JPH0759962A - Seat-back cover mounting structure on seat-back main body - Google Patents

Abstract

PURPOSE:To maintain excellent appearance quality even when an error is made in the manufacture of a seat-back pad. CONSTITUTION:Suspension cotton cloth 40 for inserting a fasten rubber 44 is sewn in the back face of a seatback cover 3. A cut-out section 42 having a specified cut-out width is formed at the intermediate section in the longer direction of the suspension cotton cloth 40, a linking ring 50 attached to the intermediate section of the fasten rubber 44 in the longer direction is disposed therein in a state that it is projected out of the cut-out section. Therefore, even if an error is made in the manufacture of a seat-back pad, provided that the error is in a range of the cut-out width, the movement of the fasten rubber 44 allows the linking ring 50 to be moved. That is, the error in manufacture can thereby be absorbed. Therefore, excellent appearance quality can thereby be maintained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat back cover mounting structure for covering the surface of a seat back body.

[0002]

2. Description of the Related Art Conventionally, a seat back having a concave backrest has been used in order to improve the seating feeling of an occupant. When adopting such a seat back, it is necessary to fit the seat back cover to the concave shape of the seat back pad. As one of the means, there is a structure in which a part of the seat back cover is suspended in a groove provided in the seat back pad by using a fastener rubber (for example, see Japanese Utility Model Laid-Open No. 3-42300). Hereinafter, this structure will be described.

In FIG. 9, a seat back pad 200 having a predetermined concave shape and a seat back cover 202 which covers the surface of the seat back pad 200 are shown in a separated state. The backrest of the seat back pad 200 is provided with vertical grooves 204 formed in parallel with each other and horizontal grooves 206 connecting the vertical grooves 204 at predetermined locations.

On the other hand, the seat back cover 202 has a bag shape, and hanging members (fastener rubbers) 208 are attached to the back surface of the seat back cover 202 along the longitudinal grooves 204. Locking members 210 and 212 are attached to the upper and lower ends and the intermediate portion of each hanging member 208. In addition, the locking member 212 in the middle portion is used for the seat back pad 2
00 lateral groove 2 formed in the center of the backrest
This corresponds to the position where 06 and the vertical groove 204 intersect.

To attach the seat back cover 202 to the surface of the seat back pad 200, as shown in FIG.
As shown in FIG.
0 is a locking piece 216 at the upper end of the seat back frame 214
Then, while pulling the suspension member 208, the next locking member 212 is locked to the seat spring 218,
Finally, attach the locking member 210 at the lower end to the seat back frame 2
The locking piece 216 at the lower end of 14 may be locked. As a result, the elastic force of the suspension member 208 causes the seat back cover 2 to move.
By acting on 02, the seat back cover 202 is suspended in the longitudinal groove 204 and the lateral groove 206 of the seat back pad 200. As a result, as shown in FIG. 11, the seat back cover 202 fitted to the concave shape of the seat back pad 200 is obtained, and the vertical trimming groove 220 and the lateral trimming groove 220 along the concave grooves 204 and 206 are obtained. A trimming groove 222 in the direction is formed, which produces a design effect.

[0006]

By the way, since the seat back pad 200 is generally manufactured by resin molding,
Manufacturing error is relatively easy to occur. In this case, the manufacturing error also affects the concave shape of the seat back pad 200, the vertical groove 204, and the horizontal groove 206.

Therefore, if the above structure is adopted, not only the upper and lower locking members 210 but also the intermediate locking member 212.
Also, since the suspension member 208 is also fixed to the hanging member 208, the locking member 212 in the middle portion has the vertical groove 204 and the horizontal groove 206.
It may deviate from the crossing point with. In this case, since the engaging member 212 in the middle portion is forced to engage with the seat spring 218, a portion excessively pulled by the suspending member 208 or a portion having insufficient pulling force is generated. Therefore, the seat back cover 202 cannot be suspended in the concave grooves 204 and 206 with a uniform elastic force. As a result, the seat back cover fitted to the concave shape of the seat back pad 200 cannot be attached, and the appearance quality of the seat back deteriorates.

In view of the above facts, it is an object of the present invention to obtain a structure for mounting a seat back cover to a seat back body which can maintain a good appearance quality even when a manufacturing error occurs in the seat back pad.

[0009]

According to a first aspect of the present invention, there is provided a structure for mounting a seat back cover to a seat back main body, comprising a seat back main body having a seat back pad having a concave backrest portion, and a seat. A recessed groove is provided on the front surface of the back pad along the height direction of the seat back body, a seat back cover that covers the surface of the seat back body, and a recessed groove is provided on the back surface of the seat back cover along the recessed groove. A suspending portion which is formed in a bag shape that can be suspended in the recessed groove, and has a notch portion which is notched at a predetermined notch width in a longitudinally intermediate portion, and a rubber member which is inserted into the suspending portion. A vertical locking member provided on the upper and lower portions of the rubber member and locked to the upper and lower portions of the seat back body, and a notch attached to the longitudinal intermediate portion of the rubber member. A relay locking device is arranged in a projecting state, to be engaged in the height direction intermediate portion of the seat back body from
It is characterized by having.

According to a second aspect of the present invention, there is provided a structure for mounting a seat back cover to a seat back main body, comprising a seat back main body having a seat back pad having a concave backrest, and a seat on the front surface of the seat back pad. A recess groove provided along the height direction of the back body, a seat back cover that covers the front surface of the seat back body, and a recess provided on the back surface of the seat back cover along the recess groove and suspended in the recess groove. A suspending portion which is formed in a possible bag shape and has a notch portion which is notched with a predetermined notch width in a longitudinally intermediate portion, a rubber member which is inserted into the suspending portion, and an upper portion of the rubber member. And a vertical locking member provided on the lower part and locked on the upper and lower parts of the seatback body,
A relay locking member that is provided at a middle portion in the longitudinal direction of the rubber member so as to be relatively movable, is arranged in a protruding state from the cutout portion, and is locked to a middle portion in the height direction of the seatback body. There is.

[0011]

According to the present invention described in claims 1 and 2,
A relay lock provided on the upper and lower portions of the rubber member to lock the upper and lower locks to the upper and lower portions of the seat back body, and fixed or relatively movable on the intermediate portion in the longitudinal direction of the rubber member. To the middle portion of the seat back body in the height direction. Since this rubber member is inserted into the bag-shaped suspending portion provided on the back surface of the seat back cover, the suspending portion is suspended in the groove provided on the front surface of the seat back pad by the elastic force of the rubber member. Get caught.
As a result, the seat back cover is attached to the seat back body, and the surface of the seat back body is covered with the seat back cover.

Here, the back portion of the seat back pad described above has a concave shape, but since it is manufactured by resin molding, there are relatively manufacturing errors, and variations in the concave shape, the groove shape, etc. are likely to occur.

However, according to the first aspect of the present invention, a cutout portion having a predetermined cutout width is provided in the longitudinal intermediate portion of the suspending portion, and the longitudinal intermediate portion of the rubber member is provided. The fixed relay lock can be moved within the cutout width of the cutout by moving the rubber member. Therefore, if there is variation (manufacturing error) in the concave shape, etc., you can move the relay locking tool within the notch width of the notch by pulling the rubber member, etc. Even if there is, the elastic force of the rubber member can be uniformly applied to the hanging portion. That is, the manufacturing error of the seat back pad can be absorbed. For this reason,
The hanging portion can be sufficiently hung in the groove, and the seat back cover can be attached to the seat back main body in a state of being fitted to the concave shape of the seat back pad. As a result, a good appearance quality of the seat back can be maintained.

According to the present invention as set forth in claim 1, the rubber member can be moved only within the range of the cutout width of the cutout portion. However, according to the present invention as set forth in claim 2, the relay locking device is provided. Is provided at the middle portion of the rubber member in the longitudinal direction so that the rubber member can be freely moved without being affected by the relationship between the relay engaging member and the notch. It should be noted that the magnitude of the load when the operator pulls the rubber member is not affected. Therefore, as compared with the case of the present invention according to claim 1, the performance of absorbing the manufacturing error such as the concave shape of the seat back pad is better, and the performance of suspending the suspending portion in the recess is improved. As a result, in the present invention according to claim 2, a further excellent appearance quality of the seat back can be obtained.

Further, in both the present invention of claim 1 and the present invention of claim 2, the shape of the cutout portion and the shape of the relay engaging member are changed so that the concave shape of the seat back pad is restricted. Thus, it is possible to adjust the concave feeling of the seat back cover.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. [Structure of Seat Back Frame 12] The seat back 10 is shown in FIG. The seat back 10 includes a rectangular frame-shaped seat back frame 12 serving as a skeletal member. The seat back frame 12 is the seat back 1
The upper frame 14 disposed inside the upper end portion of 0 and formed by bending both end portions of the pipe downward, and the both end portions of the pipe disposed inside the lower end portion of the seatback 10 are bent slightly obliquely upward. The lower frame 16 is formed, and a pair of side frames 18 are fixed to both ends of the upper frame 14 and both ends of the lower frame 16, respectively, and connect the both.

A pair of cylindrical headrest stays 54 are fixed to the axially intermediate portion of the upper frame 14. An upper end portion of a headrest stay cover 56 is fixed to a peripheral surface of a lower end portion of each headrest stay 54. On the other hand, both ends of the headrest cover attaching wire 58 are fixed to both bent ends of the upper frame 14, and an arcuate portion of the lower end of the headrest cover 56 is fixed to an intermediate portion of the headrest cover attaching wire 58. . [Structure of Seat Spring 20] Between the pair of side frames 18 of the seat back frame 12, a seat spring 20 bent in an S-shape in three steps in the height direction of the seat back 10 is stretched. [Structure of Upper Shaped Wire 22] Further, the upper shaped wires 22 are provided at both bent ends of the upper frame 14. Each upper-shaped wire 22 is bent at a substantially right angle in a plan view, one end is bent toward the vehicle rear side, and the other end is bent toward the vehicle lower side, and then diagonally rearward toward the vehicle. It is formed by bending, and the upper frame 1
4 is welded to the bent end. [Configuration of Lower Shaped Wire 26] On the other hand, the lower frame 16 is provided with the lower shaped wire 26.
The lower-shaped wire 26 is disposed below the lower frame 16 and is spaced apart from and parallel to the lower frame 16.
6A, a relay portion 26B formed by projecting the axis lines of both ends of the waist portion support portion 26A into a substantially rectangular shape so as to project forward and slightly obliquely downward, and a rear end portion inside the relay portion 26B. And a mounting portion 26C formed by being bent rearward and obliquely upward.

Of these, the mounting portion 26C is the lower frame 16
The lower shaped wire 26 is attached to the lower frame 16 by being welded near both ends of the lower frame 16. Further, the lower back support portion 26A corresponds to the lower back portion of the occupant sitting on the seat cushion. Further, the relay section 26B
Protrudes to near the bottom surface of the lower end portion of the recessed groove 36 of the seat back pad 28 described later (see FIG. 5). [Structure of Seat Back Pad 28] FIG. 2 is an external perspective view of the seat back pad 28. Inside the seat back pad 28, internal components such as the seat back frame 12 described above are embedded. That is, in this embodiment, by first assembling these internal components and then foaming urethane,
The seat back pad 28 is formed integrally with the internal components. However, it is not always necessary to have such a configuration, and the seat back pad may be separately manufactured and then assembled to the seat back frame 12.

The seat back pad 28 described above includes a backrest portion 30 for supporting the back surface of an occupant seated on a seat cushion, and side support portions 32 integrally provided on both sides of the backrest portion 30 for supporting the occupant side portions. A shoulder support portion 34 that protrudes from both upper sides of the backrest portion 30 toward the outer side in the width direction of the seat back 10 and is continuously provided on the upper end portion of the side support portion 32 to support the shoulders of the occupant.

Explaining the backrest portion 30 further, the lower front surface that supports the occupant's waist is a convex curved surface 30A, and the intermediate front surface that supports the occupant's back middle portion is a concave curved surface 30B. The upper front surface that supports the upper rear surface is a convex curved surface 30C that is gentler than the convex curved surface 30A. [Structure of Recessed Groove 36] A recessed groove 36 having a predetermined depth is formed in a parting portion between the backrest portion 30, the side support portion 32, and the shoulder support portion 34 in the seat back pad 28 described above. The formation range of the groove 36 is from the upper end position of the front surface of the seat back pad 28 to the lower end position of the rear surface around the lower end position of the front surface. The cross section of the groove 36 at a right angle to the longitudinal direction is trapezoidal,
Recesses 36A and 36B are integrally formed near the upper end of the bottom surface and in the middle. The upper recess 36A is formed at a position overlapping the upper end of the upper shaping wire 22 when viewed from the front side of the seat back 10, and the upper end of the upper shaping wire 22 extends from the bottom of the recess 36A. Partly exposed. Further, the lower recess 36B is formed at a position that overlaps with a predetermined portion of the seat spring 20 arranged in the upper stage when viewed from the front side of the seat back 10, and the bottom of the recess 36B extends from the bottom of the seat spring 2.
Part of 0 is exposed. [Structure of Seat Back Cover 38] As shown in FIG. 3, the seat back cover 38 is covered on the surface of the seat back pad 28 described above. The seat back cover 38 includes a backrest covering portion 38A that covers the front and back surfaces of the backrest portion 30 of the seatback pad 28, and a side support covering portion 38B that covers the side support portion 32.
And a shoulder support coating portion 38C that covers the shoulder support portion 34, and is sewn as a whole by sewing the side edges of the backrest coating portion 38A and the side edges of the side support coating portion 38B and the shoulder support coating portion 38C. Is formed in.

As shown in FIG. 5, the seat back cover 38 has a front lower end and a rear lower end.
Hooks 60 and 62 are attached, respectively. Therefore, the seat back cover 38 is attached to the seat back pad 28.
After covering the seat back cover 38, the hooks 60 and 62 are locked to each other to close the opening of the seat back cover 38. [Structure Concerning Attachment of Seat Back Cover 38] As shown in FIG. 1, a sewn portion between the side edge of the backrest covering portion 38A of the seat back cover 38 and the side edges of the side support covering portion 38B and the shoulder support covering portion 38C (two A long and bag-shaped hanging cotton cloth 40 is sewn to the (location). A triangular notch 42 is formed at a predetermined position of each hanging cotton cloth 40 (a position corresponding to the lower recess 36B).

On the other hand, inside the hanging cotton cloth 40, a fastener rubber 44 having a circular cross section in the form of a right angle in the longitudinal direction (square or rectangular shape may be used) is inserted. The thickness of the fastener rubber 44 is set so that it can be accommodated in the above-mentioned recessed groove 36 (see FIG. 4).

A rectangular upper ring 46 is attached to the upper end of the fastener rubber 44. Further, a spherical knuckle portion 48 having a diameter larger than the diameter dimension of the fastener rubber 44 is integrally formed at a position where the fastener rubber 44 is returned from the lower end portion by a predetermined length. The portion from the knot portion 48 to the lower end portion is a portion that is gripped by a worker during a pulling operation (hereinafter, referred to as “grasping portion 44A”).

Further, in the middle portion of the fastener rubber 44,
An elliptical relay ring 50 is attached. The attachment portion of the relay ring 50 is located at a position corresponding to the cutout 42 of the hanging cotton cloth 40 in the fastening rubber 44. Therefore, the relay ring 50 is arranged so as to project from the notch 42.

Of these, the upper end ring 46 is locked to the upper end portion of the upper shaping wire 22 by a C-shaped hog ring 52 via the recess 36A on the upper side of the seat back pad 28. Further, the relay ring 50 is locked by a hog ring 52 of the same shape to the upper seat spring 20 via the recess 36B on the lower side of the seat back pad 28. Further, the knuckle portion 48 is locked by a hog ring 52 of the same shape to the end portion of the relay portion 26B of the lower shape drawing wire 26 on the side opposite to the protruding direction.

More specifically, a method of fixing the lower portion of the fastening rubber 44 including the grip portion 44A and the joint portion 48 will be described in detail. The fastening rubber 44 is closely attached to the end portion of the relay portion 26B on the side opposite to the protruding direction. At a position adjacent to the joint 48, the hog ring 52 is engaged. In the locked state, the node 48 is hooked on the hog ring 52, so that the fastener rubber 44 does not contract. Thereby, the hanging cotton cloth 40 and the seat back cover 38 in the vicinity thereof are suspended in the recessed groove 36 by the elastic force of the fastener rubber 44, and the seat back cover 38 is
A predetermined tension is applied to. In addition, the lower ends of the pair of fastener rubbers 44 are wrapped by the intermediate portion in the longitudinal direction of the main part supporting portion 26A of the lower shaped wire 26, and are stopped by the hog ring 52 in this state.

Here, as enlargedly shown in FIGS. 6 and 7, the relay ring 50 is fixedly attached to the middle portion in the longitudinal direction of the fastener rubber 44 (see FIG. 7). The relay ring 50 in the state is notched 42
Since it is arranged so as to project from the relay rubber 50, the relay ring 50 is moved to the notch 42 by moving the fastener rubber 44.
It is movable with the fastener rubber 44 within the range of the notch width B (see FIG. 6).

The operation of this embodiment will be described below through the procedure for attaching the seat back cover 38.

A seat back body in which the seat back pad 28 is integrally provided in advance in the internal components such as the seat back frame 12, the hanging cotton cloth 40, and the fastening rubber 4
The seat back cover 38 to which 4 and the like are attached and the seat back cover 38 are separately assembled.

First, the bag-shaped seat back cover 38 is turned upside down. Next, the upper end ring 46 of the fastener rubber 44 is locked to the upper end portion of the upper shaping wire 22 by the hog ring 52 in the recess 36A above the recessed groove 36. Next, the relay ring 5 of the fastener rubber 44
0 is locked by the hog ring 52 at a predetermined portion of the upper seat spring 20 in the recess 36B below the recess groove 36. This operation is carried out while accommodating the fastener rubber 44 from the upper end ring 46 to the relay ring 50 in the groove 36.

Next, while the fastener rubber 44 extending from the relay ring 50 to the joint portion 48 is accommodated in the recessed groove 36, the joint portion 48 forms the joint portion 26B of the lower shaped wire 26.
The hog ring 52 is engaged with the end of the side opposite to the protruding direction. As a result, the fastener rubber 44 is wound around the lower end of the seat back pad 28 and the end of the lower portion forming wire 26 on the protruding side of the relay portion 26B. Note that this operation is performed while the operator grips the grip portion 44A of the fastening rubber 44 and pulls the grip portion 44A. Further, by going through this process, the hanging cotton cloth 40 and the seat back cover 38 in the vicinity thereof are hung deeper into the concave groove 36, and a deep hanging feeling can be obtained, and the concave shape of the seat back pad 28 is fitted. The seated state of the seat back cover 38 can be obtained.

After that, the lower ends of the pair of fastener rubbers 44 are wrapped around the middle portion in the longitudinal direction of the waist supporting portion 26A of the lower shaping wire 26, and both lower ends are stopped by the hog ring 52 in this state. Then, finally, the hook 60 of the terminal at the lower end of the front side of the seat back cover 38 and the hook 62 of the terminal at the lower end of the rear side are locked to each other. This allows
The work of attaching the seat back cover 38 is completed.

Here, in the present embodiment, the relay ring 50 is fixedly attached to the middle portion in the longitudinal direction of the fastener rubber 44 inserted into the hanging cotton cloth 40, and the notch 42 having the predetermined notch width B is formed in the hanging cotton cloth 40. Since the relay ring 50 is provided so as to project from the notch 42, even if there is a manufacturing error in the uneven shape of the seat back pad 28 after molding, the fastener rubber 44 is moved within the range of the notch width B. By doing so, the position of the relay ring 50 can be changed. Therefore, the manufacturing error of the seat back pad 28 can be absorbed. Therefore, even if a slight manufacturing error occurs in the seat back pad 28, the hanging cotton cloth 40 can be hung in the concave groove 36 with a uniform elastic force, and the seat back cover 38 can be mounted in a good state. Therefore,
Coupled with the deep hanging feeling of the seat back cover 38, the appearance quality of the seat back 10 can be favorably maintained.

Further, according to this embodiment, there is an effect that the concave feeling of the seat back cover 38 can be easily adjusted by changing the shape of the notch 42 and the shape of the relay ring 50.

Although the relay ring 50 is fixedly attached to the fastener rubber 44 in this embodiment, the present invention is not limited to this, and the relay ring 50 may be inserted into the fastener rubber 44 as shown in FIG. Good. In this case, since the relay ring 50 is movable relative to the fastener rubber 44, the fastener rubber 44 can be moved regardless of the cutout width of the cutout 42. Therefore, the performance of absorbing the manufacturing error of the seat back pad 28 is further improved. Further, it is not affected by the magnitude of the load when the operator pulls the fastener rubber 44.

In this embodiment, the hanging cotton cloth 40 is formed separately from the backrest covering portion 38A and the side support covering portion 38B of the seat back cover 38, but the present invention is not limited to this, and the backrest covering portion 38A or the side support covering portion is not limited thereto. Three
The hanging cotton cloth may be formed by folding back the edge of 8B into a bag shape.

[0037]

As described above, the mounting structure of the seat back cover to the seat back body according to the present invention according to claims 1 and 2 has a bag-like shape along the concave groove on the back surface of the seat back cover. While forming the hanging part, a notch part cut out with a predetermined notch width is provided in the middle part in the longitudinal direction of the hanging part, and the relay locking device arranged in a protruding state from the notch part is hung up. Since it is fixed to the intermediate portion in the longitudinal direction of the rubber member inserted in the portion or is provided so as to be relatively movable,
It has an excellent effect that good appearance quality can be maintained even if a manufacturing error occurs in the seat back pad.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mounting structure of a seat back cover to a seat back body in a seat back according to an embodiment.

FIG. 2 is an external perspective view showing the seat back pad of FIG.

FIG. 3 is a perspective view showing a seat back frame and the like which are internal components of the seat back shown in FIG.

4 is an end view taken along line 4-4 of FIG.

5 is an end view taken along line 5-5 of FIG.

FIG. 6 is an enlarged view of a main part showing a cutout formed in a hanging cotton cloth and a relay ring and the like arranged in a protruding state from the cutout.

FIG. 7 is an enlarged view of a main part showing a state where the relay ring shown in FIG. 6 is attached to the fastener rubber.

8 is an enlarged view of a main part corresponding to FIG. 7, showing a modified example of how to attach the relay ring shown in FIG. 7 to the fastener rubber.

FIG. 9 is a perspective view showing a mounting structure of a seat back cover to a seat back body according to a conventional example.

10 is a view showing a state in which the seat back cover shown in FIG. 9 is attached to the seat back body, FIG.
FIG. 10 is a sectional view taken along line 10.

FIG. 11 is an external perspective view showing a state in which the seat back cover is likewise attached to the seat back main body.

[Explanation of symbols]

 12 seat back frame (seat back main body) 28 seat back pad (seat back main body) 30 backrest part 36 concave groove 38 seat back cover 40 hanging cotton cloth (suspending part) 42 notch 44 fastener rubber (rubber member) 46 upper end ring (upper and lower engaging) Stoppers) 48 Knots (upper and lower locks) 50 Relay ring (relay locks)

Claims (2)

[Claims] 1. A seat back body having a seat back pad whose back portion has a concave shape, a groove provided on the front surface of the seat back pad along the height direction of the seat back body, and a seat back body of the seat back body. A seat back cover that covers the front surface, and a bag-like shape that is provided along the groove on the back surface of the seat back cover and that can be hung in the groove,
Also, a suspending portion having a notch portion cut out at a predetermined notch width in the longitudinal middle portion, a rubber member inserted into the suspending portion, and a seat back provided on the upper and lower portions of the rubber member. A vertical locking device that is locked to the upper and lower parts of the main body, and is fixed to the middle part in the longitudinal direction of the rubber member and is arranged so as to project from the cutout part, and is locked to the middle part in the height direction of the seat back body. A structure for attaching a seat back cover to a seat back main body, comprising: 2. A seat back main body having a seat back pad whose back portion has a concave shape, a recessed groove provided on the front surface of the seat back pad along the height direction of the seat back main body, and a seat back main body of the seat back main body. A seat back cover that covers the front surface, and a bag-like shape that is provided along the groove on the back surface of the seat back cover and that can be hung in the groove,
Also, a suspending portion having a notch portion cut out at a predetermined notch width in the longitudinal middle portion, a rubber member inserted into the suspending portion, and a seat back provided on the upper and lower portions of the rubber member. An upper and lower locking device that is locked to the upper and lower parts of the main body, and is provided so as to be movable relative to the longitudinal middle portion of the rubber member, and is arranged so as to project from the cutout portion, and is arranged at the middle portion in the height direction of the seat back body. A structure for mounting a seat back cover to a seat back body, comprising: a relay locking device to be locked.