JP2006015022A - Attaching structure of reclinable headrest for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an attaching structure of a reclinable headrest for a vehicle, by which the headrest body 7A can be further surely turned with a small turning force. <P>SOLUTION: A gap is formed between the headrest body 7A and a recess portion 8A, cap bodies 80A and 80B overhanging from the side faces 10A and 10B of the headrest body 7A is brought into contact with the side faces 13A and 13B of the recess portion 8A, thereby an area where the headrest body 7A is brought into contact with the recess portion 8A is reduced as much as possible, to reduce the friction force generated between the headrest body 7A and the recess portion 8A, when turning the headrest body 7A, consequently the transmitted turning force can be prevented from reducing, and the headrest body 7A can be further surely turned with a small turning force. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a tiltable headrest for a vehicle, and is suitable for application to a mounting structure for a tiltable headrest for a vehicle in which a headrest main body provided rotatably on a pillar is mounted on an upper portion of a seat back. It is.

  Conventionally, in a vehicle, the headrest body (headrest) provided on the upper part of the seat back is moved forward in conjunction with the shift change of the back gear, so that the headrest body does not protrude from the upper part of the seat back and the rear view is secured. Such a headrest control device has been considered (see, for example, Patent Document 1).

By the way, in the headrest control device having such a configuration, a motor is provided in the seat back, and the motor is driven so that the headrest body can move between the standing position and the forward position.
Japanese Patent Laid-Open No. 2-60847

  However, in the headrest control device as a vehicle retractable headrest having such a configuration, when the headrest body is moved between the standing position and the forward position, almost the entire bottom surface of the headrest body is brought into contact with the upper portion of the seat back. Since the headrest main body is moved in a state where the headrest has been moved, a large frictional force is generated between the headrest main body and the seat back upper portion. For this reason, if the motor does not give the headrest body a large rotational force that overcomes the frictional force generated between the headrest body and the upper part of the seat back, the motor will either tilt the headrest body in an upright state or headrest body in a forward-turned state There was a problem that could not be caused.

  The present invention has been made in consideration of the above points, and it is an object of the present invention to provide a mounting structure for a tiltable headrest for a vehicle that can further reliably rotate the headrest body with a small rotational force.

  According to a first aspect of the present invention, there is provided a mounting structure for a vehicle headrest, in which a headrest body is rotatably provided by a pillar in a recess formed in an upper portion of a seat back, the headrest body and the recess. And a protruding portion provided on the outer periphery of the pillar so as to protrude from the side surface of the headrest body so as to contact the recess.

  Further, according to claim 2 of the present invention, the projecting portion is selected such that the diameter of the abutting surface that contacts the recess is smaller than the diameter of the other end portion provided on the side surface of the headrest body, A curved shape is formed from the other end to the contact surface, and the peripheral edge is rounded.

  According to the first aspect of the present invention, the frictional force generated between the headrest body and the recess when the headrest body is rotated is reduced by reducing the region where the headrest body is in contact with the recess as much as possible. Thus, it is possible to prevent the turning force from being reduced, and thus the headrest body can be rotated more reliably with a small turning force.

  According to the second aspect of the present invention, since there is no corner portion that causes frictional force in the region where the overhanging portion contacts the side surface of the concave portion, the headrest body is smooth against the side surface of the concave portion. Thus, it is possible to prevent the rotational force transmitted from being reduced.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  In FIG. 1, reference numeral 1 denotes a vehicle rear seat as a whole. The rear seat 1 includes a seat cushion 2, a seat back 3, and vehicle retractable headrests 4A, 4B and 4C disposed on the seat back upper portion 3A. Each having a structure in which a cushion pad is assembled to a frame (not shown), and a skin L is attached thereto.

  Actually, the seat back 3 has a trunk through portion 5 that is partially opened at the center, and the trunk through portion 5 is provided with a trunk through opening / closing device 6 for the vehicle. The vehicle-use retractable headrests 4A, 4B, and 4C are respectively arranged on the upper part of the vehicle and on the left and right sides of the upper part.

  These retractable headrests 4A, 4B and 4C for vehicles have the headrest bodies 7A, 7B and 7C exposed to the upper part 3A of the seat back 3, respectively, and the lower side of the headrest bodies 7A, 7B and 7C rotates as shown in FIG. The headrest body 7A, 7B and 7C are housed in the recesses 8A, 8B and 8C formed in the seat back upper part 3A, respectively, and the upper part of the seat back upper part 3A and the headrest are moved. The front faces 9A, 9B, and 9C of the main bodies 7A, 7B, and 7C can be formed in a substantially flat shape.

  Since these vehicle-use retractable headrests 4A, 4B, and 4C all have the same internal structure, only the vehicle retractable headrest 4A will be described below for convenience of explanation.

  Actually, as shown in FIG. 3, the headrest 4A for a vehicle has a headrest body 7A disposed in a recess 8A formed in the seat back upper part 3A, and projects from the side surfaces 10A and 10B of the headrest body 7A. The pillar 11 is attached to a seat back frame 12 included in the seat back 3, whereby the headrest body 7 A is supported by the recess 8 A of the seat back 3.

  Here, the headrest body 7A has a long side shape that is horizontally long and thick, and as shown in FIG. 4, the side surfaces 10A and 10B are formed so as to be substantially parallel to the side surfaces 13A and 13B of the recess 8A. In addition, the width dimension W1 between the side surfaces 10A and 10B is selected to be slightly shorter than the width dimension W2 between the side surface surfaces 13A and 13B of the recess 8A, and the pillar cover 14A protruding from the side surfaces 10A and 10B and Only the cap bodies 80A and 80B of the 14B can contact the side surfaces 13A and 13B of the recess 8A, respectively.

  Thus, the headrest body 7A can form a slight gap G1 between the side surface 10A and the side surface 13A of the concave portion 8A facing it, and the side surface 10B on the opposite side and the side surface 13B facing it. A slight gap G1 can be formed between them.

  In practice, the cap body 80B is integrally molded, and as shown in FIG. 5, the cap body 80B has a substantially dish-like appearance as a whole, and the diameter of the contact surface 94A that contacts the side surface 13B of the recess 8A is The diameter is selected to be smaller than the diameter on the other end 94B side provided on the side surface 13B side surface of the headrest body 7A. Have

  Incidentally, the cap body 80B is stretched from the side surface of the headrest body 7A by being fitted to the tips of the first and second cover halves 82A and 82B (described later with reference to FIG. 13) constituting the pillar cover 14B. It is configured to issue.

  In addition to this configuration, as shown in FIG. 4, the headrest body 7A is formed such that, when standing, the bottom surface 10C is substantially parallel to the concave surface 13B of the concave portion 8A, and the side surfaces 10A and 10B The height dimension H1 from the pillar protruding position where the pillar 11 protrudes to the bottom surface 10C is from the pillar insertion position where the pillar 11 is inserted into the side surfaces 13A and 13B of the recess 8A to the recess surface 13B of the recess 8A. The height is selected to be slightly shorter than the height dimension H2, and a slight gap G2 can be formed between the bottom surface 10C of the headrest body 7A and the concave surface 13B of the concave portion 8A.

  The pillars 11 protruding from the side surfaces 10A and 10B of the headrest body 7A are disposed between the side surfaces 13A and 13B of the recess 8A so as to be substantially horizontal.

  Thus, the headrest body 7A can avoid contacting the side surfaces 10A and 10B with the side surfaces 13A and 13B of the recess 8A when the headrest body 7A changes from the standing state to the rearward state or from the rearward state to the standing state. The bottom surface 10C can be prevented from coming into contact with the concave surface 13B of the concave portion 8A.

  In practice, the headrest body 7A has a headrest case 15 in a cushion / pad as shown in FIG. 6, and pillar covers are provided on side surfaces 16A and 16B of the headrest case 15. Pillar cover covers 81A and 81B are arranged in the cushion cover.

  The pillar 11 protruding from the ends of the pillar covers 14A and 14B is supported by being fitted into cylindrical pillar receiving portions 17A and 17B provided at the corners of the recess 8A of the seat back 3.

  Here, the pillar 11 is made of a metal material, and as shown in FIG. 7, the lower side of the headrest case 15 is rotatably provided on the horizontal shaft portion 20, and end portions 21 </ b> A that are continuous on both sides of the horizontal shaft portion 20. And 21B project from the pillar covers 14A and 14B, bend substantially vertically downward, and then extend rearward.

  The headrest case 15 has a configuration in which a first case 22 made of a metal material is rotatably provided on the pillar 11 and a second case 23 made of a synthetic resin material is fitted into the first case 22.

  Incidentally, in the headrest case 15, as shown in FIG. 8, a reverse torsion coil spring 25 for urging the upper portion of the headrest body 7A rearward, a lock plate 26, and the lock plate 26 A retractable mechanism 30 comprising a latch 27 to be latched, a torsion coil spring 28 for urging the latch 27, and an actuator portion 29 for unlocking the latch 27 from the lock plate 26 is incorporated, For example, the raised headrest case 15 can be moved backward by the tiltable mechanism 30 in response to depression of an operation switch (not shown) as an operation unit provided on the front panel.

  Actually, a lock plate 26 for fixing the headrest case 15 in an upright state is fixed to the horizontal shaft portion 20 of the pillar 11 located in the headrest case 15 at a substantially central portion.

  As shown in FIG. 9, the lock plate 26 is formed with a notch 32 at the top for engaging with a latch 27 that is rotatably provided on the latch bracket 31, and more than the pillar 11. A cylindrical stopper 33 is provided so as to penetrate the thickness above and at a position ahead of the notch 32.

  Incidentally, the stopper 33 is capable of restricting the forward rotation of the headrest body 7A by the contact of the latch bracket 31 when the headrest body 7A is standing.

  Further, the horizontal shaft portion 20 of the pillar 11 supports a pillar bearing portion 34 provided on the inner side of the first case 22 on both sides of the lock plate 26 so as to be rotatable.

  Actually, as shown in FIGS. 10A and 10B, the pillar bearing portion 34 is formed so that the flat surface portion 35 can be fixed to the inner side surface of the first case 22. Side portions 36A and 36B are bent at substantially right angles, and through holes 37 are formed in the side portions 36A and 36B, respectively, and the horizontal shaft portion 20 of the pillar 11 is inserted into the through holes 37. .

  Further, the pillar bearing portion 34 has a spring locking portion 38 formed on the upper side of one side portion 36A, and one end of a reverse torsion coil spring 25 provided on the horizontal shaft portion 20 by the spring locking portion 38. 25A can be locked.

  Here, the reverse torsion coil spring 25 (FIG. 8) is inserted from one side portion of the horizontal shaft portion 20, and the other end 25B is fixed to the lock pin 39 protruding from one side portion of the horizontal shaft portion 20. Locked and configured to apply a load in the direction of rewinding the backward torsion coil spring 25.

  Thus, the backward torsion coil spring 25 always applies a load to the first case 22 that causes the upper portion of the headrest body 7A to fall backward via the pillar bearing portion.

  Incidentally, a latch bracket 31 as shown in FIGS. 11A and 11B is fixed to the flat surface portion 35 of the pillar bearing portion 34, and an opening formed in the vicinity of the central portion of the latch bracket 31. A lock plate 26 is disposed at 41.

  In practice, the latch bracket 31 is formed with side plates 42A and 42B erected substantially at right angles by bending a plate-like plate in a U-shape near the center, and an opening 41 between the side surfaces 42A and 42B. Have

  The latch bracket 31 has through holes 43A and 43B on the side surfaces 42A and 42B, respectively. As shown in FIG. 12, the latch 27 is disposed in the opening 41 between the side surfaces 42A and 42B. A shaft member 45 is provided in the through holes 43A and 43B of the side surfaces 42A and 42B, and the latch 27 is pivotally attached to the opening 41 by the shaft member 45 so as to be rotatable.

  In addition, the latch bracket 31 is provided with a torsion coil spring 28 for latching between the outer surface of the side surface 42A and the shaft member 45, and one end 28A of the torsion coil spring 28 for latch is connected to one side surface 42A. And the other end 28B of the torsion coil spring 28 for latching is locked to a plate-like push-up part 50 formed on the upper part of the latch 27.

  The torsion coil spring 28 for latch is configured to apply a load in a direction to rewind the torsion coil spring 28 for latch, and the locking projection 51 formed on the lower portion of the latch 27 is always locked to the lock plate by the load. It can be made to contact 26.

  Thus, when the headrest body 7A is in the standing state, the latching projection 51 of the latch 27 is fitted into the notch 32 of the lock plate 26 in the latch bracket 31 as shown in FIG. Even when a load is applied to the torsion coil spring 25, the cutout portion 32 can be maintained in a state of pressing the locking projection 51, and the headrest body 7A can be held in a substantially upright state.

  In the case of this embodiment, a lock plate stopper portion 52 made of a rubber member is provided on the inner lower surface of the first case 22, and when the headrest body 7A is in an upright state, the upper surface of the lock plate stopper portion 52 is The lower portion of the lock plate 26 abuts, so that the headrest body 7A can be reliably maintained in an upright state.

  By the way, as shown in FIG. 8, an actuator portion 29 is disposed above the latch bracket 31 in the first case 22, and the tip of the rack 53 protrudes from the side portion of the actuator portion 29.

  The rack 53 is arranged in a horizontal direction substantially parallel to the horizontal shaft portion 20 of the pillar 11, and a circular locking hole 54 is formed at the tip so as to penetrate the thickness. A headed shaft 56 formed at one end 55A is inserted into the locking hole 54 so that the rack 53 and the latch push-up arm 55 can be interlocked. Incidentally, a widened head 57 is formed on the headed shaft 56, and even if the rack 53 and the latch push-up arm 55 are interlocked with each other by the widened head 57, the headed shaft 56 is dropped from the locking hole 54. This can be prevented.

  In practice, the latch push-up arm 55 is substantially L-shaped, and a corner is rotatably provided inside the first case 22 via a fixed shaft 58, and the other end 55B (FIG. 9) is a latch bracket. It is arranged so that it can be positioned on the lower surface 59 (hereinafter referred to as a pressing surface) 59 of a plate-shaped pressing portion 50 that extends in the horizontal direction from the upper portion of the opening 41 of 31 and protrudes.

  Incidentally, the other end of the arm torsion coil spring 65 whose one end is locked to the pillar bearing portion 34 is locked to the rack push-up arm 55, and one end 55A of the rack push-up arm 55 is always on the actuator portion 29 side. It is designed to be energized.

  Here, as shown in FIG. 8, the actuator unit 29 meshes with a motor 60 having a rotation shaft arranged in the horizontal direction and a worm 61 provided on the rotation shaft of the motor 60, and A gear 62 that meshes with the other end is built in the case body 63, and a rack push-up arm 55 that interlocks with the rack 53 is disposed outside the case body 63.

  Here, one end of the wiring 64 is electrically connected to the motor 60 in the case body 63.

  The wiring 64 is routed from the motor 60 in the case body 63 along the upper inner surface and the left inner surface to bypass the latch push-up arm 55 and pass through the pillar cover 14B on the lower left inner surface. Then, the headrest body 7A is routed around the seat back 3.

  Incidentally, the wiring 64 is fixed by clicking at a predetermined position of the back seat frame 12 and is routed from the upper part to the lower part of the seat back frame 12, and the other end is electrically connected to a power supply unit (not shown) on the vehicle side. It is connected.

  Here, in the pillar cover 14B that covers the wiring 64 and the pillar 11, as shown in FIG. 14, the cover body 81B is composed of first and second cover halves 82A and 82B. Cap bodies 80B are provided at the tips of the two cover halves 82A and 82B.

  In practice, the first cover half body 82A has a plurality of fitting holes 83 formed in the side surface at predetermined intervals, a groove portion 84 is formed on the outer peripheral surface of the stepped portion at the tip, and A case locking portion 85 having a U-shaped cross section for locking with the first and second case bodies 22 and 23 is formed.

  In the first cover half 82A, wiring holding portions 86 are provided on the inner surface at predetermined intervals, and a wiring lead-out portion 87 having the same width as the facing interval of the wiring holding portions 86 is formed on the outer peripheral surface of the stepped portion at the tip. Thus, the wiring 64 is latched and held in the wiring holding portion 86, so that the wiring 64 can be simultaneously fitted into the wiring leading portion 87 at the tip.

  On the other hand, the second cover half body 82B is provided with a plurality of fitting portions 88 standing on the side surface at predetermined intervals so as to correspond to the respective fitting holes 83 of the first cover half body 82A. A groove portion 89 is formed on the outer peripheral surface of the step portion, and a case locking portion 90 having a U-shaped cross section for locking with the first and second case bodies 22 and 23 is formed at the root.

  Here, the cap body 80B has a thin shape, and a through hole 91 is formed in the bottom plate of the contact surface 94A. The first and second cover halves 82A and 82B are formed at the peripheral edge of the through hole 91. A protrusion 92 that can be fitted into the grooves 84 and 89 is formed.

  Thus, the first and second cover halves 82A and 82B have the first and second covers in a state where the wiring 64 is locked and held by the wiring holding portion 84 and the wiring lead-out portion 87 of the first cover half 82A. The pillar 11 is positioned between the half bodies 82A and 82B, and as shown in FIG. 15, the fitting portions 88 of the second cover half body 82B respectively corresponding to the fitting holes 83 of the first cover half body 82A. The pillar 11 and the wiring 64 can be arranged between the first and second cover halves 82A and 82B.

  Then, as shown in FIG. 14, the pillar 11 and the wiring 64 are inserted through the through hole 91 of the cap body 80B, and the cap body is inserted into the grooves 84 and 89 of the first and second cover halves 82A and 82B in this state. The protrusion 92 of the 80B is fitted, and the joint of the first and second cover halves 82A and 82B can be fixed by the cap body 80B.

  When the projection 92 of the cap body 80B is fitted into the grooves 84 and 89 of the first and second cover halves 82A and 82B in this way, as shown in FIG. 16, the first cover half 82A (shown) The same applies to the second cover half body 82B not to be formed) and the contact surface 94A of the cap body 80B can be formed substantially in a flat shape. The first and second cover halves 82A and 82B are attached to the notch-shaped side portion attaching portions 95 of the first and second case bodies 22 and 23 by the case locking portions 85 and 90, respectively.

  Incidentally, in the case of this embodiment, the surfaces contacting the side surfaces 13A and 13B of the recess 8A are the front end surface 93 of the first and second cover halves 82A and 82B and the contact surface 94A of the cap body 80B. However, the present invention is not limited to this, and only the contact surface 94A of the cap body 80A may be brought into contact with the side surfaces 13A and 13B of the recess 8A.

  Note that the first and second cover halves 82A and 82B are configured so that the wiring 64 to which the wiring cover 96 is attached by the wiring holding portion 86 and the wiring lead-out portion 87 is substantially straight along the horizontal axis portion 20. It can be arranged in a state of being made into a shape.

  Thus, the motor 60 in the headrest body 7A can be driven to rotate by being supplied with power from the power supply unit of the vehicle via the wiring 64 passing through the pillar cover 14B.

  Thus, the actuator unit 29 transmits the rotational driving force to the rack 53 via the gear 62 by instantaneously rotating the motor 60 forward and backward in response to a command given from an operation switch (not shown). The rack 53 can be instantaneously reciprocated in the horizontal direction.

  In practice, as shown in FIG. 17, the actuator unit 29 normally has the rack 53 drawn into the case body 63, one end of the rack 53 is in the normal position P1, and the motor 60 is rotated forward. This rotational driving force is transmitted to the rack 53 via the worm 61 and the gear 62, and the rack 53 is moved in the horizontal direction so as to push it out of the case body 63, thereby latching one end of the latch push-up arm 55 from the normal position P1. It can be moved to the latch release position P3 via the position P2.

  At this time, as shown in FIG. 18, the rack push-up arm 55 moves up from the normal position P1 to the latch release position P3 so that the other end 55B is raised via the fixed shaft 58. Pushes up the pushing surface 59 of the latch 27.

  In practice, when the other end 55B of the latch push-up arm 55 is at the latch contact position P2, the other end 55B comes into contact with the push-up start position P5 of the push-up surface 59 as shown in FIG. 19A and FIG. When one end 55A moves from the latch contact position P2 to the latch release position P3, it moves to the push-up position P6 while contacting the push-up surface 59 as shown in FIGS. 19B and 20, and pushes up accordingly. Push up part 50.

  Thus, as shown in FIGS. 21A and 21B, the latch 27 rotates about the shaft member 45 as the other end 55B of the latch push-up arm 55 moves from the push-up start position P5 to the push-up position P6. In response to this, as shown in FIG. 18, the lower locking projection 51 is rotated and raised to lock the locking projection 26 which is locked to the notch 32 of the lock plate 26. 51 is removed from the notch 32 of the lock plate 26.

  Thereby, as shown in FIG. 22, the first case 22 transmits the urging force of the backward torsion coil spring 25 via the pillar bearing portion 34, and the urging force causes the horizontal shaft portion 20 to move. The rotary shaft can be moved backward.

  At this time, as shown in FIG. 23, the latch 27 always holds the locking projection 51 of the latch 27 by the urging force of the latch torsion coil spring 28 as the first case 22 is moved backward. Rotates while abutting against.

  Thus, as shown in FIG. 24, the headrest main body 7A is moved forward until the back surface 70 of the headrest main body 7A comes into contact with the rearward movement restricting portion 71 of the recess 8A of the seat back upper portion 3A. 9A and the back sheet upper part 3A are formed in a planar shape so as to substantially coincide with each other.

  At this time, the headrest body 7A is formed so that the bottom surface 10C and the front surface 3B of the seat back 3 are substantially flat, and a slight gap G3 is provided between the back surface 70 and the concave surface 13B of the concave portion 8A. It can be formed.

  In addition, the backward-turning restricting portion 71 with which the headrest body 7A abuts is a relatively thin and soft member such as an outer skin, and is provided across the width dimension W2 of the recessed portion 8A, and one end 72A is the central portion of the recessed surface 13B of the recessed portion 8A. It is attached in the vicinity, and the other end 72B is folded back in a substantially U shape by the support member 73 disposed at the rear, and is attached in the vicinity of the rear of the concave surface 13B, so that the end 72A is interposed between the support member 73 and the support member 73. It is stretched and configured to be slightly elastic.

  Thus, the rearward restriction part 71 can absorb an impact that occurs when the headrest body 7A comes back and abuts.

  In the above configuration, the first and second cover halves 82A and 82B are arranged in the cushion pad, and only the cap bodies 80A and 80B are projected from the side surfaces 10A and 10B of the headrest body 7A.

  The headrest body 7A is provided with a gap G2 between the bottom surface 10C and the concave surface 13B of the concave portion 8A, and also provided with a gap G1 between the side surfaces 10A and 10B and the concave portion 8A, and projects from the side surfaces 10A and 10B. Only the cap bodies 80A and 80B are brought into contact with the side surfaces 13A and 13B of the recess 8A.

  Thus, the area where the headrest main body 7A contacts the concave portion 8A can be reduced as much as possible, and the frictional force generated between the headrest main body 7A and the concave portion 8A when the headrest main body 7A is rotated is reduced. It is possible to prevent the rotational power transmitted from 25 from being reduced.

  Further, the cap bodies 80A and 80B are formed in a curved shape from the other end 94B toward the abutment surface 94A, and the peripheral portion 94C is rounded so that the cap body 80A and 80B is rubbed into a region contacting the side surfaces 13A and 13B of the recess 8A. Since there are no corners that generate force, the headrest body 7A can be smoothly rotated with respect to the side surfaces 13A and 13B of the recess 8A.

  Further, the side surfaces 13A and 13B of the recess 8A and the side surfaces 10A and 10B of the headrest body 7A are not in contact with each other, and the recess surface 13B of the recess 8A and the bottom surface 10C of the headrest body 7A are not in contact with each other. In addition, it is possible to prevent the skin stuck on the headrest body 7A and the recess 8A from being worn and worn by repeated tilting and standing of the headrest body 7A, thus maintaining the rotation transmission accuracy for a long time without replacing parts. be able to.

  In addition, since the cap bodies 80A and 80B are made of a resin material such as a plastic material, for example, the friction with respect to the side surfaces 13A and 13B of the recess 8A can be reduced when the headrest body 7A rotates.

  In the case of this embodiment, since the cap bodies 80A and 80B are integrally formed, there is no step due to the cut on the contact surface 94A, so that there is no step, and therefore the side surfaces 13A and 13B of the recess 8A Thus, the headrest body 7A can be rotated smoothly, and the side surfaces 13A and 13B of the recess 8A can be prevented from being damaged by the cut.

  Incidentally, in the case of this embodiment, the gaps G1 and G2 are selected to be about 5 mm, and since the gaps G1 and G2 are small, the headrest body 7A and the recess 8A can be boarded while being reliably separated from each other. This makes it difficult for a person to recognize the gaps G1 and G2, and as a whole, the seat back 3 and the headrest body 7A can be integrated in appearance.

  Further, in the case of this embodiment, the headrest main body 7A is reduced by reducing the frictional force at the time of the backward movement by stretching the backward movement restricting portion 71 so as to have a slight elasticity on the concave surface 13B. Even if the headrest body 7A is moved backward, the headrest body 7A hits the backward movement restriction section 71, and the backward movement restriction section 71 can absorb the impact when the headrest body 7A is moved backward. It can be prevented from being damaged by impact.

  Further, in the case of this embodiment, by reducing the frictional force at the time of backward movement, the headrest body 7A can be reliably moved only by the urging force of the backward torsion coil spring 25 without using the rotational driving force by the motor. Thus, the power consumption can be reduced by the amount that the motor is not kept rotating.

  Incidentally, in the case of this embodiment, when the headrest body 7A in the rearward state is brought into the standing state, the headrest body 7A is kept almost vertical to the front against the urging force of the torsion coil spring 25 for backward movement. Although it is moved manually, even at this time, the frictional force generated between the headrest body 7A and the recess 8A can be reduced, so that the headrest body 7A can be rotated smoothly.

  As described above, in the present embodiment, a gap is provided between the headrest body 7A and the recess 8A, and the cap bodies 80A and 80B protruding from the side surfaces 10A and 10B of the headrest body 7A are replaced with the side surfaces 13A and 13A of the recess 8A. It was made to contact 13B.

  Thus, by reducing the region where the headrest body 7A is in contact with the recess 8A as much as possible, the frictional force generated between the headrest body 7A and the recess 8A when the headrest body 7A is rotated is reduced, and the rotational power transmitted thereby Can be prevented, and thus the headrest body 7A can be rotated more reliably with a small rotational force.

  In the present embodiment, the contact surface 94A that contacts the side surfaces 13A and 13B of the recess 8A is formed in a curved shape so that the peripheral edge is rounded.

  Thus, since the cap bodies 80A and 80B do not have any corners that generate frictional force in the region where the cap bodies 80A and 80B are in contact with the side surfaces 13A and 13B of the recess 8A, the headrest main body 7A Can be smoothly rotated, and thus the transmitted turning force can be prevented from being reduced.

  In the above-described embodiment, the cap bodies 80A and 80B as the projecting portions have a substantially dish-like appearance as a whole, and the contact surfaces 94A that come into contact with the side surfaces 13A and 13B of the recess 8A. The diameter is selected to be smaller than the diameter on the other end 94B side provided on the side surfaces 10A and 10B of the headrest body 7A, and is formed in a curved shape from the other end 94B toward the contact surface 94A. Although the case where it is made round is described, the present invention is not limited to this, and the diameter of the contact surface that contacts the side surfaces 13A and 13B of the recess 8A is provided on the side surfaces 10A and 10B of the headrest body 7A. If the diameter is selected to be smaller than the diameter on the other end side and is formed in a curved shape from the other end side to the contact surface and rounded at the peripheral edge, it may be in various other shapes such as a hemispherical truncated cone shape. A cap body may be used.

  In the above-described embodiment, the cap bodies 80A and 80B that contact the side surfaces 10A and 10B of the headrest body 7A are provided on the outer periphery of the pillar 11, so that the cap bodies 80A and 80B protrude from the side surfaces 10A and 10B. However, the present invention is not limited to this, and cap bodies 80A and 80B that contact the side surfaces 13A and 13B of the recess 8A are provided on the outer periphery of the pillar 11, so that the cap bodies can be removed from the side surfaces 10A and 10B. You may make it 80A and 80B overhang.

  Furthermore, in the above-described embodiment, the case where the other end 55B of the latch push-up arm 55 is pushed up by the rotational drive of the motor 60 and the latch 27 is released is described, but the present invention is not limited to this. In place of the actuator unit 29 including the motor 60, the other end 55B of the latch push-up arm 55 is pushed up by manually pressing the button, the latch 26 is unlocked, and the headrest body 7A is moved backward, etc. In addition, a vehicle-use tiltable headrest using various other tiltable mechanisms may be used.

It is a rough-line perspective view which shows the whole structure of a rear seat. It is a rough-line perspective view which shows a mode when a headrest main body falls back. It is a rough-line perspective view which shows a mode that the headrest main body is supported by the seat back frame. It is detail drawing which shows the mode of arrangement | positioning of the headrest main body with respect to a recessed part. It is a basic diagram which shows the external appearance structure of a cap body. It is an approximate line sectional view showing signs that a headrest case is supported by a seat back frame. It is a rough-line perspective view which shows the whole structure of a pillar. It is a basic diagram which shows the internal structure of a headrest main body. It is detail drawing which shows the latching state of a lock plate and a latch. It is an approximate line figure showing the front composition and side composition of a pillar bearing part. It is a basic diagram which shows the front structure and side structure of a rat bracket. It is a perspective view with which it uses for description of the relationship between a latch bracket, a latch, and the torsion coil spring for a latch. It is a basic diagram which shows the latching state of the lock plate and rat at the time of a standing state. It is a basic diagram which shows the structure of a pillar cover. It is a basic diagram with which it uses for description when a fitting hole and a fitting part fit. It is a basic diagram which shows the internal structure of a pillar cover. It is a basic diagram which shows the movable range of a latch raising arm. It is a basic diagram which shows a mode when a latch raising arm moves to the extreme end position. It is a basic diagram which shows a mode that a latch raising arm pushes up a pushing surface. It is a basic diagram which shows the position contact | abutted by the pushing surface of the other end of a latch raising arm. It is a basic diagram which shows a mode when a latch rotates. It is a basic diagram which shows an internal structure when a headrest case falls back. It is a basic diagram which shows the state of the latch release | release of a lock plate and a rat at the time of a fall state. It is a basic diagram which shows a mode when a headrest main body falls back to the seat back upper part.

Explanation of symbols

3A Seat back top
Retractable headrest for 4A, 4B and 4C vehicles
7A, 7B and 7C headrest body
8A, 8B and 8C recess
11 pillar
14A and 14B pillar cover
80A and 80B cap body (overhang)
94A contact surface
94B other end
94C Edge

Claims (2)

  A mounting structure of a retractable headrest for a vehicle in which a headrest body is rotatably provided by a pillar in a recess formed in an upper portion of a seat back, and a gap is provided between the headrest body and the recess. A mounting structure for a vehicular retractable headrest, wherein a protruding portion provided on an outer periphery of the pillar so as to protrude from a side surface of the headrest body contacts the recess. The projecting portion is selected such that the diameter of the contact surface that contacts the recess is smaller than the diameter of the other end portion provided on the side surface of the headrest body, and the contact surface from the other end portion side is selected. A mounting structure for a vehicular tiltable headrest, characterized in that it is formed in a curved shape as it goes and has a rounded periphery.

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