JP2012206701A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat for a vehicle, in which an edge of a fitting piece of a pipe bush and an edge of a fitting recessed part thereof can easily abut on each other along the vertical direction of the pipe bush.SOLUTION: Fitting piece side crushing places 102, 112 are set in the fitting pieces 64, 84 of the pipe bush 62, and recessed part side crushing places 104, 114 are set outside of the edges of the fitting recessed parts 74, 94, in which the fitting pieces 64, 84 are to be fitted. The pipe bush 62 is crushed in the thickness direction thereof in these fitting piece side crushing places 102, 112 and the recessed part side crushing places 104, 114. The edges of the fitting pieces 64, 84 and the fitting recessed parts 74, 94 are thereby abut on each other without generating a gap in the vertical direction.

Description

  The present invention relates to a vehicle seat mounted on a vehicle.

  For example, in the configuration disclosed in Patent Document 1 below, the metal cylinder into which the headrest support is inserted has a metal flat plate bent or curved into a cylindrical shape having a rectangular cross section, and circumferentially formed in a recess formed at one end in the circumferential direction. A convex portion extending from the other end is fitted, and a convex portion extending from one end in the circumferential direction is fitted into a concave portion formed at the other circumferential end.

Japanese Patent No. 3740674

  In the state where the convex portion is fitted in the concave portion, the above metal cylinder is subjected to a crushing process so as to straddle the edge of the concave portion and the edge of the convex portion, thereby closely contacting the edge of the concave portion and the edge of the convex portion. ing.

  However, it is difficult to set the position of the crushing process in the crushing process across the edge of the concave part and the edge of the convex part, and if the position of the crushing process is shifted, the edge of the concave part or the convex part can be extended sufficiently. It cannot be done and the edge of a recessed part and the edge of a convex part cannot be stuck.

  In view of the above fact, the present invention can provide a vehicle seat that can easily abut the edge of the fitting piece of the pipe bush and the edge of the fitting recess along the vertical direction of the pipe bush. Is the purpose.

  According to a first aspect of the present invention, a vehicle seat according to the present invention extends downward from a frame-shaped or concave seatback frame that opens downward in the seat and a headrest provided above the seatback frame. A cylindrical headrest support into which a rod-like or cylindrical insertion portion is inserted, and a circumferential direction so as to be joined to the state of the seat back frame on the front side of the seat back frame and to be opened at a circumferential end portion The upper end of the headrest support in the axial direction is fitted by fitting the fitting pieces extended from the both ends in the circumferential direction so as to face the fitting recesses formed at both ends in the circumferential direction. It is formed in the cylinder shape which can be inserted from, and the said insertion piece is thick in the insertion piece side crushing location set to the said axial direction edge part side in at least one said insertion piece And is set on the outer side of the fitting recess on the axial end portion side than the fitting piece side crushing location, and is formed on the recess side crushing location which forms a pair with the fitting piece side crushing location. And a pipe bush whose outer side is crushed in the thickness direction.

  In the vehicle seat according to the first aspect of the present invention, the seat back frame of the seat back provided on the rear side of the seat cushion is formed in a frame shape or a concave shape opened toward the lower side of the seat. A cylindrical pipe bush is joined to the upper end of the seatback frame, and a cylindrical headrest support is inserted into the pipe bush, and further, the headrest support is provided above the seatback frame. An insertion portion extending downward from the headrest is inserted.

  By the way, the above-mentioned pipe bush is formed, for example, by bending or bending a metal plate material into a cylindrical shape. Insertion recesses are formed at both ends in the circumferential direction of the pipe bush so as to extend from both ends in the circumferential direction of the pipe bush and face the engagement piece along the circumferential direction of the pipe bush. Then, the fitting piece is fitted into the fitting recess.

  The fitting piece side crushing part is set in the axial direction end part side of the pipe bush in the fitting piece fitted in the fitting concave part, and the fitting piece is crushed in the thickness direction at this fitting piece side crushing part. . Thereby, the fitting piece further extends in the axial direction of the pipe bush. In addition, a recess side crushing place is set on the outer side of the fitting recess into which the fitting piece is fitted and on the end side in the axial direction of the pipe bush with respect to the fitting piece side crushing place. The pipe bush is crushed in the thickness direction. Thereby, the edge of the fitting recess extends further in the axial direction of the pipe bush.

  Thus, the fitting piece side crushing portion and the concave portion side crushing portion are respectively crushed and plastically deformed, so that the fitting piece and the edge of the fitting depression come close to each other in the axial direction of the pipe bush. . Thereby, the clearance gap between an insertion piece and an insertion recessed part can be eliminated in the axial direction of a pipe bush. Moreover, since the fitting piece and the outer portion of the fitting recess are individually crushed, the position accuracy of each crushing location is compared to the configuration of crushing so as to straddle the outer periphery of the fitting piece and the edge of the fitting recess. It does not have to be high, and the work efficiency in the crushing work is good.

  A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect of the present invention, wherein the vehicle seat is at a distal end side than a proximal end side of the fitting piece along an extending direction of the fitting piece, The shape of the fitting piece is set so that the dimension along the axial direction of the pipe bush in the fitting piece is larger, and the fitting is performed on the bottom side than the opening side along the opening direction of the fitting recess. The shape of the fitting recess is set so that the opening width dimension of the piece is increased.

  According to the vehicle seat according to the second aspect of the present invention, the fitting piece is closer to the distal end side than the proximal end side along the extending direction, and the dimension along the axial direction of the pipe bush in the fitting piece. Is set to be large. On the other hand, the fitting recess is set so that the opening width dimension of the fitting piece is larger on the bottom side than on the opening side along the opening direction. For this reason, it is difficult for the fitting piece fitted into the fitting recess to come out of the fitting recess.

  A vehicle seat according to a third aspect of the present invention is the vehicle seat according to the second aspect, wherein the seat back frame is arranged such that a position of a circumferential end of the pipe bush faces a width direction of the seat back frame. The pipe bush is joined to the upper end of the pipe.

  According to the vehicle seat of the third aspect of the present invention, the pipe bush is joined to the upper end of the seat back frame so that the position of the end portion in the circumferential direction of the pipe bush faces the width direction of the seat back frame. Therefore, the flange portion between the one end and the other end in the circumferential direction of the pipe bush does not face the joint portion side of the pipe bush and the seatback frame, and reinforcing additional welding of the flange portion is unnecessary.

  In addition, when the pipe bush is joined to the seat back frame in this way, both ends along the axial direction of the pipe bush in the fitting piece and both ends along the axial direction of the pipe bush at the edge of the fitting recess are seat back frames. The direction is inclined in the vertical direction with respect to the front-rear direction. For this reason, when a load from the front side to the rear side of the seat back frame is applied to the pipe bush and a moment about an axis whose axial direction is the width direction of the seat back frame is generated, the fitting piece inclined as described above The edge part of this or the edge part of the insertion recessed part which contact | connects this edge part receives a load, and it suppresses that the circumferential direction both ends of a pipe bush open. Thereby, the mechanical strength with respect to the load from the front is also improved.

  The vehicle seat according to a fourth aspect of the present invention is the vehicle seat according to the third aspect of the present invention, wherein the fitting piece side crushing portion and the recess side are set lower than the intermediate portion in the axial direction of the pipe bush. The fitting piece side crushing location and the recessed portion crushing location set above the middle portion of the pipe bush in the axial direction are shifted from the crushing location to the front side in the front-rear direction of the seat back frame.

  According to the vehicle seat according to the fourth aspect of the present invention, the axial direction of the pipe bush is more than the fitting piece side crushing portion and the recess side crushing portion set below the axial direction intermediate portion of the pipe bush. The fitting piece side crushing location and the recessed portion crushing location set above the intermediate portion are shifted to the front side in the front-rear direction of the seat back frame.

  For this reason, when a load from the front side to the rear side of the seat back frame is applied on the upper side of the pipe bush and a moment around an axis whose axial direction is the width direction of the seat back frame is generated, the fitting that is inclined as described above. The end portion of the insert piece or the edge portion of the fitting recess in contact with the end portion receives the load more effectively, and the opening of both ends in the circumferential direction of the pipe bush is further effectively suppressed. Thereby, the mechanical strength with respect to the load from the front is also improved.

  As described above, the vehicle seat according to the present invention can easily abut the edge of the fitting portion of the pipe bush and the edge of the fitting recess along the vertical direction of the pipe bush.

1 is a perspective view of a seat back frame of a vehicle seat according to an embodiment of the present invention. It is an enlarged side view of a seat back frame upper end part and a pipe bush. It is an expanded view of a pipe bush. It is a figure which shows the manufacturing process of a pipe bush, (A) shows the state which bent the metal flat plate which forms a pipe bush, and formed in the cylinder shape, (B) is a fitting part side crushing location and a fitting recessed part side crushing location. (C) shows the state which joins a pipe bush to a seat back frame upper end part.

<Configuration of the present embodiment>
FIG. 1 is a perspective view showing a configuration of a main part of a seat back 12 of a vehicle seat 10 according to an embodiment of the present invention.

  As shown in this figure, the seat back 12 of the vehicle seat 10 includes a seat back frame 14 constituting a skeleton member of the seat back 12. The seat back frame 14 is provided on the rear side of a seat cushion (not shown) that constitutes the vehicle seat 10 together with the seat back 12. The lower end side of the seat back frame 14 is attached to the seat cushion frame so as to be rotatable about an axis whose axial direction is the width direction of the vehicle seat 10 with respect to the seat cushion frame constituting the skeleton of the seat cushion. ing.

  The seat back frame 14 includes a pair of left and right side frames 16. These side frames 16 are arranged so as to face each other in the width direction of the vehicle seat 10. A lower frame 18 is provided on the lower end side of these side frames 16. The lower frame 18 is formed in a plate shape in the thickness direction along the front-rear direction of the vehicle seat 10. One end in the longitudinal direction of the lower frame 18 is fixed to one side frame 16, and the other end in the longitudinal direction of the lower frame 18 is fixed to the other side frame 16. Thereby, the lower end sides of both side frames 16 are integrally connected by the lower frame 18.

  An upper frame 20 is provided on the upper end side of both side frames 16. The upper frame 20 is formed by curving into a substantially concave shape (or a substantially U shape) so as to open toward the lower side of the vehicle seat 10. One end in the longitudinal direction of the upper frame 20 is connected to the upper end of one side frame 16, and the other longitudinal end of the upper frame 20 is connected to the upper end of the side frame 16. Thereby, the upper ends of both side frames 16 are integrally connected by the upper frame 20.

  On the other hand, support wires 26 are provided at both ends of the longitudinal direction of the upper frame 20 (that is, the width direction of the vehicle seat 10 in the upper frame 20). One end (upper end) of a side wire 32 constituting a flat mat 30 as a support means is locked to each of the support wires 26. The side wire 32 is a wire whose longitudinal direction extends in the vertical direction of the vehicle seat 10.

  Further, a center wire 34 having a longitudinal direction along the vertical direction of the vehicle seat 10 is provided at a substantially center between the side wires 32. A plurality of main wires 36 are provided between the center wire 34 and the side wires 32. Each main wire 36 is generally elongated in the width direction of the vehicle seat 10, one end of which is locked to the side wire 32 and the other end is locked to the center wire 34.

  A plurality of main wires 36 are provided between the one side wire 32 and the center wire 34 at predetermined intervals in the longitudinal direction of the side wire 32 and the center wire 34, and the other side wire 32 and the center wire 34. A plurality of main wires 36 are provided at predetermined intervals in the longitudinal direction of the side wire 32 and the center wire 34 so that one side wire 32 is connected to the main wire 36 and the center wire 34 on one side. And the other side wire 32 via the other main wire 36. The middle portions of the main wires 36 in the longitudinal direction are bent or curved in a concave shape that opens downward toward the vehicle seat 10.

  A connecting wire 38 is provided between the side wire 32 and the side frame 16, and the side wire 32 and the side frame 16 are connected by the connecting wire 38.

  On the other hand, pipe bushes 62 are attached to the upper frame 20 by welding on the right and left sides of the center in the longitudinal direction of the upper frame 20 (that is, the width direction of the vehicle seat 10 in the upper frame 20). Each pipe bush 62 is formed in a cylindrical shape penetrating in the vertical direction of the vehicle seat 10, and a cross section cut in a direction orthogonal to the axial direction is rectangular (for example, square). More specifically, the pipe bush 62 is formed of a substantially rectangular (for example, square or rectangular) metal flat plate as shown in FIG. 3 in a longitudinal direction around an axis whose axial direction is one of the longitudinal direction and the width direction. And it is formed into a cylindrical shape with a square cross section by bending (or bending) at three locations along the other in the width direction.

  The pipe bush 62 is joined to the other end in the circumferential direction of the pipe bush 62 from the upper side in the up-down direction (axial direction) intermediate portion at one end in the circumferential direction of the pipe bush 62 (the joined state of the pipe bush 62 to the upper frame 20). Then, the fitting piece 64 is extended toward the front of the vehicle seat 10. A constricted portion 66 is set on the proximal end side with respect to the extending direction intermediate portion of the fitting piece 64.

  The constricted portion 66 is curved so as to open outward in the vertical direction from the edge of the fitting piece 64 with the outer side along the vertical direction (axial direction) of the pipe bush 62 as the center of curvature. On the other hand, an overhanging portion 68 is set on the front end side of the intermediate portion in the extending direction of the fitting piece 64. The projecting portion 68 is curved so as to project outward in the vertical direction from the edge of the fitting piece 64 with the inner side along the vertical direction (axial direction) of the pipe bush 62 as the center of curvature. That is, both ends of the fitting piece 64 along the vertical direction of the pipe bush 62 in the fitting piece 64 are substantially S-shaped (or reverse S-shaped) so that the base end side in the extending direction is narrower than the tip. It is curved.

  On the other hand, the lower side of the fitting piece 64 is a fitting recess 74. The fitting recess 74 is formed in a concave shape that opens toward the other circumferential end of the pipe bush 62. The upper edge in the vertical direction (axial direction) of the pipe bush 62 in the fitting recess 74 is the same as the lower edge in the vertical direction (axial direction) of the pipe bush 62 in the fitting piece 64. The fitting recess 74 has a line-symmetric shape with the center in the opening width direction (that is, the center in the vertical direction of the pipe bush 62 in the fitting recess 74) as the center.

  For this reason, both edges along the opening direction of the fitting recess 74 are curved so as to open inward in the opening width direction with the inner side in the opening width direction as the center of curvature at the base end side of the intermediate portion in the opening direction. In addition, the front end side of the intermediate portion in the opening direction is curved so as to project inward in the opening width direction with the outer side in the opening width direction as the center of curvature. That is, both ends of the insertion recess 74 in the opening width direction are curved in a substantially S shape (or an inverted S shape) so that the opening end side of the insertion recess 74 is narrower than the bottom side.

  From the lower side of the vertical (axial) intermediate portion at the other circumferential end of the pipe bush 62 toward the one end in the circumferential direction of the pipe bush 62 so as to face the fitting recess 74. The fitting piece 84 is extended so as to face the fitting recess 74 (toward the rear of the vehicle seat 10 when the pipe bush 62 is joined to the upper frame 20). The fitting piece 84 is provided with a constricted portion 86 and an overhanging portion 88 in the same manner as the constricted portion 66 and the overhanging portion 68 of the fitting piece 64, and the fitting piece 84 has a proximal end side in the extending direction from the tip. Both ends of the fitting piece 84 along the vertical direction of the pipe bush 62 are curved in a substantially S shape (or inverted S shape) so as to be tightly bundled.

  On the other hand, the upper side of the fitting piece 84 is a fitting recess 94. The fitting recess 94 is formed in a concave shape that opens toward one end in the circumferential direction of the pipe bush 62 so as to face the fitting piece 64, and, like the fitting recess 74, the opening end side is the bottom side. Both ends of the insertion recess 94 in the opening width direction are curved in a substantially S shape (or an inverted S shape) so as to be narrower. A fitting piece 64 is fitted inside the fitting recess 94, and the fitting piece 84 is fitted inside the fitting recess 74 in a state where the fitting piece 64 is fitted in the fitting recess 94. Yes.

  Further, the fitting piece side crushing portions 102 are set in both projecting portions 68 of the fitting pieces 64 in the pipe bush 62. At these fitting piece side crushing portions 102, the fitting pieces 64 are crushed in the thickness direction, and as can be seen by comparing (A) and (B) of FIG. The lower overhanging portion 68 extends downward from the state before being crushed. Further, a concave side crushing portion 104 is set above the fitting piece side crushing portion 102 set in the upper overhanging portion 68 and outside the edge portion of the fitting concave portion 94. A recess side crushing portion 104 is set below the set fitting piece side crushing portion 102 and outside the edge of the fitting recess 94.

  At these recess side crushing portions 104, the fitting pieces 64 are crushed in the thickness direction, and as can be seen by comparing (A) and (B) in FIG. The portion into which the upper overhanging portion 68 is fitted extends downward from the state before being crushed, and the portion into which the lower overhanging portion 68 is fitted is higher than the state before being crushed at the edge of the fitting recess 94. It extends to. Thereby, the edge of the insertion piece 64 and the insertion recessed part 74 is mutually contacting up and down without gap.

  On the other hand, a fitting piece side crushing portion 112 is set in a protruding portion 88 below the fitting piece 84 in the pipe bush 62. In this fitting piece side crushing portion 112, the fitting piece 84 is crushed in the thickness direction, and as can be seen by comparing (A) and (B) in FIG. It extends downward from the state. Further, a concave side crushing portion 114 is set below the fitting piece side crushing portion 112 and outside the edge of the fitting concave portion 74. At these recess side crushing portions 114, the fitting pieces 84 are crushed in the thickness direction, and as can be seen by comparing (A) and (B) in FIG. The portion into which the lower overhanging portion 88 is fitted extends upward from the state before being crushed. Thereby, the edge part of the insertion piece 84 and the insertion recessed part 74 is mutually contacting up and down without the clearance gap.

  A pipe-like headrest support 122 extending downward from the headrest of the vehicle seat 10 is inserted into these pipe bushes 62. Further, a rod-like or cylinder extending downward from the headrest is inserted into the headrest support 122. The head-rest is attached by inserting the shaped insertion portion.

<Operation and effect of this implementation>
Next, the operation and effect of the present embodiment will be described.

  In order to form the pipe bush 62 in the vehicle seat 10, first, an approximately rectangular (for example, square or rectangular) metal flat plate shown in FIG. It is bent (or curved) around three points along the other in the longitudinal direction and the width direction. Further, the fitting piece 64 formed on one end of the bent (or curved) metal plate is fitted into the fitting recess 94 formed on the other end, and the fitting formed on the other end of the metal plate. The insert piece 84 is fitted into a fitting recess 74 formed at one end. Thereby, as shown to (A) of FIG. 4, a metal flat plate is shape | molded by the cross-sectional square cylinder shape.

  Next, as shown in FIG. 4B, the protruding portions 68 and 88 of the fitting pieces 64 and 84 and the fitting concave portions 74 at the fitting piece side crushing locations 102 and 112 and the concave portion crushing locations 104 and 114, The pipe bush 62 is crushed in the thickness direction outside the fitting recess 94. As a result, the upper overhanging portion 68 extends upward from the state before being crushed, and the lower overhanging portions 68 and 88 are extended downward from the state before being crushed, and The portion where the upper overhanging portion 68 is fitted in the edge portion extends downward from the state before being crushed, and the portion where the lower overhanging portion 68 is fitted in the edge portion of the fitting concave portion 94 and the fitting concave portion 74. The portion of the edge where the lower overhang 88 fits is extended upward from the state before being crushed. Thereby, the edge part of the insertion pieces 64 and 84 and the insertion recessed parts 74 and 84 contact | connects mutually without a gap | interval.

  As shown in FIG. 4C, the pipe bush 62 formed in this manner has an upper rear surface in a state where both ends in the circumferential direction of the pipe bush 62 face inward in the width direction of the vehicle seat 10. Joined to the frame 20 by welding.

  In the pipe bush 62 joined to the upper frame 20 as described above, the fitting pieces 64 and 84 having the constricted portions 66 and 86 and the projecting portions 68 and 88 are formed into the constricted portions 66 and 86 and the projecting portions 68 and 88, respectively. It fits in the corresponding curved insertion recessed parts 74 and 94, and also, as mentioned above, the edge of the insertion pieces 64 and 84 and the insertion recessed parts 74 and 84 contact | connects mutually without a gap | interval. For this reason, when a load for separating the circumferential ends of the pipe bush 62 from each other acts on the pipe bush 62, the ends of the constricted portions 66 and 86 and the protruding portions 68 and 88 of the fitting pieces 64 and 84 are constricted. The edges of the curved fitting recesses 74 and 94 corresponding to the portions 66 and 86 and the overhanging portions 68 and 88 interfere with each other, and the other end of the pipe bush 62 is restricted from being separated from one end in the circumferential direction. As a result, the pipe bushing 62 is hardly deformed such that both ends in the circumferential direction of the pipe bushing 62 are opened, and the mechanical strength of the pipe bushing 62 is high.

  The fitting piece 64 extends forward from the circumferential end of the pipe bush 62 with the pipe bush 62 joined to the upper frame 20, whereas the fitting piece 84 pipes to the upper frame 20. The bush 62 extends rearward from the circumferential end of the pipe bush 62 in a joined state. For this reason, the fitting piece side crushing portion 102 set in the overhanging portion 68 of the constricted portion 66 and the concave portion side crushing portion 104 corresponding to the fitting piece side crushing portion 102 are fitted into the overhanging portion 88 of the constricted portion 86. It is located on the front side of the vehicle seat 10 with respect to the concave side crushing part 114 corresponding to the one side crushing part 112 and the fitting one side crushing part 112.

  By setting the fitting piece side crushing locations 102 and 112 and the recess side crushing locations 104 and 114 in this way, for example, as shown in FIG. 2, a load F from the front upper side acts on the headrest. Thus, even when a moment M centered on the joint between the pipe bush 62 and the upper frame 20 is applied, deformation of the pipe bush 62, particularly, the pipe bush 62 in which both ends in the circumferential direction of the pipe bush 62 are opened. Deformation hardly occurs, and the mechanical strength of the pipe bush 62 can be improved.

  In addition, since the deformation that opens both ends of the pipe bush 62 can be effectively prevented or suppressed in this way, the rear surface of the pipe bush 62 can be placed with both ends of the pipe bush 62 facing the width direction of the vehicle seat 10. The pipe bushing 62 can be joined to the upper frame 20 by welding to the upper frame 20. For this reason, it is not necessary to reinforcely weld the surfaces where both ends of the pipe bush 62 in the circumferential direction are positioned, which contributes to reduction in work man-hours and, in turn, cost reduction.

  Further, the fitting piece side crushing locations 102 and 112 are set to the fitting pieces 64 and 84, and the concave portion crushing locations 104 and 114 are set to the fitting concave portions 74 and 94. Thus, since the fitting piece side crushing places 102 and 112 and the recessed part crushing places 104 and 114 do not straddle the fitting pieces 64 and 84 and the fitting concave parts 74 and 94, the fitting piece side crushing places 102 and 112 In addition, the position accuracy of the crushing portions 104 and 114 on the recess side need not be strict, and the workability of the crushing process at the crushing portions 102 and 112 on the fitting side and the crushing portions 104 and 114 on the recess side is good.

DESCRIPTION OF SYMBOLS 10 Vehicle seat 14 Seat back frame 62 Pipe bush 64 Insertion piece 74 Insertion recessed part 84 Insertion piece 94 Insertion recessed part 102 Insertion piece side crushing place 104 Insertion recessed part location 112 Insertion piece side crushing place 114 Insertion recessed part location 122 Headrest support

Claims (4)

A concave seat back frame that opens toward the bottom of the frame or the seat;
A cylindrical headrest support into which a rod-like or cylindrical insertion portion extending downward from a headrest provided above the seat back frame is inserted;
It is joined to the state of the seat back frame on the front side of the seat back frame, and is opposed to the fitting recesses formed at both ends in the circumferential direction so as to open at the circumferential ends. At least one of the fitting pieces is formed into a cylindrical shape in which the headrest support can be inserted from the upper end in the axial direction by fitting the fitting pieces extending from both ends in the circumferential direction into the fitting recess. The fitting piece is crushed in the thickness direction at the fitting piece side crushing location set on the axial end portion side, and the fitting concave portion on the axial end portion side than the fitting piece side crushing location. A pipe bush in which the outside of the fitting recess is crushed in the thickness direction at the recess side crushing location which is set to the outside and forms a pair with the fitting piece side crushing location,
A vehicle seat comprising:   The fitting piece is arranged such that the dimension along the axial direction of the pipe bush in the fitting piece is larger on the distal side than the proximal end side of the fitting piece along the extending direction of the fitting piece. The shape of the said insertion recessed part was set so that the opening width dimension of the said fitting piece might become large in the bottom part side rather than the opening side along the opening direction of the said insertion recessed part while setting a shape. Vehicle seats.   The vehicle seat according to claim 2, wherein the pipe bush is joined to an upper end of the seat back frame so that a position of a circumferential end portion of the pipe bush is directed in a width direction of the seat back frame.   The fitting piece side set above the axially intermediate portion of the pipe bush than the fitting piece side crushing location and the recess side crushing location set below the axial intermediate portion of the pipe bush The vehicle seat according to claim 3, wherein the crushed portion and the recessed portion-side crushed portion are set to be shifted to the front side in the front-rear direction of the seat back frame.

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