JP2019038338A - Headrest support device - Google Patents

Abstract

To provide a headrest support device which decreases a rotation speed of a headrest without causing enlargement of the device.SOLUTION: A headrest support device 20 is used to support a headrest on a seat back frame 2 and includes: a support member 22 provided at the seat back frame; a rotation member 21 including a rotation shaft part 25 extending to left and right sides and rotatably supported by the support member, and connection parts 26 extending substantially perpendicularly from the rotation shaft part and coupled to the headrest; a biasing member which biases the rotation shaft part relative to the support member in one rotation direction; a support member side engagement member 60 which is provided at the support member and selectively engages with the rotation shaft part to restrict rotation of the rotation shaft part; a protrusion part 51 protruding from the rotation shaft part in a radial direction; and a flexible slide contact part 71 which is provided at the support member and slidably contacts with a tip of the protrusion part.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicle headrest support device, and more particularly to a device that supports a headrest so that the angle of the headrest can be changed with respect to a seat back.

  In a vehicle seat, a headrest support device that supports a headrest so that the angle of the headrest can be changed is known (for example, Patent Document 1). A headrest support device according to Patent Document 1 is provided with a support member provided on a seat back frame, a headrest pillar coupled to the headrest and rotatably supported by the support member, and a biasing force for biasing the headrest pillar in the storage direction. It has a biasing member and a rotation restricting member that is provided on the support member and restricts the rotation of the headrest pillar by selectively locking the headrest pillar. When the locking of the headrest pillar by the rotation restricting member is released by the operation of the occupant, the headrest pillar and the headrest are moved to the non-use position by the urging force of the urging member.

JP 2017-30619 A

  By relaxing the rotation speed when the headrest rotates, a high-class feeling can be given to the seat. The rotational speed of the headrest can be damped, for example, by providing a viscous fluid damper between the support member and the headrest pillar. However, when the viscous fluid damper is provided, it is necessary to secure a space for providing the viscous fluid damper on the support member, which causes a problem that the apparatus is increased in size. There is also a problem that the cost increases.

  In view of the above background, it is an object of the present invention to reduce the rotational speed of a headrest without increasing the size of the headrest support device.

  In order to solve the above problems, one aspect of the present invention is a headrest support device (20) for supporting a headrest (24) on a seatback frame (2), the support provided on the seatback frame. A member (22), a rotation shaft portion (25) extending left and right and rotatably supported by the support member, and a connecting portion (26) extending substantially perpendicularly from the rotation shaft portion and coupled to the headrest ), A urging member (56) for urging the rotation shaft portion in one rotation direction with respect to the support member, and the rotation member. A supporting member side locking member (60) for restricting the rotation of the rotating shaft portion by selectively locking the shaft portion, and a protrusion (51) projecting radially from the rotating shaft portion And provided on the support member and in sliding contact with the tip of the protrusion. Providing headrest supporting apparatus characterized by having the sliding portion of the flexible and (71).

  According to this aspect, the rotation of the rotating member can be moderated by the friction between the protrusion and the sliding contact portion. Since the rotation of the rotating member can be damped by a simple configuration of the protrusion and the sliding contact portion, it is possible to avoid an increase in the size of the headrest support device.

  In the above aspect, the support member has a hollow inner chamber (38), and the rotation shaft portion, the biasing member, and the protrusion are disposed in the inner chamber, and the sliding contact portion Is preferably formed on the inner chamber wall surface (70) defining the inner chamber.

  According to this aspect, an increase in the size of the headrest support device can be avoided. Moreover, since the protrusion and the sliding contact portion are disposed in the inner chamber, it is possible to prevent the foreign matter from being caught between the protrusion and the sliding contact portion.

  Said aspect WHEREIN: The said sliding contact part is good to protrude toward the said rotating shaft part from the said inner chamber wall surface.

  According to this aspect, the sliding contact portion can be provided on the support member with good stability. Moreover, the arrangement space of the sliding contact portion can be reduced.

  Said aspect WHEREIN: The said sliding contact part is good to extend in the circumferential direction centering on the said rotating shaft part.

  According to this aspect, the slidable contact range between the protrusion and the slidable contact portion can be increased, and the range in which the rotating member can be rotated slowly can be increased.

  In the above aspect, a plurality of the sliding contact portions may be provided, and each of the sliding contact portions may be disposed apart from each other in a circumferential direction around the rotation shaft portion.

  According to this aspect, each slidable contact portion can be made small, and each slidable contact portion can be easily deformed when coming into contact with the protrusion. Thereby, a rotation member can be rotated smoothly. Moreover, the range which decelerates a rotation member can be enlarged.

  Said aspect WHEREIN: The said sliding contact part is good to have a part which overlaps with the rotation locus | trajectory of the said protrusion.

  According to this aspect, the protrusion and the slidable contact portion are reliably slidably contacted.

  Said aspect WHEREIN: The said protrusion has a core material (51A) and the surface material (51B) which is provided in the surface of the said core material, and has higher flexibility than the said core material, In the said surface material, The sliding contact portion may be slidably contacted.

  According to this aspect, the protrusion can reliably contact the sliding contact portion, and can slide on the surface of the sliding contact portion when the surface material is deformed.

  Said aspect WHEREIN: The said inner chamber wall surface is good to have a through-hole or a thin part (101) around the said sliding contact part.

  According to this aspect, since the sliding contact portion can be displaced by the through hole or the thin wall portion, the protrusion can smoothly slide on the surface of the sliding contact portion.

  Said aspect WHEREIN: The said rotation shaft part has a plate-shaped rotation member side latching member (50) which protruded to radial direction outward, and the outer peripheral part of the said rotation member side latching member has the following. Locking grooves (50A, 50B) into which the support member-side locking member is selectively fitted are recessed, and the protrusion is preferably protruded.

  According to this aspect, the protrusion can be provided on the locking member that engages with the support member side locking member, and the space for providing the protrusion can be reduced.

  In the above aspect, the rotating member rotates between a first position where the headrest is positioned at a use position and a second position where the headrest is positioned at a non-use position. The rotating member is urged toward the second position, and the sliding contact portion is in a position that does not slide into contact with the protrusion when the rotating member is in the first position and the second position. It should be provided.

  According to this aspect, only when the rotating member rotates, the projecting portion and the sliding contact portion are in sliding contact, and a frictional resistance can be generated.

  In the above aspect, the sliding contact portion may be provided at a position where the sliding member can be slidably contacted with the protruding portion when the rotating member is located on the first position side from the intermediate position in the rotation range.

  According to this aspect, a frictional force can be applied from the early stage of rotation when the urging force of the urging member is large, and an increase in the rotation speed of the rotation member can be suppressed.

  According to this aspect, the rotation of the rotating member can be moderated by the friction between the protrusion and the sliding contact portion. Since the rotation of the rotating member can be damped by a simple configuration of the protrusion and the sliding contact portion, it is possible to avoid an increase in the size of the headrest support device.

  According to the aspect in which the rotation shaft portion, the urging member, and the protrusion are arranged in the inner chamber and the sliding contact portion is formed on the inner chamber wall surface, it is possible to avoid an increase in the size of the headrest support device. Moreover, since the protrusion and the sliding contact portion are disposed in the inner chamber, it is possible to prevent the foreign matter from being caught between the protrusion and the sliding contact portion.

  According to the aspect in which the sliding contact portion protrudes from the inner chamber wall surface toward the rotating shaft portion, the sliding contact portion can be provided on the support member with good stability. Moreover, the arrangement space of the sliding contact portion can be reduced.

  According to the aspect in which the sliding contact portion extends in the circumferential direction around the rotation shaft portion, the sliding contact range between the protrusion and the sliding contact portion is lengthened, and the range in which the rotation member gently rotates is set. Can be long.

  According to the aspect in which a plurality of sliding contact portions are provided, and each of the sliding contact portions is arranged away from each other in the circumferential direction around the rotation shaft portion, each sliding contact portion can be made small, Each contact portion can be easily deformed when contacted. Thereby, a rotation member can be rotated smoothly. Moreover, the range which decelerates a rotation member can be enlarged.

  According to the aspect in which the sliding contact portion has a portion that overlaps the rotation trajectory of the protrusion, the protrusion and the sliding contact portion are reliably in sliding contact.

  According to the aspect in which the protrusion has a core material and a surface material that is provided on the surface of the core material and is more flexible than the core material, and the surface material is in sliding contact with the sliding contact portion, the protrusion is in sliding contact Can be reliably brought into contact with the portion, and can be slid on the surface of the sliding contact portion by deformation of the surface material.

  According to the aspect in which the inner chamber wall surface has the through hole or the thin wall portion around the sliding contact portion, the sliding contact portion can be displaced by the through hole or the thin wall portion, so that the protrusion is smoothly on the surface of the sliding contact portion. Can slide.

  According to the aspect in which the locking groove into which the support member side locking member is selectively fitted is recessed in the outer peripheral portion of the rotating member side locking member, and the protrusion is protruded, the support member side engagement The protrusion can be provided on the rotating member side locking member that engages with the stop member, and the space for providing the protrusion can be reduced.

  According to the aspect in which the sliding contact portion is provided at a position where the sliding member is not in sliding contact with the protruding portion when the rotating member is in the first position and the second position, the protruding portion and the sliding contact portion only when the rotating member rotates. The sliding contact portion can be slid to generate frictional resistance.

  According to the aspect in which the slidable contact portion is provided at a position where the slidable contact portion can be slidably contacted with the protrusion when the rotating member is located on the first position side from the intermediate position in the rotational range, A frictional force can be applied from the beginning of a large rotation, and an increase in the rotation speed of the rotation member can be suppressed.

The perspective view which looked at the principal part of the vehicle seat provided with the headrest support device concerning a 1st embodiment from the front. The perspective view which looked at the headrest support device concerning a 1st embodiment from the front. The perspective view which looked at the headrest support device of the state where the 2nd member was removed from the front The perspective view which looked at the principal part of the vehicle seat provided with the headrest support device concerning a 1st embodiment from back. V-V cross section of Fig. 2 VI-VI cross section of FIG. Sectional drawing of the headrest support apparatus which concerns on 2nd Embodiment. Sectional drawing of the headrest support apparatus which concerns on 3rd Embodiment.

  Hereinafter, an embodiment of a headrest support device of the present invention will be described with reference to the drawings. The headrest support device according to the present embodiment is used to attach a headrest to a seat back of a vehicle seat.

(First embodiment)
As shown in FIG. 1, the seat back 1 is formed by covering a seat back frame 2 as a skeleton with a pad and an outer skin. The seat back frame 2 includes a pair of left and right side frames 3 that extend vertically, a first upper frame 4 that connects the upper ends of the side frames 3, and a first frame that connects the left and right side frames 3 below the first upper frame 4. 2 upper frames 5. The upper portions of the left and right side frames 3 and the frame main body portion 4A of the first upper frame 4 are formed from a single bent pipe member. The front portion of the central portion in the left-right direction of the frame main body portion 4A of the first upper frame 4 is deformed so as to form a flat portion facing forward.

  As shown in FIGS. 1 to 4, a pair of left and right first brackets 7 are welded to the plane portion of the frame main body portion 4 </ b> A. The pair of left and right first brackets 7 are disposed at symmetrical positions with a center line passing through the center in the left-right direction of the seat back 1 as a symmetry axis. Each first bracket 7 has a front side portion 7A facing forward and left and right side portions 7B extending rearward from both left and right edges of the front side portion 7A, and has a groove shape with a cross section opened rearward. Each first bracket 7 is coupled to the first upper frame 4 at the rear edges of the left and right side portions 7B. Each first bracket 7 extends upward and downward with respect to the first upper frame 4. The upper part 7C of the front side part 7A of each first bracket 7 projects forward with respect to the lower part 7D.

  As shown in FIGS. 4 to 6, the second bracket 11 is spanned between the pair of left and right first brackets 7. The second bracket 11 has a plate shape with a main surface facing front and rear, and both left and right ends are welded to the side portion 7B of the first bracket 7. The second bracket 11 is disposed at a distance from the frame main body portion 4A and projects upward from the upper edge of the frame main body portion 4A.

  As shown in FIGS. 1-3, the 2nd upper frame 5 makes | forms plate shape provided with the main surface which faces front and back. The second upper frame 5 is formed with beads at appropriate positions in order to increase rigidity. A fastening seat 5A that protrudes upward is formed at the center of the upper edge of the second upper frame 5 in the left-right direction.

  The headrest support device 20 includes a headrest pillar 21 (rotating member) and a support member 22 that rotatably supports the headrest pillar 21. In the present embodiment, the support member 22 is coupled to the seat back frame 2, and the headrest pillar 21 is coupled to the headrest 24.

  The headrest pillar 21 includes a turning shaft portion 25 extending left and right, and a pair of left and right connecting portions 26 extending from the left and right ends of the turning shaft portion 25 substantially perpendicular to the turning shaft portion 25 and substantially parallel to each other. As a whole, it is formed in a substantially U shape. The rotating shaft portion 25 and the left and right connecting portions 26 are formed by bending a continuous metal rod or pipe member.

  The support member 22 includes a first member 31 and a second member 32 that are coupled to each other. Various materials can be selected for the first member 31 and the second member 32, but in the present embodiment, the first member 31 and the second member 32 are formed of a resin material. The first member 31 constitutes the rear part of the support member 22, and the second member 32 constitutes the front part of the support member 22. The first member 31 and the second member 32 are in contact with each other at the respective edge portions. The first member 31 and the second member 32 are coupled to each other in a pair of left and right first coupling portions 34, a second coupling portion 35, a pair of left and right third coupling portions 36, and a fourth coupling portion 37, which will be described later.

  As shown in FIGS. 5 and 6, the central portion of the second member 32 forms a bulging portion 32A that bulges forward with respect to the edge portion. By the bulging portion 32A, the first member 31 and the second member 32 cooperate with each other to form a hollow inner chamber 38 therebetween. As shown in FIG. 2, the edge of the first member 31 projects outward from the edge of the second member 32. An edge rib 41 projecting forward is extended from the edge of the first member 31. The end surface of the edge portion of the second member 32 is disposed so as to contact the inner surface of the edge rib 41.

  As shown in FIGS. 3 and 5, a bearing portion 45 is formed in the inner chamber 38, which is a boundary portion between the central portion and the upper portion between the first member 31 and the second member 32. The bearing portion 45 has a pair of left and right first bearing walls 46 protruding forward from the front surface 31 </ b> A of the first member 31 and a pair of left and right second bearing walls 47 formed on the rear surface of the second member 32. The left and right first bearing walls 46 and the second bearing walls 47 are arranged at positions that are symmetric with respect to the center line C passing through the center of the support member 22 in the left-right direction. The first bearing wall 46 and the second bearing wall 47 corresponding to each other on the left and right are in contact with each other and form a bearing hole 48 in cooperation with the abutting surface. The left and right bearing holes 48 have an axis extending in the left-right direction, and penetrate the boundary between the first bearing wall 46 and the second bearing wall 47 to the left and right. The left and right bearing holes 48 are arranged coaxially with each other. The rotation shaft portion 25 is inserted into the left and right bearing holes 48 and is supported rotatably about an axis extending in the left-right direction.

  A flexible elastic claw 46B is formed at the opening end of the groove 46A that forms the second half of the bearing hole 48 of the first bearing wall 46, respectively. The elastic claw 46B locks the rotation shaft portion 25 disposed in the groove 46A. Thereby, even in the state where the second member 32 is separated from the first member 31, the rotation shaft portion 25 can be held in the groove 46A. The elastic claw 46B is deformed when the rotation shaft portion 25 is inserted into the groove 46A to allow the rotation shaft portion 25 to be inserted, and is restored after the insertion of the rotation shaft portion 25 into the groove 46A is completed. And slidably contact the outer peripheral surface of the rotary shaft 25. The elastic claw 46B constitutes a part of a bearing hole 48 that rotatably supports the rotation shaft portion 25. A receiving groove 47A for receiving the elastic claw 46B is formed on the abutting surface of the second bearing wall 47 with the first bearing wall 46.

  As shown in FIG. 2, a cutout portion 49 through which the rotation shaft portion 25 passes is formed on the left and right sides of the bulging portion 32 </ b> A of the second member 32. The notch 49 extends in the front-rear direction as viewed from the left-right direction, and has a front end closed, while a rear end extends to the edge of the second member 32 and opens. The front end of the notch 49 is formed in a semicircular shape when viewed from the left and right, and is arranged along a part of the outer peripheral surface of the rotating shaft 25. The notch 49 forms a hole closed in the circumferential direction in cooperation with the front surface 31 </ b> A of the first member 31.

  As shown in FIGS. 3 and 6, a pillar-side locking member 50 (rotating member-side locking member) is provided in a portion located between the left and right first bearing walls 46 of the rotating shaft portion 25. ing. The pillar side locking member 50 is formed by a plate member having a main surface facing left and right, and is coupled to the rotating shaft portion 25 by welding or the like. The pillar side locking member 50 is disposed on the center line C. A first locking groove 50 </ b> A and a second locking groove 50 </ b> B are formed on the outer peripheral portion of the pillar side locking member 50. The first locking groove 50 </ b> A and the second locking groove 50 </ b> B penetrate the pillar-side locking member 50 in the left-right direction, and are opened outward in the radial direction around the rotation shaft portion 25. .

  A protrusion 51 is provided on the outer peripheral portion of the pillar-side locking member 50. That is, the protrusion 51 protrudes radially outward with respect to the rotation shaft portion 25. The protrusion 51 includes a core material 51A and a surface material 51B provided on the surface of the core material 51A. The core material 51A is formed of the same material as a part of the pillar side locking member 50, and is formed of metal. The core material 51 </ b> A protrudes outward from the outer peripheral edge of the pillar-side locking member 50. The protruding end edge of the core material 51 </ b> A extends in the circumferential direction around the rotation shaft portion 25. The second locking groove 50B is defined by the side portion of the core member 51A and the outer peripheral edge of the pillar-side locking member 50.

  The surface material 51B has a surface material that is more flexible than the core material 51A, and is formed of, for example, a rubber material or an elastomer. The surface material 51B is coupled to the surface of the core material 51A by adhesion or locking. The surface of the surface material extends in the circumferential direction around the rotation shaft portion 25.

  The pillar-side locking member 50 is coupled to a shaft 52 that protrudes to the left and right in parallel with the rotation shaft portion 25. A buffer material 53 is attached to one end of the shaft 52. The buffer material 53 is formed of a flexible material such as rubber, is formed in a cylindrical shape, and covers one end of the shaft 52. On the front surface 31 </ b> A of the first member 31, a first abutting portion 54 protrudes forward from a portion facing one end of the shaft 52. One end of the shaft 52 abuts against the first abutting portion 54 via the cushioning material 53, so that the headrest pillar 21 is rotated backward (when viewed from the left, the rotating shaft 25 is the center of the clockwise rotation). The limit position of rotation) is determined. The cushioning material 53 absorbs an impact when the shaft 52 hits the first abutting portion 54, suppresses the generation of abnormal noise and improves the operational feeling. When one end of the shaft 52 hits the first abutting portion 54 via the cushioning material 53, the headrest pillar 21 is in an upright position (use position), and the connecting portion 26 extends upward from the rotating shaft portion 25.

  The limit position of the forward rotation of the headrest pillar 21 (counterclockwise when the headrest pillar 21 is viewed from the left when viewed from the left) is the pillar-side locking member 50 of the first member 31. It is determined by coming into contact with a second abutting portion (not shown) provided on the front surface 31A. When the pillar side locking member 50 contacts the second abutting portion, the headrest pillar 21 is in the retracted position (non-use position), and the connecting portion 26 extends forward from the rotating shaft portion 25. Thus, the headrest pillar 21 can be rotated between the standing position and the retracted position.

  Between the headrest pillar 21 and the first member 31, a first biasing member 56 that biases the headrest pillar 21 to the retracted position with respect to the first member 31 is provided. In the present embodiment, the first biasing member 56 is a torsion coil spring, and is a coil portion supported by the rotating shaft portion 25, one end locked to the other end of the shaft 52, and the first member 31. And the other end locked to the front surface 31A. The first biasing member 56 and the pillar-side locking member 50 including the protrusion 51 are arranged offset from each other in the left-right direction.

  A support member side locking member 60 is rotatably provided at a central portion of the front surface 31A of the first member 31 and below the bearing portion 45. The support member side locking member 60 restricts the rotation of the rotation shaft portion 25 by selectively locking the rotation shaft portion 25. The support member side locking member 60 is formed by a plate member whose main surface faces front and rear, and is rotatable to the outer peripheral portion of the bolt 81 that penetrates the first member 31 and the second member 32 in the thickness direction (front and rear direction). It is supported. As will be described later, the bolt 81 passes through a bolt insertion hole (not shown) formed in the first member 31 and the second member 32 in the fourth coupling portion 37 from the rear to the front, and the nut 82 is screwed. Thus, the first member 31 and the second member 32 are fastened. The bolt 81 is disposed on the center line C of the support member 22.

  A locking piece 60 </ b> A extending outward in the radial direction around the bolt 81 is provided on the outer peripheral portion of the support member side locking member 60. The support member side locking member 60 has a locking position in which the locking piece 60A is disposed in the first locking groove 50A or the second locking groove 50B around the bolt 81, and the locking piece 60A is the first engagement. It can be rotated between the release position released from the stop groove 50A or the second locking groove 50B. The first member 31 is provided with an abutting portion (not shown) that abuts when the support member side locking member 60 is in the locking position and the release position. When the support member side locking member 60 hits the abutting portion, the rotation range of the support member side locking member 60 with respect to the first member 31 is determined.

  Between the support member side latching member 60 and the first member 31, a second biasing member 64 that biases the support member side latching member 60 to the latching position with respect to the first member 31 is provided. Yes. In the present embodiment, the second urging member 64 is a tension coil spring, and has one end locked to the support member side locking member 60 and the other end locked to the front surface 31 </ b> A of the first member 31.

  A first operating member 65 and a second operating member 66 are coupled to the support member side locking member 60. The first operation member 65 is a belt-like member formed from a woven fabric or the like. The second operating member 66 is a control cable having a guide sleeve 66A and a cable 66B received in the guide sleeve 66A so as to be displaceable. One ends of the cables 66 </ b> B of the first operation member 65 and the second operation member 66 are coupled to the outer peripheral portion of the support member side locking member 60 so as to be rotatable. For example, a support shaft protrudes from the outer periphery of the support member-side locking member 60, and one end of the cable 66B of the first operation member 65 and the second operation member 66 is rotatably supported by the support shaft. A stopper member such as a push nut may be coupled to the tip portion.

  As shown in FIG. 2, the second member 32 has an opening (not shown) through which the first member 31 passes and an opening 32C through which the cable 66B of the second member 32 passes. . One end of the opening 32 </ b> C is disposed at a portion facing the coupling portion between the first operation member 65 and the cable 66 </ b> B and the support member side locking member 60, and is wider than the other portions. As a result, when the first operating member 65 and the cable 66B are coupled to the support member side locking member 60, the tool or the like can reach the support member side locking member 60 using the opening 32C. On the front surface of the second member 32, a locking groove 32E for locking a locking tool 66C provided at the end of the guide sleeve 66A is formed.

  As shown in FIG. 2, the other end of the first operation member 65 passes through the annular guide member 67 coupled to the side frame 3, then passes through the pad and the skin of the seat back 1, and Has been pulled out. The occupant can displace the support member side locking member 60 from the locking position to the release position by pulling the first operating member 65 against the biasing force of the second biasing member 64. The other end of the cable 66B of the second operating member 66 is connected to the output end of the link mechanism 69. The link mechanism 69 is connected to, for example, a reclining mechanism that rotatably supports the seat back 1 with respect to the seat cushion, and is configured to operate the second operating member 66 according to the operating state of the reclining mechanism. It is good to be. For example, when the reclining mechanism is unlocked, the link mechanism 69 pulls the second operation member 66 against the urging force of the second urging member 64 to lock the support member side locking member 60. It may be configured to be displaced from the position to the release position. The link mechanism 69 is supported by the second upper frame 5.

  As shown in FIG. 6, the rotation shaft portion 25, the first urging member 56, the pillar side locking member 50, and the protrusion 51 are disposed in the inner chamber 38. Of the inner chamber wall surface 70 that defines the inner chamber 38 of the second member 32, a portion facing the outer peripheral portion of the pillar-side locking member 50 is formed in an arc shape. The inner chamber wall surface 70 is formed with a sliding contact portion 71 that is in sliding contact with the tip of the protrusion 51. The sliding contact portion 71 protrudes from the inner chamber wall surface 70 toward the rotation shaft portion 25 and has a portion that overlaps with the rotation locus of the protrusion 51 around the rotation shaft portion 25.

  The sliding contact portion 71 extends in the circumferential direction around the rotation shaft portion 25. The slidable contact portion 71 is provided at a position that does not slidably contact the protrusion 51 when the headrest pillar 21 is in the standing position (first position) or the retracted position (second position). Further, the sliding contact portion 71 is provided at a position where the headrest pillar 21 can be slidably contacted with the protrusion 51 when the headrest pillar 21 is on the upright position side from the intermediate position in the rotation range.

  As shown in FIGS. 2 and 3, the first member 31 and the second member 32 include a pair of left and right first coupling portions 34 disposed at the upper ends of the first member 31 and the second member 32, and the first member. 31 and a second coupling portion 35 disposed at the lower end of the second member 32, a pair of left and right third coupling portions 36 disposed at both left and right end portions of the central portion of the first member 31 and the second member 32, and It has the 4th coupling part 37 arrange | positioned in the center part of the 1st member 31 and the 2nd member 32. FIG.

  In the fourth coupling portion 37, the first member 31 and the second member 32 are fastened to each other by the bolt 81 and the nut 82. In the left and right first coupling portions 34, the first member 31, the second member 32, and the second bracket 11 are fastened to each other by bolts and nuts. In the second coupling portion 35, the first member 31, the second member 32, and the fastening seat 5A are fastened to each other by bolts and nuts. In the left and right third coupling portions 36, the first member 31, the second member 32, and the first bracket 7 are fastened to each other by bolts and nuts.

  As shown in FIG. 1, the distal ends of the left and right connecting portions 26 are inserted into the headrest 24 and are coupled to the headrest 24. The headrest 24 may include, for example, a support, a pad and an outer skin that are placed on the support, and a cylindrical pillar holding portion that is provided on the support and receives the left and right connecting portions 26. The pillar holding part may have a lock member that engages with the connecting part 26 and adjusts the insertion length of the connecting part 26 with respect to the pillar holding part.

  The effects of the headrest support device 20 configured as described above will be described below. When the headrest pillar 21 rotates, the protrusion 51 and the sliding contact portion 71 are in sliding contact with each other, so that the rotation of the rotating member can be moderated by the frictional resistance. Since the rotation of the rotating member can be attenuated by the simple configuration of the protrusion 51 and the sliding contact portion 71, it is possible to avoid an increase in the size of the headrest support device.

  Since the pillar side locking member 50 including the rotation shaft portion 25, the first urging member 56, and the protrusion 51 is disposed in the inner chamber 38, and the sliding contact portion 71 is formed on the inner chamber wall surface 70, An increase in the size of the headrest support device 20 can be avoided. Further, since the protrusion 51 and the sliding contact portion 71 are disposed in the inner chamber 38, it is possible to prevent the foreign matter from being caught between the protrusion 51 and the sliding contact portion 71.

  Since the slidable contact portion 71 extends in the circumferential direction around the rotation shaft portion 25, the slidable contact range between the protrusion 51 and the slidable contact portion 71 is lengthened, and the headrest pillar 21 is gently rotated. The range to do can be lengthened. By adjusting the length and position of the sliding contact portion 71, it is possible to give a rotational resistance to the headrest pillar 21 in an arbitrary rotational range.

  Since the slidable contact portion 71 is provided at a position where the headrest pillar 21 is not slidable when the headrest pillar 21 is in the standing position and the retracted position, the protruding portion 51 and the slidable portion 71 are slid only when the headrest pillar 21 rotates. The contact portion 71 comes into sliding contact, and frictional resistance is generated. Further, since the sliding contact portion 71 is provided at a position where the headrest pillar 21 is slidably contacted with the protrusion 51 when the headrest pillar 21 is in the upright position side with respect to the rotation range, the first biasing member 56 A frictional force can be applied from the beginning of rotation with a large urging force, and an increase in the rotation speed of the headrest pillar 21 can be suppressed.

  Since the protrusion 51 that generates the frictional resistance is provided on the pillar-side locking member 50, the space for providing the protrusion 51 can be reduced. Further, the protrusion 51 can be disposed at a position away from the rotation shaft portion 25, and the total range of frictional resistance can be increased by increasing the range of movement of the protrusion 51 by rotation.

  Since the protrusion 51 is formed by the core material 51 </ b> A and the surface material 51 </ b> B, the protrusion 51 can reliably contact the sliding contact portion 71. Further, the protrusion 51 can smoothly slide on the surface of the sliding contact portion 71 by the deformation of the surface material 51B.

(Second Embodiment)
The headrest support device 100 according to the second embodiment is different from the headrest support device 20 according to the first embodiment in that the position of the sliding contact portion 71 and the thin portion 101 are provided, and the other configurations are the first embodiment. This is the same as the headrest support device 20 according to the embodiment. As shown in FIG. 7, the slidable contact portion 71 is provided at a position where the headrest pillar 21 can be slidably contacted with the protrusion 51 when the headrest pillar 21 is located at the retracted position side from the intermediate position in the rotation range.

  The inner chamber wall surface 70 has a thin portion 101 that is thinner than the other portions around the sliding contact portion 71. When the sliding contact portion 71 is in sliding contact with the protrusion 51, the thin portion 101 can be displaced outward in the radial direction around the rotation shaft portion 25. Thereby, the headrest pillar 21 can be smoothly rotated. In other embodiments, instead of the thin portion 101, an easily deformable portion including a through hole, a groove portion, and the like may be provided.

  In the headrest support device 100 according to the second embodiment, the slidable contact portion 71 is provided at a position where the slidable contact portion 71 can be slidably contacted with the protrusion 51 when the headrest pillar 21 is on the retracted position side from the intermediate position in the rotation range. Therefore, the rotation speed can be reduced in the second half of the rotation range of the headrest pillar 21, and a high-class feeling can be imparted to the headrest 24.

(Third embodiment)
The headrest support device 110 according to the third embodiment is different from the headrest support device 20 according to the first embodiment in the configuration of the protrusion 51 and the sliding contact portion 71, and the other configurations are the headrest support according to the first embodiment. It is the same as the device 20.

  As shown in FIG. 8, the protrusion 51 is formed only from the core material 51A, and the surface material 51B is omitted. Two slidable contact portions 71 are provided independently of each other. The slidable contact portions 71 are arranged away from each other in the circumferential direction around the rotation shaft portion 25. That is, the slidable contact portion 71 extends intermittently in the circumferential direction around the rotation shaft portion 25. Each sliding contact portion 71 has a core material 71A and a surface material 71B provided on the surface of the core material 71A. The core material 71A is formed of the same material as a part of the second member 32, and is formed of resin. The surface material 71B has a surface material that is more flexible than the core material 71A, and is formed of, for example, a rubber material or an elastomer. The surface material 51B is coupled to the surface of the core material 51A by adhesion or locking. The surface of the surface material extends in the circumferential direction around the rotation shaft portion 25.

  In the headrest support device 110 according to the third embodiment, each sliding contact portion 71 can be made small, and each sliding contact portion 71 can be easily deformed when contacting the projection 51. Thereby, the headrest pillar 21 can be smoothly rotated. Moreover, the range which decelerates the headrest pillar 21 can be enlarged.

  Further, since the sliding contact portion 71 is formed by the core material 71 </ b> A and the surface material 71 </ b> B, the sliding contact portion 71 can reliably contact the protrusion 51. Further, the protrusion 51 can smoothly slide on the surface of the sliding contact portion 71 by deforming the surface material 71B.

  In the third embodiment, the two sliding contact portions 71 may have different protrusion amounts toward the rotation shaft portion 25. That is, the distance between the two sliding contact portions 71 and the rotation shaft portion 25 may be different from each other. In this case, the frictional force generated between each sliding contact portion 71 and the protrusion 51 changes. Thereby, the rotational speed can be changed according to the rotational position of the headrest pillar 21.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above embodiment and can be widely modified. For example, the distance between the sliding contact portion 71 and the rotation shaft portion 25 may change in the circumferential direction around the rotation shaft portion 25. When the protrusion amount of the slidable contact portion 71 increases in the circumferential direction around the rotation shaft portion 25, the friction between the protrusion 51 and the slidable contact portion 71 as the headrest pillar 21 rotates toward the retracted position. The force increases and the rotation speed decreases. On the other hand, when the protrusion amount of the sliding contact portion 71 decreases as it goes downward, the frictional force between the protruding portion 51 and the sliding contact portion 71 decreases and the rotation speed increases as the headrest pillar 21 rotates toward the retracted position. . Thus, the rotation speed of the headrest pillar 21 can be adjusted by inclining the protruding end of the sliding contact portion 71 with respect to the circumferential direction.

1: Seat back 2: Seat back frames 20, 100, 110: Headrest support device 21: Headrest pillar (rotating member)
22: Support member 24: Headrest 25: Rotating shaft portion 26: Connection portion 50: Pillar side locking member 50A: First locking groove 50B: Second locking groove 51A: Core material 51B: Surface material 51: Projection 60: Support member side locking member 70: Inner chamber wall surface 71: Sliding contact portion 71A: Core material 71B: Surface material 101: Thin wall portion

Claims (11)

A headrest support device for supporting a headrest on a seat back frame,
A support member provided on the seat back frame;
A rotation shaft portion extending left and right and rotatably supported by the support member, and a rotation member provided with a connection portion extending substantially vertically from the rotation shaft portion and coupled to the headrest;
An urging member for urging the rotating shaft portion in one rotational direction with respect to the support member;
A support member-side locking member that is provided on the support member and restricts the rotation of the rotation shaft portion by selectively locking the rotation shaft portion;
A protrusion protruding radially from the pivot shaft;
A headrest support device comprising a flexible sliding contact portion provided on the support member and in sliding contact with a tip of the protrusion. The support member has a hollow inner chamber,
The pivot shaft portion, the biasing member, and the protrusion are disposed in the inner chamber,
The headrest support device according to claim 1, wherein the sliding contact portion is formed on an inner chamber wall surface that defines the inner chamber.   The headrest support device according to claim 2, wherein the sliding contact portion protrudes from the inner chamber wall surface toward the rotation shaft portion.   4. The headrest support device according to claim 2, wherein the sliding contact portion extends in a circumferential direction around the rotation shaft portion. 5. A plurality of the sliding contact portions are provided,
The headrest support according to any one of claims 2 to 4, wherein each of the sliding contact portions is disposed away from each other in a circumferential direction centering on the rotation shaft portion. apparatus.   The headrest support device according to any one of claims 2 to 5, wherein the sliding contact portion has a portion that overlaps a rotation locus of the protrusion.   The protrusion has a core material and a surface material that is provided on a surface of the core material and is more flexible than the core material, and is in sliding contact with the sliding contact portion in the surface material. The headrest support device according to any one of claims 2 to 6.   The headrest support device according to any one of claims 2 to 7, wherein the inner chamber wall surface has a through hole or a thin wall portion around the sliding contact portion. The rotation shaft portion has a plate-like rotation member side locking member protruding radially outward,
A locking groove into which the support member side locking member is selectively fitted is recessed in the outer peripheral portion of the rotating member side locking member, and the protrusion is protruded. The headrest support device according to any one of claims 2 to 8. The rotating member rotates between a first position where the headrest is positioned at a use position and a second position where the headrest is positioned at a non-use position.
The biasing member biases the rotating member toward the second position,
The said sliding contact part is provided in the position which is not slidably contacted with the said protrusion, when the said rotation member exists in the said 1st position and the said 2nd position. The headrest support device according to any one of the above.   11. The sliding contact portion is provided at a position where the sliding member can be slidably contacted with the protruding portion when the rotating member is closer to the first position than an intermediate position in a rotation range. The headrest support device described in 1.

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