Vehicle seats

Abstract

To provide a vehicle seat whose position can be adjusted with a single operation. [Solution] A vehicle seat (1) of the present disclosure includes a link mechanism (30) that connects an upper frame (20) and a lower frame (22) on both sides in the vehicle width direction and that allows adjustment of the position of the upper frame (20) relative to the lower frame (22). The link mechanism (30) has a first link member (31) that has one end journaled to the rear of the lower frame (22) and the other end journaled to the front of the upper frame (20) so as to be slidable parallel to the floor surface, and a second link member (32) that has one end journaled to the front of the lower frame (22) so as to be slidable in a direction diagonal to the floor surface vertically, and the other end journaled to the rear of the upper frame (20). The first link member (31) and the second link member (32) are connected at a position where the two members intersect, and the connection point is located above a straight line connecting one end of the first link member (31) and above a straight line connecting one end of the second link member (32).

Description

[Technical Field]

[0001] The present disclosure relates to vehicle seats. [Background technology]

[0002] Conventionally, in vehicles such as trucks, vehicle seats have been known that have a link mechanism for adjusting the position of an upper frame between an upper frame on which a seat portion on which an occupant sits and a lower frame attached to the floor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-050096 Summary of the Invention [Problem to be solved by the invention]

[0004] This type of vehicle seat generally has a seat adjustment mechanism that allows an occupant (e.g., a driver) to adjust the seating position (i.e., seat height and fore-aft position) to suit their physique.

[0005] Fig. 1A is a diagram showing a seat position adjustment method for a general vehicle seat, and Fig. 1B is a diagram showing a seat position adjustment method set as a problem for the vehicle seat according to the present disclosure.

[0006] This type of seat adjustment mechanism typically allows the position of the seat to be adjusted in both the front-to-rear and up-to-down directions (see Figure 1A). In this case, the driver adjusts the position of the seat to the desired seating position by separately operating a first operating unit for adjusting the position in the front-to-rear direction and a second operating unit for adjusting the position in the up-to-down direction.

[0007] Such a seat adjustment mechanism is useful in that it allows fine adjustment of the seating position (i.e., seat height and fore-aft position of the seat). However, users (e.g., drivers) use vehicles in a variety of ways, and in vehicles such as trucks, some users adopt a usage pattern in which they move the seat each time they get in and / or out of the vehicle. These users have a demand for a system that allows them to adjust the seating position with a single operation, rather than operating the fore-aft and up-down directions separately (see FIG. 1B).

[0008] According to the findings of the inventors of the present application, the seating position, or driving position, usually depends on the physique of the driver. Specifically, a person with a large physique sits in a position that is higher and further back than the steering wheel (see A1 in FIG. 1B), while a person with a small physique sits in a position that is lower and further forward than the steering wheel (see A2 in FIG. 1B). In other words, if a configuration can be realized in which the seat can be moved between a lower position in the front of the vehicle (see A2 in FIG. 1B) and an upper position in the rear (see A1 in FIG. 1B) (DD direction in FIG. 1B), the above-mentioned demands can be met.

[0009] The present invention has been made in view of the above-mentioned problems, and has an object to provide a vehicle seat whose position can be adjusted with a single operation. [Means for solving the problem]

[0010] The main invention that solves the above-mentioned problems is: an upper frame on which the seat portion is placed; a lower frame provided on a floor surface and disposed opposite the upper frame; a link mechanism that connects the upper frame and the lower frame on both sides in the vehicle width direction and enables adjustment of the position of the upper frame relative to the lower frame; Equipped with The link mechanism includes: a first link member having one end as a fixed end pivotally supported on the rear part of the lower frame and the other end as a movable end pivotally supported on the front part of the upper frame so as to be slidable parallel to the floor surface; a second link member having one end which is a movable end pivotally supported on the front part of the lower frame so as to be slidable in a vertically oblique direction relative to the floor surface, and the other end which is a fixed end pivotally supported on the rear part of the upper frame; and The first link member and the second link member are rotatably connected at a position where both members intersect, and the connection point is located above a straight line connecting the one end and the other end of the first link member and above a straight line connecting the one end and the other end of the second link member. A vehicle seat.

[0011] In other respects, an upper frame on which the seat portion is placed; a lower frame provided on a floor surface and disposed opposite the upper frame; a link mechanism that connects the upper frame and the lower frame on both sides in the vehicle width direction and enables adjustment of the position of the upper frame relative to the lower frame; Equipped with The link mechanism includes: a first link member having one end as a fixed end pivotally supported on the front part of the upper frame and the other end as a movable end pivotally supported on the rear part of the lower frame so as to be slidable parallel to the floor surface; a second link member having one end which is a movable end pivotally supported on the rear part of the upper frame so as to be slidable in a vertically oblique direction relative to the floor surface, and the other end which is a fixed end pivotally supported on the front part of the lower frame; and The first link member and the second link member are rotatably connected at a position where both members intersect, and the connection point is located below a straight line connecting the one end and the other end of the first link member and below a straight line connecting the one end and the other end of the second link member. A vehicle seat. [Effects of the Invention]

[0012] According to the vehicle seat of the present invention, the position can be adjusted with a single operation. [Brief explanation of the drawings]

[0013] [Figure 1A] A diagram showing how to adjust the seat position of a typical vehicle seat [Figure 1B] FIG. 10 is a diagram showing a seat position adjustment method set as a problem in a vehicle seat according to the present disclosure. [Figure 2] 1 is a diagram showing an overall configuration of a vehicle seat according to an embodiment of the present invention; [Figure 3] The figure shows the state of each part of a vehicle seat when the seat height is at its lowest position (top figure) and at its highest position (bottom figure). [Figure 4] FIG. 1 is a diagram showing a configuration of an operating unit for a vehicle seat according to an embodiment of the present invention; [Figure 5] FIG. 10 is a diagram illustrating the behavior of the link mechanism during seat position adjustment according to an embodiment of the present invention. [Figure 6] FIG. 10 is a diagram showing the behavior of the link mechanism according to Reference Example 1 when adjusting the seat position. [Figure 7] FIG. 10 is a diagram showing the behavior of the link mechanism according to Reference Example 2 when adjusting the seat position. [Figure 8] FIG. 1 is a diagram showing an overall configuration of a vehicle seat according to a modified example of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functions are designated by the same reference numerals, and redundant description will be omitted.

[0015] In each figure, a common Cartesian coordinate system (X, Y, Z) is shown to clarify the positional relationship of each component. In the following description, the positive direction of the X axis represents the front direction of the vehicle (hereinafter abbreviated as "forward direction"), the positive direction of the Y axis represents the right side direction of the vehicle, and the positive direction of the Z axis represents the upward direction of the vehicle (hereinafter abbreviated as "upward direction").

[0016] As described above, the vehicle seat according to the present disclosure has a basic design specification that the position of the seat portion can be adjusted between a lower front position and an upper rear position of the vehicle. Hereinafter, this adjustment direction is defined as a "vertical diagonal direction" with respect to the floor surface, and is also referred to as the "DD direction" (see the DD direction in Figure 1B).

[0017] <Vehicle seat configuration> The configuration of a vehicle seat according to one embodiment of the present invention (hereinafter referred to as "vehicle seat 1") will be described with reference to FIGS. 2 to 4. FIG.

[0018] FIG. 2 is a diagram showing the overall configuration of the vehicle seat 1. As shown in FIG.

[0019] 3A and 3B are diagrams showing the states of the various parts of the vehicle seat 1 when the seat height is at the lowest position (upper diagram) and when the seat height is at the highest position (lower diagram). Note that the right side of Fig. 3 illustrates the state of the link mechanism 30, with the guide portions 22L of the upper frame 20 and the lower frame 22 omitted.

[0020] FIG. 4 is a diagram showing the configuration of the operating unit 40 of the vehicle seat 1. As shown in FIG.

[0021] The vehicle seat 1 is installed in a vehicle (for example, a truck) and is a seat for a passenger (for example, a driver) to sit in. The vehicle seat 1 is installed on a floor F of the vehicle cab.

[0022] The vehicle seat 1 includes a seat portion 10, an upper frame 20, a lower frame 22, a link mechanism 30, and an operating portion 40.

[0023] The seat 10 has a seating portion 10a and a backrest 10b. The seat 10 is placed on an upper frame 20. The backrest 10b is connected to the rear of the seating portion 10a. The seat position of the seat 10 (referred to as the "seating position of the seating portion 10a"; the same applies hereinafter) can be adjusted along a vertically diagonal direction (direction DD in FIG. 2) relative to the floor surface F.

[0024] The upper frame 20 supports the placed seat portion 10 from below. The upper frame 20 is made of, for example, a plate-shaped or frame-shaped member.

[0025] The upper frame 20 is disposed parallel to the floor surface F via the lower frame 22 and the link mechanism 30 (first link member 31, second link member 32). The upper frame 20 is disposed so as to extend substantially parallel to the floor surface F in the front-to-rear direction of the vehicle.

[0026] The upper frame 20 has a slide rail 20L at the front that extends in the fore-and-aft direction of the vehicle, and the slide rail 20L supports the upper end 31b (shown as 31b in the figure) of the first link member 31 so that it can slide and rotate. Furthermore, the upper frame 20 supports, at its rear portion, an upper end portion 32b of a second link member 32 rotatably while keeping the upper end portion 32b in a fixed position.

[0027] The lower frame 22 is a frame fixed to the floor surface F. The lower frame 22 faces the upper frame 20. The lower frame 22 is made of, for example, a plate-shaped or frame-shaped member. The lower frame 22 is disposed so as to extend substantially parallel to the floor surface F in the front-to-rear direction of the vehicle.

[0028] The lower frame 22 has a guide portion 22L at its front portion, which axially supports the lower end portion 32a of the second link member 32 so that the lower end portion 32a is slidably and rotatably moved. More specifically, the guide portion 22L guides the lower end portion 32a of the second link member 32 so that the lower end portion 32a describes a parabolic trajectory in a vertically oblique direction (direction DD in FIG. 2) relative to the floor surface F. The guide portion 22L is formed, for example, by a bracket fixed to the lower frame 22, and axially supports the lower end portion 32a of the second link member 32 so that the lower end portion 32a is slidably and rotatably moved by a guide groove formed in the bracket. Furthermore, the lower frame 22 supports, at its rear portion, a lower end portion 31a of a first link member 31 rotatably while keeping the lower end portion 31a fixed in position.

[0029] Furthermore, since the upper frame 20 is connected to the lower frame 22 only by the first link member 31 and the second link member 32, when the seat position is adjusted, the upper frame 20 follows a trajectory that corresponds to the behavior of the first link member 31 and the second link member 32.

[0030] The link mechanism 30 connects the upper frame 20 and the lower frame 22 on both sides in the vehicle width direction, and is a mechanism that makes it possible to adjust the position of the upper frame 20 relative to the lower frame 22.

[0031] The link mechanism 30 has a first link member 31 and a second link member 32 that are arranged to intersect with each other and connect the upper frame 20 and the lower frame 22. Here, the first link member 31 is arranged to extend from the rear of the lower frame 22 toward the front of the upper frame 20. In addition, the second link member 32 is arranged to extend from the front of the lower frame 22 toward the rear of the upper frame 20. The first link member 31 and the second link member 32 are rotatably connected at the position where both members intersect.

[0032] The lower end 31a of the first link member 31 is a fixed end that is pivotally supported on the rear part of the lower frame 22. The lower end 31a of the first link member 31 is, for example, connected by a pin to the rear part of the lower frame 22, thereby forming a fixed end that is fixed in a rotatable state.

[0033] Additionally, the upper end 31b of the first link member 31 is guided by the slide rail 20L and serves as a movable end that is pivotally supported on the upper frame 20 in a state in which it is slidable and rotatable in the longitudinal direction of the vehicle parallel to the floor surface F. For example, a roller member is provided on the upper end 31b of the first link member 31, and as this roller member moves along the slide rail 20L, the upper end 31b of the first link member 31 is guided by the slide rail 20L and is slidable and rotatable in the longitudinal direction of the vehicle parallel to the floor surface F.

[0034] On the other hand, the lower end 32a of the second link member 32 is guided by the guide portion 22L and serves as a movable end pivotally supported on the lower frame 22 so as to be slidable and rotatable in a parabolic trajectory along a diagonal direction vertical to the floor surface F (and in the vehicle longitudinal direction). More specifically, the lower end 32a of the second link member 32 is provided with, for example, a roller member 32aa (see FIG. 3), and this roller member 32aa is movable along the guide portion 22L of the lower frame 22, so that the lower end 32a of the second link member 32 is guided by the guide portion 22L and is slidable and rotatable in a diagonal direction vertical to the floor surface F (direction DD in FIG. 2). More specifically, the lower end 32a of the second link member 32 is guided by the guide portion 22L and slides along a parabolic trajectory.

[0035] Additionally, the upper end portion 32b of the second link member 32 is a fixed end (indicated as 32b in the drawing) that is pivotally supported on the rear portion of the upper frame 20. The upper end portion 32b of the second link member 32 is connected to the rear portion of the upper frame 20 by, for example, a pin, and is thereby a fixed end that is fixed in a rotatable state.

[0036] In the link mechanism 30 according to this embodiment, the first link member 31 is connected to the second link member 32 above a line connecting one end of the first link member 31 and the other end of the second link member 32, and the second link member 32 is connected to the first link member 31 above a line connecting one end of the second link member 32. In other words, the connection point 30X between the first link member 31 and the second link member 32 is above a line connecting one end of the first link member 31 and the other end of the second link member 32. The first link member 31 and the second link member 32 are connected by a pin at the connection point 30X, for example, so as to be rotatable relative to each other.

[0037] This configuration is one of the devices for enabling the seat portion 10 to move in a vertically oblique direction (direction DD in FIG. 2) relative to the floor surface F (details will be described later). In order to achieve this configuration, the first link member 31 and the second link member 32 each have a triangular or V-shape with the connection point 30X between the first link member 31 and the second link member 32 as the apex.

[0038] Here, it is desirable that the interior angle at the apex of each of the triangle or V-shape of the first link member 31 and the second link member 32 is set to be equal to or greater than 1 degree and equal to or less than 30 degrees, thereby enabling the seat unit 10 to move along an ideal trajectory in a diagonal direction perpendicular to the floor surface F (direction DD in FIG. 2).

[0039] Furthermore, if the interior angle is less than 1 degree, the first link member 31 and the second link member 32 will be approximately linear, resulting in a configuration in which the seat portion 10 will only move in the vertical direction (see Figure 6).

[0040] Furthermore, if the interior angle is greater than 30 degrees, the upper end 31b (movable end) of the first link member 31 and the lower end 32a (movable end) of the second link member 32 will move significantly in the minus X direction when the seat position is raised, and the rising angle of the first link member 31 and / or the second link member 32 will become excessively large. As a result, depending on the seating position of the occupant, an imbalance will occur between the stress applied to the first link member 31 and the stress applied to the second link member 32. In addition, in this state, the connection point (connection point 30X) between the first link member 31 and the second link member 32 will protrude upward from the upper frame 20.

[0041] The ideal trajectory (i.e., adjustable position) of the seat unit 10 when adjusting the seat position is, for example, a vertically oblique direction of 20 degrees or more and 50 degrees or less with respect to the floor surface F (see trajectory line LP in Figures 5A to 5D described later).

[0042] 2 to 4 only show the configuration of the vehicle seat 1 as viewed from the left side in the vehicle width direction, but the vehicle seat 1 also has a configuration similar to that shown in Figures 2 to 4 on the right side in the vehicle width direction. That is, the link mechanisms 30 are disposed on both sides of the vehicle seat 1 in the vehicle width direction, and support the seat portion 10 (and the upper frame 20) on both sides of the vehicle seat 1 in the vehicle width direction.

[0043] The operating unit 40 is an operating means for an occupant (driver) to adjust the position of the vehicle seat 1. In response to an operation by the occupant, the operating unit 40 swings the link mechanism 30 up and down, thereby making it possible to adjust the position of the upper frame 20 relative to the lower frame 22.

[0044] The operation unit 40 may have any known configuration, but here it is made up of an operation knob 41, an operation transmission unit 42, and a ratchet mechanism 43.

[0045] The operation knob 41 has a lever shape and can be rotated upward and / or downward by operation by the occupant. The operation transmission unit 42 transmits the rotational power of the operation knob 41 to the ratchet mechanism 43. The operation transmission unit 42 transmits the rotational power transmitted via a cable to the ratchet mechanism 43.

[0046] The ratchet mechanism 43 is rotatable upon receiving rotational power from the operation transmission unit 42. The ratchet mechanism 43 is connected to a support shaft (rotation shaft 31a) at the rotatable lower end of the first link member 31, and sets the rise angle of the first link member 31 so that it becomes an angle corresponding to the rotation position of the ratchet mechanism 43. In other words, by rotating the operation knob 41, the ratchet mechanism 43 can increase or decrease the rise angle of the first link member 31 in predetermined increments. After the rotation operation of the operation knob 41 is completed, the ratchet mechanism 43 locks the support shaft (rotation shaft 31a) of the first link member 31, and the height of the entire seat after it has been raised or lowered is maintained.

[0047] <Behavior of vehicle seats when adjusting their position> Next, the behavior of the vehicle seat 1 according to this embodiment when adjusting the seat position will be described.

[0048] FIG. 5 is a diagram showing the behavior of the link mechanism 30 according to this embodiment when adjusting the seat position.

[0049] Fig. 6 is a diagram showing the behavior of the link mechanism 30 according to Reference Example 1 when adjusting the seat position. Fig. 7 is a diagram showing the behavior of the link mechanism 30 according to Reference Example 2 when adjusting the seat position. The link mechanisms 30 according to Reference Examples 1 and 2 are reference examples for facilitating understanding of the behavior of the link mechanism 30 according to this embodiment when adjusting the seat position, and have configurations in which only a portion of the configuration of the link mechanism 30 according to this embodiment is changed.

[0050] Figures 5A to 5D, 6A to 6B, and 7A to 7D show the behavior of each part in chronological order when the seat position of the seat portion 10 (i.e., the seating position of the seating portion 10a) is moved from the lowest position to the highest position.

[0051] 5, 6, and 7 show a simplified model of the link mechanism 30. The symbols in Fig. 5, 6, and 7 represent the trajectories of the following points. LP: trajectory of the seat position of the seat portion 10 (P0 is the seating position of the seat portion 10a) L1: Track of the lower end 32a of the second link member 32 L2: Track of the front end of the upper frame 20 L3: Track of the rear end of the upper frame 20

[0052] As described above, in the vehicle seat 1 according to the prior art, when adjusting the seat position of the seat portion 10, the occupant has to separately operate the adjustment mechanisms that enable adjustment in the front-to-rear direction and the up-to-down direction. This configuration is not necessarily convenient for some users.

[0053] From this perspective, the vehicle seat 1 according to this embodiment is characterized in that it is configured so that the seat portion 10 as a whole can be moved in a vertically diagonal direction relative to the floor surface F (i.e., in the DD direction in Figure 2) while the seating portion 10a of the seat portion 10 is kept parallel to the floor surface F, in order to realize a configuration that allows the seat position of the seat portion 10 to be adjusted with a single operation.

[0054] To achieve this function, the link mechanism 30 according to this embodiment has the following two distinctive features: (1) the first link member 31 is connected to the second link member 32 above a line connecting one end of the first link member 31 and the other end of the second link member 32, and the second link member 32 is connected to the first link member 31 above a line connecting one end of the second link member 32, and (2) the lower end 32a of the second link member 32 is guided by the guide portion 22L and attached to the lower frame 22 in a state where it can slide and rotate in a diagonal direction vertical to the floor surface F (i.e., the direction DD in FIG. 2).

[0055] The link mechanism 30 according to Reference Example 1 differs from the link mechanism 30 according to this embodiment in that it does not have the configurations (1) and (2) described above. That is, in the link mechanism 30 according to Reference Example 1, the first link member 31 and the second link member 32 are configured as linear link members. The first link member 31 and the second link member 32 are connected by a pin at approximately their midpoints. The link mechanism 30 according to Reference Example 1 is the same as the link mechanism 30 employed in a vehicle seat 1 according to the prior art, and is configured so that the seat portion 10 can move up and down relative to the floor surface F.

[0056] The link mechanism 30 according to Reference Example 2 has only the configuration (1) above, but differs from the link mechanism 30 according to the present embodiment in that it is a link mechanism 30 that does not have the configuration (2). Because the link mechanism 30 according to Reference Example 2 has the configuration (1) above, the seat unit 10 can move in a vertically oblique direction (i.e., the DD direction in FIG. 2) relative to the floor surface F. However, because the link mechanism 30 according to Reference Example 2 does not have the configuration (2), the seat unit 10 is inclined relative to the floor surface F when the seat position is adjusted.

[0057] First, the behavior of the link mechanism 30 according to the first reference example when the seating position is raised will be considered (see FIG. 6).

[0058] In the link mechanism 30 according to Reference Example 1, the first link member 31 and the second link member 32 are disposed symmetrically with respect to the connection point 30X. Therefore, when the seating position is raised, the upper end 31b of the first link member 31 and the lower end 32a of the second link member 32 both slide from the +X direction to the -X direction while maintaining the same X coordinate position. As a result, in the link mechanism 30 according to Reference Example 1, the seat position of the seat unit 10 moves only in the up-down direction (±Z directions) while the seat unit 10 is parallel to the floor surface F.

[0059] It should be noted that here, the load vectors acting from above on the first link member 31 and the second link member 32 are considered to be approximately the same, with only the downward vertical (-Z direction) component being the same (the same applies to FIGS. 5 and 7). This assumption is reasonable because the vehicle seat 1 according to this embodiment is designed so that the rising angle of the first link member 31 and / or the second link member 32 is not excessively large (the interior angle at the apex of the triangle or V-shape of each of the first link member 31 and the second link member 32 is 1 degree or more and 30 degrees or less).

[0060] Next, the behavior of the link mechanism 30 according to the second reference example when the seating position is raised will be considered (see FIG. 7).

[0061] In the link mechanism 30 of reference example 2, the first link member 31 is connected to the second link member 32 above the straight line connecting one end of the first link member 31 to the other end thereof, and the second link member 32 is connected to the first link member 31 above the straight line connecting one end of the second link member 32 to the other end thereof.

[0062] In the link mechanism 30 according to Reference Example 2, when the seating position is raised, both the upper end 31b of the first link member 31 and the lower end 32a of the second link member 32 slide from the +X direction to the −X direction, as in the link mechanism 30 according to Reference Example 1. However, in the link mechanism 30 according to Reference Example 2, due to the arrangement and design of the connection point 30X, the amount of movement of the upper end 31b of the first link member 31 toward the −X side per unit rise angle of the first link member 31 is greater than the amount of movement of the lower end 32a of the second link member 32 toward the −X side. Therefore, in the link mechanism 30 according to Reference Example 2, when the seating position is raised, the seat position of the seat unit 10 also moves toward the −X side, while the front end of the upper frame 20 faces upward (i.e., the seat unit 10 is inclined with respect to the floor surface F during seat position adjustment).

[0063] Next, the behavior of the link mechanism 30 according to this embodiment when the seating position is raised will be considered (see FIG. 5).

[0064] In the link mechanism 30 according to this embodiment, as described above, "(1) the first link member 31 is connected to the second link member 32 above the line connecting its one end to the other end, and the second link member 32 is connected to the first link member 31 above the line connecting its one end to the other end," and "(2) the lower end 32a of the second link member 32 is guided by the guide portion 22L and is attached to the lower frame 22 in a state in which it can slide and rotate along a vertically diagonal direction (i.e., the DD direction in Figure 2) relative to the floor surface F."

[0065] That is, in the link mechanism 30 according to this embodiment, when the seating position is raised, the lower end 32a of the second link member 32 slides from the +X direction to the -X direction while moving in the +Z direction, unlike the link mechanism 30 according to Reference Example 2. Therefore, in the link mechanism 30 according to this embodiment, when the seating position is raised, the upper end 32b of the second link member 32 (i.e., the rear end of the upper frame 20) also moves in the +Z direction in accordance with the movement of the lower end 32a of the second link member 32.

[0066] Therefore, when raising the seating position, in the link mechanism 30 of this embodiment, the upper frame 20 (i.e., the seat portion 10) moves from a lower front position to an upper rear position (i.e., in the DD direction in Figure 2) of the vehicle while maintaining a parallel state with the floor surface F.

[0067] Although not explained here, the operation of raising the seating position is achieved, for example, in the vehicle seat 1 according to this embodiment, by operating the operating unit 40 to change the tilt angle of the first link member 31.

[0068] [effect] As described above, the vehicle seat according to this embodiment has: an upper frame on which the seat portion is placed; a lower frame provided on a floor surface and disposed opposite the upper frame; a link mechanism that connects the upper frame and the lower frame on both sides in the vehicle width direction and enables adjustment of the position of the upper frame relative to the lower frame; Equipped with The link mechanism includes: a first link member having one end as a fixed end pivotally supported on the rear part of the lower frame and the other end as a movable end pivotally supported on the front part of the upper frame so as to be slidable parallel to the floor surface; a second link member having one end which is a movable end pivotally supported on the front part of the lower frame so as to be slidable in a vertically oblique direction relative to the floor surface, and the other end which is a fixed end pivotally supported on the rear part of the upper frame; and The first link member and the second link member are rotatably connected at the position where the two members intersect, and the connection point is located above a straight line connecting the one end and the other end of the first link member and above a straight line connecting the one end and the other end of the second link member.

[0069] According to the vehicle seat of this embodiment, when adjusting the seat position, the seat portion of the seat can be moved in a direction diagonal to the floor (i.e., the DD direction in FIG. 2) while keeping the seating portion of the seat parallel to the floor. This makes it possible to adjust the seating position to your preference with a single operation.

[0070] In addition, this configuration prevents the rising angle of the first link member and the second link member from becoming excessively large when adjusting the seat position (when the seat is raised), and also reduces the amount of movement of the upper end (movable end) of the first link member and the lower end (movable end) of the second link member in the minus X direction. This makes it possible to prevent an imbalance between the stress applied from the seat to the first link member and the stress applied to the second link member, or a situation in which stress is concentrated on one side.

[0071] <Modification> In the vehicle seat 1, even if the link mechanism 30 is configured upside down and left to right, it can still perform the same operation as the vehicle seat 1 according to the above embodiment.

[0072] FIG. 8 is a diagram showing the overall configuration of a vehicle seat 1 according to a modified example of the present invention.

[0073] Similar to the link mechanism 30 of the above embodiment, the link mechanism 30 of this modified example has a first link member 31 and a second link member 32 that connect the upper frame 20 and the lower frame 22 on both sides in the vehicle width direction and enable adjustment of the position of the upper frame 20 relative to the lower frame 22.

[0074] However, the first link member 31 in this modified example has an upper end 31a which is a fixed end pivoted to the front part of the upper frame 20, and a lower end 31b which is a movable end pivoted to the rear part of the lower frame 22 so as to be able to slide parallel to the floor surface F.

[0075] In addition, the second link member 32 in this modified example has a lower end 32b which is a fixed end pivotally supported on the front part of the lower frame 22, and an upper end 32a which is a movable end pivotally supported on the rear part of the upper frame 20 so as to be able to slide in a vertically diagonal direction (i.e., in the DD direction) relative to the floor surface F.

[0076] In the vehicle seat 1 according to this modification, the guide portion 22L is disposed at the rear of the upper frame 20 to guide the movement of the upper end portion 32a of the second link member 32 in a parabolic curve. The configuration of the guide portion 22L itself is the same as that according to the above embodiment. That is, the guide portion 22L is formed, for example, by a bracket fixed to the upper frame 20. The guide portion 22L supports the upper end portion 32a of the second link member 32 slidably and rotatably in a vertically oblique direction (i.e., the DD direction) relative to the floor surface F using a guide groove formed in the bracket.

[0077] In the link mechanism 30 of this modified example, the first link member 31 and the second link member 32 are rotatably connected at the position where the two members intersect, and the connection point 30X is located below the straight line connecting the upper end 31a and lower end 31b of the first link member 31, and below the straight line connecting the upper end 32a and lower end 32b of the second link member 32.

[0078] According to the above-described configuration, in the vehicle seat 1 of this modified example, as in the vehicle seat 1 of the above-described embodiment, when the seat position is adjusted, the upper frame 20 (i.e., the seat portion 10) moves from a lower front position to an upper rear position (i.e., in the DD direction in Figure 8) while remaining parallel to the floor surface F.

[0079] This makes it possible to realize a vehicle seat 1 that allows the seating position to be adjusted to a preferred position with a single operation.

[0080] Although specific examples of the present invention have been described above in detail, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and alterations of the specific examples exemplified above. [Industrial Applicability]

[0081] According to the vehicle seat of the present invention, the position can be adjusted with a single operation. [Explanation of symbols]

[0082] 1. Vehicle seat 10 Seat section 10a Seating area 20 Upper Frame 20L slide rail 22 Lower frame 22L Guide section 30 Link mechanism 30X Connection Points 31 first link member 31a One end (fixed end) of the first link member 31b: the other end (movable end) of the first link member 32 second link member 32a One end (movable end) of the second link member 32b: the other end (fixed end) of the second link member 40 Control section 41 Control knob 42 Operation transmission unit 43 Ratchet mechanism F Floor

Claims

1. an upper frame on which the seat portion is placed; a lower frame provided on a floor surface and disposed opposite the upper frame; a link mechanism that connects the upper frame and the lower frame on both sides in the vehicle width direction and enables adjustment of the position of the upper frame relative to the lower frame; Equipped with The link mechanism includes: a first link member having one end as a fixed end pivotally supported on the rear part of the lower frame and the other end as a movable end pivotally supported on the front part of the upper frame so as to be slidable parallel to the floor surface; a second link member having one end which is a movable end pivotally supported on the front part of the lower frame so as to be slidable in a vertically oblique direction relative to the floor surface, and the other end which is a fixed end pivotally supported on the rear part of the upper frame; and The first link member and the second link member are rotatably connected at a position where both members intersect, and the connection point is located above a straight line connecting the one end and the other end of the first link member and above a straight line connecting the one end and the other end of the second link member. Vehicle seat.

2. the lower frame has a guide portion that pivotally supports the one end of the second link member, The guide portion guides the one end of the second link member so as to trace a parabolic trajectory in a vertically oblique direction relative to the floor surface. The vehicle seat according to claim 1 .

3. the first link member and the second link member each have a V-shape or a triangular shape with a connection point between the first link member and the second link member as an apex, The interior angle at the apex is greater than or equal to 1 degree and less than or equal to 30 degrees. The vehicle seat according to claim 1 .

4. an upper frame on which the seat portion is placed; a lower frame provided on a floor surface and disposed opposite the upper frame; a link mechanism that connects the upper frame and the lower frame on both sides in the vehicle width direction and enables adjustment of the position of the upper frame relative to the lower frame; Equipped with The link mechanism includes: a first link member having one end as a fixed end pivotally supported on the front part of the upper frame and the other end as a movable end pivotally supported on the rear part of the lower frame so as to be slidable parallel to the floor surface; a second link member having one end which is a movable end pivotally supported on the rear part of the upper frame so as to be slidable in a vertically oblique direction relative to the floor surface, and the other end which is a fixed end pivotally supported on the front part of the lower frame; and The first link member and the second link member are rotatably connected at a position where both members intersect, and the connection point is located below a straight line connecting the one end and the other end of the first link member and below a straight line connecting the one end and the other end of the second link member. Vehicle seat.

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