JPS6211491Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a lumbar support adjustment device for a seatback used in automobiles, railway vehicles, aircraft, etc., which supports the lumbar region of a seated person and reduces fatigue.
Specifically, an idler arm is brought into contact with a cam that is rotated by an operation knob, and the arm, which is stretched by a support spring, is swung back and forth through the idler arm, and the supporting force of the lumbar vertebrae is adjusted by the support spring. The present invention relates to an improvement of a lumbar support adjustment device for a seat back.

Conventionally, this type of lumbar support device (for example, Utility Model Publication No. 56-39408 filed by the present applicant) has an idler arm disposed between a cam and an arm on which a support spring is stretched. , the amount of displacement of the arm by the idler arm can be increased compared to the case where the arm is in direct contact with the cam. Therefore, the cam etc. can be made smaller, the mechanism thereof can be housed in the side frame provided on the seat back frame, and the thickness of the seat back can be made thinner. It is also widely used because it has various advantages such as weight reduction.

However, in the conventional product described above, the idler arm and the arm are parallel to each other in the left and right direction of the seat bag, and the rotation of the idler arm is transmitted to the arm by inserting the pin of the arm into the long hole provided in the idler arm. It is a structure. Therefore, a load is applied to the arm with the support spring stretched, and this load is concentrated on the pin.Moreover, since the pin is fixed to the arm, the length of the idler arm of the pin may decrease with long-term use. One part of the part that connects to the hole edge is worn out and a groove is formed. Therefore, when the arm tilts inward in the left-right direction of the seat bag under heavy load, the pin engages with the edge of the elongated hole in the idler arm, causing a problem that operation becomes heavy or impossible.

In addition, since the idler arms and the arms are parallel to each other, if one of them deforms after long-term use, it will malfunction. Also, during assembly, if the width between the left and right arms is short, the pin This can be absorbed depending on the length of the idler arm, but when it is long, the arm hits the idler arm, making assembly difficult.

The purpose of the present invention is to eliminate the disadvantages of conventional products and to prevent breakdowns even after long-term use.

The gist of the present invention to achieve such an object is to overlap and abut the idler arm on the rear side of the arm, and to adjust the length of the seat bag in the left-right direction at the part of the idler arm that abuts the arm against the arm. The width of the arm is narrower than the width of the arm at the section, and both ends of the arm in the width direction are provided with
It is equipped with a flange that protrudes toward the rear to prevent the idler arm from falling off.

Next, specific examples of the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, the longitudinal positional relationship of the support spring 4 disposed in the lower part between the back frames 2 inside the seat bag 1 with respect to the back frame 2 can be adjusted by rotating the operation knob 3 to adjust the position of the support spring 4 to the lumbar spine according to the preference of the seated person. Gain support.

In Fig. 2 and below, the support spring 4 is arranged so that the arm 11 and the support spring 4 can swing back and forth within the required range.
11', and the arms 11, 11' are connected between them by a rod 12 which is rotatably suspended horizontally between the side frames 5, 5' of the back frame 2. One end of the rod 12 is connected to one side frame 5.
The reclining device (not shown since it is not directly related to the present invention) is inserted into the bearing hole 9 of a shaped bracket 8 attached by a bolt 7 using a mounting nut 6 to be pivotally supported, and the other end is It is pivotally supported by a bracket fixed to the other side frame 5'.

Idler arm 1 is attached to the rear of one arm 11.
The contact portion 13a provided at the tip of the pin 1 is directly pressed into contact with the idler arm 13.
5, the arm 11 is pressed as the idler arm 13 rotates, and is rotated integrally with the other arm 11'.

FIG. 7 shows the contact portion 1 of this idler arm 13.
3a and the relationship between arm 11. That is, the width of the contact portion 13a of the idler arm 13 (width in the left-right direction of the seat bag) is equal to the width of the contact portion 13a of the idler arm 13.
The arm 11 is abutted so as to be movable in the left and right direction. The arm 11 is provided with flanges 11b and 11b' which are bent on the rear surface side along both edges in the width direction to prevent the idler arm 13 from falling off. A contact portion 13a of the idler arm 13 is provided.

A cam 16 for swinging the idler arm is disposed on the flange side of the idler arm 13, and the cam 16 is pivotally attached to a shaft 18 attached to one of the side frames 5 by a bracket 17. The shaft 18 is attached to the side frame 5.
protrudes outward from the seat back 1 through the hole 19.
An operating knob 3 is attached to the end thereof.

Both ends of the support spring 4 are fixed under tension to locking pieces 11a and 11a' that project from the inner edges of the tips of the arms 11 and 11', respectively, and swing integrally with the arms 11 and 11'. be done.

Next, the operation of the apparatus of this example configured as described above will be explained.

In FIG. 5, when the shaft 18 connected to the operation knob 3 is rotated in the direction of the arrow a, the cam 16 rotates eccentrically from the center of rotation and hits the surface that contacts the flange of the idler arm 13.
3 in several steps, and the rotation of the cam 16 causes the idler arm 13 to rotate around the pin 15 in the direction of arrow b, pressing one arm 11, which Rod 1
The rod 12 with the other arm 11' via 2
The shaft is rotated in the direction of arrow c with the shaft support as the center of rotation. Since a support spring 4 is stretched between the ends of both arms 11 and 11', this support spring 4 protrudes forward in accordance with each stage of the cam 16. Depending on the degree of forward protrusion of the support spring 4, the supporting force for the lumbar vertebrae of the seated person becomes stronger, pressing the lumbar vertebrae and reducing fatigue.

In addition, by rotating the operating knob 3 in the opposite direction, the support spring 4 is returned to its original position, thereby making the adjustment possible by weakening the supporting force of the lumbar vertebrae.

As described above, the lumbar support and adjustment device according to the present invention has many advantages over the conventional products as listed below.

(1) Since the idler arm is overlapped and abutted against the rear side of the arm, and both members are arranged in a substantially straight line, compared to the conventional product in which the idler arm and the arm are arranged side by side in the left-right direction, the support spring frame is The width dimension of the stretched left and right arms increases. Therefore, the width of the lumbar support device can be expanded compared to conventional products, so even larger occupants can use it comfortably.

(2) Since the idler arm and the arm are in surface contact and the contact surface is also located approximately in the center of both members, there is less wear on the contact surfaces as in the conventional products.
In addition, since only specific parts are not worn out, operation can always be performed smoothly.

(3) Since the width of the contact part of the idler arm is narrower than that of the arm, malfunction will occur even if the arm is deformed or the dimensions between the left and right arms are not formed to the specified dimensions. I never get used to it.

(4) Flanges are provided on both side edges of the part of the arm where the idler arm comes into contact, so these flanges reinforce the arm itself, which is subject to a load, and at the same time ensure the engagement between the idler arm and the arm. Even if the seat is tilted in the left-right direction due to a large load, the engaged state of both can be maintained.

(5) Furthermore, during operation, since the idler arm is in direct contact with the arm, a pressing force is directly applied from the idler arm to the arm, and the support spring can be reliably pushed out. Further, when the support spring is returned, the idler arm rotates in a direction away from the arm, so both arms rotate smoothly, resulting in good operability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the appearance of a seat with the lumbar support device of the present invention attached, FIG. 2 is a perspective view showing the configuration of the device of the present invention, and FIG. 3 is a perspective view of a part of the device of the present invention.
Fig. 4 is an exploded perspective view of a part of the main parts of the device of the present invention, Fig. 5 is an enlarged side view of the main parts of the device of the invention, Fig. 6 is a front view thereof, and Fig. 7 is an enlarged sectional view of the main parts. It is. In the figure, 1 is a seat back, 4 is a support spring, 11 is an arm, 11b and 11b' are arm flanges, 13 is an idler arm, 13a is an abutting portion of the idler arm, and 16 is a cam.

Claims (1)

[Scope of utility model registration request] An idler arm is brought into contact with a cam that is rotated by an operation knob, and the arm, which is supported by a support spring, is swung back and forth through the idler arm.
In the lumbar support adjustment device for a seatback that adjusts the supporting force of the lumbar region using the support spring, the idler arm is overlapped and abutted on the rear side of the arm, and the seatback is adjusted in the left-right direction at the contact portion of the idler arm with the arm. The length is formed to be narrower than the width of the arm at the portion,
A lumbar support adjustment device for a seat back, characterized in that flanges protruding toward the rear surface are provided on both ends of the arm in the width direction.