Easy chair

Abstract

To provide a vehicle seat which can suppress a link from being deformed and damaged when large load is applied to a cushion frame.SOLUTION: An attitude change mechanism 11 of a vehicle seat is given in which a truss structure is constituted by a first link 12, a second link 13 and a male screw bar 14. Thereby, bending moment does not occur as a principle in the first link 12, the second link 13 and the male screw bar 14. The attitude change mechanism 11 can suppress the first link 12, the second link 13 and the male screw bar 14 from being deformed and damaged by the bending moment when large load is applied to a cushion frame.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to an easy chair in which the posture of a cushion frame can be changed. [Background technology]

[0002] For example, in the vehicle seat described in Patent Document 1, the lower end of a first link is rotatably connected to a fixed bracket fixed to a movable rail of a sliding device, one end of a second link is rotatably connected to the upper end of the first link, and the other end of the second link is rotatably connected to a cushion frame, and the posture of the cushion frame is changed by changing the angle between the first link and the second link using an actuator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] China Utility Model No. 218892464 Summary of the Invention [Problem to be solved by the invention]

[0004] In the vehicle seat described in Patent Document 1, the position of the cushion frame is changed by changing the angle between the first link and the second link using an actuator. Therefore, when a large load acts on the cushion frame, a large bending moment is likely to be generated in the first link and the second link.

[0005] Therefore, in the vehicle seat described in Patent Document 1, when a large load acts on the cushion frame, the first link and the second link may be deformed and damaged. The present disclosure discloses an example of an easy chair in consideration of the above point. [Means for solving the problem]

[0006] The easy chair preferably comprises, for example, a cushion frame (7) and a position-changing mechanism (11) for displacing the cushion frame (7) between a comfortable position in which the front end side of the cushion frame (7) is raised compared to the rear end side and a normal position in which the front end side is lowered compared to the comfortable position, the position-changing mechanism (11) having a first link (12), a second link (13), a male threaded rod (14) and an electric motor (15) for rotating a nut engaging with the male threaded rod (14).

[0007] One longitudinal end side of the first link (12) is rotatably connected to the fixed bracket (93A), the other longitudinal end side of the first link (12) is rotatably connected to one longitudinal end side of the second link (13), the other longitudinal end side of the second link (13) is rotatably connected to one longitudinal end side of the male threaded rod (14), and the electric motor (15) is rotatably supported by the first link (12) or the fixed bracket (93A).

[0008] Furthermore, it is preferable that the figure connecting the support point (C4) of the electric motor (15), the first connecting point (C1), and the second connecting point (C2) always form a triangle, and the cushion frame (7) is connected to the second link (13). The first connecting point (C1) is the connecting point between the first link (12) and the second link (13). The second connecting point (C2) is the connecting point between the second link (13) and the male threaded rod (14).

[0009] As a result, in the position change mechanism (11) for the easy chair, a truss structure is formed by the first link (12), the second link (13), and the male threaded rod (14). Therefore, in principle, no large bending moment is generated in the first link (12), the second link (13), and the male threaded rod (14).

[0010] Therefore, with this posture change mechanism (11), when a large load acts on the cushion frame (7), deformation and damage to the first link (12), the second link (13) and the male threaded rod (14) due to bending moment can be suppressed.

[0011] The easy chair may have the following configuration, for example. That is, it is desirable that the connection point (C3) between the second link (13) and the cushion frame (7) is located between the first connection point (C1) and the second connection point (C2) of the second link (13).

[0012] This prevents the force for displacing the male threaded rod (14) and the axial force acting on the male threaded rod (14) from becoming excessively large, and increases the amount of upward displacement of the cushion frame (7).

[0013] The cushion frame (7) has a first side frame (71) arranged at one end in the width direction and extending in the front-rear direction, a second side frame (72) arranged at the other end in the width direction and extending in the front-rear direction, and a connecting member (73) extending in the width direction and connecting the first side frame (71) and the second side frame (72). The posture-changing mechanism (11) is arranged on the first side frame (71) side, and a third link (16), a fourth link (17) and a second fixed bracket (93B) are provided on the second side frame (72) side. One longitudinal end side of the third link (16) is rotatably connected to the second fixed bracket (93B), the other longitudinal end side of the third link (16) and one longitudinal end side of the fourth link (17) are rotatably connected, and it is desirable that the second link (13) and the fourth link (17) are configured to move as a single unit with the connecting member (73).

[0014] As a result, even if a large load acts on the second side frame (72), the energy of the load is also transmitted to the first side frame (71) via the connecting member (73). Therefore, the load is dispersed, and sufficient rigidity can be ensured.

[0015] The electric motor (15) is supported by the first link (12), and further, it is desirable that the support point (C4) is located on the fixed bracket (93A) side of the midpoint of the line segment connecting the first connection point (C1) and the connection point (C5) between the first link (12) and the fixed bracket (93A).

[0016] As a result, even if the male threaded rod 14 is significantly displaced in the axial direction, the center of gravity of the electric motor 15 is prevented from being significantly displaced in the vertical direction, and therefore the electric motor 15, which is an item with a relatively large mass, is prevented from being significantly displaced.

[0017] Furthermore, when the connection point between the second link (13) and the cushion frame (7) is the third connection point (C3), it is desirable that in the normal posture, the first connection point (C1) is located above the third connection point (C3), and in the comfortable posture, the first connection point (C1) is located below the third connection point (C3).

[0018] Incidentally, the symbols in the above parentheses are examples showing the corresponding relationship with the specific configurations etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations etc. shown by the symbols in the above parentheses. [Brief description of the drawings]

[0019] [Figure 1] 1 is a diagram showing a vehicle seat according to a first embodiment. FIG. [Diagram 2] FIG. 2 is a diagram showing a cushion frame according to the first embodiment. [Diagram 3] FIG. 2 is a diagram showing a cushion frame according to the first embodiment. [Figure 4] FIG. 2 is an exploded view of the attitude-changing mechanism according to the first embodiment. [Diagram 5] 3A to 3C are diagrams illustrating an attitude changing mechanism according to the first embodiment. [Figure 6] 3A to 3C are diagrams illustrating an attitude changing mechanism according to the first embodiment. [Figure 7] 3A to 3C are diagrams illustrating an attitude changing mechanism according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The following "embodiment of the invention" shows an example of an embodiment that falls within the technical scope of the present disclosure. In other words, the invention-specific matters described in the claims are not limited to the specific configurations and structures shown in the following embodiment.

[0021] In this embodiment, the easy chair according to the present disclosure is applied to a seat (hereinafter, referred to as a vehicle seat) mounted on a vehicle such as a car. Arrows and diagonal lines indicating directions are provided in each figure to facilitate understanding of the relationships between the figures and the shapes of the components or parts.

[0022] Therefore, the vehicle seat is not limited to the directions shown in the drawings. The directions shown in the drawings are directions in a state in which the vehicle seat according to the present embodiment is assembled to a vehicle. The drawings with diagonal lines do not necessarily show cross-sectional views.

[0023] At least one of each of the members or parts described with a reference number is provided, unless otherwise specified by "one". In other words, unless otherwise specified by "one", two or more of the member may be provided. The vehicle seat shown in the present disclosure includes at least one of the components such as the members or parts described with a reference number and the structural parts shown in the drawings.

[0024] (First embodiment) <1. Overview of vehicle seats> 1, the vehicle seat 1 includes at least a seat back 3, a seat cushion 5, and a position change mechanism 11. The seat back 3 is a portion for supporting the back of the seated occupant. The seat cushion 5 is a portion for supporting the buttocks of the seated occupant.

[0025] The seat cushion 5 includes a cushion pad (not shown) and a cushion frame 7. The cushion pad is a cushion material made of an elastic material such as urethane foam.

[0026] The cushion frame 7 is a framework material that constitutes the framework of the seat cushion 5. The cushion frame 7 includes a first side frame 71, a second side frame 72, a first connecting member 73, a second connecting member 74, and the like.

[0027] The first side frame 71 is a member disposed at one widthwise end of the seat, i.e., one left-right end, and extends in the front-rear direction of the seat. The second side frame 72 is a member disposed at the other widthwise end, and extends in the front-rear direction.

[0028] The first connecting member 73 and the second connecting member 74 extend in the width direction and connect the first side frame 71 and the second side frame 72. The first connecting member 73 connects the front ends of the side frames 71, 72. The second connecting member 74 connects the rear ends of the side frames 71, 72.

[0029] The first connecting member 73 is connected to each of the side frames 71, 72 so as to be rotatable about the central axis of the first connecting member 73. Similarly, the second connecting member 74 is connected to each of the side frames 71, 72 so as to be rotatable about the central axis of the second connecting member 74.

[0030] The first side frame 71, the second side frame 72, the first connecting member 73, and the second connecting member 74 are made of metal such as a cold-rolled steel plate. The cushion frame 7 is connected and fixed to the vehicle via two slide devices 9.

[0031] Each slide device 9 supports the cushion frame 7, i.e., the vehicle seat 1, so as to be slidable relative to the vehicle. Each slide device 9 includes a fixed rail 91 and a movable rail 92.

[0032] Each fixed rail 91 is a track that is fixed immovably to the vehicle. Each movable rail 92 is a member that is slidable relative to the corresponding fixed rail 91. The movable rail 92 is provided with fixed brackets 93A to 93D.

[0033] 1 and 2, the cushion frame 7 according to this embodiment is connected to each of the fixed brackets 93A to 93D via lifter links 10A to 10D. The lifter links 10A to 10D are part of a mechanism for displacing the cushion frame 7 up and down.

[0034] The electric motor 10E (see FIG. 2) is an actuator for operating the lifter links 10A to 10D. When the electric motor 10E is operated, the lifter links 10A to 10D swing about the fixed brackets 93A to 93D, respectively.

[0035] That is, the fixed brackets 93A to 93D are positions that become references when the cushion frame 7 is displaced. In other words, the cushion frame 7 is displaced with the fixed brackets 93A to 93D as immovable positions.

[0036] <2. Attitude change mechanism> <2.1 Configuration of attitude change mechanism> The posture changing mechanism 11 is a mechanism for displacing the cushion frame 7 between the comfortable posture and the normal posture. The comfortable posture refers to a posture in which the front end side of the cushion frame 7 is raised compared to the rear end side (see FIG. 3).

[0037] The normal posture is a posture in which the front end side of the cushion frame 7 is lowered compared to the comfortable posture (see FIG. 1). Note that the posture changing mechanism 11 according to this embodiment is disposed on the first side frame 71 side.

[0038] 4, the posture change mechanism 11 is configured to include at least a first link 12, a second link 13, a male threaded rod 14, a nut (not shown), and an electric motor 15. The nut is rotatably housed in a casing 15A and is a rotating body provided with a female threaded hole that meshes with the male threaded rod 14.

[0039] The electric motor 15 generates a torque that rotates the nut. Therefore, when the electric motor 15 operates to rotate the nut, the male threaded rod 14 is displaced in a direction parallel to the longitudinal direction of the male threaded rod 14 relative to the casing 15A due to the screw principle.

[0040] 5 to 7, one longitudinal end of the first link 12 is rotatably connected to a fixed bracket 93A. The other longitudinal end of the first link 12 and one longitudinal end of the second link 13 are rotatably connected to each other.

[0041] The first link 12 according to this embodiment also functions as the lifter link 10A. That is, in this embodiment, the first link 12 and the lifter link 10A are configured from the same member.

[0042] The other longitudinal end of the second link 13 is rotatably connected to one longitudinal end of the male threaded rod 14. Hereinafter, the connection point between the first link 12 and the second link 13 is referred to as a first connection point C1. The connection point between the second link 13 and the male threaded rod 14 is referred to as a second connection point C2.

[0043] The electric motor 15 is rotatably supported by the first link 12 or the fixed bracket 93A (in this embodiment, the first link 12). Specifically, the electric motor 15 is rotatably supported by the first link 12 via a mounting bracket 15B.

[0044] The support point C4 of the electric motor 15 is located on the fixed bracket 93A side of the midpoint of the line segment connecting the first connecting point C1 and the connecting point C5 (see FIG. 7) between the first link 12 and the fixed bracket 93A. The midpoint is a point that divides the length of the line segment into 1 / 2.

[0045] The figure connecting the first connecting point C1, the second connecting point C2, and the support point C4 always forms a triangle as shown in Figures 5 and 6. The cushion frame 7 (in this embodiment, the first side frame 71) is connected to the second link 13.

[0046] 7, the second link 13 is connected to the cushion frame 7 via a first connecting member 73. Hereinafter, the connection point between the second link 13 and the cushion frame 7 is referred to as a third connecting point C3. The third connecting point C3 is located on the central axis of the first connecting member 73.

[0047] In the normal posture, the first connection point C1 is located above the third connection point C3 as shown in Fig. 6. In the comfortable posture, the first connection point C1 is located below the third connection point C3 as shown in Fig. 5.

[0048] <2.2 Configuration of the second side frame> 2, a third link 16, a fourth link 17, and a fixed bracket 93B are provided on the second side frame 72. In other words, the configuration on the second side frame 7 side is such that the actuators such as the male threaded rod 14 and the electric motor 15 are eliminated from the position-changing mechanism 11.

[0049] That is, the third link 16 corresponds to the first link 12, the fourth link 17 corresponds to the second link 13, and the fixed bracket 93B corresponds to the fixed bracket 93A. One longitudinal end side of the third link 16 is rotatably connected to the fixed bracket 93B.

[0050] The other end side in the longitudinal direction of the third link 16 is rotatably connected to one end side in the longitudinal direction of the fourth link 17. Note that the third link 16 according to this embodiment also functions as a lifter link 10C.

[0051] The second link 13 and the fourth link 17 are configured to be movable as a unit with the first connecting member 73. Specifically, the second link 13 and the fourth link 17 are fixed to the first connecting member 73 by welding. Therefore, the second link 13 and the fourth link 17 rotate integrally with the first connecting member 73.

[0052] <2.3 Operation of attitude change mechanism> The vehicle seat 1 is provided with a control unit (not shown) that controls the operation of the electric motors 15 and 10E, a posture selection switch (not shown) for selecting the posture of the vehicle seat 1, and the like.

[0053] When a user operates the posture selection switch to select the comfortable posture, the control unit first operates the electric motor 10E to place the lifter links 10A to 10D in a predetermined posture, and then operates the electric motor 15 to place the first side frame 71 and the second side frame 72 in the comfortable posture (see FIG. 5).

[0054] In the vehicle seat 1 according to this embodiment, when the vehicle seat 1 is in the comfortable position, the electric motor 10E, i.e., the lifter links 10A to 10D, are in an inoperable state. This is because if the lifter links 10A to 10D are operated in the comfortable position, interference may occur in any of the locations.

[0055] <3. Features of the vehicle seat according to this embodiment> In the attitude change mechanism 11 according to this embodiment, a truss structure is formed by the first link 12, the second link 13, and the male threaded rod 14 (see Figs. 5 and 6). Therefore, in principle, no large bending moment is generated in the first link 12, the second link 13, and the male threaded rod 14.

[0056] Therefore, with this posture change mechanism 11, when a large load acts on the cushion frame 7, deformation and damage to the first link 12, the second link 13 and the male threaded rod 14 due to bending moment can be suppressed.

[0057] In this embodiment, since second link 13 and cushion frame 7 are connected at the middle part in the longitudinal direction of second link 13, a bending moment is generated in second link 13 due to simple support at both ends.

[0058] However, the second moment of area at the intermediate portion, i.e., the third connecting point C3, is sufficiently large compared to other portions, so that the bending moment is prevented from significantly deforming second link 13. Note that the second moment of area refers to rigidity against moments around the width direction.

[0059] In the position-changing mechanism 11, a connection point C3 between the second link 13 and the cushion frame 7 is located between the first connection point C1 and the second connection point C2 of the second link 13 (see FIGS. 5 and 6).

[0060] This prevents the force for displacing the male threaded rod 14 and the axial force acting on the male threaded rod 14 from becoming excessively large, and increases the amount of upward displacement of the cushion frame 7.

[0061] Furthermore, if the connection point C3 between the second link 13 and the cushion frame 7 coincides with the second connection point C2, the distance from the first connection point C1 to the second connection point C2 will be small, and the force for displacing the male threaded rod 14 and the axial force acting on the male threaded rod 14 will become excessively large.

[0062] The electric motor 15 is supported by the first link 12, and its support point C4 is located on the fixed bracket 93A side of the midpoint of the line segment connecting the first connection point C1 and the connection point C5 between the first link 12 and the fixed bracket 93A.

[0063] This prevents the center of gravity of the electric motor 15 from being significantly displaced in the vertical direction even if the male threaded rod 14 is significantly displaced in the axial direction. Therefore, the electric motor 15, which is an item with a relatively large mass, can be prevented from being significantly displaced.

[0064] In the normal posture, the first connection point C1 is located above the third connection point C3, and in the comfortable posture, the first connection point C1 is located below the third connection point C3. This increases the rocking angle of the second link 13 about the first connection point C1, making it possible to tilt the cushion frame 7 significantly in the comfortable posture.

[0065] The second link 13 and the fourth link 17 are configured to move as a unit with the first connecting member 73. As a result, even if a large load acts on the second side frame 72, the energy of the load is also transmitted to the first side frame 71 via the first connecting member 73. As a result, the load is dispersed, and sufficient rigidity can be ensured.

[0066] (Other embodiments) The fixed brackets 93A to 93D according to the above-described embodiments are provided on the movable rail 92. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the fixed brackets 93A to 93D are directly or indirectly fixed to the vehicle in a configuration in which the slide device 9 is eliminated, for example.

[0067] In the above embodiment, the truss structure is such that the male threaded rod 14 is located below the first connecting point C1. However, the present disclosure is not limited to this. That is, the present disclosure may be, for example, a truss structure in which the position of the first link 12 and the position of the male threaded rod 14 are interchanged.

[0068] In the above-described embodiment, the connection point C3 between the second link 13 and the cushion frame 7 is located between the first connection point C1 and the second connection point C2 of the second link 13. However, the present disclosure is not limited to this.

[0069] That is, the disclosure may be configured such that, for example, the connection point C3 between the second link 13 and the cushion frame 7 coincides with the second connection point C2. In addition, with this configuration, no bending moment is generated in the second link 13 and the male threaded rod 14.

[0070] In the above embodiment, the second link 13 and the fourth link 17 are configured to move as a single unit with the first connecting member 73. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, at least one of the second link 13 and the fourth link 17 is rotatably connected to the first connecting member 73.

[0071] The second link 13 according to the embodiment described above is connected to the cushion frame 7 via the first connecting member 73. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that the second link 13 is directly connected to the cushion frame 7, for example.

[0072] In the above embodiment, the first connection point C1 is located above the third connection point C3 in the normal posture, and the first connection point C1 is located below the third connection point C3 in the comfortable posture. However, the present disclosure is not limited to this.

[0073] In the above-described embodiment, the lifter mechanism is provided. However, the present disclosure is not limited to this. That is, the present disclosure may be configured, for example, such that the lifter mechanism is eliminated. Also, at least one of the lifter mechanism and the attitude change mechanism 11 may be provided on the second side frame 72 side.

[0074] The electric motor 15 according to the above-described embodiment is rotatably supported by the first link 12 or the fixed bracket 93A. However, the present disclosure is not limited to this. That is, the present disclosure may be configured such that, for example, the electric motor 15 is rotatably supported by the second link 13, and the tip side of the male threaded rod 14 is rotatably connected to the first link 12 or the fixed bracket 93A.

[0075] In the above embodiment, the vehicle seat according to the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited thereto. That is, the disclosure can be applied to, for example, seats used in vehicles such as railroad cars, ships, and aircraft, as well as stationary seats used in theaters, homes, and the like.

[0076] Furthermore, the present disclosure is not limited to the above-mentioned embodiments as long as it is consistent with the gist of the disclosure described in the above-mentioned embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-mentioned embodiments are combined, or a configuration in which any of the components illustrated or the components described with reference numerals in the above-mentioned embodiments are eliminated. [Explanation of symbols]

[0077] 1. Vehicle seat 5… Seat cushion 7… Cushion frame 9... Slide device 11... Posture change mechanism 12... Link 1 13... 2nd link 14… Male threaded rod 15... Electric motor 71… First side frame 73… First connecting member 74… Second connecting member 91…Fixed rail 92... Movable rail 93A… Fixing bracket

Claims

1. Cushion frame and a posture change mechanism for displacing the cushion frame between a comfortable posture in which the front end side of the cushion frame is raised relative to the rear end side and a normal posture in which the front end side is lowered relative to the comfortable posture, the posture change mechanism including a first link, a second link, a male threaded rod, and an electric motor for rotating a nut engaging with the male threaded rod; One end side of the first link in the longitudinal direction is rotatably connected to a fixed bracket, The other end side of the first link in the longitudinal direction and the one end side of the second link in the longitudinal direction are rotatably connected to each other, The other end of the second link in the longitudinal direction is rotatably connected to one end of the male threaded rod in the longitudinal direction, the electric motor is rotatably supported by the first link or the fixed bracket, When a connection point between the first link and the second link is defined as a first connection point, and a connection point between the second link and the male threaded rod is defined as a second connection point, An easy chair in which a figure connecting the support point of the electric motor, the first connecting point and the second connecting point always forms a triangle, and the cushion frame is connected to the second link.

2. 2. The easy chair according to claim 1, wherein the connection point between the second link and the cushion frame is located between the first connection point and the second connection point of the second link.

3. The cushion frame is a first side frame disposed at one end in the width direction and extending in the front-rear direction; A second side frame disposed on the other end side in the width direction and extending in the front-rear direction; and a connecting member extending in a width direction to connect the first side frame and the second side frame, the position change mechanism is disposed on the first side frame side, A third link, a fourth link, and a second fixing bracket are provided on the second side frame side, One end side of the third link in the longitudinal direction is rotatably connected to the second fixed bracket, the other end side of the third link in the longitudinal direction and one end side of the fourth link in the longitudinal direction are rotatably connected to each other, 3. The easy chair according to claim 2, wherein the second link and the fourth link are configured to be movable as a unit with the connecting member.

4. The electric motor is supported by the first link, 3. The armchair according to claim 1, wherein the support point is located on the fixed bracket side of the midpoint of a line segment connecting the connection point between the first link and the fixed bracket and the first connection point.

5. When a connection point between the second link and the cushion frame is defined as a third connection point, In the normal posture, the first connection point is located above the third connection point, 4. The easy chair according to claim 1, wherein, in the comfortable position, the first connecting point is located lower than the third connecting point.

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