JP2018127108A - Vehicle seat and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat that is able to easily cope with a pitch change of a stay of a head rest.SOLUTION: One aspect of the present disclosure is a vehicle seat comprising a seat back, a head rest, and a back frame. The back frame forms a skeleton for the seat back. The head rest has a head rest body and a stay. The stay supports the head rest body and both ends thereof project further toward the back frame than a head rest body. The back frame has a plurality of wires, a pair of cylindrical support brackets, and a pair of reinforcement plates. The plurality of wires extend in a lateral direction of the seat and are arranged one above the other in a vertical direction. Into the pair of support brackets, both ends of the stay are inserted. The pair of reinforcement plates are respectively arranged between the pair of support brackets and the plurality of wires. The plurality of wires are welded to one face of each of the pair of the reinforcement plates and the corresponding one support bracket is welded to the other face thereof.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a vehicle seat.

  In a vehicle seat such as a vehicle, a support bracket for supporting a headrest is attached to a back frame constituting a skeleton of a seat back. Both ends of the U-shaped stay of the headrest are inserted into the support bracket.

  The support bracket is welded to the upper pipe of the back frame, as disclosed in Patent Document 1, for example. In patent document 1, in order to ensure the welding strength of a support bracket and an upper pipe, while a reinforcement board is applied to a support bracket and an upper pipe, the contact surface with the support bracket of an upper pipe is crushed and planarized.

Japanese Patent Laying-Open No. 2005-153630

  The pitch of the stay in the headrest (that is, the distance between both ends of the stay) may vary depending on the design of the vehicle seat. When the stay pitch changes, it is necessary to change the mounting position of the support bracket. However, in the conventional structure, it is necessary to change the position of the flattened portion of the upper pipe in accordance with the mounting position of the support bracket, and there is an inconvenience that the shape of the upper pipe changes every time the stay pitch is changed.

  One aspect of the present disclosure is to provide a vehicle seat that can easily cope with a change in the pitch of a stay of a headrest.

  One aspect of the present disclosure is a vehicle seat including a seat back, a headrest, and a back frame. The back frame constitutes the skeleton of the seat back. The headrest has a headrest body and a stay. The stay supports the headrest body, and both end portions protrude toward the back frame side from the headrest body. The back frame includes a plurality of wires, a pair of cylindrical support brackets, and a pair of reinforcing plates. The plurality of wires extend in the left-right direction of the sheet and are arranged side by side in the up-down direction. Both ends of the stay are inserted into the pair of support brackets. The pair of reinforcing plates are respectively disposed between the pair of support brackets and the plurality of wires. Each of the pair of reinforcing plates has a plurality of wires welded to one surface and a support bracket welded to the other surface.

  According to such a configuration, when the pitch of the stay of the headrest is changed, the position of the pair of support brackets can be changed only by correcting the welding position between the pair of reinforcing plates and the plurality of wires. . That is, the pitch can be changed without changing the shape of the back frame. Therefore, it is possible to easily cope with a change in the pitch of the stay of the headrest while maintaining the fixing strength of the support bracket by the reinforcing plate.

  In one aspect of the present disclosure, the pair of reinforcing plates have the same shape, and may each have a planar shape that is asymmetric in the vertical direction. Moreover, one reinforcement board may be arrange | positioned in the direction rotated 180 degrees, seeing the other reinforcement board from the sheet front-back direction. According to such a configuration, the same shape of the reinforcing plate can be commonly used in the pair of support brackets, and thus the production cost can be reduced. Moreover, by making the planar shape of the left and right reinforcing plates rotationally symmetric, it is possible to prevent the left and right from being erroneously attached to a plurality of wires with respect to the pair of support brackets in which the pair of reinforcing plates are respectively attached.

  In one aspect of the present disclosure, the length of the pair of reinforcing plates in the left-right direction of the seat may be larger than the length of the pair of support brackets in the left-right direction of the seat. In addition, the pair of reinforcing plates has a length of a region located between the pair of support brackets, as viewed from the front-rear direction of the seat, in a region located outside the pair of support brackets in the left-right direction of the seat. It may be larger than the length. According to such a configuration, the amount of protrusion of the reinforcing plate to the outside in the left-right direction of the seat can be reduced from the support bracket, so that the space around the support bracket can be saved while maintaining the fixing strength between the support bracket and the plurality of wires. Can be achieved.

  In one aspect of the present disclosure, the welding direction between the pair of reinforcing plates and the pair of support brackets may be a vertical direction. According to such a configuration, welding can be performed while avoiding the central portion of the support bracket in the width direction. As a result, the occurrence of beads at the center in the width direction of the support bracket is suppressed, so that the quality of the support structure of the headrest can be improved.

  Another aspect of the present disclosure is a method for manufacturing a vehicle seat including a seat back, a headrest, and a back frame. The back frame constitutes the skeleton of the seat back. A vehicle seat manufacturing method includes a step of welding a reinforcing plate to a cylindrical support bracket for inserting a stay of a headrest, and a back frame that extends in the seat left-right direction and is arranged side by side in the up-down direction. Welding a reinforcing plate welded to the support bracket to a plurality of wires.

  According to such a configuration, the position of the support bracket can be changed simply by correcting the welding position between the reinforcing plate welded to the support bracket and the wire. Therefore, it is possible to easily cope with a change in the pitch of the stay of the headrest while maintaining the fixing strength between the support bracket and the back frame by the reinforcing plate.

FIG. 1 is a schematic perspective view of a vehicle seat in the embodiment. FIG. 2 is a schematic partial front view of the back frame in the vehicle seat of FIG. 1. FIG. 3A is a schematic front view showing an attachment state of the headrest to the back frame, and FIG. 3B is a schematic front view showing an attachment state in which the stay pitch is different from that in FIG. 3A. 4A is a schematic perspective view of the attachment structure between the wire and the support bracket in the back frame of FIG. 2, and FIG. 4B is a schematic front view of the attachment structure between the wire and the support bracket in FIG. 4A. 4C is a schematic rear view of the attachment structure of the wire and the support bracket of FIG. 4A.

Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
A vehicle seat 1 shown in FIG. 1 includes a plurality of seat cushions 2, a plurality of seat backs 3 and a plurality of headrests 4 respectively corresponding to the plurality of seat cushions 2.

  Each of the plurality of seat cushions 2 is a part for supporting a seated person's buttocks and the like. Each of the plurality of seat backs 3 is a part for supporting the back of the seated person. Each of the plurality of headrests 4 is a part for supporting the head of the seated person.

  Further, the vehicle seat 1 includes a plurality of cushion frames (not shown) that respectively constitute the skeletons of the plurality of seat cushions 2, and one back frame 5 (see FIG. 2) that constitutes the skeletons of the plurality of seat backs 3. Is provided.

  The vehicle seat 1 of the present embodiment is used as a rear seat for a normal passenger car. In addition, the direction in the following description and each figure means the direction in the state which assembled | attached the vehicle seat 1 to the vehicle (namely, vehicle).

<Headrest>
As shown in FIG. 3A, the headrest 4 includes a headrest body 4A in which a cover is attached to a pad that supports the head of the seated person, and a stay 4B that supports the headrest body 4A.

  The stay 4B is a rod-shaped metal member bent into an inverted U shape, that is, a U shape that is upside down when viewed from the front-rear direction of the seat. Both ends of the stay 4B protrude below the headrest body 4A, that is, toward the back frame 5 side. Both ends of the stay 4B are spaced apart in parallel in the sheet lateral direction, that is, in the sheet width direction.

<Back frame>
The back frame 5 has a structure for supporting the plurality of headrests 4 on the upper end side. This support structure is provided for each headrest 4. As shown in FIG. 2, the back frame 5 has a plurality of wires 5A extending in the left-right direction of the seat and arranged side by side in the up-down direction, and both ends of the stay 4B as a support structure corresponding to one headrest 4. And a pair of reinforcing plates 5C respectively disposed between the pair of support brackets 5B and the plurality of wires 5A.

(Wire)
The plurality of wires 5A are solid round bar-shaped metal members. The back frame 5 is constituted by welding a plurality of wires 5A and a plurality of wires 5D extending in the vertical direction by welding.

(Support bracket)
Each of the pair of support brackets 5B is a rectangular tubular metal member. The central axis direction of the pair of support brackets 5B coincides with the insertion direction of the stay 4B of the headrest 4. Headrest supports (not shown) are respectively attached to the inside of the pair of support brackets 5B. The headrest support has a through hole in the center.

  By inserting each end of the stay 4B into the through hole of the headrest support, both ends of the stay 4B are inserted into the pair of support brackets 5B, and the headrest 4 is supported by the back frame 5.

  The support bracket 5B is formed by bending a plate material into a cylindrical shape and welding the ends. The pair of support brackets 5B is fixed to the plurality of wires 5A by a pair of reinforcing plates 5C described later.

(Reinforcement plate)
Each of the pair of reinforcing plates 5C is a plate-shaped metal member. In each of the pair of reinforcing plates 5C, a plurality of wires 5A are welded to one surface, that is, the rear surface, and one support bracket 5B is welded to the other surface, that is, the front surface.

  As shown in FIGS. 3A and 3B, the pair of reinforcing plates 5C have the same shape. Each of the pair of reinforcing plates 5C has a planar shape that is asymmetric in the vertical direction. Specifically, the planar shape of the pair of reinforcing plates 5C is a substantially trapezoid in which the lengths of opposing sides (that is, the upper base and the lower base) are different. The upper and lower bases extend in the sheet lateral direction. The upper base is shorter than the lower base, and one end of the upper base and the lower base is connected by a side perpendicular to the left-right direction (hereinafter referred to as “vertical side”), and the other end is the seat left-right direction. In addition, they are connected by sides inclined in the vertical direction (hereinafter referred to as “inclined sides”).

  Each of the pair of reinforcing plates 5C has a length in the left-right direction of the seat that is greater than a length (that is, a diameter) in the left-right direction of the pair of support brackets 5B. As shown in FIG. 2, the pair of reinforcing plates 5 </ b> C has a length L <b> 1 between the pair of support brackets 5 </ b> B as viewed from the front-rear direction of the seat, as compared to the pair of support brackets 5 </ b> B. It is larger than the length L2 of the region located outside in the left-right direction. In the present embodiment, the inclined sides of the pair of reinforcing plates 5C are arranged between the pair of support brackets 5B, respectively, and the vertical sides of the pair of reinforcing plates 5C are respectively outside the pair of support brackets 5B. Has been placed. The vertical length of the pair of reinforcing plates 5C is smaller than the vertical length of the pair of support brackets 5B.

  As shown in FIGS. 4A, 4B, and 4C, each of the pair of reinforcing plates 5C includes a first through hole 6 for weight reduction and a second through hole 7 for inserting a pin at the time of positioning. The 1st through-hole 6 and the 2nd through-hole 7 are each arrange | positioned in the area | region located between 1 pair of support brackets 5B of the reinforcement board 5C, ie, the area | region pinched by the inclined side and the lower bottom.

  Of the pair of reinforcing plates 5C, one reinforcing plate is arranged in a direction rotated 180 ° when the other reinforcing plate is viewed from the front-rear direction of the seat. That is, when the left reinforcing plate 5C is rotated 180 ° around the midpoint of the line segment connecting the centers of gravity of the pair of reinforcing plates 5C, the left reinforcing plate 5C completely overlaps with the right reinforcing plate 5C. In the present embodiment, of the pair of reinforcing plates 5C, the right reinforcing plate 5C is arranged in such a direction that the upper base comes to the upper side, and the left reinforcing plate 5C is arranged in such a direction that the lower base comes to the upper side. Yes.

  The welding direction between the pair of reinforcing plates 5C and the pair of support brackets 5B is the vertical direction. That is, a weld line along the vertical direction is formed at the welded portion of the pair of reinforcing plates 5C and the pair of support brackets 5B.

  The welding position between the pair of reinforcing plates 5C and the pair of support brackets 5B is preferably an end portion (that is, a corner portion) in the left-right direction of the seat. By welding the corners in this way, it is possible to improve the quality by suppressing the occurrence of beads in the pair of support brackets 5B.

  In this embodiment, as shown in FIGS. 4A, 4B, and 4C, one wire 5A is welded to each of the upper end and the lower end of one reinforcing plate 5C. In other words, the pitch of the two wires 5A (that is, the distance between the centers) is designed according to the length in the vertical direction of one reinforcing plate 5C.

[1-2. Vehicle seat manufacturing method]
Hereinafter, the manufacturing method of the vehicle seat 1 will be described.
In the vehicle seat manufacturing method, in the first welding step of welding the reinforcing plate 5C to the cylindrical support bracket 5B for inserting the stay 4B of the headrest 4, and in the back frame 5, the seat extends in the left-right direction, And a second welding step of welding the reinforcing plate 5C welded to the support bracket 5B to the plurality of wires 5A arranged side by side in the vertical direction.

<First welding process>
In this step, one reinforcing plate 5C is welded to one surface of one support bracket 5B, and a part in which the reinforcing plate 5C is attached to the support bracket 5B (hereinafter referred to as “support bracket with reinforcing plate”) is obtained. As described above, the welding direction is the vertical direction (that is, the direction of the central axis of the support bracket 5B).

  Moreover, in this process, the support bracket with a reinforcing plate whose upper bottom in the planar shape of the reinforcing plate 5C is on the upper side and the support bracket with a reinforcing plate whose lower bottom in the planar shape of the reinforcing plate 5C are on the upper side are respectively produced. These two types of support brackets with reinforcing plates are combined one by one and used for one seat back 3.

  Here, the reinforcing plate 5C can be formed by punching a plate material using a mold. In addition, the burr | flash by punching generate | occur | produces in the surface on the opposite side to the side which applied the type | mold of the reinforcement board 5C. Therefore, by making this surface a welding surface with the support bracket 5B, it is possible to suppress injuries when welding the reinforcing plate 5C to the plurality of wires 5A. In the present embodiment, the pair of left and right reinforcing plates 5C have the same shape, and one reinforcing plate is disposed in a direction rotated by 180 ° when the other reinforcing plate is viewed from the front-rear direction of the seat. Therefore, in both the left and right reinforcing plates 5C, the surface where burrs are generated can be used as the welding surface with the support bracket 5B.

<Second welding process>
In this step, one support bracket with a reinforcing plate obtained in the first welding step is welded to the plurality of wires 5A. Thereby, the support bracket 5B is fixed to the plurality of wires 5A via the reinforcing plate 5C. This welding operation is performed twice on each seatback 3 in pairs of left and right.

  After fixing the support bracket 5B to the plurality of wires 5A, the headrest 4 is supported by the back frame 5 by inserting both ends of the stay 4B into the pair of support brackets 5B.

[1-3. effect]
According to the embodiment detailed above, the following effects can be obtained.
(1a) The support bracket 5B is fixed to a plurality of wires 5A constituting the back frame 5 via a reinforcing plate 5C. For this reason, when the pitch of the stays 4B of the headrest 4 is changed, for example, from the pitch shown in FIG. 4A to the pitch shown in FIG. The fixed position of 5B can be shifted. The same applies when the pitch is increased from FIG. 4B to FIG. 4A. Therefore, it is possible to easily cope with the pitch change of the stay 4B of the headrest 4 while maintaining the fixing strength of the support bracket 5B by the reinforcing plate 5C.

  (1b) Welding of the support bracket 5B and the reinforcing plate 5C and welding of the reinforcing plate 5C and the plurality of wires 5A can be performed under conditions better than welding the support bracket 5B directly to the plurality of wires 5A. Therefore, the generation of beads is suppressed and the quality is increased. Moreover, in this embodiment, the effort which flat-processes a pipe like the prior art does not arise.

  (1c) Since the pair of reinforcing plates 5C have the same shape, the reinforcing plates 5C having the same shape can be commonly used in the pair of support brackets 5B. Therefore, production cost can be reduced. Further, by making the planar shape of the left and right reinforcing plates 5C rotationally symmetric, the left and right sides are mistakenly attached to the plurality of wires 5A with respect to the pair of support brackets 5B with the pair of reinforcing plates 5C attached thereto. Can be suppressed.

  (1d) In one reinforcing plate 5C, the length L1 of the region located between the pair of support brackets 5B is longer than the length L2 of the region located on the outer side in the seat lateral direction with respect to the pair of support brackets 5B. Therefore, it is possible to reduce the protruding amount of the reinforcing plate 5C to the outside in the left-right direction of the seat relative to the support bracket 5B. As a result, it is possible to save space around the support bracket 5B while maintaining the fixing strength between the support bracket 5B and the plurality of wires 5A.

  (1e) Since the welding direction between one reinforcing plate 5C and the pair of support brackets 5B is the vertical direction, welding can be performed while avoiding the center portion in the width direction of the support bracket 5B. As a result, the occurrence of beads at the center portion in the width direction of the support bracket 5B is suppressed, so that the quality of the support structure of the headrest 4 can be improved.

[2. Other Embodiments]
As mentioned above, although embodiment of this indication was described, it cannot be overemphasized that this indication can take various forms, without being limited to the above-mentioned embodiment.

(2a) In the vehicle seat 1 of the above-described embodiment, the shape of the pair of reinforcing plates 5C described above is an example, and the shape of the reinforcing plates 5C is not limited thereto.
Therefore, the pair of reinforcing plates 5C does not necessarily have the same shape, and may have different shapes on the left and right. Further, even in the case of the same shape, it is not necessary to have a planar shape that is asymmetric in the vertical direction, and it may not be a rotationally symmetric shape.

  Further, the reinforcing plate 5C may not necessarily have a length in the seat left-right direction larger than that of the support bracket 5B as long as the welding length can be secured. On the contrary, part of the reinforcing plate 5C may protrude above or below the support bracket 5B when viewed from the front-rear direction of the seat. Furthermore, the 1st through-hole 6 and the 2nd through-hole 7 are arbitrary structures, and abbreviate | omitting is possible.

  (2b) In the vehicle seat 1 of the above embodiment, the welding direction between the pair of reinforcing plates 5C and the pair of support brackets 5B may not be the vertical direction. However, from the viewpoint of suppressing the bead as described above, the welding direction is preferably the vertical direction.

  (2c) In the vehicle seat 1 of the above embodiment, the number of wires 5A welded to one reinforcing plate 5C is not limited to two. One reinforcing plate 5C may be welded to three or more wires 5A.

  (2d) The vehicle seat 1 of the above embodiment can also be applied to a vehicle seat other than a rear seat seat for a normal passenger car, and a seat used for a vehicle such as a railway vehicle other than an automobile, a ship, and an aircraft.

  (2e) The functions of one component in the above embodiment may be distributed as a plurality of components, or the functions of a plurality of components may be integrated into one component. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2 ... Seat cushion, 3 ... Seat back, 4 ... Headrest,
4A ... headrest body, 4B ... stay, 5 ... back frame, 5A ... wire,
5B ... support bracket, 5C ... reinforcing plate, 5D ... wire, 6 ... first through hole,
7: Second through hole.

Claims (5)

A vehicle seat comprising a seat back, a headrest, and a back frame constituting a skeleton of the seat back,
The headrest is
The headrest body,
While supporting the headrest body, both ends protrude from the headrest body to the back frame side, and stays,
Have
The back frame is
A plurality of wires extending in the left-right direction of the sheet and arranged side by side in the up-down direction;
A pair of cylindrical support brackets into which the both ends of the stay are inserted;
A pair of reinforcing plates respectively disposed between the pair of support brackets and the plurality of wires;
Have
Each of the pair of reinforcing plates is a vehicle seat in which the plurality of wires are welded to one surface and the one support bracket is welded to the other surface. The vehicle seat according to claim 1,
The pair of reinforcing plates have the same shape, each having a planar shape that is asymmetric in the vertical direction,
Of the pair of reinforcing plates, one reinforcing plate is arranged in a direction rotated by 180 ° when the other reinforcing plate is viewed from the front-rear direction of the seat. The vehicle seat according to claim 1 or 2,
Each of the pair of reinforcing plates is longer in the left-right direction of the seat than the pair of support brackets in the left-right direction of the seat, and is positioned between the pair of support brackets as viewed from the front-rear direction of the seat. The vehicle seat, wherein the length of the region to be operated is larger than the length of the region located on the outer side in the left-right direction of the seat with respect to the pair of support brackets. The vehicle seat according to any one of claims 1 to 3,
The vehicle seat, wherein a welding direction between the pair of reinforcing plates and the pair of support brackets is a vertical direction. A vehicle seat manufacturing method comprising a seat back, a headrest, and a back frame constituting a skeleton of the seat back,
Welding a reinforcing plate to a cylindrical support bracket for inserting the stay of the headrest;
In the back frame, a step of welding a reinforcing plate welded to the support bracket to a plurality of wires extending in the left-right direction of the seat and arranged in the vertical direction;
A method for manufacturing a vehicle seat.

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