JPH1159249A - Table structure of seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the height of a table set in a horizontal position from being changed even if a seat back is vertically moved. SOLUTION: This structure has a seat body 3 comprising a seat bottom 31 and a seat back 34, and a table 6 provided on the back of the seat back 34. The height of the seat back 34 is adjustable. The structure is provided with a second bracket 42 provided on the rear end of a frame 2 and protruding backward and having a second horizontal shaft 54 extending in the direction of width, and a table support arm 51 rotatably supported by the second horizontal shaft 54 such that the position can be changed between an erect position of abutting on the back of the seat back 34 and a reclining position of separating from the back of the seat back 34 and having a third horizontal shaft 61 extending in the direction of width at the top thereof. The table 6 is rotatably supported by the third horizontal shaft 61 such that the position can be changed between an erect position and a horizontal position and is set always at the same height in the horizontal position irrespective of the height of the seat back 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat table structure applied to a railway vehicle, an automobile, an aircraft, a ship, a theater or the like.

[0002]

2. Description of the Related Art Conventionally, seats with tables are provided in railway cars, automobiles, aircraft, ships, theaters, and the like. Usually, this seat with a table is attached to a frame arranged on the floor, and a seat bottom as a seated seat, a seat back as a backrest erected from the rear end of the seat bottom, and a seat back And a table provided on the back of the camera. The seat bottom is fixed to the frame, and the seat back is rotatably supported about a first horizontal axis provided in the rear portion of the frame and extending in the width direction. It is configured to lock the rotation at the rotation position of, and the seated person can arbitrarily set the tilt angle of the seat back by operating the lock mechanism.

[0003] The table is provided on the distal end side of a support arm whose lower end is connected to a frame. Specifically, the lower end of the support arm is rotatably supported around the first horizontal axis, and a second horizontal axis is provided at the upper end. The table is rotatably supported about a second horizontal axis between an upright posture and a horizontal posture.

Therefore, the support arm whose distal end is separated from the seat back is turned around the first horizontal axis in the direction of the seat back, and the table is turned around the second horizontal axis to be set in the upright posture. As a result, while the table is stored on the back of the seat back, the support arm is rotated about the first horizontal axis to tilt backward by pulling out the stored table, and the table is rotated about the second horizontal axis. The table is moved to a horizontal position, so that the occupant of the rear seat can use the table.

[0005]

Meanwhile, among the above-mentioned conventional seats, there is one that is configured so that the height position of the seat back can be adjusted. In the seat back whose height can be adjusted, the first horizontal axis supporting the seat back is supported by a frame so as to be able to move up and down, and is configured to be locked to the frame at a desired height.

However, in such a seat whose height can be set, both the seat back and the support arm are supported by the second horizontal axis. Accordingly, the height position of the table also changes, which causes a problem that a seated person in the rear seat cannot place beverages or the like on the table with security, and accordingly, the rear seat back has a problem. Conventionally, there is no seat capable of adjusting a height position of a seat back in a seat configured to be capable of storing a table.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a seat table structure in which the height of the table does not change even when the seat back is raised or lowered. The purpose is.

[0008]

According to a first aspect of the present invention, there is provided a seat table structure including a frame disposed on a floor, a seat bottom attached to the frame, and a standing portion provided at a rear portion of the seat bottom. A seat body made of a seat back, and a table support arm provided so as to be changeable in posture between an upright posture stored on the back side of the seat back and an inclined posture separated from the back side,
A table provided at the upper end of the table support arm so that the posture can be changed between the inclined posture and the horizontal posture in a state where the table support arm is set in the inclined posture, and interlocked with the seat back seat angle. A seat table structure configured such that the height position of the rear portion of the seat bottom is adjustable, wherein the seat back is held up and down so that the height position decreases as the seat angle increases. While the first holding means is provided, the second holding means for holding the table support arm so as to be changeable in posture is provided, and the second holding means is provided with a height of the table set in a horizontal posture. The position is configured to be constant independently of the elevation of the seat back.

According to the seat table structure, the height of the seat back is freely set by the operation of the first holding means, while the table is set by setting the table support arm in the upright posture. By being stored on the back of the back, the table support arm is set to the inclined position by the operation of the second holding means, and the table is set to the horizontal position, so that the seated person of the rear seat can use this table. Ready to do so.

The second holding means operates so that the height position of the table set in a horizontal posture by an operation independent of the first holding means becomes constant independently of the elevation of the seat back. Since the table is configured, the height position of the table in the horizontal posture is always set to be the same without being affected by the fluctuation of the vertical position of the seat back.

In the seat table structure according to a second aspect of the present invention, in the seat table structure according to the first aspect, the second holding means is configured such that the table support arm is housed on the back side of the seat back. The first
Characterized in that it is configured to operate in conjunction with the holding means.

According to this table structure of the seat, when the table is stored on the back of the seat back, the table is moved up and down by the interlocking operation of the second holding means with the first holding means. To go up and down accordingly
A sliding state does not occur between the stored table and the back portion of the seat back, so that the seat back can be easily moved up and down, and the stored state of the table can be stabilized.

According to a third aspect of the present invention, in the seat table structure of the first or second aspect, the first holding means is provided between the frame and the seat back. Characterized by a quadrilateral link structure.

According to the seat table structure, the seat back angle can be changed while the relative positional relationship between the seat back and the seat bottom is maintained substantially constant. Accordingly, in a so-called reclining posture in which the seat back angle of the seat back is increased, the front end side of the seat bottom is lifted upward, thereby realizing a more relaxed seating on the seat.

According to a fourth aspect of the present invention, in the seat table structure of the first or second aspect, the first holding means is provided between the frame and the seat back. And a pentagonal link structure.

According to the table structure of the seat, the pentagonal link structure has a greater degree of freedom in shape deformation than the quadrilateral link structure. By increasing the height, the height of the seatback is lowered, and the seat bottom can be advanced with respect to the seatback so as to be positioned slightly forward of the seatback. When the seat back is set in a reclining position, the seat angle of which is increased, that is, when the seat is set in a reclining position, the entire length of the seat is slightly longer than when the seat back is set in a sitting position. It can be used more comfortably.

According to a fifth aspect of the present invention, in the seat table structure according to any one of the first to fourth aspects of the present invention, the second holding means includes a bracket provided on the frame. And the base end is pivotally supported by the bracket so as to be rotatable around the first horizontal axis.
A link arm whose distal end is rotatably supported by the table support arm so as to be rotatable around a second horizontal axis, and a guide shaft protruding from a lower end of the table support arm and extending outward. The bracket has a guide slot formed therein for guiding the guide shaft. The guide slot has a vertically elongated hole corresponding to the elevation of the seat back, and a lower end of the elongated hole. And a horizontally elongated hole extending forward from the part.

According to the seat table structure, when the table is raised and lowered, the guide shaft provided at the lower end of the table support arm is guided by the vertically long guide holes to move up and down. Therefore, when the seat back is moved up and down in a state where the table is stored on the back of the seat back, the table moves up and down accompanying the vertical movement of the seat back. Accordingly, when the table cannot be moved up and down, the inconvenience of rubbing between the seat back and the table when the seat back is moved up and down, which hinders the smooth vertical movement of the seat back is avoided. .

When the table accommodated in the back of the seat back is to be changed to the horizontal posture in the upright posture, only the table support arm is lowered until the guide shaft reaches the lower end of the vertically long hole. By pulling the upper end of the arm backward, the table support arm rotates around the first horizontal axis and is pulled backward from the seat back while the guide shaft is guided by the horizontally long hole. In this state, the table is rotated rearward around the second horizontal axis, so that the table is pulled out rearward from the seat back to be in a horizontal posture.

As described above, since the guide shaft is provided on the table support arm and the bracket is provided with the guide elongated hole composed of the vertically elongated hole and the horizontally elongated hole for guiding the lifting and lowering of the guide shaft and the rotation about the second horizontal axis. For vertical movement of the seat back, the table is pulled out from the back of the seat back with the guide shaft reaching the lower end of the vertically long hole while being guided by the vertically elongated hole and accompanying the seat back, The table drawn by
It is always at a constant height position without being affected by the height position of the seat back.

According to a sixth aspect of the present invention, in the seat table structure according to any one of the first to fourth aspects, the second holding means includes a bracket provided on the frame. And the base end is pivotally supported by the bracket so as to be rotatable around the first horizontal axis.
A link arm having a distal end side pivotally supported by the table support arm so as to be rotatable around a second horizontal axis, and a base end side pivotally supported by the bracket so as to be rotatable around a third horizontal axis;
A distal end side is formed with a second link arm substantially parallel to the link arm, which is rotatably supported on the table support arm around a fourth horizontal axis, and the second link arm includes the second link arm. (4) A link elongated hole extending in the longitudinal direction for guiding the horizontal axis is provided.

According to this table structure of the seat, the table support arm and the bracket are connected to each other by the quadrilateral link structure formed by the link arm and the second link arm. It can be moved up and down according to the link movement of this quadrilateral link structure, and it goes up and down following the up and down movement of the seat back. And
Since the second link arm is provided with a link elongated hole for guiding the fourth horizontal axis, the fourth horizontal axis is movable within a range where the link elongated hole is formed. Is rotatable around a second horizontal axis between a position where it is stored in the seat back and a position where it is pulled out from the seat back by forward and reverse rotation within the movement range of the fourth horizontal axis. Therefore, when the table support arm is stored on the back surface of the seat back, it can be moved up and down following the elevation of the seat back, and can be pulled out from the back surface of the seat back at an arbitrary position. In addition, the table support arm can be set at the lowest position in a state where the table support arm is pulled out, so that the height position of the table can be kept constant regardless of the height position of the seat back. Will be possible. By adopting the quadrilateral link structure for the displacement of the table support arm, the table support arm can be raised and lowered more smoothly.

According to a seventh aspect of the present invention, in the seat table structure according to any one of the first to sixth aspects, the table support arm is inclined obliquely upward toward the seat back. While the urging means for urging is provided, a regulating means for regulating the upward movement of the stored table support arm is provided on the back surface of the seat back.

According to this table structure, the table support arm is always urged by the urging force of the urging means in the direction in which it comes into contact with the rear surface of the seat back, and is brought into contact with the rear surface of the seat back by the regulating means. Since the upward movement of the table support arm in this state is restricted, the stored state of the table on the back surface of the seat back is stabilized.

[0025]

FIG. 1 is an exploded perspective view showing a first embodiment of a seat table structure according to the present invention in rear view, and FIG. 2 is an assembled perspective view of its skeleton. FIG. 3 is a partial cross-sectional side view of the sheet shown in FIG. 4 and 5 are external views of the seat shown in FIG. 2 in a rear view. FIG. 4 shows a state in which the table is stored in the back of the seat back. FIG. 5 shows a state in which the table is pulled out from the back of the seat back. Each state is shown. 1 and 2, the XX direction is referred to as a width direction, the YY direction is referred to as a front-rear direction, and particularly, the -X direction is leftward, the + X direction is rightward, the -Y direction is forward, and the + Y direction. Is called backward. As shown in these figures, the seat 1 is composed of a frame 2 disposed on a floor F, a seat bottom 31 attached to the frame 2 and a seat back 34 erected at the rear of the seat bottom 31. A seat body 3, a bracket 4 provided behind the frame 2 and supporting the seat body 3, a table support 5 having a lower end connected to the bracket 4, and a table support 5. It has a basic configuration consisting of a flat table 6 provided at the upper end.

In the present embodiment, the frame 2 is formed to be long in the width direction, so that the seat body 3 for two seats is disposed on the frame 2 as an example. For convenience of illustration, only one seat body 3 is shown. Such a frame 2 has a rectangular base frame 21 in a plan view including a pair of long frames 22 in the front-rear direction and a pair of short frames 23 in the width direction, and a long front and rear portion at the center in the width direction of the base frame 21. A central bridge frame 24 is bridged between the frames 22, and a pair of side bridge frames 25 bridged between the long frames 22 on both sides in the width direction of the central bridge frame 24.

A frame support 20 is interposed between the floor F and the central bridge frame 24 and the side bridge frame 25 of the base frame 21. The vertical dimension of the frame support 20 is set so that the seat surface of the seat bottom 31 is positioned at a position where the seat surface of the seat bottom 31 is easily seated when the seat body 3 is supported by the frame 2. This frame support 20 is provided with a rotation mechanism (not shown),
Thus, the frame 2 is rotatable around a center extending in the vertical direction by the rotation mechanism, and the seat 1 can be set backward by rotating the frame 2 by 180 °.

A central upright frame 26 projecting upward is integrally provided at a rear portion of the central bridge frame 24, and a width of the central upright frame 26 is provided at a rear portion of the short frame 23. A side upright frame 27 facing in the direction is provided, and the seat body 3 and the table support 5 are connected to the short frame 23 via the bracket 4 and the upright frames 26 and 27.

The seat bottom 31 is composed of a bottom cushion 32 in which the surface of a pad material made of foamable synthetic resin is covered with a trim, and a bottom frame 33 that supports the bottom cushion 32. Above bottom cushion 3
2 is fixed to the bottom frame 33 by bolting or the like. Protrusions 33a extending in the front-rear direction are provided on both sides in the width direction of the bottom frame 33, and the seat body 3 is attached to the frame 2 via the protrusions 33a.

The seat back 34 covers a back cushion 35 in which the surface of a pad material made of a foamable synthetic resin is covered with trim, a back frame 36 for supporting the back cushion 35, and a back surface of the back frame 36. A back cover 37 is provided. The back frame 36 is formed by bending a metal pipe into a square ring and welding both ends.
A pair of back brackets 36a extending in the vertical direction are provided on the lower half of both sides in the width direction of the back frame 36.
Has been fixed. The back frame 36 is attached to the frame 2 via the back bracket 36a.

The back cover 37 is shaped so as to be externally fitted on the back side of the back frame 36 by a plate-shaped molded product made of synthetic resin. This back cover 3
Reference numeral 7 denotes a back plate 37a, a pair of side plates 37b protruding forward from substantially upper halves of both sides in the width direction of the back plate 37a, and a front plate protruding from a lower edge of the back plate 37a. And a lower plate 37c.

When the back cushion 35 is mounted on the front side of the back frame 36, the back cover 3
The back cover 37 is attached to the back frame 36 by covering the back frame 36 and the back cushion 35 from behind and fixing the side plate 37b and the lower plate 37c to the back frame 36 by screws or the like. The vertical dimension of the side plate 37b is set so that the back bracket 36a is exposed to the outside from the back cover 37 when the back cover 37 is mounted on the back frame 36.

A storage recess 37d conforming to the external shape of the table support 5 and the table 6 is formed in the back of the rear plate 37a, and the table support is set upright in the storage recess 37d. The body 5 and the table 6 are stored. This storage recess 37
A restricting means for restricting the upward movement of the table support arm 51 stored in the storage recess 37d is formed at the upper edge of d. The table support arm 51 is prevented from moving upward by the front edge of the table 6 abutting on the upper edge.

The bracket 4 is, as shown in FIG.
The first bracket 41 is fixed on the short frame 23 and the central bridge frame 24 on the front side of the upright frames 26 and 27, and the second bracket 42 is fixed on the rear side. . The first bracket 4
1 is provided with an upper link arm 41b and a lower link arm 41c whose one ends are rotatably supported around a pair of upper and lower front support shafts 41a. The other end of each of the link arms 41b and 41c has a pair of upper and lower rear support shafts 41d.
It is connected to a relay plate 28 having a triangular shape in a side view while being pivotally supported so as to be rotatable around. These upper link arms 41
b and the lower link arm 41c form the first holding means of the present invention.

The relay plates 28 are provided in a pair in the width direction, and a connecting rod 28c is inserted between the relay plates 28 so that the right and left relay plates 28 can move in the same manner by the connecting rods 28c. I have to.

The front support shafts 41a and 41d are set so that the upper link arm 41b and the lower link arm 41c are parallel to each other. The upper link arm 41b, the lower link arm 41c, and the first bracket 41
A portion between the pair of front support shafts 41a and a portion between the pair of rear support shafts 41d of the relay plate 28 form a quadrilateral link structure. With this link structure, the relay plate 28 draws an arc-shaped curved locus. While going up and down.

On the pair of relay plates 28, long support members 28a each having a U-shape in cross section are provided at the same height. Each support member 28a is integrally fixed to the relay plate 28 by welding or the like so as to form a gentle upward slope toward the front. Further, these support members 28a are provided so that their respective opening surfaces face each other, whereby the mounting grooves 28b facing each other are formed in each support member 28a. By fitting the projections 33a of the bottom frame 33 into these mounting grooves 28b, the seat bottom 31 is mounted on the frame 2 via the support members 28a.

The seat back 34 is fixed to the relay board 28 by fixing the respective back brackets 36a of the back frame 36 to the relay board 28 by bolts.
And is attached to the frame 2 via the.

The length of the upper link arm 41b is set to be longer than the length of the lower link arm 41c, and the seat back 34 stands upright at the rear end of the seat bottom 31. In this state, the mounting positions are set such that the link arms 41b and 41c are inclined upward and rearward.

Therefore, when a downward force is applied to the seat back 34, the link arms 41b and 41c perform a link motion of rotating clockwise around the respective front support shafts 41a, and the seat back 34 descends. ,At this time,
Since the upper link arm 41b is longer than the lower link arm 41c, the rear support shaft 41d of the lower link arm 41c projects rearward from the rear support shaft 41d of the lower link arm 41c as each link arm 41b, 41c approaches the horizontal posture. As a result, the upper portion of the relay plate 28 is pushed rearward, and the seat back 34 fixed to the relay plate 28 assumes an inclined posture inclined rearward.

A lock mechanism (not shown) for locking the set seating posture of the seat back 34 is provided at an appropriate position of the frame 2, and when the seat back 34 is tilted, a desired tilt angle is obtained. By operating the lock mechanism, the inclination angle of the seat back 34 is fixed.

The second bracket (bracket body) 4
2 has a front edge and a lower edge formed by a flat plate fixed to the side upright frame 27 and the short frame 23, respectively, and has a support hole 43 formed in the upper front part, and a rear edge and a lower edge. An L-shaped elongated guide hole 44 is formed along the edge. This guide slot 44
Is a vertically long hole 44a extending in the vertical direction, and a horizontally long hole 4 extending in the front and rear direction and having a downwardly convex arc shape.
4b. Then, the table support 5
Are linked to the second bracket 42 via the support holes 43 and the guide elongated holes 44.

The table support 5 includes a pair of table supporting arms 51 in the width direction connected by a pair of upper and lower connecting rods 52 (an upper connecting rod 52a and a lower connecting rod 52b). And a pair of link arms 53 in the width direction attached to the arm.

The upper connecting rod 52a is provided so that both ends thereof penetrate the table supporting arm 51 slightly below the vertical intermediate portion of the table supporting arm 51, and extend in the width direction at a portion which penetrates and projects outside. While a pair of second horizontal shafts 54 are formed, the link arms 53
Is connected to the second horizontal shaft 54 at one end thereof, and is rotatably supported around the second horizontal shaft 54.

Further, a through hole 51a extending in a direction facing each other is formed in the upper end of each of the table support arms 51, and a third horizontal shaft 61, which will be described later, is inserted through the through hole 51a. The table 6 is rotatably supported around a third horizontal axis 61 so that the table 6 can change its posture between an upright posture and a horizontal posture.

The pair of link arms 53 are provided at the other ends thereof with first horizontal shafts 56 extending in opposite directions in the width direction, and the first horizontal shafts 56 are fitted into the support holes 43 of the second bracket 42. As a result, it is rotatably supported about the first horizontal shaft 56. Therefore, the table support arm 51 can rotate around the first horizontal axis 56 via the link arm 53 and can rotate around the second horizontal axis 54 while rotating.

The lower connecting rod 52b has both ends protruding outward through the respective table support arms 51, and a pair of guide shafts 57 in the width direction are formed at the protruding portions. 57 are respectively fitted in the left and right guide slots 44. Then, in a state where the guide shaft 57 is located in the vertically long hole 44a, each table support arm 51 and the table 6 in the upright posture are fitted into the storage recess 37d of the back cover 37 of the seat back 34, and the guide shaft 57 is The size is set so that the guide member can rotate around the second horizontal shaft 54 while being guided by the horizontally long hole 44b in the state of being positioned in the horizontally long hole 44b.

The guide shaft 57 has a roller 57a at its tip end rotatably mounted around its own axis. The outer peripheral surface of the guide shaft 57 is rotated by abutting the inner edge of the elongated hole 44a. Accordingly, the movement guided by the vertically long hole 44a of the guide shaft 57 is smoothly performed. In the first embodiment, the link arm 53 and the guide slot 4
4 of the present invention by the guide shaft 57 guided to
Are formed.

The horizontal hole 44b is shaped so as to follow an arc centered on the second horizontal shaft 54 when the guide shaft 57 is located at the lower end of the vertical hole 44a. From the point in time when the table support arm 51 reaches the lower end of the vertically long hole 44a, the table support arm 51 rotates forward and reverse around the second horizontal axis 54 in a state where the position of the second horizontal axis 54 has been set, and tilts upright. The posture is changed between the posture and the posture.

The second horizontal shaft 54 has a link arm 5
A lever piece 58 sandwiched between the third piece 3 and the table support arm 51 is rotatably provided, and a coil spring 59 is provided at the tip of the lever piece 58. The distal end of the coil spring 59 is connected to the top of each of the upright frames 26 and 27 in a tensioned state so that the urging force of the coil spring 59 presses the table support 5 into the recess 37 d of the back cover 37. Has become.

Therefore, with the guide shaft 57 positioned at the lowermost end of the vertically long hole 44a, the table support arm 51 is moved to the second position.
By rotating clockwise about the horizontal axis 54, the table 6 housed in the housing recess 37d becomes a coil spring 59.
The table 6 is pulled out to the outside against the urging force, and the table 6 pulled out is rotated counterclockwise around the second horizontal axis 54 via the table support arm 51.
The table 6 is stored in the storage recess 37d, and the stored state is stabilized by the urging force of the coil spring 59.

When the guide shaft 57 is positioned at the front end of the horizontally long hole 44b, the table support arm 51 can also move the second horizontal shaft 5 by the urging force of the coil spring 59.
The shape or dimensions are set so as not to rotate counterclockwise four times.

The table 6 is set in a rectangular shape in which the width dimension is set larger than the front-back dimension in the horizontal posture. A pair of column-shaped third horizontal shafts 61 project from the base 6 on both side edges in the width direction on the base end side, with the axis extending in the width direction. While a female screw is screwed on the end face of each third horizontal shaft 61, a male screw 55 screwed to the female screw is provided, and the male screw 55 is screwed and fastened to the female screw of the third horizontal shaft 61. The third horizontal shaft 61 is attached to the table support arm 51 in a state where the third horizontal shaft 61 is locked by the head of the male screw 55, whereby the table 6 is attached to the table support arm 51 so as to be rotatable around the third horizontal shaft 61. I have.

On both side edges in the width direction of the table 6, in the vicinity of the third horizontal shaft 61, a protruding piece 62 protruding in the width direction is protruded outward. The table support arm 51 has an arc hole 51b formed in front of the through hole 51a so as to correspond to the projecting piece 62. These arc holes 51b are formed so as to follow an arc centered on the through hole 51a, and each of the projecting pieces 62 corresponds to an arc corresponding to each of the third horizontal shafts 61 fitted in the through hole 51a. By being fitted into the hole 51b, the table 6 can change its posture between an upright posture extending upward and a horizontal posture extending horizontally.

Further, the table 6 is provided with an operation recess 63 formed by recessing a corner of a front end side edge of the back surface, and a finger is inserted into the operation recess 63 and pressed in a predetermined direction. Thereby, the operation of pulling out the table 6 from the back of the seat back 34 and the operation of storing it in the back of the seat back 34 are performed.

On the other hand, the back cover 37 of the seat back 34 has a rod-like shape which is rotatably supported on the upper edge of the storage recess 37d and corresponding to the operation recess 63 so as to be rotatable around the retaining shaft 64a. Locking piece 64 is provided. The locking piece 64 is dimensioned such that the side portion of the locking piece 64 extends over the storage recess 37d in a state where the locking piece 64 extends vertically. Therefore, in a state where the table 6 is stored in the storage recess 37d, the locking piece 64 is rotated around the retaining shaft 64a to position the side of the locking piece 64 in the storage recess 37d. The portion enters the operation concave portion 63, thereby preventing the table 6 from falling out of the storage concave portion 37d, and stabilizing the stored state of the table 6.

FIGS. 6 and 7 are side views of the seat 1 for explaining the operation of the table structure of the first embodiment. FIG. 6 is an explanatory view of the opening and closing operation of the table 6. (A) is a state in which the table 6 is set in the upright posture and is stored in the storage recess 37d of the seat back 34, (B).
Shows a state in which the table 6 is pulled out of the storage recess 37d and shifts to a horizontal posture, and (c) shows a state in which the table 6 is pulled out of the storage recess 37d of the seat back 34 and is set in the horizontal posture. . FIG.
Is a table 6 that is linked to the elevation of the seat back 34
7A and 7B are explanatory diagrams of the lifting / lowering operation of FIG.
4 is at the highest position, (b) is the seat back 34
Indicates the state at the bottom.

First, the opening and closing operation of the table 6 will be described with reference to FIG. In the state shown in FIG. 6A, the table support arm 51 and the table 6 are respectively lifted upward in the upright posture and housed in the housing recess 37d of the seat back 34. The storage state of the table 6 is as follows.
8 and is maintained by the urging force of a coil spring 59 stretched between the upright frames 26 and 27. In this state, the guide shaft 57 of the table support arm 51 is located at the uppermost position of the vertically long hole 44a of the bracket 4. The locking piece 64 is set in a vertical position, and the lower end of the locking piece 64 is attached to the table 6.
Of the table 6 is prevented from being opened.

The table 6 in the housed state shown in FIG.
When the table 6 is pulled out from the storage recess 37d, first, the locking piece 64 is turned 90 ° around the locking shaft 64a to release the locking of the table 6 by the locking piece 64, and the table 6 can be pulled out rearward. I do. In this state, the operation recess 6
When the user inserts a finger into 3 and presses the table 6 downward, as shown in FIG. 6B, the table support arm 51 is pressed downward and descends. This lowering causes the link shaft 53 to rotate around the first horizontal shaft 56 while the guide shaft 57 is
Since the table support arm 51 descends while being guided by 4a, the upright posture of the table support arm 51 is maintained until the guide shaft 57 reaches the lowermost end of the vertically long hole 44a.

After the guide shaft 57 reaches the lowermost end of the vertically long hole 44a, the table 6 is moved backward, so that the guide shaft 57 is guided by the horizontally long hole 44b and the table support arm 51 is moved to the second position. When the guide shaft 57 rotates clockwise about the horizontal axis 54 and the guide shaft 57 abuts on the front end of the horizontally long hole 44b, the horizontal position is set on the back of the seat back 34 as shown in FIG. Table 6
Is expanded.

In order to store the table 6 set in the horizontal position in the storage recess 37d of the seat back 34, the table 6 in the unfolded state shown in FIG.
After turning around counterclockwise to set upright posture,
Press in the direction of the seat back 34. Then, the guide shaft 57 abuts on the rear end of the long hole 44b and is located at the lower end of the vertically long hole 44a ((b) in FIG. 6). In this state, by pushing up the lower edge of the table 6 upward, the guide shaft 57 is guided by the vertically long hole 44a, and the second horizontal shaft 54 rotates around the first horizontal shaft 56 via the link arm 53. The table 6 rises while slidingly contacting the wall surface of the storage recess 37d and is stored in the storage recess 37d. By stopping the movement of the table 6 by operating the locking pieces 64 in a state where the table 6 is stored in the storage recess 37d, the stored state of the table 6 is stabilized as shown in FIG.

Next, the raising and lowering operation of the table 6 linked to the raising and lowering operation of the seat back 34 will be described. As shown in FIG. 7A, when the seat back 34 is set at the highest level, the table 6 is lifted upward by the urging force of the coil spring 59, and the table 6 The upper edge is in contact with the upper edge in the storage recess 37d of the seat back 34. In this state, the guide shaft 57 is in contact with the upper edge of the vertically long hole 44a.

Next, when the seat back 34 is lowered, the upper edge of the table 6 is pressed by the upper edge of the storage recess 37d, and is lowered with the lowering of the seat back 34. When the seat back 34 is set at the lowest level, the guide shaft 57 is moved to the position (b) in FIG.
As shown in FIG. 7, the state is located at the lowermost end of the vertically long hole 44a.

As described above, in the present embodiment, since the table 6 is moved up and down in conjunction with the elevating operation of the seat back 34, the seat back 3 of the table 6 is moved up and down.
4, the storage position on the back surface does not change, and the storage state of the table 6 in the storage recess 37d is stabilized. Regardless of the height position of the table 6 in the stored state, the table 6 is configured such that the guide shaft 57 is once pushed down to the lowermost position of the vertically long hole 44a and then pulled out from the storage recess 37d. Therefore, regardless of the height position of the seat back 34, the height position of the table 6 pulled out and set in the horizontal posture is always the same, and in the state where the table 6 is set in the horizontal posture, Even if there is a change in the height position, the height position of the table 6 does not change, and the height position of the table 6 changes, thereby causing any inconvenience such that the tableware placed on the table 6 rolls over. Absent.

FIG. 8 is an exploded perspective view showing a second embodiment of the seat table structure according to the present invention, and FIG. 9 is an assembled perspective view thereof. As shown in these figures, in the table structure according to the second embodiment, the table support 5 is displaced by a quadrilateral link structure similarly to the seat body 3. Specifically, instead of the second bracket 42 in which the guide slot 44 of the first embodiment is formed,
Fourth bracket 42 in which guide long hole 44 is not formed
0, the lower end of the table support arm 51 is rotatably supported by the guide shaft (fourth horizontal shaft) 57 of the first embodiment and is substantially parallel to the link arm 53. A second link arm 570 is provided. In the fourth bracket 420, a lower support hole 430 is provided below the support hole 43 through which the first horizontal shaft 56 of the link arm 53 is inserted to support the second link arm 570.

The second link arm 570 has substantially the same length as the upper link arm 53, and is inserted into the lower support hole 430 protruding from the front end (left side in FIG. 8). It has a third horizontal shaft 571 that passes through it, and a link long hole 572 protruding from the rear end side so as to extend in the longitudinal direction. In the second embodiment, the link arm 53 and the second link arm 570 having the long link hole 572 form a second holding unit according to the present invention.

Then, the first horizontal shaft 56 of the link arm 53 is fitted into the support hole 43 of the fourth bracket 420 in a sliding contact state, and the third horizontal shaft 571 of the second link arm 570 is attached to the lower portion of the fourth bracket 420. In a state of being fitted in the support hole 430 in a sliding contact state, an insertion hole 531 at the rear end of the link arm 53 is provided.
In the sliding contact state, is externally fitted to the side end of the second horizontal shaft 54 and screwed, and the link long hole 57 of the second link arm 570 is provided.
2 is externally fitted to the side end of the guide shaft 57 and screwed, so that the link arm 53, the second link arm 570, the second horizontal shaft 54 and the guide shaft 57 are connected as shown in FIG. Table support arm 51, support hole 43 and lower support hole 4
A quadrilateral link structure is formed with the fourth bracket 420 between the 30 and the table support arm 51 so that the table support arm 51 can move up and down following the up and down movement of the rear part of the seat body 3.

The pair of fourth brackets 420 include
Stoppers 421 projecting in the direction opposite to each other slightly obliquely below the lower support hole 430 and projecting therefrom are provided, and the second link arm 570 is connected to the stopper 42.
1 so that the table support arm 51 is prevented from descending below a predetermined lower limit position.

FIG. 10 is a side view of the seat 1 for explaining the operation of the table structure of the second embodiment. FIG. 10A shows the table 6 with the seat back 34 positioned at the uppermost position. Is stored in the storage recess 37d of the seat back 34, and (b) shows a state in which the seat back 34 is pulled out of the storage recess 37d in the table 6 with the seat back 34 positioned at the lowest position and set in the horizontal posture. I have.

First, in the state shown in FIG. 10A, the table support arm 51 and the table 6 are respectively lifted upward in the upright posture and stored in the storage recess 37d of the seat back 34. The locking piece 64 is set in a vertical position, and the lower end thereof has an operating recess 63 of the table 6.
, Thereby preventing the table 6 from being opened.

The guide shaft 57 of the table support arm 51 is located at the rear end (right side in FIG. 10) of the link long hole 572 of the second link arm 570. When the table 6 is moved up and down, the table support arm 51 follows the up and down movement by the link motion of the quadrilateral link structure composed of the upper and lower link arms 53 and 570.
The inconvenience of deviating from does not occur.

Next, the drawing operation of the table 6 will be described with reference to FIGS. Incidentally, in FIG. 10B, the seat back 34 is set at the lowest position before the table 6 is pulled out. When pulling out the table 6 in the storage state into the storage recess 37d, first, the locking piece 64 is moved around the locking shaft 64a by 9 degrees.
The table 6 is turned by 0 ° to release the locking of the table 6 by the locking pieces 64 so that the table 6 can be pulled out rearward. In this state, when a finger is inserted into the operation concave portion 63 and the table 6 is pressed downward, the table support arm 51 is pressed downward and descends as shown in FIG. This lowering causes the link arm 53 to rotate clockwise about the first horizontal axis 56, and the second link arm 570 also rotates clockwise about the third horizontal axis 571 and lowers, and the stopper 42
1 and the lowest position of the table support arm 51 is maintained.

After the table support arm 51 is set at the lowest position, the table 6 is moved rearward, whereby the table support arm 51 is rotated clockwise around the second horizontal axis 54. The guide shaft 57 moves forward (to the left in FIG. 10) while being guided by the link long hole 572 of the second link arm 570, whereby the table support arm 51 is pulled out of the storage recess 37d.
By rotating the table 6 clockwise around the third horizontal axis 61 in this state, the table 6 set in a horizontal posture on the back of the seat back 34 is developed as shown in FIG. You.

In order to store the table 6 set in the horizontal position in the storage recess 37d of the seat back 34, the table 6 in the unfolded state shown in FIG.
After turning around counterclockwise to set upright posture,
Press in the direction of the seat back 34. Then, the guide shaft 57 rotates counterclockwise about the second horizontal shaft 54, and the second link arm 570 moves to the rear end side of the link elongated hole 572. In this state, by pushing up the lower edge of the table 6 upward, the table 6 rises while slidingly contacting the wall surface of the storage recess 37d by the link motion of the upper and lower link arms 53, 570, and is stored in the storage recess 37d. . By stopping the movement of the table 6 by operating the locking pieces 64 in a state where the table 6 is stored in the storage recess 37d, FIG.
As shown in (a) of FIG.
It is stored in the back of the.

As described in detail above, the table structure of the second embodiment employs a quadrilateral link structure including the link arm 53 and the second link arm 570 in the mechanism for changing the attitude of the table support arm 51. Therefore, the table support arm 51 can be moved up and down more smoothly than in the first embodiment in which the guide shaft 57 slides in the vertically long hole 44a of the second bracket 42.

FIG. 11 is a perspective view showing another embodiment of the link structure according to the present invention.
(B) is an assembly perspective view. FIG. 12 is a side view for explaining the operation of the link structure according to another embodiment. FIG. 12A is a state in which the seat back 34 is set in the upright posture, and FIG. Numeral 34 indicates a state in which the inclined posture is set. FIG. 11 shows only a portion related to the pentagonal link structure. In this embodiment, a lower small bracket 29 (FIG. 12) is provided on the frame 2 of the seat body 3a in front of the first bracket 41 to project upward, while the lower frame 33 is also provided on the bottom frame 33. Bracket 29
The upper small bracket 39 corresponding to is protruded downward. And these small brackets 29, 39
A front link arm 45 (FIG. 12) is interposed between the pair of upper and lower connecting shafts 239 extending in the width direction, so that the front portion of the seat bottom 31 moves out of the rotation range of the front link arm 45. The movement range is regulated so as not to obtain.

The bottom frame 33 has a triangular relay plate 28 (FIGS. 11 and 12) integrated with the bottom frame 33 projecting upward at the rear portion. 28, an upper rear support shaft 41d '
A back bracket 36a of the back frame 36 is rotatably supported around the shaft. In addition, the first bracket 4
An upper link arm 41b 'is rotatably supported on the upper part of the upper part 1 so as to be rotatable around an upper front support shaft 41a'. The distal end of the upper link arm 41b 'and the lower end of the back frame 36 are connected so as to be relatively rotatable around an intermediate shaft 410d extending in the width direction. Therefore, when a downward force is applied to the back frame 36, the force is transmitted to the bottom frame 33 via the upper rear support shaft 41 d ′ and the relay plate 28, whereby the bottom frame 33 rotates around the connection shaft 239. It is designed to rotate.

A lower front support shaft 41a "extending in the width direction is provided below the first bracket 41, and the lower link arm 41 is rotatable about the lower front support shaft 41a".
c 'is provided. The right upper portion of the lower link arm 41c 'and the right lower portion of the relay plate 28 are connected so as to be relatively rotatable around a lower rear support shaft 41d ".

As a result, the back bracket 36a between the upper rear support shaft 41d 'and the intermediate shaft 410d, and the intermediate shaft 410d and the upper front Support shaft 41
a ', the upper link arm 41b' and the upper front support shaft 41
A first bracket 41 between a ′ and the lower front support shaft 41a ″ and a lower link arm 41c ′ between the lower front support shaft 41a ″ and the lower rear support shaft 41d ″ form a pentagonal link structure.

Then, each of the link arms (the back bracket 3 between the upper rear support shaft 41d 'and the intermediate shaft 410d) is used.
6a), the distance between the link shafts (upper rear support shafts 41d ', etc.) is appropriately set, and when a downward force is applied to the back frame 36, the bottom movement is caused by the link movement of the pentagonal link structure. As the frame 33 moves forward, the seat angle (the tilt angle of the back frame 36 with respect to the vertical plane) of the back frame 36 gradually decreases as it descends.

The other structure of the seat body 3a in this embodiment, the table support 5 and the table 6
Is similar to that of the previous embodiment.

Therefore, according to the seat body 3a of this embodiment, the height of the seat back 34 is automatically adjusted in conjunction with the seat angle, that is, when the seat angle is small (see FIG. 12). In (a)), the height position of the seat back 34 is high, and when the seat angle is large ((b) in FIG. 12), the height position of the seat back 34 is automatically adjusted to be low, and the seat back 34 is automatically adjusted. When the seat 34 is set in the reclining posture with a large sitting angle, the seat bottom 31 advances, so that interference between the lower portion of the seat back 34 and the rear portion of the seat bottom 31 can be avoided, and the total length of the seat body 3a By increasing the dimension, the seat 1 set in the reclining posture can be used more comfortably.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above embodiment, the table support arm 51 is attached to the second bracket 42 via the link arm 53, but the present invention is not limited to this. Table support arm 51
The second horizontal shaft 54 may be directly supported by the second bracket 42. Even this way, seat back 3
Since the table support arm 51 can be rotated around the second horizontal axis 54 independently of the elevation of the table 4, the height position of the table 6 does not change even if the height position of the seat back 34 is changed. . However, in this case, the table 6
When the seat back 34 is moved up and down while being stored on the back of the seat back 34, the back of the seat back 34 and the table 6 come into sliding contact with each other. You need to do that.

(2) In the above embodiment, the horizontally long hole 44b is an arcuate hole. However, the horizontally long hole 44b is not limited to an arcuate hole, but may be a linear long hole. It may be a hole along a predetermined curve. Depending on the shape of the horizontally long hole 44b, the height position of the table 6 in the horizontal posture can be set variously.

[0086]

According to the seat table structure of the first aspect, while the first holding means for holding the seat back so as to be able to move up and down is provided, the second holding means for holding the table support arm so as to be able to change the posture is provided. The second holding means is configured such that the height position of the table set in a horizontal posture by an operation independent of the first holding means becomes constant independently of the elevation of the seat back. Therefore, the height of the seat back is freely set by the operation of the first holding means, and the table is stored on the back of the seat back by setting the table support arm in the upright posture. At the same time, by setting the table support arm to the inclined posture by the operation of the second holding means and setting the table to the horizontal posture, the occupant of the rear seat can It is possible to use the table.

The height of the table in the horizontal position can always be set at the same height without being affected by the fluctuation of the vertical position of the seat back, so that the occupant of the front seat can adjust the height of the seat back. Each time the position is adjusted, the inconvenience that the table height position is changed and the table cannot be used with ease for meals, etc. is resolved, and the table is configured so that the seat can be used more comfortably. The seat can be used with care and is effective in achieving a more comfortable seat.

According to the seat table structure of the second aspect of the present invention, the second holding means is interlocked with the first holding means in a state where the table support arm is stored on the back side of the seat back. When the table is stored on the back of the seat back, the table moves up and down in accordance with the elevation of the seat back by the interlocking operation of the second holding means with the first holding means, since the table is stored on the back of the seat back. A sliding state does not occur between the stored table and the back surface of the seat back, so that the seat back can be easily moved up and down and the stored state of the table can be stabilized.

According to the seat table structure of the third aspect of the present invention, the first holding means is formed by the quadrilateral link structure provided between the frame and the seat back. The seatback angle of the seat back can be changed while the relative positional relationship with the seat back is maintained substantially constant.

According to the seat table structure of the present invention, the first holding means is formed by the pentagonal link structure provided between the frame and the seat back. The link structure has a greater degree of freedom in shape deformation than the quadrilateral link structure. Therefore, by increasing the seat back angle, the seat bottom can be advanced more than the seat back. By this, in the state where the seat back has its sitting angle increased, that is, the seat is set in the reclining posture, the seat has a slightly longer overall length than when it is set in the sitting posture, The seat can be used more comfortably.

According to the seat table structure of the fifth aspect of the present invention, the second holding means includes a bracket erected on the frame and a base end rotatable about the first horizontal axis by the bracket. A link arm rotatably supported by the table support arm at a distal end thereof so as to be rotatable around a second horizontal axis, and a guide shaft extending outwardly protruding from a lower end of the table support arm. The bracket is provided with a guide elongated hole for guiding the guide shaft, and the guide elongated hole is vertically elongated so as to correspond to the elevation of the seat back. Since the table consists of a horizontally elongated hole that extends forward from the lower end, the seat back is moved up and down while the table is stored in the back of the seat back, so that it can be moved up and down with the vertical movement of the seat back. It can be. Therefore, when the table cannot be moved up and down, avoiding the inconvenience of rubbing between the seat back and the table when the seat back is moved up and down, which hinders smooth vertical movement of the seat back. Can be.

When the table accommodated in the back of the seat back is changed to the horizontal posture in the upright posture, only the table support arm is lowered until the guide shaft reaches the lower end of the vertically long hole. By pulling the upper end of the table rearward, the table support arm rotates around the first horizontal axis while the guide shaft is guided by the horizontally long hole, whereby the table can be pulled rearward from the seat back. In this state, by rotating the table rearward around the second horizontal axis, the table can be brought into a horizontal posture with the table being pulled rearward from the seat back.

As described above, the guide shaft is provided on the table supporting arm, and the bracket is provided with the elongated guide hole composed of the vertically elongated hole and the horizontally elongated hole for guiding the elevating and lowering of the guide shaft and the rotation about the second horizontal axis. In response to the vertical movement of the seat back, the table is pulled out from the back of the seat back with the guide shaft reaching the lower end of the vertically elongated hole while being guided by the vertically elongated hole and accompanying the seat back, and thereby, The pulled-out table can always be held at a fixed height position without being affected by the height position of the seat back.

According to the seat table structure of the sixth aspect of the present invention, the second holding means includes a bracket erected on the frame and a base end rotatable about the first horizontal axis by the bracket. And a link arm whose distal end is rotatably supported by the table support arm around a second horizontal axis, and whose base end is rotatably supported by a bracket around a third horizontal axis. And a second link arm substantially parallel to the link arm, the tip end of which is rotatably supported on the table support arm about a fourth horizontal axis. Since the link elongated hole extending in the longitudinal direction for guiding the shaft is formed, the table support arm and the bracket are connected to each other by the quadrilateral link structure formed by the link arm and the second link arm. The support arm Has become vertically movable in accordance with the link motion of the edge-shaped link structure, it can be raised and lowered following the lifting of the seat back.

The fourth horizontal axis is movable within the range of drilling the long link hole, so that the table support arm rotates around the second horizontal axis in the forward and reverse directions within the range of movement of the fourth horizontal axis. By the rotation, it is possible to rotate between a position stored in the seat back and a position pulled out from the seat back. Therefore, when the table support arm is stored on the back surface of the seat back, it can be moved up and down following the up and down movement of the seat back, and can be pulled out from the back surface of the seat back at an arbitrary position. In addition, the table support arm can be set at the lowest position in a state where the table support arm is pulled out, so that the height position of the table can be kept constant regardless of the height position of the seat back. it can. By adopting the quadrilateral link structure for the displacement of the table support arm, the table support arm can be raised and lowered more smoothly.

According to the seat table structure of the present invention, the urging means for urging the table support arm obliquely upward toward the seat back is provided.
A regulating means is provided on the rear side of the seat back to regulate the upward movement of the stored table support arm, so that the table supporting arm is directed in a direction in which the table supporting arm is always in contact with the seat back rear surface by the urging force of the urging means. In addition to being able to urge the table, the restricting means can restrict the upward movement of the table support arm in contact with the back of the seat back, and stabilize the storage state of the table on the back of the seat back. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a seat according to the present invention as viewed from the rear.

FIG. 2 is an assembled perspective view of the skeleton of the seat shown in FIG. 1;

FIG. 3 is a side view of the seat shown in FIG. 2;

FIG. 4 is an external view of the seat shown in FIG. 2 when viewed from the rear, and shows a state in which the table is stored on the back of the seat back.

5 is an external view of the seat shown in FIG. 2 as viewed from the rear, and shows a state where the table is pulled out from the back of the seat back.

FIGS. 6A to 6C are explanatory side views for explaining the operation of the table structure according to the first embodiment, and are for explaining the opening and closing operation of the table; FIGS.

FIGS. 7 (a) and 7 (b) are side views for explaining the operation of the table structure of the first embodiment, and are for explaining a table elevating operation interlocked with a seat back elevating operation. Things.

FIG. 8 is an exploded perspective view showing a second embodiment of the table structure.

FIG. 9 is an assembled perspective view of FIG. 8;

FIGS. 10A and 10B are explanatory side views of a seat for explaining the operation of the table structure according to the second embodiment; FIGS.

FIG. 11 is a perspective view showing another embodiment of the link structure according to the present invention, wherein (A) is an exploded perspective view and (B) is an assembled perspective view.

FIGS. 12A and 12B are explanatory views for explaining the operation of another embodiment of the present invention, wherein FIG. 12A shows a state in which the seat back is set to an upright posture, and FIG. 12B shows a state in which the seat back is set to an inclined posture. Each state is shown.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 seat 2 frame 3, 3a seat main body 31 seat bottom 33 bottom frame 34 seat back 4 bracket 41 first bracket 41b upper link arm (first holding means) 41c lower link arm (first holding means) 42 second bracket (Bracket body) 5 Table support 51 Table support arm 53 Link arm (second holding means) 54 Second horizontal axis 56 First horizontal axis 57 Guide axis (Fourth horizontal axis) 571 Third horizontal axis 6 Table 61 First 3 horizontal axis F floor

Claims (7)

[Claims] 1. A seat body comprising a frame disposed on a floor, a seat bottom attached to the frame, and a seat back provided upright at a rear portion of the seat bottom, and housed on the back side of the seat back. The table support arm is provided so that the posture can be changed between the upright posture and the inclined posture separated from the back side, and the table support arm is inclined at the upper end of the table support arm in the inclined posture. A seat table structure comprising a table provided so that the posture can be changed between a posture and a horizontal posture, and a height position of a rear portion of a seat bottom can be adjusted in conjunction with a seat back angle. And first holding means for holding the seat back so as to be able to move up and down so that the height position becomes lower as the seat angle becomes larger. On the other hand, second holding means for holding the table support arm so that the attitude can be changed is provided, and the second holding means is configured such that the height position of the table set in a horizontal attitude is independent of the elevation of the seat back. A table structure of the sheet, wherein the table structure is configured to be constant. 2. The apparatus according to claim 1, wherein the second holding means is configured to operate in conjunction with the first holding means in a state in which the table support arm is stored on the back side of the seat back. The table structure of the sheet according to claim 1, wherein: 3. The seat table according to claim 1, wherein said first holding means is formed by a quadrilateral link structure provided between said frame and said seat back. Construction. 4. The seat according to claim 1, wherein the first holding means is formed by a pentagonal link structure provided between the frame and the seat back. Table structure. 5. The second holding means includes a bracket erected on the frame, a base end side pivotally supported by the bracket so as to be rotatable around a first horizontal axis, and a tip end side supporting the table. A link arm rotatably supported on the arm so as to be rotatable about a second horizontal axis; and a guide shaft protruding from a lower end portion of the table support arm and extending outward. Is provided with a guide slot for guiding the guide shaft, the guide slot extends vertically so as to correspond to the elevation of the seat back, and extends forward from the lower end of the slot. The table structure for a seat according to any one of claims 1 to 4, wherein the table structure comprises a horizontally elongated hole extending. 6. The second holding means includes a bracket erected on the frame, a base end side pivotally supported by the bracket so as to be rotatable around a first horizontal axis, and a tip end side supporting the table. A link arm pivotally supported by the arm so as to be rotatable about a second horizontal axis; a base end side pivotally supported by the bracket so as to be rotatable about a third horizontal axis; A second link arm that is rotatably supported about four horizontal axes and that is substantially parallel to the link arm; a longitudinal direction that guides the fourth horizontal axis to the second link arm; The table structure for a seat according to any one of claims 1 to 4, wherein a link elongated hole extending in a direction is formed. 7. An urging means for urging the table support arm obliquely upward in the direction of the seat back is provided, while a rear surface of the seat back is provided above the stored table support arm. The table structure according to any one of claims 1 to 6, further comprising a regulating means for regulating movement of the sheet.