JPS5840928Y2 - Seat cushion pressure adjustment mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cushion pressure adjustment mechanism for a seat of a vehicle or the like.

Adjusting the cushion pressure of a seat is particularly useful in automobile seats, and by adjusting the seat pressure and back pressure, fatigue when sitting for a long time can be reduced.

To date, various cushion pressure adjustment mechanisms have been developed, and one in particular that adjusts back pressure is an adjustment mechanism called a lumbar support. , there is one that moves this board back and forth.

In addition, to adjust the seating pressure, there is a mechanism that raises and lowers a plate-shaped or rectangular assembly called a seat plate suspended by a coil spring.

However, each of these mechanisms has a complicated structure and is difficult to assemble, requiring a lot of time and effort, so a seat equipped with a cushion pressure adjustment mechanism has to be quite expensive.

In addition, as a publicly known lumbar support,
The one described in Japanese Patent No. 12088 is known.

This is done by attaching one end of an elastic band-shaped body such as a rubber belt or S spring to one side of the back frame and attaching the other end to a sliding member, and then attaching this sliding member to the other side of the back frame and rotating the It has a structure that is screwed onto a rod.

In this known example, the tension of the elastic band is strengthened or weakened by rotating the threaded rod and sliding the sliding member along the axial direction of the threaded rod, thereby supporting the lumbar vertebrae. I'm trying to make it stronger and weaker.

Disadvantages of known examples with such a structure are: - When a seated person leans their back against the back seat, that is, when a load is applied to the back seat, the center part of the elastic band is the strongest. When force is applied and in this state, when you try to pull the elastic band by rotating the control rod and sliding the sliding member, only the vicinity of the end attached to the sliding member is pulled, and the center pressed by your back is pulled. The disadvantage is that the parts do not change and are difficult to operate.

Of course, if you keep your back away from the back seat during operation, the above-mentioned problem will not occur, but in this case, you have to adjust the tension of the elastic band based on your intuition, and then put your back against it and check whether the tension is optimal for the seated person. It was tedious because I had to repeatedly test the tension, and if it didn't feel right, I'd have to put my back up again and adjust the tension based on my intuition.

Furthermore, when this structure was applied to the seat, the seat was subject to a larger load, so the operability was extremely poor and accurate adjustment was extremely difficult.

■Furthermore, even if a plurality of elastic strips are stretched in parallel on a frame, good cushioning can be achieved. Since the mechanism for imparting strength and weakness occupies a certain space following the end of the strip, the area where this mechanism is present cannot be a good cushioning area.

This idea was devised in view of the above circumstances, and has an extremely simple structure, low manufacturing cost, excellent operability, and high adjustment accuracy.
That is, it is an object of the present invention to provide a cushion pressure adjustment mechanism for a seat that can exhibit good cushioning properties even at the edge portions.

An embodiment of the present invention will be described below with reference to the drawings. Three groups of spring members are stretched between both sides 1a and 1b (2a, 2b) of the cushion frame 1, the back frame 2, or both frames 1 and 2. There is.

In the drawing, the spring members 3 are located on both sides 2a of the back frame 2.

Although only one wire is shown between 2b and is shown larger than it actually is, in reality, a plurality of wires are provided between both sides 2a and 2b.

The embodiment shown in FIG. 1 is designed to adjust the back pressure, and an operating member 4 is associated with one end of a coil spring used as a spring member 3.

That is, the rotating shaft 5 constituting the operating member 4 is connected to the frame 2.
It is rotatably attached to one side 2a, and its tip is inserted into the coil of the spring member 3, and the spring member 3 of the rotating shaft 5
A cam 6 is fixed to the distal end side inserted into the coil, and a knob 7 is fixed to the base end of the rotating shaft 5.

The cam 6 is located between the coils of the spring member 3, and the cam 6 rotates along the helical groove of the coil spring.

Therefore, when the cam 6 is rotated, the rotating shaft 5 and the cam 6 only rotate at a fixed position, so the spring member 3 is pulled toward or sent out to either one.

To explain this based on FIG. 3 a, l), the distance l between one side 2a of the back frame 2 and the cam 6 is unchanged;
When the number of coils of the spring member 3 located between the length of this distance l increases (see Figure 3), the coils of the spring member 3 located between the length of the distance between the cam 6 and the other side 2b increase. The number decreases, the spring constant of the spring member 3 increases during the distance, and the sheet in this area becomes stiff.

In the embodiment, reference numeral 8 is a stopper plate inserted in the middle of the spring member 3, and when the cam 6 collides with this stopper plate 8, the cam 6 cannot pull the coil any further.

The spring material 3 of the cushion frame has a structure in which a drainboard-like member 10 is suspended from both sides by coil springs 11, and the cushion material 9 is placed on top of the spring material 3.

Therefore, it goes without saying that this coil spring 11 may be operated by the aforementioned operating member 4 to change the spring constant.

Moreover, the number of the spring members 3 may be plural.

As explained above, according to the present invention, a group of spring members is stretched between both sides of a back frame, between both sides of a cushion frame, or between both sides of both frames, and an operating member is attached to at least one side of the frame, The tip of the operating member is attached to at least one end of one or more of the spring member groups, and the spring constant is changed by tensioning the spring member by operating the operating member, resulting in an extremely simple mechanism. , the installation work on the frame becomes easier,
It becomes possible to achieve significant cost reductions.

Furthermore, the strength of the cushion pressure can be adjusted simply by the tension of the spring member, making the adjustment easy and the operation smooth.

Furthermore, the present invention uses a coil spring as a spring member, and fixes both ends of the coil spring to the frame.
A rotating shaft inserted into the coil spring from one end is rotatably attached to the frame, and a cam is fixed to the tip of the rotating shaft inserted into the coil spring so as to be sandwiched between the coils of the coil spring. Since the cam and the rotating shaft constitute the operating member, most of the operating member is set within the coil spring, and no portion of the seat with poor cushioning properties is created.

Also, instead of pulling one end of the coil spring,
Since the cam between the coils rotates along the spiral groove, operability is improved and the spring constant can be reliably changed even while seated.

Furthermore, the present invention does not change the spring constant by pulling the end of the coil spring, but changes the number of coils of the coil spring between both sides of the frame, and at any position between both ends of the frame. It is also possible to keep the spring constant of the coil spring constant.

In other words, it is possible to provide uniform tension pressure without being soft at the center and hard at the ends, which is the case in the past.

In addition, since the adjustment range of the spring constant can be changed by changing the position of the stopper plate attached to the coil spring, the seat type (for example, sports cars and general cars), the seats of sports cars are harder.

) to regulate the adjustment width and make a harder (softer) seat, which is convenient.

[Brief explanation of the drawing]

Figure 1 is a perspective view, Figure 2 is a perspective view of the main parts, Figure 3 a, l
) is a schematic cross-sectional view showing the operating state. 1... Cushion frame, 2... Back frame, 3... Spring member, 4...
- Operating member, 6...cam, 8...stopper plate.

Claims (1)

[Claims for Utility Model Registration] (a) A group of spring members is stretched between the back frame or cushion frame of the seat or both sides of both frames,
An operating member is attached to at least one side of the frame, a tip of the operating member is attached to at least one end side of one or more of the spring members, and the spring constant is changed by pulling the spring member by operating the operating member. (b) using a coil spring as the spring member;
Both ends of the coil spring are fixed to the frame, (c) a rotating shaft inserted into this coil spring from one end is rotatably attached to the frame, and (d) a rotating shaft inserted into this coil spring is attached to the tip of the rotating shaft. A cam is fixed between the coils of a coil spring, (e) the cam and the rotating shaft constitute an operating member, and (f) a stopper plate is attached to the middle part of the coil spring. Features a seat cushion pressure adjustment mechanism.