JP2008290697A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device having excellent operability and comfortableness. <P>SOLUTION: This seat belt device comprises a guide member 3 having a fixed end 3a connected to a shoulder 2c of a backrest 2b on the vehicle inner side, a free end 3b projecting forward from the backrest 2b, and a cylindrical part 3c extending from the fixed end 3a toward the free end 3b, an anchor 4 disposed near the side surface of a sitting part 2a on the vehicle inner side, a buckle 5 disposed near the side surface of the sitting part 2a on the door side, a retractor 6 which is installed in a vehicle seat 2 and performs the winding and unwinding of a seat belt 7, the seat belt 7 having one end connected to the retractor 6 and the other end extending along the cylindrical part 3c of the guide member 3; and connected to the anchor 4, and a tongue 8 disposed between the free end 3b of the guide member 3 for the seat belt 7 and the anchor 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat belt device mounted on a vehicle such as an automobile, and more particularly to a seat belt device excellent in comfort and operability.

  In general, a vehicle such as an automobile is provided with a seat belt device that restrains an occupant on a vehicle seat that includes a seat portion on which the occupant is seated and a backrest portion that is positioned on the back of the occupant and has left and right shoulders. Such a seat belt device includes a seat belt that restrains an occupant, a retractor that is embedded in a vehicle seat and winds and unwinds the seat belt, a guide anchor provided on a B pillar (center pillar) of the vehicle, A belt anchor disposed on a lower surface portion of the seat portion on the door side, a buckle disposed on a side surface portion on the vehicle interior side of the seat portion, and a tongue that is slidably disposed on the seat belt. One end of the belt is connected to the retractor, the other end is wrapped around the guide anchor and connected to the belt anchor, and the tongue is disposed between the guide anchor and the belt anchor. Then, an occupant seated on the seat portion pulls the tongue, pulls out the seat belt, and attaches the seat belt by fitting the tongue to the buckle.

  Here, since the B pillar (center pillar) is a vehicle body structure provided between the front seat and the rear seat, the position adjacent to the backrest portion of the vehicle seat or the rear side in the vehicle longitudinal direction from the backrest portion. It is arranged at the position. Therefore, the guide anchor provided on the B pillar (center pillar) is also disposed at a position adjacent to the backrest portion of the vehicle seat or at a position on the rear side in the vehicle front-rear direction from the backrest portion. Also, since the seat belt before the seat belt is wound by the retractor, the tongue before the seat belt is installed at a position adjacent to the back portion of the vehicle seat or at a position on the rear side in the vehicle longitudinal direction from the back portion. It is in the state that was done. Therefore, when the occupant seated on the seat is wearing the seat belt, the upper body has to be twisted to pull the tongs, and there is a problem that the operability is poor. In addition, it has become a cause of discomfort for passengers who are not good at twisting the upper body (for example, elderly people and pregnant women).

As means for solving such a problem, for example, a seat belt wearing assistance device as described in Patent Document 1 has been proposed. The seat belt wearing assistance device described in Patent Document 1 includes a gripping portion provided on a wearing assistance arm driven by a drive motor, and the gripping portion is in front of the seat back (backrest portion). The drive motor is controlled so as to move the mounting auxiliary arm between the auxiliary position and the retracted position behind the auxiliary position.
JP 2007-45189 A

  However, in the seatbelt wearing assist device described in Patent Document 1, an auxiliary position that is in front of the backrest portion and a retracted position that is in the rear of the auxiliary position so that the wearing assist arm does not interfere with passengers getting on and off. The auxiliary arm is moved between the two. Therefore, an occupant who intends to wear the seat belt must wait until the mounting assist arm moves from the retracted position to the assist position. In addition, if the occupant tries to get off before the mounting auxiliary arm moves from the auxiliary position to the storage position, the mounting auxiliary arm is in the way, so that the occupant moves the mounting auxiliary arm from the auxiliary position to the storage position. You have to wait until you move. The fact that the occupant cannot act as expected in this way causes discomfort to the occupant.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a seat belt device that is excellent in operability and comfort.

  According to the present invention, there is provided a seat belt device for restraining an occupant to a vehicle seat having a seat portion on which the occupant is seated and a backrest portion located on the back surface of the occupant, and is connected to a shoulder portion on the vehicle inner side of the backrest portion. A guide member having a fixed end portion formed, a free end portion projecting forward from the backrest portion, and a cylindrical portion formed from the fixed end portion toward the free end portion; An anchor disposed in the vicinity of the side surface portion, a buckle disposed in the vicinity of the side surface portion on the door side of the seat portion, a retractor that is provided on the vehicle seat and that winds and unwinds the seat belt, and the retractor A seat belt having one end connected and the other end connected to the anchor through the tube portion of the guide member, and disposed between the free end of the guide member of the seat belt and the anchor. Has a tongue, the said restraining the occupant to the vehicle seat by pulling the seat belt connects the tongue to the buckle, the seat belt apparatus is provided, characterized in that. Here, it is preferable that the free end portion of the guide member protrudes forward from the occupant's shoulder in a state of leaning on the backrest portion. Moreover, the part which contacts the passenger | crew of the said guide member may be formed wider than the width | variety of the said seatbelt.

  Moreover, you may comprise the said guide member so that it may have a skin part which ensures the rigidity of the said guide member, and the buffer part arrange | positioned at the side which contacts the passenger | crew of this skin part. In this case, the cylindrical portion of the guide member is formed at any one of the buffer portion, the skin portion, or the skin portion and the buffer portion. Furthermore, the seat belt device may include an airbag that constitutes the buffer portion or is built in the buffer portion, and an inflator that is built in the vehicle seat and supplies gas to the airbag. In addition, an airbag that is inflated and deployed on the surface of the skin portion and an inflator that is built in the vehicle seat and supplies gas to the airbag may be included.

  The fixed end portion of the guide member may be connected to the vehicle seat so as to be rotatable. Further, the fixed end portion of the guide member may be biased in a direction of turning from the door side to the vehicle interior side. The buckle may be provided in front of the occupant's seating position before the tongue connection, and after the tong connection, a buckle drive device may be provided to move backward from the occupant's seating position.

  Further, according to the present invention, there is provided a seat belt device for restraining an occupant to a vehicle seat having a seat portion on which the occupant is seated and a backrest portion located on the back surface of the occupant, the shoulder portion on the vehicle inner side of the backrest portion A guide member having a fixed end portion connected to the free end portion, a free end portion protruding forward from the backrest portion, and a cylindrical portion formed from the fixed end portion toward the free end portion, and a door of the seat portion A buckle disposed in the vicinity of the side surface portion on the side, a retractor provided on the vehicle seat and for winding and unwinding the seat belt, one end connected to the retractor and the other end passing through the cylindrical portion of the guide member A seat belt released into the vehicle and a tong connected to an open end of the seat belt, and the tong is connected to the buckle by pulling out the seat belt. Said restraining an occupant to a vehicle seat, the seat belt apparatus is provided, characterized in that.

  The seat belt device may include a second restraining tool that is disposed at a lower portion of the seat portion or the backrest portion and restrains an occupant's waist or thigh. Such a second restraint is, for example, a pad that can be placed on the waist or thigh of the occupant and can be retracted in the vicinity of the side surface of the vehicle seat, and can be slid in the front-rear direction of the vehicle and can be pressed against the occupant And a pad support device.

  According to the seat belt device of the present invention described above, by providing the guide member protruding forward from the backrest portion, the upper body is pulled to pull the tongue when the occupant seated on the seat portion wears the seat belt. There is no need to twist, and operability and comfort can be improved. In addition, by arranging the guide member on the inside of the vehicle, the guide member does not interfere with getting on and off, and the tongs can be always placed in front of the backrest, so that the seat belt can be placed at the timing that the passenger wants. The operability and comfort can be improved. Furthermore, by arranging the guide member on the inside of the vehicle, in the case of side collision, front collision, oblique collision, etc., against the force to move the occupant in the direction from the door side toward the vehicle interior, The binding force can be improved. In addition, by disposing the front end (free end portion) of the guide member in front of the occupant's shoulder, the seat belt can be more easily mounted, and operability and comfort can be further improved. Further, by making the width of the portion of the guide member that contacts the occupant wider than the width of the seat belt, the contact surface pressure against the occupant can be reduced, and the restraint performance can be improved.

  Moreover, the rigidity for arrange | positioning the front-end | tip (free end part) of a guide member ahead of a passenger | crew's shoulder part can be ensured by providing a skin part in a guide member. Further, since the rigidity of the guide member exerts a force in the direction of separating the seat belt from the occupant when the seat belt is worn, the feeling of tightening the seat belt can be reduced and the comfort can be improved. Further, by providing the guide member with the buffer portion, it is possible to further reduce the feeling of tightening when the seat belt is worn, and to further improve the comfort. Furthermore, the restraint performance at the time of a collision etc. can be improved more by employ | adopting an airbag for a buffer part, and the impact-absorbing power at the time of a collision etc. can be improved by employ | adopting an airbag for an outer skin part. Further, since the fixed end portion of the guide member is made rotatable, the tongue can be easily fitted to the buckle. Furthermore, by urging the fixed end in the direction of turning from the door side toward the vehicle interior, the guide member can automatically face the front when the seat belt is released. Can be improved. In addition, when the buckle drive device is provided, the buckle is arranged in front of the seating position of the occupant, so the tongue can be easily connected to the buckle without twisting the upper body, improving operability Can be made. Further, when the tongue is connected to the buckle, the buckle moves rearward, so that the seat belt can be brought into close contact with the occupant and the restraining performance can be improved.

  In addition, the seat belt device of the present invention can be applied to a two-point seat belt instead of the so-called three-point seat belt, and the two-point seat belt device also has the same effect as described above. Furthermore, in addition to the two-point seat belt, the seat belt device of the present invention is provided with a second restraining device that restrains the occupant's waist or thigh, thereby providing a restraining performance equivalent to or better than that of the three-point seat belt. It can be demonstrated.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. Here, FIG. 1 is a diagram showing a state in which the seat belt device of the present invention is applied to a driver's seat of a vehicle, (A) is a side view, and (B) is a front view.

  The seat belt device shown in FIG. 1 is a seat belt device that restrains an occupant 1 on a vehicle seat 2 that includes a seat 2a on which the occupant 1 is seated and a backrest 2b that is positioned on the back of the occupant 1. A fixed end portion 3a connected to a shoulder portion 2c on the inner side of the vehicle 2b, a free end portion 3b protruding forward from the backrest portion 2b, and a cylindrical portion 3c formed from the fixed end portion 3a toward the free end portion 3b. Provided on the vehicle seat 2, a guide member 3 having an anchor, an anchor 4 disposed in the vicinity of the side surface portion of the seat portion 2 a on the vehicle inner side, a buckle 5 disposed in the vicinity of the side surface portion of the seat portion 2 a on the door side A retractor 6 for winding and unwinding the seat belt 7, a seat belt 7 having one end connected to the retractor 6 and the other end connected to the anchor 4 through the cylindrical portion 3c of the guide member 3, and the seat belt A tongue 8 which is arranged between the guide members 3 of the free end 3b and the anchor 4, and a.

  As shown in FIG. 1A, the guide member 3 has a shape protruding forward from the shoulder of the occupant 1 with its free end 3b leaning against the backrest 2b. By providing the guide member 3, the seat belt 7 or the tongue 8 can be disposed in front of the shoulder of the occupant 1, and the occupant 1 can easily grasp the seat belt 7 or the tongue 8 without twisting the upper body. Can do. Here, FIG. 2 is an explanatory view of the guide member 3, (A) is a top view, (B) is a back view, (C) is a cross-sectional view, and (D) is an upper surface of the guide member provided with an expansion / contraction part. FIG. 5E shows a cross-sectional view of a guide member provided with an airbag mechanism.

  As shown in FIGS. 2A to 2C, the guide member 3 includes an outer skin portion 21 that ensures rigidity, and a buffer portion 22 that is disposed on the side (back side) of the outer skin portion 21 that contacts the occupant 1. Have. The skin portion 21 is made of a material such as resin, for example, and has a rigidity that the free end portion 3b does not bend excessively and a flexibility that does not give the passenger 1 a feeling of strangeness when the seat belt 7 is worn. The rigidity of the skin portion 21 exerts a function of reducing the feeling of tightening of the seat belt 7 because a force in the direction of separating the seat belt 7 from the occupant is applied when the seat belt 7 is worn. Further, the fixed end portion 3a side of the skin portion 21 is formed with a narrow width so that it does not get in the way when the vehicle seat 2 is connected to the shoulder portion 2c and when the seat belt 7 is worn. The portion in contact with the occupant on the side of the portion 3b is formed wider than the seat belt 7 in order to reduce the contact surface pressure against the occupant 1 and improve the restraining performance of the occupant 1. Further, a fastening hole 21 a for fixing to the vehicle seat 2 is formed on the fixed end portion 3 a side of the skin portion 21.

  The buffer portion 22 of the guide member 3 is made of a material such as an elastic cushion material or rubber material, and is sewn to the back side of the skin portion 21 by stitching portions 22a and 22b. In addition, the buffer portion 22 may be made of a material that has good tactile sensation to the occupant 1 (for example, urethane), and a material that has good tactile sensation (for example, velor, velvet, leather, etc.) is sewn on the surface. May be. Here, the stitching portion 22 a is a stitching portion for mainly connecting the skin portion 21 and the buffer portion 22, and the stitching portion 22 b is mainly for passing the seat belt 7 between the skin portion 21 and the buffer portion 22. This is a stitched portion for forming the tube portion 3c. A suture hole for passing a suture thread is formed at a position corresponding to the stitched portions 22a and 22b of the skin portion 21. Moreover, you may make it connect the skin part 21 and the buffer part 22 by fixing means, such as an adhesive agent and a rivet. The cylindrical portion 3c is not limited to being formed between the skin portion 21 and the buffer portion 22, and the skin portion 21 and the buffer portion 22 are processed to be formed on the skin portion or the buffer portion 22. May be.

  Further, as shown in FIG. 2D, the skin portion 21 of the guide member 3 may be provided with an expansion / contraction portion 23 on the fixed end portion 3a side. Here, a bellows mechanism is employed as the expansion / contraction part 23. By providing such a stretchable part 23, the guide member 3 can follow the movement of the seat belt 7 when the seat belt 7 is attached. The stretchable part 23 is not limited to the bellows mechanism, and may be configured by a slide mechanism or a mechanism using a stretchable material.

  Further, as shown in FIG. 2 (E), an air bag mechanism may be provided in the buffer portion 22 of the guide member 3. Here, the airbag mechanism includes an airbag 24 folded and accommodated in the buffer portion 22, an inflator 25 built in the vehicle seat 2, and a supply path 26 for supplying gas from the inflator 25 to the airbag 24. And is composed of. The inflator 25 is connected to an ECU (electronic control unit) (not shown). The inflator 25 is ignited by an ignition current from the ECU, burns the chemical stored in the inflator 25 to generate gas, and supplies the air to the airbag 24. Gas is supplied through the passage 26. The airbag 24 to which the gas is supplied starts to expand in the buffer portion 22, breaks through the buffer portion 22, and expands and deploys as indicated by a one-dot chain line. The airbag 24 is sewn and fixed to the cylinder portion 3c side of the buffer portion 22. Moreover, you may make it form the buffer part 22 itself with an airbag. Further, an air pump may be provided in place of or in addition to the inflator 25 so as to have an air cushion function for controlling the gap between the occupant 1 and the seat belt 7 when the seat belt 7 is worn with the buffer portion 22. Good.

  Next, the fixing structure of the guide member 3 will be described. Here, FIG. 3 is a part development view showing a fixing structure of the guide member 3. As shown in FIG. 3, the fixing structure of the guide member 3 is inserted through the fixed base 31 fixed to the vehicle seat 2, the fixed shaft 32 disposed at the substantially central portion of the fixed base 31, and the fixed shaft 32. The coil spring 33 is connected to the fixed base 31 and the guide member 3, the lid member 34 is used to seal the guide member 3 in the fixed base 31, and the cap 35 is used to fix the lid member 34.

  The fixing base 31 is fixed on the shoulder 2c of the vehicle seat 2 with a bolt or the like, or is embedded and fixed in the vehicle seat 2. A locking hole 31 a for locking the flange 33 a of the coil spring 33 is formed in the outer peripheral portion of the fixed base 31. Further, a notch 31 b for securing an installation space and a rotation space for the guide member 3 is formed on the outer peripheral portion of the fixed base 31. The fixed shaft 32 is erected on the bottom of the fixed base 31, and a screw for screwing the cap 35 is cut at the tip. The coil spring 33 is inserted into the fixed shaft 32 and accommodated in the fixed base 31. A flange 33a is formed at one end of the coil spring 33, and the coil spring 33 is connected to the fixed base 31 by inserting and locking the flange 33a through the locking hole 31a. The other end of the coil spring 33 is fixed to the back side of the skin portion 21 of the guide member 3. Note that a locking hole for inserting the other end of the coil spring 33 is formed in the skin portion 21 of the guide member 3. The guide member 3 is connected to the fixed base 31 by inserting the retaining hole 21a through the fixed shaft 32 in a state where the coil spring 33 is connected. Thereafter, the lid member 34 is inserted through the fixed shaft 32, the cap 35 is screwed onto the tip of the fixed shaft 32, and each component is fixed to the fixed base 31. According to the fixing structure of the guide member 3, the guide spring 3 can be urged in the direction (the urging direction) from the door side toward the vehicle inner side by the action of the coil spring 33, and from the vehicle inner side to the door side. The guide member 3 can be rotated in a direction (rotation direction). Therefore, when the seat belt 7 is mounted, the guide member 3 can be rotated with the movement of the seat belt 7, and the seat belt 7 can be mounted smoothly. Further, when the seat belt 7 is released, the guide member 3 can be automatically oriented forward.

  The anchor 4 can be a part normally used in a conventional seat belt device. For example, as shown in FIG. 1, the anchor 4 includes a fastening portion 4 a connected to the seat belt 7, a fixing portion 4 b for fixing the fastening portion 4 a to the vehicle seat 2, and the fixing portion 4 b to the vehicle seat 2. It is comprised from the fixing tool 4c to fix. Further, a fixing bracket may be connected to the tip of the seat belt 7 so that the fixing bracket is fixed to the vehicle seat 2. In the conventional seat belt device, the anchor is generally provided on the door side of the vehicle seat, but in the seat belt device of the present invention, the anchor 4 is provided on the inner side of the vehicle seat 2.

  The buckle 5 can be a part normally used in a conventional seat belt device. In the conventional seat belt device, the buckle is generally provided inside the vehicle seat, but in the seat belt device of the present invention, the buckle 5 is provided on the door side of the vehicle seat 2. Moreover, the buckle 5 may be connected so that it can slide manually or automatically in the front-back direction of the vehicle, or may be connected so that it can be rotated manually or automatically in the vertical direction. Further, although not shown, a buckle driving device that slides the buckle 5 in the front-rear direction along the vehicle seat 2 may be provided. The buckle driving device is configured by, for example, an air cylinder connected to the buckle 5, a gear mechanism driven by a motor, and the like, and is connected to an ECU (electronic control unit) that receives an ON / OFF signal of the buckle sensor. Has been. When the tongue 8 is not connected to the buckle 5 (when the buckle is OFF), the buckle drive device places the buckle 5 in front of the seating position of the occupant 1 and connects the tongue 8 to the buckle 5. When the vehicle is on (when the buckle is ON), the buckle 5 is moved rearward from the seating position of the occupant 1. By providing such a buckle driving device, the tongue can be easily connected to the buckle without twisting the upper body, the operability can be improved, and the seat belt can be closely attached to the occupant when the seat belt is worn. It is possible to improve the restraint performance.

  The retractor 6 can be a part normally used in a conventional seat belt device. For example, various types such as a spring type retractor, a retractor using both a spring and a motor, and a motor type retractor can be selected and used. In the conventional seat belt device, the retractor is generally provided on the door side of the vehicle seat. However, in the seat belt device of the present invention, the retractor 6 is provided on the inner side of the vehicle seat 2. 1 shows a state in which the retractor 6 is embedded in the backrest portion 2b of the vehicle seat 2, it may be provided on the back surface or side surface portion of the backrest portion 2b, or may be embedded in the seatback portion 2a. You may make it provide in the lower surface of the part 2a.

  The seat belt 7 may be a part that is normally used in a conventional seat belt device. In the conventional seat belt device, the seat belt is disposed on the door side of the vehicle seat, and the seat belt is generally pulled out from the door side and fitted into a buckle inside the vehicle. However, in the seat belt device of the present invention, the seat belt 7 is disposed on the vehicle interior side of the vehicle seat 2, and is configured to be pulled out from the vehicle interior and fitted into the buckle 5 on the door side.

  The tongs 8 can use parts that are normally used in conventional seat belt devices. As shown in FIG. 1, the tongue 8 has an insertion hole for allowing the seat belt 7 to pass therethrough, and is passed through the seat belt 7 between the free end 3 b of the guide member 3 and the anchor 4. When the seat belt 7 is simply passed through the tongue 8, the tongue 8 slides close to the anchor 4, so that it can be held on the seat belt 7 with a force capable of supporting the weight of the tongue 8. It is preferable to keep it. For example, a structure in which a rod member is disposed in the insertion hole of the tongue 8 and the seat belt 7 is hung around the rod member is conceivable.

  Next, the operation of the seat belt device of the present invention will be described. Here, FIG. 4 is a front view for explaining the operation of the seat belt device of the present invention, in which (A) shows before the seat belt is mounted, and (B) shows after the seat belt is mounted.

  As shown in FIG. 4A, the occupant 1 enters the vehicle from the door side and sits on the seat 2 a of the vehicle seat 2. At this time, the guide member 3 is disposed on the vehicle inner side of the vehicle seat 2 and is directed forward by the action of the coil spring 33 shown in FIG. Therefore, the guide member 3 does not interfere with the riding operation of the occupant 1. Further, when the occupant 1 is seated on the seat 2, the seat belt 7 protrudes forward from the shoulder of the occupant 1 as shown in FIG. Therefore, the occupant 1 can easily grasp the seat belt 7 or the tongue 8 only by moving the arm without twisting the upper body when trying to wear the seat belt 7. Then, when the occupant 1 pulls out the seat belt 7 and fits the tongue 8 to the buckle 5, the mounting of the seat belt 7 is completed as shown in FIG. At this time, the guide member 3 is rotated or deformed following the withdrawal of the seat belt 7 and is disposed in a state of covering the chest of the occupant 1. Further, due to the rigidity of the guide member 3, a force acts in the direction of separating the seat belt 7 from the occupant, and the feeling of tightening the seat belt 7 is reduced. Further, since the buffer portion 22 is provided on the back side of the guide member 3, even if the guide member 3 comes into contact with the occupant, the occupant 1 is not discomforted. Further, when the seat belt 7 is released, the occupant 1 may remove the tongue 8 from the buckle 5. The released seat belt 7 is wound up by the action of the retractor 6 and automatically returns to the state shown in FIG. Therefore, the guide member 3 does not get in the way even when the occupant 1 gets out of the door. When the buckle driving device is provided, in the state of FIG. 4A, the buckle 5 is disposed in front of the seating position of the occupant 1, and the tongue 8 can be easily attached to the buckle 5 without twisting the state. Can be connected to. In the state of FIG. 4B, the buckle 5 is moved rearward from the seating position of the occupant, and the restraining performance can be improved mainly by improving the holding force of the lumbar part of the occupant 1.

  Next, a second embodiment of the seat belt device of the present invention will be described. Here, FIG. 5 is a figure which shows 2nd embodiment of the seatbelt apparatus of this invention, (A) is a side view before mounting | wearing, (B) is a front view after mounting | wearing, (C) is 2nd. Pad sectional drawing of a restraint tool, (D) is sectional drawing of the pad which has an air cushion function. In FIG. 5B, a part of the seat 2a is cut away.

  The seat belt device shown in FIG. 5 is a seat belt device that restrains the occupant 1 on a vehicle seat 2 that includes a seat 2a on which the occupant 1 is seated and a backrest 2b that is positioned on the back of the occupant 1. A fixed end portion 3a connected to a shoulder portion 2c on the inner side of the vehicle 2b, a free end portion 3b protruding forward from the backrest portion 2b, and a cylindrical portion 3c formed from the fixed end portion 3a toward the free end portion 3b. A guide member 3, a buckle 5 disposed in the vicinity of the side surface of the seat 2 a on the door side, a retractor 6 that is provided on the vehicle seat 2 and winds and unwinds the seat belt 7, and the retractor 6. A seat belt 7 having one end connected and the other end being released into the vehicle through the cylindrical portion 3c of the guide member 3, a tongue 8 connected to the open end of the seat belt 7, and a occupant disposed on the seat 2a Waist or thigh of the second restraint 50 for restraining the, and a.

  In the second embodiment of the seat belt device, the anchor 4 is removed from the embodiment shown in FIGS. 1 to 4 to change the three-point seat belt to a two-point seat belt, and the second restraint 50. Is added. The structure of the two-point seat belt is the same as the three-point seat belt structure described above, except that the anchor 4 is removed and the tongue 8 is connected to the front end (open end) of the seat belt 7. For this reason, redundant description is omitted here. Hereinafter, the second restraining tool 50 will be described. Depending on the conditions of the type of vehicle, the place where the vehicle is used, the country where the vehicle is used, etc., sufficient restraint performance may be achieved with only the two-point seat belt. The restraint tool 50 is not necessarily provided.

  A second restraint 50 shown in FIGS. 5 (A) and 5 (B) is a pad 51 that can be placed on the waist or thigh of the occupant 1 and can be retracted to the side surface of the seat 2a of the vehicle seat 2. A pad support device 52 that supports the pad 51 so as to be slidable in the front-rear direction of the vehicle and to be able to be pressed against the occupant 1.

  As shown in FIGS. 5B and 5C, the pad 51 includes a lower plate 51a connected to the pad support device 52 and an upper plate 51b slidably connected to the lower plate 51a. Has been. As shown in FIG. 5B, the lower plate 51 a and the upper plate 51 b have a curved shape so as to bulge toward the outside in the width direction of the vehicle seat 2. This is to reduce the distance that the lower end of the lower plate 51a moves toward the outside in the width direction of the vehicle seat 2 when the upper plate 51b is pressed against the occupant 1. Further, as shown in FIGS. 5B and 5C, the lower plate 51a is provided with pinions 51c rotatably at both ends of the tip. On the other hand, the upper plate 51b has a space through which the lower plate 51a can be inserted, and a rack 51d that meshes with the pinion 51c is formed at the stepped portion. A cushioning material 51e such as a cushion material or a rubber material is provided at a portion of the upper plate 51b that comes into contact with the occupant 1.

  The pad support device 52 includes a rail 52a arranged in the seat 2a, a carriage 52b arranged on the rail 52a, an air cylinder 52c fixed on the carriage 52b, and a pad fixed on the carriage 52b. And a support member 52d. The rail 52a extends in the front-rear direction of the vehicle, and the carriage 52b can be moved in the front-rear direction of the vehicle. The carriage 52b includes a wheel or a slider that slides on the rail 52a at the lower part, and is fixed from below at the upper part in the order of the air cylinder 52c and the pad support member 52d. Therefore, when the carriage 52b moves on the rail 52a, the air cylinder 52c and the pad support member 52d also move together. The air cylinder 52 c is fixed on the carriage 52 b so that the rod can be expanded and contracted outward in the width direction of the vehicle seat 2. When the rod is extended by driving the air cylinder 52 c, the rod is disposed so as to contact the lower plate 51 a of the pad 51. Note that the rod of the air cylinder 52c protrudes inward from the long hole 2d formed in the seat 2a shown in FIG. The pad support member 52d is a bar member fixed on the carriage 52b via a fastening member, has a hinge portion at the tip portion, and is configured to be bent at the hinge portion. The tip of the pad support member 52d protrudes from the elongated hole 2e formed in the seat 2a shown in FIG. 5A to the vehicle inner side and is connected to the lower plate 51a of the pad 51. Therefore, when the lower plate 51a of the pad 51 is pressed by the air cylinder 52c, the lower plate 51a rotates about the hinge portion of the pad support member 52d, and accordingly, the upper plate 51b can be pressed against the occupant 1.

  A method for mounting the second restraint 50 described above will be described. As shown in FIG. 5A, the occupant 1 seated on the seat 2a of the vehicle seat 2 grabs the pad 51 and slides the second restraint 50 to an arbitrary position (for example, a position indicated by a broken line). Let Thereafter, the upper plate 51b of the pad 51 is slid as shown by a broken line in FIG. When the upper plate 51b is slid to a predetermined position, a sensor (not shown) reacts to fix the carriage 52b on the rail 52a and drive the air cylinder 52c. When the air cylinder 52c is driven, the rod of the air cylinder 52c extends and the tip presses the lower plate 51a. As shown by the solid line in FIG. 5B, the pressed lower plate 51a rotates around the hinge portion of the pad support member 52d and presses the upper plate 51b against the occupant 1. When a predetermined load is applied to the air cylinder 52c, the air cylinder 52c stops and maintains a state where the lower plate 51a is pressed. The passenger 1 is restrained by the vehicle seat 2 by the action of the second restraining tool 50. The seat belt 7 may be attached before the second restraint 50 is attached or after the second restraint 50 is attached. When releasing the second restraint 50, it is only necessary to slide the upper plate 51b. When the upper plate 51b is slid to a predetermined position, a sensor (not shown) reacts to release the carriage 52 and retract the rod of the air cylinder 52c. When the rod of the air cylinder 52c is retracted, the lower plate 51a can freely rotate around the hinge portion of the pad support member 52d and is moved to the position indicated by the broken line in FIG. Finally, the upper plate 51b is accommodated on the lower plate 51a and can be returned to the initial state shown by the solid line in FIG.

  Further, the pad 51 is not limited to the shape shown in FIG. 5C, and may be one having an air cushion function as shown in FIG. 5D. The pad 51 shown in FIG. 5 (D) has a substantially U-shape in which one surface of the upper plate 51b is opened, and a rack 51d is formed at a step portion formed in the recess. An airbag 51f is disposed at the bottom of the recess, and the airbag 51f is connected to an air pump (not shown) disposed in the seat 2a. When the second restraint 50 is mounted, when the upper plate 51b is slid to a predetermined position, a sensor (not shown) reacts, air is supplied from the air pump into the airbag 51f, and the airbag 51f is indicated by a broken line. It is supposed to expand. On the contrary, when the second restraint 50 is released, when the upper plate 51b is slid to a predetermined position, a sensor (not shown) reacts and the air in the airbag 51f is extracted by the air pump. Further, the pad 51 may be provided with an airbag function. In the case of the pad 51 shown in FIG. 5C, the folded airbag is housed in the cushioning material 51e, and an inflator for supplying gas to the airbag is disposed in the lower plate 51a or the seat 2a. You can do it. In the case of the pad 51 shown in FIG. 5D, an inflator that supplies gas to the airbag 51f may be disposed in the lower plate 51a or the seat 2a.

  Next, a third embodiment of the seat belt device of the present invention will be described. Here, FIG. 6 is a view showing a third embodiment of the seat belt device of the present invention, (A) is a side view before wearing, and (B) is a front view after wearing. In FIG. 6B, a part of the seat 2a is cut out. The seat belt device shown in FIG. 6 differs from the second embodiment of the seat belt device shown in FIG. 5 only in the structure of the second restraint, and therefore the second restraint 60 shown in FIG. explain.

  A second restraint 60 shown in FIGS. 6A and 6B includes a pad 61 that can be disposed on the waist or thigh of the occupant 1 and can be retracted to the side surface of the seat 2a of the vehicle seat 2. And a pad support device 62 that supports the pad 61 so as to be slidable in the front-rear direction of the vehicle and to be able to be pressed against the occupant 1. The pad support device 62 has the same structure as the pad support device 52 shown in FIG.

  The pad 61 includes a lower plate 61a connected to the pad support device 62 and an upper plate 61b connected to the lower plate 61a so as to be rotatable. As shown in FIG. 6B, the lower plate 61a and the upper plate 61b are formed in a flat plate shape and are connected via a hinge portion 61c. The hinge portion 61c has a ratchet mechanism or a stopper mechanism, and is configured to be able to maintain and release the bent state of the upper plate 61b. Further, a cushioning material 61d such as a cushion material or a rubber material is provided at a portion of the upper plate 61b that contacts the occupant 1. It should be noted that the hinge portion that connects the pad support member 52d of the pad support device 62 and the lower plate 61a has a direction in which the pad 61 is erected as shown in FIG. 6 (A) and as shown in FIG. 6 (B). The pad 61 is configured by a component (for example, a universal joint or the like) that can rotate in two directions in which the pad 61 approaches the occupant 1 side.

  A method for mounting the second restraint 60 will be described. As shown in FIG. 6A, the occupant 1 seated on the seat 2a of the vehicle seat 2 grabs the pad 61 and slides the second restraint 60 to an arbitrary position. Thereafter, as shown by a broken line in FIG. 6A, the pad 61 is rotated so as to stand substantially perpendicular to the bottom surface of the vehicle. When the pad 61 is rotated to a predetermined angle, a sensor (not shown) reacts to fix the carriage 62b on the rail 62a. Furthermore, the occupant 1 rotates the upper plate 61b so as to approach the waist or thigh. When the upper plate 61b is rotated by a predetermined angle with respect to the lower plate 61a, a sensor (not shown) reacts to drive the air cylinder 62c. When the air cylinder 62c is driven, the rod of the air cylinder 62c extends and the tip presses the lower plate 61a. The pressed lower plate 61a rotates around the hinge portion of the pad support member 62d as shown by the solid line in FIG. 6B, and presses the upper plate 61b against the occupant 1. When a predetermined load is applied to the air cylinder 62c, the air cylinder 62c stops and keeps pressing the lower plate 61a. The passenger 1 is restrained by the vehicle seat 2 by the action of the second restraining tool 60. The seat belt 7 may be attached before the second restraint 60 is attached or after the second restraint 60 is attached. When releasing the second restraint 60, it is only necessary to rotate the upper plate 61b away from the occupant 1. When the upper plate 61b is rotated by a predetermined angle, a sensor (not shown) reacts to retract the rod of the air cylinder 52c. Further, when the pad 61 is rotated by a predetermined angle with respect to the bottom surface of the vehicle, a sensor (not shown) reacts to release the carriage 62 from being fixed. Finally, the pad 61 is housed in the side surface of the seat 2a and can be returned to the initial state shown by the solid line in FIG.

  Next, a fourth embodiment of the seat belt device of the present invention will be described. Here, FIG. 7 is a view showing a fourth embodiment of the seat belt device of the present invention, (A) is a side view before wearing, and (B) is a front view after wearing. The seat belt device shown in FIG. 7 differs from the second embodiment of the seat belt device shown in FIG. 5 only in the structure of the second restraint, and therefore the second restraint 70 shown in FIG. explain.

  A second restraint 70 shown in FIGS. 7A and 7B includes a pad 71 that can be disposed on the waist or thigh of the occupant 1 and can be retracted in the vicinity of the side surface of the backrest 2b of the vehicle seat 2. The pad support device 72 supports the pad 71 so as to be slidable in the front-rear direction of the vehicle and to be able to be pressed against the occupant 1.

  The pad support device 72 is composed of an air cylinder with a motor. The rod 72a can be expanded and contracted in the longitudinal direction of the vehicle by an air cylinder function, and the rod 72a can be rotated around the axis by a motor function. It can be done. The rod 72a is formed in a substantially L shape with a tip bent substantially vertically. The bent tip of the rod 72a constitutes a pad 71. A cushioning material 71 a such as a cushion material or a rubber material is provided at a portion of the pad 71 that contacts the occupant 1. The rod 72a is not limited to a substantially L shape, and may be a substantially J shape.

  A method for mounting the second restraint 70 will be described. As shown in FIG. 7A, when the occupant 1 is seated on the seat 2a of the vehicle seat 2, a sensor (not shown) reacts, and the rod 72a is extended as shown by a broken line in FIG. 7A. The pad 71 is moved in the forward direction of the vehicle. When the pad 71 moves to a position where it passes through the abdomen of the occupant 1, a sensor (not shown) reacts to stop the extension of the rod 72a. When the rod 72a is stopped, the motor of the pad support device 72 is operated to rotate the pad 71 in the direction approaching the occupant 1 as shown by the solid line in FIG. When a predetermined load is applied to the motor, the motor stops. In this state, the rod 72a may be retracted to bring the pad 71 into close contact with the occupant 1. In this case, the retraction of the rod 72a may be stopped when a predetermined load is generated in the air cylinder. The passenger 1 is restrained by the vehicle seat 2 by the action of the second restraining tool 70. The seat belt 7 may be attached before the second restraint 70 is attached or after the second restraint 70 is attached. When releasing the second restraint tool 70, the rod 72a is rotated to move the pad 71 to the position indicated by the broken line in FIG. 7B, and then the rod 72a is retracted. Finally, the pad 71 is housed in the vicinity of the side surface of the backrest 2b, and can be in the state shown by the solid line in FIG.

  Next, a fifth embodiment of the seat belt device of the present invention will be described. Here, FIG. 8 is a view showing a fifth embodiment of the seat belt device of the present invention, (A) is a side sectional view of a guide member, and (B) shows a first modification of the fifth embodiment. Side surface sectional drawing of a guide member, (C) is a side surface sectional view of the guide member which shows the 2nd modification of 5th embodiment.

  The fifth embodiment shown in FIGS. 8 (A) to 8 (C) and the modification thereof are applied to the airbag 81 that is inflated and deployed on the surface of the skin portion 21 of the guide member 3 shown in FIG. An airbag mechanism having an inflator 82 that is built in and supplies gas to the airbag 81 is provided. By attaching such an airbag mechanism, the airbag 81 can be inflated and deployed on the upper part of the skin portion 21 when a vehicle collision is detected or predicted, so that the impact absorbing power against the head of the occupant 1 is improved. In particular, it works effectively when the vehicle collides. In addition, about the other structure of the seatbelt apparatus which is not illustrated in each figure, what was shown in 1st embodiment-4th embodiment of this invention can be used suitably.

  The airbag mechanism of the fifth embodiment shown in FIG. 8A includes an airbag 81 that is inflated and deployed on the surface of the skin portion 21, an inflator 82 that is built in the vehicle seat 2, and the airbag 81 to the airbag 81. The airbag 81 is folded and accommodated in a casing 84 disposed in the vicinity of the fixed end portion 3a of the guide member 3. The casing 84 is, for example, a resin box, and is fixed to the surface of the skin portion 21. By fixing the casing 84 to the surface of the skin portion 21, the protruding direction of the airbag 81 can be changed in accordance with the movement of the guide member 3. Further, a thin groove (tear line) for facilitating the protrusion of the airbag 81 is formed on the front surface (protruding port) of the casing 84. Further, the size of the casing 84 may be formed so as to include the fixed base 31 as illustrated, or may be arranged in front of the fixed base 31, or the fixed base 31 and the casing 84 may be arranged. May be formed as an integrally molded product. The airbag 81 may be stored by being folded directly in a storage portion formed in the casing 84 or may be stored in the casing 84 after being stored in a retainer. Further, the airbag 81 may be folded by combining bellows folding and roll folding as illustrated, or may be bellows folding, roll folding, or inward folding only. The inflator 82 is connected to an ECU (electronic control unit) (not shown). The inflator 82 is ignited by an ignition current from the ECU, burns a chemical stored in the inflator 82, generates gas, and supplies the air to the airbag 81. Gas is supplied via the path 83. The airbag 81 supplied with the gas protrudes from the casing 84 and is inflated and deployed as shown by a one-dot chain line.

  In the first modification of the fifth embodiment shown in FIG. 8B, the airbag 81 is directly arranged on the surface of the skin portion 21. The airbag 81 used here is an inflatable body made of a stretchable material, which normally maintains a flat plate shape and is inflated as indicated by a one-dot chain line when gas is supplied to the inside. The The airbag 81 may be fixed to the skin portion 21 by a fixing tool such as a bolt, may be fixed by sewing, or may be fixed by an adhesive. Further, the feeding path 83 may be connected to the airbag 81 through the retaining hole 21a of the guide member 3, or may be connected from the rear side of the guide member 3 as shown in FIG. Good. The airbag 81 may be made of a normal airbag material, and a pad that accommodates the airbag 81 may be fixed to the surface of the skin portion 21. In this case, the pad may be formed of a stretchable material and the airbag 81 may be inflated inside, or the airbag 81 may be inflated and deployed by breaking through the pad.

  In the second modification of the fifth embodiment shown in FIG. 8C, the airbag 81 is housed inside the guide member 3. A storage space 21b for storing the airbag 81 is formed inside the guide member 3, and the airbag 81 is stored inside the storage space 21b. In addition, a thin groove (tear line) for facilitating the protrusion of the airbag 81 is formed on the back surface at a position corresponding to the accommodation space 21 b of the skin portion 21. Further, although not shown, the back surface of the skin portion 21 (the surface on the buffer portion 22 side) is configured to be able to open and close the accommodation space 21b by a lid member or the like so that the airbag 81 can be accommodated. Even in such an airbag mechanism, when gas is supplied to the airbag 81, the airbag 81 can be inflated and deployed as shown by a one-dot chain line.

  The present invention is not limited to the above-described embodiment, and the present invention can be applied to a seat belt device for a passenger seat or a rear seat, and an annular support member that can guide the seat belt 7 instead of the buffer portion 22. Various modifications can be made without departing from the spirit of the present invention, such as the release of the second restraint may be performed based on the buckle OFF signal of the buckle sensor. Of course.

It is a figure which shows the state which applied the seatbelt apparatus of this invention to the driver's seat of the vehicle, (A) is a side view, (B) is a front view. It is explanatory drawing of the guide member 3, (A) is a top view, (B) is a back view, (C) is sectional drawing, (D) is a top view of the guide member provided with the expansion-contraction part, (E) is air Sectional drawing of the guide member provided with the bag mechanism is shown. FIG. 4 is a part development view showing a method for fixing the guide member 3. It is a front view explaining the effect | action of the seatbelt apparatus of this invention, (A) is before seatbelt mounting, (B) has shown after seatbelt mounting. It is a figure which shows 2nd embodiment of the seatbelt apparatus of this invention, (A) is a side view before mounting | wearing, (B) is a front view after mounting | wearing, (C) is pad sectional drawing of a 2nd restraint tool, (D) is sectional drawing of the pad which has an air cushion function. It is a figure which shows 3rd embodiment of the seatbelt apparatus of this invention, (A) is a side view, (B) is a front view. It is a figure which shows 4th embodiment of the seatbelt apparatus of this invention, (A) is a side view, (B) is a front view. It is a figure which shows 5th embodiment of the seatbelt apparatus of this invention, (A) is side surface sectional drawing of a guide member, (B) is side surface sectional drawing of the guide member which shows the 1st modification of 5th embodiment, (C) is side surface sectional drawing of the guide member which shows the 2nd modification of 5th embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Passenger 2 Vehicle seat 2a Seat back part 2b Backrest part 2c Shoulder part 2d, 2e Long hole 3 Guide member 3a Fixed end part 3b Free end part 3c Cylindrical part 4 Anchor 4a Fastening part 4b Fixing part 4c Fixing tool 5 Buckle 6 Retractor 7 Seat Belt 8 Tongue 21 Skin part 21a Fastening hole 21b Accommodating space 22 Buffer part 22a, 22b Stitching part 23 Stretching part 24, 81 Air bag 25, 82 Inflator 26, 83 Feeding path 31 Fixing base 31a Locking hole 31b Notch part 32 Fixation Shaft 33 Coil spring 33a Hook 34 Lid member 35 Cap 50, 60, 70 Second restraint 51, 61, 71 Pad 51a, 61a Lower plate 51b, 61b Upper plate 51c Pinion 51d Rack 51e, 61d, 71a Buffer 51f Air Bag 52, 62, 72 Pad Lifting device 52a, 62a rails 52 b, 62b trolley 52c, 62c air cylinder 52 d, 62d pad supporting member 61c hinge 72a rod 84 casing

Claims (13)

A seat belt device for restraining an occupant to a vehicle seat having a seat portion on which the occupant sits and a backrest portion located on the back of the occupant,
A fixed end portion connected to a shoulder portion on the vehicle interior side of the backrest portion, a free end portion protruding forward from the backrest portion, and a cylindrical portion formed from the fixed end portion toward the free end portion. A guide member, an anchor disposed in the vicinity of the side surface of the seat portion on the vehicle inner side, a buckle disposed in the vicinity of the side surface portion of the seat portion on the door side, and a seat belt that is provided on the vehicle seat and winds up the seat belt And a retractor for rewinding, a seat belt having one end connected to the retractor and the other end connected to the anchor through the tubular portion of the guide member, the free end portion of the guide member of the seat belt, and the seat belt A tong disposed between the anchors, and pulling out the seat belt and connecting the tong to the buckle to restrain an occupant in the vehicle seat; Seat belt apparatus according to symptoms.   2. The seat belt device according to claim 1, wherein the free end portion of the guide member protrudes forward from an occupant's shoulder leaning against the backrest portion. 3.   2. The seat belt device according to claim 1, wherein a portion of the guide member that comes into contact with an occupant is formed wider than a width of the seat belt.   The seat belt device according to claim 1, wherein the guide member includes a skin portion that ensures the rigidity of the guide member, and a buffer portion that is disposed on a side of the skin portion that contacts an occupant. .   The seat belt device according to claim 1, wherein the cylindrical portion of the guide member is formed at any one of the buffer portion, the skin portion, or between the skin portion and the buffer portion.   5. The airbag according to claim 4, further comprising: an airbag that constitutes the buffer portion or is built in the buffer portion; and an inflator that is built in the vehicle seat and supplies gas to the airbag. Seat belt device.   The seatbelt device according to claim 4, further comprising: an airbag that is inflated and deployed on a surface of the skin portion; and an inflator that is built in the vehicle seat and supplies gas to the airbag. .   The seat belt device according to claim 1, wherein the fixed end portion of the guide member is rotatably connected to the vehicle seat.   The seat belt device according to claim 8, wherein the fixed end portion of the guide member is biased in a direction of rotating from the door side to the vehicle interior side.   2. The buckle drive device according to claim 1, further comprising a buckle driving device that is disposed in front of an occupant's seating position before the tongue connection and that moves to the rear of the occupant's seating position after the tongue connection. The seat belt device according to the description. A seat belt device for restraining an occupant to a vehicle seat having a seat portion on which the occupant sits and a backrest portion located on the back of the occupant,
A fixed end portion connected to a shoulder portion on the vehicle interior side of the backrest portion, a free end portion protruding forward from the backrest portion, and a cylindrical portion formed from the fixed end portion toward the free end portion. A guide member, a buckle disposed in the vicinity of a side portion of the seat on the door side, a retractor provided on the vehicle seat and for winding and unwinding a seat belt, and one end connected to the retractor, the other end Has a seat belt released into the vehicle through the cylindrical portion of the guide member, and a tongue connected to the open end of the seat belt, and the seat belt is pulled out to connect the tongue to the buckle. By doing so, a passenger is restrained to the vehicle seat.   The seat belt device according to claim 11, further comprising a second restraining device that is disposed on the seat portion or the backrest portion and restrains an occupant's waist portion or thigh portion. The second restraint is disposed on the waist or thigh of the occupant and can be retracted near the side of the vehicle seat, and the pad can be slid in the front-rear direction of the vehicle and supported by the occupant. The seat belt device according to claim 12, further comprising: a pad support device that performs the operation.