JP2008044515A - Vehicular seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular seat belt device capable of easily fitting a seat belt to a seat belt buckle by an occupant. <P>SOLUTION: The seat belt device 9 has an urging means 28, and the urging means 28 comprises an upper coiled spring part 36, a center coiled spring part 38, and a lower coiled spring part 40. When a luggage is placed on an upper surface of a seat cushion 10, a seat belt buckle 24 is pressed by the luggage, and moved from the reference position to the storage position to be stored in a storage recess 34. The urging means 28 urges the seat belt buckle 24 toward the reference position against the luggage. When the luggage is removed, the seat belt buckle 24 is returned to the reference position by the urging force of the urging means 28. Even when a seat is moved, the seat belt buckle 24 is returned to the reference position by the urging force of the urging means 28, and the fitting action of the seat belt 22 to the seat belt buckle 24 by an occupant becomes easy. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle seat belt device, and more particularly to a vehicle seat belt device provided on a seat constituted by a seat cushion and a seat back.

  2. Description of the Related Art Some rear seats for automobile seats have a structure in which a storage portion for storing a seat belt buckle is provided and the buckle is stored in the storage portion when the seat is tilted. In the seat belt device having the storage structure, a notch portion is formed in the cushion body of the seat, and the notch portion serves as a storage portion, and a seat belt buckle is stored in the storage portion. The seat belt buckle is attached to the seat frame so as to be rotatable in the front-rear direction.

Reality No.8-10042

  However, in such a seat belt, for example, when the seat is tilted forward, the seat belt buckle must be stored in the storage portion, and when the seat is returned to the original position and seated, Since it is necessary to adjust the position by rotating in the front-rear direction, the operability is poor. In addition, for example, even in a seat that has a vertical movement mechanism that moves the seat cushion downward along with the forward tilt movement of the seat back, and the seat back can be tilted to a full flat, when the seat cushion is moved downward When the seatbelt buckle has to be stored and then the seat cushion is moved and seated thereafter, it is necessary to take out the seatbelt buckle from the storage portion and adjust the position, which makes the operation complicated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle seat belt device that makes it easy for an occupant to attach a seat belt to a seat belt buckle.

A vehicle seat belt device according to the present invention is a vehicle seat belt device provided on a seat constituted by a seat cushion and a seat back, and is located at a rear portion of the seat belt and the seat cushion and on the seat or the vehicle body. A seatbelt buckle that is attached and to which one end of the seatbelt is detachably attached, a free end of the seatbelt buckle in a storage portion provided on the upper surface of the seat cushion or the front surface of the seatback, and a predetermined position outside the storage portion; And an urging means for urging the seat belt buckle toward a predetermined position.
In the present invention configured as described above, the seat belt buckle is movable between the inside of the storage portion and a predetermined position outside the storage portion. For example, even if the seat cushion or the seat back moves, the seat The belt buckle can move into the storage area, so it will not get in the way. Further, since the urging means for urging the seat belt buckle is provided, the urging means urges the seat belt buckle toward a predetermined position even if the seat belt buckle moves into the storage portion. When the belt buckle is not loaded, the seat belt buckle can be returned to the original position. Therefore, even when the seat is moved, the seat belt buckle returns to the original position, so that the occupant can easily attach the seat belt to the seat belt buckle.

In the present invention, preferably, the seat back is installed so as to be able to tilt forward toward the seat cushion side about a hinge provided on the seat or the vehicle body, and the urging means is configured so that when the seat back tilts forward, The belt buckle is configured to be biased against the front surface of the seat back.
In the present invention configured as above, when the seat back is tilted forward, the seat belt buckle is pushed against the front surface of the seat back and moves. Since the urging means urges the seat belt buckle against the front surface of the seat back, when the seat back returns to the original position from the forward inclined position, the seat belt buckle is also restored to the original by the urging force of the urging means. Return to position. Therefore, even when the seat belt device of the present invention is attached to a seat configured such that the seat back is tiltable forward, the seat belt buckle can be returned to the original position by the urging means.

In the present invention, preferably, the seat belt buckle is configured so that the urging means urges the seat belt buckle against the load when a load by an occupant or a load acts from above.
In the present invention configured as described above, when a load by an occupant or luggage acts from above the seat belt buckle, the seat belt buckle is pushed by the occupant or luggage and moves into the storage portion. Therefore, for example, even when an occupant sits on the upper surface of the seat cushion or when a luggage is placed, the seat belt buckle does not get in the way. At this time, since the urging means urges the seat belt buckle against the load, the seat belt buckle returns to the original position by the urging force of the urging means when the load by the occupant or the luggage is not applied. Therefore, even when a load by an occupant or a load acts on the seat belt buckle from above, the seat belt buckle can be returned to the original position by the urging means.

In the present invention, it is preferable that the seat belt buckle has a downward movement mechanism for moving the seat cushion downward when the seat leans forward, and the urging means is configured such that the seat cushion moves forward when the seat back is inclined forward. When moved downward, the seat belt buckle is moved to the seat cushion housing and urged against the front of the seat back.
In the present invention configured as described above, when the seat cushion moves downward as the seat back is tilted forward by the vertical movement mechanism, the seat belt buckle is pushed against the seat back and moves into the storage portion. At this time, the urging means urges the seat belt buckle against the front surface of the seat back. Thereafter, when the seat cushion is moved upward again by the vertical movement mechanism, the seat belt buckle is returned to the original position by the urging force of the urging means. Therefore, even when the seat belt device of the present invention is attached to a seat having a vertical movement mechanism, the seat belt buckle can be returned to the original position by the urging means.

In the present invention, preferably, the urging means includes a winding spring portion having an upper end connected to the base end of the seat belt buckle and a lower end connected to the seat or the vehicle body and having an axis in the substantially width direction of the vehicle body.
In the present invention configured as described above, since the urging means includes the winding spring portion, the urging means can be configured easily. Further, since the winding spring portion is formed with the substantially width direction of the vehicle body as the axis, the size of the vehicle body in the width direction can be reduced.

In the present invention, preferably, the winding spring portion of the urging means includes at least two first winding spring portions and a second winding spring portion that are connected in series to allow the seat belt buckle to move forward, These first and second spring portions are arranged so that at least a part of them overlaps along the substantially width direction of the vehicle body.
In the present invention having such a configuration, the first winding spring portion and the second winding spring portion are connected in series, so that the urging means can have a simple configuration. Moreover, since the winding spring part is arrange | positioned so that those parts may overlap at least partially along the substantially width direction of a vehicle body, the dimension of the width direction of the whole urging | biasing means can be made small.

In the present invention, preferably, the winding spring portion of the urging means further includes a third winding spring portion that allows the seat belt buckle to move backward and is connected between the first winding spring portion and the second winding spring portion. The first winding spring portion, the second winding spring portion, and the third winding spring portion are arranged so that at least a part of them overlaps along the substantially width direction of the vehicle body.
In the present invention having such a configuration, since the winding spring portion includes the third winding spring portion, the seat belt buckle can be moved rearward. Therefore, the size of the storage portion can be made smaller, and the appearance of the sheet can be improved. Moreover, since the 3rd winding spring part is connected with the 1st winding spring part and the 2nd winding spring part, an urging means can be made into a simple structure. Furthermore, since the first winding spring portion, the second winding spring portion, and the third winding spring portion are arranged so that at least a part of them overlaps along the substantially width direction of the vehicle body, the first winding spring portion and Even when the third winding spring portion is provided in addition to the second winding spring portion, it is possible to reduce the size in the width direction of the entire urging means.

In the present invention, preferably, a webbing member that restricts the length between the seat belt buckle and the seat belt buckle or a mounting portion of the seat belt buckle to the vehicle body and permits the movement of the seat belt buckle by the urging means is provided. Have.
In the present invention having such a configuration, since the seat belt device further includes the webbing member, the extension size of the seat belt buckle is defined, so that the strength of the seat belt device is ensured and the safety of the operation is ensured. Is done. Further, since the webbing member allows the seat belt buckle to move, the seat belt buckle can be moved to a desired position without hindering the movement between the inside of the seat belt buckle storage portion and the predetermined position.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

[First embodiment]
A vehicle seat belt device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing the inside of a vehicle including a seat belt device according to a first embodiment of the present invention. As shown in FIG. 1, the vehicle 2 includes a rear seat 4 in the vehicle interior, and the rear seat 4 includes a right rear seat 6 and a left rear seat 8 that are disposed adjacent to each other. The right rear seat 6 and the left rear seat 8 include a seat cushion 10 and a seat back 12, respectively. Each of the right rear seat 6 and the left rear seat 8 includes a vertical movement mechanism 14 that moves the seat cushion 10 downward in accordance with a forward tilting operation (forward tilt) of the seat back 12. Further, the right rear seat 6 and the left rear seat 8 are each provided with a seat belt device 9.

  FIG. 2 is a side view of the rear seat of the vehicle including the seat belt device according to the first embodiment of the present invention, and is a view showing the vertical movement mechanism. As shown in FIG. 2, the vertical movement mechanism 14 connects the hinge bracket 16 fixed to the floor F, the front link 18 that connects the hinge bracket 16 and the seat cushion 10, and the seat back 12 and the seat cushion 10. The back link 20 is provided. The hinge bracket 16 supports the lower portion of the seat back 12 so as to be rotatable about the hinge center C. One end of the front link 18 is rotatably supported in front of the hinge bracket 16, and the other end is rotatably supported in front of the seat cushion 10. The back link 20 is formed in a substantially L shape, and one end is rotatably attached above the hinge center C of the seat back 12, and the other end supports the rear of the seat cushion 10 so as to be rotatable. When the seat back 12 is tilted forward by such a vertical movement mechanism 14, the seat cushion 10 is moved forward and downward by the back link 20 and the front link 18. Since the seat cushion 10 does not hinder the forward tilt of the seat back 12 by this movement, the seat back 12 can be tilted until the back surface is fully flat as shown by a one-dot chain line in FIG. That is, the rear seat 4 of the present embodiment is a so-called downfold type seat in which the seat back 12 can be tilted forward in a full flat manner.

  3 is a plan view showing the seat belt device 9 according to the first embodiment of the present invention, and is a cross-sectional view taken along line III-III in FIG. FIG. 4 is a side view showing the seat belt device 9 according to the first embodiment of the present invention, as seen along the line IV-IV in FIG. As shown in FIGS. 3 and 4, the seat belt device 9 includes a seat belt 22 (FIG. 1), a seat belt buckle 24, a webbing 26 for attaching the seat belt buckle 24 to the vehicle body 2, and a seat belt buckle 24. And an urging means 28 for urging.

The seat belt buckle 24 is disposed at the rear end of the upper surface of the seat cushion 10 and in front of the front surface of the seat back 12. The front end portion of the seat belt buckle 24 is a free end and projects upward from the upper surface of the seat cushion 10. This position of the seat belt buckle 24 is a position where the seat belt buckle 24 can be easily operated when the seat belt 22 is fixed to the seat belt buckle 24, for example, a position where the seat belt is used, and the seat belt buckle 24 of the present embodiment. This is the reference position.
As will be described in detail later, the biasing means 28 biases the seat belt buckle 24 toward the reference position shown in FIG. For this reason, when the seat belt buckle 24 is in the reference position, no urging force is generated.

  The webbing 26 is made of the same material as the seat belt 22, one end of which is attached to the base end of the seat belt buckle 24 and the other end is attached to a buckle anchor 30 fixed to the vehicle body 2. The seat belt buckle 24 is attached to the webbing 26 so that the seat belt buckle 24 does not extend beyond the length of the webbing 26. Therefore, the webbing 26 regulates the length dimension between the base end portion of the seat belt buckle 24 and the buckle anchor 30 that is the attachment portion to the vehicle body 2, and regulates the extension of the seat belt buckle 24. Further, since the webbing 26 is made of the same cloth material as the seat belt 22, when the seat belt buckle 24 moves downward, the webbing 26 does not hinder the movement of the seat belt buckle 24 by sagging.

  Since the webbing 26 penetrates the seat cushion 10 from below the seat cushion 10 and protrudes to the upper surface, the seat cushion 10 is formed with a through recess 32 through which the webbing 26 penetrates. Here, the penetrating recess 32 is set to a size that allows the webbing 26 and the urging means 28 to pass through the lower portion of the seat cushion 10. A storage recess 34 having a larger size is formed in the upper portion of the through recess 32 so that the seat belt buckle 24 can be stored.

  The biasing means 28 is configured by a single wire having one end attached to the base end portion of the seat belt buckle 24 and the other end attached to the buckle anchor 30. The wire is wound in a cylindrical shape with the width direction of the vehicle body 2 as an axis at predetermined multiple positions (three locations in the present embodiment). With such a shape, the wire has a plurality of winding spring portions, that is, An upper winding spring portion 36, a middle winding spring portion 38, and a lower winding spring portion 40 are formed. Therefore, the urging means 28 has an upper winding spring portion 36, a middle winding spring portion 38, and a lower winding spring portion 40, and these winding spring portions 36, 38, 40 are connected by wires. .

The upper winding spring portion 36 is disposed in the vicinity of the base end portion of the seat belt buckle 24 and on the front side of the base end portion of the seat belt buckle 24. The middle winding spring portion 38 is disposed in the through recess 32 at a substantially center between the seat belt buckle 24 and the buckle anchor 30 and is disposed further forward than the upper winding spring portion 36. The lower winding spring portion 40 is disposed in the vicinity of the floor F of the vehicle body 2 and in the vicinity of the buckle anchor 30, and is disposed on the rear side of the upper winding spring portion 36 and the middle winding spring portion 38.
With such a configuration, when a load is applied from above, the seat belt buckle 24 can be rotated forward from the upper winding spring portion 36 with the upper winding spring portion 36 as the center, and the middle winding spring portion 38 is at the center. And can be rotated rearward of the middle winding spring portion 38 and can be rotated forward of the lower winding spring portion 40 around the lower winding spring portion 40. The upper winding spring portion 36, the middle winding spring portion 38, and the lower winding spring portion 40 are configured to return the winding spring portions to their original positions when the seat belt buckle 24 rotates about the respective winding spring portions. Generate energizing force.

Here, the thickness and length of the wire of the urging means 28, the number of turns and the diameter of each of the wrap spring portions 36, 38, 40, etc., each wrap spring portion 36, 38, 40 has a desired urging force. It is set appropriately so that it can be obtained. The urging force (spring force) of the upper winding spring part 36, the middle winding spring part 38, and the lower winding spring part 40 may all be set equal. Further, the urging force of each winding spring portion is set so that, for example, the middle winding spring portion 38 is larger than the upper winding spring portion 36 and the lower winding spring portion 40 is larger than the middle winding spring portion 38. Etc., each may have a different strength.
Furthermore, the upper coil spring part 36, the middle coil spring part 38, and the lower coil spring part 40 are arranged at positions overlapping each other in the width direction. That is, as shown in FIG. 4, the upper winding spring portion 36 is formed with a winding from the end portion directed upward to the right in the drawing. On the other hand, the middle winding spring portion 38 is wound from right to left, and the lower winding spring portion 40 is wound from right to left. Therefore, the biasing means 28 has a width dimension corresponding to almost one of the winding spring portions as a whole.

5 and 6 are side views showing the operation of the seat belt device 9 according to the first embodiment of the present invention. First, for example, an occupant sits on the upper surface (sitting surface) of the seat cushion 10 or a luggage L is placed on the upper surface of the seat cushion 10 as shown in FIG. The case where it is pushed from above by an object such as will be described. As shown in FIG. 5, when the luggage L is placed on the upper surface of the seat cushion 10 from above the seat belt buckle 24, the seat belt buckle 24 is pushed by the luggage L and resists the urging force generated in the urging means 28. On the other hand, it mainly rotates around the upper coil spring 36 and moves downward. Specifically, the connecting link members extending from both ends of each of the winding spring portions 36, 38, 40, that is, the angles formed by the wires (initial values are α ₁₀ , β ₁₀ , γ ₁₀ respectively, and the moved angles are α ₁₁ , respectively. , beta _11, the variation of gamma _{11 to) (Δα 1L = | α 10} -α 11 |, Δβ 1L = | β 10 -β 11 |, Δγ 1L = | γ 10 -γ 11 |) is, [Delta] [alpha] _1L > Δβ _1L , Δα _1L > Δγ _1L The seat belt buckle 24 is disposed in the storage recess 34 and is positioned at a storage position that is closer to the seat cushion 10 than the reference position. At this time, the upper winding spring portion 36 urges the seat belt buckle 24 toward the reference position in the rotation direction about the axis of the upper winding spring portion 36 so as to resist the load from above the luggage L. To do. At this time, the middle coil spring 38 and the lower coil spring 40 also generate a slight urging force according to a preset spring force. When the load L is removed, the seat belt buckle 24 returns to the reference position by the urging force of the upper winding spring portion 36, the middle winding spring portion 38, and the lower winding spring portion 40. That is, the seat belt buckle 24 can be moved by the urging means 24 between the reference position where the free end protrudes from the upper surface of the seat cushion 10 and the storage position stored in the storage recess 34.

Next, when the seat back 12 is tilted forward by the up-and-down moving mechanism 14 and the seat cushion 10 moves on the lower floor F along with the forward tilt, as shown in FIG. The seat belt buckle 24 is pushed by the front surface of the seat back 12 at the lower position where the 10 moves, and is positioned at the storage position where it is stored in the storage recess 34. At this time, the upper winding spring portion 36, the middle winding spring portion 38, and the lower winding spring portion 40 rotate about each to generate a biasing force. Here, the amount of change (Δβ _1θ = the angle between the connecting link members extending from both ends of the middle coil spring portion 38 and the lower coil spring portion 40, that is, the angles between the wires (the angles after movement are β ₁₂ and γ ₁₂ ). | Β ₁₀ −β ₁₂ |, _{Δγ 1θ} = | γ ₁₀ −γ ₁₂ |) _{satisfies Δγ 1θ} > _{Δγ 1L} and Δβ _1θ > Δβ _1L .
When the seat back 12 is raised and the seat cushion 10 is returned upward, the seat belt buckle 24 returns to the reference position by the urging force of the upper winding spring portion 36, the middle winding spring portion 38, and the lower winding spring portion 40.

According to the first embodiment as described above, the following effects can be obtained.
Since the urging means 28 for urging the seat belt buckle 24 is provided, the seat belt buckle can be used even when the luggage L is placed on the upper surface of the seat cushion 10 or the seat back 12 is tilted forward by the vertical movement mechanism 14. Since 24 is pushed by the seat back 12 and the luggage L and moves to the storage position, the loading of the luggage L and the movement of the downfold are not hindered. Further, when the luggage L is removed or the seat back 12 is returned to the original position, the seat belt buckle 24 returns to the reference position by the urging force of the urging means 28, so that the seat belt 22 can be easily moved to the seat belt buckle 24. Can be installed.

  When the rear seat 4 is in a normal posture, the seat belt buckle 24 is in the reference position, and the urging force of the urging means 28 does not work at this reference position. Durability can be improved. Further, since the free end of the seat belt buckle 24 protrudes from the upper surface of the seat cushion 10 without being biased by the biasing means 28 at the reference position, the seat belt 22 and the seat belt are used when the seat belt device 9 is used. When the buckle 24 is connected, the seat belt 22 is placed in the correct position. Accordingly, the safety of the seat belt device 9 can be ensured without impeding the operation of the seat belt device 9 as a safety device.

Even when the urging means 28 places the luggage L on the seat cushion 10, the seat belt buckle 24 can be moved to the storage position, so that the placement of the luggage L is not hindered. At this time, the urging means 28 urges the seat belt buckle 24 against the load from above, so that when the luggage L is removed, the seat belt buckle 24 can be returned to the reference position.
Even when the urging means 28 tilts the seat back 12 forward and moves the seat cushion 10 downward by the vertical movement mechanism 14, the seat belt buckle 24 can be moved to the storage position. This does not hinder the forward tilting action. Further, since the biasing means 28 biases the seat belt buckle 24 against the front surface of the seat back 12, when the seat back 12 is returned to the original position, the seat belt buckle 24 can be returned to the reference position. .

  Since the biasing means 28 includes the upper winding spring portion 36, the middle winding spring portion 38, and the lower winding spring portion 40, the movable range of the seat belt buckle 24 can be widened from various directions. It is possible to move flexibly to the storage position with respect to the load. Further, since the seat belt buckle 24 can be rotated rearward by the middle winding spring portion 38, the seat belt buckle 24 can be housed in the housing recess 34 more rearward, so that the size of the housing recess 34 can be reduced.

  Since the urging means 28 is formed by winding a predetermined portion of one wire to form a winding spring portion, the structure and manufacturing of the urging means 28 can be simplified. Further, since the winding spring portion is formed with the width direction of the vehicle body 2 as the axis, the dimension in the width direction of the vehicle body 2 can be reduced.

  Since the upper winding spring portion 36, the middle winding spring portion 38, and the lower winding spring portion 40 are formed so that their winding directions are staggered, they are arranged at positions overlapping each other in the width direction of the vehicle body 2. Accordingly, since the overall dimension of the biasing means 28 in the width direction can be made substantially the same as the width dimension of one of the winding spring portions 36, 38, 40, the biasing means 28 can be formed thin.

  Since the webbing 26 is provided, the seat belt buckle 24 does not extend any further. Therefore, the safety of the operation of the seat belt device 9 can be ensured. Further, even when the seat belt buckle 24 is pushed by placing the up / down moving mechanism 14 or the luggage L, the webbing 26 can sag, so that the movement of the seat belt buckle 24 is not hindered and the seat belt buckle 24 is surely placed in the storage position. Can be moved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The second embodiment has the same configuration as that of the first embodiment except that the shape of the urging means is different from that of the first embodiment.
FIG. 7 is a side view of the seat belt device 9 according to the second embodiment of the present invention. As shown in FIG. 7, the urging means 28 of the seatbelt device 9 is composed of a single wire, like the urging means 28 of the first embodiment, but has an intermediate winding spring portion 38. Not. Therefore, the urging means 28 according to the second embodiment has a configuration in which the upper winding spring portion 36 and the lower winding spring portion 40 are integrally connected by a wire.

  The upper winding spring portion 36 is disposed on the front side of the base end portion of the seat belt buckle 24, and is positioned at substantially the same height as the upper surface of the seat cushion 10 at the reference position of the seat belt buckle 24. The lower winding spring portion 40 is disposed in the vicinity of the buckle anchor 30.

In the seat belt device 9 having such a configuration, when the luggage L is placed on the seat cushion 10, the seat belt buckle 24 pivots downward about the upper winding spring portion 36 as in the first embodiment. To do. Here, since the upper winding spring portion 36 is disposed at a position higher than the bottom portion of the housing recess 34, the seat belt buckle 24 further pivots downward about the lower winding spring portion 40, as shown in FIG. As indicated by the alternate long and short dash line, it is immersed in the storage recess 34 and moved to the storage position moved downward from the reference position. At this time, the upper winding spring portion 36 and the lower winding spring portion 40 generate a biasing force that biases the seat belt buckle 24 in the rotational direction against the load L. At this time, the amount of change in the angle formed by the connecting link members at both ends of each of the winding spring portions 36 and 40, that is, the wires (initial values are α ₂₀ and γ ₂₀ respectively, and the moved angles are α ₂₁ and γ ₂₁ ). (Δα _2L = | α ₂₀ −α ₂₁ |, Δγ _2L = | γ ₂₀ −γ ₂₁ |) satisfies Δα _2L > Δγ _2L . When the luggage L is removed, the seat belt buckle 24 returns to the reference position by the urging force of the urging means 28.

FIG. 8 is a side view of the seat belt device 9 according to the second embodiment of the present invention. As shown in FIG. 8, when the seat back 12 is tilted forward and the seat cushion 10 is moved downward by the vertical movement mechanism 14, the seat belt buckle 24 is pushed by the seat back 12, and the storage recess 34 is located at the lower position. Move to. At this time, the upper winding spring portion 36 and the lower winding spring portion 40 generate a biasing force in the direction in which the seat belt buckle 24 pushes the seat back 12. At this time, the connecting link members at both ends of the lower coil spring unit 40, i.e., the amount of change in the angle formed between wires (angle and gamma ₂₂ after the _{movement) (Δγ 2θ = | γ 20} -γ 22 |) is, [Delta] [gamma] _2θ > Δγ _2L . When the seat back 12 is raised and the seat cushion 10 is moved upward, the seat belt buckle 24 returns to the reference position by the urging force of the urging means 28.

  According to the second embodiment as described above, the same effect can be obtained except for the effect of the first embodiment and the effect of providing the middle winding spring portion 38.

[Third embodiment]
Next, a third embodiment of the present invention will be described. The third embodiment has the same configuration as that of the first embodiment except that the shape of the biasing means is different from that of the first embodiment.
FIG. 9 is a side view of the seat belt device 9 according to the third embodiment of the present invention. As shown in FIG. 9, the urging means 28 is composed of a single wire, like the urging means 28 of the first embodiment, but does not have the upper winding spring portion 36. Therefore, the biasing means 28 according to the third embodiment has a configuration in which the middle winding spring portion 38 and the lower winding spring portion 40 are integrally connected by the wire.

When the seat belt buckle 24 is in the reference position, the middle winding spring portion 38 is located at substantially the same height as the bottom portion of the storage recess 34.
In the seat belt device 9 having such a configuration, when the luggage L is placed on the upper surface of the seat cushion 10, the seat belt buckle 24 is rotated forward mainly around the middle winding spring portion 38, As indicated by the dashed line 9 in FIG. At this time, the middle winding spring portion 38 and the lower winding spring portion 40 generate a biasing force that biases the seat belt buckle 24 toward the reference position. At this time, the amount of change (Δα) in the angle formed by the connecting link members of the winding spring portions 38, 40, that is, the wires (initial values are α ₃₀ and γ ₃₀ , respectively, and the moved angles are α ₃₁ and γ ₃₁ ). _3L = | α ₃₀ −α ₃₁ |, Δγ _3L = | γ ₃₀ −γ ₃₁ |), so that Δα _3L > Δγ _3L .

FIG. 10 is a diagram illustrating the operation of the seat belt device 9 according to the third embodiment. As shown in FIG. 10, when the seat back 12 is tilted forward and the seat cushion 10 is moved downward by the up-and-down moving mechanism 14, the seat belt buckle 24 is pushed by the seat back 12, and the storage recess 34 is located at the lower position. Move to. At this time, the middle winding spring portion 38 and the lower winding spring portion 40 generate a biasing force in a direction in which the seat belt buckle 24 pushes the seat back 12. At this time, the connecting link members of the lower coil spring unit 40, i.e., the amount of change in the angle formed between wires (angle and gamma ₃₂ after the _{movement) (Δγ 3θ = | γ 30} -γ 32 |) is, [Delta] [gamma] _3q> Δγ _3L . When the seat back 12 is raised and the seat cushion 10 is moved upward, the seat belt buckle 24 returns to the reference position by the urging force of the urging means 28.

  According to the third embodiment as described above, the same effect can be obtained except for the effect of the first embodiment and the effect of providing the middle winding spring portion 38.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the seat belt device of the third embodiment is used for a seat that does not have the vertical movement mechanism of the first embodiment.
FIG. 11 is a side view of the seat belt device 9 according to the fourth embodiment of the present invention. The seat belt device 9 of FIG. 11 has the same configuration as the seat belt device of the third embodiment.
The rear seat 4 does not have the vertical movement mechanism 14 of the first embodiment, but the left and right seat backs 12 each have a reclining mechanism that can be tilted forward or backward.
When the luggage L is placed on the upper surface of the seat cushion 10, the seat belt buckle 24 moves to the storage position as in the third embodiment.

  As shown in FIG. 11, when the seat back 12 is tilted forward, the seat belt buckle 24 is pushed against the front surface of the seat back 12 and moves downward. At this time, the seat belt buckle 24 may not be entirely disposed in the storage recess 34 depending on the range in which the seat back 12 can be tilted forward. However, the seat belt buckle 24 At least a part is housed in the housing recess 34 and is pushed by the seat back 12 to be stable. Therefore, in this embodiment, this position is the storage position of the seat belt buckle 24. The middle winding spring portion 38 and the lower winding spring portion 40 urge the seat belt buckle 24 toward the reference position against the seat back 12. When the seat back 12 is returned to the original position, the seat belt buckle 24 returns to the reference position by the urging force of the urging means 28.

  According to such a fourth embodiment, the same effect as the first embodiment can be obtained, and even when the seat back 12 is simply tilted forward, the seat belt buckle 24 can be moved to the storage position, When the seat back 12 is returned to the original position, it can be returned to the reference position.

  The present invention is not limited to the above-described embodiment. For example, the movement direction of the seat belt buckle is not limited to the vertical direction with respect to the upper surface of the seat cushion, and may be, for example, the front-rear direction with respect to the front surface of the seat back. . In this case, for example, a storage recess may be formed in the seat back, and the seat belt buckle may be configured to be movable between the storage recess and a predetermined position.

The biasing means of the first embodiment and the second embodiment may be used for the rear seat of the fourth embodiment.
The seat belt buckle is not limited to the one attached to the vehicle, and may be attached to a seat (a seat cushion or a seat back), for example.
The seat is not limited to the rear seat but may be a front seat.
The biasing means is not limited to one having a plurality of winding spring portions, and may be one in which one winding spring portion is formed. Furthermore, the urging means is not limited to one constituted by a winding spring portion made of a wire, and any configuration such as a leaf spring can be adopted.

1 is a perspective view showing a vehicle seat according to a first embodiment of the present invention. It is a side view showing a seat and a seat belt device concerning a first embodiment of the present invention. It is front sectional drawing seen along the III-III line of FIG. It is the sectional side view seen along the IV-IV line of FIG. It is a figure which shows operation | movement of the seatbelt apparatus of 1st embodiment of this invention. It is a figure which shows operation | movement of the seatbelt apparatus of 1st embodiment of this invention. It is a side view which shows the seatbelt apparatus which concerns on 2nd embodiment of this invention. It is a figure which shows operation | movement of the seatbelt apparatus of 2nd embodiment of this invention. It is a side view which shows the seatbelt apparatus which concerns on 3rd embodiment of this invention. It is a figure which shows operation | movement of the seatbelt apparatus which concerns on 3rd embodiment of this invention. It is a side view which shows the seatbelt apparatus which concerns on 4th embodiment of this invention.

Explanation of symbols

2 ... Vehicle 4 ... Rear seat 9 ... Seat belt device 10 ... Seat cushion 12 ... Seat back 14 ... Vertical movement mechanism 24 ... Seat belt buckle 26 ... Webbing 34 ... Storage recess 28 ... Energizing means 36 ... Upper winding spring part 38 ... Middle part Winding spring part 40 ... Lower winding spring part

Claims (8)

A vehicle seat belt device provided in a seat constituted by a seat cushion and a seat back,
Seat belts,
A seat belt buckle located at the rear portion of the seat cushion of the seat and attached to the seat or the vehicle body, wherein one end of the seat belt is detachably mounted;
The free end of the seat belt buckle is movable between a storage portion provided on the upper surface of the seat cushion or the front surface of the seat back and a predetermined position outside the storage portion, and the seat belt buckle is moved to the predetermined position. A biasing means for biasing toward
A vehicle seat belt apparatus comprising:   The seat back is installed so as to be able to lean forward toward the seat cushion centering on a hinge provided on the seat or the vehicle body, and the urging means is configured such that when the seat back leans forward, the seat belt buckle The vehicle seat belt device according to claim 1, wherein the vehicle seat belt device is urged against the front surface of the seat back.   3. The vehicle seat according to claim 1, wherein the urging means is configured to urge the seat belt buckle against the load when a load by an occupant or a load acts from above. Belt device.   The seat has a downward movement mechanism for moving the seat cushion downward when the seat back is tilted forward, and the biasing means is configured to move the seat cushion downward when the seat back is tilted forward. 4. The vehicle seat belt device according to claim 1, wherein the seat belt buckle is configured to move the seat belt buckle to the seat cushion storage portion and to urge against the front surface of the seat back. 5.   2. The urging means includes a winding spring portion having an upper end connected to a base end of the seat belt buckle, a lower end connected to the seat or the vehicle body, and an axis in a substantially width direction of the vehicle body. The vehicle seat belt device according to any one of claims 1 to 4.   The winding spring portion of the biasing means includes at least two first winding spring portions and a second winding spring portion that are connected in series to enable the seat belt buckle to move forward. The vehicle seat belt device according to claim 5, wherein the spring part and the second winding spring part are arranged so that at least a part of them overlaps along a substantially width direction of the vehicle body.   The winding spring portion of the urging means further includes a third winding spring portion that allows the seat belt buckle to move backward and is connected between the first winding spring portion and the second winding spring portion. The vehicle seat according to claim 6, wherein the first winding spring portion, the second winding spring portion, and the third winding spring portion are arranged so that at least a part of them overlaps along a substantially width direction of the vehicle body. Belt device.   And a webbing member that regulates a length between the seat belt buckle and a portion of the seat belt buckle attached to the seat or the vehicle body and allows the seat belt buckle to move by the biasing means. The vehicle seat belt device according to any one of claims 1 to 7.

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