JP7373415B2 - vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat, and in particular, the seat posture is a tip-up posture in which the seat cushion is flipped up toward the seat back side, and a dive-down posture in which the seat back is tilted toward the seat cushion side and stored in the lower level of the floor. This invention relates to a vehicle seat that can be changed to

The seat posture has been changed to a sitting position in which the driver can sit, a tip-up position in which the seat cushion is flipped up towards the seat back, and a dive-down position in which the seat back is folded towards the seat cushion and stowed at the bottom of the floor. Possible vehicle seats are known, an example of which is described in US Pat.

In the vehicle seat described in Patent Document 1, the seat cushion and the seat back are in an unlocked state in the dive-down position. This eliminates the need for the user to manually release the lock when transitioning from the dive-down position to the seated position, reducing the burden on the occupants.
This vehicle seat includes an unlock wire that has one end fixed to the floor hinge and the other end connected to a release cam that unlocks the seat back. Then, when the unlocked state in the dive-down position is changed from the seated position or tip-up position to the dive-down position, the lock release wire extends and the release cam rotates, making it impossible to lock by the lock plate. It has been realized.

Japanese Patent Application Publication No. 2005-212554

It is desired that the structure of the sheet be as simple as possible, making it easy and inexpensive to manufacture. From this point of view, the seat of Patent Document 1, which uses many parts such as the unlock wire, the outer tube through which it is inserted, the release cam, and the floor hinge, to achieve the unlocked state in the dive-down position, has a large number of parts. In many cases, manufacturing is not easy and the cost is high, so there is room for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle seat in which the seat cushion and seat back are unlocked in the dive-down position, and which is easy to manufacture and inexpensive.

In order to solve the above problems, the present invention has the following configuration.
1) A vehicle seat that includes a seat cushion and a seat back and is capable of changing its posture between three positions: a tip-up position in which the seat cushion is rotated to stand up, a seated position in which the seat cushion is rotated to lie down, and a dive-down position. ,
comprising a lock control mechanism that controls prohibition and permission of relative rotation between the seat cushion and the seat back;
The lock control mechanism includes:
a first gravity-dependent member that moves to a first position by gravity as the seat back rotates to stand up, and moves to a second position by gravity as the seat back rotates to fall down;
a locking member that prohibits the relative rotation in conjunction with the movement of the first gravity-dependent member to the first position, and allows the relative rotation in conjunction with the movement of the first gravity-dependent member to the second position;
a movement control member that controls prohibition and permission of movement of the first gravity-dependent member to the first position;
a second gravity-dependent member that moves by gravity as the seat back rotates and stands up to support movement of the first gravity-dependent member to the first position;
In the tip-up position in which the first gravity-dependent member is in the first position as permitted by the movement control member, the second gravity-dependent member is in a third position;
In this state, when an impact load toward the seat back side is input to the lock control mechanism, the second gravity-dependent member moves to the third position on the opposite side of the seat back due to inertia force. Move to position 4,
When the second gravity-dependent member is in the fourth position, the movement control member is not able to control the movement control member, and the locking member maintains the prohibition of the relative rotation. This is a vehicle seat.
2) the locking member and the first gravity-dependent member each rotate in conjunction around predetermined rotational axes;
1), wherein the second gravity-dependent member is a heavy object that can be moved by gravity along a predetermined path connecting at least the third position and the fourth position. It is a vehicle seat.
3) In the tip-up position in which the first gravity-dependent member is in the first position and the relative rotation is prohibited by permission of the movement control member, the locking member is caused to cause the relative rotation by an external force. 2) is characterized in that when it rotates in a direction that allows the rotation, the rotation is restricted by coming into contact with the first gravity-dependent member, and the relative rotation is maintained. This is the vehicle seat described.

According to the present invention, the seat cushion and the seat back are in an unlocked state in the dive-down position, and the manufacturing cost is easy and low.

FIG. 1 is a side view for explaining the seating position of a seat 51, which is an example of a vehicle seat according to an embodiment of the present invention. FIG. 2 is a side view for explaining the tip-up posture of the seat 51. FIG. 3 is a side view for explaining the dive-down posture of the seat 51. FIG. 4 is a schematic side view of the seat 51 in the seating position for explaining the lock control mechanism SK provided in the arm portion 5 of the seat 51. FIG. 5 is a first schematic side view in a tip-up attitude for explaining the operation of the lock control mechanism SK. FIG. 6 is a second schematic side view in a tip-up attitude for explaining the operation of the lock control mechanism SK. FIG. 7 is a schematic side view in a dive-down attitude for explaining the operation of the lock control mechanism SK. FIG. 8 is a schematic side view for explaining a state in which a forward impact force is applied to the seat 51 in the tip-up position. FIG. 9 is a schematic side view for explaining a state in which a forward static load is applied to the seat cushion 51C of the seat 51 in the tip-up position.

A vehicle seat according to an embodiment of the present invention will be explained using a seat 51 as an example.
FIG. 1 is a side view showing the frame structure of the seat 51 in a sitting position. FIG. 2 is a side view showing the frame structure etc. of the seat 51 in the tip-up position. FIG. 3 is a side view showing the frame structure and the like of the seat 51 in the dive-down position. In FIGS. 1 to 3, the outer shape of the sheet 51 is indicated by a chain double-dashed line.
Further, for convenience of the following explanation, each direction of front, rear, left, right, top and bottom is defined by arrows in each figure. The left-right direction is a direction perpendicular to the paper plane of FIGS. 1 to 3, and the front side of the paper plane is defined as the left side.

As shown in FIGS. 1 to 3, the seat 51 is rotatably connected to the floor base 1 fixed to the upper floor portion 61a of the vehicle about an axis CLa extending in the left-right direction with respect to the floor base 1. It has a pair of left and right support bases 2 and a seat back frame 3 whose base side is connected and fixed to each support base 2.

A seat back 51A is constituted by the seat back frame 3 and a cushion body 51Aa surrounding the seat back frame 3.
A headrest frame 4 is attached to the tip of the seat back frame 3 so as to be rotatable and removable.
A headrest 51B is configured by the headrest frame 4 and a cushion body 51Ba that surrounds the headrest frame 4. The headrest 51B is removable from the seatback 51A.
Therefore, the seat back 51A is rotatable about the axis CLa with respect to the floor base 1.

Further, as shown in FIGS. 1 and 2, the tip of the seat back frame 3 is engaged and locked with an engaging portion provided on a vehicle side member (not shown) to lock rotation of the seat back 51A. A locking mechanism SBL is provided.
The seat back 51A is automatically locked to a vehicle side member by a locking mechanism SBL when the seat back 51A is raised from a dive-down position to a seated position. Furthermore, when changing the posture of the seat 51 from the sitting position and the tip-down position to the dive-down position, the locking mechanism SBL is manually unlocked.

A curved arm portion 5 is connected to the longitudinal center portion of each of the pair of support bases 2 so as to be rotatable around an axis CLb extending in the left-right direction.
A seat cushion frame 6 is connected to the tips of the pair of left and right arm portions 5.
A seat cushion 51C is constituted by the seat cushion frame 6 and a cushion body 51Ca that surrounds the seat cushion frame 6.

On the opposite side of the seat cushion frame 6 from the seat back 51A, there are a standby posture (the posture shown in FIG. 2) that rotates around an axis CLc extending in the left-right direction and lies down along the seat cushion frame 6 (the posture shown in FIG. 2), and a standby posture. Legs 7 are provided that change their posture between a standing posture (the posture shown in FIG. 1) in which they are rotated and stood up. One end of a wire 14 (see FIG. 4), which will be described later, is connected to the leg 7, and the wire 14 is pushed and pulled by the rotation of the leg 7.

The seat 51 has three postures shown in FIGS. 1 to 3, namely, a tip-up posture (FIG. 2) in which the seat cushion is rotated to stand up, a sitting posture (FIG. 1) in which the seat cushion is rotated to lie down, and a dive-down posture. (Figure 3), it is possible to change the posture between the three postures.
A lock control mechanism SK is provided to control prohibition (lock) and permission (unlock) of relative rotation between the seat back 51A and the seat cushion 51C when changing the posture between the respective postures.
In this example, the main part of the lock control mechanism SK is arranged inside the arm part 5.

Next, the lock control mechanism SK and its operation will be explained in terms of posture and operation with reference to FIGS. 4 to 9.

<Sitting posture>
FIG. 4 is a schematic side view of the structure of the arm portion 5 in the sitting position, viewed from the side.
The arm portion 5 has a base portion 5a that serves as a support base for each member.
An arm bracket 11, a lock plate 12, and a trigger plate 13 are supported on the base portion 5a in order from the top in FIG. There is.
In FIGS. 4 to 9, the axes CL11 to CL13 whose positions do not change with respect to the base part 5a are shown by crosses that divide the circle into four parts, and the positions of the rotational axes that are movable with respect to the base part 5a are shown by crosses which do not divide the circle. It is shown as visually distinguishable.

The arm bracket 11 has a connecting portion 11a extending rearward and diagonally upward in FIG. 4 for connecting to the seat back frame 3, and a disc support portion 11b supported by the arm portion 5. A notch portion 11b1 is formed at a portion of the outer peripheral edge of the disk support portion 11b on the front upper side in FIG.

The lock plate 12 is rotatably supported around an axis CL12 located diagonally below the front in FIG. 4 with respect to the axis CL11, and has a protrusion 12a that protrudes so as to be able to enter and engage the notch 11b1. There is.
The lock plate 12 is rotationally biased in the counterclockwise direction in FIG. 4 (the direction in which the protrusion 12a approaches the disk support portion 11b) by a biasing member (such as a coil spring) not shown.
In the sitting position of the seat 51, the center of gravity position 12Gp (indicated by a black square) of the lock plate 12 is located diagonally below and behind the axis CL12.

The trigger plate 13 is supported so as to be rotatable around an axis CL13 located below the axis CL12 in FIG.
The trigger plate 13 has a wire locking portion 13a formed in front of the axis CL13 in FIG. 4, and an opening 13c which is a long hole inclined so that the front side is higher in the lower front of the axis CL13.

A so-called tycoon 14a on one end side of the wire 14 pulled out from the wire sleeve 15 is hooked on the wire locking portion 13a, and when the wire 14 is pulled into the wire sleeve 15 side, the trigger plate 13 is aligned with the axis CL13. It is designed to rotate counterclockwise. The wire 14 is inserted through the wire sleeve 15 and the other end thereof is connected to the leg portion 7 as described above.
When the legs 7 stand up, the wire 14 is pulled to the state shown in FIG. 4, and when the legs 7 are laid down on the seat cushion frame 6 side, the wires 14 are pushed out as shown in FIGS. 2 and 3. (see arrow DRa in FIG. 2).

The trigger plate 13 and the lock plate 12 are connected by a connection plate 18. Specifically, the lock plate 12 and the trigger plate 13 are interlocked with the rotation of one and the other rotates in the opposite direction by the connection plate 18.
The connecting plate 18 and the lock plate 12 are connected through a long hole 18a of the connecting plate 18.
In the seated posture, the center of gravity position 13Gp (indicated by a black square) of the trigger plate 13 is located forward of the axis CL13. As a result, the trigger plate 13 in the attitude shown in FIG. 4 is urged counterclockwise by gravity.

The lock control mechanism SK includes the base portion 5a, the arm bracket 11, the lock plate 12, and the trigger plate 13.
The base portion 5a is formed with a J-shaped opening 5b, which has an upside-down "J" shape in FIG.
Specifically, the J-shaped opening 5b includes a straight long opening 5b1, a short opening 5b2 that extends short and diagonally with respect to the long opening 5b1, and a curved connecting part 5b3 that connects them. It is said that

A weight 17, which is a heavy object, is arranged between the trigger plate 13 and the base portion 5a, and a small diameter portion 17a of the weight 17 is engaged with each opening 13c and J-shaped opening 5b.
The weight 17 is movable by its own weight within a movable range while being engaged with the opening 13c and the J-shaped opening 5b.

In the sitting position of FIG. 4, the weight 17 is at the lowest position guided by the J-shaped opening 5b, and the small diameter portion 17a of the weight 17 is urged to rotate counterclockwise by the pull of the wire 14 and gravity. The opening 13c of the trigger plate 13 is also engaged and guided.

With this configuration, since the legs 7 are erect in the sitting position, the trigger plate 13 is rotated counterclockwise in FIG. is now rotated clockwise.
As a result, the lock plate 12 is in the unlocked position where the protrusion 12a is separated from the notch 11b1 of the arm bracket 11.

In order to maintain this seating posture, the occupant operates the lock mechanism SBL to lock the rotation of the seat back frame 3.

<From seated position to tip-up position>
The occupant can maintain the seat 51 in the tip-up position by lifting the unlocked seat cushion 51C in the above-mentioned seating position, and then folding down the erect legs 7 to lie down. This will be explained in detail below.

In the seating position shown in FIG. 4, the protrusion 12a is detached from the notch 11b1 and is in the unlocked position, so the occupant can lift the seat cushion 51C by rotating it around the axis CL11 ( Figure 5 arrow DRb).
When the seat cushion 51C reaches the predetermined tip-up position, the protrusion 12a of the lock plate 12 moves to a position facing the notch 11b1, as shown in FIG.
Further, by the rotation of the arm portion 5 in the clockwise direction with respect to the axis CL11, the center of gravity position 13Gp of the trigger plate 13 moves to be located on the rear side of the vertical line SF13 passing through the axis CL13.
Further, since the J-shaped opening 5b of the base portion 5a changes from a low posture on the front side to a low posture on the rear side, the weight 17 tries to move rearward due to gravity, but the rotation of the trigger plate 13 is prevented by the wire. 14, and the opening 13c extends in a direction intersecting with the J-shaped opening 5b, so movement due to gravity is restricted.

Here, when the occupant lowers the standing leg 7, the wire 14 is pushed out (arrow DRa in FIG. 6) and the trigger plate 13 is allowed to rotate clockwise.
The trigger plate 13 rotates in the clockwise direction because the center of gravity position 13Gp has already moved to the rear side of the vertical line SF13 of the axis CL13.
Due to the movement (change in posture) of the opening 13c accompanying this rotation, the weight 17 is guided toward the lower rear side through the J-shaped opening 5b.

Therefore, the trigger plate 13 reliably rotates clockwise due to its own weight and the bias of the weight 17 (arrow DRc in FIG. 6), and with this rotation, the lock plate 12 is reciprocated via the connecting plate 18. The protrusion 12a engages with the notch 11b1 by interlocking rotation in the clockwise direction (arrow DRd).
In this way, the rotation of the seat cushion frame 6 integral with the arm portion 5 with respect to the seat back frame 3 is locked by the action of gravity. This maintains the tip-up position of the seat 51.

<From tip-up position to seated position>
The occupant first rotates and raises the legs 7 of the seat 51 in the tip-up position. As a result, the wire 14 is pulled toward the leg portion 7, the lock plate 12 shifts from the state shown in FIG. 6 to the unlocked state shown in FIG. 5, and rotation of the seat cushion 51C with respect to the seat back 51A is permitted.
The occupant can then fold down the raised seat cushion 51C to change the posture of the seat 51 to the sitting position.

<From tip-up position to dive-down position>
The occupant unlocks the locking mechanism SBL to enable the seat back 51A to rotate relative to the vehicle side member, and then moves the seat back 51A and the seat cushion 51C, which is in a rotationally locked state relative to the seat back 51A, to the axis of the floor base 1. It is rotated around CLa (arrow DRh in FIG. 7) and housed in the lower floor section 61b. The lock control mechanism SK in this dive-down attitude is shown in FIG.

During the rotation from the tip-up position to the dive-down position, the weight 17 moves to the opposite side (front side) inside the J-shaped opening 5b due to gravity (arrow DRe in FIG. 7). This movement of the weight 17 is performed when the trigger plate 13 is rotatable in the counterclockwise direction (arrow DRf) in FIG. It is permitted to enter the front area beyond line SF13.
The lock plate 12 rotates clockwise in conjunction with the rotation of the trigger plate 13 via the connection plate 18 (arrow DRg in FIG. 7). As a result, the protrusion 12a separates from the cutout portion 11b1, and the rotation of the seat back 51A is unlocked.

<From seated position to dive down position>
In the seated position, the occupant unlocks the lock mechanism SBL of the seat back 51A. As a result, the seat back 51A is unlocked from the vehicle side member.
On the other hand, since the seat back 51A is in an unlocked state with respect to the seat cushion 51C in the sitting position, the occupant can fold the seat back 51A forward and store the seat 51 in the lower floor section 61b.
Therefore, the unlocked state of the seat cushion 51C and the seat back 51A is maintained as is when changing the posture from the sitting posture to the dive-down posture.

As described in detail above, when the seat 51 is changed to the dive-down position from another position, the occupant performs a lock release operation when changing the position from the locked state of the seat cushion 51C and the seat back 51A. The lock is automatically released by moving the member using gravity. Further, when changing the posture from the unlocked state, the unlocked state is maintained as it is.

In other words, the lock control mechanism SK has the trigger plate 13 as a gravity dependent member. When the wire 14 is not restricted, the trigger plate 13 moves to the first position (the rotational position shown in FIG. 4) by gravity as the seatback 51A rotates to stand up, and when the seatback 51A rotates to fall down. Accordingly, it moves to the second position (rotated position shown in FIG. 7) by gravity.
Further, the lock control mechanism SK is a locking member that prohibits relative rotation when the trigger plate 13 moves to the first position, and allows relative rotation when the trigger plate 13 moves to the second position. It has a lock plate 12.
Furthermore, the lock control mechanism SK has a wire 14 that is a movement control member that controls prohibition and permission of movement of the trigger plate 13 to the first position.

The lock control mechanism SK also includes a weight 17, which is another gravity-dependent member that moves due to gravity as the seat back 51A rotates and stands up, and supports the movement of the trigger plate 13 to the first position.

The weight 17 is a heavy object that can be moved by gravity through the opening 16a serving as a predetermined path.

As a result, the seat 51 does not require a wire for unlocking the seat cushion 51C and the seat back 51A in the dive-down position, and unlocking parts such as a release cam and a floor hinge connected to the wire. , the number of parts is small, manufacturing is easy, and cost increases are suppressed.

Furthermore, the lock control mechanism SK is designed to prevent the seat cushion 51C from unlocking from the seat back 51A when the vehicle is in the tip-up position and a rear impact load is input to the seat 51 due to a frontal collision, for example. ing.

This will be explained with reference to FIGS. 6 and 8.
As shown in FIG. 6 illustrating the above-mentioned tip-up position, the J-shaped opening 5b of the base portion 5a is in a horizontal position in the front-rear direction in which the short opening 5b2 substantially overlaps the opening 13c of the trigger plate 13. The weight 17 is located at the rear end of the short opening 5b2.
When the vehicle running in this state collides head-on, the weight 17 attempts to move forward due to inertia, moves forward within the short opening 5b2 and the overlapping opening 13c, and moves forward at the front end of the short opening 5b2. Movement is regulated.
During this movement of the weight 17, no rotational force is applied to the trigger plate 13, so the protrusion 12a of the lock plate 12 does not come off the notch 11b1 of the arm bracket 11, and is maintained locked.

If the J-shaped opening 5b is a straight opening with only a long opening 5b1 without a short opening 5b2, the weight 17 moves forward and upward through the long opening 5b1 and closes the trigger plate 13. There is a risk that the lock will be released if the lock is rotated counterclockwise in FIG.
Therefore, the lock control mechanism SK effectively prevents unlocking due to a frontal collision in the tip-up position, and has improved impact resistance.

Further, the lock control mechanism SK is configured such that even when an external force is applied to the lock plate 12 in the direction of detaching the protrusion 12a from the notch 11b1 of the arm bracket 11 in the tip-up position, the protrusion 12a is not cut. It is difficult to separate from the notch portion 11b1.

This will be explained with reference to FIG.
In the tip-up position (FIG. 6), let us consider, for example, downward movement when a vehicle moves violently up and down while driving on a rough road.
Due to this downward movement, the lock plate 12 attempts to rotate clockwise around the axis CL12 because the center of gravity position 12Gp is on the front side of the vertical line SF12 passing through the axis CL12, and the lock plate 12 attempts to rotate clockwise around the axis CL12, within the operating margin of the coupling mechanism. Then, the protrusion 12a moves slightly in the direction of separation from the notch 11b1.

The trigger plate 13 is provided with an abutting protrusion 13d that protrudes toward the lock plate 12, and the lock plate 12 comes into contact with the abutting protrusion 13d before the protrusion 12a comes out of the notch 11b1. They abut at position P1 and further rotation is prohibited.
Further, a straight line Cp12 passing through the connection position P2 connecting the lock plate 12 and the connection plate and the contact position P1 is set to pass below the trigger plate 13 including the position of the axis CL13.
Therefore, even if the lock plate 12 contacts the contact protrusion 13d and is pushed forward, the trigger plate 13 does not rotate in the counterclockwise direction of the axis CL13.
Further, the trigger plate 13 has a regulating protrusion 13e formed above the abutting protrusion 13d in FIG. Rotation is restricted by contacting the plate 12.

With these rotation restriction structures, even if a force is applied to the lock plate 12 in a direction that causes the protrusion 12a to separate from the notch 11b1, the lock plate 12 will not rotate enough to separate from the notch 11b1. There is no risk of the protrusion 12a separating from the notch 11b1 and unlocking, except when excessive force is applied.
Therefore, the lock control mechanism SK satisfactorily prevents unlocking due to vertical movement in the tip-up position, and the locking performance is further improved.

The present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the gist of the present invention.

1 Floor base 2 Support base 3 Seat back frame 4 Headrest frame 5 Arm portion 5a Base portion, 5b J-shaped opening, 5b1 Long opening 5b2 Short opening, 5b3 Connection portion 6 Seat cushion frame 7 Leg portion 11 Arm bracket 11a Connection part, 11b disc support part, 11b1 notch part 12 lock plate, 12a protrusion 12Gp, 13Gp center of gravity position 13 trigger plate,
13a Wire locking portion, 13c Opening 14 Wire, 14a Tyco 15 Wire sleeve 17 Weight, 17a Small diameter portion 18 Connection plate, 18a Long hole 51 Seat 51A Seat back, 51B Headrest 51C Seat cushion 51Aa, 51Ba, 51Ca Cushion body 61a Floor Upper section, 61b Floor lower section CLa, CLb, CLc, CL11, CL12, CL13 Axis SBL Lock mechanism SF13, SF12 Vertical line SK Lock control mechanism

Claims (3)

A vehicle seat comprising a seat cushion and a seat back, and capable of changing its posture between three positions: a tip-up position in which the seat cushion is rotated to stand up, a seated position in which the seat cushion is rotated to fall down, and a dive-down position,
comprising a lock control mechanism that controls prohibition and permission of relative rotation between the seat cushion and the seat back;
The lock control mechanism includes:
a first gravity-dependent member that moves to a first position by gravity as the seat back rotates to stand up, and moves to a second position by gravity as the seat back rotates to fall down;
a locking member that prohibits the relative rotation in conjunction with the movement of the first gravity-dependent member to the first position, and allows the relative rotation in conjunction with the movement of the first gravity-dependent member to the second position;
a movement control member that controls prohibition and permission of movement of the first gravity-dependent member to the first position;
a second gravity-dependent member that moves by gravity as the seat back rotates and stands up to support movement of the first gravity-dependent member to the first position;
In the tip-up position in which the first gravity-dependent member is in the first position as permitted by the movement control member, the second gravity-dependent member is in a third position;
In this state, when an impact load toward the seat back side is input to the lock control mechanism, the second gravity-dependent member moves to the third position on the opposite side of the seat back due to inertia force. Move to position 4,
When the second gravity-dependent member is in the fourth position, the movement control member is not able to control the movement control member, and the locking member maintains the prohibition of the relative rotation. Seats for vehicles. The locking member and the first gravity-dependent member each rotate in conjunction with each other around a predetermined rotation axis,
2. The second gravity-dependent member is a heavy object that can be moved by gravity along a predetermined path connecting at least the third position and the fourth position. vehicle seat. In the tip-up position in which the first gravity-dependent member is in the first position and the relative rotation is prohibited by permission of the movement control member, the lock member allows the relative rotation by an external force. 3. The device is configured such that when the first gravity-dependent member rotates in a direction in which the first gravity-dependent member rotates, the rotation is regulated by contacting the first gravity-dependent member, and the relative rotation is maintained. vehicle seat.

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