JP2000025498A - Automobile seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automobile seat having both a leg support function, a center folding function and a fully flattening function and capable of improving amenity further. SOLUTION: This automobile seat 10 is composed of a seat cushion 12 and a seat back 14 tiltable to the seat cushion 12, and the seat back 14 is composed of a seat back upper 16 and a seat back lower 18. A stay 22 is projected from the lower end of the seat back upper 16, a holder 24 detachably engaging with the stay 22 is respectively set in the upper end part of the seat back lower 18 and the front end part of the seat cushion 12, and the seat back upper 16 is respectively detachably connected to the seat back lower 18 and the seat cushion 12. The seat back upper 16 is respectively connected to the seat back lower 18 and the seat cushion 12 so as to be tiltable with a shaft turning in the seat width direction as the center.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of improving comfort.

[0002]

2. Description of the Related Art Conventionally, as a vehicle seat of this type, for example, a leg support structure described in Japanese Utility Model Laid-Open Publication No. Sho 62-167740, and a new vehicle manual "NISSAN Leppard J. Ferry" (1992) Described above.

[0003]

In the vehicle seat having the leg supporting structure described in the above publication, a cushion for supporting the leg is stored in the seat back, and the cushion is taken out from the seat back when necessary. It has become. Further, in a conventional automobile seat having a folded structure, the seat back is divided into upper and lower portions, and the upper portion of the seat back can be tilted with respect to the lower portion of the seat back. Then, the occupant can appropriately tilt the upper portion of the seat back to adjust the seating posture according to preference.

However, none of the conventional automobile seats has both the leg supporting function and the center bending function.
Yet another issue is that with conventional automotive seats,
Since the space in the vehicle cabin is narrow and the space between the seat and the rear seat is small, the seat back cannot be tilted rearward to be fully flat with the rear seat. From the above, the conventional automobile seats could not be said to have sufficient comfort.

The present invention has been made in view of such problems, and the inventions according to claims 1 to 4 have a leg supporting function, a center folding function, and a function of full flattening, and can further improve comfort. It is an object of the present invention to provide an automobile seat.

[0006]

According to one aspect of the present invention, there is provided an automobile having a seat cushion and a seat back tiltable with respect to the seat cushion. The seat back is composed of a seat back upper and a seat back lower, and a stay protrudes from the lower end of the seat back upper. The stay can be detachably attached to the upper end of the seat back lower and the front end of the seat cushion. The seatback upper is detachably attached to the seatback lower and the seat cushion, respectively, and the seatback upper is oriented in the seat width direction with respect to the seatback lower and the seat cushion, respectively. Are connected so as to be tiltable about the center.

When the stay of the seat back upper is engaged with a holder set at the upper end of the seat back lower, the seat back becomes a normal seat back. By tilting the seat back upper with respect to the seat back lower, the seat back upper is lowered. Can be folded inside. Also, remove the seat back upper stay from the seat back lower holder,
By engaging with a holder set at the front end of the seat cushion, the seat back upper serves as a leg support, and the leg support position can be adjusted by tilting the seat back upper with respect to the seat cushion.

When the seat back lower is tilted rearward with respect to the seat cushion in a state where the seat back upper is attached to the seat cushion, the seat back becomes full flat. According to a second aspect of the present invention, in the first aspect, an engagement position between the stay and the holder is adjustable along an axial direction of the stay.

According to a third aspect of the present invention, in the first or second aspect, the seat back upper has a seat back upper frame therein and a base to which the stay is fixed. The seatback upper frame and the base are connected via a ratchet, and the seatback upper frame tilts with respect to the base in a stepwise manner only in a certain direction around an axis facing the seat width direction from the reference position. A lock release mechanism is provided, in which the ratchet is disengaged at the position where the seat back upper frame is inclined at the maximum and the seat back upper frame is returned to the original reference position, and the base and the ratchet are coupled again via the ratchet. It is characterized by the following.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the seat back upper has a seat back upper frame therein and a base to which the stay is fixed. The seat back upper frame and the base are connected via a worm gear and a gear, and the rotation of the worm pivotally supported by the seat back upper frame is transmitted to the worm wheel and the gear, and the seat back upper frame is moved relative to the base. And an operation unit for performing a worm rotation operation is provided outside the seatback upper.

[0011]

According to the first aspect of the present invention, the seat back upper is tilted with respect to the seat back lower to provide a function of bending the seat back in the middle.
The seat back upper is attached to the seat cushion to provide leg support function.Furthermore, from the state where the seat back upper is attached to the seat cushion, the seat back lower is tilted backward with respect to the seat cushion. Full flat function can be provided. Even in the case where the space in the vehicle cabin is narrow and the gap between the seat and the rear seat is small, it is sufficient if there is a gap that allows only the seat back lower to be tilted rearward, so that the seat can be fully flattened together with the rear seat.

As described above, a vehicle seat having three functions can be provided, and the occupant can select the above functions according to his / her preference. Thereby, it is possible to realize a vehicle seat with further improved comfort. According to the second aspect of the invention, in addition to the effect of the first aspect, since the engagement position can be adjusted along the axial direction of the stay, the seat can be adjusted according to the physique and preference of the occupant. The vertical position of the back upper can be adjusted with respect to the seat back lower, and similarly, the front and rear position of the seat back upper can be adjusted with respect to the seat cushion, so that comfort can be further improved.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, when the seat back upper is tilted in a certain direction with respect to the seat back lower or the seat cushion, the frame and the base are provided. Is connected via a ratchet, so that the seat back upper can be held in a state of being inclined with respect to the seat back lower or the seat cushion in a stepwise manner, and can be easily adjusted to a position desired by the occupant. be able to.

According to the fourth aspect of the invention, in addition to the effect of the first or second aspect, the seatback upper is tilted with respect to the seatback lower or the seat cushion by operating the operation unit. It is possible,
It can be easily adjusted to the occupant's preferred position.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view illustrating a first embodiment of an automobile seat according to the present invention. In FIG. 1, reference numeral 10 denotes an automobile seat, which includes a seat cushion 12 and a seat back 14. Seat back 14
Can be tilted with respect to the seat cushion 12 by a known reclining mechanism 21. Further, the seat back 14 includes an upper seat back upper 16 and
A headrest 20 is mounted above the seatback upper 16.

A stay 22 projects downward from the lower end of the seat back upper 16.
At an upper end of the holder 8, a holder 24 detachably engaged with the stay 22 is set. The seat back upper 16 and the seat back lower 18 are connected to the stay 22 and the holder 2.
4 so as to be detachably connected. Further, since the stay 22 can adjust the engagement position with respect to the holder 24 along the axial direction, the upper and lower positions of the seat back upper 16 with respect to the seat back lower 18 can be adjusted.

FIG. 2 is an enlarged perspective view of the stay 22 and the holder 24. The stay 22 is formed with a stay groove 22a which is cut in a sawtooth shape at predetermined intervals along the axial direction. One holder 24 has a cylindrical body 26 formed with a central hole 26a for receiving the stay 22, and a through hole 28a inside the cylindrical body 26 that matches the central hole 26a and traverses the central hole 26a. The slider 28 includes a slider 28 that can slide in the direction in which the slider 28 moves, and can bite into the stay groove 22a, and a spring 29 that is an elastic body that urges the slider 28 in a direction that bites into the stay groove 22a. Further, the slider 28 has an operation protrusion 28 b protruding outside the holder 24 on the side opposite to the spring 29.

When the stay 22 is inserted into the center hole 26a of the cylindrical body 26, the through hole 28a of the slider 28 is
a, and the stay 22 can be inserted deep into the cylindrical body 26. Stay groove 22a is slider 2
When the slider comes to the position 8, the slider 28 bites into the stay groove 22a by the elastic force of the spring 29, and the stay 22 is locked. When the slider 28 is pushed into the holder 24 against the elastic force of the spring 29 by pressing the operation protrusion 28b,
The slider 28 slides in the direction opposite to the direction in which it bites from the stay groove 22a, and the lock of the stay 22 is released, so that the stay 22 can be pushed further inward. When the next stay groove 22a reaches the position of the slider 28, the slider 28 bites into the stay groove 22a again. Thus,
Each time each stay groove 22a comes to the slider 28, the stay 22 engages with the holder 24. On the other hand, when the stay 22 is to be removed, when the slider 28 is pushed upward, the slider 28 slides on the saw-toothed inclined surface of the stay groove 22a. 22 can be disengaged from the holder 24.

A stay 22 is similarly protruded from the lower end of the headrest 20. The stay 22 is detachably attached to a holder 24 set at the upper end of the seat back upper 16 so that the engagement position can be adjusted. Is engaged. Further, a holder 24 is also provided at the front end of the seat cushion 12, and the stay 2 of the seat back upper 16 is provided.
2 is detachably engageable so that the engagement position can be adjusted.

The main body of the seat back upper 16 is
It is tiltable with respect to the stay 22 protruding from the lower end. FIG. 3 shows the stay 22 and the seat back upper 16.
2 shows a perspective view of the inside of FIG. The seat back upper 16 has therein a seat back upper frame 30 for supporting pads of the seat back upper 16 and a base shaft 32 (base) to which the stay 22 is fixed. The seat back upper frame 30 is pivotally supported so as to be rotatable. As shown in FIG. 4, a side plate 34 is fixed inside the seat back upper frame 30. One end of the latch 40 is fixed to the side plate 34 by the pin 36, and a pin 41 protruding from the other end of the latch 40 is slidable in a slide groove 34 a formed in the side plate 34. I have. Further, a compression spring 42 is provided between the outer edge of the other end of the latch 40 and the side plate 34. The compression spring 42 has a fixed end 42 a on the latch 40 side and a fixed end 42 b on the seatback upper frame 30 side.
6, the clockwise moment about the pin 36 is applied to the latch 40 when it is below the line connecting it to the latch 40, and the counterclockwise moment is applied around the pin 36 when it is above the line.
And has a so-called turnover function. The latch 40 has a saw tooth 40a formed thereon, and a pawl 46 having a claw portion 46a meshing with the saw tooth 40a.
Are rotatably supported with respect to the side plate 34. The central axis of the pawl 46 is connected to the base shaft 32, and a pin 47 protruding from the pawl 46 can slide in a sliding groove 34 b formed in the side plate 34. A tension spring 48 is provided between the pawl 46 and the side plate 34.

As described above, the saw tooth 40a of the latch 40 is used.
The seat back upper frame 30 and the base shaft 32 are connected by a ratchet including a pawl 46 having a claw portion 46a that meshes with the seat back upper frame 30. In contrast, the ratchet can be tilted stepwise only forward by the engagement of the ratchet. Further, as described below, at a position where the seat back upper frame 30 is inclined forward to the maximum, the ratchet is disengaged and the seat back upper frame 30 is returned to the original reference position, and the seat back upper frame 30 is again connected to the base shaft 32 and the ratchet. A lock release mechanism is provided for coupling.

That is, the main body of the seat back upper 16 is
By tilting forward (indicated by an arrow F) with respect to the stay 22 from the reference position which is tilted backward at the maximum as shown in FIG. 4, one end is fixed to the side plate 34 of the seat back upper frame 30 and The latch 40 whose other end is slidable moves forward relative to the base shaft 32 fixed to the stay 22. At this time, the compression spring 42 generates a clockwise moment about the pin 36 with respect to the latch 40 in FIG. As a result, while the latch 40 is shifted one tooth at a time with respect to the pawl 46 fixed to the base shaft 32, the saw teeth 40a and the claw portions 46a are engaged with each other and locked together. In this manner, the state where the seat back upper frame 30 is inclined with respect to the base shaft 32 can be maintained step by step. As shown in FIG. 5, when the seat back upper frame 30 comes to the maximum forwardly inclined position, the lower protruding portion 40
5b is kicked by one end 46b of the pawl 46a of the pawl 46 and rotates to the upper left in FIG. At this time, the compression spring 42, which has generated a clockwise moment around the pin 36,
By generating a counterclockwise moment around 6, the latch 40 is held in this rotational position and the latch 40 and the pawl 46 are unlocked. This allows the latch 40
Is returned to the original position by the tension spring 48, and the other end 46c of the claw 46a is connected to the other end 4 of the latch 40 as shown in FIG.
0c in the opposite direction, the latch 40 is rotated, and the saw tooth 40a of the latch 40 and the pawl 4
6a can engage with each other. The above-described latch 40, pawl 46, and springs 42 and 48 constitute an unlocking mechanism.

The automobile seat 1 configured as described above
At normal times, the stay 22 of the seat back upper 16 is engaged with a holder 24 set at the upper end of the seat back lower 18 as shown in FIG. . Then, as shown in FIG.
For the stay 22, in other words, the seat back lower 1
By tilting the main body of the seat back upper 16 with respect to 8, the seat back 14 can be bent in the middle, and the engagement position between the stay 22 and the holder 24 is adjusted as shown in FIG. By doing so, the vertical position of the seat back upper 16 can be adjusted with respect to the seat back lower 18 according to the occupant's physique and preference.

As shown in FIG. 10, the stay 22 of the seat back upper 16 is connected to the holder 24 of the seat back lower 18.
The seat back upper 16 serves as a leg support when it is removed from the seat cushion 12 and engaged with the holder 24 set at the front end of the seat cushion 12. Then, as shown in FIG. 11, the leg supporting position can be adjusted by tilting the main body of the seat back upper 16 with respect to the stay 22, in other words, with respect to the seat cushion 12, as shown in FIG. As described above, by adjusting the engagement position between the stay 22 and the holder 24, the front-back position of the seat back upper with respect to the seat cushion 12 can be adjusted according to the occupant's physique and preference.

Further, as shown in FIG. 13, when the seat back upper 16 is attached to the seat cushion 12, the reclining mechanism 21 is actuated to lower the seat back lower 18 rearward with respect to the seat cushion 12. , Becomes full flat. Even in the case where the space in the vehicle cabin is narrow and the gap with the rear seat 11 is small, it is sufficient if there is a gap that only allows the seat back lower 18 to be tilted rearward, so that the rear seat 11 and the rear seat 11 are completely flattened. be able to.

As described above, a single seat can have all of the functions of folding in the center, the function of supporting legs, and the function of full flat. Can be further improved. The headrest 20 is also tilted and moved up and down with respect to the seatback upper 16 as appropriate,
The range of sheet layout options can be further expanded.

FIG. 14 is a perspective view showing another embodiment of the seat back upper for performing the center folding function. In this embodiment, the seat back upper 16 has therein a seat back upper frame 50 that supports pads of the seat back upper 16 and a base 52 to which the stay 22 is fixed. A fixed base shaft 53 is rotatably supported on the seatback upper frame 50.

On the outer side of the seat back upper 16, a rotary dial 54 as an operation unit is provided.
A worm 56 integrated with the rotary dial 54 extends inside the seat back upper 16 and is rotatably supported on the seat back upper frame 50. A worm wheel 58 meshes with the worm 56,
The worm wheel 58 is coaxially integrated with the bevel gear 60. Further, the bevel gear 60 meshes with the bevel gear 62,
Bevel gear 64 coaxially integrated with bevel gear 62 has bevel gear 6
The bevel gear 6 meshes with the bevel gear 66 and is coaxially integrated therewith.
8, a bevel gear 70 meshes with the bevel gear 70, and the bevel gear 70 is integrally fixed to the base shaft 53.

As described above, the worm gear and the gears 60, 62, 6 comprising the worm 56 and the worm wheel 58 are provided.
The seatback upper frame 50 and the base 52 are connected by 4, 66, 68, 70. When the operation dial 54 is rotated, the worm 56 is rotated, and the worm wheel 58 and the gears 60, 62, 64, 66, 68,
The rotation is transmitted in the order of 70, and the seat back upper frame 50 tilts with respect to the base 52.

The middle folding mechanism configured as described above can also have the same operation and effect as the first embodiment. By operating the rotary dial 54, the occupant can move to the desired position. The seat back upper 16 can be tilted with respect to the seat back lower 18 or the seat cushion 12.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a vehicle seat according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a stay and a holder.

FIG. 3 is a perspective view showing an internal structure of a seat back upper.

FIG. 4 is an internal view of the seat back upper frame taken along line 4-4 in FIG. 3, showing a state where the seat back upper frame is at a reference position.

5 is a diagram corresponding to FIG. 4, showing a state in which the seat back upper is inclined forward to the maximum.

6 is a diagram corresponding to FIG. 4, showing a state immediately before the seat back upper returns to the reference position in FIG. 4;

FIG. 7 is a side view of the vehicle seat, showing a normal state.

FIG. 8 is a side view of the vehicle seat, showing a folded state of the seat back.

FIG. 9 is a side view of the vehicle seat, showing a state where a vertical position of a seat back upper is adjusted.

FIG. 10 is a side view of the vehicle seat, showing a leg supporting state.

FIG. 11 is a side view of the vehicle seat, showing a state where a seat back upper is tilted.

FIG. 12 is a side view of the vehicle seat, showing a state in which the front and rear positions of a seat back upper are adjusted.

FIG. 13 is a side view of the vehicle seat, showing a fully flattened state.

FIG. 14 is a perspective view illustrating another embodiment of a seat back upper for performing a center folding function.

[Explanation of symbols]

 Reference Signs List 10 Automotive seat 12 Seat cushion 14 Seat back 16 Seat back upper 18 Seat back lower 22 Stay 24 Holder 30 Seat back upper frame 32 Base shaft (base) 40 Latch 40a Saw tooth 46 Paul 46a Claw 50 Seat back upper frame 52 Base 54 Rotary dial (operation unit) 56 Worm (worm gear) 58 Worm wheel (worm gear) 60 bevel gear (gear) 62 bevel gear (gear) 64 bevel gear (gear) 66 bevel gear (gear) 68 bevel gear (gear) 70 bevel gear (gear)

Claims (4)

[Claims] 1. An automobile seat comprising a seat cushion and a seat back tiltable with respect to the seat cushion, wherein the seat back comprises a seat back upper and a seat back lower, and a lower end of the seat back upper. A holder is provided at the upper end of the seat back lower and the front end of the seat cushion so as to be detachably engaged with the stay, and the seat back upper is attached to and detached from the seat back lower and the seat cushion, respectively. An automobile seat, wherein the seat back upper is capable of being tilted about an axis oriented in a seat width direction with respect to the seat back lower and the seat cushion, respectively. 2. The vehicle seat according to claim 1, wherein an engagement position between the stay and the holder is adjustable along an axial direction of the stay. 3. The seat back upper is provided inside thereof.
It has a seat back upper frame and a base to which the stay is fixed, and the seat back upper frame and the base are connected via a ratchet, and about an axis facing a seat width direction from a reference position. The seat back upper frame can be tilted with respect to the base stepwise only in a certain direction, and the ratchet is disengaged at the position where the seat back upper frame is tilted to the maximum to return the seat back upper frame to the original reference position. 3. The vehicle seat according to claim 1, further comprising a lock release mechanism that is returned and connected to the base again via the ratchet. 4. The seat back upper is provided therein.
A seat back upper frame, and a base to which the stay is fixed, wherein the seat back upper frame and the base are coupled via a worm gear and a gear, and a worm shaft supported by the seat back upper frame. The rotation is transmitted to the worm wheel and the gear, the seat back upper frame can be tilted with respect to the base, and an operation unit for rotating the worm is provided outside the seat back upper. 3. The vehicle seat according to 1 or 2.