JP2008073214A - Seat device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deterioration of comfortability and operability in reclining and prevent an occupant from feeling discomfort by suppressing the change in an operation force during the reclining in a reclining seat 1 constituted to change the tilt of a seat face by being associated with the turning of a seat back 5. <P>SOLUTION: This seat device includes a tilt mechanism portion 7 vertically moving the front portion of the seat cushion 2 so as to tilt it, and an association mechanism portion 8 transmitting the turning displacement of the seat back 5 in the reclining to the tilt mechanism 7 so as to tilt the seat cushion 2. A link 80 of the association mechanism portion 8 is formed with a long hole 80a for suppressing the transmission of the turning displacement of the seat back 5 to the tilt mechanism portion 7 when the seat back 5 is situated between a reference position and a reclining position. An auxiliary damper 9 is also provided for applying a resisting force to the rotational turning of the seat back 5 which is rearward tilting exceeding the reclining position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat device in which the inclination of a seating surface changes in conjunction with the backward tilting of a seat back, and particularly belongs to the technical field of the structure of a mechanism for such interlocking.

Conventionally, for example, as a seat device for an automobile, when the seat back is tilted backward (reclined) from the reference position corresponding to the seating state of the occupant, the seat cushion is also interlocked to change the tilt of the seat surface. Known (see, for example, Patent Documents 1 and 2). In this case, normally, the rotational displacement of the seat back is mechanically transmitted to the seat cushion, and the tilt of the seat is changed by swinging (tilting, swinging) the front of the occupant's buttocks. I try to prevent the deviation.
JP-A-62-192114 Japanese Patent Laid-Open No. 06-245837

  However, when the seat cushion is made to swing mechanically in conjunction with the reclining of the seat back as in the above-described conventional example, the seat surface tilts sharply when the seat back is tilted backward by a predetermined angle or more. As a result, there is a possibility that the occupant's comfortability may be impaired, and further, there is a problem that the occupant's feet are lifted from the vehicle body floor and cannot be supported, making it difficult to operate the reclining lever or the like.

  On the other hand, when a mechanism for transmitting the rotational displacement of the seat back is devised so that the seat back tilts backward beyond a predetermined angle from the reference position, the rotational displacement is not transmitted to the seat cushion side. Although it is conceivable, in this case, the resistance to the rotation suddenly decreases while the seat back is tilted backward, and there is a possibility that the occupant feels uncomfortable in the operation.

  That is, when the seat back is rotated backward from the reference position to a predetermined angle, a force for swinging the seat cushion is required in conjunction therewith, and the reaction force acts on the seat back side. However, if the seat back is tilted backward beyond the predetermined angle and the seat cushion is not interlocked, the resistance force against the rotation of the seat back is abruptly reduced by the reaction force.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a structure of the interlocking mechanism in the seat device in which the inclination of the seating surface is changed in conjunction with the backward inclination of the seat back. It is intended to prevent the passengers from feeling uncomfortable while improving the comfort and operability during reclining by devising the device.

  In order to achieve the above-mentioned object, the invention according to claim 1 of the present application is characterized in that the seat back is pivotable so as to tilt at least backward from the reference position around the lower end thereof, and the front of the seat cushion. A tilt mechanism part that can move at least up and down, and an interlocking mechanism part that moves the front part of the seat cushion up and down by the tilt mechanism part in conjunction with the rotational displacement of the seat back by the turning mechanism part. On the premise of the seat device provided, the interlocking mechanism portion is provided with at least one link, and when the seat back is tilted rearward beyond a predetermined angle from the reference position, the rotational displacement of the link is not included. A long hole for suppressing transmission to the tilt mechanism portion is formed, and resistance is given to the rotation of the seat back that tilts backward beyond the predetermined angle toward the backward tilt side. It is provided with a drag providing means.

  In the seat device configured as described above, when the seat back is rotated so as to tilt backward from the reference position, the tilt mechanism unit is operated by the interlocking mechanism unit in conjunction with the rotational displacement, whereby the front portion of the seat cushion is moved. Moving up and down, the inclination of the seating surface is changed. This makes it possible to increase the back tilt of the seating surface as the seat back is tilted, as in the conventional case, and to improve the support and holdability, such as preventing the occupant's buttocks from moving forward. Can do.

  In addition, an elongated hole is formed in at least one link of the interlocking mechanism portion, and when the seat back tilts backward beyond a predetermined angle, the rotation displacement is prevented from being transmitted to the tilt mechanism portion. Therefore, the inclination of the seat surface does not become too steep with the rotation of the seat back, and it is possible to prevent deterioration of comfort and operability.

  If the rotation displacement is not transmitted to the seat cushion side during the rotation of the seat back, the reaction force from the seat cushion side also does not act on the seat back side. Although the resistance force is reduced, at this time, the resistance force is applied by the resistance force applying means, so that the resistance force against the backward tilting of the seat back does not suddenly decrease, and the passenger feels uncomfortable with the operation. I don't remember.

  As the structure of the interlocking mechanism portion, for example, a link is supported by a support shaft provided on the fixed side, and at least one of the support portion, the seat back side connecting portion, and the tilt mechanism portion side connecting portion includes a seat back. An elongated hole can be formed so that the operation mode of the link is switched during the rotation (claim 2). By doing so, it is possible to configure that the rotational displacement of the seat back is hardly transmitted to the tilt mechanism part side in any one of the operation modes by utilizing the switching of the operation mode of the link.

  More specifically, a long hole may be formed in at least one connecting portion on the seat back side and the tilt mechanism portion side of the link (Claim 3). When the operation mode is such that the member moves on the back side or the tilt mechanism part side in the direction in which the elongated hole extends, transmission of displacement to the tilt mechanism part is suppressed.

  Alternatively, the link of the interlocking mechanism portion may be on the fixed side (the fixed side with respect to the rotation of the seat back and the tilting operation of the seat cushion, for example, the base frame side movably disposed on the floor, It may be supported by a support shaft provided on the support shaft through a long hole, and one of the rotation around the support shaft and the sliding movement with respect to the support shaft may be performed while the seat back is rotating. It may be configured such that the main operation mode is switched.

  In this way, by utilizing the fact that the operation of the link is restricted by the engagement between the elongated hole and the support shaft on the fixed side, the operation mode of the link can be rotated around the support shaft and slid relative to the support shaft. In any of the operation modes, the rotational displacement of the seat back can be hardly transmitted to the tilt mechanism side.

  For example, when the interlocking mechanism part includes a first link on the seat back side and a second link on the tilt mechanism part side, it is preferable that the first link is connected to the support shaft provided on the fixed side via an elongated hole. When the seat back is rotationally displaced between the reference position and a position tilted backward by a predetermined angle, the main operation is to rotate around the support shaft along with the rotational displacement. When the seat back is tilted backward beyond the predetermined angle, the second link is connected to the seat back side so as to perform an operation mainly based on a sliding movement with respect to the support shaft according to the rotational displacement. The connecting portion on the tilt mechanism portion side is displaced as the first link rotates, and the connecting portion on the tilt mechanism portion side is rotated as the first link slides. By connecting to the first link That (claim 5).

  In this way, first, when the seat back is rotationally displaced between the reference position and the position tilted backward by a predetermined angle, the first link is mainly operated around the support shaft along with the rotational displacement. Accordingly, the second link operates so that the connecting portion on the tilt mechanism portion side is displaced. Thus, the rotational displacement of the seat back is transmitted to the tilt mechanism unit side.

  On the other hand, when the seat back is tilted rearward beyond the predetermined angle, the first link mainly performs a sliding movement with respect to the support shaft along with the rotational displacement, and the second link tilts accordingly. Since it rotates around the coupling part on the mechanism part side, the rotational displacement of the seat back is not transmitted to the tilt mechanism part side.

  Next, in the invention of claim 6 of the present application, the seat back is pivotable so that it can tilt at least rearward from the reference position around the lower end thereof, and the front portion of the seat cushion is at least up and down. A seat device comprising: a movable tilt mechanism section; and an interlock mechanism section that moves a front portion of a seat cushion up and down by the tilt mechanism section in conjunction with a rotational displacement of a seat back by the rotation mechanism section. As a premise, the interlocking mechanism part is provided with at least one link, and when the seat back is tilted backward from a reference position beyond a predetermined angle, the rotational displacement of the link is transferred to the tilt mechanism part. The rotating machine is formed so as to form a long hole for suppressing the transmission and at the same time further rotate the seat back tilted backward beyond the predetermined angle to the rear tilt side. Is provided with a driving means for driving through a part.

  In the seat device having the above-described configuration, as in the first aspect of the invention described above, the inclination of the seat cushion seat surface can be changed in conjunction with the rotation of the seat back toward the rearward tilt side. It can prevent forward displacement and suppresses the transmission of the rotational displacement to the seat cushion side when the seat back tilts backward beyond a predetermined angle so that the seat surface does not become too steep. The comfortability and operability are not deteriorated by such a steep inclination of the seating surface.

  Further, when the seatback is tilted backward at least beyond the predetermined angle, the seatback is driven backward by the driving means via the rotation mechanism, and at that time, the resistance against the rotation of the seatback. Even if it suddenly decreases, the occupant is not aware of this, and the operation does not feel strange.

  The invention as described above is particularly effective in a seat device provided with an occupant's footrest (ottoman) at the front portion of the seat cushion. In other words, a passenger who sits on a reclining seat equipped with an ottoman, deposits the upper body in the seat back, and puts the legs on the ottoman, feels that the feet are lifted off the vehicle floor, and the reclining lever, etc. Therefore, the operation of the invention that can prevent the deterioration of the comfortability and operability as described above becomes particularly effective in such a case.

  As described above, according to the seat device according to the present invention, the rotational displacement of the seat back is transmitted to the tilt mechanism portion by the interlocking mechanism portion, and the inclination of the seat cushion seat surface is changed, as in the conventional case. The back tilt of the seating surface can be strengthened with the back tilt of the seat back, thereby improving the supportability and holdability of the occupant's buttocks.

  In addition, with a very simple configuration in which a long hole is provided in the link of the interlocking mechanism portion, when the seat back is tilted rearward from the reference position to a certain extent, the seat cushion is prevented from swinging and the seat surface is suppressed. It is possible to prevent the inclination of the air from becoming too steep, and to prevent deterioration of comfort and operability due to this.

  Further, when the vehicle is tilted rearward to a certain extent, a separate resistance force is applied to the rotation of the seatback further to the rearward tilt side, or the seatback is automatically operated by a driving means rather than manually. By rotating the vehicle at the position, it is possible to prevent the passenger from feeling uncomfortable.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

(Overall configuration of sheet device)
FIG. 1 shows an embodiment in which a seat device according to the present invention is applied to a reclining-type seat 1 arranged on the rear left side of an automobile (in the following description, front and rear and right and left of an automobile are simply referred to as front and rear and right and left). ), A seat cushion 2 on which a passenger is seated is attached to a vehicle body floor via a base frame 3 (see FIG. 2), and an ottoman 4 (footrest) that can be stored in a lower front end of the seat cushion 2 The seat back 5 is disposed so as to extend upward from the vicinity of the rear end of the seat cushion 2, and the headrest 6 is attached to the upper end of the seat back 5.

  In FIG. 2, the cushion structure of the seat cushion 2 is omitted, and its frame structure is shown. Side frames 20 and 20 that are press-formed products of steel plates, for example, are provided on the left and right sides of the seat cushion 2, The front end portion and the rear end portion are connected by pipe members 21 and 22, respectively, and springs 23 and 23 made of a wire are bridged to the left and right at an intermediate portion in the front-rear direction. Further, a plate member 25 that is a frame of the ottoman 4 is attached to the pipe member 21 at the front end portion via arms 24 and 24 so as to be swingable.

  Side frames 30 and 30 of the base frame 3 are disposed in close proximity to the lower outer sides of the left and right cushion side frames 20 and 20, respectively. The base side frames 30 and 30 are also press-molded products, and they are connected to each other by front and rear connecting plates 31 and 31 and a pipe member 32. Although only shown in FIG. 4, sliders 33 and 33 are fixed to the front and rear portions of the lower edge of the base side frame 30, respectively, and can be moved back and forth on slide rails 34 and 34 laid on the vehicle body floor. It is attached.

  Further, an extended portion 30a that is curved and extends upward is formed at the rear end portion of the base side frame 30, and there is a frame 50 (see the figure) of the seat back 5 via a knuckle 35 (rotating mechanism portion). The lower end of (only shows the lower part) is pivotally attached. The seat back frame 50 is, for example, a pipe material formed in an inverted U shape, embedded in a portion near the outer periphery in the seat back 5, and a press-molded bracket at each of the left and right lower ends. 51 and 51 are welded, and the brackets 51 and 51 are connected to each other by a pipe member 52.

  The pipe member 52 is a pivot shaft for the seat back 5, and knuckles 35, 35 are provided between the brackets 51, 51 and the base side frames 30, 30 adjacent to the outside thereof so as to be concentric with the pivot member. It is installed. When the occupant operates the reclining lever 36 (not shown in FIGS. 3 and 4), although not shown in detail, the engagement between the lock member of the knuckle 35 and the cam member is released, and the seat back 5 As described above, a position extending upward from the vicinity of the rear end of the seat cushion 2 (hereinafter referred to as a reference position) can be rotated forward and backward from the position.

(Tilt mechanism)
As shown in FIGS. 3 and 4, the tilt mechanism unit 7 that tilts (swings) the side frame 20 adjacent to the inner side (right side) of the left side frame 20 of the seat cushion 2 and the rotation of the seat back 5. An interlocking mechanism portion 8 that is interlocked with the movement is integrally provided, and the seat back 5 is set at a predetermined angle from a reference position shown in FIG. When rotating to a reclining position (see FIG. 5) tilted backward, the front portion of the seat cushion 2 is raised along with the subsequent tilting to increase the tilt toward the rear side of the seating surface. The predetermined angle can be set in advance as, for example, an inclination angle of the seat back 5 suitable for an occupant sitting on the seat 1 to take a nap.

  First, the tilt mechanism portion 7 will be described. As shown in FIGS. 3 and 4A, a downwardly extending portion 20a is formed at the front portion of the cushion side frame 20, and the extending portion 20a is formed as follows. It is connected to the front portion of the base side frame 30 via the link 70 and the swing lever 71 so that the height can be adjusted. Further, as shown in FIGS. 3 and 4 (b), a downward extending portion 20b is also formed at the rear end portion of the cushion side frame 20, and this extending portion 20b is attached to the base side frame 30. The support pin 37 is rotatably supported around the support pin 37.

  In this way, the cushion side frame 20 rotates around the support pin 37 that supports the lower extension 20b on the rear side, so that the seat cushion 2 moves in the left-right direction so that the front part swings (tilts) up and down. However, even if the front part of the seat cushion 2 swings, the rear end hardly moves (in this example, it extends downward). The front and rear movements of the seat cushion 2 are also smaller than the vertical movement amount of the seat cushion 2.

  More specifically, the lower extension 20a on the front side of the cushion side frame 20 is rotatably connected to the upper end of the link 70 via a pin 72, and the lower end of the link 70 is connected via a pin 73. The swing lever 71 is pivotally connected to one end of the swing lever 71. As shown in FIG. 3, the swing lever 71 is a “<”-shaped flat plate member, and a swing shaft 74 is fixed to the bent portion in a penetrating state. As shown in FIG. 2, the swing shaft 74 extends in the left-right direction, and both end portions thereof are rotatably supported by the base side frames 30 and 30, respectively.

  One side of the swing lever 71 extends substantially forward from the swing shaft 74 and swings up and down as shown in FIG. 5 as well as FIG. 3, and is connected to the end thereof. The linked link 70 is positioned in front of the swing shaft 74, and the point of action of the force from the swing lever 71 to the cushion side frame 20 is positioned in front of that amount. This means that the point of application of the force to the front portion of the seat cushion 2 is far from the rear shaft support portion (support pin 37), and thereby the seat cushion can be operated with a relatively small force. The front part of 2 can be moved up and down.

  As shown in FIG. 3, when the seat back 5 is in the reference position as shown in FIG. 3, one side (hereinafter also referred to as the output side) of the swing lever 71 that operates the cushion side frame 20 via the link 70 as described above. It extends obliquely downward and forward from the swing shaft 74. Therefore, the front part of the cushion side frame 20 connected to the end part on the output side via the link 70 is positioned relatively downward, and at this time, the seating surface of the seat cushion 2 is the seating posture of the occupant It is in the appropriate inclination state set beforehand corresponding to. Hereinafter, at this time, the seat cushion 2 is also in the reference position.

  Further, in this embodiment, a coil spring 75 is disposed between the cushion side frame 20 and the base side frame 30 behind the link 70 and the swing lever 71 so as to extend vertically, The front part of the cushion side frame 20 is always urged downward. This urging force acts downward on the output side of the swing lever 71 via the link 70, and always urges the swing lever 71 to rotate counterclockwise in FIG.

  On the other hand, although not shown, a stopper portion is provided on the inner side of the base side frame 30 so as to engage with the cushion side frame 20 when the seat cushion 2 is at the reference position and to prevent downward movement thereof. ing. For this reason, even if it is urged downward by the tensile force of the coil spring 75 as described above, the front portion of the cushion side frame 20 cannot move below the position corresponding to the reference position of the seat cushion 2. . Therefore, it can be said that the reference position of the seat cushion 2 is the lowest position of its front part.

  As described above, the other side of the rocking lever 71 having a “<” shape extends substantially upward from the rocking shaft 74 in this embodiment. The front end portion of the second interlocking link 81 of the interlocking mechanism portion 8 is rotatably connected, and the rotational displacement of the seat back 5 is transmitted via the interlocking mechanism portion 8 (hereinafter, referred to as “removal displacement”). The other side of the swing lever 71 is also referred to as an input side). As will be described in detail later, when the seat back 5 is tilted backward from the reference position to the reclining position, the swing lever 71 is rotated by the coil spring 75 by pulling the input side backward via the second interlocking link 81. It rotates in the clockwise direction in the figure against the rotation biasing force due to the pulling force.

  When the swing lever 71 rotates in this manner, the output side thereof moves upward and pushes up the front portion of the cushion side frame 20 via the link 70. FIG. 5 shows a state in which the seat back 5 is tilted backward to the reclining position. At this time, the front portion of the seat cushion 2 is at the highest position (uppermost position), and its seating surface tilts relatively rearward. Thus, it is possible to appropriately hold the buttocks of the occupant whose upper body is entrusted to the seatback 5 tilted backward, and to prevent the forward displacement thereof. The position of the seat cushion 2 at this time is hereinafter referred to as a tilt position.

  As described above, in the tilt mechanism unit 7 of this embodiment, the movement of the second interlocking link 81 in the front-rear direction accompanying the rotation of the seat back 5 is efficiently performed by the “<”-shaped swing lever 71. By converting the movement in the vertical direction, the front portion of the seat cushion 2 is moved up and down, and the amount of vertical movement of the front portion of the seat cushion 2 can be sufficiently increased with a compact configuration.

  Further, the end of the swing lever 71 on the input side is positioned above the swing shaft 74 and is pulled rearward by the second interlocking link 81 as the seat back 5 rotates backward. As a result, the input side of the swing lever 71 is displaced rearward, that is, away from the swing shaft 74, so that it is easy to prevent the interference between the two, which also makes the tilt mechanism portion 7 compact. It is preferable in configuring.

(Interlock mechanism)
Next, the interlocking mechanism unit 8 will be described. The interlocking mechanism portion 8 of this embodiment includes first and second interlocking mechanisms that connect the arm member 53 fixed to the bracket 51 of the frame 50 of the seat back 5 to the swing lever 71 of the tilt mechanism portion 7. The first interlocking link 80 includes one end (seat back side end) that is rotatably connected to the arm member 53 via a pin 82. The other end portion 80 (the end portion on the tilt mechanism portion side) 80 is rotatably connected to the rear end portion of the second interlocking link 81 via a pin 83. The front end portion of the second interlocking link 81 is rotatably connected to the input side end portion of the swing lever 71 of the tilt mechanism portion 7 via the pin 76 as described above.

-Long hole of the first interlocking link-
In this embodiment, the first interlocking link 80 is formed with an elongated hole 80a in the axial direction thereof, and the elongated hole 80a is rotatable and slidable with the support pin 38 attached to the base side frame 30. Engagement possible. For this reason, the first interlocking link 80 has an end portion (pin 82) between the elongated hole 80 a and the support pin 38 when the seatback 5 rotates around the rotation support shaft 52. The operation is restricted so that the engaged state is maintained, and as a result, the first interlocking link 80 is either rotated around the support pin 38 or slid along the support pin 38. The operation mode is switched so as to become the subject.

  More specifically, referring to FIGS. 3, 5, and 6, for example, when the seat back 5 rotates between the reference position (FIG. 3) and the reclining position (FIG. 5), one end of the first interlocking link 80. Since the moving direction (indicated by an arrow a1 in FIG. 3) of the portion (pin 82) is significantly different from the direction in which the elongated hole 80a extends, the first interlocking link 80 mainly operates to rotate around the support pin 38. As a result, the rear end portion of the second interlocking link 81 connected to the other end portion moves substantially in the front-rear direction as indicated by an arrow a2 in FIG. As a result, the entire second interlocking link 81 moves in the front-rear direction.

  On the other hand, when the seat back 5 is further tilted backward beyond the reclining position in FIG. 5, as indicated by an arrow a3 in FIG. 5, the moving direction of one end portion (pin 82) of the first interlocking link 80 is the long hole 80a. Therefore, the first interlocking link 80 moves in the vertical direction by sliding the elongated hole 80a with respect to the support pin 38. As shown in FIG. 6, the support pin 38 is positioned at the lowermost end of the long hole 80 a of the first interlocking link 80 in the full flat position where the seat back 5 is substantially laid down.

  Thus, when the seat back 5 rotates between the reclining position (FIG. 5) and the full flat position (FIG. 6), the other end portion (pin 83) of the first interlocking link 80 is shown by an arrow in FIG. As shown by a4, the second interlocking link 81 connected to the rear end portion of the second interlocking link 81 is rotated around the pin 76 at the front end portion, but is almost in the front and rear direction. Do not move.

  In other words, when the seat back 5 is tilted backward from the reference position, the first interlocking link 80 performs a pivoting operation as the seat back 5 tilts backward until the reclining position, whereby the second interlocking link 81 is moved. The tilt mechanism unit 7 is operated via the movement, and the inclination of the seating surface of the seat cushion 2 changes. On the other hand, when the seat back 5 is tilted backward beyond the reclining position, the first interlocking link 80 mainly operates by sliding up and down, and the tilt mechanism unit 7 does not operate, so that the seat cushion 2 is tilted. Maintained in position.

-Auxiliary damper-
Then, when the seat back 5 exceeds the reclining position and the rotational displacement is not transmitted to the seat cushion 2 side, the reaction force of the tilt of the seat cushion 2 does not act on the seat back 5 side. The resistance against the rotation of the back 5 suddenly decreases, and there is a possibility that the occupant feels uncomfortable with the operation. Particularly in this embodiment, as described above, the front portion of the seat cushion 2 is always urged downward by the tensile force of the coil spring 75, and this urging force also becomes a reaction force of the tilt of the seat cushion 2. If such a reaction force does not act immediately after the reclining position is exceeded while the seat back 5 is tilting backward, the sense of incongruity becomes very large.

  Therefore, in this embodiment, as schematically shown in FIG. 3 and the like, an auxiliary damper 9 (resistance force applying means) is disposed between the bracket 51 of the seat back frame 50 and the base side frame 30, so that the seat When the back 5 tilts backward beyond the reclining position, a resistance force is applied to the subsequent tilt.

  Specifically, for example, a known hydraulic damper may be used as the auxiliary damper 9, and a rectangular connecting portion 91 is provided at the lower end of the casing 90, and the support pin 39 attached to the base side frame 30 is rotated. Connect as possible. On the other hand, an elongated hole 92a is formed in the rod 92 extending upward from the upper end of the casing 90, and the elongated hole 92a is turnable to a support pin 54 attached to the bracket 51 of the seat back frame 50, and Engage in a slidable manner.

  Then, as shown in FIG. 5, when the seat back 5 is in the reclining position, the layout is made so that the support pin 54 is positioned at the lowermost end of the elongated hole 92 a of the damper rod 92. In this way, even if the seat back 5 rotates from the reference position to the reclining position, the rod 92 does not advance and retreat, and the auxiliary damper 9 does not generate a damping force. On the other hand, when the seat back 5 tilts backward beyond the reclining position, the rod 92 is pushed into the casing 90 as the seat back 5 tilts, so that the auxiliary damper 9 generates a damping force. Resistance to tilt.

  In this way, even if the damping force is applied from the auxiliary damper 9 to the rotation of the seat back 5 that tilts backward beyond the reclining position, the seat back 2 is not affected by the reaction force of the tilt of the seat cushion 2. As soon as the resistance force to the rotation of 5 exceeds the reclining position, the resistance does not suddenly decrease, and the passenger does not feel uncomfortable with the operation.

-Long hole of the second interlocking link-
In this embodiment, a long hole 81a is also formed at the front end portion of the second interlocking link 81 connected to the output side of the swing lever 71 as described above, and a connecting pin 76 rotates in the long hole 81a. It is inserted so as to be slidable. As shown in FIG. 3 and the like, the elongated hole 81a extends long in the front-rear direction, so that the front end portion of the second interlocking link 81 can turn to the input-side end portion of the swing lever 71 and is approximately in the front-rear direction. It is slidably connected to.

  Since the connection is made through the long hole 81a, even if the second interlocking link 81 moves back and forth as the seat back 5 rotates as described above, it is transmitted to the swing lever 71. As a result, the tilt mechanism unit 7 may not operate. That is, when the seat back 5 and the seat cushion 2 are at the reference position, the pin 76 is located at the front end of the long hole 81a of the second interlocking link 81 as shown in FIG. Even if the pin moves forward, the pin 76 only slides relatively rearward in the elongated hole 81a formed there, and the pin 76 is not pushed forward from the second interlocking link 81.

  In addition, when the seat cushion 2 is in the reference position, the seat cushion 2 is prevented from moving downward by the stopper portion via the cushion side frame 20, which causes the swing lever 71 to be in FIG. Is prevented from rotating counterclockwise. Therefore, when the seat back 5 rotates between the reference position (FIG. 3) and the position tilted forward (FIG. 7), the first interlocking link 80 rotates accordingly, and the second interlocking link Even if 81 moves back and forth, the operation is not transmitted to the swing lever 71, and the seat cushion 2 remains maintained at the reference position.

  On the other hand, when the seat back 5 is between the reference position (FIG. 3) and the reclining position (FIG. 5), the seat cushion 2 is also between the reference position and the tilt position. The tensile force of the coil spring 75 that acts on the swing lever 71 via the link 70 is urged to rotate counterclockwise in FIG. For this reason, when the seat back 5 returns from the reclining position to the reference position, the pin 76 moves forward so as not to leave the front end of the long hole 81a as the second interlocking link 81 moves forward. Accordingly, the swing lever 71 rotates.

  On the other hand, when the seat back 5 tilts rearward toward the reclining position, the second interlocking link 81 moves rearward while pulling the pin 76 engaged with the elongated hole 81a at the front end portion thereof, and thus the swinging movement is performed. The moving lever 71 turns clockwise in FIG. 3 or the like against the turning urging force due to the tensile force of the coil spring 75.

  In other words, in this embodiment, when the seat back 5 tilts forward from the reference position, the connecting portion on the tilt mechanism portion 7 side of the second interlocking link 81 so that the rotational displacement is not transmitted to the tilt mechanism portion 7. If the seat back 5 returns to the reference position from the reclining position, it is difficult to transmit the rotational displacement, but the front portion of the seat cushion 2 is connected to the coil spring. It is configured so that it itself returns to the reference position by constantly urging downward by the tensile force of 75, and as a result, the rotational displacement of the seat back 5 returning from the reclining position is applied to the tilt mechanism unit 7. Will be communicated.

(Sheet operation)
Next, the operation of the seat 1 according to this embodiment will be described in order with reference to FIGS. 3 and 5 to 7. First, when the seat back 5 tilts backward from the reference position shown in FIG. As the lower end arm member 53 rotates about the rotation support shaft 52 in the clockwise direction in the figure, the first interlocking link 80 rotates counterclockwise around the support pin 38 and the second interlocking is performed. The link 81 moves rearward and pulls the input side of the swing lever 71 rearward. As a result, the swing lever 71 is rotated clockwise as shown in FIG. 3 and the like, and the front portion of the cushion side frame 20 is pushed up via the link 70, thereby resisting the tensile force of the coil spring 75. The front rises.

  In this way, the front part of the seat cushion 2 rises as the seat back 5 tilts backward, and the rear tilt of the seat surface gradually increases, so that the butt of the occupant is appropriately adjusted according to the degree of rear tilt of the seat back 5 Will be able to hold. Then, as shown in FIG. 5, when the seat back 5 is in the reclining position and the occupant tilts the upper body in the seat back 5 to make it easy to take a nap, the seat cushion 2 is compared with the seating surface in the tilt position. It will be in the state where it inclined tightly, and it can prevent front shift of a crew member's buttocks.

  Thus, even when the front portion of the seat cushion 2 is raised to the uppermost position so that the seat surface is inclined relatively tightly, the rear end of the seat cushion 2 is hardly moved (in this example, slightly, Rather, it moves backward), and since there is no large gap between the lower end of the reclining seat back 5 as described above, the occupant's buttocks are sandwiched in such a gap and the comfortability is impaired. There is no fear.

  When the seat back 5 further tilts backward, the first interlocking link 80 now slides in the elongated hole 80a with respect to the support pin 38 and moves generally upward, whereby the second interlocking link 81 is moved. It rotates around its front end (pin 76) counterclockwise (upward) in the figure, and hardly moves back and forth. Thus, the swing lever 71 does not swing until the seat back 5 reaches the full flat position (FIG. 6), and the seat cushion 2 is maintained in the tilt position.

  Thus, when the seat back 5 tilts backward beyond the reclining position, the rotational displacement is not transmitted to the tilt mechanism unit 7, and the seat cushion 2 is maintained at the tilt position. Even if the vehicle is tilted rearward, the seat surface will not be tilted excessively, so that the occupant's comfortability will not deteriorate and the operation of the reclining lever, etc. will not be difficult.

  Further, if the rotational displacement of the seat back 5 is not transmitted to the tilt mechanism section 7, the reaction force from the tilt mechanism section 7 will not act on the seat back side. At this time, the auxiliary damper 9 exerts a damping force. This occurs and resistance is applied to the rearward tilt of the seat back 5, so that the resistance against the rearward tilt of the seat back 5 does not rapidly decrease and the passenger does not feel uncomfortable.

  When the seat back 5 tilted backward beyond the reclining position returns to the reference position as described above, even if the seat back 5 is rotated to the reclining position in the same manner as described above, the second interlocking link 81 has its front end portion. The swing lever 71 does not swing only by rotating around the (pin 76). On the other hand, from the reclining position to the reference position, when the first interlocking link 80 rotates around the support pin 38 clockwise as shown in FIG. It moves forward, and the swing lever 71 is rotated counterclockwise in the figure by the rotation biasing force due to the tensile force of the coil spring 75.

  Therefore, as the seat back 5 gradually rises from the reclining position toward the reference position, the front portion of the seat cushion 2 gradually moves downward due to the tensile force of the coil spring 75, and the inclination of the seat surface gradually increases. It becomes loose. As a result, the seat surface of the seat cushion 2 is in an appropriate inclined state corresponding to the degree of rearward inclination of the seatback 5 as in the case of the rearward inclination described above.

  Thus, when the seat back 5 that has returned to the reference position is further rotated forward, the first interlocking link 80 moves along the rotation of the support pin 38 in accordance with the rotation as in the case of returning from the reclining position as described above. The second interlocking link 81 is moved forward by this, but at this time, the seat cushion 2 is already in the reference position, and the front part thereof cannot move any further downward, so that it swings. The lever 71 does not rotate, and the input side pin 76 slides relatively rearward along the elongated hole 81a at the front end of the second interlocking link 81.

  That is, the rotational displacement of the seat back 5 is absorbed by the elongated hole 81 a of the second interlocking link 81 in the interlocking mechanism portion 8 and is not transmitted to the tilt mechanism portion 7. On the contrary, when the seat back 5 rotates from the forward tilt position to the reference position, the rotational displacement is absorbed by the elongated hole 81a of the second interlocking link 81 in the same manner as described above, and the Is not transmitted.

-Effect of the embodiment-
Therefore, when the seat 1 according to this embodiment is mounted on an automobile, the seat cushion 2 is tilted in conjunction with the rotation of the reclining seat back 5, and the inclination of the seating surface is appropriately set with respect to the inclination of the seat back 5. It is possible to maintain a comfortable state, and there is no large gap between the seat cushion 2 and the seat back 5 that are tilted in this manner, and the comfort is very high.

  In addition, when the seat back 5 is tilted backward from the reference position by a predetermined amount or more, the seat cushion 2 is maintained at the tilt position by suppressing the transmission of the rotational displacement, so that the seat surface does not become too tight. Thus, it is possible to prevent deterioration of comfort and operability with a simple and compact configuration.

  In such a case, the auxiliary damper 9 generates a damping force in response to the fact that the seat cushion 2 does not tilt in the middle of tilting the seat back 5 and the reaction force does not act on the seat back 5 side. As a result, the resistance against the rotation of the seat back 5 does not rapidly decrease during the reclining, and the passenger does not feel uncomfortable.

  Further, even if the seat back 5 is tilted forward from the reference position due to the impact in the event of an accident, the seat cushion 2 is maintained at the reference position, and the seat surface does not become too loose. There is no worry of slipping through between the seat belt and the so-called submarine phenomenon is unlikely to occur.

  In addition, when the ottoman 4 is installed at the front end portion of the seat cushion 2 as in this embodiment, the height of the front portion of the seat cushion 2 can be increased even if the seat back 5 rotates so as to tilt forward from the reference position. The fact that the height does not change (or does not drop greatly) means that the lower end of the stored ottoman 4 does not hit the vehicle floor, or the storage position is set unnecessarily high. In other words, it is not necessary to provide a depression or the like, which is preferable in securing a high degree of freedom in design.

(Other embodiments)
The configuration of the seat device according to the present invention is not limited to the above-described embodiment, and includes other various configurations. That is, in the seat 1 of the embodiment, the elongated hole 80a of the first interlocking link 80 is engaged with the support pin 38 on the base side frame 30 side. This is because the seat 1 has the slider 33 and the slide rail 34. This is because the support pin 38 may be disposed on the vehicle body floor, the pillar, or the like. In other words, the support pin 38 rotates the seat back 5. Or on the non-moving side (fixed side) with respect to the tilting operation of the seat cushion 2.

  Further, the seat 1 of the above embodiment is a so-called manual type in which the occupant reclines the seat back 5 with his / her own force, and therefore assists so that the resistance force against the operation does not rapidly decrease during the reclining. Although the damper 9 is provided, it is not restricted to this, For example, you may provide an auxiliary spring.

  Alternatively, for example, as shown in FIG. 8, for example, the width of the long hole 80a of the first interlocking link 80 is made different between the seat back 5 side and the tilt mechanism part 7 side, and the support pin is engaged with the long hole 80a. A rubber ring 40 is externally fitted to 38, and the resistance force that the support pin 38 receives when the support pin 38 slides relatively in the elongated hole 80a can be configured to change during the reclining of the seat back 5. it can.

  In the illustrated example, the width of the long hole 80a is relatively wide on the seat back 5 side, and the resistance force received when the support pin 38 slides there is small, while the long hole having a relatively narrow width is provided. When sliding on the tilt mechanism 7 side of 80a, the rubber ring 40 is compressed, and a relatively large resistance force is generated. Since the boundary between the two is set corresponding to the reclining position of the seat back 5, if the reclining position is exceeded when the seat back 5 tilts backward from the reference position, a large resistance force against the rotational displacement is obtained. Will be granted. In this example, the deformed elongated hole 80a and the rubber ring 40 constitute a resistance applying means.

-Example of power sheet-
The present invention can also be applied to a so-called power seat in which the seat back 5 is automatically rotated by a driving force such as an electric motor. That is, as shown in FIGS. 9 and 10, instead of the rotation support shaft 52 that connects the brackets 51, 51 of the seat back frame 50, the support shaft portion 54 extends inwardly from the base side frame 30. Thus, the bracket 51 is rotatably supported. A gear 41 is fixed to the inner end of the support shaft portion 54, and a gear 42 meshing with the gear 41 is rotatably attached to the bracket 51. A worm gear 43 (worm 43a, worm wheel 43b) is attached so as to rotate integrally with the gear 42, and is driven by an electric motor 44.

  In this way, when the electric motor 44 rotates, the worm 43a fixed to the rotating shaft rotates, and when the worm wheel 43b is rotated by this, the gear 42 rotating (spinning) together with the worm wheel 43b is fixed to the fixed gear 41. By revolving around the seat back frame 50, the seat back frame 50 is rotated around the support shaft portion 54, whereby the seat back 5 is rotated. If the seat back 5 is reclined by the driving force of the electric motor 44 in this way, even if the resistance force against the operation suddenly decreases during the reclining, the occupant does not notice that, so the operation feels strange. There is nothing.

  The electric motor 44 constitutes a driving means for driving the seat back 5 via the rotation mechanism unit 8. The electric motor 44 has a reclining position where the seat back 5 is largely inclined backward and a full flat. It may be driven only between positions. Further, when the drive by the electric motor 44 is stopped, for example, a fixed holding member (not shown) that meshes with the gears 41, 42, etc. and prevents the rotation of the seat back 5 to fix the rotational position. May be provided.

-An example of a linked link-
Furthermore, the structure of the tilt mechanism unit 7 and the interlocking mechanism unit 8 in the above embodiment is merely an example, and does not limit the configuration of the present invention. For example, as shown in FIGS. 11 to 15, the interlocking mechanism unit 8 can be configured by a single interlocking link 85. The configuration of the seat 1 in the illustrated example is substantially the same as that of the above-described embodiment except for the structure of the tilt mechanism unit 7, the interlocking mechanism unit 8, and the arm member 55 described below. Are denoted by the same reference numerals, and the description thereof is omitted.

  Referring to FIG. 11, in this example, the swing lever 77 of the tilt mechanism unit 7 is not shaped like “<” as in the above-described embodiment, and the swing shaft 74 is fixed to one end (the upper end in the figure). The end (the lower end in the figure) is constituted by a link serving as both an input side and an output side. Further, the link 70 connected to the swing lever 77 by the pin 73 has a longer axial length than that of the above-described embodiment. Further, the front end portion of the interlocking link 85 is connected to the pin 73 that connects the two through a slot 85a so as to be rotatable and slidable.

  The interlocking link 85 is shaped like a letter “h” that is long in the front-rear direction so that the first and second interlocking links 80, 81 in the embodiment are integrated, and a bent portion on the rear end side of the base side frame 30. The arm member 55 on the seat back 5 side is rotatably connected to the upper end portion of the upper extension portion 30a via a pin 86. The arm member 55 is rotated integrally with the seat back 5 and transmits the rotational displacement to the interlocking mechanism portion 8 as in the above embodiment (arm member 53). In addition, a long hole 55a is formed as shown in the figure, and a pin 86 attached to the rear end portion of the interlocking link 85 is rotatably and slidably engaged with the long hole 55a. Yes.

  When the seat back 5 tilts backward (reclining) from the reference position shown in FIG. 11 to the reclining position shown in FIG. 12, the connecting portion (pin 86) with the arm member 55 rotates as the seat back 5 rotates. By rotating clockwise around the moving support shaft 52 in the figure, the interlocking link 85 moves forward, so that the lower end of the swing lever 77 rotates around the swing shaft 74 in the clockwise direction in the figure. While moving, the front part of the cushion side frame 20 is pushed up via the link 70, and the seat cushion 2 is positioned at the tilt position where the front part is the uppermost position.

  Next, when the seat back 5 further tilts beyond the reclining position (FIG. 12), the pin 86 at the rear end of the interlocking link 85 slides along the elongated hole 55a of the arm member 55, and the seat back 5, even if the arm member 55 rotates around the rotation support shaft 52, the interlocking link 85 only rotates around its front end (pin 73), and the swing lever 77 and link 70 are not operated. Therefore, the seat cushion 2 is maintained in the tilt position until the seat back 5 reaches the full flat position shown in FIG.

  On the other hand, when the seat back 5 tilts forward from the reference position (FIG. 11), the arm member 55 rotates around the rotation support shaft 52 in the clockwise direction in the drawing as it rotates, and a connecting portion with this. As the (pin 86) moves rearward and obliquely upward, the interlocking link 85 moves backward including its front end. However, in the long hole 85a at the front end portion of the interlocking link 85 that moves backward in this manner, the pin 73 slides relatively to the front side, and the pin 73 is not pulled to the rear side. Therefore, the swing lever 77 and the link 70 do not operate. For this reason, the seat cushion 2 is maintained at the reference position as shown in FIG.

  Then, when the seat back 5 is further rotated forward from a state where it is inclined forward by a predetermined angle, and the arm member 55 further rotates around the rotation support shaft 52, the rear end of the interlocking link 85 is caused by the pin 86. However, since the pin 73 is already positioned at the front end in the long hole 85a at the front end, the pin is moved in the rear obliquely upward direction of the interlocking link 85. 73 is also raised rearward and obliquely upward, whereby the swing lever 77 rotates around the swing shaft 74 counterclockwise in the figure.

  By the rotation of the swing lever 77, the front portion of the cushion side frame 20 is pulled down via the link 70, and the seat surface of the seat cushion 2 sinks as shown in FIG. Therefore, the seat back 5 can be largely inclined forward until the back surface thereof becomes a substantially horizontal forward lying position without causing interference with the seat cushion 2.

  In this example, as described above, the interlocking link 85 is connected to the arm member 55 on the seat back 5 side and the swing lever 77 on the tilt mechanism unit 7 side through the long holes 55a and 85a, respectively. Thus, while the seat back 5 is rotated 90 ° or more (first set angle) from the reference position (FIG. 11) to the front prone position (FIG. 15), the seat cushion 2 is moved by the tilt mechanism 7. Rotates only about 15 ° (second set angle). That is, since the downward tilt angle is smaller than the reference position of the seat cushion 2, it is not necessary to dispose the tilt angle greatly away from the vehicle body floor, and it can be said that the degree of freedom in layout is high.

  Further, as can be seen from FIGS. 12 and 13 and the like, the interlocking link 85 has the shape of “he”. Therefore, even when the seat back 5 is largely inclined backward, the interlocking link 85 does not protrude upward. The interference with the cushion body of the seat cushion 2 can be easily avoided.

  As described above, the seat device according to the present invention is suitable as a seat for an automobile because the seat cushion can be tilted in conjunction with the reclining of the seat back so that the body of the occupant can always be appropriately retained. is there.

1 is a perspective view illustrating an appearance of an automobile seat according to Embodiment 1. FIG. It is a perspective view showing a frame structure of a seat cushion with the cushion body omitted. It is explanatory drawing which shows the structure of an interlocking mechanism part and a tilt mechanism part seeing from a side. It is explanatory drawing seen from the front, (a) is an a arrow figure of FIG. 3, (b) is the bb sectional drawing. FIG. 4 is a view corresponding to FIG. 3 at the time of reclining. FIG. 4 is a view corresponding to FIG. 3 when fully flat. FIG. 4 is a view corresponding to FIG. 3 when the seat back is tilted forward. FIG. 4 is a view corresponding to FIG. 3 according to another embodiment in which the elongated hole of the link is modified. FIG. 4 is a view corresponding to FIG. 3 according to another embodiment applied to a power seat. FIG. 4B is a diagram corresponding to FIG. It is the FIG. 3 equivalent view which concerns on other embodiment which comprised the interlocking link mechanism by the single link. FIG. 6 is a view corresponding to FIG. FIG. 7 is a view corresponding to FIG. 6. FIG. 8 is a view corresponding to FIG. FIG. 12 is a view corresponding to FIG. 11 when the seat back is retracted.

Explanation of symbols

1 sheet (sheet device)
2 Seat cushion 3 Base frame (fixed side)
38 Support pin (link shaft)
4 Ottoman (footrest)
DESCRIPTION OF SYMBOLS 5 Seat back 7 Tilt mechanism part 70 Link 71 Oscillating lever 74 Oscillating shaft 8 Interlocking mechanism part 80 1st interlocking link 80a Elongate hole 81 2nd interlocking link 81a Elongate hole 85 Interlocking link 85a Elongate hole 9 Auxiliary damper means)
36 knuckle (rotating mechanism)
44 Electric motor (drive means)

Claims (7)

A pivot mechanism that is pivotable so that the seat back tilts at least backward from the reference position around the lower end of the seat back;
A tilt mechanism that can move at least up and down the front part of the seat cushion; and
In a seat device comprising: an interlocking mechanism part that moves the front part of a seat cushion up and down by the tilt mechanism part in conjunction with the rotational displacement of the seat back by the rotation mechanism part;
The interlocking mechanism portion includes at least one link, and when the seat back tilts backward from a reference position beyond a predetermined angle, the rotational displacement is transmitted to the tilt mechanism portion. A long hole to suppress is formed,
A seating device, comprising: a resisting force imparting unit that imparts a resisting force to the backward tilting of the seatback that tilts backward beyond the predetermined angle.   The link is supported by a support shaft provided on the fixed side, and at least one of the support portion, the seat back side connecting portion, and the tilt mechanism portion side connecting portion has a link in the middle of the rotation of the seat back. The sheet apparatus according to claim 1, wherein an elongated hole is formed so that the operation mode is switched.   3. The seat device according to claim 1, wherein an elongated hole is formed in at least one connecting portion on a seat back side and a tilt mechanism portion side of the link.   The link is supported by a support shaft provided on the fixed side through a long hole, and is mainly used from one of the rotation around the support shaft and the sliding movement with respect to the support shaft during the rotation of the seat back. 4. The seat device according to claim 2, wherein the seat device is connected to the seat back side so that the operation mode is switched. The interlocking mechanism unit includes a first link on the seat back side and a second link on the tilt mechanism unit side,
The first link is supported by a support shaft provided on the fixed side through a long hole, and this rotational displacement is performed when the seat back is rotationally displaced between a reference position and a position inclined backward by a predetermined angle. When the seat back is tilted rearward beyond the predetermined angle, the slide movement with respect to the pivot is mainly performed. It is connected to the seat back so that it operates,
The connecting portion on the tilt mechanism portion side of the second link displaces as the first link rotates, while the second link rotates around the connecting portion on the tilt mechanism portion side as the first link slides. The seat device according to claim 4, wherein the seat device is connected to the first link so as to move. A pivot mechanism that is pivotable so that the seat back tilts at least backward from the reference position around the lower end of the seat back;
A tilt mechanism that can move at least up and down the front part of the seat cushion; and
In a seat device comprising: an interlocking mechanism part that moves the front part of a seat cushion up and down by the tilt mechanism part in conjunction with the rotational displacement of the seat back by the rotation mechanism part;
The interlocking mechanism portion includes at least one link, and when the seat back tilts backward from a reference position beyond a predetermined angle, the rotational displacement is transmitted to the tilt mechanism portion. A long hole to suppress is formed,
A seat device comprising: drive means for driving through the turning mechanism so as to further turn the seat back inclined backward beyond the predetermined angle further toward the backward inclined side. The seat device according to any one of claims 1 to 6, further comprising an occupant's footrest at a front portion of the seat cushion.

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