JP2009057019A - Seat belt device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt device capable of materializing the optimum control of a force limiter mechanism according to a use state of a seat belt. <P>SOLUTION: When only three-point type seat belt 10 is installed, in a case that a load not less than a first predetermined value is acted, a three-point side force limiter mechanism is acted. When a two-point type seat belt 20 is installed in addition to the three-point seat belt 10, in a case that a load related to a second predetermined value lower than the first predetermined value, the three-point side force limiter mechanism is actuated and a two-point side force limiter mechanism additionally installed is cooperatively acted. The load actuating the force limiter mechanism is optimally controlled according to an installation state of the seat belt, so that safety can be further improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seat belt device having a first seat belt and a second seat belt.

  Conventionally, seat belts attached to automobiles include a four-point seat belt in which a two-point seat belt is combined with a three-point seat belt in addition to the three-point seat belt. The four-point seat belt is used for a competition vehicle or the like because it has a high holdability at the time of a collision (see, for example, Patent Documents 1 to 3). In addition, there is a four-point seat belt that is used by crossing two two-point seat belts arranged opposite to each other.

By the way, recent vehicles are equipped with a pretensioner mechanism that raises the seat belt instantaneously and enhances the occupant's restraining effect when an impact of a set level or more is detected during a collision from the front of the vehicle. In addition to the pretensioner mechanism, a force limiter mechanism is also installed. The force limiter mechanism absorbs a force applied to a seat belt when a load of a set level or higher is applied to the seat belt, and maintains a restraint force of the seat belt appropriately to reduce a burden on the chest (for example, refer to Patent Document 4 or 5). .
Japanese Utility Model Publication No. 62-23755 JP 2004-330975 A US Patent Application Publication No. 2002/89163 JP 2001-354111 A Special table 2003-502204 gazette

  However, there is a problem that it is necessary to appropriately control the force limiter mechanism in accordance with the number of seat belts to be mounted to further improve safety. Patent Documents 1 to 5 do not describe any means for solving such a problem.

  The present invention has been made in view of such circumstances, the purpose of which is to optimize the load of the force limiter mechanism according to the mounting state of a plurality of seat belts, An object of the present invention is to provide a seat belt device capable of realizing an optimal control of a force limiter mechanism.

  Another object of the present invention is to provide a seat belt device capable of evenly restraining both shoulders with a simple configuration and stably restraining the lower body.

  The seat belt device according to the present invention is a seat belt device having a first seat belt and a second seat belt, wherein the first detection means for detecting the wearing state of the first seat belt and the wearing state of the second seat belt. And a first force limiter mechanism that absorbs the rotational force in the pulling-out direction of the webbing of the first seat belt when a load of a first predetermined value or more is applied to the first seat belt. The second force limiter mechanism that absorbs the rotational force in the pull-out direction of the webbing of the second seat belt when a load of a second predetermined value or more is applied to the second seat belt, and the first detection means When the wearing of the first seat belt is detected and the wearing of the second seat belt is detected by the second detection means, the first predetermined value is decreased. Characterized in that it comprises a reducing means for.

  In the seat belt device according to the present invention, the first seat belt is a three-point seat belt, and the second seat belt is a two-point seat belt.

  The seat belt device according to the present invention can be fixed to a seat or a vehicle body, and is provided at an anchor portion having a guide portion for guiding the webbing of the three-point seat belt, and at one end of the webbing of the three-point seat belt, A first engagement portion that comes into contact with the anchor portion as the webbing moves, and a second engagement portion that is provided at one end of the webbing of the two-point seat belt and engages with the first engagement portion. It is characterized by that.

  In the seatbelt device according to the present invention, the first seatbelt and the second seatbelt are two-point seatbelts, and the reducing means detects the wearing of the first seatbelt by the first detecting means. In addition, when the second detection means detects the wearing of the second seat belt, the first predetermined value and the second predetermined value are reduced.

  In the present invention, the first detecting means detects the wearing state of the first seat belt, and similarly, the second detecting means detects the wearing state of the second seat belt. The first force limiter mechanism corresponding to the first seat belt absorbs the rotational force in the webbing pull-out direction when a load of a first predetermined value or more is applied to the first seat belt. Similarly, the second force limiter mechanism corresponding to the second seat belt absorbs the rotational force in the webbing pull-out direction when a load of a second predetermined value or more is applied to the second seat belt. Here, when the reducing means detects the wearing of the first seat belt by the first detecting means and detects the wearing of the second seat belt by the second detecting means, the first predetermined value is reduced. Thereby, the load at which the first force limiter mechanism operates is reduced.

  For example, the first seat belt is a three-point seat belt, and the second seat belt is a two-point seat belt. Here, an anchor portion having a guide portion for guiding the webbing of the three-point seat belt is fixably provided on the seat or the vehicle body. The first engagement portion is provided at one end of the webbing of the three-point seat belt, and abuts on the anchor portion as the webbing moves. The second engagement portion is provided at one end of the webbing of the two-point seat belt and engages with the first engagement portion.

  When the first seat belt and the second seat belt are two-point seat belts, the reducing means detects the wearing of the first seat belt by the first detecting means, and the second detecting means detects the second seat belt. When mounting is detected, the first predetermined value and the second predetermined value are reduced.

  In the present invention, when only the first seat belt is attached, the force limiter mechanism operates when a load greater than or equal to the first predetermined value is applied. When the second seat belt is mounted in addition to the first seat belt, the first force limiter mechanism operates and is mounted together when a load lower than the first predetermined value is applied. The second force limiter mechanism also operates in cooperation. As described above, since the load at which the force limiter mechanism operates is optimally controlled in accordance with the seat belt wearing state, it is possible to further improve safety. Further, since the force limiter mechanism is controlled in accordance with the number of seat belts, it is possible to select one seat belt or two seat belts according to the driver's intention.

  In the present invention, the first engagement portion that comes into contact with the anchor portion as the webbing of the three-point seat belt moves is engaged with the second engagement portion provided at one end of the webbing of the two-point seat belt. Therefore, the lower body of the occupant can be restrained in a balanced manner by the interaction between the winding of the webbing of the two-point seat belt and the winding of the webbing of the three-point seat belt. Further, since the webbing of the two-point seat belt and the webbing of the three-point seat belt are integrally engaged, it is possible to simplify the winding control of each retractor.

  In the present invention, when the first seat belt and the second seat belt are two-point seat belts, the reducing means reduces the first predetermined value and the second predetermined value, so that the optimum number according to the number of wearing is optimal. The present invention has an excellent effect such that the force limiter mechanism can be controlled.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic front view showing a configuration of a seat belt device according to the present invention, and FIG. 2 is a schematic front view showing a state in which an occupant wears a three-point seat belt. As shown in FIG. 1, the seat belt device 100 is disposed on the left side in the seating direction (hereinafter, the other side) opposite to the two-point seat belt 20 disposed on the left side (hereinafter, the one side) in the seating direction. A three-point seat belt 10 is used.

  The three-point seat belt 10 includes a three-point retractor 11 fixed to a B-pillar 3 that is a vehicle body, a webbing (hereinafter referred to as a three-point belt) 12, a three-point guide portion (hereinafter referred to as a shoulder anchor) 13, and three points. The side tongue 14, the anchor portion 17 including the guide portion 171, the three-point side buckle 15, and the three-point side buckle plate 16 are configured. On the other hand, the two-point seat belt 20 includes a two-point retractor 21, a webbing (hereinafter, two-point belt) 22, a two-point guide portion 23, a second engagement portion 25, and a first engagement portion 24. Is done.

  The three-point side retractor 11 is fixed inside the B pillar 3 on the other side, and winds the drawn three-point side belt 12. A shoulder anchor 13 is suspended from the top of the B pillar 3 to guide the extension of the three-point side belt 12 into the vehicle and the winding into the B pillar 3. Note that the three-point retractor 11 may be fixed inside a C pillar (not shown). A first engagement portion 24 is attached to one end of the three-point belt 12. The first engagement portion 24 can use a tongue or a buckle. In the present embodiment, a tongue is applied to the first engagement portion 24, and the first engagement portion 24 will be described as a two-point side tongue 24 below.

  An anchor portion 17 having a guide portion 171 is fixed to the seat cushion 1 or the other lower portion of the vehicle body, and the three-point side belt 12 is provided on the anchor portion 17 fixed to the seat cushion 1. To move. By winding the three-point belt 12 by the three-point retractor 11, the two-point tongue 24 provided at one end of the three-point belt 12 is lowered toward the anchor portion 17, and the three-point belt 12 and the two-point tongue 24. Is lowered when the two-point tongue 24 and the guide portion 171 of the anchor portion 17 contact each other. Between the shoulder anchor 13 and the anchor part 17, a three-point side tongue 14 in which an elongated hole for guiding the three-point side belt 12 is formed is movably provided.

  A three-point buckle plate 16 is fixed to one lower part of the seat cushion 1 or the vehicle body, and a three-point buckle 15 is connected to the opposite side of the fixed position of the three-point buckle plate 16. . The three-point side tongue 14 engages with a three-point side buckle 15 provided at the lower part on one side across the seat back 2 from above the other side. A procedure for attaching the three-point seat belt 10 to the occupant M will be described with reference to FIG. The occupant M holds the three-point side tongue 14 suspended from the upper part on the other side of the seat back 2, and moves the three-point side tongue 14 from the right shoulder to the left waist.

  Then, the moved three-point side tongue 14 is engaged with the three-point side buckle 15 fixed by the three-point side buckle plate 16 at the lower part on one side of the seat back 2. As a result, the three-point belt 12 is restrained by the shoulder belt portion 5 that intersects the left waist from the right shoulder of the occupant M, and the lap belt portion 4 that crosses both legs and the lower abdomen from the other side to the one side. Restrain the lower body. In this case, the three-point side retractor 11 sends the three-point side belt 12 into the vehicle via the shoulder anchor 13 by pulling the three-point side tongue 14 of the occupant M. One end of the three-point side belt 12 is moved from the other side to the one side via the guide portion 171 of the anchor portion 17 by pulling the three-point side tongue 14 of the occupant M, and the two-point side tongue 24 is moved to the anchor portion 17. The movement is stopped when it abuts against the guide portion 171. Thereby, the restraint of the occupant M is realized by the three-point support by the shoulder anchor 13 and the anchor portion 17 on the other side and the three-point side buckle 15 on one side.

  As shown in FIG. 1, the two-point retractor 21 of the two-point seat belt 20 is embedded in the seat back 2 and winds up the two-point belt 22. A second engagement portion 25 is provided at one end of the two-point side belt 22, and the second engagement portion 25 is moved to one side of the seat back 2 by winding the two-point side belt 22 of the two-point side retractor 21. It abuts on the two-point guide portion 23 fixed upward. The two-point side guide portion 23 is installed on the seat back 2 such that a rectangular opening that guides the two-point side belt 22 wound inside the seat back 2 or pulled out faces the seating direction. . In the present embodiment, the second engagement portion 25 is described as being a two-point buckle 25. The two-point side buckle 25 is engaged with a two-point side tongue 24 provided at the lower part on the other side of the seat cushion 1. In this case, the two-point side belt 22 is pulled out from the two-point side retractor 21 and sent out to the outside of the seat back 2 via the two-point side guide portion 23.

  FIG. 3 is an enlarged view showing an engagement state between the two-point side tongue 24 and the two-point side buckle 25. The engagement between the two-point side tongue 24 and the two-point side buckle 25 will be described with reference to FIG. The anchor portion 17 is a T-shaped plate and includes a fixing portion 172 and a guide portion 171. The anchor portion 17 is fixed to the vehicle body or the seat cushion 1 by a fixing portion 172 such as a bolt located at a substantially lower center portion of the lower side, and the anchor portion 17 rotates around a predetermined angle about the fixing portion 172. A horizontally long hole-shaped guide portion 171 is formed on the anchor portion 17 and guides the three-point belt 12 to the guide portion 171 so as to be movable. In the present embodiment, the anchor portion 17 is fixed by screwing a fixing portion 172 such as a bolt on the lower side of the seat cushion 1 or the vehicle body, but the anchor portion 17 is fixed as will be described later. You may make it removable from the seat cushion 1 or the other side lower part of a vehicle body.

  The two-point tongue 24 is a T-shaped plate and includes a guide portion 242 and an engagement hole 241. A square-shaped engagement hole 241 is formed at the substantially central portion of the tip of the two-point side tongue 24, and the two-point side tongue 24 is moved in the engagement direction indicated by the white arrow to the two-point side buckle 25. When inserted, the locking portion (not shown) inside the two-point buckle 25 is engaged with the engagement hole 241 and the two-point buckle 25 and the two-point tongue 24 are engaged. By pressing a release button 251 provided on the two-point side buckle 25, the engagement between the lock portion (not shown) and the engagement hole 241 is released, and the engagement between the two-point side buckle 25 and the two-point side tongue 24 is also released. The

  At the position facing the engagement hole 241 of the two-point side tongue 24, a horizontally elongated guide portion 242 is formed. The tip of the three-point side belt 12 is guided to the guide part 171 of the anchor part 17 and the guide part 242 of the two-point side tongue 24, is folded back by the guide part 242, and the tip is sewn to the three-point side belt 12 with a thread. It is inserted or fixed with an adhesive to form a loop connecting the guide portions 242. The guide portion 242 of the two-point side tongue 24 is configured to be the same as or larger than the guide portion 171 of the anchor portion 17. Thereby, even when the three-point side belt 12 is wound, the guide part 242 of the two-point side tongue 24 and the guide part 171 of the anchor part 17 come into contact with each other, and the movement thereof is limited.

  FIG. 4 is a schematic front view showing the configuration of the seat belt device 100 according to the present invention, FIG. 5 is a schematic side view showing the configuration when the seat belt device 100 according to the present invention is viewed from the left side in the occupant M seating direction, FIG. 6 is a schematic side view showing a configuration when the seat belt device 100 according to the present invention is viewed from the right side in the occupant M seating direction. A procedure for further mounting the two-point seat belt 20 after mounting the three-point seat belt 10 shown in FIG. 2 will be described with reference to FIGS.

  The occupant M grips the two-point side buckle 25 at the left shoulder position after the three-point seat belt 10 is worn, and pulls out the two-point side buckle 25 from the left shoulder toward the right waist. The shoulder belt portion 6 of the two-point seat belt 20 crosses the upper portion of the two-point seat belt 20 across the portion 5, and the two-point side buckle 25 is engaged with the two-point side tongue 24. As a result, the two-point seat belt 20 and the three-point seat belt 10 are connected. In this embodiment, the three-point seat belt 10 is attached first, but the two-point seat belt 20 may be attached first.

  Before the occupant M wears the two-point seat belt 20, the two-point buckle 25 is in contact with the two-point side guide portion 23 above the seat back 2 by winding the two-point retractor 21. . When the two-point side buckle 25 is pulled out, the two-point side belt 22 is sent out from the two-point side retractor 21 via the two-point side guide portion 23. The two-point belt 22 guided to the two-point side buckle 25 crosses the shoulder belt portion 5 of the three-point side belt 12 from the left shoulder to the right waist of the occupant M to form the shoulder belt portion 6. The two-point buckle 25 engages with the two-point side tongue 24. In the present embodiment, the example in which the seat belt device 100 is applied to the right seat of the automobile has been described. However, the components of the two-point seat belt 20 and the three-point seat belt 10 are arranged on the opposite sides. Of course, the same applies to the left seat. Furthermore, the same seat belt device 100 may be used for the left and right rear seats.

  Next, load control will be described. FIG. 7 is a block diagram illustrating a hardware configuration of a seat belt apparatus that performs load control processing. The load control is executed by the control unit 41, the RAM 46, the 2-point side buckle switch 44, the 3-point side buckle switch 45, the display unit 48, the 3-point side force limiter mechanism 43, the 3-point side switch 431, and the like. A control unit 41 such as an ECU (electronic control unit) is connected to each part of hardware via a transmission line by CAN (Controller Area Network), and controls them according to a control program 46P stored in the RAM 46. Perform various software functions.

  The two-point side buckle switch 44 detects the engagement state between the two-point side buckle 25 and the two-point side tongue 24. For example, a magnetic sensor such as a Hall IC disclosed in Japanese Patent Application Laid-Open No. 2006-12504 is used. A provided switch is used. When the two-point buckle 25 and the two-point tongue 24 are engaged, a high signal indicating that the two-point seat belt 20 is in the mounted state is output from the two-point buckle switch 44 to the control unit 41. . On the other hand, when the two-point buckle 25 and the two-point tongue 24 are not engaged, a low signal indicating that the two-point seat belt 20 is not in the mounted state is output from the two-point buckle switch 44. Is output.

  The three-point side buckle switch 45 has the same configuration as the two-point side buckle switch 45, and detects the engagement state between the three-point side buckle 15 and the three-point side tongue 14. When the three-point side buckle 15 and the three-point side tongue 14 are engaged, a high signal indicating that the three-point seat belt 10 is in the mounted state is output from the three-point side buckle switch 45 to the control unit 41. . On the other hand, when the three-point buckle 15 and the three-point tongue 14 are not engaged, a low signal indicating that the three-point seat belt 10 is not in the mounted state is output from the three-point buckle switch 45. Is output.

  The display unit 48 is a liquid crystal display or the like provided on the instrument panel, and displays various types of information related to seat belt attachment in accordance with instructions from the control unit 41. A three-point force limiter mechanism 43 that absorbs the rotational force in the pull-out direction of the three-point side belt 12 when a load greater than a predetermined value is applied to the three-point side belt 12 is provided inside the three-point side retractor 11. ing. The three-point side force limiter mechanism 43 changes the load to the first predetermined value or a second predetermined value smaller than this by switching the three-point side switch 431. Note that the three-point switch 431 operates based on an instruction from the control unit 41.

  As the three-point side force limiter mechanism 43, for example, the one described in Patent Document 4 or 5 may be used. In the present embodiment, an embodiment using the webbing take-up device described in Patent Document 4 will be described. A plurality of torsion bars (not shown) are provided inside the three-point side force limiter mechanism 43, and a load of a first predetermined value on which the plurality of torsion bars act by switching the three-point side switch 431, or One of the second predetermined value loads on which only one torsion bar acts is alternatively selected.

  Similarly, a two-point side force limiter mechanism 42 is provided inside the two-point side retractor 21. In the present embodiment, the two-point side retractor 21 is not provided with an equivalent to the three-point side switch 431 for changing the load. The two-point side force limiter mechanism 42 is provided with one torsion bar, and absorbs the rotational force in the pull-out direction of the two-point side belt 22 when a load of a third predetermined value or more is applied to the two-point side belt 22. To do.

  Next, the contents of the first predetermined value to the third predetermined value will be described. When the load of the force limiter mechanism 43 that is optimal when only the three-point seat belt 10 is used is X, the first predetermined value is substantially equal to the load X. On the other hand, when both the three-point seat belt 10 and the two-point seat belt 20 are used, the load relating to the second predetermined value of the three-point side force limiter mechanism 43 and the third predetermined value of the two-point side force limiter mechanism 42 are used. A value obtained by adding the loads related to is substantially equal to the load X.

  For example, the load relating to the second predetermined value of the three-point side force limiter mechanism 43 is X / 2, which is half of the first predetermined value. Similarly, the load relating to the third predetermined value of the two-point side force limiter mechanism 42 is also X / The torsional loads of the torsion bars of the three-point side force limiter mechanism 43 and the two-point side force limiter mechanism 42 may be set so as to be 2. Since it is not preferable for safety to wear the two-point seat belt 20 without wearing the three-point seat belt 10, the load of the two-point side force limiter mechanism 42 is only the third predetermined value. It is said.

  The procedure of load control in the above hardware configuration will be described using a flowchart. 8 and 9 are flowcharts showing the load control processing procedure. The control unit 41 determines whether or not a high signal is output from the three-point buckle switch 45 (step S81). When it is determined that the high signal is not output (NO in step S81), the control unit 41 determines whether a high signal is output from the two-point buckle switch 44 (step S82).

  When it is determined that the high signal is not output from the two-point side buckle switch 44 (NO in step S82), the control unit 41 determines that both seat belts are not attached and returns the process to step S81 again. In step S82, when it is determined that a high signal is output from the two-point side buckle switch 44 (YES in step S82), the control unit 41 determines that only the two-point seat belt 20 is attached, and stores it in the RAM 46 in advance. The stored wearing warning information of the three-point seat belt 10 is read and output to the display unit 48 (step S83). Thereafter, the process returns to S81 again. For example, characters such as “Please wear a three-point seat belt” may be displayed on the display unit 48 and the warning information may be output to a speaker (not shown).

  When the control unit 41 determines that a high signal is output from the three-point buckle switch 45 (YES in step S81), it determines whether a high signal is output from the two-point buckle switch 44 (step S84). . When the control unit 41 determines that a high signal is output from the two-point buckle switch 44 (YES in step S84), when both the three-point seat belt 10 and the two-point seat belt 20 are mounted. Judgment is made, and the three-point switch 431 is switched to the second predetermined value side (step S85).

  Thereby, the load of the three-point side force limiter mechanism 43 is reduced from the initial first predetermined value to the second predetermined value. Further, since the load of the two-point side force limiter mechanism 42 is the third predetermined value, a load X that is an added value of the second predetermined value and the third predetermined value is obtained in the seat belt device 100. On the other hand, when the control unit 41 determines in step S84 that the high signal is not output from the two-point buckle switch 44 (NO in step S84), it determines that only the three-point seat belt 10 is attached. The three-point side switch 431 is switched to the first predetermined value side (step S86). As a result, an appropriate load X is obtained for the three-point seat belt 10.

  Further, the control unit 41 reads the recommended mounting information of the two-point seat belt 20 stored in advance in the RAM 46, and outputs the read recommended mounting information to the display unit 48 (step S87). For example, characters such as “It is recommended to wear a two-point seat belt together” may be displayed on the display unit 48. The control unit 41 then refers to the output from the clock unit (not shown) and determines whether or not a predetermined time has elapsed (step S88). If the control unit 41 determines that the predetermined time has not elapsed (NO in step S88), the process returns to 84 again to cause the two-point seat belt 20 to be mounted, and the above process is repeated. On the other hand, when the control unit 41 determines that a certain time (for example, 1 minute) has elapsed (YES in step S88), the occupant M determines that the intention of wearing the two-point seat belt 20 is no longer low and ends the process. To do.

Embodiment 2
FIG. 10 is a schematic front view showing the configuration of the seat belt device 100 according to the second embodiment. As shown in the drawing, the three-point retractor 11 of the three-point seat belt 10 may be built in the seat back 2, and the three-point side guide portion 33 for guiding the three-point seat belt 10 is not a vehicle body. It may be attached to the seat back 2. The three-point side retractor 11 is embedded in the seat back 2. The three-point retractor 11 and the two-point retractor 21 are respectively embedded in symmetrical positions with a center line L dividing the seat back 2 equally in the vertical direction at the center position. That is, the two-point side retractor 21 and the three-point side retractor 11 are embedded at substantially the same height with a substantially same distance from the center line L.

  In addition, a three-point guide portion 33 is installed at the upper part on the other side of the seat back 2, and guides the three-point belt 12 that is wound up or pulled out from the three-point retractor 11. The three-point side guide portion 33 is installed on the seat back 2 with a rectangular opening for guiding the three-point side belt 12 facing the seating direction. The three-point side guide part 33 and the two-point side guide part 23 are respectively provided at symmetrical positions with the center line L as a boundary. That is, the three-point side guide portion 33 and the two-point side guide portion 23 are installed on the seat back 2 that is substantially the same height and spaced from the center line L by the substantially same distance. By making the winding position, the guide position, and the fixing position symmetrical in this way, it is possible to evenly restrain both the shoulders and the lower half of the occupant M by the interaction with the integrally connected belt. .

  A three-point tongue 14 is provided between the anchor portion 17 and the three-point side guide portion 33 so that the three-point side belt 12 can move. When the three-point seat belt 10 is not attached, the three-point side belt 12 is retracted to a position where the three-point side tongue 14 contacts the three-point side guide portion 33 by winding the three-point side retractor 11. 2 is wound inside. When the three-point seat belt 10 is mounted, the three-point side belt 12 is pulled out from the three-point side retractor 11, and the three-point side tongue 14 is moved from the three-point side guide portion 33 toward the three-point side buckle 15. 2 is crossed and the three-point buckle 15 is engaged.

  FIG. 11 is a schematic front view showing a state where the occupant M wears the three-point seat belt 10. When the occupant M wears the three-point seat belt 10, the three-point side tongue 14 that contacts the three-point side guide portion 33 is gripped near the right shoulder by winding the three-point side retractor 11. Cross the upper body and move it to the left waist position. Then, the three-point side tongue 14 is engaged with the three-point side buckle 15 fixed by the three-point side buckle plate 16. FIG. 12 is a schematic front view showing the configuration of the seat belt device 100 according to the second embodiment, and FIG. 13 is a schematic diagram showing the configuration when the seat belt device 100 according to the second embodiment is viewed from the left side in the occupant M seating direction. FIG. 14 is a schematic side view showing a configuration of the seat belt device 100 according to the second embodiment when viewed from the right side in the occupant M seating direction. A procedure for further mounting the two-point seat belt 20 after the three-point seat belt 10 shown in FIG. 11 is mounted will be described with reference to FIGS.

  The occupant M grips the two-point side buckle 25 at the left shoulder position after the three-point seat belt 10 is worn, and pulls out the two-point side buckle 25 from the left shoulder toward the right waist. The shoulder belt portion 6 of the two-point seat belt 20 crosses the upper portion of the two-point seat belt 20 across the portion 5, and the two-point side buckle 25 is engaged with the two-point side tongue 24. As a result, the two-point seat belt 20 and the three-point seat belt 10 are connected. In this embodiment, the three-point seat belt 10 is attached first, but the two-point seat belt 20 may be attached first. In the present embodiment, the two-point retractor 21 and the three-point retractor 11 are embedded in the seat back 2. However, when the seat belt device 100 is provided in the rear seat or the two-seat vehicle body, the two-point retractor 21 is provided. In addition, the three-point retractor 11 may be installed on the vehicle body provided behind the seat back 2.

  The second embodiment is configured as described above, and the other configurations and operations are the same as those of the first embodiment. Therefore, corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted.

Embodiment 3
FIG. 15 is an enlarged view showing an engaged state of the first engaging portion 24 and the second engaging portion 25 according to the third embodiment. As shown in the figure, the first engagement portion 24 may be a two-point side buckle 24 and the second engagement portion 25 may be a two-point side tongue 25. The engagement between the two-point side buckle 24 and the two-point side tongue 25 will be described with reference to FIG. The two-point side tongue 25 is a T-shaped plate and includes a guide portion 252 and an engagement hole 253. A square-shaped engagement hole 253 is formed at the substantially central portion of the tip of the two-point side tongue 25. When the two-point side tongue 25 is inserted into the two-point side buckle 24, the two-point side buckle is inserted into the engagement hole 253. A lock portion (not shown) inside 24 is engaged, and the two-point buckle 24 and the two-point tongue 25 are engaged.

  By pushing a release button 243 provided on the two-point side buckle 24, the engagement between the lock portion (not shown) and the engagement hole 253 is released, and the engagement between the two-point side buckle 24 and the two-point side tongue 25 is also released. The At the position facing the engagement hole 253 of the two-point side tongue 25, a horizontally elongated guide portion 252 is formed. The tip of the two-point side belt 22 is turned back through the guide portion 252 and stitched with a thread or fixed with an adhesive at an appropriate position to form a loop. The tip of the three-point belt 12 is sandwiched by a two-point buckle 24 through a guide portion 171 of the anchor portion 17.

  The two-point side buckle 24 takes in the tip of the three-point side belt 12 into the inside and is clamped from above and below by a clamping part 244 so as not to fall out. The two-point buckle 24 has a rectangular parallelepiped shape, and the oblong opening area in which the surface area of the rectangular holding portion 244 forms the guide portion 171 of the anchor portion 17 as viewed from the engagement direction indicated by the white arrow in the drawing. It is formed larger. That is, when the three-point side belt 12 is wound, the two-point side buckle 24 moves in the direction of the guide portion 171, and finally, the clamping portion 244 of the two-point side buckle 24 is moved to the guide portion 171 of the anchor portion 17. The movement is restricted by contact.

  The third embodiment is configured as described above, and the other configurations and operations are the same as those of the first and second embodiments. Therefore, corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted. To do.

Embodiment 4
16 is an enlarged view showing an engagement state between the two-point side tongue 24 and the two-point side buckle 25 according to the fourth embodiment, and FIG. 17 is a two-point side tongue 24 and the two-point side buckle 25 according to the fourth embodiment. It is a typical side view which shows an engagement state. As shown in the figure, the first engagement portion 24 according to the fourth embodiment is configured to further include stop members 245 and 245 provided at one end of the three-point side belt 12. At the position facing the engagement hole 241 of the two-point side tongue 24, a horizontally elongated guide portion 242 is formed. The tip of the three-point side belt 12 is guided to the guide portion 171 of the anchor portion 17 and the guide portion 242 of the two-point side tongue 24 and is folded back by the guide portion 242.

  The tip of the folded three-point belt 12 is overlapped as shown in FIG. 17, and a loop is formed by penetrating a resin stop member 245, for example. The stop member 245 is composed of a bolt 245a and a nut 245b. The bolt 245a is passed through the three-point belt 12 that has been previously formed with a hole having a predetermined diameter, and the bolt 245a after passing is screwed into the nut 245b. The height A in the sectional view of the stop member 245 is set to be longer than the length B of the guide portion 171 of the anchor portion 17 in the engagement direction (see FIG. 16) indicated by the white arrow.

  When the three-point belt 12 is wound and moves in the direction opposite to the white arrow, the two-point tongue 24 moves accordingly. When the stop members 245 and 245 come into contact with the guide portion 171 of the anchor portion 17, the movement of the two-point side tongue 24 as the first engagement portion 24 is also restricted via the stop members 245 and 245. . Although two stop members 245 and 245 are provided in the present embodiment, one or three or more stop members may be provided. Moreover, although the shape is circular in plan view, it may be oval or rectangular. In this way, the three-point belts 12 and 12 passing through the guide portion 242 of the two-point tongue 24 are screwed through the stop members 245 and 245 formed of resin or the like, and are passed through the stop members 245 and 245. Since the two-point side tongue 24 is brought into contact with the guide portion 171 of the anchor portion 17, the generation of contact noise between the stop members 245 and 245 and the guide portion 171 can be reduced, and a three-point side belt can be used in an accident or the like It is possible to reduce the impact due to the winding of 12.

  Furthermore, when the seat belt device 100 is not worn in a passenger seat or the like, it is possible to prevent the generation of contact sound when the guide portion 171 of the anchor portion 17 and the guide portion 242 of the two-point side tongue 24 are idling. It becomes possible. As shown in FIG. 17 of the third embodiment, when a two-point buckle 24 is used for the first engagement portion 24, a stop member made of a resin rectangle is attached to the holding portion 244 of the two-point side buckle 24. You may make it insert.

  The fourth embodiment is configured as described above, and the other configurations and operations are the same as those of the first to third embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 5
FIG. 18 is a schematic perspective view showing structures of the anchor portion 17 and the two-point side tongue 24 according to the fifth embodiment. As shown in FIG. 18, the anchor portion 17 is a plate having a hand mirror shape, and includes a fixing portion 172, a flat plate 174, a guide portion 171, and projecting portions 173 and 173. The anchor portion 17 has a rectangular flat plate 174 extending in a direction opposite to the fixed portion 172 with the guide portion 171 as a boundary. Projections 173 and 173 are provided on the flat plate 174 so as to face the guide portion 171. The detailed structure of the protrusions 173 and 173 will be described later.

  The two-point tongue 24 includes an engagement hole 241, a guide portion 242, and openings 246 and 246. The guide part 242 guides the three-point side belt 12 formed narrow at the tip. The lateral width of the oval guide portion 242 is similarly set to be narrow according to the width of the tip of the three-point side belt 12. The three-point side belt 12 passes through the guide portion 171 of the anchor portion 17 and the guide portion 242 of the two-point side tongue 24, is folded back to the opposite side at the guide portion 242, and is sewn and fixed at the sewing portion 121.

  Openings 246 and 246 that can be attached to and detached from the protrusions 173 and 173 are formed on both sides of the guide portion 242 of the two-point side tongue 24. The opening widths of the openings 246 and 246 are W, and are formed into the two-point side tongue 24 up to a predetermined depth in a state where the opening of the opening width W is maintained.

  FIG. 19 is a schematic diagram showing a mounting structure of the anchor portion 17 and the two-point side tongue 24 according to the fifth embodiment. By pushing the openings 246 and 246 of the two-point side tongue 24 in the opposite direction to the protrusions 173 and 173 of the anchor part 17 in the opposite direction of the white arrow shown in the figure, that is, in the opposite direction of the engagement direction, The openings 246 and 246 and the protrusions 173 and 173 are attached, and the attachment of the anchor portion 17 and the two-point side tongue 24 is completed. Then, the two-point buckle 25 is engaged with the integrated two-point side tongue 24.

  In a state where the two-point side tongue 24 and the two-point side buckle 25 are engaged, when the winding of the two-point side belt 22 is performed at a predetermined load or more, the openings 246 and 246 of the two-point side tongue 24 are provided. However, the two-point side buckle 25 and the two-point side tongue 24 that are in the engaged state move in the engagement direction by separating from the protrusions 173 and 173 of the anchor portion 17. On the other hand, when the three-point side belt 12 is wound, the two-point side buckle 25 and the two-point side tongue 24 in the engaged state move to the opposite side in the engagement direction, and the two-point side tongue 24 is anchored. Abutting on the portion 17, the openings 246 and 246 of the two-point side tongue 24 are mounted on the protrusions 173 and 173 of the anchor portion 17, and movement is restricted.

  20 is a schematic side view showing the attachment structure of the anchor portion 17 and the two-point side tongue 24 according to the fifth embodiment, and FIG. 21 is a schematic cross-sectional view showing the attachment structure of the projection 173 and the opening 246. is there. As shown in the drawing, the protrusion 173 includes a nut 173a, a pin 173b, a washer 173c, and a ring 173d. The pin 173b passes through a hole, a washer 173c, a ring 173d, and a nut 173a formed in the flat plate 174 of the anchor portion 17 in this order from the opposite direction in FIG. 17, and is screwed with the nut 173a. A ring 173d made of, for example, resin is inserted between the washer 173c and the nut 173a to prevent easy detachment from the projections 173 and 173 of the openings 246 and 246.

  The openings 246 and 246 are mounted around the ring 173d fitted between the washer 173c and the nut 173a of the protrusions 173 and 173 formed as described above. As shown in FIG. 21, when the diameter of the pin 173b is φ1 and the outer diameter of the ring 173d is φ2, the opening width W of the opening 246 is larger than the diameter φ1 of the pin 173b and the outer diameter of the ring 173d is larger than φ2. Is preferably set to a small value. By setting the opening width W to an optimum value in this way, easy separation of the openings 246 and 246 from the protrusions 173 and 173 can be prevented. In FIG. 18 and FIG. 19, the description of the nut 173a, the pin 173b, the washer 173c, and the ring 173d that constitute the protruding portion 173 is omitted for easy explanation.

  In the present embodiment, the protruding portion 173 includes the nut 173a, the pin 173b, the washer 173c, and the ring 173d. However, the present invention is not limited to this configuration. For example, the protruding portion 173 is formed on the flat plate 174 of the anchor portion 17. 173 may be vertically formed, and the openings 246 and 246 may be attached to and detached from this, and a non-slip member made of resin may be provided around the opening 246. Further, in the present embodiment, the two protrusions 173 and 173 and the openings 246 and 246 are provided, but one or three or more of these may be formed.

  The fifth embodiment has the above-described configuration, and the other configurations and operations are the same as those of the first to fourth embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 6
The sixth embodiment relates to a mode in which the opening portions 173 and 173 are provided in the anchor portion 17 and the projection portions 246 and 246 are provided in the two-point side tongue 24. FIG. 22 is a schematic perspective view showing structures of the anchor portion 17 and the two-point side tongue 24 according to the sixth embodiment. As shown in FIG. 19, the anchor portion 17 is a plate having a hand mirror shape, and includes a fixing portion 172, a flat plate 174, a guide portion 171, and openings 173 and 173. The anchor portion 17 has a rectangular flat plate 174 extending in a direction opposite to the fixed portion 172 with the guide portion 171 as a boundary. Openings 173 and 173 are formed on the flat plate 174 at positions facing the guide portion 171. The openings 173 and 173 are formed with the openings facing the guide 171. The opening width of the openings 173 and 173 is W. The openings 173 and 173 are formed toward the inside of the flat plate 174 of the anchor portion 17 to a predetermined depth while maintaining an opening having an opening width W.

  The two-point tongue 24 includes an engagement hole 241, a guide part 242, and projecting parts 246 and 246. The guide part 242 guides the three-point side belt 12 formed narrow at the tip. The lateral width of the oval guide portion 242 is similarly set to be narrow according to the width of the tip of the three-point side belt 12. The three-point side belt 12 passes through the guide portion 171 of the anchor portion 17 and the guide portion 242 of the two-point side tongue 24, is folded back to the opposite side at the guide portion 242, and is sewn and fixed at the sewing portion 121. Protrusions 246 and 246 are formed on both sides of the guide portion 242 on the back surface of the two-point tongue 24. Since the shape and size of the protrusions 246 and 246 are the same as those in the fifth embodiment, detailed description thereof is omitted.

  FIG. 23 is a schematic diagram showing a mounting structure of the anchor portion 17 and the two-point side tongue 24 according to the sixth embodiment. The protrusions 246 and 246 on the back surface of the two-point tongue 24 are positioned opposite to the openings 173 and 173 formed in the anchor portion 17, respectively, in the opposite direction of the white arrow shown in the drawing, that is, on the opposite side in the engagement direction. The projections 246 and 246 and the openings 173 and 173 are attached by pushing in, and the attachment between the anchor part 17 and the two-point side tongue 24 is completed. Then, the two-point buckle 25 is engaged with the integrated two-point side tongue 24.

  When the two-point side tongue 22 and the two-point side buckle 25 are engaged with each other, when the two-point side belt 22 is wound at a predetermined load or more, the projections 246 and 246 of the two-point side tongue 24 are provided. However, the two-point side buckle 25 and the two-point side tongue 24 that are in the engaged state move in the engagement direction by separating from the openings 173 and 173 of the anchor portion 17. On the other hand, when the three-point side belt 12 is wound, the two-point side buckle 25 and the two-point side tongue 24 in the engaged state move to the opposite side in the engagement direction, and the two-point side tongue 24 is anchored. The protrusions 246 and 246 on the back surface of the two-point side tongue 24 are attached to the openings 173 and 173 of the anchor portion 17 so that the movement is restricted.

  The sixth embodiment has the above-described configuration, and the other configurations and operations are the same as those of the first to fifth embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 7
FIG. 24 is a schematic diagram showing an engaged state between the two-point side buckle 24 and the two-point side tongue 25 according to the seventh embodiment. As shown in the figure, the first engagement portion 24 may be a two-point side buckle 24 and the second engagement portion 25 may be a two-point side tongue 25. The engagement between the two-point side buckle 24 and the two-point side tongue 25 will be described with reference to FIG. The two-point side tongue 25 is a T-shaped plate and includes a guide portion 252 and an engagement hole 253. A square-shaped engagement hole 253 is formed at the substantially central portion of the tip of the two-point side tongue 25. When the two-point side tongue 25 is inserted into the two-point side buckle 24, the two-point side buckle is inserted into the engagement hole 253. A lock portion (not shown) inside 24 is engaged, and the two-point buckle 24 and the two-point tongue 25 are engaged.

  On the opposite side of the two-point side buckle 24 in the engaging direction, a joining piece 247 having a guide portion 242 and openings 246 and 246 is sandwiched in the vertical direction by the two-point side buckle 24. The joining piece 247 has substantially the same configuration as one end of the two-point tongue 24 described in the fifth embodiment, and is sandwiched and fixed by the two-point buckle 24 at a position facing the guide portion 242. Openings 246 and 246 are formed with an opening width W such that the opening of the joining piece 247 faces the opposite side in the engagement direction. Protrusions 173 and 173 are provided on the flat plate 174 of the anchor portion 17 so as to be detachable from the openings 246 and 246.

  Openings 246 and 246 formed in the joining piece 247 sandwiched by the two-point buckle 24 are formed on the protrusions 173 and 173 formed on the anchor portion 17 in the direction opposite to the white arrow shown in the drawing, that is, in the engagement direction. By pushing in the opposite side, the openings 246 and 246 and the projections 173 and 173 are attached, and the attachment of the anchor part 17 and the two-point side buckle 24 is completed. Then, the two-point side tongue 25 is engaged with the integrated two-point side buckle 24.

  In the state where the two-point tongue 25 and the two-point buckle 24 are engaged, when the winding of the two-point belt 22 is performed at a predetermined load or more, the openings 246 and 246 of the two-point buckle 24 are used. However, the two-point side buckle 24 and the two-point side tongue 25 that are in the engaged state move in the engagement direction by separating from the protrusions 173 and 173 of the anchor portion 17. On the other hand, when the three-point side belt 12 is wound, the two-point side buckle 24 and the two-point side tongue 25 in the engaged state move to the opposite side in the engagement direction, and the two-point side buckle 24 is joined. The piece 247 comes into contact with the anchor portion 17, and the openings 246 and 246 of the joining piece 247 of the two-point side buckle 24 are attached to the projecting portions 173 and 173 of the anchor portion 17, and movement is restricted. In this embodiment, the openings 246 and 246 are formed in the joint piece 247 of the two-point side buckle 24, and the protrusions 173 and 173 are provided in the anchor portion 17. However, FIG. As shown in the figure, the protrusions 246 and 246 may be formed on the back surface of the joining piece 247 of the two-point side buckle 24, and the openings 173 and 173 may be provided in the anchor portion 17.

  The seventh embodiment has the above-described configuration, and the other configurations and operations are the same as those of the first to sixth embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 8
FIG. 25 is an enlarged view showing an engagement state between the two-point side tongue 24 and the two-point side buckle 25 according to the eighth embodiment. As shown in FIG. 25, the anchor portion 17 may be detachable from the vehicle body or the seat cushion 1. The anchor portion 17 is a T-shaped plate and includes a guide portion 171 and an engagement hole 175. A square-shaped engagement hole 175 is formed at the center of the tip of the anchor portion 17. A laterally long guide part 171 is formed at a position facing the engagement hole 175, and guides the three-point belt 12 to the guide part 171 so as to be movable. The three-point belt 12 passes through the guide portion 171 and is turned back through the guide portion 242 of the two-point side tongue 24, and is stitched with a thread or fixed with an adhesive at an appropriate position to form a loop.

  A fixing buckle 176 is provided on the other side surface of the seat cushion 1. The fixing buckle 176 includes a release button 177, a fixing portion 172, and a fixing piece 178. The fixing buckle 176 has a rectangular parallelepiped housing, and holds the fixing piece 178 in the vertical direction. The fixing portion 172 such as a bolt penetrates the fixing piece 178 from the other side of the seat cushion 1 toward the one side at the lower central portion of the fixing piece 178, and fixes the fixing piece 178 to the seat cushion 1. The fixing buckle 176 rotates about a predetermined angle about the fixing portion 172.

  When the anchor portion 17 is moved in the opposite direction of the engagement direction, that is, in the opposite direction of the white arrow and inserted into the fixing buckle 176, a locking portion (not shown) inside the fixing buckle 176 is engaged with the engagement hole 175, and the anchor portion 17 is engaged. And the fixing buckle 176 are engaged, and the anchor portion 17 is detachably fixed to the seat cushion 1 via the fixing buckle 176.

  By pushing a release button 177 provided on the fixing buckle 176, the engagement between the lock portion (not shown) and the engagement hole 175 is released, and the engagement between the anchor portion 17 and the fixing buckle 176 is also released.

  FIG. 26 is a schematic front view showing the configuration of the seat belt device 100 according to the eighth embodiment. FIG. 26 shows a state in which all the engagement of the seat belt device 100 is released, and the three-point side belt 12 is wound up by the three-point side retractor 11. The two-point side tongue 24, the anchor portion 17, and the three-point side tongue 14 are suspended above the other side of the seat back 2 in order from the tip of the three-point side belt 12. The occupant M grasps the two-point side tongue 24, the anchor portion 17 or the three-point side tongue 14, and fixes the anchor portion 17 to the fixing buckle 176, the three-point side tongue 14 to the three-point side buckle 15, and the two-point side tongue. The engagement of the seat belt device 100 is completed by engaging the 24 with the two-point side buckle 25. In this way, when the three-point belt 10 is not attached, the two-point side tongue 24, the anchor portion 17 and the three-point side tongue 14 are suspended above the seat back 2 other side as shown in FIG. The occupant M can easily get on and off.

  Embodiment 8 has the above-described configuration, and the other configurations and operations are the same as those in Embodiments 1 to 7. Accordingly, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 9
The ninth embodiment relates to a configuration in which the three-point seat belt 10 and the two-point seat belt 20 are independent of each other. FIG. 27 is a schematic perspective view showing the configuration of the seat belt device according to the ninth embodiment. In FIG. 27, the three-point seat belt 10 and the two-point seat belt 20 are independently arranged to face each other on the passenger seat side. The three-point seat belt 10 is arranged around the right side (hereinafter referred to as the other side) when viewed from the front of the vehicle, and is arranged at the three-point side retractor 11, the three-point side belt 12, the three-point side guide portion 13, and the three-point side. The tongue 14, the anchor portion 17, the bolt 170, and the three-point side buckle 15 are included. The three-point side retractor 11 is housed inside the B pillar on the other side, and winds and unwinds one end of the three-point side belt 12. A three-point guide portion 30 having a substantially elliptical shape when viewed from the front is provided from the rear side of the seat back 2 toward the front.

  The three-point side belt 12 passes through the three-point side guide portion 13 from the back surface of the seat back 2 and is pulled out to the front side. An anchor portion 17 that holds one end of the three-point side seat belt 13 is fixed to the other side surface end of the seat cushion 1. The anchor portion 17 is fixed to the side surface of the seat cushion 1 so that it can be rotated within a predetermined range by a bolt 170. The three-point side belt 12 is provided with a three-point side tongue 14 that can freely move between the three-point side guide portion 13 and the anchor portion 17. A three-point buckle 15 is provided at one end of the side surface of the seat cushion 1, and the three-point buckle 15 and the three-point side tongue 14 are engaged with each other.

  Next, the two-point seat belt 20 will be described. The two-point seat belt 20 is provided centering on the left side (hereinafter referred to as one side) when viewed from the front of the vehicle. The two-point side retractor 21, the two-point side guide portion 23, the two-point side belt 22, A side tongue 24, a two-point side buckle 25, and an arm 250 are included. The two-point retractor 21 is housed inside one side of the seat back 2 and winds and unwinds one end of the two-point belt 22. A two-point guide portion 23 having a substantially elliptical shape when viewed from the front is provided from one side rear surface to the front surface of the seat back 2.

  The two-point side belt 22 passes through the two-point side guide portion 23 from the back surface of the seat back 2 and is pulled out to the front side. A two-point tongue 24 is attached to the tip of the two-point belt 22. In the vicinity of the anchor portion 17 on the other side surface of the seat cushion 1, an arm 250 is projected. One end of the arm 250 is fixed to the side surface of the seat cushion 1, and the other end is connected to the two-point side buckle 25. Thus, unlike the first embodiment, the anchor portion 17 of the three-point seat belt 10 and the two-point side buckle 25 of the two-point seat belt 20 are independent from each other. The side tongue 24 engages.

  Also in the present embodiment, load control is performed as shown in FIG. 7 of the first embodiment. A three-point buckle switch 45 is provided inside the three-point buckle 15 to detect the wearing state of the three-point seat belt 10. A two-point buckle switch 44 is provided inside the two-point buckle 25 to detect the mounting state of the two-point seat bell 20. A three-point side switch 431 that changes the load of the three-point side force limiter mechanism 43 is provided inside the three-point side retractor 11, and a two-point side force limiter mechanism 42 is provided on the two-point side retractor 21. When only the three-point seat belt 10 is mounted, a load having a first predetermined value is selected by the three-point switch 431, and the three-point force limiter mechanism 43 operates with the load. Further, when the two-point seat belt 20 is mounted, the load of the second predetermined value is selected by the three-point side switch 431, and the three-point side force limiter mechanism 43 operates with the load, and the third predetermined value. The two-point side force limiter 42 operates with a load of.

  The ninth embodiment is configured as described above, and the other configurations and operations are the same as those of the first to eighth embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 10
The tenth embodiment relates to a form in which the load is controlled in consideration of the weight of the occupant M, the collision prediction, the collision form, and the like in addition to the seat belt wearing state. FIG. 28 is a block diagram illustrating a hardware configuration of a seat belt apparatus that performs load control processing according to the tenth embodiment. In addition to the configuration of the first embodiment, the two-point side force limiter mechanism 42 of the two-point side retractor 21 is provided with a two-point side switch 421, and the first load table 461 and the second load table 462 are the RAM 46. Further, a collision prediction device 49, a weight sensor 411, and a collision type detection device 410 are further provided.

  Like the three-point side force limiter mechanism 43 of the first embodiment, the two-point side force limiter mechanism 42 in the present embodiment is provided with two torsion bars to apply two different loads. Specifically, the force limiter operates according to the load relating to the fifth predetermined value and the sixth predetermined value smaller than the fifth predetermined value. The two-point side switch 421 is connected to the two-point side force limiter mechanism 42, and selects either the fifth predetermined value or the sixth predetermined value according to an instruction from the control unit 41.

  Unlike the first embodiment, the three-point side force limiter mechanism 43 operates according to a total of four stages of loads. Specifically, it is possible to set the loads related to the first predetermined value, the third predetermined value, the second predetermined value, and the fourth predetermined value in descending order of load. The three-point side force limiter mechanism 43 according to the present embodiment is provided with four torsion bars inside so as to enable four-stage load setting. The three-point side switch 431 is connected to the three-point side force limiter mechanism 43, and selects any load from the first predetermined value to the fourth predetermined value in accordance with an instruction from the control unit 41. When the first predetermined value is required for the three-point side force limiter mechanism 43, an internal gear (not shown) is selected by operating the three-point side switch 431 so that all four torsion bars operate. Similarly, when the third predetermined value is required for the three-point side force limiter mechanism 43, the internal gear is selected so that the three torsion bars operate by the selection of the three-point side switch 431.

  When the second predetermined value is required for the three-point side force limiter mechanism 43, the internal gear is selected so that the two torsion bars operate by the selection of the three-point side switch 431, and the fourth predetermined value is required. By selecting the three-point switch 431, the internal gear is selected so that only one torsion bar operates. The weight sensor 411 is provided inside the seat cushion 1 and outputs the weight of the occupant M to the control unit 41. In the present embodiment, for ease of explanation, a high signal is output to the control unit 41 when the weight sensor detects 40 kg or more, and a low signal is output when the weight sensor is less than 40 kg.

  For example, as disclosed in Japanese Patent Application Laid-Open No. 2004-1591, the collision prediction device 49 includes a millimeter wave sensor, an image sensor, an infrared laser sensor, a GPS (Global Positioning System), and the like, and whether or not the vehicle collides with another vehicle. Is predicted. This prediction is performed in all directions, front, rear, left, and right of the vehicle, prediction of collision direction, prediction of full-lap collision or offset collision, prediction of the type of collision object, prediction of the size of the collision object, prediction of the relative speed of collision, and For example, the collision relative acceleration is predicted, and the detection result is output from the collision prediction device 49 to the control unit 41. In the present embodiment, for ease of explanation, when the collision prediction device 49 predicts a full wrap collision, a high signal is output to the control unit 41, and when an offset collision is predicted, a low signal is output to the control unit 41. Output to.

  The collision type detection device 410 includes a gyro, an acceleration sensor, an impact sensor, and the like. When a collision accident occurs, the collision detection apparatus 410 detects whether the accident is a rollover, whether it is a collision other than a rollover, Detection, collision type detection and collision scale (crushability) detection are performed, and the detection result is output to the control unit 41. In the present embodiment, for ease of explanation, a high signal is output to the control unit 41 when the collision type detection device 410 detects a rollover, and a low signal is detected when a collision other than the rollover is detected. It is assumed that a signal is output to the control unit 41.

  FIG. 29 is an explanatory diagram showing a record layout of the first load table 461. The first load table 461 is selected by the control unit 41 when the high signal indicating the mounting state is output only from the three-point side buckle switch 45 and the high signal is not output from the two-point side buckle switch 44. The The first load table 461 stores two types of loads depending on the state. A first predetermined value and a third predetermined value are stored according to the weight of the occupant M, respectively. Since a large load is required when the weight of the occupant M is large, a first predetermined value larger than the third predetermined value is stored.

  Further, a first predetermined value is stored in association with the full lap collision prediction that is a collision prediction, and a third predetermined value is stored in correspondence with the offset collision prediction. Further, a first predetermined value is stored corresponding to rollover as a collision mode, and a third predetermined value is stored corresponding to a collision other than rollover. When the high signal is output from the weight sensor 411, the control unit 41 refers to the first load table 461 and reads the first predetermined value, and when the low signal is output, reads the second predetermined value. Output to the switch 431. The three-point side switch 431 changes the load of the three-point side force limiter mechanism 43 accordingly.

  Similarly, when a high signal is output from the collision prediction device 49, the control unit 41 reads the first predetermined value with reference to the first load table 461, and reads the third predetermined value when a low signal is output. Output to the three-point switch 431. The three-point side switch 431 changes the load of the three-point side force limiter mechanism 43 accordingly. Further, when a high signal is output from the collision type detection device 410, the control unit 41 reads the first predetermined value with reference to the first load table 461, and reads the second predetermined value when the low signal is output, Output to the three-point switch 431. The three-point side switch 431 changes the load of the three-point side force limiter mechanism 43 accordingly.

  FIG. 30 is an explanatory diagram showing a record layout of the second load table 462. The second load table 462 is selected by the control unit 41 when a high signal indicating the mounting state is output from both the three-point buckle switch 45 and the two-point buckle switch 44. The second load table 462 stores a total of four types of loads according to the state. Regarding the three-point seat belt 10, the second predetermined value and the fourth predetermined value are stored according to the weight of the occupant M, respectively. Since a large load is required when the weight of the occupant M is large, a second predetermined value larger than the fourth predetermined value is stored. Regarding the two-point seat belt 20, a fifth predetermined value and a sixth predetermined value are stored according to the weight of the occupant M, respectively. Since a large load is required when the weight of the occupant M is large, a fifth predetermined value larger than the sixth predetermined value is stored.

  Since the occupant M is supported by the three-point seat belt 10 and the two-point seat belt 20, the first predetermined value, the second predetermined value, and the fifth predetermined value when using only the three-point seat belt 10 are used. The value is set to be approximately equal. Similarly, the third predetermined value is approximately equal to the total value of the fourth predetermined value and the sixth predetermined value.

  The second load table 462 stores a second predetermined value for the three-point seat belt 10 corresponding to the full-lap collision prediction, which is a collision prediction, and a fourth predetermined value for the offset collision prediction. ing. Further, regarding the two-point seat belt 20, a fifth predetermined value is stored in correspondence with the full lap collision prediction, and a sixth predetermined value is stored in correspondence with the offset collision prediction. Further, regarding the three-point seat belt 10, a second predetermined value is stored in association with a rollover that is a collision mode, and a fourth predetermined value is stored in association with a collision other than the rollover. Regarding the two-point seat belt 20, a fifth predetermined value is stored in association with the rollover, and a sixth predetermined value is stored in association with a collision other than the rollover.

  When a high signal is output from the weight sensor 411, the control unit 41 refers to the second load table 462, reads the second predetermined value, and outputs it to the three-point switch 431. The three-point side switch 431 changes the load of the three-point side force limiter mechanism 43 accordingly. At the same time, the control unit 41 reads the fifth predetermined value and outputs it to the two-point switch 421. The two-point side switch 421 changes the load of the two-point side force limiter mechanism 42 accordingly. When a low signal is output from the weight sensor 411, the control unit 41 refers to the second load table 462, reads the fourth predetermined value, and outputs it to the three-point switch 431. At the same time, the control unit 41 reads the sixth predetermined value and outputs it to the two-point switch 421.

  When a high signal is output from the collision predicting device 49, the control unit 41 refers to the second load table 462, reads the second predetermined value, and outputs it to the three-point switch 431. The three-point side switch 431 changes the load of the three-point side force limiter mechanism 43 accordingly. At the same time, the control unit 41 reads the fifth predetermined value and outputs it to the two-point switch 421. The two-point side switch 421 changes the load of the two-point side force limiter mechanism 42 accordingly. When a low signal is output from the collision prediction device 49, the control unit 41 refers to the second load table 462, reads the fourth predetermined value, and outputs it to the three-point switch 431. At the same time, the control unit 41 reads the sixth predetermined value and outputs it to the two-point switch 421.

  Similarly, when a high signal is output from the collision type detection device 410, the control unit 41 refers to the second load table 462, reads the second predetermined value, and outputs it to the three-point switch 431. The three-point side switch 431 changes the load of the three-point side force limiter mechanism 43 accordingly. At the same time, the control unit 41 reads the fifth predetermined value and outputs it to the two-point switch 421. The two-point side switch 421 changes the load of the two-point side force limiter mechanism 42 accordingly. When a low signal is output from the collision type detection device 410, the control unit 41 refers to the second load table 462, reads the fourth predetermined value, and outputs it to the three-point switch 431. At the same time, the control unit 41 reads the sixth predetermined value and outputs it to the two-point switch 421. The user selects whether to change the load according to the weight of the occupant M described above, the load according to the collision prediction, or the load according to the collision mode depending on a menu mode or the like (not shown). Any one may be selected.

  In the above configuration, the procedure of the load control process by the control unit 41 will be described using a flowchart. For ease of explanation, only the mode of changing the load according to the weight of the occupant M will be described. 31 and 32 are flowcharts showing the procedure of the load control process. The control unit 41 determines whether or not a high signal is output from the three-point buckle switch 45 (step S311). When it is determined that the high signal is not output (NO in step S311), the control unit 41 determines whether a high signal is output from the two-point buckle switch 44 (step S312).

  When it is determined that the high signal is not output from the two-point side buckle switch 44 (NO in step S312), the control unit 41 determines that both seat belts are not attached and returns the process to step S311. In step S312, when it is determined that a high signal is output from the two-point side buckle switch 44 (YES in step S312), the control unit 41 determines that only the two-point seat belt 20 is attached, and stores it in the RAM 46 in advance. The stored wearing warning information of the three-point seat belt 10 is read and output to the display unit 48 (step S313). Thereafter, the process returns to S311 again.

  When the control unit 41 determines that a high signal is output from the three-point side buckle switch 45 (YES in step S311), the control unit 41 determines whether a high signal is output from the two-point side buckle switch 44 (step S314). . When it is determined that the high signal is not output from the two-point buckle switch 44 (NO in step S314), the control unit 41 determines whether a high signal is output from the weight sensor 411 (step S315). When it is determined that the high signal is output (YES in step S315), the control unit 41 reads the first predetermined value from the first load table 461 and outputs the first predetermined value to the three-point switch 431 (step S316). Although not repeatedly described below, it is a matter of course that the code number corresponding to the first predetermined value itself may be output to the three-point switch 431 instead of outputting the data. In this case, the three-point side switch 431 receives this code number and changes the load of the three-point side force limiter mechanism 43. On the other hand, when the control unit 41 determines that the high signal is not output (NO in step S315), the control unit 41 reads the third predetermined value from the first load table 461 and outputs the third predetermined value to the three-point switch 431 (step S317).

  In step S314, when the control unit 41 determines that a high signal is output from the 2-point buckle switch 44 (YES in step S314), the control unit 41 determines whether a high signal is output from the weight sensor 411 (step S318). . When it is determined that the high signal is output from the weight sensor 411 (YES in Step S318), the control unit 41 reads the second predetermined value from the second load table 462 and outputs the second predetermined value to the three-point switch 431 (Step S319). ). Next, the control unit 41 reads the fifth predetermined value from the second load table 462 and outputs the fifth predetermined value to the two-point switch 421 (step S321).

  When the control unit 41 determines that the high signal is not output from the weight sensor 411 (NO in step S318), the control unit 41 reads the fourth predetermined value from the second load table 462 and outputs the fourth predetermined value to the three-point switch 431 (step S322). ). Next, the control unit 41 reads the sixth predetermined value from the second load table 462 and outputs it to the two-point switch 421 (step S323). Accordingly, it is possible to finely control the force limiter load according to the state of wearing the plurality of seat belts and according to the weight of the occupant M, the collision prediction or the collision mode, and the like.

  The tenth embodiment has the above-described configuration, and the other configurations and operations are the same as those of the first to ninth embodiments. Therefore, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

Embodiment 11
The eleventh embodiment relates to a form using a two-point seat belt 20 provided at a symmetrical position. FIG. 33 is a schematic perspective view showing the configuration of the seat belt device according to the eleventh embodiment. The seat belt device 100 according to the present embodiment includes a two-point seat belt 20 and an auxiliary two-point seat belt 20S provided at symmetrical positions. The two-point seat belt 20 is as described with reference to FIG.

  The auxiliary two-point seat belt 20S is provided on the other side and has substantially the same configuration as the two-point seat belt 20. The auxiliary two-point retractor 21S, the auxiliary two-point side guide portion 23S, and the auxiliary two-point side belt 22S. The auxiliary two-point side tongue 24S, the auxiliary two-point side buckle 25S, and the auxiliary arm 250S are configured. The auxiliary two-point side retractor 21S is housed inside the B pillar 3 on the other side of the seat back 2, and winds and unwinds one end of the auxiliary two-point side belt 22S. An auxiliary two-point side guide portion 23 </ b> S having a substantially elliptical shape in front view is provided from the other side rear surface to the front side of the seat back 2.

  The auxiliary two-point side belt 22S passes through the auxiliary two-point side guide portion 23S from the back surface of the seat back 2 and is pulled out to the front side. An auxiliary two-point side tongue 24S is attached to the tip of the auxiliary two-point side belt 22S. An auxiliary arm 250 </ b> S protrudes from one end of the side surface of the seat cushion 1. One end of the auxiliary arm 250S is fixed to the side surface of the seat cushion 1, and the other end is connected to the auxiliary two-point side buckle 25S. When the two-point seat belt 20 is worn, the two-point side tongue 24 is gripped, the seat back 2 is crossed, and the two-point side buckle 25 and the two-point side tongue 24 are engaged. Further, when the auxiliary two-point seat belt 20S is mounted, the auxiliary two-point side tongue 24S is gripped, the seat back 2 is crossed, and the auxiliary two-point side buckle 25S and the auxiliary two-point side tongue 24S are engaged.

  FIG. 34 is a block diagram illustrating a hardware configuration of the seat belt device 100 that performs load control processing. The two-point side retractor 21 includes a two-point side force limiter mechanism 42 that can operate with a load relating to the first predetermined value or the third predetermined value. The two-point side switch 421 is connected to the two-point side force limiter mechanism 42, and selects either the first predetermined value or the third predetermined value in accordance with an instruction from the control unit 41. On the other hand, the auxiliary two-point side retractor 21S includes an auxiliary two-point side force limiter mechanism 42S that can operate with a load relating to the second predetermined value or the fourth predetermined value. The auxiliary two-point side switch 421S is connected to the auxiliary two-point side force limiter mechanism 42S, and selects either the second predetermined value or the fourth predetermined value in accordance with an instruction from the control unit 41.

  The two-point buckle switch 44 outputs a high signal to the control unit 41 when the two-point seat belt 20 is in the mounted state. Similarly, the auxiliary two-point buckle switch 44S outputs a high signal to the control unit 41 when the auxiliary two-point seat belt 20S is in the mounted state, and outputs a low signal when it is not mounted.

  When the high signal is output only from the two-point side buckle switch 44, the control unit 41 outputs the first predetermined value stored in advance in the RAM 46 to the two-point side switch 421. That is, when the two-point seat belt 20 is used alone, the two-point side force limiter mechanism 42 operates with the load according to the first predetermined value. Similarly, when a high signal is output only from the auxiliary two-point buckle switch 44S, the control unit 41 outputs a second predetermined value stored in advance in the RAM 46 to the auxiliary two-point switch 421S. That is, when the auxiliary two-point seat belt 20S is used alone, the auxiliary two-point side force limiter mechanism 42S operates with the load according to the second predetermined value.

  The first predetermined value and the second predetermined value may be set to substantially the same value. When a high signal is output from both the two-point buckle switch 44 and the auxiliary two-point buckle switch 44S to the control unit 41, the RAM 46 is referred to, the third predetermined value is read and output to the two-point switch 421, The fourth predetermined value is read and output to the auxiliary two-point switch 421S. In this case as well, the third predetermined value and the fourth predetermined value may be set to substantially the same value. Since the occupant M is supported by both the two-point side buckle switch 44 and the auxiliary two-point side buckle switch 44S, the third predetermined value and the fourth predetermined value are the first predetermined value and the second predetermined value when used alone. It is smaller than a predetermined value. The total value of the third predetermined value and the fourth predetermined value may be set to be approximately equal to the first predetermined value or the second predetermined value.

  FIG. 35 is a flowchart showing the procedure of the load control process. The control unit 41 determines whether or not a high signal is output from both the two-point buckle switch 44 and the auxiliary two-point buckle switch 44S (step S351). When it is determined that the high signal is not output from both sides (NO in step S351), the control unit 41 determines whether a high signal is output only from the two-point side buckle switch 44 (step S352). Here, when it is determined that the high signal is output only from the two-point buckle switch 44 (YES in step S352), the control unit 41 determines that only the two-point seat belt 20 is attached, and the RAM 46 The first predetermined value is read out from the data and output to the two-point switch 421 (step S353). As a result, the two-point side force limiter mechanism 42 operates with a load relating to the first predetermined value.

  If the control unit 41 does not determine that a high signal is output from only the two-point buckle switch 44 (NO in step S352), the control unit 41 determines that only the auxiliary two-point seat belt 20S is attached, and the RAM 46 A second predetermined value is read out from the auxiliary two-point switch 421S (step S354). As a result, the auxiliary two-point side force limiter mechanism 42S operates with a load relating to the second predetermined value.

  In step S351, when the control unit 41 determines that a high signal is output from both the two-point side buckle switch 44 and the auxiliary two-point side buckle switch 44S (YES in step S351), it reads the third predetermined value from the RAM 46 2 It outputs to the point side switch 421 (step S355). At the same time, the control unit 41 reads out the fourth predetermined value stored in advance in the RAM 46 and outputs it to the auxiliary two-point switch 421S (step S356). As a result, when both the two-point seat belt 20 and the auxiliary two-point seat belt 20S are mounted, the load on the two-point side force limiter mechanism 42 and the auxiliary two-point side force limiter mechanism 42S is reduced, and the occupant is appropriately It becomes possible to support with a heavy load.

  The seat belt device described above is a preferable example of the present invention, and other embodiments can be implemented or performed by various methods. The invention is not limited to the detailed shape, size, configuration, and the like of the parts shown in the accompanying drawings unless otherwise specified in the present specification. In addition, expressions and terms used in this specification are for the purpose of explanation, and are not limited thereto unless otherwise specified.

  The eleventh embodiment is configured as described above, and the other configurations and operations are the same as those of the first to tenth embodiments. Accordingly, the corresponding parts are denoted by the same reference numerals and detailed description thereof is omitted. To do.

(Appendix 1)
In a seat belt device in which a three-point seat belt and a two-point seat belt are arranged,
An anchor portion that can be fixed to a seat or a vehicle body and has a guide portion that guides webbing of the three-point seat belt;
A first engagement portion that is provided at one end of the webbing of the three-point seat belt and abuts against the anchor portion as the webbing moves;
A seat belt device comprising: a second engagement portion that is provided at one end of the webbing of the two-point seat belt and engages with the first engagement portion.

(Appendix 2)
The seat belt device according to appendix 1, wherein the first engagement portion is a tongue (or buckle) and the second engagement portion is a buckle (or tongue).

(Appendix 3)
A protrusion provided at a position facing the guide portion of the anchor portion;
The seatbelt device according to appendix 1 or 2, further comprising: an opening provided in the first engagement portion and detachable from the protrusion.

(Appendix 4)
A protrusion provided on the first engagement portion;
The seatbelt device according to appendix 1 or 2, further comprising: an opening provided at a position facing the guide portion of the anchor portion and detachable from the protrusion.

(Appendix 5)
The two-point seat belt is
A two-point retractor for winding the webbing;
Any one of Supplementary notes 1 to 4, further comprising: a two-point guide portion provided on one side of the sheet, guiding the webbing, and abutting on the second engagement portion as the webbing moves. The seat belt device according to one.

(Appendix 6)
The three-point seat belt is
A 3-point retractor for winding the webbing,
A three-point guide portion that is provided on the other side of the sheet and guides the webbing wound by the three-point retractor;
A three-point buckle provided on the vehicle body or seat on one side of the seat;
The seatbelt device according to any one of appendices 1 to 5, further comprising: a three-point tongue that is movably provided in the middle of the webbing and engages with the three-point buckle.

(Appendix 7)
A retractor that winds up the webbing that branches in halfway between the webbing of the three-point seat belt and the webbing of the two-point seat belt;
The three-point seat belt is
A three-point guide portion provided on the other side of the seat for guiding the webbing of the three-point seat belt;
A three-point buckle provided on the vehicle body or seat on one side of the seat;
A three-point tongue that is movably provided during the webbing and engages with the three-point buckle;
The two-point seat belt is
And a two-point guide portion that is provided on one side of the seat, guides the webbing of the two-point seat belt, and abuts on the second engagement portion as the webbing moves. The seat belt device according to any one of 1 to 4.

It is a typical front view which shows the structure of the seatbelt apparatus which concerns on this invention. FIG. 3 is a schematic front view showing a state in which an occupant wears a three-point seat belt. It is an enlarged view which shows the engagement state of a 2-point side tongue and a 2-point side buckle. It is a typical front view which shows the structure of the seatbelt apparatus which concerns on this invention. It is a typical side view showing composition at the time of seeing a seat belt device concerning the present invention from a crew member seating direction left side. It is a typical side view showing composition at the time of seeing a seat belt device concerning the present invention from a crew member seating direction right side. It is a block diagram which shows the hardware constitutions of the seatbelt apparatus which performs a load control process. It is a flowchart which shows the process sequence of load control. It is a flowchart which shows the process sequence of load control. FIG. 6 is a schematic front view showing a configuration of a seat belt device according to a second embodiment. FIG. 3 is a schematic front view showing a state in which an occupant wears a three-point seat belt. FIG. 6 is a schematic front view showing a configuration of a seat belt device according to a second embodiment. It is a typical side view which shows the structure at the time of seeing the seatbelt apparatus which concerns on Embodiment 2 from a passenger | crew seating direction left side. It is a typical side view which shows the structure at the time of seeing the seatbelt apparatus which concerns on Embodiment 2 from a passenger | crew seating direction right side. 10 is an enlarged view showing an engagement state between a first engagement portion and a second engagement portion according to Embodiment 3. FIG. It is an enlarged view which shows the engagement state of the 2-point side tongue and 2-point side buckle which concern on Embodiment 4. FIG. FIG. 10 is a schematic side view showing an engagement state between a two-point tongue and a two-point buckle according to Embodiment 4. It is a typical perspective view which shows the structure of the anchor part which concerns on Embodiment 5, and a two-point side tongue. It is a schematic diagram which shows the attachment structure of the anchor part which concerns on Embodiment 5, and a 2-point side tongue. It is a typical side view which shows the attachment structure of the anchor part which concerns on Embodiment 5, and a 2-point side tongue. It is a typical cross-sectional view which shows the attachment structure of a projection part and an opening part. It is a typical perspective view which shows the structure of the anchor part which concerns on Embodiment 6, and a two-point side tongue. It is a schematic diagram which shows the attachment structure of the anchor part which concerns on Embodiment 6, and a 2-point side tongue. FIG. 10 is a schematic diagram showing an engagement state between a two-point buckle and a two-point tongue according to a seventh embodiment. FIG. 16 is an enlarged view showing an engagement state between a two-point side tongue and a two-point side buckle according to an eighth embodiment. FIG. 10 is a schematic front view showing a configuration of a seat belt device according to an eighth embodiment. FIG. 10 is a schematic perspective view showing a configuration of a seat belt device according to a ninth embodiment. FIG. 22 is a block diagram illustrating a hardware configuration of a seat belt device that performs load control processing according to a tenth embodiment. It is explanatory drawing which shows the record layout of a 1st load table. It is explanatory drawing which shows the record layout of a 2nd load table. It is a flowchart which shows the procedure of a load control process. It is a flowchart which shows the procedure of a load control process. FIG. 20 is a schematic perspective view showing a configuration of a seat belt device according to an eleventh embodiment. It is a block diagram which shows the hardware constitutions of the seatbelt apparatus which performs a load control process. It is a flowchart which shows the procedure of a load control process.

Explanation of symbols

1 Seat cushion 2 Seat back 3 B pillar (vehicle body)
10 3-point seat belt 11 3-point retractor 12 3-point belt (webbing)
13 Shoulder anchor (3-point guide)
14 3 point side tongue 15 3 point side buckle 16 3 point side buckle plate 17 Anchor part 20 2 point type seat belt 21 2 point side retractor 22 2 point side belt (webbing)
23 2 point side guide part 24 2 point side tongue, 2 point side buckle (1st engaging part)
25 2-point side buckle, 2-point side tongue (second engagement part)
20S Auxiliary 2-point seat belt 21S Auxiliary 2-point retractor 22S Auxiliary 2-point belt (webbing)
23S Auxiliary 2-point side guide portion 24S Auxiliary 2-point side tongue 25S Auxiliary 2-point side buckle 33 3-point side guide portion 41 Control unit 42 2-point side force limiter mechanism 42S Auxiliary 2-point side force limiter mechanism 43 3-point side force limiter mechanism 44 2-point side buckle switch 44S Auxiliary 2-point side buckle switch 45 3-point side buckle switch 46 RAM
46P Control program 49 Collision prediction device 100 Seat belt device 171 Guide portion 173 Projection portion (opening portion)
245 Stop member 246 Opening (projection)
410 Collision detection device 411 Weight sensor 421 Two-point switch 421S Auxiliary two-point switch 431 Three-point switch 461 First load table 462 Second load table M Crew

Claims (4)

In a seat belt device having a first seat belt and a second seat belt,
First detecting means for detecting a wearing state of the first seat belt;
Second detection means for detecting the wearing state of the second seat belt;
A first force limiter mechanism that absorbs rotational force in a pulling-out direction of the webbing of the first seat belt when a load of a first predetermined value or more is applied to the first seat belt;
A second force limiter mechanism that absorbs rotational force in the pulling-out direction of the webbing of the second seat belt when a load of a second predetermined value or more is applied to the second seat belt;
Reduction means for reducing the first predetermined value when the first detection means detects the wearing of the first seat belt and the second detection means detects the wearing of the second seat belt. A seat belt device comprising: The seat belt device according to claim 1, wherein the first seat belt is a three-point seat belt, and the second seat belt is a two-point seat belt. An anchor portion that can be fixed to a seat or a vehicle body and has a guide portion that guides webbing of the three-point seat belt;
A first engagement portion that is provided at one end of the webbing of the three-point seat belt and abuts against the anchor portion as the webbing moves;
The seat belt device according to claim 2, further comprising: a second engagement portion that is provided at one end of the webbing of the two-point seat belt and engages with the first engagement portion. The first seat belt and the second seat belt are two-point seat belts,
The reducing means is
The first predetermined value and the second predetermined value are reduced when the first detecting means detects the wearing of the first seat belt and the second detecting means detects the wearing of the second seat belt. The seat belt device according to claim 1, wherein the seat belt device is configured as described above.

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