JP7166098B2 - tongs - Google Patents

Description

The present disclosure relates to tongues for seat belt devices.

Conventionally, there is a need for miniaturization of tongues for seat belt devices. For example, the overall length of the tongue can be shortened by reducing the size of the insertion hole provided in the tongue and through which the seat belt is inserted.

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

In order to address such a problem, for example, Patent Document 1 discloses a configuration that reduces the inclination angle of the tongue with respect to the seat belt by bending and inclining the edge portion of the insertion hole.

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

In conventional tongues, the strength design against the external force received from the seat belt inserted through the insertion hole cannot be said to be optimized, and there are cases where the strength design is partially excessive. This imposes restrictions on the miniaturization and weight reduction of the tongs.

Accordingly, an object of the present disclosure is to provide tongs that can promote downsizing of the physique.

A tongue according to one aspect of the embodiment of the present invention has a longitudinal portion that can be inserted into a buckle, and a wide portion formed wider than the longitudinal portion on the opposite side to the tip of the longitudinal portion, A plate covering at least a portion of the wide portion is provided, and the wide portion includes a base portion connected to the longitudinal portion, a beam portion extending in the longitudinal direction of the wide portion, and the base portion and the beam portion. It has a connection portion connected at both ends in the longitudinal direction, and an insertion hole formed by the base portion, the beam portion, and the connection portion and through which a seat belt is inserted, and at least one of the beam portion and the base portion The cross-sectional area when viewed from the longitudinal direction is formed so that both end portions are smaller than the central portion in the longitudinal direction, and the cross-sectional area is formed so that the both end portions are smaller than the central portion. The beam portion or the base portion has an end portion forming the insertion hole. It has an inclined surface facing the seat belt, the inclined surface is formed by chamfering or chamfering, and the length of the inclined surface along the insertion/extraction direction of the buckle and the longitudinal portion is greater than the central portion. Both ends are formed larger .
Similarly, a tongue according to another aspect of the embodiment of the present invention includes a longitudinal portion that can be inserted into the buckle, and a wide portion that is wider than the longitudinal portion and formed on the opposite side of the distal end of the longitudinal portion. and at least a portion of the wide portion is coated with a plate, the wide portion including a base connected to the longitudinal portion, a beam extending in the longitudinal direction of the wide portion, the base and the connecting portions for connecting the beam portion to the beam portion at both ends in the longitudinal direction; and an insertion hole formed by the base portion, the beam portion, and the connecting portion and through which a seat belt is inserted. At least one is formed so that the cross-sectional area when viewed in the longitudinal direction is smaller at both end portions than at the central portion in the longitudinal direction, and both the beam portion and the base portion have the cross-sectional area at the central portion. The beam portion and the base portion each have an end portion forming the insertion hole, and the end portion is formed so that the seat belt inserted through the insertion hole is inserted into the seat belt. It has an inclined surface facing the seat belt when it is not worn by an occupant, the inclined surface is formed by chamfering or chamfering, and the beam portion is formed between the buckle and the longitudinal portion. The width along the insertion/extraction direction of the buckle is formed so that the both end portions are smaller than the central portion, and the length of the inclined surface along the insertion/extraction direction of the buckle and the longitudinal portion of the base portion is the length of the central portion. The both end portions are formed to be larger than the portion.
Similarly, a tongue according to another aspect of the embodiment of the present invention includes a longitudinal portion that can be inserted into the buckle, and a wide portion that is wider than the longitudinal portion and formed on the opposite side of the distal end of the longitudinal portion. and at least a portion of the wide portion is coated with a plate, the wide portion including a base connected to the longitudinal portion, a beam extending in the longitudinal direction of the wide portion, the base and the connecting portions for connecting the beam portion to the beam portion at both ends in the longitudinal direction; and an insertion hole formed by the base portion, the beam portion, and the connecting portion and through which a seat belt is inserted. At least one is formed so that the cross-sectional area when viewed in the longitudinal direction is smaller at both end portions than at the central portion in the longitudinal direction, and both the beam portion and the base portion have the cross-sectional area at the central portion. The beam portion and the base portion each have an end portion forming the insertion hole, and the end portion of the beam portion is inserted through the insertion hole. An inclined surface facing the seat belt is provided when the seat belt is not worn by the occupant, and the inclined surface is formed by chamfering or chamfering, and is attached to the end portion of the base portion. is not provided with the inclined surface, and the beam portion and the base portion are formed such that the width along the insertion/extraction direction between the buckle and the longitudinal portion is smaller at the both end portions than at the central portion.

Advantageous Effects of Invention According to the present disclosure, it is possible to provide tongs that can promote downsizing.

FIG. 1 is a diagram showing an example of a seat belt device to which the tongue according to the first embodiment is applied. 2 is a front plan view of the tongue in FIG. 1. FIG. FIG. 3 is a rear plan view of the tongs shown in FIG. 2; It is an AA cross-sectional view of the tongue. Fig. 3 is a front side plan view of the plate of the tongue; FIG. 4 is a rear plan view of the plate of the tongs; It is a BB, CC, DD, and EE cross-sectional view of the plate. FIG. 4 is a diagram schematically showing the stress and moment received by each part of the plate when the tongue receives a tensile load from a seat belt inserted through an insertion hole; FIG. 11 is a front side plan view of a plate of tongs according to a second embodiment; FIG. 10 is a cross-sectional view of the plate shown in FIG. 9 taken along line FF;

Embodiments will be described below with reference to the accompanying drawings. In order to facilitate understanding of the description, the same constituent elements in each drawing are denoted by the same reference numerals as much as possible, and overlapping descriptions are omitted.

[First embodiment]
A first embodiment will be described with reference to FIGS. 1 to 8. FIG.

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

The seat belt 4 is an example of webbing that restrains an occupant sitting on the seat 2 of the vehicle, and is a belt-like member that is retractably wound around the retractor 3 . A belt anchor 5 at the tip of the seat belt 4 is fixed to the floor of the vehicle body or the seat 2 .

The retractor 3 is an example of a retractor capable of retracting or retracting the seat belt 4, and the seat belt 4 is retracted from the retractor 3 when deceleration equal to or greater than a predetermined value is applied to the vehicle at the time of a vehicle collision or the like. limit The retractor 3 is fixed to the seat 2 or the vehicle body near the seat 2 .

The shoulder anchor 6 is an example of a belt passer through which the seat belt 4 is passed, and is a member that guides the seat belt 4 pulled out from the retractor 3 toward the shoulder of the occupant.

The tongue 7 is an example of a belt passer through which the seat belt 4 is passed, 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 with which the tongue 7 is detachably engaged, and is fixed to the floor or seat 2 of the vehicle body.

With the tongue 7 engaged with the buckle 8, the portion of the seat belt 4 between the shoulder anchor 6 and the tongue 7 is the shoulder belt portion 9 that restrains the chest and shoulders of the occupant. With the tongue 7 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 retracted (specifically, the retractor 3 pulls the seat belt 4 without any trouble). A retractable amount) is taken up by the retractor 3. On the other hand, when the seat belt 4 is worn by the occupant, the seat belt 4 is pulled out from the retractor 3 as shown in FIG. The seat belt 4 is worn by the occupant by engaging the tongue 7 with the buckle 8 and winding the seat belt 4 around the retractor 3 so that the slack in the seat belt 4 is reduced.

In a state where the tongue 7 is engaged with the buckle 8 and the seat belt 4 is worn by the occupant, the seat belt 4 is pulled out at a normal speed when the vehicle is not decelerated beyond a predetermined value, such as when a vehicle crashes. It can be pulled out freely. Then, when the pulling force of the seat belt 4 in the withdrawing direction is released, the excess amount of the seat belt 4 withdrawn is wound up by the retractor 3 .

In the state where the tongue 7 is engaged with the buckle 8 and the seat belt 4 is worn by the occupant, in the event of an emergency such as a vehicle collision in which the vehicle is decelerated more than a predetermined value, the retractor 3 is retracted. The restraint of the seat belt 4 on the occupant is enhanced by locking or retracting the seat belt 4 so as to limit its withdrawal from the seat belt.

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

In FIG. 2 and subsequent figures, the X direction, Y direction, and Z direction are directions perpendicular to each other. The X direction is the direction in which the longitudinal portion 21 of the plate 20 extends and the direction in which the tongue 7 is inserted into and removed from the buckle 8 . The Y direction is the extending direction of the wide portion 22 of the plate 20 . The Z direction is the direction in which the pair of main surfaces 72 and 73 of the plate 20 face each other and is the direction perpendicular to each of the pair of main surfaces 72 and 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 tongs 7 have a metal plate 20 . A portion of the plate 20 is covered with a molded portion 70 made of resin or the like.

As shown in FIGS. 3 and 4, the seat belt 4 is provided with a tongue stopper 41 protruding from the main surface. On the other hand, the tongue 7 is provided with a stopper receiving portion 77 that is recessed inward from the rear surface of the mold portion 70 . When the seat belt 4 is not worn by the occupant, the tongue stopper 41 is caught by the stopper receiving portion 77, and the tongue stopper 41 is received by the stopper receiving portion 77, thereby X-correcting the tongue 7 with respect to the seat belt 4. Movement in the direction can be restricted.

The configuration of the plate 20 of the tongue 7 will be described with reference to FIGS. 5 to 7. FIG. FIG. 5 is a front plan view of the plate 20 of the tongue 7. FIG. FIG. 6 is a rear plan view of the plate 20 of the tongue 7. FIG. 7A, 7B, 7C, and 7D are cross-sectional views of the plate 20 taken along BB, CC, DD, and EE, respectively. As shown in FIGS. 5 to 7, the plate 20 has a longitudinal portion 21 that can be inserted into the buckle 8 and a wide portion 22 that is wider than the longitudinal portion 21, and is formed in a substantially T shape. It is a planar plate member. By inserting the longitudinal portion 21 into the buckle 8 , the tongue 7 is connected with the buckle 8 via the plate 20 .

The plate 20 is formed, for example, by press working from a sheet of metal plate whose main component is carbon steel. The plate 20 is a plate-shaped member having a pair of main surfaces 72 and 73 .

The longitudinal portion 21 is a planar plate portion that can be engaged with the buckle 8 and extends from the wide portion 22 to the tip portion 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 . A pair of long sides 31 are outer edges extending from the wide portion 22 in the positive X direction. The short side 32 is an outer edge extending in the lateral direction (Y direction) of the longitudinal portion 21 and is an outer edge of the distal end portion 24 in the X direction. The Y direction corresponds to the width direction of the longitudinal portion 21 .

A latch hole 26 for latching with the latch member of the buckle 8 is provided in the longitudinal portion 21 between the distal end portion 24 and the wide portion 22 . The longitudinal portion 21 may be provided with lightening holes 27 between the tip portion 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 longitudinal portion 21 from the distal end portion 24 in the X direction. The wide portion 22 has the Y direction as its longitudinal direction. The wide portion 22 has a base portion 23 , a beam portion 25 and a connection portion 39 .

The base portion 23 is a planar plate portion that is connected to the root portion of the longitudinal portion 21 on the side opposite to the distal end portion 24 in the X direction and is wider than the longitudinal portion 21 . The longitudinal direction of the base 23 is the Y direction. The base 23 has edges including a first side edge 33 and a second side edge 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 planar plate portion extending in the longitudinal direction (that is, Y direction) of the wide portion 22 . The beam portion 25 has the Y direction as its longitudinal direction. Beam 25 has ends including first beam end 35 and 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 planar plate portion that connects the base portion 23 and the beam portion 25 at both ends in the Y direction. The connecting portion 39 has a first arm portion 29 and a second arm portion 30 . The first arm portion 29 is a connection portion that connects the first side end portion 33 and the first beam end portion 35 , and the second arm portion 30 is a connection portion that connects the second side end portion 34 and the second beam end portion 35 . It is a connecting portion that connects the beam end portion 36 of the .

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 negative X direction end surface of the base portion 23 , the positive X direction end surface of the beam portion 25 , the negative Y end surface of the first arm portion 29 of the connecting portion 39 , and the negative Y direction end surface of the first arm portion 29 of the connecting portion 39 . The Y positive direction side end surface of the second arm portion 30 of the portion 39 is continuously connected. The insertion hole 71 is formed, for example, so that the Y direction is the major axis and the X direction is the minor axis. Also, the X negative direction side of the insertion hole 71 is formed parallel to the Y direction. On the other hand, the positive X direction side of the insertion hole 71 is widest in the positive X direction at the central portion in the width direction (Y direction), 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 . is inserted through the insertion hole 71 so that the .

As described above, when the occupant is not wearing a seat belt, the seat belt 4 is arranged on the side of the seat while extending downward from the upper shoulder anchor 6, for example. In the example of FIG. 1 , it forms a straight line along the vertical direction between the upper shoulder anchor 6 and the vertically lower belt anchor 5 and is arranged on the left side of the sheet 2 . At this time, the tongue 7 is in a state in which it hangs down 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 seatbelt is not worn, the seatbelt 4 on the side of the shoulder anchor 6 arranged on one main surface 72 of the plate 20 extends upward from the insertion hole 71 to extend upward from the plate. The seat belt 4 on the side of the belt anchor 5 arranged on the other main surface 73 side of the seat belt 20 extends downward from the insertion hole 71 .

Assuming such a positional relationship between the tongue 7 and the seat belt 4 when the seat belt is not worn, in the first embodiment, as shown in FIGS. At the end on the X positive direction side, the corner facing the shoulder anchor 6 side portion of the seat belt 4 inserted through the insertion hole is chamfered. That is, an inclined surface 74 is provided on the main surface 72 side of the end portion of the beam portion 25 on the positive X 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 of the inclined surface 74 in the X direction is uniform over the entire width in the Y direction. The end portion of the beam portion 25 on the positive X direction side does not protrude in the negative Z direction from the main surface 73 on the side opposite to the main surface 72 on which the inclined surface 74 is provided, and is flat along the main surface 73 . .

Thus, by providing the inclined surface 74 on the beam portion 25 of the plate 20, the contact position between the beam portion 25 and the seat belt 4 can be moved in the negative Z direction. of the tongue 7 with respect to the seat belt 4 can be reduced.

As shown in FIGS. 6 and 7, when the seat belt 4 is not worn by the occupant at the end of the base portion 23 on the negative X direction side where the insertion hole 71 is formed, the insertion hole 71 is closed. The corner facing the tip side portion of the seat belt 4 to be passed through is chamfered. That is, an inclined surface 75 is provided on the main surface 73 side of the end portion of the base portion 23 of the plate 20 on the negative X direction side. 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 over the entire width in the Y direction of the end portion of the base portion 23 forming the insertion hole 71 (however, a receiving portion inclined surface 76 described later is formed). except for the central part where

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

By providing the inclined surface 75 in the base portion 23 of the plate 20 in this manner, the contact position between the base portion 23 and the seat belt 4 can be moved in the Z positive direction side compared to the first embodiment, and the seat belt is not worn. 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 angles of the inclined surfaces 74 and 75 .

Further, as shown in FIG. 7, the beams 25 of the plate 20 are chamfered at the corners of the beams 25 in the direction perpendicular to the extending direction of the longitudinal portion 21 and the extending direction of the wide portion 22. is offset with respect to the base 23 on the opposite side (that is, the Z negative direction).

By offsetting the beam portion 25 of the plate 20 in this manner, the contact position between the beam portion 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 worn can be moved further. of the tongue 7 with respect to can be further reduced.

In particular, in the first embodiment, both the beam portion 25 and the base portion 23 of the plate 20 are formed so that the cross-sectional area when viewed from the longitudinal direction of the wide portion 22 is smaller at both end portions than at the central portion. there is More specifically, as shown in FIGS. 7(A) to 7(D), the width of the beam 25 along the insertion/extraction direction (X direction) between the buckle 8 and the longitudinal portion is greater at both ends than at the center. is formed to be small. Further, the beam portion 25 is formed so that the X-direction length of the inclined surface 74 is constant. As shown in FIGS. 7(B) to 7(D), the base 23 is formed such that the length of the inclined surface 75 is longer at both ends than at the center. Also, the base portion 23 is formed to have a constant width in the X direction. That is, the beam portion 25 and the base portion 23 are different in that the parameters for changing the cross-sectional area are the X-direction width and the slope length, respectively.

The effect of changing the cross-sectional areas of the beam portion 25 and the base portion 23 in this manner will be described with reference to FIG. FIG. 8 is a diagram schematically showing the stress and moment received by each part of the plate 20 when the tongue 7 receives a tensile load from the seat belt 4 inserted through 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 fracture or yield. To prevent this, it is necessary to increase the cross-sectional area. Also, since the central portion of the beam portion 25 also receives a large bending moment, there is a high possibility that large warpage or bending deformation will occur, and there is a risk that the seat belt 4 will be damaged and the stress on other portions of the plate 20 will increase. To prevent this, it is necessary to increase the area moment of inertia. The formula for deriving the geometrical moment of inertia is expressed as "(thickness x (height) ³ )/12", and since it includes the cube of the height (the width in the X direction of this embodiment), the geometrical moment of inertia can be increased. To do so, 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 be increased by increasing the X-direction width. Therefore, in the vicinity of the central portion of the beam portion 25, it is preferable to increase the cross-sectional area and the geometrical moment of inertia by increasing the width in the X direction, thereby enhancing the resistance to stress and bending moment.

On the other hand, as the beam portion 25 approaches from the central portion to both ends, it approaches a uniaxial stress state and the bending moment decreases. Therefore, the closer to both end portions of the beam portion 25, the less likely it is to be broken or bent. Therefore, by reducing the width in the X direction, the cross-sectional area and the moment of inertia can be made smaller than those in the central portion. can.

In addition, since the vicinity of the central portion of the base portion 23 is in a state of multiaxial stress and receives a large bending moment, by reducing the length of the inclined surface 75 in the X direction, the cross-sectional area is increased and resistance to stress is increased. Stronger is preferred. On the other hand, as the base portion 23 approaches both ends from the central portion, the uniaxial stress state is approached and the bending moment becomes smaller, so that the possibility of fracture or bending deformation is reduced. By increasing the width, the cross-sectional area can be made smaller than in the central portion.

Thus, by forming the cross-sectional areas of the beam portions 25 and the base portion 23 of the plate 20 so that the both end portions are smaller than the central portion, the resistance of the central portion, which is in a multiaxial stress state and has a large bending moment, can be enhanced. On the other hand, resistance can be weakened toward both ends where resistance is not required toward the central portion, and appropriate strength can be designed along the width direction (Y direction) of the plate 20 . As a result, it is possible to eliminate the excessively strong design portion as much as possible, and the size reduction of the tongs 7 can be promoted.

In the first embodiment, only the X-direction length of the inclined surface 75 is used as a parameter for changing the cross-sectional area of the base 23, but the X-direction width may also be used. As a result, by increasing the width in the X direction near the central portion of the base 23, the moment of inertia of area can be increased, and the resistance to bending moment can be increased.

In the first embodiment, as shown in FIGS. 3 and 4, the stopper receiving portion 77 is recessed inward from the surface of the portion of the mold portion 70 covering the plate 20 in which the base portion 23 is embedded. be provided. As shown in FIGS. 6 and 7A, the plate 20 has corners facing the stopper receiving portion 77 at the central portion overlapping the stopper receiving portion 77 among the end portions forming the insertion hole 71 of the base portion 23 . The portion has a receiving portion inclined surface 76 which is chamfered or chamfered. As shown in FIG. 7A, the end portion of the base portion 23 on the negative X direction side does not protrude in the positive Z direction on the main surface 72 opposite to the main surface 73 on which the receiving portion inclined surface 76 is provided. First, it is flat along the main surface 72 .

By providing the receiving inclined surface 76 in 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 mold portion 70 without being obstructed by the plate 20 . As a result, 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 made smaller.

As shown in FIG. 7, the inclination angle β is preferably greater than the inclination angle α of the inclined surfaces 74,75. Moreover, as shown in FIGS. 5 and 6, it is preferable that the central portion of the base portion 23 provided with the receiving portion inclined surface 76 is recessed in the direction in which the insertion hole 71 is widened. With these configurations, a larger space without the plate 20 can be provided in the central portion of the base portion 23 of the plate 20 overlapping the stopper receiving portion 77 . As a result, the stopper receiving portion 77 can be formed deeper from the surface of the mold portion 70, the amount of insertion 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. can.

In addition, as means for forming the stopper receiving portion 77 deeper, in the first embodiment, the base portion 23 of the plate 20 is provided with the receiving portion inclined surface 76, and the central portion of the base portion 23 is recessed toward the longitudinal portion 21 side. It is more preferable to provide the receiving portion inclined surface 76 . This is because even if the receiving portion inclined surface 76 is provided, the X-direction width of the center portion does not decrease, so the geometrical moment of inertia does not decrease, and the resistance to the bending moment can be maintained. Even if the central portion of the base portion 23 is not recessed toward the longitudinal portion 21 , for example, the stopper receiving portion 77 may be positioned closer to the mold portion 70 by increasing the inclination angle β of the receiving portion inclined surface 76 with respect to the inclination angle α. can be formed deep from the surface of

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

In addition, in the first embodiment, as a specific method for making the cross-sectional area smaller at both ends than at the central portion, the beam portion 25 has a width along the insertion/extraction direction between the buckle 8 and the longitudinal portion 21 that is greater than that at the central portion. A first method is applied in which both ends are made smaller, and in the base portion 23, the length of the inclined surface 75 along the insertion/extraction direction between the buckle 8 and the longitudinal portion 21 is larger at both ends than at the center portion. Although the method of 2 was applied, it is not limited to this. For example, the second method may be applied to the beam portion 25, the first method may be applied to the base portion 23, or the beam portion 25 or the base portion 23 may be combined with the first and second methods. 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 portion 25 of the plate 20 of the tongue 7 and the inclined surface 75 provided on the base portion 23 are formed by chamfering. good. Further, in the first embodiment, the inclined surfaces 74 and 75 are processed flat, but the inclined surfaces 74 and 75 may be processed into other surface shapes such as curved surfaces.

In the first embodiment, the inclination angles of the inclined surfaces 74 and 75 of the plate 20 are both the same as the inclination angle α of the tongue 7 with respect to the seat belt 4. However, the inclination angles of the inclined surfaces 74 and 75 are the angle α The angles may be different from each other, and the angles may be different from each other.

[Second embodiment]
A second embodiment will be described with reference to FIGS. 9 to 10. FIG. FIG. 9 is a front side plan view of the plate 120 of the tongue 107 according to the second embodiment. FIG. 10 is a cross-sectional view of the plate 120 shown in FIG. 9 taken along line FF.

As shown in FIG. 10, in the second embodiment, the inclined surface 75 is not provided at the end of the base portion 23 forming the insertion hole 71, and the inclined surface 74 is provided only at the beam portion 25. Different from the embodiment. In such a structure in which the base portion 23 does not have an inclined surface, in order to form the base portion 23 so that the cross-sectional area of the base portion 23 is smaller at both end portions than at the center portion, the base portion 23 and the beam portions 25 are formed as shown in FIG. Similarly, the width of the buckle 8 and the longitudinal portion 21 along the inserting/removing direction is smaller at both end portions than at the central portion.

In this manner, even with the configuration in which the beam portion 25 of the plate 120 of the tongue 107 is provided with the inclined surface 74 and the base portion 23 is not provided with the inclined surface, the cross-sectional area of the beam portion 25 and the base portion 23 of the plate 120 is reduced from the central portion to the both ends. can be formed so as to be smaller than that of the tongs 107. Therefore, similar to the first embodiment, it is possible to achieve the effect that the size reduction of the tongs 107 can be promoted.

In addition, as shown in FIG. 10, in the second embodiment, bending is performed at substantially the middle position of the beam portion 25 in the x direction, so that the resistance of the beam portion 25 to the bending moment can be increased.

Contrary to the second embodiment, the base portion 23 of the plate 120 of the tongue 107 may be provided with the inclined surface 75 and the beam portion 25 may not be provided with an inclined surface.

The present embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Design modifications to these specific examples by those skilled in the art are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each specific example described above and its arrangement, conditions, shape, etc. are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

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 stopper 70 molded portion 71 insertion hole 74, 75 inclined surface 76 receiver Inclined surface for part 77 Stopper receiving part

Claims (6)

A plate having a longitudinal portion that can be inserted into the buckle and a wide portion that is wider than the longitudinal portion on the side opposite to the distal end of the longitudinal portion, and at least a portion of the wide portion is covered. prepared,
The wide portion includes a base portion connected to the longitudinal portion, a beam portion extending in the longitudinal direction of the wide portion, a connecting portion connecting the base portion and the beam portion at both ends in the longitudinal direction, the base portion, an insertion hole formed by the beam portion and the connection portion and through which the seat belt is inserted;
At least one of the beam portion and the base portion is formed so that the cross-sectional area when viewed in the longitudinal direction is smaller at both end portions than at the central portion in the longitudinal direction,
The beam portion or the base portion formed so that the cross-sectional area is smaller at the both end portions than at 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 is inserted through the insertion hole and is not worn by the occupant, and
The inclined surface is formed by chamfering or chamfering,
The length of the inclined surface along the insertion/extraction direction of the buckle and the longitudinal portion is formed so that the both ends are larger than the central portion .
tongs . A plate having a longitudinal portion that can be inserted into the buckle and a wide portion that is wider than the longitudinal portion on the side opposite to the distal end of the longitudinal portion, and at least a portion of the wide portion is covered. prepared,
The wide portion includes a base portion connected to the longitudinal portion, a beam portion extending in the longitudinal direction of the wide portion, a connecting portion connecting the base portion and the beam portion at both ends in the longitudinal direction, the base portion, an insertion hole formed by the beam portion and the connection portion and through which the seat belt is inserted;
At least one of the beam portion and the base portion is formed so that the cross-sectional area when viewed in the longitudinal direction is smaller at both end portions than at the central portion in the longitudinal direction,
both the beam portion and the base portion are formed such that the cross-sectional area is smaller at the end portions than at the central portion;
The beam and the base have ends forming the insertion hole,
The end portion has an inclined surface that faces the seat belt when the seat belt is inserted through the insertion hole and is not worn by the occupant, and
The inclined surface is formed by chamfering or chamfering,
The beam portion is formed such that the width along the insertion/extraction direction between 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/extraction direction of the buckle and the longitudinal portion is greater at the both end portions than at the central portion .
tongs . A plate having a longitudinal portion that can be inserted into the buckle and a wide portion that is wider than the longitudinal portion on the side opposite to the distal end of the longitudinal portion, and at least a portion of the wide portion is covered. prepared,
The wide portion includes a base portion connected to the longitudinal portion, a beam portion extending in the longitudinal direction of the wide portion, a connecting portion connecting the base portion and the beam portion at both ends in the longitudinal direction, the base portion, an insertion hole formed by the beam portion and the connection portion and through which the seat belt is inserted;
At least one of the beam portion and the base portion is formed so that the cross-sectional area when viewed in the longitudinal direction is smaller at both end portions than at the central portion in the longitudinal direction,
both the beam portion and the base portion are formed such that the cross-sectional area is smaller at the end portions than at the central portion;
The beam and the base have ends 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 is inserted through the insertion hole and is not worn by the occupant, and
The inclined surface is formed by chamfering 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/extraction direction between the buckle and the longitudinal portion is smaller at the both end portions than at the central portion .
tongs . The beam portion or the base portion formed so that the cross-sectional area is smaller at the both end portions than at the central portion,
The width of the buckle and the longitudinal portion along the insertion/extraction direction is formed so that the both ends are smaller than the central portion.
The tongs according to any one of claims 1-3. a stopper receiving portion that receives a tongue stopper protruding from the main surface of the seat belt and restricts movement of the tongue with respect to the seat belt when the seat belt is not worn by an occupant; prepared,
The stopper receiving portion is recessed inward from the surface of a portion of the mold portion covering the plate in which the base portion is embedded,
the plate has a receiving portion inclined surface facing the stopper receiving portion at the central portion of the end portion forming the insertion hole of the base portion and overlapping with the stopper receiving portion;
The receiving part inclined surface is formed by chamfering or chamfering,
The tongs according to any one of claims 1-4 . At least one of the beam portion and the base portion faces the seat belt at the end portion forming the insertion hole when the seat belt inserted through the insertion hole is not worn by the occupant. having the inclined surface that
an inclination angle of the receiving part inclined surface is greater than an inclination angle of the inclined surface,
The tongs according to claim 5 .

Images