JP2627240B2 - Vehicle seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat suitable for use as a rotary seat or the like which supports a seat body so as to be rotatable on the floor of a passenger compartment. The present invention relates to a vehicle seat configured to be capable of swinging so that the front end portion of the seat cushion moves obliquely upward in front of the seat when the seat cushion is tilted.

[0002]

2. Description of the Related Art In general, a vehicle seat comprises a seat cushion and a seat back provided upright behind the seat cushion.
In addition, the seat back can be configured to be tiltable in the front-rear direction by a reclining mechanism, or the seat frame that supports the entire seat is supported on the floor of the vehicle by a front-rear slide device, etc., to adjust the movement of the vehicle in the front-rear direction. By doing so, it is possible to cope with the physique and preference of the occupant and to obtain an appropriate sitting state for the occupant.

Further, in recent years, a seat cushion portion of a seat is supported via a lifter mechanism such as a parallel link mechanism and the like, and is vertically moved in parallel, or the front end of a slide rail is curved upward. There have been proposed various types of seat cushions in which the seating state can be adjusted more appropriately by swinging the seat cushion accordingly.

That is, in this type of vehicle seat, the front end of the seat cushion moves obliquely upward in front of the seat, and the rear end of the seat cushion descends downwardly. When the swinging motion is performed, it is possible to prevent the seat part of the seated person from shifting forward, and to exert an effect in obtaining a stable seated state. In particular, such a swing operation of the seat cushion is adopted when the seating position of the seated person is likely to shift and the seating posture becomes unstable, such as when the seat back is tilted to the seat back side. It is effective.

[0005]

However, in a conventionally known vehicle seat lifter mechanism, a seat cushion swings according to the physique and preference of a seated person irrespective of a seat back. In many cases, when the seat back is tilted, the occupant operates the lifter mechanism in accordance with the change in the seating posture and swings the seat back to a predetermined posture state. In addition, the structure including the operation unit becomes complicated, which is a problem in practical use.

Further, as a vehicle seat, for example, a rotary seat having a configuration in which the orientation of the seat can be changed and adjusted according to the preference and demand of a seated person is also known. In addition, a problem arises when the above-described seat cushion swing mechanism is employed.

That is, as this kind of rotary type vehicle seat, a rotation adjusting mechanism such as a face-to-face type or a shaft-up rotary type is provided below the seat body and interposed between the seat body and the floor of the passenger compartment. The lifter mechanism as described above cannot be applied as it is.

In swinging the seat cushion, the seat back is tilted in conjunction with the tilting operation of the seat back.
A simple type structure that can prevent the seated person from moving forward and stabilize the seating posture can be obtained, and in consideration of such points, the seat cushion is required in conjunction with the seat back. There is a demand for a simplified vehicle seat that can be operated in such a state.

In view of such circumstances, the present invention provides a vehicle seat employing a simple type of swing mechanism capable of swinging a seat cushion in conjunction with a tilting operation of a seat back toward a back side. It is intended to be.

[0010]

In order to meet such a demand, a vehicle seat according to the present invention comprises a base frame,
A seat cushion supported in a substantially horizontal posture above the seat cushion, and a seat back erected on the rear end side of the seat cushion on the base frame and supported so as to be tiltable in the seat front-rear direction. Arm bracket that is rotatably supported on the side and has a lower end extending to the base frame side, and one end is supported at the lower end of the arm bracket by a bracket provided at the lower rear end of the seat cushion. The other end of the first link and the other end of the second link, one end of which is pivotally supported on the base frame side, are pivotally supported in a tightened state, and are inclined obliquely downward toward the rear end toward the lower front end. Providing a cam member having a cam surface,
The cam surface is movably supported by rollers provided on the base frame side, and the seat cushion is normally urged toward the rear end of the seat, and in this state, the seat back is first and second. The link is configured to maintain a substantially upright state.

[0011]

According to the present invention, the seat cushion is normally urged toward the rear end of the seat, and in this state, the seat back is maintained substantially upright by the first and second links, and the seat back is maintained. By inclining the back to the back side of the seat, the seat cushion is operated via the first and second links so that the rear end of the seat cushion descends obliquely downward in front of the seat on the base frame. Sometimes, the cam surface of the cam member on the front end side of the seat cushion is supported in a rolling state by rollers on the base frame side, so that the front end of the seat cushion is moved from the rear end side to the first and second seat cushions. , And swings to move diagonally upward in front of the seat.

[0012]

1 to 4 show an embodiment of a vehicle seat according to the present invention. In these figures, a reclining mechanism 20 and a swing mechanism 30 of a vehicle seat indicated by reference numeral 10 are generally shown. , Has the following configuration. Here, as the vehicle seat 10, for example, a rotary seat having two seating seat portions 11, 11 as shown in FIGS.
There is a general sheet as shown in FIG.
A case in which the present invention is applied to the rotary seat shown in FIG. 5 will be described. However, it goes without saying that the present invention is not limited to such a sheet structure.

5 and 6, reference numeral 12 denotes a base frame constituting a seat base, 13 denotes a seat cushion supported on the base frame in a substantially horizontal posture, and 14 denotes a rear end of the seat cushion 13. The seat back is arranged in a substantially upright state and is tiltably supported by a reclining mechanism (not shown), thereby forming a reclining type seat. Further, in the figure, reference numeral 15 denotes the floor of the passenger compartment.

In the rotary seat 10 shown in FIG. 5, the seat 10 can be freely rotated between the base frame 12 located below the seat center between the seating portions 11 and 11 and the vehicle floor 15. The rotation of the entire seat 10 is adjustable about the mechanism 16 in the horizontal direction, and the direction of the seat 10 can be changed to any direction. In the case of the seat 10 shown in FIG.
The lower base frame 12 is provided so as to be freely slidable in the seat front-rear direction via a slide mechanism 17 installed on the vehicle cabin floor 15.

Now, in the vehicle seat 10 according to the present invention, the seat cushion 13 and the seat back 14
It is supported on the base frame 12 by the configuration as shown in FIGS.

That is, the vehicle seat 10 includes a base frame 12, a seat cushion 13 supported on the base frame 12 while maintaining a substantially horizontal posture, and a rear of the seat cushion 13 on the base frame 12. And a seat back 14 erected on the end side and supported so as to be tiltable in the front-rear direction of the seat 10. Here, in the figure, 21 is a seat back frame, and 31 is a seat cushion frame.

The seat back frame 21 of the seat back 14 is rotatably supported by a support shaft 14a on the base frame 12 side, and has an arm bracket 22 having a lower end 22a extending toward the base frame 20 side. It is fixed to the left and right. A lower end 22a of one of the arm brackets 22 is further extended downward, and one end of an actuator 23 such as a fluid pressure cylinder for tilting the seat back 14 in the front-rear direction of the seat is connected to a distal end thereof. The reclining mechanism 20 that can adjust the tilt of the seat back 14 is provided by providing the other end to the base frame 12 side.

A pipe 22b is supported between lower end portions 22a of the left and right arm brackets 22, and arm portions 24, 24 are provided at both end portions of the pipe 22b so as to hang downward. ing.

On the other hand, in a seat cushion frame 31 constituting the seat cushion 13, a bracket 32 provided at a lower portion on a rear end side has a first end supported by an arm portion 24 at a lower end side of the arm bracket 22. The other end of the link 33 and the other end of the second link 34, one end of which is pivotally supported on the base frame 12 side, are pivotally supported together. In the drawing, reference numeral 28 denotes each link 3 to the bracket 32 at the rear end of the seat cushion frame 31.
It is a connecting shaft member for supporting the shafts 3 and 34.

Further, a cam member 35 having a cam surface 35a inclined obliquely downward toward the rear end side is provided on the left and right sides of the lower portion of the front end side of the seat cushion frame 31.
Then, the cam surfaces 35a, 3a of these cam members 35, 35
5a is an arm 3 on the front end side of the base frame 12.
The rollers 37 and 37 provided on the rollers 6 and 36 are movably supported. In the present embodiment, the above-described cam member 35 is attached to a part of the auxiliary frame portion of the seat cushion frame 31. However, these can be freely formed integrally.

The seat cushion 13 is normally urged toward the rear end of the seat 10 by a tension spring 40 stretched between the seat cushion 13 and the rear end of the base plate 12, and the seat back 14 is In this biased state, the first and second links 33 and 34 are configured to maintain a substantially upright state by a link mechanism.

According to the above configuration, the seat cushion 1
3 is normally urged toward the rear end side of the seat 10 by the tension spring 40, and in this state, the seat back 14 is maintained in a substantially upright state by the first and second links 33 and 34 and the like.

When the seat back 14 is tilted to the rear side of the seat 10 by the actuator 23, the seat cushion 13 is connected to the first and second links 3 and 3.
Via the base plates 3 and 34, the rear end of the base frame 12 is operated so as to descend obliquely downward in front of the seat 10. At this time, the cam surface 35a of the cam member 35 on the front end side of the seat cushion 13 is
The roller 37 is supported by the rollers 37 in the rolling state so that the front end of the seat cushion 13 is moved from the rear end to the first and second links 3.
By being pressed by the members 3 and 34, it is possible to perform a swing operation so as to move obliquely upward in front of the seat 10 by the size indicated by A and B in FIG.

Of course, the actuator 23 is operated in reverse,
When the seat back 14 is raised, the seat cushion 13 also returns to the original state by the links 33 and 34, the cam member 35, and the roller 37. At this time, the urging force of the tension spring 40 is also acting on the seat cushion 13, so that the above-described returning operation can be performed smoothly and appropriately.

According to such a configuration, regardless of the tilting operation of the seat back 14 to the rear side, the seat cushion 13 can be prevented from being shifted forward by the seat cushion 13, and a stable sitting posture can be obtained. .

In particular, in the structure described above, the seat back 1
4 in conjunction with the rearward tilting movement of the seat cushion 1
4 can be relatively easily obtained by performing a swing operation on the swing mechanism 4 to prevent a forward displacement and obtain a sense of stability. Then, as shown in FIG. 5, the present invention can be applied to a rotary type vehicle seat 10 or the like in which the base frame 12 is supported on a turntable mechanism 16 to obtain a simple simplified swing mechanism. However, the present invention can be applied to a general vehicle seat 10 as shown in FIG. In short, seat back 1
The movement of No. 4 may be transmitted to the seat cushion 13 side by a link mechanism, and any swing operation may be performed.

The present invention is not limited to the structure of the embodiment described above.
It is free to change, and various modifications of each part of the vehicle seat 10 can be considered. For example, in the above-described embodiment, the tilting operation of the seat back 14 is performed by the actuator 23. However, the present invention is not limited to this, and various means may be adopted as long as the seat back 14 can be tilted.

In the above-described embodiment, the cam member 35 is provided in a part of the seat cushion frame 31, and the cam member 35 is rotatably supported by the rollers 37 provided on the base frame 12 side. It will be easily understood that the present invention is not limited to such a relationship as shown.

[0029]

As described above, according to the vehicle seat of the present invention, the base frame, the seat cushion disposed above the base frame, and the front and rear portions of the base frame which are erected on the rear end side of the seat cushion on the base frame. A seat back supported so as to be tiltable in the direction, an arm bracket which pivotally supports the seat back on the base frame side and has a lower end extending toward the base frame side, and a rear end of the seat cushion. The other end of the first link whose one end is pivotally supported on the lower end side of the arm bracket and the other end of the second link whose one end is pivotally supported on the base frame side are attached to the bracket provided at the lower side of the arm bracket together with the shaft. A cam member having a cam surface that supports and is inclined obliquely downward toward the rear end side is provided below the front end side, and the cam surface is movable by a roller provided on the base frame side. Because the seat cushion is always urged toward the rear end of the seat and the seat back is maintained in a substantially upright state by the first and second links, it is simple. Despite the structure, various excellent effects listed below are exhibited.

That is, according to the present invention, the seat cushion is tilted toward the rear side of the seat back to cause the first and second seat backs to move.
The rear end of the seat cushion is moved downward and obliquely downward in front of the seat on the base frame through the link, and the front end side of the seat cushion rolls between the cam surface of the cam member and the roller on the base frame side. Depending on the supporting state, the seat is pushed by the first and second links from the rear end side and swings so as to move diagonally upward in front of the seat. Can be obtained.

In particular, it is possible to relatively easily obtain a simple swing mechanism in which the seat cushion swings in conjunction with the tilting operation of the seat back to the rear side, thereby preventing a forward displacement and obtaining a sense of stability. Can be.

In particular, according to the present invention, it is possible to obtain a simple swing mechanism suitable for application to a rotary type vehicle seat or the like.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a vehicle seat according to the present invention,
The schematic side view which expanded the principal part.

FIG. 2 is a schematic perspective view showing a main part of a seat frame structure characterizing the present invention.

FIG. 3 is a schematic side view showing a normal seat posture in a seat frame structure characterizing the present invention.

FIG. 4 is a schematic side view of the seat frame structure that characterizes the present invention, when the seat back is tilted rearward to swing the seat cushion.

FIG. 5 shows a rotary sheet suitable for applying the present invention;
(A) is a schematic front view, (b) is a schematic side view.

FIG. 6 is a schematic side view showing a slide type sheet suitable for applying the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Vehicle seat 11 Seating seat part 12 Base frame 13 Seat cushion 14 Seat back 15 Car cabin floor 16 Turntable mechanism 17 Slide mechanism 20 Reclining mechanism 21 Seat back frame 22 Arm bracket 22a Lower end part 22b Pipe 23 Actuator 24 Arm part 28 Connecting shaft member 30 Swing mechanism 31 Seat cushion frame 32 Bracket 33 First link 34 Second link 35 Cam member 35a Cam surface 36 Arm section 37 Roller 40 Tension spring

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 5-1337 (JP, U) Japanese Utility Model 4-107638 (JP, U) Japanese Utility Model 79833 (JP, U)

Claims (1)

(57) [Claims] 1. A base frame, a seat cushion supported on the base frame while maintaining a substantially horizontal posture, and a rear end of the seat cushion standing on the base frame and tilting in a seat front-back direction. A seat back that is rotatably supported on the base frame side and has an arm bracket having a lower end extending toward the base frame side, the seat back comprising: The cushion is provided on a bracket provided at a lower portion on the rear end side, the other end of a first link whose one end is pivotally supported on the lower end side of the arm bracket, and a second end which is pivotally supported on the base frame side. The other end of the link is rotatably supported in a co-tightened state, and has a cam member having a cam surface which is inclined obliquely downward toward the rear end side at the lower front end side, The cam surface of the rubber member is movably supported by rollers provided on the base frame side, the seat cushion is normally urged toward the rear end of the seat, and the seat back is A vehicle seat configured to maintain a state of being substantially erected by the first and second links in a biased state.