JPS6212350Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a lumbar support device that is attached to the backrest of a seat in a vehicle such as an automobile, and supports the lumbar region of a seated person so as to stretch the back and push the lumbar region forward.

In recent years, the above-mentioned lumbar support devices have been widely used in the backrests of automobile seats. This device has a belt-shaped support material placed horizontally inside the backrest.
The tension of the support material can be adjusted quickly or slowly by operating a dial or the like by the seated person. However, with conventional devices, only one support material is installed horizontally at one location within the backrest, and the supporting force (degree of overhang) that pushes the lumbar region of the seated person forward can be variably adjusted. The support position cannot be changed up or down, and for this reason, only a certain part near the lumbar region of the seated person can be supported at any given time. There was a problem in that the support position had to be changed, and there was also a problem in that it was often inappropriate for people with large or small builds because there was no support position at a height that suited them.

Therefore, in order to solve the above-mentioned conventional problems, it is possible to adjust the supporting force by slowly and quickly operating the band-shaped support material, and it is also possible to support the seated person at different heights depending on the seated person's choice. In an attempt to obtain a lumbar support device that is convenient and eliminates the inconvenience caused by differences in body physique, a pair of band-shaped support materials are placed horizontally across the width of the backrest of the seat in two rows, one above the other. We thought of selectively adjusting the tension of both the upper and lower support materials, but we were unable to find a suitable tension adjustment method for selectively adjusting the tension of both the upper and lower support materials, and it was not possible to put it into practical use. However, it was quite difficult to realize it.

This idea was devised in view of the above circumstances, and the tension state of both the upper and lower support materials can be adjusted arbitrarily with simple operations, and the structure is extremely simple and easy to manufacture and assemble. To provide a very practical lumbar support device which is excellent in durability and has no problems such as wear and tear of the support material even after long-term use.

In other words, the lumbar support device of this invention is
In order to achieve the above purpose, a pair of band-shaped support materials are placed horizontally across the width of the backrest of the seat of a vehicle, etc. in two rows, upper and lower, and each of the above-mentioned upper and lower supports is operated by the seated person. In a lumbar support device equipped with a tension adjustment mechanism that can selectively adjust the tension state of the material, the tension adjustment mechanism is rotatable around an axis substantially perpendicular to a frame on one side inside the backrest. It is attached and has a pair of upper and lower arcuate elongated holes penetrating the inner and outer surfaces along a circumference centered on the axis, and concave and convex surface portions are arranged adjacent to each other in the circumferential direction on the outer surface. a disc-shaped rotary cam, an operation dial for the seated person to rotate the rotary cam at appropriate angles from the outside of the backrest, and a distal end with a proximal end connected to one end of the upper and lower support members. A pair of upper and lower slide rods are inserted through the rotary cam so that their sides are slidably fitted into the upper and lower circular arc-shaped elongated holes, and a pair of upper and lower slide rods are rotatably attached to the tip ends of the upper and lower slide rods, respectively. The rotary cam is characterized in that it is configured to include rollers that roll into contact with concave and convex surfaces on the outer surface of the rotary cam.

By providing a tension adjustment mechanism with such a configuration, a single rotary cam rotates when the seated person rotates the operation dial, and the rotation of this rotary cam causes a pair of upper and lower holes that pass through the upper and lower arcuate long holes to rotate. The rollers on the tip side of the slide rods come into contact with the outer surface of the rotary cam, and ride on the convex surface or fall into the concave surface, and as a result, each of the upper and lower support members The tension state can be selectively adjusted according to the arrangement of the concave and convex portions. In addition, only one cam is required for the upper and lower support members, making the configuration extremely simple and easy to manufacture and assemble. There is no possibility of wear and tear due to direct sliding contact with the cam or other members in the middle, and it is extremely durable and can withstand long-term use.

An embodiment of this invention will be described below with reference to FIGS. 1 to 5. First, reference numeral 1 in FIG. 1 indicates a seat for a vehicle such as an automobile, which consists of a seat 2 and a backrest 3. A lumbar support device 4 of this invention is attached to the backrest 3.

Here, this lumbar support device 4 is shown in FIG.
In the configuration as shown in FIG. 3, a pair of band-shaped support members 7 and 8 are arranged horizontally in parallel in two stages, upper and lower, between internal frames 5 and 6 of the backrest. Here, one end of the pair of upper and lower supports 7, 8 is fixed via a pin 10 to a U-shaped bracket 9 fixed to the frame 5 on one side. The other end is supported by a tension adjustment mechanism 11 so that the tension state can be selectively adjusted by dial operation by the seated person. The tension adjustment mechanism 11 includes a hat-shaped bracket 12 fixed to the frame 6 at the other end,
A disc-shaped rotating cam 13 is rotatably supported between the bracket 12 and the frame 6 through bearing holes 12a and 6a, respectively, and this rotating cam 13
A compression coil spring 15 is interposed on the outer periphery of the central rotating shaft 14 of the rotating shaft 14 and a protruding portion of the rotating shaft 14 that protrudes outward from the bearing hole 6a of the frame 6, so that the rotating shaft 14 is always pressed outwardly, and is prevented from rotating by a detent pin 16. a rotational positioning plate 17 provided in a state where The rotating cam 1 is fixed to the rotating cam 1 through the upper and lower small holes 12b, 12b of the bracket 12.
Upper and lower slide rods 19, 19 are slidably inserted into a pair of arcuate long holes 13a, 13a provided in 3.
and a pair of rollers 21, 21 and 22, 22 attached to the tips of the upper and lower slide rods 19, 19 via pin shafts 20, 20 orthogonal thereto. The rotary cam 13 is a type of three-dimensional cam, and has a function similar to an end cam. In other words, the rotary cam 13 has a disc shape and is vertically symmetrical about the rotation axis 14. Arc-shaped long holes 13a, 13a are formed in the holes 13a, 13a, and rollers 2 at the tips of the upper and lower slide rods 19, 19 that slide into the long holes 13a, 13a.
Concave and convex surface portions 13b and 13c are formed by changing the wall thickness on the outer surface where 1, 21 and 22, 22 contact each other. The position of the concave portion 13b is shown in FIG.
As shown in FIG. 5, the upper and lower arcuate long holes 13a, 13a
The upper concave portion 13b is placed closer to the clockwise end of the upper elongated hole 13a, and the lower concave portion 13b is placed closer to the counterclockwise end of the lower elongated hole 13a. However, all other parts are convex portions 13c, and the convex portions 13c
and the concave surface portion 13b are smoothly connected by an inclined surface 13d. Further, as shown in FIG. 3, the rotary positioning plate 17 has three positioning holes on the same circumference, three on the top and three on the top at appropriate intervals.
7a, 17b, 17c are formed, and a pair of upper and lower small protrusions 18 are formed on the back surface of the operation dial 18.
a, 18a are provided as shown in FIG.
b, 17b or 17c, 17c.

If the lumbar support device 4 having the above-described configuration is provided on the backrest 3 of the seat 1, the seated person can rotate the operation dial 18 to
The rotating cam 13 rotates together with this via the rotating shaft 14. For example, when the dial 18 is rotated clockwise, that is, when the small protrusions 18a, 18a engage with the positioning holes 17c, 17c,
The rotating cams 13 rotate in the same clockwise direction, and the upper rollers 21, 21 roll into contact with the convex surface portion 13c, and the lower roller rolls into contact with the concave surface portion 13b so as to drop down, thereby making the upper support member 7 strong. The lower support member 8 becomes tensioned and supports the seated person's back to push it out, and the lower support member 8 becomes less tensioned and loses its force to support the seated person. If the dial 18 is rotated counterclockwise, the tension on the upper support 7 will be loosened, and the lower support 8 will be strongly stretched out.
When 8 is returned to the neutral position, both upper and lower support members 7 and 8
Both of them become in a strong tension state and come to support the seated person's back widely from top to bottom.

6 and 7 show a modification of this invention, and the rotary cam 23 shown here has a pair of upper and lower arcuate elongated holes 23a, 23a as in FIG. 4, and the upper elongated hole 23a. A wide concave portion 23b is provided near the end in the counterclockwise direction, and slightly narrow concave portions 23b', 2 are provided near both ends of the lower elongated hole 23a.
3b', and all other parts are convex portions 23c.The one shown in FIG. 4 can be set in three positions, but in this modified example, four positions can be obtained. Although not shown, a rotary positioning plate may be configured correspondingly to the rotary cam 23, and other than that, it may be completely the same as in the above embodiment.

When this rotary cam 23 is used, it is possible to alternately put the upper and lower support members in a strong tension state one by one, or to put both in a strong tension state, by operating a dial, as in the above embodiment, and furthermore, it is possible to make both the upper and lower support members into a strong tension state. It is possible to loosen the tension.

8 and 9 show another embodiment of this invention, in which the other ends of the upper and lower support members 7, 8 are supported by a tension adjustment mechanism 11 similar to the previous embodiment, and their In addition to making it possible to selectively adjust the tension state, one end side of the upper and lower support members 7 and 8 is also structured so that the tension can be adjusted without being fixed. A tension adjustment mechanism 24 is provided. This mechanism 2
Reference numeral 4 denotes a screw rod 26 directly connected to the dial 25, a nut 27 that is screwed into the screw rod 26 and moves back and forth by the screw feeding action, vertical projecting pins 28, 28 integrated with the nut 27, and a U-shaped bracket fixed to the frame 5. It consists of a pair of upper and lower rotating arms 31, 31 whose base ends are rotatably connected to 29 via a pin 30, and the upper and lower protruding pins 28 of the nut 27 are located in the middle of each of the vertically moving arms 31, 31. , 28 are connected to each other, and one end of the vertical support members 7, 8 is connected to a pin 32 provided between the distal ends of the vertically movable arms 31, 31, respectively.

In this embodiment, as in the above-mentioned embodiment, the upper and lower support members 7 and 8 can be selectively switched to a slow or fast tension state. By making the tension even stronger, or conversely making it slightly weaker, or further loosening the loose tension, it becomes possible to more accurately match the preferences of the seated person.

This invention has been developed as detailed above, and as the strength of the support force on the seated person can be adjusted by adjusting the speed of the belt-like support material, the seated person can select support at different positions of height, which is very convenient for the seated person and also eliminates inconveniences caused by differences in physique. Moreover, the structure is very simple and easy to manufacture.
The lumbar support device is very practical because it is easy to assemble and has excellent durability, and there is no problem such as wear of the support material even after long-term use.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of this invention, in which Figure 1 is a perspective view of the device installed in a seat in use, Figure 2 is a front view of only the device of this invention, and Figure 3 is a perspective view of the device in use. The figure is an exploded perspective view of the main parts, Figure 4 is an outer side view of the rotary cam, Figure 5 is a sectional view taken along line V-V in Figure 4, and Figure 6 is a rotary cam showing a modification of this invention. 7a and 7b are sectional views taken along lines AA and BB in FIG. 6, FIG. 8 is a front view showing another embodiment of this invention, and FIG. 9 is an enlarged plan view of the main part of FIG. 8; 1...seat seat, 2...seat, 3...backrest,
4... Lumbar support device, 5, 6... Frame, 7, 8... Upper and lower support material, 9... Bracket, 10... Pin, 11... Tension adjustment mechanism, 12
... Bracket, 13, 23 ... Rotating cam, 13
a, 23a...Circular long hole, 13b, 23b, 2
3b'...Concave surface part, 13c, 23c...Convex surface part, 1
3d... Slope portion, 14... Rotating shaft, 15... Compression coil spring, 16... Rotation stop pin, 17... Rotation positioning plate, 17a, 17b, 17c... Positioning hole, 18... Dial, 18a... ...small protrusions,
19...Slide rod, 20...Pin shaft, 21,2
2... Roller, 24... Stepless tension adjustment mechanism, 25
...Dial, 26...Screw rod, 27...Nut, 28...Protruding pin, 29...Bracket, 3
0...Pin, 31...Rotating arm, 32...Pin.

Claims (1)

[Scope of utility model registration request] A pair of belt-shaped support materials are placed horizontally across the width of the backrest of a seat in a vehicle, etc. in two rows, upper and lower, and the tension state of each of the upper and lower support materials can be selectively adjusted by an operation by a seated person. In a lumbar support device, the tension adjustment mechanism is mounted rotatably about an axis substantially perpendicular to a frame on one side inside the backrest, and the tension adjustment mechanism is mounted rotatably about an axis that is substantially orthogonal to a frame on one side of the interior of the backrest. A disc-shaped rotating disc having a pair of upper and lower arc-shaped elongated holes penetrating the inner and outer surfaces along the circumference, and having concave and convex surface portions arranged adjacent to each other in the circumferential direction on the outer surface. A cam, an operation dial for the seated person to rotate the rotary cam from the outside of the backrest at appropriate angles, and a base end connected to one end of the upper and lower support members, and a tip end connected to the upper and lower ends of the rotary cam. A pair of upper and lower slide rods are inserted through the arc-shaped long holes of the rotary cam, and a pair of upper and lower slide rods are rotatably supported on the tip ends of the upper and lower slide rods. A lumbar support device characterized by having a configuration consisting of rollers that make contact with concave and convex surfaces.