JP2011156936A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device which enables an occupant to move a buckle sufficiently up to an attachment assist position where a tongue is easy to attach to the buckle and which stabilizes the buckle at the attachment assist position and a fastening position. <P>SOLUTION: A compression coil spring 94 is provided between a pulley 72 and the buckle 74, so that an energizing force of the compression coil spring 94 energizes a wire 70 to its end side and drop by self weight etc. is prevented or suppressed. The wire 70 is sent out by the rearward sliding of a slider, so that, even if a portion of the wire 70 wound on the pulley 72 tends to bend so as to separate from the pulley 72, the compression coil spring 94 pulls the wire 70 to its end side via the buckle 74. Thereby, the buckle 74 can be moved to the attachment assist position by sending out the wire 70. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seat belt device for restraining a body of an occupant seated on a vehicle seat by a webbing belt.

  In the buckle device disclosed in the following Patent Document 1, the base end portion of the wire whose buckle is locked to the distal end portion is locked to the slider. A female screw is formed on the slider, and a guide screw passes through this female screw. One end of the guide screw in the longitudinal direction is mechanically connected to the motor. When the guide screw rotates by the driving force of the motor, the slider moves in the longitudinal direction of the guide screw. When the slider moves from the proximal end side (motor side) of the guide screw to the distal end side (opposite side of the motor), the wire extends upward by the moving distance of the slider. When the buckle is raised by the extension of the wire, the tongue provided on the webbing belt can be easily attached to the buckle, and the webbing belt can be easily attached.

German Patent Application Publication No. 102006048817

  In the case of the above configuration, the wire is bent in the middle thereof. For this reason, considering the durability of the wire, it is desirable to apply a wire with low rigidity. However, if the rigidity of the wire is lowered, even if the proximal end portion of the wire is slid to the distal end side of the guide screw together with the slider, it is difficult to cause the wire to bend and extend the distal end portion of the wire upward. Even if the tip of the wire extends, if the rigidity of the wire is low, the extended wire falls down and it is difficult to raise the buckle.

  In consideration of the above facts, the present invention can easily move the buckle to the mounting assist position while allowing the occupant to easily attach the tongue to the buckle, and stabilize the buckle at the mounting assist position or the mounting position. It is an object to obtain a seat belt device that can be used.

  The seat belt device according to the first aspect of the present invention includes a webbing belt formed in a long belt shape, a tongue provided on the webbing belt, and a tongue provided on a side of a vehicle seat. And a connecting member that is formed in a flexible long shape and is fixed to the buckle on the tip side, and can output both forward and reverse driving forces, and the base end side of the connecting member is directly Or a drive mechanism that has drive means that are indirectly connected, pulls the connection member to the longitudinal base end side by the forward drive force of the drive means, and sends the connection member to the front end side by the reverse drive force And the connecting member is pulled by the forward driving force of the driving means to stabilize at the mounting position where the buckle reaches, and the buckle fed by a predetermined amount by the reverse driving force of the driving means is And a, and attitude control means for stabilizing at attachment assist position in front or above the sheet than on position.

  In the seat belt device according to the first aspect of the present invention, when the reverse driving force is output from the driving means constituting the driving mechanism, the connecting member having the buckle attached to the tip side is sent out to the tip side. Thus, in a state where the connecting member is sent out, the buckle is stabilized at the mounting assist position by the attitude control means. Since the front side or the upper side of the seat, which is the position of the buckle before the connecting member is sent out, the buckle is stable at the mounting assist position, so that the tongue can be easily attached to the buckle. Easy to install.

  In addition, since the connecting member has flexibility, if the connecting member is bent at the middle part in the longitudinal direction and the base end side is directed in the front-rear direction or the left-right direction of the seat, the connecting member is moved to the front end side or the base in the longitudinal direction. A sufficient space for moving to the end side can be secured.

  Further, when a normal rotation driving force is output from the driving means with the tongue attached to the buckle, the connecting member is pulled toward the base end side and the buckle moves. The buckle thus moved is stabilized at the mounting position by the posture control means.

  As described above, in the seat belt device according to the present invention, the buckle is moved by feeding and pulling the flexible connecting member, but the buckle can be stabilized at the mounting assist position or the mounting position by the attitude control means. .

  Moreover, in the seat belt device according to the present invention, the buckle is moved by feeding and pulling the connecting member, so that it is installed by resisting pulling to the distal end side of the connecting member on the base end side of the connecting member. Even between the position and the mounting assist position, it is possible to prevent or suppress the buckle pulled via the webbing belt and the tongue from inadvertently moving to the front of the seat.

  The seat belt device according to a second aspect of the present invention is the seat belt device according to the first aspect, wherein the posture control means has an opening into which the tongue is inserted at the mounting assist position rather than the mounting position. The direction of the upper end portion of the buckle is tilted upward or rearward of the seat.

  In the seat belt device according to the second aspect of the present invention, when the buckle moves to the mounting assist position, the posture control means moves the upper end of the buckle above or behind the seat from the state where the buckle is positioned at the mounting position. Tilt. For this reason, when the occupant wears the webbing belt, the tongue is further easily attached to the buckle.

  A seat belt device according to a third aspect of the present invention is the seat belt device according to the first or second aspect of the present invention, wherein the urging means urges the connecting member toward the tip end side and the mounting assist position. The posture control means is configured including

  In the seat belt device according to the third aspect of the present invention, the flexible connecting member is urged toward the mounting assist position side by the urging means constituting the attitude control means. When the connecting member is sent out by the reverse driving force of the driving means, the distal end side of the connecting member is pulled toward the forcible mounting assist position by the biasing force of the biasing means. Thereby, the buckle can reach the mounting assist position, and the buckle is stabilized at the mounting assist position.

  As described above, the seat belt device according to the present invention can sufficiently move the buckle to the mounting assist position, and can stabilize the buckle at the mounting assist position or the mounting position.

1 is a front view schematically showing an overall configuration of a seat belt device according to a first embodiment of the present invention. 1 is a perspective view schematically showing a configuration of a main part of a seat belt device according to a first embodiment of the present invention. It is a front view showing roughly the composition of the principal part of the seatbelt device concerning a 1st embodiment of the present invention. It is a side view which shows roughly the structure of the principal part of the seatbelt apparatus which concerns on the 1st Embodiment of this invention. It is a front view corresponding to FIG. 3 which shows the state which the buckle moved to the mounting assistance position. It is a perspective view which shows roughly the structure of the principal part of the seatbelt apparatus which concerns on the 2nd Embodiment of this invention. It is a front view which shows roughly the structure of the principal part of the seatbelt apparatus which concerns on the 2nd Embodiment of this invention. It is a side view which shows roughly the structure of the principal part of the seatbelt apparatus which concerns on the 2nd Embodiment of this invention.

<Configuration of First Embodiment>
FIG. 1 is a side view showing the entire configuration of a seat belt device 10 according to a first embodiment of the present invention from the side of a vehicle.

  The seat belt device 10 shown in this figure includes a webbing take-up device 12. The webbing take-up device 12 includes a frame 14 fixed to the vehicle body below the center pillar of the vehicle. A spool 16 having an axial direction substantially along the vehicle longitudinal direction is directly or indirectly supported on the frame 14 so as to be rotatable around its own axis. The longitudinal end of the long belt-like webbing belt 18 is locked to the spool 16.

  When the spool 16 rotates in one winding direction around its own axis, the spool 16 winds up the webbing belt 18 from the proximal end in the longitudinal direction, and the webbing belt 18 is wound up with the webbing belt 18 wound up. When pulled to the side, the webbing belt 18 wound around the spool 16 is pulled out, while the spool 16 rotates in the pulling direction opposite to the winding direction described above.

  The webbing belt 18 whose base end is locked to the spool 16 extends along the center pillar to the upper side of the center pillar. A shoulder anchor 20 is attached to the vehicle body near the upper end of the center pillar. The shoulder anchor 20 includes a slip joint 22. The webbing belt 18 extended to the vicinity of the upper end portion of the center pillar and the slit hole 24 of the slip joint 22 are folded back and extended to the lower side of the vehicle. The front end portion of the webbing belt 18 turned back by the slip joint 22 is integrally fixed to the front end portion of the anchor 26. The base end portion of the anchor 26 is mechanically connected to the vehicle body of the vehicle on which the seat belt device 10 is mounted, the frame 30 of the seat 28 to which the seat belt device 10 corresponds (the vehicle body in the present embodiment), and the like. Yes.

  On the other hand, as shown in FIG. 1, a buckle moving device 40 as a drive mechanism is provided on the side opposite to the side where the anchor 26 is provided via the seat 28. Here, the configuration of the buckle moving device 40 is shown in a perspective view in FIG. 3 shows the configuration of the buckle moving device 40 in a front sectional view, and FIG. 4 shows the configuration of the buckle moving device 40 in a side sectional view.

  As shown in these drawings, the buckle moving device 40 includes a frame 42. The frame 42 includes a base plate 44. A guide plate 46 is erected from one end of the base plate 44 along the width direction of the sheet 28 (in this embodiment, the end on the sheet 28 side). Further, a guide plate 48 that is paired with the guide plate 46 is provided above the side of the base plate 44 opposite to the side on which the guide plate 46 is provided. The guide plate 46 and the guide plate 48 are connected to the base plate 44. Are integrally connected to each other by an upper wall 50 provided on the upper side.

  A slider 52 is provided between the guide plate 46 and the guide plate 48 constituting the frame 42. As shown in FIGS. 2 and 4, the guide protrusions 54 protrude from the end portions on both sides of the slider 52 along the width direction of the sheet 28, and the guide plate 46 and the guide plate 48 open on surfaces facing each other. The guide groove 56 is formed so as to fit. The guide groove 56 is elongated in the front-rear direction of the seat 28, supports the guide projection 54 so as to be slidable in the front-rear direction of the seat 28, and the slider 52 guides the displacement of the seat 28 in the up-down direction and the left-right direction. While being restricted by the plate 46 and the guide plate 48, the seat 28 can slide in the front-rear direction.

  As shown in FIGS. 2 and 3, a rack portion 58 is formed at the lower end portion of the slider 52, and a pinion 60 is provided below the rack portion 58. A motor 62 as drive means is attached on the base plate 44 to the side of the pinion 60 along the width direction of the sheet 28. A pinion 60 is coaxially and integrally attached to the tip of the output shaft of the motor 62 whose axial direction is the width direction of the webbing belt 18, and the pinion 60 is rotated by the driving force output from the motor 62. Also. The pinion 60 meshes with the rack portion 58 described above, and when the pinion 60 rotates forward by the normal rotation driving force output from the motor 62, the rack portion 58 slides to the front side of the seat 28, and the reverse rotation output from the motor 62. When the pinion 60 is reversed by the driving force, the rack portion 58 slides to the rear side of the seat 28.

  On the other hand, as shown in FIGS. 2 and 3, the longitudinal base end portion of the wire 70 as a connecting member is locked to the rear end portion of the slider 52 along the front-rear direction of the seat 28. Although the wire 70 has flexibility, it has relatively high rigidity and tends to stretch with its restoring force even when the wire 70 is bent.

  Further, a pulley 72 as a connecting member turning means is provided on the rear side of the seat 28 with respect to the frame 42. The pulley 72 is supported by the frame 30 of the seat 28 so as to be rotatable around an axis whose axial direction is the width direction of the seat 28. A wire 70 is hung on the pulley 72, and the wire 70 extending from the slider 52 to the rear side of the seat 28 is hung on the pulley 72, so that the direction of the front end is forward with respect to the upper side of the seat 28. It can be changed to a direction inclined by a predetermined angle. A buckle 74 is fixed to the tip of the wire 70.

  An opening 76 is formed at the end of the buckle 74 opposite to the wire 70, and the tongue 78 provided on the webbing belt 18 is inserted into the buckle 74 between the slip joint 22 and the anchor 26 described above. Can be done. A holding mechanism such as a latch is provided inside the buckle 74, and when the tongue 78 is inserted into the buckle 74 from the opening 76, the holding mechanism is activated to hold the tongue 78, and the tongue 78 is not attached to the buckle 74. Prevent getting out of the way.

  Further, a buckle switch (not shown) is provided in the buckle 74. When the tongue 78 is inserted into the buckle 74 and the holding mechanism holds the tongue 78, the buckle switch is switched from the OFF state to the ON state. This buckle switch is electrically connected to an ECU (not shown) as motor control means. When the buckle switch is switched from the OFF state to the ON state, the ECU drives the motor 62 in the normal direction. The ECU is further electrically connected to a door lock detecting means for detecting whether or not the vehicle door is unlocked. When the door lock detecting means detects that the door is unlocked, the ECU The motor 62 is reversely driven.

  On the other hand, as shown in FIGS. 1 to 3, a spring locking piece 82 is provided between the pulley 72 and the frame 42 in the frame 30. As shown in FIG. 2, the spring locking piece 82 is provided. Through which the wire 70 passes. A compression coil spring 84 is provided between the spring locking piece 82 and the slider 52, and the wire 70 passes through the inside of the compression coil spring 84 between the slider 52 and the spring locking piece 82. . One end of the compression coil spring 84 is in pressure contact with the slider 52 and the other end is in pressure contact with the spring locking piece 82 to urge the slider 52 forward of the seat 28.

  On the other hand, as shown in FIGS. 1 to 3, a spring locking piece 92 is provided on the frame 30 above the pulley 72. As shown in FIG. 2, the wire 70 wound around the pulley 72 passes through the spring locking piece 92. Between the spring locking piece 92 and the buckle 74, a compression coil spring 94 constituting an attitude control means is provided as an urging means. One end of the compression coil spring 84 is in pressure contact with the spring locking piece 92 and the other end is in pressure contact with the buckle 74, and the wire 70 is urged to the distal end side via the buckle 74, so that the wire 70 is stretched. Holding.

<Operation and Effect of First Embodiment>
Next, the operation and effect of the present embodiment will be described.

  In the seat belt device 10 according to the present embodiment, in the initial state, as shown in FIG. 1 and FIG. The buckle 74 is located at the lower mounting position. In this state, when the vehicle door is unlocked for the passenger to get on, the ECU 62 drives the motor 62 in the reverse direction. When the pinion 60 is reversely rotated by the reverse drive of the motor 62, the rack portion 58 that meshes with the pinion 60 is sent out to the rear side of the seat 28, whereby the slider 52 is guided to the guide grooves 56 of the guide plates 46 and 48. The sheet 28 slides backward against the urging force of the compression coil spring 84.

  When the slider 52 slides rearward, the longitudinal base end portion of the wire 70 locked to the slider 52 moves rearward of the sheet 28 and the wire 70 is fed rearward. Although the wire 70 is wound around the pulley 72 at the longitudinal intermediate portion, the wire 70 has high rigidity and tries to stretch with the restoring force of the wire 70 itself, so that the proximal end portion of the wire 70 moves backward. Then, the portion of the wire 70 that is wound around the pulley 72 bends away from the pulley 72 and tries to move rearward of the seat 28.

  However, even if the wire 70 tries to bend in this manner, the compression coil spring 94 urges the wire 70 toward the distal end side via the buckle 74. For this reason, the wire 70 moves to the distal end side without causing the above-described bending, and the distal end portion of the wire 70 moves linearly in a direction inclined forward by a predetermined angle with respect to the upper side of the sheet 28. As the tip of the wire 70 moves in this manner, the buckle 74 moves to the mounting assist position on the front side and the upper side of the seat 28 with respect to the mounting position as shown in FIG.

  Further, in the state where the buckle 74 has moved to the mounting assist position in this way, for example, the tip of the wire 70 tends to descend due to the weight of the buckle 74 or the weight of the tip of the wire 70, but the compression coil spring 94 is The urging force resists the lowering of the tip side of the wire 70. For this reason, the buckle 74 is held in a stable state at the mounting assist position. Thus, since the buckle 74 is held in a stable state at the mounting assist position, the tongue 78 can be easily mounted on the buckle 74 with the passenger opening the door and getting on and seated on the seat 28.

  Next, when the tongue 78 is attached to the buckle 74 and the buckle switch in the buckle 74 is switched from the OFF state to the ON state, the ECU drives the motor 62 to rotate forward. When the pinion 60 is rotated forward by the motor 62 being driven to rotate forward, the rack portion 58 that meshes with the pinion 60 is sent to the front side of the seat 28, whereby the slider 52 is guided to the guide grooves 56 of the guide plates 46 and 48. Then, it slides forward of the seat 28 against the urging force of the compression coil spring 84.

  When the slider 52 slides forward, the longitudinal base end portion of the wire 70 locked to the slider 52 moves to the front of the sheet 28, and the wire 70 is pulled forward. By pulling the wire 70, the distal end side of the portion around the pulley 72 along the longitudinal direction of the wire 70 in the longitudinal direction of the wire 70 resists the urging force of the compression coil spring 94 toward the proximal end side. Move linearly. Thus, the buckle 74 returns to the mounting position by moving the tip of the wire 70. Thus, even when the buckle 74 returns to the mounting position, the compression coil spring 94 urges the wire 70 toward the distal end side, so that the buckle 74 can be held stably at the mounting position.

  Thus, in this embodiment, the buckle 74 can be held in a stable state at the mounting position or the mounting assist position. Moreover, the longitudinal direction of the wire 70 is along the front-rear direction of the seat 28 on the base end side with respect to the portion wound around the pulley 72, and the buckle 74 is moved back and forth by sliding the slider 52 back and forth between the mounting position and the mounting assist position. Therefore, the interval between the mounting position and the mounting assist position can be made sufficiently long, and the buckle 74 can be sufficiently moved forward and upward of the seat 28 at the mounting assist position.

  Further, when the buckle 74 is pulled in any state where the buckle 74 is positioned between the mounting position and the mounting assist position, or between the mounting position and the mounting assist position, the tension is applied to the wire 70. An attempt is made to pull the slider 52 backward. As described above, when the slider 52 is pulled rearward, the pinion 60 tries to rotate forward. However, if the motor 62 is not operating in this state, the motor 62 resists forward rotation of the pinion 60. As a result, inadvertent movement of the buckle 74 forward or upward of the seat 28 can be prevented or suppressed.

<Configuration of Second Embodiment>
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the same reference numerals are assigned to portions that are basically the same as those in the first embodiment, and a detailed description thereof is omitted.

  FIG. 6 is an exploded perspective view showing the configuration of the buckle moving device 212 of the seat belt device 210 according to the present embodiment.

  As shown in this figure, the buckle moving device 212 includes a frame 214, and a motor 62 is mounted on a base plate 216 constituting the frame 214 instead of the base plate 44. In the present embodiment, the buckle moving device 212 is not provided with the slider 52 or the pinion 60, and the output shaft of the motor 62 is a flat tooth and the external gear 218 is coaxial and integral with the output shaft of the motor 62. Attached. On the side in the rotational radius direction of the gear 218, a spur-tooth gear 220 having a greater number of teeth than the gear 218 is provided.

  The gear 220 is disposed on the side of the support wall 222 provided on one end side of the base plate 216 along the width direction of the seat 28, and the axial direction of the output shaft of the motor 62 is supported on the support shaft 224 attached to the support wall 222. Is supported so as to be rotatable around an axis having the same orientation as the axial direction. The gear 220 meshes with the gear 218. When the gear 218 rotates with the driving force output from the motor 62, the rotation of the gear 218 is transmitted to the gear 220, and the gear 220 rotates.

  On the lateral side in the rotational radius direction of the gear 220, a spur gear 226 having a larger number of teeth than the gear 220 is provided. The gear 226 is disposed on the side of the support wall 222 and is supported by a support shaft 228 attached to the support wall 222 so as to be rotatable around an axis whose axial direction is the same as the axial direction of the output shaft of the motor 62. . A take-up pulley 230 is provided between the gear 226 and the support wall 222 in place of the pulley 72 in the first embodiment. The take-up pulley 230 is coaxially and integrally connected to the gear 226 and is rotatably supported on the support shaft 228 together with the gear 226.

  A longitudinal base end portion of the wire 70 is locked to the winding pulley 230. Unlike the pulley 72 in the first embodiment, when the forward driving force output from the motor 62 is transmitted to the gear 226 via the gear 218 and the gear 220 and the winding pulley 230 rotates together with the gear 226, the winding is performed. The take-up pulley 230 pulls the distal end side of the wire 70 toward the proximal end side in the longitudinal direction while winding the wire 70 from the proximal end side to the outer peripheral portion.

  In the first embodiment, the buckle 74 is attached to the distal end of the wire 70. In the present embodiment, the longitudinal base of the link bar 232 constituting the posture control means is attached to the distal end of the wire 70. The end is locked, and a buckle 74 is attached to the longitudinal end of the link bar 232.

  On the other hand, a spur toothed external gear 242 having a larger number of teeth than the gear 220 is provided at a position on the side of the rotational radius direction of the gear 220 and different from the position where the gear 226 is arranged. The gear 242 is disposed on the side of the support wall 222 and is supported by a support shaft 244 attached to the support wall 222 so as to be rotatable around an axis whose axial direction is the same as the axial direction of the output shaft of the motor 62. . Between the gear 242 and the support wall 222, a drive arm 252 that constitutes a posture control means together with the link bar 232 is provided. The drive arm 252 is formed in a thin plate shape whose thickness direction is along the rotation axis direction of the gear 242. The support shaft 244 passes through the base end side in the longitudinal direction of the drive arm 252 and is integrally connected to the gear 242, and the drive arm 252 rotates around the support shaft 244 together with the gear 242.

  The distal end side of the drive arm 252 is connected to the link bar 232 by a connecting shaft 254 whose axial direction is the same as the axial direction of the output shaft of the motor 62. The drive arm 252 and the link bar 232 connected by the connecting shaft 254 are relatively rotatable around the connecting shaft 254.

  On the other hand, on the upper side of the drive arm 252, a driven arm 262 that constitutes a posture control means together with the link bar 232 and the drive arm 252 is provided. The driven arm 262 is formed in a thin plate shape whose thickness direction is along the thickness direction of the drive arm 252. The follower arm 262 is supported on a support shaft 264 attached to the support wall 222 so that the base end in the longitudinal direction is rotatable about an axis whose axial direction is the same as the axial direction of the output shaft of the motor 62. The distal end side of the driven arm 262 in the longitudinal direction is connected to the link bar 232 on the distal end side of the link bar 232 from the connection position of the drive arm 252 in the link bar 232 by the connecting shaft 266 in the same direction as the axial direction of the output shaft of the motor 62. It is connected. The driven arm 262 and the link bar 232 connected by the connecting shaft 266 are relatively rotatable around the connecting shaft 266.

  As can be understood from the above description, the support wall 222, the drive arm 252, the driven arm 262, and the link bar 232 constitute a four-bar linkage mechanism, and when the drive arm 252 rotates around the support shaft 244, the driven The arm 262 and the link bar 232 are rotated relative to each other. Here, when the driving arm 252 is rotated by a certain angle so as to raise its tip, the longitudinal dimensions of the driving arm 252 and the driven arm 262 are such that the connecting shaft 254 is positioned in front of the seat 28 relative to the connecting shaft 266. The connecting positions of the support wall 222, the drive arm 252, the driven arm 262, and the link bar 232 are set.

<Operation and Effect of Second Embodiment>
Next, the operation and effect of the present embodiment will be described.

  In the seat belt device 210 according to the present embodiment, in the initial state, in the vicinity of the seat cushion seat surface constituting the seat 28 near the rear end portion of the seat 28 as shown in FIG. 7 or below the seat cushion. The buckle 74 is positioned at the mounting position, and in this state, the proximal end side of the wire 70 is wound around the winding pulley 230. In this state, when the vehicle door is unlocked for the passenger to get on, the ECU 62 drives the motor 62 in the reverse direction. When the gear 218 is rotated in reverse by the motor 62 being driven in reverse rotation, the winding pulley 230 is rotated in reverse via the gear 220 and the gear 226, and the wire 70 is sent out from the winding pulley 230.

  On the other hand, as described above, the gear 218 rotates in the reverse direction so that the drive arm 252 is raised through the gear 220 and the gear 242 so as to raise the tip end side. Since the link bar 232 is connected to the distal end side of the drive arm 252, when the distal end side of the drive arm 252 is rotated so as to rise, the link bar 232 rises toward the mounting assist position. Since the wire 70 has flexibility, when the wire 70 is fed out from the take-up pulley 230, the tip end side tends to descend due to the weight of the wire 70 or the weight of the buckle 74. However, when the drive arm 252 rotates around the support shaft 244 and the distal end side of the drive arm 252 rises, the distal end of the wire 70 is pulled through the link bar 232. For this reason, as shown in FIG. 8, the buckle 74 that has reached the mounting assist position is stabilized.

  Further, as described above, in a state where the driving arm 252 rotates by a certain angle and the buckle 74 reaches the mounting assist position, the connecting shaft 254 is positioned in front of the seat 28 with respect to the connecting shaft 266. For this reason, the direction of the link bar 232 from the longitudinal direction proximal end side to the distal end side is inclined backward with respect to the upper side of the seat 28. In this state, the opening 76 of the buckle 74 faces in a direction inclined backward with respect to the upper side of the seat 28, so that the tongue 78 can be more easily attached to the buckle 74.

  Next, when the tongue 78 is attached to the buckle 74 and the buckle switch in the buckle 74 is switched from the OFF state to the ON state, the ECU drives the motor 62 to rotate forward. When the gear 218 rotates in the normal direction by driving the motor 62 in the normal direction, the wire 70 is wound around the winding pulley 230 from the proximal side in the longitudinal direction, and the distal end of the wire 70 and thus the buckle 74 is lowered.

  On the other hand, when the gear 218 rotates forward as described above, the drive arm 252 rotates so that the tip side thereof is lowered. Since the link bar 232 is connected to the distal end side of the drive arm 252, when the distal end side of the drive arm 252 is rotated so as to be lowered, the link bar 232 is lowered and the buckle 74 is directed to the mounting position. Even when the buckle 74 reaches the mounting position in this way, the buckle 74 is supported by the drive arm 252 and the driven arm 262 via the link bar 232, so that the buckle 74 is stabilized at the mounting position.

  In addition, when the buckle 74 or the wire 70 is pulled upward or forward of the seat 28, the proximal end side of the wire 70 is directly or indirectly opposed to the pulling force when the buckle 74 or the wire 70 is pulled upward or forward. Even if the buckle 74 is positioned between the mounting position and the mounting assist position, the buckle 74 pulled as described above inadvertently moves upward or forward of the seat 28. It is good also as a structure which prevents or suppresses.

10 Seat belt device 18 Webbing belt 40 Buckle moving device (drive mechanism)
62 Motor (drive means)
70 wire (connection member)
74 buckle 78 tongue 94 compression coil spring (biasing means, attitude control means)
210 Seat belt device 212 Buckle moving device (drive mechanism)
232 Link bar (attitude control means)
252 Drive arm (attitude control means)
262 Follower arm (attitude control means)

Claims (3)

A webbing belt formed into a long belt,
A tongue provided on the webbing belt;
A buckle provided on a side of a vehicle seat and to which the tongue is mounted;
A connecting member that is formed in a flexible long shape and is fixed to the buckle on the tip side;
It has drive means capable of outputting both forward and reverse drive forces and the base end side of the connecting member is connected directly or indirectly, and the connecting member is moved in the longitudinal direction by the forward drive force of the drive means. A driving mechanism that pulls toward the end side and feeds the connecting member to the tip side with a reverse driving force;
The connecting member is pulled by the forward drive force of the drive means to stabilize the attachment position where the buckle arrives, and the buckle fed by a predetermined amount by the reverse drive force of the drive means is more than the attachment position. Attitude control means for stabilizing at a front or upper mounting assist position of the seat;
A seat belt device comprising:   2. The seat belt according to claim 1, wherein the posture control unit tilts the upper end portion of the buckle in which the opening into which the tongue is inserted is formed at the mounting assist position rather than the mounting position toward the upper side or the rear side of the seat. apparatus.   The seat belt device according to claim 1 or 2, wherein the posture control means includes an urging means for urging the connecting member toward the tip end side and the mounting assist position.

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