Seat swivel device

Abstract

A seat rotating device includes a base plate, a rotating plate, and a connecting unit. The connecting unit includes a rotating link having a fixed end and a rotating end, a guide rail fixed to the base plate and having a linear shape, a support slider movable along the guide rail and configured to support the rotating end, a connecting member connecting the support slider and the rotating link, a lower rail, and an upper slider. The connecting member has a structure capable of absorbing a difference in distance between the rotating end and the support slider when the rotating end and the support slider move relative to the base plate.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a seat swivel device. BACKGROUND

[0002] Conventionally, a seat swivel device that enables a seat body to swivel between a seating position and a boarding position is known. For example, a seat swivel device is disclosed in Japanese Patent Application Publication No. 2022-78502, which includes a base plate, a swivel plate, and a connecting unit. The base plate is fixed to a floor of a vehicle. The swivel plate is fixed to a lower surface of the seat body. The connecting unit connects the base plate and the swivel plate in such a manner that the swivel plate is able to swivel relative to the base plate between the seating position and the boarding position. The connecting unit includes a link. The link has a swivel end portion that is able to swivel about a fixed end portion thereof. A through-hole for guiding movement of the swivel end portion is formed in the base plate. The through-hole is formed in a circular arc shape corresponding to a movement track of the swivel end portion. SUMMARY

[0003] In the seat swivel device described in Japanese Patent Application Publication No. 2022-78502, since the circular arc-shaped through-hole is formed in the base plate, the rigidity of the base plate can possibly be reduced. Therefore, it is considered to provide a circular arc-shaped guide rail on an upper surface of the base plate as a unit for guiding movement of the swivel end portion, and to support the swivel end portion with a slide member that is able to move along the guide rail. However, this configuration requires calculation of an accurate track of the guide rail, and requires precise machining of the guide rail and the slide member to ensure smooth movement of the slide member along the guide rail.

[0004] An object of the present disclosure is to provide a seat swivel device that is able to ensure the rigidity of the base plate and is able to comparatively simply design the guide rail and the support slide member.

[0005] One aspect of this disclosure is a seat rotation device that allows a seat body to rotate between a seating position facing the front of the vehicle and an alighting / getting-out position facing the door opening of the vehicle. The seat rotation device includes: a base plate fixed to the floor of the vehicle; a rotating plate fixed to the lower surface of the seat body without relative rotation relative to the seat body; and a connecting unit that connects the base plate to the rotating plate such that the rotating plate can rotate relative to the base plate between the seating position and the alighting / getting-out position. The connecting unit includes: a rotating link connecting the base plate to the rotating plate, and having a fixed end and a rotating end. The fixed end is fixed to the base plate such that it can rotate relative to the base plate, and the rotating end is fixed to the rotating plate such that it can rotate relative to the base plate with the fixed end as a rotation center and can rotate relative to the rotating plate; a guide rail fixed to the base plate and having a linearly extending shape; and a support slider capable of moving along the guide rail. The rotating plate is movable and used to support the rotating end; a connecting member connects the supporting slider to the rotating link, and connects the supporting slider to the rotating link in such a way that the rotating end can rotate relative to the connecting member; a lower track fixed to the base plate; and an upper slider that can move along the lower track and supports the rotating plate in such a way that the rotating plate can rotate relative to the upper slider, the rotating plate having: a first supported portion supported on the rotating end; and a second supported portion separated from the first supported portion and supported on the upper slider, the upper slider causing the rotating plate to rotate relative to the upper slider in the same direction as the rotation of the rotating plate relative to the rotating end when the rotating plate moves from the seated position to the boarding / alighting position, and causing the second supported portion to move along the lower track, the connecting member having a structure capable of absorbing the difference in distance between the rotating end and the supporting slider generated when the rotating end and the supporting slider move relative to the base plate.

[0006] The above-mentioned and other objects, features, aspects and advantages of the present invention will become clear from the following detailed description relating to the present invention, taken in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 This is a 3D view of the rotating chair at the seating position.

[0008] Figure 2 It is a 3D diagram of the rotating seats at the boarding and alighting points.

[0009] Figure 3 This is a perspective view of the seat rotation device in the first embodiment of the present invention at the seated position.

[0010] Figure 4 It is a 3D diagram of the seat rotation device at the boarding and alighting position.

[0011] Figure 5 It is a diagram showing the positional relationship between the base plate, the rotating plate, and the connecting unit at the seating position and the boarding / alighting position.

[0012] Figure 6 This diagram illustrates the relationship between the inclination of the fixed shaft and the seat surface.

[0013] Figure 7 This diagram illustrates the relationship between the inclination of the fixed shaft and the seat surface.

[0014] Figure 8 It is an exploded perspective view of the rotating connecting rod, guide rail, supporting sliding parts, and connecting components.

[0015] Figure 9 It is a diagram used to illustrate the movement trajectory of the support shaft at the rotating end and the positional relationship between the connecting members.

[0016] Figure 10 This is an exploded perspective view of the rotating linkage, guide rail, support sliding member, and connecting member of the seat rotating device in the second embodiment of this disclosure.

[0017] Figure 11 It is a diagram used to illustrate the movement trajectory of the support shaft at the rotating end and the positional relationship between the connecting members. Detailed Implementation

[0018] Embodiments of this disclosure will be described with reference to the accompanying drawings. Furthermore, in the drawings referred to below, the same or equivalent components are labeled with the same reference numerals.

[0019] (First Implementation)

[0020] Figure 1 This is a 3D view of the rotating chair at the seating position. Figure 2 This is a perspective view of a rotating seat at the boarding and alighting position. This rotating seat 1 functions as a seat in a means of transportation, especially in a vehicle.

[0021] like Figure 1 and Figure 2 As shown, the rotating seat 1 of this embodiment includes a seat body 2 and a seat rotating device 10.

[0022] The seat body 2 has a seat cushion 2a and a seat back 2b. The seat cushion 2a constitutes the seat portion. The seat back 2b supports the back of the occupant sitting on the seat cushion 2a. The seat body 2 is mounted on the floor FL of the vehicle.

[0023] A pair of seat slide members 3 that slide the seat main body 2 with respect to the floor FL in the front-rear direction of the vehicle are installed on the floor FL. The pair of seat slide members 3 are arranged apart from each other in the width direction of the vehicle. Each seat slide member 3 has a lower rail 3a and an upper rail 3b.

[0024] The lower rail 3a is fixed to the floor FL in a posture parallel to the front-rear direction of the vehicle. The upper rail 3b is relatively displaceable with respect to the lower rail 3a in the front-rear direction of the vehicle (the length direction of the lower rail 3a).

[0025] The seat rotating device 10 is capable of rotating the seat main body 2 between a seating position (a position shown in Figure 1 ) and an embarking / disembarking position (a position shown in Figure 2 ). The seating position is a position in which the seat main body 2 faces the front of the vehicle. The embarking / disembarking position is a position in which the seat main body 2 faces an opening portion of a door of the vehicle. The seat rotating device 10 is fixed to the lower surface of the seat main body 2.

[0026] Figure 3 is a perspective view of the seat rotating device in the first embodiment of the application at the seating position. Figure 4 is a perspective view of the seat rotating device at the embarking / disembarking position.

[0027] As shown in Figure 3 and Figure 4 , the seat rotating device 10 includes a base plate 100, a rotating plate 200, a link unit 300, a drive unit 400, and a lock unit 500.

[0028] The base plate 100 is fixed to the floor FL of the vehicle directly or indirectly via other members. In the present embodiment, the base plate 100 is fixed to the upper rail 3b. That is, the base plate 100 is fixed to the floor FL via the seat slide member 3.

[0029] The rotating plate 200 is fixed to the lower surface of the seat main body 2 in a manner that does not relatively rotate with respect to the seat main body 2. As shown in Figure 3 and Figure 4 , the rotating plate 200 includes a pair of side brackets 210, a rear tube 220, a front tube 230, a link plate 240, and a striker 250.

[0030] The pair of side brackets 210 are arranged apart from each other in the width direction. Each side bracket 210 is arranged above the seat slide member 3. Each side bracket 210 has a shape extending in the front-rear direction. In the rear portion of the side bracket 210 arranged on the left side in the width direction among the pair of side brackets 210, a fixer (omitted from illustration) of a seat belt is fixed by a fixing bolt B.

[0031] The rear tube 220 links the rear portions of the pair of side brackets 210 to each other.

[0032] The front pipe 230 links the front portions of the pair of side brackets 210 to each other.

[0033] The link plate 240 links the rear pipe 220 and the front pipe 230.

[0034] As shown in Figure 3 and Figure 4 , the striker 250 is fixed to the rear end portion of the link plate 240. The striker 250 is fixed to the link plate 240 in a state of straddling the inner side end portion of the rear pipe 220.

[0035] The link unit 300 links the base plate 100 and the rotary plate 200 in a manner that the rotary plate 200 is rotatable relative to the base plate 100 between the seating position and the boarding and alighting position.

[0036] The link unit 300 has a rotary link 310, a main slide 320, a sub slide 330, a guide rail 340, a support slide 350, and a connection member 360.

[0037] The rotary link 310 links the base plate 100 and the rotary plate 200. The rotary link 310 has a fixed end portion 311 (refer to Figure 5 ) and a rotary end portion 312.

[0038] The fixed end portion 311 is constituted by one end portion of the rotary link 310. The fixed end portion 311 is fixed to the base plate 100 in a manner that is relatively rotatable relative to the base plate 100. Specifically, the fixed end portion 311 is fixed from the back surface side of the base plate 100 by a fastening member. The fixed end portion 311 is rotatable about a fixed shaft portion 311a that is a center axis of the fastening member.

[0039] The rotary end portion 312 is constituted by the other end portion of the rotary link 310. The rotary end portion 312 is fixed to the rotary plate 200 in a manner that is rotatable relative to the base plate 100 with the fixed shaft portion 311a of the fixed end portion 311 as a center of rotation, and is relatively rotatable relative to the rotary plate 200. Specifically, the rotary end portion 312 is fixed to the rotary plate 200 by a support shaft portion 312a and a fastening member F2. The support shaft portion 312a is constituted by a bolt, and the fastening member F2 is constituted by a nut. The rotary plate 200 is relatively rotatable relative to the rotary end portion 312 about the support shaft portion 312a. Hereinafter, the portion in the rotary plate 200 that is supported by the support shaft portion 312a is referred to as a "first supported portion 201" (refer to Figure 3 and Figure 4 ).

[0040] The main slide 320 has a lower rail 321 and an upper slide 322.

[0041] The lower rail 321 is fixed to the base plate 100. Specifically, the lower rail 321 is fixed to the central portion of the base plate 100. The lower rail 321 has a shape extending in a straight line. The lower rail 321 has a shape extending in a straight line along the diameter of an imaginary circle Al (refer to Figure 5 ) having a length twice the distance between the fixed shaft portion 311a of the fixed end portion 311 and the support shaft portion 312a of the rotating end portion 312 as a radius and centered on the fixed shaft portion 311a. In Figure 5 , the imaginary circle Al and a circle A2 having a length between the fixed shaft portion 311a and the support shaft portion 312a as a radius and centered on the support shaft portion 312a are indicated by single-dot chain lines, and the rotating plate 200 is indicated by double-dot chain lines. In Figure 5 , a vehicle entrance and exit is provided above the rotating plate 200.

[0042] As shown in Figure 5 , the lower rail 321 has a shape extending in a straight line in a direction intersecting the front-rear direction of the vehicle and along the diameter of the imaginary circle Al. The lower rail 321 is inclined with respect to the front-rear direction in such a manner that it gradually approaches the opening of the door as it goes toward the front of the vehicle.

[0043] The upper slide 322 is movable along the lower rail 321. The upper slide 322 supports the rotating plate 200 in such a manner that the rotating plate 200 is relatively rotatable with respect to the upper slide 322. Specifically, the upper slide 322 is fixed to the rotating plate 200 by a fastening member F3. The rotating plate 200 is relatively rotatable with respect to the upper slide 322 about a support shaft portion 322a that is a central axis of the fastening member F3. The support shaft portion 322a is constituted by a bolt. Hereinafter, the portion of the rotating plate 200 supported by the support shaft portion 322a is referred to as a "second supported portion 202" (refer to Figure 3 and Figure 4 ).

[0044] The upper slide 322 relatively rotates the second supported portion 202 of the rotating plate 200 with respect to the upper slide 322 in the same direction as the direction in which the rotating plate 200 rotates with respect to the rotating end portion 312 when the rotating plate 200 moves from the seating position to the entrance and exit position (the clockwise direction in Figure 5 ), and moves along the lower rail 321.

[0045] When the seat main body 2 moves between the seating position and the entrance and exit position, the support shaft portion 322a of the upper slide 322 moves in such a manner that it traces a point on the circle A2 when rotating within the circle A2 and the imaginary circle Al (the diameter of the imaginary circle Al).

[0046] The sub slide 330 has a lower rail 331 and an upper slide 332.

[0047] The lower rail 331 is fixed to the base plate 100. Specifically, the lower rail 331 is fixed to a portion of the base plate 100 between the seat slide 3 disposed on the inner side in the width direction and the lower rail 321 of the main slide 320. The lower rail 331 has a shape extending in a straight line. As shown in Figure 5 , the lower rail 331 is fixed to the base plate 100 in a posture in which an extension line of the lower rail 331 does not pass the fixed shaft portion 311a that is the center of the imaginary circle Al. The lower rail 331 is inclined with respect to the front-rear direction in such a manner that it gradually approaches the opening of the door as it goes toward the front of the vehicle.

[0048] The upper slide 332 is movable along the lower rail 331. The upper slide 332 supports the rotary plate 200 in such a manner that the rotary plate 200 is relatively rotatable with respect to the upper slide 332. Specifically, the upper slide 332 is fixed to the rotary plate 200 by a fastening member (omitted from the drawing). The rotary plate 200 is relatively rotatable with respect to the upper slide 332 about a support shaft portion 332a (refer to Figure 5 ) that is a center axis of the fastening member. Hereinafter, a portion of the rotary plate 200 that is supported by the support shaft portion 332a will be referred to as a "third supported portion".

[0049] The upper slide 332 relatively rotates the third supported portion of the rotary plate 200 with respect to the upper slide 332 in the same direction as the direction in which the rotary plate 200 rotates with respect to the rotary end portion 312 when the rotary plate 200 moves from the seating position to the entry-exit position (clockwise direction in Figure 5 ).

[0050] As shown in Figure 6 and Figure 7 , the extension line AX11 of the fixed shaft portion 311a of the fixed end portion 311 of the rotary link 310 is inclined with respect to a reference axis AX10 that is parallel to a direction orthogonal to the bottom surface of the lower rail 3a of the seat slide 3. Thereby, the seat surface S2 of the seat cushion 2a at the entry-exit position becomes in a posture inclined toward the lower side as it goes toward the front. In addition, the seat surface S2 becomes in a posture inclined toward the lower side as it goes toward the opening of the door of the vehicle (in this embodiment, as it goes toward the right side when viewed from the occupant seated on the seat cushion 2a). Therefore, entry and exit at the entry-exit position become easy. In addition, in Figure 6 and Figure 7 , the seat surface S1 of the seat cushion 2a at the seating position is indicated by a solid line, and the seat surface S2 of the seat cushion 2a at the entry-exit position is indicated by a double-dot chain line.

[0051] The driving unit 400 drives the linking unit 300. The driving unit 400 is fixed to the base plate 100. The driving unit 400 is capable of rotating the rotary link 310 about the fixed end portion 311. The driving unit 400 includes a motor 410 and a gear 420 that transmits an output of the motor 410 to the rotary link 310.

[0052] For example, when the motor 410 is driven in a state where the rotary plate 200 is positioned at the seating position, the rotary link 310 is rotated about the fixed end portion 311, and each upper slide 322, 332 moves forward along each lower rail 321, 331. Thereby, the rotary plate 200 is rotated toward the up-and-down boarding port while moving forward relative to the base plate 100. As a result, the rotary plate 200 is positioned at the up-and-down boarding position.

[0053] The locking unit 500 locks the rotary plate 200 at the seating position. As shown in Figure 3 and Figure 4 , the locking unit 500 is fixed to the base plate 100 by a fastening member F5. The locking unit 500 has a locking device 510, a release actuator 520, and a transmission portion 530.

[0054] The locking device 510 is capable of locking the striker 250. The locking device 510 includes a hook that is movable between a locking position and an unlocking position. The locking position is a position that holds the striker 250 in a state where the rotary plate 200 is positioned at the seating position. The unlocking position is a position that allows the striker 250 to be released.

[0055] The release actuator 520 is constituted by a member different from the locking device 510. The release actuator 520 is a device for releasing the locking of the striker 250 by the locking device 510.

[0056] The transmission portion 530 transmits an output of the release actuator 520 to the locking device 510. The transmission portion 530 is provided with a link mechanism.

[0057] Here, the guide rail 340, the support slide 350, and the connection member 360 are described in detail with reference to Figure 8 and Figure 9 .

[0058] The guide rail 340 is fixed to the base plate 100. The guide rail 340 has a shape that extends in a straight line. The guide rail 340 is open upward. The guide rail 340 is disposed in the vicinity of the rotary end portion 312 of the rotary link 310. More specifically, as shown in Figure 9 , the guide rail 340 is disposed at a position overlapping the movement locus T of the rotary end portion 312 below the movement locus T.

[0059] The support slide 350 is movable along the guide rail 340. The support slide 350 is a slide for supporting the rotation end portion 312. The support slide 350 has an upper rail 351, a roller 352, and a pair of support bolts 353.

[0060] The upper rail 351 has a shape that is open downward. The length of the upper rail 351 in a direction parallel to the length direction of the guide rail 340 is smaller than the length of the guide rail 340 in the direction.

[0061] The roller 352 is held to the upper rail 351. The roller 352 rotates while being in contact with the inner surface of the guide rail 340.

[0062] Each support bolt 353 is fixed to the upper surface of the upper rail 351 by welding or the like. Each support bolt 353 has a shape that extends upward from the upper surface of the upper rail 351. Each support bolt 353 is fixed to the end portion of the upper rail 351 in the length direction of the upper rail 351.

[0063] The connecting member 360 connects the support slide 350 and the rotation link 310. The connecting member 360 connects the support slide 350 and the rotation link 310 in such a manner that the rotation end portion 312 can relatively rotate with respect to the connecting member 360. The connecting member 360 has a structure that can absorb the difference in distance between the rotation end portion 312 and the support slide 350 when the rotation end portion 312 and the support slide 350 move with respect to the substrate 100. In the present embodiment, the connecting member 360 has a bracket 361 and a linking portion 362.

[0064] The bracket 361 is fixed to the support slide 350. Specifically, the bracket 361 is fixed to the upper rail 351 by the support bolt 353 and the nut N. The bracket 361 has an elongated hole 361h having a shape that extends in a direction intersecting the length direction of the guide rail 340. The elongated hole 361h is preferably orthogonal to both the length direction of the guide rail 340 and the up-down direction.

[0065] The linking portion 362 links the rotation end portion 312 and the bracket 361 in a state of being inserted through the elongated hole 361h. The linking portion 362 is movable within the elongated hole 361h. The linking portion 362 is fixed to the rotation end portion 312. The linking portion 362 has a shape that extends downward from the rotation end portion 312. In the present embodiment, the linking portion 362 is composed of a bolt coaxial with the support shaft portion 312a. However, the linking portion 362 can also be composed of a bolt having a center axis different from that of the support shaft portion 312a.

[0066] Figure 9 The positional relationship between the movement locus T of the support shaft portion 312a of the rotation end portion 312 and the connecting member 360 is shown. In the present embodiment, the movement locus T of the support shaft portion 312a is a straight line extending in the length direction of the guide rail 340. The connecting member 360 is a straight line extending in the length direction of the guide rail 340. Figure 9In the state where the rotation plate 200 is located at the seating position, the rotation link 310, the support shaft portion 312a, and the bracket 361 are indicated by a solid line. In the state where the rotation plate 200 is located at the getting-on / off position, and in the state where the rotation plate 200 is located at an intermediate position between the seating position and the getting-on / off position, the rotation end portion 312, the support shaft portion 312a, and the bracket 361 are indicated by a two-dot chain line.

[0067] As shown in Figure 9 , in the state where the rotation plate 200 is located at the seating position and the getting-on / off position, the support shaft portion 312a and the connecting portion 362 are located at one end side (lower side in Figure 9 ) of the long hole 361h of the bracket 361. On the other hand, in the state where the rotation plate 200 is located at the intermediate position, the support shaft portion 312a and the connecting portion 362 are located at the other end side (upper side in Figure 9 ) of the long hole 361h. In this way, the bracket 361 and the connecting portion 362 can absorb the difference in distance between the rotation end portion 312 and the support slide 350, which is generated when the rotation end portion 312 and the support slide 350 move with respect to the base plate 100.

[0068] In the seat rotation device 10 described above, the rigidity of the base plate 100 is effectively ensured by fixing the guide rail 340 to the base plate 100. Moreover, the connecting member 360 has a structure that can absorb the difference in distance between the rotation end portion 312 and the support slide 350, which is generated when the rotation end portion 312 and the support slide 350 move with respect to the base plate 100, and the guide rail 340 has a shape that extends in a straight line. Therefore, the design of the guide rail 340 and the support slide 350 becomes simple.

[0069] (Second Embodiment)

[0070] Next, the support slide 350 and the connecting member 360 of the seat rotation device 10 in the second embodiment of the present disclosure will be described with reference to Figure 10 and Figure 11 . In the second embodiment, only the portions different from the first embodiment will be described, and the description of the same configuration, action, and effect as the first embodiment will not be repeated.

[0071] As shown in Figure 10 and Figure 11 , in the present embodiment, the support slide 350 has a single support bolt 353. The support bolt 353 is composed of a shoulder bolt, and is fixed to the upper surface of the upper rail 351 by welding or riveting, or the like.

[0072] The connecting member 360 has a link 363 and a connecting portion 362.

[0073] The link 363 has a first end portion 363a and a second end portion 363b. The first end portion 363a is constituted by one end portion of the link 363. The first end portion 363a is connected to the support slide 350 in a manner that the first end portion 363a is relatively rotatable with respect to the support slide 350. The first end portion 363a is fixed to the upper rail 351 by the support bolt 353 and the nut. The second end portion 363b is constituted by the other end portion of the link 363. The second end portion 363b is rotatable about the first end portion 363a. The second end portion 363b is fixed to the rotation end portion 312 by the link portion 362 and the nut N in a manner that the second end portion 363b is relatively rotatable with respect to the rotation end portion 312. In other words, the link portion 362 links the rotation end portion 312 and the second end portion 363b in a manner that the second end portion 363b is relatively rotatable with respect to the rotation end portion 312.

[0074] Figure 11 The positional relationship between the moving locus T of the support shaft portion 312a of the rotation end portion 312 and the connection member 360 is shown. As shown in Figure 11 the support shaft portion 312a and the link portion 362 are located on the moving locus of the support bolt 353 when the rotation plate 200 is located at the seating position and the getting-on / off position, on the other hand, the support shaft portion 312a and the link portion 362 are separated from the moving locus of the support bolt 353 by the rotation of the link 363 about the first end portion 363a when the rotation plate 200 is located at the intermediate position. In this way, the link 363 and the link portion 362 can absorb the difference in distance between the rotation end portion 312 and the support slide 350 when the rotation end portion 312 and the support slide 350 are moved with respect to the base plate 100.

[0075] Those skilled in the art will appreciate that the above-described exemplary embodiments are specific examples of the following modes.

[0076] (Mode 1)

[0077] A seat rotation device capable of rotating a seat body between a seating position in which the seat body faces a front of a vehicle and a getting-on / off position in which the seat body faces an opening of a door of the vehicle, the seat rotation device including:

[0078] a base plate fixed to a floor of the vehicle;

[0079] a rotation plate fixed to a lower surface of the seat body in a manner that the rotation plate is not relatively rotatable with respect to the seat body;

[0080] a link unit linking the base plate and the rotation plate in a manner that the rotation plate is rotatable with respect to the base plate between the seating position and the getting-on / off position,

[0081] the link unit including:

[0082] a rotation link that links the base plate and the rotation plate, and has a fixed end portion fixed to the base plate so as to be relatively rotatable with respect to the base plate, and a rotation end portion fixed to the rotation plate so as to be rotatable with the fixed end portion as a center of rotation and relatively rotatable with respect to the rotation plate;

[0083] a guide rail fixed to the base plate and having a shape extending in a straight line;

[0084] a support slide movable along the guide rail and configured to support the rotation end portion;

[0085] a connection member that connects the support slide and the rotation link, and connects the support slide and the rotation link so that the rotation end portion is relatively rotatable with respect to the connection member;

[0086] a lower rail fixed to the base plate; and

[0087] an upper slide movable along the lower rail, and configured to support the rotation plate so that the rotation plate is relatively rotatable with respect to the upper slide,

[0088] the rotation plate has:

[0089] a first supported portion supported by the rotation end portion; and

[0090] a second supported portion supported by the upper slide separately from the first supported portion,

[0091] the upper slide relatively rotates the rotation plate with respect to the upper slide in the same direction as a direction in which the rotation plate rotates with respect to the rotation end portion when the rotation plate moves from the seating position to the getting-on / off position, and moves the second supported portion along the lower rail,

[0092] the connection member has a structure capable of absorbing a difference in distance between the rotation end portion and the support slide that occurs when the rotation end portion and the support slide move with respect to the base plate.

[0093] In the seat rotation device, the rigidity of the base plate is effectively ensured by the base plate fixed guide rail. Moreover, the connection member has a structure capable of absorbing a difference in distance between the rotation end portion and the support slide that occurs when the rotation end portion and the support slide move with respect to the base plate, and the guide rail has a shape extending in a straight line. Therefore, the design of the guide rail and the support slide becomes simple.

[0094] (Manner 2)

[0095] The seat swivel device according to Mode 1, wherein the guide rail is disposed below a movement locus of the swivel end portion at a position overlapping the movement locus.

[0096] In this mode, since the distance between the support slide and the swivel end portion is shortened, miniaturization of the connecting member is achieved. In addition, the load input to the swivel end portion is effectively received by the guide rail.

[0097] (Mode 3)

[0098] The seat swivel device according to Mode 1 or 2, wherein

[0099] The connecting member has:

[0100] a bracket having an elongated hole and fixed to the support slide, the elongated hole having a shape extending in a direction intersecting a length direction of the guide rail; and

[0101] a link portion linking the swivel end portion and the bracket in a state of being inserted through the elongated hole and being movable within the elongated hole.

[0102] (Mode 4)

[0103] The seat swivel device according to Mode 1 or 2, wherein

[0104] The connecting member has:

[0105] a link rod having a first end portion and a second end portion, the first end portion being connected to the support slide in a manner that is relatively rotatable with respect to the support slide, the second end portion being rotatable about the first end portion; and

[0106] a link portion linking the swivel end portion and the second end portion in a manner that the second end portion is relatively rotatable with respect to the swivel end portion.

[0107] While embodiments of the present application have been described, it is to be understood that the embodiments disclosed are illustrative of the present application rather than limiting thereof. It is the intention of the applicant to be limited only by the scope of the patent coverage that issues on the instant application and nothing else.

Claims

1. A seat swivel device capable of swiveling a seat body between a seating position in which the seat body faces a front of a vehicle and an embarking / disembarking position in which the seat body faces an opening portion of a door of the vehicle, wherein The seat rotating device includes: a base plate fixed to a floor of the vehicle; a rotating plate fixed to a lower surface of the seat main body so as not to relatively rotate with respect to the seat main body; a linking unit linking the base plate and the rotating plate so that the rotating plate can rotate with respect to the base plate between the seating position and the getting-on / off position, the linking unit has: a rotating link linking the base plate and the rotating plate and having a fixed end portion fixed to the base plate so as to relatively rotate with respect to the base plate and a rotating end portion fixed to the rotating plate so as to rotate with the fixed end portion as a center with respect to the base plate and relatively rotate with respect to the rotating plate; a guide rail fixed to the base plate and having a shape extending in a straight line; a support slide movable along the guide rail and configured to support the rotating end portion; a connecting member connecting the support slide and the rotating link and connecting the support slide and the rotating link so that the rotating end portion relatively rotates with respect to the connecting member; a lower rail fixed to the base plate; and an upper slide movable along the lower rail and configured to support the rotating plate so that the rotating plate relatively rotates with respect to the upper slide, the rotating plate has: a first supported portion supported by the rotating end portion; and a second supported portion supported by the upper slide separately from the first supported portion, the upper slide relatively rotates the rotating plate with respect to the upper slide in the same direction as a direction in which the rotating plate rotates with respect to the rotating end portion when the rotating plate moves from the seating position to the getting-on / off position, and moves the second supported portion along the lower rail, the connecting member has a structure capable of absorbing a difference in distance between the rotating end portion and the support slide when the rotating end portion and the support slide move with respect to the base plate.

2. The seat rotating device according to claim 1, wherein the guide rail is disposed below a moving locus of the rotating end portion at a position overlapping the moving locus.

3. The seat rotating device according to claim 1 or 2, wherein the connecting member has: a bracket having an elongated hole and fixed to the support slide, the elongated hole having a shape extending in a direction intersecting a length direction of the guide rail; and a linking portion linking the rotating end portion and the bracket in a state of being inserted through the elongated hole and being movable within the elongated hole.

4. The seat rotating device according to claim 1 or 2, wherein the connecting member has: a link having a first end portion connected to the support slide so as to relatively rotate with respect to the support slide and a second end portion rotatable about the first end portion; and a linking portion linking the rotating end portion and the second end portion so that the second end portion relatively rotates with respect to the rotating end portion. ​ ​

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