JP7808640B2 - Seating device - Google Patents

Description

The present invention relates to a seating device that allows the seat state to be changed.

Conventionally, seats installed in railway vehicles, for example, include long seating types that seat two or more people, and are typically installed along both sides of the walls in the passenger compartment. Among these seating types, there are also known swivel seats that can be rotated around an axis at the center of the seat to change orientation between a long position, where the seat back is parallel to the wall, and a cross position, where the seat back is perpendicular to the wall.

For such rotating seats, as described in Patent Document 1, for example, a seating device has already been proposed that includes a sliding mechanism in addition to the seat rotation mechanism, and also includes a transmission mechanism that links these mechanisms together, so that the seat's trajectory (turning radius) does not interfere with the wall when the seat is rotated from a long position along the wall to a cross position.

In other words, in this seat device, the seat's rotation axis is positioned against the wall when in the long position to ensure a comfortable space by widening the aisle width between the seats on both sides of the passenger compartment, but when in the cross position, the seat's rotation axis is slid toward the aisle to prevent the seat from interfering with the wall. As a result, in order to prevent interference with the wall when in the long position, the seat device was unable to tilt the backrest, and was unable to be equipped with a reclining mechanism to improve seating comfort.

To solve these problems with seating devices, the applicant has proposed a new seating device that disables the reclining mechanism that tilts the backrest when the seat is in the extended position, as described in Patent Documents 2-4, for example. The seating devices described in Patent Documents 2 and 3 have a reclining mechanism operating unit located on the armrest at the top end of the sleeve section beside the seat, and this operating unit is locked so that it cannot be operated only when the seat is in the extended position, thereby disabling reclining.

The seat device described in Patent Document 4 also has a reclining mechanism operating unit on the armrest, but does not directly lock this operating unit. In this seat device, the power transmission system that transmits the operating force input to the operating unit to the reclining mechanism is blocked only when the seat is in the extended position, thereby disabling reclining.

Patent No. 3431772 Patent No. 7051253 Patent No. 7361676 Japanese Patent Application Laid-Open No. 2023-176226

In the seat devices described in the above-mentioned conventional patent documents 2 to 4, the mechanisms for restricting reclining do not directly affect the reclining mechanism itself, but rather disable operation of the operating unit or block the transmission of operating force in the power transmission system. With such mechanisms for indirectly restricting reclining, there is a risk that if a malfunction occurs in the operating unit or power transmission system, it will not be possible to restrict the operation of the reclining mechanism itself, which is the key issue.

In addition, in the seat devices described in Patent Documents 2 and 3, the operating unit for the reclining mechanism and its locking mechanism are located inside the armrest, making it difficult to arrange them in the limited space inside the armrest, or even if they could be arranged, the space inside the armrest would be encroached upon, making it impossible to arrange other components such as an in-arm table. Furthermore, in the seat device described in Patent Document 4, the mechanism for selectively disconnecting the power transmission system connecting the reclining mechanism and the operating unit is complex and requires a large number of parts, which could lead to high costs.

The present invention was developed in response to the problems inherent in conventional technology, as described above, and aims to provide a seating device that can directly and reliably restrict reclining only in specific situations where reclining is problematic, that can also meet the need for space-saving in the armrests, and that has a simple configuration that reduces the number of parts and thus costs.

In order to achieve the above-mentioned object, one aspect of the present invention is to provide a method for manufacturing a semiconductor device comprising:
A seat device equipped with a reclining mechanism that can change the state of the seat, including the orientation, and can fix the backrest at any tilt angle,
a reclining restriction unit that directly restricts the operation of the reclining mechanism itself to disable the backward tilting of the backrest when the seat is in a specific state ;
The reclining mechanism is provided with a damper that is bridged between the backrest and the fixed side of the seat and is extendable and contractable, and includes a locking means that can lock the extension and contraction at any position;
The reclining restriction section is provided with a lock pin that engages with and disengages from a movable member that releases the lock by the locking means, and the lock pin directly restricts the release operation of the lock by the locking means by engaging with the movable member when the seat is in the specific state .

The seating device of the present invention, when the seat position can be changed, can directly and reliably restrict reclining only when the seatback is in a specific position where reclining is an issue. It can also meet the need for space-saving in the armrests, and its simple configuration reduces the number of parts, thereby reducing costs.

1 is a perspective view showing an internal structure of a seat of a seat device according to a first embodiment of the present invention when the seat is in a cross state. FIG. 1 is a perspective view showing an internal structure of a seat of a seat device according to a first embodiment of the present invention when the seat is in a long state. FIG. 1 is a front view showing the internal structure of a seat of a seat device according to a first embodiment of the present invention when the seat is in a cross state. FIG. 1 is a side view showing the internal structure of a seat of a seat device according to a first embodiment of the present invention when the seat is in a long state. FIG. 3 is a perspective view showing a reclining restriction portion of the seat device according to the first embodiment of the present invention in a cross state. FIG. 3 is a perspective view showing a reclining restriction portion of the seat device according to the first embodiment of the present invention in a long state. FIG. 3 is a plan view showing a reclining restriction portion of the seat device according to the first embodiment of the present invention in a cross state. FIG. 3 is a plan view showing a reclining restriction portion of the seat device in the long state according to the first embodiment of the present invention. FIG. 1 is a side view showing a rotation operating portion of a seat device according to a first embodiment of the present invention in a cross state. FIG. 1 is a side view showing a rotation operating portion of a seat device according to a first embodiment of the present invention in a long state. 1 is a perspective view of a rotation lock mechanism of a seat device according to a first embodiment of the present invention, as viewed from above. FIG. 3 is a perspective view of a rotation lock mechanism of the seat device according to the first embodiment of the present invention, as viewed from below. FIG. 3A to 3C are explanatory diagrams showing a process of changing the state of a seat in the seat device according to the first embodiment of the present invention. FIG. 10 is a perspective view showing the internal structure of a seat of a seat device according to a second embodiment of the present invention when the seat is in a cross state. FIG. 10 is a perspective view showing the internal structure of a seat device according to a second embodiment of the present invention when the seat is in a long position. FIG. 10 is a perspective view showing a reclining restriction portion of a seat device according to a second embodiment of the present invention in a cross state. FIG. 10 is a perspective view showing a reclining restriction portion of a seat device according to a second embodiment of the present invention in a long state. 10 is a plan view showing a reclining restriction portion of a seat device according to a second embodiment of the present invention in a cross state. FIG. 10 is a plan view showing a reclining restriction portion of a seat device according to a second embodiment of the present invention in a long state. FIG.

Hereinafter, a representative embodiment of the present invention will be described with reference to the drawings.
1 to 13 show a first embodiment of the present invention, and FIGS. 14 to 19 show a second embodiment of the present invention. The seat device 10 according to various embodiments is capable of changing the state of the seat 1, including its orientation. Here, the state of the seat 1 is a concept that includes not only the orientation of the seat 1 due to rotation, but also changes in the front-to-back position of the seat 1. The type of seat 1 is not particularly limited, but the following description will be given taking as an example a case where the seat 1 is applied to a two-seater seat installed in a passenger compartment of a railway vehicle. Note that slight differences in the shapes of the same parts in each figure are merely design changes.

<Overview of the seat device 10 according to the first embodiment>
As shown in Fig. 1, the seat device 10 comprises a base 11 fixed to the floor, a movable base 20 supported on the base 11 so as to be movable forward and backward, and a seat frame 30 supported on the movable base 20 so as to be rotatable forward and backward on a substantially horizontal plane. The base 11 corresponds to the "fixed side of the seat 1" in the present invention, and the movable base 20 and the frame 30 correspond to the "movable side of the seat 1" in the present invention. The seat device 10 is placed on the floor near a wall (window) in a passenger compartment of a railway vehicle, and "W" in Fig. 13 indicates a part of the wall parallel to the direction of travel of the railway vehicle.

As shown in FIG. 1, the seat frame 30 of the seat 1 is rotatably supported on the movable base 20 via a rotation mechanism 40. The movable base 20 is supported on the base 11 via a slide mechanism 14 so that it can move back and forth together with the rotation mechanism 40. Furthermore, the seat device 10 is equipped with a linkage mechanism (not shown) for linking the rotation of the seat 1 by the rotation mechanism 40 with the movement of the seat 1 forward and backward by the slide mechanism 14.

<Seat 1>
As shown in Figure 13, the seat 1 is, for example, a two-seater, and is made up of a pair of left and right seat portions 2, 2 and backrests 3, 3 arranged side by side on both sides. As shown in Figure 1, the lower end of the backrest 3 is supported via a reclining mechanism 50 on the rear end of the underframe 30 that forms the frame of the seat portion 2 so that it can be tilted. In Figures 1 to 4, only one of the left and right internal frames of the backrest 3 is shown, and this back frame 310 is fitted with a cushion and covered with a skin material. On the other hand, the seat portion 2 is made up of a pair of left and right seat portions 2, and is fitted with a cushion and covered with a skin material on the underframe 30 that forms the frame of the entire seat.

As shown in Figure 1, a pair of left and right sleeves 4, 4 are provided on both sides of the seat 1, covering each seat portion 2 from the sides. The upper end of each sleeve 4 forms an armrest 5 that extends approximately horizontally from front to back. The armrest 5 is made by attaching a cushioned armrest to the upper end surface of the frame that forms the sleeve 4. A reclining operation unit 57 of a reclining mechanism 50 is provided at the front of the upper end of the sleeve 4. Furthermore, an in-arm table 6 that can be used by the seated person is stored inside the sleeve 4. The in-arm table 6 is configured so that it can be deployed outside by opening the armrest 5.

A support frame 313 is installed between the pair of left and right armrests 4, 4 of the seat 1, supporting the back frame 310 together with the armrests 4. The lower ends of both sides of the back frame 310 near the outside of the seat are tiltably supported by bearings 4a provided on the inside of the frame of the armrest 4, via a rotation axis 311 that serves as the tilt fulcrum for the entire backrest 3. On the other hand, the lower ends of both sides of the back frame 310 near the center of the seat are tiltably supported by bearing brackets 314 provided approximately in the center of the support frame 313, via the rotation axis 311 that also serves as the tilt fulcrum for the entire backrest 3.

<Seat 1 status>
As shown in Figure 13, the state of the seat 1 can be converted between a long state (Figure 13(a)) in which the seat back is approximately parallel to the wall W, and a cross state (Figures 13(c) and 13(d)) in which the seat back is approximately perpendicular to the wall W. Here, the "seat back" is synonymous with the back side of the backrest 3. The cross state includes a one-cross state (Figure 13(c)) in which the seat 1 faces the direction of travel of the vehicle, and a reverse-cross state (Figure 13(d)) in which the seat 1 faces the opposite direction to the direction of travel of the vehicle. Hereinafter, the one-cross state and the reverse-cross state will be collectively referred to as the cross state. The long state in this embodiment corresponds to the "specific state" of the seat 1 in the present invention. Note that the seat 1 is generally operated in the long state during peak times such as rush hour.

Figures 1 and 3 show the seat device 10 when the seat 1 is in the cross position. Figures 2 and 4 show the seat device 10 when the seat 1 is in the long position. As shown in Figure 13, if the long position of the seat 1 (Figure (a)) is taken as the original position and the rotation angle is 0 degrees, rotating the seat 1 90 degrees in one direction (counterclockwise in the figure) from the long position results in the one cross position (see Figure (c)), and further rotating the seat 1 180 degrees in one direction from the one cross position results in the reverse cross position (see Figure (d)). Note that Figure 13 (b) shows the state in which the rotation angle of the seat 1 is 60 degrees midway while rotating from the long position to the one cross position.

<Reclining mechanism 50>
1 and 2, the reclining mechanism 50 supports the backrest 3 so that it can be tilted within a predetermined angle range relative to the seat 2 (frame 30), and can fix the backrest 3 at any tilt angle. A reclining mechanism 50 is provided independently for each backrest 3 (only one is shown in FIG. 1, etc.), and the reclining mechanisms 50 are arranged parallel to each other and close to each other, for example, with the center line of the frame 30 in the left-right direction between them.

The reclining mechanism 50 is composed of a damper 51, such as a gas spring. As shown in FIG. 1, the damper 51 that makes up the reclining mechanism 50 specifically consists of a cylindrical cylinder body 52 filled with gas, and a piston rod 53 that is fixed to a piston (not shown) slidably inserted into the cylinder body 52 and protrudes telescopically outside the cylinder body 52. Note that dampers 51 equipped with a locking mechanism (described below) are sometimes referred to as seat locks or free locks.

The damper 51 extends in the front-to-rear direction on the underframe 30 and is bridged between the backrest 3 (back frame 310) and the underframe 30. The rear end of the cylinder body 52 is connected to the lower end of the back frame 310 so that it can be pushed and pulled. More specifically, arm portions 312 that extend further downward than the rotation shaft 311 are integrally formed on the lower ends of both sides of the back frame 310 near the center of the seat, and the rear end of the cylinder body 52 is connected to the lower ends of the arm portions 312 so that it can be pushed and pulled.

Meanwhile, the tip of the piston rod 53, which extends and retracts from the front end of the cylinder body 52, is connected to a mounting bracket 55 fixed to a location near the front end of the upper surface of the underframe 20. In this way, the damper 51 is extendable while spanning between the seat back frame 310 and the fixed side of the seat, and the piston rod 53 is constantly urged in the direction of extension by the gas pressure inside the cylinder body 52. In other words, the damper 51 is set to apply a repulsive force in the direction of returning the backrest 3 to its most upright angle. The damper 51 also has a locking mechanism that can lock its extension and retraction at any position.

The locking mechanism of the damper 51 allows the backrest 3 to be fixed at any tilt angle. The locking mechanism consists, for example, of a valve mechanism installed inside the cylinder body 52 and a push pin 54 (see Figure 5) that protrudes from the end of the piston rod 53 to open and close the valve mechanism. When the push pin 54 is pushed into the cylinder body 52, gas pressure acts on the valve mechanism, unlocking the piston rod 53 and allowing it to protrude outward. On the other hand, when the pushing action of the push pin 54 is released, the extension and retraction of the piston rod 53 is locked at that position.

When the locking mechanism is released by operating the reclining operation unit 57 (described below), the piston rod 53 fits into the cylinder body 52, causing the backrest 3 to return to its most upright initial position. In this unlocked state, the occupant can lean their weight against the restoring force of the damper 51 and tilt the backrest 3 backward, adjusting and fixing the backrest 3 to any desired angle up to the most rearward reclining position.

As shown in Figure 5, a movable member 56 is swingably attached to the mounting bracket 55 at a position facing the tip of the push pin 54. The movable member 56 is biased in a direction that moves it away from the push pin 54, but is connected to a reclining operation cable 58 (see Figure 16), which will be described later. When the reclining operation cable 58 is pulled by operating the reclining operation unit 57, which will be described next, the movable member 56 swings against the biasing force and pushes in the push pin 54, thereby entering an unlocked state.

<Reclining operation unit 57>
As shown in Figure 1, the seat 1 is provided with a reclining operation unit 57 for releasing the locking mechanism of the reclining mechanism 50 from the fixed tilt angle of the backrest 3. The reclining operation unit 57 is provided, for example, on the left and right armrests 4 in correspondence with the reclining mechanism 50 of each backrest 3. Here, the reclining operation unit 57 is configured, for example, as a well-known operating lever.

The operating lever that constitutes the reclining operation unit 57 is rotatably mounted at the front upper end of the armrest 4, with its input end exposed and accessible for the seat occupant to place their finger. When the input end of this operating lever is pulled with a finger, the operating end on the opposite side of the rotation center rotates in the opposite direction. One end of a reclining operation cable 58 is connected to the operating end of the operating lever, which transmits the operating force input to the input end to the movable member 56 of the reclining mechanism 50.

The other end of the reclining operation cable 58 is extended and connected to the movable member 56. In other words, by pulling the operation lever, the movable member 56 is pulled against the biasing force via the reclining operation cable 58, pushing in the push pin 54 and unlocking the damper 51. Note that the operation lever that constitutes the reclining operation unit 57 is normally held in its initial position by being pulled by the reclining operation cable 58, etc.

<Reclining restriction unit 100>
1 and 2, the seat 1 is equipped with a reclining restriction unit 100 that directly restricts the operation of the reclining mechanism 50 itself to disable the backward tilting of the backrest 3 when the seat 1 is in the long position (specific position). The reclining restriction unit 100 is disposed beside the damper 51 on the underframe 30 in correspondence with the reclining mechanism 50 of each backrest 3. Note that the reclining restriction unit 100 is configured as a single unit, as will be described later, and can be retrofitted to an appropriate location on the underframe 30.

The reclining restriction unit 100 of this first embodiment directly restricts the contraction of the damper 51 when the seat 1 is in the long position. The reclining restriction unit 100 is configured to engage with the piston rod 53 of the damper 51 when the seat 1 is in the long position. Figures 5 and 7 show the reclining restriction unit 100 when the seat 1 is in the cross position, and Figures 6 and 8 show the reclining restriction unit 100 when the seat 1 is in the long position.

As shown in Figures 5 to 8, the reclining restriction unit 100 comprises a housing 101 that serves as the base of the unit, a link member 110 incorporated within the housing 101, a restriction member 120 connected to the link member 110 so that it can be pushed and pulled, and a reclining restriction cable 130 also connected to the link member 110. Here, the restriction member 120 corresponds to the "reclining restriction unit" of the present invention in the narrow sense, and is a main component of the reclining restriction unit 100.

The housing 101 is formed as a shallow, roughly square case in plan view. The link member 110 is made of a linearly extending flat plate, and its approximate center is pivoted horizontally on the bottom surface of the housing 101 via a pivot 113. The tip side of the reclining restriction cable 130 is connected to one of the input ends 111 of the link member 110 via a fixed pin 111a. The base end of the reclining restriction cable 130 extends to an engaged portion 77 on the rotation operation unit 70 side, which will be described later. When the seat 1 is in the long position, the reclining restriction cable 130 is pulled by the engaged portion 77, which will be described later, to rotate the link member 110.

Of the two ends of the link member 110, the other output end 112 side is bent so that it is one step higher than the reference plane of the link member 110. The rear end of the shaft 121 of the regulating member 120, described below, is connected to this one-step higher output end 112 via a pivot pin 112a. Here, the output end 112 side of the link member 110 is provided with a long hole 112b that allows the pivot pin 112a to move a predetermined amount of play in the longitudinal direction of the link member 110, and the link member 110 is connected so that rotation of the link member 110 can be converted into reciprocating movement in the axial direction of the regulating member 120. It is also recommended to provide similar play at the connection point of the fixing pin 111a to the input end 111 of the link member 110.

The restricting member 120 has a linearly extending shaft 121 and a restricting portion 122 integrally formed on the front end thereof, the restricting portion 122 having a generally C-shaped cross section and opening forward in a direction perpendicular to the axial direction of the shaft 121. The restricting member 120 is positioned so that the restricting portion 122 approaches or moves away from the side perpendicular to the piston rod 53 of the damper 51, and the rear end of the shaft 121 is connected to the output end 112 of the link member 110.

The restricting member 120 is supported so as to be able to move back and forth in the axial direction of the shaft 121 via a mounting bracket 123 that is approximately U-shaped in plan view and fixed to the bottom surface of the housing 101. A guide groove 121a (see Figure 5) is provided at the rear end of the shaft 121 to prevent interference with the rotational trajectory of the output end 112 of the link member 110. The restricting member 120 is pre-assembled to the housing 101 together with the mounting bracket 123, link member 110, etc., and the reclining restricting unit 100 is configured as a single unit.

As shown in Figures 5 and 7, when the restricting portion 122 of the restricting member 120 disengages from the piston rod 53 of the damper 51 and the middle of the piston rod 53 is not engaged with the open groove 122a of the restricting portion 122, the piston rod 53 can retract from that position into the cylinder body 52. When the damper 51 is thus able to retract, the backrest 3 can tilt backward.

On the other hand, as shown in Figures 6 and 8, when the restricting portion 122 of the restricting member 120 is close to the piston rod 53 of the damper 51 and the middle of the piston rod 53 is engaged with the open groove 122a of the restricting portion 122, the piston rod 53 cannot retract from that position into the cylinder body 52. With the contraction of the damper 51 directly restricted in this way, the backrest 3 cannot tilt backward.

When the seat 1 is in the cross position, as shown in Figures 5 and 7, the restricting member 120 is normally biased in the direction in which the restricting portion 122 disengages from the piston rod 53 by the biasing force of the spring member 124 attached to the shaft portion 121. However, when the seat 1 is converted to the cross position, the input end 111 of the link member 110 is pulled by the reclining restricting cable 130 and rotates, and as shown in Figures 6 and 8, the restricting member 120 is configured so that the restricting portion 122 engages with the piston rod 53 against the biasing force of the spring member 124.

<Step stand 11>
As shown in Figure 13, the stool 11 is fixed to the floor surface beside the wall W inside the passenger compartment. The stool 11 is configured by combining frame materials in the form of a long platform extending in a direction (front-to-rear direction) approximately perpendicular to the wall W. The top surface of the stool 11 is approximately horizontal, and this top surface is surrounded by both sides forming the long sides and a rear end portion forming the short side on the rear side (wall W side), but the front end side (aisle side) is open.

The base 11 is placed on the floor with its rear end positioned close to and approximately parallel to the wall W. That is, the base 11 is fixed so that both sides parallel to its longitudinal direction are approximately perpendicular to the wall W, and its front and rear ends parallel to its lateral direction are approximately parallel to the wall W. In addition to the slide mechanism 14 (described below), the top surface of the base 11 is provided with related parts such as stoppers that regulate the forward/backward movement range and rotation direction of the frame 30.

<Slide mechanism 14>
1 and 2, a movable platform 20 is attached to the upper surface of the base 11 via a slide mechanism 14 so as to be movable back and forth in a direction substantially perpendicular to the wall W. The slide mechanism 14 includes a pair of outer rails 14a (see FIG. 2) provided on the inside of both sides of the base 11. The pair of outer rails 14a (see FIG. 1) face each other in parallel along both long sides of the upper surface of the base 11, and a pair of inner rails 14b (see FIG. 1) provided on both sides of the movable platform 20 (described below) are slidably fitted into the inside of each outer rail 14a.

<Moveable stand 20>
1 and 2, the movable platform 20 is disposed substantially horizontally on the upper surface of the base 11 and is formed by combining frame members into a rectangular framework. The pair of inner rails 14b, 14b described above are provided on both ends of the long sides of the movable platform 20. This allows the movable platform 20 to slide forward and backward in a direction substantially perpendicular to the wall W. In addition, a rotation mechanism 40 that rotates the seat 1 around a rotation axis is provided approximately in the center of the movable platform 20.

<Frame 30>
1 and 2, the underframe 30 is a frame for the entire seat to which the seat 1 is attached and supported, and is supported on the movable base 20 via a rotation mechanism 40. The underframe 30 is made of, for example, a metal plate having a shape that matches the bottom surfaces of the two adjacent seat portions 2. In other words, the underframe 30 is formed in a generally rectangular shape that is long in the left-right direction. In addition, the rotation mechanism 40, motor 41, etc., which will be described below, are disposed on the underside of the underframe 30.

<Rotation mechanism 40>
As shown in Fig. 1, the rotation mechanism 40 supports the frame 30 on the movable base 20 so that the frame 30 can rotate forward and backward on a substantially horizontal plane. The rotation mechanism 40 is configured as a unit in which, for example, a pair of inner and outer ring-shaped turntables are combined with a bearing interposed between them so that they can rotate relative to each other in the circumferential direction. In the rotation mechanism 40, the outer turntable is fixed to the movable base 20, and the inner turntable is fixed to the frame 30.

The rotation axis around which the seat 1 rotates is the center line of the rotation mechanism 40, and in this embodiment, it has no physical substance. As shown in Figure 3, the rotation mechanism 40 is equipped with a motor 41, which serves as a power source. A reducer is attached to the motor 41, and the drive gear on its output shaft is rotatably engaged with a sprocket 42 centered on a rotation axis provided on the underframe 30. The rotation mechanism 40 can also be used to rotate the seat manually.

<Rotation lock mechanism 60>
The seat device 10 is equipped with a rotation lock mechanism 60 that prevents the frame 30 (seat 1) from rotating in each of the rotation positions of the long state, the one-cross state, and the reverse-cross state. The rotation lock mechanism 60 locks the frame 30 to prevent it from rotating relative to the base 11, and therefore the movable base 20 is also inevitably prevented from moving forward or backward relative to the base 11.

As shown in Figures 11 and 12, the rotation lock mechanism 60 includes a lock pin 61 that can extend and retract vertically from the base 11 side to the underframe 30, and locking holes 62a, 62b, and 62c that are provided in the underframe 30 and into which the lock pin 61 engages and disengages. There are a total of three locking holes 62a, 62b, and 62c provided on one long side of the approximately rectangular underframe 30 that runs along the back of the seat, and on both short sides that run along both sides of the seat.

The lock pin 61 is incorporated into the housing 60a, which forms a unit, and the housing 60a is fixed near the rear end on the top surface of the base 11. The lock pin 61 can extend and retract upward from the top surface of the base 11, and operates between a locked position where it protrudes upward and fits into the locking holes 62a, 62b, and 62c, and an unlocked position where it retracts downward and disengages from the locking holes 62a, 62b, and 62c.

When the seat 1 is converted into the long position, one cross position, or reverse cross position, the lock pin 61 fits into the matching locking holes 62a, 62b, and 62c on the underframe 30, preventing the seat 1 from rotating. In other words, when the seat 1 is in the long position, the lock pin 61 fits into the locking hole 62a on one long side of the underframe 30. In the one cross position, the lock pin 61 is inserted into and engages with the locking hole 62b on one short side of the underframe 30. In the reverse cross position, the lock pin 61 fits into the locking hole 62c on the other short side of the underframe 30.

As shown in Figures 11 and 12, the housing 60a incorporating the lock pin 61 is provided with a spring member (not shown) that constantly biases the lock pin 61 upward toward the locked position, and a link 60b that retracts the lock pin 61 downward toward the unlocked position against the biasing force of the spring member. Although not shown, the output end of a foot-operated rotation control cable 76 (see Figure 9) is connected to the link 60b.

The lock pin 61 is normally maintained in the locked position by the biasing force of a spring member, but when the link 60b is pulled by a rotation operation cable 76 (described below) or the like, it is configured to retract into the unlocked position against the biasing force of the spring member. As shown in Figure 9, the input end of the rotation operation cable 76 extends to the rotation operation unit 70 provided on the base 11 side. As described below, operation of the rotation operation unit 70 pulls the rotation operation cable 76 (see Figure 9), releasing the restriction of the rotation lock mechanism 60.

In addition, one end of a rotary operation cable for electric operation (not shown) is also connected to link 60b of rotation lock mechanism 60. The power source for pulling the rotary operation cable for electric operation is, for example, the motor 41 of rotation mechanism 40. That is, motor 41 is equipped with a clutch, and is configured so that by switching the clutch, it can be switched between rotating seat 1 using rotation mechanism 40 and retracting lock pin 61 to release the lock. Note that the configuration of the clutch for motor 41 is common, so a detailed explanation will be omitted.

In this embodiment, the rotation lock mechanism 60 is configured so that when the seat 1 is in the extended position, the restraint imposed by the rotation lock mechanism 60 cannot be released by foot operation on the rotation operating unit 70, but can only be released by electric rotation operation using the motor 41. The electric rotation operation here is performed by the train crew or station staff, and the foot operation is mainly performed by passengers.

<Rotation operation unit 70>
As shown in Figure 1, the seat 1 is provided with a rotation operation unit 70. The rotation operation unit 70 is used to release the restriction imposed by the lock pin 61 of the rotation lock mechanism 60. As shown in Figure 9, the rotation operation unit 70 is configured as a unit in which various parts such as a foot pedal 74 are incorporated into a single housing 71, and is fixed to, for example, the mounting part 22 (see Figure 3) hanging down from the front end side of the movable platform 20.

As shown in Figures 9 and 10, the rotary operation unit 70 includes a foot pedal 74 that is pivotally supported via a pivot 73 at the lower end of a support bracket 72 fixed to the front side of the housing 71. The tip end of the foot pedal 74 can pivot back and forth around the pivot 73, on which the base end is pivoted.

The foot pedal 74 swings between a use position (see Figure 9) in which the tip protrudes forward from the housing 71, and a storage position (see Figure 10) in which the tip retracts upward. The foot pedal 74 is normally biased to the use position in which it protrudes forward via a spring member 75. When the foot pedal 74 is in the use position, it can be depressed to release the restraint provided by the rotation lock mechanism 60. However, when the foot pedal 74 is in the storage position, it cannot be released from the restraint provided by the rotation lock mechanism 60.

The input end of a foot-operated rotation control cable 76, which extends to the rotation lock mechanism 60, is connected to the base end of the foot pedal 74 via a connector or the like. When the foot pedal 74 is pressed downward in the use position, the rotation control cable 76 is pulled, causing the lock pin 61 (see Figure 11) of the rotation lock mechanism 60 to retract downward, thereby releasing the locked state of the rotation lock mechanism 60.

A shaft-shaped engaged portion 77 is fixed to the base end of the foot pedal 74, protruding in both directions at a position eccentric to the pivot 73. The input end of the reclining restriction cable 130, which extends from the reclining restriction unit 100, is connected to the engaged portion 77 via a connector or the like. When the engaged portion 77 engages with the engaging portion 79 (described below), the reclining restriction cable 130 is pulled, causing the restriction member 120 of the reclining restriction unit 100 to protrude, directly restricting the operation of the reclining mechanism 50 itself.

<Rotational Operation Prevention Mechanism 78>
In addition, the rotation operation unit 70 is provided with a rotation operation preventing mechanism 78 that prevents the rotation operation unit 70 from releasing the restriction of the rotation lock mechanism 60. The rotation operation preventing mechanism 78 prevents the operation of the foot pedal 74 when the seat 1 is in the long position (specific position). As shown in Figures 9 and 10, the rotation operation preventing mechanism 78 is made up of an engaging portion 79 provided on the foot base 11 on the fixed side of the seat 1 and an engaged portion 77 of the rotation operation unit 70 on the movable side of the seat 1.

The engaging portion 79 is located at the front end of the bottom surface of the footrest 11 and is configured as a hook-shaped bracket that protrudes diagonally forward. Meanwhile, the engaged portion 77, as described above, is axially mounted at a position eccentric from the pivot 73 on the base end of the foot pedal 74. The engaged portion 77 is designed to engage with the engaging portion 79 when the seat 1 is in the long position (specific position). When the engaged portion 77 engages with the engaging portion 79, the foot pedal 74 is swung to the storage position against the biasing force of the spring member 75, disabling the release operation of the rotation operating unit 70. At the same time, the reclining restriction unit 100 described above disables the backward tilting movement of the backrest 3.

<Interlocking mechanism>
The seat device 10 also includes an interlocking mechanism (not shown) that interlocks the rotation and forward/backward movement of the seat 1 when the seat 1 is converted into the long state, one-cross state, or reverse-cross state so that the seat 1 does not interfere with the wall W. The interlocking mechanism is usually provided on the base 11 and the movable base 20.

When the seat 1 is rotated together with the frame 30, the interlocking mechanism converts the rotation of the frame 30 into linear motion and transmits it to the movable platform 20, moving the movable platform 20 together with the frame 30 in a linear direction toward or away from the wall W. While there are no particular limitations on the type of interlocking mechanism, specific examples include the inventions described in Patent Publication No. 6,549,634 and Patent Publication No. 6,932,469, both of which have been proposed by the present applicant.

<Function of the seat device 10>
The operation of the seat device 10 according to the first embodiment will be described below.
First, the operation of changing the state of the seat 1 will be described with reference to Figure 13. As shown in Figure 13(a), when the seat 1 is in the long position, the rotation mechanism 40 is at a position closest to the wall W, the back of the backrest 3 is approximately parallel to the wall W, and the rotation angle of the seat is 0 degrees. In this long position, the frame 30 of the seat 1 is constrained so as not to rotate relative to the movable base 20, and the movable base 20 is constrained so as not to slide relative to the base 11.

At this time, in the rotation lock mechanism 60, the lock pin 61 shown in Figure 11 is fitted into the locking hole 62a (see Figure 2) on one long side of the underframe 30. Here, the lock pin 61 protrudes from the base 11, which is the fixed side of the seat 1, so not only is the seat 1 unable to rotate, but it is also simultaneously unable to slide.

Furthermore, when the seat 1 is in the extended position, as shown in Figure 10, the rotation operation prevention mechanism 78 prevents the release operation of the rotation operation unit 70. That is, in the extended position, the engaging portion 79 on the foot stand 11 engages with the engaged portion 77 on the foot pedal 74 on the movable platform 20. This causes the foot pedal 74 to swing to the upright storage position against the biasing force of the spring member 75, and is restrained in that storage position.

As a result, when the seat 1 is in the extended position, the foot pedal 74 not only moves to a stowed position where it cannot be operated, but is also firmly held in the stowed position due to the engagement between the engaging portion 79 and the engaged portion 77. Therefore, in the extended position, the release operation of the rotation operating portion 70 is impossible. With this simple configuration, it is possible to reliably prevent the occupant from rotating the seat 1 in the extended position.

<<Conversion from long state to one cross state>>
13(a) to 13(c), in order to convert the seat 1 from the long position to the cross position (rotation angle 90 degrees), it is necessary to release the restriction on rotation imposed by the rotation lock mechanism 60. Here, the operation of releasing the lock pin 61 from the locking hole 62a cannot be performed by operating the foot pedal 74 as described above, but is performed electrically using the power of the motor 41.

In the long position shown in Figure 13(a), after the restraint by the rotation lock mechanism 60 is released, as shown in Figure 13(b), when the seat 1 is rotated in the forward direction (counterclockwise in Figure 13) by the motor 41, the seat 1 rotates forward due to an interlocking mechanism (not shown). In other words, the frame 30 rotates forward toward the aisle while rotating in the forward direction so as not to interfere with the wall W.

As shown in Figure 13(c), when the seat 1 reaches the one-cross position (rotation angle 90 degrees), the lock pin 61 of the rotation lock mechanism 60 in Figure 1 fits into the locking hole 62b on one short side of the underframe 30. This prevents the seat 1 from rotating in the one-cross position.

Furthermore, when the seat 1 is in the cross position, the rotation operation prevention mechanism 78 releases the restriction that prevents operation of the rotation operation unit 70. That is, in the cross position shown in Figure 9, the engaged portion 77 of the foot pedal 74 on the movable platform 20 does not engage with the engaging portion 79 on the foot platform 11, and is separated. Therefore, the foot pedal 74 is pushed forward into its use position by the biasing force of the spring member 75.

At this time, the occupant of seat 1 can release the restraint imposed by the rotation lock mechanism 60 by stepping on the foot pedal 74. That is, in Figure 9, when the foot pedal 74 is stepped on and rocked, the rotation operation cable 76 is pulled, causing the lock pin 61 (see Figure 11) to retract downward, releasing the locked state of the rotation lock mechanism 60. This allows the occupant to manually rotate the seat 1.

<<Conversion from one cross state to the other cross state>>
Furthermore, in the one-cross state shown in Figure 13(c), if the rotation lock mechanism 60 is released and the seat 1 is rotated in the opposite direction (clockwise in Figure 13), an interlocking mechanism (not shown) will cause the seat 1 to move backward or forward while rotating. Next, the seat 1 will be temporarily held in the forward position parallel to the long state, and will then rotate in the opposite direction without moving forward or backward.

As shown in Figure 13(d), when the seat 1 reaches the reverse cross position (rotation angle -90 degrees), the lock pin 61 of the rotation lock mechanism 60 engages with the locking hole 62c on the other short side of the underframe 30, once again restricting the underframe 30 from rotating. The seat 1 can be converted from the one-cross position to the reverse cross position not only by depressing the foot pedal 74, but also by electrically operating the motor 41. To return the seat 1 from the reverse cross position to the one-cross position and then from the one-cross position to the original long position, simply perform the reverse operations of the conversion from the long position to the one-cross position and from the one-cross position to the reverse cross position described above.

<<Restriction of Reclining Mechanism 50 by Reclining Restriction Unit 100>>
Next, we will explain how the reclining restriction unit 100 restricts the operation of the reclining mechanism 50 itself. As shown in Figure 1, when the seat 1 is in the cross position, the engaged portion 77 on the movable platform 20 is separated from the engaging portion 79 on the foot platform 11. Therefore, the engaged portion 77 is not displaced, and the reclining restriction cable 130 (see Figure 9) is not pulled and is in a released state. At this time, in the reclining restriction unit 100, as shown in Figure 5, the restricting portion 122 on the tip side of the restricting member 120 is disengaged from the piston rod 53 of the damper 51 due to the biasing force of the spring member 124.

In this way, when the restricting portion 122 of the restricting member 120 is disengaged from the piston rod 53 of the damper 51, the piston rod 53 is not prevented from retracting into the cylinder body 52, and the entire damper 51 contracts, allowing the backrest 3 to tilt backward. Therefore, when the reclining operation unit 57 is operated, the movable member 56, pulled by the reclining operation cable 58, pushes the push pin 54, unlocking the backrest 3 in the reclining mechanism 50 and allowing the seat occupant to tilt the backrest 3 to any angle.

On the other hand, as shown in Figure 2, when the seat 1 is converted to the long position, the engaged portion 77 on the movable base 20 engages with the engaging portion 79 on the base 11. Then, as shown in Figure 10, the engaged portion 77 is pushed and displaced in a direction that pulls the reclining restriction cable 130 against the biasing force of the spring member 75. The seat 1 is converted to the long position during peak times, such as rush hour.

As shown in Figure 6, displacement of the engaging portion 79 causes the link member 110 of the reclining restricting unit 100 to rotate in a direction that pushes out the restricting member 120 against the biasing force of the spring member 124. Therefore, the restricting portion 122 of the restricting member 120 engages midway with the piston rod 53 of the damper 51. When the restricting portion 122 of the restricting member 120 engages with the piston rod 53 of the damper 51 in this way, the piston rod 53 is prevented from retracting into the cylinder body 52, preventing the entire damper 51 from retracting, and disabling the backrest 3 from tilting backward.

At this time, when the reclining operation unit 57 is operated, the movable member 56, pulled by the reclining operation cable 58, presses the push pin 54, releasing the locking mechanism of the damper 51. However, the restricting member 120 directly restricts the contraction of the damper 51 itself, preventing the backrest from tilting backward. This reliably prevents the occupant from reclining the backrest 3 when the seat 1 is in the long position, preventing the backrest 3 from inadvertently tilting and interfering with the wall W.

When converting the seat 1 from the cross position to the long position, if the backrest 3 is in a backward tilted position, it is necessary to return the backrest 3 to an upright position. This operation can be performed by using an electrically operated reclining operation cable 58a (see Figure 16) to move the movable member 56, separate from the operation of the movable member 56 pushing in the push pin 54 via the reclining operation cable 58 connected to the reclining operation unit 57. This can also be achieved by using an electrically operated reclining operation cable 58a to move the movable member 56, similar to the electrically operated unlocking operation of the rotation lock mechanism 60 described above.

<Outline of seat device 10A according to the second embodiment>
14 to 19 show a seat device 10A according to a second embodiment.
The seat device 10A of this embodiment is basically the same as the seat device 10 of the first embodiment, but the configuration of the reclining restriction unit 100A is different from that of the reclining restriction unit 100 of the first embodiment. The following mainly describes the reclining restriction unit 100A in terms of differences from the first embodiment, and the same reference numerals are used for the same parts as in the first embodiment, and redundant description will be omitted.

The reclining restriction unit 100A of this second embodiment directly restricts the release of the lock by the locking mechanism of the damper 51 when the seat 1 is in the long position. The reclining restriction unit 100A is configured to engage with the movable member 56 of the damper 51 when the seat 1 is in the long position. Figures 16 and 18 show the reclining restriction unit 100A when the seat 1 is in the cross position, and Figures 17 and 19 show the reclining restriction unit 100A when the seat 1 is in the long position.

As shown in Figures 16 to 19, the reclining restriction unit 100A has a lock pin 140 instead of the restriction member 120 described above. The tip 142 of the body 141 of the lock pin 140 is formed with a small diameter, and a locking hole 56a is provided in the leg of the movable member 56, into which the tip 142 of the lock pin 140 engages and disengages. The lock pin 140 is supported on the bottom surface of the housing 101 via a mounting bracket 123 so that it can move back and forth in the axial direction. In addition, a guide groove 141a is provided on the rear end of the body 141 to prevent interference with the rotational trajectory of the output end 112 of the link member 110.

As shown in Figures 16 and 18, when the lock pin 140 is disengaged from the movable member 56 and the tip 142 is not engaged with the locking hole 56a, the movable member 56 can swing. In this state, the backrest 3 can be tilted backward using the reclining operation unit 57 as described above. On the other hand, as shown in Figures 17 and 19, when the lock pin 140 is close to the movable member 56 and the tip 142 is engaged with the locking hole 56a, the movable member 56 cannot swing, the damper cannot be unlocked, and the backrest 3 cannot be tilted backward.

When the seat 1 is in the cross position, as shown in Figure 18, the lock pin 140 is normally biased in the direction in which the tip 142 disengages from the locking hole 56a by the biasing force of the spring member 124 attached to the body 141. However, when the seat 1 is converted to the long position, the input end 111 of the link member 110 is pulled by the reclining restriction cable 130 and rotates, and as shown in Figure 19, the tip 142 of the lock pin 140 engages with the locking hole 56a against the biasing force of the spring member 124.

With the reclining restriction unit 100A of the second embodiment, when the seat 1 is in the long position, the lock pin 140 engages with the movable member 56, thereby reliably restricting the release of the lock in the locking means of the damper 51, regardless of the operation of the reclining operation unit 57 by the seat occupant.

<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 above-described embodiments. The present invention derived from the above-described embodiments will be described below.

First, the present invention provides a seat device 10, 10A that is capable of changing the state of the seat 1, including its orientation, and that is equipped with a reclining mechanism 50 that can fix the backrest 3 at any tilt angle,
The seat is characterized by the provision of reclining restriction sections 100, 100A which directly restrict the operation of the reclining mechanism 50 itself and disable the backward tilting of the backrest 3 when the seat 1 is in a specific state.

This configuration makes it possible to directly and reliably restrict the reclining of the backrest 3 only when the seat 1 is in a specific state where reclining is an issue, provided the state of the seat 1 is changeable. In other words, the reclining of the backrest 3 is not indirectly restricted by restricting the operating unit 57 that externally operates the reclining mechanism 50, or the power transmission system that transmits the operating force of this operating unit 57 to the reclining mechanism 50.

As a result, even if a malfunction occurs in the operating unit 57 or power transmission system of the reclining mechanism 50, the backward tilting (reclining) of the backrest 3 can be reliably restricted by directly restricting the operation of the reclining mechanism 50 itself. Furthermore, there is no need to separately install a locking mechanism or the like in the armrest 4 of the seat 1 to restrict the operation of the operating unit 57 located in that position, thereby meeting the demand for space-saving in the armrest 4. Furthermore, by directly restricting the operation of the reclining mechanism 50 itself, it is possible to simplify the configuration, reduce the number of parts, and lower costs.

In addition, in the present invention, the reclining mechanism 50 is bridged between the backrest 3 and the fixed side of the seat 1 and is extendable and retractable, and includes a damper 51 that allows the backrest 3 to tilt backward as it contracts.
The reclining restriction unit 100 is characterized in that it directly restricts the contraction of the damper 51 when the seat 1 is in the specific position.

With this configuration, the contraction of the damper 51 itself, which supports the backrest 3 so that it can recline, is directly restricted, making it possible to more reliably restrict the backward tilting of the backrest 3 with a simple configuration.

Alternatively, in the present invention, the reclining mechanism 50 is provided with a damper 51 that is bridged between the backrest 3 and the fixed side of the seat 1 and is extendable and retractable, and that is equipped with a locking means that can lock the extension and retraction at any position,
The reclining restriction unit 100A is characterized in that it directly restricts the unlocking operation of the locking means when the seat 1 is in the specific position.

With this configuration, the release operation of the locking means of the damper 51 itself, which supports the backrest 3 so that it can be reclined, is directly restricted, making it possible to more reliably restrict the backward tilting movement of the backrest 3 with a similarly simple configuration.

The present invention also provides a seat that includes a rotation mechanism 40 that rotates the seat 1 around a rotation axis;
a slide mechanism 14 for moving the seat 1 together with the rotation mechanism 40 back and forth from the fixed side;
The rotation mechanism 40 and the slide mechanism 14 are linked together to change the state of the seat 1 as follows:
A long state in which the back of seat 1 is approximately parallel to the wall,
The long state can be converted into a cross state in a direction substantially perpendicular to the long state and away from the wall,
The specific state of the seat 1 corresponds to the long state.

With this configuration, the seat device 10, 10A can be applied directly to the typical rotating seat-type seats installed in railway vehicles, as described in the above-mentioned embodiment. Furthermore, when the seat 1 is in the extended position, the back of the backrest 3 is approximately parallel to and close to the wall W, so as described above, it is necessary to limit the backward tilting movement of the backrest 3 using the reclining restriction unit 100, 100A.

The present invention also provides an engaging portion 79 provided on the fixed side of the seat 1,
an engaged portion (77) that is provided on the movable side of the seat (1) and that is displaceable by engaging with the engaging portion (79) when the seat (1) is in the specific state;
The engaged portion 77 and the reclining restriction portions 100, 100A are connected to each other, and as the engaged portion 77 is displaced, the reclining restriction portions 100, 100A directly restrict the operation of the reclining mechanism 50 itself.

With this configuration, the reclining restriction units 100, 100A can be operated due to the mechanical engagement between the engaging portion 79 and the engaged portion 77. With this simple configuration, the backrest 3 can be prevented from tilting backward only when the seat 1 is in the long position, a specific position, without using electric power.

Furthermore, the present invention provides a seat 1 having a fixed side, which is a footrest 11 fixed on the floor surface;
a movable base 20 attached to the base 11 via the slide mechanism 14 so as to be movable forward and backward, and having a seat frame 30 rotatably supported via the rotation mechanism 40, as a movable side of the seat 1;
The engaging portion 79 is provided on the base 11,
The engaged portion 77 is characterized by being provided on the moving table 20 .

This configuration allows the engaging portion 79 and the engaged portion 77 to be optimally laid out relative to the components within the minimum necessary components of the seat device 10, 10A. In particular, by providing the engaged portion 77 and the recline restricting portion 100, 100A on the underframe 30, the power transmission system is simplified, allowing for a compact overall configuration and arrangement.

Although the embodiments have been described above using drawings, the specific configuration is not limited to these embodiments, and modifications and additions that do not deviate from the gist of the present invention are also included in the present invention. For example, the shapes of the base 11, movable platform 20, and frame 30, as well as the specific configuration of the reclining restriction units 100, 100A, etc., are not limited to those shown in the drawings. Furthermore, the seat 1 is not limited to a two-seater, and the position of the seat 1 is not limited to the long position, one-cross position, or reverse-cross position.

Furthermore, while the reclining restriction units 100, 100A are provided separately to correspond to the reclining mechanisms 50 of each backrest 3, it is also possible to provide only one so that it operates simultaneously for the two reclining mechanisms 50 of a pair of left and right backrests 3, 3. Specifically, for example, the tip of the shaft 121 of the restriction member 120 can be branched into two, with restriction units 122 (or the tip 142 of the lock pin 140) corresponding to the reclining mechanisms 50 at each end.

The present invention can be widely used as a seating device for vehicles such as those installed in the passenger compartments of railway cars, airplanes, automobiles, and ships, as well as for theater, home, and office chairs.

DESCRIPTION OF SYMBOLS 10, 10A... Seat device 11... Leg rest 14... Slide mechanism 20... Moving base 30... Frame 40... Rotation mechanism 50... Reclining mechanism 57... Reclining operation unit 60... Rotation lock mechanism 70... Rotation operation unit 74... Foot pedal 77... Engaged portion 78... Rotation operation prevention mechanism 79... Engaging portion 100, 100A... Reclining restriction unit 110... Link member 120... Restriction member 130... Reclining restriction cable 140... Lock pin

Claims (4)

A seat device equipped with a reclining mechanism that can change the state of the seat, including the orientation, and can fix the backrest at any tilt angle,
a reclining restriction unit that directly restricts the operation of the reclining mechanism itself to disable the backward tilting of the backrest when the seat is in a specific state ;
The reclining mechanism is provided with a damper that is bridged between the backrest and the fixed side of the seat and is extendable and contractable, and includes a locking means that can lock the extension and contraction at any position;
The seat device is characterized in that the reclining restriction section includes a lock pin that engages with and disengages from a movable member that releases the locking by the locking means, and the lock pin directly restricts the release operation of the locking means by engaging with the movable member when the seat is in the specific state . a rotation mechanism that rotates the seat around a rotation axis;
a slide mechanism for moving the seat together with the rotation mechanism back and forth from the fixed side,
The rotation mechanism and the slide mechanism are interlocked to change the seat state.
The long state where the back of the seat is roughly parallel to the wall,
The long state can be converted into a cross state in a direction substantially perpendicular to the long state and away from the wall,
2. The seating apparatus according to claim 1 , wherein the particular state of the seat corresponds to the long state. An engagement portion provided on the fixed side of the seat;
an engaged portion that is provided on the movable side of the seat and that is displaceable by engaging with the engaging portion when the seat is in the specific state;
3. The seat device according to claim 2 , wherein the engaged portion and the reclining restricting portion are connected to each other, and the reclining restricting portion directly restricts the operation of the reclining mechanism itself in accordance with the displacement of the engaged portion. A base fixed on the floor as the fixed side of the seat;
a movable base attached to the base via the slide mechanism so as to be movable forward and backward, and having a seat frame rotatably supported via the rotation mechanism, as a movable side of the seat;
The engaging portion is provided on the base,
4. The seat device according to claim 3 , wherein the engaged portion is provided on the movable base.