JP2009279960A - Vehicle seat with variable length of seat cushion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle seat with a variable length of a seat cushion capable of largely utilizing a lower part space of the seat cushion without changing the shape of a front edge of the seat cushion. <P>SOLUTION: This vehicle seat has the seat cushion 1 provided with a frame member 10, a cushion body 20 mounted on the frame member 10 and an operation mechanism for operating a front end part of the cushion body 20, and is capable of adjusting the length of the seat cushion 1 to a desired length by operating the front end part of the cushion body 20 by the operation mechanism. The operation mechanism has a sliding member 11 slidable in the longitudinal direction, a link mechanism 30 connected to the sliding member 11 and a frame member 12 and a pressing member 31 connected to the link mechanism 30 to be slidable downward according to longitudinally sliding of the sliding member 11. When the length of the seat cushion is shortened, the front end part of the cushion body 20 is towed and operated downward by the pressing member 31 since the pressing member 31 slides and moves downward by interlocking with the rear side sliding of the sliding member 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle seat having a variable seat cushion length that can adjust the length of the seat cushion to a desired length.

  The vehicle seat preferably has a configuration in which the length of the seat cushion can be freely adjusted in accordance with the body shape of the occupant. By setting the length of the seat cushion to an optimum length according to the occupant's body shape, the load per contact area between the seat cushion and the occupant can be reduced or the vehicle can be operated in a correct posture. Thereby, advantages such as a reduction in the degree of fatigue of the occupant can be obtained. As a vehicle seat in which the length of the seat cushion can be freely adjusted as described above, for example, there is Patent Document 1. A seat cushion that constitutes a vehicle seat of Patent Document 1 includes a frame that forms a skeleton, a pad that is placed on the frame to form a seating surface, and an operation mechanism that operates a front end portion of the pad in a predetermined direction. Is provided. The operation mechanism here has an arm pivotally supported with respect to the frame and a link mechanism for swinging the arm. The front end of the pad of the seat cushion is fixed to the arm, and the arm swings with respect to the frame via the link mechanism, so that the front end of the pad protrudes obliquely upward and forward to the lower diagonal. It swings between the retracted posture and the length of the seat cushion can be adjusted.

JP 2006-130998 A

  In the vehicle seat of Patent Document 1, the length of the seat cushion is adjusted by swinging the front end portion of the pad that defines the front edge of the seat cushion in an oblique front-rear direction. That is, when shortening the length of the seat cushion, the front end of the pad is moved backward by a predetermined amount obliquely. Therefore, in the lower space of the seat cushion, in addition to the space for disposing the arms and the link mechanism, an empty space that allows the tip of the pad to move in the front-rear direction must be secured. In addition, the link mechanism for swinging the arm requires at least a front-rear length corresponding to the amount of front-rear movement of the pad tip, resulting in a large size. As a result, the lower space of the seat cushion becomes narrow, and even when other mechanisms and members are desired to be disposed in the lower space of the seat cushion, such as a power seat that electrically operates the seating posture of the vehicle seat. The installation space is limited, and the degree of freedom in design is low. This problem also applies to a vehicle seat in which the front end portion of the pad is slid back and forth to change the length of the seat cushion so that the front end of the pad is pulled backward. That is, another member cannot be arranged in the region where the tip of the pad is pulled backward.

  In Patent Document 1, since the front end of the pad is swung, the front edge shape of the seat cushion changes depending on whether the length of the seat cushion is long or short. That is, when the length of the seat cushion is short, the radius of curvature of the leading edge is relatively small, but when the length of the seat cushion is increased, the radius of curvature of the leading edge is large. In this case, if the length of the seat cushion is increased, the front end of the pad is likely to come into contact with the occupant's legs (especially the calf), which may cause the occupant to feel uncomfortable or take a driving posture that is collapsed to avoid this. There is also. In this case, the original significance of changing the length of the seat cushion may be lost.

  Accordingly, the present invention solves the above-described problems, and the object of the present invention is to provide a vehicle having a variable seat cushion length that can largely utilize the lower space of the seat cushion and that does not change the front edge shape of the seat cushion. Provide seats.

  A seat for a vehicle having a variable seat cushion length according to the present invention includes a frame member that forms a skeleton, a cushion body that is placed on the frame member to form a seating surface, and a front end portion of the cushion body is operated in a predetermined direction. The seat cushion includes an operation mechanism, and the length of the seat cushion can be adjusted to a desired length by operating the front end portion of the cushion body in a predetermined direction by the operation mechanism. The operation mechanism includes a slide member that is slidable in the front-rear direction with respect to the frame member while supporting the back surface of the front end portion of the cushion body, a link mechanism that is coupled to the slide member and the frame member, and the link And a pressing member that is connected to the mechanism and is slidable in the vertical direction as the slide member slides back and forth. The length of the seat cushion itself is variable by sliding the slide member back and forth. Therefore, when the length of the seat cushion is shortened, the length of the cushion body whose dimensions do not change becomes excessive with respect to the length of the seat cushion, and the appearance of the cushion body becomes worse as it is. Therefore, when shortening the length of the seat cushion, the pressing member slides downward in conjunction with the rear slide of the sliding member, so that the front end portion of the cushion body is pulled downward by the pressing member. It is characterized by being. Here, in the present invention, the front end portion of the pressing member and the cushion body slides downward and does not swing as in Patent Document 1, so that the tip of the cushion body does not move backward greatly. That is, “downward” in the present invention is a direction that may be slightly inclined but does not move backward at least greatly. Preferably, it is substantially vertically downward.

  At this time, the front end of the cushion body is fixed to the link mechanism in a state where it wraps around the lower side of the pressing member, and the pressing member can be slid downward in front of the front end fixing portion of the cushion body. It is preferable. Thereby, when the said pressing member slides below, the middle part of the said cushion body front-end part will be pressed down by this pressing member. That is, a part of the front end portion of the cushion body is folded in half with the pressing member interposed therebetween.

  Further, it is preferable that the slide member is formed in a shape having a certain curvature and defining a front edge shape of the seat cushion. Accordingly, when the length of the seat cushion is adjusted, the cushion body is pulled by the pressing member so as to follow the surface of the slide member, so that the front edge shape of the seat cushion is always substantially It is held in a fixed shape.

  Furthermore, it is preferable that the slide member is pin-fixed so as to be slidable back and forth with respect to the frame member.

  According to the present invention, when the length of the seat cushion is shortened, the link mechanism is configured so that the front end portion of the cushion body is pulled downward by the pressing member in conjunction with the rear slide of the slide member. . Therefore, the link mechanism does not need to consider the amount of forward and backward movement of the front end portion of the cushion body, and only needs to be able to slide the pressing member downward, so that the link mechanism can be made compact. Moreover, the front end portion of the cushion body is not pulled backward. As a result, the lower space of the seat cushion (the internal space defined by the frame, the cushion body, etc.) can be used greatly, which is advantageous for disposing other mechanisms and members.

  The middle part of the front end of the cushion body is pressed downward by the pressing member, and the cushion body is folded in half with the pressing member interposed therebetween, so that the length of the seat cushion is variable (before and after the front edge of the seat cushion). The downward extension amount of the front end portion of the cushion body can be reduced with respect to the movement amount). For example, as compared with the case where the front end of the cushion body is pulled downward without bending the cushion body, the downward extension amount of the front end portion of the cushion body is ½ or less. Thereby, the variable limit amount of the seat cushion length with respect to the installation height of the seat cushion can be increased. From the opposite viewpoint, the downward extension of the cushion body is small relative to the variable amount of the seat cushion length, so even if the seat cushion is the maximum length, there is a space between the lower end of the cushion body front end and the floor. It is easy to ensure and the effective use range of the lower space of the seat cushion can be expanded.

  When adjusting the length of the seat cushion, if the front edge shape of the seat cushion is always held in a shape having a substantially constant curvature, the front edge shape of the seat cushion with respect to the seating posture (especially the legs) of the occupant ( The angle) can be kept constant, so that problems such as discomfort for the occupant do not occur and it is easy to drive with the correct posture.

  If the slide member is pinned to the frame member, even if the slide member protrudes greatly forward with respect to the frame member by extending the seat cushion length, the slide member is greatly deformed downward by the load from the occupant Is avoided.

(Example)
Hereinafter, embodiments of a vehicle seat with a variable seat cushion length according to the present invention will be described with reference to the drawings as appropriate. However, the present invention is not limited to these embodiments, and various further modifications can be made without departing from the gist of the present invention. Needless to say, it is possible to make changes. FIG. 1 is a perspective view of the seat cushion 1 in a state where the length of the seat cushion 1 is the shortest. FIG. 1 shows only the internal structure of the seat cushion 1. FIG. 2 is a perspective view of the operation mechanism in a state where the length of the seat cushion 1 is the shortest. FIG. 3 is an enlarged side cross-sectional view of a main part of the front edge portion of the seat cushion 1 in a state where the length of the seat cushion 1 is an intermediate length. FIG. 4 is an enlarged side cross-sectional view of a main part of the front edge portion of the seat cushion 1 in a state where the length of the seat cushion 1 is the shortest. FIG. 5 is an enlarged side cross-sectional view of the main part of the front edge portion of the seat cushion 1 in a state where the length of the seat cushion 1 is the longest.

  The vehicle seat includes a seat cushion 1 serving as a seating portion for an occupant and a seat back as a backrest (not shown). As shown in FIG. 1, the seat cushion 1 includes a metal frame 10 that forms the skeleton of the seat cushion 1, and a pad 20 (see FIG. 3) that is placed so as to cover the frame 10 and forms a seating surface. And an operation mechanism for operating the front end portion of the pad 20 in a predetermined direction. The frame 10 corresponds to the frame member of the present invention. The pad 20 is made of a material having a high cushioning property and flexibility, such as urethane foam, and corresponds to the cushion body of the present invention. The frame 10 includes a pair of left and right side frames 10 s and 10 s that are slidably fitted on a pair of left and right lower rails 2, 2 that are fixed to the vehicle floor and extend in the front-rear direction. A reinforcement frame 10r is provided between the side frames 10s and 10s, and a cushion pan 12 is provided between the side frames 10s and 10s at the front portion of the seat cushion 1. Although not clearly shown, upper rails are formed at the lower ends of the left and right side frames 10s and 10s so as to be fitted to the left and right lower rails 2 and 2, respectively. As will be described in detail later, the length of the seat cushion 1 can be adjusted to a desired length by operating the front end portion of the pad 20 in a predetermined direction by an operation mechanism.

  The operating mechanism includes a slide pan 11 that is slidable in the front-rear direction while supporting the back surface of the front end portion of the pad 20, a motor unit 13 that is a driving source for the front-rear slide of the slide pan 11, and a bracket 14 that fixes the motor unit 13. A link mechanism 30 connected to the slide pan 11 and the cushion pan 12, a pressing wire 31 connected to the link mechanism 30 and slidable substantially vertically as the slide pan 11 slides back and forth, and the motor unit 13. And a drive stay 18 that slides the slide pan 11 back and forth in response to the drive force. The slide pan 11 corresponds to the slide member of the present invention, and the pressing wire 31 corresponds to the pressing member of the present invention.

  As shown in FIG. 1 and FIG. 2, the cushion pan 12 is a substantially flat metal plate having a certain rigidity, and an erection part 12a erected over the upper surfaces of the left and right side frames 10s and 10s, It has the support part 12b (refer FIG. 3) extended in the front of the installation part 12a and smaller than the installation part 12a in the left-right width. Further, as well shown in FIG. 2, the cushion pan 12 has a bent portion 12c in which the front end portion of the support portion 12b is bent downward, and further cuts and raises both left and right edges of the lower end portion of the bent portion 12c forward. Link fixing part 12d. The slide pan 11 is also a metal plate member having a certain rigidity, and an upper surface portion 11a overlapping the cushion pan 12 and a front edge portion of the upper surface portion 11a are bent downward with a certain curvature, And a front surface portion 11 b that partitions the front surface of the internal space of the seat cushion 1. In the present embodiment, the front surface portion 11b is bent from the upper surface portion 11a by approximately 90 degrees. In addition, long holes 16 and 16 extending in the front-rear direction are formed on the left and right sides of the upper surface portion 11a of the slide pan 11 so as to penetrate vertically, and two holes are provided through the left and right long holes 16 and 16, respectively. Pins 17 and 17 are fixed to the cushion pan 12. The pins 17 and 17 are slidable in the longitudinal directions 16 and 16 in the front-rear direction, so that the slide pan 11 is slidable in the front-rear direction with respect to the cushion pan 12. On the other hand, since the long holes 16 and 16 cannot be removed from the pins 17 and 17, the slide pan 11 is prevented from being separated upward with respect to the cushion pan 12.

  The bracket 14 is a metal member having a certain rigidity and has a T shape. The bracket 14 is joined to the upper surfaces of the left and right side frames 10s and 10s, and the motor unit 13 is screwed to the left and right intermediate portions. The motor unit 13 has a motor part 13a and a gear box part 13b, and a round bar-shaped drive stay 18 is inserted into the gear box part 13b. A predetermined region of the rear end portion of the drive stay 18 is a screw portion 18a having a screw groove formed on the outer peripheral surface thereof, and the screw groove of the screw portion 18a and the gear in the gear box portion 13b are engaged with each other. Thus, the drive stay 18 slides in the front-rear direction by driving the motor. The front end of the drive stay 18 is integrally joined to the left and right rear surfaces of the slide pan 11 so that the slide pan 11 is pushed and pulled by sliding the drive stay 18 back and forth. It slides back and forth as a unit. The front and rear length of the screw portion 18a is larger than the front and rear length of the long hole 16 formed in the slide pan 11, and a ring-shaped stopper 19 that defines the movement limit of the drive stay 18 is separated and integrated at the front and rear ends. Are joined together. On the other hand, a guide stay 23 for stabilizing the back-and-forth slide movement of the slide pan 11 is also integrally and integrally joined to the left and right rear surfaces of the slide pan 11. The guide stay 23 has the same shape and size as the drive stay 18, but no thread groove is formed. Since the guide stay 23 is inserted through the guide member 24 joined to the lower surface of the bracket 14, the guide stay 23 stably slides in the front-rear direction. Thereby, the front-back slide movement of the slide pan 11 is stabilized.

  The link mechanism 30 is provided on both the left and right sides of the seat cushion 1, and is connected to the link bracket 32 extending from the slide pan 11, the slide pan 11, and the cushion pan 12 as shown in FIGS. 2 and 3. A link 33, a slide base 34 attached to the link bracket 32 so as to be vertically slidable, and a pressing wire 31 that moves up and down integrally with the slide base 34. The link bracket 32 is formed integrally with the slide pan 11 by bending the lower left and right ends of the front portion 11b of the slide pan 11 rearward, and has a vertically long elongated hole 36 extending in the vertical direction. Yes. The long hole 36 is slightly inclined but extends in a substantially vertical direction. The link 33 is formed in an L shape. One end (upper end) of the link 33 is connected to the link fixing portion 12d of the cushion pan 12 by a shaft pin 37 so as to be rotatable in the front-rear direction. Note that the insertion hole 38 of the shaft pin 37 formed in the link 33 is formed in a long hole shape so as to allow a relative change accompanying the link rotation. On the other hand, the other end (lower end) of the link 33 is connected to a slide pin 39 fitted to the elongated hole 36 of the link bracket 32 so as to be vertically slidable so as to be rotatable in the front-rear direction. That is, the shaft pin 37 becomes the rotation base end of the link 33, and the slide pin 39 becomes the rotation front end of the link 33. The insertion hole 42 of the shaft pin 37 formed in the link 33 is also formed in a long hole shape so as to allow a relative change accompanying the link rotation (see broken lines in FIGS. 3 to 5). Further, the corner portion of the link 33 is pivotally supported by an operation pin 40 on a protrusion 32 a that integrally protrudes rearward from the upper and lower intermediate portions of the link bracket 32. The link 33 is connected in a state sandwiched between the link fixing part 12d of the cushion pan 12 and the link bracket 32 from the left-right direction, and the link fixing part 12d side is longer than the link bracket 32 side. .

  The slide base material 34 is also fixed to a slide pin 39 fitted in the long hole 36 of the link bracket 32. The pressing wire 31 is fixed to the outer surface of the slide base material 34 by welding. The pressing wire 31 is made of a steel wire with high rigidity. Further, the pressing wire 31 is stretched over the left and right link mechanisms 30 and 30 so as to be along the lower edge of the front surface portion 11d of the slide pan 11, and the link bracket 32 is connected to the slide bracket 34 from the joint portion. It is provided so as to protrude downward at substantially the same amount as the vertical height dimension at an angle substantially parallel to the long hole 36. A flange 32b that protrudes horizontally outward is provided at the lower edge of the link bracket 32. The pressing wire 31 is accommodated in a notch 41 that is notched at a position near the front of the flange 32b. ing. Thereby, the pressing wire 31 moves up and down stably.

  As well shown in FIG. 3, the pad 20 is sized to cover the entire top surface of the frame 10 and is formed to be longer than the front-rear length of the frame 10, and the outer surface thereof is covered with the skin 21. . The pad 20 is fixed in a fixed manner on the upper surface of the cushion pan 12 of the frame 10, and the front end portion overlapping the slide pan 11 is flexible. That is, the front end portion of the flexible pad 20 is supported by the slide pan 11 from the back surface thereof. The slide pan 11 is shaped with a constant curvature. Thereby, the front edge shape of the seat cushion 1 is defined by the slide pan 11. In addition, the tip of the pad 20 is fixed to the lower surface of the link bracket 32 of the link mechanism 30 in a state where the tip of the pad 20 wraps around the lower side of the pressing wire 31 from the front side to the rear side. It is possible to slide up and down in front of the tip fixing portion of the pad 20.

  Next, the effect | action at the time of adjusting the length of the seat cushion 1 is demonstrated. FIG. 3 illustrates a state in which the length of the seat cushion 1 is an intermediate length. At this time, the shaft pin 37 fixed to the link fixing portion 12 d is at the lower end of the insertion hole 38 of the link 33, and the slide pin 39 fitted into the long hole 36 of the link bracket 32 is located between the upper and lower sides of the long hole 36. In position. The link 33 is standing up and down. When the length of the seat cushion 1 is shortened from the state shown in FIG. 3 in correspondence with a small occupant, for example, by operating a switch (not shown) provided on the side surface of the seat cushion 1 or the like, the motor is operated. Drive in reverse rotation. Then, as shown in FIGS. 1 and 2, the drive stay 18 that meshes with the gear in the gear box portion 13 b of the motor unit 13 is slid rearward. As a result, the slide pan 11 joined to the drive stay 18 slides backward so as to be pulled by the drive stay 18. At the same time, the guide stay 23 also slides backward integrally with the slide pan 11, so that the slide pan 11 can stably slide back. When the pins 17 and 17 that connect the slide pan 11 and the cushion pan 12 come into contact with the front ends of the long holes 16 and 16 formed in the upper surface portion 11a of the slide pan 11, the rear slide of the slide pan 11 is performed. It is prescribed. Even in this state, the stopper 19 provided on the drive stay 18 comes into contact with the motor unit 13 even if a large load is applied to the long holes 16 and 16 and the pins 17 and 17 by continuing to operate the switch. Thus, the rear slide limit of the slide pan 11 is reliably defined.

  In conjunction with the rear slide of the slide pan 11, the pressing wire 31 slides downward substantially vertically, so that the front end portion of the pad 20 is pulled downward substantially vertically by the pressing wire 31. Specifically, as the slide pan 11 moves backward, the link 33 is pushed backward at the connecting portion with the operation pin 40 fixed to the protrusion 32a of the link bracket 32, as well shown in FIG. Thus, it tilts and pivots backward about the shaft pin 37 serving as the pivot base end. Then, the relative distance between the shaft pin 37 serving as the rotation base end and the slide pin 39 changes, so that the slide pin 39 fixed to the lower end of the link 33 becomes substantially vertical along the long hole 36 of the link bracket 32. Slide down. When the seat cushion 1 is the shortest, the shaft pin 37 is at the upper end of the insertion hole 38 and the slide pin 39 is at the lower end of the long hole 36. When the slide pin 39 slides downward, the slide base material 34 fixed to the slide pin 39 also slides integrally in the same direction. As a result, the pressing wire 31 joined to the slide base material 34 also slides downward substantially vertically. Then, the front end portion of the pad 20 is pressed and pulled downward by the pressing wire 31 at the front portion of the tip fixing portion of the pad 20 fixed to the link bracket 32. Accordingly, the length of the seat cushion 1 is shortened while the front end portion of the pad 20 is pulled downward substantially vertically (without retreating backward). At this time, the front end portion of the pad 20 is supported by the slide pan 11 that maintains a constant curvature. Therefore, when the length of the seat cushion 1 is shortened, the front edge shape of the seat cushion 1 is not changed. Absent. Further, as the length of the seat cushion 1 is shortened, the front end portion of the pad 20 is pulled downward in a state of being folded in two with the pressing wire 31 in between, so that the length of the seat cushion 1 is reduced (seat The downward extension amount of the front end portion of the pad 20 is small with respect to the rearward movement amount of the front edge of the cushion 1.

  On the other hand, when the length of the seat cushion 1 is increased from the state shown in FIG. 3 so as to correspond to a large passenger, the motor is driven to rotate forward by operating a switch (not shown), and the drive stay 18 is moved forward. Move the slide. Accordingly, the slide pan 11 is pushed forward by the drive stay 18 while being slid and guided by the guide stay 23. The front slide amount of the slide pan 11 is defined when the pins 17 and 17 are in contact with the rear ends of the long holes 16 and 16. In this case as well, even when a large load is applied to the long holes 16 and 16 and the pins 17 and 17, the front slide limit of the slide pan 11 is reliably defined by the stopper 19 coming into contact with the motor unit 13. The

  In conjunction with the front slide of the slide pan 11, the front end portion of the pad 20 is pulled upward along the slide pan 11. Specifically, as the slide pan 11 moves forward, the link 33 is pulled forward at the connecting portion with the operation pin 40 as shown in FIG. It tilts and rotates forward about 37. In conjunction with this, the slide pin 39 and the slide base material 34 slide upward substantially vertically along the long hole 36. As a result, the pressing wire 31 joined to the slide base 34 is also slid upward substantially vertically, so that the downward pressing force of the front end portion of the pad 20 by the pressing wire 31 is released and gradually released. Accordingly, the length of the seat cushion 1 is increased while the front end portion of the pad 20 is pulled upward in accordance with the front slide of the slide pan 11. When the seat cushion 1 is the longest, the shaft pin 37 is at the upper end of the insertion hole 38, and the slide pin 39 is at the upper end of the long hole 36. Further, the pressing wire 31 is raised to a position where it comes into contact with the lower end of the link bracket 32. Also in this case, since the front end portion of the pad 20 is supported by the slide pan 11 that maintains a constant curvature, the front edge shape of the seat cushion 1 changes when the length of the seat cushion 1 is increased. There is no. Further, since the forward protrusion amount of the slide pan 11 with respect to the cushion pan 12 is large, the slide pan 11 is likely to be deformed downward when a passenger's load is applied in this state. However, since the slide pan 11 is fixed by the pins 17 and 17, deformation due to the load of the occupant is suppressed.

(Modification)
In the said Example, although the long hole 16 and the pin 17 were provided in two right and left places, you may provide only one place or three places or more without limiting to this. As the number of the installation places of the long holes 16 and the pins 17 increases, the deformation of the slide pan 11 can be surely prevented. When providing the long hole 16 and the pin 17 in one place, it is preferable to provide in the left-right center part of the slide pan 11. Moreover, the long hole 16 and the pin 17 are not necessarily required. The longitudinal length of the long hole 16 may be equal to or greater than the longitudinal sliding amount of the slide pan 11. Further, the number of stays 18 and 23 for sliding the slide pan 11 in the front-rear direction is not limited to two, and may be one or three or more.

  The front edge shape of the seat cushion 1 is defined by the slide pan 11, but the bending angle of the front surface portion 11b of the slide pan 11 is not particularly limited, and may be appropriately designed within a range of about 80 to 120 degrees from the upper surface portion 11a. . Preferably, it is about 90 to 100 degrees. If the front surface portion 11b is bent 90 degrees or more from the upper surface portion 11a, the front end portion of the pad 20 is inclined rearward from the upper side to the lower side, so that the front edge of the seat cushion 1 is difficult to contact the occupant's leg. .

  The downward slide (downward pulling of the pad 20) of the pressing wire 31 may be slightly inclined (for example, within ± 15 degrees from the vertical direction) as long as it is in a range that is substantially vertical and does not retreat backward. Preferably, it is within about ± 10 degrees from the vertical direction.

It is a perspective view which shows the internal structure of a seat cushion. It is a perspective view of an operation mechanism. It is a principal part expanded side sectional view of a seat cushion front edge part in the state where the length of a seat cushion is an intermediate length. It is a principal part expanded side sectional view of the seat cushion front edge part in the state where the length of a seat cushion is the shortest. It is a principal part expanded side sectional view of a seat cushion front edge part in the state where the length of a seat cushion is the longest.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat cushion 10 Frame 11 Slide pan 12 Cushion pan 13 Motor unit 16 Long hole 17 Pin 18 Drive stay 18a Screw part 19 Stopper 20 Pad 21 Skin 23 Guide stay 30 Link mechanism 31 Press wire 32 Link bracket 33 Link 34 Slide base material 36 Long hole 37 Shaft pin 39 Slide pin 40 Operation pin

Claims (4)

A front end of the cushion body, the seat body including a frame member, a cushion body that is placed on the frame member to form a seating surface, and an operation mechanism that operates a front end portion of the cushion body in a predetermined direction; A seat cushion length variable vehicle seat capable of adjusting a length of the seat cushion to a desired length by operating a portion in a predetermined direction by the operation mechanism,
The operation mechanism includes a slide member that is slidable in the front-rear direction with respect to the frame member while supporting the back surface of the front end portion of the cushion body, a link mechanism that is coupled to the slide member and the frame member, A pressing member that is connected to a link mechanism and is slidable in the vertical direction along with the front and rear slide of the slide member;
When shortening the length of the seat cushion, the front end of the cushion body is pulled downward by the pressing member as the pressing member slides downward in conjunction with the rear slide of the sliding member. A vehicle seat having a variable seat cushion length. The tip of the cushion body is fixed to the link mechanism in a state of wrapping under the pressing member,
The pressing member is slidable downward in front of the tip fixing portion of the cushion body,
The vehicle seat with variable seat cushion length according to claim 1, wherein when the pressing member slides downward, a midway portion of the front end portion of the cushion body is pressed downward by the pressing member. The slide member is formed in a shape having a certain curvature and defining a front edge shape of the seat cushion,
When the length of the seat cushion is adjusted, the cushion body is pulled by the pressing member so as to follow the surface of the slide member, whereby the front edge shape of the seat cushion is maintained. The vehicle seat according to claim 1 or 2, wherein the seat cushion length is variable. 4. The vehicle seat according to claim 1, wherein the slide member is pin-fixed so as to be slidable back and forth with respect to the frame member. 5.

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