JP2016064715A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat which achieves webbing inversion prevention and non-adhesiveness at a high level and enables improvement of webbing taking-up capability.SOLUTION: A webbing passage 20 has: a first passage 24 in which a webbing 23 in a seat back 14 is disposed in a vertical direction; and a second passage 26 intersecting with the first passage 24 and having one end extending to an opening part 46. The webbing passage 20 includes a turning part 39 which is provided between the first passage 24 and the second passage 26 and turns a travel direction of the webbing 23. A webbing inversion prevention passing port 38 is provided at the turning part 39. The webbing inversion prevention passing port 38 has a slit part 38a through which the webbing 23 penetrates.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle seat.

  Conventionally, a vehicle seat in which a seat belt device is provided in a seat back has been proposed. In such a vehicle seat, the webbing of the seatbelt device passes through the webbing passage portion of the bezel provided on the upper surface on the one corner at the top of the seatback, and goes straight down along the front surface of the seatback. It extends. Further, the front end side of the webbing is fixed to a skeleton member of a vehicle seat or a vehicle body through a gap between the seat back and a seat cushion. In the webbing, a tongue is provided at a portion between the upper end portion and the lower end portion of the seat back. The tongue can be attached to a buckle provided on the seat cushion on the opposite side of the width direction of the seat back portion located proximal to the tip side portion of the webbing (Patent Document) 1).

  In Patent Document 2, the webbing, one end of which is held by a seat belt retractor, is passed through the inside of the seat back, and the opening is provided in the upper part of the seat back (described as a drawer port (66) in Patent Document 2). A vehicle seat in which a webbing is pulled out to the front side of a seat back has been proposed.

  Further, a webbing guide having a slit part (described as an opening part (73) in Patent Document 2) through which the webbing is slidably passed is provided on the inner side of the seat back than the opening part. A gap through which the webbing passes in the slit portion is formed narrower than the opening.

  In Patent Document 2, the opening has a wide vertical width. Further, the slit portion is provided below the opening portion, and a webbing inversion prevention passage port for bending a webbing is formed between the opening portion and the slit portion (in Patent Document 2, a webbing bending guide portion (105)). Description) is provided. In Patent Document 2, when the webbing that restrains the occupant is released and the webbing is twisted, the twisted webbing is twisted by the slit part when the twisted webbing passes through the opening and the webbing inversion prevention passage port. Is trying to eliminate.

  In Patent Document 3, a seat belt retractor is provided in a garnish that covers a pillar of a vehicle body. A webbing having one end coupled to the seat belt retractor so as to be able to be drawn and wound is slidably inserted into a shoulder belt anchor provided in the garnish. Further, the other end of the webbing is disposed from the shoulder belt anchor through a webbing passage part (described as an opening part in Patent Document 3) of a bezel provided in the garnish, and is disposed in the vehicle interior. It is fixed to the lower end.

  A tongue is slidably provided at a portion of the webbing disposed in the vehicle interior. The tongue is bound to a floor surface of a vehicle body or a buckle fixed to the seat, thereby restraining an occupant sitting on the seat. In Patent Document 3, the vertical width of the webbing passage portion of the bezel is wider than that in Patent Document 1.

JP2012-218687A Japanese Patent No. 47197783 JP 2004-330992 A

  By the way, conventionally, when the webbing is taken up, inversion winding may occur in the webbing passage portion of the bezel. The reverse winding is a phenomenon in which the webbing is clogged in the folded state at the webbing passage portion of the bezel when the webbing is wound.

  When the webbing that has passed through the bezel in the reverse winding state is wound around the seat belt retractor, the seat belt retractor is broken. Therefore, in order to avoid this inversion, it has been proposed to narrow the width of the webbing passage portion of the bezel.

  However, when the width of the webbing passage portion is narrowed, when the webbing is pulled out toward the end portion in the longitudinal direction of the webbing passage portion, the webbing may stick to the end portion and become stuck. If the webbing sticks to the bezel and the webbing cannot be taken out in this manner, the structure of the bezel itself may be destroyed if it is further pulled. Therefore, in order to avoid such a phenomenon, Patent Document 1 employs a laughing mouth-shaped configuration in which both ends of the webbing passage portion 102 of the bezel 100 are folded back as shown in FIG. This laughing mouth shape can alleviate the pulling direction in which the webbing adheres, but even if such a configuration is adopted, this phenomenon cannot be completely avoided. FIG. 19 shows a case where the webbing 104 is fixed to both ends of the webbing passage portion 102 of the bezel 100. 18 and 19 are plan views of the bezel 100. In FIG. 18, the lower side is the front and the upper side is the rear.

  Further, the method of simply reducing the width of the webbing passage portion increases the friction with respect to the webbing, and hinders the webbing take-up and withdrawal. In addition, when the frictional resistance at the time of winding the webbing is large, the spring force to wind up the seat belt retractor is increased accordingly. In this case, the feeling of wearing pressure on the occupant during use increases. There's a problem.

  In Patent Document 2, when the webbing is pulled by the seat belt retractor in a twisted state, the twisted portion passes through the opening provided at the upper part of the seat back and the webbing inversion prevention passage port, and then becomes a narrow slit. Twist is eliminated at the part. However, the slit portion has a narrowed width in the front-rear direction (short direction perpendicular to the longitudinal direction). For this reason, the friction with respect to the webbing is large, which causes the winding performance of the webbing to deteriorate.

  In Patent Document 3, when the webbing tongue is released, when the webbing end of the webbing is turned upside down, the reversal takes place in the slit portion passing through the webbing of the shoulder belt anchor. The entrainment state is canceled.

  However, in Patent Document 3, in the slit portion, the width in the short direction perpendicular to the longitudinal direction is narrowed. For this reason, the friction with respect to the webbing is large, which causes the winding performance of the webbing to deteriorate.

  An object of the present invention is to provide a vehicle seat that can achieve both high-level prevention of webbing reversal and non-sticking, and improve webbing winding performance.

  In order to solve the above problems, the vehicle seat of the present invention is provided so that the webbing that is passed through the inside of the seat back can be pulled out through an opening of a cover provided in the upper portion of the seat back. In the vehicle seat having a webbing passage, the webbing passage includes a first passage in which the webbing in the seat back is arranged in a vertical direction, a second passage that intersects the first passage and has one end extending to the opening. A direction changing portion provided between the first passage and the second passage for changing a traveling direction of the webbing, and a webbing inversion prevention passage port provided in the direction changing portion. The inversion prevention passage port has a slit portion through which the webbing penetrates.

Moreover, it is preferable that the slit portion of the webbing inversion prevention passage port is provided in a portion where the direction changing portion and the first passage are connected.
Moreover, it is preferable that the webbing reversal prevention passage port and the opening of the cover are separated by 10 mm or more within a range regulated by the cover.

  Further, the opening of the cover is formed in a long hole so as to extend in a direction intersecting the thickness direction of the first passage and the webbing, and both end portions in the longitudinal direction are formed in a semicircular shape. It is preferable.

  The seat back or a seat cushion that supports the seat back is provided with a seat belt retractor that allows the webbing to be wound and pulled out, and the slit portion of the webbing inversion prevention passage port is a vehicle width. The length in the short direction perpendicular to the longitudinal direction of the slit portion is 1.3 to 2.2 times the thickness of the webbing. It is preferable to do.

  According to the present invention, it is possible to achieve both high-level prevention of webbing inversion and non-adhesion, and to improve the webbing winding performance.

Explanatory drawing which shows the use condition of the vehicle seat of 1st Embodiment. The principal part sectional view in a seat back. The assembly perspective view of a cover and a webbing guide member. The perspective view seen from the upper surface side of the cover. The perspective view of a webbing guide member. The perspective view of the webbing guide member seen from the direction different from FIG. The perspective view seen from the bottom face side of a cover. Sectional drawing cut | disconnected by the 8-8 line | wire of FIG. 7 in the assembly state of a cover and a webbing guide member. Sectional drawing cut | disconnected by the 9-9 line | wire of FIG. 7 in the assembly state of a cover and a webbing guide member. 7A is a cross-sectional view taken along line 10 (a) -10 (a) in FIG. 7 in an assembled state of the cover and the webbing guide member, and FIG. 7B is a sectional view of FIG. Sectional drawing cut | disconnected by the (b) -10 (b) line. The cross-sectional view of the assembly state of a cover and a webbing guide member. Explanatory drawing of an effect | action of a cover and a webbing guide member. Explanatory drawing of an effect | action of a cover and a webbing guide member. Explanatory drawing of the opening part of a cover. The principal part perspective view of the vehicle seat of 2nd Embodiment. The principal part sectional view in a seat back. The disassembled perspective view of the bezel, cover, and webbing guide member of 2nd Embodiment. Explanatory drawing of the bezel of a prior art example. Explanatory drawing of the bezel of a prior art example.

  Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to FIGS. In addition, the UP, FR, and OUT arrows shown in FIGS. 1 to 13 indicate the upper side in the vertical direction, the front side in the front-rear direction, and the outer side in the width direction, respectively.

As shown in FIG. 1, the vehicle seat 12 includes a seat cushion 13 and a seat back 14 provided at the rear end of the seat cushion 13.
As shown in FIG. 2, the seat back 14 includes a seat back frame 15, a front cushion material 16 and a rear cushion material 17 that are disposed on the front and back of the seat back frame 15 and supported by the seat back frame 15.

  As shown in FIG. 2, a webbing passage 20 is provided inside the seat back 14. As shown in FIG. 2, the webbing passage 20 includes a webbing guide member 30 fixed to the seat back frame 15 and a cover 40 disposed above the webbing guide member 30 and fixed to the webbing guide member 30. The first passage 24, the second passage 26, and the direction changing portion 39 are configured to be included.

  The webbing guide member 30 is fixed to the seatback frame 15 by, for example, screwing, but the attachment of the webbing guide member 30 to the seatback frame 15 is not limited to these methods.

  As shown in FIG. 5, the webbing guide member 30 is formed in a substantially quadrangular frustum shape, and includes front walls 30a, rear walls 30b, side walls 30c, 30d connecting the ends of the front walls 30a and 30b, and It has a top wall 30e that connects the upper parts thereof.

As shown in FIGS. 5, 8, and 9, a locking step portion 31 protruding to the front of the vehicle is formed between the top wall 30 e and the front wall 30 a.
Further, between the top wall 30e and the rear wall 30b, a locking step 32 protruding to the rear of the vehicle is formed. As shown in FIGS. 5, 10, and 12, a locking step portion 33 protruding outward in the vehicle width direction is formed between the top wall 30 e and the side wall 30 d on the outer side in the vehicle width direction. As shown in FIGS. 6, 10A, 10B, and 12, on the inner side in the width direction of the vehicle, below the top wall 30e and above the side wall 30c on the inner side in the width direction of the vehicle. A locking step 34 is formed.

  As shown in FIGS. 2 to 4, the cover 40 is formed in a cap shape so as to cover the webbing guide member 30, and the front wall 40a, the rear wall 40b, and the end portions of the front wall 40a and the rear wall 40b are respectively formed. Side walls 40c and 40d to be connected, and a top wall 40e to connect the upper portions thereof. The cover 40 is also called a bezel.

  As shown in FIGS. 2, 8, and 9, the cover 40 is attached to the webbing guide member 30 with the upper end surface of the rear wall 30b as the contact surface 30f and in contact with the contact surface 30f. It is fixed.

  Specifically, as shown in FIG. 7, the inner surface of the front wall 40a of the cover 40 is provided with a pair of locking claws 41 on the outer side and the inner side in the width direction of the vehicle. As shown, the webbing guide member 30 is locked to the lower surface of the locking step portion 31.

  As shown in FIG. 7, a pair of locking claws 42 are provided on the inner surface of the rear wall 40b of the cover 40. As shown in FIGS. 8 and 9, the locking step 32 of the webbing guide member 30 is provided. It is latched by the lower surface of each. As shown in FIG. 7, a locking claw 43 is provided on the inner surface of the side wall 40d of the cover 40 and is locked to the lower surface of the locking step 33 of the webbing guide member 30 as shown in FIG. ing. Further, as shown in FIG. 7, an engagement claw 44 is provided on the inner surface of the side wall 40c of the cover 40, and as shown in FIG. 10 (a), it contacts the upper surface of the locking step 34 of the webbing guide member 30. Touching.

  As shown in FIG. 7, one or more protrusions 45 a, 45 b, 45 c extending in the vertical direction are provided on the inner surfaces of the side walls 40 c, 40 d and the inner surface of the rear wall 40 b of the cover 40. As shown in FIG. 11, the protrusion 45b is in contact with the side wall 30d, and is positioned when the cover 40 is assembled to the webbing guide member 30 and is prevented from rattling. Further, the protrusions 45 a and 45 c are reinforcing ribs of the cover 40.

  As shown in FIGS. 2 and 3, the front wall 40a of the cover 40 has an opening 46 that is linearly extended in the width direction of the vehicle and formed into a long hole, and a webbing 23 described later is drawn out. It has a size that can be wound. The opening 46 is formed with semicircular R portions 46 a at both ends in the extending direction, and the width in the vertical direction of the vehicle (hereinafter referred to as opening width) is 5.9 to the thickness of the webbing 23. 8.4 times longer. For example, when the thickness of the webbing 23 is 1.2 mm, the opening width is preferably 7.0 to 10 mm. If the opening width of the opening 46 is less than 5.9 times, it is difficult to restore the original flat state when the webbing is folded into a Z shape as shown in FIG. Further, if the opening width of the opening 46 exceeds 8.4 times, the inside of the cover 40 can be seen through the opening 46, and foreign matter easily enters the cover 40 through the opening 46, which is not preferable. The radius of curvature of the R portion 46a may be a value that can be derived from the opening width. For example, if the opening width is 7.0 to 10 mm, the radius of curvature of the R portion 46a may be a radius of 3.5 mm to 5.0.

As shown in FIGS. 3, 4 and 11, the lower center of the opening 46 is opened downward by a cutout groove 47 formed in the front wall 40a.
As shown in FIGS. 7 and 11, a pair of engaging claws 48 and 49 project inwardly on both side edges extending below the notch groove 47 on the back surface of the front wall 40 a. The claw portions 48a and 49a at the distal ends of the pair of engaging claws 48 and 49 are formed so as to be opposite to each other in the width direction of the vehicle. The front wall 30a of the webbing guide member 30 is provided with engaged protrusions 35 and 36 that engage with the claw portions 48a and 49a of the engagement claws 48 and 49, and the front end portions 35a and 36a are mutually connected. It is formed so as to face.

  As shown in FIG. 11, the engaging claws 48 and 49 of the cover 40 are inserted between the engaged protrusions 35 and 36 of the webbing guide member 30, and the claw parts 48 a and 49 a are engaged protrusions 35. , 36 are engaged with the tip portions 35a, 36a so as not to come out in the direction toward the front of the vehicle. Further, as shown in FIG. 11, on the front wall 30 a of the webbing guide member 30, a fitting protrusion 37 protrudes between the engaged protrusions 35 and 36, and is inserted into the notch groove 47 of the cover 40. Has been inserted. The tip of the fitting protrusion 37 is formed so as not to protrude forward from the front wall 40 a of the cover 40.

Next, the webbing passage 20 will be described.
As shown in FIGS. 2, 5, and 6, a webbing reversal prevention passage port (hereinafter simply referred to as a reversal prevention passage port) 38 is provided at a portion in front of the contact surface 30 f of the webbing guide member 30. A seat belt retractor 22 is provided below the inversion prevention passage port 38 as shown in FIG. The seat belt retractor 22 has a known configuration and can wind up and pull out the webbing 23. The first passage 24 is from the inversion prevention passage port 38 to the seat belt retractor 22, and the webbing 23 in the seat back 14 is arranged in the vertical direction.

  The inversion prevention passage port 38 is arranged so as to allow the webbing 23 to pass in a normal state between the opening 46 and is formed into a long hole extending linearly in the width direction of the vehicle. That is, the inversion prevention passage port 38 is formed in a long hole extending in a direction intersecting with the thickness direction of the webbing 23 of the seat belt retractor 22. Further, the inversion prevention passage port 38 is formed so that the front-rear width in the direction perpendicular to the width direction of the vehicle is gradually narrowed from the connection portion on the second passage 26 side to the connection portion on the first passage 24 side. Thus, the smallest portion of the front-rear width in the direction orthogonal to the vehicle width direction is defined as a slit portion 38a.

  The passage width of the slit portion 38 a of the inversion prevention passage port 38 (the front-rear width in the direction perpendicular to the vehicle width direction) is narrower than the opening width of the opening 46. The normal webbing 23 refers to a state in which the belt-like webbing 23 is not reversed or folded back into a Z-shape.

Further, the inversion prevention passage port 38 extends linearly, so that the frictional resistance of the webbing 23 when the webbing 23 passes through the inversion prevention passage port 38 is reduced.
The width of the slit portion 38 a of the anti-reversal passage port 38, that is, the length in the short direction perpendicular to the longitudinal direction of the anti-reversal passage port 38 is 1.3 to 2 of the thickness of the webbing 23. It is set to 2 times. In addition, the passage width of the slit portion 38a of the inversion prevention passage port 38 may be, for example, twice the thickness of the webbing 23 in the above range. The reason for setting the passage opening width of the slit portion 38a as described above is as follows.

  When the webbing 23 is wound around the seat belt retractor 22 and the direction of the webbing 23 is changed toward the inversion prevention passage port 38 by a direction changing portion 39 described later, the webbing 23 naturally swells and is about three times as thick as the thickness. It became clear by the test. For this reason, the width of the passage opening of the slit portion 38a of the inversion prevention passage opening 38 is set within the set range that is equal to or less than the expanded thickness. Thus, the friction between the inner surface of the slit part 38a and the webbing 23 is reduced by setting the passage opening width of the slit part 38a. If the slit portion 38a is less than 1.3 times the thickness of the webbing 23, the frictional force with the webbing 23 is not preferable. If the slit portion 38a exceeds 2.2 times the thickness of the webbing 23, the function of preventing the webbing 23 from being reversed by the slit portion 38a is lost when the webbing 23 is folded into a Z shape during winding.

  As shown in FIGS. 2, 8, and 9, the lower end of the slit portion 38a of the inversion preventing passage port 38 protrudes toward the direction changing portion 39 and has an edge. The edge is configured so that the webbing 23 to be rewound comes into line contact. The edge of the slit portion 38a and the webbing 23 are made by line contact so as to reduce the contact resistance.

  The separation distance between the inversion prevention passage port 38 and the opening 46 of the cover 40 is a distance at which the pulled webbing 23 is not fixed by the R portion 46a when the webbing 23 is pulled out in contact with the R portion 46a of the opening 46. Is set. The determination of the non-adhering distance is set according to the rigidity defined by the material, width, thickness, etc. of the webbing 23. As a result of various verifications by the inventors, the distance not fixed is preferably 10 mm or more within a range regulated by the cover 40.

  When the webbing 23 is pulled out, the shorter the distance between the anti-inversion passage port 38 and the opening 46, the higher the rigidity of the webbing 23 between the inversion-prevention passage port 38 and the opening 46 and the familiarity with the shape of the R portion 46a. The webbing 23 is easily fixed by the R portion 46a. On the other hand, when the webbing 23 is pulled out, if the separation distance between the inversion preventing passage port 38 and the opening 46 is the set distance, the webbing 23 between the inversion preventing passage port 38 and the opening 46 has low rigidity. Therefore, the webbing 23 is prevented from adhering to the R portion 46a.

  As shown in FIGS. 2, 8, and 9, a direction changing portion 39 is formed on the top surface of the front edge portion of the inversion prevention passage port 38 in the top wall 30 e. The direction changing portion 39 is a continuous curved surface, that is, sliding contact, from a portion connected to the top wall 30e to a portion protruding upward from the top wall 30e and a portion positioned below the edge of the slit portion 38a. Has a surface. The curved surface has, for example, a circular cross section.

  The second passage 26 has one end extending to the opening 46 and the other end extending to the inversion prevention passage port 38. And the direction change part 39 is arrange | positioned so that the 1st channel | path 24 and the 2nd channel | path 26 may be connected.

  As shown in FIG. 1, an end fitting 27 and a tongue plate 28 are inserted into the webbing 23 outside the seat back 14 that is taken out through the opening 46 of the cover 40.

(Operation of the first embodiment)
The operation of the vehicle seat 12 configured as described above will be described.
As shown in FIG. 2, the webbing 23 pulled out from the seat belt retractor 22 passes through the first passage 24 and the anti-reverse passage port 38, is changed in direction by the direction changing portion 39, and is then turned into the second passage 26 and the opening. It goes out of the vehicle seat 12 through the part 46.

  When the webbing 23 is pulled out, the webbing 23 swells about three times when the direction changing unit 39 changes the direction from the first passage 24 to the second passage 26. However, this bulge is mainly due to the bulging after the webbing 23 passes through the anti-reverse passage port 38 and the contact resistance with the inner surface on the direction changing portion 39 side. It will be smaller than that.

  Also, as shown in FIGS. 12 and 13, when the webbing 23 is pulled out in a state of being offset from the R portion 46a of the opening 46, the separation distance between the inversion prevention passage port 38 and the opening 46 is set to the R portion 46a. The webbing 23 is set at a distance that does not stick. For this reason, since the webbing 23 has low rigidity and conforms to the shape of the R part 46a, the webbing 23 is prevented from being fixed to the R part 46a.

  Further, when winding the webbing 23 around the seat belt retractor 22, the webbing 23 passes through the opening 46 and the second passage 26, and is redirected to the first passage 24 by the direction changing portion 39, and passes through the inside of the anti-reversing passage opening 38. pass. At this time, the thickness of the webbing 23 is increased about three times when the direction is changed by the direction changing portion 39. The swollen webbing 23 is squeezed and passed by the inversion preventing passage 38 having a passage opening width formed narrower than the swollen thickness, and is wound around the seat belt retractor 22 through the first passage 24. At the time of winding, the webbing 23 receives the frictional resistance with the slit portion 38a and the sliding contact surface with the direction changing portion 39 at the reversal prevention passage port 38, so that compared with the case where the webbing 23 is pulled out. Large frictional resistance.

  Further, even when the webbing 23 in the reverse winding state is wound, the webbing 23 is changed in direction to the first passage 24 by the direction changing portion 39 and passes through the inside of the reverse prevention passage port 38. At this time, the thickness of the webbing 23 is increased about three times when the direction is changed by the direction changing portion 39. However, since the webbing 23 is squeezed when the edge of the slit portion 38 a comes into contact with the anti-winding webbing 23 in the anti-reversal passage port 38, the webbing 23 is released from the reverse winding state and is moved to the first passage 24. Moving.

  Further, the webbing 23 in the reverse winding state has a higher frictional resistance than the case where the webbing 23 in the normal state that is not the reverse winding state is wound. However, in the present embodiment, the winding opening width of the webbing 23 can be improved because the passage opening width is made wider than before and the frictional resistance is reduced.

According to this embodiment, the following effects can be obtained.
(1) In the vehicle seat 12 of the present embodiment, the webbing passage 20 intersects the first passage 24 in which the webbing 23 in the seat back 14 is arranged in the vertical direction, the first passage 24 and one end is an opening 46. A second passage 26 extending to the end. The webbing passage 20 includes a direction changing portion 39 that is provided between the first passage 24 and the second passage 26 and changes the traveling direction of the webbing 23.

  Furthermore, the webbing inversion prevention passage port 38 has a slit portion 38a through which the webbing 23 passes. As a result, according to the present embodiment, it is possible to achieve both high-level prevention of webbing inversion and non-adhesion, and to improve the webbing winding performance.

  (2) In the present embodiment, the slit portion 38 a of the webbing inversion prevention passage port 38 is provided at a portion where the direction changing portion 39 and the first passage 24 are connected. As a result, according to the present embodiment, the effect (1) can be easily realized by the slit portion 38a provided in the portion where the direction changing portion 39 and the first passage 24 are connected.

  (3) In the vehicle seat 12 of the present embodiment, the inversion prevention passage port 38 and the opening 46 of the cover 40 are separated by 10 mm or more within a range regulated by the cover 40. As a result, when the webbing 23 is pulled out in a state of being offset from the R portion 46a, the webbing 23 has a reduced rigidity at that portion, and thus can contribute to prevention of the webbing 23 from being fixed to the R portion 46a.

  (4) In the present embodiment, the opening 46 of the cover 40 extends in the width direction of the vehicle and is formed into a long hole, and both end portions in the longitudinal direction have semicircular R portions 46a. As a result, according to the present embodiment, in the operation (2), the webbing 23 has low rigidity and conforms to the shape of the R part 46a, so that the webbing 23 is prevented from being fixed to the R part 46a. .

  (5) In the present embodiment, the seat belt retractor 22 that enables the webbing 23 to be wound and pulled out on the seat back 14 is disposed. Further, the inversion prevention passage port 38 is formed in a long hole extending linearly in the width direction of the vehicle, and the length in the short direction perpendicular to the longitudinal direction of the slit portion 38a is the thickness of the webbing. It was set to 1.3 to 2.2 times.

  As a result, according to the present embodiment, it is possible to reduce friction between the inner surface of the inversion preventing passage port 38 and the webbing 23. Thus, since the frictional resistance is reduced, the winding performance of the webbing 23 can be improved. Further, by reducing the friction, the force of the spring for causing the seat belt retractor 22 to wind up can be reduced, and the occupant's feeling of wearing pressure from the webbing 23 during use can be reduced.

  (6) Further, in this embodiment, when the webbing 23 is wound by the seat belt retractor 22, the webbing 23 that passes through the anti-reverse passage port 38 is in line contact with the edge of the slit portion 38a. Since the contact resistance can be reduced, the force of the spring that winds the seat belt retractor 22 can be reduced. That is, a feeling of wearing pressure from the webbing 23 in the occupant during use can be reduced.

  (7) In the present embodiment, the opening 46 of the cover 40, the structure for preventing reversal (the reversal prevention passage port 38), and the structure for improving non-sticking (particularly, the opening 46 and the reversal prevention passage port). 38). That is, the design of the cover 40, that is, the bezel, is not constrained by a configuration for preventing inversion and a configuration for enhancing non-adhesiveness. For this reason, the designability of the cover 40 (bezel) can be improved.

(Second Embodiment)
Next, the vehicle seat 12 of 2nd Embodiment is demonstrated with reference to FIGS. Note that, in the vehicle seat 12 of the second embodiment, the same or corresponding components as those of the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and different configurations will be described.

  In the present embodiment, as shown in FIG. 16, the vehicle seat 52 includes a seat cushion (not shown) and a seat back 54 supported by the seat cushion. The seat back 54 includes the same seat back frame 15 as in the first embodiment, and the seat back frame 15 includes a webbing guide member 30 and a cover 60 attached to the webbing guide member 30. As shown in FIG. 17, the webbing guide member 30 has the same configuration as the webbing guide member 30 of the first embodiment.

  As shown in FIGS. 16 and 17, the cover 60 is formed in a cap shape so as to cover the webbing guide member 30. Specifically, the cover 60 includes a front wall 60a, a rear wall 60b, side walls 60c and 60d that respectively connect the ends of the front wall 60a and the rear wall 60b, and a top wall 60e that connects the upper portions thereof. The cover 60 is also called a bezel.

  In order to attach and fix the cover 60 to the webbing guide member 30 in the same manner as in the first embodiment, the locking claws 42, 43, the engaging claws 44, the protrusions 45a, 45b, 45c, the engaging claws 48, 49 are provided. Although not shown in the figure, it is provided. In addition, an attachment portion 61 is attached to a lower portion of the front wall 60a of the cover 60 by a fastening member or the like attached to a frame (not shown) arranged in parallel with the seat back frame 15.

  As shown in FIGS. 16 and 17, the front wall 60 a is formed with a flat cylindrical portion 50 protruding forward, and an opening 46 is formed in the cylindrical portion 50, as in the first embodiment. Is different. The opening 46 is a long hole similarly to the first embodiment, and both ends in the longitudinal direction have R portions 46a. The separation distance between the opening 46 and the inversion prevention passage port 38 of the webbing guide member 30 is set to a distance at which the webbing 23 does not adhere to the R part 46a, as in the first embodiment.

  As shown in FIG. 17, in the front wall 60a, a pair of mounting holes 62 are formed in the upper and lower portions adjacent to the cylindrical portion 50. Further, in the cylindrical portion 50, a locking projection 64 projects from the inner surface of the mounting hole 62.

  A design bezel 66 is attached to the attachment hole 62. The design bezel 66 includes a ring-shaped frame portion 67 and an attachment tube portion 68 protruding rearward from the back surface (rear surface) of the frame portion 67. A cylindrical hole 69 of the mounting cylinder portion 68 is fitted around the cylindrical portion 50, and a protruding piece 70 protruding from the mounting cylinder portion 68 is inserted into the mounting hole 62.

  As shown in FIGS. 16 and 17, the design bezel 66 is extracted from the cylindrical portion 50 by engaging the locking projections 64 with the locking holes 71 pierced in the mounting cylindrical portion 68. It is impossible to assemble.

  As described above, by arranging the webbing guide member 30, the cover 60, and the design bezel 66, as shown in FIG. 16, the webbing passage is provided below the inversion prevention passage port 38 as in the first embodiment. Twenty first passages 24 are arranged. Further, the second passage 26 is disposed between the opening 46 and the inversion prevention passage port 38. Furthermore, the inversion prevention passage port 38 provided in the edge part of the 2nd channel | path 26 connected to the direction change part 39 similarly to 1st Embodiment is arrange | positioned.

  As shown in FIG. 16, a cushion pad 80 and a skin layer 82 that covers the cushion pad 80 are disposed so as to cover the cover 60, the seat back frame 15, and the like. The skin layer 82 includes a sponge material 83 and a skin material 84 laminated so as to cover the sponge material 83. Although the skin material 84 is not limited, For example, it consists of a fabric. As shown in FIG. 16, the skin material 84 is folded back into the mounting hole 62 at the portion where the design bezel 66 is disposed, and a removal preventing member 85 is sewn into the folded end portion. . As shown in FIG. 16, the removal prevention member 85 engages with the tip of the protruding piece 70 to prevent the skin material 84 from coming off from the mounting hole 62.

  As shown in FIG. 16, the peripheral portion of the design bezel 66 is disposed in contact with a step portion 82 a provided on the skin layer 82. In addition, the surface (front surface) of the design bezel 66 is arranged so as to be flush with the surface (front surface) of the skin material 84. In FIG. 16, an elastic resin member 87 made of urethane or the like is disposed so as to surround the periphery of the cylindrical portion 50 of the cover 60, and is interposed between the skin layer 82 and the front wall 60a. Thus, the stability of the shape of the skin layer 82 on the back surface side is maintained. Further, the cover 60 serves as a structural bezel so as to hold the shape of the seat back 14, particularly the upper shape.

According to this embodiment, the following effects can be obtained.
(1) In the present embodiment, the design bezel 66 is directly attached and fixed to the cover 60 as a structural bezel. As a result, it becomes possible to make the shape close to the design design having a sense of unity with the surface of the skin layer 82 of the seat back 14.

For example, even a sheet design having a curved surface can have a shape with a sense of unity with the surface. Further, the design bezel can have a design shape with a high degree of freedom.
In addition, the design bezel conventionally has a seat belt function (for example, various functions such as a webbing guide function) when the seat belt is operated.

  However, in this embodiment, since the function is given to the cover 60 which is a structural bezel instead of the design bezel 66, the design bezel is highly designed without being affected by the seat belt function. can do.

  (2) In the present embodiment, the surface (front surface) of the design bezel 66 is disposed so as to be flush with the surface (front surface) of the skin material 84. For this reason, according to this embodiment, it can have a sense of unity with the surface of the skin layer 82 of the seat back 14.

In addition, you may change this embodiment as follows.
In the above embodiment, the seat belt retractor 22 is built in the seat back, but the seat belt retractor 22 may be disposed on the seat cushion 13 that supports the seat back 14.

The shape of the cover 40 is a substantially square frustum, but is not limited to this shape, and may be other shapes such as a bowl shape.
-Although the cross-sectional circular surface was used as the curved surface of the cross-sectional shape of the direction change part 39, it is not limited to this shape, For example, an elliptical shape may be sufficient.

12 ... Vehicle seat, 13 ... Seat cushion, 14 ... Seat back,
15 ... Seat back frame, 16 ... Front cushion material,
17 ... rear cushion material, 20 ... webbing passage,
22 ... Seat belt retractor, 23 ... Webbing,
24 ... 1st passage, 26 ... 2nd passage, 27 ... End metal fittings,
28 ... tongue plate, 30 ... webbing guide member,
30a ... Front wall, 30b ... Rear wall, 30c, 30d ... Side wall, 30e ... Top wall,
30f ... abutting surface, 31, 32, 33, 34 ... locking step,
35, 36 ... engaged protrusions, 35a, 36a ... tip parts,
37 ... fitting protrusion, 38 ... webbing inversion prevention passage port, 38a ... slit part,
39 ... Direction change part, 40 ... Cover, 40a ... Front wall, 40b ... Rear wall,
40c, 40d ... side wall, 40e ... top wall, 41, 42, 43 ... locking claw,
44 ... engaging claw, 45a, 45b, 45c ... ridge, 46 ... opening,
46a ... R part, 47 ... notch groove, 48, 49 ... engaging claw,
48a, 49a ... claw part, 50 ... cylindrical part, 52 ... vehicle seat,
54 ... Seat back, 60 ... Cover, 61 ... Mounting part, 62 ... Mounting hole,
64 ... locking projection, 66 ... design bezel, 67 ... frame portion, 68 ... mounting tube portion,
69 ... Cylinder hole, 70 ... Projection piece, 71 ... Locking hole 71
80 ... Cushion pad, 82 ... Skin layer, 83 ... Sponge material,
84: skin material, 85 ... omission prevention member.

Claims (5)

In a vehicle seat having a webbing passage provided so as to be able to pull out the webbing that is passed through the inside of the seat back through an opening of a cover provided in the upper part of the seat back,
The webbing passage is
A first passage for arranging the webbing in the seat back in the vertical direction;
A second passage that intersects the first passage and has one end extending to the opening;
A direction changing portion provided between the first passage and the second passage to change the traveling direction of the webbing;
A webbing inversion prevention passage port provided in the direction changing portion,
The webbing inversion prevention passing port is a vehicle seat having a slit portion through which the webbing penetrates.   The vehicle seat according to claim 1, wherein the slit portion of the webbing inversion prevention passage port is provided at a portion where the direction changing portion and the first passage are connected.   3. The vehicle seat according to claim 1, wherein the webbing reversal prevention passage port and the opening of the cover are separated by 10 mm or more within a range regulated by the cover.   The vehicle seat according to claim 3, wherein the opening of the cover extends in the width direction of the vehicle and is formed into a long hole, and both end portions in the longitudinal direction are formed in a semicircular shape. The seat back or the seat cushion that supports the seat back is provided with a seat belt retractor that enables the webbing to be wound and pulled out,
The slit portion of the webbing reversal prevention passage port is formed in a long hole extending linearly in the width direction of the vehicle, and the length in the short direction perpendicular to the longitudinal direction of the slit portion is The vehicle seat according to any one of claims 1 to 4, wherein the thickness of the webbing is 1.3 to 2.2 times the thickness of the webbing.