JP2010285078A - Occupant restraint system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an occupant-restraint system for a vehicle which can control a positional gap of an holding belt for the waist of the person due to a tension acting on the holding belt for the trunk of the person. <P>SOLUTION: A four-point seat belt device 10 includes a pair of left and right shoulder belts 12L and 12R for holding the trunk of a sitting person P in a vehicle seat 11, a pair of left and right wrap belts 14L and 14R coupled to each other for holding the waist of the sitting person P, a tongue plate 26 lying between the shoulder belt 12L and the wrap belt 14L, and a buckle mechanism 25 having a buckle 28 and lying between the shoulder belt 12R and the wrap belt 14R. The seat belt device 10 further includes a belt movable coupling mechanism 30 for displacing the wrap belts 14L and 14R to below the seat with respect to the buckle mechanism 25 when a tension of a predetermined value or above acts on the shoulder belts 12L and 12R. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle occupant restraint device for restraining an occupant seated on a seat at the time of a collision to the seat.

  Seats with buckles and tongue plates provided between the pair of left and right shoulder webbings and the corresponding lap webbings, so that the left and right shoulder webbings and lap webbings can be attached to the seat occupant by combining these buckles and tongue plates A belt device is known (see, for example, Patent Document 1).

JP 2008-290698 A

  However, with the conventional techniques as described above, there is a concern that the lap belt may be lifted when a large tension is applied to the shoulder belt.

  An object of the present invention is to obtain a vehicle occupant restraint device that can suppress a positional shift of a waist restraint belt due to a tension acting on an upper body restraint belt.

  The vehicle occupant restraint device according to the first aspect of the present invention includes a pair of left and right upper body restraint belts for restraining an upper body of a seated occupant and a seat occupant restraint device connected to each other at a central portion in the seat width direction. A pair of left and right waist restraint belts for restraining the waist, one body restraint belt, a coupling portion interposed between the body restraint belt and the waist restraint belt on the left and right sides, and the other Belt coupling means having an upper body restraining belt and a coupled portion interposed between the waist restraining belt on the same side as the upper body restraining belt and capable of being coupled and uncoupled to the coupling portion; A belt that adjusts the relative position of the waist restraint belt with respect to the body restraint belt so that the waist restraint belt is separated from the body restraint belt when a tension greater than a predetermined value is applied to the body restraint belt. And a settling unit.

  In the vehicle occupant restraint device according to the first aspect, the pair of left and right upper body restraint belts and waist restraint belts are attached to the seated occupant by joining the joining portion to the joined portion. When a tension of a predetermined value or more is applied to the upper body restraining belt in this mounted state, the upper body restraining belt is displaced above the seat by the tension. At this time, in the vehicle occupant restraint device, the relative position of the waist restraint belt with respect to the body restraint belt is set such that the waist restraint belt is separated from the body restraint belt displaced upward by the belt adjusting means. Adjusted. That is, the displacement of the waist restraint belt to the upper side of the seat is suppressed or prevented.

  Thus, in the vehicle occupant restraint device according to the first aspect, it is possible to suppress the displacement of the waist restraint belt due to the tension acting on the upper body restraint belt.

  The vehicle occupant restraint device according to claim 2 is the vehicle occupant restraint device according to claim 1, wherein the belt adjusting means includes at least one of the upper body restraint belt and the waist restraint belt and the coupling portion. And at least one of the upper body restraining belt and the waist restraining belt and the coupled portion.

  In the vehicle occupant restraint device according to claim 2, belt adjusting means is provided between at least one of the coupling portion constituting the belt coupling means, the coupled portion and the body restraining belt corresponding to the left and right, and the waist restraining belt. It has been. For this reason, the position shift of the left and right waist restraint belts due to the tension acting on the pair of left and right upper body restraint belts can be suppressed. In addition, since the belt adjusting means is provided by using the connecting portion between the connecting portion and the connected portion and each belt, the structure is simpler than the configuration in which the belt adjusting means is provided on the upper body restraining belt, for example. It is.

  A vehicle occupant restraint device according to a third aspect of the present invention is the vehicle occupant restraint device according to the first or second aspect, wherein the belt adjustment means is such that the upper body restraint belt is displaced to the upper side of the seat. Accordingly, a displacement converting mechanism for displacing the waist restraint belt to the lower side of the seat with respect to the belt coupling means is included.

  In the vehicle occupant restraint device according to claim 3, when the upper body restraint belt is displaced to the upper side of the seat, the waist restraint belt is displaced to the lower side of the seat with respect to the belt coupling means by the displacement conversion mechanism of the belt adjusting means. Is done. As a result, even when the belt coupling means (coupled portion, coupled portion) is displaced upward along with the upper body restraining belt, the displacement of the waist restraining belt above the seat is prevented or effectively suppressed.

  A vehicle occupant restraint device according to a fourth aspect of the present invention is the vehicle occupant restraint device according to the third aspect, wherein the displacement conversion mechanism is rotatably supported by the coupling portion and is on one side with respect to the support portion. A first belt connecting member to which the upper body restraining belt is connected and the waist restraining belt is connected to the other side of the support portion, and is formed symmetrically with the first belt connecting member and is A second belt connecting member that is rotatably supported by the coupling portion, the upper body restraining belt is connected to one side with respect to the supporting portion, and the waist restraining belt is connected to the other side with respect to the supporting portion; It is configured to include.

  5. The vehicle occupant restraint device according to claim 4, wherein when the left and right upper body restraint belts are pulled above the seat, the first and second belt connecting members connected to one end side of the upper body restraint belts are joined portions. And rotated with respect to the coupled portion. Then, the waist restraint belt coupled to the opposite side of the coupling portion of the upper body restraint belt across the rotation axis with respect to the coupled portion and the coupled portion in the first and second belt coupling members is coupled to the coupled portion and the coupled portion. That is, it is displaced to the lower side of the seat with respect to the belt coupling means. Thus, in this vehicle occupant restraint device, the displacement conversion mechanism of the belt adjusting means is configured with a simple structure.

  A vehicle occupant restraint device according to a fifth aspect of the present invention is the vehicle occupant restraint device according to the first or second aspect, wherein the belt adjusting means is formed in an annular shape, and the coupling portion, the body restraint device A first flexible ring member to which the belt and the waist restraint belt are respectively coupled; and a second flexible ring member that is annularly formed and to which the coupled portion, the upper body restraint belt, and the waist restraint belt are coupled. And a flexible ring member.

  In the vehicle occupant restraint device according to claim 5, when the left and right upper body restraint belts are pulled upward of the seat, the first and second flexible ring members are deformed into an oval shape, so that The waist restraint belt is restrained from following the displacement of the body restraint belt upward. That is, the displacement of the waist restraint belt upward is prevented or effectively suppressed.

  As described above, the vehicle occupant restraint device according to the present invention has an excellent effect of being able to suppress the displacement of the waist restraint belt due to the tension acting on the upper body restraint belt.

It is a front view which shows the normal attitude | position in the principal part of the 4-point seat belt apparatus which concerns on the 1st Embodiment of this invention. It is a front view which shows the belt position adjustment attitude | position in the principal part of the 4-point seat belt apparatus which concerns on the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1. 1 is a perspective view showing a schematic overall configuration of a four-point seat belt device according to a first embodiment of the present invention. It is a front view which shows the normal attitude | position in the principal part of the 4-point seat belt apparatus which concerns on the 2nd Embodiment of this invention. FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. It is a front view which shows the normal attitude | position in the principal part of the 4-point seatbelt apparatus which concerns on the 3rd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 7. It is a front view which shows the normal attitude | position in the principal part of the 4-point seatbelt apparatus which concerns on the 4th Embodiment of this invention. FIG. 10 is a cross-sectional view taken along the line 10-10 in FIG. 9.

  A four-point seat belt device 10 as a vehicle occupant restraint device according to a first embodiment of the present invention will be described with reference to FIGS. First, a schematic overall configuration of the four-point seat belt device 10 will be described, and then the belt movable connecting mechanism 30 which is a main part of the present embodiment will be described in detail. In addition, arrow UP, arrow LH, and arrow RH which are appropriately described in each figure are the forward direction (traveling direction), the upward direction, and the left side when facing the traveling direction of the vehicle to which the four-point seat belt device 10 is applied, The right side (vehicle width direction) is shown, and these substantially coincide with the upper direction, the right side and the left side of the vehicle seat 11 to which the four-point seat belt device 10 is applied.

(Schematic overall configuration of the four-point seat belt device))
FIG. 4 is a schematic front view showing the use (occupant wearing) state of the four-point seat belt device 10 applied to the vehicle seat 11. As shown in FIG. 4, the four-point seat belt device 10 includes shoulder belts 12L and 12R as a pair of left and right upper body restraint belts, and lap belts 14L and 14R as a pair of left and right waist restraint belts. .

  One end sides of the shoulder belts 12L and 12R are wound around the retractors 16L and 16R, respectively, so that they can be pulled out. The retractors 16L and 16R are fixed to a seat back 18 constituting the vehicle seat 11 or a portion of the vehicle body located on the vehicle rear side of the seat back 18. In this embodiment, the retractors 16L and 16R are provided with a pretensioner mechanism for forcibly winding the shoulder belts 12L and 12R at the time of a frontal collision of an automobile to which the vehicle seat 11 is applied. One end side of each of the lap belts 14L and 14R is connected to the vehicle seat 11 (seat cushion 20) or the vehicle body via an anchor member or a retractor (not shown) on the outer side in the seat width direction with respect to the seat cushion 20, respectively.

  The other end of the shoulder belt 12L and the other end of the lap belt 14L are connected to the tongue assembly 22, respectively. The other end of the shoulder belt 12R and the other end of the lap belt 14R are connected to the buckle assembly 24, respectively. The tongue assembly 22 includes a tongue plate 26 as a coupling portion constituting a buckle mechanism 25 as a coupling means, a belt movable coupling mechanism 30 as a belt adjusting means and a displacement conversion mechanism, which will be described in detail later, and a cover 32 covering them. Is configured as the main part. The buckle assembly 24 is mainly composed of a buckle 28 as a coupled portion constituting the buckle mechanism 25, a belt movable connecting mechanism 30, and a cover 34 covering these. The buckle 28 is configured so that the tongue plate 26 can be coupled and decoupled.

  As described above, in the four-point seat belt device 10, the tongue plate 26 is coupled to the buckle 28 by the seat occupant P of the vehicle seat 11, so that the left and right lap belts 14L connected in series as shown in FIG. The pair of left and right shoulder belts 12L and 12R, which are mounted on the waist of the seated occupant P of the vehicle seat 11 by 14R, are mounted on the upper body of the seated occupant P.

(Configuration of belt movable connection mechanism)
In FIG. 1, the tongue assembly 22 and the buckle assembly 24 are shown in a front view. As shown in this figure, the belt movable connecting mechanism 30 constituting the tongue assembly 22 and the belt movable connecting mechanism 30 constituting the buckle assembly 24 are basically the same except for being connected to the tongue plate 26 or the buckle 28. It is configured symmetrically. Therefore, hereinafter, the belt movable coupling mechanism 30 of the tongue assembly 22 will be mainly described, and the description of the belt movable coupling mechanism 30 of the buckle assembly 24 will be omitted.

  As shown in FIG. 1, the belt movable connecting mechanism 30 has a belt fixing plate 38 connected to the tongue plate 26 via a pin 36 as a support shaft. The belt fixing plate 38 is formed in a substantially “L” shape when viewed from the front. In the vicinity of the bent portion 38A, the belt fixing plate 38 is rotated around the pin 36 with respect to the tongue plate 26 via the pin 36 as shown in FIG. Is rotatably supported. In this embodiment, the belt fixing plate 38 is provided on the seat occupant P side (vehicle rear side) with respect to the tongue plate 26.

  As shown in FIG. 3, the pin 36 has a head portion 36A formed at one end in the longitudinal direction and a crimped portion 36B with the other end crimped, so that the pin 36 is removed from the tongue plate 26 and the belt fixing plate 38. It is the structure by which it is prevented. In this embodiment, the pin 36 is fixed to the belt fixing plate 38 so as to rotate together with the belt fixing plate 38 with respect to the tongue plate 26 around its axis (fixing structure is not shown).

  The lower end of the shoulder belt 12L is connected (fixed) to the upper end portion 38B in the seat vertical direction, which is one end of the belt fixing plate 38. In addition, the other end of the belt fixing plate 38, that is, the outer end 38C in the sheet width direction opposite to the upper end 38B with respect to the pin 36 is connected (fixed) to the inner end in the sheet width direction of the lap belt 14L. )

  As a result, the belt fixing plate 38 has a normal posture in which the longitudinal direction of the tongue plate 26 (the coupling direction to the buckle 28) and the longitudinal direction of the lap belt 14L substantially coincide as shown in FIG. 1, and as shown in FIG. The belt position adjustment posture is such that the lap belt 14L is displaced downward in the seat vertical direction with respect to the tongue plate 26. That is, the belt fixing plate 38 is changed in posture from the normal posture to the belt position adjusting posture by rotating in the arrow A direction around the pin 36 with respect to the tongue plate 26.

  Further, as shown in FIGS. 1 and 2, the belt movable connecting mechanism 30 includes a stopper 40 that restricts the belt fixing plate 38 from rotating in the direction opposite to the arrow A direction from the normal posture. In this embodiment, the stopper 40 is provided on the belt fixing plate 38, and is engaged with the tongue plate 26 at an inner portion in the seat width direction on the upper side in the seat vertical direction with respect to the axis of the pin 36. It is supposed to fulfill its function. The stopper 40 is provided on the tongue plate 26 and engages with the belt fixing plate 38 at an inner portion in the seat width direction on the upper side in the seat vertical direction with respect to the axis of the pin 36, thereby achieving the above-described stopper function. It may be configured.

  Further, the belt movable connecting mechanism 30 has a return spring 42 as an urging member that biases the tongue plate 26 to the normal posture. The return spring 42 is a torsion coil spring in which a pin 36 is inserted into a coil portion 42A. One end 42B is locked to the tongue plate 26 and the other end 42C is a belt 36 via a head 36A (the pin 36A). It is locked to a fixed plate 38).

  In the belt movable coupling mechanism 30, the belt fixing plate 38 is biased to the normal position with respect to the tongue plate 26 by the tongue plate 26 being pressed against the stopper 40 by the urging force of the return spring 42. That is, in the four-point seat belt device 10, the tongue plate 26 and the buckle 28 are held in the normal posture by the urging force of the return spring 42 in the normal use state, and the belt fixing plate 38 The belt 42 is adjusted to rotate in the direction of arrow A against the urging force of the spring 42 to reach the belt position adjustment posture.

  In this embodiment, as shown in FIG. 3, a collar 44 is disposed between the coil portion 42 </ b> A of the return spring 42 and the pin 36, and a spacer 46 is disposed between the tongue plate 26 and the belt fixing plate 38. The belt fixing plate 38 is smoothly rotated with respect to the tongue plate 26. In this embodiment, one of the belt fixing plate 38 of the tongue assembly 22 and the belt fixing plate 38 of the buckle assembly 24 corresponds to the first belt connecting member in the present invention, and the other corresponds to the second belt connecting member.

  The cover 32 of the tongue assembly 22 has a portion of the tongue assembly 22 excluding a portion where the belt movable coupling mechanism 30 and the tongue plate 26 are coupled to the buckle 28, mainly from the front and rear in the front-rear direction of the seat and from the upper and lower sides in the vertical direction of the seat. Covering. Although not shown, the cover 32 is fixed to the tongue plate 26. For this reason, the tongue assembly 22 is configured such that a portion (part) that is relatively displaced with respect to the tongue plate 26 is not exposed to the outside (particularly the occupant P side) in a normal posture.

  The cover 34 of the buckle assembly 24 mainly includes a portion of the buckle assembly 24 excluding a portion where the belt movable coupling mechanism 30 and the buckle 28 are coupled to the tongue plate 26, mainly from the front and rear in the seat front-rear direction and from the top and bottom in the seat vertical direction Covering. Although not shown, the cover 34 is fixed to the buckle 28. For this reason, the buckle assembly 24 is configured such that a portion (part) that is relatively displaced with respect to the buckle 28 is not exposed to the outside (particularly the occupant P side) in a normal posture.

  Further, the cover 34 has an extending portion 48 extending from the wall portion 34A on the seated occupant P side toward the buckle 28 side. The extending portion 48 extends beyond the buckle 28 and is configured to cover a portion of the cover 32 from the seated occupant P side in a state where the tongue plate 26 is coupled to the buckle 28 as shown in FIG. 3. The extending portion 48 is configured so that a portion of the left and right belt fixing plates 38 that are close to each other when the posture is changed to the belt position adjusting posture (the lower portion in the seat vertical direction with respect to the pin 36 and the inner portion in the seat width direction) is seated. It is formed so as to cover from the side. Thus, the four-point seat belt device 10 is configured to prevent the clothing of the seated occupant P from being sandwiched between the belt fixing plates 38 whose posture is changed to the belt position adjustment posture.

  Next, the operation of the first embodiment will be described.

  In the four-point seat belt apparatus 10 configured as described above, when the seated occupant P of the vehicle seat 11 pulls the shoulder belts 12L, 12R from the retractors 16L, 16R and locks the tongue plate 26 to the buckle 28, the model is shown in FIG. As shown, the pair of left and right shoulder belts 12L and 12R are parallel to restrain the upper body of the seat occupant P of the vehicle seat 11, and the lap belts 14L and 14R that are integrated in series on the left and right are seated occupants. Restrain P's waist.

  In the event of a frontal collision of the automobile on which the vehicle seat 11 is mounted, the pretensioner mechanisms of the retractors 16L and 16R are operated, and the shoulder belts 12L and 12R are brought into close contact with the upper body of the seated occupant P. Then, the movement of the seated occupant P forward of the seat relative to the vehicle seat 11 due to inertia is suppressed by the restraint by the shoulder belts 12L and 12R and the lap belts 14L and 14R.

  At this time, the shoulder belts 12 </ b> L and 12 </ b> R are subjected to a tension greater than a predetermined value, and the lower ends thereof move upward in the seat vertical direction. Then, in the belt movable connecting mechanism 30 of the tongue assembly 22 and the buckle assembly 24, each belt fixing plate 38 rotates in the direction of the arrow A against the urging force of the return spring 42. As a result, the belt fixing plate 38 shifts from the normal posture to the belt position adjusting posture, and the lap belts 14L and 14R are prevented or effectively suppressed from moving upward.

  Therefore, in the four-point seat belt device 10, tension is applied to the shoulder belts 12L and 12R in accordance with the operation of the pretensioner or the relative displacement of the seat occupant P with respect to the vehicle seat 11, and the shoulder belts 12L and 12R (tang plates) 26, when the buckle 28) is moved to the upper side of the seat, the lap belts 14L and 14R are restrained from rising upward following the movement of the buckle 28). As a result, the lap belts 14L and 14R are maintained in an appropriate state of being attached to the seated occupant P, which contributes to improvement of occupant protection performance by the four-point seat belt device 10.

  In particular, in the four-point seat belt device 10, the belt that converts the upward movement of the shoulder belts 12L and 12R into the downward movement of the seat with respect to the tongue plate 26 and the buckle 28 (buckle mechanism 25) of the lap belts 14L and 14R. Since the movable connecting mechanism 30 is provided, the lap belts 14L and 14R are prevented or effectively prevented from rising upward when moved to the upper side of the seat as described above.

  Further, in the four-point seat belt device 10, since the belt movable connecting mechanism 30 is provided between the shoulder belt 12L and the tongue plate 26, and between the shoulder belt 12R and the buckle 28, for example, the shoulder belt 12L, Compared with the structure etc. which divide 12R up and down and provide a belt adjustment means, it is possible to suppress the lap belts 14L and 14R from rising with a simple structure.

  In the four-point seat belt device 10, the belt movable connecting mechanism 30 is provided between the shoulder belt 12L and the lap belt 14L and the tongue plate 26, and between the shoulder belt 12R and the lap belt 14R and the buckle 28, respectively. As described above, the configuration in which the lap belts 14L and 14R are moved downward with respect to the buckle mechanism 25 as the shoulder belts 12L and 12R move upward can be obtained with a simple configuration. More specifically, the belt fixing plate 38 to which the shoulder belt and the lap belt are coupled rotates with respect to the tongue plate 26 and the buckle 28 in the direction of the arrow A around the pin 36, so that the normal position is changed to the belt position adjusting position. Since the structure is switched, the upward movement of the shoulder belt 12L and the shoulder belt 12R of the shoulder belt 12L and the shoulder belt 12R can be converted into the downward movement of the lap belts 14L and 14R with respect to the buckle mechanism 25.

  Furthermore, in the four-point seat belt device 10, the tongue assembly 22 and the buckle assembly 24 are configured to have covers 32 and 34 that cover the belt movable coupling mechanism 30, so that the shoulder belts 12 </ b> L and 12 </ b> R are attached to the seated occupant P. In addition, it is possible to give a good wearing feeling of the lap belts 14L and 14R. Further, in the four-point seat belt device 10, since the extending portion 48 is formed in the cover 34, the clothes of the seated occupant P are sandwiched between the pair of belt fixing plates 38 that move to the respective belt position adjustment postures. Is prevented.

(Other embodiments)
Next, another embodiment of the present invention will be described. Parts and portions that are basically the same as those in the first embodiment or the previous configuration are denoted by the same reference numerals as those in the first embodiment or the previous configuration, and are not described or illustrated. There is.

(Second Embodiment)
FIG. 5 is a front view in which a main part of a four-point seat belt device 50 according to the second embodiment of the present invention is partially cut away. FIG. A cross-sectional view along line 6 is shown. As shown in these drawings, the four-point seat belt device 50 includes a tongue assembly 52 and a buckle assembly 54 instead of the tongue assembly 22 and the buckle assembly 24. Different from the point type seat belt device 10. The tongue assembly 52 and the buckle assembly 54 are basically configured symmetrically except that either the tongue plate 26 or the buckle 28 is connected to the shoulder belts 12L, 12R and the lap belts 14L, 14R. Therefore, hereinafter, the tongue assembly 52 will be mainly described, and the description of the buckle assembly 54 will be omitted.

  The tongue assembly 52 has a wire ring 56 as a first flexible ring member that constitutes a belt position adjusting means. The wire ring 56 is fixed by overlapping both ends of the wire to form a ring shape, and a fixing piece 58 provided on the tongue plate 26 is wound around and fixed to the double portion of the wire ring 56. .

  The wiring 56 is connected to the other end of the shoulder belt 12L and the lap belt 14L. If this point is supplemented, the other end of the shoulder belt 12L and the lap belt 14L is formed with an annular portion 60 formed by folding and sewing, and a wire ring 56 (a wire constituting the annular portion 60). Is inserted, the other ends of the shoulder belt 12L and the lap belt 14L are coupled to the wire ring 56.

  Further, the tongue assembly 52 has a covering portion 62 that covers the wiring 56. The covering portion 62 is made of, for example, a flexible (soft) material such as synthetic rubber, and covers the wire ring 56 from the outer peripheral side, and also includes a shoulder belt 12L, a lap belt 14L (each annular portion 60) connected to the wire ring 56, and The fixing piece 58 (a part of the tongue plate 26 on the fixing piece 58 side) is covered. In this embodiment, the annular portion 60 is covered by the covering portion 62 in a close contact state from the inner peripheral side of the wire ring 56 and is not contacted from the outer peripheral side of the wire ring 56. As a result, the shoulder belt 12L and the lap belt 14L are held at predetermined positions in the circumferential direction with respect to the wire ring 56, can be easily changed in posture in the thickness direction, and the sewing portion S of the annular portion 60 is not exposed to the outside. It is said that. The fixed piece 58 is covered in close contact from the inner and outer peripheral sides of the wire ring 56.

  Supplementing the buckle assembly 54, in the buckle assembly 54, a part of the buckle 28 on the fixing piece 58 side is covered (embedded) in close contact with the covering portion 62 together with the fixing piece 58, and the buckle 28 is wired. 56 is firmly held. In this embodiment, one of the wire ring 56 of the tongue assembly 52 and the wire ring 56 of the buckle assembly 54 corresponds to the first flexible ring member in the present invention, and the other corresponds to the second flexible ring member. Other configurations of the four-point seat belt device 50 are the same as the corresponding configurations of the four-point seat belt device 10.

  The operation and effect of the four-point seat belt device 50 will be described mainly with respect to differences from the operation and effect of the four-point seat belt device 10.

  In the four-point seat belt device 50 configured as described above, the lower end portions of the shoulder belts 12L and 12R are moved upward in the seat vertical direction by a tension equal to or greater than a predetermined value at the time of a frontal collision of an automobile to which the vehicle seat 11 is applied. Then, the wire ring 56 is deformed into a long oval shape together with the covering portion 62 in the sheet vertical direction. For this reason, it is suppressed that the lap belts 14L and 14R follow the upward displacement of the lower end portions of the shoulder belts 12L and 12R.

  As described above, in the four-point seat belt device 50 according to the second embodiment, the lap belts 14L and 14R slide up above the seat at the time of a frontal collision of the automobile to which the vehicle seat 11 is applied. Is suppressed.

  Further, in the four-point seat belt device 50, the belt position adjusting means is composed mainly of the flexible wire ring 56 and the covering portion 62, so that the shoulder belts 12L, 12R and the lap belt 14L, 14R can give a better feeling of wearing and a sense of security at the time of wearing. Further, when the occupant P is restrained by the shoulder belts 12L and 12R and the lap belts 14L and 14R, the soft part comes into contact with the seated occupant P, so that the tongue assembly 52 and the buckle assembly 54 come into contact with the abdomen of the occupant with a soft feeling. Good occupant protection performance can be obtained.

  Further, in the four-point seat belt device 50, since the sewing portion S of the annular portion 60 is covered with the covering portion 62, the appearance is good.

  In the second embodiment, an example in which the covering portion 62 is formed in an annular shape covering the wiring 56 along the wiring 56 has been described. However, the present invention is not limited to this, and for example, the covering portion 62 is wired. It is good also as a structure which fills the space of 56 inner peripheral sides.

(Third embodiment)
FIG. 7 is a front view in which a main part of a four-point seat belt device 70 according to the third embodiment of the present invention is partly cut away. As shown in this figure, the four-point seat belt device 70 includes a tongue assembly 72 and a buckle assembly 74 instead of the tongue assembly 52 and the buckle assembly 54. This is different from the type seat belt device 50. The tongue assembly 72 and the buckle assembly 74 are basically symmetrical with each other except that either the tongue plate 26 or the buckle 28 is connected to the shoulder belts 12L, 12R and the lap belts 14L, 14R. Therefore, hereinafter, the tongue assembly 72 will be mainly described, and the description of the buckle assembly 74 will be omitted.

  In the tongue assembly 72, instead of the annular covering portion 62, a covering portion 76 that covers the connecting portion between the tongue plate 26 (fixed piece 58) and the wire ring 56, and the annular portion 60 of the shoulder belt 12L and the annular portion of the lap belt 14L. And a stopper portion 78 provided between the portion 60. The covering portion 76 is made of a flexible (soft) material such as synthetic rubber, and covers a fixed piece 58 wound around the wire ring 56 and a part of the tongue plate 26.

  The stopper portion 78 is made of synthetic rubber, resin, or the like, and is fixed between the annular portion 60 of the shoulder belt 12L and the annular portion 60 of the lap belt 14L in the wiring 56. As shown in FIG. 8, the stopper portion 78 is formed in a size and shape that cannot pass through the annular portion 60. As a result, the four-point seat belt device 70 is configured such that the shoulder belt 12L and the lap belt 14L are regulated (restricted) by the stopper portion 78. That is, in the four-point seat belt device 70, the interference between the shoulder belt 12L and the lap belt 14L is prevented or suppressed. Other configurations of the four-point seat belt device 70 are the same as the corresponding configurations of the four-point seat belt device 50.

  Therefore, also in the four-point seat belt device 70 according to the third embodiment, the second embodiment is basically the same except for the operational effect of the sewing portion S of the annular portion 60 being covered by the covering portion 62. The same effect can be obtained by the same operation as that of the four-point seat belt device 50 according to the embodiment.

(Fourth embodiment)
FIG. 9 is a front view in which a main part of a four-point seat belt device 80 according to the fourth embodiment of the present invention is partially cut away. As shown in this figure, the four-point seat belt device 80 is provided with a tongue assembly 82 and a buckle assembly 84 instead of the tongue assembly 72 and the buckle assembly 74. This is different from the type seat belt device 70. The tongue assembly 82 and the buckle assembly 84 are basically symmetrical with each other except that either the tongue plate 26 or the buckle 28 is connected to the shoulder belts 12L, 12R and the lap belts 14L, 14R. Therefore, hereinafter, the tongue assembly 82 will be mainly described, and the description of the buckle assembly 84 will be omitted.

  The tongue assembly 82 has a belt cover (cap) 86 that individually covers the lower end portion including the annular portions 60 of the shoulder belt 12L and the lap belt 14L instead of the stopper portion 78. Each belt cover 86 is made of a resin material or the like, and is configured to have high rigidity with respect to the bending rigidity of the wire ring 56. Each belt cover 86 is held by the wire ring 56 by inserting the wire ring 56, and is configured to be difficult to be displaced in the longitudinal direction of the wire ring 56 with respect to the relatively low-rigidity wire ring 56. Each belt cover 86 may be fixed to the wire ring 56.

  As described above, in the four-point seat belt device 80, the shoulder belt 12 </ b> L and the lap belt 14 </ b> L are configured to be restricted (restricted) by the belt covers 86. That is, in the four-point seat belt device 80, interference between the shoulder belt 12L and the lap belt 14L is prevented or suppressed. Further, as shown in FIG. 10, the belt cover 86 according to this embodiment covers the sewing portion S of the annular portion 60 in a non-contact manner. Other configurations of the four-point seat belt device 80 are the same as the corresponding configurations of the four-point seat belt device 70.

  Therefore, even with the four-point seat belt device 80 according to the fourth embodiment, the same effect can be obtained basically by the same operation as the four-point seat belt device 50 according to the third embodiment. In the four-point seat belt device 80, the sewing portion S of the annular portion 60 is covered with the belt cover 86, so that the appearance is good.

  In the above-described embodiment, an example in which the present invention is applied to the four-point seat belt devices 10, 50, 70, and 80 has been described. However, the present invention is not limited thereto, and, for example, the shoulder belts 12L and 12R. The present invention may be applied to a four-point type air belt apparatus in which the lap belts 14L and 14R are provided with an inflating portion (air belt) that is inflated and deployed by gas supply.

  In addition, it goes without saying that the embodiment of the present invention is not limited to the above-described embodiments and modifications, and can be implemented with various modifications.

10 4-point seat belt device (vehicle occupant restraint device)
11 Vehicle seat (seat)
12L / 12R Shoulder belt 14L / 14R Lap belt 26 Tang plate (joint)
28 Buckle (joined part)
30 Belt movable connection mechanism (displacement conversion mechanism, belt adjustment means)
38 Belt fixing plate (first belt connecting member, second belt connecting member)
50, 70, 80 Four-point seat belt device 56 Wiring (first flexible ring member, second flexible ring member)

Claims (5)

A pair of left and right upper body restraint belts for restraining the upper body of a seated occupant;
A pair of left and right waist restraint belts that are connected to each other at the center in the seat width direction and restrain the waist of the seated occupant;
One body restraint belt and a coupling portion interposed between the waist restraint belt on the same side as the body restraint belt, and the other body restraint belt and the same side of the body restraint belt. A belt coupling means having a coupled portion that is interposed between the waist restraining belt and coupled to and decoupled from the coupling portion;
The relative position of the waist restraint belt with respect to the body restraint belt is adjusted so that the waist restraint belt is separated from the body restraint belt when a tension greater than a predetermined value is applied to the body restraint belt. Belt adjusting means;
An occupant restraint device for vehicles.   The belt adjusting means is provided between at least one of the upper body restraining belt and the waist restraint belt and the coupling part, and between at least one of the upper body restraining belt and the waist restraint belt and the joined part. The vehicle occupant restraint device according to claim 1, which is provided respectively on the vehicle.   The belt adjustment means includes a displacement conversion mechanism for displacing the waist restraint belt relative to the belt coupling means toward the seat lower side as the upper body restraint belt is displaced toward the seat upper side. The vehicle occupant restraint device according to claim 2. The displacement conversion mechanism is
A first belt coupling member rotatably supported by the coupling portion, the upper body restraint belt being coupled to one side relative to the support portion, and the waist restraint belt being coupled to the other side relative to the support portion;
It is formed symmetrically with the first belt connecting member and is rotatably supported by the coupled portion, and the upper body restraining belt is connected to one side with respect to the supporting portion and on the other side with respect to the supporting portion. A second belt connecting member to which the waist restraint belt is connected;
The vehicle occupant restraint device according to claim 3, comprising: The belt adjusting means is
A first flexible ring member formed in an annular shape, to which the coupling portion, the upper body restraint belt, and the waist restraint belt are respectively coupled;
A second flexible ring member formed in an annular shape, to which the coupled portion, the upper body restraint belt, and the waist restraint belt are respectively coupled;
The occupant restraint device for a vehicle according to claim 1 or 2, comprising the vehicle.

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