JP6687853B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat capable of switching a seat cushion state and a seat back state to a dive down state or a hip up state.

  Conventionally, the seat cushion and the seat back are placed in a normal state when an occupant is seated, and the seat cushion is arranged closer to the floor than in the normal state, and the seat back is folded forward with respect to the seat cushion. There is known a vehicle seat that can be switched between a dive-down state in which the seat cushion is in a dive-down state and a hip-up state in which a rear end portion of the seat cushion is located higher than a front end portion in a normal state (see Patent Document 1). . Specifically, in this technique, a vehicle seat includes a first link (rear link leg 10) rotatably connected to a first shaft supported on a floor, and a first link that rotates around a first shaft. A second link (base 23) that is movably connected and is supported on the floor, and a third link that is rotatably connected to the second link via a third shaft and constitutes a part of the seatback 5. The (hinge 24) is rotatably connected to the third link via a fourth shaft, and is fixed to the fourth link (seat body 4) forming a part of the seat cushion, the fourth link and the floor. And a fifth link rotatably connected to the member.

  The third axis, which is the center of rotation of the seat back, is arranged above the second axis. Further, the third shaft is arranged at the same position in the vertical direction as the seat cushion in the normal state.

Japanese Patent No. 4223495

  In the field of vehicle seats, it is desired to be able to switch the state of the vehicle seat from a normal state to a dive-down state or a hip-up state with a configuration different from the conventional one described above.

  Therefore, an object of the present invention is to make it possible to switch the state of a vehicle seat from a normal state to a dive-down state or a hip-up state with a configuration different from the conventional one.

In order to solve the above-mentioned problems, the vehicle seat according to the present invention has a seat cushion and a seat back in a normal state when an occupant is seated, and the seat cushion is closer to the floor than in the normal state. And a hip in which the rear end portion of the seat cushion is located higher than the front end portion in the dive-down state in which the seat back is folded forward with respect to the seat cushion and in the normal state. It can be switched to an up state, is rotatable around a first shaft supported on the floor, and is supported by the floor on a first link and the first link via a second shaft. A second link that is rotatably connected and that is rotatable around the second axis together with the seat back when the state is switched, and a third link provided to the second link. Is rotatably connected via a third link that forms a part of the seat cushion, and is rotatably connected to the third link through a fourth shaft, and is supported by the floor. A fourth link rotatable about a fifth axis.
The second shaft serves as a center of rotation of the seat back when the normal state is switched to the dive down state.

  According to this configuration, the state of the vehicle seat can be switched from the normal state to the dive-down state or the hip-up state with a configuration different from the conventional one. Further, compared to the conventional structure in which the third shaft, which is the connecting portion of the second link and the third link, is the center of rotation of the seat back, the second shaft, which is the connecting portion of the first link and the second link, is Since the seat back is used as the center of rotation, for example, the height position of the rear surface of the seat back in the dive-down state can be set to a position lower than the conventional position.

  Further, the third shaft may be arranged above the second shaft.

  According to this, when switching from the normal state to the dive-down state, the seat back rotates together with the second link about the second shaft, so that the third link connected to the third shaft is pushed forward. At the same time, the fourth shaft of the fourth link rotates so as to sink in the front obliquely downward direction. Therefore, the seat cushion, a part of which is formed by the third link, can be sunk toward the front and diagonally lower than in the normal state, so that the amount of rearward protrusion of the seat cushion with respect to the seat back should be reduced. Therefore, the space behind the vehicle seat in the dive-down state can be widened.

  The second shaft, which is the center of rotation of the seat back, may be disposed below the seat cushion in the normal state.

  According to this, since the second shaft, which is the center of rotation of the seat back, is arranged below the seat cushion in the normal state, the center of rotation of the seat back is the same as that of the seat cushion in the conventional normal state. Compared with the structure arranged at the height position, the position of the rear surface of the seat back folded in the dive-down state can be lowered and the upper space can be widened.

  Further, in the dive-down state, the fourth link may be located behind the front end of the seat cushion.

  According to this, in the dive-down state, since the fourth link does not project further than the front end of the seat cushion, it is possible to prevent the occupant from touching the fourth link.

  Further, the vehicle seat may include a first urging member that urges the fourth link forward.

  According to this, the occupant's operation can be assisted by the urging force of the first urging member when switching from the normal state to the dive-down state, or from the normal state to the hip-up state.

  Further, the vehicle seat may include a second biasing member that biases the first link forward.

  According to this, when switching from the normal state to the hip-up state, the occupant's operation can be assisted by the urging force of the second urging member.

  Further, the vehicle seat has one end rotatably connected to one of the second link and the third link, and the orientations of the second link and the third link with respect to the first link are different from each other. An attitude regulating link that regulates the movement of the second link and the third link may be provided so as to be determined.

  According to this, when switching from the normal state to the hip-up state, free movements of the second link and the third link are regulated by the posture regulation links and the directions of the respective links are determined, so that the switching operation can be performed easily. You can

  Further, the vehicle seat can switch the states of the second link and the third link between a regulated state in which movement is regulated by the posture regulation link and a released state in which regulation by the posture regulation link is released. It may be provided with a different regulation switching mechanism.

  According to this, when switching from the normal state to the hip-up state, the movement of the second link and the third link is regulated by the posture regulation link, so that the switching operation can be easily performed. In addition, when the normal state is switched to the dive-down state, the posture regulating link does not restrain the movement of the second link and the third link, so that the switching operation can be easily performed.

  Further, the regulation switching mechanism fixes the position of the one end of the posture regulating link to the one link in the regulated state, and fixes the one end of the posture regulating link to the one link in the released state. May be configured to be movable with respect to.

  According to this, the operation of switching to each state can be easily performed.

  Further, the one link has a first portion extending from the second shaft to the third shaft, and a second portion rotatably connected to the first portion, and the regulation switching mechanism is The rotation of the second part with respect to the first part may be restricted in the restricted state, and the restriction of rotation of the second part with respect to the first part may be released in the released state. .

  According to this, the operation of switching to each state can be easily performed.

  When the vehicle seat includes a sixth shaft that rotatably supports the other end of the posture restriction link, the restriction switching mechanism sets the sixth shaft to the first position in the restricted state. It may be configured to maintain and move the sixth shaft from the first position to a second position different from the first position in the released state.

  According to this, the operation of switching to each state can be easily performed.

  Further, when the vehicle seat includes a sixth shaft that rotatably supports the other end of the posture regulating link, the posture regulating link rotates on the one link via the seventh shaft. A first beam portion operably connected to the first beam portion, and a second beam portion rotatably provided around the sixth axis and movable with respect to the first beam portion. The axial distance from the sixth axis to the seventh axis may be maintained constant in the restricted state, and the axial distance may be variable in the released state.

  According to this, the operation of switching to each state can be easily performed.

  The other end of the posture regulation link may be rotatably connected to the floor via a sixth shaft.

  According to this, for example, as compared with the structure in which the other end of the posture regulating link is connected to the first link or the fourth link, when the movement of the second link or the like is regulated by the posture regulating link, the first link or the fourth link The load on the link can be suppressed.

  According to the present invention, the state of the vehicle seat can be switched from the normal state to the dive-down state or the hip-up state with a configuration different from the conventional one.

  Further, according to the present invention, by disposing the third shaft above the second shaft, in the dive-down state, the seat cushion can be sunk downward and obliquely forward as compared with the normal state. Therefore, the amount of rearward protrusion of the seat cushion with respect to the seat back can be reduced to widen the space behind the vehicle seat.

  Further, according to the present invention, by arranging the second shaft, which is the center of rotation of the seat back, below the seat cushion in the normal state, the center of rotation of the seat back is the seat cushion in the normal state as in the past. Compared with the structure arranged at the same height position, the position of the rear surface of the seat back folded in the dive-down state can be lowered, and the upper space can be widened.

  Further, according to the present invention, in the dive-down state, the fourth link is located behind the front end of the seat cushion, so that it is possible to prevent the occupant from touching the fourth link.

  Further, according to the present invention, by providing the first biasing member that biases the fourth link forward, the normal state is switched to the dive down state, or the normal state is switched to the hip-up state or the like. At this time, the occupant's operation can be assisted by the urging force of the first urging member.

  Further, according to the present invention, by providing the second urging member that urges the first link toward the front, when the normal state is switched to the hip-up state, the occupant is urged by the urging force of the second urging member. The operation of can be assisted.

  Further, according to the present invention, by providing the posture restriction links, the free movement of the second link and the third link is restricted by the posture restriction links when switching from the normal state to the hip-up state, and the orientation of each link is controlled. Is determined, the switching operation can be easily performed.

  Further, according to the present invention, by providing the regulation switching mechanism, the regulation of the movement of the second link and the third link by the posture regulation link can be appropriately released, so that the operation for switching to each state can be easily performed. You can

  Further, according to the present invention, the other end of the posture regulating link is rotatably connected to the floor via the sixth shaft, so that, for example, the other end of the posture regulating link is connected to the first link or the fourth link. In comparison with the structure in which the attitude regulating link regulates the movement of the second link or the like, the load applied to the first link or the fourth link can be suppressed.

It is a figure which shows the vehicle seat of a normal state in 1st Embodiment. It is a figure which shows the vehicle seat of a hip-up state in 1st Embodiment. It is a figure which shows the vehicle seat in a dive-down state in 1st Embodiment. It is the figure which shows the vehicle seat of a normal state in 2nd Embodiment (a), and sectional drawing (b) which shows a regulation switching mechanism. It is a figure which shows the vehicle seat of a hip-up state in 2nd Embodiment. It is a figure which shows the vehicle seat in a dive-down state in 2nd Embodiment. It is a figure which shows the vehicle seat of a normal state in 3rd Embodiment. It is a figure which shows the vehicle seat of a hip-up state in 3rd Embodiment. It is a figure which shows the vehicle seat of a dive down state in 3rd Embodiment. It is a figure which shows the vehicle seat of a normal state in 4th Embodiment. It is a figure which shows the vehicle seat of a hip-up state in 4th Embodiment. It is a figure which shows the vehicle seat in a dive-down state in 4th Embodiment. It is a figure which shows the vehicle seat of a normal state in 5th Embodiment.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a vehicle seat S, which is an example of a vehicle seat, is a seat used in the second row of three-row seats, and mainly includes a seat cushion S1 and a seat back S2. I have it. In the present invention, front, rear, left and right, and upper and lower sides are based on an occupant sitting on a seat.

  The seat cushion S1 and the seat back S2 respectively include a frame, a cushion material, and a skin material (not shown). The frame is a member that forms the skeleton of the seat cushion S1 and the seat back S2, and is made of metal or the like. The cushion material is made of urethane foam and is supported by the frame. The skin material is made of synthetic leather or cloth, and is attached to the frame so as to cover the cushion material.

  A first latch device S21 is provided on either the left or right side surface of the seat back S2. The first latch device S21 is attachable to and detachable from a striker (not shown) provided on the side wall of the vehicle body. Specifically, the first latch device S21 includes a latch (not shown) that can be engaged with the striker. The latch is rotatably provided in the housing of the first latch device S21, and is operated by an occupant (not shown) to be disengaged from the striker. It is configured to engage with the striker.

  The vehicle seat S can switch the state of the seat cushion S1 and the seat back S2 between a normal state shown in FIG. 1, a hip-up state shown by a solid line in FIG. 2, and a dive-down state shown by a solid line in FIG. The state switching mechanism 1 is provided. Here, the normal state refers to a state when the occupant is seated. In the normal state, the upper surface (seat surface) of the seat cushion S1 faces substantially upward, and the front surface of the seat back S2 faces substantially forward. Specifically, in the normal state, the front surface of the seat back S2 is oriented at an angle according to the occupant's preference by operating a reclining mechanism (not shown).

  The hip-up state is a state in which the rear end portion of the seat cushion S1 is located higher than the front end portion than in the normal state. In particular, in the present embodiment, in the hip-up state, the upper end portion of the seat back S2 is located in front of the lower end portion, and the lower end portion of the seat back S2 is located above the normal state.

  Further, the dive-down state is a state in which the seat cushion S1 is arranged closer to the floor F than in the normal state, and the seat back S2 is folded forward with respect to the seat cushion S1. In the present embodiment, in the dive down state, the front surface of the seat back S2 is superposed on the upper surface of the seat cushion S1, and the seat back S2 and the seat cushion S1 are arranged substantially parallel to the upper surface of the floor F. .

  The state switching mechanism 1 includes a first link 10, a second link 20, a third link 30, and a fourth link 40 made of metal or the like, a first torsion spring 51 as an example of a first biasing member, and a second biasing member. The second torsion spring 52 as an example of the biasing member is provided. The first link 10 has an elongated base portion 11 and a leg portion 12 extending from the base portion 11 toward the floor F.

  One end of the base portion 11 is rotatably connected to a first bracket B1 fixed to the floor F via a first axis A1. The first axis A1 is supported (fixed) on the floor F via the first bracket B1.

  In the present specification, the floor F also includes a member that is fixed to the floor F and does not move when the vehicle seat S is switched between the normal state, the hip-up state, and the dive-down state. For example, the first bracket B1 described above and each bracket described below are included in the floor F. In addition to this, when the vehicle seat S is supported by, for example, a slider mechanism, the upper rail of the slider mechanism and the like are also included in the floor.

  In the normal state, the base portion 11 extends obliquely rearward and upward from the first axis A1. The leg portion 12 is a portion supported by the floor F. A second latch device 13 that is attachable to and detachable from the striker ST fixed to the floor F is provided at the lower end portion of the leg portion 12. The second latch device 13 has substantially the same structure as the first latch device S21, and includes a latch (not shown) that can be engaged with the striker ST. When the latch is engaged with the striker ST, the first link 10 is fixed (locked) to the floor F, and when the latch is disengaged from the striker ST, the lock is released and the first link 10 is attached to the floor F. It is rotatable about the first axis A1.

  The second link 20 is a long member, and one end of the second link 20 is rotatably connected to the other end of the first link 10 via a second axis A2. In the normal state, the second axis A2 is arranged behind and above the first axis A1 and below the seat cushion S1. In the normal state, the second link 20 extends obliquely rearward and upward from the second axis A2. Specifically, in the normal state, the angle of the second link 20 with respect to the horizontal plane is larger than the angle of the first link 10 with respect to the horizontal plane. In this specification, the angle of the link with respect to the horizontal plane refers to the angle of the straight line connecting the axes (for example, A1 and A2) arranged at each end of the link with respect to the horizontal plane.

  The other end of the second link 20 is rotatably connected to the frame of the seat back S2 via a third axis A3. A reclining mechanism (not shown) is provided between the second link 20 and the seat back S2. The reclining mechanism is attached, for example, around the third axis A3. Accordingly, when the reclining mechanism is not operated by the occupant, the rotation of the seat back S2 with respect to the second link 20 is restricted by the reclining mechanism, and when the reclining mechanism is operated, the restriction is released and the second link 20 is released. On the other hand, the seat back S2 is rotatable about the third axis A3. Then, as will be described in detail later, when the state of the vehicle seat S is switched to each of the normal state, the hip-up state, and the dive-down state, the second link does not operate because the reclining mechanism does not operate. 20 is rotatable about the second axis A2 together with the seat back S2. In particular, as will be described later in detail, when switching from the normal state to the dive down state, the second axis A2 is the center of rotation of the seat back S2.

  The third link 30 is an elongated member that constitutes a part of the frame of the seat cushion S1, and is rotatably connected to the other end of the second link 20 via a third axis A3. In the normal state, the third axis A3 is arranged behind and above the second axis A2. In the normal state, the third link 30 extends obliquely forward and downward from the third axis A3. Specifically, in the normal state, the angle of the third link 30 with respect to the horizontal plane is smaller than the angle of the first link 10 with respect to the horizontal plane.

  The fourth link 40 is a long member, and one end thereof is rotatably connected to the other end of the third link 30 via the fourth axis A4. In a normal state, the fourth axis A4 is arranged in front of and below the third axis A3, and in front of and above the first axis A1 and the second axis A2. In the normal state, the fourth link 40 extends obliquely forward and downward from the fourth axis A4. Specifically, in the normal state, the angle of the fourth link 40 with respect to the horizontal plane is larger than the angle of the first link 10 with respect to the horizontal plane. More specifically, the angle of the fourth link 40 with respect to the horizontal plane is substantially the same as the angle of the second link 20 with respect to the horizontal plane. The entire fourth link 40 is located behind the front end of the seat cushion S1 in any of the normal state, the hip-up state, and the dive-down state.

  The other end of the fourth link 40 is rotatably connected to a second bracket B2 fixed to the floor F via a fifth axis A5. The fifth axis A5 is supported (fixed) on the floor F via the second bracket B2. That is, the fourth link 40 is rotatable about the fifth axis A5 supported by the floor F. The fifth axis A5 is arranged in front of and below the fourth axis A4 in the normal state. The fifth axis A5 is arranged in front of the first axis A1 and at substantially the same position as the first axis A1 in the vertical direction.

  The links 10 to 40 configured as described above and the floor F (including the brackets B1 and B2) form a five-bar link. This five-bar link functions as a five-bar link having two degrees of freedom when the second latch device 13 is disengaged from the striker ST, and when the second latch device 13 is locked to the striker ST, the floor F Also, since the first link 10 can be regarded as one link, it functions as a four-bar link having one degree of freedom.

  As shown in FIG. 2, the floor F is provided with a support member F1 that supports the first link 10 when the vehicle seat S is in the hip-up state. As a result, when the vehicle seat S is in the hip-up state, the support member F1 prevents the first link 10 from falling further forward, and the direction of the first link 10 is defined. Specifically, the support member F1 supports the first link 10 so that the other end (the end on the second axis A2 side) of the first link 10 faces forward and upward. The supporting member F1 may be integrally provided on the front upper end of the first bracket B1.

  When the vehicle seat S is in the hip-up state, the front end of the seat cushion S1 is in contact with the floor F. As a result, when the vehicle seat S is in the hip-up state, the seat cushion S1 supported by the floor F prevents the fourth link 40 from falling further forward, and the orientation of the fourth link 40 is changed. It is prescribed. Specifically, the seat cushion S1 supports the fourth link 40 such that one end portion (end portion on the fourth axis A4 side) of the fourth link 40 faces forward and upward.

  That is, when the vehicle seat S is in the hip-up state, the support member F1 functions as a first defining member that defines the orientation of the first link 10, and the seat cushion S1 defines the orientation of the fourth link 40. It functions as a second regulating member. In the hip-up state, the angle of the first link 10 with respect to the horizontal plane is larger than the angle of the fourth link 40 with respect to the horizontal plane.

  The first torsion spring 51 is a spring that biases the fourth link 40 forward, and has one end engaged with the fourth link 40 and the other end engaged with the second bracket B2 (that is, the floor F). is doing. The second torsion spring 52 is a spring that biases the first link 10 forward, and has one end engaged with the first link 10 and the other end engaged with the first bracket B1 (that is, the floor F). is doing.

  Next, an operation method for switching the state of the vehicle seat S to each state will be described. In the following description, in the figures showing the hip-up state and the dive-down state (in the present embodiment, FIGS. 2 and 3), the vehicle seat S in the normal state is shown by a chain double-dashed line, and each link is Is shown by a line connecting the shafts, and the torsion springs 51 and 52 are not shown.

  When switching the state of the vehicle seat S from the normal state shown in FIG. 1 to the hip-up state shown in FIG. 2, the occupant first operates the operating levers for the respective latch devices S21, 13 to cause the respective latch devices. The lock of S21, 13 is released. As a result, the seat back S2 becomes movable with respect to the side wall of the vehicle body, and the first link 10 becomes rotatable with respect to the floor F. In other words, when the latches S21 and S13 are unlocked, the links 10 to 40 and the floor F function as a five-joint link with two degrees of freedom, so that the seat cushion S1 and the seat back S2 can freely move.

  Then, the occupant lifts the rear end of the seat cushion S1 together with the seat back S2 and pushes the rear end of the seat cushion S1 and the seat back S2 forward. As a result, as shown in FIG. 2, the first link 10 and the fourth link 40 rotate forward. At this time, the rotation of the first link 10 and the fourth link 40 is assisted by the urging force of the first torsion spring 51 and the second torsion spring 52.

  When the first link 10 comes into contact with the support member F1 and the front end of the seat cushion S1 comes into contact with the floor F, rotation of the first link 10 and the fourth link 40 is restricted, and the first link 10 and the fourth link 40 are restrained. The attitude of the link 40 is maintained. When the movements of the first link 10 and the fourth link 40 are restricted in this way, the respective links 10, 40 and the floor F whose movements have been stopped can be regarded as one link. Since this one link and the remaining two links 20 and 30 form a three-joint link with 0 degree of freedom, the postures of the seat cushion S1 and the seatback S2 are held in a hip-up state by the three-joint link. can do. When returning from the hip-up state to the normal state, the first link 10 and the fourth link 40 may be rotated rearward by pulling the seatback S2 rearward.

  When switching the state of the vehicle seat S from the normal state shown in FIG. 1 to the dive-down state shown in FIG. 3, the occupant first operates the operation lever for the first latch device S21 to move the first latch device. The lock in S21 is released, and the second latch device 13 remains in the locked state. As a result, the seat back S2 becomes movable with respect to the side wall of the vehicle body, but the first link 10 remains fixed to the floor F. That is, by unlocking the first latch device S21 and leaving the second latch device 13 in the locked state, the second link 20, the third link 30, the fourth link 40, and the first link The floor F including the link 10 functions as a four-bar link having one degree of freedom.

  Then, when the occupant tilts the seat back S2 forward, the seat back S2 rotates around the second axis A2 together with the second link 20, as shown in FIG. When the second link 20 rotates forward, the second link 20 pushes the third link 30 forward, so that the fourth link 40 rotates forward. At this time, the forward rotation of the fourth link 40 is assisted by the urging force of the first torsion spring 51. As a result, the seat cushion S1 is moved so as to be depressed obliquely forward and downward, and the lower surface of the seat cushion S1 is supported by the floor F. The seat back S2 is folded so as to cover the seat cushion S1 from above and is supported by the seat cushion S1.

  When returning from the dive-down state to the normal state, the third link 30 is rotated by the second link 20 by rotating the second link 20 together with the second link 20 so as to cause the seat back S2 to move backward. Is pulled diagonally upward and backward. As a result, the fourth link 40 connected to the third link 30 rotates rearward, so that the seat cushion S1 can be returned to the normal position.

As described above, according to the vehicle seat S of the present embodiment, the following respective effects can be achieved.
The state of the vehicle seat S can be switched from the normal state to the dive-down state or the hip-up state with a configuration different from the conventional one. In addition, as compared with the conventional structure in which the third shaft, which is the connecting portion of the second link and the third link, is the center of rotation of the seat back, the second portion that is the connecting portion of the first link 10 and the second link 20 is provided. Since the axis A2 is used as the center of rotation of the seat back S2, the height position of the rear surface of the seat back S2 in the dive down state can be set to a position lower than the conventional position.

  Since the third axis A3 is arranged above the second axis A2 in the normal state, when the seatback S2 is rotated forward together with the second link 20 when switching from the normal state to the dive down state, The third link 30 connected to the three axes A3 is pushed forward, and the fourth axis A4 of the fourth link 40 pivots so as to sink forward and obliquely downward. Therefore, since the seat cushion S1 can be made to sunk toward the front and diagonally downward as compared with the normal state, the rearward protruding amount of the seat cushion S1 with respect to the seat back S2 can be reduced, and in the dive down state. The space behind the vehicle seat S can be widened.

  Since the second axis A2, which is the center of rotation of the seat back S2, is disposed below the seat cushion S1 in the normal state, the center of rotation of the seat back is at the same height as the seat cushion in the conventional normal state. Compared with the structure arranged at the position, the position of the rear surface of the seat back S2 folded in the dive-down state can be lowered, and the upper space can be widened.

  Since the fourth link 40 is located behind the front end of the seat cushion S1 in the dive down state, it is possible to prevent the occupant from touching the fourth link 40 in the dive down state.

  Since the first torsion spring 51 that biases the fourth link 40 forward is provided, the first torsion spring 51 is used when switching from the normal state to the dive-down state or from the normal state to the hip-up state. The urging force of 51 can assist the operation of the occupant.

  Since the second torsion spring 52 that biases the first link 10 forward is provided, when the normal state is switched to the hip-up state, the biasing force of the second torsion spring 52 can assist the operation of the occupant. it can.

  Although the first embodiment of the present invention has been described above, the present invention can be appropriately modified and implemented as shown in the following other modes.

[Second Embodiment]
Next, a second embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since the present embodiment is a modification of a part of the structure of the first embodiment described above, the same reference numerals are given to the substantially same constituent elements as those of the first embodiment, and the description thereof will be omitted. It will be omitted.

  As shown in FIG. 4A, the vehicle seat S according to the second embodiment includes a second link 120, an attitude regulation link 60, and a regulation switching mechanism 70, which are different from those in the first embodiment. The second link 120 has a first portion 121 that extends from the second axis A2 to the third axis A3, and a second portion 122 that is rotatably connected to the first portion 121. One end of the second portion 122 is rotatably connected to the first portion 121 via the second axis A2. In the normal state, the second portion 122 extends obliquely forward and upward from the second axis A2.

  The posture regulation link 60 regulates the movement of the second link 120 and the third link 30 so that the orientations of the second link 120 (specifically, the first portion 121) and the third link 30 with respect to the first link 10 are determined. Is a long member. One end of the posture regulation link 60 is rotatably connected to the second portion 122 of the second link 120 via a connection shaft AC. In a normal state, the posture regulation link 60 extends obliquely forward and downward from the connecting shaft AC. The other end of the posture regulation link 60 is rotatably connected to a third bracket B3 fixed to the floor F via a sixth axis A6.

  The sixth axis A6 is supported on the floor F via the third bracket B3, and rotatably supports the other end of the posture regulating link 60. The sixth axis A6 is arranged between the first axis A1 and the fifth axis A5 in the front-rear direction. The sixth axis A6 is arranged at substantially the same position as the first axis A1 in the vertical direction.

  The regulation switching mechanism 70 can switch the state of the second link 120 and the third link 30 between a regulated state in which the movement is regulated by the posture regulating link 60 and a released state in which the regulation by the posture regulating link 60 is released. It is a mechanism. The regulation switching mechanism 70 is configured to regulate the rotation of the second portion 122 with respect to the first portion 121 in the regulated state, and release the regulation of the rotation of the second portion 122 with respect to the first portion 121 in the released state. There is.

  More specifically, as shown in FIG. 4B, the regulation switching mechanism 70 moves the casing 71 fixed to the second portion 122 of the second link 120 and the casing 71 in the axial direction of the second axis A2. A pin 72 that is supported so as to be possible, a spring 73 that biases the pin 72 toward the second link 120, and a wire 74 that is fixed to the pin 72 are provided. The pin 72 penetrates the hole 122A formed in the second portion 122 and is engageable with the hole 121A formed in the first portion 121. The holes 121A and 122A are arranged at positions different from the second axis A2, and are arranged so as to overlap with each other when viewed in the axial direction in the normal state.

  The pin 72 is movable between an engagement position that engages with the hole 121A and a disengagement position that disengages from the hole 121A. The wire 74 has one end fixed to the pin 72 and the other end fixed to an operation lever (not shown). Accordingly, when the occupant operates the operation lever, the wire 74 is pulled, and the pin 72 moves from the engagement position to the disengagement position against the biasing force of the spring 73.

  The structure of the regulation switching mechanism is not limited to the structure shown in FIG. For example, a rotation lock mechanism such as that used in the reclining mechanism may be used as the regulation switching mechanism.

Next, an operation method for switching the state of the vehicle seat S to each state will be described.
When switching the state of the vehicle seat S from the normal state shown in FIG. 4A to the hip-up state shown in FIG. 5, the occupant first operates the operation levers for the respective latch devices S21, 13, The lock of each latch device S21, 13 is released. As a result, the seat back S2 becomes movable with respect to the side wall of the vehicle body, and the first link 10 becomes rotatable with respect to the floor F.

  At this time, the occupant does not operate the operation lever for the regulation switching mechanism 70 and leaves the second portion 122 locked with respect to the first portion 121. Accordingly, the first part 121 and the second part 122 function as an integral part, that is, one second link 120.

  By operating the operation levers as described above, the first link 10, the second link 120, the third link 30, the fourth link 40, and the floor F become a five-bar link as in the first embodiment. However, in the present embodiment, since the second link 120 is connected to the floor F via the attitude regulation link 60, the free movement of the second link 120 is regulated, and the degree of freedom of the five-bar link is 1. ing.

  More specifically, in the present embodiment, the first link 10, the second link 120, the attitude regulating link 60, and the floor F form a four-joint link with one degree of freedom. Therefore, the orientation of the second link 120 (particularly, the first portion 121) with respect to the first link 10 is set to a predetermined orientation at each point in the process of switching the state of the vehicle seat S from the normal state to the hip-up state.

  By thus defining the orientation of the second link 120, when the normal state is switched to the hip-up state, the third axis A3 passes along a predetermined locus. Therefore, the position of the third axis A3 is located at a fixed position at each time point in the process of switching from the normal state to the hip-up state. Accordingly, the orientation of the third link 30 can also be set to a fixed orientation at each point in the process of switching from the normal state to the hip-up state. Therefore, in this mode, the orientations of the second link 120 and the third link 30 are regulated by the posture regulation link 60 at each time point in the process of switching from the normal state to the hip-up state, so that the degree of freedom of the five-section link is 1 Therefore, the switching operation can be easily performed. It should be noted that this action and effect can be similarly obtained when returning from the hip-up state to the normal state.

  When switching the state of the vehicle seat S from the normal state shown in FIG. 4A to the dive-down state shown in FIG. 6, the occupant first locks the first latch device S21 as in the above-described embodiment. The second latch device 13 is released and remains locked. As a result, the first portion 121 of the second link 120, the third link 30, the fourth link 40, and the floor F including the first link 10 function as a four-joint link with one degree of freedom. .

  Further, the occupant operates the operation lever for the regulation switching mechanism 70 to remove the pin 72 shown in FIG. 4B from the hole 121A of the first portion 121. As a result, the first part 121 becomes rotatable with respect to the second part 122. Therefore, when the occupant tilts the seat back S2 forward thereafter, the movement of the first portion 121 is not restrained by the posture regulation link 60, so that it is possible to favorably switch to the dive-down state as in the above embodiment.

As described above, according to the vehicle seat S of the second embodiment, the following effects can be obtained in addition to the effects described above.
Since the other end of the posture regulating link 60 is connected to the sixth axis A6 supported by the floor F, the posture regulating link is compared with the structure in which the other end of the posture regulating link is connected to the first link or the fourth link, for example. When the movement of the second link 120 or the like is regulated by the link 60, the load applied to the first link 10 or the fourth link 40 can be suppressed.

[Third Embodiment]
Next, a third embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since the present embodiment is a modification of a part of the structure of the above-described second embodiment, the same reference numerals are given to the substantially same components as those of the second embodiment, and the description thereof will be omitted. It will be omitted.

  As shown in FIG. 7, the vehicle seat S according to the third embodiment includes a second link 220 and a regulation switching mechanism 80 that are different from those in the second embodiment. The second link 220 has a first portion 121 and a second portion 122 that are substantially similar to those of the second embodiment, and is the second in that the first portion 121 and the second portion 122 are integrally formed. It differs from the embodiment.

  The regulation switching mechanism 80 includes a base member 81 having a groove 82 that supports the sixth shaft A6 so as to be movable in the front-rear direction, and a regulation member 83 that restricts movement of the sixth shaft A6 in the front-rear direction. The base member 81 is fixed to the floor F. The groove 82 is formed so as to extend in the front-rear direction.

  The restriction member 83 is a member having a U-shaped cross section, and is movable in the up-down direction between the restriction position shown in FIG. 7 and the release position shown in FIG. When the restricting member 83 is located at the upper restricting position, the restricting member 83 engages with the sixth axis A6 and maintains the sixth axis A6 at the first position shown in FIG. 7. As a result, the states of the second link 220 and the third link 30 can be brought into the regulated state described above.

  In addition, the regulation member 83 moves from the regulation position to the release position below, so that it deviates from the sixth axis A6, and the sixth axis A6 is moved from the first position to a second position different from the first position (the present embodiment). In the form, it can be moved to a position (front of the first position). As a result, the state of the second link 220 and the third link 30 can be brought to the release state described above.

  Although not shown, the restriction member 83 is biased toward the restriction position by a spring and is connected to the operation lever via a wire. When the operation lever is pulled, the regulation member 83 moves from the regulation position to the release position against the biasing force of the spring, and when the operation lever is released, the regulation member 83 moves from the release position to the regulation position by the spring biasing force. Moving.

Next, an operation method for switching the state of the vehicle seat S to each state will be described.
When switching the state of the vehicle seat S from the normal state shown in FIG. 7 to the hip-up state shown in FIG. 8, the locks of the latch devices S21 and S13 are released, as in the second embodiment. At this time, the operation lever for the regulating member 83 is not operated. As a result, the position of the sixth axis A6 is maintained at the first position, and thus, in the process of switching from the normal state to the hip-up state, the posture regulating link 60 causes the second link 220 and the second link 220 to move, as in the second embodiment. The direction of the 3 link 30 is defined, and the switching operation can be performed favorably.

  When the state of the vehicle seat S is switched from the normal state shown in FIG. 7 to the dive down state shown in FIG. 9, the lock of the first latch device S21 is released and the second latch device is released, as in the second embodiment. Device 13 remains locked. At this time, the operating lever for the regulating member 83 is operated to release the regulation of the longitudinal movement of the sixth shaft A6 by the regulating member 83. As a result, in the process of switching from the normal state to the dive-down state, the other end of the attitude regulating link 60 slides forward together with the sixth axis A6 as the second link 220 rotates forward. The movement of the second link 220 is not restricted by the posture regulation link 60, and the switching operation can be performed well.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since the present embodiment is a modification of a part of the structure of the first embodiment described above, the same reference numerals are given to the substantially same constituent elements as those of the first embodiment, and the description thereof will be omitted. It will be omitted.

  As shown in FIG. 10, the vehicle seat S according to the fourth embodiment is different from the first embodiment in that the support member F1 is not provided, and that the posture regulation link 90 and the regulation switching mechanism 100 are newly added. It is different in that it is provided in.

  The posture regulating link 90 is a long member, and one end of the posture regulating link 90 is rotatably connected to the third link 30 via a connecting shaft AC. The connecting shaft AC is provided on the third link 30 and rotatably supports the posture regulating link 90. In a normal state, the posture regulating link 90 extends obliquely forward and downward from the connecting shaft AC. The posture regulation link 90 has, on one end side, a long hole 91 extending in the longitudinal direction and movably supporting the coupling shaft AC.

  The other end of the posture regulation link 90 is rotatably connected to a fourth bracket B4 fixed to the floor F via a sixth axis A6. The sixth axis A6 is arranged between the first axis A1 and the fifth axis A5 in the front-rear direction. The sixth axis A6 is arranged at substantially the same position as the first axis A1 in the vertical direction.

  The regulation switching mechanism 100 is a latch device that can be attached to and detached from the connecting shaft AC, and is provided at one end of the posture regulation link 90. The regulation switching mechanism 100 has substantially the same structure as the first latch device S21 and includes a latch (not shown) that can be engaged with the connecting shaft AC. In the state where the latch is engaged with the connecting shaft AC, the position of the one end of the posture regulation link 90 is fixed to the third link 30. As a result, the second link 20 and the third link 30 can be brought into the regulated state described above. The latch and the connecting shaft AC may be engaged with each other with some play in the longitudinal direction of the attitude regulating link 90. Further, when the latch is off the connecting axis AC, one end of the attitude regulating link 90 is movable with respect to the third link 30. As a result, the second link 20 and the third link 30 can be brought into the released state described above.

Next, an operation method for switching the state of the vehicle seat S to each state will be described.
When switching the state of the vehicle seat S from the normal state shown in FIG. 10 to the hip-up state shown in FIG. 11, the locks of the respective latch devices S21, 13 are released, as in the first embodiment. At this time, the operation lever for the regulation switching mechanism 100 is not operated. As a result, the position of the one end of the posture regulation link 90 is fixed to the third link 30, so that the posture regulation link 90, the third link 30, the fourth link 40, and the floor F form a four-bar link. Will be configured.

  Therefore, at each point in the process of switching from the normal state to the hip-up state, the orientation of the third link 30 with respect to the fourth link 40 is set to a predetermined orientation by the four-bar link. Specifically, the angle of the third link 30 with respect to the horizontal plane gradually increases as the normal state approaches the hip-up state, and does not decrease during switching from the normal state to the hip-up state.

  Here, since the position of one end (end on the first axis A1 side) of the first link 10 is fixed to the floor F, at each point in the process of switching from the normal state to the hip-up state, The direction is set to a predetermined direction. Therefore, the orientation of the third link 30 with respect to the first link 10 is also set to a predetermined orientation at each point in the process of switching from the normal state to the hip-up state.

  By defining the orientation of the third link 30, the third axis A3 passes on a predetermined locus when switching from the normal state to the hip-up state. Therefore, the position of the third axis A3 is located at a fixed position at each time point in the process of switching from the normal state to the hip-up state. Accordingly, the orientation of the second link 20 can also be fixed at each point in the process of switching from the normal state to the hip-up state. Therefore, in this mode, the orientation of the second link 20 and the third link 30 is regulated by the posture regulating link 90 at each time point in the process of switching from the normal state to the hip-up state, so that the degree of freedom of the five-bar link is 1 Therefore, the switching operation can be easily performed. It should be noted that this action and effect can be similarly obtained when returning from the hip-up state to the normal state.

  When the state of the vehicle seat S is switched from the normal state shown in FIG. 10 to the dive down state shown in FIG. 12, the lock of the first latch device S21 is released and the second latch device S21 is released, as in the first embodiment. Device 13 remains locked. At this time, the operation lever for the regulation switching mechanism 100 is operated to unlock the coupling shaft AC by the regulation switching mechanism 100. As a result, in the process of switching from the normal state to the dive-down state, the connecting shaft AC moves with respect to the attitude regulating link 90 as the third link 30 moves diagonally forward and downward, that is, the attitude. One end of the regulation link 90 moves with respect to the third link 30. Therefore, when switching from the normal state to the dive-down state, the movement of the third link 30 is not restrained by the posture regulating link 90, and thus the switching operation can be performed favorably.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings as appropriate. Since the present embodiment is a modification of part of the structure of the above-described fourth embodiment, components that are substantially the same as those in the fourth embodiment are designated by the same reference numerals, and a description thereof will be given. It will be omitted.

  As shown in FIG. 13, in the vehicle seat S according to the fifth embodiment, instead of the attitude regulation link 90 and the regulation switching mechanism 100 according to the fourth embodiment, a posture regulation different from that of the fourth embodiment. The link 190 and the regulation switching mechanism 200 are provided.

  The posture regulation link 190 has a piston 191 as an example of a first beam portion and a cylinder 192 as an example of a second beam portion. One end of the piston 191 is rotatably connected to the third link 30 via the seventh axis A7. The piston 191 is movably supported by the cylinder 192.

  The cylinder 192 has an opening into which the piston 191 enters at one end, and the other end is rotatably connected to the sixth axis A6. The cylinder 192 is movable with respect to the piston 191 in the axial direction of the piston 191.

  The regulation switching mechanism 200 maintains a constant inter-axis distance from the sixth axis A6 to the seventh axis A7 when the third link 30 or the like is in the regulated state, and when the third link 30 or the like is in the released state. It is configured to make the axial distance variable. Specifically, the regulation switching mechanism 200 mainly includes a pin 210 that penetrates the side wall of the cylinder 192 and engages with a hole formed in the piston 191. The pin 210 is movably supported by a casing (not shown) so that it can move between a position where it engages with a hole formed in the piston 191 and a position where it disengages from this hole. The regulation switching mechanism 200 also includes a spring (not shown) that biases the pin 210 toward the piston 191, and a wire and an operation lever that pulls the pin 210 against the biasing force of the spring.

  According to this aspect, by appropriately operating the operation lever for the regulation switching mechanism 200, the posture regulation link 190 can be made extendable or non-extendable. Therefore, similarly to the operation method of the fourth embodiment, by operating the operation lever for the regulation switching mechanism 200, the operation of switching to each state can be favorably performed.

  In the fifth embodiment, the piston 191 as the first beam portion is movable in the axial direction of the piston 191 with respect to the cylinder 192 as the second beam portion, so that the axial distance is variable. However, the present invention is not limited to this. For example, the axial distance may be made variable by rotatably connecting the first beam section and the second beam section.

  Each shaft (for example, the first shaft A1) in the embodiment may be a member different from the two members (for example, the first link 10 and the first bracket B1) connected by the shaft, or two members. It may be formed integrally with one of the members. Further, the arrangement of the respective axes in the above-described embodiment is only an example, and the positions of the respective axes may be arranged as long as the effects of the present invention can be obtained.

  In the above-described third embodiment, when the normal state is switched to the dive down state, the sixth axis A6 is configured to move forward, but the present invention is not limited to this, and the normal state to the dive down state is performed. Each link may be configured such that the sixth axis A6 moves backward when switching to.

  In the second to fifth embodiments described above, the first latch device S21 may not be provided. This is because in these forms, the state of the vehicle seat S can be maintained in a normal state by locking the movement of each link by each regulation switching mechanism 70, 80, 100, 200.

  In the above-described embodiment, the present invention is applied to the vehicle seat S used as the second-row seat of the three-row seat, but the present invention is not limited to this and is used, for example, in the passenger seat of a two-door vehicle. The present invention may be applied to a vehicle seat or the like.

  Although the torsion springs 51 and 52 are illustrated as the first urging member and the second urging member in the above-described embodiment, the present invention is not limited to this, and for example, a spiral spring, a leaf spring, or a tension or compression spring. It may be a coil spring or the like. The installation of the first urging member and the second urging member can be arbitrarily determined. For example, the first urging member and the second urging member may not be provided on the vehicle seat, or only the first urging member may be provided on the vehicle seat.

  In the above-described embodiment, the vehicle seat S used in an automobile is exemplified as the vehicle seat, but the present invention is not limited to this, and other vehicle seats, for example, seats used in ships, aircrafts, and the like. Can also be applied to.

  In the above-described embodiment, the leg 12 is provided on the first link 10, but the present invention is not limited to this. For example, the leg is not provided on the first link, and the first link is provided by a member provided on the floor. You may support it.

  The elements described in the above-described embodiments and modifications may be implemented in any combination.

10 1st link 20 2nd link 30 3rd link 40 4th link A1 1st axis A2 2nd axis A3 3rd axis A4 4th axis A5 5th axis F Floor S Vehicle seat S1 Seat cushion S2 Seat back

Claims (13)

The seat cushion and the seat back are in a normal state when an occupant is seated, the seat cushion is arranged closer to the floor than in the normal state, and the seat back is forward with respect to the seat cushion. A dive-down state folded in, and a vehicle seat that can be switched to a hip-up state in which the rear end portion of the seat cushion is located above the front end portion compared to the normal state,
A first link that is rotatable around a first shaft supported on the floor and is supported on the floor;
A second link that is rotatably connected to the first link via a second shaft and that is rotatable around the second shaft together with the seat back when switching the state;
A third link that is rotatably connected to the second link via a third shaft and forms a part of the seat cushion;
A fourth link rotatably connected to the third link via a fourth shaft and rotatable about a fifth shaft supported by the floor;
The vehicle seat, wherein the second axis is a center of rotation of the seat back when the normal state is switched to the dive down state.   The vehicle seat according to claim 1, wherein the third shaft is arranged above the second shaft.   The vehicle seat according to claim 1 or 2, wherein the second shaft, which is the center of rotation of the seat back, is arranged below the seat cushion in the normal state.   The vehicle seat according to any one of claims 1 to 3, wherein, in the dive-down state, the fourth link is located after the front end of the seat cushion.   The vehicle seat according to any one of claims 1 to 4, further comprising a first biasing member that biases the fourth link forward.   The vehicle seat according to claim 1, further comprising a second biasing member that biases the first link forward.   One end of the second link is rotatably connected to one of the second link and the third link, and the second link and the third link are oriented so that the orientations of the second link and the third link with respect to the first link are determined. The vehicle seat according to any one of claims 1 to 6, further comprising: an attitude regulating link that regulates the movement of the third link.   A regulation switching mechanism capable of switching the states of the second link and the third link between a regulation state in which movement is regulated by the posture regulation link and a released state in which regulation by the posture regulation link is released. The vehicle seat according to claim 7, wherein:   The regulation switching mechanism fixes the position of the one end of the posture regulation link with respect to the one link in the regulation state, and fixes the one end of the posture regulation link with respect to the one link in the released state. The vehicle seat according to claim 8, wherein the vehicle seat is movable. The one link has a first part extending from the second shaft to the third shaft, and a second part rotatably connected to the first part,
The regulation switching mechanism regulates rotation of the second portion with respect to the first portion in the regulation state, and releases regulation of rotation of the second portion with respect to the first portion in the release state. The vehicle seat according to claim 8. A sixth shaft for rotatably supporting the other end of the posture regulating link,
The regulation switching mechanism maintains the sixth axis at the first position in the regulation state, and moves the sixth axis from the first position to a second position different from the first position in the released state. The vehicle seat according to claim 8, wherein: A sixth shaft for rotatably supporting the other end of the posture regulating link,
The posture restriction link is provided rotatably around the sixth axis and a first beam section that is rotatably connected to the one link via a seventh axis. And a movable second beam portion,
9. The regulation switching mechanism maintains a constant axial distance from the sixth axis to the seventh axis in the regulated state, and makes the axial distance variable in the released state. The vehicle seat described in.   The vehicle seat according to any one of claims 7 to 12, wherein the other end portion of the posture regulation link is rotatably connected to the floor via a sixth shaft. .

Images