JP2008173170A - Seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To decrease a gap between the waist of a riding person and a seat back, which is generated as the seat back is inclined backward, and to prevent uncomfortableness of the riding person. <P>SOLUTION: In the vehicle seat 10, the pelvis 60 of the riding person leaning back on the seat back 14 is pressed and supported by a lower frame inside 48 of a pelvis supporting member 42 provided inside the seat back 14. When a motor 32 provided in a reclining mechanism 26 is driven for normal rotation, the seat back 14 is driven backward from a seat cushion 12 by reclining mechanisms 26 and 28, and the pelvis supporting member 42 is relatively moved forward from the seat back 14 by a rotation force transmission 50. Thereby, it is possible to decrease the gap between the pelvis 60 and the lower frame inside 48, which is formed as the seat back 14 is inclined. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat capable of reclining a seat back.

In a conventional vehicle seat (for example, refer to Patent Document 1), a part on the lower end side of the seat back (a pelvic support portion that presses and supports the lumbar portion of the occupant leaning on the seat back) extends vertically with respect to the seat back body. It is possible to slide. The lower end of this pelvic support part is connected to the rear end part of the seat cushion, and when the seat back body tilts rearward with respect to the seat cushion, the pelvis support part moves to the seat back main body in conjunction with this tilting. Slide down. Thus, the occupant's seating posture is stabilized by suppressing the separation between the occupant's waist and the pelvis support part accompanying the tilting.
JP 7-257242 A

  However, in the vehicle seat having the above-described configuration, a gap is formed between the seatback main body and the pelvis support portion (the center portion of the seatback) when the pelvic support portion slides downward with respect to the seatback main body. As a result, the passenger leaning against the seat back may feel uncomfortable.

  An object of the present invention is to obtain a seat that can suppress the separation between the occupant's waist and the seat back that accompanies the tilting of the seat back to the rear side, and can also prevent the passenger from feeling uncomfortable.

  According to a first aspect of the present invention, a seat includes a reclining mechanism for tilting the seat back to the rear side with respect to the seat cushion, the seat back, pressing and supporting a waist portion of an occupant, and the seat back The pressure support member that can be moved relative to the front side, and the relative movement of the pressure support member in conjunction with the tilting of the seat back, and the occupant's waist and the pressure support member accompanying the tilting are separated. And interlocking means for suppressing.

  The “interlocking” described in claim 1 is that the tilting of the seat back and the relative movement of the pressing support member with respect to the seat back are simultaneously performed, and the tilting amount of the seat back and the relative movement amount of the pressing support member are It changes proportionally (including digital changes). Further, the “interlocking” may be performed in the entire tiltable range with respect to the seat cushion of the seat back, or may be performed only in a part of the tiltable range.

  In the seat according to the first aspect, the waist of the occupant is pressed and supported by a pressing support member provided in the seat back. When the seat back is tilted rearward with respect to the seat cushion, the pressing support member is moved relative to the seat back relative to the seat back by the interlocking means. Thereby, separation | spacing with a passenger | crew waist | hip | lumbar part and a press support member (seat back) is suppressed. In addition, since the pressing support member is relatively moved forward with respect to the seat back as described above, no gap is formed in the seat back due to the relative movement. Therefore, it can suppress giving a discomfort to an occupant.

  The seat according to a second aspect of the present invention is the seat according to the first aspect, wherein the reclining mechanism includes a rotating member that is rotated when the seat back is tilted, and the interlocking is performed. The means includes a rotational force transmission mechanism that transmits the rotational force of the rotating member to the pressing support member to move the pressing support member relative to each other.

  In the seat according to claim 2, when the rotating member of the reclining mechanism rotates when the seat back is tilted rearward with respect to the seat cushion, the rotational force is transmitted to the pressing support member by the rotating force transmission mechanism, and the pressing support is performed. The member is moved relative to the seat back to the front side. For this reason, an interlocking means can be made into a simple structure.

  According to a third aspect of the present invention, in the seat according to the second aspect, the pressing support member is rotatable with respect to the seat back, and the rotational force transmission mechanism is provided on the seat back. When the tilt is tilted, the pressing support member is rotated in the tilting direction of the seat back, and the rotation of the rotating member is decelerated and transmitted to the pressing support member so that the pressing support is more than the tilt angle of the seat back. The rotation angle of the member is reduced.

  In the seat according to the third aspect, when the seat back is tilted, the rotational force transmission mechanism rotates the pressing support member in the tilt direction of the seat back. At this time, the rotational force transmission mechanism decelerates the rotation of the rotating member and transmits it to the pressing support member, thereby making the rotation angle of the pressing support member smaller than the tilt angle of the seat back. Thereby, since a press support member moves relatively to the front side to a seat back, a torque transmission mechanism can be made simple composition.

  A seat according to a fourth aspect of the present invention is the seat according to any one of the first to third aspects, further comprising interlocking invalidating means for invalidating the interlocking by the interlocking means. .

  In the seat according to the fourth aspect, the interlock between the seat back by the interlocking means and the pressing support member can be invalidated by the interlock invalidating means. Therefore, the occupant can select the presence or absence of the interlock.

  According to a fifth aspect of the present invention, there is provided a seat according to the fourth aspect, wherein the pressing support member includes a moving member that is relatively moved forward relative to the seat back by the interlocking means, and the moving member. And a supporting member body that presses and supports an occupant's waist, and the interlock invalidating means is in the stopped state, the relative member relative to the moving member. A drive source for preventing the movement and driving the support member body relative to the moving member by driving; an operating means operated by an occupant; and a detecting means for detecting a tilt angle of the seat back; Control means for driving the drive source based on a detection result of the detection means when the seat back is tilted in a state where the operation means is operated. It is characterized in that.

  In the seat according to the fifth aspect, when the seat back is tilted in a state where the operation means is not operated, the moving member is moved relative to the front by the interlocking means. For this reason, since the support member main body, which is prevented from relative movement with respect to the moving member by the drive source, is also moved relative to the seat back together with the moving member, separation between the support member main body and the occupant waist is suppressed. On the other hand, when the seat back is tilted with the operating means being operated by the occupant, the control means drives the drive source based on the tilt angle of the seat back detected by the detecting means. As a result, the support member main body is moved relative to the moving member relative to the rear side of the seat back by the drive source, so that even if the moving member is moved relative to the front side of the seat back in conjunction with the tilting of the seat back. The relative movement of the support member main body to the front side with respect to the seat back is substantially canceled. Thereby, the separation between the support member main body and the occupant waist is allowed, and the interlocking between the seat back and the pressing support member by the interlocking unit is invalidated, so that the interlocking invalidating unit can have a simple configuration.

  A seat according to a sixth aspect of the present invention is the seat according to any one of the first to fifth aspects, wherein the seat back is connected to the seat cushion via the reclining mechanism. A back frame, a back mat whose upper end is pivotally supported on the upper end of the back frame, and whose lower end is swingable forward with respect to the back frame; the back mat connected to the pressing support member; and the back And a back pad for supporting the back of the occupant, which is placed on the front side of the mat and supported by the back mat.

  In the seat according to claim 6, when the pressing support member is relatively moved forward with respect to the seat back in conjunction with the tilting of the back frame relative to the seat cushion, the back connected to the pressing support member. The lower end side of the mat swings forward with respect to the back frame. For this reason, the lower end side of the back pad that covers the front side of the back mat is pushed forward, and the separation between the occupant's lower back and the lower end of the back pad (the portion facing the lower back) is suppressed. Thus, since the back mat that supports the back pad is connected to the pressing support member, the configuration of the seat back can be simplified.

  As described above, in the seat according to claim 1 of the present invention, it is possible to suppress the separation between the occupant waist and the seat back accompanying the tilting of the seat back to the rear side, and it is possible to suppress the occupant from feeling uncomfortable.

  In the seat according to claim 2 of the present invention, the interlocking means can have a simple configuration.

  In the seat according to claim 3 of the present invention, the rotational force transmission mechanism can have a simple configuration.

  In the seat according to claim 4 of the present invention, the occupant can select whether or not the seat back and the pressing support member are interlocked.

  In the seat according to claim 5 of the present invention, the interlock invalidation means can be made simple.

  In the seat according to claim 6 of the present invention, the configuration of the seat back can be simplified.

<First Embodiment>
FIG. 1 is a perspective view showing a configuration of a main part of a vehicle seat 10 as a seat according to the first embodiment of the present invention. 2 is an enlarged perspective view showing the configuration of the main part of the vehicle seat 10 shown in FIG. In the figure, the arrow FR indicates the front direction of the vehicle seat 10, the arrow UP indicates the upward direction of the vehicle seat 10, and the arrow W indicates the width direction of the vehicle seat 10.

  The vehicle seat 10 includes a seat cushion 12 for seating an occupant, and a seat back 14 for supporting an occupant's back that is connected to a rear end portion of the seat cushion 12 so as to be tiltable (reclining). A pair of long plate-like cushion frames 16 and 18 constituting a skeleton part of the seat cushion 12 are provided in both sides in the width direction of the seat cushion 12.

  The cushion frames 16 and 18 extend along the front-rear direction of the seat cushion 12 in a state where the plate thickness direction is along the width direction of the seat cushion 12, and face each other along the width direction of the seat cushion 12. A cushion pad (both not shown) that is elastically deformable via a cushion pan is attached to the upper part of the pair of cushion frames 16 and 18, and the surface of the cushion pad is covered with a skin material (not shown). .

  On the other hand, the seat back 14 has a back frame 20 that constitutes a skeleton part of the seat back 14. The back frame 20 is disposed in both sides in the width direction of the seat back 14 and extends in the height direction (arrow 14H direction) of the seat back 14 and a pair of long plate-like side portions 22 and 24, and the seat back 14 A pipe-like upper portion 25 that is disposed along the width direction (arrow W direction) of the seat back 14 and connected to the upper end portions of the pair of side portions 22 and 24. It is formed in a substantially inverted U shape.

  The seat back 14 is a radial direction of a central axis (a reclining rod 30 to be described later) when tilting with respect to the seat cushion 12 and one in a direction orthogonal to the longitudinal direction of the back frame 20 (arrow 14H direction). The side (the side that supports the back of the occupant, the arrow 14F side) is the front side.

  The lower ends of the pair of side portions 22 and 24 are rear ends of the cushion frames 16 and 18 via reclining mechanisms 26 and 28 for tilting the seat back 14 rearward (reclining operation) with respect to the seat cushion 12. It is connected to the part. A reclining rod 30 (rotating member) for interlocking the reclining mechanisms 26 and 28 is stretched between the reclining mechanisms 26 and 28. The reclining rod 30 extends along the width direction of the seat back 14 and is rotated by a driving force of a motor 32 provided in one reclining mechanism 26. The motor 32 is attached to a gear housing 33 fixed to the lower end portion of the one side portion 22, and the driving force of the motor 32 is reclined via a gear (not shown) provided in the gear housing 33. It is transmitted to the rod 30.

  The rotational force of the reclining rod 30 is decelerated by gears (not shown) provided inside the reclining mechanisms 26 and 28 and transmitted to the pair of side portions 22 and 24 (back frame 20). Thereby, the back frame 20 is rotated around the reclining rod 30 and the seat back 14 is tilted rearward (counter arrow 14F side, arrow B direction) with respect to the seat cushion 12. When the seat back 14 is tilted forward (arrow 14F side, arrow A direction) with respect to the seat cushion 12, the motor 32 is driven in reverse. In the first embodiment, the back frame 20 cannot be tilted forward relative to the seat cushion 12 with respect to the position shown in FIG.

  On the other hand, at the rear part of the seat cushion 12, a pair of cushion frame insides 34, 36 formed in a plate shape is provided. The pair of cushion frame insides 34 and 36 are disposed between the cushion frames 16 and 18 in a state where the plate thickness direction is along the plate thickness direction of the cushion frames 16 and 18. One cushion frame inside 34 is disposed in the vicinity of one cushion frame 16, and a lower end portion thereof is fixed to the one cushion frame 16 through two connecting pins 38 at the front and rear. Further, the other cushion frame inside 36 is disposed in the vicinity of the other cushion frame 18, and a lower end portion thereof is fixed to the other cushion frame 18 through two front and rear connecting pins 38. Further, a cushion rod 40 extending along the width direction of the seat cushion 12 is disposed between the lower ends of the pair of cushion frame insides 34, 36, and the cushion rod 40 allows the pair of cushion frame insides 34, 36 are connected.

  The reclining rod 30 mentioned above penetrates in the plate | board thickness direction in the upper part side of a pair of cushion frame inside 34,36, and the pelvis support member 42 as a press support member arrange | positioned in the lower end part of the seat cushion 12 is a pair. The recliner rod 30 is rotatably supported between the cushion frame insides 34 and 36.

  The pelvis support member 42 has a pair of back frame insides 44 and 46 which are formed in a plate shape and overlap with the cushion frame insides 34 and 36 in the plate thickness direction, respectively. The reclining rod 30 penetrates in the thickness direction on the lower side of the pair of back frame insides 44 and 46.

  The pelvis support member 42 has a lower frame inside 48 that connects the pair of back frame insides 44 and 46 in the vehicle width direction. The lower frame inside 48 is formed in a long plate shape and extends along the width direction of the seat back 14 in a state in which the thickness direction is along the front-rear direction of the seat back 14, and both longitudinal end portions are back frames. The upper side of the insides 44 and 46 is coupled to the rear ends of the back frame insides 44 and 46.

  Further, on the lower side of one of the back frame insides 44, there is provided a rotational force transmission mechanism 50 having basically the same configuration as the reclining mechanisms 26, 28 described above. The rotational force transmission mechanism 50 is for rotating the pelvis support member 42 in conjunction with the tilting of the seat back 14 relative to the seat cushion 12. The reclining rod 30 passes through the central portion of the rotational force transmission mechanism 50, and the rotational force transmission mechanism 50 is disposed coaxially with the reclining mechanisms 26 and 28.

  A gear (not shown) is provided inside the rotational force transmission mechanism 50, and when the reclining rod 30 is rotated by the motor 32, the rotational force of the reclining rod 30 is decelerated by the rotational force transmission mechanism 50 and one of the backs. It is transmitted to the frame inside 44 (pelvis support member 42). Thereby, the pelvis support member 42 is rotated around the reclining rod 30.

  Here, when the reclining rod 30 is rotated, the seat back 14 is tilted with respect to the seat cushion 12 by the reclining mechanisms 26 and 28 as described above. The pelvis support member 42 is rotated in the same direction as the tilting direction. Moreover, the reduction ratio of the rotational force transmission mechanism 50 is set to be larger than the reduction ratio of the reclining mechanisms 26 and 28, and the rotation speed of the pelvis support member 42 is greater than the rotation speed (tilting speed) of the seat back 14. Is set too late. That is, since the pelvis support member 42 is rotated with a lag with respect to the seat back 14, the rotation angle of the pelvis support member 42 is smaller than the tilt angle of the seat back 14.

  For this reason, when the seat back 14 (back frame 20) is tilted rearward (counter arrow 14F side, arrow B direction) with respect to the seat cushion 12, it is interlocked with the tilt (at the same time as the tilt). ) The pelvis support member 42 is moved relative to the back frame 20 in the forward direction (arrow 14F side, arrow A direction). Further, when the back frame 20 is tilted forward (arrow 14F side, arrow A direction) with respect to the seat cushion 12, the pelvis support member 42 is linked to the tilt (at the same time as the tilt). 20 relative to the rear side (counter arrow 14F side, arrow B direction).

  On the other hand, a back mat 52 is provided at the center of the seat back 14 above the pelvis support member 42. The back mat 52 is formed in a metal mesh shape with a metal wire, and is disposed along the height direction of the seat back 14. At the upper end portion of the back mat 52, two hook portions 53 bent in a U shape toward the lower side are provided, and these hook portions 53 are provided at both ends of the upper portion 25 of the back frame 20. It is hooked on the upper wire 54 spanned between the parts. As a result, the upper end portion of the back mat 52 is rotatably supported by the back frame 20 via the upper wire 54, and the back mat 52 can swing around the upper wire 54.

  The lower end of the back mat 52 is disposed on the front side of the lower frame inside 48 of the pelvis support member 42. An L-shaped connecting piece 56 is provided on the front surface of the lower frame inside 48, and the lower end portion of the back mat 52 is rotatable with respect to the lower frame inside 48 (pelvis support member 42) by the connecting piece 56. It is connected. Therefore, as described above, when the pelvic support member 42 is moved (rotated) relative to the front side with respect to the back frame 20, the back mat 52 moves forward with respect to the back frame 20 together with the pelvis support member 42. Relative movement (oscillation).

  When the back mat 52 swings, the back mat 52 is moved relative to the upper wire 54 to the upper side of the seat back 14, but the back mat 52 is formed at the upper end as described above. Since the U-shaped bent portion is hooked on the upper wire 54, the relative movement of the back mat 52 with respect to the upper wire 54 is allowed.

  On the other hand, an elastically deformable back pad 58 is attached to the front side of the pelvic support member 42 and the back mat 52 as shown in FIG. The back pad 58 is in contact with the lower frame inside 48 of the pelvis support member 42 at the lower end side and is wound around the reclining rod 30 at the lower end portion. The surface of the back pad 58 is covered with a non-illustrated skin material having elasticity, and an occupant leaning against the seat back 14 can pass the back mat 52 and the pelvis support member 42 (lower frame) through the skin material and the back pad 58. It is supported by the inside 48). In addition, the lower frame inside 48 is disposed at a position facing the upper portion of the pelvis 60 in the occupant's lumbar region, and the occupant leaning against the seat back 14 is pressed and supported by the upper portion of the pelvis 60 by the lower frame inside 48.

  Here, as described above, when the seat back 14 is tilted rearward with respect to the seat cushion 12, the pelvis support member 42 and the back mat 52 are relatively moved forward with respect to the back frame 20. Therefore, the distance between the lower frame inside 48 and the pelvis 60 is maintained at substantially the same distance as before the tilting (the separation between the lower frame inside 48 and the pelvis 60 is suppressed).

  In addition, when the pelvis support member 42 and the back mat 52 are moved relative to the front side relative to the back frame 20, as shown in FIG. 4, the lower side of the back pad 58 and the outer skin material are connected to the lower frame inside 48 and the back frame. The mat 52 is pushed out to the front side (arrow 14F side) of the back frame 20. Therefore, the pelvis 60 of the occupant is pressed and supported by the lower frame inside 48 through the back mat 52 and the skin material in substantially the same posture as before the tilting.

  A clutch (not shown) is provided in the rotational force transmission mechanism 50 described above, and when the seat back 14 is tilted further to the rear side than the position shown in FIG. The interlock between the seat back 14 and the pelvis support member 42 is released by the clutch.

  Next, the operation of the first embodiment will be described.

  In the vehicle seat 10 configured as described above, the pelvis 60 of the occupant leaning against the seat back 14 is pressed and supported by the lower frame inside 48 of the pelvis support member 42 provided in the seat back 14.

  When the motor 32 provided in the reclining mechanism 26 is driven to rotate forward, the seat back 14 is tilted rearward with respect to the seat cushion 12 by the reclining mechanisms 26, 28, and the pelvis is rotated by the rotational force transmission mechanism 50. The support member 42 is moved relative to the seat back 14 toward the front side. For this reason, the separation between the pelvis 60 and the lower frame inside 48 due to the tilting of the seat back 14 is suppressed, and the pelvis 60 is pressed and supported by the lower frame inside 48 in substantially the same posture as before the tilting. Thereby, since it can suppress that the pelvis 60 inclines to the back side with the said tilting, a passenger | crew's seating state can be stabilized.

  Moreover, in the vehicle seat 10, the pelvis support member 42 provided in the seat back 14 is relatively moved forward with respect to the seat back 14, so that the surface (front surface) of the seat back 14 is caused by the relative movement. No gap is formed on the surface. Therefore, it is possible to prevent the passenger from feeling uncomfortable and improve the appearance.

  In the vehicle seat 10, the back mat 52 that supports the back pad 58 is connected to the pelvis support member 42, and when the pelvis support member 42 moves relative to the seat back 14, the back mat 52. The pelvis support member 42 moves relative to the seat back 14 (swings). For this reason, the back pad 58 is pushed forward entirely from the lower end side by both the pelvic support member 42 and the back mat 52, so that the back pad 58 is locally pushed forward only by the pelvic support member 42. It is possible to reduce the uncomfortable feeling given to the occupant compared to the case where the vehicle is operated. Moreover, since it is not necessary to provide a special member for supporting the lower end portion of the back mat 52, the configuration of the seat back 14 can be simplified.

  Further, in the vehicle seat 10, the rotational force of the reclining rod 30 spanned between the reclining mechanisms 26, 28 is transmitted to the pelvis support member 42 by the rotational force transmission mechanism 50, and the pelvis support member 42 is transferred to the seat back 14. On the other hand, it is moved relative to the front side. For this reason, the seat back 14 and the pelvis support member 42 can be interlocked with a simple configuration.

  Furthermore, in this vehicle seat 10, the rotational force transmission mechanism 50 has basically the same configuration as the reclining mechanisms 26 and 28, and the reduction ratio of the rotational force transmission mechanism 50 is greater than the reduction ratio of the reclining mechanisms 26 and 28. Is set to be large, the relative movement between the seat back 14 and the pelvis support member 42 is established. Therefore, the seat back 14 and the pelvis support member 42 can be relatively moved with a simple configuration.

  In the first embodiment, the rotational force of the reclining rod 30 is transmitted to the pelvis support member 42 via the rotational force transmission mechanism 50 having basically the same configuration as the reclining mechanisms 26 and 28, whereby the pelvis support member. However, the present invention is not limited to this. For example, the pelvis support member 42 is rotated by transmitting the rotational force of the reclining rod 30 to the pelvis support member 42 via the link mechanism. It may be. Further, for example, the pelvis support member 42 may be moved relative to the seat back 12 by being connected to the vehicle body side via a link mechanism. Also in this case, the rotational force transmission mechanism 50 can be omitted.

  In the first embodiment, the pelvis support member 42 is rotated with respect to the seat back 14. However, the configuration is not limited thereto, and the pelvis support member 42 is slid with respect to the seat back 14. It is good.

  Further, in the first embodiment, the back mat 52 is configured such that the hook portion 53 provided at the upper end portion is hooked on the upper wire 54 and relative movement with respect to the upper wire 54 is allowed. For example, the configuration shown in FIG. 5 may be used.

  That is, in the configuration shown in FIG. 5, the upper wire 54 is omitted, and the plate-like upper frame 62 is stretched between the end portions of the upper portion 25 of the back frame 20. Two connecting members 64 made of resin or the like are attached to the front surface of the upper frame 62, and through holes that pass through in the vertical direction are formed in these connecting members 64. Further, the back mat 52 does not have the hook portion 53, and the upper end portion of the back mat 52 is inserted into the through hole of the connecting member 64 so as to be slidable in the vertical direction. Even in this configuration, it is possible to allow the upper frame 62 to move relative to the upper side of the back mat 52. Moreover, the upper frame 62 can improve the rigidity of the back frame 20.

In the first embodiment, the seat back 14 is tilted by the electric reclining mechanisms 26 and 28. However, the invention is not limited thereto, and the reclining mechanism may be a manual type.
<Second Embodiment>
Next, a second embodiment of the present invention will be described. In addition, about the structure and effect | action fundamentally similar to the said 1st Embodiment, the same sign as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

  FIG. 6 is a perspective view showing a partial configuration of a vehicle seat 70 as a seat according to the second embodiment of the present invention. The vehicle seat 70 has basically the same configuration as that of the vehicle seat 10 according to the first embodiment, but the pelvis support member 42 (pressing support member) of the vehicle seat 70 has a lower The frame inside 48 (the main body of the pelvis support member 40, the support member main body) and one back frame inside 44 (moving member) are separated.

  A plate-like rotation support piece 48A extends from one longitudinal end of the lower frame inside 48 (the end on the back frame inside 44 side) toward the front side of the seat back 14 (in the direction of arrow 14F). The rotation support piece 48A is disposed on the inner side in the width direction of the seat back 14 with respect to the back frame inside 44 and overlaps in the plate thickness direction, and is a convex portion (not shown) provided on the end surface on the back frame inside 44 side. Is fitted in a recess formed in the back frame inside 44. These convex portions and concave portions are curved in a circular arc shape concentric with the reclining rod 30, so that the rotation support piece 48 </ b> A, that is, the lower frame inside 48 (the main body portion of the pelvis support member 42, the main body of the support member). Is supported so as to be rotatable about the reclining rod 30 forward (in the direction of arrow A) and rearward (in the direction of arrow B) relative to the back frame inside 44.

  Further, the rotation support piece 48A is formed with a gear hole 72 that penetrates the rotation support piece 48A in the thickness direction. The gear hole 72 is curved in a circular arc shape (fan shape) concentric with the reclining rod 30, and gear teeth 72 </ b> A are formed in an arc-shaped portion on the inner peripheral portion thereof. A pinion gear 74 disposed in the gear hole 72 is engaged with the gear teeth 72A. The pinion gear 74 is rotatably attached to the back frame inside 44 and is rotated by a motor 76 as a drive source attached to the back frame inside 44. When the pinion gear 74 is rotated, the lower frame inside 48 is rotated relative to the back frame inside 44. When the motor 76 is stopped, the lower frame inside 48 is prevented from rotating relative to the back frame inside 44 by the motor 76.

  Further, a control device 78 as a control means is electrically connected to the motor 76 described above. The control device 78 includes an ECU and a driver, and controls power supply to the motor 76. Further, the motor 76 is provided with detection means 77 (for example, a Hall IC) for detecting the number of rotations of the motor 76, and the control device 78 determines the amount of rotation of the motor 76 based on the detection result of the detection means 77. And a rotation amount (here, a rotation angle) of the lower frame inside 48 with respect to the back frame inside 44 is detected based on the rotation amount.

  In addition, the motor 32 of the reclining mechanism 26 is electrically connected to the control device 78 via a reclining switch 80 operated by an occupant. The control device 78 supplies power to the motor 32 in response to the operation of the reclining switch 80, so that the motor 32 is rotated forward or reverse. Accordingly, the seat back 14 is tilted forward or rearward with respect to the seat cushion 12. In this embodiment, a detection means 79 (for example, a Hall IC) for detecting the rotation speed of the motor 32 is provided in the motor 32, and the control device 78 is based on the detection result of the detection means 79. Is detected, and the amount of tilting (here, the tilting angle) of the seat back 14 relative to the seat cushion 12 is detected based on the amount of rotation.

  Further, the control device 78 is connected to a selection switch 82 as an operation means operated by an occupant. The control device 78 is configured to drive the motor 32 when the reclining switch 80 is operated in a state where the selection switch 82 is turned ON (a state where the operation means is operated).

  Specifically, as shown in FIGS. 7A and 7B, the seat back 14 moves rearward (counter arrow 14F side, arrow B direction) with respect to the seat cushion 12 by operating the reclining switch 80. When tilted, the back frame inside 44 is rotated relative to the seat back 14 forward (arrow 14F side, arrow A direction) by the rotational force transmission mechanism 50. At this time, the controller 78 The motor 32 is driven to rotate the lower frame inside 48 to the rear side (counter arrow 14A side, arrow B direction) with respect to the back frame inside 44. Then, the control device 78 determines the tilt angle of the seat back 14 with respect to the seat cushion 12 based on the detection results of the detection means 77 and the detection means 79 and the rear frame inside 48 toward the rear side with respect to the back frame inside 44. The rotation angle is detected, and the drive of the motor 32 is controlled so that the lower frame inside 48 (the main body of the pelvis support member 42) does not move relative to the seat back 14.

  Next, the operation of the second embodiment will be described.

  In the vehicle seat 70 having the above configuration, normally (when the selection switch 82 is turned off), when the seat back 14 is tilted rearward with respect to the seat cushion 12, the rotational force transmission mechanism 50 The back frame inside 44 is moved (rotated) relative to the seat back 14 toward the front side. Therefore, the lower frame inside 48 (main part of the pelvis support member 42) that is prevented from being moved (rotated) relative to the back frame inside 44 by the motor 76 is also moved forward relative to the seat back 14 together with the back frame inside 44. It is moved, and the separation between the lower frame inside 48 and the pelvis 60 of the occupant is suppressed.

  On the other hand, when the seat back 14 is tilted rearward with respect to the seat cushion 12 in a state where the selection switch 82 is turned on by the occupant, the control device 78 causes the motor 78 to operate based on the detection results of the detection means 77 and 79. 76 is driven. As a result, the lower frame inside 48 is moved relative to the back frame inside 44 relative to the back of the seat back 14 by the motor 76, so that the back frame inside 44 moves relative to the seat back 14 in conjunction with the tilt of the seat back 14. Even if it is relatively moved to the front side, the relative movement of the lower frame inside 48 to the front side with respect to the seat back 14 is substantially canceled. Thereby, separation between the lower frame inside 48 and the pelvis 60 is allowed.

  That is, in this vehicle seat 70, when the selection switch 82 is turned ON, the interlocking between the lower frame inside 48 (the pelvis support member 42 main body) and the seat back 14 is substantially invalidated. Therefore, the occupant can freely select the presence or absence of the interlock by operating the selection switch 82.

  In the second embodiment, the controller 78 detects the number of rotations of the motors 32 and 76 based on the detection results of the detection means 77 and 79 (for example, Hall IC) provided in the motors 32 and 76. However, the present invention is not limited to this, and the control device 78 may detect the rotational speed of the motors 32 and 76 based on the ripple current of the motors 32 and 76. In this case, the control device 78 itself becomes the detection means.

  In the second embodiment, the motor 76, the selection switch 82, the detection means 79, and the control device 78 constitute the interlock invalidation means. However, the present invention is not limited to this. For example, the rotational force transmitted by the rotational force transmission mechanism 50 is reduced. The interlock invalidation means may be constituted by a clutch capable of releasing transmission and an operation means (button, lever, etc.) for the passenger to operate the clutch.

  In the first embodiment and the second embodiment, the case where the present invention is applied to a vehicle seat has been described. However, the present invention is also applied to an aircraft seat, a furniture seat, and the like. Is possible.

It is a perspective view showing composition of a principal part of a vehicular seat concerning a 1st embodiment of the present invention. It is an expansion perspective view showing the composition of the principal part of the vehicular seat concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view for showing the positional relationship between the pelvis and the pelvis support member in a state where the seat back is raised in the vehicle seat according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a positional relationship between the pelvis and the lower frame inside in a state where the seat back is tilted backward in the vehicle seat according to the first embodiment of the present invention. It is a perspective view which shows the modification of the 1st Embodiment of this invention. It is a perspective view which shows the structure of the principal part of the vehicle seat which concerns on the 2nd Embodiment of this invention. The structure of the principal part of the vehicle seat which concerns on the 2nd Embodiment of this invention is shown, (A) is a longitudinal cross-sectional view in the state in which the seat back stood up, (B) is the seat back tilted backward. FIG. 5 is a longitudinal sectional view showing a state in which the interlock between the seat back and the lower frame inside is disabled.

Explanation of symbols

10 Vehicle seat (seat)
12 Seat cushion 14 Seat back 20 Back frame 26, 28 Reclining mechanism 30 Reclining rod (rotating member)
42 Pelvic support member (pressing support member)
44 Back frame inside (moving member)
48 Lower frame inside (support member body)
50 Rotational Force Transmission Mechanism 52 Back Mat 58 Back Pad 70 Vehicle Seat (Seat)
76 Motor (drive source)
78 Control device (control means)
79 Detection means 82 Selection switch (operation means)

Claims (6)

A reclining mechanism for tilting the seat back to the rear with respect to the seat cushion;
A pressing support member that is provided on the seat back and presses and supports the occupant's waist, and is relatively movable forward with respect to the seat back;
Interlocking means for relatively moving the pressing support member in conjunction with the tilting of the seat back and suppressing the separation between the occupant waist and the pressing support member accompanying the tilting;
Having a seat.   The reclining mechanism includes a rotating member that is rotated when the seat back is tilted, and the interlocking unit transmits the rotational force of the rotating member to the pressing support member to move the pressing support member relative to the reclining mechanism. The seat according to claim 1, further comprising a rotational force transmission mechanism.   The pressing support member is rotatable with respect to the seat back, and the rotational force transmission mechanism rotates the pressing support member in the tilt direction of the seat back when the seat back tilts. The seat according to claim 2, wherein the rotation angle of the pressing support member is made smaller than the tilting angle of the seat back by decelerating the rotation of the rotation member and transmitting it to the pressing support member.   The seat according to any one of claims 1 to 3, further comprising interlocking invalidating means for invalidating the interlocking by the interlocking means.   The pressing support member is movable relative to the seat back relative to the seat back by the interlocking means, and is movable relative to the rear side of the seat back relative to the moving member and supports the occupant waist. The interlock invalidating means prevents the relative movement of the support member main body with respect to the moving member in a stopped state, and drives the support member main body with respect to the moving member in a stopped state. When the seat back is tilted in a state where the operating source is operated, an operating means operated by an occupant, a detecting means for detecting a tilt angle of the seat back, and the operating means being operated. The seat according to claim 4, further comprising a control unit that drives the drive source based on a detection result of the detection unit.   The seat back is supported by a back frame coupled to the seat cushion via the reclining mechanism, and an upper end side thereof is rotatably supported on an upper end side of the back frame, and swings forward with respect to the back frame. The lower end side which is enabled has a back mat connected to the pressing support member, and a back pad for supporting the back of an occupant which is covered on the front side of the back mat and supported by the back mat. The seat according to any one of claims 1 to 5.

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