JP4585375B2 - Headrest holding frame and method of manufacturing headrest holding frame - Google Patents

Description

  The present invention relates to a headrest holding frame that holds a headrest that supports a user's head and a method for manufacturing the headrest holding frame.

Conventionally, a headrest holding frame having a holding frame portion that holds a headrest that supports a user's head has been provided. In Patent Document 1, as shown in FIG. 18, a separate bracket 200 having a rectangular tube shape having an insertion opening 203 is used, and the flange portion 201 of the bracket 200 is fixed to the holding frame portion 110 by welding, and the headrest A technique for attaching the headrest 300 to the holding frame portion 110 by inserting the insertion portion 301 of 300 into the insertion opening 203 of the bracket 200 via a jig 302 is disclosed. Similarly, Patent Document 2 discloses a technique of a structure in which a separate bracket having a rectangular tube shape having an insertion opening is fixed to a holding frame portion by welding.
JP 2002-315649 A JP 2002-337585 A

  However, according to the above-described technique, the separate bracket 200 having a cylindrical shape having the insertion opening 203 is fixed to the holding frame portion 110 by welding, so that the number of parts increases.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a novel headrest holding frame and a method for manufacturing the headrest holding frame that can reduce the number of components, unlike the above-described structure.

The headrest holding frame according to the present invention is a headrest holding frame having a holding frame portion that holds a headrest that supports a user's head.
The holding frame part is arranged in the central area and extends along the horizontal direction, and the horizontal end is arranged on both sides of the horizontal central extension part and extends along the horizontal direction. An extending portion, a laterally extending central portion and a lateral end extending portion are connected to each other, and a longitudinally extending portion extending downward or upward is integrally formed by bending. The longitudinally extending portion has an insertion opening into which the insertion portion of the headrest is inserted.

  According to the headrest holding frame of the present invention, the headrest is held by the holding frame portion by inserting the insertion portion of the headrest into the insertion opening of the vertically extending portion of the holding frame portion. The longitudinally extending portion has a function equivalent to a conventional bracket, but is integrally formed by bending together with the laterally central extending portion and the lateral end extending portion of the holding frame portion, The number of parts is reduced.

  The manufacturing method of the headrest holding frame according to the present invention includes a first step of preparing a straight material pipe, and a lateral direction that is arranged in the central region and extends along the lateral direction by bending the material pipe. The central extension, the horizontal end extension arranged in the end region and extending along the horizontal direction, and the horizontal central extension and the horizontal end extension are connected to each other and downward or upward. A second step of forming a bent pipe including a longitudinally extending portion extending toward the first, and a second step of forming an insertion opening for inserting the insertion portion of the headrest into the longitudinally extending portion of the bent pipe. The three steps are performed in order. According to the manufacturing method according to the present invention, the above-described bent pipe including the laterally central extending portion, the lateral end extending portion, and the longitudinal extending portion is formed by bending from a straight material pipe. Can do.

  According to the headrest holding frame according to the present invention, the longitudinally extending portion has a function equivalent to that of a conventional bracket, but the holding frame portion is bent together with the laterally central extending portion and the lateral end extending portion. It is integrally formed by processing. For this reason, the conventional separate bracket can be reduced, and the number of parts can be reduced.

  According to the manufacturing method according to the present invention, the headrest holding frame of the present invention can be manufactured.

  The headrest holding frame according to the present invention has a holding frame portion that holds a headrest that supports a user's head. The holding frame portion has a function of holding the headrest, and includes a horizontal center extending portion, a horizontal end extending portion, and a vertical extending portion. The lateral center extending portion is disposed in the central area of the holding frame portion and extends along the lateral direction. The lateral end extending portions are arranged in the end region of the holding frame portion rather than the lateral central extending portion so as to be located on both sides of the lateral central extending portion, and extend along the lateral direction. It is what.

  The vertical extending portion connects the horizontal central extending portion and the horizontal end extending portion, and extends downward or upward. The vertical direction of the vertically extending portion may be the vertical direction or may be slightly inclined with respect to the vertical direction. As a holding | maintenance flame | frame part, the form currently formed with the pipe which uses a metal or hard resin as a base material can be illustrated. Examples of the holding frame portion include a form formed by bending a metal pipe. The longitudinally extending portion has an insertion opening into which the insertion portion of the headrest is inserted. The longitudinally extending portion is preferably noncircular in cross section. The insertion opening is also preferably non-circular. Examples of the non-circular shape include a polygonal shape such as a triangular shape, a quadrangular shape, a pentagonal shape, and a hexagonal shape, or a substantially polygonal shape.

  When the insertion part of the headrest is inserted into the insertion opening, the headrest insertion part is prevented from idling and the engagement between the insertion part of the headrest and the insertion opening of the longitudinally extending part is increased. is there. However, the cross-sectional shape of the longitudinally extending portion and the insertion opening may be circular.

  As an insertion opening, it can be set as the upper insertion opening provided only in the upper part of the longitudinal direction extension part. In this case, the insertion portion of the headrest has a structure that does not penetrate the longitudinally extending portion. Further, as the insertion opening, an upper insertion opening provided at the upper part of the vertical extension part, and a lower insertion opening provided at the lower part of the vertical extension part while communicating with the upper insertion opening. The form which has can be illustrated. Thereby, the insertion part of a headrest can be inserted in an insertion opening along an up-down direction. In this case, it can be set as the structure where the insertion part of a headrest penetrates a longitudinal direction extension part.

  According to the present invention, the horizontal center extending portion of the holding frame portion can be exemplified as being disposed below the lateral end extending portion. In this case, in the cross section along the axial center of the laterally extending central portion, the end on the laterally central extending portion side of the curved contour on the upper side of the longitudinally extending portion of the holding frame portion is the lateral end. The form located in the upper side rather than the axial center of the extension part or its extension line can be illustrated.

  Further, in the cross section along the axial center of the laterally extending central portion, the end on the lateral end extending portion side of the curved contour on the lower side of the longitudinally extending portion of the holding frame portion extends in the laterally central extension. The form located in the lower side rather than the axial core of an installation part or its extension line can be illustrated.

  According to the present invention, assuming that the circumferential length of the laterally extending central portion is L1, the circumferential length of the laterally extending portion is L2, and the circumferential length of the longitudinally extending portion is L3, L1 / L2 = 0. The form set to .75-1.25, L2 / L3 = 0.75-1.25, L1 / L3 = 0.75-1.25 can be illustrated. In this manner, L1, L2, and L3 are set to have substantially corresponding sizes. This suppresses fluctuations in the thickness of the pipe portion of the laterally extending central portion, the thickness of the pipe portion of the laterally extending portion, and the thickness of the pipe portion of the longitudinally extending portion. It is suppressed.

  According to the method for manufacturing the headrest holding frame according to the present invention, in the second step, the bent pipe is formed by bending the material pipe. The bent pipe includes a lateral center extending portion disposed in the central region and extending along the lateral direction, a lateral end extending portion disposed in the end region and extending along the lateral direction, And a longitudinally extending portion that extends downward or upward and connects the centrally extending portion and the lateral end extending portion. In the second step, it is possible to exemplify a form in which both end portions in the axial length direction of the bent pipe are straight. In this case, it is easy to replenish the bent portion with the meat material at both ends that are straight, and the thickness of the bent portion is easily secured. Next, in a 3rd process, the insertion opening which inserts the insertion part of a headrest in the longitudinal direction extension part of a bending pipe is formed.

  According to the manufacturing method according to the present invention, it is possible to exemplify a form in which both end portions in the axial length direction of the bent pipe are bent downward after the second step or after the third step. If the both ends of the bent pipe are bent downward in this way, the mountability for mounting the headrest holding frame on a seat such as a vehicle is ensured.

  Embodiments of the present invention will be described below with reference to FIGS. First, in the first step, as shown in FIG. 1, a straight cylindrical metal material pipe 1 having a hollow portion 1a penetrating in the axial direction is prepared. Examples of metals that can be easily deformed plastically include steel (including stainless steel), aluminum alloy, magnesium alloy, and titanium alloy.

  Next, in the second step, by using a press die and bending the central portion of the material pipe 1 in the axial length direction by pressing or hydroforming, the bent portions 2m and 2n are formed, so that FIG. A bent pipe 2 bent into a crank shape as shown is formed. Hydroforming is a processing method that uses fluid pressure such as water.

  As shown in FIG. 2, the bent pipe 2 is disposed in a central region in the axial length direction and is formed in a pipe-like lateral central extension portion 20 extending along the lateral direction, and in an end region in the axial length direction. A pipe-like lateral end extending portion 21 that is disposed and extends along the lateral direction, and connects the lateral central extending portion 20 and the lateral end extending portion 21 together with a pipe-shaped longitudinally extending portion. 22. The longitudinally extending portion 22 extends downward from an end 21 e near the center of the lateral end extending portion 21. That is, the longitudinally extending portion 22 is extended upward from both ends 20e of the laterally central extending portion 20. In the second step, as shown in FIG. 2, both end portions 24 in the axial length direction of the bent pipe 2 are straightened. In this way, when both end portions 24 are straight, compared to the case where both end portions 24 are bent in an L shape, the meat material constituting both end portions 24 is bent and processed. Therefore, it is easy to replenish in the direction of the arrow M1, and it is easy to ensure the thickness of the bent portion, particularly the thickness in the vicinity of the longitudinally extending portion 22.

  In the third step, as shown in FIG. 3, the upper insertion opening 31 is formed in the upper part of the longitudinally extending portion 22 of the bent pipe 2, and the lower insertion opening 32 is formed in the lower part. The upper insertion opening 31 and the lower insertion opening 32 communicate with each other. In this case, as shown in FIG. 4, the upper insertion opening 31 and the lower insertion opening 32 are formed in the vertical extension portion 22 by punching the upper and lower walls of the vertical extension portion 22 with a punching die 70. Form.

  After performing the third step, as shown in FIG. 5, a bent portion 2k is formed, and both end portions 24 in the axial length direction of the bent pipe 2 are L-shaped downward (in the direction of the arrow K1). Bend to. If the end 24 of the bent pipe 2 is bent downward in this manner, the mountability for mounting the headrest holding frame 4 on a seat such as a vehicle is ensured. Note that another member may be joined to the end 24 of the bent pipe 2.

  5 and 6 show the headrest holding frame 4 manufactured as described above. The headrest holding frame 4 is integrally formed by bending and is a single object. The headrest holding frame 4 has a holding frame portion 40 that holds the headrest 6 that supports the user's head. The holding frame portion 40 is integrally provided with a lateral center extending portion 20, a lateral end extending portion 21, and a longitudinal extending portion 22. The lateral center extending portion 20 is disposed in the central area of the holding frame portion 40 and extends along the lateral direction. The lateral end extending portion 21 is disposed in the end region of the holding frame portion 40 more than the lateral central extending portion 20, and extends along the lateral direction. The lateral center extending portion 20 is positioned relatively lower than the lateral end extending portion 21.

  The longitudinally extending portion 22 connects the end 20e of the laterally central extending portion 20 and the end 21e of the laterally extending end portion 21 and extends along the vertical direction. The longitudinally extending portion 22 has a plug opening 3. The insertion opening 3 is formed by an upper insertion opening 31 provided in the upper part of the longitudinally extending part 22 and a lower insertion opening 32 provided in the lower part of the longitudinally extending part 22. Accordingly, as shown in FIG. 6, the insertion portion 60 of the headrest 6 is inserted into the insertion opening 3 of the longitudinally extending portion 22 of the holding frame portion 40 along the vertical direction (arrow Y1 direction) via the jig 62. Can be plugged in.

  As shown in FIG. 5, the longitudinally extending portion 22 has a circular shape such as an elliptical shape or an oval shape in its cross section. Therefore, the upper insertion opening 31 and the lower insertion opening 32 have a circular shape such as an elliptical shape or an oval shape.

  According to the present embodiment, in the holding frame portion 40, the circumferential length of the lateral center extending portion 20 is L 1, the circumferential length of the lateral end extending portion 21 is L 2, and the circumferential length of the longitudinal extending portion 22. When L3 is L3, L1, L2, and L3 are set to have substantially corresponding sizes. As a result, fluctuations in the thickness of the pipe portion of the laterally central extending portion 20, the thickness of the pipe portion of the lateral end extending portion 21, and the thickness of the pipe portion of the longitudinal extending portion 22 are suppressed. Thinning is suppressed. Therefore, L1 / L2 = 0.75 to 1.25 (especially 0.85 to 1.15), L2 / L3 = 0.75 to 1.25 (especially 0.85 to 1.15), L1 / L L3 = 0.75 to 1.25 (particularly 0.85 to 1.15). The circumferential length means the length of the shortest distance in the circumferential direction.

  FIG. 4 is a cross-sectional view taken along the axis P1 of the horizontal center extending portion 20 of the holding frame portion 40 (and the axis P2 of the lateral end extending portion 21) before the insertion opening 3 is punched. The corresponding figure is shown. In FIG. 4, a curved contour 27 is formed on the upper side of the vertically extending portion 22 of the holding frame portion 40. A curved contour 28 is formed on the lower side of the longitudinally extending portion 22.

  As shown in FIG. 4, one end 27 u of the curved contour 27 is located on the lateral center extending portion 20 side in the direction along the shaft cores P <b> 1 and P <b> 2. The other end 27x of the curved contour 27 is located on the lateral end extending portion 21 side. Further, in the direction along the shaft cores P1 and P2, one end 28d of the curved contour 28 is located on the lateral end extending portion 21 side, and the other end 28y of the curved contour 28 is lateral. It is located in the direction center extension part 20 side.

  As shown in FIG. 4, the curved contour 27 has ends 27u and 27x. The end 27u is located above the axis P2 of the lateral end extending portion 21 (in the direction of arrow U, that is, the side away from the axis P1 of the lateral central extending portion 20). As a result, a distance L1 between the end 27u of the curved contour 27 and the axis P1 of the laterally central extending portion 20 is secured.

  Further, as shown in FIG. 4, the curved contour 28 has ends 28d and 28y. The end 28d is positioned below the axis P1 of the lateral center extending portion 20 (in the direction of arrow D, that is, the side away from the axis P2 of the lateral end extending portion 21). Thereby, a distance L2 between the end 28d of the curved contour 28 and the axis P2 of the lateral end extending portion 21 is ensured. As a result, as shown in FIG. 4, the axis between the end 27 u of the curved contour 27 on the upper side of the longitudinally extending portion 22 and the end 28 d of the curved contour 28 on the lower side of the longitudinally extending portion 22. When the distance in the perpendicular direction is LW, the distance LW is secured longer. For this reason, it becomes easy to ensure the distance which inserts the insertion part 60 of the headrest 6 in the vertical direction extension part 22, and stability of the attitude | position of the headrest 6 can be improved.

  Furthermore, according to the present embodiment, as shown in FIG. 4, the other end 27x of the curved contour 27 on the upper side of the longitudinally extending portion 22 has a longitudinally extending portion in the direction of the shaft cores P1 and P2. 22 in the direction of the arrow PB, that is, in the laterally central extension portion 20, not in the direction of the arrow PE with respect to the extension line PA of the outer wall surface 22 s (that is, the outer wall surface facing the lateral end extension portion 21). is doing. Further, the other end 28y of the curved contour 28 on the lower side of the longitudinally extending portion 22 has an outer wall surface 22t of the longitudinally extending portion 22 (that is, a laterally centrally extending portion) in the direction of the axial cores P1 and P2. It is located in the direction of the arrow PD, that is, in the lateral end extending portion 21 side, not in the direction of the arrow PF with respect to the extended line PC of the outer wall surface facing the portion 20. Also in this sense, the above-described distance LW is ensured to be long, and the stability of the posture of the headrest 6 can be improved. Furthermore, since the portion where the upper insertion opening 31 and the lower insertion opening 32 are formed is flattened, the upper insertion opening 31 and the lower insertion opening 32 are easily formed by punching. The curved contour 27 and the curved contour 28 having such arcs can be formed by adjusting the curvature of the die surface of the press die.

  In addition, since the degree of bending is high in the vicinity of the curved contour 27 and the curved contour 28 shown in FIG. 4, the tensile force in the direction of the arrow M2 acts on the meat material constituting the curved contour 27 and the curved contour 28. However, the thickness in the vicinity of the curved contour 27 and the curved contour 28 tends to be thin. In this respect, according to the present embodiment, the bent contour 27 and the vicinity of the bent contour 28 are punched and removed by the formation of the upper insertion opening 31 and the lower insertion opening 32, so that there is no particular problem.

  As described above, according to the present embodiment, the longitudinally extending portion 22 of the holding frame portion 40 has a function equivalent to the conventional bracket 200, but the laterally centrally extending portion of the holding frame portion 40 is provided. Since the part 20 and the lateral end extending part 21 are integrally formed by bending, the number of parts is reduced. Further, unlike the prior art shown in FIG. 18, the longitudinally extending portion 22 corresponding to the bracket 200 does not have to be attached to the holding frame portion 40 by welding, so that the problem of welding defects and welding distortion in the welded portion is solved. .

  Further, according to the present embodiment, the longitudinally extending portion 22 is formed through pipe bending, so that an increase in strength due to work hardening can be expected. Similarly, the lateral center extending portion 20 and the lateral end extending portion 21 are formed through pipe bending, so that an increase in strength due to work hardening can be expected, and the holding frame portion 40 is thinned. Even so, the stability of the posture of the headrest 6 can be enhanced.

  In the vertically extending portion 22 of the holding frame portion 40, the insertion portion 60 of the headrest 6 is inserted from above the upper insertion opening 31, so that the strength of the peripheral edge portion of the upper insertion opening 31 is secured. It is preferable that thinning of the peripheral edge portion of the insertion opening 31 is suppressed. In this regard, according to this embodiment, when the second step is performed, both end portions 24 in the axial length direction of the bent pipe 2 are made straight (see FIG. 2). In this case, it becomes easy to replenish the straight portion of the meat material of both end portions 24 toward the longitudinally extending portion 22 in the direction of the arrow M1 in the bent portion, and as a result, the longitudinal portion which is the bent portion. The thickness of the direction extending portion 22 near the curved contours 27 and 28 is easily secured, and the strength of the peripheral edge portion of the upper insertion opening 31 is secured.

  Each process can be performed in a normal temperature region, but may be performed in a warm region or a hot region. The hollow portion 1a of the material pipe 1 may be bent while being filled with a powdery or granular filler.

  7 to 11 show a second embodiment. Since the present embodiment basically has the same configuration and effect as the first embodiment, FIGS. 1 and 2 are applied mutatis mutandis. Hereinafter, the description will focus on the different parts. In the first step, as shown in FIG. 1, a straight cylindrical metal material pipe 1 having a hollow portion 1a penetrating in the axial direction is prepared. Next, in the second step, by using a press die and bending the central portion of the material pipe 1 in the axial length direction by pressing or hydroforming, the bent portions 2m and 2n are formed, so that FIG. The bent pipe 2 shown is formed. As shown in FIG. 2, the bent pipe 2 is disposed in a central region in the axial length direction and is formed in a pipe-like lateral central extension portion 20 extending along the lateral direction, and in an end region in the axial length direction. A pipe-like lateral end extending portion 21 that is disposed and extends along the lateral direction, and connects the lateral central extending portion 20 and the lateral end extending portion 21 together with a pipe-shaped longitudinally extending portion. 22.

  Next, the cylindrical longitudinally extending portion 22 of the holding frame portion 40 is pressed into a non-circular shape, that is, a rectangular shape or a substantially rectangular shape in the cross section of the longitudinally extending portion 22, and the longitudinally extending portion 22B is pressed. (See FIG. 7). The upper portion and the lower portion of the longitudinally extending portion 22B have a closing wall 22i. Both ends 24 of the bent pipe 2 having the longitudinally extending portion 22B are straight.

  In the third step, as shown in FIG. 8, the closing wall 22 i of the longitudinally extending portion 22 </ b> B is punched by a punching die, and the upper insertion opening 31 is formed in the upper portion of the longitudinally extending portion 22 </ b> B of the bent pipe 2. At the same time, a lower insertion opening 32 is formed in the lower part. The upper insertion opening 31 and the lower insertion opening 32 communicate with each other.

  After performing the third step, as shown in FIG. 9, the bent portion 2k is formed, and both end portions 24 in the axial length direction of the bent pipe 2 are bent downward (in the direction of the arrow K1). If both ends 24 of the bent pipe 2 are bent in this way, the mountability for mounting the headrest holding frame 4 on a seat such as a vehicle is secured. Another member may be joined to both ends 24 of the bent pipe 2.

  According to the present embodiment, the longitudinally extending portion 22B has a square shape or a substantially square shape in cross section, and the upper insertion opening 31 and the lower insertion opening 32 are noncircular, that is, a rectangular shape or a substantially rectangular shape. It is said that. As a result, when the insertion portion 60 of the headrest 6 is inserted into the upper insertion opening 31 and the lower insertion opening 32, the cross-sectional shape of the insertion portion 60 of the headrest 6 or the cross-sectional shape of the jig 62 is a square shape. Further, idling of the insertion portion 60 of the headrest 6 is easily prevented, and the engagement between the insertion portion 60 of the headrest 6 and the insertion opening 3 is enhanced. In addition, the axial center P1 of the horizontal direction central extension part 20 is offset to the side with respect to the axial center P2 of the horizontal direction extension part 21, and is made into the eccentric position.

  As described above, the cylindrical longitudinally extending portion 22 is pressed into a non-circular shape, that is, a quadrangular shape or a substantially quadrangular shape in the cross section thereof, so that the longitudinally extending portion 22B is formed as follows. . In this case, a bending apparatus 72 shown in FIGS. 10 and 11 is used. The bending apparatus 72 includes a lower mold 720 and an upper mold 750. The lower mold 720 includes a base 721, a pair of sandwiching molds 722 that have a clamping surface 723 with respect to the base 721 and are movable, and a spring that biases the clamping mold 722 in a direction to separate the clamping mold 722. And a biasing element 724 formed.

  The upper die 750 includes a punch die 753 having a punch surface 752 and a guide die 755 having a guide inclined surface 754 and an engaging surface 756. As shown in FIG. 10, the cylindrical pipe-like longitudinally extending portion 22 of the bent pipe 2 is disposed between the sandwiching molds 722, and in this state, the upper mold 750 is lowered to lower the upper mold 750 and the lower mold 720. And approach. Then, the cylindrical longitudinally extending portion 22 of the bent pipe 2 is pressurized by the punch surface 752 of the punch die 753 and shaped as a rectangular pipe-shaped longitudinally extending portion 22B as shown in FIG. .

  Here, when the circumferential length of the cylindrical pipe-shaped longitudinally extending portion 22 is La and the circumferential length of the rectangular pipe-shaped longitudinally extending portion 22B is Lc, La is set to be substantially the same as Lc. It is preferable. It is preferable to set Lc / La = 0.8 to 1.2, 0.85 to 1.15, and particularly 0.9 to 1.1. This is for avoiding that the thickness of the rectangular pipe-shaped longitudinally extending portion 22B into which the insertion portion 60 of the headrest 6 is inserted becomes too thin.

  If Lc / La = 1 and the longitudinally extending portion 22B has a square shape, the diameter of the cylindrically extending longitudinally extending portion 22 of the bent pipe 2 is Da, and a rectangular pipe-shaped longitudinally extending portion 22B is formed. When the length of the side of the direction extending portion 22B is Dc, basically, La = 3.14 × Da and Lc = 4 × Dc is established. Therefore, Dc = (3.14 / 4) × Da = 0.785 × Da is basically established. Therefore, when Lc / La = 1 and the longitudinally extending portion 22B has a square shape, the pair of sandwiching dies 722 are spaced apart by the guide action of the inclined guide surface 754 of the guide 755. It moves in the arrow X1 direction so that Le becomes narrow. Since the engaging surface 756 abuts on the regulating surface 726 of the clamping mold 722 and regulates, the distance Le between the two clamping molds 722 is kept constant. When the upper mold 750 is retracted from the lower mold 720 after the shaping is completed, the pair of sandwiching molds 722 are moved in the direction of the arrow X2 so that the interval Le is widened by the spring force of the biasing element 724.

  According to the present embodiment, in some cases, the circumferential length Lc of the rectangular pipe-shaped longitudinally extending portion 22B is shaped shorter than the circumferential length La of the cylindrically extending longitudinally extending portion 22. You can also. In this case, it can contribute to making the wall part which comprises the longitudinal direction extension part 22B thick. Therefore, Lc / La = 0.6 to 0.99 can be set, particularly 0.8 to 0.95.

  12 to 15 show the third embodiment. The present embodiment basically has the same configuration and effect as the second embodiment. Hereinafter, the description will focus on the different parts. As shown in FIG. 12, the holding frame portion 40 includes a laterally central extending portion 20 having a substantially square cross section, a lateral end extending portion 21 having a circular cross section, and a longitudinal extending portion having a substantially square cross section. 22B. As shown in FIG. 13, the laterally central extending portion 20 has a substantially quadrangular cross section, and has two first side portions 20 a and a second side portion 20 c adjacent to the first side portion 20 a. . According to the present embodiment, as shown in FIG. 14, the axis P3 of the longitudinally extending portion 22B is inclined at an angle θ so as to move away from the seat occupant side WK of the seat.

  As shown in FIG. 15, the longitudinally extending portion 22B has a substantially quadrangular cross section, and has two first side portions 22a and a second side portion 22c adjacent to the first side portion 22a. The insertion opening 3 includes an upper insertion opening 31 provided in the upper part of the vertical extension part 22B and a lower insertion provided in the lower part of the vertical extension part 22B so as to communicate with the upper insertion opening 31. An opening 32 is formed. Thereby, the insertion part 60 of the headrest 6 can be inserted in the insertion opening 3 along the arrow Y1 direction (refer FIG. 14). As shown in FIG. 15, the upper insertion opening 31 and the lower insertion opening 32 have a substantially rectangular cross section.

  FIG. 16 shows a fourth embodiment. The present embodiment basically has the same configuration and effect as the second embodiment. Hereinafter, the description will focus on the different parts. As shown in FIG. 16, the holding frame portion 40 includes a lateral center extending portion 20, a lateral end extending portion 21, and a longitudinal extending portion 22 </ b> B. The lateral center extending portion 20 is positioned relatively above the lateral end extending portion 21.

  The present embodiment basically has the same configuration and effect as the second embodiment. Hereinafter, the description will focus on the different parts. As shown in FIG. 17, the holding frame portion 40 includes a lateral center extending portion 20, a lateral end extending portion 21, and a longitudinal extending portion 22 </ b> B. Both end portions 24 of the lateral end extending portion 21 are elongated in the downward direction so as to extend toward the seat portion side of the seat. Thereby, the mountability to the seat of the headrest holding frame 4 is ensured.

  This embodiment basically has the same configuration and operation effects as the first, second, and third embodiments. Hereinafter, the description will focus on the different parts. 5, FIG. 9, and FIG. 12 apply mutatis mutandis. According to the present embodiment, the holding frame portion 40 includes the lateral center extending portion 20, the lateral end extending portion 21, and the longitudinal extending portions 22, 22B, and is integrally formed of a hard resin. Has been.

(Other)
The present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications as necessary.

  The present invention can be applied to a headrest device installed in a seat of a vehicle or the like.

1 is a perspective view of a material pipe according to Embodiment 1. FIG. It is a perspective view of the bent pipe which bent the material pipe. It is a perspective view of the state where the insertion opening was formed in the longitudinal direction extension part of the bent pipe. It is a block diagram which shows the process in which an insertion opening is formed in the longitudinal direction extension part of a bending pipe. It is a perspective view of a headrest holding frame. It is a perspective view which shows the state which attaches a headrest to a headrest holding frame. It is a perspective view of the bent pipe which bent the material pipe in connection with Example 2. It is a perspective view of the state where the insertion opening was formed in the longitudinal direction extension part of the bent pipe. It is a perspective view of a headrest holding frame. It is sectional drawing of the state before shaping | molding the vertical direction extension part of a cross-sectional square shape to a bending pipe with a bending process apparatus. It is sectional drawing of the state after shaping the longitudinal direction extension part of cross-sectional square shape to the bending pipe with the bending processing apparatus. It is a front view which concerns on Example 3 and shows the principal part of a curved pipe. FIG. 13 is a cross-sectional view of the bent central pipe extending in the lateral direction, showing a cross section taken along the cutting line W13-W13 of FIG. It is a side view which shows the principal part of a curved pipe. FIG. 15 is a cross-sectional view of a longitudinally extending portion of the bent pipe, showing a cross section taken along a cutting line W15-W15 in FIG. FIG. 10 is a perspective view of a headrest holding frame according to the fourth embodiment. FIG. 10 is a perspective view of a headrest holding frame according to the fifth embodiment. It is a perspective view which shows the state which concerns on a prior art and attaches a headrest to a headrest holding frame.

Explanation of symbols

  In the figure, 1 is a material pipe, 2 is a bent pipe, 20 is a laterally extending central part, 21 is a laterally extending end part, 22 and 22B are longitudinally extending parts, 3 is an insertion opening, 31 is An upper insertion opening, 32 is a lower insertion opening, 4 is a headrest holding frame, and 40 is a holding frame portion.

Claims (9)

In a headrest holding frame having a holding frame portion that holds a headrest that supports a user's head,
The holding frame part is arranged in a central area and extends along the horizontal direction, and the horizontal frame extending along the horizontal direction and arranged on both sides of the horizontal central extension part. A bending end process integrally forms a direction end extending portion and a longitudinal extending portion that extends downward or upward and connects the lateral center extending portion and the lateral end extending portion. And prepared
The longitudinally extending portion has an insertion opening into which the insertion portion of the headrest is inserted.   In Claim 1, The said insertion opening was provided in the lower part of the said vertical direction extension part while communicating with the upper insertion opening provided in the upper part of the said vertical direction extension part, and the said upper insertion opening. A headrest holding frame having a lower insertion opening.   The headrest holding frame according to claim 1 or 2, wherein the longitudinally extending portion has a circular shape or a non-circular shape in cross section.   4. The horizontal center extending portion of the holding frame portion according to claim 1, wherein the horizontal center extending portion is disposed below the lateral end extending portion, and the horizontal center In the cross section along the axial center of the extending portion, the end on the lateral central extending portion side of the curved contour on the upper side of the longitudinal extending portion of the holding frame portion is the lateral end extending A headrest holding frame, wherein the headrest holding frame is positioned above an axis of the portion or an extension line thereof.   5. The horizontal center extension part of the holding frame part according to claim 1, wherein the horizontal center extension part is disposed below the horizontal end extension part, and the horizontal center part is provided. In the cross section along the axial center of the extending portion, the end on the lateral end extending portion side of the curved contour on the lower side of the longitudinal extending portion of the holding frame portion extends in the lateral center. A headrest holding frame, wherein the headrest holding frame is located below the axis of the portion or an extension line thereof.   6. The longitudinal extension portion according to claim 1, wherein a circumferential length of the laterally extending central portion is L1, a circumferential length of the lateral end extending portion is L2. Is set to L1 / L2 = 0.75 to 1.25, L2 / L3 = 0.75 to 1.25, L1 / L3 = 0.75 to 1.25. Features headrest holding frame. A first step of preparing a straight material pipe;
By bending the material pipe, a lateral center extending portion disposed in the central region and extending along the lateral direction, and a lateral end extension disposed in the end region and extending along the lateral direction are provided. Forming a bent pipe that includes an installation portion and a longitudinal extension portion that connects the lateral center extension portion and the lateral end extension portion and extends downward or upward. Two steps,
A method for manufacturing a head strike holding frame, comprising sequentially performing a third step of forming an insertion opening for inserting an insertion portion of a headrest into the longitudinally extending portion of the bent pipe.   8. The method of manufacturing a headrest holding frame according to claim 7, wherein in the second step, both end portions in the axial length direction of the bent pipe are formed in a straight shape.   9. The method of manufacturing a headrest holding frame according to claim 7, wherein both ends of the bent pipe in the axial length direction are bent downward after the second step or after the third step.

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