JP7449756B2 - seat equipment - Google Patents

Description

The present invention relates to a seat device in which the backrest of a seat is tiltable and a table is provided on the back side of the backrest.

2. Description of the Related Art Conventionally, seats for vehicles such as railway vehicles have been known to include a table on the back side of a reclining backrest for use by a person sitting in a rear seat. In this type of seat, the center of rotation around which the backrest reclines is generally fixed at a fixed position, and the table is supported so as to be able to rise and fall at the same center of rotation as the backrest via a support arm (for example, see Patent Document 1). ). Regardless of the tilt of the backrest, such a table could always be used by lying down in a fixed position and unfolded horizontally, and could be stored standing up along the back of the backrest.

In addition, when the seat is reclined, the seat moves in conjunction with the tilting of the backrest, thereby suppressing the amount of displacement of the tilted backrest toward the rear seat side and maintaining a comfortable seating surface that does not cause the hips to shift. A reclining mechanism has also been proposed (see, for example, Patent Document 2). In this type of seat, the center of rotation of the backrest moves with the displacement of the seat and is not fixed at a fixed position. In such a case, it was necessary to set the center position of the table to a virtual position and align it with the table storage position of the backrest.

That is, when storing the table along the back of the backrest, the table is held by being held by a table stopper provided on the back of the backrest. If the center of rotation of the table support arm is fixed at a fixed position, as the backrest is tilted, the relative position between the table stopper provided on the back of the backrest and the table in the storage position along the back of the backrest will change. Change. Therefore, the position of the table stopper is moved up and down in response to changes in the relative position of the table on the back of the backrest, thereby making it possible to unfold and store the table.

Japanese Patent Application Publication No. 11-225842 Unexamined Japanese Patent Publication No. 2018-90026

In the seat device equipped with the new type of reclining mechanism described above, in order to move the position of the table stopper up and down on the back of the backrest, a special structure such as a slide groove had to be separately provided in the movable part. Since this special structure is located in a position where a person seated in the rear seat operates the table when using the table, there is a risk that something may get caught during operation, and further improvements have been desired.

The present invention has been made by focusing on the problems of the conventional technology as described above, and provides a table that can be raised and folded against the back of the backrest even if the center of rotation of the backrest moves during reclining. The object is to provide a seat device that can be operated without problems.

In order to achieve the above-mentioned object, one aspect of the present invention includes:
In a seat device in which the backrest of the seat is tiltable and a table is provided on the back side of the backrest,
The table includes a table main body, and a support member that supports the table main body so as to be tiltable in a storage position along the back surface of the backrest or in a use position tilted backward from the back surface of the backrest,
The tilting fulcrum of the support member is provided separately from the center of rotation around which the backrest is tilted, and when the table main body is in the storage position, the tilting fulcrum of the support member follows the tilting of the backrest and tilts the table relative to the back of the backrest. It can be moved in the direction of keeping the storage position of the main unit constant ,
comprising a guide mechanism that supports a lower end portion of the support member having a tilting fulcrum movably with respect to a fixed side of the seat;
The guide mechanism is
a cam path provided on either the lower end of the support member and the base on the fixed side of the seat, the lower end of the support member following a trajectory along which the support member moves in accordance with the tilting of the backrest;
an engaging portion provided on the other of the lower end of the support member and the base, and movably engaged with the cam path to serve as a fulcrum for raising and lowering the support member;
The cam path includes one guide groove extending along the trajectory,
The engaging portion may include a pair of rollers that slidably engage with the guide groove while being spaced apart from each other .

According to the seat device according to the present invention, even if the center of rotation of the backrest moves during reclining, the table that is raised and folded relative to the back of the backrest can be operated without any problem.

FIG. 1 is a side view showing a seat device according to an embodiment of the present invention. FIG. 6 is a side view showing the internal structure of the seating device according to the embodiment of the present invention in (a) an upright posture and (b) a reclining posture when the table is in the storage position. FIG. 3 is a side view showing the internal structure of (a) an upright position and (b) a reclined position when the table is in the use position in the seat apparatus according to the embodiment of the present invention. In the table of the seating device according to the embodiment of the present invention, (a) storage position and (b) use position are perspective views seen from the rear. In the seating device according to the embodiment of the present invention, (a) an upright position and (b) a reclining position when the table is in the storage position are perspective views seen from the rear, respectively. FIG. 3 is a side view showing the internal structure and partial cross section of (a) an upright posture and (b) a reclining posture when the table is in the storage position in the seat device according to the embodiment of the present invention.

Hereinafter, representative embodiments of the present invention will be described based on the drawings.
1 to 6 illustrate one embodiment of the invention.
The seat device 10 according to the present embodiment includes a backrest 30 tiltably supported on the rear end side of the seat portion 20 of the seat, and a table 50 on the back side of the backrest 30. Although the type of seat is not particularly limited, the following description will be made using an example in which the present invention is applied to a one-person seat installed in a passenger compartment of a railway vehicle.

<Overview of seat device 10>
As shown in FIG. 1, in the seat device 10, a seat portion 20 and a backrest 30 are supported by a base 11 fixed on a floor surface, and a reclining movement in which the seat portion 20 moves in conjunction with the tilting of the backrest 30 is performed. configured to be possible. Here, the backrest 30 can be held in an upright position (see FIG. 2(a)) and a reclined position (see FIG. 2(b)).

On the back side of the backrest 30, a table 50 for use by a person seated in the rear seat is provided so as to be able to be raised and lowered. Sleeves 16 are provided on both sides of the seat 20 to cover the sides of the seat. The upper end side of the sleeve portion 16 is an armrest 17 that extends back and forth. Note that below the rear end of the seat portion 20, a leg rest 18 for use by a person seated in the rear seat is provided so as to be deployable.

<<About Base 11>>
As shown in FIG. 2, a base 11 that forms the base of the seat includes a pair of left and right base plates 12 that are erected to face each other on both sides of the seat. Both base plates 12 are made of, for example, a metal plate-like member processed into the shape shown in the figure, ribs are provided at appropriate locations to increase strength, and the base plates 12 are connected to each other at several locations via shafts (not shown). Note that the base 11 may be fixed directly on the floor surface, or may be fixed on the floor surface so that the direction of the seat can be changed via a known rotation mechanism.

A seat portion 20 and a backrest 30 are supported on the base 11 so as to be movable in conjunction with each other via a reclining mechanism to be described later. The reclining operation of the seat will be described in detail later, but when the backrest 30 is tilted from an upright position to a reclining position, the seat 20 also moves backward, with the rear end lowering more than the front end. It is configured as follows.

<<About the seat 20 and backrest 30>>
The seat portion 20 is formed by attaching a cushioning material to an underframe 21 forming a frame, and covering the surface including the seat surface with a skin material. The underframe 21 is constructed by arranging a pair of side members 22 parallel to the front-rear direction of the seat with an interval equivalent to the width of the seat 20, and connecting the front and rear ends of the side members 22 with a shaft 23 etc. to form a frame shape. It is configured.

The backrest 30 is formed by attaching a cushioning material to a back frame 31 and covering the surface including the backrest surface with a skin material. On the back of the backrest 30, a net-like pocket 35 (see FIG. 5) is attached below an area in which a table main body 51 of a table 50, which will be described later, is accommodated. The back frame 31 is constructed by connecting thin plates or horizontal bars between both ends of a frame member formed into an inverted U-shape. Approximately triangular support brackets 32 projecting forward are fixed midway toward both lower ends of the back frame 31.

Furthermore, mounting plates 24 extending diagonally rearward and upward are fixed to the rear end portions of both side members 22 of the underframe 21, respectively. A tip end of a support bracket 32 of a back frame 31 is rotatably connected to the upper part of the mounting plate 24 via a pivot 33 . The connection structure between the underframe 21 and the back frame 31 constitutes a part of the reclining mechanism described below. Here, the pivot shaft 33, which is the rotation center around which the backrest 30 is tilted, moves forward as the seat portion 20 is displaced. Note that the rotation center at which the backrest 30 is tilted does not mean a fixed rotation axis, but is a concept that refers to the origin of the tilt angle at each position in a series of displacements in which the backrest 30 is tilted. .

<About the reclining mechanism>
The seat device 10 includes a reclining mechanism that links the displacement of the seat portion 20 with the tilting of the backrest 30. The reclining mechanism of this embodiment mainly consists of a link mechanism, which connects the seat 20 and the base 11 in addition to the above-mentioned mounting plate 24 that connects the seat 20 and the backrest 30, the support bracket 32, and the pivot 33. It has a first link 41 and a second link 42.

The first link 41 has one end rotatably supported at a location near the front end of the base plate 12 of the base 11 via a pivot 41a, and the other end is pivoted at a location near the front end of the side member 22 of the underframe 21. It is rotatably supported via 41b. The second link 42 has one end that is rotatably supported on the base plate 12 at a location behind the pivot 41a via a pivot 42a, and the other end that is mounted on the side member 22 of the underframe 21 at a location behind the pivot 41b. It is rotatably supported via a pivot 42b. Here, the base plate 12 between the two pivots 41a and 42a serves as a third link, and the side member 22 between the two pivots 41b and 42b serves as a fourth link, forming a four-bar link mechanism.

By supporting the side members 22 of the underframe 21 on the base plate 12 of the base 11 using such a four-bar link mechanism, the backrest 30 can be moved from the upright position shown in FIG. 2(a) to the position shown in FIG. 2(b). When the seat portion 20 is displaced to the reclining position shown in FIG. 1, the seat portion 20 is displaced so that the rear end thereof is lowered than the front end while retreating rearward.

Further, a guide groove 13 for regulating movement of the back frame 31 is bored in the rear end side of the base plate 12 of the base 11. A roller 34 provided at the lower end of the back frame 31 is movably engaged with the guide groove 13 . The guide groove 13 extends from near the center of the base plate 12 toward the rear while curving obliquely upward. Note that the roller 34 may be a pin-shaped member that protrudes as a shaft.

Specifically, the guide groove 13 allows the backrest 30 to have a predetermined inclination angle at each position of the seat 20 between the upright position shown in FIG. 2(a) and the reclined position shown in FIG. 2(b). The degree of curvature is set as follows. That is, the relative position of the lower end portion (roller 34) of the back frame 31 with respect to the center of rotation (pivot 33) of the back frame 31 is regulated by the guide groove 13. Thereby, the inclination angle of the back frame 31 at each position of the seat portion 20 is set. Depending on the position or shape of the guide groove 13, the inclination angle of the backrest 30 corresponding to each position of the seat portion 20 can be set arbitrarily.

In addition, the seat device 10 includes a damper (not shown) that biases the underframe 21 of the seat portion 20 from the reclined position to the upright position. Further, the seat device 10 includes a locking mechanism (not shown) that can switch the seat 20 between a locked state and an unlocked state so that the seat 20 does not displace at a desired position. Note that the configurations of the damper and lock mechanism are common, so detailed explanations will be omitted.

<About table 50>
As shown in FIG. 1, the table 50 is used by a person sitting in the rear seat, and is provided on the back of the backrest 30. The table 50 includes a table main body 51, a support member 60 that supports the table main body 51 so as to be tiltable in a storage position along the back of the backrest 30 or a use position tilted backward from the back of the backrest 30; have. FIG. 2 shows a storage position in which the table main body 51 is stored along the back of the backrest 30, and FIG. 3 shows a use position in which the table main body 51 is tilted backward and unfolded substantially horizontally.

<<Table body 51>>
As shown in FIG. 4, the table main body 51 is formed of, for example, synthetic resin into a horizontally long rectangular plate shape. Two supporting members 60 form a set and are arranged parallel to each other so as to sandwich the table main body 51 from both sides. Each support member 60 is formed of, for example, a metal material into an arm shape extending in the vertical direction. As shown in FIG. 3, the table main body 51 is supported by the support member 60 so that the use position is always constant regardless of the tilt angle of the backrest 30.

As shown in FIG. 4, a pair of left and right connecting portions 52 are recessed on both sides of the base edge of the table body 51. As shown in FIG. An upper end portion of a support member 60 is rotatably connected to each connecting portion 52 by a hinge pin (not shown). Note that each connecting portion 52 is configured to be able to hold the table main body 51, which has been tilted down to the use position, in a substantially horizontally unfolded state using, for example, a cam or the like. Since such a configuration is common, detailed explanation will be omitted.

<<Support member 60>>
At the lower end of the support member 60, a pair of rollers 61a and 61b, which serve as a fulcrum for raising and lowering the support member 60, are provided. The rollers 61a, 61b are vertically spaced apart from each other and are provided so as to protrude laterally toward the same inner side. Here, each roller 61a, 61b corresponds to the "engaging part" of the present invention, and may be a pin-shaped member that protrudes as a shaft. In this way, the support member 60 is provided with a pivot point (rollers 61a, 61b) that is separate from the center of rotation (pivot 33) on which the backrest 30 is tilted.

Each roller 61a, 61b is movably engaged with a guide groove 14 in the base 11, respectively. That is, in addition to the guide groove 13 described above, the base plate 12 of the base 11 is also formed with a guide groove 14 in which the rollers 61a and 61b at the lower end of the support member 60 are movably engaged. Here, the guide groove 14 has almost the same shape as the guide groove 13 from the lower end to the middle along the rear side of the guide groove 13 on the rear end side of the base plate 12, and further has a shape approximately twice that of the guide groove 13 diagonally upward. It extends in a curved manner to the length of .

With respect to such a guide groove 14, each roller 61a, 61b, which is a fulcrum for raising and lowering the support member 60, is moved when the table main body 51 is in the storage position, as shown in FIGS. 2(a) and 2(b). When the table body 51 is tilted, the table body 51 is configured to be movable in a direction that keeps the storage position of the table body 51 constant relative to the back surface of the backrest 30, following the tilting of the backrest 30. Further, the support member 60 is restricted from rotating rearward at a predetermined angle of inclination (the use position shown in FIG. 3(a)).

The guide groove 14 corresponds to the "cam path" of the present invention along a locus along which the lower end of the support member 60 moves following the tilting of the backrest 30. Here, the guide groove 14 on the base 11 and the rollers 61a, 61b on the support member 60 constitute a guide mechanism that supports the lower end of the support member 60 so as to be movable toward the fixed side of the seat. Note that a reinforcing shaft 62 (see FIG. 4) is connected between the upper ends of both support members 60.

<<Table stopper 53>>
A table stopper 53 for holding the table main body 51 in the storage position is provided on the upper end side of the back of the backrest 30. The table stopper 53 is comprised of a locking pawl that is rotatable, for example, from a downward locking position to a sideways release position. As shown in FIG. 5, when the table body 51 is placed in the storage position along the back of the backrest 30 and the table stopper 53 is directed downward, the leading edge of the table body 51 is pressed by the table stopper 53 and placed in the storage position. Retained. On the other hand, the table stopper 53 is set so as to come off from the table main body 51 when the table stopper 53 is turned sideways.

<<Cover member 70>>
As shown in FIG. 5, a lower part of the back side of the backrest 30 covers between the lower ends of both support members 60, and extends from the upper end side to the inside of the back of the backrest 30 as the backrest 30 is tilted. A hidden cover member 70 is provided. The cover member 70 has a shape that follows the lower part of the back side of the backrest 30, and is formed in a horizontally long rectangular plate shape whose width almost matches the lower end portions of both the support members 60.

As shown in FIG. 6, the cover member 70 has a lower edge 71 attached to a shaft 15b connected between the rear ends of both base plates 12, and an upper edge 72 attached to a horizontal groove on the back of the backrest 30. It is inserted into the inside of the backrest 30 from 36 and is housed in a state where it can freely slide in the vertical direction. As shown in FIG. 5, the lateral groove 36 is arranged so as to be hidden along the lower end side of the pocket 35.

<<Damper 80>>
As shown in FIG. 4, the table 50 is equipped with a damper 80 that biases the support member 60 in the upright direction in which the table body 51 is in the storage position. The damper 80 is configured such that a piston rod 82 is inserted into and retracted from the cylinder body 81, and urges the piston rod 82 in a direction to protrude from the cylinder body 81. Here, the damper 80 corresponds to the "biasing means" of the present invention, and is composed of, for example, a gas spring or an air cylinder.

Specifically, a bracket 15c that protrudes upward is fixed approximately at the center of the shaft 15b connected between the rear ends of both base plates 12. The tip of the piston rod 82 is rotatably supported on the upper end of the bracket 15c. Furthermore, support pieces 63 that protrude forward are integrally provided at the lower ends of both support members 60 and above the engaging portions 61b, respectively. A clamp 64 is fixed between the front ends of both support pieces 63, with a portion closer to the center bent rearward in a stepped manner. A base end of the cylinder body 81 is rotatably supported approximately at the center of the clamp 64 .

Such a damper 80 constitutes a toggle mechanism, and as shown in FIG. 4(b), when the table main body 51 is in the use position, the damper 80 extends horizontally in the front-rear direction and becomes a toggle dead point. , the table main body 51 is held as it is in the use position by its own weight. On the other hand, when the table body 51 is raised upward from the use position, the damper 80 immediately passes the dead point of the toggle and moves in the upright direction where the table body 51 reaches the storage position, as shown in FIG. 4(a). energize. Note that when the table main body 51 is tilted to the use position, the table main body 51 and the supporting member 60 are pushed down against the biasing force of the damper 80.

<About the operation of the seat device 10>
Next, the operation of the seat device 10 according to this embodiment will be explained.
In the seat apparatus 10 shown in FIG. 1, the backrest 30 can be tilted from an upright position (imaginary line in FIG. 1) to a reclined position (solid line in FIG. 1) by operating the reclining mechanism by the seated person. . Further, as the backrest 30 is tilted, the seat portion 20 also moves downward to the rear so that its rear end is lower than its front end.

<<Operation of table 50>>
As shown in FIG. 2(a), when the backrest 30 is in the upright position, the seated person can naturally bend forward a little and sit in a comfortable posture, which may cause fatigue even when sitting for a long time. The sitting position becomes difficult. The table main body 51 on the back side of the upright backrest 30 is normally held in a storage position along the backside of the backrest 30 by a table stopper 53.

As shown in FIG. 3(a), when the table body 51 is unlocked by the table stopper 53 and the support member 60 is tilted backward together with the table body 51, each roller of the tilting fulcrum at the lower end of the support member 60 61a and 61b each move within the guide groove 14 in the base plate 12 from the upper end to the lower end and then stop. Thereby, the table main body 51 tilted backward is regulated to the use position.

In the use position of the table 50, the table main body 51 can be held in a horizontally expanded state between the upper ends of both support members 60. In this way, when tilting the table body 51 backward from the storage position to the use position, the operation is performed against the biasing force of the damper 80 shown in FIG. be done. On the other hand, when the table main body 51 is raised from the use position to the storage position, it can be easily returned with less force due to the biasing force of the damper 80.

Next, in order to recline the backrest 30, the seated person presses his or her back against the backrest 30 and tilts it while the locking mechanism (not shown) that holds the backrest 30 is unlocked. At this time, as the tilting angle of the backrest 30 increases, the weight of the seated person will naturally be applied to the backrest 30, so the backrest 30 can be tilted by simply tilting the body backward without applying excessive force. be able to.

As shown in FIG. 2(b), when the backrest 30 reclines to a reclining position, the seated person can obtain a more relaxed posture. As shown in FIGS. 2(a) to 2(b), when the backrest 30 is tilted, if the table main body 51 is in the storage position along the back of the backrest 30, the tilting fulcrum of the support member 60 Each roller 61a, 61b moves downward within the guide groove 14 in the base plate 12, following the tilting of the backrest 30.

As a result, even if the tilting support point (rollers 61a, 61b) of the support member 60 is not on the same axis as the rotation center (pivot 33) on which the backrest 30 is tilted, but is at a different position, the tilting angle of the backrest 30 can be adjusted. Regardless of the change, the storage position of the table main body 51 relative to the back of the backrest 30 can be kept constant. Here, the lower end of the support member 60 that moves up and down relative to the back of the backrest 30 is away from the position where a person seated in the rear seat operates the table 50, so it may cause some kind of hindrance to the operation. There's no fear.

If the support member 60 is provided at a fixed position, when the backrest 30 is tilted, the table stopper 53 on the backrest 30 side and the upper end of the table main body 51 in the storage position will be misaligned. . Therefore, in the reclining position, the table main body 51 cannot be held in the storage position. Note that, as shown in FIGS. 3(a) and 3(b), when the table 50 is in the use position, the table 50 is not affected even if the backrest 30 is changed to an upright position or a reclined position. Never.

<<Operation of cover member 70>>
As shown in FIG. 5, at the lower part of the back side of the backrest 30, an internal space in which the lower ends of both the support members 60 move up and down is covered by a cover member 70. Here, the lower end edge 71 of the cover member 70 is attached to the shaft 15b connected between the rear ends of both base plates 12, and is in a fixed position, and the upper end edge 72 is located further back than the horizontal groove 36 on the back surface of the backrest 30. It is inserted inside the stand 30 and is housed in a state where it can freely slide in the vertical direction.

As shown in FIG. 6(a), when the seat is in the upright position, the cover member 70 is exposed to the outside in a wide range from the lateral groove 36 of the backrest 30, and the cover member 70 is exposed to the outside between the lower ends of both support members 60. Conceal the structure. On the other hand, as shown in FIG. 6(b), when the seat is in the reclining position, most of the cover member 70 except for the lower edge 71 is stored inside the backrest 30 from the horizontal groove 36 of the backrest 30. The state will be as follows. In this way, no matter which state the seat is in, the area between the lower ends of both support members 60 is covered by the cover member 70, and there is no fear that the toes or the like will be caught in the interior space.

＜＜Seat reclining operation＞＞
In this seat device 10, when the backrest 30 is tilted, the seat portion 20 is moved backward by the reclining mechanism so that the rear end side is lowered lower than the front end. As shown in FIG. 2, the tilting of the back frame 31 is limited by the guide groove 13 of the base plate 12 in which the roller 34 at the lower end engages. Here, when the backrest 30 is tilted, the amount of tilting of the upper part of the backrest 30 toward the rear is suppressed as much as possible. Moreover, the displacement of the underframe 21 that interlocks with the back frame 31 is limited by the four-bar link mechanism.

That is, when the backrest 30 is tilted, the seat portion 20 moves backward and moves so that the rear end side is lowered than the front end. Therefore, even if the backrest 30 is placed in a reclining position, the seating surface of the seat portion 20 will only become slightly higher and the seated person will face upwards slightly, and the seated person's posture will be different from the comfortable upright sitting position. Almost the same posture is always maintained, and the comfort of not shifting your buttocks is maintained.

<Configuration and effects of the present invention>
Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above. The present invention derived from the embodiments described above will be described below.

First, the present invention
In the seat device 10 in which the backrest 30 of the seat is tiltable and the table 50 is provided on the back side of the backrest 30,
The table 50 includes a table main body 51 and a support member that supports the table main body 51 so that the table main body 51 can be raised and folded into a storage position along the back surface of the backrest 30 or a use position tilted backward from the back surface of the backrest 30. 60, and
The tilting fulcrum of the support member 60 is provided separately from the rotation center 33 on which the backrest 30 is tilted, and when the table main body 51 is in the storage position, the tilting fulcrum of the support member 60 follows the tilting of the backrest 30. The present invention is characterized in that the table main body 51 is movable in a direction in which the storage position of the table main body 51 relative to the back surface of the stand 30 is kept constant.

According to the seat device 10, the table main body 51 is supported by the support member 60 so that it can be raised and folded into a storage position along the back of the backrest 30 and a use position where it is tilted backward from the back of the backrest 30. . Here, the tilting fulcrum of the support member 60 is provided separately from the rotation center 33 around which the backrest 30 is tilted, so that the table main body 51 can be adjusted to the operating position by the support member 60 regardless of the tilting of the backrest 30. It can be supported so that it is always constant.

When the table main body 51 is in the storage position, the tilting support point of the support member 60 follows the tilting of the backrest 30 and moves in a direction to keep the storage position of the backrest 30 constant with respect to the back surface. That is, the relative positional shift of the table body 51 on the back of the backrest 30 due to reclining is eliminated by the movement of the support member 60 toward the tilting fulcrum, and the relative positional shift of the table body 51 on the back of the backrest 30 due to reclining is eliminated. The storage position does not undergo relative displacement (up and down movement) and is always kept constant.

Here, the lower end portion of the support member 60 that is displaced (up and down) relative to the back surface of the backrest 30 is away from a position where a person seated in the rear seat operates the table 50. That is, on the back of the backrest 30, at a position facing a person seated in the rear seat when operating the table 50, the table body 51 does not move at all, and there are no special slide grooves or the like for moving the table body 51. This eliminates the need for additional structures. Therefore, when operating the table 50, there is no fear of something getting caught in the special structure, and there is no risk of any operational problems.

Moreover, the present invention
A guide mechanism is provided for movably supporting the lower end portion of the support member 60, where the fulcrum is located, with respect to the fixed side of the seat,
The guide mechanism is
A cam path provided on either the lower end of the support member 60 and the base 11 on the fixed side of the seat, and along a trajectory along which the lower end of the support member 60 moves following the tilting of the backrest 30. 14 and
engaging portions 61a and 61b provided on the other of the lower end of the support member 60 and the base 11, movably engaging with the cam path 14 and serving as a fulcrum for raising and lowering the support member 60; It is characterized by having.

In this way, the cam path 14 and the engaging portions 61a and 61b, which have a simple configuration, can easily constitute a tilting support point for the support member 60, and this tilting support point can be used as the tilting support point of the backrest 30. It can be reliably guided in the desired direction to follow and move.

Moreover, the present invention
The cam path 14 consists of a guide groove extending along the trajectory,
The engaging portions 61a and 61b are characterized in that they are comprised of a pair of rollers that slidably engage with the guide groove while being spaced apart from each other.

In this way, the cam path 14 can be configured extremely easily from one guide groove, and since the engaging portions 61a and 61b are configured with a pair of rollers, it is possible to prevent the rollers from accidentally rotating in the middle of the guide groove. This allows for more reliable support.

Moreover, the present invention
A lower end (roller 34) located below the rotation center 33 of the backrest 30 is provided movably with respect to the base 11,
The present invention is characterized in that when the backrest 30 is tilted, its lower end (roller 34) moves forward.

In this way, by supporting the lower end portion (roller 34) of the backrest 30 and the engaging portions 61a, 61b of the support member 60, which are the pivot points, on the base 11, which is a common component, the structure can be further simplified. It becomes possible to simplify the process. Furthermore, when the backrest 30 is tilted, its lower end (roller 34) moves forward, reducing the amount of rearward tilting of the backrest 30 and encroaching on the seating space of the rear seat. can be suppressed.

Moreover, the present invention
At the lower part of the back side of the backrest 30, it covers between the lower ends of the pair of support members 60 disposed on both sides of the seat, and also covers the backside of the backrest 30 from the upper end side as the backrest 30 is tilted. It is characterized by comprising a cover member 70 that is hidden inside.

According to such a cover member 70, regardless of whether the backrest 30 is tilted, the internal structure including the area between the lower ends of both the supporting members 60 can be hidden, and there is no risk that the toes or the like may be caught in the internal space. .

Furthermore, the present invention
The present invention is characterized in that it includes a biasing means 80 that biases the support member 60 in the upright direction in which the table main body 51 is in the storage position.

According to such a biasing means 80, when tilting the table main body 51 backward from the storage position to the use position, the operation is performed against the biasing force of the damper 80, so there is no risk of sudden collapse and no impact will also be eased. On the other hand, when the table main body 51 is raised from the use position to the storage position, it can be easily returned with less force due to the biasing force of the damper 80.

Although the embodiments have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and any changes or additions that do not depart from the gist of the present invention are included in the present invention. For example, the shapes of the base 11, seat 20, backrest 30, table 50, etc. are not limited to those shown. Moreover, although the example of the seat for one person has been explained, it may be for two or three people.

Further, the specific displacement of the backrest 30 and the seat portion 20 due to the reclining of the seat is not limited to that shown in the embodiment. For example, in the embodiment, the rotation center of the backrest 30 moves with the displacement of the seat 20, but it does not necessarily have to move. Further, the seat portion 20 does not necessarily need to be linked with the tilting of the backrest 30.

Further, in the embodiment, in the guide mechanism for regulating the movement of the table main body 51, the guide groove 14 is provided in the base 11, and the rollers 61a, 61b are provided in the lower end of the support member 60. 61a and 61b may be provided on the base 11, while the guide groove 14 may be provided on the lower end of the support member 60. The same holds true for the guide groove 13 and rollers 34 that support the backrest 30.

Further, in the embodiment described above, in the guide mechanism for regulating the movement of the table main body 51, the cam path is formed by the guide groove 14, and the engagement portion at the lower end of the support member 60 is formed by the rollers 61a, 61b. For example, the cam path may be formed in the shape of a rail, and the engaging portion may be movably engaged with the rail.

INDUSTRIAL APPLICATION This invention can be widely utilized especially for the seat of the vehicle installed in the cabin of a railway vehicle, an aircraft, an automobile ship, etc.

DESCRIPTION OF SYMBOLS 10... Seat device 11... Base 12... Base plate 13... Guide groove 14... Guide groove 20... Seat part 21... Underframe 30... Backrest 31... Back frame 32... Support bracket 33... Pivot 41... First link 42... First 2 links 50...Table 51...Table body 60...Supporting member 61a, 61b...Roller 70...Cover member 80...Damper

Claims (4)

In a seat device in which the backrest of the seat is tiltable and a table is provided on the back side of the backrest,
The table includes a table main body, and a support member that supports the table main body so as to be tiltable in a storage position along the back surface of the backrest or in a use position tilted backward from the back surface of the backrest,
The tilting fulcrum of the support member is provided separately from the center of rotation around which the backrest is tilted, and when the table main body is in the storage position, the tilting fulcrum of the support member follows the tilting of the backrest and tilts the table relative to the back of the backrest. It can be moved in the direction of keeping the storage position of the main unit constant ,
comprising a guide mechanism that supports a lower end portion of the support member having a tilting fulcrum movably with respect to a fixed side of the seat;
The guide mechanism is
a cam path provided on either the lower end of the support member and the base on the fixed side of the seat, the lower end of the support member following a trajectory along which the support member moves in accordance with the tilting of the backrest;
an engaging portion provided on the other of the lower end of the support member and the base, and movably engaged with the cam path to serve as a fulcrum for raising and lowering the support member;
The cam path includes one guide groove extending along the trajectory,
The seat device is characterized in that the engaging portion includes a pair of rollers that slidably engage with the guide groove while being spaced apart from each other . A lower end portion located below the rotation center of the backrest is provided movably with respect to the base,
2. The seat device according to claim 1 , wherein when the backrest is tilted, a lower end thereof moves forward. A cover member is provided at the lower part of the back side of the backrest and covers between the lower ends of the pair of support members arranged on both sides of the seat, and hides inside the backside of the backrest from the upper end side as the backrest is tilted. The seat device according to claim 1 or 2, further comprising: 4. The seat apparatus according to claim 1, further comprising a biasing means for biasing the support member in an upright direction in which the table body is in a storage position.

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