Seat

Abstract

A seat (10) provided in a vehicle has a seat cushion part (12) and a rotatable seat back part (14) supported by the seat cushion part. The seat back part comprises: a winding device (24) that winds a seat belt (38) used by an occupant of the vehicle seated in the seat cushion part; and a sliding device (26) that slides the winding device.

Description

Seat

[0001] The present disclosure relates to a seat.

[0002] Japanese Unexamined Patent Publication No. 2000-280861 discloses a technology related to an automobile seat belt device. According to Japanese Unexamined Patent Publication No. 2000-280861, the guide device moves toward the occupant in accordance with an amount of the seat belt drawn out.

[0003] In recent years, improved technology has been desired for seats installed in vehicles together with seat belts.

[0004] An object of the present disclosure is to solve the problems described above.

[0005] One aspect of the present disclosure is a seat installed in a vehicle, comprising a seat cushion portion and a rotatable seat back portion supported by the seat cushion portion, wherein the seat back portion includes a retracting device that retracts a seat belt used by an occupant of the vehicle seated on the seat cushion portion, and a sliding device that slides the retracting device.

[0006] According to the present disclosure, there is provided a seat that can appropriately restrain a vehicle occupant by a seat belt.

[0007] FIG. 1 is a perspective view of a seat according to an embodiment. FIG. 2 is a schematic diagram for explaining the configuration of the seat back portion of FIG. 1. FIG. 3 is a diagram showing a part of a cross-section of the seat back portion. FIG. 4 is a schematic diagram illustrating the seat when the retracting device of FIG. 2 is slid. FIG. 5 is a block diagram of a position control device. FIG. 6 is a flowchart showing a method for controlling a sliding device by the position control device. FIG. 7 is a schematic diagram showing a connecting member according to Modification 1 and a seat including the connecting member. FIG. 8 is a schematic diagram showing a connecting member according to Modification 2 and a seat including the connecting member. FIG. 9 is a schematic diagram illustrating the seat when the retracting device of FIG. 8 is slid.

[0008] Vehicles such as automobiles are equipped with seats and seat belts. A seat comprises a seat cushion and a seat back. The seat cushion supports the occupant's torso from below. The seat back supports the occupant from behind. The seat back is connected to the seat cushion in a rotatable manner. The seat back is, for example, the backrest of a reclining seat.

[0009] Incidentally, seat belt retraction devices are sometimes installed on the seat back. In this case, as the seat back rotates, the relative position between the seat belt and the seated occupant may shift. As a result, there was a concern that the occupant might not be adequately restrained by the seat belt.

[0010] Based on the above preliminary explanation, one embodiment will be described below.

[0011] In the following explanation, the term "program" (computer program, computer software) is also referred to as a "computer program product." Computer program products are not limited to programs stored on storage media (recording media), but also include programs transmitted, distributed, and downloaded via networks such as the Internet.

[0012] Furthermore, the X direction shown in the drawings used in the following description corresponds to the width direction of the seat 10 (seat back portion 14) in the following description. The Y direction corresponds to the vertical direction of the seat 10 (seat back portion 14). The Z direction corresponds to the front-to-back direction of the seat 10 (seat back portion 14). The X, Y, and Z directions are orthogonal. The X direction includes the right direction X1 and the left direction X2. The Y direction includes the upward direction Y1 and the downward direction Y2. The Z direction includes the forward direction Z1 and the backward direction Z2.

[0013] (One Embodiment) Figure 1 is a perspective view of a sheet 10 according to one embodiment.

[0014] The seat 10 is a seat installed in a vehicle. The vehicle is, for example, an automobile or other vehicle, but is not limited to this. The seat 10 comprises a seat cushion portion 12 and a seat back portion 14.

[0015] The seat cushion portion 12 is a seat that supports the torso of the vehicle's occupant from below. The seat back portion 14 supports the occupant seated on the seat cushion portion 12 from behind. For example, the backrest of a reclining seat includes the seat back portion 14.

[0016] The seat back portion 14 comprises a frame portion 16 and an exterior portion 18. The frame portion 16 has a frame (frame group). The frame forms the skeleton of the seat back portion 14. The exterior portion 18 covers the frame portion 16. For example, a cushioning member provided to the occupant is included in the exterior portion 18.

[0017] The frame portion 16 is connected to the pivot shaft portion 20. The pivot shaft portion 20 is, for example, located in the seat cushion portion 12. The seat back portion 14, including the frame portion 16, is rotatable about the pivot shaft portion 20 as its axis. In other words, the tilt angle Φ of the seat back portion 14 with respect to a plane such as a horizontal plane changes about the pivot shaft portion 20. It may also be interpreted that the tilt angle Φ of the seat back portion 14 with respect to the seat cushion portion 12 changes about the pivot shaft portion 20. The pivot shaft portion 20 extends in the width direction of the seat 10. In this case, the seat back portion 14 tilts forward or backward about the pivot shaft portion 20 as its axis. The seat back portion 14 may also rotate in response to the operation of an unillustrated operating part (such as a lever) provided on the seat 10.

[0018] Furthermore, the upper end portion 14u of the seat back portion 14 has a pair of shoulder portions 14s and a central end portion 14c. Each of the pair of shoulder portions 14s is the end portion of the upper end portion 14u in the width direction. The pair of shoulder portions 14s includes a first shoulder portion 14s1 and a second shoulder portion 14s2. The first shoulder portion 14s1 is one shoulder portion 14s in the width direction. The second shoulder portion 14s2 is the other shoulder portion 14s in the width direction. The direction from the second shoulder portion 14s2 toward the first shoulder portion 14s1 along the width direction (rightward direction X1) coincides with the direction from the virtual center line LC toward the winding device 24 along the width direction. The virtual center line LC and the winding device 24 will be explained later (see also Figure 2). The central end portion 14c is the portion located between the pair of shoulder portions 14s. A headrest 22 may be provided at the central end portion 14c. In this case, the first shoulder portion 14s1 is located on one side along the width direction relative to the headrest 22. The second shoulder portion 14s2 is located on the other side along the width direction relative to the headrest 22.

[0019] Figure 2 is a schematic diagram illustrating the configuration of the seat back portion 14 in Figure 1. Figure 3 is a diagram showing a part of the cross-section of the seat back portion 14. The cross-section along line III-III in Figure 2 is shown in Figure 3.

[0020] The sheet 10 further comprises a winding device 24, a sliding device 26, a guide member 28, a connecting member 30, a plate-shaped member 32, a tilt angle detection device 34, and a position control device 36. The winding device 24, the sliding device 26, the guide member 28, the connecting member 30, the plate-shaped member 32, and the tilt angle detection device 34 are provided in the sheet back portion 14.

[0021] The winding device 24 is a device for winding up the seat belt 38 used by an occupant sitting in the seat cushion portion 12. The winding device 24 may be housed in the outer casing portion 18 together with the sliding device 26. In that case, the seat belt 38 extending from the winding device 24 extends out of the outer casing portion 18 through an opening (not shown) that is pre-formed in the outer casing portion 18. This opening is formed, for example, at the upper end portion 14u of the seat back portion 14. In that case, the opening may be formed at the shoulder portion 14s. In this case, the seat belt 38 extends to the front of the seat back portion 14 via the shoulder portion 14s (upper end portion 14u). It is preferable that the opening from which the seat belt 38 extends is elongated in the width direction, taking into consideration the movement of the guide member 28, which will be described later.

[0022] The sliding device 26 is a device that slidably supports the winding device 24. The sliding device 26 has a slider portion 40 and a slider drive portion 42. The slider portion 40 is a member that supports the winding device 24. The slider drive portion 42 is a mechanism that moves the slider portion 40 in a predetermined sliding direction. The predetermined sliding direction may coincide with the width direction of the seat back portion 14.

[0023] Figure 4 is a schematic diagram illustrating the sheet 10 when the winding device 24 in Figure 2 is slid.

[0024] The slider drive unit 42 includes, for example, a ball screw mechanism 44. The ball screw mechanism 44 includes a screw shaft 46, a nut (not shown) screwed onto the screw shaft 46, and a drive source (not shown) for rotating the screw shaft 46. The screw shaft 46 extends in a predetermined sliding direction. The screw shaft 46 may be fixed to the frame 16. In this case, the screw shaft 46 may be fixed to the frame 16 via a plate-shaped member 32. The nut screwed onto the screw shaft 46 is connected to the slider part 40 described above. The drive source for rotating the screw shaft 46 is, for example, an electric motor. As the screw shaft 46 is rotated by the drive source, the nut screwed onto the screw shaft 46 and the slider part 40 connected to the nut move in a predetermined sliding direction.

[0025] In a front view of the sheet 10, it is preferable that the winding device 24 and the sliding device 26 do not overlap with the virtual center line LC of the sheet back portion 14. In other words, it is preferable that the winding device 24 is located inside the sheet back portion 14 and within one region in the width direction relative to the virtual center line LC. Such a sliding device 26 is relatively compact. In this case, the winding device 24 is located, for example, to the right X1 with respect to the virtual center line LC (Figure 2), but it may also be located to the left X2 with respect to the virtual center line LC.

[0026] The virtual center line LC is a virtual straight line that passes through the center of the sheet back portion 14 in the width direction and extends in the vertical direction. The winding device 24 and the sliding device 26 are preferably located on one side of the sheet back portion 14 in the width direction relative to the virtual center line LC. As described above, the winding device 24 is slidable. Even when the winding device 24 and the virtual center line LC are closest within the sliding range of the winding device 24 (extending range of the screw shaft 46), it is preferable that the winding device 24 and the virtual center line LC do not overlap in a front view of the sheet back portion 14. Figure 2 shows the state in which the winding device 24 and the virtual center line LC are closest within the sliding range of the winding device 24 (extending range of the screw shaft 46).

[0027] The guide member 28 is a member that guides the seat belt 38 extending from the winding device 24 to the front of the seat back portion 14. The guide member 28 is positioned on the shoulder portion 14s in the direction toward the winding device 24 from the virtual center line LC. For example, if this direction is to the right X1, the guide member 28 is positioned on the first shoulder portion 14s1.

[0028] The guide member 28 is provided so as to be slidable in the width direction of the seat back portion 14. For example, the first shoulder portion 14s1 is provided with a guide frame 48 that extends in the width direction. The guide frame 48 supports the guide member 28 so as to be slidable in the width direction. The guide frame 48 may have guide rails that guide the guide member 28 in the width direction.

[0029] The end portion 28t of the guide member 28 in one direction of movement may be more movable in that direction than the end portion 16t of the frame portion 16 of the seat cushion portion 12 in that direction. This direction of movement is the direction from the virtual center line LC toward the winding device 24 (in this embodiment, the rightward direction X1). That is, the end portion 28t of the guide member 28 in the direction from the virtual center line LC toward the winding device 24 may be more movable in that direction than the end portion 16t of the frame portion 16 in that direction (see also Figure 4).

[0030] The connecting member 30 is a member that connects the winding device 24 and the guide member 28. The connecting member 30 may be integrated with at least one of the winding device 24 and the guide member 28. The connecting member 30 enables the winding device 24 and the guide member 28 to move in conjunction. That is, when the winding device 24 slides by the sliding device 26, the guide member 28, which is connected to the winding device 24 via the connecting member 30, can also slide. As a result, the position of the seat belt 38 at the upper end 14u of the seat back portion 14 also changes in accordance with the sliding of the winding device 24.

[0031] As shown in Figure 3, the connecting member 30 may have a guide path 30a. The guide path 30a is formed, for example, by a hole or groove extending from the winding device 24 toward the guide member 28. The guide path 30a guides the seat belt 38 from the winding device 24 toward the guide member 28. The guide path 30a also prevents the seat belt 38 from interfering with surrounding members (such as the frame 16) between the winding device 24 and the guide member 28.

[0032] The plate-shaped member 32 is positioned in the forward direction Z1 relative to the winding device 24 and the sliding device 26. The plate-shaped member 32 is fixed to the frame 16 of the seat back portion 14. The winding device 24 and the plate-shaped member 32 overlap in a front view of the seat back portion 14. In other words, the plate-shaped member 32 is interposed between the occupant sitting on the seat cushion portion 12 and the winding device 24. As a result, the plate-shaped member 32 can protect the winding device 24 (sliding device 26) from loads, impacts, etc. applied from the front.

[0033] At least a portion of the plate-shaped member 32 may overlap with the connecting member 30 when viewed from the front of the seat back portion 14. This allows the plate-shaped member 32 to protect not only the winding device 24 (sliding device 26) but also the connecting member 30 from loads, impacts, etc.

[0034] It is preferable that the plate-shaped member 32 does not overlap with the virtual center line LC described above when viewed from the front of the seat back portion 14. In other words, it is preferable that the entire plate-shaped member 32 is located on one side (to the right X1) in the width direction of the seat back portion 14 with respect to the virtual center line LC. Such a plate-shaped member 32 may be relatively compact. The shape of the plate-shaped member 32 may be appropriately determined considering the positional relationship with the sliding device 26, the connecting member 30, the blower 60 described later, etc. For example, the plate-shaped member 32 may have one or more notches 32c.

[0035] The tilt angle detection device 34 is a device that detects the tilt angle Φ of the seat back portion 14 relative to the seat cushion portion 12. The tilt angle detection device 34 has a sensor that outputs a detection signal corresponding to the tilt angle Φ of the seat back portion 14 relative to the seat cushion portion 12. This sensor is a tilt sensor that detects the tilt angle of an object (seat cushion portion 12) relative to a plane such as a horizontal plane. The tilt sensor is provided on the seat back portion 14. The tilt sensor may also be provided on the sliding device 26, for example. The tilt angle detection device 34 may also have a rotation position sensor that outputs a detection signal corresponding to the rotation position of the pivot shaft portion 20.

[0036] If the seat back portion 14 is the backrest of a reclining seat, the tilt angle detection device 34 may be a reclining control device 50. The reclining control device 50 is a control device (computer) that controls the reclining operation of the reclining seat. The reclining control device 50 may be connected to the position control device 36 via a transmission line 68 capable of transmitting signals. This allows the reclining control device 50 to exchange various types of information with the position control device 36. This information may include, for example, information indicating the amount of change in the tilt angle Φ, the direction of change, etc., corresponding to the reclining operation described above (detection signal, tilt angle information, etc.).

[0037] The position control device 36 is a control device that controls the sliding movement of the winding device 24. The position control device 36 may be provided on the sliding device 26 or on the reclining control device 50. The position control device 36 may be a relatively small computer such as a microcontroller.

[0038] Figure 5 is a block diagram of the position control device 36.

[0039] As shown in Figure 5, the position control device 36 has a storage unit 52 and an arithmetic unit 54. The storage unit 52 has one or more memories. For example, the storage unit 52 includes one or more non-volatile memories. The storage unit 52 may further include one or more volatile memories. The arithmetic unit 54 has a processing circuit. The processing circuit is a circuit capable of performing arithmetic processing. The processing circuit includes, for example, one or more processors. This processing circuit may include an integrated circuit or a discrete device.

[0040] The calculation unit 54 includes a tilt angle acquisition unit 56 and a slide control unit 58. The tilt angle acquisition unit 56 and the slide control unit 58 are implemented by the processing circuit described above. For example, one or more processors provided in the processing circuit implement the tilt angle acquisition unit 56 and the slide control unit 58 based on a program stored in memory.

[0041] The tilt angle acquisition unit 56 acquires tilt angle information based on the detection signal from the tilt angle detection device 34. The tilt angle information indicates the tilt angle Φ of the seat back section 14. More specifically, the tilt angle information indicates the amount of change in the tilt angle Φ and the direction of change of the tilt angle Φ when the tilt angle Φ changes.

[0042] The slide control unit 58 controls the slide device 26 based on the tilt angle information. More specifically, the slide control unit 58 determines whether a tilting operation of the seat back unit 14 is performed based on the tilt angle information. When the tilt angle Φ is maintained (no tilting operation is performed), the slide control unit 58 controls the slide device 26 such that the position of the winding device 24 is maintained. When the tilt angle Φ changes, the slide control unit 58 displaces the winding device 24 by displacing the slider unit 40 in accordance with the change in the tilt angle Φ.

[0043] Furthermore, as described above, the tilt angle information indicates the change direction of the tilt angle Φ. Based on this tilt angle information, the slide control unit 58 can further determine whether the tilting operation of the seat back unit 14 corresponds to a forward tilting operation or a rearward tilting operation. When the seat back unit 14 tilts forward, the slide control unit 58 displaces the winding device 24 in a direction (X2 direction) from the first shoulder portion 14s1 of the seat back unit 14 toward the second shoulder portion 14s2, which is the other shoulder portion. In other words, the more the seat back unit 14 tilts forward, the closer the slide control unit 58 brings the winding device 24 to the aforementioned virtual center line LC. Further, for example, when the seat back unit 14 tilts rearward, the slide control unit 58 displaces the winding device 24 in a direction from the second shoulder portion 14s2 toward the first shoulder portion 14s1 (right direction X1). In other words, the more the seat back unit 14 tilts rearward, the further the position control device 36 moves the winding device 24 away from the virtual center line LC.

[0044] FIG. 6 is a flowchart showing a control method for the slide device 26 by the position control device 36.

[0045] The position control device 36 (processing circuit) executes, for example, the control method shown in FIG. 6. This control method includes a tilt angle acquisition step S1 and a slide control step S2.

[0046] In the tilt angle acquisition step S1, the tilt angle acquisition unit 56 acquires the tilt angle information.

[0047] In slide control step S2, a slide control unit (58) controls a slide device (26) based on tilt angle information. This slide control step S2 includes an operation determination step S21, a position maintaining step S22, a first movement control step S23, and a second movement control step S24.

[0048] In the operation determination step S21, the slide control unit (58) determines the operation state of a seat back unit (14) based on the tilt angle information.

[0049] When the tilt angle Φ of the seat back unit (14) is maintained (no tilting operation is performed), the position maintaining step S22 is started. In the position maintaining step S22, the slide control unit (58) maintains the position of a winding device (24). In other words, in the position maintaining step S22, the slide control unit (58) restricts the displacement of the winding device (24).

[0050] When the seat back unit (14) performs a forward tilting operation, the first movement control step S23 is started. In the first movement control step S23, the slide control unit (58) displaces the winding device (24) in a direction from a first shoulder portion (14s1) toward a second shoulder portion (14s2).

[0051] When the seat back unit (14) performs a rearward tilting operation, the second movement control step S24 is started. In the second movement control step S24, the slide control unit (58) displaces the winding device (24) in a direction from the second shoulder portion (14s2) toward the first shoulder portion (14s1).

[0052] The seat back unit (14) may further include an air blower (60) (see also Figs. 2 to 4). The air blower (60) is used for, for example, ventilation inside an exterior unit (18). The air blower (60) has a blower (62) and a duct (64) connected to the blower (62). An air supply port (64a) of the duct (64) faces, for example, a forward direction Z1, but is not limited thereto.

[0053] The blower 60 may be fixed to the frame 16. The position of the blower 60 in a side view of the sheet 10 may overlap with the positions of the winding device 24, sliding device 26, plate-shaped member 32, etc., in the same side view. However, it is preferable that the blower 60 does not overlap with the sliding range of the winding device 24 in a front view of the sheet back portion 14. This suppresses mutual interference between the blower 60 and the winding device 24. Related to this, in a front view of the sheet back portion 14, the blower 60 does not overlap with the movement range of the connecting member 30 which moves in conjunction with the winding device 24. This suppresses mutual interference between the blower 60 and the connecting member 30. Furthermore, it is preferable that the blower 60 does not overlap with the plate-shaped member 32 in a front view of the sheet back portion 14. This suppresses mutual interference between the blower 60 and the plate-shaped member 32.

[0054] According to this embodiment, the rotatable seat back portion 14 includes a winding device 24 for winding up the seat belt 38 and a sliding device 26 for sliding the winding device 24. Since the winding device 24 can slide when the seat back portion 14 rotates, the relative position between the occupant sitting on the seat cushion portion 12 and the seat belt 38 can be adjusted. As a result, even when the seat back portion 14 rotates, it is easier to maintain a state in which the occupant's torso is well restrained by the seat belt 38.

[0055] Furthermore, a guide member 28 provided at the upper end 14u of the seat back portion 14 slides in conjunction with the winding device 24. As a result, the guide member 28 does not obstruct the position adjustment of the seat belt 38 in response to the sliding of the winding device 24. In addition, the guide member 28 can effectively adjust the position of the seat belt 38 at the upper end 14u of the seat back portion 14 in accordance with the rotation of the seat back portion 14. As a result, even when the seat back portion 14 rotates, it is easier to maintain a state in which the occupant's torso is effectively restrained by the seat belt 38.

[0056] According to this embodiment, when the tilt angle Φ of the seat back portion 14 changes, the winding device 24 becomes slidable. On the other hand, when the tilt angle Φ of the seat back portion 14 is maintained, the sliding movement of the winding device 24 is restricted. For example, the position control device 36 allows the winding device 24 to slide when the tilt angle Φ of the seat back portion 14 changes. On the other hand, the position control device 36 maintains the position of the winding device 24 when the tilt angle Φ of the seat back portion 14 is maintained. This prevents the position of the seat belt 38 from changing unintentionally.

[0057] The position control device 36 displaces the winding device 24 in accordance with the change in the tilt angle Φ. This allows the position control device 36 to position the seat belt 38 appropriately according to the tilt state of the seat back 14.

[0058] One embodiment may be modified as shown in the following examples. Descriptions that overlap with the first embodiment will be omitted as appropriate below. Furthermore, among the configurations described below, those identical to those described in the first embodiment will be denoted by the same reference numerals as in the first embodiment.

[0059] (Modification 1) Figure 7 is a schematic diagram showing the connecting member 30 (connecting member 301) according to Modification 1 and the sheet 10 equipped with the connecting member 301. A cross-sectional view similar to that in Figure 3 is shown in Figure 7.

[0060] The connecting member 301 is not only connected to the guide member 28 and the winding device 24, but is also further connected to the slider portion 40 of the sliding device 26. In this case, the winding device 24 may also be connected to the slider portion 40 via the connecting member 301. By connecting the guide member 28, the winding device 24, and the slider portion 40 with the connecting member 301, the guide member 28 and the winding device 24 can be operated in a more integrated manner.

[0061] (Modification 2) Figure 8 is a schematic diagram showing the connecting member 30 (connecting member 302) according to Modification 2 and the sheet 10 equipped with the connecting member 302. A front view similar to that of Figure 2 is shown in Figure 8. Figure 9 is a schematic diagram illustrating the sheet 10 when the winding device 24 of Figure 8 is slid.

[0062] The connecting member 302 has a plurality of relative movable partial connecting portions 66. For example, as shown in Figure 8, the connecting member 302 has a first partial connecting portion 661 and a second partial connecting portion 662. The first partial connecting portion 661 is a partial connecting portion 66 connected to the winding device 24. The second partial connecting portion 662 is a partial connecting portion 66 connected to the guide member 28. The second partial connecting portion 662 is slidably connected to the first partial connecting portion 661. When the second partial connecting portion 662 slides, the relative movement direction D between the second partial connecting portion 662 and the first partial connecting portion 661 coincides with the direction from the winding device 24 toward the guide member 28.

[0063] The connecting member 302 ensures that the winding device 24 and the guide member 28 are well connected and interlocked, even when the predetermined sliding direction of the winding device 24 and the movement direction of the guide member 28 are not parallel. For example, in the example shown in Figure 8, the screw shaft 46 of the slider drive unit 42 is inclined with respect to the width direction, while the guide frame 48 extends parallel to the width direction. In this case, the predetermined sliding direction of the winding device 24 and the movement direction of the guide member 28 are not parallel but intersect. As a result, as the winding device 24 slides along the screw shaft 46, the winding device 24 is displaced not only in the width direction but also in the vertical direction. Therefore, as the winding device 24 slides along the screw shaft 46, the vertical distance between the winding device 24 and the guide member 28 changes. In response to the change in distance, the first partial connecting portion 661 connected to the winding device 24 and the second partial connecting portion 662 connected to the guide member 28 slide in the relative movement direction D between the first partial connecting portion 661 and the second partial connecting portion 662. In other words, the connecting member 302 expands and contracts in response to the change in the vertical distance between the winding device 24 and the guide member 28. As a result, even when the vertical distance between the winding device 24 and the guide member 28 changes, the connecting member 302 continues to connect the winding device 24 and the guide member 28 well. By connecting the winding device 24 and the guide member 28, the connecting member 302 can move the guide member 28 in conjunction with the sliding of the winding device 24.

[0064] (Modification 3) The winding device 24 and the sliding device 26 may be attached to the rear of the seat back portion 14.

[0065] (Modification 4) In one embodiment, a case in which the entire backrest is tiltable has been described, but the configuration of the seat 10 is not limited thereto. That is, in one embodiment the seat back portion 14 includes the entire backrest, but the seat back portion 14 may be a part of the backrest. In that case the backrest has a portion that does not tilt relative to the seat cushion portion 12 and a tiltable portion that is the seat back portion 14. For example the backrest may have a lower portion that does not tilt relative to the seat cushion portion 12 and a tiltable upper portion that is the seat back portion 14.

[0066] (Combinations of multiple variations) The above-mentioned variations may be combined as appropriate, within the bounds of consistency.

[0067] The following additional information is disclosed regarding the embodiments and modifications described above.

[0068] (Note 1) The seat (10) according to the present disclosure is a seat provided in a vehicle, having a seat cushion portion (12) and a seat back portion (14) supported by the seat cushion portion and rotatable, wherein the seat back portion includes a winding device (24) for winding a seat belt (38) used by the occupant of the vehicle sitting on the seat cushion portion, and a sliding device (26) for sliding the winding device. This makes it easier to maintain a state in which the occupant's torso is well restrained by the seat belt even when the seat back portion rotates.

[0069] (Note 2) The sheet described in Note 1 may further include a guide member (28) provided at the upper end (14u) of the seat back portion, which guides the seat belt extending from the winding device to the front of the seat back portion, wherein the guide member slides in conjunction with the winding device. This allows the guide member to adjust the position of the seat belt at the upper end of the seat back portion well in accordance with the rotation of the seat back portion.

[0070] (Note 3) The sheet described in Note 2 may further include a connecting member (30) that connects the winding device and the guide member.

[0071] (Note 4) The sheet described in Note 3 may be a sheet in which the sliding device has a slider portion (40) that slides while supporting the winding device, and the connecting member is connected to the slider portion. The connecting member enables the winding device and the guide member to interlock by physically connecting them.

[0072] (Note 5) The sheet described in Note 3 may further include a blower (60) having a blower (62) and a duct (64) connected to the blower, wherein the range of movement of the connecting member that moves in conjunction with the winding device does not overlap with that of the blower. This suppresses mutual interference between the blower and the connecting member.

[0073] (Note 6) The sheet described in Note 3 may be a sheet in which the connecting member has a first partial connecting portion (661) connected to the winding device and a second partial connecting portion (662) that is slidably connected to the first partial connecting portion and connected to the guide member. This ensures that the connecting member maintains a good connection between the winding device and the guide member even when the vertical distance between them changes.

[0074] (Note 7) The sheet described in Note 3 may be such that the end portion (28t) of the guide member in one direction of movement of the guide member is more movable in that direction than the end portion (16t) of the frame portion (16) of the seat cushion in that direction.

[0075] (Note 8) The sheet described in Note 1 may further include a blower (60) having a blower (62) and a duct (64) connected to the blower, and the sheet may also be such that the sliding range of the winding device and the blower do not overlap in a front view. This suppresses mutual interference between the blower and the winding device.

[0076] (Note 9) The seat described in Note 1 may also be such that when the tilt angle (Φ) of the seat back portion relative to the seat cushion portion changes, the winding device becomes slidable, and when the tilt angle is maintained, the sliding movement of the winding device is more restricted than when the tilt angle changes. This prevents the seat belt position from changing unintentionally.

[0077] (Note 10) The seat described in Note 9 may further include a tilt angle detection device (34) that outputs a detection signal corresponding to the tilt angle, and a position control device (36) that controls the slide device based on the detection signal to displace the winding device in accordance with the change in the tilt angle. This allows the position control device to position the seat belt at an appropriate position according to the tilt state of the seat back.

[0078] (Note 11) The seat described in Note 10 may be a seat in which the winding device is provided inside or at the rear of the seat back portion, the upper end of the seat back portion has a first shoulder portion (14s1) which is one part of the seat back portion in the width direction and a second shoulder portion (14s2) which is the other part, the seat belt extends from the winding device through the first shoulder portion to the front of the seat back portion, and when the seat back portion is tilted backward, the position control device controls the slide device to displace the winding device in the direction from the second shoulder portion toward the first shoulder portion according to the tilt angle, and when the seat back portion is tilted forward, the position control device controls the slide device to displace the winding device in the direction from the first shoulder portion toward the second shoulder portion according to the tilt angle.

[0079] (Note 12) The sheet described in Note 1 may be one in which the sliding device and the virtual center line (LC) extending vertically in the sheet back portion do not overlap in a front view. Such a sliding device is relatively compact.

[0080] (Note 13) The sheet described in Note 1 may further include a plate-shaped member (32) disposed in front of the winding device, wherein the winding device and the plate-shaped member overlap in a front view. In this way, the plate-shaped member can protect the winding device from loads, impacts, etc.

[0081] (Note 14) The sheet described in Note 13 may further include a blower (60) having a blower (62) and a duct (64) connected to the blower, and the sheet may not overlap the plate-shaped member and the blower in the front view. This suppresses mutual interference between the blower and the plate-shaped member.

[0082] (Note 15) The sheet described in Note 14 may further include a guide member (28) that guides the seat belt extending from the winding device to the front of the seat back portion, and a connecting member (30) that connects the winding device and the guide member, wherein the guide member is provided at the upper end of the seat back portion and slides in conjunction with the winding device, and at least a part of the plate-shaped member and the connecting member overlap in the front view. In this way, the plate-shaped member can protect the connecting member from load, impact, etc.

[0083] (Note 16) The sheet described in Note 13 may be a sheet in which the plate-like member and the virtual center line (LC) extending vertically in the sheet back portion do not overlap in the front view. Such a plate-like member may be relatively compact.

[0084] While this disclosure has been described in detail, it is not limited to the individual embodiments described above. These embodiments can be added, replaced, modified, partially deleted, etc., in any way that does not depart from the gist of this disclosure or from the spirit of this disclosure derived from the claims and their equivalents. These embodiments can also be implemented in combination. For example, the order of operations and processes in the embodiments described above are given as examples only and are not limited thereto. The same applies when numerical values ​​or mathematical formulas are used in the description of the embodiments described above.

Claims

1. A seat (10) provided for a vehicle, having a seat cushion portion (12) and a seat back portion (14) supported by the seat cushion portion and rotatable, wherein the seat back portion comprises a retraction device (24) for winding up a seat belt (38) used by an occupant of the vehicle sitting on the seat cushion portion, and a sliding device (26) for sliding the retraction device.

2. A seat according to claim 1, further comprising a guide member (28) provided at the upper end (14u) of the seat back portion, which guides the seat belt extending from the winding device to the front of the seat back portion, wherein the guide member slides in conjunction with the winding device.

3. A sheet according to claim 2, further comprising a connecting member (30) that connects the winding device and the guide member.

4. A sheet according to claim 3, wherein the sliding device has a slider portion (40) that slides while supporting the winding device, and the connecting member is connected to the slider portion.

5. A sheet according to claim 3, further comprising a blower (60) having a blower (62) and a duct (64) connected to the blower, wherein the range of movement of the connecting member that moves in conjunction with the winding device does not overlap with the range of movement of the blower.

6. A sheet according to claim 3, wherein the connecting member comprises: a first partial connecting portion (661) connected to the winding device; and a second partial connecting portion (662) slidably connected to the first partial connecting portion and connected to the guide member.

7. A sheet according to claim 3, wherein the end portion (28t) of the guide member in one direction of movement of the guide member is more movable in that direction than the end portion (16t) of the frame portion (16) of the sheet cushion in that direction of movement.

8. A sheet according to claim 1, further comprising a blower (60) having a blower (62) and a duct (64) connected to the blower, wherein the sliding range of the winding device and the blower do not overlap in a front view.

9. A sheet according to claim 1, wherein the winding device becomes slidable when the tilt angle (Φ) of the seat back portion relative to the seat cushion portion changes, and when the tilt angle is maintained, the sliding movement of the winding device is more restricted than when the tilt angle changes.

10. A sheet according to claim 9, further comprising: a tilt angle detection device (34) that outputs a detection signal corresponding to the tilt angle; and a position control device (36) that controls the slide device based on the detection signal to displace the winding device in accordance with the change in the tilt angle.

11. A seat according to claim 10, wherein the winding device is provided inside or at the rear of the seat back portion, the upper end of the seat back portion has a first shoulder portion (14s1) which is one portion in the width direction of the seat back portion and a second shoulder portion (14s2) which is the other portion, the seat belt extends from the winding device through the first shoulder portion to the front of the seat back portion, when the seat back portion is tilted backward, the position control device controls the slide device to displace the winding device in a direction from the second shoulder portion toward the first shoulder portion according to the tilt angle, and when the seat back portion is tilted forward, the position control device controls the slide device to displace the winding device in a direction from the first shoulder portion toward the second shoulder portion according to the tilt angle.

12. A sheet according to claim 1, wherein the sliding device and the virtual center line (LC) extending vertically in the sheet back portion do not overlap in a front view.

13. A sheet according to claim 1, further comprising a plate-shaped member (32) disposed in front of the winding device, wherein the winding device and the plate-shaped member overlap in a front view.

14. A sheet according to claim 13, further comprising a blower (60) having a blower (62) and a duct (64) connected to the blower, wherein the plate-shaped member and the blower do not overlap in the front view.

15. A seat according to claim 14, further comprising: a guide member (28) for guiding the seat belt extending from the winding device to the front of the seat back portion; and a connecting member (30) for connecting the winding device and the guide member, wherein the guide member is provided at the upper end of the seat back portion and slides in conjunction with the winding device, and at least a portion of the plate-like member and the connecting member overlap in the front view.

16. A sheet according to claim 13, wherein the plate-like member and the virtual center line (LC) extending in the vertical direction of the sheet back portion do not overlap in the front view.

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