JP2010228720A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device capable of enhancing operability in which insertion of a tongue plate to a buckle is practicable by one hand operation. <P>SOLUTION: The seat belt device 10 includes: a webbing portion 29ab constituting a wrap belt portion extending to the buckle 12; and a band body 30 extending in parallel to the webbing portion and supporting the webbing portion while becoming independent in the seat belt non-attachment state. The band body 30 can be bent in a direction approaching from an independent position of the band body to a sitting occupant and cannot be bent in an opposite direction to a direction approaching from the independent position of the band body to the sitting occupant. The band body 30 includes a plurality of rigid band body pieces 32 turnably connected to each other. When the tongue plate 14 is inserted to the buckle 12, the band body 30 is not moved from the independent position to a tongue plate insertion direction and generates reaction force. Accordingly, the tongue plate 14 can be inserted to the buckle 12 by one hand operation and operability is enhanced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In the present invention, the belt body through which the webbing connected to the buckle is inserted when the seat belt is not attached takes a self-supporting posture, and the belt body generates a reaction force when the tongue plate is inserted into the buckle, and the buckle is pushed by the tongue plate. The present invention relates to a seatbelt device that can be restricted from moving in the direction in which the tongue plate is inserted, and as a result, can be inserted into the buckle of the tongue plate with a single hand and improved in operability.

  Patent Document 1 is a self-supporting buckle provided with a leaf spring-shaped support member on the buckle side belt, and this support member bends relatively easily to the occupant side, but is difficult to bend to the opposite side of the occupant. A seat belt device having improved tongue plate insertion into a self-supporting buckle is disclosed.

Japanese Patent Laid-Open No. 10-44929

However, the apparatus of Patent Document 1 has the following problems.
(B) Since the support member is an elastic material and not a rigid body, the support member is deformed in the tongue plate insertion direction when the tongue plate is inserted into the buckle, and it is difficult to insert the tongue plate into the buckle by the amount of movement of the buckle due to the deformation. Become.
For example, when a self-supporting buckle supported by a support member made of an elastic material of Patent Document 1 is applied to a buckle side lap belt of a four-point seat belt device, when the tongue plate is inserted into the buckle, the buckle is inserted into the tongue plate. In order to displace in the direction, the tongue plate and the buckle must be operated with the left and right hands, requiring both-hand operation.
(B) Since the support member is always biased in the direction of the buckle self-supporting position, a biasing force is applied in the direction of separating the belt from the occupant even when the belt is worn, and the lap belt is separated from the occupant and gives a feeling of discomfort to the wearing. there is a possibility.

  An object of the present invention is to provide a seat belt device that can restrict the movement of the buckle in the tongue plate insertion direction when the tongue plate is inserted into the buckle, can be inserted into the buckle of the tongue plate with one hand, and can improve operability. It is to provide.

  The seat belt device of the present invention that solves the above problems or achieves the above object is as follows.

(1) A seat belt device according to the present invention includes a webbing portion constituting a lap belt portion extending from a belt guide to a buckle, and a belt that extends in parallel with the webbing portion and is self-supported in a state in which no seat belt is attached. A seat belt device having a body.
The belt body can be bent in a direction approaching the seated occupant from the self-supporting position of the belt body, and cannot be bent in a direction opposite to the direction approaching the seated occupant from the self-supporting position of the belt body.

(2) The seat belt device according to (1) above,
A buckle and a tongue plate detachable from the buckle;
Left and right webbings including a buckle side webbing and a tongue plate side webbing slidable on the buckle and the tongue plate, respectively
The band extending in parallel with the buckle webbing;
A retractor coupled to an end of the webbing;
It consists of a four-point seat belt device provided with.

(3) In the seat belt device according to (1) or (2), the band includes a plurality of rigid band pieces that are rotatably connected to each other.

(4) In the seat belt device according to any one of the above (1) to (3), the belt body is formed on the belt outer surface on the side opposite to the side in contact with the occupant in the longitudinal direction of the belt body. Two surfaces extending in a direction substantially perpendicular to the longitudinal direction of the belt body that have a continuous portion and are opposed to the longitudinal direction of the belt body across the discontinuous portion are in contact with the longitudinal direction of the belt body at the discontinuous portion. And can be separated.

(5) In the seat belt device according to (3), the band has a connecting point that rotatably connects adjacent band pieces to the side surface of the band in contact with the occupant. Have

(6) In the seat belt device according to any one of the above (1) to (5), when the belt body is in a self-supporting position with the seat belt not attached, the buckle is above the upper surface of the seat cushion. The belt is bent and the base direction of the belt body is set so that it is located on the seat center side in the vehicle width direction from the side surface of the belt and the buckle is tilted toward the seat center side in the vehicle width direction from vertically above. ing.

(7) In the seatbelt device according to any one of (1) to (6), a stopper is provided for restricting the belt body from falling backward from the self-supporting position with respect to the base of the belt body. ing.

  According to the seat belt device of the above (1), since the belt body cannot be bent in the direction opposite to the direction approaching the seated occupant from the self-standing position of the belt body, when the tongue plate is inserted into the buckle, When the tongue plate insertion force is applied in a direction opposite to the direction approaching the seated occupant from the self-supporting position, the belt does not move from the self-supporting position in the tongue plate insertion direction, and a reaction force is generated. Therefore, without supporting the buckle, the tongue plate can be inserted into the buckle with one hand operation (the hand holding the tongue plate) (there is no need to hold the buckle with the other hand), improving operability. . Further, since the belt body can be bent in the direction approaching the seated occupant from the self-standing position of the belt body, the belt body can fit (adhere) to the waist of the seated occupant when the seat belt is worn.

  According to the seat belt device of the above (2), in the four-point seat belt device, the left and right webbings are provided and the retractor is connected to the end of the webbing. When released, the web automatically engages the waist of the seated occupant by the webbing involved by the retractor, and the connecting portion between the tongue plate and the buckle automatically comes to the front of the occupant waist. As a result, operability is improved.

According to the seat belt device of the above (3), since the belt body includes a plurality of rigid band body pieces that are rotatably connected to each other, the belt body in the self-standing position is not deformed in the tongue plate insertion direction, Maintains a self-supporting posture and generates a reaction force in the opposite direction to the tongue plate insertion direction.
In addition, since the belt body is composed of a rigid body connecting body, the spring biasing force in the direction of separating the belt body from the waist by the elastic material support member as described in Patent Document 1 is applied to the belt body when the belt is mounted. The lap belt can be brought into close contact with the occupant to ensure occupant restraint.

  According to the seat belt device of the above (4), the band has a discontinuous portion in the longitudinal direction of the band on the outer side surface of the band opposite to the side in contact with the occupant. Since it can be contacted and separated in the longitudinal direction of the body, the belt discontinuity part is separated when the belt is worn, and the belt body is fitted to the occupant's waist, and when the belt is not worn, the webbing tension by the retractor Accordingly, the surfaces facing each other across the discontinuous portion are close to each other and come into contact with each other, and after that, the belt body behaves as a rigid body, so that a reaction force at the time of inserting the tongue plate can be obtained.

  According to the seat belt device of the above (5), the belt body has a connection point for rotatably connecting the adjacent pieces to the side surface of the belt body on the side in contact with the occupant. By the tension of the webbing by the retractor, a moment in the direction of taking a self-supporting posture acts on the connecting rotation point, and the belt body maintains the self-supporting posture.

  According to the seat belt device of the above (6), when the belt is in the self-supporting position with the seat belt not attached, the buckle is positioned above the upper surface of the seat cushion and at the center of the seat in the vehicle width direction from the side surface of the seat cushion. Therefore, the movement distance of the tongue plate to the buckle when the belt is attached is reduced compared with the case where the belt body and the buckle are directed vertically upward, and the operability of the tongue plate for inserting the tongue plate into the buckle is reduced. Becomes better. Moreover, since the extending direction of the buckle is inclined toward the seat center side in the vehicle width direction from the vertically upward direction, the tongue plate can be easily inserted into the buckle. Moreover, if the belt is provided on the center side in the vehicle width direction of the seat (opposite to the passenger getting on and off), the belt at the self-standing position does not interfere with the passenger getting on and off, and does not interfere with getting on and off.

  According to the seat belt device of the above (7), since the stopper that restricts the belt body from falling backward from the autonomous position is provided on the base of the belt body, the buckle moves backward excessively. This can be prevented, and the tongue plate can be easily inserted into the buckle. In particular, in the case of a four-point seat belt device, the tension of the shoulder belt acts in the direction of moving the buckle rearward, so that the buckle moves rearward to the side of the seatback and the insertability of the tongue plate into the buckle is poor. However, in the present invention, since the buckle can be prevented from moving excessively backward, the tongue plate can be easily coupled to the buckle.

1 is a front view of a seat belt device according to an embodiment of the present invention in a seat belt wearing state. It is the side view seen from the belt body side of the seatbelt apparatus of FIG. FIG. 2 is a side view of the seat belt device of FIG. 1 as viewed from the side opposite to the belt body. 1 is a front view of the seat belt device in a state where the seat belt is not worn. FIG. 5 is a side view of the seat belt device of FIG. 4 as viewed from the band side. FIG. 5 is a side view of the seat belt device of FIG. 4 as viewed from the side opposite to the belt body. FIG. 2 is a schematic enlarged front view of a buckle and a belt body of the seat belt device of FIG. 1. FIG. 8 is an exploded enlarged cross-sectional view (viewed in a plan view direction) of a connecting portion of the belt body of the seat belt device of FIG. 7. FIG. 9 is an enlarged side view of a connecting portion of a belt body of the seat belt device of FIG. 8. FIG. 9 is a cross-sectional view (viewed from a plan view direction) of a connecting portion of the band body of FIG. 8 in a state where adjacent band body pieces are coupled. It is a side view in the seatbelt wearing state of the connection part of the strip | belt body of FIG. It is a side view in the belt body self-supporting state of the connecting part of the belt body of FIG. FIG. 2 is an enlarged front view of a buckle, a band piece connected to the buckle, and a webbing in the seat belt device of FIG. 1. FIG. 2 is a side view of the base portion of the belt body in the seat belt apparatus of FIG. 1 in a seat belt wearing state. FIG. 2 is a side view of the base of the belt body in the seat belt device of FIG. 1 in a state where the seat belt is not attached.

Below, the seatbelt apparatus of one Example of this invention is demonstrated with reference to FIGS.
In the figure, FR indicates the front in the vehicle front-rear direction, and OUT indicates the vehicle width direction outer side.

The seat belt device 10 of the present invention is a four-point seat belt device. As shown in FIGS. 1 to 7 and 13, the seat belt device 10 of the present invention is attached to and detached from the left and right shoulder belts 24 extending vertically without crossing in front of the occupant's chest in the seat belt wearing state. And a lap belt 22 connected to the tongue plate 14.
The shoulder belt 24 and the lap belt 22 are connected to each other.

  FIG. 13 shows a case where the shoulder belt 24 and the lap belt 22 are composed of the same webbing 20. That is, the webbing 20 includes a webbing 20a for a lap belt 22 and a webbing 20b for a shoulder belt. The lap belt webbing 20a includes a buckle side webbing 20ab and a tongue plate side webbing 20at which are different from each other.

  However, instead of the webbing structure shown in FIG. 13, the webbing 20a for the lap belt 22 and the webbing 20b for the shoulder belt 18 are formed of different webbings, and the webbing 20a for the lap belt 22 is placed in the immediate vicinity of the buckle 12 or the tongue plate 14. Thus, the webbing 20b for the shoulder belt 18 may be connected by sewing or the like.

In the example of FIG. 13, the lap belt webbing 20 a and the shoulder belt webbing 20 b change directions at the slit 32 c at one end of the webbing passage 32 b formed in the belt piece 32 connected to the buckle 12 or the buckle 12. (FIG. 13).
On the tongue plate 14 side, a slit 32c corresponding to the slit 32c of the band piece 32 on the buckle 12 side is formed in the tongue plate 14, and the webbing 20 is slidably passed therethrough, and the lap belt webbing 20a and the shoulder belt webbing 20b. The direction may be changed by the slit portion 32c (FIG. 13). Alternatively, on the tongue plate side, similarly to the buckle side, a single belt piece having a slit is connected to the tongue plate, the webbing is inserted, and the webbing for the lap belt and the webbing for the shoulder belt are connected at the slit part. The direction may be changed (not shown).

As shown in FIG. 1 to FIG. 6, the seat belt device 10 of the present invention includes a webbing portion 20ab constituting a buckle side portion of a lap belt 22 extending from a belt guide 16 to a buckle 12, and parallel to the webbing portion 20ab. And a belt body 30 that extends and is self-supporting in a state in which the seat belt is not mounted, and supports the webbing portion 20ab.
As shown in FIG. 7, the belt body 30 can be bent in a direction B approaching the seated occupant J from the self-supporting position A of the belt body 30, and is opposite to the direction approaching the seated occupant from the self-supporting position A of the belt body 30. C cannot be bent.

  As shown in FIGS. 1 to 7 and 13, the seat belt device 10 includes a buckle 12, a tongue plate 14 that can be inserted into and removed from the buckle 12, and a buckle 12 (one belt for changing the webbing direction to the buckle 12). When the pieces 32 are connected, the “buckle 12” includes “the case of the one piece of the band body 32 connected to the buckle 12”) and the left and right webbings 20 slidable on the tongue plate 14, respectively. The body 30 and retractors 54 and 56 connected to the end of the webbing 20 are provided.

  The band 30 is provided only for the buckle-side webbing 20ab among the buckle-side webbing 20ab and the tongue plate-side webbing 20at. However, one webbing piece 32 for changing the webbing direction may be connected to the tongue plate 14, and in this case, the buckle side webbing 20 ab is excluded except for one webbing piece 32 for changing the webbing direction. It is provided only for.

  The band 30 extends in parallel with the buckle-side webbing 20ab. The belt body 30 and the buckle-side webbing 20ab are on the inside of the vehicle with respect to the seated occupant J, and the tongue plate-side webbing 20at is on the outside of the vehicle with respect to the seated occupant J.

  The retractor includes a lap belt retractor 54 connected to the lap belt webbing 20a and a shoulder belt retractor 56 connected to the shoulder belt webbing 20b. The lap belt webbing 20 a is slidably inserted into the lap belt guide 16 and enters the seat cushion 52, and is connected to the lap belt retractor 54. The shoulder belt webbing 20 b is slidably inserted through the shoulder belt guide 18 and enters the seat back 50, and is connected to the shoulder belt retractor 56.

  The retractors 54 and 56 are retractors with a pretensioner. When a signal from a vehicle collision detection or vehicle collision prediction sensor is received, the pretensioner operates to tension the webbing 20, and the retractors 54 and 56 perform webbing 20. Wind up.

  The left and right lap belt guides 16 are fixed to the left and right side surfaces of the seat cushion 52, and the left and right shoulder belt guides 18 are fixed to the left and right upper ends of the seat back 50. The left and right lap belt guides 16 and the left and right shoulder belt guides 18 constitute four points of seat belt support of the four-point seat belt device.

  As shown in FIGS. 7 to 12, the band 30 includes a plurality of rigid band pieces 32 that are rotatably connected to each other. The strip piece 32 is made of resin, for example. The strip piece 32 has a webbing passage 32b through which the webbing 20 is slidably inserted. The webbing 20 extends through the webbing passage 32b. Since the plurality of rigid body pieces 32 are connected to rotate, the belt 30 can be bent at the connection point 34 in a direction approaching the occupant J from the self-standing posture (direction B in FIG. 7). Since the band 30 is composed of a connected body of the rigid pieces 32, and when the webbing passage 32b is closer to the band outer surface than the rotational connection point 34 and the webbing 20 is tensioned, the band 30 is adjacent to the band piece. Since the rotational force with which the end surfaces 32a of 32 closely contact each other works, it is possible to take a self-supporting posture. The belt body 30 is not allowed to bend at a connection point 34 (center of the connection pin 35) in a direction away from the occupant J from the self-standing posture (direction C in FIG. 7). Corresponding to the bending of the band 30, the webbing 20 inserted through the band 30 is also bent at the connection point 34.

In order to make the belt body 30 inflexible in the direction away from the occupant J from the self-supporting posture, the belt body 30 and its connecting structure have the following structure. That is, the turning connection point 34 of the belt 30 is located on the side surface portion 36 of the belt, which is the portion on the side in contact with the occupant J from the center line of the thickness of the belt 30 in the bending direction when the seat belt is worn. . Further, the belt body 30 is disposed on the belt body outer side surface portion 38 which is a portion opposite to the side in contact with the occupant J from the center line of the thickness in the bending direction of the belt body 30 when the seat belt is worn. It has a discontinuity 40. Two surfaces (adjacent band piece end surfaces 32a) that extend in a direction substantially perpendicular to the band body longitudinal direction, facing the band body longitudinal direction across the discontinuous part 40, are the discontinuous part 40 and the band body length. Abutment and separation are possible in the direction.
In the state where the seat belt is not attached, the adjacent belt body pieces 32 abut against each other at the opposing end surface 32a, and the belt body 30 is self-supporting (state A in FIG. 7 and FIG. 12). In the state where the seat belt is mounted, the adjacent band pieces 32 are separated from each other at the opposing end surface 32a, and the band 30 is bent toward the side closer to the occupant (state D in FIG. 7 and FIG. 11).

  When the belt 30 is in the self-supporting position (A in FIG. 7) with the seat belt not attached, the buckle 12 is above the upper surface of the seat cushion 52 (the portion of the upper surface of the seat cushion 52 that is directly below the buckle 12). The cushion 52 is located on the seat center side in the vehicle width direction from the side surface (the side surface on which the base portion of the belt body 30 is located), and the extending direction of the base portion (lower end portion) of the buckle 12 is seated in the vehicle width direction rather than vertically upward. The bending direction of the band body 30 and the extending direction of the base part of the band body 30 are set so as to be inclined by an angle K toward the center side (FIG. 7).

The bending of the belt 30 in the self-standing state can be set to a desired degree of bending as follows.
The length between both end surfaces 32a in the longitudinal direction of the strip body outer side surface portion 38 of each of the strip body pieces 32 (the strip body extending from the end surface 32a to the connection point 34 side of the both end surfaces 32a in the longitudinal direction) The length between the end faces 32a in the longitudinal direction at the intersection with the piece slope 32d) is L1, and the distance between the connecting points 34 at both ends in the longitudinal direction of each band piece 32 is L2. In the self-standing state of the band body 30 in the state where the seat belt is not attached, the opposed end surfaces 32a of the adjacent band body pieces 32 are in contact with each other (the state A in FIG. 7 and the state in FIG. 12).
When L1 = L2 in the self-standing state of the band body 30 in the state where the seat belt is not attached, the opposed end faces 32a of the adjacent band body pieces 32 are in contact with each other, the band is a connected body of the plurality of band body pieces 32 The body 30 is in a straight line state, and when L1> L2, the band body 30 that is a connection body of the plurality of band body pieces 32 bends at the connection point 34 and bends toward the passenger J. The longer L1 is than L2, the greater the bending degree of the band 30 at the connection point 34.
It should be noted that the contact and separation of the adjacent band piece 32 on the opposing end surface 32a are performed on the inclined surfaces (the band piece inclined surface extending from the end surface 32a toward the connecting point 34) 32d of the adjacent band piece 32. It may be replaced with contact and separation.

The extending direction of the base portion of the band 30 can be restricted to a predetermined range as follows.
As shown in FIGS. 14 and 15, the band 30 has a band rotating shaft 42 that extends in a direction orthogonal to the band longitudinal direction at the base (and therefore at the lower end of the band piece 32 at the lower end). The band rotating shaft 42 is attached to the side surface of the seat cushion 52 so as to be rotatable around the center of the band rotating shaft 42. The belt guide 16 is formed integrally with the belt body rotation shaft 42. The webbing 20 is connected to a retractor 54 provided inside the seat cushion 52 through the belt guide 16 from the webbing passage 32b of the band piece 32.

  The base portion of the belt body 30 (therefore, the lower end portion of the belt body piece 32 at the lower end) is a first stopper (stopper surface) formed of a first surface formed on the stopper block 44 fixed to the side surface of the seat cushion 52. ) 46 and a second stopper (stopper surface) 48 made of the second surface. The first stopper 46 restricts the extending direction of the band base when the band 30 is in a self-supporting state with no seat belt attached so as not to rotate rearward from the self-standing position. The second stopper 48 regulates the extending direction of the band base portion when the band body 30 is in the collapsed state with the seat belt attached so that the band base portion does not fall further.

Next, the operation and effect of the seat belt device 10 of the present invention will be described.
1 to 3 show the seat belt device 10 in a seat belt wearing state during normal use. In the seat belt wearing state, the tongue plate 14 is inserted and engaged with the buckle 12 in front of the waist of the seated occupant J. The band 30 is in contact with the occupant's waist. The shoulder belt 24 is unwound from the shoulder belt retractor 56, passes through the shoulder belt guide 18, extends from the shoulder belt guide 18 to the lap belt 22 without crossing in front of the occupant's chest, and becomes the lap belt 22. The lap belt guide 16 is inserted through the lap belt guide 16 and connected to the lap belt retractor 54.

  At the time of a collision or when a collision is predicted, the pretensioners of the retractors 54 and 56 operate in a seat belt wearing state, and tension is applied to the shoulder belt 24 and the lap belt 22. The occupant J is restrained by the seat and is restrained from moving forward and submarine.

  4 to 6 show the seat belt device 10 in a state where the seat belt is not worn during normal use. When the seat belt is not attached, the tongue plate 14 is removed from the buckle 12, and the shoulder belt 24 and the lap belt 22 are automatically wound around the retractors 56 and 54, respectively. The belt 30 is in a self-supporting state A, the buckle 12 is positioned at the upper end of the belt 30, and the tongue plate 14 is configured to be able to slide the shoulder belt 24 and the lap belt 22, so that the belt 30 is close to the side surface of the seat cushion 52. To position. (The tongue plate 14 may be positioned near the side surface of the seat cushion 52 by making the winding force of the lap belt retractor 54 larger than the shoulder belt retractor 56.) The belt 30 is located inside the occupant's vehicle. Therefore, the band 30 does not interfere with the passenger getting on and off. In this state, the passenger gets on and off the vehicle.

  When the occupant gets on the vehicle, sits down, and fastens the seat belt, the tongue plate 14 is removed with one hand, the lap belt 22 is pulled out of the retractor 54 while pulling the tongue plate 14, the tongue plate 14 is brought close to the buckle 12, and the buckle 12 is inserted.

  In that case, since the band 30 cannot be bent in the direction opposite to the direction approaching the seated occupant J from the self-supporting position A of the band 30 (direction C in FIG. 7), the tongue plate 14 is inserted into the buckle 12. When the tongue plate insertion force is applied in the direction C opposite to the direction approaching the seated occupant J from the self-standing position A of the belt body 30, the belt body 30 does not move from the self-standing position in the tongue plate insertion direction C and generates a reaction force. . Therefore, the tongue plate 14 can be inserted into the buckle 12 by one hand operation with only one hand holding the tongue plate 14 without supporting the buckle 12 by hand. Compared to the above, the operability is improved.

  Since the belt body 30 can be bent in the direction (B in FIG. 7) approaching the seated occupant J from the self-supporting position A of the belt body 30, the belt body 30 fits the waist of the seated occupant when the seat belt is worn. ) And the wearing feeling is good.

  Since the seat belt device 10 has the left and right webbings 20 and the retractors 54 and 56 are connected to the webbing ends, when the tongue plate 14 is inserted into the buckle 12 and then released, the retractors 54 and 56 are removed. By winding the webbing, the belt 30 automatically fits the seated occupant's waist, and the connecting portion of the tongue plate 14 and the buckle 12 automatically comes in front of the occupant's waist. Since it is not necessary to move the connecting portion between the tongue plate 14 and the buckle 12 to the front of the waist by hand, the operability is good.

  The band body 30 includes a plurality of rigid band body pieces 32 that are rotatably connected to each other, and the band body 30 in the self-standing position A is not deformed in the tongue plate insertion direction C and generates a reaction force in a stable posture. . Since the belt 30 does not take a self-supporting posture by the urging force by the elastic support member as in Patent Document 1, the wrap belt is subjected to the urging force in the direction away from the waist by the elastic support member. First, the lap belt 22 can be brought into close contact with the occupant to ensure occupant restraint.

  The band 30 has a discontinuous portion 40 (discontinuous portion 40 between the end surfaces 32a of adjacent band pieces 32 shown in FIGS. 7 and 11) in the band body longitudinal direction on the band outer surface portion 38, Since the end faces 32a of the adjacent band pieces 32 facing each other across the discontinuous portion 40 can be contacted and separated in the longitudinal direction of the band body, they face each other across the band discontinuous portion when the belt is mounted. The end face 32a of the band piece 32 is separated and the band 30 is fitted to the occupant's waist. When the belt is not attached, the tension of the webbing 20 by the retractors 54 and 56 causes the opposing surfaces 32a to contact each other across the discontinuous portion 40 and the belt 30 behaves as a rigid body, so the buckle reaction force when the tongue plate is inserted Is obtained.

  The band body 30 has a rotation connection point 34 that rotatably connects adjacent pieces to a side surface part 36 of the band body that is in contact with the occupant J, and the belt body outer side surface part from the rotation connection point 34. Since the webbing passage 32b is provided on the side 38, the end surfaces 32a of the adjacent band pieces 32 are brought into close contact with the connection rotation point 34 when the webbing 20 is tensioned by pulling the retractors 54 and 56 when the belt is not attached. The moment which rotates and energizes the strip body piece 32 acts on the side, and the strip body 30 maintains a self-supporting posture.

  When the belt 30 is in the self-supporting position A when the seat belt is not attached, the buckle 12 is located above the upper surface of the seat cushion 52 just below the buckle and from the side surface of the seat cushion 52 to the seating seat center side in the vehicle width direction. The movement distance of the tongue plate 14 to the buckle 12 when the belt is attached is shorter than when the belt 30 extends vertically upward at the self-supporting position, and the tongue plate 14 can be easily inserted into the buckle 12. Further, the direction (extension direction) of the buckle 12 when the belt body 30 is at the self-supporting position A is inclined toward the seat center side in the vehicle width direction with respect to the vertical direction, and the buckle 12 and the tongue plate 14 approach the parallel. It is easy to insert the plate 14 into the buckle 12.

  Since a stopper 46 is provided for restricting the belt body 30 from falling backward from the autonomous position relative to the base of the belt body 30, when the tongue plate 14 is buckled 12, the rear of the buckle 12 in the autonomous position is provided. The tongue plate 14 can be easily inserted into the buckle 12 with one hand.

  Although the illustrated example shows the case where the present invention is applied to a seat belt device for a driver's seat, the seat belt device of the present invention may be used as a seat belt device for a passenger seat, or a rear seat or an intermediate seat may be used. It may be used as a seat belt device for an intermediate seat in some cases. In the illustrated example, the tongue plate side lap belt is positioned on the outer side in the vehicle width direction. However, the tongue plate side lap belt may be positioned on the inner side in the vehicle width direction.

  Although the four-point seat belt device has been described above as an example, the present invention may be applied to a webbing that connects the buckle and the anchor of the three-point seat belt device. In the case of the three-point seat belt device, a webbing that couples the buckle and the anchor is provided with a belt body composed of a coupling body of a plurality of belt body pieces. Such a case is also included in the present invention.

10 seat belt device 12 buckle 14 tongue plate 16 (lap) belt guide 18 (shoulder) belt guide 20 webbing 20a lap belt webbing 20ab buckle side webbing 20at tongue plate side webbing 20b shoulder belt webbing 22 lap belt 24 shoulder belt 30 belt Body 32 Band piece 32a End face 32b Webbing passage 32c Slit 32d Slope 34 Connection point 35 Connection pin 36 Side surface part 38 Inside body side part 40 Discontinuous part 42 Band rotation shaft 44 Stopper block 46, 48 Stopper (stopper surface)
50 Seat Back 52 Seat Cushion 54 Wrap Belt Retractor 56 Shoulder Belt Retractor A Independent Position

Claims (7)

A seat belt device comprising: a webbing portion constituting a lap belt portion extending from a belt guide to a buckle; and a belt body extending in parallel with the webbing portion and independently supporting the webbing portion in a seat belt non-wearing state. ,
The belt unit is a seat belt device that can be bent in a direction approaching the seated occupant from the self-supporting position of the belt body and cannot be bent in a direction opposite to the direction approaching the seated occupant from the self-supporting position of the belt body. The buckle and a tongue plate detachable from the buckle;
Left and right webbings including a buckle side webbing and a tongue plate side webbing slidable on the buckle and the tongue plate, respectively
The strip extending in parallel with the buckle-side webbing;
A retractor coupled to an end of the webbing;
The seat belt device according to claim 1, comprising a four-point seat belt device comprising:   The seat belt device according to claim 1 or 2, wherein the band includes a plurality of rigid band pieces that are rotatably connected to each other.   The band has a discontinuous portion in the longitudinal direction of the band on the outer side surface of the band opposite to the side in contact with the occupant, and is opposed to the longitudinal direction of the band across the discontinuous portion. 4. The seat belt device according to claim 1, wherein two surfaces extending in a direction substantially orthogonal to the belt can be abutted and separated in the belt longitudinal direction at the discontinuous portion. 5. .   The seat belt device according to claim 3, wherein the belt body has a connection portion having a connection point for rotatably connecting adjacent pieces to a side surface of the belt body on the side in contact with the occupant.   When the belt is in a self-supporting position with no seat belt attached, the buckle is located above the upper surface of the seat cushion and from the side surface of the seat cushion toward the center of the seat in the vehicle width direction, and the extending direction of the buckle is from vertically above The seat belt device according to any one of claims 1 to 5, wherein a bending direction of the belt body and an extending direction of the base portion of the belt body are set so as to be inclined toward the seat center side in the vehicle width direction.   The seatbelt apparatus of any one of Claims 1-6 with which the stopper which controls that the said band falls down from a self-supporting position to a vehicle rear is provided with respect to the base of the said band.

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