JP2019151208A - Vehicle seat belt and vehicle seat - Google Patents

Abstract

To provide a technology that can facilitate operation of a vehicle seat belt device and simplify a structure.SOLUTION: A vehicle seat belt device 10 includes: a first seat belt 17 to which a tongue 19 is attached; a second seat belt 18 to which a buckle 20 capable of engaging with or disengaging from the tongue 19 is attached; and a common retractor 12 which takes up the first seat belt 17 and the second seat belt 18 in a manner that the first seat belt 17 and the second seat belt 18 can be drawn.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat belt device provided in a vehicle.

  Conventionally, as a seat belt device of this type, a retractor provided on one of the left and right sides of a vehicle seat, a seat belt that is retractably wound around the retractor, a tongue attached to the seat belt, and a vehicle seat There is known one provided with a buckle provided on the other side of the left and right sides so as to be able to engage with a tongue. In this seat belt device, the occupant pulls out the seat belt from the retractor when the belt is worn, and engages the tongue with the buckle, and releases the engagement between the tongue and the buckle when the belt is detached.

  In this seat belt device, it is necessary for the occupant to engage the buckle by moving the tongue in the pull-out direction of the seat belt to the engagement position with the buckle when the belt is worn. For this reason, there is a problem that the number of operations when the belt is attached is limited to one and there is no degree of freedom in the operations.

  Accordingly, in order to cope with this problem, a seat belt device as disclosed in Patent Document 1 below can be employed. In this seat belt device, both the left and right waist belts attached to the occupant seated on the vehicle seat can be wound and unwound by a retractor assigned thereto. Further, a tongue is attached to the right waist belt, and a buckle that can be engaged with the tongue is attached to the left waist belt.

According to this seat belt device, an occupant seated on a vehicle seat pulls the tongue to the engagement position with the buckle as necessary when the belt is worn, or pulls the buckle to the engagement position with the tongue. They can be engaged, or both the tongue and buckle can be pulled closer together to engage each other. In this case, the operation can be easily performed by providing a degree of freedom in the operation when the belt is attached.

JP 2014-177259 A

  However, although the above-described seat belt device is effective in facilitating the operation, the structure is complicated because it requires the same number of retractors as the left and right waist belts. For this reason, it is disadvantageous to reduce the cost, weight, and space of the seat belt device.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a technique capable of achieving both easy operation of the vehicle seat belt device and simplification of the structure.

One embodiment of the present invention provides:
A vehicle seat belt device provided in a vehicle,
A first seat belt to which a tongue is attached;
A second seat belt to which a buckle capable of engaging and disengaging with the tongue is attached;
A combined retractor for winding up each of the first seat belt and the second seat belt so as to be drawable;
A vehicle seat belt device comprising:
It is in.

Another aspect of the present invention provides:
A seat cushion on which an occupant can sit,
A seat belt module fixed to the lower surface of the seat cushion and for restraining an occupant seated on the seat cushion with a seat belt;
With
The seat belt module is configured by the vehicle seat belt device described above, a vehicle seat,
It is in.

  According to each aspect described above, in the vehicle seat belt device, one retractor is also used for the first seat belt and the second seat belt. For this reason, the number of retractors with respect to the seat belt can be reduced, and the structure of the vehicle seat belt device can be simplified.

  In this vehicle seat belt device, the first seat belt is pulled out from the retractor by pulling the tongue, and the second seat belt is pulled out from the retractor by pulling the buckle. Then, when the occupant engages the tongue with the buckle, the belt is put on. On the other hand, when the occupant releases the engagement between the tongue and the buckle, the belt is detached.

  Here, as an engagement operation when the belt is mounted, the occupant pulls the tongue to the engagement position with the buckle as necessary, or engages by pulling the buckle to the engagement position with the tongue. The engaging operation to be engaged and the engaging operation to be engaged with each other by pulling each of the tongue and the buckle closer to each other are possible. Therefore, the number of engagement operations when the belt is attached is not limited to one, and there is a degree of freedom, so that the occupant can easily operate the tongue and buckle as necessary. In particular, by pulling both the tongue and the buckle close to each other, the occupant can easily engage them while looking at the tongue and the buckle on the front side of the abdomen.

  Also, by pulling out the two seat belts at the same time, the load required to pull out the seat belt on one side is substantially halved. In this case, the occupant can pull out each of the two seat belts with a low load, and the pull-out operation is easy.

  In addition, by adopting a structure in which two seat belts are wound up by one retractor, the engagement portion between the tongue and the buckle can be automatically set on the front side of the abdomen of the occupant according to the winding load by the retractor. For this reason, it is not necessary for the occupant to twist the body to the left or right or move the head to the left or right when the belt is detached, and the engagement release operation between the tongue and the buckle can be easily performed on the front side of the abdomen.

  As described above, according to each aspect described above, it is possible to provide a technique capable of achieving both easy operation of the vehicle seat belt device and simplification of the structure.

1 is a perspective view of a vehicle seat according to a first embodiment. The side view which looked at the vehicle seat of Drawing 1 from the left. 1 is a perspective view of a vehicle seat belt device according to a first embodiment. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3 when the vehicle seat belt device is in an initial state. FIG. 5 is a cross-sectional view of the vehicle seat belt device in FIG. 4 when the seat belt is in a maximum pulled-out state. The figure which shows the cross-section of the spool in FIG. The perspective view of the state in which the infant as a passenger | crew sat down on the vehicle seat in FIG. FIG. 5 is a cross-sectional view of the vehicle seat belt device in FIG. 4 when in a belt-mounted state. The side view which shows the vehicle seat of FIG. 2 in the state which the infant sat down. FIG. 4 is a plan view schematically showing a vehicle seat belt device according to a second embodiment. The perspective view of the spool in FIG.

  Preferred embodiments of the above aspects will be described below.

In the above vehicle seat belt device, the retractor includes a spool that constitutes a winding shaft of the first seat belt and the second seat belt, and a belt winding mechanism that biases the spool in the belt winding direction. Have
The first seat belt is connected to the spool at a belt base end opposite to the belt front end to which the tongue is attached, and the second seat belt is a belt front end to which the buckle is attached. It is preferable that the belt base end portion on the opposite side is connected to the spool.

  According to this seat belt device, the tongue is pulled until the first seat belt is pulled out from the spool and is in the most extended state, and the buckle is pulled out until the second seat belt is pulled out from the spool and is in the most extended state. It becomes possible.

  In the above-described vehicle seat belt device, it is preferable that the belt base end portion of the first seat belt and the belt base end portion of the second seat belt are overlapped and joined to each other.

  According to this seat belt device, the two seat belts are wound on the spool of the retractor according to the winding load in the belt winding direction by the belt winding mechanism while being overlapped with each other. Against the spool of the retractor. In this case, since the two seat belts can be wound around the spool while being overlapped with each other, the spool can be reduced in size.

In the vehicle seat belt device, the retractor includes a case that houses the spool and is fixed to a seat cushion of the vehicle seat,
The case has a first pull-out hole for pulling out the first seat belt from the spool, and a second pull-out hole for pulling out the second seat belt from the spool. It is preferable that the first extraction hole and the second extraction hole are arranged on both sides in the left-right direction of the case in a fixed state.

  According to this seat belt device, when the retractor case is fixed to the seat cushion of the vehicle seat, the first seat belt wound around the spool is moved to one of the left and right directions through the first pull-out hole of the case. The second seat belt wound around the spool can be pulled out, and can be pulled out to the other in the left-right direction through the second pull-out hole of the case. Therefore, the two seat belts can be routed from the left and right with respect to the occupant seated on the vehicle seat.

  In the above vehicle seat belt device, the case is configured such that the positions of the first extraction hole and the second extraction hole are different in the vertical direction of the case while being fixed to the seat cushion. It is preferable.

  According to this seat belt device, in the retractor case, the first and second drawer holes are made to have different vertical positions so that the two seat belts wound around the spool are respectively reversed in the left and right directions. A structure that can be pulled out smoothly can be provided.

  In the above vehicle seat belt device, the case is fixed to the lower surface of the seat cushion via a plate member, and the plate member has the first drawn out from the first extraction hole of the case. It is preferable that a first insertion hole through which the seat belt passes and a second insertion hole through which the second seat belt pulled out from the second extraction hole of the case pass are provided.

  According to this seat belt device, the first seat belt drawn in one of the left and right directions from the first drawing hole of the retractor case can be guided to the upper surface side of the seat cushion through the first insertion hole of the plate member. In addition, the second seat belt pulled out from the second pull-out hole of the retractor case to the other in the left-right direction can be guided to the upper surface side of the seat cushion through the second insertion hole of the plate member. For this reason, the plate member used for fixing the retractor case to the seat cushion can also be used as a means for guiding each of the two seat belts.

  In the above vehicle seat belt device, the plate member has an inclined portion that is inclined so that the front end side is lower than the rear end side in a state of being fixed to the lower surface of the seat cushion, The case is fixed, the first insertion hole is disposed in front of the first extraction hole of the case, and the second insertion hole is disposed in front of the second extraction hole of the case. It is preferable to be configured as described above.

  According to this seat belt device, the first seat belt drawn in one of the left and right directions from the first drawing hole of the case can be guided obliquely upward and upward to the upper surface side of the seat cushion through the first insertion hole of the plate member. Further, the second seat belt pulled out from the second pull-out hole of the case to the other in the left-right direction can be guided obliquely upward and upward to the upper surface side of the seat cushion through the second insertion hole of the plate member. For this reason, the seatbelt apparatus excellent in the restraint property with respect to a passenger | crew's forward movement at the time of belt mounting can be provided.

In the above vehicle seat, the seat cushion has a through hole provided so that both the first seat belt and the second seat belt can be inserted in the vertical direction of the seat cushion.
The tongue is attached to the first seat belt drawn from the retractor to the upper surface side through the through hole of the seat cushion,
It is preferable that the buckle is attached to the second seat belt drawn from the retractor to the upper surface side through the through hole of the seat cushion.

  According to this vehicle seat, the two seat belts pulled out from the case of the retractor are both guided from the lower surface side to the upper surface side through the through hole of the seat cushion. For this reason, the length of the guide path for guiding the two seat belts from the retractor case to the upper surface side of the seat cushion can be kept short.

  In the vehicle seat, the through hole extends obliquely upward and forward from the lower surface side to the upper surface side of the seat cushion, and an opening on the upper surface of the seat cushion is provided in front of the retractor. Is preferred.

  According to this vehicle seat, both of the two seat belts pulled out from the retractor case are guided obliquely upward and forward from the lower surface side to the upper surface side through the through hole of the seat cushion. For this reason, the vehicle seat excellent in the restraint property with respect to a passenger | crew's forward movement at the time of belt mounting can be provided.

  In the above vehicle seat, the opening of the through hole is preferably provided in front of a virtual center line in the front-rear direction of the seat cushion.

  According to this vehicle seat, the tongue and the buckle are arranged around the side of the thigh of the occupant before the belt is mounted by providing the opening of the through hole in front of the center portion in the front-rear direction of the seat cushion. can do. For this reason, you are carrying your baggage on your back, hanging your baggage from your shoulders or neck, holding your baggage, or sitting in a tight position on the vehicle seat with a close distance to the next passenger. Even if it is a passenger | crew, this passenger | crew can find a tongue and a buckle easily by lowering a look to the side of a thigh, without twisting a body or turning diagonally back. For this reason, the visibility of the tongue and the buckle in the occupant when the belt is worn can be improved.

  In the above vehicle seat, the seat cushion is dimensioned so that a plurality of the occupants can sit side by side, and the seat belt module is fixed below the seating position of each occupant on the lower surface. preferable.

  In this case, both ease of operation of the vehicle seat belt device provided on the vehicle seat on which a plurality of passengers can sit side by side and simplification of the structure can be achieved.

  Hereinafter, an embodiment of a vehicle seat belt device (hereinafter also simply referred to as “seat belt device”) provided in a vehicle will be described with reference to the drawings.

  In the drawings for explaining the seat belt device, unless otherwise specified, the front is indicated by an arrow FR, the upper is indicated by an arrow UP, the right is indicated by an arrow RH, and the left is indicated by an arrow LH. The left-right direction is indicated by an arrow X, the up-down direction is indicated by an arrow Y, and the front-rear direction is indicated by an arrow Z. These directions and directions coincide with the directions and directions in the vehicle.

(Embodiment 1)
As shown in FIGS. 1 and 2, the vehicle seat 1 is mounted on a floor F of an infant-only vehicle as a vehicle. The vehicle seat 1 is a seat for three persons, and includes a seat cushion 2 that is dimensioned so that three infants as passengers can be seated side by side, and a seat back 7 that constitutes the backrest of each infant. ing. Both the seat cushion 2 and the seat back 7 are fixed to the floor F via the frame 8.

  The vehicle seat 1 has a smaller width dimension per person of the seat cushion 2 than that of a general car, and the ratio of the dimension in the vertical direction Y of the seat back 7 to the dimension in the front-rear direction Z of the seat cushion 2 is generally Bigger than that of a car. Moreover, the space | interval of the front-back direction of the two vehicle seats 1 which mutually adjoins is narrow compared with the thing of a general vehicle.

  The vehicle seat 1 includes three seat belt devices 10 that are fixed to the lower surface 2 b of the seat cushion 2. The seat belt device 10 according to the first embodiment is fixed below the seating position of each infant on the lower surface 2 b of the seat cushion 2. Each of the three seat belt devices 10 is configured as a seat belt module for restraining an infant seated on the upper surface 2 a of the seat cushion 2 with the two seat belts 17 and 18.

  The three seatbelt devices 10 are a first seatbelt device 10A that is a seatbelt device 10 corresponding to the left infant seating position and a second seatbelt 10 that is a seatbelt device 10 corresponding to the center infant seating position. The device is classified into a device 10B and a third seat belt device 10C, which is a seat belt device 10 corresponding to the right child's seating position (see FIG. 1).

  Each seat belt device 10 includes two seat belts 17 and 18 and a combined retractor 12 that winds up each of the two seat belts 17 and 18 so as to be drawable. That is, one retractor 12 is also used as two seat belts 17 and 18.

  One first seat belt 17 is provided with a metal tongue 19 having a plate shape. The other second seat belt 18 is attached with a buckle 20 that can engage and disengage the tongue 19. Both of these two seat belts 17 and 18 are configured as long webbing. The buckle 20 is provided with an operation button 21 for releasing the engagement with the tongue 19 so as to be pushed.

  The tongue 19 is engaged with the buckle 20 by being inserted into the insertion port 20a (see FIG. 2) and is locked. On the other hand, when the operation button 21 of the buckle 20 is operated, the tongue 19 in the locked state is released from the engagement with the buckle 20 and is unlocked from the insertion port 20a.

  In addition, it is preferable that the tongue 19 and the buckle 20 are dimensioned so as to be easily grasped even by an infant's hand. In addition, the tongue 19 and the buckle 20 are configured so that both an operation of inserting the tongue 19 into the buckle 20 and an operation of pressing the operation button 21 of the buckle 20 can be executed with an unreasonable force even for an infant. It is preferable.

  Here, the seat cushion 2 has four through holes 3, 4, 5, and 6 that are provided so that both of the two seat belts 17 and 18 can be inserted in the vertical direction Y of the seat cushion 2. These through holes 3, 4, 5, 6 are spaced apart in the left-right direction X, and are all provided at the same position in the front-rear direction Z.

  Although only the through hole 3 is shown in FIG. 2, these through holes 3, 4, 5, and 6 all extend diagonally forward from the lower surface 2 b side to the upper surface 2 a side of the seat cushion 2. In addition, an opening in the upper surface 2 a of the seat cushion 2 (opening 3 a in the through hole 3) is provided in front of the retractor 12. In particular, the opening is provided in front of the virtual center line M in the front-rear direction Z of the seat cushion 2.

  In the first seat belt device 10A, a tongue 19 is attached to a seat belt 17 drawn from the retractor 12 through the through hole 4 of the seat cushion 2 to the upper surface 2a side. A buckle 20 is attached to the seat belt 18 drawn from the retractor 12 through the through hole 3 of the seat cushion 2 to the upper surface 2a side.

  In the second seat belt device 10B, a tongue 19 is attached to the seat belt 17 drawn from the retractor 12 through the through hole 5 of the seat cushion 2 to the upper surface 2a side. A buckle 20 is attached to the seat belt 18 drawn from the retractor 12 through the through hole 4 of the seat cushion 2 to the upper surface 2a side.

  In the third seat belt device 10 </ b> C, a tongue 19 is attached to the seat belt 17 drawn from the retractor 12 through the through hole 6 of the seat cushion 2 to the upper surface 2 a side. A buckle 20 is attached to the seat belt 18 drawn from the retractor 12 through the through hole 5 of the seat cushion 2 to the upper surface 2a side.

  The through hole 4 of the seat cushion 2 is also used as a through hole for passing both the seat belt 17 of the first seat belt device 10A and the seat belt 18 of the second seat belt device 10B. The through hole 5 of the seat cushion 2 is also used as a through hole for passing both the seat belt 17 of the second seat belt device 10B and the seat belt 18 of the third seat belt device 10C.

Instead of such a structure, the seat belt 17 of the first seat belt device 10A and the seat belt 18 of the second seat belt device 10B are passed through different through holes, respectively, and the seat belt of the second seat belt device 10B. It is also possible to adopt a structure in which the seat belt 18 of the third seat belt device 10C and the seat belt 18 of the third seat belt device 10C are passed through different through holes.
Further, the number of through holes in the seat cushion 2 can be appropriately changed according to the number of seat belt devices 10 installed.

  Since the three seat belt devices 10 have the same structure, the first seat belt device 10A will be described as the seat belt device 10 and the second seat belt device 10B and the third seat belt device 10C will be described below. The description of is omitted.

  As shown in FIG. 3, in each seat belt device 10, the tongue 19 is attached to the belt front end portion 17 a of the seat belt 17, and the buckle 20 is attached to the belt front end portion 18 a of the seat belt 18. .

  The retractor 12 includes a spool 13, a belt winding mechanism 14, an ELR mechanism 15, and a case 16.

  The spool 13 is a cylindrical or columnar member that constitutes the take-up shaft of the two seat belts 17 and 18, and is configured to be rotatable around the rotation axis L.

  The belt winding mechanism 14 is configured to always elastically bias the spool 13 in the belt winding direction (direction indicated by D1 in FIG. 4) by a winding spring. For this reason, the two seat belts 17 and 18 are both retractor belts that are automatically wound around the spool 13 in accordance with the elastic biasing force of the winding spring with the external load released.

  These retractor belts can be adjusted appropriately without being affected by differences in infant's clothes, luggage, physique, etc. when wearing the belt, and can be disturbed by automatically winding the belt when leaving the seat. This is advantageous in that it can be prevented.

  The ELR mechanism 15 has a function of automatically locking the withdrawal of the seat belts 17 and 18 from the spool 13 when the seat belts 17 and 18 receive a strong impact in an emergency such as a collision. According to the ELR mechanism 15, the infant is not strongly restrained by the seat belts 17 and 18 in normal times, but the infant is strongly restrained by the seat belts 17 and 18 in an emergency. The retractor 12 having such an ELR mechanism 15 is also referred to as an “emergency lock type winding device”.

  The case 16 of the retractor 12 accommodates the spool 13 and is configured to be fixed to the lower surface 2 b of the seat cushion 2 of the vehicle seat 1 via the plate member 11.

  The plate member 11 has a first insertion hole 11a through which the seat belt 17 drawn from the first drawing hole 16a (see FIG. 4) of the case 16 passes, and a seat belt 18 drawn from the second drawing hole 16b of the case 16. And a second insertion hole 11b through which is passed. In the plate member 11, the first insertion hole 11 a is disposed in front of the first extraction hole 16 a of the case 16, and the second insertion hole 11 b is disposed in front of the second extraction hole 16 b of the case 16. .

  The plate member 11 has an inclined portion 11c that is inclined so that the front end side is lower than the rear end side in a state where the plate member 11 is fixed to the lower surface 2b of the seat cushion 2, and the case 16 is fixed to the back surface of the inclined portion 11c. ing. For this reason, when the retractor 12 is fixed to the lower surface 2b of the seat cushion 2 via the plate member 11, the spool 13 is disposed so as to be inclined such that the front end side is lower than the rear end side, and the rotation axis L is in the horizontal direction. It is set in a state tilted with respect to.

  As shown in FIG. 4, the case 16 has a first extraction hole 16 a for extracting the seat belt 17 from the spool 13 and a second extraction hole 16 b for extracting the seat belt 18 from the spool 13.

The case 16 is configured such that the positions of the first extraction hole 16 a and the second extraction hole 16 b are different in the vertical direction Y of the case 16 while being fixed to the seat cushion 2. That is, in this case 16, the first extraction hole 16a is arranged at a lower position in the vertical direction Y than the second extraction hole 16b.
Note that, if necessary, such an arrangement can be changed to an arrangement in which the second extraction hole 16b is at a lower position in the vertical direction Y than the first extraction hole 16a.

  When the seat belt device 10 is in the initial state P1, the spool 13 is urged by the belt winding mechanism 14 in the belt winding direction D1. At this time, the two seat belts 17 and 18 are wound around the spool 13 while being overlapped with each other, and each receives a tensile load in the belt winding direction D1.

  For this reason, the tongue 19 is held near the through hole 4 of the seat cushion 2 by the tension of the seat belt 17, and the buckle 20 is held near the through hole 3 of the seat cushion 2 by the tension of the seat belt 18.

  On the other hand, when the tongue 19 is pulled by an external load against the tension of the seat belt 17 or the buckle 20 is pulled by an external load against the tension of the seat belt 18, the spool 13 is pulled in the belt pulling direction. The seat belts 17 and 18 are pulled out by rotating to D2. Then, the seat belt device 10 can be set to the maximum pull-out state P2 as shown in FIG.

  As shown in FIG. 5, the seat belt 17 is connected to the spool 13 at a belt base end portion 17b opposite to the belt front end portion 17a to which the tongue 19 is attached. The seat belt 18 is connected to the spool 13 at a belt base end 18b opposite to the belt front end 18a to which the buckle 20 is attached.

  As shown in FIG. 6, the outer surface 13 a of the spool 13 serves as a winding surface for the two seat belts 17 and 18. A cylindrical shaft core member 13 c is accommodated in the internal space 13 b of the spool 13. Here, the two seat belts 17 and 18 are constituted by one long belt member. That is, the seat belt 17 corresponds to a first belt portion that is a part of the belt member, and the seat belt 18 corresponds to a second belt portion that is a remaining portion of the belt member.

  In the inner space 13b, the belt member is wound around the shaft core member 13c, and the belt base end portion 17b of the seat belt 17 and the belt base end portion 18b of the seat belt 18 are overlapped and stitched together. Are joined by. In this case, the stitching portion 22 is disposed in the internal space 13 b of the spool 13.

  In the inner space 13b of the spool 13, only the belt member is wound around the shaft core member 13c, and the belt base end portion 17b of the seat belt 17 and the belt base end portion 18b of the seat belt 18 are connected to the outside of the spool 13. You may make it overlap and sew together. In this case, the stitching portion 22 is disposed outside the spool 13.

  As a means for joining the belt base end portion 17b of the seat belt 17 and the belt base end portion 18b of the seat belt 18, instead of or in addition to stitching, adhesion, riveting, or the like can be used.

  Alternatively, the two seat belts 17 and 18 may be configured by two separate belt members, and each seat belt (belt member) may be independently connected to the spool 13. In this case, a structure may be employed in which the belt base end portion 17b of the seat belt 17 and the belt base end portion 18b of the seat belt 18 are overlapped with each other and stitched (joined), or each seat belt is connected to the spool 13. Alternatively, a structure that does not sew (join) the other seat belt may be employed. Moreover, about the structure which connects the two seatbelts 17 and 18 to the spool 13, another structure can also be employ | adopted as needed.

  Next, the belt wearing state P3 of the seat belt device 10 having the above-described configuration will be described with reference to FIGS.

  As shown in FIG. 7, the infant C seated on the upper surface 2a of the seat cushion 2 of the vehicle seat 1 engages the tongue 19 and the buckle 20 with each other when the belt is worn. Thereby, the seatbelt apparatus 10 will be in the belt mounting state P3. On the other hand, when the infant C releases the engagement between the tongue 19 and the buckle 20, the belt is detached.

  The infant C performs an engaging operation for engaging the tongue 19 and the buckle 20 as an operation at the time of wearing the belt. At this time, an operation of grasping the tongue 19 and pulling it to the engagement position with the buckle 20 (hereinafter referred to as “first engagement operation”) and an engagement with the tongue 19 by grasping the buckle 20. An operation (hereinafter referred to as “second engagement operation”) for pulling to the mating position and an operation for pulling and engaging both the tongue 19 and the buckle 20 so as to approach each other (hereinafter referred to as “second engagement operation”). , “Third engagement operation”) is selected.

  For example, in the first engagement operation, the tongue 19 is pulled toward the buckle 20 against the winding load F in the belt winding direction D1 according to the elastic biasing force of the winding spring of the belt winding mechanism 14. . When the tongue 19 is engaged with the buckle 20, the seat belt 17 drawn from the spool 13 is in a tensioned state, while the seat belt 18 drawn from the spool 13 is temporarily slackened. become. Thereafter, the tongue 19 and the buckle 20 are released from being gripped by the infant C, and are centered on the center portion in the left-right direction X of the body of the infant C (front side of the abdomen) while eliminating the slack of the seat belt 18.

  Similarly, in the second engagement operation, the buckle 20 is pulled toward the tongue 19 against the winding load F described above. When the buckle 20 is engaged with the tongue 19, the seat belt 18 pulled out from the spool 13 is in a tensioned state. Thereafter, the tongue 19 and the buckle 20 are released from being gripped by the infant C, and are centered in the center in the left-right direction X of the body of the infant C while eliminating the slack of the seat belt 17.

  In the third engagement operation, both the tongue 19 and the buckle 20 are pulled against each other against the winding load F described above. At this time, the load required to pull out the two seat belts 17 and 18 is substantially half of the take-up load F. When the tongue 19 and the buckle 20 are engaged with each other, the two seat belts 17 and 18 drawn from the spool 13 are both stretched. When the tongue 19 and the buckle 20 are engaged with each other at the center of the body of the infant C, the tongue 19 and the buckle 20 remain in the position with little movement even when released from the grip by the infant C.

  In this way, by adopting a structure in which the two seat belts 17 and 18 are wound by the single retractor 12, the tongue 19 engaged with each other regardless of which of the above three engagement operations is selected by the infant C. The buckle 20 moves so as to be automatically centered in the center in the left-right direction X of the body of the infant C.

  As shown in FIG. 8, after the belt is mounted, the seat belt 17 and the tongue 19 receive a tensile load Fa in the belt winding direction D <b> 1 from the spool 13 of the retractor 12. Further, the seat belt 18 and the buckle 20 receive a tensile load Fb in the belt winding direction D <b> 1 from the spool 13 of the retractor 12. Both of the two tensile loads Fa and Fb are substantially half of the winding load F described above. That is, the sum of the tensile load Fa and the tensile load Fb corresponds to the value of the winding load F.

  As shown in FIG. 9, the abdomen of the infant C is restrained by the seat belts 17 and 18 after the belt is attached. During normal times when the ELR mechanism 15 is not operating, the seat belts 17 and 18 are allowed to be pulled out in accordance with the movement of the infant C's body, so the restraining force of the infant C by the seat belts 17 and 18 is not strong. On the other hand, when the ELR mechanism 15 is activated and the drawers of the seat belts 17 and 18 are locked in an emergency, the restraining force of the infant C by the seat belts 17 and 18 is increased.

  After the belt of the seat belt device 10 is worn, the buckle 20 is located at the center of the body of the infant C. This position is a position where the infant C naturally enters the field of view when the eyes are lowered. For this reason, the infant C can easily recognize that the belt is worn by directing his / her eyes downward. Further, at this time, the operation button 21 of the buckle 20 can be grasped in the field of view, and when the operation button 21 is pressed when the belt is attached or detached, the operation button 21 can be easily operated with the line of sight directly below. it can.

  Below, the effect of the above-mentioned Embodiment 1 is demonstrated.

  According to the first embodiment described above, in the seat belt device 10 fixed to the vehicle seat 1, one retractor 12 is also used for the two seat belts 17 and 18. For this reason, the number of the retractors 12 with respect to the seat belts 17 and 18 can be reduced, and the structure of the seat belt device 10 can be simplified. In this case, it is advantageous to reduce the cost, weight, and space of the seat belt device 10.

  In the seat belt device 10, the infant C can selectively perform the operation at the time of wearing the belt from among the three engagement operations. Therefore, since the engagement operation at the time of wearing the belt is not limited to one and there is a degree of freedom, the infant C can easily operate the tongue 19 and the buckle 20 as necessary. In particular, by pulling both the tongue 19 and the buckle 20 close to each other, the infant C can easily engage them while looking at the tongue 19 and the buckle 20 on the front side of the abdomen. For example, even an infant C who is not familiar with the operation when wearing the belt can easily perform this operation.

  Further, by pulling out the two seat belts 17 and 18 simultaneously, the load required to pull out the seat belt on one side is halved. In this case, the infant C can pull out each of the two seat belts 17 and 18 with a low load, and the pull-out operation is easy.

  In addition, by adopting a structure in which the two seat belts 17 and 18 are wound up by one retractor 12, the engagement portion between the tongue 19 and the buckle 20 is placed on the front side of the abdomen of the infant C according to the winding load by the retractor 12. Can be set automatically. For this reason, the infant C does not need to twist the body to the left or right or move the head to the left or right when the belt is detached, and can easily perform the disengagement operation between the tongue 19 and the buckle 20 on the front side of the abdomen. . For example, even an infant C who is not accustomed to the operation at the time of belt removal can easily perform this operation.

  As described above, according to the above-described first embodiment, there is provided a technique capable of both simplifying the operation and simplifying the structure of the seat belt device 10 provided on the vehicle seat 1 on which a plurality of occupants C can sit side by side. can do.

  According to the seat belt device 10 described above, the seat belt 17 is connected to the spool 13 at the belt base end portion 17b, and the seat belt 18 is connected to the spool 13 at the belt base end portion 18b. It is possible to pull the tongue 19 until it is pulled out from 13 and is in the most extended state, and pull the buckle 20 until the seat belt 18 is pulled out from the spool 13 and is in the most extended state.

  According to the seat belt device 10 described above, the two seat belts 17 and 18 are overlapped with each other on the spool 13 of the retractor 12 according to the winding load F in the belt winding direction D1 by the belt winding mechanism 14. On the other hand, it is pulled out from the spool 13 of the retractor 12 against the winding load F. In this case, since the two seat belts 17 and 18 can be wound around the spool 13 in a state of being overlapped with each other, the spool 13 can be reduced in size.

  According to the above-described seat belt device 10, when the case 16 of the retractor 12 is fixed to the seat cushion 2 of the vehicle seat 1, the seat belt 17 wound around the spool 13 is removed from the case 16. The seat belt 18 wound around the spool 13 can be pulled out to the other side in the left-right direction through the second pull-out hole 16 b of the case 16. For this reason, the two seat belts 17 and 18 can be drawn from the left and right with respect to the infant C seated on the vehicle seat 1.

  According to the seat belt device 10 described above, the two seats wound around the spool 13 can be obtained by making the vertical positions of the first extraction hole 16a and the second extraction hole 16b different in the case 16 of the retractor 12. It is possible to provide a structure in which the belts 17 and 18 can be pulled out smoothly in opposite directions.

  According to the seat belt device 10 described above, the upper surface of the seat cushion 2 is pulled through the first insertion hole 11a of the plate member 11 from the first extraction hole 16a of the case 16 of the retractor 12 to the one side in the left-right direction. Can be guided diagonally upwards to the 2a side. Further, the seat belt 18 pulled out from the second pull-out hole 16b of the case 16 of the retractor 12 to the other in the left-right direction is guided upward and obliquely forward to the upper surface 2a side of the seat cushion 2 through the second insertion hole 11b of the plate member 11. it can. For this reason, the plate member 11 used for fixing the case 16 of the retractor 12 to the seat cushion 2 can be used as a means for guiding each of the two seat belts 17 and 18. Moreover, the seatbelt apparatus 10 excellent in the restraint property with respect to the forward movement of the infant C at the time of belt mounting can be provided.

  According to the vehicle seat 1 described above, the two seat belts 17 and 18 pulled out from the case 16 of the retractor 12 are both viewed from the lower surface 2b side through any of the through holes 3, 4, 5 and 6 of the seat cushion 2. Guided to the upper surface 2a side. For this reason, the length of the guide path for guiding the two seat belts 17 and 18 from the case 16 of the retractor 12 to the upper surface 2a side of the seat cushion 2 can be reduced.

  According to the vehicle seat 1 described above, the two seat belts 17 and 18 drawn out from the case of the retractor 12 are both upper surfaces from the lower surface 2b side through any of the through holes 3, 4, 5 and 6 of the seat cushion 2. It is guided diagonally up and forward to the 2a side. For this reason, the vehicle seat 1 excellent in the restraint property with respect to the forward movement of the infant C at the time of belt wearing can be provided.

  According to the vehicle seat 1 described above, the opening on the upper surface 2a of the seat cushion 2 in the through holes 3, 4, 5 and 6 is provided in front of the center portion in the front-rear direction Z of the seat cushion 2, thereby providing a tongue. Both 19 and the buckle 20 can be arranged around the side of the thigh of the infant C before the belt is attached. For this reason, carry your baggage on your back, hang your baggage from your shoulders or neck, hold your baggage, or sit in a cramped posture on a vehicle seat with a close distance to the infant C next to you. Even if an infant C is present, the infant C can easily find the tongue 19 and the buckle 20 by lowering the line of sight to the side of the thigh without twisting the body or turning diagonally backward. it can. For this reason, the visibility of the tongue 19 and the buckle 20 in the infant C when the belt is worn can be improved.

  Next, another embodiment related to the first embodiment will be described with reference to the drawings. In other embodiments, the same elements as those of the first embodiment are denoted by the same reference numerals, and the description of the same elements is omitted.

(Embodiment 2)
As shown in FIG. 10, in the seat belt device 110 of the second embodiment, only the structure of the retractor 112 is different from the structure of the retractor 12 of the seat belt device 10 of the first embodiment.
Other configurations are the same as those of the first embodiment.

  As shown in FIGS. 10 and 11, the spool 113 constituting the retractor 112 has two winding surfaces 113 a and 113 b adjacent to each other, and is configured to be rotatable around the rotation axis L. In the retractor 112, the seat belt 17 is wound around the winding surface 113a of the spool 113 so that it can be pulled out, and the seat belt 18 is wound around the winding surface 113b of the spool 113 so that it can be pulled out.

According to the seat belt device 110 of the second embodiment, since the spool 113 of the retractor 112 includes the two winding surfaces 113a and 113b, when the two seat belts 17 and 18 are pulled out of the spool 113 or wound on the spool 113, Are less likely to interfere with each other.
In addition, the same effects as those of the first embodiment are obtained.

  The present invention is not limited only to the above-described embodiments, and various applications and modifications can be considered without departing from the object of the present invention. For example, the following embodiments applying the above-described embodiment can be implemented.

  In the above-described embodiment, the case where the two seat belts 17 and 18 are wound by the single retractor 12 is illustrated as an example, but instead of this, in addition to the two seat belts 17 and 18, one or more The retractor 12 can also be used to wind up the seat belt. In this case, a plurality of seat belts including the two seat belts 17 and 18 can be wound up so that they can be pulled out by one retractor 12.

  In the above-described embodiment, the case where the seat belt devices 10 and 110 are fixed to the vehicle seat 1 for three persons is illustrated. However, the seat belt devices 10 and 110 are fixed to the vehicle seat for one person or two persons. You can also

  In the above-described embodiment, the first extraction hole 16a and the second extraction hole 16b are provided on both sides in the left-right direction X of the case 16 of the retractor 12, and the positions of the first extraction hole 16a and the second extraction hole 16b in the vertical direction Y are provided. However, the positions of the first extraction hole 16a and the second extraction hole 16b are not limited to this, and can be changed as necessary.

  In the above-described embodiment, the case where the inclined portion 11c is provided in the plate member 11 has been exemplified. However, instead of this, the inclined portion 11c is omitted, and the entire plate member 11 extends along the horizontal plane. It can also be adopted.

  In the above-described embodiment, the case 16 of the retractor 12 is illustrated as being fixed to the lower surface 2b of the seat cushion 2 of the vehicle seat 1 via the plate member 11, but instead, the case 16 of the seat cushion 2 is fixed. A structure that is directly fixed to the lower surface 2b may be employed.

  Further, instead of the structure in which the case 16 of the retractor 12 is fixed to the lower surface 2b of the seat cushion 2, a structure in which the case 16 is fixed to the side surface of the seat cushion 2 via the plate member 11 or directly is adopted. You can also.

In the above-described embodiment, all of the through holes 3, 4, 5, 6 provided in the seat cushion 2 of the vehicle seat 1 extend obliquely upward and forward from the lower surface 2b side of the seat cushion 2 to the upper surface 2a side. However, the extending direction of the through holes 3, 4, 5, 6 is not limited to this, and can be changed to extend in the vertical direction Y, for example.
Moreover, the position of the opening part in the upper surface 2a of the seat cushion 2 of these through holes 3, 4, 5 and 6 is not limited only to the position in front of the virtual center line M, and may be appropriately determined as necessary. It can be changed.

  In the above-described embodiment, the seat belt devices 10 and 110 provided on the vehicle seat 1 of the infant-only vehicle are illustrated. However, the structure of the seat belt devices 10 and 110 is the seat belt device provided on the vehicle seat of the commercial vehicle. It can also be applied to structures.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 2a Upper surface 2b Lower surface 3, 4, 5, 6 Through-hole 3a Opening part 10,110 Vehicle seat belt apparatus (seat belt module)
DESCRIPTION OF SYMBOLS 10A 1st seatbelt apparatus 10B 2nd seatbelt apparatus 10C 3rd seatbelt apparatus 11 Plate member 11a 1st insertion hole 11b 2nd insertion hole 11c Inclination part 12,112 Retractor 13,113 Spool 14 Belt winding mechanism 16 Case 16a First extraction hole
16b Second extraction hole 17 First seat belt (seat belt)
17a, 18a Belt tip 17b, 18b Belt base 18 Second seat belt (seat belt)
19 tongue 20 buckle C infant (occupant)
D1 Belt winding direction M Virtual center line X Left-right direction Y Up-down direction Z Front-back direction

Claims (12)

A vehicle seat belt device provided in a vehicle,
A first seat belt to which a tongue is attached;
A second seat belt to which a buckle capable of engaging and disengaging with the tongue is attached;
A combined retractor for winding up each of the first seat belt and the second seat belt so as to be drawable;
A vehicle seat belt device comprising: The retractor includes a spool that forms a winding shaft of the first seat belt and the second seat belt, and a belt winding mechanism that urges the spool in a belt winding direction.
The first seat belt is connected to the spool at a belt base end opposite to the belt front end to which the tongue is attached, and the second seat belt is a belt front end to which the buckle is attached. The vehicle seat belt device according to claim 1, wherein the vehicle seat belt device is connected to the spool at an opposite belt base end.   The vehicle seat belt device according to claim 2, wherein the belt base end portion of the first seat belt and the belt base end portion of the second seat belt are overlapped and joined to each other. The retractor has a case that accommodates the spool and is fixed to a seat cushion of a vehicle seat,
The case has a first pull-out hole for pulling out the first seat belt from the spool, and a second pull-out hole for pulling out the second seat belt from the spool. 4. The vehicle seat belt device according to claim 2, wherein the first extraction hole and the second extraction hole are arranged on both sides in the left-right direction of the case in a fixed state. 5.   The said case is comprised so that the position of the said 1st drawer hole and the said 2nd drawer hole may differ in the up-down direction of the said case in the state fixed with respect to the said seat cushion. Vehicle seat belt device.   The case is fixed to the lower surface of the seat cushion via a plate member, and the plate member has a first insertion hole through which the first seat belt pulled out from the first pull-out hole of the case passes. The vehicle seat belt device according to claim 4, further comprising: a second insertion hole through which the second seat belt pulled out from the second pull-out hole of the case passes.   The plate member has an inclined portion that is inclined so that a front end side is lower than a rear end side in a state of being fixed to the lower surface of the seat cushion, and the case is fixed to the inclined portion, and the case The first insertion hole is disposed in front of the first extraction hole, and the second insertion hole is disposed in front of the second extraction hole of the case. The vehicle seat belt device according to claim 6. A seat cushion on which an occupant can sit,
A seat belt module fixed to the lower surface of the seat cushion and for restraining an occupant seated on the seat cushion with a seat belt;
With
The said seat belt module is a vehicle seat comprised by the vehicle seat belt apparatus as described in any one of Claims 1-7. The seat cushion has a through hole provided so that both the first seat belt and the second seat belt can be inserted in the vertical direction of the seat cushion.
The tongue is attached to the first seat belt drawn from the retractor to the upper surface side through the through hole of the seat cushion,
The vehicle seat according to claim 8, wherein the buckle is attached to the second seat belt that is pulled out from the retractor to the upper surface side through the through hole of the seat cushion.   The through hole extends obliquely upward and forward from the lower surface side to the upper surface side of the seat cushion, and an opening in the upper surface of the seat cushion is provided in front of the retractor. Vehicle seats.   The vehicle seat according to claim 10, wherein the opening of the through hole is provided in front of a virtual center line in the front-rear direction of the seat cushion.   The seat cushion is dimensioned so that a plurality of the occupants can sit side by side, and the seat belt module is fixed below the seating position of each occupant on the lower surface. The vehicle seat according to claim 1.

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