JP2017218118A - Seat belt device and tongue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat belt device capable of absorbing shocks by gradually increasing the length of a shoulder webbing on a tongue side when a load applied on the shoulder webbing becomes a prescribed value or higher in vehicle emergency, and a tongue thereof.SOLUTION: When an occupant seated on a seat fixes a tongue to a buckle, a shoulder webbing 2 and a lap webbing 3 are laid along the occupant. When a collision is predicted, a pretensioner of a retractor is operated to add pretension to the webbings 2 and 3. When a load applied on the shoulder webbing 2 becomes a prescribed value or higher due to vehicle collision, the columnar part of a torsion bar is plastically deformed, a shaft rod 17 is rotated, and the shoulder webbing 2 is pulled out. Shocks are absorbed through the plastic deformation of the torsion bar.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a seat belt device for restraining the body of a vehicle occupant with a webbing and a tongue thereof, and more particularly to a seat belt device in which a shoulder webbing and a lap webbing are separated and a tongue thereof.

  A vehicle such as an automobile is provided with a seat belt device for restraining an occupant during a collision or the like. As such a seat belt device, there is a three-point seat belt device using a webbing continuous from a lap side to a shoulder side.

  In this three-point seat belt device, one end of the webbing is locked to a take-up shaft provided on the retractor, and the other end is locked to an anchor plate. The webbing is passed through a slip joint fixed to the upper part of the center pillar. A tong is passed between the anchor plate of the webbing and the slip joint. The webbing is put into the mounted state by engaging the tongue with the buckle disposed on the side of the seat. In this state, shoulder webbing (webbing closer to the slip joint than the tongue) restrains the upper body of the occupant. The lap webbing, that is, the webbing between the tongue and the anchor plate restrains the occupant's waist.

  In the event of an emergency such as a vehicle collision, when the webbing is prevented from being pulled out by the retractor locking mechanism and the load applied to the shoulder webbing exceeds a predetermined level, the retractor allows the webbing to be pulled out by a predetermined amount so that the shoulder belt portion of the webbing There is a retractor equipped with a mechanism (“force limiter mechanism”) for quantitative withdrawal.

  Patent Document 1 discloses a seat belt device in which a shoulder webbing and a lap webbing are separated, the shoulder webbing is pulled out from a shoulder webbing retractor with a force limiter mechanism, and the lap webbing is pulled out from a lap webbing with a force limiter mechanism. Have been described. This seat belt device has a pretensioner that draws a predetermined amount of lap webbing in the event of a vehicle emergency.

JP-A-2005-239051

  In the seat belt device of Patent Document 1, when the load applied to the shoulder webbing exceeds a specified value in a vehicle emergency, the shoulder webbing is unwound from the shoulder webbing retractor. In this case, the tension of the shoulder webbing on the upper side of the shoulder webbing, that is, the shoulder webbing on the slip joint side is reduced, but the tension of the shoulder webbing is not so reduced on the lower side of the shoulder webbing, that is, on the tongue side.

  According to the present invention, in a seat belt device in which a shoulder webbing and a lap webbing are separated from each other, the length of the shoulder webbing on the tongue side is gradually increased when the load of the shoulder webbing exceeds a predetermined value in a vehicle emergency. It is an object of the present invention to provide a seat belt device capable of exhibiting an impact absorbing action (EA action) by increasing it and a tongue thereof.

  The tongue of one aspect of the present invention includes a tongue plate whose front end is inserted into a buckle, a shoulder webbing coupling portion for coupling a shoulder webbing to the tongue plate, and a wrap for coupling a lap webbing to the tongue plate A shoulder webbing connected to the shoulder webbing connecting part in a tongue having a webbing connecting part by plastic deformation when a force exceeding a predetermined level is applied to the shoulder webbing connected to the shoulder webbing connection part. It is characterized in that a plastically deformable member that allows the rearward pulling out is provided.

  In one aspect of the present invention, the tongue includes a shaft bar around which a front end side of a shoulder webbing is wound, and an end portion of the shaft bar is supported by the tongue plate via a plastic deformation member, and the plastic deformation member Is a torsion bar that plastically deforms and rotates the shaft rod when the rotational force applied to the shaft rod from the shoulder webbing exceeds a predetermined value.

  In one aspect of the present invention, side walls are respectively provided upright from both side portions on the rear side of the tongue plate, one end side of the torsion bar is fixed to the side wall, and the other end side is the shaft rod. It is fixed to the end face.

  In one aspect of the present invention, the other end side of the torsion bar is an engaging portion having a non-circular cross-sectional shape, and a recess into which the engaging portion is fitted is provided on the end surface of the shaft rod. Yes.

  In one aspect of the present invention, a first sidewall is erected from one side portion on the rear side of the tongue plate, a second sidewall is erected from the other side portion, and the shaft rod is cylindrical. The rear end portion of the shaft rod is rotatably supported by the first sidewall, the front end side is rotatably supported by the second sidewall, and the torsion bar is inserted into the shaft rod. The rear end side of the torsion bar is supported so as not to rotate with respect to the first sidewall, and the front end side of the torsion bar is connected to the front end side of the shaft rod.

  In one aspect of the present invention, the distal end side of the torsion bar and the distal end side of the shaft rod are connected via a coupling body, and the distal end side of the torsion bar and the shaft rod rotate with respect to the coupling body, respectively. Linked impossible.

  In one aspect of the present invention, the tip end side of the torsion bar and the connecting body are connected via serrations.

  In one aspect of the present invention, the connecting body has a disk shape, and a key portion is provided on one of an outer peripheral edge of the connecting body and a tip end side of the shaft rod, and a key groove is provided on the other side. And the keyway are engaged.

  In one aspect of the present invention, the shoulder webbing connecting portion is supported by the tongue plate via the plastic deformation member, and the plastic deformation member has a force greater than or equal to a predetermined amount behind the shoulder webbing connection portion. Is plastically deformed to allow rearward movement of the shoulder webbing connecting portion.

  In one aspect of the present invention, sidewalls are erected on both side portions of the rear portion of the tongue plate, and a shaft bar as the shoulder webbing connecting portion is disposed between the sidewalls. The end is held on each sidewall via a plastically deformable member.

  In one aspect of the present invention, the plastic deformation member is an EA rod having one end connected to the shaft rod and the other end extending along the inward surface of the sidewall, and the other end side of the EA rod Is held by a holder provided on the inward surface of the sidewall, and the holder has a hole extending in the front-rear direction of the tongue plate, and the other end of the EA rod is in the hole. The EA rod has a curved portion that connects the front portion on the other end side held by the holder and the one end side.

  In one aspect of the present invention, the plastically deformable member is an EA plate extending in the front-rear direction of the tongue plate along the inward surface of the sidewall, and the EA plate is a curved portion in the middle of the extending direction. And a slide block that is movable to the rear of the tongue plate along the inward side wall on the opposite side of the shaft rod across the EA plate. The slide block is slidably in contact with the EA plate, and a concave portion with which the curved portion is engaged is provided on the surface of the slide block on the EA plate side.

  In one aspect of the present invention, a main guide hole extending in the front-rear direction of the tongue plate is provided on the base end side in the standing direction of the sidewall, and the end portion of the shaft rod is inserted into the main guide hole. The side wall is provided with a sub guide hole parallel to the main guide hole on the front end side in the standing direction, and the slide block has a main body facing the inward surface of the side wall, A plurality of pins protruding from the main body and inserted into the main guide hole and the sub guide hole, respectively.

  In one aspect of the present invention, in the rear part of the tongue plate, the first and second pins are erected from both the one surface and the other surface of the tongue plate in the width direction of the tongue plate, respectively. An EA rod as a plastic deformation member is wound around the first and second pins by a plurality of turns, and the tip side of the EA rod extends rearward from the tongue plate, and the shaft serving as the shoulder webbing connecting portion A rod is arranged behind the tongue plate in a direction parallel to the width direction of the tongue plate, one end side of the shaft rod is supported by the tip of the EA rod on one surface side of the tongue plate, and the other end side of the shaft rod is It is supported by the tip of the EA rod on the other surface side of the tongue plate.

  A seat belt device according to an aspect of the present invention includes the above-described tongue, a shoulder webbing connected to the shoulder webbing connection portion of the tongue, a shoulder webbing retractor for winding the shoulder webbing, and the tongue. And a lap webbing retractor for winding up the lap webbing.

  A seat belt device according to an aspect of the present invention includes a tongue having a shoulder webbing connection part and a lap webbing connection part, a shoulder webbing having a front end connected to the shoulder webbing connection part of the tongue, and winding the shoulder webbing A shoulder belt apparatus comprising: a shoulder webbing retractor for wrapping; a lap webbing having a leading end connected to the lap webbing connection portion of the tongue; and a lap webbing retractor for winding the lap webbing. The webbing has a stacking portion folded in a zigzag shape in the tongue, and a braking application portion is provided for applying braking to the drawer of the shoulder webbing from the stacking portion in the event of a vehicle emergency. To do.

  In one aspect of the seat belt device of the present invention, the tongue has a tongue plate, a latch hole is provided on the front end side of the tongue plate, and the first slot extends from the middle in the front-rear direction to the rear portion of the tongue plate. A second slot and a third slot are provided, and each of the first to third slots extends in a direction orthogonal to the front-rear direction of the tongue plate, and the front end side of the shoulder webbing is the first slot. The stack portion is connected to the slot, and the stack portion is provided following the portion connected to the first slot, and the stack portion is disposed along one surface of the tongue plate. The portion following the heavy portion wraps around the trailing edge of the tongue plate, the third slot is drawn from the other surface side of the tongue plate to the one surface side, and the second slot is further passed on the one surface. To the other side of the tongue plate, and further to the rear of the tongue plate along the other surface of the tongue plate, and a third slot on the other surface of the tongue plate and the trailing edge of the tongue plate, The shoulder webbing is overlapped with each other, and the braking is given by friction between the overlapped shoulder webbings and between the shoulder webbing and the tongue plate.

  In one aspect of the seat belt device of the present invention, the tongue has a tongue plate and a lock plate that can slide in the longitudinal direction of the tongue plate along the tongue plate, and a latch hole is provided on the front end side of the tongue plate. A first slot is provided at a rear portion of the tongue plate, and a second slot is provided in front of the first slot, and each of the first and second slots extends in a direction perpendicular to the front-rear direction of the tongue plate. The tong plate is provided with a locking portion made of a ridge rising on one first surface side of the tong plate along the rear edge of the second slot. A first plate that slidably overlaps the first surface, a second plate that slidably overlaps the other second surface of the tongue plate, and the first plate And a pair of extending portions extending from both sides of the first plate toward the rear of the tongue plate. The locking portion is disposed between the extending portions, the rear edge of the first plate is a locking surface, and a third slot is provided between the locking surface and the locking portion. The front edge of the second plate is located between the front edge and the rear edge of the second slot when the vehicle is not in an emergency, and the front end side of the shoulder webbing is passed through the first slot. The shoulder webbing is connected to the front end side of the shoulder webbing as the stacking portion, and the stacking portion is disposed along the first surface of the tong plate. , The portion following the stacking portion is the third slot and 2 slots are passed through the second surface side of the tongue plate, and further pulled out to the rear of the tongue plate along the second surface, and the braking application portion is constituted by the lock surface and the lock portion, In the event of a vehicle emergency, the shoulder webbing pushes the second plate of the lock plate rearward to move the lock plate rearward, and the shoulder webbing is sandwiched between the lock part and the lock surface to apply braking.

  A seat belt device according to an aspect of the present invention includes a tongue having a shoulder webbing connection part and a lap webbing connection part, a shoulder webbing having a front end connected to the shoulder webbing connection part of the tongue, and winding the shoulder webbing A shoulder belt apparatus comprising: a shoulder webbing retractor for wrapping; a lap webbing having a leading end connected to the lap webbing connection portion of the tongue; and a lap webbing retractor for winding the lap webbing. The webbing has a stacking portion that is overlapped by being folded at least twice in the vicinity of the tongue, and the shoulder webbing that overlaps the stacking portion is loaded when a load of a predetermined value or more is applied to the shoulder webbing. As a coupling means to release weight Characterized in that it is coupled me.

  In one aspect of the invention, the coupling means is a tear seam.

  In the seat belt device of the present invention, when the load on the shoulder webbing exceeds a predetermined value in the event of a vehicle emergency, the shoulder webbing is gradually pulled out from the tongue by being subjected to plastic deformation of the plastic deformation member and braking from the brake applying portion. Alternatively, the suture thread of the shoulder webbing is torn near the tongue, and the length of the shoulder webbing gradually increases. An impact absorption (EA) action is achieved by plastic deformation and braking of the plastic deformation member, or tearing of the suture thread.

It is a perspective view of a car front seat provided with a seatbelt device concerning a 1st embodiment. It is a perspective view of the tongue plate of the seatbelt apparatus of FIG. It is the III-III sectional view taken on the line of FIG. It is the IV-IV sectional view taken on the line of FIG. It is a perspective view of a torsion bar. It is a perspective view of the tongue plate of the seatbelt apparatus which concerns on 2nd Embodiment. It is the VII-VII sectional view taken on the line of FIG. FIG. 7 is a perspective view of the tongue of FIG. 6 with shoulder webbing. It is a perspective view of the tongue plate of the seatbelt apparatus which concerns on 3rd Embodiment. It is a perspective view from the back side of the tongue plate of FIG. (A) is a plan view of the tongue of FIGS. 9 and 10, (B) is a cross-sectional view taken along line BB of (A), and (C) is a cross-sectional view taken along line CC of (A). (A) is the sectional view on the aa line of FIG. 11, (b) is the sectional view on the bb line of FIG. 11, (c) is the sectional view on the cc line of FIG. (A)-(c) is a perspective view of an EA plate. It is a perspective view which shows the engagement relationship of a housing, a bending plate, and a rod. It is a perspective view of the tongue plate which concerns on 3rd Embodiment which connected webbing. It is the XVI-XVI sectional view taken on the line of FIG. It is a perspective view of the tongue plate of the seatbelt apparatus which concerns on 4th Embodiment. It is a top view of the tongue plate of FIG. It is the XIX-XIX sectional view taken on the line of FIG. It is a XX-XX arrow line view of FIG. It is a XXI-XXI arrow line view of FIG. It is a top view of the tongue which concerns on 5th Embodiment. It is the XXIII-XXIII sectional view taken on the line of FIG. It is a perspective view of the tongue plate of FIG. It is a perspective view from the passenger | crew side of the tongue plate of FIG. It is a perspective view which shows the structure of the tongue plate of the seatbelt apparatus which concerns on 6th Embodiment. (A) is a cross-sectional view taken along line XXVII-XXVII in FIG. 26, (B) and (C) are cross-sectional views when the webbing is connected, (D) is a cross-sectional view taken along the line DD in (A), and (E) is It is EE sectional view taken on the line of (A). It is a perspective view of the tongue plate of the seatbelt apparatus which concerns on 6th Embodiment. It is a perspective view of the vicinity of the tongue of the seat belt device concerning a 7th embodiment. It is a perspective view of the vicinity of the tongue of the seat belt device concerning another embodiment. It is a XXXI arrow line view of FIG. It is a XXXII arrow line view of FIG. It is XXXIII-XXXIII sectional drawing of FIG. It is XXXIV-XXXIV sectional drawing of FIG. It is a disassembled perspective view of a torsion bar and a shaft bar.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a front seat of an automobile equipped with a seat belt device of the present invention. The seat belt device 1 includes a shoulder webbing 2 and a lap webbing 3 which are separate members. The shoulder webbing 2 and the lap webbing 3 are pulled out from the retractors 4 and 5 each having an emergency lock mechanism, and the leading ends of the shoulder webbing 2 and the lap webbing 3 are connected to the tongue 6.

  The shoulder webbing 2 is drawn through the through anchor 7 and is drawn along the upper body of an occupant (not shown) sitting on the seat S. The illustrated seat S is a left side seat of an automobile, and the shoulder webbing retractor 4 and the lap webbing retractor 5 are both arranged on the left side of the seat S.

  Alternatively, the wrap webbing retractor 5 may be disposed below the seat S, and the lap webbing 3 may be guided to the lower side of the seat S via a through ring (not shown). A buckle 8 is installed on the right side of the seat S, and a tong 6 can be mounted.

  In this embodiment, the lap webbing retractor 5 includes a pretensioner.

  The shoulder webbing retractor 4 includes a pretensioner and a load limiter.

  The tongue 6 includes a load limiter mechanism that pulls the shoulder webbing 2 from the tongue 6 a predetermined length when the load applied to the shoulder webbing 2 exceeds a predetermined value. The tongue 6 is not provided with a load limiter mechanism for the lap webbing 3.

  The load limiter mechanism for the shoulder webbing 2 provided on the tongue 6 will be described with reference to FIGS.

  2 is a perspective view showing the tongue plate 10 of the tongue 6, and FIG. 3 shows a cross-sectional view taken along the line III-III of FIG. 2 in a state where the shoulder webbing 2 and the lap webbing 3 are connected to the tongue plate 10. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 in a state where the shoulder webbing 2 and the lap webbing 3 are not connected.

  The base plate 11 of the tongue plate 10 includes a latch hole 12 provided on the front end side of the base plate 11, that is, a side inserted into the buckle 8, and two parallel slots (long holes) provided on the rear end side of the base plate 11. 13 and 14. A pair of side walls 15, 15 are erected in the same direction from both sides on the rear end side of the base plate 11.

  Metal torsion bars 16 and 16 are provided on the side walls 15 and 15, and a shaft rod 17 around which the shoulder webbing 2 is wound is provided between the torsion bars 16 and 16.

  The base plate 11 and the side walls 15 and 15 are integrally made of steel. The slots 13 and 14 and the shaft rod 17 extend in the direction connecting the sidewalls 15 and 15. The shaft rod 17 is provided with a non-circular (hexagonal in this embodiment) concave hole 17a on both end faces thereof. The shaft rod 17 is provided with a slit 18 penetrating in the diameter direction.

  As shown in FIG. 5, the torsion bar 16 includes non-circular (hexagonal in this embodiment) engaging portions 16a and 16b provided on both ends, and a columnar portion 16c that connects the engaging portions 16a and 16b. have.

  The sidewall 15 is provided with an opening 15a through which the cylindrical portion 16c is inserted. A fixed seat 19 for fixing the engaging portion 16b is fixed to the outward surfaces of the sidewalls 15 and 15. An engaging portion 16b is fitted in a hexagonal hole 19a provided in the fixed seat 19. When the other engaging portion 16 a of the torsion bar 16 is fitted into the recessed hole 17 a of the shaft rod 17, the shaft rod 17 is installed between the sidewalls 15 and 15.

  The front end portion of the shoulder webbing 2 is inserted into the slit 18 of the shaft rod 17. A rod 2 </ b> L (FIG. 3) is attached to the tip of the shoulder webbing 2 so that the shoulder webbing 2 is not extracted from the slit 18.

  The shoulder webbing 2 is wound around the shaft rod 17 and then pulled out behind the tongue 6. The rear side of the tongue plate 11 is surrounded by a synthetic resin cover case 6a (FIG. 1).

  The distal end side of the lap webbing 3 is inserted into the slots 13 and 14 of the base plate 11, and then folded back and overlaid on the lap webbing 3, and is sewn with a suture thread 3a (FIG. 3).

  The rear side of the tongue plate 10 is encapsulated with a synthetic resin cover 6a (FIG. 1) to form the tongue 6.

  In the seat belt device 1 having the tongs 6 configured as described above, when the occupant sitting on the seat S attaches the tongs 6 to the buckle 8, the shoulder webbing 2 is routed along the upper body of the occupant. Then, the lap webbing 3 is routed along the occupant's waist.

  When a vehicle emergency such as a collision is predicted, the pretensioners of the retractors 4 and 5 are actuated to apply pretension to the webbings 2 and 3. When the load applied to the shoulder webbing 2 due to a vehicle collision or the like exceeds a predetermined value, the cylindrical portion 16c of the torsion bar 16 is plastically deformed so as to be twisted, and the shaft rod 17 rotates in the direction of arrow A in FIG. Is pulled out in the direction of arrow B.

  Due to the plastic deformation of the torsion bar 16, an EA (impact absorption) action is exerted. In this embodiment, since the shoulder webbing 2 is pulled out from the tongue 6, an EA action is exerted in the shoulder webbing 2 in the vicinity of the tongue 6.

  2 to 5, both ends of the shaft rod 17 are supported by the sidewall 15 via the torsion bar 16, but only one end side of the shaft rod is supported by one sidewall via the torsion bar. The other end of the rod may be rotatably supported on the other sidewall.

  The tongue 106 having such a configuration will be described with reference to FIGS.

  FIG. 30 is a perspective view showing the tongue 106, and FIGS. 31 to 34 show the configuration of the tongue plate 110 with the shoulder webbing 2 and the lap webbing 3 removed. FIG. 35 is an exploded perspective view showing a connection structure between the torsion bar 116 and the shaft rod 117. 31 is a view taken in the direction of arrow XXXI in FIG. 30, and FIG. 32 is a view taken in the direction of arrow XXXII in FIG. 33 and 34 are sectional views taken along lines XXXIII-XXXIII and XXXIV-XXXIV in FIG. 32, respectively.

  A latch hole 112 that is inserted into the buckle 8 is provided on the front end side of the base plate 111 of the tongue plate 110. A first sidewall 115A and a second sidewall 115B are erected in the same direction from both sides on the rear end side of the base plate 111. The base plate 111 and the side walls 115A and 115B are integrally made of steel. A rod 114 is installed between the front end portions of the sidewalls 115A and 115B. The front end side of the wrap webbing 3 is hooked on the rod 114, overlapped, and sewn with the suture thread 3a (FIG. 30), thereby being connected to the tongue plate 110.

  A metal torsion bar 116 and a shaft rod 117 are provided between the sidewalls 115A and 115B. The torsion bar 116 and the shaft rod 117 are arranged behind the rod 114.

  The shaft rod 117 is cylindrical, and the torsion bar 116 is inserted into the shaft rod 117. Openings 115a and 115b are provided in the sidewalls 115A and 115B, respectively, and both ends of the shaft rod 117 are fitted into the openings 115a and 115b, respectively. The shaft rod 117 is fitted to the openings 115a and 115b so as to be rotatable around its axis.

  A fixed seat 119 is fixed coaxially with the opening 115a on the outward surface of the sidewall 115A. A non-circular concave hole 119a such as a hexagon is provided on the surface of the fixed seat 119 on the side wall 115A.

  The rear end side (the left end side in FIG. 34) of the torsion bar 116 is an engaging portion 116a fitted in the non-circular concave hole 119. By engaging the engaging portion 116a with the recessed hole 119A, the rear end side of the torsion bar 116 is fixedly supported by the sidewall 115A through the fixing seat 119 so as not to rotate.

  An engagement portion 116b having a serration is provided on the tip side (the right end side in FIG. 34) of the torsion bar 116. The engaging portion 116 b is fitted in the serration hole 121 of the connecting body 120. As clearly shown in FIG. 35, the connecting body 120 has a substantially disk shape having the serration hole 121 at the center. A plurality of key grooves 122 are provided on the outer peripheral edge of the connecting body 120 at regular intervals in the circumferential direction.

  On the distal end side of the shaft rod 117, a plurality of convex tooth-shaped key portions 117a engaged with the key groove 122 are provided at regular intervals in the circumferential direction. The key portion 117a protrudes in a direction parallel to the axial center line of the shaft rod 117.

  The engaging portion 116 b having the serration of the torsion bar 116 engages with the serration hole 121 of the connecting body 120, and the key groove 122 of the connecting body 120 and the key portion 117 a of the shaft rod 117 engage with each other. The distal end side and the distal end side of the shaft rod 117 are firmly connected. Thereby, the torque applied to the shaft rod 117 is reliably transmitted to the torsion bar 116 via the connecting body 120. In this embodiment, the shaft rod 117 and the connecting body 120 have the same outer diameter, and a part of the outer peripheral surface of the connecting body 120 also enters the opening 115b of the sidewall 115B.

  The shaft rod 117 has two slits 118 extending in a direction parallel to the axial line. The shoulder webbing 2 is inserted into the slits 118, 118, folded back, and sewn, thereby being connected to the shaft rod 117.

  The shoulder webbing 2 is wound around the shaft rod 117 and then pulled out behind the tongue 106.

  The rear side of the tongue plate 110 is encapsulated with a synthetic resin cover (similar to the cover case 6a in FIG. 1; not shown in FIGS. 30 to 35) to form the tongue 106.

  Even in the seat belt device including the tongue 106 configured as described above, when the occupant sitting on the seat S attaches the tong 106 to the buckle 8 (FIG. 1), the shoulder webbing 2 extends along the upper body of the occupant. The lap webbing 3 is drawn along the occupant's waist.

  When a vehicle emergency such as a collision is predicted, the pretensioners of the retractors 4 and 5 are actuated to apply pretension to the webbings 2 and 3. When the load applied to the shoulder webbing 2 due to a vehicle collision or the like exceeds a predetermined value, the torsion bar 116 is plastically deformed to be twisted, the shaft rod 117 rotates in the direction of arrow A in FIG. 30, and the shoulder webbing 2 moves in the direction of arrow B. Pulled out.

  Due to the plastic deformation of the torsion bar 116, an EA (impact absorption) action is exerted. In this embodiment, since the shoulder webbing 2 is pulled out from the tongue 106, the EA action is exerted in the shoulder webbing 2 in the vicinity of the tongue 106.

  30 to 35, the shaft rod 117 is provided with a key portion, and the connecting body 20 is provided with a key groove. However, the connecting body 120 is provided with a key portion, and the shaft rod 117 is provided with a key groove. Also good.

  FIGS. 6-8 shows the tongue plate 20 of the tongue of the seatbelt apparatus which concerns on 2nd Embodiment.

  A latch hole 21 a is provided on the front end side of the base plate 21 of the tongue plate 20, and two parallel slots (long holes) 23 and 24 are provided on the rear end side. A pair of sidewalls 25, 25 are erected in the same direction from both sides on the rear end side of the base plate 21.

  Each side wall 25, 25 is provided with a guide hole 26 extending in the front-rear direction of the tongue plate 20, and an end portion of a shaft rod 27 for hanging the shoulder webbing 2 is inserted into the guide hole 26. Yes. The shaft rod 27 is constructed between the sidewalls 25 and 25.

  A slide block 28 extending along the inward surface of the sidewall 25 is fixed to both ends of the shaft rod 27. One end portion 29a of a plastically deformable metal EA rod 29 curved in a J-shape is connected and fixed to the slide block 28 so as not to be removed.

  A rod holder 22 extending in the front-rear direction of the tongue plate 20 is provided on the inward surfaces of the sidewalls 25, that is, the surfaces facing each other. The rod holder 22 is provided with a hole 22a extending in the front-rear direction of the tongue plate 20, and a linear other end 29b of the EA rod 29 is slidably inserted into the hole 22a. The EA rod 29 is a curved portion 29c that is curved in a semicircular arc shape between the one end portion 29a and the other end portion 29b.

  The slide block 28 is slidably disposed between the rod holder 22 and the base plate 21.

  As shown in FIG. 8, the shoulder webbing 2 is connected to the tongue plate 20 by hooking the tip end side of the shoulder webbing 2 around the shaft rod 27 and folding it back, and stitching the overlapped portion with the suture thread 2 a.

  The slots 23 and 24 of the base plate 21 extend in the direction connecting the sidewalls 25 and 25. Although not shown, as in FIG. 3, one end of the lap webbing 3 is inserted into the slots 23 and 24, and the overlapping portion is stitched by the suture thread 3a, so that the lap webbing 3 is connected to the tongue plate 20. Is done.

  The second half of the tongue plate 20 is encapsulated with a synthetic resin cover to form a tongue.

  In the seat belt device having the tongue having the tongue plate 20, when the load of the shoulder webbing 2 exceeds a predetermined value due to a vehicle collision or the like, the slide block 28 pulls the EA rod 29 strongly, and the EA rod 29 The other end 29b is gradually pulled out from the hole 22a of the rod holder 22 while being plastically deformed. Due to the plastic deformation of the EA rod 29, an EA (impact absorption) action is exhibited. In this embodiment, in the event of a vehicle emergency, the shaft rod 27 gradually moves to the rear of the tongue, and the shoulder webbing 2 is gradually pulled out of the tongue, so that the EA action is exerted on the shoulder webbing 2 in the vicinity of the tongue.

  9 to 16 show a tongue plate 30 of a seat belt device according to a third embodiment.

  A latch hole 32 is provided on the front end side of the base plate 31 of the tongue plate 30, and two parallel slots (long holes) 33 and 34 are provided on the rear end side. A pair of side walls 35, 35 are erected in the same direction from both sides on the rear end side of the base plate 31.

  A main guide hole 36 extending in the front-rear direction of the tongue plate 30 is provided on the base end side in the standing direction of the sidewalls 35, that is, on the base plate 31 side. A sub guide hole 37 parallel to 36 is provided.

  End portions 38e of shaft rods 38 for hooking the shoulder webbing 2 are inserted into the main guide holes 36, 36, respectively.

  A metal EA plate 40 parallel to the base plate 31 is disposed along the edge of the main guide hole 36 on the side of the base plate 31 on the opposing surface, that is, the inward surface of the sidewalls 35, 35. The EA plate 40 is in the form of a strip that is arranged with one side in the longitudinal direction in contact with the sidewall 35. As shown in FIG. 13A, a semicircular curved portion 40a is provided in the middle of the EA plate 40 in the longitudinal direction. A shaft bar 38 is engaged with the curved portion 40a.

  On one end side in the longitudinal direction of the EA plate 40, an overhanging portion 40b that projects in a direction orthogonal to the longitudinal direction is provided. The EA plate 40 is held by the sidewall 35 by engaging the protruding portion 40b with a notch 35a provided on the front end side of the sidewall 35, that is, the side portion on the latch hole 32 side.

  The EA plate 40 protrudes in a direction in which the curved portion 40a is separated from the base plate 31, and the shaft bar 38 engages with the curved portion 40a from the base plate 31 side (FIG. 14).

  As shown in FIG. 14, the slide block 42 is disposed on the side opposite to the base plate 31 of the EA plate 40, that is, on the front end side of the side wall 35 in the standing direction with respect to the EA plate 40. The slide block 42 includes a main body 43 slidably disposed along an inward surface of the sidewall 35, and guide pins 44 and 45 projecting from a side surface of the main body 43, that is, a sliding surface with the sidewall 35. And have. Two guide pins 44 and 45 are provided. The guide pin 44 is inserted into the sub guide hole 37, and the guide pin 45 is inserted into the main guide hole 36. The shaft bar 38 is located between the guide pins 45.

  The slide block 42 is movable along the guide holes 37 and 36 by engaging the guide pins 44 and 45 with the guide holes 37 and 36.

  The bottom surface of the main body 43, that is, the facing surface 43b facing the base plate 31, is provided with a semicircular recess 43a engaged with the curved portion 40a.

  The curved portion 40a of the EA plate 40 is sandwiched between the shaft bar 38 and the concave portion 43a. A bottom surface 43 b of the main body 43 is slidably in contact with the EA plate 40.

  As shown in FIGS. 15 and 16, the front end side of the lap webbing 3 is inserted into the slots 33 and 34 of the base plate 31, folded back, and sewn with the suture thread 3 a, whereby the lap webbing 3 is connected to the base plate 31.

  The front end side of the shoulder webbing 2 is hooked and folded with respect to the shaft bar 38, inserted into the slot 34, folded along the rear edge of the base plate 31, overlapped with the shoulder webbing 2, and sewn with the suture thread 2 a. The shoulder webbing 2 is locked to the shaft bar 38.

  The second half of the tongue plate 30 is encapsulated with a synthetic resin cover to form a tongue.

  In the seat belt device having the tongue having the tongue plate 30, when the load on the shoulder webbing 2 exceeds a predetermined value due to a vehicle collision or the like, the shaft bar 38 is strongly pulled by the shoulder webbing 2 and the tongue plate 30. Gradually move toward the rear (direction B). The shaft bar 38 presses the main body 43 of the slide block 42 rearward via the EA plate 40, and the slide block 42 also moves rearward integrally with the shaft bar 38. Since the curved portion 40a of the EA plate 40 is sandwiched between the curved portion 43a of the main body 43 and the shaft rod 38, when the shaft rod 38 and the slide block 42 are moved rearward, FIGS. 13B and 13C. As described above, the bending portion 40a moves backward.

  That is, as shown in FIG. 13B, in the initial state, the bending portion 40a is positioned near the middle in the longitudinal direction of the EA plate 40, but the shaft rod 38 and the slide block 42 are moved backward. Along with this, the EA plate rear portion 40r, which has been flat, is plastically deformed so as to bend along the shaft rod 38 and the recess 43a. Further, the portion that has been the curved portion 40 a until then is plastically deformed so as to extend in a flat plate shape along the bottom surface 43 b of the slide block main body 43.

  Thus, the EA plate 40 is plastically deformed as the shaft bar 38 moves backward. Due to the plastic deformation of the EA plate 40, an EA action (impact absorbing action) is achieved. In this embodiment, the shaft bar 38 moves to the rear of the tongue in the event of a vehicle emergency, and the shoulder webbing 2 is gradually pulled out of the tongue, so that the EA action is exerted by the shoulder webbing 2 in the vicinity of the tongue.

  17 to 21 show a tongue 50 constituting a seat belt device according to a fourth embodiment.

  A latch hole 52 is provided on the front end side of the tongue plate 51 of the tongue 50, and two slots (long holes) 53, 54 extend in the width direction of the tongue plate 51, that is, in the direction orthogonal to the front-rear direction. It is installed.

  Pins 55, 56, 57, 58 that stand vertically from the plate surface of the tongue plate 51 are provided at the rear of the tongue plate 51.

  The pins 55 and 56 are erected from one surface of the tongue plate 51, and the pins 57 and 58 are erected from the other surface of the tongue plate 51. The pins 55 and 57 are located on one end side in the width direction of the tongue plate 51, and the pins 56 and 58 are located on the other end side in the width direction of the tongue plate 51.

  Sub-pins 59 and 60 are erected in the vicinity of the pins 56 and 57 and in front of the pins 56 and 57.

  An EA rod 61 made of a metal rod is hung between the pins 55 and 56, and an EA rod 62 is hung between the pins 57 and 58. The EA rod 61 is looped around in an eight shape so as to cross between the pins 55 and 56. The EA rod 62 is wound in an eight-shape so as to cross between the pins 57 and 58.

  The EA rod 61 is wound around the pins 55 and 56 by a plurality of turns (two turns in this embodiment), and then one end side 61 c extends from the pin 55 to the rear of the tongue plate 51. The EA rod 62 is wound around a plurality of turns (two turns in this embodiment) between the pins 57 and 58, and then one end side 62 c extends from the pin 58 to the rear of the tongue plate 51.

  The distal end portions of the one end sides 61c and 62c of the EA rods 61 and 62 are bent in directions close to each other to form shaft rod holding portions 61a and 62a (FIG. 18).

  The shaft rod 63 is held on the tongue plate 51 via the EA rods 61 and 62 by inserting the shaft rod holding portions 61 a and 62 a into both ends of the shaft rod 63. The shaft bar 63 extends in a direction parallel to the width direction of the tongue plate 51.

  The EA rod 61 is passed between the pin 56 and the sub pin 59, and the EA rod 62 is passed between the pin 57 and the sub pin 60. The distance between the pin 56 and the sub-pin 59 and the distance between the pin 57 and the sub-pin 60 are substantially equal to the rod diameter of the EA rods 61 and 62. The other ends of the EA rods 61 and 62 are folded portions 61 b and 62 b that are folded back 180 ° toward the front side of the tongue plate 51. The folded portions 61b and 62b cannot pass between the pin 56 and the sub-pin 59, and between the pin 57 and the sub-pin 60.

  The shoulder webbing 2 is coupled to the shaft bar 63 by hooking the tip end portion of the shoulder webbing 2 on the shaft bar 63, folded back and superimposed, and sutured by the suture thread 2 a.

  The lap webbing 3 is drawn through the slots 53, 54, folded back and overlapped, and stitched by the suture thread 3a, whereby the lap webbing 3 is connected to the tongue plate 51.

  The tongue half of the tongue plate 51 is encapsulated with a synthetic resin cover (not shown in FIGS. 17 to 21) to form a tongue 50.

  In the seat belt device provided with the tongs 50, when the load on the shoulder webbing 2 exceeds a predetermined value due to a vehicle collision or the like, the shaft rod 63 is strongly pulled by the shoulder webbing 2, thereby causing the EA rods 61 and 62 to be pulled. Is pulled out from the tongue plate 51 while being plastically deformed, and the shaft 63 moves rearward B from the tongue plate 51. An EA action (impact absorbing action) is achieved by plastic deformation of the EA rods 61 and 62. In this embodiment, since the shaft bar 63 moves to the rear of the tongue 50 and the shoulder webbing 2 is pulled out from the tongue 50, the EA action is exerted by the shoulder webbing 2 near the tongue.

  With reference to FIGS. 22-25, the tongue 70 which comprises the seatbelt apparatus which concerns on 5th Embodiment is demonstrated.

  The tongue plate 71 of the tongue 70 has a latch hole 72 on the front end side and three slots (long holes) 73 to 75 on the rear side. The slots 73 to 75 extend in the width direction of the tongue plate 71 (direction orthogonal to the front-rear direction). The third slot 75 is located on the rearmost side of the tongue plate 71, the second slot 74 is located on the front side, and the first slot 73 is further located on the front side. The first slot 73 is located near the middle of the tongue plate 71 in the front-rear direction.

  A pair of side walls 76, 76 are erected in the same direction from both sides on the rear side of the tongue plate 71. A shaft rod 77 is installed between the side walls 76. The lap webbing 3 is coupled to the tongue plate 71 by hooking the tip end side of the lap webbing 3 on the shaft rod 77, being folded, overlaid, and stitched with the suture thread 3a.

  The shoulder webbing 2 is drawn into the second slot 74 from the side opposite to the standing direction of the sidewall 76 (hereinafter referred to as the front side) to the standing direction side of the sidewall 76 (hereinafter referred to as the back side). Next, the third slot 75 is drawn from the back side to the front side, then the last side of the tongue plate 71 is turned from the front side to the back side, and the product is folded back and folded multiple times in the rear side of the second slot 74 of the tongue plate 71. After configuring the overlapping portion 2S, the second slot 74 is drawn from the back side to the front side, and the first slot 73 is drawn from the front side to the back side.

  The front end side of the shoulder webbing 2 and the subsequent portion are overlapped on the back side of the tongue plate 71 and are connected to the tongue plate 71 by sewing with the suture thread 2a.

  Note that the front end side of the shoulder webbing 2 may be pulled through the first slot 73 from the back side to the front side, then passed through the second slot 74 from the front side to the back side, and stitched with the suture thread 2a.

  On the rear side of the third slot 75, the shoulder webbing 2 overlaps on the front side of the tongue plate 71. That is, the shoulder webbing 2 (2e) from the second slot 74 toward the retractor overlaps with the shoulder webbing 2 (2d) that wraps around the rearmost side of the tongue plate 71 from the third slot 75. Hereinafter, the portion of the shoulder webbing 2 in contact with the tongue plate 71 in the overlapping portion is referred to as a shoulder webbing lower layer 2d, and the shoulder webbing overlapping the shoulder webbing lower layer 2d may be referred to as a shoulder webbing upper layer 2e.

  When the occupant is wearing the tongue 70 on the buckle, the shoulder webbing 2 is drawn to the lap webbing 3 side rather than the rearward extension direction on the front side of the tongue plate 71. Therefore, the shoulder webbing upper layer 2 e presses the shoulder webbing lower layer 2 d against the tongue plate 71 due to the tension of the shoulder webbing 2.

  The tongue half of the tongue plate 71 is encapsulated by a synthetic resin cover (not shown in FIGS. 22 to 25) to form a tongue 70.

  The stacked portion 2S of the shoulder webbing 2 is disposed in the cover.

  In the seat belt device provided with the tongue 70, the shoulder webbing 2 is pulled out from the tongue 70 when the load on the shoulder webbing 2 exceeds a predetermined value due to a vehicle collision or the like.

  In this case, due to the tension generated in the shoulder webbing 2, the shoulder webbing upper layer 2e strongly presses the shoulder webbing lower layer 2d against the tongue plate 71, so that a strong frictional force is generated between the shoulder webbing upper layer 2e, the shoulder webbing lower layer 2d and the tongue plate 71. The shoulder webbing 2 is braked by this frictional force and gradually pulled out. This friction braking force provides an EA action. At this time, the shape retention of the stacked portion 2S is released, and the shoulder webbing 2 is pulled out from the stacked portion 2S toward the third slot 75. In this embodiment, when the shoulder webbing 2 is pulled out from the tongue 70, the shoulder webbing 2 in the vicinity of the tongue 70 exhibits an EA action.

  With reference to FIGS. 26-28, the tongue 80 which comprises the seatbelt apparatus which concerns on 6th Embodiment is demonstrated. FIGS. 27B, 27C, and 28 show a state where the shoulder webbing is connected to the tongue.

  The tongue plate 81 of the tongue 80 has a latch hole 82 on the front end side and four slots (long holes) 83 to 86 on the rear side. The slots 83 to 86 extend in the width direction of the tongue plate 81 (a direction orthogonal to the front-rear direction). The slots 83 and 84 connect the lap webbing 2 and are located on the front side of the slots 85 and 86. The first slot 86 is for connecting the shoulder webbing 2 and is located on the rearmost side of the tongue plate 81, and the second slot 85 is located between the slot 84 and the first slot 86.

  The wrap webbing 3 is connected to the tongue plate 81 by passing the leading end side of the lap webbing 3 through the slots 83 and 84, folding them back, overlapping, and stitching with the suture thread 3a.

  As shown in FIG. 27 (B), the lap webbing 3 is passed through the slot 83 from the second surface 81f on the occupant side of the tongue plate 81 to the first surface 81r on the opposite side. The first surface 81r side passes through the second surface 81f side. However, the lap webbing 3 may be passed through the slot 84 and the slot 83 in this order.

  The second surface 81f is a surface that faces the passenger when the passenger wears the tongue 80 on the buckle.

  A lock plate 87 is provided so as to surround the vicinity of the second slot 85 of the tongue plate 81. The lock plate 87 includes a first plate 87a that slidably overlaps the first surface 81r of the tongue plate 81, a second plate 87b that slidably overlaps the second surface 81f, and the first and second plates. A pair of side portions 87c for connecting the side portions of 87a and 87b, respectively, and a pair of extending portions 87d extending from both sides of the first plate 87a toward the rear of the tongue plate 81; It is a flat rectangular tube. The extending part 87d and the second plate 87b are connected by the side part 87c. The rear edge between the extended portions 87d and 87d of the first plate 87a is a lock surface 87e.

  From the rear edge of the second slot 85 of the tongue plate 81, there is provided a lock portion 81e made of a ridge that rises toward the first surface 81r. In this embodiment, the front edge of the lock portion 81e is flush with the rear edge of the second slot 85, but it may protrude forward from the rear edge of the second slot 85.

  The lock part 81 e extends in the width direction of the tongue plate 81. The length of the locking portion 81e in the extending direction is equal to or slightly smaller than the distance between the extending portions 87d and 87d, and the locking portion 81e is between the extending portions 87d and 87d. positioned. When the vehicle is not in an emergency, the third slot 88 is provided between the lock portion 81e and the lock surface 87e.

  When the vehicle is not in an emergency, the front edge of the second plate 87 b of the lock plate 87 is located between the front edge and the rear edge of the second slot 85. In addition, when the vehicle is not in an emergency, the lock surface 87e is located behind the front edge of the second slot 85. The length of the second plate 87b projecting forward from the rear edge of the second slot 85 when the vehicle is not in emergency is the front-rear width of the third slot 88 when the vehicle is not in emergency (that is, the front of the lock surface 87e and the lock portion 81e). Equal to or greater than the distance).

  As shown in FIG. 27B, the front end side of the shoulder webbing 2 passes from the second surface 81 f side of the tongue plate 81 to the second slot 85 and the third slot 88 through the front of the second plate 87 b of the lock plate 87. Further, the first slot 86 is folded back from the first surface 81r side to the second surface 81f side. The leading edge portion of the shoulder webbing 2 and the subsequent portion are overlapped with each other and stitched by the suture thread 2 a, whereby the shoulder webbing 2 is connected to the rearmost portion of the tongue plate 81.

  The shoulder webbing 2 is folded back multiple times in the vicinity of the stitched portion by the suture thread 2a to form a stacked portion 2S.

  Even if tension is applied to the shoulder webbing 2 when the occupant wears the seat belt, the shape retention of the stacked portion 2S is maintained, and the shoulder webbing 2 is not pulled out from the tongue 80.

  The retractor side of the shoulder webbing 2 from the second slot 85 extends around the front edge of the second plate 87 b and extends behind the tongue plate 81.

  The rear half of the tongue plate 81 is encapsulated with a synthetic resin cover (not shown in FIGS. 26 to 28) to form a tongue 80.

  In the seat belt device provided with the tongue 80, when the load on the shoulder webbing 2 exceeds a predetermined value due to a vehicle collision or the like, the shoulder webbing 2 is located behind the tongue 80 (in the direction of arrow B in FIG. 27C). Is slightly pulled out of the tongue 80. At this time, the shoulder webbing 2 comes into contact with the front edge of the second plate 87b of the lock plate 87 and pulls the lock plate 87 backward (B direction).

  Accordingly, the shoulder webbing 2 is strongly sandwiched between the lock surface 87e and the lock portion 81e, and a strong frictional force is generated between the shoulder webbing 2, the lock surface 87e, and the lock portion 81e. The shoulder webbing 2 is braked by this frictional force and gradually pulled out from the tongue 80. This friction braking force provides an EA action. At this time, the shoulder webbing 2 is pulled out from the stacked portion 2S toward the third slot 88. In this embodiment, when the shoulder webbing 2 is pulled out from the tongue 80, the shoulder webbing 2 near the tongue 80 exerts an EA action.

  With reference to FIG. 29, the tongue 90 which comprises the seatbelt apparatus based on 7th Embodiment is demonstrated.

  The tongue 90 includes a tongue plate 91 and a synthetic resin cover 92 that encloses the rear portion of the tongue plate 91. The shoulder webbing 2 and the lap webbing 3 are connected to the tongue plate 91, respectively.

  In the vicinity of the tongue 90, the shoulder webbing 2 is folded back twice (or four or six times) to form a three-layer (or five or seven-layer) laminated portion 2T. In the laminated portion 2T, the folded shoulder webbings 2, 2, and 2 are stitched together by tear seams 2f. The stacked portion 2T may be disposed in the cover 92 of the tongue 90. The tear seam 2f has a strength that does not tear due to the tension generated when the occupant wears the seat belt.

  In the seat belt device provided with the tongue 90, when the load applied to the shoulder webbing 2 exceeds a predetermined value due to a vehicle collision or the like, the tear seam 2f is gradually broken, and the length of the shoulder webbing 2 is increased. The EA action is produced by the tear seam 2f gradually breaking. In addition, the shoulder webbing 2 near the tongue 90 has an EA effect.

  The above-described embodiment is an example of the present invention, and the present invention may be configured other than illustrated.

DESCRIPTION OF SYMBOLS 1 Seat belt apparatus 2 Shoulder webbing 2S Stacking part 3 Lap webbing 4,5 Retractor 6 Tongue 8 Buckle 10 Tongue plate 11 Base plate 16 Torsion bar 17 Shaft bar 20 Tongue plate 21 Base plate 22 Rod holder 26 Guide hole 27 Shaft bar 28 Slide block 29 EA rod 30 tong plate 31 base plate 36 main guide hole 37 sub guide hole 38 shaft rod 40 EA plate 40a curved portion 42 slide block 50 tong 51 tong plate 55 to 58 pin 59, 60 sub-pin 61, 62 EA rod 63 shaft rod 70 Tongue 71 tongue plate 77 shaft rod 80 tongue 81 tongue plate 81e lock part 87 lock plate 87e lock surface 90 tongue 91 tongue plate DOO 106 tongue 110 tongue plate 115A, 115B sidewall 116 torsion bar 117 pintle 120 connecting body

Claims (20)

A tong plate whose front end is inserted into the buckle;
A shoulder webbing connecting portion for connecting a shoulder webbing to the tongue plate;
In the tongue having a lap webbing connecting portion for connecting the lap webbing to the tongue plate,
Plasticity that allows the shoulder webbing connected to the shoulder webbing connection part to be pulled out backward by plastic deformation when a force exceeding a predetermined value is applied to the shoulder webbing connected to the shoulder webbing connection part. A tongue comprising a deformable member. In Claim 1, the said tongue is provided with the axis rod by which the front end side of a shoulder webbing is wound,
The end of the shaft rod is supported by the tongue plate via a plastic deformation member,
The tong characterized in that the plastically deformable member is a torsion bar that plastically deforms and rotates the shaft rod when the rotational force applied to the shaft rod from the shoulder webbing exceeds a predetermined value. In claim 2, sidewalls are respectively provided upright from both side portions on the rear side of the tongue plate,
Both ends of the shaft rod are supported by the sidewalls via the torsion bars,
One end of the torsion bar is fixed to the sidewall, and the other end is fixed to an end of the shaft bar. In claim 3, the other end side of the torsion bar is a non-circular cross-sectional engagement portion,
A tong characterized in that a concave portion into which the engaging portion is fitted is provided on an end surface of the shaft rod. In claim 2, the first sidewall is erected from one side portion of the rear side of the tongue plate, the second sidewall is erected from the other side portion,
The shaft rod is cylindrical, the rear end portion of the shaft rod is rotatably supported on the first sidewall, and the tip end side is rotatably supported on the second sidewall,
The torsion bar is inserted inside the shaft rod,
The rear end side of the torsion bar is supported so as not to rotate with respect to the first sidewall,
A tong characterized in that the tip side of the torsion bar is connected to the tip side of the shaft bar. In Claim 5, the tip side of the torsion bar and the tip side of the shaft bar are connected via a connecting body,
The tongs characterized in that the tip sides of the torsion bar and the shaft rod are non-rotatably connected to the connecting body.   7. The tongue according to claim 6, wherein the tip side of the torsion bar and the connecting body are connected via serrations. In Claim 6 or 7, the connecting body is disk-shaped,
A tong characterized in that a key portion is provided on one of the outer peripheral edge of the coupling body and the tip end side of the shaft rod, a key groove is provided on the other, and the key portion and the key groove are engaged with each other. . In Claim 1, the shoulder webbing connecting portion is supported by the tongue plate via the plastic deformation member,
The tongs characterized in that the plastic deformation member is plastically deformed when a predetermined force or more is applied to the shoulder webbing connecting portion to the rear of the tongue, and allows the shoulder webbing connecting portion to move rearward. In claim 9, side walls are respectively erected on both side portions of the rear portion of the tongue plate,
A shaft bar as the shoulder webbing connecting portion is disposed between the sidewalls,
A tong characterized in that the end of the shaft rod is held by each side wall through a plastic deformation member. The plastic deformation member according to claim 10, wherein the plastic deformation member is an EA rod having one end connected to the shaft rod and the other end extending along an inward surface of the sidewall.
The other end side of the EA rod is held by a holder provided on the inward surface of the sidewall,
The holder has a hole extending in the front-rear direction of the tongue plate, and the other end side of the EA rod is disposed in the hole.
The EA rod has a curved portion that connects a front portion on the other end side held by the holder and the one end side. In Claim 10, the plastic deformation member is an EA plate extending in the front-rear direction of the tongue plate along the inward surface of the sidewall,
The EA plate has a curved portion in the middle of the extending direction, and the shaft rod is engaged with the curved portion,
On the opposite side of the shaft rod across the EA plate, a slide block is installed that can move to the rear of the tongue plate along the inward side wall of the sidewall.
The slide block is slidably in contact with the EA plate,
A tongue having a concave portion engaged with the curved portion is provided on a surface of the slide block on the EA plate side. In claim 12, a main guide hole extending in the front-rear direction of the tongue plate is provided on the base end side in the standing direction of the sidewall,
The end of the shaft rod is inserted into the main guide hole,
A sub guide hole parallel to the main guide hole is provided at the front end side of the side wall in the standing direction,
The slide block has a main body that faces the inward surface of the sidewall, and a tongue that protrudes from the main body and that is inserted into the main guide hole and the sub guide hole. . In claim 9, in the rear part of the tongue plate, the first and second pins are erected from both the one surface and the other surface of the tongue plate in the width direction of the tongue plate, respectively.
As the plastic deformation member, an EA rod is wound around the first and second pins for a plurality of turns,
The tip side of the EA rod extends rearward from the tongue plate,
A shaft bar as the shoulder webbing connecting portion is arranged in a direction parallel to the tongue plate width direction behind the tongue plate,
One end of the shaft rod is supported by the tip of the EA rod on one side of the tongue plate,
The tongue is characterized in that the other end side of the shaft rod is supported by the tip portion of the EA rod on the other surface side of the tongue plate. Tongs according to any one of claims 1 to 14,
A shoulder webbing whose tip side is coupled to the shoulder webbing coupling part of the tongue;
A retractor for shoulder webbing for winding the shoulder webbing;
A lap webbing whose tip side is connected to the lap webbing connection part of the tongue;
A seat belt device comprising: a lap webbing retractor for winding the lap webbing. A tongue having a shoulder webbing connection part and a lap webbing connection part;
A shoulder webbing whose tip side is coupled to the shoulder webbing coupling part of the tongue;
A retractor for shoulder webbing for winding the shoulder webbing;
A lap webbing whose tip side is connected to the lap webbing connection part of the tongue;
In a seat belt device comprising a lap webbing retractor for winding up the lap webbing,
The shoulder webbing has a stacking portion in the tongue.
A seat belt device comprising a braking applying portion for applying braking to a drawer of the shoulder webbing from the stacking portion in a vehicle emergency. In Claim 16, the tongue has a tongue plate,
A latch hole is provided on the front end side of the tongue plate,
A first slot, a second slot, and a third slot are provided from the middle to the rear of the tongue plate in the front-rear direction, and each of the first to third slots extends in a direction orthogonal to the front-rear direction of the tongue plate. And
The front end side of the shoulder webbing is connected to the first slot,
The stacking portion is provided subsequent to the portion connected to the first slot,
The stacking part is disposed along one surface of the tongue plate,
The portion following the stacking portion wraps around the trailing edge of the tongue plate, the third slot is drawn from the other surface side of the tongue plate to the one surface side, and the second slot is further extended from the one surface side. Led to the other surface side, and further pulled out to the rear of the tongue plate along the other surface of the tongue plate,
Shoulder webbing overlaps between the third slot on the other side of the tongue plate and the trailing edge of the tongue plate,
The seat belt device according to claim 1, wherein the braking is given by friction between the shoulder webbing overlapping each other and between the shoulder webbing and the tongue plate. In claim 16, the tongue has a tongue plate and a lock plate slidable in the longitudinal direction of the tongue plate along the tongue plate,
A latch hole is provided on the front end side of the tongue plate,
A first slot is provided at the rear of the tongue plate, and a second slot is provided in front of the first slot. Each of the first and second slots extends in a direction perpendicular to the longitudinal direction of the tongue plate. And
The tongue plate is provided with a lock portion formed of a ridge rising on one first surface side of the tongue plate along the rear edge of the second slot,
The lock plate includes a first plate that slidably overlaps the first surface of the tongue plate;
A second plate slidably overlying the other second surface of the tongue plate;
A pair of side portions respectively connecting both side portions of the first plate and the second plate;
A pair of extending portions extending from both sides of the first plate toward the rear of the tongue plate,
The locking portion is disposed between the extending portions,
The rear edge of the first plate is a locking surface;
There is a third slot between the lock surface and the lock part,
The leading edge of the second plate is located between the leading edge and the trailing edge of the second slot in a vehicle non-emergency,
The front end side of the shoulder webbing is connected to the tongue plate through the first slot,
In the shoulder webbing, the portion continuing to the tip side is the stacked portion, and the stacked portion is disposed along the first surface of the tongue plate,
The portion following the stacking portion is passed through the third slot and the second slot to the second surface side of the tongue plate, and further pulled out to the rear of the tongue plate along the second surface,
The braking application portion is configured by the lock surface and the lock portion,
In a vehicle emergency, the shoulder webbing pushes the second plate of the lock plate backward to move the lock plate rearward, and the shoulder webbing is sandwiched between the lock part and the lock surface to apply braking. Seat belt device. A tongue having a shoulder webbing connection part and a lap webbing connection part;
A shoulder webbing whose tip side is coupled to the shoulder webbing coupling part of the tongue;
A retractor for shoulder webbing for winding the shoulder webbing;
A lap webbing whose tip side is connected to the lap webbing connection part of the tongue;
In a seat belt device comprising a lap webbing retractor for winding up the lap webbing,
The shoulder webbing has a stacking portion that is overlapped by being folded at least twice in the vicinity of the tongue.
The seat belt device, wherein the shoulder webbing overlapped at the stacking part is coupled by coupling means for releasing the stack when a load of a predetermined value or more is applied to the shoulder webbing.   20. The seat belt device according to claim 19, wherein the coupling means is a tear seam.

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