JP4858769B2 - Seat with seat belt device - Google Patents

Description

  The present invention relates to a seat provided with a seat belt device, and more particularly, to a vehicle seat incorporating a retractor of the seat belt device.

There is an automobile that employs a so-called sliding door in which the door is slidable in the longitudinal direction of the vehicle. In this sliding door vehicle, a so-called B-pillar is eliminated for the purpose of enhancing the feeling of opening when the vehicle gets on and off. Yes. Similarly, there is also known a vehicle in which front and rear doors are so-called double doors and the B-pillar is eliminated for the purpose of improving the ease of getting on and off the rear seat. In a vehicle that does not include such a B pillar, a retractor, a shoulder anchor, or the like of a seat belt device for a front seat cannot be provided on the B pillar.
In one-box vehicles and the like, the second row seat and the third row seat can be slid in the vehicle longitudinal direction for a long distance. In such a long slide seat, the C pillar or D In relation to the positional relationship between the pillar and the seat and the relationship with the slidable amount of the seat, it may not be appropriate to provide a retractor etc. for the C pillar and D pillar. It has been.

  In a so-called retractor-in type seat incorporating such a retractor, one end of the seat belt is attached to the retractor, and the other end of the seat belt extends upward from the retractor to the top of the seat back. The vehicle exits from the opening or the lead-out portion provided on the vehicle outer side portion to the outside of the seat back, and is fixed to, for example, an anchor provided on the vehicle outer side portion of the seat cushion. A hook member is attached to the seat belt between the anchor and the lead-out portion, and the hook member is detachably attached to a buckle fixed to a buckle anchor attached to a vehicle inner side portion of the seat. It has become.

  In the state where the occupant is wearing the seat belt, the portion of the seat belt extending between the pull-out portion at the top of the seat back and the hook member engaged with the buckle is sometimes referred to as a shoulder belt, and on the other hand, it is engaged with the buckle. A portion of the seat belt extending between the hook member thus formed and an anchor provided on the side of the seat on the outer side of the vehicle may be referred to as a lap belt.

  Many seat belt devices today employ a so-called pretensioner mechanism. In this pretensioner mechanism, the retractor locks the seat belt when the vehicle collides and the occupant moves forward so that the seat belt is fed out of the retractor at a predetermined speed.

  Furthermore, in recent years, the pretensioner mechanism has been provided on the vehicle inner side of the seat, rather than indirectly or secondaryly applying tension to the lap belt by winding the shoulder belt by operating the retractor. A lap pretensioner mechanism that directly applies tension to the lap belt by moving the buckle anchor away from the anchor provided on the outer side of the seat may be provided. Such a lap pretensioner mechanism helps to firmly restrain the occupant's waist around the seat, so that, for example, a small driver moves the driver's seat forward to take an appropriate driving posture. When the vehicle collides with the front, the occupant protection performance can be improved by suppressing the lower limbs from hitting the instrument panel or the like by a slight forward movement of the lower body.

  By the way, in a seat belt device in which a retractor is provided in a pillar and a seat belt extending from the retractor is supported by a shoulder anchor provided in the upper portion of the pillar, the seat belt is applied to the seat belt when the seat belt is pretensioned. In the retractor type seat without a pillar, the tensile load is large, but the shoulder is retracted when the conventional pretensioner mechanism / shoulder belt pretensioner mechanism that pulls the shoulder belt directly is operated. A load is applied to the leading portion of the seat back constituting the anchor, and the seat back is temporarily tilted forward. This principle will be schematically described with reference to FIG.

  In FIG. 7, “A” is the rotation axis of the seat back, “B” is the leading portion of the seat back constituting the shoulder anchor, “C” is the rearmost position of the seat belt in the seat cushion, and “D” is The shoulder contact position in contact with the passenger's shoulder is shown. When the retractor retracts the seat belt by the operation of the pretensioner mechanism, a force F1 is generated between the rearmost position C and the drawer portion B, and the force F1 is balanced between the drawer portion B and the shoulder contact position D. A force F2 is generated. Here, when the angle θ1 formed by the seat back center line E extending through the rotation axis A and the lead-out portion B and the force F2 is larger than the angle θ2 formed by the seat back center line E and the force F1, Since the vertical component force F1 is greater than the force component F2 with respect to the seat back center line E, the front vertical component force F3, which is a combination of these, increases, so the seat back seat cushion The periphery of the connecting part (hinge part) to the vehicle body side is deformed, and the seat back falls forward.

  In addition to this, when the wrap / pretensioner mechanism is operated, the lower end of the shoulder belt is pulled downward, forward, and inward in the vehicle width direction, so the seat back is pulled out via the drawer provided at the top. A force is generated that acts to tilt forward temporarily.

  Therefore, if the shoulder belt pretensioner mechanism and the lap pretensioner mechanism are operated simultaneously, the forward tilt displacement of the seat back becomes excessively large, and the position of the drawer portion that supports the load of the seat belt is temporarily greatly increased. It may move and hinder the occupant's restraint by the seat belt. In other words, when the drawer part moves forward at the time of a collision, the occupant is restrained relatively frontward by the seat belt as compared with the case where it does not move forward, and the occupant is positioned in the vehicle compartment in front of the seat. The possibility of coming into contact with the front object is increased. Further, the forward tilting operation of the seat back due to the operation of the pretensioner mechanism is more likely to occur in the standing state in which the seat back is substantially vertical than in the backward tilting state, and in this standing state, the occupant and the front object Since the separation distance is short, there is a problem that it is easier to contact the front object.

  In this regard, a method of providing additional rigidity to the seat so that the seat back is not displaced forward with respect to the tensile load of the seat belt due to the operation of the pretensioner mechanism is conceivable. It also increases the weight and manufacturing cost.

  Accordingly, the present invention has been invented to solve the above-described problem, and is a retractor-in type seat having a seat belt device including a shoulder belt pretensioner mechanism and a lap belt pretensioner mechanism. An object of the present invention is to provide a seat that suppresses the displacement of the seat back when the pretensioner mechanism is actuated.

  To achieve the above object, a seat including a seat belt device according to the present invention includes a seat cushion, and a seat back coupled to the seat cushion so as to be pivotable in the front-rear direction of the seat. The belt device includes a shoulder belt pretensioner mechanism including a first retractor installed at a position lower than an upper end portion of the seat back, and a seat belt extending from the first retractor is located above the upper end portion of the seat back. The seat, which is fixed to a drawer portion provided at an upper end portion of the seat back, which is not supported by a support body other than the seat, and which is provided at an upper end portion of the seat back, and a seat belt which is extended from the drawer portion. An anchor fixed to a support surface to which a cushion or the seat is attached, and the seat base between the anchor and the drawer portion A hook member attached to the seat, a buckle releasably engaged with the hook member, and connected to the seat cushion or the support surface; and the same height as or lower than the seat cushion or the seat cushion A lap belt pretensioner mechanism having a second retractor installed at a position, wherein the buckle is connected to a connecting member extending from the second retractor, and the shoulder belt pretensioner mechanism is moved to which the seat is attached. The seat belt is wound up by the first retractor when a body collides, and the lap belt pretensioner mechanism winds up the connecting member by the second retractor when the moving body collides. The shoulder belt pretensioner mechanism. And operation start timing of the retractor, the operation start timing of the second retractor by the lap belt pretensioner mechanism is set differently, characterized in that.

  In the present invention, since the operation start timing of the first retractor by the shoulder belt pretensioner mechanism and the operation start timing of the second retractor by the lap belt pretensioner mechanism are set to be different, the force for displacing the seat back, Alternatively, the force for deforming can be dispersed over time, so that the force that enters the seat back once can be suppressed.

In the present invention, the operation start timing of the second retractor by the lap belt pretensioner mechanism is set before the operation start timing of the first retractor by the shoulder belt pretensioner mechanism. preferable.
In this configuration, the vicinity of the occupant's waist can be restrained first, so that the occupant can be restrained stably on the seat.

Further, the seat cushion includes a seat portion having a seating surface, a base portion that connects the seat portion to the support surface, and a lifter mechanism that allows the seat portion to move up and down relative to the base portion, It is preferable that a 2 retractor is attached to the base portion of the seat cushion and has a downward displacement suppressing mechanism for suppressing downward displacement of the seat portion with respect to the base portion when the lap belt pretensioner mechanism is operated.
In this configuration, since the downward displacement suppressing mechanism is provided, it is possible to suppress the seat portion from being displaced downward relative to the base portion via the lifter mechanism when the pretensioner mechanism is operated.

  According to the present invention, in a retractor-in type seat having a seat belt device including a shoulder belt pre-tensioner mechanism and a lap belt pre-tensioner mechanism, the seat back is restrained from being displaced when the pre-tensioner mechanism is operated. Can be provided.

Hereinafter, an embodiment of an automobile seat according to the present invention will be described with reference to the accompanying drawings.
Referring to FIG. 1, the seat for the driver's seat located on the left side of the front seat of the automobile is indicated generally by the reference numeral 1. The seat 1 includes a seat cushion 10 and a seat back 30.

  As can be clearly understood from FIGS. 1, 2, and 4, the seat cushion 10 includes seat mount brackets 11 attached to the floor F of the vehicle at the four corners. A seat rail 12A extending between these is fixed to the right side (inward side in the vehicle width direction) / front seat mount bracket 11 of the seat 1 and the right / rear seat mount bracket 11 of the seat 1, and the seat rail 12A The seat rail 12B is fixed to the left side (vehicle width direction outer side) / front seat mount bracket 11 of the seat 1 and the left side / rear seat mount bracket 11 of the seat 1 so as to extend in parallel with each other.

  Each seat rail 12A, 12B comprises a hollow rectangular frame, as can be seen in FIG. 1, and a top slit is formed on the top surface over the entire length.

  A shaft extending in the vehicle width (seat width) direction is attached to the hollow inner lower portion of each seat rail 12A, 12B, and a roller 13 is rotatably attached to this shaft.

  In the hollow interior of each seat rail 12A, 12B, a slider 14 is provided that extends over almost the entire length of the seat rail 12A, 12B. The slider 14 has a fork extending in the vehicle width direction and includes a lower part supported by the roller 13 and an upper part extending upward from the top slits of the seat rails 12A and 12B. A plurality of ball bearings 15 are inserted into a space formed by the lower surfaces of the top walls of the seat rails 12A and 12B. Accordingly, the slider 14 can smoothly move in the vehicle front-rear direction with respect to the seat rails 12A and 12B.

  A cushion seat side frame, that is, a lower side frame 16 is connected to each slider 14 projecting upward from the seat rails 12A and 12B via a lifter mechanism described later. These lower side frames 16 are crossbars ( (Not shown). The lower side frame 16 and the cross bar are entirely covered with the cushion material and the skin 19. A horizontal support plate 18 also extends between the sliders 14 projecting upward from each seat rail 12A, 12B.

  As can be clearly seen in FIG. 4, each lower side frame 16 extends horizontally horizontally from the front portion of the seat cushion 10 to the rear and bends upward at the rear portion, and the rear upper end portion 16 </ b> A of each lower side frame 16 is The hinge shaft 20 extends upward through the cushion material and the skin 19 and connects the rear upper end portions 16 </ b> A of the lower side frames 16.

  When the seat back 30 is viewed from the front, the seat back 30 has a generally inverted U-shaped seat back frame 31. The seat back frame 31 includes an inner seat back frame 31A, an outer seat back frame 31B, And an upper frame 31C that connects the upper end portion of the vehicle interior seat back frame 31A and the upper end portion of the vehicle exterior seat back frame 31B. A support bracket 32 extending upward is fixed to an end portion on the vehicle outer side of the upper frame 31C, and an opening (not shown) extending through the support bracket 32 in the vertical direction is formed. The opening (not shown) is provided with a shaft (not shown) extending horizontally in the vehicle width direction, and a seat belt roller (not shown) is rotatably attached to the shaft.

  A lower end portion of the vehicle interior seat back frame 31A and a lower end portion of the vehicle exterior seat back frame 31B are disposed adjacent to the rear upper end portion 16A of each lower side frame 16, and are rotatably attached to the hinge shaft 20. . Accordingly, the seat back frame 31 can be rotated with respect to the lower side frame 16 so as to form an angle around the hinge shaft 20, that is, the seat back 30 is moved forward of the seat 1 with respect to the seat cushion 10. , Can be rotated backward.

  The seat back frame 31, a part of the support bracket 32, and a part of the rear upper end 16 </ b> A of the lower side frame 16 are covered with a cushion material and a skin 33.

  The seat 1 has a positioning mechanism, that is, a reclining mechanism (not shown) for releasably holding the seat back 30 at a desired angle with respect to the seat cushion 10. The reclining mechanism (not shown) includes a locking mechanism for locking the seat back frame 31 at a certain angle with respect to the hinge shaft 20 and a release mechanism for releasing the locking by the locking mechanism. The mechanism has a reclining lever (not shown) provided on the vehicle outer side portion of the seat cushion 10, and the reclining lever (not shown) is operated by an operating wire (not shown) only while it is operated. ) To unlock the seat back frame 31 from the hinge shaft 20.

The seat 1 further includes a seat belt device for restraining the occupant to the seat 1.
The seat belt device includes a retractor 50 that is fixed to the horizontal support plate 18 and accommodates the seat belt SB in a freely retractable manner. One end portion (not shown) of the seat belt SB is attached to the retractor 50, and the other end portion SB1 of the seat belt SB extends upward from the retractor 50 through the seat cushion 10 and the seat back 30 to support brackets. 32 is pulled out from the seat back 30 through an extraction portion, that is, an opening (not shown), and is fixed to an anchor 51 fixed to the vehicle outer side side portion of the seat cushion 10. In addition, a hook member 52 is attached to the seat belt 1 between the anchor 51 and the support bracket 32, and the hook member 52 is detachably attached to a buckle 53 disposed on the vehicle inner side side of the seat 1. It is like that. A guide tube may be installed in a path in the seat cushion 10 and the seat back 30 through which the seat belt SB extends.

  When the vehicle collides, the seat belt device winds the seat belt SB around the retractor 50 in advance before the seat bell SB is pulled out of the retractor 50 by the forward movement of the occupant of the seat 1 (shoulder belt). For) Pre-tensioner mechanism. The structure of the pretensioner mechanism itself is known, for example, a deceleration G sensor (not shown) for detecting the deceleration G of the vehicle, or the distance between the vehicle on which the seat 1 is provided and the front obstacle is detected. And a control device (not shown) connected to these sensors, and the control device (not shown) operates the retractor 50 based on a signal from the sensor. Thus, the seat belt SB is pulled (pretensioned) into the retractor 50 by a predetermined amount.

  In the seat 1, the retractor 50 includes a deceleration G sensor. When the deceleration G sensor is attached to the seat back 30, for example, when the seat back 30 is greatly inclined backward by a reclining operation, there is a possibility that the deceleration G cannot be accurately detected. Since the deceleration G sensor / retractor 50 is attached to the substantially horizontal horizontal support plate 18, the deceleration G can be detected more accurately.

  The seat belt device also has a lap belt pretensioner mechanism. The lap belt pretensioner mechanism has a second retractor 200 fixed to the horizontal support plate 18, and an inner end portion of the wire 201 is attached to the second retractor 200 so that the wire 201 can be wound up. Is fixed to the buckle 53. A cover 202 that covers the wire 201 extends from the second retractor 200 to the buckle 53. A lower portion 202A of the cover 202 extends from the second retractor 200 through the lower side frame 16 on the inner side in the vehicle width direction, and is attached to the outer surface of the lower side frame 16. The upper portion 202B of the cover 202, which is attached to the outer surface of the lower side frame 16 and extends upward from the upper edge of the lower portion 202A of the cover 202, constitutes a bellows that can be expanded and contracted in the vertical direction.

  The structure of the lap belt pretensioner mechanism is also known, and based on a signal from a sensor (not shown) for detecting a vehicle collision (prior to the occupant moving due to the collision). ) A control device (not shown) activates the second retractor 200 to draw the wire 201 into the retractor 200 by a predetermined amount, and thus restrains the occupant in advance by the lap belt via the buckle 53 / hook member 52. (Pre-tensioning). In this embodiment, the sensor and the control device constitute a shoulder belt pretensioner mechanism, and are connected to the aforementioned sensor for detecting a vehicle collision and the control device for controlling the retractor 50 (see FIG. They are shared with each other.

  The control device (not shown) converts the operation of the second retractor 200 by the lap belt pretensioner mechanism into the operation of the retractor 50 by the shoulder belt pretensioner mechanism when the collision of the vehicle is detected by the sensor. Prior to the start. Therefore, in the structure of the seat 1, when the vehicle collides, both the lap belt pretensioner mechanism and the shoulder belt pretensioner mechanism operate simultaneously, thereby causing the seat back 30 to be displaced forward and excessively. It is possible to avoid applying force at once.

  In this embodiment, the operation of the second retractor 200 by the lap belt pretensioner mechanism is started prior to the operation of the retractor 50 by the shoulder belt pretensioner mechanism. Therefore, when the vehicle collides, The lap belt pretensioner mechanism restrains the occupant's waist near the seat, and thus, compared to the case where the shoulder belt pretensioner mechanism is first activated to restrain the occupant's upper body to the seat, The occupant can be restrained to the seat more stably.

  Incidentally, as described above, the lower side frame 16 is coupled to the slider 14 via the lifter mechanism. Hereinafter, the lifter mechanism will be described.

  As shown in FIGS. 2 and 5, the lifter mechanism includes mounting plates 110 </ b> A and 110 </ b> B that protrude upward from the front and rear portions of each slider 14. On these mounting plates 110A and 110B, the lower end portion of the front link member 111A and the lower end portion of the rear link member 111B are rotatably attached via pins 110a and 110b, respectively, and the upper end portion of the front link member 111A, The upper end portion of the rear link member 111B is rotatably attached to the front end portion and the rear end portion of the lower side frame 16 via pins 112A and 112B, respectively.

  The first lifter mechanism portion of the lifter mechanism is configured by the front link member 111A and the rear link member 111B that connect the seat rail 12B located on the outer side in the vehicle width direction and the lower side frame 16, and the inner side in the vehicle width direction. The second lifter mechanism portion of the lifter mechanism is configured by the front link member 111A and the rear link member 111B that connect the seat rail 12A and the lower side frame 16 that are positioned at the front side.

  As can be seen clearly in FIG. 2, the rear link member 111B that connects the seat rail 12B located on the outer side in the vehicle width direction and the lower side frame 16 extends upward beyond the pin 112B. A rear end portion of the intermediate link member 113 is rotatably attached to the upper end portion of the rear link member 111B via a pin 113A, and the front end portion of the intermediate link member 113 has a pin 113B attached to the upper end portion of the sector gear member 114. It is attached so that it can rotate freely. The sector gear member 114 is rotatably attached to the lower side frame 16 via the shaft 114A below the pin 113A.

  The inner end portion of the winding spring 115 is fixed to the shaft 114A, and the outer end portion of the winding spring 115 is locked to a locking portion 114B provided at the lower portion of the sector gear member 114. The sector gear member 114 is also provided with teeth 116 on its front outer periphery.

  The lifter mechanism also includes a rotating shaft 120 that is rotatably attached to the lower side frame 16 on the outer side in the vehicle width direction above the shaft 114A and in front of the vehicle in the front-rear direction. The rotating shaft 120 extends through the lower side frame 16 in the vehicle width direction, and a lifter operation lever 121 is fixed to an outer end portion of the rotating shaft 120 in the vehicle width direction. On the other hand, a gear 122 is fixed to the inner end of the rotating shaft 120 in the vehicle width direction, and the gear 122 is disposed such that its teeth 122A engage with the teeth 116 of the sector gear member 114.

  Therefore, when viewed from FIG. 2, when the tip end of the lifter operation lever 121 is pulled up, the rotating shaft 120 is rotated counterclockwise, whereby the gear 122 rotates the sector gear member 114 clockwise around the shaft 114A. Rotate. When the sector gear member 114 is rotated clockwise around the shaft 114A, the rear link member 111B is rotated clockwise around the pin 110b via the intermediate link member 113. The rear part of the lower side frame 16 is moved forward and upward, and in conjunction with this, the front link member 111A is rotated clockwise around the pin 110a, so that the entire lower side frame 16 is moved forward. , Moved upward. Further, when the entire lower side frame 16 on the outer side in the vehicle width direction is moved forward and upward, the lower side frame 16 on the inner side in the vehicle width direction connected thereto by the crossbar and the horizontal support plate 18. Is also moved forward and upward, and as a result, the entire seat cushion 10 is moved forward and upward.

  As seen in FIG. 2, when the tip of the lifter operation lever 121 is pulled down, an operation opposite to the above-described operation occurs, and the seat cushion 10 is moved rearward and downward.

  As shown in FIG. 1, the rotary shaft 120 is provided with a drum brake 130 between the lower side frame 16 and the lifter operation lever 121. FIG. 3 shows the drum brake 130 in an exploded perspective view.

  The drum brake 130 includes an outer cylinder 131 and an inner cylinder 132, and a flange portion 131 b of the outer cylinder 131 is fixed to the outer surface of the lower side frame 16 with a rivet or the like. A pair of brake springs 133A and 133B are interposed between the outer cylinder 131 and the inner cylinder 132. The outer end 120 a of the rotating shaft 120 is supported by the center hole 131 a of the outer cylinder 131, and the inner end 120 b is rotatably supported by the lower side frame 16. A pinion 134 is rotatably attached to the middle portion of the rotary shaft 120. The outer end 120 a of the rotating shaft 120 is inserted through the center hole 132 a of the inner cylinder 132, and the inner cylinder 132 is fixed to the rotating shaft 120.

  The outer brake spring 133A has one end 133a locked to the notch 132c of the inner cylinder 132, the other end 133d locked to the slit 134a of the pinion 134, and the inner brake spring 133B has one end 133c The other end 133 b is locked to the notch 132 d of the inner cylinder 132 while being locked to the slit 134 a of the pinion 134.

  In the drum brake 130, when the rotary shaft 120 is rotated by the lifter operation lever 121, the end portions 133b and 133d (or 133c and 133a) of the brake springs 133A and 133B act in the direction of diameter reduction, so that the inner cylinder 132 is moved. Even when a force for rotating the pinion 134 is applied by the force acting on the seat cushion 10 while the rotation is possible, the ends 133c, 133a (or 133d, 133d, etc.) of the brake springs 133A, 133B are applied. 133b) is a known configuration that acts in the diameter-expanding direction and contacts the inner peripheral surface of the outer cylinder 131 to make the rotating shaft 120 unrotatable.

  In the seat 1 according to the present invention, the drum type brake 130 is combined with the above-described pretensioner mechanism to suppress the downward displacement of the lifter mechanism / seat cushion 10 due to the operation of the pretensioner mechanism. That is, the horizontal support plate 18 is fixed to the slider 14 that connects the seat 1 to the floor F and forms the base of the seat cushion 10, and the horizontal support plate 18 is provided with the retractors 50 and 200, whereby the shoulder belt and the lap belt are provided. When a tension is applied to the seat cushion 30, a downward load is applied to the seat back 30 and the seat cushion 10, and as a result, the seat cushion 10 is pushed down via the lifter mechanism, that is, there is a risk of being displaced downward. By adopting the drum type brake 130 together, the seat 1 prevents the shaft 120 from rotating due to the force acting on the seat cushion 10 / lifter mechanism, and thereby the seat cushion 10, particularly the drum type brake. 130, the width direction of the seat 1 It is possible to suppress the downward displacement of the first lifter mechanism of rectangular side.

  By the way, when the second lifter mechanism portion on the inner side in the vehicle width direction of the seat 1 is not provided with a mechanism for preventing such downward displacement, only the inner side in the vehicle width direction moves at the time of the frontal collision of the vehicle. (The entire seat 1 rotates around the outer side in the vehicle width direction, and thus the seat is deformed). And such movement of the seat also invites movement of the cover 202 provided on the inner side lower side frame 16 in the vehicle width direction, that is, the buckle anchor. In some areas this is regulated.

  Therefore, in order to prevent the seat 1 according to the present invention from moving the inner side in the vehicle width direction of the seat 1 without the drum brake 130 through the lifter mechanism (second lifter mechanism portion). A displacement suppression mechanism is provided.

  As shown in FIGS. 5 and 6, this displacement suppression mechanism is rotatably attached to a pin 112 </ b> B provided on the lower side frame 16 on the inner side in the vehicle width direction, and the upper end portion of the rear link member 111 </ b> B. Has a gear 170 fixed to the inner side surface in the vehicle width direction. An outer end portion of the pin 112B protruding outward from the lower side frame 16 in the vehicle width direction constitutes an enlarged diameter portion 171A, and an inner end portion of the pin 112B protruding inward in the vehicle width direction from the gear 170 is an enlarged diameter portion 171B. Configure.

  The vehicle inner lower side frame 16 is formed with a first slot 172 extending in the vehicle front-rear direction behind the gear 170 in the vehicle front-rear direction. In this first slot 172, the outer end portion of the locking pin 173 is supported, and the outer end portion of the locking pin 173 protruding inward in the vehicle width direction (outward of the seat 1) from the first slot 172 is the first slot. An enlarged diameter portion 173A larger than 172 is formed. An inner end portion of the locking pin 173 is supported by an extended vertical wall 174 extending from the vehicle inner lower side frame 16 by a second slot 175 formed facing the first slot 172. The inner end portion of the locking pin 173 that protrudes inward in the width direction constitutes an enlarged diameter portion 173 </ b> B larger than the second slot 175.

  A tension spring 176 is provided behind the locking pin 173 in the vehicle front-rear direction, and the tension spring 176 has a front end attached to the locking pin 173 and a rear end positioned behind the locking pin 173. The cushion 10 is attached at a proper position.

  In this displacement suppression mechanism, when the vehicle collides head-on, the locking pin 173 is moved forward in the first slot 172 and the second slot 175 against the force of the tension spring 176 by the inertial force, and the gear 170 The engaging pin 173 fits between the adjacent teeth 170A and 170A, and thus the locking pin 173 is fixed to the gear 170 in the vertical movement of the gear 170 by the combination of the first slot 172 and the second slot 175. The rotation of the rear link member 111B around the pin 110b is prevented, and consequently the rotation of the front link member 111A around the pin 110a and the movement of the seat 1 on the inner side in the vehicle width direction are prevented.

  The present invention is not limited to the above-described embodiments, and various modifications as described below are possible.

  For example, the seat 1 of the present invention includes not only a vehicle without a pillar provided with a retractor and a shoulder anchor of a seat belt device, but also the pillar, but can slide in the vehicle front-rear direction for a long distance. It can also be applied to long slide seats where it is not suitable to provide a number of advantages as described above.

  Moreover, in this embodiment, although the retractor 50 was installed in the seat cushion 10, not only this but a retractor can also be provided below the upper end part (a headrest is included) of a seat back. For example, the retractor may be installed on a seat back or a floor around the seat, and the seat belt may be applied to the upper end of the seat back.

  In any of the above-described embodiments, the example in which the seat 1 according to the present invention is applied to an automobile seat has been described. However, the seat according to the present invention can be applied to a sheet widely provided on a moving body such as a railcar seat. it can.

It is a schematic front view of the sheet | seat of embodiment by this invention. It is a schematic side view which shows the vehicle width direction outer side of the seat cushion of the seat of FIG. 1 from a seat inner side. FIG. 2 is a schematic exploded perspective view of a drum brake mechanism for the seat of FIG. 1. It is a schematic side view of the vehicle outer side of the seat of FIG. FIG. 2 is a schematic partial side view of the inside of the seat of FIG. 1. FIG. 6 is a schematic partial sectional view taken along line VI-VI in FIG. 5. It is a conceptual diagram which shows the principle by which a seat back is inclined forward at the time of a pretensioner mechanism action | operation.

Explanation of symbols

1 seat 10 seat cushion 30 seat back 50 retractor (first retractor)
SB Seat belt F Floor (support surface)
51 Anchor 52 Hook Member 53 Buckle 200 Second Retractor 201 Wire (Connecting Member)

Claims (3)

A seat with a seat belt device,
Seat cushions,
A seat back coupled to the seat cushion so as to be pivotable in the front-rear direction of the seat;
The seat belt device includes:
A shoulder belt pretensioner mechanism comprising a first retractor installed at a position lower than the upper end of the seat back;
A drawer portion provided at the upper end portion of the seat back, wherein the seat belt extending from the first retractor is supported by a support body other than the seat above the upper end portion of the seat back, and comes out in front of the seat back. When,
An anchor fixed to a seat belt that is fixed to the seat belt that has come out of the drawer, and fixed to a support surface to which the seat cushion or the seat is attached;
A hook member attached to the seat belt between the anchor and the drawer portion;
A buckle releasably engaged with the hook member and coupled to the seat cushion or the support surface;
A pretensioner mechanism for a lap belt provided with a second retractor installed at a position equal to or lower than the seat cushion or the seat cushion;
The shoulder belt pretensioner mechanism is configured to wind up the seat belt by the first retractor at the time of collision of the moving body to which the seat is attached, and the lap belt pretensioner mechanism is configured to collide with the moving body. Sometimes the second retractor winds up at least the seat belt between the hook member and the anchor,
The operation start timing of the first retractor by the shoulder belt pretensioner mechanism and the operation start timing of the second retractor by the lap belt pretensioner mechanism are set to be different from each other.
Sheet.   The seat according to claim 1, wherein an operation start time of the second retractor by the lap belt pretensioner mechanism is set before an operation start time of the first retractor by the shoulder belt pretensioner mechanism. The seat cushion includes a seat portion having a seating surface, a base portion that connects the seat portion to the support surface, and a lifter mechanism that allows the seat portion to move up and down with respect to the base portion,
The second retractor is attached to the base of the seat cushion;
A downward displacement suppression mechanism for suppressing downward displacement of the seat relative to the base when the lap belt pretensioner mechanism is activated;
The sheet according to claim 1 or 2.

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