Easy chair and vehicle seat

Abstract

The invention relates to an comfort chair and a vehicle seat. Disclosed is an example of an comfort chair in which deformation and damage of a link when a large load acts on a cushion frame can be suppressed. The posture changing mechanism of the amusing chair is provided with a first connecting rod, a second connecting rod and a male threaded rod, and a truss structure is formed by the components. Therefore, in principle, the first connecting rod, the second connecting rod and the external thread rod do not generate large bending moment. According to the posture changing mechanism, the first connecting rod, the second connecting rod and the male threaded rod can be prevented from being deformed and damaged due to bending moment when a large load acts on the seat cushion frame.

Description

Technical Field

[0001] The present disclosure relates to an easy chair and a vehicle seat in which the posture of a seat frame can be displaced. Background Art

[0002] For example, in a vehicle seat described in Chinese Utility Model Patent No. 218892464 (hereinafter referred to as Patent Document 1), the lower end of a first link is rotatably connected to a fixed bracket fixed to a movable guide rail of a sliding device, the first end of a second link is rotatably connected to an upper end of the first link, the second end of the second link is rotatably connected to a seat cushion frame, and the posture of the seat cushion frame is changed by changing the angle formed between the first link and the second link by an actuator. Summary of the invention

[0003] In the vehicle seat described in Patent Document 1, the posture of the seat cushion frame is changed by changing the angle formed between the first link and the second link by an actuator. Therefore, when a large load acts on the seat cushion frame, a large bending moment is easily generated on the first link and the second link.

[0004] Therefore, in the vehicle seat described in Patent Document 1, when a large load acts on the seat cushion frame, there is a risk that the first link and the second link may be deformed and damaged. In view of this problem, the present disclosure discloses an example of an easy chair.

[0005] Preferably, the reclining chair comprises: for example, a seat cushion frame; and a posture changing mechanism, which displaces the seat cushion frame between a reclining posture and a normal posture, wherein the reclining posture is a posture in which the front end side of the seat cushion frame is higher than the rear end side, and the normal posture is a posture in which the front end side is lowered compared to the reclining posture, and the posture changing mechanism has a first connecting rod, a second connecting rod, an externally threaded rod, and an electric motor that rotates a nut meshing with the externally threaded rod.

[0006] Moreover, the first end side of the first connecting rod in the longitudinal direction is connected to the fixed bracket in a rotatable manner, the second end side of the first connecting rod in the longitudinal direction and the first end side of the second connecting rod in the longitudinal direction are connected to each other in a rotatable manner, the second end side of the second connecting rod in the longitudinal direction and the first end side of the externally threaded rod in the longitudinal direction are connected to each other in a rotatable manner, and the electric motor is supported by the first connecting rod or the fixed bracket so as to be rotatable.

[0007] In addition, it is preferred that the figure connecting the support point of the electric motor, the first connection point, and the second connection point always forms a triangle, and it is preferred that the seat frame is connected to the second connecting rod. Among them, the first connection point is the connection point between the first connecting rod and the second connecting rod. The second connection point is the connection point between the second connecting rod and the external threaded rod.

[0008] Thus, in the posture changing mechanism of the recliner, the first link, the second link, and the externally threaded rod form a truss structure. Therefore, in principle, the first link, the second link, and the externally threaded rod do not generate a large bending moment.

[0009] Therefore, the posture changing mechanism can suppress deformation and damage of the first link, the second link, and the externally threaded rod due to bending moment when a large load acts on the seat cushion frame.

[0010] The easy chair may be configured as follows, for example.

[0011] Preferably, the connection point between the second link and the seat cushion frame is located between the first connection point and the second connection point of the second link.

[0012] Thus, the upward displacement amount of the seat cushion frame can be increased while suppressing the force for displacing the externally threaded rod and the axial force acting on the externally threaded rod from becoming excessive.

[0013] The seat cushion frame preferably comprises: a first side frame, which is arranged at the first end side in the width direction and extends along the front-to-back direction; a second side frame, which is arranged at the second end side in the width direction and extends along the front-to-back direction; and a connecting component, which extends along the width direction and connects the first side frame and the second side frame to each other, the posture changing mechanism is arranged on the first side frame side, and a third link, a fourth link, and a second fixed bracket are provided on the second side frame side, the first end side of the third link in the longitudinal direction is rotatably connected to the second fixed bracket, the second end side of the third link in the longitudinal direction and the first end side of the fourth link in the longitudinal direction are rotatably connected to each other, and the second link and the fourth link are preferably constructed to be movable as an integral component integrated with the connecting component.

[0014] Thus, even if a large load acts on the second side frame, the energy of the load is transmitted to the first side frame via the connecting member. Therefore, the load is dispersed, and sufficient rigidity can be ensured.

[0015] The electric motor is preferably supported by the first link, and the support point is preferably located closer to the fixed bracket than the midpoint of a line segment connecting a connection point between the first link and the fixed bracket and the first connection point.

[0016] Thus, even if the externally threaded rod is displaced greatly in the axial direction, the center of gravity of the electric motor can be suppressed from being displaced greatly in the vertical direction. Therefore, the electric motor, which is a relatively large mass object, can be suppressed from being displaced greatly.

[0017] In addition, when the connection point between the second link and the seat cushion frame is used as the third connection point, it is preferred that the first connection point is located above the third connection point when in the normal posture, and it is preferred that the first connection point is located below the third connection point when in the comfortable posture. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram showing a vehicle seat according to an embodiment.

[0019] Figure 2 It is a figure which shows the seat cushion frame which concerns on embodiment.

[0020] Figure 3 It is a figure which shows the seat cushion frame which concerns on embodiment.

[0021] Figure 4 It is an exploded view showing the posture changing mechanism according to the embodiment.

[0022] Figure 5 It is a diagram showing a posture changing mechanism according to an embodiment.

[0023] Figure 6 It is a diagram showing a posture changing mechanism according to an embodiment.

[0024] Figure 7 It is a diagram showing a posture changing mechanism according to an embodiment. DETAILED DESCRIPTION

[0025] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0026] The "embodiment" described below is an example of an embodiment to which the present disclosure belongs. That is, the technical solutions and the like described in the claims are not limited to the specific structures or configurations and the like shown in the following embodiment.

[0027] This embodiment is an example of a seat for use in a vehicle such as a vehicle. The seat for use in a vehicle corresponds to an example of an easy chair. Arrows and oblique lines indicating directions in the drawings are elements of the drawings for easy understanding of the relationship between the drawings and the shapes of components or parts.

[0028] Therefore, the vehicle seat is not limited to the directions shown in the drawings. The directions shown in the drawings are directions when the vehicle seat of the present embodiment is assembled to a vehicle. The drawings marked with oblique lines do not necessarily represent cross-sectional views.

[0029] For a component or part that is at least marked with a symbol for explanation, at least one of them is provided, unless it is previously stated as "one". That is, unless it is previously stated as "one", more than two of the component may be provided. The vehicle seat shown in the present disclosure includes at least (i) components or parts such as components that are at least marked with a symbol for explanation, and (2) one of the structural parts shown in the figure.

[0030] <1. Overview of vehicle seats>

[0031] like Figure 1 As shown, the vehicle seat 1 includes a seat back 3, a seat cushion 5, and a posture changing mechanism 11. The seat back 3 supports the back of the seated person, and the seat cushion 5 supports the buttocks of the seated person.

[0032] 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 polyurethane foam.

[0033] The seat cushion frame 7 is a frame member constituting the frame of the seat cushion 5. The seat cushion frame 7 includes a first side frame 71, a second side frame 72, a first connecting member 73, and a second connecting member 74.

[0034] The first side frame 71 is a member disposed at the first end side in the width direction of the seat, that is, at the first end side in the left-right direction, and extending in the front-rear direction of the seat. The second side frame 72 is a member disposed at the second end side in the width direction of the seat and extending in the front-rear direction of the seat.

[0035] 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 end side of the first side frame 71 and the front end side of the second side frame 72. The second connecting member 74 connects the rear end side of the first side frame 71 and the rear end side of the second side frame 72.

[0036] The first connecting member 73 is connected to each side frame 71, 72 in a manner that is rotatable relative to each side frame 71, 72 around the central axis of the first connecting member 73. Similarly, the second connecting member 74 is connected to each side frame 71, 72 in a manner that is rotatable relative to each side frame 71, 72 around the central axis of the second connecting member 74.

[0037] 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 cold-rolled steel plates. The seat cushion frame 7 is connected and fixed to the vehicle via two slide devices 9 .

[0038] Each slide device 9 supports the seat cushion frame 7 , that is, 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 .

[0039] Each fixed rail 91 is fixed to the vehicle in a state where it cannot move relative to the vehicle. Each movable rail 92 is a component that can slide relative to the corresponding fixed rail 91. Fixed brackets 93A and 93C are provided on one movable rail 92, and fixed brackets 93B and 93D are provided on the other movable rail 92.

[0040] like Figure 1 and Figure 2 As shown, the seat cushion frame 7 is connected to the fixing brackets 93A and 93C via lifter links 10A and 10B, and is connected to the fixing brackets 93B and 93D via lifter links 10C and 10D. The lifter links 10A to 10D are part of a mechanism (lifting mechanism) for vertically displacing the seat cushion frame 7.

[0041] Electric motor 10E (refer to Figure 2 ) is an actuator for moving the lifter links 10A to 10D. When the electric motor 10E operates, the lifter links 10A to 10D swing around the axis passing through each fixing bracket 93A to 93D.

[0042] That is, the positions of the fixing brackets 93A to 93D are reference positions when the seat cushion frame 7 is displaced. In other words, the seat cushion frame 7 is displaced with the positions of the fixing brackets 93A to 93D being fixed positions.

[0043] <2. Posture change mechanism>

[0044] <2.1 Configuration of posture change mechanism>

[0045] The posture changing mechanism 11 is a mechanism for displacing the seat cushion frame 7 between the comfortable posture and the normal posture. The comfortable posture is a posture in which the front end side of the seat cushion frame 7 is higher than the rear end side (refer to Figure 3 ).

[0046] The normal posture is a posture in which the front end side of the seat cushion frame 7 is lowered compared to the comfortable posture (refer to Figure 1 ). The posture changing mechanism 11 is arranged on the first side frame 71 side.

[0047] like Figure 4 As shown, the posture changing mechanism 11 includes a first link 12, a second link 13, an externally threaded rod 14, a nut (not shown), and an electric motor 15. The nut is rotatably accommodated in a housing 15A and is a rotating body having an internally threaded hole engaged with the externally threaded rod 14.

[0048] The electric motor 15 generates a rotational force that rotates the nut. Therefore, when the electric motor 15 operates to rotate the nut, the externally threaded rod 14 is displaced relative to the housing 15A in a direction parallel to the longitudinal direction of the externally threaded rod 14 by the principle of the screw.

[0049] like Figure 5 to Figure 7 As shown, the first end side of the first link 12 in the longitudinal direction is rotatably connected to the fixed bracket 93A. In addition, the second end side of the first link 12 in the longitudinal direction and the first end side of the second link 13 in the longitudinal direction are rotatably connected to each other.

[0050] The first link 12 also functions as the lifter link 10A. In other words, in the present embodiment, the first link 12 and the lifter link 10A are formed of the same member.

[0051] The second end side of the second connecting rod 13 in the longitudinal direction and the first end side of the external threaded rod 14 in the longitudinal direction are rotatably connected to each other. Hereinafter, the connection point between the first connecting rod 12 and the second connecting rod 13 is referred to as the first connection point C1. The connection point between the second connecting rod 13 and the external threaded rod 14 is referred to as the second connection point C2.

[0052] The electric motor 15 is rotatably supported by the first link 12 or the fixed bracket 93A (the first link 12 in the present embodiment). Specifically, the electric motor 15 is rotatably supported by the first link 12 via a mounting bracket 15B.

[0053] The support point C4 of the electric motor 15 is located closer to the fixed bracket 93A side than the midpoint of the line segment connecting the first link 12 and the fixed bracket 93A (see Figure 7 ) and the first connection point C1. In addition, the midpoint is a point that divides the length of the line segment into halves.

[0054] Moreover, if Figure 5 and Figure 6 As shown in FIG. 1 , a figure connecting the first connection point C1 , the second connection point C2 , and the support point C4 always forms a triangle. Furthermore, the seat cushion frame 7 (the first side frame 71 in the present embodiment) is connected to the second link 13 .

[0055] Specifically, if Figure 7 As shown, the second link 13 is connected to the cushion frame 7 via the first connection member 73. Hereinafter, the connection point between the second link 13 and the cushion frame 7 is referred to as a third connection point C3. The third connection point C3 is located on the central axis of the first connection member 73.

[0056] Moreover, if Figure 6 As shown in FIG. 1 , when the joint is in the normal posture, the first connection point C1 is located above the third connection point C3. Figure 5 As shown in FIG. 1 , when the patient is in the comfortable posture, the first connection point C1 is located below the third connection point C3 .

[0057] <2.2 Configuration of the Second Side Frame>

[0058] like Figure 2 As shown, the third link 16, the fourth link 17, and the fixing bracket 93B are provided on the second side frame 72. That is, the second side frame 72 is configured such that the actuators such as the external thread rod 14 and the electric motor 15 are eliminated from the posture changing mechanism 11.

[0059] 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. The first end side of the third link 16 in the longitudinal direction is rotatably connected to the fixed bracket 93B.

[0060] The second end side in the longitudinal direction of the third link 16 is rotatably connected to the first end side in the longitudinal direction of the fourth link 17. The third link 16 also functions as a lifter link 10C.

[0061] Furthermore, the second link 13 and the fourth link 17 are configured to be movable as an integral member integrated with the first connecting member 73. Specifically, the second link 13 and the fourth link 17 are respectively fixed to the first connecting member 73 by welding. Thus, the second link 13 and the fourth link 17 rotate integrally with the first connecting member 73.

[0062] <2.3 Action of the posture change mechanism>

[0063] The vehicle seat 1 is provided with a control unit (not shown) for controlling the operation of the electric motors 15 and 10E and a posture selection switch (not shown) for selecting the posture of the vehicle seat 1 .

[0064] When the user operates the posture selection switch and selects the comfortable posture, the control unit first operates the electric motor 10E so that the lifter links 10A to 10D are in a preset posture. Next, the control unit operates the electric motor 15 so that the first side frame 71 and the second side frame 72 are in the comfortable posture (see Figure 5 ).

[0065] In the vehicle seat 1, when the vehicle seat 1 is in the comfortable position, the electric motor 10E, namely the lifter links 10A to 10D, cannot operate. This is because if the lifter links 10A to 10D are operated while the comfortable position is maintained, there is a risk of interference with certain parts.

[0066] <3. Characteristics of vehicle seats>

[0067] (1a) In the posture changing mechanism 11 of the vehicle seat 1, the first link 12, the second link 13, and the external threaded rod 14 form a truss structure (see Figure 5 and Figure 6 ). Therefore, in principle, the first connecting rod 12, the second connecting rod 13, and the externally threaded rod 14 will not generate a large bending moment.

[0068] Therefore, the posture changing mechanism 11 can suppress the first link 12 , the second link 13 , and the externally threaded rod 14 from being deformed and damaged due to bending moment when a large load acts on the seat cushion frame 7 .

[0069] In the present embodiment, the second link 13 and the cushion frame 7 are connected to each other at the middle portion of the second link 13 in the longitudinal direction, so a bending moment is generated in the second link 13 due to simple support at both ends.

[0070] However, the secondary moment of cross section at the middle portion, that is, the third connection point C3, is sufficiently large compared to other portions, so that the second link 13 can be prevented from being greatly deformed by the bending moment. The secondary moment of cross section refers to the rigidity against the bending moment in the width direction.

[0071] (1b) In the posture changing mechanism 11, the third 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 Figure 5 and Figure 6 ).

[0072] Thus, the upward displacement amount of the seat cushion frame 7 can be increased while suppressing the force for displacing the externally threaded rod 14 and the axial force acting on the externally threaded rod 14 from becoming excessive.

[0073] Assuming that the third connection point C3 of the second link 13 and the cushion frame 7 coincides with the second connection point C2, since the distance from the first connection point C1 to the second connection point C2 becomes smaller, the force for displacing the externally threaded rod 14 and the axial force acting on the externally threaded rod 14 become too large.

[0074] (1c) The electric motor 15 is supported by the first link 12, and its support point C4 is located closer to the fixed bracket 93A than the midpoint of the line segment connecting the connection point C5 of the first link 12 and the fixed bracket 93A and the first connection point C1.

[0075] Thus, even if the externally threaded rod 14 is greatly displaced in the axial direction, it is possible to suppress a large vertical displacement of the center of gravity of the electric motor 15. Therefore, it is possible to suppress a large displacement of the electric motor 15, which is a relatively large mass object.

[0076] (1d) 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. As a result, the swing angle of the second connection point 13 around the first connection point C1 increases, so that the seat cushion frame 7 can be tilted greatly in the comfortable posture.

[0077] (1e) The second link 13 and the fourth link 17 are configured to be movable as an integral component integrated with the first connecting member 73. Thus, even if a large load acts on the second side frame 72 side, the energy of the load is transmitted to the first side frame 71 side via the first connecting member 73. Therefore, the load is dispersed, and sufficient rigidity can be ensured.

[0078] (Other Implementations)

[0079] The fixing brackets 93A to 93D of the above embodiment are provided on the movable rail 92. However, the present disclosure is not limited thereto. For example, in a configuration in which the slide device 9 is eliminated, the fixing brackets 93A to 93D may be directly or indirectly fixed to the vehicle.

[0080] In the above embodiment, the truss structure is configured such that the external thread rod 14 is located below the first connection point C1. However, the present disclosure is not limited thereto. For example, a truss structure may be used in which the position of the first connection point 12 and the position of the external thread rod 14 are interchanged.

[0081] In the above-described embodiment, the third 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 thereto.

[0082] For example, the third connection point C3 and the second connection point C2 of the second link 13 and the cushion frame 7 may be configured to coincide with each other. In this configuration, no bending moment is generated between the second link 13 and the externally threaded rod 14 .

[0083] In the above-mentioned embodiment, the second link 13 and the fourth link 17 are configured to be movable as an integral component integrated with the first connecting member 73. However, the present disclosure is not limited thereto. For example, at least one of the second link 13 and the fourth link 17 may be configured to be connected to the first connecting member 73 in a manner that allows rotation relative to the first connecting member 73.

[0084] In the above-described embodiment, the second link 13 is connected to the seat cushion frame 7 via the first connection member 73. However, the present disclosure is not limited thereto. For example, the second link 13 may be directly connected to the seat cushion frame 7.

[0085] In the above embodiment, the first connection point C1 is located above the third connection point C3 in the normal posture, and is located below the third connection point C3 in the comfortable posture. However, the present disclosure is not limited thereto.

[0086] In the above-mentioned embodiment, a lifting mechanism is provided. However, the present disclosure is not limited thereto. For example, the lifting mechanism may be eliminated. In addition, at least one of the lifting mechanism and the posture changing mechanism 11 may be provided on the second side frame 72 side.

[0087] The electric motor 15 in the above-mentioned embodiment is supported by the first connecting rod 12 or the fixed bracket 93A so as to be rotatable. However, the present disclosure is not limited thereto. For example, the electric motor 15 may be supported by the second connecting rod 13 so as to be rotatable, and the front end side of the external threaded rod 14 may be connected to the first connecting rod 12 or the fixed bracket 93A in a rotatable manner.

[0088] In the above-mentioned embodiment, the vehicle seat of the present disclosure is applied to a vehicle. However, the application of the invention disclosed in this specification is not limited thereto. For example, the present disclosure can also be applied to seats used in vehicles such as railway vehicles, ships, and aircraft, and fixed seats used in theaters or homes.

[0089] In addition, the present disclosure is not limited to the above-mentioned embodiments as long as it complies with the disclosure of the above-mentioned embodiments. It may be a configuration that combines at least two of the above-mentioned multiple embodiments, or it may be a configuration that abolishes any of the illustrated constituent elements or constituent elements that are described by marking symbols in the above-mentioned embodiments.

Claims

1. An easy chair, characterized in that: have: Cushion frame; as well as A posture changing mechanism, the posture changing mechanism displaces the seat cushion frame between a comfortable posture and a normal posture, wherein the comfortable posture is a posture in which the front end side of the seat cushion frame is higher than the rear end side, and the normal posture is a posture in which the front end side is lowered compared to the comfortable posture, the posture changing mechanism having a first connecting rod, a second connecting rod, an externally threaded rod, and an electric motor that rotates a nut meshing with the externally threaded rod, and The first end side of the first connecting rod in the longitudinal direction is connected to the fixed bracket in a rotatable manner. The second end side of the first link in the longitudinal direction and the first end side of the second link in the longitudinal direction are rotatably connected to each other. The second end side of the second link in the longitudinal direction and the first end side of the externally threaded rod in the longitudinal direction are rotatably connected to each other. The electric motor is rotatably supported by the first link or the fixed bracket. When the connection point between the first link and the second link is defined as the first connection point, and the connection point between the second link and the externally threaded rod is defined as the second connection point, A figure connecting the support point of the electric motor, the first connection point, and the second connection point always forms a triangle, and the seat cushion frame is connected to the second link.

2. The easy chair according to claim 1, characterized in that A connection point between the second link and the seat cushion frame is located between the first connection point and the second connection point of the second link.

3. The easy chair according to claim 2, characterized in that: The cushion frame has: a first side frame disposed at a first end side in the width direction and extending in the front-rear direction; a second side frame disposed at a second end side in the width direction and extending in the front-rear direction; as well as a connecting member extending in the width direction and connecting the first side frame and the second side frame to each other, The posture changing mechanism is arranged on the first side frame side. A third link, a fourth link, and a second fixing bracket are provided on the second side frame. The first end side of the third link in the longitudinal direction is rotatably connected to the second fixing bracket. The second end side of the third link in the longitudinal direction and the first end side of the fourth link in the longitudinal direction are rotatably connected to each other. The second link and the fourth link are configured to be movable as an integral member integrated with the connection member.

4. The easy chair according to claim 1 or 2, characterized in that: The electric motor is supported by the first connecting rod. Furthermore, the support point is located closer to the fixed bracket than a midpoint of a line segment connecting a connection point between the first link and the fixed bracket and the first connection point.

5. The easy chair according to any one of claims 1 to 3, characterized in that: When the connection point between the second link and the seat cushion frame is used as the third connection point, When in the normal posture, the first connection point is located above the third connection point. Furthermore, when the patient is in the comfortable posture, the first connection point is located below the third connection point.

6. A seat for a vehicle, characterized in that: have: Cushion frame; as well as a posture changing mechanism that displaces the seat cushion frame, The posture changing mechanism comprises a first link, a second link, an externally threaded rod, and an electric motor for displacing the externally threaded rod, and The first end side of the first link in the longitudinal direction is rotatably connected to a predetermined fixed position. The second end side of the first link in the longitudinal direction and the first end side of the second link in the longitudinal direction are rotatably connected to each other. The second end side of the second link in the longitudinal direction and the first end side of the externally threaded rod in the longitudinal direction are rotatably connected to each other. The electric motor is rotatably supported by the first link. When the connection point between the first link and the second link is defined as the first connection point, and the connection point between the second link and the externally threaded rod is defined as the second connection point, A figure connecting the support point of the electric motor, the first connection point, and the second connection point always forms a triangle.

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