JPH053027U - Vehicle seat structure - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention facilitates the work of fixing the sheet unit at the tumble position, improves the workability of the tumble operation of the sheet unit, and improves the operation of the sheet at the tumble position. To prevent rattling of the control unit and
The main feature is to hold the unit stable. A self-supporting link mechanism 61 for holding a sheet unit at a tumble position is provided, and a lower link 62 and an upper link 63 of this self-supporting link mechanism 61 and a connecting pin 65 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle seat structure having a tumble mechanism for moving a seat unit in which a seat back is tilted substantially in parallel on a seat cushion to a tumble position in which the seat unit is erected substantially upright.

[0002]

[Prior Art]

 In general, a vent sheet type is known as a vehicle seat disposed in a passenger compartment of a vehicle such as an automobile. This bench seat type vehicle seat is mainly located between the front seat and the sad seat in a vehicle in which the seats are arranged in three rows along the front-rear direction of the vehicle body. It is often used as a second seat arranged in the vehicle or as a rear seat in a vehicle in which the seats are arranged in two rows along the longitudinal direction of the vehicle body in the passenger compartment.

By the way, as a bench seat type vehicle seat of this type, a seat unit in which a seat back is tilted substantially in parallel on a seat cushion is moved to a tumble position in which it is erected substantially upright. A tumble mechanism has been developed that is configured to expand the luggage space behind the seat. Further, this tumble mechanism is provided with an appropriate fixing mechanism for fixing the sheet unit at the tumble position by a manual operation of the user.

[0004]

[Problems to be solved by the device]

 In the conventional vehicle seat equipped with the tumble mechanism, the fixing mechanism for fixing the seat unit at the tumble position needs to be manually operated by the user, which makes the work troublesome and the sheet There was a problem that workability was poor when tumble operating the control unit.

The present invention has been made in view of the above circumstances, and the work of fixing the sheet unit in the tumble position can be easily performed, and the workability in the tumble operation of the sheet unit can be improved. A seat structure for a vehicle is provided which can improve the performance of the seat unit and can prevent the seat unit fixed at the tumble position from rattling and stably hold the seat unit at the tumble position. The purpose is to do.

[0006]

[Means for Solving the Problems]

 In this invention, the front end side of the seat cushion is rotatably connected to the vehicle body side through a rotating pin of a front end side connecting mechanism, and the rear end side of the seat cushion is connected through a rear end side connecting mechanism. The seat back is attached to the vehicle body side in a detachable manner, and the seat back is tilted forward from the seat cushion support mechanism attached to the seat cushion side in a substantially parallel state from the normal use state. The rear side of the seat unit, which is rotatably supported up to the folded state and has the seat back tilted substantially parallel to the seat cushion, is rotated by the front end side connecting mechanism of the seat cushion. In a vehicle seat structure including a tumble mechanism that pivots upward about a pin and moves to a tumble position in which it is erected substantially upright, one end of a fixed bracket on the vehicle body side of the front end side coupling mechanism is provided. A lower link rotatably connected, and an upper end rotatably connected to the free end side of the lower link via a connecting pin, and the other end rotatably connected to the seat cushion side. A link is provided, and in a state where the rear end side of the seat cushion is connected to the vehicle body side, the lower link and the upper link are held in a folded state in which the lower link and the upper link are folded around the connecting pin. A self-supporting link mechanism for holding the seat unit at the tumble position by engaging the lower link and the upper link in a state where the unit is moved to the tumble position while extending the lower link and the upper link in a substantially linear shape. Provided at the connecting portion between the lower link and the upper link of the self-sustaining link mechanism and the connecting pin, movement of the both links in the direction between the supporting points is allowed when the sheet unit is rotated. In a state in which a play portion for holding the rotating motions of the both links in a smooth state is provided, the sheet unit is moved to the tumble position, and the lower link and the upper link are engaged with each other. Play preventing means is provided for preventing play in the connecting portion between the lower link and the upper link and the connecting pin.

[0007]

[Action]

 In the above structure, at the non-tumble position where the rear end side of the seat cushion is connected to the vehicle body side, the lower link and the upper link of the self-supporting link mechanism are held in a folded state in which the connecting pin is folded at the center. Then, when the sheet unit is moved to the tumble position, the lower link and the upper link of the self-supporting link mechanism are engaged with each other in a substantially linear shape, and the self-supporting link mechanism causes the seat unit to move. Hold at tumble position. Further, during movement of the sheet unit between the non-tumble position and the tumble position, the lower link of the self-supporting link mechanism and the play portion of the connecting portion between the upper link and the connecting pin move in the direction between the support points of both links. Movement is allowed, the rotational movements of both links are maintained in a smooth state, and the seat unit is moved to the tumble position, and the play prevention means is engaged with the lower link and the upper link. This prevents play in the connecting portion between the lower link and the upper link and the connecting pin.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows an overall appearance of a seat 1 of a bench sheet type which is arranged on the rear side of a passenger compartment of a vehicle such as an automobile. Reference numeral 2 denotes a seat of the seat 1. The cushion 3 is a seat back. The bench seat 1 is arranged, for example, between the front seat and the sad seat in a vehicle in which the seats are arranged in three rows along the front and rear directions of the vehicle body. It is used as a second seat or as a rear seat in a vehicle in which the seats are arranged in two rows along the front-rear direction of the vehicle body in the passenger compartment.

On both sides of the seat back 3 of the seat 1, side backs 4 which can be tilted forward and used as an armrest are arranged as shown in FIG. In this case, the seat 1 can be selectively used, for example, for a three-person seated state and a two-person seated state. In the normal use position where the side backs 4 and 4 on both sides of the seat back body 3a are used integrally with the seat back body, three persons are seated, and the side backs 4 and 4 on both sides of the seat back body 3a are moved forward. In the state where it is made to be used, it is designed so that two people can use it. A pair of left and right headrests 5 are detachably attached to the upper end of the seat back 3 on the main body 3a side.

Further, as shown in FIG. 1, the seat 1 is provided with a seat back support mechanism 6 on the side of the seat cushion 2. The seat back support mechanism 6 is rotatable about a fixed bracket 6a fixed to the seat cushion 2 side and a first hinge portion 7 for reclining adjustment of the seat back 3 on the fixed bracket 6a. And a rotation bracket 6b connected to the. Further, a second hinge portion 8 is attached to the pivot bracket 6b to rotatably support the seat back 3 in a folded state in which the seat back 3 is folded forward substantially parallel to the seat cushion 2.

In addition, the seat 1 has a walk-in operation in which the seat cushion 2 is slid in the front-rear direction of the vehicle body from a normal use position shown in FIG. 13 to a front retracted position shown in FIG. A pair of left and right slide mechanisms 11, 11 are provided. The front end portions of these slide mechanisms 11 are rotatably connected to the vehicle body side lower panel 13 via front end side connecting mechanisms 12 shown in FIG. 13, and the rear end portions of these slide mechanisms 11 are It is detachably connected to a floor panel 13 on the vehicle body side via a rear end side connecting mechanism 14.

As shown in FIG. 3, the slide mechanism 11 has a fixed lower rail 21 having a substantially U-shaped cross section, and a cross sectional shape that slides in the vehicle longitudinal direction along the lower rail 21. A substantially U-shaped movable upper rail 22 is provided. In this case, the lower end of the lower rail 21 on the side of the opening is formed with flange portions 21a, 21a bent outward at a substantially right angle. Further, flange portions 22a, 22a are formed at the end of the upper rail 22 on the side of the opening surface, and are bent inward at a substantially right angle. A large number of steel balls (not shown) are interposed between the flange portions 21a, 21a of the lower rail 21 and the flange portions 22a, 22a of the upper rail 22.

Further, the lower rail 21 includes a first lower bracket 23 having a substantially U-shaped cross section shown in FIG. 4 and a second lower bracket 24 having a substantially L-shaped cross section shown in FIG. Each is welded. In this case, the first lower bracket 23 constitutes a part of the front end side connecting mechanism 12, and the bottom surface portion of the bracket 23 having a U-shaped cross section is welded to the lower surface of the lower rail 21.

Further, a spring receiving member 25 is welded to one side portion of the first lower bracket 23. One end of a spring member 26 that pulls the upper rail 22 toward the front retracted position is attached to the upper end of the spring receiving member 25.

Further, the front end side coupling mechanism 12 is provided with a fixing bracket 28 fixed to the floor panel 13 as shown in FIG. A rotating pin 27 is rotatably connected to the fixed bracket 28. Both ends of the rotating pin 27 are welded to the first lower bracket 23, respectively. The rear rail 21 is capable of flipping up the rear side in the front direction around the pivot pin 27.

Further, as shown in FIG. 6, a third lower bracket 29 forming a part of the rear end side connecting mechanism 14 is fixed to the second lower bracket 24. As shown in FIG. 7, the rear end side connecting mechanism 14 is provided with a substantially U-shaped fixing pin 30 fixed to the floor panel 13.

Further, the plate surface of the third lower bracket 29 is arranged so as to face the second lower bracket 24 at a distance. An inwardly depressed recess is formed in a part of the plate surface of the third lower bracket 29, and this recess is welded to the second lower bracket 24 side.

Further, a recess 31 into which the fixing pin 30 is inserted is formed on the lower surface side of the spaced-apart facing arrangement portions of the second lower bracket 24 and the third lower bracket 29. Further, as shown in FIGS. 7 and 8, the sliding operation between the lower rail 21 and the upper rail 22 is prohibited at the plate surface joint portion of the second lower bracket 24 and the third lower bracket 29. An opening 32 for inserting the lock member 49 is formed.

Further, between the second lower bracket 24 and the third lower bracket 29, the hook 34 releasably engaged with the fixed pin 30 is pivoted about the pivot pin 35 between the disposition facing portions. Installed as possible. A spring receiving pin 36 and an operating pin 39 are provided on the hook 34 so as to project therefrom. In this case, the operation pin 39 is arranged on the base end side of the hook 34, and the spring receiving pin 36 is arranged on the side opposite to the operation pin 39 (on the tip end side of the hook 34) around the pivot pin 35. Has been done.

Further, the third lower bracket 29 is formed with arc-shaped elongated holes 37 and 40 for escaping the contact with the spring receiving pin 36 and the operating pin 39, respectively, and a spring receiving portion 29a is formed. There is. Further, a spring member 38 is installed between the spring receiving pin 36 of the hook 34 and the spring receiving portion 29a of the third lower bracket 29 so as to constantly urge the hook 34 in the engagement direction with the fixing pin 30. .. The hook 34 is held in a state in which it is engaged with the fixing pin 30 as shown in FIG. 7 during a normal time (a non-tumble operation) other than a tumble operation described later.

On the other hand, the upper rail 22 is welded with a first upper bracket 41 having a substantially U-shaped cross section as shown in FIG. Further, as shown in FIG. 6, a second upper bracket 42 and a third upper bracket 43 are fixed to the first upper bracket 41, respectively. A spring receiving portion 43a is formed on one side of the rear end portion of the third upper bracket 43, as shown in FIG. The other end of the spring member 26 is attached to the tip of the spring receiving portion 43a, and the upper rail 22 is held by the spring force of the spring member 26 so as to be constantly pulled in the forward retracted position. There is.

Further, the second upper bracket 42 is provided with a lock release mechanism 33 for moving the hook 34 in the engagement releasing direction with the fixing pin 30. The unlocking mechanism 33 is provided with a rotation operating member 44. The rotating operation member 44 is attached to the second upper bracket 42 so as to be rotatable around a rotating pin 45.

In addition, an operation protrusion 44a for pressing the operation pin 39 of the hook 34 is provided on the rotation operation member 44, and a spring receiving portion 44b and a connecting portion 47 of an operation wire (not shown) are respectively provided. Has been formed. In this case, the spring receiving portion 44b is arranged on the opposite side of the operating protrusion 44a with the rotating pin 45 as the center. The other end of the operation wire, one end of which is connected to the connecting portion 47 of the rotary operation member 44, is connected to, for example, the operation knob of the lock releasing mechanism 33.

Further, the second upper bracket 42 is formed with a spring receiving portion 42a. A return spring 46 of the rotation operating member 44 is provided between the spring receiving portion 42a of the second upper bracket 42 and the spring receiving portion 44b of the rotation operating member 44. The rotating operation member 44 is normally held at the fixed position shown in FIG. 7 by the spring force of the return spring 46 except when the operation knob of the lock release mechanism 33 is operated. Further, when the operation knob of the lock release mechanism 33 is operated, the rotation operation member 44 is rotated in the clockwise direction in FIG. 7 via an operation wire (not shown). The operation pin 44 of the hook 34 is pushed downward by the operation protrusion 44a in accordance with the rotation operation of the lever 44, and at the same time, the hook 34 together with the operation pin 39 is rotated counterclockwise around the rotation pin 35. The fixing pin 30 and the hook 34 are disengaged by being rotated. Therefore, in this state, as shown in FIG. 15, for example, the rear side of the folding seat unit, which is folded by tilting the seat back 3 forward substantially parallel to the seat cushion 2, is connected to the front end side of the seat cushion 2. A tumble operation is performed in which the rotating pin 27 of the mechanism 12 is rotated forward and upward to hold it in a substantially upright state as shown in FIG.

Further, as shown in FIGS. 8 and 9, between the first upper bracket 41 and the upper rail 22, a lock member 49 between the lower rail 21 and the upper rail 22 and the lock member 49 are provided. A lock operation mechanism 48 for moving the member 49 in the lock direction or the lock release direction is mounted.

The lock member 49 is formed by a substantially linear square bar. The lock member 49 penetrates into the insertion holes 50 and 50 formed on both sides of the first upper bracket 41, respectively, and the sliding direction of the upper rail 22 is aligned with these insertion holes 50 and 50. It is held so as to be movable in the orthogonal direction.

Further, the lock operation mechanism 48 is provided with a rotation lever 51 as shown in FIG. The rotation lever 51 is rotatably attached to the first upper bracket 41 side through a rotation pin 52 at a substantially central portion.

Further, one end of the rotation lever 51 is rotatably connected to a substantially central portion of the lock member 49 via a rotation pin 52. The locking member 49 is moved in the direction orthogonal to the sliding direction of the upper rail 22 in accordance with the turning operation of the turning lever 51.

Further, a connecting portion 55 to which one end of an operating wire (not shown) is connected is provided at the other end of the rotary lever 51. The other end of the operating wire is connected to, for example, an operating knob for operating the walk-in.

Further, one end of a return spring 54 of the rotary lever 51 is fixed to the first upper bracket 41. The rotation lever 51 is constantly urged clockwise in FIG. 9 by the spring force of the return spring 54. Therefore, as shown in FIG. 9, the insertion holes 50, 50 of the first upper bracket 41 and the openings 32 of the second lower bracket 24 and the third lower bracket 29 are arranged opposite to each other (see The lock member 49 is inserted into the opening 32 side of the second lower bracket 24 and the third lower bracket 29 via the turning lever 51 in a state where the toe cushion 2 is held in the normal use position). In this state, the sliding motion between the lower rail 21 and the upper rail 22 is prohibited.

In addition, for example, when a counterclockwise force indicated by an arrow in FIG. 9 acts on the rotary lever 51 via an operation wire (not shown) in accordance with the operation of the operation knob for walk-in operation, The lock member 49 is pulled to the left in FIG. 9 against the spring force of the spring 54, and the lock member 49 is opened by the opening 32 of the second lower bracket 24 and the third lower bracket 29. It comes to come off. Therefore, in this state, the upper rail 22 is unlocked, so that the upper rail 22 is pulled forward by the spring force of the spring member 26 toward the retracted position, and the seat 1 is moved to the position shown in FIG. It is designed to be slid to the retracted position in the front. During the walk-in operation, the seat back 3 is moved from the normal use shape (the rearward tilted shape of the predetermined reclining adjustment range) to the forward tilted state. In this state, the seat cushion is moved. 2 is moved from the regular use position to the front retracted position to expand the rear seat entry / exit space area of the vehicle door opening.

Further, when the seat cushion 2 is returned from the front retracted position shown in FIG. 14 to the normal use position, the insertion holes 50 and 50 of the first upper bracket 41 and the second lower bracket 41. 24 and the opening 32 of the third lower bracket 29 are opposed to each other, the lock member 49 is moved by the spring force of the return spring 54 via the turning lever 51 to the second lower bracket 24 and the third lower bracket 24. The lower bracket 29 is inserted into the opening 32 side of the lower bracket 29 and is switched to a locked state in which the sliding operation between the lower rail 21 and the upper rail 22 is prohibited.

On the other hand, the seat back 3 is rotatably supported by the front end side connecting mechanism 12 from a normal use state (non-tumble position) to a folded state in which the seat cushion 3 is folded forward substantially parallel to the seat cushion 2. In addition, a self-supporting link mechanism 61 shown in FIG. 10 is provided on the seat cushion 2 for holding the seat unit in which the seat back 3 is tilted substantially in parallel in the tumble position.

The self-supporting link mechanism 61 is provided with a lower link 62 having a substantially U-shaped cross section and an upper link 63 having a substantially U-shaped cross section. In this case, the bottom portion 62a of the U-shaped cross section of the lower link 62 is formed with a bent portion that is bent in a generally U-shape toward the inside of the U-shaped cross section, and the U-shape of the upper link 63 is formed. The bottom portion 63a of the cross section is formed with a bent portion that is bent in a substantially V shape toward the outside of the U-shaped cross section.

Further, the separation distance between the both side portions 62b, 62b of the U-shaped cross section of the lower link 62 is set so that the both side portions 63b, 63b of the U-shaped cross section of the upper link 63 can be accommodated.

Further, both side portions 62 b, 62 b on one end side of the lower link 62 are located on both side portions of the rear end portion of the fixed bracket 28 on the vehicle body side of the front end side coupling mechanism 12, that is, from the rotating pin 27 of the fixed bracket 28. It is rotatably connected via pins 64 to positions separated by appropriate intervals.

Both side portions 62b, 62b on the other end side of the lower link 62 are rotatably connected to both side portions 63b, 63b on one end side of the upper link 63 via a connecting pin 65. In this case, the connecting pin 65 is fixed to, for example, the upper link 63 side, and the lower link 62 and the connecting pin 65 are rotatably connected.

Further, both side portions 63b, 63b on the other end side of the upper link 63 are rotatably connected to the seat cushion 2 side. In this case, a mounting bracket 66 of an upper link 63 having a U-shaped cross section is fixed to the lower rail 21 of the sliding mechanism 11 on the side of the seat cushion 2 at a position separated from the rotating pin 27 by an appropriate distance. Both side portions 63b, 63b on the other end side of the upper link 63 are rotatably connected to both side portions of the mounting bracket 66 via pins 67.

As shown in FIG. 11, the self-supporting link mechanism 61 connects the lower link 62 and the upper link 63 in the non-tumble position where the rear end side of the seat cushion 2 is connected to the vehicle body side. The pin 65 is held in a folded state centered around the pin 65, and as shown in FIG. 10, the lower link 62 and the upper link 63 are extended substantially linearly with the sheet unit moved to the tumble position. The seat unit is held in the tumble position by being deformed into a state in which the outer surface of the bottom portion 63a of the upper link 63 is joined to the inner surface of the bottom portion 62a of the lower link 62.

Further, the connecting holes 68 on both side portions 62 b, 62 b of the lower link 62 with the connecting pin 65 are formed to be larger than the outer diameter dimension of the connecting pin 65. Between the connecting hole 68 and the connecting pin 65, the links 62 and 63 are allowed to move in the directions between the supporting points when the sheet unit is rotated as shown in FIG. Appropriate play portions 68a are formed to keep the rotational movements of 62 and 63 in a smooth state.

Further, a substantially arcuate guide portion 69 is formed at an end portion of the side portion 62b of the lower link 62 on the side of the connecting portion with the connecting pin 65. An engaging projection 70 is formed on the side portion 63b of the upper link 63 so as to engage with the guide portion 69 when the sheet unit is moved to the tumble position. The sheet unit is moved to the tumble position by the guide portion 69 of the lower link 62 and the engaging projection 70 of the upper link 63, and the lower link 62 and the upper link 63 are engaged with each other. A play preventing means for preventing play at the connecting portion between the lower link 62 and the upper link 63 and the connecting pin 65 is formed.

Further, in the state of FIG. 10 in which the sheet unit is held at the tumble position, the center of rotation O ₁ of the connecting portion between the lower link 62 and the fixed bracket 28, the upper link 63 and the mounting bracket 66, and In the state in which the center O ₃ of the connecting pin 65 is eccentric in the direction of the rotating pin 27 of the fixed bracket 28 with respect to the straight line P connecting the rotational center O ₂ of the connecting portion between The sheet unit is held, and in this state, the sheet unit is prevented from rotating and returning toward the non-tumble position.

Next, the operation of the above configuration will be described.

First, at the non-tumble position where the rear end side of the seat cushion 2 of the seat 1 is connected to the vehicle body side, as shown in FIG. 11, the lower link 62 and the upper link 63 of the self-supporting link mechanism 61 are connected. Is held in a folded state in which the connection pin 65 is folded.

When moving the seat 1 to the tumble position, first, as shown in FIG. 15, the seat back 3 is seated around the second hinge portion 8 of the seat back support mechanism 6. The seat cushion 2 is rotated substantially parallel to the folded state of being folded forward.

Next, the operation knob of the lock release mechanism 33 is operated to release the engagement between the fixed pin 30 and the hook 34. Then, in this state, the rear side of the folding seat unit, which is folded by tilting the seat back 3 substantially in parallel with the seat cushion 2, is provided with the pivot pin 27 of the front end side connecting mechanism 12 of the seat cushion 2. A tumble operation is performed in which the tumble operation is performed by rotating the front part upward and upward and holding it in a substantially upright state as shown in FIG.

During the tumble operation, the lower link 62 of the self-sustaining link mechanism 61 rotates counterclockwise in FIG. 11 centering on the pin 64, and the upper link 63 centers the pin 67 in accordance with the rotation movement of the sheet unit. In the same figure, each is rotated clockwise. That is, the self-supporting link mechanism 61 is deformed between the lower link 62 and the upper link 63 in the direction in which the link pin 65 is opened.

At this time, as shown in FIG. 12, the sheet unit is connected to the lower link 62 and the upper link 63 of the self-supporting link mechanism 61 in a state where the sheet unit is in the middle of the movement operation between the non-tumble position and the tumble position. Since the play portion 68a of the connecting portion with the pin 65 allows the two links 62, 63 to move in the direction between the support points, both the links 62, 63 can be smoothly rotated.

Further, during the rotating operation of moving the seat unit to the tumble position, the engaging projection 70 of the upper link 63 is connected to the end of the guide portion 69 of the lower link 62 before the seat unit reaches the tumble position. The engaging protrusion 70 of the upper link 63 moves along the guide portion 69 as the upper link 63 is rotated clockwise around the pin 67.

Then, when the sheet unit is moved to the tumble position as shown in FIG. 1, the connecting pin 65 is connected to the connecting hole of the lower link 62 by the engaging projection 70 of the upper link 63 as shown in FIG. Since the play of the connecting portion between the lower link 62 and the upper link 63 and the connecting pin 65 is prevented by being pressed against the edge portion of 68, the rattling of the seat unit fixed at the tumble position is prevented. The sheet unit at the tumble position can be stably held by preventing the above.

When the sheet unit is moved to the tumble position as shown in FIG. 1, the self-supporting link mechanism 61 is rotated to a state where the lower link 62 and the upper link 63 are extended in a substantially straight line. The sheet unit is operated, and in this state, the inner surface of the bottom portion 62a of the lower link 62 is engaged with the outer surface of the bottom portion 63a of the upper link 63 so that the seat unit is held at the tumble position. As described above, when the seat unit is held at the tumble position, the rotation center O ₁ of the connecting portion between the lower link 62 and the fixed bracket 28 and the upper link 63 and the mounting bracket 66 are connected. The center O ₃ of the connecting pin 65 is held in a state of being eccentric in the direction of the rotating pin 27 of the fixed bracket 28 by an appropriate eccentric distance e with respect to the straight line P connecting the rotational center O ₂ of the connecting portion. .. Therefore, in this state, the sheet unit is prevented from turning back toward the non-tumble position.

When the sheet unit is returned to the non-tumble position by rotating, the sheet unit at the tumble position is moved upward so that the center O ₃ of the connecting pin 65 becomes the rotation center O ₁ and the rotation center O _1. By moving it on the straight line P connecting O ₂ and further to the right of the straight line P in FIG. 10, the turning back operation of the sheet unit in the non-tumble position direction is performed.

Therefore, in the above-described structure, the sheet unit is pivotally returned to the non-tumble position direction by the self-sustaining link mechanism 61 when the sheet unit is moved from the non-tumble position to the tumble position. Since this can be prevented, it is not necessary to manually operate the fixing mechanism for fixing the sheet unit at the tumble position, unlike the conventional case. Therefore, the work of fixing the sheet unit at the tumble position can be performed more easily than before, and the workability when tumble-operating the sheet unit can be improved.

Further, when the sheet unit is moved to the tumble position, the connecting pin 65 is pressed against the end edge portion of the connecting hole 68 of the lower link 62 by the engaging projection 70 of the upper link 63, Since the play of the connecting portion between the lower link 62 and the upper link 63 and the connecting pin 65 can be prevented to prevent rattling of the sheet unit fixed at the tumble position, the sheet unit at the tumble position is prevented. Can be kept stable.

The present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

[0057]

[Effect of the device]

 According to the present invention, one end is rotatably connected to the fixed bracket on the vehicle body side of the front end side connecting mechanism, and one end is rotatably connected to the free end side of the lower link via the connecting pin. , With the other end rotatably connected to the seat cushion side, and with the rear end side of the seat cushion connected to the vehicle body, connect the lower link and the upper link to the connecting pin. Hold the sheet folded in the center, hold the sheet unit in the tumble position, and engage the lower unit with the upper link in a substantially linear state to tumble the sheet unit. A self-supporting link mechanism that holds the position is provided, and the lower link and the upper link of this self-supporting link mechanism are connected to the connecting pin when the sheet unit rotates, and the link unit moves in the direction between the support points. The seat unit is moved to the tumble position and the lower link and the upper link are engaged with each other while providing a play part that holds the rotating motions of both links in a smooth state. Since play prevention means is provided to prevent play at the connection between the upper link and the connecting pin, the work of fixing the seat unit in the tumble position can be performed easily, and the seat unit can be tumble-operated. It is possible to improve the workability when moving, and to prevent the sheet unit fixed at the tumble position from rattling and to stably hold the sheet unit at the tumble position.

[Brief description of drawings]

FIG. 1 is a side view showing a tumble operation state of a sheet unit according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the appearance of the entire sheet.

FIG. 3 is a longitudinal sectional view showing a schematic configuration of a guide rail of the sheet slide mechanism.

FIG. 4 is a vertical cross-sectional view showing a fixing portion of a spring member on a lower rail side of a guide rail.

FIG. 5 is a vertical cross-sectional view showing a fixing portion of the spring member on the upper rail side of the guide rail.

FIG. 6 is a perspective view showing a rear end side connecting mechanism of the seat cushion.

FIG. 7 is a side view showing a locked state of the rear end side coupling mechanism of the seat cushion.

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a transverse cross-sectional view showing a schematic configuration of a lock operating mechanism for an upper rail and a lower rail.

FIG. 10 is a side view showing the self-supporting link mechanism in a state where the sheet unit is moved to the tumble position.

FIG. 11 is a side view showing the self-supporting link mechanism in a state where the sheet is held in the normal use position.

FIG. 12 is a side view showing the self-supporting link mechanism in a state where the sheet unit is moved and operated to an intermediate position between a normal use position and a tumble position.

FIG. 13 is a side view showing a state where the sheet is held in a normal use position.

FIG. 14 is a side view showing a state where the seat cushion is slid to the walk-in position.

FIG. 15 is a side view showing a seat unit in which a seat back is laid down on a seat cushion substantially in parallel.

[Explanation of symbols]

2 ... sheet cushion, 3 ... sheet back, 6 ... sheet back support mechanism, 12 ... front end side coupling mechanism, 13 ... floor panel

Claims (1)

Claims for utility model registration: Claim 1. The front end side of the seat cushion is rotatably connected to the vehicle body side through a rotating pin of a front end side connecting mechanism, and the rear end of the seat cushion. The seat side is detachably connected to the vehicle body side through a rear end side connecting mechanism, and the seat back is attached to the seat cushion side on the seat cushion side from the normal use state to the seat back. The seat cushion is rotatably supported in a folded state in which the seat cushion is folded forward substantially parallel to the seat cushion, and the seat cushion is seated on the seat cushion.
The rear side of the seat unit, in which the back bag is tilted substantially in parallel, is moved forward and upward about the pivot pin of the front end side connecting mechanism of the seat cushion to move to a tumble position in which it is erected substantially upright. In a vehicle seat structure including a tumble mechanism, a lower link having one end rotatably connected to a vehicle body side fixed bracket of the front end side connecting mechanism and a connecting pin having one end on a free end side of the lower link. And an upper link rotatably connected to the seat cushion at the other end thereof.
With the rear end side of the seat cushion connected to the vehicle body side, the lower link and the upper link are held in a folded state in which the lower link and the upper link are folded around the connecting pin, and the seat unit is moved to the tumble position. In this state, the lower link and the upper link are engaged in a state where they are extended in a substantially linear shape, and a self-standing link mechanism for holding the sheet unit at the tumble position is provided, and the lower link of the self-standing link mechanism is provided. And a play for allowing the connecting portion of the upper link and the connecting pin to move in the direction between the support points of the both links when the sheet unit is rotated, and for maintaining the rotating operation of the both links in a smooth state. The sheet unit is moved to the tumble position, and the lower link and the upper link are engaged with each other. Vehicle sheet, characterized in that a play preventing means for preventing the play of the connecting portion of a fine upper link and the connecting pins - DOO structure.