Reclining seat

Abstract

A flip-type seat has: a seat cushion that rotates around a first axis between a use posture and a storage posture; a sub-link that is supported to rotate around a second axis; a force applying member that applies a force to the sub-link in a first rotation direction; a leg support plate that is rotatable around a fifth axis with respect to a seat cushion frame; and a leg bar unit that is supported to rotate around a third axis with respect to the sub-link and is supported to be rotatable around a fourth axis that is apart from the fifth axis by a prescribed distance with respect to the leg support plate. After a prescribed rotation angle of a flip action of the seat cushion, the leg bar unit rotates the sub-link in a direction opposite to the first rotation direction to allow the action to continue, maintains the distance by the rotation of the sub-link, and stores the leg support plate toward the seat cushion.

Description

Technical Field

[0001] This invention relates to a flip-up seat. Background Technology

[0002] Patent document 1 describes a structure in which a folding seat in a vehicle such as an automobile is folded laterally and stored in the side wall of the passenger compartment, wherein the leg part, which is raised in a way that supports the floor during use, rotates and is stored in the back of the folding seat in a way that folds down in conjunction with the folding action for storage.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent No. 5973586 Summary of the Invention

[0004] In the configuration described in Patent Document 1, the flip-up seat flips and rotates about a flip rotation axis set on one side in the width direction. This flip-up seat has a long connecting rod that is rotatably supported at its base on a first rotation axis located off-center from the flip rotation axis, and has an elongated hole at its front end. Furthermore, the leg members are rotatably supported in the seat frame by a second rotation axis, and one end of a short second rod that rotates integrally with the leg members is fixed to the second rotation axis. The other end of this second rod is buoyantly supported in the elongated hole of the connecting rod.

[0005] Thus, in the flip-up seat described in Patent Document 1, as the seat flips, the second rod is pulled by the connecting rod via an elongated hole that rotates on a different circular trajectory than the flip-up seat. As a result, the leg components are pulled by the connecting rod, rotated, and stored in the back of the flip-up seat.

[0006] In the structure described in Patent Document 1, the engaging portion of the second rod engages with the elongated hole of the connecting rod with a clearance, and maintains this clearance. Therefore, if vibrations are applied to the vehicle while the flip-up seat is in place, it is possible for the engaging portion of the second rod to come into contact with the end face of the elongated hole, causing noise, or for the leg components to slightly deviate from their position. There is room for improvement in this regard.

[0007] The purpose of this invention is to provide a flip-up seat that is less prone to abnormal noise or positional displacement in the foot components.

[0008] The flip-up seat of the embodiment includes: a seat cushion having a seat cushion frame supported relative to a part of the seat frame, i.e., a side frame, that rotates about a first axis between a use position and a folded position after flipping over from the use position; a secondary link having one end supported by the side frame for rotation about a second axis; a first force-applying member that applies force to the secondary link in a first rotational direction; a leg support plate that is rotatable relative to the seat cushion frame about a fifth axis, standing upright when the seat cushion is in the use position and folding down for storage when in the folded position; and a leg bar unit having one end supported at the other end of the secondary link for rotation about a third axis, and the other end supported for rotation about a fourth axis located in the leg support plate at a predetermined distance away from the fifth axis. After a predetermined rotation angle, the leg bar unit pulls the secondary link, causing the secondary link to rotate in a second rotation direction opposite to the first rotation direction. This allows the rotation action of flipping the seat cushion from the use posture to the storage posture to continue. The predetermined distance is maintained by the rotation of the secondary link in the second rotation direction, and the leg support plate is folded into the seat cushion.

[0009] Alternatively, the flip-up seat may also include a second force-applying component that applies force to the leg support plate in a direction that is upright relative to the seat cushion frame.

[0010] The first force-applying component can also be a torsion bar.

[0011] The second force-applying component can also be a disc spring.

[0012] Based on the above configuration, it is not easy for abnormal noises or positional displacement to occur in the leg components. Attached Figure Description

[0013] Figure 1 This is a perspective view taken from the upper right front, showing a schematic configuration of the seat frame of a flip-up seat as one aspect of the present invention.

[0014] Figure 2 It means Figure 1 The front view of the first rotating mechanism of the seat frame.

[0015] Figure 3 It means Figure 1 The front view of the second rotating mechanism of the seat frame.

[0016] Figure 4 It is used to describe the accompaniment Figure 1 The diagram shows the movement of the linkage mechanism for the flipping action of the folding seat and the folding action of the inner legs. Detailed Implementation

[0017] One embodiment of the flip-up seat of the present invention will be described using a flip-up seat 1 (hereinafter referred to as seat 1). In this example, the flip-up seat 1 is a seat mounted on a vehicle, and the up / down and front / back directions in the following description are determined by… Figure 1 The arrow shown is a specification.

[0018] In the examples described below, the means of transportation is a car, such as... Figure 1 As shown, the vehicle interior includes a floor FL and an inner wall SW serving as interior trim. Seat 1 is, for example, positioned on the left side of the third row. Seat 1 is positioned in a posture where the seat back SB is raised, allowing the occupant to sit comfortably. Figure 1 The posture is the same as the storage posture, where the seat back SB is laid down on the seat cushion SC (refer to arrow DR1) and the seat back SB is flipped inwards towards the side wall SW by about 90° in this state. Figure 4 Transition between positions P3 and P3 (see arrow DR2).

[0019] The seat 1 has an internal seat frame STf that forms a skeleton. The seat cushion SC has a seat cushion frame 11 housed internally as part of the seat frame STf, and a plate-shaped leg support 21 rotatably connected to the seat cushion frame 11 and erected from the bottom surface of the seat 1 in the use position. In the use position of the seat 1, the leg support 21 is fixed by its front leg portion 211 engaging with a locking part 81 on a track (not shown) laid on the floor FL. When the locking part 81 is released and the seat 1 is flipped, the leg support 21 rotates around its base in conjunction with the flipping action and is stored in the bottom surface of the seat 1. Figure 4 (Position P3).

[0020] The rotation of the leg support plate 21, which is linked to the flipping action of the seat 1, is achieved through the linkage action of the first rotation mechanism K1 and the second rotation mechanism. For example... Figure 1 As shown, the first rotating mechanism K1 is located on one side (left end) of the front width of the seat 1. The second rotating mechanism K2 is located on the other side (near the right end) of the front width of the seat 1. First, the first rotating mechanism K1 will be described.

[0021] (First rotating mechanism K1) like Figure 1 and Figure 2 As shown, regarding the first rotating mechanism K1, three axes CL11~CL13, extending in the front-rear direction and serving as the axis of rotation, are set at different positions. Axis CL11 is also called the first axis, axis CL12 is also called the second axis, and axis CL13 is also called the third axis. Because... Figure 2Since the view is from the front, the right direction on the paper becomes the left direction as indicated by the arrow, and the left and right directions in the description are explained according to the specified directions.

[0022] Regarding the three axes, axis CL12 is located to the lower left of axis CL11, and axis CL13 is located to the lower right of axis CL11. For example... Figure 2 As shown, the first rotating mechanism K1 is configured to have a side frame 82, a rotating bracket 13, a frame rod 14, a secondary connecting rod 3, a torsion bar 83, and a leg rod unit 22.

[0023] The side frame 82, located on the left side as part of the frame of the seat ST, has a tilting support 821 and a secondary link support 822. The tilting support 821 has a first shaft 821a at its right end, which supports the rotating bracket 13 rotatably about axis CL11 as shown by arrow DR3. The secondary link support 822 is located below the tilting support 821 and has a second shaft 822a that supports one end of the secondary link 3 rotatably about axis CL12 as shown by arrow DR4.

[0024] A frame rod 14, serving as a tubular component, is integrally fixed to the right end of the rotating bracket 13 via welding or other means. The frame rod 14 is a component constituting the seat cushion frame 11 of the seat cushion SC (see reference). Figure 1 ).

[0025] The secondary connecting rod 3 has a third shaft portion 3a at its lower right end, which supports one end of the connecting plate 222, i.e., the left end, allowing it to rotate freely about axis CL13 as shown by arrow DR5. At the right end of the connecting plate 222, the left end of the tubular leg 221 is integrally welded by the welding portion 2W. The other end of the leg 221 extends to the right, as shown... Figure 3 It is connected to the second rotating mechanism K2 as shown.

[0026] The end of the torsion bar 83, acting as the first force-applying component, abuts against the upper edge of the secondary connecting rod 3 with a downward force F83. That is, the secondary connecting rod 3 is always subjected to a downward force F83. Figure 2 Apply force in the counterclockwise direction (first rotation direction).

[0027] (Second rotating mechanism K2) like Figure 1 and Figure 3 As shown, regarding the second rotating mechanism K2, two axes CL21 and CL22, extending in the front-rear direction, are set at different positions as the axis of rotation. (Refer to...) Figure 3 The details are explained below. Axis CL21 is also called the fourth axis, and axis CL22 is also called the fifth axis.

[0028] like Figure 3As shown, the second rotating mechanism K2 is configured with a leg rod unit 22, a leg support plate 21, a leg bracket 15, and a coil spring 16 as a second force-applying component. The leg rod unit 22 connects the leg rod 221 and the connecting plate 222 (see reference). Figure 2 The rod-shaped component is formed by integrating the adjustment plate 223 with the adjustment plate 223.

[0029] The left end of the leg support 15 is fixed to the vicinity of the right end of the frame rod 14, which is connected to the first rotating mechanism K1, by welding or the like. The leg support 15 has a fourth shaft portion 151 with an axis CL21 extending in the front-rear direction as its axis and a leg spring support portion 152 provided slightly above and to the right of the fourth shaft portion 151.

[0030] The fourth shaft 151 rotatably supports one edge of the leg support plate 21. Figure 3 The area near the upper edge of the middle (refer to arrow DR6). Thus, the leg support plate 21 can... Figure 3 The seat 1 shown rotates between its upright position in use posture and its stowed position, which rotates approximately 90° counterclockwise around axis CL21.

[0031] A fifth shaft portion 21a is provided in the leg support plate 21 at a predetermined distance L21 from the fourth shaft portion 151. The fifth shaft portion 21a engages with an elongated hole 223a formed at one end (the right end in this example) of the adjustment plate 223, and is supported in such a way that it can move within the elongated hole 223a and rotate freely about the axis CL22 (see arrow DR61). The engagement shaft (not shown) of the adjustment plate 223 enters the elongated hole 221a, which extends a considerable distance along the extension direction at the right end of the leg rod 221, and is fixed by the fastener N2. The adjustment plate 223 is integrated with the leg rod 221 by being fixed in the elongated hole 221a. The elongated hole 221a is provided to absorb dimensional deviations of the various components, and the adjustment plate 223 and the leg rod 221 are fastened and fixed by the fastener N2 after adjusting the length of the connecting rod.

[0032] In the leg support 15, the leg spring support 152 protrudes forward (near the front of the paper), and the first arm 16a of the coil spring 16, formed at the smallest diameter end, engages with the groove of the leg spring support 152, preventing rotation of the small diameter side. On the other hand, the second arm 16b formed at the largest diameter end of the coil spring 16 applies force F16 from left to right, abutting against the fifth shaft 21a. As a result, the leg support plate 21 is always held upright. Rotation of the leg support plate 21 in the upright direction centered on the fourth shaft 151 is restricted, for example, by contact with a stop (not shown) formed in the leg support 15, etc. Thus, the upright position of the leg support plate 21 is determined.

[0033] If the seat cushion SC is rotated (flipped) from the use position to the storage position through the linkage of the first rotating mechanism K1 and the second rotating mechanism K2 described above, the leg support plate 21 will automatically rotate and be stored at the bottom of the seat cushion SC in the storage position. See also... Figure 4 The action of this linkage is explained.

[0034] Figure 4 This diagram schematically illustrates the linkage action of the first rotating mechanism K1 and the second rotating mechanism K2. It uses three positions P1-P3 of the seat cushion SC to represent the positions of axes CL21, CL22, and CL11-CL13, the positions of the connecting rods LK2 and LK14, and the posture of the secondary connecting rod 3. Connecting rod LK2 represents the leg rod unit 22 connecting axes CL13 and CL22, and connecting rod LK14 represents the component integrating the frame rod 14, leg support 15, and rotating support 13. Positions P1-P3 represent the rotational positions of the seat cushion SC; position P1 represents the position in the use posture, P3 represents the position in the storage posture, and P2 represents the intermediate position between positions P1 and P3, indicating the switching position where the secondary connecting rod 3 is rotated or not.

[0035] In addition, Figure 4 In the description of the linkage action, for convenience, it is stated that linkage LK2 connects axis CL13 and axis CL22. This means that the third shaft 3a corresponding to axis CL13 and the fifth shaft 21a corresponding to axis CL22 are connected. Similarly, it is stated that linkage LK14 connects axis CL11 and axis CL21. This means that the first shaft 821a corresponding to axis CL11 and the fourth shaft 151 corresponding to axis CL21 are connected.

[0036] At position P1, link LK14 connects axes CL11 and CL21 by a length equal to the distance between them, and link LK2 connects axes CL13 and CL22 by a length equal to the distance between them. When the seat cushion SC is lifted from position P1 as indicated by arrow DR7, link LK14 rotates around axis CL11, and link LK2 rotates around axis CL13. At this time, the positions of axes CL11 and CL13 are offset, so the trajectory of axis CL21 is different from that of axis CL22. Specifically, the position of axis CL13 is offset to the right relative to the position of axis CL11, and the position of axis CL22 is also offset to the right relative to the position of axis CL21. Therefore, initially, although the trajectory of axis CL21 is located inside the trajectory of axis CL22, with a certain degree of rotation, the inside and outside positions of the trajectories are reversed, and the trajectory of axis CL21 extends outside the trajectory of axis CL22, and the radial separation distance of these trajectories gradually increases. The position of the trajectory can be adjusted by fixing it in the leg unit 22 via the elongated hole 221a of the leg 221 and the adjustment plate 223.

[0037] In addition, during this rotation, the leg support plate 21 maintains an upright posture that extends approximately in the vertical direction, while the seat cushion SC gradually rises. Therefore, the angle θ between the leg support plate 21 and the seat cushion SC gradually decreases as the seat cushion SC rotates.

[0038] Here, if we consider the case where the seat cushion SC rotates approximately 90° while the position of axis CL13 remains unchanged, then after position P2, the separation distance between axis CL22 and the trajectory of axis CL21 along the virtual trajectory D shown by the dashed line further increases, reaching the virtual position PK22 at position P3. The distance L21K between this virtual position PK22 and axis CL21 is greater than the original distance L21 between axis CL21 and axis CL22. Therefore, if the position of axis CL13 remains unchanged as assumed, the seat cushion SC cannot be raised further than a certain angle to rotate.

[0039] Therefore, the first rotating mechanism K1 has a secondary connecting rod 3 capable of rotating about axis CL12, and axis CL13 is set on this secondary connecting rod 3. Thus, once the distance L between axis CL21 and axis CL22 can no longer be maintained as the seat cushion SC rotates and enters an angle region AR1 that must be larger than it, the force F83 (refer to) that overcomes the action of torsion bar 83 is used to overcome this force. Figure 2 The torque of the torque lifts the seat cushion SC (refer to arrow DR71). Consequently, the secondary link 3 rotates in a second direction opposite to the first rotation direction. Figure 2With clockwise rotation (refer to arrow DR8), the position of axis CL13 rises, thus maintaining distance L at distance L21, and the flipping rotation continues. This is because the torque generated by the force that rotates the seat cushion SC is greater than the torque of the downward force F83 applied to the secondary linkage 3 via torsion bar 83.

[0040] Conventionally, to allow rotation even when the distance L between axes CL21 and CL22 is greater than the initial distance L21, a sufficiently long elongated hole and a locking pin capable of moving within that hole are used to connect the leg rod 221 and the adjustment plate 223. This has become a major cause of noise and positional misalignment. In contrast, in a flip-up seat according to one embodiment of the present invention, the leg rod unit 22 and the secondary connecting rod 3 are connected in a manner that allows rotation about axis CL13. Therefore, the elongated hole 223a of the leg rod 221 only needs to be a short-length elongated hole capable of absorbing deviations during component molding and assembly, allowing for high-precision folding of the leg support plate 21, which is less prone to noise and positional misalignment. Thus, even when the seat 1 with the elongated hole 1 is folded up, vibrations are applied to the vehicle without causing noise or positional misalignment of the folded leg support plate 21.

[0041] This invention is not limited to the embodiments and order described above, and various modifications can be made without departing from the spirit of this invention.

[0042] The above configuration illustrates an example where the secondary link 3 begins to move midway through its rotation. However, it is also possible to make the lengths (distances) of link LK2 and link LK14 the same in the retracted position. In this case, the secondary link 3 can also be configured to begin moving midway from the retracted position to the usage position, and in the usage position, the secondary link 3 becomes the state after rotating against force F83.

[0043] The torsion bar 83, which serves as the first force-applying component, and the coil spring 16, which serves as the second force-applying component, are not limited to torsion bars or coil springs, but can also be other types of springs (coil springs, leaf springs, etc.).

[0044] Although the description of seat 1 showing it tilting towards the left inner wall SW of the vehicle compartment is provided, it can also tilt towards the right inner wall SW. The term "vehicle" includes not only automobiles and railway vehicles, but also flying bodies such as ships, airplanes, and drones; it refers to a mobile body for people to ride in and move. Furthermore, the directions up, down, left, right, front, and back mentioned above are merely examples provided for ease of explanation; the orientation of seat 1 relative to the vehicle is not specified and is free.

Claims

1. A flip-up seat, characterized in that, have: A seat cushion having a cushion frame supported as a side frame that rotates about a first axis between a use position and a storage position after being flipped over from the use position. The secondary connecting rod, one end of which is supported by the side frame, is able to rotate about a second axis; The first force-applying component applies a force to the secondary connecting rod in the first rotational direction; The leg support plate is rotatable about a fifth axis relative to the seat cushion frame, standing up when the seat cushion is in the use posture, and lying down and folding away when it is in the storage posture. as well as The leg unit has one end supported at the other end of the secondary link for rotation about a third axis, and the other end supported for rotation about a fourth axis located in the leg support plate at a predetermined distance from the fifth axis. After a predetermined rotation angle, the leg bar unit pulls the secondary link, causing the secondary link to rotate in a second rotation direction opposite to the first rotation direction. This allows the rotation action of flipping the seat cushion from the use posture to the storage posture to continue. The predetermined distance is maintained by the rotation of the secondary link in the second rotation direction, and the leg support plate is folded into the seat cushion.

2. The flip-up seat according to claim 1, characterized in that, It also has a second force-applying component that applies force to the leg support plate in a direction that causes the leg support plate to stand upright relative to the seat cushion frame.

3. The flip-up seat according to claim 1, characterized in that, The first force-applying component is a torsion bar.

4. The flip-up seat according to claim 2, characterized in that, The second force-applying component is a disc spring.

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