JP2021130429A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat capable of inhibiting the vertical fluctuation of a seat back reclined forward on a seat cushion when reclining the seat back forward.SOLUTION: In a vehicle seat 10 equipped with a seat cushion 11 and a seat back 15, the seat back 15 is made to be capable of overlapping with the seat cushion 11 by reclining forward. The seat comprises a lock mechanism 30 locking the seat back 15 to fix the position thereof so as not to turn from the state in which the seat back 15 is overlapped with the cushion 11. In such a state that the forward-reclined seat back 15 is locked by the lock mechanism 30, the seat cushion 11 or seat back 15 is in a shrunk state, and a back face of the forward-reclined seat back 15 becomes nearly horizontal.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle seat.

As a vehicle seat such as a vehicle seat, a so-called dive-down type vehicle seat is known (see, for example, Patent Document 1).
The dive-down type vehicle seat is configured so that the seat back can be tilted forward (so-called falldown) and overlapped on the upper surface of the seat cushion, and both the seat back and seat cushion can be tilted further forward to dive down. Has been done.

Japanese Unexamined Patent Publication No. 2019-188842

By the way, the technique described in Patent Document 1 is applied to a hatchback. For example, when the falldown technique among these techniques is applied to a sedan or the like, the sheet of the sedan sheet 100 illustrated in FIG. 20A is illustrated. Since the cushion 101 and the seat back 102 are formed to be soft and highly flexible, when the seat back 102 is fallen down as shown in FIG. 20 (B), the seat back 102 tilted forward is the seat cushion. It is pushed back to 101 and swings up and down (so to speak, it moves swayingly).

However, when the seat back 102 tilted forward swings up and down, for example, when the load is placed on the upper side of the back surface 102a of the seat back 102 (the upper surface side in the state of FIG. 20B), it becomes difficult to load the load. The loaded luggage may become unstable. Further, for example, when a person lies on the back surface 102a of the seat back 102, the lying posture may not be stable and may cause discomfort.

The present invention has been made in view of the above circumstances, and is for a vehicle capable of suppressing the seat back tilted forward from swinging up and down on the seat cushion when the seat back is tilted forward. The purpose is to provide a seat.

In order to solve the above problems, the invention according to claim 1 is
In vehicle seats with seat cushions and seat backs
The seat back can be tilted forward and overlapped with the seat cushion.
A lock mechanism for locking and fixing the position of the seat back so that the seat back does not rotate from the state of being overlapped with the seat cushion is provided.
When the seat back that has fallen forward is locked by the lock mechanism, the seat cushion or the seat back is in a contracted state, and the back surface of the seat back that has fallen forward is configured to be substantially horizontal. It is characterized by being.

The invention according to claim 2 is the vehicle seat according to claim 1.
The locking mechanism includes an engaging portion and an engaged portion, and the locking mechanism includes an engaging portion and an engaged portion.
The seat back is locked and fixed in position by engaging the engaged portion with the engaged portion in a state where the seat back is tilted forward and overlapped with the seat cushion. ..

The invention according to claim 3 is the vehicle seat according to claim 2.
A lever is provided on the back side of the seat back.
The lever is connected to the engaging portion via a wire inserted into the seat back.
When the lever is operated, the engagement between the engaging portion and the engaged portion is released via the wire.

In the invention according to claim 4, in the vehicle seat according to any one of claims 1 to 3, the seat cushion does not move with respect to the floor, and only the seat back is tilted forward. It is characterized in that it is configured so that it can be overlapped with the seat cushion.

The invention according to claim 5 is the vehicle seat according to any one of claims 1 to 4.
An elastic member that can expand and contract in the vertical direction is arranged on the front side portion inside the seat cushion.
The telescopic member
When the seat back that has fallen forward is locked by the lock mechanism, it is in a contracted state.
The seat back is in an extended state when it is not locked by the lock mechanism.

The invention according to claim 6 is the vehicle seat according to claim 5.
When the seat back is tilted backward, the telescopic member is extended and the front side portion of the seat cushion is configured to rise upward.

The invention according to claim 7 is the vehicle seat according to any one of claims 1 to 4.
An elastic member that can be expanded and contracted in the vertical direction is arranged on the front side portion inside the seat back in a state of being tilted forward.
The telescopic member
When the seat back that has fallen forward is locked by the lock mechanism, it is in a contracted state.
The seat back is in an extended state when it is not locked by the lock mechanism.

The invention according to claim 8 is characterized in that, in the vehicle seat according to any one of claims 5 to 7, the telescopic member is configured so that its shrinkage rate can be adjusted. do.

The invention according to claim 9 is the vehicle seat according to any one of claims 5 to 8.
Plate-shaped members are arranged at both ends of the telescopic member, and both or at least one of the plate-shaped members is divided into left and right.
The telescopic member is arranged on each of the divided plate-shaped members.

The invention according to claim 10 is the vehicle seat according to any one of claims 1 to 9.
The telescopic member is configured by using an air cell.
The airbag is arranged in the air cell.

The invention according to claim 11 is the vehicle seat according to any one of claims 1 to 9.
The telescopic member is configured by using an air cell.
An inflator is arranged in the air cell.

The invention according to claim 12
A seat cushion composed of a seat cushion frame, a cushion pad provided on the seat cushion frame, and a skin covering the seat cushion frame and the cushion pad to form a seat surface.
A seat back composed of a seat back frame, a cushion pad provided on the seat back frame, and a skin covering the seat back frame and the cushion pad to form a seat surface.
In a vehicle seat equipped with
The seat back can be tilted forward and overlapped with the seat cushion.
A lock mechanism for locking and fixing the position of the seat back so that the seat back does not rotate from the state of being overlapped with the seat cushion is provided.
When the seat back that has fallen forward is locked by the lock mechanism, the seat cushion or the seat back is in a contracted state, and the back surface of the seat back that has fallen forward is configured to be substantially horizontal. It is characterized by being.

According to the inventions of claims 1 and 12, when the seat back is tilted forward and overlapped with the seat cushion, the lock mechanism works to prevent the seat back from rotating from the state of being overlapped with the seat cushion. Is locked and the position is fixed, so that when the seat back is tilted forward, it is possible to prevent the seat back tilted forward from swinging up and down on the seat cushion.
Therefore, even when the seat cushion or seat back is formed to be soft and highly flexible, such as a sedan seat, the lock mechanism allows the seat back tilted forward to move up and down on the seat cushion. It is accurately suppressed from swinging.
Further, since the back surface (upper surface) of the seat back that is tilted forward and locked is substantially horizontal, for example, the luggage placed on the seat back does not tilt and the luggage can be placed in a stable state.

According to the second aspect of the present invention, the engaging portion of the lock mechanism engages with the engaged portion in a state where the seat back is tilted forward and overlapped with the seat cushion, so that the seat back is securely locked. It is possible to fix the position.

According to the third aspect of the present invention, when the lever provided on the back surface side of the seat back is operated, the engaging portion and the engaged portion of the lock mechanism are disengaged, so that the seat back is tilted forward. The seat back can be easily unlocked by an occupant or the like.

According to the invention of claim 4, the vehicle seat is not only a dive-down type as described in Patent Document 1 described above, but also a fall-down type in which the seat back is simply tilted forward. However, it is possible to exert its beneficial effects.

According to the invention of claim 5, the elastic member that can expand and contract in the vertical direction is in the front side portion inside the seat cushion, and is in a contracted state when the seat back is tilted forward and locked. Even if the front side portion of the cushion is raised upward, the back surface (upper surface) of the seat back can be made substantially horizontal when the seat back tilted forward is locked.

According to the invention of claim 6, when the seat back is tilted backward and the reclining operation is performed, the elastic member is extended and the front portion of the seat cushion is raised upward, so that the occupant's body is in contact with the seat back. It is possible for the occupant to take a relaxed posture by suppressing the relative lowering.

According to the invention of claim 7, the elastic member that can be expanded and contracted in the vertical direction is in the front side portion inside the seat back, and is in a contracted state when the seat back is tilted forward and locked. Even if the front part of the seat is raised upward, the seat back side is deformed to correspond to the raised part of the front part of the seat cushion, so when locking the seat back that has been tilted forward, the back surface (upper surface) of the seat back ) Can be made almost horizontal.

According to the eighth aspect of the present invention, the contraction rate of the telescopic member can be changed according to the preference of the occupant, and the vehicle seat becomes comfortable for the occupant.

According to the invention of claim 9, since the divided plate-shaped members move independently by each expansion / contraction member, even if there are individual differences in the occupant's body, the sitting comfort is adjusted to the occupant's preference. It becomes possible to.

According to the invention of claim 10, by arranging the airbag of the air cell constituting the telescopic member, the elastic member including the air cell and the airbag can be arranged together in the front side portion inside the seat cushion. This makes it possible to properly operate the telescopic member and the airbag.

According to the invention of claim 11, the air cell constituting the telescopic member can be used as an airbag, and the air cell arranged on the front side portion inside the seat cushion can be appropriately used as the telescopic member and the airbag, respectively. It becomes possible to operate.

It is a side view which shows the structure of the vehicle seat which concerns on this embodiment. It is a figure which shows the structural example of the lock mechanism. (A) is a side view showing a state in which the seat back is locked by the lock mechanism, and is an enlarged view of a portion including the lock mechanism in (B) and (A). (A) It is a partial cross-sectional view of a state in which the seat back is superposed on a seat cushion having a built-in spring as an elastic member, and (B) a state in which the seat back is locked is seen from the side. It is a partial cross-sectional view. It is a figure which shows the example of the lever provided on the back side of a seat back. (A) A partial cross-sectional view of a seat back in which a spring as an elastic member is built in a seat cushion is superposed on the seat cushion, and (B) a state in which the seat back is locked is viewed from the side. It is a partial cross-sectional view. 6A is a view of the seat cushion of FIG. 6A viewed from above, and is a diagram showing a case where a single spring is provided and a case where a plurality of springs are provided. It is a figure which looked at the divided plate-shaped member and the like from above, and is the figure which shows (A) the state which the plate-shaped member was divided into two, and (B) the state which was divided into three. (A) is a partial cross-sectional view of an example of a stopper provided on a vehicle seat seen from the side, and (B) is a view seen from above. 9 is a partial cross-sectional view of the state when the seat back of the vehicle seat of FIG. 9A is tilted backward and the reclining operation is performed, as viewed from the side. (A) It is a partial cross-sectional view of a state in which the seat back is superposed on a seat cushion having an air cell as a telescopic member, and (B) a state in which the seat back is locked is seen from the side. It is a partial cross-sectional view. 11A is a view of the seat cushion of FIG. 11A viewed from above, and is a diagram showing a case where (A) a single air cell is provided and (B) a case where a plurality of air cells are provided. It is the figure which looked at the state which a plurality of air cells were connected by a pipe or the like from above. It is a partial cross-sectional view which looked at the state which the air cell as a telescopic member in a seat cushion and the air cell arranged in a seat back are connected by a pipe or the like from the side. It is a partial cross-sectional view which shows the modification of the structure shown in FIG. It is a partial cross-sectional view of (A) a state in which a seat back is superposed on a seat cushion having an air cell as an elastic member and a spring built-in, and (B) a state in which the seat back is locked from the side. It is a partial cross-sectional view as seen. 16A is a view of the seat cushion of FIG. 16A viewed from above, and is a diagram showing a case where a single spring is provided, and a case where a plurality of springs are provided. (A) is a partial cross-sectional view of a state in which an airbag is arranged inside an air cell as viewed from the side, and (B) and (A) are views of the seat cushions of (A) as viewed from above. (A) is a partial cross-sectional view of a state in which an inflator is arranged inside the air cell as viewed from the side, and is a view of the seat cushions of (B) and (A) as viewed from above. (A) is a side view showing an example of a seat of a sedan, and (B) is a side view showing a state in which the seat back is fallen down.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the technical scope of the present invention is not limited to the following embodiments and illustrated examples. No.
In the following, a case where the vehicle seat is a vehicle seat will be described. However, the vehicle seat may be, for example, an aircraft seat, a ship seat, or the like. It is not limited to the case where the seat is for a vehicle.
Further, although the case where the seat is a front seat will be described below, the seat may be a rear seat or the like.

FIG. 1 is a side view showing the configuration of a vehicle seat according to the present embodiment. In addition, in each figure below FIG. 1, the illustration of the headrest and the like is omitted. Further, F in FIG. 1 represents a floor.
As shown in FIG. 1, the vehicle seat 10 (hereinafter referred to as the seat 10) is a seat cushion 11 that supports the buttocks and thighs of the occupant, and stands behind the seat cushion 11 to serve as a backrest for the occupant. It includes a seat back 15 and a headrest (not shown) provided on the upper part of the seat back 15 to support the occupant's head.
In addition, an auxiliary support portion such as a necklace, an armrest, a footrest, or an ottoman may be provided.

The seat cushion 11 is mainly composed of a seat cushion frame 12 as a skeleton, a cushion pad 13 provided on the seat cushion frame 12, and a skin 14 that covers the seat cushion frame 12 and the cushion pad 13 to form a surface of the seat. It is configured in.
Further, the seat back 15 also covers the seat back frame 16 as a skeleton, the cushion pad 17 provided on the seat back frame 16, the seat back frame 16 and the cushion pad 17, and the skin 18 forming the surface of the seat. It is mainly composed of. A headrest pillar holding portion 19 for holding a headrest pillar of a headrest (not shown) is provided on the upper part of the seat back frame 16.

A reclining mechanism 20 for changing the angle of the seat back frame 16 with respect to the seat cushion frame 12 is provided between the rear end portion of the seat cushion frame 12 and the lower end portion of the seat back frame 16. The 12 and the seat back frame 16 are connected to each other via a reclining mechanism 20.
Further, the reclining mechanism 20 has a built-in winding spring (not shown), and the seat back frame 16 (seat back 15) is urged to rotate clockwise around the reclining mechanism 20 in the drawing.
The seat back 15 is rotatable around the reclining mechanism 20 so that it can be tilted forward and overlapped with the seat cushion 11 (see FIG. 3 (A) described later).

In the present embodiment, when the seat back 15 is tilted forward and superposed on the seat cushion 11, the seat 10 does not rotate from that state (that is, swings up and down in that state). A lock mechanism 30 is provided for locking and fixing the position of the seat back 15 (so as not to prevent it).
In the following, the case where the lock mechanism 30 is provided inside the seat cushion frame 12 and the seat back frame 16 will be described, but the lock mechanism 30 may be provided outside them. It is also possible to configure the lock mechanism 30 to be provided in the portion of the reclining mechanism 20 (that is, the reclining mechanism 20 is configured to also serve as the function of the locking mechanism).

In the present embodiment, the lock mechanism 30 includes an engaging portion and an engaged portion, and the engaging portion engages with the engaged portion in a state where the seat back 15 is tilted forward and overlapped with the seat cushion 11. By doing so, the seat back 15 is locked and the position is fixed so as not to rotate from that state.

Hereinafter, a specific configuration example of the lock mechanism 30 will be described with reference to FIG.
In the following, the engaging portion (convex member 33 described later) is fixed to the seat cushion frame 12, and the engaged portion (notch 32 of the disk 31 described later) is provided on the seat back frame 16. Although the case will be described, the engaging portion may be provided on the seat back frame 16 and the engaged portion may be provided on the seat cushion frame 12.

In the configuration example of FIG. 2, the disk 31 is attached to the connecting rotating shaft 21 or the seat back frame 16 that connects the seat cushion frame 12 and the seat back frame 16, and the seat back frame is attached to the seat cushion frame 12. When 16 rotates, the disk 31 rotates accordingly.
A notch 32 is provided in a part of the peripheral edge of the disk 31, and the notch 32 is used as an engaged portion of the lock mechanism 30 (hereinafter, referred to as an engaged portion 32).

Further, a case 34 for accommodating the upward convex member 33 is attached to the seat cushion frame 12. The convex member 33 is urged upward by a spring (not shown) built in the case 34, and the upper end of the convex member 33 is formed on a side surface portion other than the notch 32 (engaged portion 32) of the disk 31. The portion is pressed against the side surface portion of the disk 31 by the urging force of the spring.
In this configuration example, the convex member 33 corresponds to the engaging portion (hereinafter, referred to as the engaging portion 33).

In this state, when the seat back frame 16 rotates with respect to the seat cushion frame 12, the engaging portion 33 (convex member 33) is pressed against the side surface portion of the disk 31 that rotates in accordance with the rotation. It slides on the side surface.
Although not shown, the upper end of the engaging portion 33 is configured to rotate by attaching a rotating member to the upper end of the engaging portion 33 (convex member 33), and the disk is as described above. Instead of configuring the side surface portion of 31 and the engaging portion 33 to slide, it is also possible to configure the upper end portion of the engaging portion 33 to rotate in accordance with the rotation of the disk 31.

Then, as shown in FIGS. 3A and 3B, the seat back 15 (seat back frame 16) is rotated to a position where the seat back 15 (seat back frame 16) falls forward with respect to the seat cushion 11 (seat cushion frame 12) by an occupant or the like. Then, the engaged portion 32 (the notch 32 of the disk 31) moves to a position directly above the engaging portion 33 (convex member 33).
Then, the engaging portion 33 (convex member 33) moves upward due to the urging force of the spring in the case 34 and fits into the engaged portion 32 (the notch 32 of the disk 31).

In the configuration example of the lock mechanism 30, the engaging portion 33 (convex member 33) is engaged with the engaged portion 32 (disk) in a state where the seat back 15 is tilted forward and overlapped with the seat cushion 11 in this way. It is designed to engage with the notch 32) of 31.
Conversely, the engaged portion 32, that is, the engaged portion 32, is in a position where the engaging portion 33 engages with the engaged portion 32 when the seat back 15 is rotated to a position where the seat back 15 tilts forward with respect to the seat cushion 11. A notch 32 of the disk 31 is provided.

Then, when the engaging portion 33 engages with the engaged portion 32 in this way, the seat back frame 16 cannot rotate with respect to the seat cushion frame 12.
Therefore, according to the configuration example of the lock mechanism 30, the seat back 15 is locked and fixed in position so as not to rotate from the state where the seat back 15 is superposed on the seat cushion 11 (see FIG. 3A). It has become.

The lock mechanism 30 is not limited to the above configuration example, and the seat back 15 is prevented from rotating from that state and standing up when the seat back 15 is tilted forward and superposed on the seat cushion 11. Any mechanism can be adopted as long as the back 15 can be locked and the position can be fixed.

On the other hand, as shown in FIG. 3A and the like, when the seat back 15 is tilted forward and locked by the lock mechanism 30, the back surface 15a of the seat back 15 is not horizontal (slightly tilted). Since the load placed on the back surface 15a of the seat back 15 is tilted, it may be preferable that the back surface 15a of the seat back 15 tilted forward is substantially horizontal.

Therefore, in the present embodiment, the seat 10 is configured such that the back surface 15a is substantially horizontal while the seat back 15 is tilted forward and locked by the lock mechanism 30.
As described above, if the back surface 15a of the seat back 15 that is tilted forward and locked is substantially horizontal, there is an advantage that the luggage placed on the back surface 15a of the seat back 15 does not tilt.

One of the causes of the back surface 15a of the seat back 15 tilting when the seat back 15 is tilted forward is that the front side portion of the seat cushion 11 is raised upward as shown in FIG. 3A and the like. Can be mentioned.
Therefore, in the present embodiment, as shown in FIG. 4A, an elastic member 40 that can be expanded and contracted in the vertical direction is arranged on the front side portion inside the seat cushion 11.

In this case, the telescopic member 40 can be composed of the spring 40A.
Then, for example, as shown in FIG. 4A, a cavity is provided in the front portion inside the seat cushion 11, and the plate-shaped members 41A and 41B are arranged on the upper side (ceiling portion) and the lower side (bottom portion) of the cavity, respectively. .. Then, the expansion / contraction member 40 is arranged so as to be interposed between the upper and lower plate-shaped members 41A and 41B.

Then, as shown in FIG. 4A, when the seat back 15 is not locked by the lock mechanism 30, the telescopic member 40 is in an extended state, and the front side portion of the seat cushion 11 is maintained in a raised state. Will be done.
However, as shown in FIG. 4B, when the seat back 15 tilted forward is locked by the lock mechanism 30, the telescopic member 40 is in a contracted state.

Therefore, with this configuration, even when the front side portion of the seat cushion 11 is raised upward as shown in FIG. 1 and the like, the seat back 15 is tilted forward and locked by the lock mechanism 30. The elastic member 40 contracts to suppress the swelling of the front portion of the seat cushion 11.
Therefore, as shown in FIG. 4B, it is possible to realize a state in which the back surface 15a is substantially horizontal while the seat back 15 is tilted forward and locked by the lock mechanism 30.

As described above, according to the seat 10 (seat 10 for vehicles) according to the present embodiment, when the seat back 15 is tilted forward and overlapped with the seat cushion 11, the lock mechanism 30 works and the seat back 15 is seat cushioned. The seat back 15 is locked and fixed in position so as not to rotate from the state of being overlapped with 11.
Therefore, when the seat back 15 is tilted forward, it is possible to prevent the seat back 15 tilted forward from swinging up and down on the seat cushion 11.

Therefore, even when the seat cushion 11 and the seat back 15 are formed to be soft and highly flexible as in the case of a sedan seat, the seat back 15 tilted forward by the lock mechanism 30 is a seat. Swinging up and down on the cushion 11 is accurately suppressed.
Therefore, for example, even if the luggage is placed on the back surface 15a (see FIG. 3A) of the seat back 15 that has been tilted forward, it may be difficult to load the luggage or the loaded luggage may become unstable. It can be suppressed. Further, for example, even when a person sleeps on the back surface 15a of the seat back 15, the sleeping posture is stable and it is possible to suppress giving discomfort.

Further, in the seat 10 (vehicle seat 10) according to the present embodiment, the back surface (upper surface) of the seat back 15 that is tilted forward and locked is substantially horizontal, so that, for example, the luggage placed on the seat 10 tilts. It disappears and it becomes possible to load luggage in a stable state.

In the present embodiment, as shown in FIG. 1, the seat 10 is attached to the floor F, the seat cushion 11 does not move with respect to the floor F, and only the seat back 15 is tilted forward to tilt the seat cushion 11 forward. Although the case where the seat 10 is configured to be superposed on the seat 10 (that is, the seat 10 is a falldown type) has been described, it can also be applied to the dive-down type seat 10 described in Patent Document 1 described above.
This point is the same in the following modified examples and the like.

The present invention exerts its beneficial effects regardless of whether the seat 10 is falldown or dive down, and the seat back 15 is tilted forward to cause falldown or dive down. In this case, it is possible to appropriately prevent the seat back 15 tilted forward from swinging up and down on the seat cushion 11.

On the other hand, when the seat back 15 is erected from the state where the seat back 15 is superposed on the upper surface of the seat cushion 11 (see FIGS. 3A, 3B, etc.), the engaging portion 33 (convex member 33) is used. It is necessary to disengage the engaged portion 32 (the notch 32 of the disk 31).
Therefore, the present embodiment has the following mechanism for disengaging.

That is, as shown in FIG. 5, a lever 23 is provided on the back surface 15a side of the seat back 15, and the lever 23 is engaged with the engaging portion 33 (convex member) via the wire 24 inserted into the seat back 15. 33) is connected (see FIG. 2).
In the present embodiment, the wire 24 is formed of a control wire in which the inner wire 24a is inserted into the outer wire 24b, and when the occupant or the like operates the lever 23 on the back surface 15a of the seat back 15 in a state of being tilted forward. , The inner wire 24a moves in the outer wire 24b, and the engaging portion 33 (convex member 33) moves downward.

Therefore, in the present embodiment, when the lever 23 is operated, the engagement between the engaging portion 33 and the engaged portion 32 is released via the wire 24.
When the engagement between the engaging portion 33 and the engaged portion 32 is released, the seat back 15 can swing with respect to the seat cushion 11, so that the occupant or the like can easily raise the seat back 15. You can stand up. When the engagement between the engaging portion 33 and the engaged portion 32 is released, the seat back 15 is affected by the force of the winding spring of the reclining mechanism 20 or the winding spring (not shown) provided in the lock mechanism 30. It can also be configured to stand up automatically.

Further, instead of operating the lever 23 to disengage the engaging portion 33 and the engaged portion 32, for example, the back surface 15a is locked as shown in FIG. 4 (B). It is also possible to configure the seat back 15 in a substantially horizontal state so that the lock is released (the engagement between the engaging portion 33 and the engaged portion 32 is released) by pushing the seat back 15 further downward. ..
As described above, the mechanism for releasing the lock is not limited to the case where the lever 23 or the wire 24 is used.

[Modification example]
Next, a modified example of the seat 10 (vehicle seat 10) according to the present invention will be described.
For example, instead of providing the telescopic member 40 on the seat cushion 11 as described above, the telescopic member 40 that can be expanded and contracted in the vertical direction is arranged on the front side portion inside the seat back 15 in a state of being tilted forward. It is also possible.
In this case, for example, as shown in FIG. 6A, a cavity is provided in the front portion inside the seat back 15 in a state of being tilted forward, and plates are provided on the lower side (bottom portion) and the upper side (ceiling portion) of the cavity, respectively. The shaped members 42A and 42B are arranged. Then, the expansion / contraction member 40 is arranged so as to be interposed between the upper and lower plate-shaped members 42A and 42B.

Then, as shown in FIG. 6A, when the seat back 15 is not locked by the lock mechanism 30, the telescopic member 40 is in an extended state, and the front side portion of the seat cushion 11 in a state of being tilted forward. The shape is maintained.
However, as shown in FIG. 6B, when the seat back 15 tilted forward is locked by the lock mechanism 30, the telescopic member 40 is in a contracted state.

Therefore, with this configuration, even when the front side portion of the seat cushion 11 is raised upward as shown in FIG. 1 and the like, the seat back 15 is tilted forward and locked by the lock mechanism 30. The elastic member 40 contracts, and the front portion of the seat back 15 in the tilted state is deformed so as to correspond to the raised portion of the front portion of the seat cushion 11.
Therefore, as shown in FIG. 6B, it is possible to realize a state in which the back surface 15a is substantially horizontal while the seat back 15 is tilted forward and locked by the lock mechanism 30.

In addition, in FIG. 4A, FIG. 4B, FIG. It is also possible to configure in.
Further, for example, the contraction rate of the stretchable member 40 (in this case, the elastic modulus of the spring 40A) can be adjusted by changing the number of springs 40A that function as the stretchable member 40 among the plurality of springs 40A. It is also possible to configure in. If the contraction rate of the telescopic member 40 is adjustable in this way, the contraction rate of the telescopic member 40 can be changed according to the preference of the occupant, and the seat 10 can be made comfortable for the occupant. It will be possible.

By the way, the same applies to the seat back 15 shown in FIGS. 6 (A) and 6 (B), but when the seat cushion 11 shown in FIGS. 4 (A) and 4 (B) is viewed from above, FIG. As shown in (A) and (B), the plate-shaped members 41A and 41B are arranged so as to spread to the left and right on the front side portion inside the seat cushion 11, and are singular between the upper and lower plate-shaped members 41A and 41B (FIG. 7 (A)) or a plurality of (see FIG. 7 (B)) telescopic members 40 are arranged. Three or more telescopic members 40 may be arranged.
The member represented by the reference numeral 12A in each of the views of the seat cushions 11 shown in FIGS. 7 (A) and 7 (B) and below as viewed from above represents an S spring provided on the seat cushion frame 12. Further, in FIGS. 7A and 7B, the case where the telescopic member 40 is arranged above the S spring 12A (that is, where the S spring 12A is below) is shown, but the telescopic member 40 is , It may be arranged in a place other than the upper side of the S spring 12A (that is, a place where there is no S spring 12A below).

On the other hand, as shown in FIG. 8A, the plate-shaped members 41A and 41B can be configured to be divided into left and right. Further, as shown in FIG. 8B, it can be divided into three or more. An expansion / contraction member 40 is arranged in each of the divided plate-shaped members 41A and 41B, and the divided plate-shaped members 41A and 41B and each expansion / contraction member 40 are independently (that is, other divided plate-like members). It moves (independently of members 41A, 41B, etc.).
With this configuration, even if there are individual differences in the occupant's body, the divided plate-shaped members 41A and 41B move independently, so it is possible to create a sitting comfort that suits the occupant's preference. Will be.

In the above case, it is also possible to adjust the contraction rate (for example, the elastic modulus of the spring 40A) of each expansion / contraction member 40 to a different contraction rate.
It is also possible to divide both the plate-shaped members 41A and 41B, but for example, the plate-shaped member 41B farther from the body of the occupant seated on the seat 10 is not divided and is closer to the body of the seated occupant. It is also possible to configure so that only one plate-shaped member 41A is divided.
Further, as shown in FIGS. 6A and 6B, when the plate-shaped members 42A and 42B are arranged on the seat back 15 side, the same configuration can be made as described above.

Further, for example, when the seat back 15 is tilted backward to perform the reclining operation while the occupant (not shown) is seated on the seat 10 shown in FIG. 1, the occupant's body moves with respect to the seat back 15 as the seat back 15 tilts backward. In some cases, the occupant may not be able to take a relaxed posture due to the relative lowering.
Therefore, for example, in the seats 10 shown in FIGS. 4 (A) and 4 (B), when the seat back 15 tilts backward and reclines, the elastic member 40 expands and the front portion of the seat cushion 11 rises upward. It is possible to configure in.

Specifically, for example, in the sheet 10 shown in FIG. 4 (A) (that is, the sheet 10 in a state where the lock mechanism 30 is not locked), the upper plate-shaped member 41A is urged upward by the telescopic member 40. To be in a state to do.
Then, as shown in FIGS. 9A and 9B, when the seat back 15 is not tilted backward, the upper plate-shaped member 41A is caught by the stopper 43 and urged by the telescopic member 40. The stopper 43 is arranged so that the upper plate-shaped member 41A does not move upward. At least the upper side of the stopper 43 is bent so as to be hooked on the plate-shaped member 41A from the upper side.

As shown in FIG. 9B, the stopper 43 may be arranged not only on either the left or right side of the plate-shaped members 41A and 41B but also on both sides.
Further, for example, a plurality of stoppers 43 may be arranged in the front-rear direction.

Then, when the seat back 15 is tilted backward and the reclining operation is performed, as shown in FIG. 10, the stopper 43 moves rearward in accordance with the operation. Therefore, the upward movement of the upper plate-shaped member 41A is not hindered, so that the telescopic member 40 extends and the upper plate-shaped member 41A moves upward.
For example, with this configuration, when the seat back 15 tilts backward and reclines, the telescopic member 40 expands and the upper plate-shaped member 41A moves upward, so that the front portion of the seat cushion 11 moves upward. It gets excited.

As described above, when the seat back 15 is tilted backward to perform the reclining operation while the occupant (not shown) is seated on the seat 10, the front side portion of the seat cushion 11 rises upward.
Therefore, even if the seat back 15 falls backward, the occupant's body is prevented from being lowered relative to the seat back 15, and the occupant can take a relaxed posture.

By the way, in the above, the case where the telescopic member 40 is composed of the spring 40A has been described, but as the telescopic member 40, the air cell 40B is used instead of the spring 40A, for example, as shown in FIGS. 11A and 11B. It is also possible to configure it as follows.
The air cell 40B is a bag body that expands when a fluid (here, air, but may be a liquid) is enclosed inside.

Then, the expansion and contraction of the expansion / contraction member 40 can be realized by expanding and contracting the air cell 40B.
When the air cell 40B is used as the telescopic member 40, as shown in FIG. 12A, it is possible to arrange only one air cell 40B from the vicinity of the right end to the vicinity of the left end of the seat cushion 11. , As shown in FIG. 12B, it is also possible to arrange a plurality of them.

As described above, the case where the air cell 40B is used as the telescopic member 40 is exactly the same as the case where the spring 40A is used as the telescopic member 40 described above (see FIGS. 4 (A), (B) and 6 (A) to 10). It is possible to function as the telescopic member 40, and it is possible to exert a beneficial effect that is exactly the same as when the spring 40A is used as the telescopic member 40.

When the air cell 40B is used as the telescopic member 40, it can be configured so that the expansion and contraction of the air cell 40B is mechanically performed by an air compressor or the like.
Further, for example, when the plate-shaped member 41A (and the plate-shaped member 41B) is configured to be divided into left and right as shown in FIG. 8A, each divided portion is divided as shown in FIG. If the air cells 40B as the telescopic members 40 are arranged in each of the above and they are connected by a pipe 44A or the like so that air can flow between them, for example, the occupant seated on the seat cushion 11 is on the right or By applying weight to the left, air naturally circulates from one air cell 40B to the other air cell 40B, so that the seating comfort can be adjusted to the occupant's preference.

Further, for example, as shown in FIG. 14, the air cell 40B as the telescopic member 40 is arranged inside the seat cushion 11, and the air cell 45 is also arranged inside the seat back 15. If the air cell 40B and the air cell 45 are connected by a pipe 44B or the like so that air can flow between them, the seat back 15 is tilted backward to perform a reclining operation, which is not shown. The weight of the occupant's upper body is applied to the air cell 45 of the seat back 15.

Therefore, since air moves from the air cell 45 of the seat back 15 to the air cell 40B of the seat cushion 11 via the pipe 44B or the like, the air cell 40B swells (that is, the expansion / contraction member 40 extends), and the front side portion of the seat cushion 11 Rise upwards. Therefore, when the seat back 15 is tilted backward to perform the reclining operation while the occupant (not shown) is seated on the seat 10, the front side portion of the seat cushion 11 rises upward.
In this way, even if the air in the air cell 40B is not mechanically taken in and out by an air compressor or the like (that is, even if an air compressor or the like is not provided), the air cell 40B can be expanded by devising the structure of the air cell 40B or the like. Can be contracted or contracted.

Although FIG. 14 shows a case where the pipe 44B is arranged so as to pass through the inside of the seat cushion 11 and the seat back 15, for example, as shown in FIG. 15, a part of the pipe 44B is a part of the seat cushion 11 and the seat. It is also possible to arrange it so as to come out of the back 15.

Further, it is also possible to configure the spring 40A and the air cell 40B to be used together as the expansion / contraction member 40.
The same applies to the cases shown in FIGS. 6A and 6B, but when the spring 40A is arranged in the front portion inside the seat cushion 11 as shown in FIGS. 4A and 4B, for example. , As shown in FIG. 16A, the spring 40A can be configured to be arranged in the air cell 40B. In this case, the expansion / contraction member 40 is formed by the spring 40A and the air cell 40B.

When the spring 40A and the air cell 40B are used together as the telescopic member 40, the seat cushion 11 is in a state as shown in FIGS. 17A and 17B when viewed from above.
Further, in this case, the air compressor or the like is not attached to the air cell 40B (the air compressor or the like can be attached), and the air in the air cell 40B is discharged to the outside on the side surface or the like of the air cell 40B. A vent (not shown) is provided for taking in outside air into the air cell 40B.

In this way, even when the spring 40A and the air cell 40B are used together as the telescopic member 40, when the spring 40A is used as the telescopic member 40 described above (FIGS. 4 (A), (B) and 6 (A) to 10). It is possible to function as the telescopic member 40 in exactly the same manner as when the air cell 40B is used (see FIGS. 11A to 15), and the benefits are exactly the same as when the spring 40A is used as the telescopic member 40. It is possible to exert various effects.

Further, in this configuration, when the seat back 15 is tilted forward and locked by the lock mechanism 30 (see FIG. 16B), the spring 40A is compressed and the air in the air cell 40B is pushed out. The air cell 40B contracts.
When the seat back 15 is unlocked (see FIG. 16A), the spring 40A extends to push up the upper side of the plate-shaped member 41A and the air cell 40B. Therefore, since the outside air is taken into the air cell 40B, the air cell 40B can be expanded.

As described above, also in this case, the air cell 40B can be expanded or contracted without mechanically moving the air in the air cell 40B in and out by an air compressor or the like (that is, without providing an air compressor or the like). It will be possible.

On the other hand, for example, when a vehicle collides, if the waist and buttocks of the occupant seated on the seat 10 shift forward, the seat belt may be caught on the occupant's neck. Airbags may be provided.
Therefore, when the telescopic member 40 is configured by using the airbag 40B as shown in FIGS. 11 (A) and 11 (B) (the telescopic member 40 as shown in FIGS. 16 (A) and 16 (B)). Including the case where the air cell 40B and the spring 40A are used in combination), for example, as shown in FIGS. 18A and 18B, it is possible to configure the airbag 46 to be arranged inside the air cell 40B. Is.

At that time, for example, a fragile portion is provided in the central portion in the left-right direction of the upper portion of the air cell 40B, and when the airbag 46 is inflated, the air cell 40B is torn from the fragile portion, and the airbag 46 is the seat cushion 11. It is configured to break through the upper surface and project upward.
With this configuration, the telescopic member 40 including the air cell 40B and the airbag 46 can be arranged together on the front side portion inside the seat cushion 11, and the telescopic member 40 and the airbag 46 can be appropriately arranged. It becomes possible to operate.

Further, instead of arranging the airbag 46 inside the air cell 40B as described above, for example, as shown in FIGS. 19A and 19B, the inflator 47 is arranged inside the air cell 40B. Is possible.
In this case, for example, as shown in FIG. 19B, if the inflator 47 is arranged in the central portion inside the air cell 40B and the central portion of the upper portion of the air cell 40B is configured to inflate when a strong pressure is applied, When the inflator 47 explodes, the central portion of the upper portion of the air cell 40B swells upward, breaks through the upper surface of the seat cushion 11, and protrudes upward.
Therefore, with such a configuration, the air cell 40B can be used as an airbag, and the air cell 40B arranged on the front side portion inside the seat cushion 11 can be appropriately operated as the telescopic member 40 and the airbag, respectively. Is possible.

Needless to say, the present invention is not limited to the above-described embodiments and modifications, and can be appropriately modified as long as the gist of the present invention is not deviated.

10 seats (vehicle seats)
11 Seat cushion 12 Seat cushion frame 13 Cushion pad 14 Skin 15 Seat back 15a Back 16 Seat back frame 17 Cushion pad 18 Skin 23 Lever 24 Wire 30 Lock mechanism 32 Notch (engaged part)
33 Convex member (engagement part)
40 Telescopic member 40B Air cell 41A, 41B, 42A, 42B Plate-shaped member 46 Airbag 47 Inflator F floor

Claims (12)

In vehicle seats with seat cushions and seat backs
The seat back can be tilted forward and overlapped with the seat cushion.
A lock mechanism for locking and fixing the position of the seat back so that the seat back does not rotate from the state of being overlapped with the seat cushion is provided.
When the seat back that has fallen forward is locked by the lock mechanism, the seat cushion or the seat back is in a contracted state, and the back surface of the seat back that has fallen forward is configured to be substantially horizontal. A vehicle seat characterized by being present. The locking mechanism includes an engaging portion and an engaged portion, and the locking mechanism includes an engaging portion and an engaged portion.
The seat back is locked and fixed in position by engaging the engaged portion with the engaged portion in a state where the seat back is tilted forward and overlapped with the seat cushion. The vehicle seat according to claim 1. A lever is provided on the back side of the seat back.
The lever is connected to the engaging portion via a wire inserted into the seat back.
The vehicle seat according to claim 2, wherein when the lever is operated, the engagement between the engaging portion and the engaged portion is released via the wire. Any of claims 1 to 3, wherein the seat cushion does not move with respect to the floor, and only the seat back is tilted forward so that the seat cushion can be overlapped with the seat cushion. The vehicle seat described in item 1. An elastic member that can expand and contract in the vertical direction is arranged on the front side portion inside the seat cushion.
The telescopic member
When the seat back that has fallen forward is locked by the lock mechanism, it is in a contracted state.
The vehicle seat according to any one of claims 1 to 4, wherein the seat back is in an extended state when it is not locked by the locking mechanism. The vehicle seat according to claim 5, wherein when the seat back falls backward, the elastic member is extended and the front side portion of the seat cushion is configured to rise upward. An elastic member that can be expanded and contracted in the vertical direction is arranged on the front side portion inside the seat back in a state of being tilted forward.
The telescopic member
When the seat back that has fallen forward is locked by the lock mechanism, it is in a contracted state.
The vehicle seat according to any one of claims 1 to 4, wherein the seat back is in an extended state when it is not locked by the locking mechanism. The vehicle seat according to any one of claims 5 to 7, wherein the telescopic member is configured so that its shrinkage rate can be adjusted. Plate-shaped members are arranged at both ends of the telescopic member, and both or at least one of the plate-shaped members is divided into left and right.
The vehicle seat according to any one of claims 5 to 8, wherein the telescopic member is arranged on each of the divided plate-shaped members. The telescopic member is configured by using an air cell.
The vehicle seat according to any one of claims 1 to 9, wherein an airbag is arranged in the air cell. The telescopic member is configured by using an air cell.
The vehicle seat according to any one of claims 1 to 9, wherein an inflator is arranged in the air cell. A seat cushion composed of a seat cushion frame, a cushion pad provided on the seat cushion frame, and a skin covering the seat cushion frame and the cushion pad to form a seat surface.
A seat back composed of a seat back frame, a cushion pad provided on the seat back frame, and a skin covering the seat back frame and the cushion pad to form a seat surface.
In a vehicle seat equipped with
The seat back can be tilted forward and overlapped with the seat cushion.
A lock mechanism for locking and fixing the position of the seat back so that the seat back does not rotate from the state of being overlapped with the seat cushion is provided.
When the seat back that has fallen forward is locked by the lock mechanism, the seat cushion or the seat back is in a contracted state, and the back surface of the seat back that has fallen forward is configured to be substantially horizontal. A vehicle seat characterized by being present.

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