JP2020111255A - Buckle support structure of seat belt device - Google Patents

Abstract

To provide a buckle support structure of a seat belt device which enables a vertical position of a buckle to be adjusted with relatively easy operation.SOLUTION: A buckle support structure of a seat belt device 10 includes: a buckle 13 to which a tongue 12 provided at a seat belt 11 is detachably fixed; and a stay member 17 which is disposed at a side part of a seat 1 and in which the lower end side is fixed to the seat 1 and the buckle 13 is attached to an upper end part. The buckle 13 includes a restriction member 100 which is attached to the stay member 17 so as to be slidable along the stay member 17 and moved by a tip part of the tongue 12 contacting therewith when the tongue 12 is inserted to restrict sliding of the buckle 13 relative to the stay member 17.SELECTED DRAWING: Figure 2

Description

The present invention relates to a seat belt including a buckle that detachably fixes a tongue provided on a belt, and a stay member that is arranged on a side portion of a seat and has a lower end side fixed to the seat and a buckle attached to an upper end portion. More particularly, the present invention relates to a buckle support structure capable of adjusting the height of a buckle (adjusting a fixed position with respect to a stay member).

BACKGROUND ART Conventionally, a vehicle such as a passenger car is equipped with a seatbelt device that restrains an occupant sitting on a seat with a seatbelt (also simply referred to as a belt) as a device for protecting an occupant in a vehicle collision. .. Typical examples of seatbelt devices mounted on a vehicle include, for example, a shoulder belt for restraining the upper half of the occupant (shoulder, chest, etc.) and a lap belt for restraining the lower half of the occupant (abdomen, thigh, etc.). There is a so-called three-point type seat belt device that supports a belt-shaped seat belt (webbing) including at three points. By restraining the occupant with such a seat belt device, movement of the occupant during a vehicle collision or the like can be suppressed and an impact input to the occupant can be suppressed.

Further, the seat belt device has a tongue attached to the seat belt, and a buckle arranged on a side portion of the seat to detachably fix the tongue, and by engaging the tongue with the buckle, The belt is designed to be stretched around the shoulders and waist of the occupant seated on the seat.

In addition, a child seat may be mounted on a vehicle seat, particularly a passenger seat or a rear seat, for mounting an infant, and most of these child seats have a structure in which they are fixed to the seat by a seat belt. That is, the seat belt device is used not only for an occupant sitting on the seat but also for fixing the child seat to the seat.

Here, the buckle of the seatbelt device is generally self-supported by a stay member so that a tip portion (an upper portion having a tongue insertion port) is located above an upper surface of a seat cushion. Accordingly, the occupant seated on the seat can grasp the position of the buckle only by the feel of the hand, and can easily attach the tongue to the buckle.

However, if the buckle is fixed at this position, the child seat may not be stably fixed to the seat when the child seat is mounted on the seat. For example, in some cases, it may be preferable to fix the child seat with the buckle disposed below the upper surface of the seat cushion. For this reason, if the position of the buckle is fixed, the position of the buckle may be too high, and the child seat may not be stably held on the seat.

In order to solve such a problem, there has been proposed a seat belt device in which the vertical position (height position) of the buckle can be adjusted. For example, there is one in which a self-supporting buckle is supported by an actuator such as a cylinder or a motor so as to be vertically displaceable (see Patent Document 1).

JP, 9-24796, A

As described in Patent Document 1, by using an actuator or the like to move the buckle in the vertical direction, it is possible to stably hold not only the occupant but also the child seat with respect to the seat. There is also a problem that the buckle structure in the belt device becomes complicated and the cost becomes high.

On the other hand, it may be possible to manually adjust the vertical position of the buckle, but in that case, the occupant changes the height of the buckle in a limited space such as the passenger seat or the rear seat. Work is required. In particular, when fixing a child seat, it is inevitable to operate in a limited space beside the seat. Therefore, there is a demand for a buckle support structure that can change the vertical position of the buckle by the simplest possible manual operation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a buckle support structure for a seat belt device capable of adjusting the vertical position of the buckle with a relatively simple operation.

One aspect of the present invention that solves the above-mentioned problems is a buckle that detachably fixes a tongue provided on a belt, and a buckle that is disposed on a side portion of a seat and a lower end side is fixed to the seat and the buckle is attached to an upper end portion. A buckle structure of a seat belt device including a stay member, wherein the buckle is mounted on the stay member so as to be slidable along the stay member, and when the tongue is inserted. A buckle support structure for a seat belt device, comprising: a restricting member that moves when the tip of the tongue comes into contact with the tongue to restrict the sliding movement of the buckle with respect to the stay member.

Here, the regulation member is, for example, a first lock member that slides toward the stay member when the tip of the tongue contacts, and the stay member slides into the first lock. It is preferable that a plurality of groove portions into which the members enter are provided at predetermined intervals along the vertical direction.

Further, it is preferable that an abutting surface of the first lock member with which the tip portion of the tongue abuts is an inclined surface that is inclined with respect to the inserting direction of the tongue.

Further, it is preferable that the buckle includes a biasing member that biases the first lock member toward the tongue side.

Further, the regulation member includes, for example, a tooth portion that engages with a groove portion formed in the stay member, and a tip end portion of the tongue comes into contact with a gear member that rotates as the buckle slides relative to the stay member. Therefore, it is preferable that the second lock member has a claw portion that moves in the inserting direction of the tongue and engages between the tooth portions of the gear member.

Furthermore, it is preferable that the buckle includes an urging member that urges the second lock member in a direction opposite to a direction in which the tongue is inserted.

According to the buckle supporting structure of the seat belt device of the present invention, the vertical position of the buckle can be adjusted by a relatively simple manual operation.

It is a figure which shows schematic structure of the seatbelt apparatus with which the seat was equipped. It is a perspective view showing a buckle support structure of a seat belt device concerning Embodiment 1 of the present invention. It is a sectional view showing a buckle support structure of a seat belt device concerning Embodiment 1 of the present invention. It is a figure explaining operation|movement of the buckle with which the seatbelt apparatus which concerns on Embodiment 1 of this invention is equipped. It is a figure which shows the use condition of the seatbelt apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the use condition of the seatbelt apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the buckle support structure of the seatbelt apparatus which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the buckle support structure of the seatbelt apparatus which concerns on Embodiment 2 of this invention. It is a figure explaining operation|movement of the buckle with which the seatbelt apparatus concerning Embodiment 2 of this invention is equipped.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(Embodiment 1)
FIG. 1 is a diagram showing a schematic configuration of a vehicle seat and a seat belt device mounted on the seat. As shown in FIG. 1, a vehicle seat 1 includes a seat cushion 2, a seat back 3, and a headrest 4, and the seat cushion 2 is fixed to a metal frame 5 attached to a floor of the vehicle. ing.

The seat belt device 10 according to the present embodiment includes a seat belt (webbing) 11 that is provided on each seat 1 of a vehicle and that restrains a seated occupant from the front. A tongue 12 is attached to the seat belt 11, and a buckle 13 that holds the tongue 12 is provided on a side portion of the seat 1.

A tongue hole 15 into which the tongue 12 is inserted is formed in an upper end portion of the cover member 14 of the buckle 13, and the tongue 12 inserted from the tongue hole 15 is engaged in the cover member 14 although not shown. A mechanism (lock mechanism) for holding the joint is provided. Since this lock mechanism may be an existing one, detailed description thereof is omitted here.

When the tongue 12 is engaged and held by the buckle 13, the seat belt 11 is hung on the shoulder or waist of the occupant sitting on the seat 1, or hung on the child seat. Fixed in the state.

A release switch 16 is provided on the upper end surface of the buckle 13 (cover member 14) together with the tongue hole 15. The occupant operates the release switch 16 (by pressing it) to release the fixation of the tongue 12 by the buckle 13. The release switch 16 may be provided at an appropriate position according to the lock mechanism, and may be provided on the side surface of the buckle 13, for example.

Such a buckle 13 is connected to the frame 5 by a stay member 17 made of metal. One end (lower end) of the stay member 17 is swingably attached to the frame 5, and the other end (upper end) thereof extends near the surface of the seat cushion 2. The buckle 13 is attached to the upper end of the stay member 17. That is, the buckle 13 is supported by the upper end of the stay member 17.

The present invention is characterized by the support structure of the buckle 13 that constitutes such a seat belt device 10. Hereinafter, the support structure of the buckle 13 will be described in more detail. FIG. 2 is a view showing a buckle support structure of the seat belt device according to the first embodiment, and is an exploded perspective view of the buckle. FIG. 3 is an assembled sectional view of the buckle and is a sectional view corresponding to the line AA′ in FIG. 2.

As described above, the buckle 13 (cover member 14) is provided with the lock mechanism (not shown) for holding the tongue 12, and as shown in FIGS. 2 and 3, the buckle for the stay member 17 is provided. A guide member 18 for guiding the sliding movement of 13 is provided.

The guide member 18 is arranged in the buckle 13 on the opposite side of the lock mechanism with the tongue hole 15 interposed therebetween. For example, in FIG. 3, the guide member 18 is disposed on the right side of the tongue hole 15 in the buckle 13, and although not shown, the lock mechanism is provided on the left side of the tongue hole 15.

The guide member 18 is provided with an insertion hole 19 into which the stay member 17 is slidably inserted. By inserting the stay member 17 into the insertion hole 19 of the guide member 18, the buckle 13 can be slid vertically with respect to the stay member 17.

It is preferable that frictional resistance is generated between the stay member 17 and the guide member 18 to such an extent that the buckle 13 can be manually slid. That is, it is preferable that the position of the buckle 13 be held by frictional resistance when the buckle 13 is slid.

Further, it is preferable that the guide member 18 is provided with a stopper mechanism that restricts excessive sliding movement of the buckle 13. The configuration of the stopper mechanism is not particularly limited, but in the present embodiment, the first stopper portion 20 that closes a part of the insertion hole 19 is provided at the upper end portion of the guide member 18. By contacting the upper end portion of the stay member 17 with the first stopper portion 20, the downward sliding movement of the buckle 13 can be regulated. That is, it is possible to prevent the height of the buckle 13 from becoming excessively low.

Further, the upper end surface of the stay member 17 is provided with a projecting portion 21 projecting to the outside of the stay member 17 (for example, the tongue 12 side), and the slit portion 22 is provided at a position corresponding to the projecting portion 21 of the guide member 18. It is provided. The lower end portion of the slit portion 22 serves as a second stopper portion 23 with which the protruding portion 21 abuts. Then, the protruding portion 21 comes into contact with the second stopper portion 23, so that the upward sliding movement of the buckle 13 is restricted. Thereby, the stay member 17 can be prevented from coming off from the buckle 13. That is, it is possible to prevent the height of the buckle 13 from becoming excessively high.

Further, inside the buckle 13, there is provided a restriction member 100 that moves when the tip of the tongue 12 comes into contact with the tongue 12 when the tongue 12 is inserted and moves to restrict the sliding movement of the buckle 13 with respect to the stay member 17.

As shown in FIGS. 2 and 3, in the present embodiment, the buckle 13 is provided with the first lock member 24 as the restricting member 100. The first lock member 24 slides toward the stay member 17 when the tip of the tongue 12 contacts. The stay member 17 is provided with a plurality of groove portions 25 into which the slidingly moved first lock member 24 enters, at predetermined intervals along the vertical direction. The groove 25 is provided without penetrating the stay member 17 in the present embodiment, but may be provided penetrating the stay member 17.

Further, a rectangular through hole 26 that penetrates to the insertion hole 19 is provided on one side wall of the guide member 18 (a wall on the tongue hole 15 side), and the first lock member 24 has a through hole 26 inside. Is held slidably.

The first lock member 24 is provided continuously from a main body 27 having a substantially rectangular outer shape slidably inserted into the through hole 26 and an end surface of the main body 27 on the stay member 17 side. And a pin portion 28 that enters the rectangular groove portion 25 formed in. An end surface (end surface on the tongue hole 15 side) 27a of the body portion 27 on the side opposite to the stay member 17 is inclined so as to face upward (on the tongue hole 15 side) with respect to the inserting direction of the tongue 12 into the buckle 13. It is an inclined surface.

Here, in the first lock member 24, when the seat belt device 10 is unused, that is, when the tongue 12 is not inserted into the buckle 13 (initial state), the end surface 27a of the main body portion 27 has a tongue hole. It is held at a first position facing 15 (see FIG. 4A).

As described above, the first lock member 24 is connected to the guide member 18 by the first biasing member 29 formed of a coil spring or the like, and is biased by the first biasing member 29. Thus, the pin portion 28 is held at the position (first position) where it does not enter the groove portion 25 of the stay member 17. Therefore, in the initial state, the buckle 13 is slidable with respect to the stay member 17. That is, in the initial state, the vertical position adjustment of the buckle 13 is possible (see FIG. 4A).

When the occupant uses the seat belt device 10, the buckle 13 is moved to a desired position in the vertical direction with respect to the stay member 17 in the initial state, and in this state, the tip portion of the tongue 12 is buckled from the tongue hole 15. Insert into 13. The inserted tongue 12 is fixed to the buckle 13 by the lock mechanism (not shown) described above.

At that time, the tip of the tongue 12 inserted into the buckle 13 comes into contact with the end surface 27 a of the main body 27 that constitutes the first lock member 24. As described above, the end surface 27a of the main body portion 27 is inclined with respect to the inserting direction of the tongue 12. Therefore, when the tongue 12 comes into contact with the end surface 27a, the first lock member 24 has the first attachment. It slides toward the stay member 17 side against the biasing force of the biasing member 29. Then, when the tongue 12 is inserted to a position where it is fixed to the buckle 13, the first lock member 24 has a position (second position) where the pin portion 28 enters (engages) into the groove portion 25 of the stay member 17. Slide to (see FIG. 4(b)).

In this way, when the pin portion 28 of the first lock member 24 enters the groove portion 25 of the stay member 17, the sliding movement of the buckle 13 with respect to the stay member 17 is restricted. That is, the buckle 13 is fixed to the stay member 17.

After that, when the occupant operates the release switch 16 to release the fixation of the tongue 12 to the buckle 13 (when the tongue 12 is pulled out from the buckle 13), the first lock member 24 causes the first urging member 29 to move. It moves to the tongue hole 15 side by the urging force of. That is, the first lock member 24 moves from the second position to the first position (initial position) and is held. As a result, the vertical position adjustment of the buckle 13 can be performed again.

As described above, according to the buckle support mechanism of the seat belt device 10 according to the present embodiment, the height of the buckle 13 can be relatively easily adjusted to an appropriate position according to the usage situation by a manual operation of an occupant. be able to.

Specifically, for example, as shown in FIG. 5, when the seat belt 11 is worn on the occupant C seated on the seat 1, the position of the buckle 13 is relatively high (close to the upper end of the stay member 17). Adjustment to the side) facilitates the operation of inserting the tongue 12 into the buckle 13.

Further, for example, as shown in FIG. 6, when the seat belt 11 is mounted on the child seat 200 mounted on the seat 1, the position of the buckle 13 is adjusted to be relatively low (the side far from the upper end of the stay member 17). By doing so, the child seat 200 can be stably fixed to the seat 1.

More specifically, the position of the buckle 13 is lowered and adjusted so as to be near the upper surface of the seat cushion 2. In this state, the front end of the tongue 12 inserted through the belt insertion passage 201 of the child seat 200 is inserted into the buckle 13, so that the seat belt 11 is brought into close contact with almost the entire lower surface of the belt insertion passage 201 of the child seat 200. Accordingly, the child seat 200 can be fixed to the seat 1 in a stable posture.

Note that, in the present embodiment, the first lock member 24 having a substantially rectangular outer shape is illustrated, but the outer shape of the first lock member 24 is not particularly limited and may be, for example, a circular shape. In that case, it is preferable that the opening shape of the groove portion 25 of the stay member 17 is also circular according to the opening shape.

Further, in the present embodiment, the configuration in which the guide member 18 is provided inside the cover member 14 of the buckle 13 is illustrated, but the guide member 18 may be provided outside the cover member 14.

(Embodiment 2)
7 is an exploded perspective view showing a buckle support structure of a seat belt device according to a second embodiment, FIG. 8 is an assembled sectional view of the buckle, and a sectional view corresponding to the line BB′ in FIG. 7. is there. The same members as those in the first embodiment are designated by the same reference numerals, and duplicated description will be omitted. Further, in the present embodiment, illustration and description of the structure (first stopper portion and the like) for restricting the movement of the buckle 13 are omitted.

The present embodiment has the same configuration as that of the first embodiment except that the configuration related to the restriction member is different. As shown in FIGS. 7 and 8, the restriction member 100A according to the present embodiment is slidable in the gear member 31 rotatably supported in the through hole 26A formed in the guide member 18 and the through hole 26A. And a second lock member 32 disposed at.

The gear member 31 includes a tooth portion 33 that engages with the groove portion 25</b>A formed in the stay member 17, and rotates as the buckle 13 slides relative to the stay member 17. That is, the gear member 31 and the stay member 17 are formed so that the tooth portions 33 of the gear member 31 sequentially mesh with the adjacent groove portions 25A of the stay member 17 as the buckle 13 slides. Note that the groove portion 25A in the second embodiment is formed in such a size that the tooth portion 33 of the gear member 31 is engaged with the groove portion 25A of the first embodiment, which corresponds to the pin portion 28 of the first lock member 24.・Different sizes.

Further, the side wall of the guide member 18 is provided with a rectangular recess 34 that is continuous above the through hole 26A, and the second lock member 32 has a direction in which the tongue 12 is inserted in the recess 34 ( It is held slidably in the vertical direction.

The second lock member 32 is, for example, a plate-shaped member having a width approximately equal to the width of the tip portion of the tongue 12, and one end side (tip side) thereof is housed in the recess 34 so as to be slidable in the vertical direction. Has been done. The other end of the second lock member 32 extends to a position facing the tongue hole 15.

The lower surface of the second lock member 32 on one end side is provided with a claw portion 35 protruding downward. In this embodiment, the claw portion 35 is provided across the width direction of the second lock member 32. The claw portion 35 may be provided on a part of the second lock member 32.

Here, when the seat belt device 10 is unused, that is, when the tongue 12 is not inserted into the buckle 13 (initial state), the second lock member 32 is located near the upper end of the recess 34. It is held in position 1.

In the present embodiment, the second lock member 32 is connected to the guide member 18 by the second biasing member 36 formed of a tension coil spring or the like. That is, the upper surface of the second lock member 32 and the upper surface of the recessed portion 34 are connected by the second biasing member 36, and the pulling force of the second biasing member 36 pulls the second lock member 32 to the first position. Is held.

Therefore, in the initial state, the buckle 13 is slidable with respect to the stay member 17. That is, in the initial state, the vertical position of the buckle 13 can be adjusted.

A second biasing member 36 made of, for example, a compression coil spring is provided between the second lock member 32 and the bottom surface of the recess 34, and the second lock member 32 is provided by the second biasing member 36. May be pushed up to and held at the first position.

When the occupant uses the seat belt device 10, the position of the buckle 13 with respect to the stay member 17 in the vertical direction is moved to a desired position in the initial state. At this time, the gear member 31 and the stay member 17 relatively move while the tooth portion 33 and the groove portion 25A mesh with each other. After moving the buckle 13 to a desired position, the tip of the tongue 12 is inserted into the buckle 13 through the tongue hole 15. The inserted tongue 12 is fixed to the buckle 13 by the lock mechanism (not shown) described above.

At that time, as shown in FIG. 9, the tip portion of the tongue 12 inserted into the buckle 13 comes into contact with the second lock member 32 and moves downward together with the tongue 12. Then, when the tongue 12 is inserted to the position where it is fixed to the buckle 13, the second lock member 32 moves to the second position, and the claw portion 35 enters between the adjacent tooth portions 33 of the gear member 31 ( Engage).

In this way, in the state where the claw portion 35 of the second lock member 32 enters between the tooth portions 33 of the gear member 31, the rotation of the gear member 31 is restricted. Therefore, the sliding movement of the buckle 13 with respect to the stay member 17 is also restricted. That is, the buckle 13 is fixed to the stay member 17.

After that, when the occupant operates the release switch 16 to release the fixing of the tongue 12 to the buckle 13 (when the tongue 12 is pulled out from the buckle 13), the second lock member 32 causes the second biasing member 36 to move. It is moved to and held at the first position (initial position) by the pulling force (see FIG. 8). As a result, the gear member 31 also becomes rotatable and the vertical position of the buckle 13 can be adjusted again.

As described above, also with the buckle support mechanism of the seat belt device 10 according to the present embodiment, the height of the buckle 13 can be relatively easily adjusted to an appropriate position according to the usage situation by the occupant's manual operation. You can

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. The present invention can be modified as appropriate without departing from the spirit thereof.

1 seat 2 seat cushion 3 seat back 4 headrest 5 frame 10 seat belt device 11 seat belt (webbing)
12 tongue 13 buckle 14 cover member 15 tongue hole 16 release switch 17 stay member 18 guide member 19 insertion hole 20 first stopper portion 21 projecting portion 22 slit portion 23 second stopper portion 24 first lock member 25, 25A groove portion 26, 26A Through hole 27 Main body portion 28 Pin portion 29 First urging member 31 Gear member 32 Second lock member 33 Teeth portion 34 Recessed portion 35 Claw portion 36 Second urging member 100 Regulator member 200 Child seat 201 Belt Insertion passage

Claims (6)

A buckle for a seat belt device, which includes a buckle that detachably fixes a tongue provided on a belt, and a stay member that is disposed on a side portion of a seat and has a lower end side fixed to the seat and the buckle is attached to an upper end portion. A support structure,
The buckle is mounted on the stay member so as to be slidable along the stay member, and moves when the tip end of the tongue comes into contact with the stay member when the tongue is inserted to move the buckle with respect to the stay member. A buckle support structure for a seat belt device, comprising a restricting member for restricting sliding movement of the buckle. The buckle support structure for the seat belt device according to claim 1,
The restricting member is a first lock member that slides toward the stay member when the tip portion of the tongue contacts,
A buckle support structure for a seat belt device, wherein the stay member is provided with a plurality of groove portions, into which the first lock member that has slid and moved enters, along the vertical direction at predetermined intervals. The buckle support structure for the seat belt device according to claim 2,
The buckle support structure for a seat belt device, wherein an abutment surface of the first lock member with which the tip portion of the tongue abuts is an inclined surface that is inclined with respect to the inserting direction of the tongue. A buckle support structure for a seat belt device according to claim 2 or 3,
The buckle support structure for a seat belt device, wherein the buckle includes a biasing member that biases the first lock member toward the tongue side. The buckle support structure for the seat belt device according to claim 1,
The regulating member includes a tooth portion that engages with a groove formed in the stay member, and a gear member that rotates with the sliding movement of the buckle with respect to the stay member and a tip portion of the tongue come into contact with each other, so that A second lock member having a claw portion that moves in the inserting direction of the tongue and engages between the tooth portions of the gear member, and a buckle support structure for a seat belt device. The buckle support structure for the seat belt device according to claim 5,
The buckle support structure for a seat belt device, wherein the buckle includes a biasing member that biases the second lock member in a direction opposite to a direction in which the tongue is inserted.

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