Seating device

Abstract

To provide a seat device which can restrict reclining directly and reliably only in a specific state that reclining operation of a seat needs to be stopped.SOLUTION: A seat device 10 can change a state of a seat 1 and includes a reclining mechanism 50 which can fix a backrest 3 at an arbitrary reclining angle. The seat device 10 includes a reclining restriction part 100 which directly restricts operation of the reclining mechanism 50 itself to make the backrest 3 unable to recline backward when the seat 1 is in a specific state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a seating device capable of changing the state of a seat. [Background technology]

[0002] Conventionally, seats installed in railway vehicles, for example, include long seats for two or more people, and are usually installed along the walls on both sides of the passenger compartment. Among these seats, there is known a swivel seat 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.

[0003] 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 each mechanism, so that the seat's trajectory (radius of rotation) does not interfere with the wall when the seat is rotated from a long position along the wall to a cross position.

[0004] That is, in the seat device, in order to widen the aisle width between the seats on both sides in the passenger compartment as much as possible to ensure a comfortable space, the seat rotation axis is positioned against the wall in the long position, but in the cross position the seat rotation axis is slid toward the aisle so that the seat does not interfere with the wall. Therefore, in order to prevent interference with the wall in the long position, the seat device could not tilt the backrest, and it was not possible to provide a reclining mechanism to improve seating comfort.

[0005] In order to solve the problems of the seat device, the applicant of the present application has proposed a new seat device that disables the reclining of the backrest by the reclining mechanism when the seat is in the extended position, as described in Patent Documents 2 to 4. The seat devices described in Patent Documents 2 and 3 have an operating unit for the reclining mechanism 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 the reclining.

[0006] 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 cut off to prevent transmission only when the seat is in the extended position, thereby disabling reclining. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 3431772 [Patent Document 2] Patent No. 7051253 [Patent Document 3] Patent No. 7361676 [Patent Document 4] Japanese Patent Application Publication No. 2023-176226 Summary of the Invention [Problem to be solved by the invention]

[0008] 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 transmission of the operating force in the power transmission system. With these types of mechanisms that indirectly restrict reclining, there is a risk that if a malfunction occurs in the operating unit or the power transmission system, it will not be possible to restrict the operation of the reclining mechanism itself, which is the key.

[0009] In addition, in the seat devices described in Patent Documents 2 and 3, the operating unit of the reclining mechanism and its locking mechanism are provided inside the armrest, making it difficult to arrange them in the limited space inside the armrest, or even if it were possible to arrange them, 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 has a large number of parts, which could lead to high costs.

[0010] The present invention was made in response to the problems of the conventional technology described above, and aims to provide a seat device that can directly and reliably restrict reclining only in specific situations where reclining operation is problematic, can meet the demand for space saving in the armrests, and has a simple structure that reduces the number of parts and thus reduces costs. [Means for solving the problem]

[0011] 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, The seat includes a reclining restriction unit that directly restricts the operation of the reclining mechanism itself when the seat is in a specific position, thereby disabling the backrest from tilting backward. 、 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 unit 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. It is characterized by: [Effects of the Invention]

[0012] With the seat device of the present invention, when the seat state can be changed, it is possible to directly and reliably restrict reclining only when the seat is in a specific state where reclining of the backrest is an issue, and it is also possible to meet the demand for space saving in the sleeve area, and the simple configuration allows for a reduction in the number of parts and therefore a reduction in costs. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective 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. [Figure 2] 1 is a perspective 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. [Figure 3] 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. [Figure 4] 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. [Figure 5] 1 is a perspective view showing a reclining restriction portion of a seat device according to a first embodiment of the present invention in a cross state. [Figure 6] 1 is a perspective view showing a reclining restriction portion of a seat device according to a first embodiment of the present invention in a long state. [Figure 7] 1 is a plan view showing a reclining restriction portion of a seat device according to a first embodiment of the present invention in a cross state. [Figure 8] 1 is a plan view showing a reclining restriction portion of a seat device according to a first embodiment of the present invention in a long state. [Figure 9] 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. [Figure 10] 1 is a side view showing a rotation operating portion of a seat device according to a first embodiment of the present invention in an extended state. [Figure 11] 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. [Figure 12] 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 below. [Figure 13] 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. [Figure 14]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. [Figure 15] 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. [Figure 16] 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. [Figure 17] 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. [Figure 18] 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. [Figure 19] 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. DETAILED DESCRIPTION OF THE INVENTION

[0014] 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 the orientation of the seat 1. 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. Furthermore, 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 the passenger compartment of a railway vehicle. Note that slight differences in shape of the same parts in each figure are merely design changes.

[0015] <Outline 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.

[0016] 1, the 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 the entire rotating mechanism 40 can move back and forth. Furthermore, the seat device 10 is provided with an interlocking mechanism (not shown) for interlocking the rotation of the seat 1 by the rotation mechanism 40 with the advancement and retreat of the seat 1 by the slide mechanism 14.

[0017] <Seat 1> As shown in Fig. 13, 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 Fig. 1, the lower end of backrest 3 is supported via a reclining mechanism 50 on the rear end of underframe 30, which forms the frame of seat portion 2, so that it can be tilted. In Figs. 1 to 4, only one of the left and right internal frames of backrest 3 is shown, and this back frame 310 is fitted with a cushion and covered with a skin material. Meanwhile, 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 underframe 30, which forms the frame of the entire seat.

[0018] As shown in FIG. 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 forward and backward. The armrest 5 is formed 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 outward by opening the armrest 5.

[0019] Furthermore, a support frame 313 is installed between a pair of left and right armrests 4, 4 of the seat 1 to support the back frame 310 together with the armrests 4. The lower ends of both sides of the back frame 310 that are closer to the outside of the seat are tiltably supported by bearings 4a provided on the inside of the frames of the armrests 4 via rotational shafts 311 that serve as the tilting fulcrum for the entire backrest 3. On the other hand, the lower ends of both sides of the back frame 310 that are closer to the center of the seat are tiltably supported by bearing brackets 314 provided approximately in the center of the support frame 313 via rotational shafts 311 that also serve as the tilting fulcrum for the entire backrest 3.

[0020] <Seat 1 status> As shown in FIG. 13, the state of the seat 1 can be changed between a long state (FIG. 13(a)) in which the seat back is approximately parallel to the wall W, and a cross state (FIGS. 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 (FIG. 13(c)) in which the seat 1 faces the direction of travel of the vehicle, and a reverse-cross state (FIG. 13(d)) in which the seat 1 faces the opposite direction to the direction of travel of the vehicle. Hereinafter, when referring collectively to the one-cross state and the reverse-cross state, they will be simply 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.

[0021] Figures 1 and 3 show the seat device 10 when the seat 1 is in the cross state. Figures 2 and 4 show the seat device 10 when the seat 1 is in the long state. As shown in Figure 13, if the long state of the seat 1 (Figure (a)) is taken as the original position and the rotation angle is 0 degrees, rotating the seat 1 from the long state in one direction (counterclockwise in the figure) by 90 degrees results in the one cross state (see Figure (c)), and further rotating the seat 1 from the one cross state in one direction by 180 degrees results in the reverse cross state (see Figure (d)). Note that Figure 13 (b) shows the state in which the rotation angle of the seat 1 is 60 degrees midway when rotating from the long state to the one cross state.

[0022] <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 they 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.

[0023] The reclining mechanism 50 is composed of a damper 51, such as a gas spring. As shown in Fig. 1, the damper 51 constituting the reclining mechanism 50 specifically comprises a cylindrical cylinder body 52 filled with gas, and a piston rod 53 fixed to a piston (not shown) slidably inserted into the cylinder body 52 and extending and contracting outside the cylinder body 52. ​​Note that among the dampers 51, those equipped with a locking means (described later) are sometimes called "seat locks" or "free locks" as product names.

[0024] The damper 51 is extended 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 as to be able to be pushed and pulled. More specifically, arm portions 312 extending further downward than the rotation shaft 311 are integrally provided at 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 as to be able to be pushed and pulled.

[0025] Meanwhile, the tip of the piston rod 53, which protrudes 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 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 means that can lock its extension and contraction at any position.

[0026] The backrest 3 can be fixed at any tilt angle by the locking means of the damper 51. The locking means consists, for example, of a valve mechanism provided in 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 causing 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.

[0027] When the locking by the locking means is released by operating the reclining operation part 57, which will be described later, the backrest 3 returns to its most upright initial position due to the biasing force of the piston rod 53 settling into the cylinder body 52. ​​In this unlocked state, the seated person can lean their weight against the restoring force of the damper 51 and tilt the backrest 3, and the backrest 3 can be adjusted and fixed to any angle up to the most backward reclining position.

[0028] As shown in Figure 5, movable member 56 is attached to mounting bracket 55 so as to be able to swing at a position facing the tip of push pin 54. Movable member 56 is biased in a direction to move away from push pin 54, but is connected to reclining operation cable 58 (see Figure 16), which will be described later. When reclining operation cable 58 is pulled by operating reclining operation unit 57, which will be described next, movable member 56 swings against the biasing force and pushes in push pin 54, thereby entering the unlocked state.

[0029] <Reclining control unit 57> As shown in Figure 1, the seat 1 is provided with a reclining operation unit 57 for releasing the fixed tilt angle of the backrest 3 by the locking means of the reclining mechanism 50. 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.

[0030] The operating lever that constitutes the reclining operating unit 57 is rotatably mounted at the front upper end of the armrest 4 with its input end exposed, where the seat occupant places 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 operating cable 58 is connected to the operating end of the operating lever to transmit the operating force input to the input end to the movable member 56 of the reclining mechanism 50.

[0031] The other end of the reclining operation cable 58 is extended and connected to the movable member 56. That is, by pulling the operation lever, the movable member 56 is pulled against the biasing force via the reclining operation cable 58, and the push pin 54 is pushed in, thereby releasing the damper 51 from the locked state. 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 or the like.

[0032] <Reclining restriction unit 100> As shown in Figures 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.

[0033] The reclining restriction unit 100 of the 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.

[0034] 5 to 8, the reclining restriction unit 100 includes 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.

[0035] The housing 101 is formed like a shallow, roughly square case in a plan view. The link member 110 is made of a linearly extending flat plate, and its approximate center is pivotally supported on the bottom surface of the housing 101 via a pivot 113 so as to be rotatable in the horizontal direction. The tip side of the reclining restriction cable 130 is connected to one input end 111 of the two ends of the link member 110 via a fixing pin 111a. The base end side of the reclining restriction cable 130 extends to an engaged portion 77 on the side of the rotation operation unit 70, which will be described later. When the seat 1 is in the extended position, the reclining restriction cable 130 is pulled by the engaged portion 77, which will be described later, to rotate the link member 110.

[0036] Of the two ends of the link member 110, the other output end 112 side is bent so as to be one step higher than the reference plane of the link member 110. The rear end side of a shaft 121 of a regulating member 120, which will be 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 an elongated hole 112b that allows the pivot pin 112a to move a predetermined length 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 preferable to provide similar play at the connection point of the fixing pin 111a to the input end 111 of the link member 110.

[0037] The restricting member 120 is provided with a restricting portion 122, which has a substantially C-shaped cross section and opens forward in a direction perpendicular to the axial direction of the shaft portion 121, integrally provided on the front end side of the linearly extending shaft portion 121. The restricting member 120 is disposed at a position where the restricting portion 122 approaches or moves away from the side perpendicular to the piston rod 53 of the damper 51, and where the rear end side of the shaft portion 121 is connected to the output end 112 of the link member 110.

[0038] Restriction member 120 is supported so as to be able to move back and forth in the axial direction of shaft portion 121 via mounting bracket 123, which is fixed to the bottom surface of housing 101 and has a substantially U-shape in a plan view. A guide groove 121a (see FIG. 5) is provided on the rear end side of shaft portion 121 so as not to interfere with the rotational trajectory of output end 112 of link member 110. Restriction member 120 like this is pre-assembled to housing 101 together with mounting bracket 123, link member 110, etc., and reclining restriction portion 100 is configured as a single unit.

[0039] 5 and 7, when the restricting portion 122 of the restricting member 120 is disengaged 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. ​​In this state where the damper 51 is able to contract, the backrest 3 can tilt backward.

[0040] 6 and 8, when the restricting portion 122 of the restricting member 120 approaches 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. ​​In this state where the contraction of the damper 51 is directly restricted, the backrest 3 cannot tilt backward.

[0041] When the seat 1 is in the cross state, as shown in Figures 5 and 7, the restricting member 120 is normally biased in a direction in which the restricting portion 122 separates from the piston rod 53 by the biasing force of the spring member 124 provided on the shaft portion 121. However, when the seat 1 is converted to the cross state, 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.

[0042] <pedestal 11> As shown in Fig. 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 stand extending in a direction (front-to-back 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 side portions 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.

[0043] The base 11 is placed on the floor with its rear end portion in close proximity to and substantially parallel to the wall W. That is, the base 11 is fixed so that both sides parallel to its longitudinal direction are substantially perpendicular to the wall W, and its front and rear ends parallel to its lateral direction are substantially 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 underframe 30.

[0044] <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.

[0045] <Mobile stand 20> As shown in Figures 1 and 2, the movable platform 20 is placed approximately horizontally on the upper surface of the base 11 and is formed by combining frame materials 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 or backward in a direction approximately 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.

[0046] <Frame 30> As shown in Figures 1 and 2, the underframe 30 is the frame of 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 into a substantially 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 arranged on the underside of the underframe 30.

[0047] <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 in forward and reverse directions 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 this rotation mechanism 40, the outer turntable is fixed to the movable base 20, and the inner turntable is fixed to the frame 30.

[0048] The rotation axis around which the seat 1 rotates is the center line of the rotation mechanism 40, and in this embodiment, it does not have a physical entity. As shown in FIG. 3, the rotation mechanism 40 is equipped with a motor 41 as a power source. A reducer is attached to the motor 41, and a drive gear on the output shaft of the motor 41 is rotatably engaged with a sprocket 42 whose center is a rotation axis provided on the underframe 30 side. The rotation mechanism 40 can also be used to rotate the seat manually.

[0049] <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, which inevitably prevents the movable base 20 from moving forward or backward relative to the base 11.

[0050] 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. A total of three locking holes 62a, 62b, and 62c are 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.

[0051] The lock pin 61 is incorporated into a housing 60a that forms a unit, and the housing 60a is fixed near the rear end on the upper surface of the base 11. The lock pin 61 is retractable upward from the upper 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.

[0052] When the seat 1 is converted into the long position, the one cross position, or the reverse cross position, the lock pin 61 fits into the matching locking holes 62a, 62b, and 62c on the underframe 30 at the top and bottom in each position, thereby restraining the seat 1 so that it cannot rotate. That is, in the long position, the lock pin 61 fits into the locking hole 62a on one long side of the underframe 30. In addition, 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. Furthermore, in the reverse cross position, the lock pin 61 fits into the locking hole 62c on the other short side of the underframe 30.

[0053] 11 and 12, housing 60a incorporating lock pin 61 is provided with a spring member (not shown) that constantly biases lock pin 61 upward to the locked position, and link 60b that retracts lock pin 61 downward to the unlocked position against the biasing force of the spring member. Although not shown, the output end of foot-operated rotation operating cable 76 (see FIG. 9) is connected to link 60b.

[0054] 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 or the like (described later), the lock pin 61 is set to retract into the unlocked position against the biasing force of the spring member. As shown in Figure 9, the input end side of the rotation operation cable 76 is extended to the rotation operation unit 70 provided on the base 11 side. As will be described later, operation of the rotation operation unit 70 pulls the rotation operation cable 76 (see Figure 9), and the constraint of the rotation lock mechanism 60 is released.

[0055] Although not shown, one end of a rotary operation cable for electric operation 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, 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 is possible to switch between an operation of rotating seat 1 by rotation mechanism 40 and an operation of retracting lock pin 61 to release the lock. Note that the configuration related to the clutch of motor 41 is common, so a detailed description will be omitted.

[0056] In the rotation lock mechanism 60 according to this embodiment, when the seat 1 is in the extended position, the restraint imposed by the rotation lock mechanism 60 cannot be released by stepping on the rotation operating unit 70, but can be released only by the electric rotation operation of 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.

[0057] <Rotation operation unit 70> As shown in Fig. 1, the seat 1 is provided with a rotation operation unit 70. The rotation operation unit 70 is used to release the restraint imposed by the lock pin 61 of the rotation lock mechanism 60. As shown in Fig. 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, a mounting part 22 (see Fig. 3) hanging down from the front end side of the movable platform 20.

[0058] 9 and 10, the rotary operation unit 70 is provided with a foot pedal 74 that is pivotally supported via a pivot 73 at the lower end of a support bracket 72 that is fixed to the front side of a housing 71. The tip end of the foot pedal 74 can swing back and forth around the pivot 73, on which the base end is pivotally supported.

[0059] Foot pedal 74 swings between a use position (see Figure 9) where the tip side protrudes forward from housing 71, and a storage position (see Figure 10) where the tip side retracts upward. Foot pedal 74 is normally biased to the use position where it protrudes forward via spring member 75. When foot pedal 74 is in the use position, it can be depressed to release the restraint by rotation lock mechanism 60, but when foot pedal 74 is in the storage position, it cannot be released by rotation lock mechanism 60.

[0060] 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, which is in the use position, is pressed downward, 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.

[0061] Additionally, a shaft-shaped engaged portion 77 is fixed to the base end of foot pedal 74, protruding in both directions at a position eccentric to pivot 73. The input end of a reclining restriction cable 130 extending from the reclining restriction portion 100 is connected to engaged portion 77 via a connector or the like. When engaged portion 77 engages with engaging portion 79 (described below), reclining restriction cable 130 is pulled, causing restriction member 120 of reclining restriction portion 100 to protrude, directly restricting the operation of reclining mechanism 50 itself.

[0062] <Rotational operation prevention mechanism 78> Furthermore, 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.

[0063] 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. On the other hand, the engaged portion 77 is provided in the shape of a shaft at a position eccentric from the pivot 73 on the base end side of the foot pedal 74, as described above. The engaged portion 77 is set 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, thereby 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.

[0064] <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 so that the seat 1 does not interfere with the wall W when the seat 1 is converted into the long state, one-cross state, or reverse-cross state. The interlocking mechanism is usually provided on the base 11 and the movable base 20.

[0065] 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 table 20, causing the movable table 20 to move together with the frame 30 in a linear direction toward or away from the wall W. The type of such interlocking mechanism is not particularly limited, but specifically, for example, it is preferable to use the invention described in Japanese Patent No. 6549634 or Japanese Patent No. 6932469, both of which have been proposed by the present applicant.

[0066] <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 extended state, 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 extended state, the base 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.

[0067] At this time, in the rotation lock mechanism 60, the lock pin 61 shown in Fig. 11 is fitted into the locking hole 62a (see Fig. 2) on one long side of the underframe 30. Here, the lock pin 61 protrudes from the foot base 11, which is the fixed side of the seat 1, so not only is the seat 1 unable to rotate, but at the same time it is also unable to slide.

[0068] When the seat 1 is in the extended position, the rotation operation prevention mechanism 78 prevents the release operation of the rotation operation unit 70, as shown in Figure 10. That is, in the extended position, the engaged portion 77 of the foot pedal 74 on the movable base 20 side engages with the engaging portion 79 on the foot base 11 side. Then, the foot pedal 74 swings to the upright storage position against the biasing force of the spring member 75, and is restrained in the storage position.

[0069] As a result, when the seat 1 is in the extended position, the foot pedal 74 is not simply displaced to a stowed position where it cannot be operated, but is firmly held in the stowed position by 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 disabled. With this simple configuration, it is possible to reliably prevent the seat occupant from rotating the seat 1 in the extended position.

[0070] <<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 removing 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.

[0071] In the long state shown in Fig. 13(a), after the restraint by the rotation lock mechanism 60 is released, when the seat 1 is rotated in the forward direction (counterclockwise in Fig. 13) by the motor 41 as shown in Fig. 13(b), the seat 1 rotates forward while being driven by an interlocking mechanism (not shown). That is, the underframe 30 rotates forward toward the aisle while rotating in the forward direction so as not to interfere with the wall W.

[0072] 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.

[0073] Furthermore, when the seat 1 is in the cross position, the rotation operation preventing mechanism 78 is released from restricting the 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 base 20 side does not engage with the engaging portion 79 on the foot base 11 side, and is separated. Therefore, the foot pedal 74 is in the use position where it protrudes forward due to the biasing force of the spring member 75.

[0074] At this time, the occupant of the 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 and the lock pin 61 (see Figure 11) retracts downward, releasing the locked state of the rotation lock mechanism 60. This allows the occupant to rotate the seat 1 manually.

[0075] <<Conversion from one cross state to the opposite 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), the seat 1 will move backward or forward while rotating, for example, due to an interlocking mechanism (not shown). 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.

[0076] 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 fits into the locking hole 62c on the other short side of the underframe 30, and the underframe 30 is once again restricted 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. Note that 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, it is sufficient to 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, respectively.

[0077] <<Regulation of the reclining mechanism 50 by the reclining regulation unit 100>> Next, we will explain how the reclining restriction unit 100 restricts the operation of the reclining mechanism 50 itself. As shown in Fig. 1, when the seat 1 is in the cross position, the engaged portion 77 on the movable base 20 side is separated from the engaging portion 79 on the foot base 11 side. Therefore, the engaged portion 77 is not displaced, and the reclining restriction cable 130 (see Fig. 9) is not pulled and is in a released state. At this time, in the reclining restriction unit 100, as shown in Fig. 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.

[0078] 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, i.e., the backrest 3 can be tilted backward. Therefore, when the reclining operation unit 57 is operated, the movable member 56, which is pulled by the reclining operation cable 58, pushes the push pin 54, thereby unlocking the backrest 3 in the reclining mechanism 50, and the seat occupant can tilt the backrest 3 to any angle.

[0079] On the other hand, when the seat 1 is converted to the long position, as shown in Fig. 2, the engaged portion 77 on the movable base 20 engages with the engaging portion 79 on the base 11. Then, as shown in Fig. 10, the engaged portion 77 is pushed and displaced in a direction pulling the reclining restriction cable 130 against the biasing force of the spring member 75. The conversion of the seat 1 to the long position is performed, for example, during rush hour or other times when the seat is crowded.

[0080] 6, in the reclining restriction unit 100, the link member 110 rotates in a direction pushing out the restriction member 120 against the biasing force of the spring member 124. Therefore, the restriction portion 122 of the restriction member 120 engages with the middle of the piston rod 53 of the damper 51. In this manner, when the restriction portion 122 of the restriction member 120 is engaged with the piston rod 53 of the damper 51, the piston rod 53 is prevented from retracting into the cylinder body 52, so the entire damper 51 cannot be retracted and the backrest 3 cannot be tilted backward.

[0081] At this time, when the reclining operation unit 57 is operated, the movable member 56, which is pulled by the reclining operation cable 58, pushes the push pin 54, thereby releasing the locking mechanism of the damper 51. However, the restricting member 120 directly restricts the contraction of the damper 51 itself, making it impossible for the backrest to tilt 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 accidentally tilting and interfering with the wall W.

[0082] 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 the upright position. This operation may be performed by, for example, providing an electrically operated reclining operation cable 58a (see FIG. 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, similar to the electrically operated unlocking operation of the rotation lock mechanism 60 described above.

[0083] <Outline of the 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 explanations will be omitted.

[0084] The reclining restriction unit 100A of the 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.

[0085] 16 to 19, reclining restriction unit 100A includes a lock pin 140 instead of restriction member 120. A tip end 142 of a body portion 141 of lock pin 140 is formed with a small diameter, and a locking hole 56a into which tip end 142 of lock pin 140 engages and disengages is provided in the leg portion of movable member 56. Lock pin 140 is supported on the bottom surface of housing 101 via mounting bracket 123 so as to be able to reciprocate in the axial direction. Note that a guide groove 141a is provided on the rear end side of body portion 141 so as not to interfere with the rotational trajectory of output end 112 of link member 110.

[0086] 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 as described above using the reclining operation unit 57. 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.

[0087] When the seat 1 is in the cross position, as shown in Fig. 18, the lock pin 140 is normally biased in a direction such that the tip 142 is disengaged from the locking hole 56a by the biasing force of the spring member 124 provided on 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 Fig. 19, the tip 142 of the lock pin 140 engages with the locking hole 56a against the biasing force of the spring member 124.

[0088] According to the reclining regulation 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 regulating the unlocking operation of the locking means of the damper 51, regardless of the operation of the reclining operation unit 57 by the seat occupant.

[0089] <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.

[0090] 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 including reclining restriction units 100, 100A that directly restrict the operation of the reclining mechanism 50 itself to disable the backward tilting of the backrest 3 when the seat 1 is in a specific state.

[0091] With this configuration, when the state of the seat 1 can be changed, it is possible to directly and reliably restrict the reclining of the backrest 3 only when the seat is in a specific state where reclining of the backrest 3 becomes a problem. 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.

[0092] Therefore, 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. Also, there is no need to separately provide 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 reduce costs.

[0093] 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.

[0094] With this configuration, the contraction of the damper 51 itself, which supports the backrest 3 so that it can be reclined, is directly restricted, thereby more reliably restricting the backward tilting movement of the backrest 3 with a simple configuration.

[0095] Alternatively, in the present invention, the reclining mechanism 50 is bridged between the backrest 3 and the fixed side of the seat 1, is extendable, and is provided with a damper 51 equipped with a locking means that can lock the extension / 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 state.

[0096] With this configuration, the backward tilting movement of the backrest 3 can be more reliably restricted with a similarly simple configuration by directly restricting the release operation of the locking means of the damper 51 itself, which supports the backrest 3 so that it can be reclined.

[0097] The present invention also provides 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 interlocked to change the state of the seat 1 as follows: The back of the seat is in a long state, with the back of the seat 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, The particular state of the seat 1 corresponds to the long state.

[0098] With this configuration, the seat device 10, 10A can be applied as is to a typical rotating seat mounted on a railway vehicle, as described in the above-mentioned embodiment. When the seat 1 is in the extended position, the back of the backrest 3 is close to and substantially parallel with the wall W, so that the reclining restriction unit 100, 100A must be used to restrict the backward tilting movement of the backrest 3, as described above.

[0099] 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.

[0100] With this configuration, it is possible to operate the reclining restriction units 100, 100A due to the mechanical engagement between the engaging portion 79 and the engaged portion 77. With this simple configuration, and without using electric power, it is possible to disable the backward tilting movement of the backrest 3 only when the seat 1 is in the long position, which is a specific position.

[0101] Furthermore, the present invention provides a seat 1 having a fixed side, which is a base 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.

[0102] With this configuration, it is possible to realize an optimal layout for the engaging portion 79 and the engaged portion 77 among 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, and it is possible to configure and arrange them in a compact overall manner.

[0103] Although the embodiments have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions that do not depart from the gist of the present invention are also included in the present invention. For example, the shapes of the base 11, the movable platform 20, and the underframe 30, as well as the specific configurations 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.

[0104] Furthermore, although reclining restriction units 100, 100A are provided separately corresponding to the reclining mechanisms 50 of each backrest 3, it is also possible to provide only one restriction unit so that it operates simultaneously for the two reclining mechanisms 50 of a pair of left and right backrests 3, 3. Specifically, for example, it is also possible to configure the shaft 121 of restriction member 120 to branch into two at the tip end, and to provide restriction units 122 (or tip end 142 of lock pin 140) corresponding to the reclining mechanisms 50 at each end. [Industrial Applicability]

[0105] 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, ships, etc., as well as for theater, home, and office chairs. [Explanation of symbols]

[0106] 10, 10A... Seat device 11...Step stool 14...Slide mechanism 20...Mobile stand 30...frame 40...Rotation mechanism 50...Reclining mechanism 57...Reclining control section 60...Rotation lock mechanism 70...Rotation control unit 74...Foot pedal 77...Engaged portion 78...Rotation operation prevention mechanism 79...Engagement part 100, 100A...Reclining control section 110...Link member 120...Regulatory member 130...Reclining control cable 140...Lock pin

Claims

1. 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 bridged between the backrest and the fixed side of the seat, is extendable and retractable, and is provided with a damper including a locking means that can lock the extension and retraction 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.

2. 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.

3. 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.

4. 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.

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