JP2000085424A - Seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve stability and comfortableness by reducing hip dislocation and the bulge of clothes in the case of changing over to a reclining state from an upright state with simple structure. SOLUTION: A tiltable seat part frame 32 is almost horizontally installed on a base frame 8. The rear end of the seat part frame 32 is rotatably connected to a rotating shaft 39 of a back reclining frame 6. The lower end of the back reclining frame 6 is elevatingly supported by seat part angle adjusting mechanism 37. The back reclining frame 6 is inclined backward around the rotating shaft 39 as a rotating fulcrum and simultaneously moved downward by a seat lock 5. The seat part frame 32 is therefore rotated and inclined in such a way that the rear end side is lower than the front end side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat capable of switching between a normal state in which a seat back is substantially upright and a reclining state in which a seat back is inclined at a required angle.

[0002]

2. Description of the Related Art A reclining type vehicle seat installed in a passenger compartment of a railway vehicle, a bus, an aircraft, or the like includes a seatback in which only a backrest (seatback) is tilted backward, a seatback and a seat. It is most common to tilt the parts (seat cushions) in conjunction with each other.

FIGS. 5A and 5B show a conventional example of a reclining type seat in which only the seat back is tilted. FIG. 5A shows a normal state (upright) and FIG. 5B shows a state of reclining. In the figure, 1 is a vehicle seat, 2 is a seat cushion, 3 is a seat back, 4 is a vehicle cabin floor surface, 5 is a reclining drive device for tilting the seat back 3, 6 is a slewing frame, and 7 is a seat. The rotation fulcrum 8 of the back 3 is a base frame. The seat cushion 2 is fixed substantially horizontally to the base frame 8, and the backrest frame 6 is attached to the base frame 8 so as to be tiltable.

In such a seat 1, when the backrest frame 6 is tilted rearward by a required angle to be in a reclining state, the butt portion of the occupant H shifts to the front of the seat, causing a so-called butt-slip state. There was a problem.
As a result, there is a problem that the occupant H is burdened because the waist is not supported.

FIG. 6 is a view showing a conventional example of a reclining type seat in which a seat back and a seat cushion are tilted in conjunction with each other (Japanese Patent Laid-Open No. 7-257246). In this vehicle seat 10, a backrest frame of the seatback 3 is rotatably supported in a front-rear direction by a support shaft 11, arm brackets 12 and 13 are provided below the backrest frame, and a lower arm bracket is provided. 13 and a reclining cylinder 14 are connected. The support shaft 11 is provided on the base frame side. Further, the arm bracket 13 and the rear end of the seat cushion 2 are connected by a V-shaped link 15. Link 15
The bending portion is rotatably supported by a support shaft 16 provided on the base frame side, and is located below the support shaft 11.

[0006] The vehicle seat 10 having such a structure.
In this case, when the cylinder 14 is operated to move the piston rod 14a forward, the seat back 3
The vehicle 1 can be tilted rearward at a required angle with the pivot 1 as a pivot point to be in a reclining state. At the same time, link 1
5 rotates clockwise around the support shaft 16, so that the seat cushion 2 can be inclined such that the rear end side is lower than the front end side. When the seat cushion 2 is tilted rearward and downward in conjunction with the seat back 3 in this manner, the so-called butt-slip state can be prevented without the butt portion of the occupant shifting forward.

[0007]

In the conventional vehicle seat shown in FIG. 5, when the seat back 3 is tilted to be in a reclining state, the buttocks shift forward and a so-called asslip state occurs. Further, when this hip slip occurs, the waist portion of the seat back 3 that is in contact with the lumbar support 9 descends, so that a so-called hip slip also occurs. Therefore, seat back 3
The distance A (about 150 mm) to the waist portion that is in contact with the lumbar support 9 greatly changes to the distance B (about 210 mm) in the reclining state. As a result, the posture at the time of reclining becomes unstable.
Also, accompanying with this, clothes such as a Y-shirt or a blouse worn by the occupant H, especially the clothes sandwiched between the lumbar region of the occupant and the seat back, are shifted so as to protrude from the pants or skirt. Failure occurs. For this reason, when the occupant H stands up, it is necessary to raise the pants or the skirt or put the clothes in the pants or the skirt.

In the conventional vehicle seat shown in FIG. 6, since the intersection angle between the seat cushion 2 and the seat back 3 does not change so much, it is possible to prevent the hips from slipping in the reclining state. Although having an advantage, since the rear end side of the seat cushion 2 is lowered independently of the seat back 3,
Similar to the conventional seat 1 shown in FIG. 5, a waist slip occurs, and the distance (A) from the hip to the lumbar support hitting the lumbar support at the time of the upright increases when the vehicle is in the reclining state. As a result, the posture becomes unstable, and there is a problem that the clothes worn by the occupant protrude from the pants or skirt.

As described above, all of the above-mentioned conventional seats have a so-called waist-shift state in which the waist portion hitting the lumbar support is lowered when the seat is in the reclining state, so that a stable posture can be maintained during reclining. In addition, there was a problem that the clothes protruded. Therefore, there has been a problem that stability and comfort are lacking, and the occupant is uncomfortable.

Therefore, the present inventor has studied such a problem, and as a result, when the rotation fulcrum of the seat cushion and the seat back coincide, the seat back is inclined backward by a predetermined angle and the seat cushion is inclined backward and downward. Also, it was confirmed that the distance from the buttocks to the waist portion hitting the lumbar support did not change significantly, and that it was possible to reliably prevent the waist from slipping and the clothes from protruding.

The present invention has been made on the basis of the above-mentioned conventional problems and the results of the study. The purpose of the present invention is to provide a simple structure, and even when switching from the upright state to the reclining state, the waist slippage and the protrusion of the clothes are prevented. It is an object of the present invention to provide a vehicle seat that is less likely to have improved stability and comfort.

[0012]

According to a first aspect of the present invention, there is provided a tiltable seat frame supported substantially horizontally on a base frame, and a rear end side of the seat frame. In a vehicle seat equipped with a tiltable backrest frame having a lower end connected to a lower end side, and a reclining drive device, the backrest frame is tilted rearward at a required angle, and the seat frame is simultaneously moved to the rear end. Side is tilted so as to be lower than the front end side, and the frame for the backrest and the frame for the seat portion are connected so as to tilt with the connecting portion of these two frames as a pivot point. I do.

According to a second aspect of the present invention, in the first aspect, the rear end of the seat frame is supported by the seat angle variable mechanism together with the backrest frame, and the rearward movement of the backrest frame is performed. And is lowered together with the leaning frame.

In the present invention having such a structure, since the pivots of the frame for the seat and the frame for the backrest are made to coincide with each other, the so-called waist shift amount generated when the state is switched from the upright state to the reclining state. Can be relatively reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. 1 (a) and 1 (b) are views showing a state of a vehicle seat according to the present invention at the time of upright and reclining, and FIG. 2 is a perspective view of a seat angle variable mechanism. In the drawings, the same components as those shown in the section of the prior art are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, a vehicle seat 30 includes a base frame 8 installed on the floor 4 of the vehicle, a tiltable seat frame 32 installed substantially horizontally on the base frame 8, and A tiltable backrest frame 6 connected to the rear end of the seat frame 32, and the backrest frame 6 is tilted rearward by a required angle and simultaneously with the rearward movement of the seat frame 32 to move the rearward. A seat lock (reclining drive device) 5 that tilts so that the end side is lower than the front end side is provided.

The base frame 8 has a leg 8a and a pair of front and rear pipes 35A and 35B. The front rod 35A is connected to the piston rod 5a of the seat lock 5 and provided with a rotating shaft 36. Have been. On the other hand, the rear pipe 35B is located lower than the front pipe 35A, and the lower end of the backrest frame 6 is connected via a seat angle variable mechanism 37 described later.

The seat frame 32 is provided with the seat cushion 2, a front end of the seat frame 32 is rotatably supported in the up-down direction by the rotation shaft 36, and a rear end of the support shaft 39 provided on the backrest frame 6. Is rotatably supported at Therefore, at the time of the upright, as shown in FIG. 1A, it is held substantially horizontally, and
As shown in (b), when the support shaft 39 is tilted rearward at a required angle with the support shaft 39 as a rotation fulcrum to enter a reclined state, it is rotated in conjunction with this and the rear end side is lower than the front end side.

The back frame 6 is a seat back 3.
The lower end is connected to the seat angle varying mechanism 37, so that the seat frame 3 is held substantially upright at the time of upright and the seat frame 3 at the time of reclining.
2 and is configured to be tilted rearward at a required angle with the rotation shaft 39 as a rotation fulcrum.

In FIG. 2, the seat angle variable mechanism 37
Are a pair of left and right slide guides 40 attached to the pipe 35B, a connecting rod 4 connecting the lower end of the backrest frame 6 and the seat lock 5, and
1 and so on. Each slide guide 40 is formed with a long hole 42 inclined forward and downward at a required angle, and a roller 43 attached to an end of the connecting rod 41 is inserted into this long hole 42 so as to roll freely. I have.

The seat lock 5 includes the piston rod 5a, a cylinder 5b in which incompressible gas is filled, and the like. The cylinder 5b is rotatably connected to the connecting rod 41. The seat lock 5 is configured such that the piston rod 5a expands and contracts by opening and closing a valve by switch means such as a push button and a lever (not shown) provided on the base frame 8 and the like. Such a seat lock 5 is a conventional well-known type generally sold under the name of a gas spring, and is the same as that widely used in, for example, a height-adjustable chair driving device. The description of the detailed structure is omitted.

The vehicle seat 30 having such a configuration
At the time of upright, the piston rod 5a is held in a state of being extended to the maximum length as shown in FIG. In this state, the cylinder 5b is held at the most retracted position and presses the roller 43 against the rear end side wall of the elongated hole 42, thereby holding the sheet 30 in the upright state. Therefore, the seat frame 32 is held in a substantially horizontal state, and the backrest frame 6 is held in a substantially upright state.

Next, when the seat lock 5 is actuated in this upright state, the piston rod 5a is attached to the base frame 8 and cannot move, so the cylinder 5b moves forward and slides the roller 43. The guide 40 is moved forward along the long hole 42. As a result, the backrest frame 6 is gradually lowered, and is rotated rearward about the rotation shaft 39 as a rotation fulcrum, thereby entering a reclining state. Therefore, the rear end of the seat frame 32 also descends and becomes lower than the front end. FIG. 1B shows this state. Note that the maximum inclination angle of the backrest frame 6 is determined by the movement stroke of the cylinder 5b, in other words, the length of the long hole 42 or the inclination angle of the long hole 42,
If it is within the maximum inclination angle, it is also possible to stop the backrest frame 6 at an arbitrary angle position by operating the switch means.

In such a vehicle seat 30,
Rotating fulcrum 3 of the frame 32 for the seat and the frame 6 for the backrest
9 and the truss frame 6 is held by the seat angle variable mechanism 37 so as to be able to move up and down together with the truss frame 6, so that the waist slip caused when the upright state is changed to the reclining state is reduced. Can be significantly reduced. In other words, when the seat back 3 is lowered and the seat cushion 2 is tilted backward and switched from the upright state to the reclining state, the distance A from the buttocks to the waist portion hitting the lumbar support 9 changes to become the distance B. . However, since the relative position of the seat cushion 2 and the seat back 3 in the height direction only slightly changes according to the inclination angle of the backrest frame 6, the change from the distance A to the distance B is also slight, For example, if distance A = 150 mm, distance B
Is about 160 mm. Therefore, FIGS. 5 and 6
The seat has a smaller amount of hip slip (BA) as compared with the conventional seat shown in (1), and the stability and comfort when the seat is in the reclining state can be improved. In addition, if the amount of waist slip is small, the amount of clothes worn by the occupant H protruding from the pants or skirt is small, and discomfort can be reduced.

FIG. 3 is a perspective view of a main part showing another embodiment of the seat angle varying mechanism. In this embodiment, a drive motor (not shown) is used in place of the seat lock as a drive device of the seat angle variable mechanism 37, and the rotation is transmitted to the backrest frame via the rack 50 and the pinion 51. are doing. The front end of the rack 50 is shown in FIG.
Is rotatably connected to the pipe 35A shown in FIG. The other configuration is completely the same as the above-described embodiment.

Even in such a structure, the pinion 51 is rotated by driving a drive motor having a speed reduction mechanism.
When the rack (or worm gear) 50 is moved forward, the back frame can be tilted rearward and the seat frame can be tilted rearward downward as in the above-described embodiment. In addition, the hip displacement is small, and the same effect as in the above embodiment can be obtained. In addition,
The use of a worm and a worm wheel instead of the rack 50 and the pinion 51 is effective when a large driving force is required. In this case, both ends of the worm may be rotatably connected to the pipe 35A and the connecting rod 41.

FIGS. 4 (a) and 4 (b) are a perspective view and a side view of a main portion showing still another embodiment of the seat angle varying mechanism. In this embodiment, the lower end of the backrest frame 6 and the pipe 35B are connected via a link 60, a driving motor 61 is used as a driving device of the seat angle varying mechanism 37, and the rotation is transmitted via a gear train 62. By transmitting the link to the link 60, the backrest frame 6 is moved up and down. The solid line shows the state at the time of reclining, and the dashed line shows the state at the time of upright. The other configuration is the same as that of the above-described embodiment.

Even in such a structure, when the seat back is lowered and the seat cushion is inclined backward and switched from the upright state to the reclining state, the hip displacement is small, and the same effect as in the above-described embodiment can be obtained. be able to.

[0029]

As described above, in the vehicle seat according to the present invention, the so-called waist misalignment caused when the backrest frame is tilted from the substantially upright upright state to the reclined state inclined backward by a required angle. Can be reduced, so that the clothes do not protrude, and the posture stability and comfort during reclining can be improved. Further, the structure of the seat angle variable mechanism is simple and can be provided at low cost.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a state of a vehicle seat according to the present invention at the time of uplighting and at the time of reclining.

FIG. 2 is a perspective view of a seat angle varying mechanism.

FIG. 3 is a perspective view showing another embodiment of a seat angle variable mechanism.

FIGS. 4A and 4B are a perspective view and a side view of a main part showing still another embodiment of the seat angle varying mechanism.

FIGS. 5 (a) and 5 (b) are views showing a state of a conventional vehicle seat at the time of uplighting and at the time of reclining.

FIG. 6 is a side view of a main part showing another conventional example of a vehicle seat.

[Explanation of symbols]

2 ... Seat cushion, 3 ... Seat back, 5 ... Seat lock, 6 ... Seat frame, 8 ... Base frame,
DESCRIPTION OF SYMBOLS 30 ... Vehicle seat, 32 ... Seat frame, 36 ... Rotating shaft, 37 ... Seat angle variable mechanism, 39 ... Rotating shaft, 40 ...
Slide guide, 41: connecting rod, 42: long hole, 43: roller, 50: rack, 51: pinion, 60: link.

Claims (2)

[Claims] 1. A tiltable seat frame supported substantially horizontally on a base frame, a tiltable backrest frame having a lower end connected to a rear end of the seat frame, and a reclining frame. A vehicle seat provided with a driving device, wherein the backrest frame is tilted rearward at a required angle, and at the same time, the seat frame is tilted so that the rear end side is lower than the front end side, A vehicle seat, wherein a shear frame and the seat frame are connected so as to be tilted about a connecting portion between the two frames as a pivot point. 2. The vehicle seat according to claim 1, wherein a rear end of the seat frame is supported by a seat angle variable mechanism together with a rear frame, and the rear frame is rotated by the rearward rotation of the rear frame. A vehicle seat which is lowered together with a shear frame.