JP4023714B2 - Headrest stay - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a headrest stay, and in particular, assembled from the headrest and from within the headrest.Twin pipe materialRelates to a headrest stay that protrudes.
[0002]
[Prior art]
  A conventional headrest stay is formed by bending a rod-shaped pipe material into a substantially U-shape. And it is assembled | attached to a headrest and a pair of rod-shaped site | part is made to protrude from the inside of the headrest. In addition, a pair of headrest supports are disposed on the upper portion of the seat back at a predetermined interval while the shaft holes are oriented in the vertical direction. For this reason, each rod-shaped part of the headrest stay that protrudes with respect to each shaft hole is inserted, and the headrest is supported by the seat back.
[0003]
[Problems to be solved by the invention]
  In the above-described conventional headrest stay, the pipe material is bent so that the interval between the rod-shaped portions coincides with the arrangement interval of each headrest support. However, tolerance occurs depending on the inner diameter, hardness, elastic modulus, etc. of the pipe. There was a problem. For this reason, the position of the tip of the rod-like portion protruding from the headrest and the shaft hole of the headrest support do not coincide with each other, and the rod-like portion cannot be easily inserted into the coaxial hole in the seat assembly process.
[0004]
  In addition, when an automobile occupant changes the height of the headrest, the rod-shaped portion interferes with the shaft hole to cause a sense of resistance, so that it is difficult to smoothly move in the axial direction. The present invention has been made in view of the above problems, and an object of the present invention is to provide a headrest stay that can improve the workability in the seat assembling process and can realize a smooth height change of the headrest.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the invention according to claim 1The headrest stay is divided into five members: a pipe material, a pair of plate materials, and a pair of pipe materials. The lower end opening of this pair of pipe materials Is rounded to form a smooth end face, and a taper press process is performed in the vicinity of the upper end opening so that the outer peripheral surface is tapered toward the tip, and this upper end opening is pushed in the press direction. The inner diameter in the direction perpendicular to the flattened direction is slightly longer than the width of the plate material. Taper press processing is performed on both ends of the pipe material so that the outer peripheral surface faces the tip. Are formed in a tapered shape, and the both end openings are further flattened by crushing in the pressing direction, and one end of the pair of plate materials is inserted into the crushed portion of the upper end opening of the pair of pipe materials, Further, the other end of the pair of plate members is inserted into the crushed portions of both ends of the pipe member, and the respective inserted portions are caulked and fixed. Or The central axis of the type material, so that the central axis coincides at each end of the plate of the pair, the pipe member of the pair, or a pipe member, a plate pairs positioned respectively,
A headrest stay is formed in which meat pressed from the back via a striking structure projects to the front side on the lower end side of the pair of plate members.
[0006]
  The headrest stay formed in this way corresponds to a substantially U-shaped wing side when assembled to the headrest.Twin pipe materialProject from the headrest. And this protrudingTwin pipe materialAre inserted into shaft holes of a pair of headrest supports arranged at predetermined intervals on the upper portion of the seat back, and the headrest is supported on the upper portion of the seat back. Here, the headrest stay has a predetermined bent shape in advance.Twin plate materialThis is used becauseTwin plate materialAt the time of forming the aboveTwin pipe materialThe interval can be determined. That is, the aboveTwin pipe materialMatch the spacing of the headrest support with the spacing of the above,Twin pipe materialThere is no need to bend it into a substantially U shape. Therefore,Twin pipe materialWhen bending, the tolerance caused by hardness and elastic modulus is eliminated, and the above-mentioned headrest support is arranged according to the intervalTwin pipe materialIt is possible to set the interval.
[0007]
  Connected in combinationPair of plate material and pipe material, pair of pipe materialAs an example, in the headrest stay according to claim 1, the headrest stay is substantially L-shaped.Twin plate materialAnd each end is eachBoardConnected to one end ofPipe materialAnd one end of eachBoardConnected to the other end ofTwin pipe materialWithConfigure. In the invention according to claim 1 configured as described above,BoardWhenPipe materialWhenTwin pipe materialAre formed individually. AndPipe materialEach end of eachBoardConnected to one end ofTwin pipe materialOne end of eachBoardA headrest stay is formed by connecting to the other end of the headrest.
[0008]
  Also, connected in combinationBoardWhenTwin pipe materialAs another example of the above, in the headrest stay according to claim 1, the headrest stay is formed in a substantially U-shape.BoardAnd one end is the sameBoardWhen connected to each end ofTwin pipe materialWithConfigure. In the invention according to claim 1 configured as described above, it is formed in a substantially U-shape.BoardWhenTwin pipe materialAre formed individually. And eachPipe materialOne end ofBoardBy connecting to the respective ends, a substantially U-shaped headrest stay is formed.
[0009]
  the aboveTwin plate materialAs an example of the configuration of claim 1,DescribedIn the headrest stay,Twin plate materialIs formed of a plate material bent in the width direction of the plate surfaceConfigure. In the invention concerning Claim 1 comprised as mentioned above, it forms with the board | plate material bent to the width direction of a board surface.Twin plate materialAnd aboveTwin pipe materialAnd combine them together. Then, a pair of the headrest supports are arranged in the vehicle width direction at a predetermined interval.Pipe materialWhen you insertTwin plate materialAre oriented in the longitudinal direction of the vehicle. That is, the sameTwin plate materialSince the thickness direction is oriented in the front-rear direction of the vehicle and the width direction is oriented in the left-right direction of the vehicle, it is easy to bend in the front-rear direction of the vehicle. Therefore, when sudden braking is applied to the head of the occupant backward and the headrest is pressed from the front,Twin BoardCan absorb the shock by bowing backward with the lower end portion as a fulcrum. Thus, aboveTwin plate materialHowever, such a configuration is merely an example, and the headrest stay according to the present invention has the following advantages:Twin plate materialWhenEach pipe materialFrom the standpoint of being connected in combination, a prismatic shape that is thick toward the side orthogonal to the width direction of the plate surface or a cylindrical shape may be used.
[0010]
  By the way, aboveTwin plate materialWhenTwin pipe materialIn the headrest stay according to claim 1, as an example of a method for connecting in combination,Twin pipe materialIs composed of a tubular body, the aboveTwin plate materialInsert the end of theTwin pipe materialA structure in which the outer wall surface in the vicinity of the end of the wire is pressed and fixed in a direction perpendicular to the axis.To. In the invention according to claim 1 configured as described above, it is configured by a tubular body.Twin pipe materialThe end opening of the aboveTwin plate materialThe end of is inserted. And the relevantTwin pipe materialThe outer wall surface in the vicinity of the end is pressed from the direction orthogonal to the axis. Then, the sameTwin pipe materialTogether with the wallTwin plate materialThe wall surface of the slab is crushed and fixed by caulking.
[0011]
  In performing the caulking and fixing as described above, as an example of a method for positioning each member,The headrest stay according to claim 1,the aboveTwin plate materialThe end is aboveTwin pipe materialAnd the inner wall surface isTwin plate materialSame as outer wall ofTwin pipe materialIs accommodated in a substantially L-shaped positioning hole that can come into contact with the outer wall surface in the vicinity of the opening of theTwin pipe materialAre positioned so that they are parallel to each otherTo. Configured as aboveIn the invention according to claim 1,the aboveTwin plate materialEnd of the aboveTwin pipe materialIs inserted into the opening of theTwin plate materialWhenTwin pipe materialAnd is housed.
[0012]
  At this time,Twin plate materialOutside wall and aboveTwin pipe materialThe outer wall surface in the vicinity of the opening of theTwin plate materialSame as end ofTwin pipe materialAre positioned parallel to each other. For this reason,Twin plate materialEnd of and aboveTwin pipe materialAnd in parallel with each otherTwin plate materialSame asTwin pipe materialIt is fixed by crimping. Therefore, it protrudes from inside the headrestTwin pipe materialThe interval between aboveTwin plate materialIt is possible to determine only by the bending angle.
[0013]
【The invention's effect】
  As described above, the present invention protrudes from the headrest.Twin pipe materialIt is possible to easily adjust the interval of the headrest support to the arrangement interval of the headrest support. For this reason, while improving workability | operativity in a sheet | seat assembly process, the headrest stay which can implement | achieve smooth vertical movement of a headrest can be provided. Also,BoardBy miniaturizing theBoardIt is possible to reduce the waste of raw materials generated when cutting out. Claims1According to the invention concerningTwin plate materialBy miniaturizing theTwin plate materialIt is possible to reduce the waste of raw materials generated when cutting out.
[0014]
  further,Invention according to claim 1Therefore, it is possible to provide a buffer function. Furthermore, according to the invention concerning Claim 1, each member can be connected easily. further,Invention according to claim 1According to this, each member can be connected by accurately determining the connection angle. further,Claim 1According to Ming, the headrest support can be smoothly inserted into the shaft holeTwin pipe materialCan be formed.Further, according to the invention according to claim 1, since the punched structure in which the meat pressed from the back on the lower end side of the pair of plate members protrudes toward the near side is formed, it is durable when bending the lower end portion to the fulcrum. It becomes possible to improve the property.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Here, embodiments of the present invention will be described in the following order.
(1) Description of the configuration at the upper part of the seat back: (2) Description of the configuration of the headrest stay: (3) Description of rounding: (4) Description of taper press processing: (5) Description of positioning and caulking and fixing: (6 ) Explanation of kerf formation: (7) Headrest stay modification 1: (8) Headrest stay modification 2: (9) Summary:
[0016]
  (1) Description of Configuration at Upper Seat Back: FIG. 1 is a perspective view showing the configuration at the upper seat back. In the figure, a pair of cylindrical brackets whose axes are oriented in the vertical direction are attached to the upper part of a seat back 10 of a first seat (second seat) mounted on an automobile. Further, substantially cylindrical headrest supports 11 and 12 are respectively inserted from the upper openings of the respective cylindrical brackets, and headrest stays protruding substantially vertically downward from the headrest 20 from the upper openings of the respective headrest supports 11 and 12. Configure 30TwinPipe materials 31 and 32 are inserted, respectively. A cut groove 31a is provided on the outer wall surface of the pipe material 31 at predetermined intervals in the length direction, and a lock piece 11a1 that can move forward and backward with respect to the cut groove 31a is provided near the upper end of the headrest support 11. A lock mechanism 11a is provided. With this configuration, when any of the cut grooves 31a faces the lock piece 11a1, the lock piece 11a1 is inserted into the cut groove 31a, and the vertical movement of the headrest 20 is restricted and locked to a desired height.
[0017]
  (2) Description of Configuration of Headrest Stay: FIGS. 2 and 3 show a main configuration of the headrest stay 30 assembled to the headrest 20. The headrest stay 30 is formed in a substantially U-shape, and is incorporated in the headrest 20 with a pair of free ends protruding vertically downward. The headrest stay 30 is provided with a metal rod-shaped pipe member 33, and each end opening of the pipe member 33 is made of a resin pressed into a substantially L shape as shown in FIGS. 4 and 5.TwinOne ends of the plate members 34 and 35 are inserted and fixed by caulking, respectively. The other ends of the plate members 34 and 35 bent by a predetermined angle areTwinThe pipe members 31 and 32 are inserted into the upper end openings and fixed by caulking.
[0018]
  Here, it leans to the front side of the headrest 20TwinThe plate members 34 and 35 are formed wide in the width direction of the headrest 20 and are formed thin in the front-rear direction of the headrest 20. For this reason, at the time of sudden braking, when an impact is applied rearward to the head of the occupant and the headrest 20 is pressed from the front, as shown in FIG.TwinWith the lower end portion supported by the pipe materials 31 and 32 as a fulcrum, it is possible to absorb the impact by warping backward in a bow shape. In addition,TwinAs shown in FIG. 7, a punching structure is formed on the lower end side of the plate members 34 and 35, and the meat pressed from the back of the paper surface in FIG. 2 protrudes toward the front side of the paper surface. In this way, when the punching structure is formed, the bending strength in the direction perpendicular to the paper surface in the figure can be increased, so that the durability is improved when the lower end portion is bent to the fulcrum as shown in FIG. It becomes possible.
[0019]
  By the way, when inserting the lower end side of each pipe material 31, 32 into each headrest support 11, 12, respectively,TwinIf the interval between the pipe members 31 and 32 does not coincide with the arrangement interval of the headrest supports 11 and 12, it becomes difficult to insert the headrest supports 11 and 12, and the headrest 20 can be smoothly moved up and down during height adjustment. It becomes difficult. Therefore, in this embodiment, the headrest stay 30 is replaced with the pipe material 33,TwinPlate members 34, 35,TwinThe pipe members 31 and 32 are divided into a total of five members, and are connected to each other so that no tolerance is generated in the assembly angle of each member. By this method, the tolerance generated in the distance between the free ends as in the case where one pipe material is bent into a substantially U-shape is eliminated. Hereinafter, the pipe materials 31 to 33 are molded, and the pipe material 33,TwinPlate members 34, 35,TwinAssemble each member of the pipe material 31, 32,TwinDetails of each work process when forming the cut groove 31a in the pipe materials 31, 32 will be described.
[0020]
  (3) Explanation of rounding:TwinThe lower ends of the pipe members 31 and 32 are rounded.TwinSince the pipe materials 31 and 32 are usually used by cutting out a long pipe material to a desired length, the cut surface of the opening end is sharp and square. For this reason, when the headrest stay 30 is inserted into the headrest supports 11 and 12, the operator's hand may be touched, or when the headrest stay 30 is pulled out from the headrest support 11 or 12, the user's hand may be touched.TwinThe cut surfaces of the pipe materials 31 and 32 are rounded to form smooth end surfaces.
[0021]
  As shown in FIG.TwinWith an inner diameter approximately equal to the outer diameter of the pipe materials 31, 32,TwinA bottomed cylindrical mold hole 41 that is shallower than the entire length of the pipe members 31 and 32 is provided. The mold hole 41 is formed with a curved surface so that the inner diameter gradually decreases from the side wall surface toward the back surface 41a. With this configuration,TwinWhen the lower end side of the pipe materials 31, 32 is inserted to the vicinity of the back surface 41a of the mold hole 41,TwinThe upper ends of the pipe members 31 and 32 protrude from the upper opening of the mold hole 41. here,TwinWhen pressing vertically downward from the upper end of the pipe materials 31, 32 toward the back surface 41a,TwinThe lower ends of the pipe members 31 and 32 are deformed along the curved surface shape of the back surface 41a, and the cut surface of the opening end can be rounded.
[0022]
  (4) Explanation of taper press working: AndTwinA taper press process is performed in the vicinity of the upper end openings of the pipe members 31 and 32.TwinThe open ends of the pipe members 31 and 32 are circular, and the wide plate members 34 and 35 shown in FIGS. 4 and 5 cannot be inserted as they are. For this reason,TwinOpen end of pipe material 31, 32TwinIt is necessary to mold according to the cross-sectional shape of the plate members 34 and 35. Therefore,TwinTaper press work is performed so that the outer peripheral surfaces of the pipe members 31 and 32 are deformed in a tapered shape toward the tip.
[0023]
  As shown in FIG. 9, the taper pressing jig 50 includes a pair of movable dies 51 and 52 that can move in directions toward or away from each other. Each movable mold 51, 52 has a mold surface 51a, 52a. As shown in FIGS. 10 to 12, each mold surface 51a, 52a is shallow in the moving direction and orthogonal to the moving direction. A rectangular opening forming portion 51a1, 52a1 that is wide in the direction, and the depth gradually increases from the lower end of the opening forming portion 51a1, 52a1 in the moving direction, and the opening forming portion 51a1, in the direction orthogonal to the moving direction. From the lower end of 52a1The taper forming portions 51a1 and 52a2 are gradually narrowed. In addition, when performing taper press processing,As shown in FIGS. 9-12, from the dimension between the opening molding parts 51a1 and 52a1 at the time of mold clamping,TwinA nesting 53 having a thickness obtained by substantially subtracting a dimension corresponding to twice the thickness of the pipe materials 31 and 32 is provided.TwinInserted into the pipe members 31, 32.
[0024]
  With this configuration, the insert 53 is inserted between the opening forming portions 51 a and 52 a provided in the movable molds 51 and 52.TwinWhen the movable molds 51 and 52 are brought close to each other as shown in FIG. 10 with the upper end portions of the pipe members 31 and 32 interposed therebetween, as shown in FIGS.TwinThe pipe members 31 and 32 are crushed by the mold surfaces 51 a and 52 a until the upper end portions of the pipe members 31 and 32 are pressed against the insert 53. Then, it was crushed by the opening molding parts 51a1 and 52a1 of the mold surfaces 51a and 52a.TwinThe upper end openings of the pipe members 31 and 32 are extruded flat in the pressing direction and become wider toward the side perpendicular to the pressing direction. At this time,TwinThe upper end openings of the pipe members 31 and 32 are crushed until the inner diameter in the pressing direction is slightly longer than the thickness of the plate members 34 and 35, and the inner diameter toward the side orthogonal to the pressing direction is reduced.TwinThe sheet material is pushed and expanded to a degree slightly longer than the width of the plate members 34 and 35.
[0025]
  Also,TwinThe pipe materials 31 and 32 are also crushed in the pressing direction by the taper forming portions 51a2 and 52a2 of the mold surfaces 51a and 52a. For this reason,TwinThe pipe members 31 and 32 are formed with tapered surfaces so that the width gradually decreases from the lower portion not pressed by the mold surfaces 51a and 52a toward the upper end opening. At this time, a tapered surface is formed on the side orthogonal to the pressing direction so as to gradually become wider from the lower portion not pressed by the mold surfaces 51a and 52a toward the upper end opening. In addition, also about the both ends opening of the pipe material 33,TwinTaper press working is performed in the same manner as the pipe materials 31 and 32.
[0026]
  (5) Description of positioning and caulking and fixing: Next, caulking and fixing the members 31 to 35 while positioning the pipe members 31 to 33 and the plate members 34 and 35. As shown in FIGS. 13 and 14, the positioning jig 60 includes a pair of movable dies 61 and 62 that can move in directions close to or away from each other. The positioning surfaces 61a and 62a are provided. The bent portions of the positioning surfaces 61a and 62a form a space having a rectangular cross section with a wide opening width and a shallow depth, and the remaining other portions of the positioning surfaces 61a and 62a are larger than the opening width of the bent portions. A semicircular space having a slightly smaller inner diameter is formed.
[0027]
  Further, from each end portion of the bent portion toward the other portion, the opening width is gradually narrowed, and the depth is gradually deepened so as to approach a semicircular cross section. With this configuration, each end opening of the pipe material 33TwinWhile inserting one end of each of the plate members 34 and 35,TwinAt the upper end opening of the pipe materials 31, 32TwinThe other ends of the plate members 34 and 35 are inserted, and the headrest stay 30 assembled in a substantially U shape is sandwiched between the movable dies 61 and 62. Then, the positioning surfaces 61a and 62a are pressed against each part of the headrest stay 30, and the positions of the members 31 to 35 are finely adjusted according to the shapes of the positioning surfaces 61a and 62a. When the ring-shaped mold clamping member 63 is tightened inward with the movable molds 61 and 62 in contact with each other, the gap between the movable molds 61 and 62 is eliminated and the mold is clamped. At this time, the members 31 to 35 of the headrest stay 30 are in a state of being assembled linearly. That is, the central axis of the pipe materials 31 to 33TwinThe pipe members 31 to 33 and the plate members 34 and 35 are positioned so that the central axes at the ends of the plate members 34 and 35 coincide with each other.
[0028]
  FIG. 15 is an enlarged view showing details of the configuration in the vicinity of the boundary between the pipe member 31 and the plate member 34 accommodated in the positioning jig 60, and FIG. 16 shows the part shown in FIG. 15 when viewed from the right side of the drawing. The figure is shown. The movable dies 61 and 62 are provided with through holes 61b and 62b while being spaced apart from each other in the vertical and horizontal directions. The through holes 61b and 62b communicate the positioning surfaces 61a and 62a of the movable dies 61 and 62 with the outer wall surface, and a cylindrical caulking member 64 is inserted into each of the through holes 61b and 62b. For this reason, when the movable dies 61 and 62 are clamped, the wall surface of the pipe material 31 can be crushed by pushing the caulking member 64 inward. Then, the plate material 34 is caulked and fixed to the pipe material 31 as the crushed pipe material 31 bites into the plate material 34.
[0029]
  At this time, the plate member 34 is fixed to the pipe member 31 from both sides at the four locations from the movable die 61 side and the four locations from the movable die 62 side. The connection angle with respect to 31 is fixed. In the above description, only the connection portion between the pipe member 31 and the plate member 34 is described. However, the connection portion between the pipe member 33 and the plate member 34, the connection portion between the pipe member 32 and the plate member 35, and the pipe member 33. Similarly, the plate members 34 and 35 are caulked to the pipe members 31 to 33 at the connection portion with the plate member 35. As described above, after the plate members 34 and 35 are caulked and fixed to the pipe materials 31 to 33 in the clamped state, the caulking members 64 are pulled out from the through holes 61b and 62b, and the movable dies 61 and 62 are illustrated. 13 is retracted to the front side and the back side of the sheet. Then, the U-shaped headrest stay 30 in which the plate members 34 and 35 are linearly connected to the pipe members 31 to 33 is taken out.
[0030]
  (6) Description of kerf formation: Then, a kerf 31a is formed in the pipe material 31 using a kerf forming jig 70 shown in FIG. The kerf forming jig 70 is provided with a cylindrical positioning hole 71a having an inner diameter slightly larger than the outer diameter of the pipe material 31, and in a direction perpendicular to the axis of the positioning hole 71a. And a fixed mold 71 having an opening 71b that communicates with each other. The opening 71b is provided with a mold surface 72a in which convex surfaces 72a1 are formed at predetermined intervals in the vertical direction on the surface facing the positioning hole 71a, and a movable die 72 that advances and retreats in a direction perpendicular to the axis of the positioning hole 71a is inserted. ing.
[0031]
  Further, a nest 73 having an outer diameter smaller than the inner diameter of the positioning hole 71a by the thickness of the pipe material 31 can be inserted into the positioning hole 71a. The nest 73 is provided on the movable die 72. A concave portion 73a is formed at a position facing the convex surface 72a1. The nest 73 can be divided in a direction perpendicular to the axis. As shown in FIG. 18, the divided parts are assembled with each other via an uneven guide 73b provided in the axial direction, and can be pulled out in the axial direction of the positioning hole 71a.
[0032]
  With this configuration, the pipe material 31 is inserted into the positioning hole 71 a of the fixed die 71, and the nest 73 is inserted into the pipe material 31 while the concave portion 73 a is opposed to the convex surface 72 a 1 of the movable die 72. At this time, a gap corresponding to the thickness of the pipe material 31 is generated between the inner peripheral surface of the positioning hole 71a below the pipe material 31 and the outer peripheral surface of the insert 73, and this gap is shown in FIG. As described above, a cylindrical push-out member 74 having a plurality of notches 74a formed in the axial direction is inserted.
[0033]
  Here, as shown in FIG. 20, the movable die 72 is moved toward the positioning hole 71a of the fixed die 71, and the pipe material 31 is pushed toward the concave portion 73a of the insert 73 by the convex surface 72a1 provided on the die surface 72a. When crushed, a cut groove 31a is formed in the wall surface of the pipe material 31 along the shape of the convex surface 72a1. After the cut groove 31a is formed, the movable die 72 is retracted from the positioning hole 71a of the fixed die 71, and the portion of the insert 73 on which the concave portion 73a is not formed is pulled out from the positioning hole 71a in the axial direction. Then, as shown in FIG. 21, when the lower end of the pipe member 31 is pushed up by the pusher 74, the pipe member 31 is pushed out from the upper opening of the positioning hole 71a.
[0034]
  (7) Modification Example 1 of Headrest Stay In the above-described embodiment, the headrest stay 30 is composed of five members, but there is no tolerance in the interval between the parts inserted into the upper openings of the headrest supports 11 and 12. From the viewpoint that the configuration is sufficient, it is also possible to configure it from three members as shown in FIG. That is, with the pipe material 33TwinInstead of using the plate members 34 and 35, a resin plate member 36 press-molded into a substantially U-shape is used, and the positioning jig 60 is used in the same manner as in the above-described embodiment.TwinThe pipe members 31 and 32 may be caulked and fixed.
[0035]
  At this time, the plate member 36 is formed wide in the width direction of the headrest 20 and is thinly formed in the front-rear direction of the headrest 20 as shown in FIG. For this reason,TwinAs with the plate members 34 and 35, the cushioning function of the headrest 20 can be exhibited with flexibility. Furthermore, the shape of the plate material 36 may be devised in order to suppress deformation of the horizontal portion of the plate material 36 in FIG. That is, as shown in FIGS. 24 and 25, the horizontal portion of the plate material 36 referred to here is rounded in the lateral direction, and the cross section is formed into a substantially ring shape. Then, deformation in the horizontal part is suppressed, and only the flexibility in the vertical part shown in FIG. 22 can be effectively exhibited. Further, when the headrest 20 is supported on the plate member 36, if the horizontal portion of the plate member 36 has a substantially cylindrical shape, the headrest 20 can be rotatably supported using the axis of the horizontal portion as a rotation axis. For this reason, it becomes a useful structure when adding a function for adjusting the inclination angle of the headrest 20.
[0036]
  (8) Modification 2 of headrest stay: In the above-described embodiment, the plate member 34 and the pipe member 31 are caulked and fixed, but according to the arrangement interval of the headrest supports 11 and 12.TwinFrom the viewpoint that the interval between the pipe members 31 and 32 can be set, it is also possible to connect the plate member 34 and the pipe member 31 by adopting another method. For example, as shown in FIG. 26, at the time of taper press working, a nest 54 provided with a concavo-convex shape in the opposing direction of the mold surfaces 51a and 52a is used. Then, in the pipe material 31 after processing, as shown in FIG. 27, an uneven shape is formed on the inner wall. For this reason, as shown in FIG. 28, the plate member 34 is simply press-fitted into the pipe member 31 while adjusting the angle between the plate member 34 and the pipe member 31, and the connecting portion is not distorted at a desired connecting angle. The plate material 34 and the pipe material 31 can be connected.
[0037]
  As another method, as shown in FIG. 29, each end of the plate member 34 is formed in a cross-sectional shape in advance. Then, when the tip portion of the plate member 34 is inserted into the pipe member 31 instead of the insert 54 and the like, and the connection angle of the plate member 34 to the pipe member 31 is determined, as shown in FIG. As shown in FIG. 3, the plate member 34 is deformed along the shapes of the mold surfaces 51a and 52a. Therefore, since the plate member 34 and the pipe member 31 can be connected only by performing the taper pressing process, the number of manufacturing steps of the headrest stay 30 can be reduced.
[0038]
  (9) Summary: In this way, the rod-shaped pipe member 33 was pressed into a substantially L shape.TwinPlate members 34 and 35;TwinThe pipe members 31 and 32 are combined and caulked and fixed to form a substantially U-shaped headrest stay 30. For this reason, it protrudes from the headrest 20TwinThe interval between the pipe members 31 and 32 can be easily adjusted to the arrangement interval of the headrest supports 11 and 12. For this reason, it is possible to improve workability in the seat assembling process and to realize smooth vertical movement of the headrest 20.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of an upper portion of a seat back according to an embodiment.
FIG. 2 is a plan view showing a main configuration of a headrest stay assembled to the headrest.
FIG. 3 is a side view showing a main configuration of a headrest stay assembled to the headrest.
FIG. 4 is a cross-sectional view showing a connection state of each member in the headrest stay.
FIG. 5 is a cross-sectional view showing a connection state of each member in the headrest stay.
FIG. 6 is a side view showing a situation when an impact is applied to the headrest.
7 is a cross-sectional view showing a cross-section AA in FIG. 2;
FIG. 8 is a cross-sectional view showing a situation when a pipe material is rounded by a rounding jig.
FIG. 9 is a cross-sectional view showing a configuration of a taper pressing jig.
FIG. 10 is a cross-sectional view showing a taper pressing jig when the mold is clamped.
11 is a cross-sectional view showing a cross section BB in FIG.
12 is a cross-sectional view showing a cross section CC in FIG.
FIG. 13 is a cross-sectional view showing a situation when each member is positioned by a positioning jig.
FIG. 14 is a cross-sectional view showing a situation when each member is positioned by a positioning jig.
FIG. 15 is a cross-sectional view showing a situation when caulking and fixing.
FIG. 16 is a plan view showing a situation when caulking and fixing.
FIG. 17 is a cross-sectional view showing a situation when a pipe material is mounted on a kerf forming jig.
18 is a cross-sectional view taken along the line DD of FIG.
19 is a cross-sectional view showing the EE cross section of FIG.
FIG. 20 is a cross-sectional view showing a situation when a cut groove is formed in a pipe material by a cut groove forming jig.
FIG. 21 is a cross-sectional view showing a situation when a pipe material is extruded from a kerf forming jig.
22 is a plan view showing the main configuration of a headrest stay according to Modification 1. FIG.
FIG. 23 is a side view showing a main configuration of a headrest stay according to a first modification.
FIG. 24 is a plan view showing a situation when a horizontal portion of a plate material is rounded.
25 is a cross-sectional view showing an FF cross section of FIG. 24. FIG.
FIG. 26 is a cross-sectional view showing a situation when taper pressing is performed on a pipe material according to Modification 2;
FIG. 27 is a cross-sectional view showing a configuration of a pipe material according to Modification 2.
FIG. 28 is a cross-sectional view showing a situation when a plate material is press-fitted into a pipe material.
FIG. 29 is a perspective view showing a plate material whose both ends have been processed into a U-shaped cross section in advance.
FIG. 30 is a cross-sectional view showing a situation when taper pressing is performed on a pipe material with a plate material inserted.
FIG. 31 is a cross-sectional view showing a taper pressing jig when the mold is clamped.
[Explanation of symbols]
[0039]
30 ... Headrest stay
31-33 ... Pipe material
31a ... kerf
34-36 ... Plate material
40 ... Rounding jig
41 ... mold hole
41a ... back
50 ... Taper press jig
51, 52 ... Movable type
51a, 52a ... mold surface
51a1, 52a1 ... Opening molding part
51a2, 52a2 ... Tapered molded part
53 ... Nested
60 ... Positioning jig
61 ...Movable type
62 ...Movable type
63 ... through hole
63a ... caulking tool
70 ... kerf forming jig
71 ... Fixed type
71a ... positioning hole
71b ... opening
72 ... Movable type
72a ... Mold surface
72a1 ... Convex surface
73 ... Nested
73a ... recess
73b ... Uneven guide
74 ... Extruder
74a ... Notch

Claims (1)

The headrest stay is divided into five members: a pipe material, a pair of plate materials, and a pair of pipe materials.
The lower end opening of the pair of pipe members is rounded to form a smooth end surface, and the taper press process is performed near the upper end opening so that the outer peripheral surface is tapered toward the tip. The upper end opening is flattened by crushing in the pressing direction, and the inner diameter in the direction perpendicular to the flattened direction is slightly longer than the width of the plate,
  In addition, taper press processing is performed on both end openings of this pipe material, and the outer peripheral surface is formed in a taper shape toward the tip.
Then, one end of the pair of plate members is inserted into the crushed portion of the upper end opening of the pair of pipe members, and the other end of the pair of plate members is crushed at both ends of the pipe member, Insert each one and fix each of these insertion points by caulking,
When caulking and fixing the insertion portion, the pipe material or pipe of the pair so that the central axis of the pipe material or pipe material of the pair coincides with the central axis at each end of the plate material of the pair. The material and the pair of plates are positioned,
  A headrest stay characterized in that meat pressed from the back via a striking structure projects to the lower side of the pair of plate members to the front side.

Images