JP2020100282A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat capable of quickly locking a displacing part at a specified fixing position.SOLUTION: A vehicle seat includes a seat cushion, a seat back, a frame that supports the seat cushion and the seat back, and a lock mechanism that locks a moving portion provided on the seat cushion or the seat back at a specified fixing position. The moving portion is supported so as to displace with respect to the frame. The lock mechanism has a lock portion that can displace between a lock state regulating the displacement of the moving portion and a releasing state releasing the regulation, a spring that energizes the lock portion so as to displace to the lock state, and a regulating portion that regulates the displacement to the lock state of the lock portion. The lock portion displaces to the lock state while transmitting force to the moving portion.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to vehicle seats.

Among seats arranged in vehicles such as automobiles, there is known a seat in which a part of a seat cushion or a seat back is displaceable with respect to a frame according to a posture of a seated person (see Patent Document 1).

International Publication No. 2013/021497

In the seat, it may be required to fix the displaced portion at a specific position (for example, the center position) and lock the displaced portion according to the state of the vehicle. However, in the method of waiting for damping of the movement of the displaced portion and then locking, it takes time to lock.

An aspect of the present disclosure is to provide a vehicle seat that can quickly lock a displaced portion at a specific fixed position.

One aspect of the present disclosure is a seat cushion (2), a seat back (3), a frame (4,5) that supports the seat cushion (2) and the seat back (3), a seat cushion (2), or a seat. A vehicle seat (1) comprising: a lock mechanism (7A, 7B) for locking a movable part (2A, 3A) provided on a back (3) at a specific fixed position. The movable parts (2A, 3A) are displaceably supported with respect to the frames (4,5).

The lock mechanism (7A, 7B) includes a lock part (71) displaceable between a locked state for restricting displacement of the movable part (2A, 3A) and a released state where the restriction is released, and a lock part (71). A spring (72) for urging the lock portion (71) so that the lock portion (71) is displaced into the locked state and a regulation portion (73) for regulating the displacement of the lock portion (71) into the locked state are included. The lock part (71) is displaced to the locked state while transmitting a force to the movable parts (2A, 3A).

According to such a configuration, when the restriction by the restriction part (73) is released, the lock part (71) transmits the force to the movable parts (2A, 3A) by the elastic force of the spring (72). It shifts to the locked state while reducing the displacement. Therefore, the movable parts (2A, 3A) can be quickly locked at a specific fixed position.

In one aspect of the present disclosure, the lock portion (71) may regulate the displacement of the movable portion (2A, 3A) by sandwiching a part of the movable portion (2A, 3A). With such a configuration, the movable portion (2A, 3A) can be locked easily and reliably while transmitting the force to the movable portion (2A, 3A).

In one aspect of the present disclosure, the lock part (71) may include a first link (71A) and a second link (71B) rotatably connected to the first link (71A). .. The first link (71A) and the second link (71B) may sandwich a part of the movable portion (2A, 3A) by the bias of the spring (72). With such a configuration, the sandwiching function of the movable portions (2A, 3A) can be realized with a relatively simple configuration.

In one aspect of the present disclosure, the movable part (2A, 3A) may have a convex part (22, 32) sandwiched by the lock part (71). According to such a configuration, the movable parts (2A, 3A) can be more reliably locked by being sandwiched.

In one aspect of the present disclosure, the lock part (471) includes a wire (471A) connected to the movable part (2A, 3A) and a tension adjusting mechanism (471B) that adjusts the tension of the wire (471A). You may. The spring (472) may urge the tension adjusting mechanism (471B) to be displaced to a locked state in which the slack of the wire (471A) is eliminated. Even with such a configuration, the movable portion (2A, 3A) can be locked easily and reliably while transmitting the force to the movable portion (2A, 3A).

In one aspect of the present disclosure, the tension adjustment mechanism (571B) may wind the wire (571A) by rotation. With such a configuration, the lock mechanism using the wire can be downsized.

One aspect of the present disclosure may further include an auxiliary lock mechanism (9) that locks the displacement of the movable portion (2A, 3A) by engaging the movable portion (2A, 3A) in the fixed position. With such a configuration, the movable parts (2A, 3A) can be locked more reliably.

It should be noted that the reference numerals in the above parentheses are examples showing the correspondence with the specific configurations and the like described in the embodiments described later, and the present disclosure is limited to the specific configurations and the like indicated by the reference numerals in the parentheses. Not something.

FIG. 1 is a schematic perspective view showing a vehicle seat according to an embodiment. FIG. 2 is a schematic perspective view showing a frame of the vehicle seat of FIG. FIG. 3A is a schematic diagram showing the first locking mechanism in the released state of the vehicle seat of FIG. 1, and FIG. 3B is a schematic diagram showing the first locking mechanism of the vehicle seat in FIG. 1 in the locked state. FIG. 4A is a schematic view showing the second lock mechanism in the released state of the vehicle seat of FIG. 1, and FIG. 4B is a schematic view showing the second lock mechanism of the vehicle seat in FIG. 1 in the locked state. FIG. 5 is a schematic view showing a lock mechanism in an embodiment different from that of FIG. FIG. 6 is a schematic diagram showing a lock mechanism in an embodiment different from FIGS. 2 and 5. FIG. 7 is a schematic view showing a lock mechanism in an embodiment different from those in FIGS. 2, 5 and 6. FIG. 8 is a schematic view showing a lock mechanism in an embodiment different from those in FIGS. 2, 5, 6, and 7. FIG. 9 is a schematic view showing a lock mechanism in an embodiment different from those in FIGS. 2, 5, 6, 7 and 8. 10A is a schematic diagram showing a lock mechanism in a released state in an embodiment different from FIGS. 2, 5, 6, 7, 8 and 9, and FIG. 10B is a lock state shown in FIG. 10A. It is a schematic diagram which shows a mechanism. FIG. 11A is a schematic view showing the auxiliary lock mechanism, and FIG. 11B is a schematic end view of a cut section taken along line XIB-XIB of FIG. 11A.

Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
The vehicle seat 1 shown in FIGS. 1 and 2 includes a seat cushion 2, a seat back 3, a cushion frame 4 supporting the seat cushion 2, a back frame 5 supporting the seat back 3, and a first locking mechanism 7A. A second lock mechanism 7B, a first motor 8A, and a second motor 8B.

The vehicle seat 1 of this embodiment is used as a seat for a passenger car. In addition, the directions in the following description and the drawings mean directions in a state where the vehicle seat 1 is assembled to a vehicle (that is, a passenger car). In addition, in the present embodiment, the seat width direction corresponds to the left-right direction of the vehicle, and the seat front corresponds to the front of the vehicle.

The seat cushion 2 is a part for supporting the buttocks of a seated person. The seat cushion 2 has a second movable portion 2A that is displaceable with respect to the cushion frame 4. The seat back 3 is a part for supporting the back of a seated person. The seat back 3 has a first movable portion 3A that is displaceable with respect to the back frame 5.

The first movable portion 3A of the seat back 3 has a movable frame 31 independent of the back frame 5. The movable frame 31 is swingably supported by the back frame 5. The first movable portion 3A of the seat back 3 swings with respect to the back frame 5 about an axis that intersects the front surface of the seat back 3 (that is, the surface that supports the back of the seated person).

The second movable portion 2A of the seat cushion 2 has a movable pan 21 independent of the cushion frame 4. The movable pan 21 is swingably supported by the cushion frame 4. The second movable portion 2A of the seat cushion 2 swings with respect to the cushion frame 4 about an axis intersecting the seat surface.

<First lock mechanism>
The first lock mechanism 7A locks the first movable portion 3A at a specific fixed position. As shown in FIG. 3A, the first lock mechanism 7A has a lock portion 71, a spring 72, and a restriction portion 73.

The lock portion 71 is a member that is displaceable between a locked state in which the displacement of the first movable portion 3A of the seat back 3 is restricted and a released state in which the restriction is released. In the present embodiment, the lock portion 71 regulates the displacement of the first movable portion 3A by sandwiching a part of the first movable portion 3A.

In addition, the first movable portion 3A of the present embodiment has the first convex portion 32 that projects rearward of the seat. The 1st convex part 32 is comprised by the member which connected the several pin with the board|plate material, a single pin, etc., for example. The lock portion 71 regulates the displacement of the first movable portion 3A by sandwiching the first convex portion 32. The first convex portion 32 is provided on the movable frame 31, and swings in the seat width direction as the first movable portion 3A swings. Further, the first convex portion 32 is arranged at a portion located at the center of the seat back 3 in the seat width direction in the locked state.

The lock portion 71 has a first link 71A and a second link 71B that is rotatably connected to the first link 71A.

The first link 71A rotates around a first shaft portion 71C fixed to the back frame 5 (not shown in FIG. 3A). The first link 71A has a first sandwiching portion 71F extending from the first shaft portion 71C to above the first convex portion 32, and a contact portion 71H extending below the first shaft portion 71C.

The second link 71B rotates around the second shaft portion 71D fixed to the back frame 5. The second link 71B has a second holding portion 71G extending from the second shaft portion 71D to above the first convex portion 32. The second sandwiching portion 71G is arranged at a position facing the first sandwiching portion 71F with the first protrusion 32 interposed therebetween.

The first link 71A and the second link 71B are connected by a third shaft portion 71E. The third shaft portion 71E is not fixed to the back frame 5 and is movable at least in the vertical direction.

When the first link 71A is rotated from the state of FIG. 3A so that the first pinching portion 71F of the first link 71A approaches the first convex portion 32, the second pinching portion 71G moves toward the first convex portion 32 in the first direction. The 2 link 71B rotates.

As a result, as shown in FIG. 3B, the first link 71A and the second link 71B sandwich the first protrusion 32 in the swing direction (that is, the seat width direction). As a result, the first movable portion 3A is locked at the position where the center of gravity of the first movable portion 3A comes to the center in the seat width direction (that is, the center position). In this way, the lock portion 71 is displaced to the locked state while transmitting the force to the first movable portion 3A.

The spring 72 urges the lock portion 71 to be displaced in the locked state. In the present embodiment, the spring 72 has the first end attached to the third shaft portion 71E and the second end fixed to the back frame 5. In addition, in the present embodiment, the spring 72 is arranged such that the central axis is in the vertical direction, but the direction of the spring 72 is not limited to this.

The spring 72 is arranged so that a downward elastic force acts on the third shaft portion 71E in the released state of FIG. 3A. Therefore, in the locked state of FIG. 3B, the first link 71A and the second link 71B sandwich the first convex portion 32 by the bias of the spring 72. That is, in the locked state, the positions of the first link 71A and the second link 71B are held by the elastic force of the spring 72.

The restriction portion 73 is a member that restricts the displacement of the lock portion 71 to the locked state. In the present embodiment, the restriction portion 73 is composed of a cam rotatably attached to the back frame 5.

In the released state of FIG. 3A, the restricting portion 73 abuts against the pin 71I provided on the abutting portion 71H of the first link 71A from above, whereby the abutting portion 71H moves upward, and thus the first link 71A. Also, the rotation of the second link 71B is restricted.

When the regulating portion 73 stops contacting the pin 71I due to the rotation of the regulating portion 73, the regulation of the first link 71A and the second link 71B is released, and the elastic force of the spring 72 causes the first link 71A and the second link 71B to be released. Shifts to the locked state of FIG. 3B.

When the restricting portion 73 further rotates from the locked state of FIG. 3B, the restricting portion 73 again contacts the pin 71I and pushes the contact portion 71H downward. As a result, the first link 71A and the second link 71B shift to the released state of FIG. 3A.

The restriction portion 73 is rotationally driven by the first motor 8A and is displaced between a restriction position in which the lock portion 71 is in contact with the restriction portion 73 and a release position in which the lock portion 71 is not in contact. The restriction unit 73 may be rotated by power such as air pressure and hydraulic pressure, or manually.

<Second lock mechanism>
The second lock mechanism 7B locks the second movable portion 2A at a specific fixed position. The second lock mechanism 7B includes a lock portion 71, a spring 72, and a restriction portion 73, as shown in FIG. 4A.

The lock portion 71, the spring 72, and the restriction portion 73 have the same functions as the first lock mechanism 7A. In the second lock mechanism 7B, the first shaft portion 71C and the second shaft portion 71D are fixed to the cushion frame 4 (not shown in FIG. 4A).

The lock portion 71 regulates the displacement of the second movable portion 2A by sandwiching a part of the second movable portion 2A of the seat cushion 2. The 2nd movable part 2A of this embodiment has the 2nd convex part 22 projected to the seat back.

The lock portion 71 restricts the displacement of the second movable portion 2A by sandwiching the second convex portion 22. The second convex portion 22 is provided on the movable pan 21, and swings in the seat width direction as the second movable portion 2A swings. Further, the second convex portion 22 is arranged at a portion located at the center of the seat cushion 2 in the seat width direction in the locked state.

When the first link 71A is rotated from the state of FIG. 4A in the direction in which the first holding portion 71F of the first link 71A approaches the second convex portion 22, the second holding portion 71G moves in the direction toward the second convex portion 22. The 2 link 71B rotates.

As a result, as shown in FIG. 4B, the second link 21A is sandwiched by the first link 71A and the second link 71B from the swinging direction, and the center of gravity of the second movable section 2A comes to the center in the seat width direction. The second movable portion 2A is fixed to.

The spring 72 has a first end attached to the first holding portion 71F of the first link 71A and a second end fixed to the cushion frame 4. In the released state of FIG. 4A, the spring 72 is arranged so that a leftward (that is, a direction toward the second convex portion 22) elastic force acts on the first holding portion 71F.

The restriction portion 73 is rotatably attached to the cushion frame 4. The restricting portion 73 is rotationally driven by the second motor 8B and is displaced between a restricting position where it abuts the lock portion 71 and a release position where it does not abut the lock portion 71. The restriction portion 73 of the second lock mechanism 7B may be rotated by power such as air pressure and hydraulic pressure, or manually.

[1-2. effect]
According to the embodiment described in detail above, the following effects can be obtained.
(1a) When the restriction by the restriction portion 73 is released, the lock portion 71 is in the locked state while the elastic force of the spring 72 transmits the force to the first movable portion 3A or the second movable portion 2A to reduce the displacement. Move to. Therefore, the first movable portion 3A or the second movable portion 2A can be quickly locked at a specific fixed position.

(1b) By sandwiching the second convex portion 22 or the first convex portion 32 by the first link 71A and the second link 71B, the first movable portion 3A or the first movable portion 3A or the third movable portion 3A or the first movable portion 3A can be reliably and easily configured. It is possible to lock the first movable portion 3A or the second movable portion 2A while transmitting the force to the two movable portions 2A.

[2. Second Embodiment]
The vehicle seat of the second embodiment is the same as the vehicle seat 1 of FIG. 1 except for the lock mechanism. Therefore, the description of the configuration other than the lock mechanism is omitted.

The lock mechanism 17 shown in FIG. 5 includes a lock portion 171, a spring 172, a restricting portion 173, and a stopper 174. The functions of the lock portion 171, the spring 172, and the restriction portion 173 are similar to those of the lock portion 71, the spring 72, and the restriction portion 73 of FIG. The lock mechanism 17 can be used for both the seat back 3 and the seat cushion 2.

In the present embodiment, the lock portion 171 has a first link 171A and a second link 171B rotatably connected to the first link 171A. Each of the first link 171A and the second link 171B is a strip-shaped member.

The first link 171A and the second link 171B are connected by a shaft portion 171C at a central portion in the longitudinal direction. The shaft portion 171C is fixed to the back frame 5. In addition, in the first link 171A and the second link 171B, one end portion forms sandwiching portions 171D and 171E that sandwich the first convex portion 32, and the other end portion abuts on the regulating portion 173, that is, the contact portion 171F. 171G.

The holding portion 171D of the first link 171A and the holding portion 171E of the second link 171B are connected by a spring 172. The spring 172 urges the two sandwiching portions 171D and 171E toward each other, and simultaneously urges the two contact portions 171F and 171G toward each other.

The contact portions 171F and 171G have sliding bearings on the outer surface that slide with the regulating portion 173. The restriction portion 173 is arranged so as to be sandwiched between the two contact portions 171F and 171G. The restriction portion 173 is configured such that the distance between the two sliding contact portions 171F and 171G changes due to the rotation of the restriction portion 173.

The stopper 174 is fixed to the back frame 5 and is arranged between the first link 171A and the second link 171B and at a position more distant from the shaft 171C than the first protrusion 32.

The width of the stopper 174 in the sandwiching direction (that is, the sheet width direction) is larger than that of the first protrusion 32. Since the stopper 174 suppresses the deviation of the displacement amount between the first link 171A and the second link 171B, the centering of the first movable portion 3A can be reliably performed.

In the lock mechanism 17, the two contact portions 171F and 171G are separated from the first convex portion 32, and the two contact portions 171F and 171F are rotated by the rotation of the regulating portion 173 from the released state where the swing of the first convex portion 32 is not regulated. 171G shifts to the locked state in which the first convex portion 32 is sandwiched.

[3. Third Embodiment]
The vehicle seat of the third embodiment is the same as the vehicle seat 1 of FIG. 1 except for the lock mechanism. Therefore, the description of the configuration other than the lock mechanism is omitted.

The lock mechanism 27 shown in FIG. 6 has a lock portion 271, a spring 272, and a restriction portion 273. The functions of the lock portion 271, the spring 272, and the restriction portion 273 are similar to those of the lock portion 71, the spring 72, and the restriction portion 73 of FIG. The lock mechanism 27 can be used for both the seat back 3 and the seat cushion 2.

In the present embodiment, the lock portion 271 has a first link 271A and a second link 271B rotatably connected to the first link 271A.

The first link 271A rotates around a first shaft portion 271C fixed to the back frame 5. The first link 271A includes a first holding portion 271E extending from the first shaft portion 271C, a first gear portion 271G provided near the first shaft portion 271C, and a first holding portion 271E from the first shaft portion 271C. And a contact portion 271I extending to the opposite side.

The second link 271B rotates around the second shaft portion 271D fixed to the back frame 5. The second link 271B has a second holding portion 271F extending from the second shaft portion 271D, and a second gear portion 271H provided near the second shaft portion 271D.

The second gear portion 271H of the second link 271B meshes with the first gear portion 271G of the first link 271A. Therefore, the second link 271B rotates in the opposite direction as the first link 271A rotates. The first holding portion 271E and the second holding portion 271F are arranged so as to sandwich the first convex portion 32.

A spring 272 is attached to the contact portion 271I of the first link 271A. The spring 272 urges the first link 271A so that the first link 271A and the second link 271B rotate in a direction in which the two holding portions 271E and 271F approach each other.

In addition, a cam-shaped restricting portion 273 is in contact with the contact portion 271I, and restricts the rotation due to the bias of the spring 272. The lock mechanism 27 is switched between a released state and a locked state by the rotation of the restriction portion 273.

[4. Fourth Embodiment]
The vehicle seat of the fourth embodiment is the same as the vehicle seat 1 of FIG. 1 except for the lock mechanism. Therefore, the description of the configuration other than the lock mechanism is omitted.

The lock mechanism 37 shown in FIG. 7 has a lock portion 371, a spring 372, a restriction portion 373, and a bracket 374. The functions of the lock portion 371, the spring 372, and the restriction portion 373 are similar to those of the lock portion 71, the spring 72, and the restriction portion 73 of FIG. The lock mechanism 37 can be used for both the seat back 3 and the seat cushion 2.

In the present embodiment, the lock portion 371 has a first link 371A and a second link 371B rotatably connected to the first link 371A.

Each of the first link 371A and the second link 371B is a link in which two strip-shaped members are rotatably connected. The first link 371A and the second link 371B are connected at one end by a first shaft portion 371C. Further, the other end of the second link 371B is connected to the link on the opposite side of the first shaft 371C of the first link 371A by the second shaft 371D at the center of this link.

The first shaft portion 371C and the second shaft portion 371D are arranged so as to sandwich the first convex portion 32 along the first axis D1. That is, the first convex portion 32 is arranged in the space surrounded by the first link 371A and the second link 371B.

The second shaft portion 371D is fixed to the back frame 5. On the other hand, the first shaft portion 371C is arranged in the long hole 374A provided along the first axis D1 provided in the bracket 374 and is movable along the first axis D1. The bracket 374 is fixed to the back frame 5. A bearing or a sliding bearing may be provided in the long hole 374A.

A spring 372 is attached to the other end of the first link 371A. The spring 372 includes the first link 371A and the second link 371A in the direction in which the first shaft portion 371C is separated from the second shaft portion 371D (that is, the direction in which the space surrounded by the first link 371A and the second link 371B becomes smaller). The first link 371A is biased so that the link 371B rotates.

Further, a cam-shaped restricting portion 373 is in contact with the end portion of the first link 371A to which the spring 372 is attached, and restricts the rotation due to the bias of the spring 372. The lock mechanism 37 is switched between a released state and a locked state by the rotation of the restriction portion 373.

[5. Fifth Embodiment]
The vehicle seat of the fifth embodiment is the same as the vehicle seat 1 of FIG. 1 except for the lock mechanism. Therefore, the description of the configuration other than the lock mechanism is omitted.

The lock mechanism 47 shown in FIG. 8 includes a lock portion 471, a spring 472, and a restriction portion 473. The functions of the lock portion 471, the spring 472, and the restriction portion 473 are similar to those of the lock portion 71, the spring 72, and the restriction portion 73 of FIG. The lock mechanism 47 can be used for both the seat back 3 and the seat cushion 2.

In the present embodiment, the lock portion 471 has a wire 471A connected to the first movable portion 3A and a tension adjusting mechanism 471B for adjusting the tension of the wire 471A. The tension adjusting mechanism 471B has a first pulley 471C, a second pulley 471D, a third pulley 471E, and a tension portion 471F.

The wire 471A is connected to the first movable portion 3A at two positions facing each other in the swinging direction, is laid over the first pulley 471C, the second pulley 471D, and the third pulley 471E, and is fixed to the tension portion 471F. There is.

The first pulley 471C and the second pulley 471D are arranged so as to sandwich the first movable portion 3A in the swinging direction of the first movable portion 3A, and are fixed to the back frame 5. The third pulley 471E is fixed to the back frame 5 at the center in the seat width direction.

The pulling portion 471F is movable so that the distance from the first movable portion 3A changes. A spring 472 is connected to the tension portion 471F. The spring 472 biases the tension portion 471F in a direction in which the tension portion 471F separates from the first movable portion 3A. That is, the spring 472 biases the tension adjusting mechanism 471B so as to displace the tension adjusting mechanism 471B into a locked state in which the slack of the wire 471A is eliminated.

When the pulling portion 471F is in a position close to the first movable portion 3A (that is, the release position), the wire 471A has a slack sufficient for the first movable portion 3A to swing. On the other hand, when the pulling portion 471F is at a position far from the first movable portion 3A (that is, the lock position), the slack of the wire 471A disappears, and the first movable portion 3A is pulled by the wire 471A to both sides in the swinging direction. As a result, the swing of the first movable portion 3A is restricted. The lock portion 471 may have a plurality of wires 471A.

In the released state, a cam-shaped restricting portion 473 is in contact with the pulling portion 471F, and restricts the movement of the pulling portion 471F due to the bias of the spring 472. The lock mechanism 47 is switched between a released state and a locked state by the rotation of the restriction portion 473.

[6. Sixth Embodiment]
The vehicle seat of the sixth embodiment is the same as the vehicle seat 1 of FIG. 1 except for the lock mechanism. Therefore, the description of the configuration other than the lock mechanism is omitted.

The lock mechanism 57 shown in FIG. 9 includes a lock portion 571, a spring (not shown), and a restricting portion (not shown). The functions of the lock portion 571, the spring and the restriction portion are the same as those of the lock portion 71, the spring 72 and the restriction portion 73 of FIG. The lock mechanism 57 can be used for both the seat back 3 and the seat cushion 2.

In the present embodiment, the lock portion 571 includes a wire 571A connected to the first movable portion 3A and a tension adjusting mechanism 571B that adjusts the tension of the wire 571A. The wire 571A is fixed to at least two positions facing the first movable portion 3A in the swinging direction.

The tension adjusting mechanism 571B adjusts the tension of the wire 571A by winding the wire 571A by rotation. The spring of the lock mechanism 57 is a torsion spring incorporated in the tension adjusting mechanism 571B. This spring rotates the winding portion of the tension adjusting mechanism 571B in the direction of winding the wire 571A by the elastic force. Since the lock mechanism 57 has such a mechanism, it can be downsized.

In the unlocked state, the regulation unit regulates the rotation of the winding unit and regulates the winding of the wire 571A. In a state where the winding is restricted, the wire 571A has a slack enough for the first movable portion 3A to swing.

On the other hand, when the regulation of the regulation portion is released and the winding by the spring functions, the slack of the wire 571A is eliminated, and the swing of the first movable portion 3A is regulated. The lock part 571 may have a plurality of wires 571A.

[7. Seventh embodiment]
The vehicle seat of the seventh embodiment is the same as the vehicle seat 1 of FIG. 1 except for the lock mechanism. Therefore, the description of the configuration other than the lock mechanism is omitted.

The lock mechanism 67 shown in FIG. 10A includes two lock portions 671, a plurality of springs 672, two restricting portions 673, and a plurality of stoppers 674. The functions of the lock portion 671, the spring 672, and the restriction portion 673 are similar to those of the lock portion 71, the spring 72, and the restriction portion 73 of FIG. The lock mechanism 67 can be used for both the seat back 3 and the seat cushion 2.

FIG. 10A shows the configuration of one set on the right side of the two lock parts 671 and the two restricting parts 673. The lock mechanism 67 further includes, in addition to the lock portion 671 and the restriction portion 673 shown in FIG. 10A, a pair of left lock portion 671 and the restriction portion 673 that are symmetrical in the seat width direction.

The lock portion 671 has a space 671A in which the first convex portion 32 is inserted and a pin 671B with which the restriction portion 673 abuts. The space 671A has a size such that the first protrusion 32 can swing inside. It should be noted that another first convex portion 32 is inserted into the space 671A of the left lock portion 671.

The plurality of springs 672 bias the lock portion 671 inward in the seat width direction (that is, toward the center in the seat width direction).
The restriction portion 673 is a cam that rotates so as to slide with the pin 671B of the lock portion 671. The restriction portion 673 is attached to the back frame 5.

In a state where the distance between the rotation center of the restriction portion 673 and the pin 672B shown in FIG. 10A is large, when the distance between the rotation center of the restriction portion 673 and the pin 672B decreases due to the rotation of the restriction portion 673, the spring 672 urges The lock portion 671 moves inward in the seat width direction. Along with this, the first protrusion 32 on the right side is moved inward along the inner wall of the space 671A. Even in the left lock portion 671 (not shown), the left first convex portion 32 is brought inward by the same movement. As a result, the swing of the first movable portion 3A is restricted.

Further, the position of the lock portion 671 in the locked state is fixed by the plurality of stoppers 674 arranged on the inner side in the seat width direction with respect to the lock portion 671. Therefore, the first movable portion 3A can be locked at a specific fixed position.

[8. Other Embodiments]
Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above embodiments and can take various forms.

(8a) The vehicle seat 1 of the above embodiment locks the displacement of the first movable portion 3A or the second movable portion 2A by engaging the first movable portion 3A or the second movable portion 2A in the fixed position. It may further include an auxiliary lock mechanism.

For example, the auxiliary lock mechanism 9 shown in FIGS. 11A and 11B has an engagement portion 91, a cam 92, and a shaft portion 93. The engaging portion 91 is rotatably supported by the shaft portion 93. The engagement portion 91 has a U-shaped cross section, as shown in FIG. 11B.

The engaging portion 91 is inserted into a movable side opening 3B provided at a position overlapping the back frame 5 in the first movable portion 3A and a fixed side opening 5A provided at a position overlapping the movable side opening 3B in the back frame 5. It has a possible tip 91A.

The cam 92 moves the tip portion 91A of the engagement portion 91 by rotation, and when the tip portion 91A is engaged with the movable side opening 3B and the fixed side opening 5A (in a locked state (shown by a dotted line in FIG. 11B), the tip portion). 91A switches to the released state (shown by the solid line in FIG. 11B) separated from these openings.

Specifically, when the convex portion 92A of the cam 92 comes into contact with the rear end portion 91B on the side opposite to the front end portion 91A, the engaging portion 91 is supported by the convex portion 92A, and the front end portion 91A comes out of the opening. It is released.

Further, when the contact between the engaging portion 91 and the convex portion 92A disappears due to the rotation of the cam 92, the engaging portion 91 rotates so that the rear end portion 91B moves downward by its own weight, and the front end portion 91A moves. It engages with the opening 3B and the fixed side opening 5A.

The auxiliary lock mechanism 9 can more reliably lock the displacement of the first movable portion 3A or the second movable portion 2A. The power source for rotating the cam 92 of the auxiliary lock mechanism 9 is not particularly limited.

(8b) In the vehicle seat 1 of the above embodiment, the specific fixed position for locking the first movable portion 3A and the second movable portion 2A is not limited to the position where the center of gravity of each movable portion comes to the center in the seat width direction. Further, the displacement directions of the first movable portion 3A and the second movable portion 2A are not limited to those described above.

(8c) In the vehicle seat 1 of the above embodiment, the first movable portion 3A and the second movable portion 2A do not necessarily have to have the convex portions 32 and 22.
(8d) The vehicle seat 1 of the above embodiment does not necessarily need to include both the first lock mechanism 7A and the second lock mechanism 7B, and may include only one of the lock mechanisms.

(8e) The vehicle seat 1 of the above-described embodiment can be applied not only to the above-described seats for automobiles but also for seats for vehicles other than automobiles, such as railway vehicles, ships, and aircraft.

(8f) The functions of one constituent element in the above-described embodiment may be distributed as a plurality of constituent elements, or the functions of a plurality of constituent elements may be integrated into one constituent element. Moreover, you may omit a part of structure of the said embodiment. Further, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other above embodiment. It should be noted that all aspects included in the technical idea specified by the wording recited in the claims are embodiments of the present disclosure.

1... Vehicle seat, 2... Seat cushion, 2A... 2nd movable part, 3... Seat back,
3A... 1st movable part, 3B... movable side opening, 4... cushion frame,
5... Back frame, 5A... Fixed side opening, 7A, 7B... Lock mechanism,
8A, 8B... Motor, 9... Auxiliary lock mechanism, 21... Movable pan, 22... 2nd convex part,
31... Movable frame, 32... 1st convex part, 71... Lock part, 71A, 71B... Link,
71C, 71D, 71E... Shaft part, 71F, 71G... Clamping part, 71H... Contact part,
71I... pin, 72... spring, 73... regulation part, 91... engaging part, 91A... tip part,
91B... rear end part, 92... cam, 92A... convex part, 93... shaft part, 471A... wire,
471B... Tension adjusting mechanism.

Claims (7)

Seat cushion,
Seat back,
A frame supporting the seat cushion and the seat back,
A lock mechanism that locks a movable portion provided on the seat cushion or the seat back at a specific fixed position,
Equipped with
The movable portion is displaceably supported with respect to the frame,
The locking mechanism is
A lock state that regulates the displacement of the movable portion, and a lock portion that can be displaced into a released state in which the regulation is released,
A spring for urging the lock portion to be displaced to the locked state,
A restriction part for restricting the displacement of the lock part to the locked state,
Have
The vehicle seat, wherein the lock portion is displaced to the locked state while transmitting a force to the movable portion. The vehicle seat according to claim 1,
The vehicle seat, wherein the lock portion restricts displacement of the movable portion by sandwiching a part of the movable portion. The vehicle seat according to claim 2, wherein:
The lock part is
The first link,
A second link rotatably connected to the first link;
Have
The vehicle seat in which the first link and the second link sandwich a part of the movable portion by the bias of the spring. The vehicle seat according to claim 2 or claim 3,
The vehicle seat, wherein the movable portion has a convex portion sandwiched by the lock portions. The vehicle seat according to claim 1,
The lock part is
A wire connected to the movable part,
A tension adjusting mechanism for adjusting the tension of the wire,
Have
A seat for a vehicle, wherein the spring biases the tension adjusting mechanism so as to displace the tension adjusting mechanism into a locked state in which the wire is not loosened. The vehicle seat according to claim 5, wherein:
The tension adjusting mechanism is a vehicle seat in which the wire is wound by rotation. The vehicle seat according to any one of claims 1 to 6, wherein:
The vehicle seat further comprising an auxiliary lock mechanism that locks the displacement of the movable part by engaging the movable part in the fixed position.