JP6276653B2 - Backrest frame - Google Patents

Description

  The present invention relates to a backrest frame.

  Patent Document 1 (see FIG. 1) discloses a frame of a backrest of a vehicle seat. Specifically, one bar is formed into a rectangular frame shape by bending, one end of the bar is separated from the other end of the bar, and one end and the other end of the bar are Facing each other. A gap between one end and the other end of the bar is formed near the lower end of the side portion of the frame. A side bracket is attached to the side of the frame so as to straddle the gap between one end and the other end of the bar, and the bracket is connected to the rear end of the frame of the seat. The lower end of the backrest frame and the frame of the seat are connected to each other on the opposite side portion by another bracket. According to such a configuration, since it is possible to omit the endless shape by welding one end and the other end of the bar, it is possible to reduce the manufacturing process of the backrest frame.

JP 2012-30633 A

However, since the gap between one end and the other end of the bar is far away from the upper end of the backrest frame, if a large load is applied to the backrest from before the backrest, the moment around the gap increases and the backrest The amount of deformation of the frame becomes large.
Therefore, the problem to be solved by the present invention is to suppress the deformation amount of the frame even when a large load is applied to the frame of the backrest.

  In order to solve the above problems, the frame of the backrest is obtained by bending a bar in a frame shape when viewed from the front, a side frame attached to a side portion of the skeleton member, and the skeleton member User support members provided on the left and right sides on the inner side, and one end of the bar is separated from the other end of the bar to face the other end of the bar, and one end and the other end of the bar Is formed on a side portion of the skeleton member, and the side frame is attached to the side portion of the skeleton member so as to straddle the gap, and the gap is more than the user support member. Is placed on top.

Since the gap between one end and the other end of the bar is arranged above the user support member, the gap is arranged closer to the upper end of the skeleton member. Therefore, even when a large load is applied to the backrest from before the backrest, the moment around the gap can be reduced. Therefore, the deformation amount of the backrest frame can be suppressed.
Further, when the load is applied to the backrest from before the backrest, the load is received by the user support member. Therefore, the load applied to the frame can be reduced by the user support member. Therefore, the deformation amount of the backrest frame can be suppressed.

  According to the first aspect of the present invention, when the load is applied to the backrest from before the backrest, the moment around the gap between one end and the other end of the bar can be reduced, and the deformation amount of the skeleton member Can be suppressed.

  According to the invention of claim 2, since the gap between the one end and the other end of the bar is disposed above the fixing portion of the airbag module by the fastener, the side portion of the skeleton member hits the side frame. The part will be placed near the fixed point. Therefore, the fixing location of the airbag module by the fastener can be reinforced by the skeleton member, and the rigidity of the side frame at the fixing location can be ensured.

  According to the third aspect of the present invention, the side frame provided so as to straddle the gap between the one end and the other end of the bar is located above the gap so that the side portion of the skeleton member extends back and forth. The side portions of the skeleton member are fixed so as to be sandwiched, and the vertical position of the fixing portion is aligned with the vertical position of the connecting portion between the side portion of the skeleton member and the reinforcing member. Increased connectivity. Therefore, when the load is applied to the backrest from before the backrest, the deformation of the skeleton member can be suppressed.

  According to the invention of claim 4, the vertical width of the gap is narrower than the vertical width of the reinforcing member, and the distance over which the side frame straddles the gap is shortened. Become effective. Therefore, when the load is applied to the backrest from before the backrest, the deformation of the skeleton member can be suppressed.

According to the fifth aspect of the present invention, since the user support member is a spring bent into a wave shape with the vertical direction as the amplitude direction, when the user leans on the back, the user support member pushes back. Being elastically stretched. Therefore, the user can be stably supported by the user support member. Since the vertical width of the user support member is wider than the vertical width of the gap, the stability of user support is improved.
Further, since the vertical width of the gap is narrower than the vertical width of the user support member, when the load is applied to the backrest from before the backrest, the moment around the gap can be reduced. Therefore, the deformation amount of the backrest frame can be suppressed.

According to the invention which concerns on Claim 6, the part above the one end of a bar is welded to a side frame among the side parts of a frame member, and the part below the multi-end of a bar is among the side parts of a frame member Is welded to the side frame, the vicinity of the gap between one end and the other end of the bar is fixed to the side frame. Therefore, the reinforcement of the skeleton member by the side frame becomes more effective. Therefore, when the load is applied to the backrest from before the backrest, the deformation of the skeleton member can be suppressed.
Since the part between the first hole and the second hole in the side frame is aligned with the gap between the ends of the bar and the vertical position, the part between the first hole and the second hole is the bar. The gap between both ends is attached from the side. Therefore, when the load is applied to the backrest from before the backrest, the deformation of the skeleton member around the gap between both ends of the bar can be suppressed.

  According to the seventh aspect of the present invention, since one end of the bar protrudes below the lower edge of the first hole, the first hole does not face the gap between both ends of the bar. Therefore, the range in which the portion between the first hole and the second hole attaches the gap between both ends of the bar from the side is widened. Therefore, when the load is applied to the backrest from before the backrest, the deformation of the skeleton member around the gap between both ends of the bar can be suppressed.

  According to the invention of claim 8, since the other end of the bar protrudes above the upper edge of the second hole, the second hole does not face the gap between both ends of the bar. Therefore, the range in which the portion between the first hole and the second hole attaches the gap between both ends of the bar from the side is widened. Therefore, when the load is applied to the backrest from before the backrest, the deformation of the skeleton member around the gap between both ends of the bar can be suppressed.

It is a perspective view of a sheet concerning an embodiment of the invention. It is a perspective view of the frame of the backrest concerning the embodiment. It is an enlarged view of III part. It is the perspective view which projected and viewed the III section from the back side. It is sectional drawing of a VV surface. FIG. 3 is a perspective view of a frame projected from a different direction from FIG. 2. It is sectional drawing of the VV surface which concerns on a modification. It is sectional drawing of the VV surface which concerns on a modification. It is sectional drawing of the VV surface which concerns on a modification.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. However, various technically preferable limitations for carrying out the present invention are given to the following embodiments, and the scope of the present invention is not limited to the following embodiments and illustrated examples.

  FIG. 1 is a perspective view of the seat 1. In the following description, “left” and “right” are defined when viewed from the back to the front of the seat 1. That is, “left” and “right” are determined from the viewpoint of the person seated on the seat 1.

The seat 1 is a vehicle seat, and particularly a vehicle seat provided in the interior of an automobile. The seat 1 includes a seat portion 3, a backrest 4 and a headrest 6.
A seat 3 is provided on the floor. A front-rear position adjustment mechanism and a vertical position adjustment mechanism are provided between the seat part 3 and the floor, and the position of the seat part 3 in the front-rear direction is adjusted by the front-rear position adjustment mechanism. Is adjusted by the vertical position adjustment mechanism.

The lower end of the backrest 4 is connected to the rear portion of the seat portion 3 by a reclining mechanism, and the backrest 4 is provided in a state of being stood at the rear portion of the seat portion 3. The reclining mechanism adjusts the inclination of the backrest 4. The reclining mechanism tilts the backrest 4 back and forth around its lower end.
The headrest 6 is provided at the upper end of the backrest 6.

FIG. 2 is a perspective view of the frame 10 of the backrest 4. FIG. 3 is an enlarged view of part III shown in FIG. FIG. 4 is a perspective view of the portion III shown in FIG. 2 projected from the rear side.
The backrest 4 has a frame 10, a pad, an epidermis and the like. A foam-molded pad is provided on the frame 10 so as to wrap the frame 10 from the front side of the frame 10, and an outer skin is suspended on the surface of the pad. “Hanging” means that the surface of the pad is stretched along the surface of the pad.

  The frame 10 is a skeleton structure that forms the skeleton of the backrest 4. The frame 10 includes a skeleton member 20, a side frame (side member) 40, an upper member (plate-shaped reinforcing member) 60, a side connecting member 70, user support members 80 and 85, support members 91 and 92, an airbag module 95, and the like. Prepare.

  The skeleton member 20 is shaped like a frame. Specifically, the skeleton member 20 is formed by bending one metal bar (especially a steel pipe) into a frame shape, and the gaps 23 are formed between both ends 21 and 22 of the bar. It was obtained by placing and facing each other.

  The side column 24 is the left part of the skeleton member 20. This side column 24 extends vertically. The upper end of the side column 24 is bent, the upper beam 25 continues from the upper end of the side column 24 to the right, and the upper beam 25 extends left and right. The upper beam 25 is the upper part of the skeleton member 20, and the bent portion 26 between the side column 24 and the upper beam 25 is the upper left corner of the skeleton member 20. The right end of the upper beam 25 is bent, the side upper column 27 continues downward from the right end of the upper beam 25, and the side upper column 27 extends vertically. The side upper column 27 is the upper right part of the skeleton member 20, and the bent portion 28 between the upper beam 25 and the side upper column 27 is the upper right part of the skeleton member 20. The lower end of the side column 24 is bent, the lower beam 29 continues to the right from the lower end of the side column 24, and the lower beam 29 extends left and right. The lower beam 29 is a lower part of the skeleton member 20, and the bent portion 30 between the side column 24 and the lower beam 29 is a lower left corner part of the skeleton member 20. The right end of the lower beam 29 is bent, the side lower column 31 continues upward from the right end of the lower beam 29, and the side lower column 31 extends vertically. The side lower column 31 is a lower right portion of the skeleton member 20, and the bent portion 32 between the lower beam 29 and the side lower column 29 is a lower right corner portion of the skeleton member 20.

  The upper end 22 of the side lower support column 31 is disposed below the lower end 21 of the side upper support column 27, and the lower end 21 of the side upper support column 27 and the upper end 22 of the side lower support column 31 face each other vertically. The sum of the vertical length of the side lower column 31 and the vertical length of the side upper column 27 is shorter than the vertical length of the side column 24. The gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is located above the intermediate point between the bent portion 28 and the bent portion 32. The vertical length of the side lower column 31 is shorter than the vertical length of the side upper column 27.

  Support members 91 and 92 are attached to the upper beam 25 by welding. The support tools 91 and 92 are for supporting the headrest 6.

  The upper member 60 is a strip made of metal (particularly steel). The front-rear thickness of the upper member 60 is shorter than the vertical width W1 (see FIG. 3) of the upper member 60. The upper member 60 is bridged between the upper part of the side column 24 and the upper and lower intermediate part of the side upper column 27. A welded portion 61 is formed at the left end of the upper member 60, and the left end of the upper member 60 is joined to the side column 24 by the welded portion 61. A welded portion 62 is formed at the right end of the upper member 60, and the right end of the upper member 60 is joined to the side upper column 27 by the welded portion 62. The position of the welded portion 62 is above the position of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31.

  As shown in FIG. 3, the upper and lower width W <b> 1 of the upper member 60 is wider than the width W <b> 2 of the gap 23. The upper member 60 is disposed on the back side of the pad, and the pad is supported by the upper member 60.

  As shown in FIG. 2, the side connecting member 70 is attached to the lower end of the side column 24 by welding or the like. The side connecting member 70 is provided with a rotating shaft 71, and the side connecting member 70 is connected to the left rear end portion of the frame of the seat portion 3 by the rotating shaft 71. The side connection member 70 and the frame of the seat portion 3 are provided so as to be rotatable about the rotation shaft 71.

  The side frame 40 is attached to the right side portion of the skeleton member 20 so as to straddle the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31.

  The side frame 40 includes a side plate 41, a rear flange 42, a front flange 43, a lower flange 44, and the like. The side plate 41 is a plate-like member made of metal (particularly steel). A rear flange 42 is provided along the rear edge of the side plate 41, and the rear flange 42 extends from the rear edge of the side plate 41 toward the left inner side. A front flange 43 is provided along the front edge of the side plate 41, and the front flange 43 extends from the front edge of the side plate 41 toward the left inner side. A lower flange 44 is provided along the lower edge of the side plate 41, and the lower flange 44 extends from the lower edge of the side plate 41 toward the left inner side. The side plate 41, the rear flange 42, the front flange 43, and the lower flange 44 are integrally formed. The front and rear width of the side plate 41 is narrower on the upper side than the lower side, and the interval between the rear flange 42 and the front flange 43 is narrower on the upper side than the lower side.

  The side frame 40 is connected to the right rear end portion of the frame of the seat portion 3 by a reclining mechanism 99, and the side frame 40 and the frame of the seat portion 3 are provided so as to be rotatable around the rotation shaft 71. The reclining mechanism 99 locks the rotation of the side frame 40 with respect to the frame of the seat portion 3 and urges the side frame 40 to be raised by releasing the lock.

  The side plate 41 is disposed on the right outer side of the side upper column 27 and the side lower column 31, and the left inner surface of the side plate 41 abuts the right side surface on the side upper column 27 and the side lower column 31. The rear flange 42 is disposed on the rear side of the side upper column 27 and the side lower column 31, and the front flange 43 is disposed on the front side of the side upper column 27 and the side lower column 31. The side upper column 27 and the side lower column 31 extend vertically along the corner formed between the rear flange 42 and the side plate 41. The side upper column 27 is in contact with the front surface of the rear flange 42 and the rear surface of the front flange 43, and is sandwiched between the rear flange 42 and the front flange 43. The side lower column 31 contacts the front surface of the rear flange 42, but is separated rearward from the rear surface of the front flange 43.

  In the vicinity of the gap 23, the side plate 41 is joined to the side upper column 27 and the side lower column 31 by welding. With reference to FIG.4 and FIG.5, while demonstrating below the junction part of the side plate 41 and the side upper support | pillar 27, the junction of the side plate 41 and the side lower support | pillar 31 is demonstrated below. Here, FIG. 5 is a sectional view showing the VV plane shown in FIG. 4 as viewed from the front.

  In the side plate 41, vertically long holes 45 and 46 are formed. The holes 45 and 46 are arranged vertically with a space therebetween. The side upper column 27 comes into contact with the side plate 41 so that the hole 45 is closed by the side upper column 27. A welded portion 47 is formed along the edge of the hole 45, and the side upper column 27 is joined to the side plate 41 by the welded portion 47. The side lower column 31 contacts the side plate 41 so that the hole 46 is closed by the side lower column 31. A welded portion 48 is formed along the edge of the hole 46, and the side lower support column 31 is joined to the side plate 41 by the welded portion 48.

  The side upper column 27 protrudes downward from the lower edge of the hole 45, and the side lower column 31 protrudes upward from the upper edge of the hole 46. A gap W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower than a gap W3 between the hole 45 and the hole 46. A gap 23 between the upper end 22 of the column 31 is covered from a side by a portion 49 between the hole 45 and the hole 46.

  In the vicinity of the gap 23, the rear flange 42 is joined to the side upper column 27 and the side lower column 31 by welding. The joint between the rear flange 42 and the side upper column 27 will be described below, and the connection between the rear flange 42 and the side lower column 31 will be described below.

  Vertical holes 50 and 51 are formed in the rear flange 42. The holes 50 and 51 are lined up and down with an interval between them. The side upper column 27 comes into contact with the front surface of the rear flange 42 such that the hole 50 is closed by the side upper column 27. A welded portion 52 is formed along the edge of the hole 50, and the side upper column 27 is joined to the rear flange 42 by the welded portion 52. The side lower column 31 comes into contact with the front surface of the rear flange 42 such that the hole 51 is closed by the side lower column 31. A welded portion 53 is formed along the edge of the hole 51, and the side lower support 31 is joined to the rear flange 42 by the welded portion 53.

  The side upper column 27 protrudes downward from the lower edge of the hole 50, and the side lower column 31 protrudes upward from the upper edge of the hole 51. A gap W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower than a gap W4 between the hole 50 and the hole 51. A gap 23 between the upper end 22 of the column 31 is covered from behind by a portion 54 between the hole 50 and the hole 51.

  Next, with reference to FIGS. 3 and 4, the joining of the side frame 40 and the side upper column 27 at the upper end portion of the side frame 40 will be described. The side upper column 27 is joined to the rear flange 42 and the front flange 43 by welding while being sandwiched between the upper part of the rear flange 42 and the upper part of the front flange 43. Specifically, a welded portion 55 is formed at the upper portion of the edge of the rear flange 42, and the side upper strut 27 and the rear flange 42 are joined by the welded portion 55, and the welded portion 56 is formed at the upper portion of the edge of the front flange 43. The side upper strut 27 and the front flange 43 are joined by the welded portion 56.

  The welded portion 55, the welded portion 56, and the welded portion 62 are aligned in the vertical direction (the extending direction of the side upper column 27 and the side lower column 31). The positions of the welded portions 55, 56, and 62 are higher than the position of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31.

  As shown in FIG. 2, when the frame 10 of the backrest 4 is viewed from the front, user support members 80 and 85 are installed inside the skeleton member 20. The user support members 80 and 85 are springs bent into a wave shape with the vertical direction as the amplitude direction. That is, the user support members 80 and 85 are obtained by bending a wire (wire) so as to wave up and down when viewed from the front.

  One end of the user support member 80 is attached to the attachment portion 81 by being hooked on the attachment portion 81. The mounting portion 81 is formed so as to protrude from the left inner surface of the side plate 41. The other end of the user support member 80 is attached to the attachment portion 82 by being caught by the attachment portion 82. The attachment portion 81 is welded to the side column 24. Thus, the user support member 80 is provided so as to be bridged from the attachment portion 81 to the attachment portion 82 in the left and right direction.

The attachment portion 81 is disposed at an intermediate portion between the upper end and the lower end of the side frame 40. The mounting portion 81 and the mounting portion 82 are aligned in the vertical direction (the extending direction of the side upper column 27 and the side lower column 31). The vertical positions of the attachment portion 81 and the attachment portion 82 are lower than the vertical position of the gap 23.
The vertical width W5 (see FIG. 2) of the user support member 80 is wider than the vertical width W2 of the gap 23 (see FIGS. 3 and 5).

  The user support member 85 is disposed below the user support member 85. One end of the user support member 85 is attached to the attachment portion 86 by being hooked on the attachment portion 86. The attachment portion 86 is formed so as to protrude from the left inner surface of the side plate 41. The other end of the user support member 85 is attached to the attachment portion 87 by being hooked on the attachment portion 87. The attachment portion 87 is welded to the side column 24. In this manner, the user support member 85 is provided so as to be bridged from side to side from the mounting portion 86 to the mounting portion 87.

  User support members 80 and 85 are disposed on the back side of the pad, and the pad is supported by the user support members 80 and 85. When the user sitting on the seat 1 leans his / her upper body against the backrest 4, the upper body of the user is supported by the user support members 80 and 85. At this time, the pad is pushed backward by the upper body of the user, and the user support members 80 and 85 are also deformed so as to be pushed and extended backward by the pad.

  As shown in FIGS. 1 and 2, an airbag module 95 is attached to the right side surface of the side plate 41. Specifically, as shown in FIG. 6, a fastener such as a bolt, a screw, or a screw is provided so as to penetrate the fixing portion 57 of the side plate 41, and the airbag module 95 is fastened to the side plate 41 by the fastener. Is done. The position of the fixing portion 57 is lower than the position of the gap 23.

  The airbag module 95 includes at least an inflator and an airbag, and a retainer, a lid, an impact sensor, a control circuit, and the like are incorporated in the airbag module 95 as necessary. When the impact of the vehicle is detected by the impact sensor, a signal from the impact sensor is input to the inflator via the control circuit, the inflator is ignited by the signal, and the airbag is instantly inflated by the gas generated from the inflator.

According to the present embodiment, the following effects are produced.
(1) Since the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is disposed above the user support member 80, the gap 23 is the upper upper end of the skeleton member 20. It will be arranged near the beam 25. Therefore, even when a large load is applied to the backrest 4 from the front of the backrest 4, the moment around the gap 23 can be reduced. Therefore, the deformation amount of the frame 10 and the skeleton member 20 can be suppressed.

(2) The load applied to the backrest 4 from the front of the backrest 4 is received by the user support members 80 and 85. Therefore, the load applied to the upper part of the skeleton member 20 can be reduced by the user support members 80 and 85. Therefore, the deformation amount of the frame 10 and the skeleton member 20 can be suppressed.

(3) Since the gap 23 is disposed above the fixing portion 57 of the airbag module 95 by the fastener, the portion where the side lower column 31 contacts the side frame 40 is disposed near the fixing portion 57. Become. Therefore, the fixing portion 57 of the airbag module 95 by the fastener can be reinforced by the skeleton member 20, and the rigidity of the side frame 40 at the fixing portion 57 can be ensured.

(4) The side upper column 27 is fixed to the side frame 40 by the welded portions 55 and 56 so that the side upper column 27 is sandwiched forward and backward by the side frame 40 above the gap 23. Since the connecting portion (welded portion 62) between the support column 27 and the upper member 60 is aligned in the vertical direction, the linkability between the side frame 40 and the upper member 60 is enhanced. Therefore, reinforcement of the skeleton member 20 by the side frame 40 and the upper member 60 is effective, and deformation of the skeleton member 20 can be suppressed.

(5) The vertical width W2 of the gap 23 is narrower than the vertical width W1 of the upper member 60, and the distance over which the side frame 40 straddles the gap 23 is short. Therefore, reinforcement of the skeleton member 20 by the side frame 40 becomes more effective. Therefore, deformation of the skeleton member 20 can be suppressed.

(6) Since the vertical width W5 of the user support member 80 is wider than the vertical width W2 of the gap 23, the stability of the user support by the user support member 80 is improved.

(7) Since the vertical width W2 of the gap 23 is narrower than the vertical width W5 of the user support member 80, the moment due to the load from the front can be reduced. Therefore, the deformation amount of the skeleton member 20 can be suppressed.

(8) The skeleton member 20 is fixed to the side frame 40 by welds 47, 48, 52, 53 in the vicinity of the gap 23. Therefore, the reinforcement of the skeleton member 20 by the side frame 40 becomes more effective. Therefore, deformation of the skeleton member 20 can be suppressed.

(9) The portion 49 between the hole 45 and the hole 46 is aligned with the gap 23 in the vertical direction, and the portion 49 is attached to the gap 23 from the side. Can be suppressed. The same applies to the portion 54 between the hole 50 and the hole 51.

(10) The side upper column 27 protrudes below the lower edge of the holes 45 and 50, and the holes 45 and 50 do not face the gap 23. Similarly, the holes 46 and 51 do not face the gap 23. Therefore, the range in which the portion 49 between the hole 45 and the hole 46 and the portion 54 between the hole 50 and the hole 51 attach the gap 23 from the side is widened. Therefore, deformation of the skeleton member 20 can be suppressed.

  Embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention. Hereinafter, some modified examples will be described. The modifications described below are the same as those in the above-described embodiment except for the changes. Moreover, you may combine each modification demonstrated below as much as possible.

[Modification 1]
In the above-described embodiment, the frame shape of the skeleton member 20 is rectangular. On the other hand, the frame shape of the skeleton member 20 may be other than a rectangular shape.

[Modification 2]
FIG. 7 is a cross-sectional view of the VV plane according to the second modification. As shown in FIG. 7, the side upper column 27 does not protrude downward from the lower edge of the hole 45, and the lower end 21 of the side upper column 27 is disposed above the lower edge of the hole 45. The side lower column 31 does not protrude upward from the upper edge of the hole 46, and the upper end 22 of the side lower column 31 is disposed below the upper edge of the hole 46. The interval W2 between the gaps 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower than the interval W3 between the hole 45 and the hole 46. Therefore, the upper and lower ranges of the welded portions 47 and 48 can be expanded, and the bonding strength between the side frame 40 and the skeleton member 20 by the welded portions 47 and 48 is improved.

  The side upper column 27 does not protrude downward from the lower edge of the hole 50, and the lower end 21 of the side upper column 27 is disposed above the lower edge of the hole 50. The side lower column 31 does not protrude upward from the upper edge of the hole 51, and the upper end 22 of the side lower column 31 is disposed below the upper edge of the hole 51. The interval W2 between the gaps 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower than the interval W4 between the hole 50 and the hole 51. Therefore, the upper and lower ranges of the welded parts 52 and 53 can be expanded, and the joint strength between the side frame 40 and the skeleton member 20 by the welded parts 52 and 53 is improved.

[Modification 3]
FIG. 8 is a cross-sectional view of the VV plane according to the third modification. As shown in FIG. 8, the side upper column 27 does not protrude from the lower edge of the hole 45, and the lower end 21 of the side upper column 27 is disposed above the lower edge of the hole 45. The side lower column 31 protrudes upward from the upper edge of the hole 46.
The interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower or wider than the interval W3 between the hole 45 and the hole 46. Alternatively, the interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is equal to the interval W3 between the hole 45 and the hole 46.

The side upper column 27 does not protrude downward from the lower edge of the hole 50, and the lower end 21 of the side upper column 27 is disposed above the lower edge of the hole 50. The side lower column 31 protrudes upward from the upper edge of the hole 51.
The interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower or wider than the interval W4 between the hole 50 and the hole 51. Alternatively, the interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is equal to the interval W4 between the hole 50 and the hole 51.

[Modification 4]
FIG. 9 is a cross-sectional view of the VV plane according to the fourth modification. As shown in FIG. 9, the side upper column 27 protrudes downward from the lower edge of the hole 45. The side lower column 31 does not protrude upward from the upper edge of the hole 46, and the upper end 22 of the side lower column 31 is disposed below the upper edge of the hole 46.
The interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower or wider than the interval W3 between the hole 45 and the hole 46. Alternatively, the interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is equal to the interval W3 between the hole 45 and the hole 46.

The side upper column 27 protrudes downward from the lower edge of the hole 50. The side lower column 31 does not protrude upward from the upper edge of the hole 51, and the upper end 22 of the side lower column 31 is disposed below the upper edge of the hole 51.
The interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is narrower or wider than the interval W4 between the hole 50 and the hole 51. Alternatively, the interval W2 of the gap 23 between the lower end 21 of the side upper column 27 and the upper end 22 of the side lower column 31 is equal to the interval W4 between the hole 50 and the hole 51.

[Modification 5]
The structure of the sheet 1 described above is reversed left and right. That is, a sheet having a mirror image relationship with the sheet 1 described above is also disclosed in this specification as an embodiment of the present invention.

[Modification 6]
In the above-described embodiment, the attachment portions 81 and 86 are formed on the side frame 40. On the other hand, the attachment portions 81 and 86 may be attached to the lower side support column 31 in the same manner as the attachment portions 82 and 87 are attached to the side support column 24.

4 Backrest 10 Frame 20 Frame member 21 Lower end of side upper column (one end of bar)
22 Upper end of side lower support (other end of bar)
23 Gap 27 Side upper support (side part of skeleton member)
31 Side lower support (side part of skeleton member)
40 Side frame 45, 50 holes (first hole)
46,51 holes (second hole)
60 Upper member (reinforcing member)
80 User support member 95 Airbag module

Claims (8)

A skeletal member obtained by bending a bar in a frame shape as seen from the front;
A side frame attached to a side portion of the skeleton member;
A user support member provided on the left and right inside the skeleton member, and
One end of the bar is separated from the other end of the bar to face the other end of the bar, and a gap between the one end and the other end of the bar is formed on the side of the skeleton member. The side frame is attached to the side portion of the skeleton member so as to straddle the gap, and the gap is disposed above the user support member.
Backrest frame. An airbag module fixed to the side frame by a fastener;
The gap is disposed above a fixing portion where the fastener fixes the airbag module to the side frame.
The frame of the backrest according to claim 1. A reinforcing member provided between a side portion of the skeleton member and a side portion on the opposite side;
The side part of the skeletal member is fixed to the side frame so that the side part is sandwiched between the side frames above and behind the gap, and the vertical position of the fixing part is the side part of the skeleton member and the reinforcing member Aligned with the vertical position of the connecting part,
The frame of the backrest according to claim 1 or 2. The vertical width of the gap is narrower than the vertical width of the reinforcing member,
The backrest frame according to claim 3. The user support member is a spring bent into a wave shape with the vertical direction as the amplitude direction,
The vertical width of the gap is narrower than the vertical width of the user support member,
The backrest frame according to any one of claims 1 to 4. A first hole formed in the side frame;
A second hole formed in the side frame apart from the first hole, and
Of the side part of the skeleton member, the part above the one end of the bar is in contact with the side frame so as to block the first hole, and the side part of the skeleton member and the side along the first hole The side frames are welded,
Of the side part of the skeleton member, a part below the other end of the bar is in contact with the side frame so as to block the second hole, and along the second hole, the side part of the skeleton member And the side frame is welded,
The portion between the first hole and the second hole in the side frame has the gap and the vertical position aligned.
The backrest frame according to any one of claims 1 to 5. One end of the bar protrudes below the lower edge of the first hole,
The backrest frame according to claim 6. The other end of the bar protrudes above the upper edge of the second hole,
The frame of the backrest according to claim 6 or 7.

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