JPH0228765Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vehicle seat, and more particularly to a mechanism for adjusting the operation of a lumbar support mechanism, a side support mechanism, and a folding mechanism provided in a seat back.

[Conventional technology]

The vehicle seat is equipped with a lumbar support mechanism, a side support mechanism, and a center folding mechanism so that the hardness and holdability of the back contact part of the seat back can be changed and adjusted according to the fatigue of the occupant, preference, or vehicle driving conditions. These mechanisms are configured to be operated by separate actuating members for the husband and the husband. Separately arranging these operating members would complicate the structure and be unfavorable in terms of operability and design, so they are arranged around one axis.

[Problem that the invention attempts to solve]

However, the operating members of many mechanisms are
If only one bearing is used for operation around two axes, the frictional resistance will be large, resulting in problems that the operation cannot be performed smoothly and the function cannot be performed satisfactorily.

The present invention has been made in view of these points, and provides a vehicle seat in which operating members for each support mechanism and center-folding mechanism are arranged around a single axis to enable smooth operation. The purpose is to provide.

[Means for solving problems]

The present invention provides a vehicle seat in which a seat back 2 is provided with a lumbar support mechanism 4, a side support mechanism 5, and a center folding mechanism 6.
and 18 are fixed, a cylindrical shaft 19 that operates the lumbar support mechanism 4 is inserted into the first bearing 17, and a rod-shaped shaft 20 that is inserted through the cylindrical shaft 19 and that operates the side support mechanism 5 is inserted into the second bearing 18. A lever 27 as a rotating body for operating the folding mechanism 6 is pivotally supported on the outer periphery of the cylindrical shaft 19, and an operating handle 30 straddles the cylindrical shaft 19 and the rod-like shaft 20. The cylindrical shaft 19 and the rod-shaped shaft 20 are selectively engaged with the cylindrical shaft 19 and the rod-shaped shaft 20 in the circumferential direction. At the same time, an operating lever 31 is attached to the lever 27, and the operating lever 31 rotates the lever 27 with respect to the cylindrical shaft 19. Each of the mechanisms 4, 5, and 6 respectively controls any one member of the cylindrical shaft 19, the rod-shaped shaft 20, and the lever 27 to the operating handle 30 or the operating lever 31.
The actuation can be adjusted separately by rotational operation.

[Effect]

The cylindrical shafts 1 each operate a separate mechanism in this way.
9 and the rod-shaped shaft 20 are coaxially supported by separate bearings 17 and 18, respectively, so that the reaction force in the rotation operation is received separately, and the operation can be performed smoothly, and the lever as a rotating body can be 27 is rotated about the cylindrical shaft 19 to connect the respective mechanisms 4 and 5.
and 6 are activated.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 indicates the entire vehicle seat, 2 a seat back, and 3 a seat cushion. The seat back 2 is equipped with a lumbar support mechanism 4, a side support mechanism 5, and a folding mechanism 6.

That is, a rotating shaft 8 is laterally attached to the lower part of the back frame 7 by a bracket 9, and a lumbar support plate 10 is attached to the rotating shaft 8 by a torsion spring 11 so as to be rotatable in the front-back direction. A shaft 13 is vertically attached to both sides by brackets 12, and a side support plate 14 is fixed to the shaft 13 so as to be rotatable in the inward and outward directions. Further, a movable frame 15 is pivotally supported on the upper part of the back frame 7 via a folding reclining device 16 so as to be rotatable from the upright direction to the front.

On one side 7a of the back frame 7, a first
and second bearings 17 and 18 are fixed to provide operating mechanisms for the above-mentioned mechanisms 4, 5, and 6.

The first and second bearings 17 and 18 are provided with shaft holes 17a and 18a coaxially in the lateral direction.
A cylindrical shaft 19 is rotatably supported in the shaft hole 17a of the second bearing 17, and a rod-like shaft 20 is inserted through the cylindrical shaft 19 and rotatably supported in the shaft hole 18a of the second bearing 18. is locked, a cam 21 is fixed to the inner end of the cylindrical shaft 19, and the first bearing 17
The rotating piece 22 is abutted against the rear edge of the rotating piece 22, which is pivotably mounted to be rotatable in the front-rear direction within a required range.

This rotating piece 22 and the engagement piece 23 fixed to the above-mentioned rotating shaft 8 are connected by an operating rod 24, and the rotating piece 22 is moved forward by the cam 21 by rotating the cylindrical shaft 19. When the rotary shaft 8 is pressed and rotated, the rotating shaft 8 is rotated via the operating rod 24, and this rotation causes the lumbar support plate 10 to be pushed forward via the torsion spring 11.

Also, the rod-shaped shaft 20 has a side support plate 1.
4 is provided with an engaging pin 26 that is engaged with the oblique elongated hole 25a of the engaging piece 25 provided in the rod-shaped shaft 20.
By rotating the engaging pin 26, the engaging piece 25
The side support plate 14 moves inside the inclined elongated hole 25a and pushes the engagement piece 25.
will be rotated inward about axis 13.

Further, a lever 27 as a rotating body is pivotally supported on the outer periphery of the cylindrical shaft 19, and the tip of the lever 27 and the tip of the lock release arm 28 of the folding reclining device 16 that supports the movable frame 15 are connected. They are connected by an operating rod 29, and when the lever 27 is rotated using the cylindrical shaft 19, the lock release arm 28 of the reclining device 16 is unlocked via the operating rod 29, and the movable frame 15 is rotated forward. be done.

Further, the outer end of the above-mentioned rod-shaped shaft 20 protrudes from the outer end opening of the cylindrical shaft 19, and both shafts 19, 20
An operating handle 30 is attached to the outer end of the handle 30 so as to be movable in the axial direction, and in a normal state, it is engaged in the circumferential direction only with the rod-shaped shaft 20, and when rotated in this state, only the rod-shaped shaft 20 is engaged. is rotated, and by being pushed in, it is engaged in the circumferential direction only with the cylindrical shaft 19, and when it is rotated in this pushed state, only the cylindrical shaft 19 is rotated. Also lever 27
An operating lever 31 is attached to the outer side of the holder.

With this configuration, the cylindrical shaft 19, the rod-like shaft 20, and the lever 27 can be independently rotated on the same axis, and the operation of the lumbar support mechanism 4, side support mechanism 5, and folding mechanism 6 can be independently adjusted as desired. This allows the seat back 2 to be set in the form desired by the person sitting on the seat.

In this operation adjustment, the reaction force in the rotational direction of the cylindrical shaft 19 is received by the first bearing 17, and the rod-shaped shaft 20
The axial reaction force is received by the second bearing 18, so that the lumbar support mechanism 4 and the side support mechanism 5 are reliably held in the adjusted state.
Further, since the lever 27 is only operated to release the lock, it is not subjected to a large reaction force, and therefore, almost no frictional resistance acts on the cylindrical shaft 19, so that it can be rotated smoothly.

Note that the shaft bearing mechanism, that is, the one-shaft three adjustment and holding structure in this example, is not limited to the adjustment operation mechanism of a vehicle seat, and can be applied to other devices, and the configuration is also limited to that shown in the drawings. isn't it.

[Effect of idea]

As described above, according to the present invention, the operation shaft mechanisms of the lumbar support mechanism, side support mechanism, and center bending mechanism are constructed into a single shaft by inserting a rod-shaped shaft into a cylindrical shaft, and each shaft is mounted on a separate bearing. Since the shafts are mounted and held, the reaction force applied to each shaft is received by a separate bearing, so there is no large frictional resistance between the shafts, and the rotating body supported by the cylindrical shaft does not receive a large reaction force. Since the seat is not affected by the shaft, each axis can be smoothly rotated, and the operation of the lumbar support mechanism and side support mechanism can be easily adjusted, and the adjustment and retention can be ensured.Also, the configuration is simple and does not require a large space in the seat back. It has the advantage of being able to be installed without any hassle and with good appearance.

[Brief explanation of the drawing]

FIG. 1 is a front view of an example of the back frame portion of a vehicle seat according to the present invention, FIG. 2 is an enlarged side view of the main part, FIG. 3 is an enlarged front view of the main part, and FIG. 1 is an enlarged sectional view taken along the line A-A in FIG. 1, and FIG. 5 is a perspective view of a vehicle seat to which the present invention is applied. In the figure, 1 is a vehicle seat, 2 is a seat back, 4 is a lumbar support mechanism, 5 is a side support mechanism, 6 is a folding mechanism, 7 is a back frame, 17
18 is a first bearing, 18 is a second bearing, 19 is a cylindrical shaft, 20 is a rod-shaped shaft, 27 is a lever as a rotating body, 30 is an operating handle, and 31 is an operating lever.

Claims (1)

[Claims for Utility Model Registration] A vehicle seat having a seat back with a lumbar support mechanism, a side support mechanism, and a folding mechanism, comprising: first and second bearings coaxially fixed to one side of the back frame; a cylindrical shaft rotatably attached to the first bearing; a rod-shaped shaft rotatably inserted through the cylindrical shaft and rotatably attached to the second bearing; and a rod-shaped shaft rotatably supported on the cylindrical shaft. a rotating body that is mounted so as to be movable in the axial direction of both shafts astride the cylindrical shaft and the rod-like shaft, and is selectively engaged in the circumferential direction with respect to the cylindrical shaft and the rod-like shaft by movement; an operating handle attached to the rotating body; and an operating lever attached to the rotating body, each of the mechanisms being operated by the operating handle or the operating lever of any one of the cylindrical shaft, the rod-shaped shaft, and the rotating body. A vehicle seat characterized in that its operation is adjusted separately by rotating a lever.