Webbing fitting structure of air bag

Abstract

To provide a webbing fitting structure of an air bag excellent in an assembling workability while suppressing an increase in the number of components.SOLUTION: A webbing fitting structure of an air bag comprises: an air bag; a first webbing 6 and a second webbing 7; and a connection member 5 which fixes a first hook member 9 of the first webbing 6 and a second hook member 10 of the second webbing 7 to a back frame. The connection member 5 fixed to the back frame and integrally formed with a first hook part 52 and a second hook part 54 includes: a first stopper part 52c and a first locking part 51e which stop sliding of the first hook member 9 in a state where the first hook member 9 is engaged with the first hook part 52; and a second stopper part 54c and a second locking part 51f which stop sliding of the second hook member 10 in a state where the second hook member 10 is engaged with the second hook part 54. The first locking part 51e and the second locking part 51f are integrally formed in a base part 51.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a webbing attachment structure for an airbag, and more particularly to an airbag webbing attachment structure for fixing an end portion of a webbing, which is a member that regulates the deployment direction of an airbag, to a frame. [Background technology]

[0002] Conventionally, webbing is sometimes provided to smoothly open a breakable portion provided in a seat cover so that the airbag can bulge out of the seat when the airbag installed inside the vehicle seat inflates. In the vehicle seat described in Patent Document 1, a pair of band-shaped webbings arranged to surround the airbag have one end attached to the breakable portion of the seat cover and the other end attached to the seat frame via an attachment portion.

[0003] As shown in FIG. 10, the attachment portion 105 is a member for attaching the ends of a pair of belt-shaped first webbing 106 and second webbing 107 to the seat frame 131. The attachment portion 105 is flat and has a first locking portion 152, a second locking portion 154, and a fixing portion 155 fixed to the seat frame 131. The first locking portion 152 is a portion that protrudes from the attachment portion 105 and has a substantially L-shaped cross section, and is provided with a return portion 153 at its tip, so that the end of the first webbing 106 can be locked. The second locking portion 154 is a portion that protrudes from the attachment portion 105 and has a substantially L-shaped cross section, and is provided with a return portion 156 at its tip, so that the end of the second webbing 107 can be locked. One end of each of the webbings 106 and 107 is sewn to the seat cover, and the other end has locking members 109 and 110. Locking members 109, 110 are flat plate members each having a substantially J-shaped cross section, and are locked by being moved in a direction perpendicular to the plane of the drawing relative to mounting portion 105. In order to maintain this locked state, a pin-like retaining member (not shown) is provided that passes through both of locking members 109, 110 to support them and prevent them from moving relative to mounting portion 105 in the direction perpendicular to the plane of the drawing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-84080 A Summary of the Invention [Problem to be solved by the invention]

[0005] The mounting part 105 described in Patent Document 1 required a separate pin-like retaining member to maintain the state when the locking members 109, 110 arranged at the ends of the pair of belt-like webbing 106, 107 were locked and to prevent the locking members 109, 110 from coming off the mounting part 105. This resulted in an increase in the number of parts and also caused problems in terms of workability during assembly.

[0006] In view of the above problems, an object of the present invention is to provide a webbing mounting structure for an airbag which suppresses an increase in the number of parts and improves assembly workability. [Means for solving the problem]

[0007] A first aspect of the present invention is a webbing attachment structure for an airbag, the webbing attachment structure comprising: an airbag fixed to a seat frame; first and second webbing strips surrounding the airbag and guiding the inflating airbag to the outside of a seat; and a connecting member fixing one end side of the first webbing and one end side of the second webbing to the seat frame, wherein a first hook member having a substantially J-shaped cross section and extending in an in-plane direction of the first webbing is attached to the one end side of the first webbing, and a second hook member having a substantially J-shaped cross section and extending in an in-plane direction of the second webbing is attached to the one end side of the second webbing, the connecting member has a substantially planar main body portion which is fixed to the seat frame, a first hook portion having a substantially L-shaped cross section and extending in one direction in the in-plane direction of the first surface is integrally formed on a first surface of the main body portion, and a second hook portion having a substantially L-shaped cross section and extending in the one direction is integrally formed on a second surface opposite to the first surface. The connecting member is integrally formed with a first stopper portion that slides the first hook member in the one direction relative to the first hook portion, and abuts against one end side of the first hook member to stop the sliding when the hook member is engaged with the first hook portion, and a first locking portion that locks against the other end side of the first hook member to stop movement in the direction opposite to the one direction, and a second stopper portion that slides the second hook member in the one direction relative to the second hook portion, and abuts against one end side of the second hook member to stop the sliding when the second hook member is engaged with the second hook portion, and a second locking portion that locks against the other end side of the second hook member to stop movement in the direction opposite to the one direction, and the first locking portion and the second locking portion are integrally formed as snap-fit ​​type locking claw portions that are capable of moving in the same out-of-plane direction of the first surface and the second surface by elastic deformation relative to the main body portion.

[0008] According to the first aspect of the present invention, the connecting member has the first hook portion, the second hook portion, the first stopper portion, and the second stopper portion integrally formed therewith, and the first and second locking portions are integrally formed as snap-fit ​​type locking claw portions that can move in the same out-of-plane direction of the first and second surfaces by elastic deformation relative to the main body portion. This makes it possible to prevent the first and second hook members engaged with the connecting member from coming off the connecting member without requiring a separate member such as a pin, and therefore makes it possible to provide a webbing attachment structure for an airbag that is easy to assemble while suppressing an increase in the number of parts.

[0009] The second invention of the present invention is characterized in that, in the above-mentioned first invention, the first hook portion and the second hook portion are formed relative to the main body portion so that the direction from the connection portion of the first hook portion with the main body portion toward the tip portion of the portion separated from the main body portion is opposite to the direction from the connection portion of the second hook portion with the main body portion toward the tip portion of the portion separated from the main body portion.

[0010] According to the second aspect of the present invention, when a tensile force is applied to the first webbing and the second webbing, the forces acting on the connecting member cancel each other out, so that the strength required to fix the connecting member to the seat frame can be reduced, thereby simplifying the structure of the connecting member and suppressing increases in material costs.

[0011] The third invention of the present invention is characterized in that, in the first or second invention, the first and second engagement portions are part of a cantilevered beam-like body formed in the main body portion and having a substantially U-shaped cross-section extending perpendicularly to the first surface, such that the cantilevered beam-like body is capable of deforming in an out-of-plane direction of the first surface by a through hole having a substantially U-shaped cross-section extending perpendicularly to the first surface.

[0012] According to the third invention, the first and second engagement portions are part of a cantilevered beam-like body formed by a through hole having a substantially U-shaped cross section extending perpendicularly to the first surface formed in the main body, and therefore the structure is simple.

[0013] The fourth invention of the present invention is characterized in that, in the above-mentioned third invention, the beam-shaped body is formed in a state in which all or part of the through hole is blocked by a plate-shaped portion that is parallel to the first surface and thinner than the main body portion.

[0014] According to the fourth aspect of the present invention, the beam-like body is connected to the main body by a thin plate-like portion, so that the force tending to keep the beam-like body in the position before elastic deformation is increased. This makes it possible to more reliably prevent the first hook member 9 and the second hook member 10 engaged with the connecting member 5 from coming off the connecting member 5. [Brief description of the drawings]

[0015] [Figure 1] 1 is a perspective view of an automobile seat to which an airbag webbing mounting structure according to a first embodiment of the present invention is applied. [Diagram 2] 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] 11 is a perspective view showing a state in which a first hook member and a second hook member are engaged with a connecting member. FIG. [Figure 4] FIG. 4 is a side view of FIG. [Diagram 5] 5 is a cross-sectional view taken along line VV in FIG. 4. [Figure 6] 6 is a view seen from the VI direction in FIG. 4. [Figure 7] FIG. 7 is an enlarged view of part VII in FIG. 5. [Figure 8] FIG. 4 is a cross-sectional view illustrating a second embodiment of the present invention. [Figure 9] FIG. 9 is an enlarged perspective view showing a portion IX in FIG. 8. [Figure 10] FIG. 1 is a cross-sectional view illustrating a conventional technique. [Figure 11] FIG. 7 is a diagram corresponding to a portion XI in FIG. 6 for explaining a third embodiment of the present invention. [Figure 12] 12 is a cross-sectional view taken along line XII-XII in FIG. 11. [Figure 13] 13 is a cross-sectional view taken along line XIII-XIII in FIG. 11. [Figure 14]FIG. 14 is a diagram illustrating a modified example of the third embodiment, and corresponds to FIG. [Figure 15] FIG. 14 is a diagram illustrating a modified example of the third embodiment, and corresponds to FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] 1 to 7 show a first embodiment of the present invention. This embodiment is an example in which the present invention is applied to a seat back 3 of an automobile seat 1. In each figure, arrows indicate the various directions when the automobile seat 1 is installed in an automobile. In the following description, descriptions of directions will be made based on these directions. The automobile seat 1 comprises a seat cushion 2 serving as a seating portion, a seat back 3 serving as a backrest, and a headrest 4 serving as a head support portion.

[0017] 1 and 2, the seat back 3 has a back frame 31 forming a skeleton, a back pad 32 which is a cushioning material placed on the back frame 31, and a back cover 33 which is a skin material that covers the back pad 32. Here, the back frame 31 corresponds to the "seat frame" in the claims.

[0018] The back frame 31 is gate-shaped when viewed from the front, and includes a pair of left and right side frames 31a extending in the up-down direction, and an upper frame 31f connecting the upper ends of the side frames 31a. Each side frame 31a has a substantially U-shaped cross section that opens toward the inside of the seat, and includes a main body 31b, a front plate 31c extending from the front end edge of the main body 31b toward the substantially inside of the seat, and a rear plate 31d extending from the rear end edge of the main body 31b toward the substantially inside of the seat. As shown in FIG. 2, the rear plate 31d of the left side frame 31a is set to have a larger dimension extending in the left-right direction than the front plate 31c, and a bent portion 31e extending toward the front right is formed at the right end, which is the tip end toward the inside of the seat. The bent portion 31e is a portion to which a connecting member 5, which will be described later, is attached.

[0019] As shown in FIG. 2, the back pad 32 is a cushioning material made of urethane foam resin, and is a member that forms the outer shape of the seat back 3 and elastically supports the body of the seated occupant. The back pad 32 has a main part 32a in the center in the left-right direction, and a pair of side parts 32b located on both the left and right sides of the main part 32a. The main part 32a is a part that mainly supports the waist and back of the seated occupant from the rear, and each side part 32b is a part that mainly supports the waist and back of the seated occupant from the side. A first slit 32c that penetrates in the front-rear direction is formed between the main part 32a and each side part 32b, and a second slit 32d that penetrates in the left-right direction is formed in the approximately center in the front-rear direction of the left side part 32b. The first slit 32c is a part through which the first webbing 6 is passed, and the second slit 32d is a part through which the second webbing 7 is passed. A thin portion 32e is formed on the front end side of the left side portion 32b. The thin portion 32e is a portion that is broken when the airbag 8 is inflated.

[0020] As shown in FIG. 2, the back cover 33 is a member that covers the back pad 32, which is formed into a bag shape by integrating a plurality of pieces by sewing. Each piece is cut from a sheet material formed by laminating a thin urethane slab pad and a thin woven backing fabric in this order on the back side of the fabric. The back cover 33 has a main cover part 33a that covers the main part 32a from the front side, a side front cover part 33b that covers each side part 32b from the front side, and a side rear cover part 33c that covers each side part 32b from the side and rear side. The stitching part between the main cover part 33a and each side front cover part 33b is a first stitching part 33d, and the stitching part between each side front cover part 33b and each side rear cover part 33c is a second stitching part 33e. The first stitching part 33d is pulled and fixed to the back frame 31 by a hanging member (not shown). The second sewn portion 33e is formed to be weaker than the first sewn portion 33d, and is the portion that is broken and opened when the airbag 8 is inflated.

[0021] 1 and 2, the airbag 8 has a generally rectangular parallelepiped shape extending vertically when not inflated, and is fixed to the left surface of the main body 31b of the left side frame 31a by means of bolts or the like. When the vehicle receives an impact due to a collision or the like, the airbag 8 is rapidly inflated and deployed by the high-pressure gas generated by the inflator.

[0022] As shown in Fig. 2, the first webbing 6 and the second webbing 7 are strip-shaped members made of fabric less stretchable than the pieces of the back cover 33. The front end 6a of the first webbing 6 and the front end 7a of the second webbing 7 are sewn to the left end of the left side front cover part 33b and the left front end of the side rear cover part 33c by the second seam 33e. A first hook member 9 is attached to the rear end 6b of the first webbing 6 by the third seam 6c. A second hook member 10 is attached to the rear end 7b of the second webbing 7 by the fourth seam 7c. Here, the rear end 6b and the rear end 7b each correspond to "one end" in the claims.

[0023] As shown in Figs. 3 and 4, the first hook member 9 is a resin member having a substantially J-shaped cross section and extending in the up-down direction. The first hook member 9 has a substantially rectangular flat main body portion 91 and a folded portion 92 that rises from one end of the main body portion 91 and extends opposite to the main body portion 91. An inner surface 91a of the main body portion 91 facing the folded portion 92 is formed as a flat surface. A connecting surface 91c parallel to the inner surface 91a is formed on an outer surface 91b opposite to the inner surface 91a of the main body portion 91 at an end opposite to a connecting portion with the folded portion 92. The rear end side 6b, which is one end of the first webbing 6, is overlapped on the connecting surface 91c of the main body portion 91 and sewn and connected by a third sewing portion 6c. An engagement claw 92a extending toward the main body portion 91 is formed on an end opposite to the connecting portion with the main body portion 91 in the folded portion 92. The second hook member 10 has a main body 11 having a substantially rectangular flat plate shape and a folded portion 12 that rises from one end of the main body 11 and extends opposite the main body 11. An inner surface 11a, which is a surface of the main body 11 facing the folded portion 12, is formed as a flat surface. A connecting surface 11c parallel to the inner surface 11a is formed on an outer surface 11b opposite to the inner surface 11a of the main body 11 at an end opposite to a connecting portion with the folded portion 12. A rear end side 7b, which is one end of the second webbing 7, is overlapped on the connecting surface 11c of the main body 11 and sewn and connected by four stitching portions 7c. An engagement claw 12a extending toward the main body 11 is formed on an end opposite to the connecting portion with the main body 11 in the folded portion 12. The vertical dimension of the first hook member 9 is set to about 1.2 times the vertical dimension of the second hook member 10.

[0024] 2 to 7, the connecting member 5 has a substantially rectangular flat base portion 51, a first hook portion 52 and a first webbing contact portion 53 disposed on the left end side of the base portion 51, and a second hook portion 54 and a frame fixing portion 55 disposed on the right end side of the base portion 51. Here, the base portion 51 corresponds to the "main body" in the claims.

[0025] As shown in Figs. 3 to 5, the base portion 51 has a first surface S1 which is a rear surface and a second surface S2 which is a front surface. A protrusion 51a protruding upward is formed on the upper end side of the base portion 51. A substantially U-shaped through hole 51b opening upward is formed on the lower side of the protrusion 51a, thereby forming a locking claw portion 51c which is elastically deformable in an out-of-plane direction with respect to the first surface S1 and the second surface S2 of the base portion 51. In detail, the locking claw portion 51c has a beam plate portion 51d which extends downward from the lower end of the protrusion 51a in a cantilever shape, a first locking portion 51e which extends vertically from the tip of the beam plate portion 51d in the direction of the first hook portion 52, and a second locking portion 51f which extends vertically from the tip of the beam plate portion 51d in the direction of the second hook portion 54. The protrusion 51a is a portion that performs a reinforcing function for the upper root portion of the beam plate portion 51d. Between the first locking portion 51e and the beam plate portion 51d, a pair of first inclined portions 51g that connect the tip portion of the first locking portion 51e and the beam plate portion 51d are formed, and between the second locking portion 51f and the beam plate portion 51d, a pair of second inclined portions 51h that connect the tip portion of the second locking portion 51f and the beam plate portion 51d are formed. When the first inclined portions 51g abut against the base portion 51 and the folded portion 92 of the first hook member 9 slides from top to bottom, the first inclined portions 51g bend the beam plate portion 51d in the direction of the second locking portion 51f to allow the folded portion 92 to pass through. The second inclined portion 51h serves to deflect the beam plate portion 51d in the direction of the first locking portion 51e to allow the folded portion 12 to pass when the folded portion 12 of the second hook member 10 slides downward while abutting against the base portion 51. In FIG. 8, the folded portion 12 of the second hook member 10 slides downward while abutting against the base portion 51, and the second inclined portion 51h slides to deflect the beam plate portion 51d in the direction of the first locking portion 51e. When the folded portion 92 of the first hook member 9 slides downward while abutting against the base portion 51, the first inclined portion 51g slides to deflect the beam plate portion 51d in the direction of the second locking portion 51f. The same is true except for the direction of deflection. Here, the locking claw portion 51c corresponds to the "beam-shaped body" in the claims.

[0026] As shown in Figs. 3 to 5, a first hook portion 52 having a substantially L-shaped cross section is disposed on the front end side of the base portion 51, rising substantially rearward from the first surface S1 of the base portion 51 and extending in the up-down direction opposite to the first surface S1 of the base portion 51. An engagement claw 52a extending toward the base portion 51 is formed on the side of a tip portion 52d of the surface of the first hook portion 52 facing the first surface S1 of the base portion 51. An outer surface 52b, which is the surface of the first hook portion 52 opposite to the base portion 51, is formed as a flat surface parallel to the first surface S1 of the base portion 51. A substantially rectangular column-shaped first stopper portion 52c is formed on the lower end side of the outer surface 52b of the first hook portion 52 in correspondence with the first locking portion 51e. When the inner surface 91a abuts against the outer surface 52b and the main body portion 91 of the first hook member 9 slides from top to bottom, the first stopper portion 52c abuts against the lower end of the main body portion 91 to stop the sliding of the first hook member 9. Furthermore, a first webbing abutment portion 53 having a contact surface 53a that abuts against the first webbing 6 and guides the first webbing 6 is disposed on the front end side of the base portion 51. Here, the up-down direction corresponds to "one direction" in the claims.

[0027] As shown in Figs. 3 to 5, a second hook portion 54 having a substantially L-shaped cross section is disposed on the rear end side of the base portion 51, rising substantially forward from the second surface S2 of the base portion 51 and extending in the up-down direction opposite to the second surface S2 of the base portion 51. An engagement claw 54a extending toward the base portion 51 is formed on the tip portion 54d side of the surface of the second hook portion 54 facing the second surface S2 of the base portion 51. An outer surface 54b, which is the surface of the second hook portion 54 opposite to the base portion 51, is formed as a flat surface parallel to the second surface S2 of the base portion 51. A substantially rectangular column-shaped second stopper portion 54c is formed on the lower end side of the outer surface 54b of the second hook portion 54 in correspondence with the second locking portion 51f. When the inner surface 11a of the second hook member 10 abuts against the outer surface 54b and the main body portion 11 of the second hook member 10 slides downward, the second stopper portion 54c abuts against the lower end of the main body portion 11 to stop the sliding of the second hook member 10. Furthermore, a frame fixing portion 55 for fixing the connecting member 5 to the bent portion 31e of the back frame 31 is disposed on the rear end side of the base portion 51. The frame fixing portion 55 has a rear gripping portion 55a for gripping the bent portion 31e of the back frame 31 from the rear side and a front gripping portion 55b for gripping it from the front side. The connecting member 5 is moved in the vertical direction so that the rear gripping portion 55a and the front gripping portion 55b grip the bent portion 31e of the back frame 31, whereby the connecting member 5 is fixed to the bent portion 31e of the back frame 31.

[0028] The assembly procedure of the seat back 3 will be described with reference to Figs. 2 to 5. The back pad 32 is placed on the back frame 31 to which the airbag 8 and the connecting member 5 are attached, and the back cover 33 is placed on top of the back pad 32. In the process, the first webbing 6 is passed through the first slit 32c of the back pad 32 from the side of the first hook member 9, and the first hook member 9 is engaged with the first hook portion 52 of the connecting member 5 while the first webbing 6 is abutted against the abutment surface 53a of the connecting member 5. Specifically, when the first hook member 9 is slid from top to bottom while the inner surface 91a of the first hook portion 52 is abutted against the outer surface 52b of the first hook portion 52, the tip side of the folded portion 92 abuts against the first inclined portion 51g and slides, thereby bending the beam plate portion 51d in the direction of the second locking portion 51f. Then, when the tip side of the folded portion 92 passes the first locking portion 51e, the beam plate portion 51d returns to its original state. When the first hook member 9 is further slid downward, the lower end side of the main body portion 91 of the first hook member 9 abuts against the first stopper portion 52c and the sliding is stopped. When the first hook member 9 is moved upward in this state, the upper end side of the folded portion 92 of the first hook member 9 abuts against the first locking portion 51e and the sliding is stopped. That is, the engagement of the first hook member 9 with the first hook portion 52 of the connecting member 5 is maintained. In addition, in the process of placing the back pad 32 on the back frame 31 and covering it with the back cover 33, the second webbing 7 is passed through the second slit 32d of the back pad 32 from the side of the second hook member 10 and abutted against the rear side surface of the frame fixing portion 55 of the connecting member 5, and the second hook member 10 is engaged with the second hook portion 54 of the connecting member 5. Specifically, when the second hook member 10 is slid downward with the inner surface 11a of the second hook member 10 in contact with the outer surface 54b of the second hook portion 54, the tip side of the folded portion 12 comes into contact with the second inclined portion 51h and slides, bending the beam plate portion 51d toward the first locking portion 51e. When the tip side of the folded portion 12 passes the second locking portion 51f, the beam plate portion 51d returns to its original state. When the second hook member 10 is further slid downward, the lower end side of the main body portion 11 of the second hook member 10 comes into contact with the second stopper portion 54c and the sliding is stopped.When second hook member 10 is moved upward in this state, the upper end side of folded portion 12 of second hook member 10 abuts against second locking portion 51f, thereby stopping the sliding movement. That is, the engagement of second hook member 10 with second hook portion 54 of connecting member 5 is maintained.

[0029] The present embodiment configured as above provides the following advantageous effects. The first hook portion 52, the second hook portion 54, the first stopper portion 52c, and the second stopper portion 54c are integrally formed in the connecting member 5. The first locking portion 51e and the second locking portion 51f are integrally formed in the connecting member 5 as a snap-fit ​​type locking claw portion 51c that can move in the same direction out of the plane of the first surface S1 and the second surface S2 by elastic deformation relative to the base portion 51. This makes it possible to prevent the first hook member 9 and the second hook member 10 engaged with the connecting member 5 from coming off the connecting member 5 without requiring a separate member such as a pin, and therefore provides a webbing attachment structure for an airbag that is easy to assemble by suppressing an increase in the number of parts.

[0030] In addition, the first hook portion 52 and the second hook portion 54 are formed on the base portion 51 so that the direction from the joint portion of the first hook portion 52 with the base portion 51 toward the tip portion 52d is opposite to the direction from the joint portion of the second hook portion 54 with the base portion 51 toward the tip portion 54d. As a result, when a tensile force is applied to the first webbing 6 and the second webbing 7, the forces acting on the connecting member 5 act to cancel each other out, so that the strength required to fix the connecting member 5 to the back frame 31 can be reduced and the structure of the connecting member 5 can be simplified to suppress an increase in material costs.

[0031] 8 and 9 show the second embodiment of the present invention. The difference from the first embodiment is that the shape of the connecting member 5A is different from that of the connecting member 5. The same reference numerals are used for the configurations common to the first embodiment, and the description is omitted. Specifically, the vertical dimension of the base portion 51A of the connecting member 5A is set to be approximately twice as large as the vertical dimension of the base portion 51, and the first hook portion 52 and the second hook portion 54 are formed at positions spaced apart vertically. In addition, the locking claw portion 51C is different from the locking claw portion 51c. The substantially U-shaped through hole 51B formed in the substantially central portion of the base portion 51A in the vertical direction is set to be larger in the vertical direction than the through hole 51b, and accordingly, the vertical dimension of the beam plate portion 51D is also set to be larger than the vertical dimension of the beam plate portion 51d. A second locking portion 51F is formed at the lower end, which is the tip of the beam plate portion 51D, and a pair of second inclined portions 51H are formed to connect the tip of the second locking portion 51F and the beam plate portion 51D. A first locking portion 51E extending in the opposite direction to the second locking portion 51F is formed at the approximate center in the vertical direction of the beam plate portion 51D, and a pair of first inclined portions 51G connecting the tip of the first locking portion 51E and the beam plate portion 51D are formed extending toward the tip side of the beam plate portion 51D. Here, the base portion 51A corresponds to the "main body portion" in the claims. Also, the locking claw portion 51C corresponds to the "beam-shaped body" in the claims.

[0032] 2 to 5, 8 and 9, the procedure for assembling the seat back 3 will be described. The back pad 32 is placed on the back frame 31 to which the airbag 8 and the connecting member 5A are attached, and the back cover 33 is placed on top of the back pad 32. In the process, the first webbing 6 is passed through the first slit 32c of the back pad 32 from the side of the first hook member 9, and the first hook member 9 is engaged with the first hook portion 52 of the connecting member 5A in a state where the first webbing 6 is abutted against the abutment surface 53a of the connecting member 5A. Specifically, when the first hook member 9 is slid from bottom to top in a state where the inner surface 91a of the first hook member 9 is abutted against the outer surface 52b of the first hook portion 52, the tip side of the folded portion 92 abuts against and slides against the first inclined portion 51G, thereby bending the beam plate portion 51D in a direction that allows the first hook member 9 to move from bottom to top. Then, when the tip side of the folded-back portion 92 passes through the first locking portion 51E, the beam plate portion 51D returns to its original state. When the first hook member 9 is further slid upward, the upper end side of the main portion 91 of the first hook member 9 abuts against the first stopper portion 52c and the sliding is stopped. When the first hook member 9 is moved downward in this state, the lower end side of the folded-back portion 92 of the first hook member 9 abuts against the first locking portion 51E and the sliding is stopped. That is, the engagement of the first hook member 9 with the first hook portion 52 of the connecting member 5A is maintained. In the process of placing the back pad 32 on the back frame 31 and covering it with the back cover 33, the second webbing 7 is passed through the second slit 32d of the back pad 32 from the side of the second hook member 10 and abuts against the rear side surface of the frame fixing portion 55 of the connecting member 5A, and the second hook member 10 is engaged with the second hook portion 54 of the connecting member 5A. Specifically, when the second hook member 10 is slid from top to bottom with the inner surface 11a of the second hook member 10 in contact with the outer surface 54b of the second hook portion 54, the tip side of the folded portion 12 abuts against the second inclined portion 51H and slides, bending the beam plate portion 51D in a direction that allows the second hook member 10 to move from top to bottom. Then, when the tip side of the folded portion 12 passes through the second locking portion 51F, the beam plate portion 51D returns to its original state. When the second hook member 10 is further slid downward, the lower end side of the main portion 11 of the second hook member 10 abuts against the second stopper portion 54c and the sliding is stopped.When second hook member 10 is moved upward in this state, the upper end side of folded portion 12 of second hook member 10 abuts against second locking portion 51F to stop the sliding movement. That is, the engagement of second hook member 10 with second hook portion 54 of connecting member 5A is maintained.

[0033] The present embodiment configured as above provides the following advantageous effects. The first hook portion 52, the second hook portion 54, the first stopper portion 52c, and the second stopper portion 54c are integrally formed in the connecting member 5A. The first and second locking portions 51E and 51F are integrally formed in the connecting member 5A as snap-fit ​​type locking claw portions 51C that can move in the out-of-plane direction of the first surface S1 and the second surface S2 by elastic deformation relative to the base portion 51A. This makes it possible to prevent the first hook member 9 and the second hook member 10 engaged with the connecting member 5A from coming off the connecting member 5A without requiring a separate member such as a pin, and therefore provides a webbing attachment structure for an airbag that is easy to assemble by suppressing an increase in the number of parts.

[0034] 11 to 13 show the third embodiment of the present invention. The difference from the first embodiment is that the shape of the base portion 51K in the connecting member 5 is different from that of the base portion 51. The same reference numerals are used for the configurations common to the first embodiment, and the description is omitted. Specifically, the substantially U-shaped through hole 51b around the locking claw portion 51c in the base portion 51 is closed by a thin plate-like portion 51L parallel to the first surface S1 and the second surface S2, and the locking claw portion 51c is connected to the main body portion of the base portion 51. More specifically, the thickness of the plate-like portion 51L is set to about 1 / 4 to 1 / 3 of the thickness of the protrusion portion 51a and the beam plate portion 51d. The plate-like portion 51L is disposed at a position that connects the center of the thickness direction of the beam plate portion 51d and the center of the thickness direction of the main body portion of the base portion 51K.

[0035] The present embodiment configured as above provides the following advantageous effects. Since the locking claw portion 51c of the base portion 51K is connected to the main body of the base portion 51K by the thin plate-like portion 51L, the force that tries to keep the locking claw portion 51c in the position before elastic deformation is increased. This makes it possible to more reliably prevent the first hook member 9 and the second hook member 10 engaged with the connecting member 5 from coming off the connecting member 5.

[0036] 14 and 15 show a modified example of the third embodiment. The plate-shaped portion 51L may be disposed only at the tip of the locking claw portion 51c as shown in FIG. 14, or may be disposed only on both sides of the tip side of the locking claw portion 51c as shown in FIG. 15. When the plate-shaped portion 51L is disposed partially in this manner, the force that tries to hold the locking claw portion 51c in the position before elastic deformation can be adjusted between the case where the plate-shaped portion 51L is disposed entirely as shown in FIG. 11 and the case where the plate-shaped portion 51L is not disposed entirely. This makes it possible to more reliably prevent the first hook member 9 and the second hook member 10 engaged with the connecting member 5 from coming off the connecting member 5.

[0037] Although specific embodiments have been described above, the present invention is not limited to those external appearances and configurations, and various modifications, additions, and deletions are possible without departing from the spirit of the present invention. For example, the following can be mentioned.

[0038] 1. In the above embodiment, the airbag 8 is configured to be disposed on the left side frame 31a, but the airbag 8 may be disposed on each of the left and right side frames 31a. In that case, the first webbing 6 and the second webbing 7, the first hook member 9 and the second hook member 10, and the connecting members 5, 5A are disposed on the left and right side frames 31a in a symmetrical shape, respectively.

[0039] 2. In the above embodiment, the first stopper portion 52c is provided on the first hook portion 52, and the second stopper portion 54c is provided on the second hook portion 54. However, this is not limited to this, and the first stopper portion 52c and / or the second stopper portion 54c may be provided on the base portion 51.

[0040] 3. In the above embodiment, the present invention is applied to the seat back 3 of the automobile seat 1, but it can also be applied to the seat cushion 2. Furthermore, it may be applied to seats installed in airplanes, ships, trains, etc. [Explanation of symbols]

[0041] 1. Car seats 3 Seat back 5 Connecting members 5A Connecting member 6 1st Rikifu 6b Rear end side (one end side) 7 2nd Rikifu 7b Rear end side (one end side) 8. Airbags 9 First hook member 10 Second hook member 31 Back frame (seat frame) 51 Base part (main body part) 51A Base part (main body part) 51c Locking claw part (beam-shaped body) 51C Locking claw part (beam-shaped body) 51e 1st locking part 51E 1st locking part 51f 2nd locking part 51F 2nd locking part 51K Base (main body) 51L Plate-shaped part 52 First hook part 52c First stopper part 52d Tip 54 Second hook part 54c Second stopper part 54d Tip S1 page 1 S2 side 2

Claims

1. An airbag webbing mounting structure, comprising: an airbag fixed to a seat frame; first and second webbing strips surrounding the airbag and guiding the inflating airbag to an outside of a seat; and a connecting member fixing one end side of the first webbing and one end side of the second webbing to the seat frame, a first hook member having a substantially J-shaped cross section and extending in an in-plane direction of the first webbing is attached to the one end side of the first webbing, and a second hook member having a substantially J-shaped cross section and extending in an in-plane direction of the second webbing is attached to the one end side of the second webbing, The connecting member has a substantially planar main body portion, and the main body portion is fixed to the seat frame, A first hook portion having a generally L-shaped cross section and extending in one direction in the plane of the first surface is integrally formed on a first surface of the main body, and a second hook portion having a generally L-shaped cross section and extending in the one direction is integrally formed on a second surface opposite to the first surface, the connecting member is integrally formed with a first stopper portion that causes the first hook member to slide in the one direction relative to the first hook portion, and abuts against one end side of the first hook member to stop the sliding when the first hook member is engaged with the first hook portion, and a first locking portion that locks against the other end side of the first hook member to stop the movement in the direction opposite to the one direction; and a second stopper portion that causes the second hook member to slide in the one direction relative to the second hook portion, and abuts against one end side of the second hook member to stop the sliding when the second hook member is engaged with the second hook portion, and a second locking portion that locks against the other end side of the second hook member to stop the movement in the direction opposite to the one direction, The first and second engaging portions are integrally formed as snap-fit ​​type engaging claw portions that are capable of moving in the same out-of-plane direction of the first and second surfaces by elastic deformation relative to the main body portion.

2. In claim 1, An airbag webbing mounting structure, in which the first hook portion and the second hook portion are formed with respect to the main body portion so that a direction from a connection portion of the first hook portion with the main body portion toward a tip portion of a portion separated from the main body portion is opposite to a direction from a connection portion of the second hook portion with the main body portion toward a tip portion of a portion separated from the main body portion.

3. In claim 1 or 2, The airbag webbing mounting structure, wherein the first and second engaging portions are part of a cantilevered beam-like body that is formed so as to be deformable in an out-of-plane direction of the first surface by a through hole that has a substantially U-shaped cross section extending perpendicularly to the first surface formed in the main body portion.

4. In claim 3, The beam-like body has a webbing mounting structure for an airbag, the through hole being entirely or partially blocked by a plate-like portion that is parallel to the first surface and is thinner than the main body portion.

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