JP4688215B2 - Vehicle seat - Google Patents

Description

  The present invention provides a variable form vehicle in which the back of the seat back can be used as a loading platform continuing to the rear cargo compartment by forcing the seat back forward in a substantially horizontal space in the space vacated by the front cushion being lifted up. More particularly, the present invention relates to a vehicle seat that allows the movement of a seat cushion between a seating position and a front flip-up position to be interlocked with a forward and backward movement of a seat back.

  For example, the back of the seat back (back of the back) can be used as a loading platform that is continuous with the rear luggage compartment by tilting the seat back forward almost horizontally into the space that is vacated by the front cushion being lifted forward. The seat is widely known as a rear seat for a station wagon or a multipurpose vehicle. A configuration disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-82902 is provided as this type of variable form sheet.

  In the above-mentioned Japanese Patent Application Laid-Open No. 2004-82902, a seat back and a seat cushion are connected to each other via a telescopic spring means supported so as to be movable back and forth, and a telescopic spring means associated with the forward tilting of the seat back is provided. A configuration is disclosed in which the seat cushion can be flipped forward around the hinge on the front side under the intervening extrusion.

  With such a configuration, the movement of the seat cushion between the sitting position and the front flip-up position is performed in conjunction with the forward and backward movement of the seat back, so that separate operations on the seat back and the seat cushion are omitted. Therefore, simplification of work at the time of changing the sheet form can be ensured by reducing the number of work steps.

  By the way, in this known interlocking type seat, the seat cushion is flipped forward only under a simple rotation around the hinge on the front side. The turning radius at the rear end of the seat cushion tends to increase. And since the movement locus | trajectory of this seat cushion rear end passes through the proximity | contact position with the seat back which is brought forward, when changing a seat form, possibility of producing interference between a seat back and a seat cushion cannot be denied.

  Further, in the known configuration in which the seat cushion is pushed forward via the linear expansion / contraction spring means, (1) the expansion spring means is not protruded above the seat side part in either the seating form or the loading platform form. That is, at least two points, that is, (2) completing the seat cushion forward flip-up at an early stage of the seat back forward movement operation, are required from the viewpoint of ensuring the quality. And in this well-known structure, these requirements are satisfy | filled by providing the seat cushion side pivotal support point of an expansion-contraction spring means in the back position near a hinge.

However, if the seat cushion side pivot point of the extension spring means is disposed at the rear position close to the hinge, it is necessary to push up and push up the seat cushion via the extension spring means because of the transmission efficiency of the force. Since an operation force is required, the operability is likely to be deteriorated due to an excessive increase in the initial operation force at the time of changing the form with the seat back advanced.
JP 2004-82902 A

  The problem to be solved is that if the seat cushion is simply lifted forward by the front hinge, there is a risk of interference between the seat back and the seat cushion. If it is a simple push-out interlock, its operability tends to deteriorate.

  According to a first aspect of the present invention, there is provided a vehicle seat having an operation link having the floor body side as a drive pivot point and a seat cushion side as a free pivot point, and the floor body side drive pivot point on the front side of the drive link point of the operation link. In addition, the seat cushion is supported by a posture auxiliary link that is arranged so that the free pivot point on the seat cushion side is movable with respect to the seat cushion on the rear side of the free pivot point of the operating link. The individual drive gear support shafts of the gear mechanism that operates in conjunction with the back-and-forth swing of the seat back at the front are respectively defined as the drive pivot points of the operation link and the posture auxiliary link. By rotating the movement synchronously with the swinging back and forth of the seat back, the seat cushion is lifted forward and the seat back is moved forward to complete within a predetermined initial range. The gear mechanism allows the rotation of the posture auxiliary link to be decelerated relative to the rotation of the actuation link, and the movement path of the free pivot point of the posture auxiliary link with respect to the seat cushion is defined as a predetermined seat cushion side guide hole. The movement locus of the seat cushion up to the front flip-up associated with the forward tilting of the seat back is determined to be via the forward movement from the backward tilted posture by lifting the front end. The most important feature.

  Further, according to a second aspect of the present invention, the swinging power of the seat back between the standing position and the forward-turning position can be taken out as a back-and-forth movement by an interlocking arm supported so as to be movable back and forth. The swinging power of the seat back can be converted into the rotation of the sector gear by pivotally supporting and connecting the tip of the gear mechanism to the sector gear of the gear mechanism, and the first drive gear meshed with the sector gear and the first drive A gear mechanism is configured as a combination with the second drive gear to which the power is transmitted through the transmission gear meshed with the gear, and the integral support shaft of the first drive gear is used as the drive pivot of the operating link. In addition to the fulcrum, the integral support shaft of the second drive gear is used as the drive pivot for the posture assist link, and at least one of the transmission gear and the second drive gear is decelerated. With Ya, that was assumed to decelerate to the rotation of the operating link the rotation of the orientation auxiliary link, and its most important features.

  Further, according to a third aspect of the present invention, the movement path of the free pivot point of the posture assisting link with respect to the seat cushion includes an upper and lower portion extending in the vertical direction of the seat cushion, and a linear front and rear portion extending rearward from the upper end of the upper and lower portion. The most important feature is that it is defined by the seat cushion side guide hole as a combination with the above.

  According to a fourth aspect of the present invention, the middle part of the pivot link is pivotally attached to the rear bracket on which the hinge of the seat back is arranged, and the rear end of the interlocking arm is pivotally supported at the lower end of the pivot link. The upper end of the pivot link is pivotally supported with respect to the seat back side guide hole which is a combination of the upper and lower portions extending substantially in the hinge direction and the arc-shaped front and rear portions extending forward from the lower ends of the upper and lower portions, By connecting and moving the upper end of the pivot link in the upper and lower parts along with the swinging back and forth of the seat back, it is possible to secure the completion of the seat cushion forward flip-up operation within the predetermined initial range by tilting the seat back forward The movement of the upper end of the pivot link within the front and rear portions makes it possible to secure a single forward movement of the seat back after completion of the seat cushion forward lifting operation. It is characterized.

Further, according to a fifth aspect of the present invention, one end of the torsion bar is inserted and locked into the drive gear support shaft so as to be integrally rotatable with the drive gear support shaft that is the drive pivot support point of the operation link. The other end extended from the end face of the drive gear support shaft is bent as a bent piece that can be engaged with the engaging pin provided at the adjacent position, thereby folding the engaging pin into the engaging pin. After the engagement of the bent piece, it is possible to ensure torsional rotation of the locking end side with respect to the bent piece side of the torsion bar along with the rotation of the drive gear support shaft, and torsion of the torsion bar due to forward tilting of the seat back By rotating, an urging force corresponding to the amount of torsional rotation is accumulated in this torsion bar, and the urging force accumulated in this torsion bar is used as a restoring assisting force when restoring the position of the seat cushion from the front flip-up position. Te, that was available for grant from the corresponding driving gear support shaft to the actuating link, and its most important features.

  In the vehicle seat according to the first aspect of the present invention, the seat cushion can be moved up in a predetermined initial range when the seat back is moved forward, and the seat cushion is moved up until the seat is moved forward. Since the trajectory passes through the forward movement from the backward tilted posture by lifting the front end portion, it is possible to secure the movement trajectory of the rear end of the seat cushion without being approached to the seatback that is tilted forward. Therefore, this claim 1 has an advantage that interference between the seat back and the seat cushion can be surely prevented when the seat form is changed.

  Further, since the first aspect of the present invention is the seat cushion forward flip-up operation under the synchronous drive of the operation link and the posture assist link by the gear mechanism, even if the operation force with respect to the seat back is not so large, Can be flipped forward. Therefore, there is an advantage that the operability is improved by reducing the operation force.

  Further, according to the first aspect of the present invention, the individual drive gear support shafts of the gear mechanism are respectively defined as the drive pivot points of the operation link and the posture assist link, and the gear mechanism can be interlocked with the swinging back and forth of the seat back. Since connection is sufficient, there is an advantage that simplification of the configuration can be surely achieved.

  According to a second aspect of the present invention, the gear mechanism is embodied as having a sector gear, and at least one of the transmission gear and the second drive gear is used as a reduction gear, thereby rotating the posture assist link. Since the operation link is decelerated with respect to the rotation of the operation link, there is an advantage that the synchronization interlock of the operation link and the posture assist link can be secured without complicating the configuration.

  Further, according to a third aspect of the present invention, the movement path of the free pivot point of the posture assisting link with respect to the seat cushion includes an upper and lower portion extending in the vertical direction of the seat cushion, and a linear front and rear portion extending rearward from the upper end of the upper and lower portion. Therefore, there is an advantage that the movement posture of the seat cushion can be clearly defined in spite of a simple configuration.

  According to a fourth aspect of the present invention, the combination of the turning arm and the shape of the seat back side guide hole allows the seat back to be moved forward and the seat cushion to be flipped forward within a predetermined initial range, and the front of the seat cushion to be moved forward. Since it is possible to secure the single back-up of the seat back after the completion of the flip-up operation, there is an advantage that the division of the operation can be easily ensured without complicating the configuration.

  Further, according to the fifth aspect of the present invention, the torsion bar disposed on the drive gear support shaft serving as the floor side pivot point of the operating link is used as the restoring assisting force at the time of restoring the position of the seat cushion. There is an advantage that the restoring assisting force at the time of restoring the position of the seat cushion from the position can be applied without complicating the configuration.

  The prevention of interference between the seat back and the seat cushion and the reduction of the operation force when changing the seat configuration can be realized without complicating the configuration.

  1 and 2 are schematic side views of the vehicle seat 10 of the present invention in a seating configuration and a loading platform configuration. As can be seen from these drawings, the vehicle seat 10 is located in front of the seat cushion 12. It is a so-called variable form type that allows the back 14a of the seat back to be used as a loading platform that is continuous with the rear luggage compartment, by forcing the seat back 14 forward in a space that has been vacated by flipping up. In the present invention, the vehicle seat is embodied as a so-called interlocking form variable seat that interlocks the forward raising of the seat cushion with the forward operation of the seat back.

  In the present invention, the actuating link 16 having the floor side as the drive pivot point 16a and the seat cushion side as the free pivot point 16b, and the floor side drive pivot point 18a are arranged on the front side of the actuating link drive pivot point, The seat cushion is movably supported by a posture auxiliary link 18 in which the free pivot point 18b on the seat cushion side is arranged to be movable with respect to the seat cushion 12 on the rear side of the free pivot point of the operating link.

  The operation link 16 and the posture auxiliary link 18 are operated in synchronization with the swinging back and forth of the seat back 14. In the present invention, the synchronous linkage of the operation link 16 and the posture auxiliary link 18 with respect to the back-and-forth swing of the seat back 14 is obtained by the gear mechanism 22 having the sector gear 20 as shown in FIGS. .

  For example, the back-and-forth swing of the seat back 14 is taken out as a back-and-forth motion of an interlocking arm 24 supported so as to be movable back and forth, and this back-and-forth motion of the interlocking arm is used as a pivot of the front end of the interlocking arm. By converting it into motion, the operation link 16 and the posture auxiliary link 18 can be synchronized with each other via the gear mechanism 22.

  As shown in FIG. 1, the gear mechanism 22 is configured by assembling various gears to a front bracket 28 fixed to a floor body 26 in the vicinity of the front end portion of the seat cushion 12. As can be seen from FIGS. 3 to 5, the gear mechanism 22 includes, for example, a first drive gear 30 meshed with the sector gear 20 and a transmission gear 32 meshed with the first drive gear. The first drive gear has a combination with the second drive gear 34 to which the power is transmitted, and the integral support shaft of the first drive gear serves as the drive pivot point 16a of the operation link and also has the second drive gear. The integral support shaft is defined as a drive pivot point 18a of the posture assist link.

  Here, in the present invention, the rotation of the posture assist link 18 is decelerated by the gear mechanism 22 relative to the rotation of the operation link 16. In this embodiment, at least one of the transmission gear 32 and the second drive gear 34 of the gear mechanism, for example, the second drive gear is used as a reduction gear, so that the attitude assist link rotates relative to the operation link. (Refer to FIG. 1 and FIG. 2).

  By the way, as can be seen from FIGS. 1 and 2, the operation link 16 and the posture assisting link 18 are not parallel links, so that they rotate between the pivot points on the seat cushion side, that is, between the free pivot points 16a and 18a. Trajectory shift occurs. Therefore, in the present invention, by making the free pivot point 18a of the posture assist link movable relative to the seat cushion 12, it is possible to ensure the deviation of the movement locus. In the present invention, the movement path of the free pivot point 18a of the posture assisting link with respect to the seat cushion 12 is limitedly defined by the seat cushion side guide hole 36, so that the up to the front flip-up associated with the forward tilt of the seat back 14 is achieved. The movement trajectory of the seat cushion 12 is embodied as passing through a forward movement from a backward inclined posture by lifting the front end as shown in FIG.

  The movement path of the free pivot point 18a of the posture assist link with respect to the seat cushion 12 is a combination of an upper and lower portion 36a extending in the vertical direction of the seat cushion and a linear front and rear portion 36b extending rearward from the upper end of the upper and lower portion. The seat cushion side guide hole 36 is provided in the seat cushion guide plate 38.

  For example, when the operating link 16 and the posture assisting link 18 are synchronously interlocked due to the forward movement of the interlocking arm 24 accompanying the forward movement of the seat back 14, the posture assisting link is decelerated and rotated relative to the operating link, and the posture assist in the guide hole 36 is achieved. As the free pivot point 18b of the link moves, the seat cushion 12 takes a rearward tilted posture with its front end lifted as shown in FIG.

  Then, if the seat back 14 is further swung forward in the forward direction, the rotation of the posture assisting link 18 with respect to the operating link 16 is reduced and the free pivot point 18b of the posture assisting link in the guide hole 36 is obtained. As a result of the movement, the seat cushion 12 exhibits an overall lifting posture as shown in FIG. 7, and when the seat cushion 12 is further swung forward, the seat cushion is flipped forward in an inverted state as shown in FIG.

  As can be seen from FIG. 8, in the present invention, the seat cushion 12 is flipped forward within the predetermined initial range when the seat back 14 is moved forward. Then, after the seat cushion 12 is flipped forward, the seat back 14 is further moved forward to form the loading platform of the vehicle seat 10 shown in FIG.

  Such an operation of completing the forward raising of the seat cushion 12 within the predetermined initial range when the seat back 14 is moved forward is obtained by the synchronous interlocking of the operation link 16 and the posture auxiliary link 18 by the gear mechanism 22. The predetermined initial range of the seat back can be adjusted and set as appropriate by adjusting the combination of gears and the gear ratio.

  Further, as shown in FIGS. 7 and 8, in the present invention, the seat back 14 can be moved forward independently after the seat back 12 is moved forward and within the predetermined initial range. Then, the single forward tilting of the seat back 14 after completion of the forward raising of the seat cushion 12 is performed, for example, by the rotation link 40 and the seat back side guide hole 42 interposed between the interlocking arm 24 and the seat back 14. It can be secured by the combination.

  An intermediate portion of the pivot link 40 is pivotally attached to a rear bracket 46 on which a hinge 44 of the seat back 14 is arranged, and a rear end of the interlocking arm 24 is pivotally supported and connected to a lower end of the pivot link. . The seat back side guide hole 42 is a combination of an upper and lower portion 42 a provided in the guide plate 48 on the seat back side and extending substantially in the hinge direction, and an arcuate front and rear portion 42 b extending forward from the lower end of the upper and lower portions. On the other hand, the upper end of the pivot link is pivoted and connected via the pivot pin 50, so that the seat back via the pivot link and the interlocking arm are linked.

  As can be seen from FIGS. 1, 6, and 7, the pivot link 40 interlocked with the swinging back and forth of the seat back 14 by the movement of the pivot pin 50 in the upper and lower portions 42 a of the seat back side guide hole. As a result, the interlocking of the interlocking arm 24 is obtained. Then, as shown in FIG. 8, when the pivot pin 50 moves out of the upper and lower portions 42a of the seat back side guide hole and moves to the front and rear portions 42b, the front spring up of the seat cushion 12 is completed. By moving the pivot pin, it is possible to ensure the forward rotation of the rotational link 40, that is, the independent forward tilting of the seat back 14 without the interlocking arm 24 moving back and forth (see FIG. 2).

  As described above, according to the present invention, the seat cushion 12 can be lifted forward within the predetermined initial range when the seat back 14 is moved forward, and the movement path of the seat cushion until the front spring is lifted when the seat back is moved forward. The forward movement from the backward tilted posture by lifting the front end portion is assumed. In other words, since the movement locus of the rear end of the seat cushion that does not accompany the forward-turned seat back 14 can be secured, it is possible to reliably prevent interference between the seat back and the seat cushion 12 when changing the seat configuration.

  In addition, since the seat cushion 12 is flipped forward by the gear mechanism 22 under the synchronous drive of the actuation link 16 and the posture assist link 18, the front of the seat cushion can be operated even if the operation force on the seat back 14 is not so large. Can be flipped up. Therefore, according to the present invention, the operability is reliably improved by reducing the operating force.

  Furthermore, the individual drive gear support shafts of the gear mechanism 22 are respectively defined as the drive pivot support points 16a and 18a of the operation link 16 and the posture auxiliary link 18, and the gear mechanism can be interlocked with the forward / backward swing of the seat back 14. Since it suffices to connect, the present invention can surely simplify the configuration.

  Here, in this embodiment, the seat back 14 and the interlocking arm 24 are connected so as to be interlocked via the rotation link 40, but the swinging back and forth of the seat back can be converted into the longitudinal motion of the interlocking arm. However, the present invention is not limited to this. For example, the interlocking arm may be directly pivotally supported and connected to the seatback side member without using a rotation link.

  However, by interposing the combination of the pivot link 40 and the seat back side guide hole 42 between the seat back 14 and the interlocking arm 24, the single forward movement of the seat back after completion of the forward forward movement of the seat cushion 12 is achieved. Therefore, smooth operation and simplification of the configuration can be surely achieved.

  Further, by providing a combination of the pivot link 40 and the seat back side guide hole 42, the seat back 14 can be pivoted in the seat back side guide hole, for example, within the upper and lower portions 42a when tilting after reclining. Since absorption can be performed under the movement of the pin 50, application to the reclining seat can be easily performed by adopting the configuration as in this embodiment.

  Further, in this embodiment, the seat cushion side guide hole 36 is embodied as a combination of the upper and lower portions 36a and the front and rear portions 36b, but this combination and shape, etc., according to the movement locus required for the seat cushion 12, It can be changed as appropriate.

  In any case, since the movement path of the free pivot point 18b of the posture assisting link with respect to the seat cushion 12 is clarified by the seat cushion side guide hole 36, the required movement path of the seat cushion can be easily secured. The movement trajectory can be limited without complicating the configuration.

  By the way, when the seat is returned from the seat loading platform configuration shown in FIG. 2 to the seating configuration, it is required to restore the position of the seat cushion 12 by the retracting operation of the seat back 14. In this case, the weight of the seat cushion is Since it acts directly as a pulling operation force, there is a risk that the operability will be reduced during the restoration of this form.

  Therefore, in the present invention, a so-called helper spring is used, and the urging force of the helper spring is made to act as a restoring assisting force when the seat cushion is restored from the front flip-up position.

  As shown in FIGS. 9 and 10, in the present invention, a torsion bar 52 is used as the helper spring. Then, the one end 52a of the torsion bar 52 can be integrally rotated with the integral support shaft (drive gear support shaft) 16a of the first drive gear 30 which is the drive pivot point of the operation link 16. The other end 52b extended from the end face of the drive gear spindle is folded as a folding piece that can be engaged with the engagement pin 54 provided at the adjacent position. By forming a bend, it is possible to ensure torsional rotation of the locking end side with respect to the bent piece side of the torsion bar with the rotation of the drive gear support shaft after the bent piece is engaged with the engaging pin. In addition, the present invention is configured.

  As can be seen from FIG. 9, one end 52a of the torsion bar is formed to have a crank part 52c, for example, and a crushing part (not shown) for locking the crank part serves as a drive gear support shaft. By providing at the corresponding portion of 16a, one end of the torsion bar can be locked to the drive gear support shaft.

  Further, as shown in FIGS. 9 and 10, the engagement pin 52 to be engaged with the bent piece 52 b of the torsion bar is, for example, erected on the front bracket 56 on the side where the gear mechanism 22 is not provided. And provided. The urging force from the torsion bar 52 suffices to be applied to the operation link 16 within a predetermined range from the front flip-up position of the seat cushion 12 which is the initial operation range at the time of form restoration. After the seat cushion 12 is moved forward from the seating position to a predetermined position, it is set as a position for receiving the engagement of the bent piece 52b of the torsion bar, for example, after being moved to an upward lifting position as shown in FIG.

In such a configuration, an urging force corresponding to the torsional rotation amount can be accumulated in the torsion bar by the torsional rotation of the torsion bar 52 when the seat back 14 is moved forward. Then, the urging force accumulated in the torsion bar 52 is applied from the drive gear support shaft 16a to the operating link 16 as a restoring assisting force when the seat cushion 12 is restored from the front flip-up position. The necessary operating force at the time of position restoration, that is, the seat back pulling back operating force can be reduced.

  Therefore, according to the present invention, since the operation force at the time of restoring the sheet form can be sufficiently reduced, the operability can be sufficiently improved.

  By using the torsion bar 52, it is possible to reliably prevent the configuration from becoming complicated.

  The above-described embodiments are for explaining the present invention, and are not intended to limit the present invention. All modifications, alterations, etc. within the technical scope of the present invention are included in the present invention. Needless to say.

  The scope of application of the present invention is not limited as long as it is a form-variable vehicle seat that can be changed to a loading platform. That is, the present invention can be applied regardless of a single seat, a bench seat or the like. Further, since it is sufficient to interlock the movement of the seat cushion with the swinging back and forth of the seat back between the standing position and the seating position, the present invention can be applied without questioning whether the reclining adjustment of the seat back is possible.

It is a schematic side view in the seating form of the vehicle seat of the present invention. It is a schematic side view in the loading platform form of a vehicle seat. It is a schematic front view of a gear mechanism. FIG. 2 is a schematic partial plan view of a vehicle seat mainly including a gear mechanism. FIG. 2 is a schematic partial perspective view of a vehicle seat mainly including a gear mechanism. It is a schematic side view of the vehicle seat when the front end of the seat cushion is lifted. It is a schematic side view of a vehicle seat when the seat cushion is entirely lifted. FIG. 3 is a schematic side view of the vehicle seat when the seat cushion is fully flipped forward. FIG. 2 is a schematic partial plan view of a vehicle seat, mainly a torsion bar, with partial breakage. And It is a schematic front view of a torsion bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle seat 12 Seat cushion 14 Seat back 16 Actuation link 18 Posture auxiliary link 22 Gear mechanism 36 Seat cushion side guide hole 40 Rotation link 42 Seat back side guide hole 52 Torsion bar 54 Engagement pin

Claims (5)

The back of the seat back is connected to the rear luggage compartment by linking the front of the seat cushion to the forward of the seat back, and the front of the seat cushion is moved forward almost horizontally in the space that is vacated by the front of the seat cushion. It is a form-variable vehicle seat that can be used as a loading platform.
An actuating link having the floor body side as the driving pivot point and the seat cushion side as the free pivot point; and the floor body side driving pivot point on the front side of the actuating link driving pivot point, and the seat cushion side free pivot point, A posture auxiliary link arranged to be movable relative to the seat cushion on the rear side of the free pivot point of the operating link;
Each drive gear support shaft of the gear mechanism that operates in conjunction with the back and forth swinging of the seat back between the standing position and the forward tilt position is defined as each drive pivot point of the operation link and the posture auxiliary link. By rotating the operation link and the posture auxiliary link in synchronization with the swinging back and forth of the seat back, the seat cushion can be flipped forward and the seat back can be moved forward within a predetermined initial range.
With this gear mechanism, the rotation of the posture auxiliary link is decelerated relative to the rotation of the actuation link, and the movement path of the free pivot point of the posture auxiliary link with respect to the seat cushion is limitedly defined by a predetermined seat cushion side guide hole. By doing so, the seat locus for the seat cushion until the seat is flipped forward when the seatback is moved forward passes through the forward movement from the backward tilted posture by lifting the front end portion. The swinging power of the seat back between the standing position and the forward-tilting position can be taken out as a back-and-forth movement by an interlocking arm supported so as to be movable back and forth, and the tip of the interlocking arm is used as a sector gear of the gear mechanism. By pivoting and connecting, the swinging power of the seat back can be converted into the rotation of this sector gear,
The gear mechanism is configured to have a combination of a first drive gear meshed with the sector gear; and a second drive gear to which power is transmitted via a transmission gear meshed with the first drive gear. The integral support shaft of the first drive gear is used as the drive pivot point of the operating link, and the integral support shaft of the second drive gear is used as the drive pivot point of the posture assisting link. The vehicle seat according to claim 1, wherein at least one of the second drive gears is a reduction gear, whereby the rotation of the posture assist link is decelerated relative to the rotation of the operation link.   A seat as a combination of a movement path of the free pivot point of the posture assisting link with respect to the seat cushion; an upper and lower portion extending in the vertical direction of the seat cushion; and a linear front and rear portion extending rearward from the upper end of the upper and lower portion. The vehicle seat according to claim 1 or 2, defined by a cushion side guide hole. An intermediate portion of the pivot link is pivotally attached to a rear bracket on which the hinge of the seat back is arranged, and a rear end of the interlocking arm is pivotally supported and connected to a lower end of the pivot link.
The upper end of the pivot link is pivotally supported and connected to a seat back side guide hole which is a combination of an upper and lower portion extending substantially in the hinge direction; and an arcuate front and rear portion extending forward from the lower end of the upper and lower portion;
As the seat back swings back and forth, the upper end of the pivot link moves in the upper and lower portions, so that the seat back can be tilted forward and the seat cushion is fully lifted up within a predetermined initial range. 4. The vehicle seat according to claim 2, wherein a single forward tilting of the seat back after the forward raising operation of the seat cushion can be secured by moving the upper end of the pivot link in the front and rear portion. One end of the torsion bar is inserted into and locked in the drive gear support shaft so as to be able to rotate integrally with the drive gear support shaft that is the drive pivot of the operating link, and extends from the end face of the drive gear support shaft. The other end is bent as a bent piece that can be engaged with an engaging pin provided at an adjacent position thereof, so that the bent end is engaged with the engaging pin. With the rotation of the drive gear spindle, it is possible to ensure the torsional rotation on the locking end side with respect to the bent piece side of the torsion bar,
When the torsion bar is twisted and rotated when the seat back is moved forward, an urging force corresponding to the amount of torsional rotation is accumulated in the torsion bar, and the urging force accumulated in the torsion bar is The vehicle seat according to any one of claims 1 to 4, wherein the restoring assisting force at the time of restoring the position of the seat cushion can be applied to the operating link from a corresponding drive gear support shaft.

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