JP2016101776A - Support equipment for headrest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide support equipment for headrest capable of preventing deformation in the inner peripheral shape of a support shaft even if there is deformation, variation of dimension or the like in a bracket.SOLUTION: Support equipment has a pair of brackets 10A, 10B each of which has a circular arc-shaped part 15 and a pair of supports 30A, 30B. The supports 30A, 30B have a head part 31, a shaft part 38 and a retaining pawl 40, respectively. The shaft part 38 has a first thick wall part 41 at a head side and a second thick wall part 42 at a lower end side, and a groove 45 extending along the axial direction of the shaft part 38 is formed on the second thick wall part 42. The groove 45 is formed in a depth which does not penetrate from the outer peripheral face of the second thick wall part 42 into the internal space of the shaft part 38. The opening of the groove part 45 positions at the circular arc-shaped part 15, and the extension direction of at least one of both side walls of the groove 45 crosses with the normal line of the circular arc-shaped part 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a headrest support device that is disposed above a vehicle seat and supports a headrest that supports the head of an occupant.

  A headrest that supports the head of the occupant is disposed above the vehicle seat. There is a demand for adjusting the height of the headrest in accordance with the physique and back of the occupant.

  As a support structure for such a headrest that can be adjusted in height, for example, a metal cylindrical bracket is fixed to the upper part of a seat back frame inside a vehicle seat by welding or the like, and a resin is placed in the bracket. There is known a structure in which a cylindrical support made of steel is inserted and arranged, and a stay extended from below the headrest is slidably inserted into the support.

  By the way, in the said structure, since a support is inserted in a bracket, the internal diameter of a bracket is formed larger than the outer diameter of a support. For this reason, depending on the dimensional accuracy of the inner diameter of the bracket and the variation in the shape of the bracket, if the stay is slid within the support when adjusting the height of the headrest, the support may rattle within the bracket. Sometimes occurred.

  In order to solve the above problem, the following Patent Document 1 includes a pair of brackets and a pair of support main bodies, and a plurality of elastic blades extending in a direction perpendicular to the axial direction are provided on the outer surface of the support main body in the axial direction. The support structure for the headrest is described in which the tip edge of each elastic blade is elastically contacted with the inner surface of the corresponding corner portion of the bracket.

  In this support structure, since the plurality of elastic blades provided on the support body elastically contact the inner surface of the corner of the bracket, rattling of the support body in the bracket is suppressed, and the guide performance of the headrest by the support body is hindered. It becomes difficult.

Japanese Patent No. 3513646

  In the headrest support structure described in Patent Document 1, a plurality of elastic blades provided on the support body are in elastic contact with the corner portion of the bracket. However, when the accuracy of the inner diameter of the bracket is low or the shape variation is large, the elastic blades are strongly pressed against the inner periphery of the bracket, and the inner peripheral shape of the support body is likely to be deformed. There was a possibility that the insertion resistance of the stay at the time would increase or the insertion could not be made smoothly.

  Accordingly, an object of the present invention is to provide a headrest support device capable of suppressing the deformation of the inner peripheral shape of the shaft portion of the support even when the bracket is deformed or has dimensional variations.

  In order to achieve the above object, the present invention provides a pair of brackets that are fixed to a seat back frame of a vehicle seat and have a cross-sectional shape having an arcuate portion, and a pair of brackets that are inserted into and held by the pair of brackets. And a pair of supports that are slidably inserted into a pair of stays extending from the headrest and support the pair of stays, and the support is an insertion port of the stay. Having a head, a cylindrical shaft connected to the head and inserted into the bracket, and a bendable retaining claw that engages with the bracket and prevents the retaining. The shaft portion is provided on the head side with a first thick portion that conforms to the inner periphery of the upper end portion of the bracket, and within the lower end portion of the bracket at a position away from the first thick portion by a predetermined length. The second thick part conforming to the above is provided, and the second thick part is formed with a groove part extending along the axial direction of the shaft part, and the groove part is formed of the second thick part. An opening of the groove portion is formed in a depth not penetrating from the outer peripheral surface into the internal space of the shaft portion, and the second thick portion is perpendicular to the axial direction of the shaft portion. And at least one extending direction of both side walls of the groove portion in the cross section is formed so as to intersect the normal line of the arc-shaped portion.

  In the headrest support device of the present invention, the opening of the groove is located on the opposite side of the axis of the second thick part from the fixing surface of the bracket to the seat back frame. It is preferable that they are arranged close to each other.

  In the headrest support device of the present invention, it is preferable that at least one of the both side walls of the groove is formed to be parallel to a surface of the bracket fixed to the seat back frame.

  In the headrest support device of the present invention, the retaining pawl has an engaging surface that engages with an opening peripheral edge on the lower end side of the bracket, and the pair of groove portions are engaged with the retaining pawl. It is preferable that the shaft portion is formed so as to extend from the lower end side of the shaft portion to the upper end side of the shaft portion beyond the engagement surface.

  According to the present invention, when the pair of supports is inserted into the pair of brackets fixed to the seat back frame, the first thick portion on the upper end side of the shaft portion is adapted to the inner periphery of the upper end portion of the bracket, and The second thick part fits the inner periphery of the lower end of the bracket, and the retaining claws engage with the bracket, and the pair of supports are retained by the pair of brackets. By inserting the stay, the headrest can be supported through the support.

  In this support device, a groove portion extending along the axial direction is formed in the second thick portion of the shaft portion of the support, the opening is located in the arc-shaped portion of the bracket, and in the cross section Since at least one extending direction of both side walls of the groove portion is formed so as to intersect the normal line of the arc-shaped portion, the opening of the groove portion can be provided even if the bracket has deformation or dimensional variation. By deforming so as to be crushed along the circumferential direction of the arcuate portion of the bracket, the deformation and dimensional variation of the bracket can be absorbed on the outer peripheral side of the shaft portion, and the groove portion is formed in the internal space of the shaft portion. Since it is formed with a depth that does not penetrate, it is possible to secure rigidity on the inner peripheral side of the shaft portion and to prevent the inner periphery of the shaft portion from being deformed. As a result, it is possible to suppress a decrease in surface accuracy of the inner periphery of the shaft portion, and it is possible to maintain insertability and guideability when the headrest stay is inserted into the shaft portion.

It is a perspective view which shows one Embodiment of the support apparatus of the headrest which concerns on this invention. (A), (B) is an expansion perspective view of the bracket which comprises the support apparatus. An example of the support which comprises the support apparatus is shown, and it is the expansion perspective view. FIG. 5 is an enlarged perspective view of the support constituting the support device when viewed from a direction different from FIG. 4. It is an expansion perspective view which shows the other example of the support which comprises the support apparatus. It is a front view of the support shown in FIG.3 and FIG.4. FIG. 5 is a left side view of the support shown in FIGS. 3 and 4. It is sectional drawing in the AA arrow line of FIG. 10 in the same support apparatus. It is sectional drawing in the BB arrow line of FIG. 10 in the same support apparatus. It is explanatory drawing at the time of showing the state which made the vehicle seat support the headrest using the support apparatus, and making the support into the cross section.

  Hereinafter, an embodiment of a headrest support device according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a seat back frame 3 is disposed inside the backrest 1 of the vehicle seat, and a pair of stays 7 </ b> A and 7 </ b> B are extended from below the headrest 5. A plurality of lock grooves 8 are formed along the height direction on the outer periphery of the stay 7A.

  As shown in FIGS. 1 and 10, the headrest supporting device includes a pair of cylindrical brackets 10A and 10B fixed to the seat back frame 3 and a pair of stays 7A and 7B of the headrest 5. Is slidably inserted and has a pair of supports 30A and 30B that support the pair of stays 7A and 7B.

  Referring also to FIG. 2, each bracket 10 </ b> A, 10 </ b> B in this embodiment is formed in a cylindrical shape by appropriately bending a metal plate material and butting its ends.

  Each of the brackets 10A and 10B has a flat fixed surface 11 on the abutting surface side between the end portions, and both side surfaces 12 and 12 are bent at a right angle with respect to the fixed surface 11, and the fixed surface 11 is further fixed. The opposite surface 13 is formed in a substantially rectangular tube shape, and both corners of the opposite surface 13 are arcuate portions 15, 15 rounded in an R shape. As shown in FIGS. 8 and 9, both corner portions 14 and 14 of the fixed surface 11 are also rounded, but are more rounded than the arcuate portions 15 and 15 of the opposite surface 13. ing.

  As described above, the brackets 10A and 10B have arcuate portions 15 and 15 in which both corners of the opposite surface 13 with respect to the fixed surface 11 form an R shape, as shown in FIGS. It is formed in a rectangular cylinder shape having a cross-sectional shape. Moreover, the notch part 11a is each formed in the position adjacent to the butt | matching part above the fixed surface 11 side of each bracket 10A, 10B.

  And each bracket 10A, 10B is being fixed to the seat back frame 3 by joining the fixed surface 11 to the said seat back frame 3 by welding etc. (refer FIG. 1). The brackets 10A and 10B of this embodiment are fixed to the front surface of the seat back frame 3 (see FIG. 1). The seat back frame 3 and the brackets 10 </ b> A and 10 </ b> B are covered with an internal cushion material or a skin material of the backrest 1.

  Next, the pair of supports 30A and 30B will be described. The support 30A is inserted and held in the bracket 10A and slidably supports the stay 7A, and the support 30B is inserted and held in the bracket 10B and slidably supports the stay 7B.

  The support 30A has a structure capable of locking the stay 7A having the lock groove 8 so that the height can be adjusted, and the support 30B does not have such a structure. However, since the other structures are common to both the supports 30A and 30B, the same reference numerals are given and description thereof is omitted.

  As shown in FIGS. 3 to 5, each support 30 </ b> A, 30 </ b> B has a head portion 31 in which an insertion port 32 for stays 7 </ b> A, 7 </ b> B is formed. The head 31 is formed in a substantially square shape with an outer peripheral surface having a curved surface, and is arranged on the front side of a mounting hole (not shown) above the vehicle seat 1 (see FIG. 10).

  As shown in FIG. 3, the head 31 of the support 30 </ b> A has a slot 33 communicating with the insertion port 32 on one side surface, and the lock release member 35 is slidably disposed in the slot 33.

  Further, on the base end side of the unlocking member 35, a lock portion 36 that engages and disengages with the lock groove 8 of the stay 7A is provided (see FIG. 3). The lock portion 36 is normally biased inward. When the stay 7A is inserted, the lock portion 36 is sequentially fitted into the lock groove 8 of the stay 7A, and when the insertion of the stay 7A is stopped at a desired height, The headrest 5 is held at a desired height by fitting in a lock groove 8 in the vicinity to stop the movement of the stay 7A.

  The unlocking member 35 is always urged in a direction away from the entrance of the slot 33 by an urging means (not shown), and is pushed into the slot 33 against the urging means. The lock portion 36 is unlocked, and the stay A can be moved in the pulling direction.

  A cylindrical shaft portion 38 extends from the back side periphery of the insertion port 32 of the head portion 31. The shaft portion 38 has a substantially cylindrical shape. However, as shown in FIGS. 3 and 5, the surface 38a of the shaft portion 38 opposite to the fixed surface 11 of the brackets 10A and 10B (hereinafter referred to as “the opposite surface”). 38a ") is formed in a planar shape.

  As shown in FIGS. 3 to 7, on the lower end side of the shaft portion 38 away from the head 31 and on both sides 38b and 38b of the opposite surface 38a (hereinafter referred to as “both side surfaces 38b and 38b”). Are formed with bending-proof retaining claws 40, 40 through U-shaped slits 39, respectively. Each retaining claw 40 has an inclined stepped engagement surface 40a formed at the upper end thereof, and the engagement surface 40a engages with the opening peripheral edge on the lower end side of the brackets 10A and 10B. (See FIG. 10). Each retaining pawl 40 has an outer surface shape whose height gradually decreases from the engagement surface 40a toward the lower end side, and the workability of inserting the supports 30A and 30B into the brackets 10A and 10B is enhanced. ing.

  In addition, a first thick portion 41 adapted to the inner periphery of the upper end portions of the brackets 10A and 10B is provided at the upper end portion of the shaft portion 38 on the head portion 31 side. Furthermore, a second thick portion 42 adapted to the inner periphery of the lower ends of the brackets 10 </ b> A and 10 </ b> B is provided at a position away from the first thick portion 41 of the shaft portion 38 by a predetermined length, here the lower end portion of the shaft portion 38. Is provided. In the present invention, “adaptation” means a gap between the outer peripheral shape of the first thick portion 41 or the outer peripheral shape of the second thick portion 42 and the inner peripheral shape of the upper end portion or the lower end portion of the brackets 10A and 10B. This means that the first thick portion 41 or the second thick portion 42 is well applied to the upper end portion or the lower end portion of the brackets 10A and 10B.

  First, the second thick portion 42 and the related structure will be described.

  As shown in FIGS. 3 to 5 and 8, the second thick portion 42 in this embodiment includes a wall portion 43 adapted to the inner circumference of the arc-shaped portions 15 and 15 of the brackets 10 </ b> A and 10 </ b> B, and the brackets 10 </ b> A and 10 </ b> B. Projecting portions 44 and 44 adapted to the inner peripheries of both corner portions 14 and 14 of the fixed surface 11.

  As shown in FIGS. 3 and 5, the wall portion 43 has a width reaching the opposite surface 38 a and both side surfaces 38 b and 38 b of the shaft portion 38, and protrudes in the outer diameter direction at a predetermined height from the outer peripheral surface of the shaft portion 38. In addition, it has a wide plate shape and extends so as to reach the lower end of the shaft portion 38. Further, both side portions 43a and 43a in the width direction of the wall portion 43 have rounded curved surfaces so as to fit the inner circumferences of the arc-shaped portions 15 and 15 (see FIG. 8) of the brackets 10A and 10B. .

  On the other hand, as shown in FIG. 4, the protrusions 44, 44 have a wall surface (wall surface on the opposite side of the wall portion 43) and both side surfaces 38 b, 38 b of the shaft portion 38 located on the fixed surface 11 side of the brackets 10A, 10B. And is provided at a position closer to the head 31 side than the engagement surface 40a of the retaining claw 40 so as to protrude in the outer diameter direction from the outer peripheral surface of the shaft portion 38. Further, the outer surfaces of these protrusions 44, 44 have a substantially right-angled shape with the intermediate portions chamfered so as to fit the inner circumferences of both corner portions 14, 14 of the fixing surface 11 of the brackets 10A, 10B. .

  Note that, as described above, the second thick portion 42 in this embodiment includes the wide plate-like wall portion 43 and the pair of protrusions 44, 44. For example, the second thick portion 42 includes a pair of protrusions 44, 44. Instead, a wide plate-like wall portion similar to the wall portion 43 may be provided, and the structure of the second thick portion 42 is not particularly limited.

  A first groove portion 45 extending along the axial direction of the shaft portion 38 is formed in the second thick portion 42. The first groove 45 is formed with a depth that does not penetrate from the outer peripheral surface of the second thick portion 42 into the internal space of the shaft portion 38.

  Moreover, in this embodiment, as shown in FIG.3 and FIG.5-8, it is the wall part 43 which comprises the 2nd thick part 42, Comprising: The inner periphery of the circular arc shaped parts 15 and 15 of bracket 10A, 10B 1st groove parts 45 and 45 are formed in width direction both side parts 43a and 43a which are parts which fit to, respectively.

  Further, as shown in FIGS. 3 and 5 to 7, each first groove portion 45 extends from the lower end side of the shaft portion 38 with respect to the engagement surface 40 a of the retaining claw 40 beyond the engagement surface 40 a to the shaft portion. It is formed to extend to the upper end side of 38.

  Moreover, as shown in FIG. 8, the 1st groove part 45 is a groove | channel formed in the concave shape so that the side walls 46 and 47 may become mutually parallel.

  Then, as shown in FIG. 8, in the cross section of the second thick part 42 perpendicular to the axial direction of the shaft part 38, the opening of each first groove part 45 is located in the arcuate part 15 of the brackets 10A and 10B. In addition, at least one extending direction of both side walls 46 and 47 of the first groove 45 in the cross section is formed to intersect the normal line N of the arcuate portion 15.

  Note that “crossing the normal line” means that the side wall 46 or the side wall of the first groove portion 45 with respect to all the normal lines N existing in a plurality of arcuate portions 15 of the brackets 10A and 10B, as shown in FIG. 47 means to intersect.

  In this embodiment, the side walls 46 and 47 of the first groove 45 are normal to the arcuate portion 15 of the brackets 10A and 10B in the cross section perpendicular to the axial direction of the shaft portion 38 of the second thick portion 42. The brackets 10A and 10B are formed so as to be parallel to the fixing surface of the brackets 10A and 10B to the seat back frame 3, and have a substantially U-shaped cross-sectional shape. (See FIG. 8).

  Further, in this embodiment, as shown in FIG. 8, the opening of the first groove portion 45 is formed so that the brackets 10 </ b> A and 10 </ b> B are attached to the seat back frame 3 with respect to the axis C of the second thick portion 42. The fixed surface 11 is disposed closer to the wall 43 located on the opposite side.

  The first groove 45 constitutes a “groove” in the present invention. Moreover, although the two 1st groove parts 45 of this embodiment are formed, 1 piece or 2 or more may be sufficient and it does not specifically limit. Further, in the first groove 45, both the side walls 46 and 47 have a method of the arcuate portion 15 of the brackets 10A and 10B in the cross section perpendicular to the axial direction of the shaft portion 38 of the second thick portion 42. Although it is formed so as to intersect the line N, it is sufficient that at least one of the side walls 46 and 47 intersects the normal line N of the arcuate part 15. For example, the cross-sectional shape of the first groove part 45 is approximately Both side walls may be formed so as to exhibit a V shape or a substantially U shape, and is not particularly limited.

  Moreover, as shown in FIGS. 3-7, it is a both-sides wall of the 2nd thick part 42 by the side surfaces 38b and 38b side of the axial part 38, Comprising: The head rather than the engaging surface 40a of the said retaining claw 40 From the position on the 31st side, ribs 49, 49 are formed so as to project along the axial direction of the shaft portion 38.

  Further, as shown in FIG. 4, the shaft portion 38 is a wall portion located on the fixing surface 11 side of the brackets 10 </ b> A and 10 </ b> B, and the axial direction of the shaft portion 38 is between the pair of protrusions 44 and 44. The rib 50 which made the protrusion extended along is protruded. The rib 50 is formed at a position substantially aligned with the ribs 49, 49 in the circumferential direction.

  As shown in FIGS. 3 to 6, ribs 51, 51 are extended from the pair of protrusions 44, 44 toward the lower end side of the shaft portion 38.

  As shown in FIG. 8, the ribs 49, 49, 51, 51 abut against the inner circumferences of both side surfaces 12, 12 of the brackets 10A, 10B, and the ribs 50 are fixed surfaces 11 of the brackets 10A, 10B. The backlash of the supports 30A and 30B with respect to the brackets 10A and 10B is suppressed.

  As shown in FIGS. 3 to 5 and FIG. 7, a substantially U-shaped second groove 52 is formed on the outer periphery of each rib 49. The second groove portion 52 is formed in a concave shape with a depth that does not penetrate the inner space of the shaft portion 38 from the outer peripheral surface of the shaft portion 38.

  In this embodiment, the second thick portion 42 is provided on the lower end side of the shaft portion 38, but may be provided in the middle of the shaft portion 38 in the axial direction, and is not particularly limited. Further, the above-described ribs 49, 50, 51 for suppressing backlash need not be provided.

  Next, the 1st thick part 41 provided in the upper end part side of the axial part 38, and the structure relevant to it are demonstrated.

  As shown in FIGS. 3 to 5 and FIG. 9, the first thick portion 41 in this embodiment is provided on the opposite surface 38 a side of the shaft portion 38 and abuts on the inner periphery of the opposite surface 13 of the brackets 10 </ b> A and 10 </ b> B. The wall portion 53, the wall portions 54 and 54 provided on the both side surfaces 38b and 38b side of the shaft portion 38 and abutting against the inner periphery of the both side surfaces 12 and 12 of the brackets 10A and 10B, and the bracket 10A, It is provided on the wall surface located on the fixed surface 11 side of 10B, and has a wall portion 55 that contacts the inner periphery of the fixed surface 11 of the brackets 10A and 10B. These wall portions 53, 54, and 55 protrude in the outer diameter direction from the outer peripheral surface of the shaft portion 38.

  Furthermore, a plurality of rib-like protrusions 56 extending along the circumferential direction are formed between the wall portion 53 and the wall portions 54 and 54 of the shaft portion 38 along the axial direction of the shaft portion 38 ( (See FIGS. 3, 5 and 6). The rib-shaped protrusion 56 protrudes in the outer diameter direction from the outer peripheral surface of the shaft portion 38, and the outer surface thereof is rounded so as to fit the inner periphery of the arc-shaped portions 15 and 15 of the brackets 10A and 10B. It has a curved surface shape (see FIG. 9).

  On the other hand, a plurality of rib-like protrusions 57 extending along the circumferential direction are also formed between the wall portion 55 and the wall portions 54 and 54 of the shaft portion 38 along the axial direction of the shaft portion 38 ( (See FIG. 4). The rib-shaped protrusion 57 protrudes in the outer diameter direction from the outer peripheral surface of the shaft portion 38, and the outer surface thereof is shaped to fit the inner periphery of both corner portions 14, 14 of the fixed surface 11 of the brackets 10A, 10B. (See FIG. 9).

  As shown in FIGS. 3 to 8, a third groove 58 extends between the rib-shaped protrusions 56, 56 and between the rib-shaped protrusions 57, 57 along the circumferential direction of the shaft portion 38. Are formed respectively. The third groove portion 58 is formed in a concave shape with a depth that does not penetrate the inner space of the shaft portion 38 from the outer peripheral surface of the shaft portion 38.

  As shown in FIGS. 4 and 7, a positioning protrusion 59 is provided on the wall surface of the first thick portion 41 located on the fixed surface 11 side of the brackets 10 </ b> A and 10 </ b> B. When the supports 30A and 30B are inserted into the brackets 10A and 10B, the positioning protrusions 59 enter the brackets 10A and 10B cutout portions 11a to position and prevent the supports 30A and 30B from rotating relative to the brackets 10A and 10B. Is for.

  Next, the usage method and the effect of the headrest support device having the above structure will be described.

  That is, as shown in FIG. 1, the positioning projection 59 of the support 30A is aligned with the notch 11a of the bracket 10A fixed to the seat back frame 3, and the shaft portion 38 of the support 30A is opened from the upper opening of the bracket 10A. Is inserted from the lower end side.

  Then, a pair of retaining claws 40, 40 are pressed and bent on the inner periphery of the bracket 10A, and as shown in FIG. 8, both side portions 43a, 43a of the wall portion 43 of the second thick portion 42 are The brackets 10A are in contact with the inner peripheries of the arcuate portions 15 and 15, the protrusions 44 and 44 of the second thick part 42 are in contact with the inner peripheries of both corners 14 and 14 of the bracket 10A, and the support 30A is a guide. It is pushed in (see FIG. 8).

  When the support 30A is further pushed into the bracket 10A, the rib-like protrusions 56, 56 of the first thick part 41 come into contact with the inner circumferences of the arcuate parts 15, 15 of the bracket 10A, and the first wall The rib-like protrusions 57, 57 of the thick portion 41 abut against the inner circumferences of both corner portions 14, 14 of the bracket 10A, and the support 30A is guided (see FIG. 9).

  When the engagement surfaces 40a of the retaining claws 40 come out of the opening on the lower end side of the bracket 10A, the pair of retaining claws 40, 40 are elastically restored, and the engagement surfaces 40a, 40a are moved to the bracket 10A. Is engaged with the peripheral edge of the opening on the lower end side (see FIG. 10).

  In this state, as shown in FIG. 8, both side portions 43a and 43a of the wall portion 43 of the second thick portion 42 come into contact with the inner periphery of the arcuate portions 15 and 15 of the bracket 10A, and the protrusions 44 and 44 However, the ribs 49, 49, 51, 51 are in contact with the inner peripheral surfaces of both side surfaces 12, 12 of the bracket 10A, and the ribs 50 are in contact with the bracket 10A. It contacts the inner peripheral surface of the fixed surface 11.

  Further, as shown in FIG. 9, the rib-like protrusions 56, 56 of the first thick part 41 abut on the inner circumference of the arc-shaped parts 15, 15 of the bracket 10A, and the rib-like protrusions 57, 57 are While abutting on the inner periphery of both corners 14 and 14 of the bracket 10A, the wall 53, the walls 54 and 54, and the wall 55 are the inner periphery of the opposite surface 13 of the bracket 10A, the inner periphery of both side surfaces 12 and 12, Each abuts against the inner periphery of the fixed surface 11.

  As a result, the first thick portion 41 supports the upper end side of the shaft portion of the support 30A on the inner periphery of the upper end portion of the bracket 10A, and the second thick portion 42 causes the lower end portion of the shaft portion of the support 30A to be within the upper end portion of the bracket 10A. The support 30A can be held in a state in which the support 30A is prevented from being detached from the bracket 10A (see FIG. 10).

  Similarly to the above, the support 30B can be held in the bracket 10B in a state of being prevented from coming off by inserting and pushing the support 30B into the bracket 10B.

  Then, the stays 7A and 7B of the headrest 5 are respectively inserted into the upper portions of the vehicle seat 1 from the insertion ports 32 of the head 31 of the pair of supports 30A and 30B held by the pair of brackets 10A and 10B. The headrest 5 can be supported via the supports 30A and 30B.

  By the way, a dimensional variation and shape deformation may arise in a pair of bracket 10A, 10B. In particular, the brackets 10A and 10B of this embodiment are formed in a rectangular cylindrical shape by bending a metal plate material, so that the above-described dimensional variation and shape deformation are likely to occur. In such a case, when the shaft portions 38 of the supports 30A and 30B are inserted into the brackets 10A and 10B, the shaft portion 38 is pressed against the inner periphery of the bracket, and the inner periphery of the shaft portion 38 is deformed or the surface accuracy is affected. It may be difficult to insert the stays 7A and 7B of the headrest 5 into the shaft portions 38 of the supports 30A and 30B, or the guides of the stays 7A and 7B by the supports 30A and 30B may be hindered. .

  However, in this support device, as shown in FIG. 8, in the cross section perpendicular to the axial direction of the shaft portion 38 of the second thick portion 42, the opening of each first groove portion 45 is formed in the brackets 10A and 10B. It is located in the arcuate part 15 and is formed so that at least one extending direction of both side walls 46 and 47 of the first groove part 45 in the cross section intersects the normal line N of the arcuate part 15. Yes.

  Therefore, even if the brackets 10A and 10B have dimensional variation, shape deformation, and the like, as shown by an arrow F in FIG. 8, the opening of the first groove 45 is in the circumferential direction of the arcuate portions 15 and 15 of the brackets 10A and 10B. The deformation of the brackets 10A and 10B, variation in dimensions, and the like can be absorbed on the outer peripheral side of the shaft portion 38, and the first groove portion 45 has the second thick portion. Since it is formed with a depth that does not penetrate from the outer peripheral surface of the shaft portion 38 to the internal space of the shaft portion 38, the rigidity of the inner peripheral side of the shaft portion 38 can be secured, and the inner periphery of the shaft portion 38 is deformed. As a result, a decrease in surface accuracy of the inner periphery of the shaft portion 38 can be suppressed, and the insertability and guideability when the stays 7A and 7B of the headrest 5 are inserted into the shaft portion 38 can be reduced. Can be maintained.

  Further, as described above, the brackets 10A and 10B are formed in a cylindrical shape by bending a metal plate material, but the fixing surface 11 side to the seat back frame 3 is accurately formed in a shape suitable for the seat back frame 3. However, deformation and dimensional variation often occur on the opposite surface 13 side of the fixed surface 11. In this embodiment, as shown in FIG. 8, the opening of the first groove portion 45 is a fixed surface of the brackets 10 </ b> A and 10 </ b> B to the seat back frame 3 with respect to the axis C of the second thick portion 42. 11 is disposed closer to the wall portion 43 located on the opposite side, so that it is possible to effectively absorb the deformation and dimensional variation of the brackets 10A and 10B.

  Further, as shown in FIG. 8, at least one of the both side walls 46 and 47 of the first groove portion 45 in this embodiment, here both the side walls 46 and 47 are both fixed surfaces of the brackets 10A and 10B to the seat back frame 3. Are formed so as to be parallel to each other. Therefore, when the brackets 10A and 10B have dimensional variation, shape deformation, or the like, the opening of the first groove 45 is easily deformed and deformed along the circumferential direction of the arcuate portions 15 and 15 of the brackets 10A and 10B. Therefore, it is possible to more effectively absorb the deformation and dimensional variation of the brackets 10A and 10B.

  In this embodiment, the brackets 10A and 10B are prone to deformation and dimensional variations, and both corners on the opposite surface 13 side of the fixing surface 11 with respect to the seat back frame 3 are rounded in an arc shape. 15 and 15 (see FIGS. 2 and 8), and the first groove 45 is located at a position of the support 30A, 30B second thick part 42 corresponding to the arcuate parts 15, 15 respectively. It is formed (see FIG. 8). Therefore, the deformation and dimensional variation of the brackets 10A and 10B can be absorbed more effectively, and the stays 7A and 7B of the headrest 5 are inserted while suppressing the twist and inclination of the supports 30A and 30B with respect to the brackets 10A and 10B. Insertability and guideability can be maintained.

  Further, in this embodiment, each first groove portion 45 is located on the upper end side of the shaft portion 38 from the lower end side of the shaft portion 38 beyond the engagement surface 40a of the retaining claw 40 and beyond the engagement surface 40a. It is formed to extend (see FIG. 3 and FIGS. 5 to 7). Therefore, not only when the shaft portions 38 of the supports 30A and 30B are inserted into the brackets 10A and 10B, but also when the shaft portions 38 of the supports 30A and 30B are inserted and the attachment is completed, the first groove 45 is formed in the bracket 10A. 10B, the deformation of the brackets 10A and 10B and the dimensional variation after the mounting of the supports 30A and 30B is completed, and the deformation of the shaft portion 38 of the supports 30A and 30B can be suppressed. .

  In this embodiment, as shown in FIGS. 3 to 5 and 7, the outer periphery of the ribs 49 and 49 formed on both side walls of the second thick portion 42 of the supports 30 </ b> A and 30 </ b> B is substantially The second groove portions 52 and 52 are formed to have a letter shape and have a depth that does not penetrate the inner space of the shaft portion 38 from the outer peripheral surface of the shaft portion 38.

  Therefore, when the shaft portions 38 of the supports 30A and 30B are inserted into the brackets 10A and 10B, the portions where the second groove portions 52 and 52 of the second thick portion 42 are formed are easily bent, and the brackets 10A and 10B. The insertion resistance of the supports 30A and 30B with respect to is reduced, and can be held smoothly.

  Further, since the second groove portion 52 is provided on the outer periphery of the rib 49, even if the rib 49 is pressed as shown by the arrow G in FIG. 8 due to deformation or dimensional variation in the brackets 10A and 10B, Since the thin-walled portion provided with the second groove portion 52 is difficult to be pressed, it is possible to suppress the influence due to the deformation or dimensional variation of the brackets 10A and 10B.

  Furthermore, in this embodiment, as shown to FIGS. 3-8, between the rib-shaped protrusions 56 and 56 and between the rib-shaped protrusions 57 and 57 of the 1st thick part 41 of support 30A, 30B. Are formed with third groove portions 58 extending along the circumferential direction of the shaft portion 38.

  The effect by this is as follows.

  That is, when the shaft portions 38 of the supports 30A and 30B are inserted into the brackets 10A and 10B, the first thick portion 41 is finally inserted into the brackets 10A and 10B. When the cylindricity and the coaxiality of the inner circumference on the upper end side vary with respect to the inner circumference on the lower end side of 10B, or when the shaft portion 38 is inserted inclined with respect to the brackets 10A and 10B. Are attached to the corners 14 and 14 of the fixed surface 11 of the brackets 10A and 10B, and the arcuate portions 15 and 15 on the opposite side, to the rib-like projections 57 and 57 of the supports 30A and 30B, the rib-like projections 56, 56 is strongly pressed (see FIG. 9).

  Even in such a case, in this embodiment, since the third groove portion 58 extending along the circumferential direction of the shaft portion 38 is provided, the rib-like protrusion 57 and the rib-like protrusion 56 are strongly pressed. However, since the thin portion of the shaft portion 38 provided with the third groove portion 58 is difficult to be pressed (see the arrow H in FIG. 9), it is possible to suppress the influence of the deformation of the brackets 10A and 10B, dimensional variations, and the like.

DESCRIPTION OF SYMBOLS 1 Vehicle seat back 3 Seat back frame 5 Headrest 7A, 7B Stay 10A, 10B Bracket 11 Fixed surface 13 Opposite surface 15 Arc-shaped part 30A, 30B Support 31 Head 32 Insertion port 38 Shaft part 40 Retaining claw 40a Engagement surface 41 1st thick part 42 2nd thick part 43 Wall part 45 1st groove part (groove part)
46, 47 side wall

Claims (4)

A pair of brackets that are fixed to a seat back frame of a vehicle seat and have a cross-sectional shape having an arc-shaped portion, and a pair of brackets that are inserted and held in the pair of brackets and that extend from the headrest A headrest support device having a pair of supports in which a stay is slidably inserted and supports the pair of stays,
The support includes a head having an insertion opening for the stay, a cylindrical shaft portion connected to the head and inserted into the bracket, and a flexible pull-out that engages with the bracket to prevent the stay from coming off. Has a pawl and
The shaft portion is provided on the head side with a first thick portion that conforms to the inner periphery of the upper end portion of the bracket, and within the lower end portion of the bracket at a position away from the first thick portion by a predetermined length. A second thick part that fits around the circumference is provided,
A groove portion extending along the axial direction of the shaft portion is formed in the second thick portion,
The groove portion is formed at a depth that does not penetrate through the inner space of the shaft portion from the outer peripheral surface of the second thick portion,
In the cross section of the second thick portion perpendicular to the axial direction of the shaft portion, the opening of the groove portion is located in the arc-shaped portion of the bracket, and at least one of both side walls of the groove portion in the cross section The headrest supporting device is characterized in that the extending direction of the headrest intersects with the normal line of the arcuate portion.   2. The opening of the groove portion is disposed closer to a wall portion located on the opposite side of the axis of the second thick portion than the fixing surface of the bracket to the seat back frame. Headrest support device.   The headrest support device according to claim 2, wherein at least one of both side walls of the groove portion is formed to be parallel to a fixing surface of the bracket to the seat back frame. The retaining pawl has an engaging surface that engages with an opening peripheral edge on the lower end side of the bracket,
The pair of groove portions are formed so as to extend from the lower end side of the shaft portion to the upper end side of the shaft portion from the lower end side of the shaft portion with respect to the engagement surface of the retaining claw. 4. The headrest support device according to any one of 3 above.