JP2599888Y2 - Lumber support mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumbar support mechanism which has a simple structure, is excellent in operability and light weight, and has a large adjustment range of a support range.

[0002]

2. Description of the Related Art For example, in recent automobile seats and the like, various types in which a lumbar support mechanism is incorporated in a backrest portion of the seat have been developed for the purpose of improving sitting comfort performance. Kaisho 62─1
Many proposals have been made, for example, in Japanese Patent No. 5252 and Japanese Utility Model Application Laid-Open No. 62-65838.

However, the conventional one is a mechanism in which the support plate is adjusted by a gear mechanism, a notch lock mechanism, a link mechanism, or the like, so that the structure is complicated and the operation is complicated. There was also a problem that the adjustment width was too small to make a sufficiently satisfactory adjustment. Furthermore, there is a problem that the weight is heavy and the weight cannot be reduced, and the number of parts is large, so that it takes a long time for assembling work and the like.

[0004]

[Problems to be solved by the invention] The present invention solves the conventional problems as described above, has a simple structure, is excellent in operability, has a large adjustment range of a support range, and has any body shape and driving posture. To provide a lumbar support mechanism that can attach a sheet exactly to the same, can reduce the number of parts, greatly reduce the weight, facilitate assembly work, and reduce the manufacturing cost. It was completed for the purpose.

[0005]

The lumbar support mechanism of the present invention, which has been made to solve the above-mentioned problems, has a seat.
Front and rear leaves of different lengths on the backrest frame of the back
Attach a spring with its upper end to
Attach the support plate to the lower end of the ring,
And between the upper parts of both leaf springs by external operation
The eccentric cam is arranged and the support is
It is characterized in that the plate for the plate can be adjusted back and forth
It is assumed that.

[0006]

With the above-described structure, the user can adjust the support plate in the front-rear position by an external operation in a state where the support plate is incorporated in the seat back and use the support plate. Same as lumbar support mechanism, but
Adjustment of the support plate in the front-rear direction can be performed very easily since the eccentric cam disposed on the back surface of the upper portion of the leaf spring can be rotated by an external operation.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The drawing shows a state in which it is incorporated in an automobile seat back 20. In FIG.
a and 2b are two long and short resilient front and rear leaf springs attached to the backrest portion frame 1 via the bracket 3, and 4 is a support plate mounted on the tip of both leaf springs 2a and 2b. The two long and short leaf springs 2a and 2b shown in the embodiment have a substantially C-shape that is bent and formed while maintaining a gap of substantially constant width in the front and rear directions. It is attached and suspended with parts. A spring receiving frame 5 is provided below the backrest frame 1 so as to abut against a leaf spring 2b on the rear side to restrict the movement to the rear side. The leaf springs 2a and 2b are formed of a single elastic material as shown in FIG.
It may be formed of one elastic material cut at the position of the bracket 3 , and its material, shape, gap length, and the like can be arbitrary according to the sheet shape and the like.

Then, the front leaf spring described above is used.
2 leaf springs so that they contact the back of the upper part of 2a
A rotatable eccentric cam 6 is provided between the upper portions of 2a and 2b. The eccentric cam 6 is attached to a shaft 8 supported by bearing plates 7 on both sides of the backrest frame 1, and a rotation knob 9 provided at one end of the shaft 8.
The leaf springs 2a and 2b are configured to be freely rotated between the leaf springs 2a and 2b by an external operation such as rotation or switch operation.

The above-described structure is such that a user adjusts the support plate 4 in the front-rear position by an external operation in a state where the support plate 4 is incorporated in the seat back 20 and is used for use. This type of lumbar support mechanism is the same as that of the lumbar support mechanism, except that the front and rear position of the support plate 4 is adjusted by turning the eccentric cam 6 provided between the front and rear leaf springs 2a and 2b in the embodiment. The movement makes it very easy. That is, when the eccentric cam 6 is rotated by rotating the rotation knob 9 on the side of the seat, the gap between the leaf springs 2a and 2b changes according to the amount of eccentricity of the eccentric cam 6, and in this case, FIG.
As shown in (2), since the spring receiving frame 5 is in contact with the leaf spring 2b on the rear side and the movement to the rear side is restricted, when the eccentric amount of the eccentric cam 6 increases, the distance between the leaf springs 2a and 2b increases. The gap is widened toward the front, and accordingly, the support plate 4 attached to the distal ends of the leaf springs 2a and 2b moves forward to more strongly support the backrest surface of the seat back 20 from the inside. .

The support of the support plate 4 can be weakened by operating the eccentric cam 6 so as to narrow the gap between the leaf springs 2a and 2b. The degree can be set arbitrarily, and the range of the adjustment width can be freely selected by increasing the amount of displacement of the eccentric cam 6. Further, in the above-described embodiment, the description has been given of the case where the support plate 4 is constituted by one sheet. However, as shown in FIG. 4, the support plates 4 which are independent from each other at the distal ends of the leaf springs 2a and 2b, 4 can be attached,
In this case, finer adjustment than before and after, up and down, etc. can be realized.

Since the lumbar support mechanism according to the present invention has a very simple and compact structure, it can be similarly incorporated in the headrest portion 21 as shown in FIG. The supportability can be adjusted to an arbitrary level to maintain a more comfortable driving posture.

[0012]

[Effects of the Invention] As is clear from the above description, the present invention has a simple structure, is excellent in operability, has a large support range adjustment range, and is suitable for any type of body and driving posture. Along with
The number of parts is small and the weight can be significantly reduced, the assembling work can be facilitated, and the manufacturing cost can be reduced. Therefore, the present invention has a very large practical value as a lumbar support mechanism that has eliminated the conventional problems.

[Brief description of the drawings]

FIG. 1 is an overall perspective view showing an embodiment of the present invention.

FIG. 2 is a side view showing a main part of the embodiment of the present invention.

FIG. 3 is a rear view showing a main part of the embodiment of the present invention;

FIG. 4 is a perspective view of a main part showing another embodiment.

FIG. 5 is a side view showing another embodiment.

[Explanation of symbols]

 Reference Signs List 1 backrest frame 2a leaf spring 2b leaf spring 4 support plate 6 eccentric cam 20 seat back

Claims (3)

(57) [Scope of request for utility model registration] 1. A backrest frame of a seat back (20).
(1) The front and rear leaf springs (2a) and (2b) with different lengths
The leaf spring (2
Attach the support plate (4) to the lower ends of a) and (2b),
Furthermore, between the upper parts of both leaf springs (2a) and (2b)
An eccentric cam (6) that is rotated by an external operation is arranged and
The support plate (4) is adjusted back and forth by turning the arm (6).
Lumbar support machine characterized by being free to use
Structure. 2. A front leaf spring (2a) and a rear leaf spring.
The leaf spring (2b) is formed in a series.
The lumbar support mechanism described in 1. 3. The front and rear leaf springs (2a) and (2b)
Separate support plates (4) at the bottom
3. The lumbar support machine according to claim 1 or 2, wherein
Structure.