the width direction of the webbing 11, in other words, from both ends of the main wall 31 in the longitudinal direction, to the back side of the webbing 11.

[0022] The insertion portion 32 is a portion that is inserted into the buckle 14, and extends from the main wall 31 so as to follow the webbing 11 together with the main wall 31 when the webbing 11 is not fastened. The insertion portion 32 is provided with an opening 32a for engagement with the buckle 14. In this embodiment, the insertion portion 32 extends in the width direction of the main wall 31, but the insertion portion 32 may extend in a direction inclined with respect to the width direction of the main wall 31.

[0023] The above-mentioned rotating member 5 is rotatably supported by the side walls 33, 34 via the rotating shaft 6 on the back side of the webbing 11 when the webbing 11 is not attached. That is, each of the side walls 33, 34 is provided with a fitting hole 37 that fits with the end of the rotating shaft 6. Also, each of the side walls 33, 34 is provided with a recess 38 that opens outward along the width direction of the webbing 11. A biasing member 8 is housed in the recess 38, and the opening of the recess 38 is closed by a cover member 9.

[0024] The rear wall 35 extends in the width direction of the webbing 11 so as to bridge the ends of the side walls 33, 34 on the opposite side from the insertion portion 32. As shown in Fig. 6, an insertion opening 35a for the webbing 11 is formed between the rear wall 35 and the main wall 31. The rear wall 35 can be omitted.

[0025] Eaves 36 protrudes from the end of rear wall 35 opposite insertion opening 35a along the contours of side walls 33, 34, and bridges side walls 33, 34 in the same way as rear wall 35. In the direction in which main wall 31 and insertion portion 32 are aligned, the length of eave 36 is about one-third the length of side walls 33, 34. In other words, eave 36 faces main wall 31 across a space facing rear wall 35.

[0026] The clamp member 7 described above is a rod-shaped member that is disposed on the back side of the webbing 11 when not attached, and extends in the width direction of the webbing 11. In this embodiment, the clamp member 7 is located on the opposite side of the insertion portion 32 with respect to the rotation center of the rotating member 5 in the direction along the main wall 31 of the tongue body 3.

[0027] Guides 41 for the clamp member 7 are provided on the side walls 33, 34 of the tongue body 3. The clamp member 7 engages with the guides 41 so as to be slidable in a direction approaching the main wall 31. In this embodiment, the guides 41 are slits extending in the thickness direction of the main wall 31. Therefore, the clamp member 7 slides linearly in the thickness direction of the main wall 31.

[0028] More specifically, one side of the slit, which is the guide 41, forms a wall surface that is continuous with the surface of the rear wall 35 on the side of the insertion portion 32. Also, through the guide 41, the recess 38 and the space between the side walls 33 and 34 communicate with each other.

[0029] Furthermore, in this embodiment, protrusions 71 that protrude toward the main wall 31 of the tongue body 3 are provided on both ends of the clamping member 7. Meanwhile, the main wall 31 has restricting portions 42 that come into contact with the tips of the protrusions 71 of the clamping member 7 when the clamping member 7 slides toward the main wall 31, and restrict the amount of clamping of the webbing 11 by the clamping member 7 (the amount of pressure applied to the webbing 11). However, the side walls 33, 34 may have the restricting portions 42 instead of the main wall 31.

[0030] The tongue body 3 is a molded product in which a metal tongue plate 3A is mostly covered with a resin portion 3B. As shown in Fig. 5, the tongue plate 3A includes a substantially rectangular base portion 30a, a protruding portion 30b protruding in the width direction from the center of the base portion 30a, and bent portions 30c bent from both longitudinal ends of the base portion 30a. The protruding portion 30b forms an insertion portion 32, the base portion 30a forms the core of the main wall 31, and the bent portions 30c form the core of the side walls 33 and 34.

[0031] As shown in Fig. 9(a), a part of the base portion 30a is exposed from the resin portion 3B, and this exposed part constitutes the above-mentioned restricting portion 42. Then, as shown in Fig. 9(b), the protrusions 71 of the metal clamp member 7 can abut against this restricting portion 42. In other words, when the protrusions 71 abut against the restricting portion 42, the webbing 11 is disposed inside the pair of protrusions 71.

[0032] In this embodiment, as shown in Figures 5 and 9(a), a convex portion 30d having a width smaller than the width of the webbing 11 is provided in a position on the base portion 30a corresponding to the center of the clamp member 7. Meanwhile, as described above, one surface of the main wall 31 facing the webbing 11 is flat over its entirety. However, a concave portion or a convex portion may be provided on one surface of the main wall 31 facing the webbing 11. Also, instead of providing the convex portion 30d on the base portion 30a of the tongue plate 3A, the base portion 30a may be flat over its entirety.

[0033] The above-mentioned biasing member 8 biases the clamping member 7 in a direction away from the main wall 31 of the tongue body 3 within the above-mentioned recess 38 of the side wall (33 or 34). In this embodiment, the biasing member 8 is a torsion coil spring, but the biasing member 8 may also be a compression coil spring or an elastic body made of rubber or elastomer.

[0034] 4, the torsion coil spring serving as the biasing member 8 includes a coil portion 81 that is inserted into the end of the rotary shaft 6, a linear first end portion 82 that projects from the coil portion 81, and a generally U-shaped second end portion 83 that projects from the coil portion 81. The first end portion 82 biases the clamping member 7 in a direction away from the main wall 31 outside the projection 71, and the tip of the second end portion 83 is inserted into an engagement hole 39 provided in the side wall (33 or 34).

[0035] The engagement holes 39 are also used to attach the cover members 9. Both cover members 9 also play a role in holding the rotary shaft 6.

[0036] 7, in the worn state, the webbing 11 is wrapped around the above-mentioned rotating member 5 so as to be folded back onto the shoulder belt 11a and the waist belt 11b. The rotating member 5 is a member that extends in the width direction of the webbing 11 with a constant cross section. The rotating member 5 rotates in the direction from the shoulder belt 11a to the waist belt 11b, thereby pressing against the clamp member 7 and sliding it in a direction approaching the main wall 31.

[0037] In this embodiment, the rotating member 5 has a pressing portion 51 interposed between the clamping member 7 and the eaves 36 of the tongue body 3. In other words, under normal circumstances, the pressing portion 51 of the rotating member 5 is urged by the urging member 8 via the clamping member 7 in a direction away from the main wall 31, thereby maintaining the pressing portion 51 pressed against the eaves 36.

[0038] Next, we will explain the operation of the locking tongue 2 in the attached state. Normally, as shown in Figures 7 and 9(a), a gap larger than the thickness of the webbing 11 is formed between the clamp member 7 and the main wall 31 of the tongue body 3.

[0039] On the other hand, in the event of a vehicle emergency, as shown in Fig. 8, the tension in the waist belt 11b becomes greater than the tension in the shoulder belt 11a, causing the turning member 5 to turn in the direction from the shoulder belt 11a to the waist belt 11b against the biasing force of the biasing member 8. As a result, the webbing 11 is clamped between the clamp member 7 and the main wall 31, as shown in Fig. 8 and Fig. 9(b).

[0040] As described above, in the locking tongue 2 of this embodiment, the clamp member 7 engages with the guides 41 provided on the side walls 33, 34 of the tongue body 3, and the rotating member 5 presses the clamp member 7 by rotating, so only one rotation shaft 6 is required for the rotating member 5. Moreover, because the sliding direction of the clamp member 7 is the direction toward the main wall 31, it is easy to shorten the tongue body 3 in the direction of alignment of the main wall 31 and the insertion portion 32. Therefore, it is possible to prevent the locking tongue 2 from becoming large.

[0041] Furthermore, in this embodiment, the main wall 31 of the tongue body 3 has the restricting portion 42 that restricts the clamping amount of the webbing 11 by the clamping member 7, so that damage to the webbing 11 due to excessive clamping can be prevented.

[0042] <Modification> The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0043] For example, the clamp member 7 does not necessarily have to be located on the opposite side of the insertion portion 32 with respect to the rotation center of the rotating member 5 in the direction along the main wall 31 of the tongue body 3. For example, as in a modified locking tongue 2A shown in FIGS. 10(a) and 10(b), the rotating member 5 may be cam-shaped instead of the pressing portion 51, and the clamp member 7 may be located at the same position as the rotation center of the rotating member 5 in the direction along the main wall 31 of the tongue body 3. Alternatively, as in another modified locking tongue 2B shown in FIGS. 11(a) and 11(b), the clamp member 7 may be located on the insertion portion 32 side with respect to the rotation center of the rotating member 5 in the direction along the main wall 31 of the tongue body 3.

[0044] However, if the clamp member 7 is positioned on the opposite side of the insertion portion 32 with respect to the rotation center of the rotating member 5 in the direction along the main wall 31 of the tongue body 3 as in the above embodiment, the thickness of the locking tongue 2 in the thickness direction of the main wall 31 of the tongue body 3 can be reduced.

[0045] Furthermore, in the above embodiment, the sliding direction of the clamping member 7 may be inclined with respect to the thickness direction of the main wall 31 of the tongue body 3. In this case, when the webbing 11 in the clamped state moves, the frictional force between the clamping member 7 and the webbing 11 acts in the direction of release or bite. In contrast, if the sliding direction of the clamping member 7 is in the thickness direction of the main wall 31 of the tongue body 3 as in the above embodiment, it is possible to prevent insufficient clamping force due to the webbing 11 tending to release, and damage to the webbing 11 or obstruction to its return due to the webbing 11 tending to bite.

[0046] Furthermore, the clamp member 7 does not necessarily have to slide linearly. For example, the guide 41 may be arc-shaped, and the clamp member 7 may slide in a curved line. However, if the clamp member 7 slides linearly as in the above embodiment, the clamp member 7 can clamp the webbing 11 with a small stroke. Also, the shapes of the guide 41 and the clamp member 7 can be simplified.

[0047] <Summary> In a first aspect, the present disclosure provides a locking tongue for a seat belt that is operated from one side between an unwrapped state in which a webbing serving as a seat belt is extended and an undone state in which the webbing is folded back into a shoulder belt and a waist belt, and that allows the webbing to pass through in the undone state under normal circumstances and clamps the webbing in a vehicle emergency, the locking tongue including a tongue body that includes a main wall located on the front side of the webbing in the unwrapped state, a pair of side walls that protrude from both ends of the main wall in the width direction of the webbing to the back side of the webbing, and an insertion portion that extends from the main wall and is inserted into a seat belt buckle; a clamp member that is located on the back side of the webbing in the unwrapped state and engages with guides provided on the pair of side walls so as to be slidable in a direction approaching the main wall; and a pivoting member that pivots in a direction from the shoulder belt toward the hip belt to press the clamping member and slide the clamping member in a direction away from the main wall, and the pivoting member is pivotally supported on the pair of side walls on the back side of the webbing, and the webbing is wrapped around the shoulder belt and the hip belt in the worn state, and the pivoting member pivots in a direction away from the main wall, and the clamping member is biased in a direction away from the main wall, and in an emergency of the vehicle, a gap larger than the thickness of the webbing is formed between the clamping member and the main wall when the tension of the hip belt becomes greater than the tension of the shoulder belt, causing the pivoting member to pivot in the direction from the shoulder belt toward the hip belt against the biasing force of the biasing member, and the webbing is clamped between the clamping member and the main wall.

[0048] According to the above configuration, the clamping member engages with a guide provided on the side wall of the tongue body, and the rotating member presses the clamping member by rotating. Therefore, only one rotation axis is required for the rotating member. Moreover, because the clamping member slides toward the main wall, it is easy to shorten the tongue body in the direction of alignment between the main wall and the insertion portion. Therefore, it is possible to prevent the locking tongue from becoming too large.

[0049] As a second aspect, in the first aspect, the clamp member may slide linearly. This configuration allows the clamp member to clamp the webbing with a small stroke. Also, the shapes of the guide and the clamp member can be simplified.

[0050] As a third aspect, in the second aspect, the clamp member may slide in the thickness direction of the main wall. If the sliding direction of the clamp member is inclined with respect to the thickness direction of the main wall of the tongue body, when the clamped webbing moves, frictional force between the clamp member and the webbing acts in the direction of release or wedging. In contrast, if the sliding direction of the clamp member is in the thickness direction of the main wall of the tongue body, it is possible to prevent insufficient clamping force due to webbing easily releasing, and damage to the webbing or obstruction to its return due to webbing easily wedging.

[0051] As a fourth aspect, in any of the first to third aspects, the clamping member may be located on the opposite side of the insertion portion with respect to the rotation center of the rotating member in the direction along the main wall. This configuration allows the thickness of the locking tongue in the thickness direction of the main wall of the tongue body to be reduced.

[0052] As a fifth aspect, in any of the first to fourth aspects, the main wall or the pair of side walls may have a restricting portion that abuts against the clamping member when the clamping member slides toward the main wall to restrict the clamping amount of the webbing by the clamping member. With this configuration, damage to the webbing due to excessive clamping can be prevented.

[0053] In a sixth aspect, the present disclosure provides, from another aspect, a seat belt device including: a locking tongue for a seat belt according to any one of the first to fifth aspects; a seat belt buckle that is fixed to a vehicle and engages with the locking tongue; a webbing that passes through the locking tongue and has one end fixed to the vehicle; and a retractor that stores the other end of the webbing so that it can be pulled out. [Explanation of symbols]

[0054] 1 Seat belt device 10 vehicles 11 Webbing 11a Shoulder belt 11b Waist belt 12 Retractor 14 Buckle 2 Locking Tongue 3 Tongue body 31 Main wall 32 Insertion part 33,34 side wall 41 Guide 42 Regulatory Department 5 Rotating member 7 Clamping member 8. Pressurizing member

Claims

1. A seat belt locking tongue that is operable between an unwrapped state in which a webbing serving as a seat belt is extended and an unwrapped state in which the webbing is folded back into a shoulder belt and a waist belt, and that allows the webbing to pass through under normal circumstances in the unwrapped state and clamps the webbing in a vehicle emergency, a tongue body including a main wall located on the front side of the webbing in the unwrapped state, a pair of side walls protruding from both end portions of the main wall in the width direction of the webbing to the back side of the webbing, and an insertion portion extending from the main wall and inserted into a seat belt buckle; a clamp member that is disposed on the back side of the webbing in the unattached state and that engages with guides provided on the pair of side walls so as to be slidable in a direction approaching the main wall; a rotating member that is rotatably supported by the pair of side walls on the back side of the webbing in the unworn state, and that wraps the webbing around the shoulder belt and the waist belt in a folded manner in the worn state, and that rotates in a direction from the shoulder belt to the waist belt to press the clamp member and slide the clamp member in a direction approaching the main wall; a biasing member that biases the clamping member in a direction away from the main wall, Under normal circumstances, a gap larger than the thickness of the webbing is formed between the clamp member and the main wall, In the event of an emergency involving the vehicle, the tension in the hip belt becomes greater than the tension in the shoulder belt, causing the rotating member to rotate in the direction from the shoulder belt to the hip belt against the biasing force of the biasing member, and the webbing is clamped between the clamping member and the main wall.

2. 2. The seat belt locking tongue according to claim 1, wherein said clamp member slides linearly.

3. 3. The seat belt locking tongue according to claim 2, wherein said clamp member slides in the thickness direction of said main wall.

4. The seat belt locking tongue according to claim 1, wherein the clamp member is located on an opposite side of the insertion portion with respect to a rotation center of the rotating member in a direction along the main wall.

5. 2. The seat belt locking tongue according to claim 1, wherein the main wall or the pair of side walls has a restricting portion that abuts against the clamping member when the clamping member slides in a direction approaching the main wall to restrict an amount of clamping of the webbing by the clamping member.

6. A seat belt locking tongue according to any one of claims 1 to 5; a seat belt buckle that is fixed to a vehicle and that engages with the locking tongue; a webbing that passes through the locking tongue and has one end fixed to the vehicle; a retractor that accommodates the other end of the webbing so that the other end can be pulled out; A seat belt device comprising:

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