Vehicle seat

Abstract

To provide a seat for a vehicle which can appropriately achieve both a mode in which a seat back and a seat cushion are interlocked to change their setting states and a mode in which an angle of a rising posture of the seat back can be independently changed.SOLUTION: A seat A for a vehicle is equipped with a link member 3 for changing a position and / or a posture of a seat cushion 1 by interlocking with a seat back 2. The seat for a vehicle includes: a guide surface part 6a, 6b which is provided on one of the seat back 2 and the link member 3 and has an arc shape using a prescribed rotation support part 59 as a center; a part 7 to be guided which is provided on the other of them and can be relatively displaced to displace along the guide surface part 6a, 6b in changing a rising angle of the seat back 2; and a locking mechanism C3 which can set to switch between a locked state for preventing the relative displacement of the guide surface part 6a, 6b and the part 7 to be guided and the cancelling state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle seat to be installed in a vehicle such as an automobile. [Background technology]

[0002] Many vehicle seats are reclining seats that allow the upright angle of the seat back (backrest portion) to be changed. Some of these types of vehicle seats are configured such that the seat back and the seat cushion (seat portion) are connected by a link member, and the position and posture of the seat cushion are changed in conjunction with the change in the upright angle of the seat back (see, for example, Patent Document 1). This configuration facilitates the operation of changing the position and posture of the seat cushion in accordance with the upright angle of the seat back.

[0003] However, in the above-mentioned conventional technology, the seat cushion is merely connected to the seat back using a link member as a means for displacing the seat cushion in conjunction with the change in the upright angle of the seat back. Therefore, it is difficult to change only the upright angle of the seat back and set the seat back to a reclining state without changing the position or posture of the seat cushion. This is inconvenient. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-129317 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention was devised under the circumstances described above, and has as its object to provide a vehicle seat that can appropriately achieve both a configuration in which the setting state of the seat back and the seat cushion can be changed by linking them, and a configuration in which the angle of the upright position of the seat back can be changed independently without linking the seat back and the seat cushion. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides the following technical solutions.

[0007] The vehicle seat provided by the present invention is provided with a seat back whose upright angle can be changed by rotating around a rotation support part, and a link member for connecting the seat back to the seat cushion or a support member supporting the seat cushion so that the position and / or posture of the seat cushion can be changed in conjunction with a change in the upright angle of the seat back. The vehicle seat further comprises: an arc-shaped guide surface part provided on either the seat back or the link member and centered on the rotation support part; a guided part provided on the other of the two and capable of being relatively displaced so as to move along the guide surface part when the upright angle of the seat back is changed; a locked state that prevents the relative displacement between the guide surface part and the guided part; and a released state. of Equipped with a switchable lock mechanism and a rear end of the link member has an arc-shaped toothed portion in which a plurality of toothed portions are arranged in an arc shape centered on the rotation support portion, the locking mechanism has an engagement portion in which a plurality of toothed portions are arranged and which can be engaged with the arc-shaped toothed portion, and the locking mechanism is configured such that a locking member capable of engaging and disengaging the engagement portion with the link member is provided on the seat back, and the locking mechanism is capable of setting the locked state by engaging the locking member with the link member in a state in which the guided portion is located at a midpoint between the front end and the rear end of the guide surface portion. It is characterized by the following.

[0008] According to this configuration, the following effects can be obtained. First, when the lock mechanism is set to the locked state, the position and / or posture of the seat cushion can be changed in conjunction with a change in the upright angle of the seat back. On the other hand, when the lock mechanism is released from the locked state, the seat back can be moved without being moved in conjunction with the seat cushion. In this way, according to the present invention, it is possible to appropriately achieve both changing the setting state of the seat back and the seat cushion in conjunction with each other, and changing the angle of the upright posture of the seat back independently without interlocking the seat back and the seat cushion. Therefore, it is possible to provide excellent flexibility and convenience when setting the seat back and the seat cushion to a desired state. According to the present invention, a mode in which the position and posture of the seat cushion are changed in conjunction with changes in the seat back's upright angle can be set regardless of the seat back's upright angle, thereby providing even greater versatility and convenience.

[0009] Other features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1A is a schematic side view showing an example of a vehicle seat according to the present invention, FIG. 1B is an enlarged view of a main part of FIG. 1A, and FIG. 1C is an explanatory view of a main part of FIG. 1B in a partially operated state. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0012] 1 is, for example, a rear seat of an automobile, and is mounted on a floor portion 9 of the passenger compartment of the automobile. This vehicle seat A includes a seat cushion 1, a seat back 2, a reclining device C1 that allows the upright angle of the seat back 2 to be changed, a link member 3, a guide mechanism C2, and a lock mechanism C3.

[0013] The seat back 2 is supported by a rotation support part 59, and the upright angle of the seat back 2 can be changed by rotating around the rotation support part 59. The rotation support part 59 is, for example, a substantially horizontal support shaft supported by a base part 40 fixed to a step part 90 of a floor part 9.

[0014] The reclining device C1 is a device that enables the setting of a changeable upright angle of the seat back 2. The reclining device C1 of this embodiment itself is a conventionally known device, and therefore its details will be described briefly.

[0015] That is, in this reclining device C1, in the normal state, as shown in FIG. 1(b), the engaging portion 51a of the engaging member 51 engages with the arc-shaped toothed portion 5a of the sector-shaped ratchet 5 attached to the rotation support portion 59. This prevents the sector-shaped ratchet 5 from rotating. Meanwhile, the sector-shaped ratchet 5 is fixed to a side plate frame 52 attached to the side portion of the seat back 2. Therefore, in the normal state, the rotation of the seat back 2 (change in the upright angle) is prevented. The engaged state between the arc-shaped toothed portion 5a and the engaging portion 51a is maintained by a cam 54 that rotates in conjunction with the operating lever 53 pressing the engaging member 51 against the arc-shaped toothed portion 5a, and the elastic force of a spring 55 is used as the pressing force.

[0016] On the other hand, when the operating lever 53 is lifted in the direction indicated by the arrow Na against the elastic force of the spring 55, the cam 54 descends in the direction indicated by the arrow Nb with the pin 57 as the fulcrum. As a result, the engaging member 51 rotates about the shaft portion 58 in a direction away from the sectorial ratchet 5, and the engagement state between the arc-shaped tooth portion 5a and the engaging portion 51a is released. In this state, the sectorial ratchet 5 is rotatable, and when a user (seater) of the vehicle seat A leans against the seat back 2, When the user releases the operating lever 53 after the seat back 2 is raised, the seat back 2 is prevented from rotating at the angle at which the user desires. In addition, a damper or the like may be used instead of the spring 56.

[0017] The link member 3 is a member for connecting the seat back 2 to the seat cushion 1 or a support member of the seat cushion 1 so that the position and / or posture of the seat cushion 1 is changed in conjunction with a change in the upright angle of the seat back 2. In this embodiment, the front part of the seat cushion 1 is supported via an auxiliary link member 10, and the front end part of the link member 3 is connected to a connecting shaft part 11 (corresponding to a specific example of a support member in the present invention) between the upper part of the auxiliary link member 10 and the seat cushion 1. The rear end part of the link member 3 is curved in an arc shape when viewed from the side, and this part is provided with an arc-shaped long hole 6 and an arc-shaped tooth part 30, which will be described later.

[0018] The guide mechanism C2 is a guide mechanism for maintaining a constant relative relationship between the seat back 2 and the link member 3, and is equipped with an arc-shaped long hole 6 provided in the link member 3 and a guided pin 7 that enters this arc-shaped long hole 6. The arc-shaped long hole 6 has a pair of arc-shaped guide surfaces 6a, 6b on its inner peripheral wall surface. The pair of arc-shaped guide surfaces 6a, 6b correspond to a specific example of a "guide surface portion" according to the present invention, and are arc-shaped with an appropriate radius of curvature R centered on the rotation support portion 59 in side view. The guided pin 7 corresponds to a specific example of the "guided portion" of the present invention. The guided pin 7 is fixed to the holder 4 attached to the side plate frame 52, and when the upright angle of the seat back 2 is changed, the guided pin 7 can be displaced (relatively displaced) in the longitudinal direction within the arc-shaped long hole 6 while being guided by the arc-shaped guide surfaces 6a, 6b.

[0019] The locking mechanism C3 is a mechanism that can switch between a locked state, in which the guided pin 7 is prevented from being displaced in the longitudinal direction within the arc-shaped slot 6, and a released state. Specifically, the locking mechanism C3 includes an arc-shaped toothed portion 30 provided on the upper portion of the rear end portion of the link member 3, and a locking member 8 that can engage with the arc-shaped toothed portion 30. The arc-shaped toothed portion 30 is a portion in which a plurality of teeth, such as a mountain-shaped toothed portion, are arranged in an arc shape centered on the rotation support portion 59 in a side view.

[0020] The locking member 8 of the locking mechanism C3 is held by the holder 4 in a state in which it can be raised and lowered as shown by the arrow N1, and the lower part of the locking member 8 is provided with a plurality of tooth-shaped (or one protrusion-shaped) engagement parts 80 that can be engaged with the arc-shaped tooth parts 30. As shown in Figs. 1(b) and 2, when the locking member 8 is lowered, the engagement parts 80 engage with the arc-shaped tooth parts 30, and as a result, the seat back 2 and the rear end part of the link member 3 are in a pseudo-fixed state (locked state) so that the guided pin 7 is prevented from being displaced in the arc-shaped long hole 6. On the other hand, as shown in Fig. 1(c), when the locking member 8 is raised by operating it manually, the engagement part 80 and the arc-shaped tooth parts 30 are disengaged, and the above-mentioned unlocked state is achieved. In this state, the guided pin 7 is displaced in the arc-shaped long hole 6, and the upright angle of the seat back 2 can be changed.

[0021] 2, a spring 87 is provided that resiliently biases the locking member 8 with an appropriate force F toward the arcuate toothed portion 30. With this configuration, it is possible to prevent the locking member 8 from inadvertently rising due to vibrations of the vehicle or the like.

[0022] Next, the operation of the vehicle seat A will be described.

[0023] 1(b) and 2, in a locked state in which the engagement portion 80 of the locking member 8 is engaged with the arc-shaped tooth portion 30 of the link member 3, when the upright angle of the seat back 2 is changed, the link member 3 is displaced accordingly, and as a result, the position and / or posture of the seat cushion 1 changes. Therefore, the respective setting states of the seat back 2 and the seat cushion 1 can be easily and quickly changed simultaneously.

[0024] 1(c), when the locking member 8 is raised and the engaging portion 80 is separated from the arc-shaped tooth portion 30 to enter an unlocked state, even if the upright angle of the seat back 2 is changed, the guided pin 7 merely displaces within the arc-shaped long hole 6 of the link member 3, and the link member 3 does not displace. Therefore, it is possible to change only the upright angle of the seat back 2, without changing the position or posture of the seat cushion 1.

[0025] In this way, in this vehicle seat A, it is possible to appropriately achieve both changing the setting state of the seat back 2 and the seat cushion 1 in conjunction with each other, and changing the angle of the upright posture of the seat back 2 independently without linking the seat back 2 and the seat cushion 1. Furthermore, in this vehicle seat A, the engaging portion 80 of the locking member 8 can be engaged with and disengaged from the arc-shaped teeth portion 30 to set the above-mentioned locked state and released state, regardless of the angle at which the seat back 2 is upright. This provides excellent versatility and convenience when the user sets the seat back 2 and the seat cushion 1 to a desired state.

[0026] The present invention is not limited to the above-described embodiment, and the specific configuration of each part of the vehicle seat according to the present invention can be freely modified in various ways within the intended scope of the present invention.

[0027] In the above embodiment, the arc-shaped long hole 6 is provided in the link member 3, and the guided pin 7 is provided in the seat back 2 (they are indirectly provided, but the present invention includes such an embodiment), but the present invention is not limited to this. It is also possible to configure the arc-shaped long hole 6 on the seat back 2 side, and the guided pin 7 on the link member 3.

[0028] In the above embodiment, the guide surface portion according to the present invention is provided as a pair of inner wall surface portions of the arc-shaped long hole 6, and the guided portion is provided as the guided pin 7 inserted into the arc-shaped long hole 6, but the present invention is not limited to this. The guide surface portion according to the present invention may be provided as an inner wall surface portion of an arc-shaped groove instead of an arc-shaped long hole, or may be provided as a simple stepped wall surface portion having an arc shape in side view. The guided portion may be in a shape other than a pin shape. In the above-described embodiment, when the locking member 8 is raised, the operating lever 53 is further operated. However, in the present invention, a linking operation device can be provided so that the operating lever 53 is linked (operates automatically) with the raising operation of the locking member 8.

[0029] Various mechanisms can be used as the locking mechanism. For example, in FIG. 2, a flange portion 70 for preventing the guided pin 7 from coming off is provided at the tip of the guided pin 7. Here, if the portion corresponding to this flange portion 70 is changed to a pressing member separate from the guided pin 7 and this pressing member is configured to be able to be pressed against the side surface of the link member 3, it is possible to lock the guided pin 7 and the link member 3. If the pressure is reduced, the locked state can be released. The locking mechanism in the present invention can be configured in such a way, for example.

[0030] The vehicle seat according to the present invention is not limited to a rear seat, but can also be applied to a front seat, and the specific mounting position and type are not important. [Explanation of symbols]

[0031] A Vehicle seat C3 Locking Mechanism 1 seat cushion 11 Connecting shaft portion (support member) 2 Seat back 3 Link member 30 Circular tooth 59 Rotation support part 6 Circular slot 6a, 6b Arc-shaped guide surface (guide surface portion) 7 Guided pin (guided part) 8 Locking parts

Claims

[Claim 1] A seat back that can change its upright angle by rotating around a rotation support portion; a link member for connecting the seat back to the seat cushion or a support member for supporting the seat cushion so that the position and / or posture of the seat cushion can be changed in conjunction with a change in the upright angle of the seat back; A vehicle seat comprising: a guide surface portion that is provided on either one of the seat back or the link member and has an arc shape with the rotation support portion as a center; a guided portion that is provided on the other of the two and that is capable of being relatively displaced so as to be displaced along the guide surface portion when the upright angle of the seat back is changed; a lock mechanism that can be switched between a locked state that prevents the relative displacement between the guide surface portion and the guided portion and a released state; It is equipped with a rear end portion of the link member having an arc-shaped tooth portion in which a plurality of teeth are arranged in an arc shape centered on the rotation support portion, the lock mechanism has an engagement portion having a plurality of teeth arranged thereon that are engageable with the arc-shaped toothed portion, The locking mechanism is configured such that a locking member capable of engaging and disengaging the engagement portion with the link member is provided on the seat back, and the locked state can be set by engaging the locking member with the link member when the guided portion is positioned midway between the front and rear ends of the guide surface portion.

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