JPH08173268A - Seat for vehicle - Google Patents

Abstract

PURPOSE: To prevent the hip sliding and to expand the hip angle, within the operating angle scope of the forward and rearward tilting of a seat back, and to improve the supporting condition from the pelvis to the thoracic verteverae, by applying a swing mechanism to swing a seat cushion interlocking with the tilting operation of the seat back to the rear surface side. CONSTITUTION: An arm bracket 22 whose lower end 22a is extended to a base frame side is fitted to a seat back 14. A bracket 32 is fitted at the rear end side lower part of a seat cushion, and the other end of the rear side first link 33 whose one end is journalled to the lower end side of the arm bracket 22 is journalled to the bracket 32. The other end of the rear side second link 34 whose one end is journalled to the base frame side is journalled, in the condition fastening commonly with the rear side first link 33. A front side link 35 is attached to the front end side of the seat cushion.

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 application to, for example, a rotary seat which supports a seat body on the floor surface of a passenger compartment in a rotatable manner. A base frame, a seat cushion supported on the base frame in a substantially horizontal posture, and a seat cushion standing upright on the rear end side of the seat cushion on the base frame and supported so as to be tiltable in the seat longitudinal direction. The present invention relates to a vehicle seat that includes a seat back that is open.

[0002]

2. Description of the Related Art Generally, a vehicle seat comprises a seat cushion and a seat back standing upright behind the seat cushion.
In addition, the seat back is configured to be tiltable in the longitudinal direction of the seat by a reclining mechanism, or the seat frame that supports the entire seat is supported on the floor surface of the vehicle body by a longitudinal slide device or the like to adjust the movement in the longitudinal direction of the vehicle body. By adopting such a configuration, it is possible to deal with the body shape and taste of the seated person and obtain a seated state suitable for the seated person.

Further, in recent years, the seat cushion portion of the seat is supported via a lifter mechanism such as a parallel link mechanism, which is translated in the vertical direction, or the front end of the slide rail is curved upward. In accordance with this, various proposals have been made for those in which the seat cushion can be adjusted more appropriately by swinging the seat cushion.

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 swinging motion of the seat cushion is adopted when the seated position of the seated person is easily displaced and the seating posture becomes unstable, as in the case where the seat back is tilted toward the seat back side. It is effective.

[0005]

However, in the conventionally known vehicle seat lifter mechanism, the seat cushion is swung according to the physique and preference of the seated person, regardless of the seat back. Many of them are seated, and when the seat back is tilted, the occupant operates the lifter mechanism to swing the seat back according to the change in the seating posture, causing a problem in terms of operability. In addition, the structure including the operation section became complicated, which was a problem in practical use.

As a vehicle seat, for example, a rotary seat for a railway vehicle is known in which the direction of the seat can be changed and adjusted according to the preference and demand of a seated person. The swing mechanism of the seat cushion described above cannot be easily applied to the rotary seat.

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.

Further, when the seat back is in the upright state, the hip angle is only about 90 °, and it is not possible to take a comfortable posture. Further, when the seat back is tilted backward, the hip slippage occurs. There is a risk that the seated state is likely to occur, the support state from the pelvis to the thoracic vertebra deteriorates in a seated state for a long time, and there is a fear that fatigue easily occurs.

In view of the above circumstances, the present invention employs a simple swing mechanism that allows the seat cushion to swing in conjunction with the tilting movement of the seat back toward the back side, thereby allowing the seat back to tilt forward and backward. It is an object of the present invention to obtain a vehicle seat that prevents hip slippage, expands the hip angle, has excellent support from the pelvis to the thoracic spine, and is free from fatigue in the working angle range.

[0010]

The present invention has been made in view of the above-mentioned problems, and a vehicle seat according to claim 1 of the present invention includes a base frame and a substantially horizontal posture state on the base frame. In a vehicle seat including a seat cushion that is supported while being retained, and a seat back that is erected on the rear end side of the seat cushion on the base frame and is supported so as to be tiltable in the front-rear direction of the seat, Upper portions of arm brackets are fixed to both sides of the seat back, the arm brackets are rotatably supported by brackets provided on the rear side of the base frame, and the lower ends of the arm brackets are attached to the base frame side. The seat cushion is extended, and one end is pivotally supported on the lower end side of the arm bracket by a bracket provided on the lower portion on the rear end side. The other end of the rear first link and the other end of the rear second link whose one end is pivotally supported on the base frame side are pivotally supported together in a tightened state, and the front link is attached to the lower portion of the front end side of the seat cushion. One end is pivotally supported, the other end of the front side link is pivotally supported at the front end of the base frame, and when the seat back is tilted rearward, the lower end of the arm bracket rotates forward and the rear side first link and The seat cushion is moved forward by the second rear link, and the front end of the seat cushion is moved upward by the rotation of the front link.

A vehicle seat according to a second aspect of the present invention includes a base frame and a seat cushion supported on the base frame in a substantially horizontal posture.
In a vehicle seat including a seat back that is erected on the rear end side of the seat cushion on the base frame and is supported so as to be tiltable in the front-rear direction of the seat, both sides of the seat back are provided with arm brackets. The upper portion is fixed, the arm bracket is pivotally supported by a bracket provided on the rear side of the base frame, the lower end portion of the arm bracket is extended to the base frame side, and the seat cushion has a rear end. In the bracket provided on the lower side, one end of the rear first link whose one end is pivotally supported on the lower end side of this arm bracket and the other end of the rear second link whose one end is pivotally supported on the base frame side are provided. The other end is pivotally supported in the tightened state, one end of the front link is pivotally supported at the lower part of the front end side of the seat cushion, and the other end of the front link is the base frame. When the seat back is tilted rearward, the lower end of the arm bracket rotates forward, and the seat cushion moves forward by the rear first link and the rear second link. The front end of the seat cushion is moved upward by the rotation of the front side link, the hip angle when the seat back is tilted forward and backward is 110 ° to 123 °, the pelvis angle is 30 ° to 45 °, and the lumbar angle. Is formed at 15 ° to 30 °, and the solux angle is formed at 10 ° to 25 °.

[0012]

According to the vehicle seat of the first aspect of the present invention, when the seat back is tilted rearward, the lower end of the arm bracket rotates forward, so that the rear first link and the rear first Since the seat cushion moves forward by the two links and the front end of the seat cushion moves upward by the rotation of the front link, the seat cushion is moved to the rear first side.
The rear end portion is moved to the front of the seat on the base frame via the second link and the second link, and at this time, the front link on the front end side of the seat cushion is moved to the front side and the upper side of the base frame side. The hip angle is enlarged, the support condition from the pelvis to the thoracic vertebra is excellent, and there is no fear of causing fatigue or the like.

According to the vehicle seat of the second aspect of the present invention, when the seat back is tilted rearward, the lower end of the arm bracket pivots forward, and the rear first link and the rear first link. Since the seat cushion moves forward by the two links and the front end of the seat cushion moves upward by the rotation of the front link, the seat cushion is moved on the base frame via the rear first and second links. The rear end is moved to the front of the seat, and at this time, the front link on the front end side of the seat cushion is moved forward and upward from the base frame side, so that hip slip is prevented, the hip angle is enlarged, and the pelvis and thoracic spine are removed. There is no risk of fatigue and the like, because the support condition is excellent.

When the seat back is tilted forward and backward, the hip angle is 110 ° to 123 ° and the pelvis angle is 30 ° to.
45 °, Lumber angle is 15 ° to 30 °, Sorrax angle is 10 ° to 25 °, so hip slippage is prevented, hip angle is expanded, and support from the pelvis to the thoracic spine is excellent, There is no fear of causing fatigue or the like.

[0015]

1 to 4 show an embodiment of a vehicle seat according to the present invention. A vehicle seat 10 is a vehicle seat as shown in FIGS. 5 (a) and 5 (b), for example. A case where the present invention is applied to a rotary seat formed by arranging individual seating seat portions 11, 11 will be described, but the present invention is not limited to such a seat structure.

In FIG. 5, reference numeral 12 is a base frame forming a seat base, 13 is a seat cushion supported on the base frame in a substantially horizontal posture, and 14 is a substantially upright position at the rear end of the seat cushion 13. The seat back is arranged in the installed state and is supported by the reclining mechanism 20 so as to be tiltable, and thereby a reclining type seat is configured. Further, in FIG. 2, reference numeral 15 is a vehicle compartment floor surface, and 18 is a U-shaped armrest when viewed from the side.

In the rotary seat 10 shown in FIG. 5, the seat 10 can be rotationally adjusted between the base frame 12 located under the seat central portion between the seat portions 11 and 11 and the floor surface 15 of the passenger compartment. A rotary disk mechanism 16 for supporting the sheet is provided so that the seat 10 as a whole can be rotationally adjusted in the horizontal direction about the mechanism 16 and its direction can be changed to an arbitrary direction.

As shown in FIGS. 1 and 2, the vehicle seat 10 includes a base frame 12, a seat cushion 13 supported on the base frame 12 in a substantially horizontal posture, and the base frame 12. The seat cushion 14 is provided upright on the rear end side of the seat cushion 13 and is supported so as to be tiltable in the front-rear direction of the seat 10. Here, in FIG. 4, 21 is a seat back frame and 31 is a seat cushion frame. Again 1
Reference numeral 8 denotes a U-shaped armrest when viewed from the side.

As shown in FIGS. 1 and 4, a bracket 17 extending in the front-rear direction is formed in the central portion of the base frame 12, and the rear portion of the bracket 17 is the seat back 1.
4 is curved and formed so as to project toward the lower end of 4. Arm brackets 22 are fixed to the lower portions of both sides of the seat back frame 21 of the seat back 14, and the arm brackets 22 are rotatably supported on the rear side of the bracket 17 by a support shaft 14a.

The lower end 22a of the arm bracket 22
Is extended toward the base frame 20 side, and the lower end portion 22a of one arm bracket 22 is extended further downward, and a fluid for tilting the seat back 14 in the seat front-rear direction is provided at the tip portion thereof. One end of an actuator 23 such as a pressure cylinder is connected and the other end is provided on the side of the base frame 12 to configure a reclining mechanism 20 capable of adjusting the tilt of the seat back 14.

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

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

Further, one end of a front link 35 is pivotally supported on the lower portion of the seat cushion frame 31 on the front end side, and the other end of the front link 35 is pivotally supported by the arm portions 36, 36 on the front end side of the base frame 12. Has been done.

The seat cushion 13 is normally urged toward the rear end side of the seat 10 by a tension spring 40 that is hung between the seat cushion 13 and the rear end side of the base plate 12, and the seat back 14 is In this biased state, the link mechanism including the rear first and second links 33, 34 and the like maintains a substantially upright state.

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

When the seat back 14 is tilted toward the back side of the seat 10 by the actuator 23, the seat cushion 13 is moved on the base frame 12 via the rear first and second links 33 and 34. The rear end portion moves to the front of the seat 10.

At this time, the front link 35 on the front end side of the seat cushion 13 rotates in a direction in which the seat cushion 13 stands up from the inclined state, and the front end portion of the seat cushion 13 is moved from the rear end side to the first end. By being pressed by the first and second links 33, 34, A in FIG.
Only the dimension indicated by B moves diagonally upward in front of the seat 10. The size of A is 30 mm, and the size of B is 20 mm.
mm is preferred but not limited to this.

Of course, the actuator 23 is operated in reverse,
When the seat back 14 is raised, the seat cushion 13 also returns to its original state by the rear first and second links 33, 34 and the front link 35. 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.

When the seat pitch is 970 mm, the hip angle when the seat back 14 is tilted forward and backward is 110.
° to 123 °, the pelvis angle which is the angle of the pelvic support portion of the seat back 14 is 30 ° to 45 °, the lumbar angle which is the angle of the lumbar support portion is 15 ° to 30 °, and the angle of the thoracic spine support portion. Since the thorax angle is formed at 10 ° to 25 °, the hip slip is prevented, the hip angle is enlarged, the support condition from the pelvis to the thoracic vertebra is excellent, and there is no fear of causing fatigue or the like.

Particularly, in the above-mentioned structure, the seat back 1
The seat cushion 1
It is possible to relatively easily obtain the simple swing mechanism 30 capable of swinging 3 to prevent forward displacement and obtaining 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 a base frame 12 is supported on a turntable mechanism 16 to obtain a suitable simple swing mechanism. it can.

The present invention is not limited to the structure of the above-described embodiment, but the shape, structure, etc. of each part may be modified as necessary.
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.

Further, in the above-described embodiment, the front link 35 is provided in a part of the seat cushion frame 31, but
The mounting position and shape of the front link 35 can be appropriately modified and changed.

[0033]

As described above, according to the first aspect of the present invention.
According to the vehicle seat of the invention, the upper parts of the arm brackets are fixed to both sides of the seat back, and the arm brackets are rotatably supported by the brackets provided on the rear side of the base frame. A lower end portion of the rear side first link is extended to the base frame side, and the seat cushion has a bracket provided at a lower portion of a rear end side thereof, and the other end of the rear first link whose one end is pivotally supported on the lower end side of the arm bracket, And the other end of the rear side second link whose one end is pivotally supported on the side of the base frame is also pivotally supported in the tightened state, and one end of the front side link is pivotally supported on the lower part of the front end side of the seat cushion. When the seat back is tilted rearward, the lower end of the arm bracket rotates forward when the end is pivotally supported by the front end of the base frame, and the rear first link and the rear second reliever. As the seat cushion moves forward due to the ratcheting, and the front end of the seat cushion moves upward due to the rotation of the front side link, the hip slip is prevented, the hip angle is enlarged, and the pelvis to the thoracic vertebrae are expanded. The support is excellent, and there is no risk of fatigue.

Further, according to the vehicle seat of claim 2 of the present invention, when the seat back is tilted rearward, the lower end of the arm bracket rotates forward, and the rear first link and the rear side. The seat cushion moves forward due to the second link, and the front end of the seat cushion moves upward due to the rotation of the front side link.
The rear end portion is moved forward of the seat on the base frame via the rear first and second links, and at this time, the front link on the front end side of the seat cushion is moved forward and upward from the base frame side. Therefore, the hip slippage is prevented, the hip angle is enlarged, the support condition from the pelvis to the thoracic vertebra is excellent, and there is no fear of causing fatigue or the like.

When the seat back is tilted forward and backward, the hip angle is 110 ° to 123 ° and the pelvis angle is 30 ° to.
45 °, Lumber angle is 15 ° to 30 °, Sorrax angle is 10 ° to 25 °, so hip slippage is prevented, hip angle is expanded, and support from the pelvis to the thoracic spine is excellent, There is no fear of causing fatigue or the like. In particular, according to the present invention, it is possible to obtain a simple swing mechanism suitable for application to a rotary vehicle seat or the like.

[Brief description of 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 side view of a vehicle seat according to the present invention.

FIG. 3 is a side view showing a tilted state of a seat back of a vehicle seat according to the present invention.

FIG. 4 is a schematic perspective view showing a seat frame structure of a main part characterizing the present invention.

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

[Explanation of symbols]

 10 Vehicle Seat 11 Seat Seat 12 Base Frame 13 Seat Cushion 14 Seat Back 15 Cabin Floor 16 Rotating Disk Mechanism 17 Bracket 18 Arm Rest 20 Reclining Mechanism 21 Seat Back Frame 22 Arm Bracket 22a Lower End 22b Pipe 23 Actuator 24 Arm 28 Connection Shaft Member 30 Swing Mechanism 31 Seat Cushion Frame 32 Bracket 33 Rear First Link 34 Rear Second Link 35 Front Link 40 Tension Spring

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuuji Tagawa 771 Koen, Ayase City, Kanagawa Prefecture Ikeda Bussan Co., Ltd.

Claims (2)

[Claims] 1. A base frame, a seat cushion supported on the base frame in a substantially horizontal posture, and a standing position on the rear end side of the seat cushion on the base frame. In a vehicle seat including a seat back tiltably supported by the vehicle body, upper portions of arm brackets are fixed to both side portions of the seat back, and the arm brackets are attached to brackets provided on a rear side of the base frame. The arm cushion is movably supported, and the lower end of the arm bracket is extended to the base frame side.The seat cushion is supported by a bracket provided on a lower portion of a rear end side of the arm cushion so that one end is pivotally supported on a lower end side of the arm bracket. The other end of the rear side first link and the other end of the rear side second link whose one end is pivotally supported on the base frame side. When the seat back is tilted rearward, one end of the front link is pivotally supported at the lower part of the front end side of the seat cushion, and the other end of the front link is pivotally supported at the front end of the base frame. The lower end of the arm bracket pivots forward, the seat cushion moves forward by the rear first link and the rear second link, and the front end of the seat cushion moves upward by pivoting the front link. The vehicle seat is characterized by 2. A base frame, a seat cushion supported on the base frame in a substantially horizontal posture, and a standing position on the rear end side of the seat cushion on the base frame. In a vehicle seat including a seat back tiltably supported by the vehicle body, upper portions of arm brackets are fixed to both side portions of the seat back, and the arm brackets are attached to brackets provided on a rear side of the base frame. The arm cushion is movably supported, and the lower end of the arm bracket is extended to the base frame side.The seat cushion is supported by a bracket provided on a lower portion of a rear end side of the arm cushion so that one end is pivotally supported on a lower end side of the arm bracket. The other end of the rear side first link and the other end of the rear side second link whose one end is pivotally supported on the base frame side. When the seat back is tilted rearward, one end of the front link is pivotally supported at the lower part of the front end side of the seat cushion, and the other end of the front link is pivotally supported at the front end of the base frame. The lower end of the arm bracket is rotated forward, the seat cushion is moved forward by the rear first link and the rear second link, and the front end of the seat cushion is moved upward by the rotation of the front link. In addition, the hip angle when the seat back is tilted back and forth is 110 ° to 123.
°, Pervis angle 30 ° to 45 °, Lumber angle 15 °
A vehicle seat, characterized in that the vehicle seat is formed in a range of up to -30 ° and a solux angle of 10 ° to 25 °.