JP2010070158A - Buckle structure of seat belt apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a buckle from becoming an obstacle when a seat back is inclined forward and also when the seat back is reclined. <P>SOLUTION: With a vehicle seat 10 to which this buckle structure is applied, when a seat back 14 is in an uprising position, a wire 24 projects a buckle 16 upward on a seating surface 12A of a seat cushion 12. When the seat back 14 is inclined forward and when it is reclined, the wire 24 with one end thereof in a longitudinal direction connected to a notch 34 of the seat back 14 is pulled and the buckle 16 connected to the other end of the wire 24 in the longitudinal direction is pulled into a buckle holding hole 22 of the seat cushion 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a buckle structure of a seat belt device.

2. Description of the Related Art Conventionally, there is known a seat belt buckle structure in which a seat belt buckle is tilted in conjunction with a seat back forward tilting operation (see, for example, Patent Document 1). In this buckle structure, the seat back and the buckle are connected via an urging means, and when the butt of the occupant interferes with the buckle, the buckle retracts so as to suppress the uncomfortable feeling given to the occupant. Yes.
JP 2007-176411 A

  By the way, in a seat in which the seat back can be reclined, it is desirable that the buckle does not interfere with the occupant when the occupant lies with a reclining inclination angle of the seat back increased.

  In view of the above facts, an object of the present invention is to provide a buckle structure for a seat belt device that can prevent or suppress the buckle from becoming an obstacle in both the forward and reclining state of the seat back.

  The buckle structure of the seat belt device according to claim 1 is a buckle structure of a seat belt device applied to a seat in which the seat back can be tilted forward and reclining with respect to the seat cushion, and is used for restraining an occupant. A buckle to which a tongue plate provided on the webbing is connected, one end in the longitudinal direction is connected to the buckle, and one end in the longitudinal direction extending to the lower side of the buckle is movable along the longitudinal direction A wire supported by a seat cushion, and a support member provided on the seat cushion below the buckle, and a longitudinal intermediate portion of the wire is wound so as not to be detached, and provided on the seat back, The wire has a connecting portion to which the other longitudinal end of the wire is connected, and the seat back is the seat cushion. In a state of standing up against the seat cushion, the buckle protrudes above the seat cushion seating surface by the wire, and the connecting portion separates from the support member with the forward and reclining of the seat back. And a buckle moving mechanism that pulls the buckle downward.

  In the buckle structure of the seat belt device according to the first aspect, in the state where the seat back stands up with respect to the seat cushion, the wire of the buckle moving mechanism causes the buckle to protrude above the seating surface of the seat cushion. For this reason, the occupant seated on the seat cushion can easily connect the tongue plate provided on the occupant restraining webbing to the buckle. Further, even when the occupant's buttocks or the like interferes with the protruding buckle, the buckle can be retracted by bending the wire. Thereby, the discomfort given to a passenger | crew can be suppressed. Further, when the seat back is tilted forward with respect to the seat cushion and reclining, the wire having the other end portion in the longitudinal direction connected to the connecting portion of the seat back is pulled, and one end portion in the longitudinal direction of the wire is pulled. The buckle connected to is pulled down. For this reason, it is possible to prevent or suppress the buckle from interfering in both the forward and reclining state of the seat back.

  The buckle structure of the seat belt device according to claim 2 is the buckle structure of the seat belt device according to claim 1, wherein the seat cushion opens at the seating surface and is retracted by the buckle moving mechanism. It has a buckle receiving hole for receiving the buckle, and the buckle is connected to the wire in a state where its longitudinal direction is along the longitudinal direction on one end side in the longitudinal direction of the wire.

  In the buckle structure of the seat belt device according to claim 2, when the seat back is tilted forward with respect to the seat cushion and reclining, the buckle connected to one end portion in the longitudinal direction of the wire is the wire. Is pulled into the buckle receiving hole of the seat cushion. Here, since the longitudinal direction of the buckle is along the longitudinal direction (moving direction) on one end side of the longitudinal direction of the wire, the buckle is drawn into the buckle accommodation hole along its own longitudinal direction. For this reason, the opening part of a buckle accommodation hole can be made small, and, thereby, the appearance of a seat cushion can be made favorable.

  As described above, in the buckle structure of the seat belt device according to the present invention, it is possible to prevent or suppress the buckle from becoming an obstacle in both the forward and reclining state of the seat back.

  FIG. 1 is a schematic side view of a vehicle seat 10 configured by applying a buckle structure of a seat belt device according to an embodiment of the present invention. Moreover, the partial structure of this vehicle seat 10 is shown by the longitudinal cross-sectional view by FIGS. In the figure, the arrow FR indicates the front direction of the vehicle seat 10, the arrow UP indicates the upward direction of the vehicle seat 10, and the arrow W indicates the width direction of the vehicle seat 10.

  The vehicle seat 10 according to the present embodiment is a so-called tumble seat, and includes a seat cushion 12 that supports the buttocks of the seated occupant and a seat back 14 that supports the back of the seated occupant. The lower end of the seat back 14 is connected to the rear end of the seat cushion 12 via a reclining mechanism (not shown). As a result, the seat back 14 rises upward from the rear end portion of the seat cushion 12 (the position shown in FIGS. 1 and 2), and the forward-turned position (from FIG. Between the seat cushion 12 and the flat position (the position shown in FIG. 4) which is reclined to the rear side as much as possible.

  The state in which the seat back 14 is arranged at the flat position (flat state) does not mean only the state in which the seat back 14 is horizontal (flat), but the seat back 14 is gently inclined. It includes the state that is. In other words, the flat state means a state in which the reclining inclination angle of the seat back 14 is increased so as to be impossible during driving.

  As shown in FIGS. 2 to 5, a buckle 16 is provided on the rear end side of the seat cushion 12. The buckle 16 constitutes a vehicle seat belt device and corresponds to a tongue plate 20 attached to an occupant restraining webbing 18 shown in FIG. The tongue plate 20 is provided with a plate-like locking piece 20A, and this locking piece 20A is inserted into an insertion hole (not shown) formed at the distal end portion (the upper end portion in FIGS. 2 to 5) of the buckle 16. The tongue plate 20 is connected to the buckle 16 by being inserted.

  The buckle 16 described above corresponds to a buckle accommodation hole 22 formed on the rear end side of the seat cushion 12, and is attached to the vehicle seat 10 via a wire 24 constituting a buckle moving mechanism 23.

  The buckle accommodation hole 22 is for accommodating the buckle 16, and opens at the seating surface 12 </ b> A of the seat cushion 12. Further, the wire 24 has flexibility, and an intermediate portion in the longitudinal direction is wound around a cylindrical roller 26 provided at the lower portion of the seat cushion 12.

  The roller 26 constitutes a support member, and is supported so as to be rotatable about the axis with respect to the seat cushion 12 in a state where the axial direction is along the width direction of the seat cushion 12. A guide 28 formed in an arc shape is provided below the roller 26. The guide 28 constitutes a support member together with the roller 26, and is arranged concentrically with the roller 26. The intermediate portion in the longitudinal direction of the wire 24 is inserted between the roller 26 and the guide 28 and wound around the lower portion of the roller 26, and the guide 24 prevents the separation from the roller 26.

  One end of the wire 24 in the longitudinal direction extends from the front side of the roller 26 toward the upper side (buckle 16 side) of the seat cushion 12 and penetrates the through hole 30 formed in the seat cushion 12. . The through hole 30 supports one end of the wire 24 in the longitudinal direction so as to be movable along the longitudinal direction. In addition, the through hole 30 communicates with the inside of the buckle housing hole 22 at the bottom wall portion of the buckle housing hole 22, and one end in the longitudinal direction of the wire 24 is within the buckle housing hole 22. 2 to 5 are connected to the lower end portion).

  The buckle 16 is connected to one end of the wire 24 in the longitudinal direction (direction of arrow R in FIG. 2) along the longitudinal direction (moving direction) on one end side of the wire 24 in the longitudinal direction. Yes.

  On the other hand, the other end in the longitudinal direction of the wire 24 extends from the rear side of the roller 26 toward the upper side of the seat cushion 12 (the seat back 14 side). It is connected to a disk-shaped rotating bracket 32 attached to the lower end of the back 14. The rotation bracket 32 is disposed concentrically with the rotation center S of the seat back 14 with respect to the seat cushion 12 and rotates integrally with the seat back 14.

  A cutout portion 34 as a connecting portion is formed on the outer peripheral portion of the rotating bracket 32, and the other longitudinal end portion of the wire 24 is rotatably connected to the cutout portion 34. This notch 34 is arranged at the lowest point in a state where the seat back 14 is arranged in the standing position (position shown in FIG. 2). In this state, as shown in FIG. 2, the buckle 16 is supported by the wire 24 so as to protrude upward from the seating surface 12 </ b> A of the seat cushion 12.

  On the other hand, as shown in FIG. 3, when the seat back 14 is rotated to the forward position, the notch 34 of the rotary bracket 32 rotates and rises around the rotation center S of the seat back 14. The distance between the notch 34 and the roller 26 is increased (the notch 34 is separated from the roller 26). Therefore, the other end in the longitudinal direction of the wire 24 connected to the notch 34 is pulled upward, and one end in the longitudinal direction of the wire 24 is pulled downward along the through hole 30. As a result, the buckle 16 connected to one end in the longitudinal direction of the wire 24 is drawn into the buckle accommodation hole 22. In this state, the buckle 16 is disposed below the seating surface 12A of the seat cushion 12.

  On the other hand, as shown in FIG. 4, when the seat back 14 is rotated to the flat position, the cutout portion 34 of the rotary bracket 32 rotates and moves forward around the rotation center S of the seat back 14. The distance between the notch 34 and the roller 26 is increased. Therefore, the other end in the longitudinal direction of the wire 24 connected to the notch 34 is pulled upward, and one end in the longitudinal direction of the wire 24 is pulled downward along the through hole 30. As a result, the buckle 16 connected to one end in the longitudinal direction of the wire 24 is drawn into the buckle accommodation hole 22. In this state, the buckle 16 is disposed below the seating surface 12A of the seat cushion 12.

  On the other hand, when the seat back 14 is returned from the flat position or the forward-turned position to the standing position, the notch 34 of the rotary bracket 32 rotates around the rotation center S of the seat back 14 and descends, so that the notch 34 and the roller 26 is shortened (the notch 34 approaches the roller 26). Therefore, the other end in the longitudinal direction of the wire 24 connected to the notch 34 is pushed downward, and one end in the longitudinal direction of the wire 24 is pushed upward along the through hole 30. As a result, the buckle 16 connected to one end portion in the longitudinal direction of the wire 24 is projected to the upper side of the seating surface 12A of the seat cushion 12 (the state shown in FIG. 2).

  Next, the operation of this embodiment will be described.

  In the vehicle seat 10 having the above-described configuration, the wire 24 projects the buckle 16 to the upper side of the seating surface 12A of the seat cushion 12 in a state where the seat back 14 is disposed in the standing position. Therefore, an occupant seated on the seat cushion 12 can easily connect the tongue plate 20 provided on the webbing 18 to the buckle.

  Even when the occupant's buttocks or the like interferes with the protruding buckle 16, the buckle 16 can be retracted by bending the wire 24. Thereby, the discomfort given to a passenger | crew can be suppressed.

  Furthermore, when the seat back 14 is rotated to the forward position and to the flat position, the wire 24 having the other longitudinal end connected to the notch 34 of the seat back 14 is pulled. The buckle 16 connected to one end in the longitudinal direction of the wire 24 is drawn into the buckle accommodation hole 22 of the seat cushion 12. Therefore, it is possible to prevent or suppress the buckle 16 from interfering with the seat back 14 in either the forward-turned state or the reclining state. Further, since the buckle 16 does not interfere with the backrest surface 14A of the seatback 14 in the forward-turned state of the seatback 14, it is possible to prevent the backrest surface 14A from being damaged.

  Further, in the present embodiment, as shown in FIG. 5, since the buckle 16 is pulled downward by the wire 24 even when the seat back 14 is slightly reclined, a so-called submarine phenomenon (occupant restrained by the webbing 18). However, it is possible to suppress the occurrence of a phenomenon in which the posture is such as to sink into the seat cushion 12 when the vehicle suddenly decelerates. In other words, since the occupant is in a comfortable posture when the seat back 14 is reclined, a portion of the webbing 18 that restrains the occupant's waist (so-called lap belt) is disengaged from the occupant's waist when the vehicle suddenly decelerates. Although the posture may be such that the cushion 12 sinks into the cushion 12, in the present embodiment, the buckle 16 is pulled downward in conjunction with the reclining of the seat back 14, so that the binding force of the lap belt is improved and the submarine phenomenon is achieved. Is suppressed.

  Further, in the present embodiment, the buckle 16 is connected to the wire 24 in a state where the longitudinal direction thereof is along the moving direction on one end side of the longitudinal direction of the wire 24. It is moved along the longitudinal direction. For this reason, the opening part of the buckle accommodation hole 22 can be made small, and, thereby, the appearance of the seat cushion 12 can be made favorable.

  In the present embodiment, the buckle moving mechanism 23 for moving the buckle 16 is configured by the wire 24, the roller 26, and the like. Therefore, compared to the case where the buckle moving mechanism is configured using a crank or the like, The configuration can be simplified and the cost of the apparatus can be reduced. Moreover, since the buckle moving mechanism 23 can be configured compactly on the lower side or the rear side of the vehicle seat 10, the appearance of the vehicle seat 10 can be improved.

  In the above-described embodiment, the case where the support member configuring the buckle moving mechanism 23 is configured by the roller 26 and the guide 28 has been described, but the present invention is not limited thereto. For example, the support member may be configured by a pipe curved in an arc shape, and the wire 24 may be inserted inside the pipe.

  In the above embodiment, one end in the longitudinal direction of the wire 24 is supported by the through hole 30 provided in the seat cushion 12. However, the present invention is not limited to this, and a pipe is used as the support member as described above. In this case, one end side of the pipe may be formed straight and the one end side in the longitudinal direction of the wire 24 may be supported by the straight portion.

  Furthermore, in the said embodiment, although it was set as the structure by which the other end part of the longitudinal direction of the wire 24 was connected with the outer peripheral part of the rotation bracket 32 attached to the lower end part of the seat back 14, this invention is not restricted to this, For example, An arm that extends from the rotation center S of the seat back 14 in the rotational radius direction of the seat back 14 may be provided, and the other end in the longitudinal direction of the wire 24 may be connected to the tip of the arm.

1 is a schematic perspective view illustrating a configuration of a vehicle seat configured by applying a buckle structure of a seat belt device according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view showing a partial configuration of the vehicle seat shown in FIG. 1 and in a state in which a seat back is disposed in a standing position. FIG. 2 is a longitudinal sectional view showing a partial configuration of the vehicle seat shown in FIG. 1 and in a state in which a seat back is disposed at a forward position. FIG. 2 is a longitudinal sectional view showing a partial configuration of the vehicle seat shown in FIG. 1 and in a state in which a seat back is disposed at a flat position. FIG. 2 is a longitudinal sectional view showing a partial configuration of the vehicle seat shown in FIG. 1 and in a state in which a seat back is reclined between a standing position and a flat position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat cushion 12A Seating surface 14 Seat back 16 Buckle 18 Webbing 20 Tung plate 22 Buckle accommodation hole 23 Buckle moving mechanism 24 Wire 26 Roller (support member)
28 Guide (support member)
34 Notch (connecting part)

Claims (2)

A buckle structure of a seat belt device applied to a seat in which a seat back can be moved forward and reclining with respect to a seat cushion;
A buckle to which a tongue plate provided on an occupant restraining webbing is connected;
One end in the longitudinal direction is connected to the buckle, and one end in the longitudinal direction extending to the lower side of the buckle is supported by the seat cushion so as to be movable along the longitudinal direction, and the lower side of the buckle A support member provided on the seat cushion, in which the intermediate portion in the longitudinal direction of the wire is wound so as not to be detached, and a connecting portion provided on the seat back and connected to the other end portion in the longitudinal direction of the wire. And when the seat back is standing up with respect to the seat cushion, the buckle protrudes above the seat cushion seating surface by the wire, and the connection is made with the forward and reclining of the seat back. When the portion is separated from the support member, the wire is pulled to pull the buckle downward. And the cycle moving mechanism,
The buckle structure of the seat belt device provided with   The seat cushion has a buckle accommodation hole that opens at the seating surface and accommodates the buckle retracted by the buckle moving mechanism, and the buckle has a longitudinal direction on one end side in the longitudinal direction of the wire. The buckle structure of the seat belt device according to claim 1, wherein the buckle structure is coupled to the wire in a state along the line.

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