JPS5826603Y2 - Lumbar support device for automobile seats, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lumbar support device built into a seat, particularly an automobile seat.

When seated in a seat, pressure on the lumbar vertebrae allows the back muscles to stretch, improving posture and supporting the upper body more easily. Fatigue will be halved and driving will be more comfortable.

For this reason, conventionally, automobile seats have built-in lumbar support devices that contact the lumbar vertebrae in order to support the lumbar vertebrae, but these support devices simply support only the lumbar vertebrae and change the support pressure. Moreover, even those that support a wide surface relative to the back surface are only supported in a single manner, and the support pressure cannot be changed in some areas, so there is a drawback that the lumbar vertebrae cannot be supported reliably.

Therefore, in the present invention, the lumbar support device is configured to be able to support not only the lumbar vertebrae but also the back surface over a wider area and partially.

That is, in the present invention, a set of two arms are placed opposite each other on both sides on a shaft horizontally suspended at the lower part of the back frame of the seat, and a plurality of sets of arms are arranged with different lengths for each set. A spring is stretched between the arms, and means is provided for individually rotating and displacing each set of arms, and the rotation of the arms covers the entire lower half of the back seat via the spring, and also partially covers the lower half of the back seat via the spring. It is designed to bulge out to support the lumbar vertebrae.

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

FIG. 1 shows a seat S of an automobile, etc. In the figure, sb is a backrest portion of the seat S, Sc is a cushion portion of the seat S, and the device of the present invention is built into the lower half of the backrest portion sb.

Figure 2 shows the internal structure of the backrest part sb of the seat S.
In the figure, reference numeral 1 denotes a bank frame, which is made of metal tubing and is integrally and continuously formed into an upper frame portion 1a, both side frame portions 1b and 1c, and a lower frame portion 1d.

In the upper half of this bank frame 1, a spring 2 in the form of an eight-shaped line is stretched laterally as usual, and a lumbar support device A is installed in the lower half.

This lumbar support device A is constructed as described in detail below.

That is, in the lower half of the back frame 1, there are frame parts 1b on both sides.
, 1 c, and a lower frame part 1 d is fixed between the lower parts of the support plates 4 a t 4 b.
A main shaft 5 is rotatably mounted horizontally parallel to the main shaft 5, and an intermediate tubular shaft 6 and both-side tubular shafts 7a and 7b are rotatably fitted into this main shaft 5, and these both-side tubular shafts 7a and 7b are Pin 8
a and 8b are diametrically penetrated and locked, and rotated together via the main shaft 5.

Arms 9a and 9b are fixed to opposite ends of the intermediate tubular shaft 6, and arms 9a and 9b are fixed to both ends of the intermediate tubular shaft 6.
Arms 10a and 10b that are longer than a>9b are arm 9a,
They are located on the outside of the arms 9b and are fixed to face each other, and between the tips of the arms 9a, 9b and the arms 10a, 10b, there are hooks 11a, 11b and 12a, 12b, respectively, in the shape of an 8-shaped line. The springs 3a and 3b are stretched.

Further, a bearing 13 is installed through one of the support plates 4a near the pivot portion of the main shaft 5, and a cam shaft 16 has an inner shaft 14 and a tubular outer shaft 15 coupled to the bearing 13 in a biaxial manner. is inserted, both ends of the inner shaft 14 protrude from both sides of the outer shaft 15, and polygonal plate cams 17 and 18 are provided at the inner ends of the inner shaft 14 and the outer shaft 15, respectively, to connect the arms 9a and 10a. It is fixed so as to abut against the rear edge surface, and levers 19 and 20 are fixed to the outer ends, respectively.

A backrest portion sb is formed by disposing a cushion band on the front surface of the bank frame 1 constructed as described above in contact with the springs 2, 3a, 3b and covering the outer skin 21.

The above-mentioned levers 19 and 2 are attached to one side of this backrest portion sb.
0 is displayed.

By rotating the levers 19 and 20 forward (counterclockwise in the figure) as shown in FIG. and press 10a forward.

Due to the suppression, the arm 9a is rotated forward with the arm 9b via the intermediate tubular shaft 6, and the arm 10a is rotated forward with the arm 10b via the tubular shaft 7a, the main shaft 5, and the tubular shaft 7b. And the springs 3a and 3b stretched between 10a and 10b are pushed forward.

In this way, when levers 19 and 20 are rotated together, plate cams 17 and 18 are rotated together, and arm 9a
, 9b, 10a, and 10b forward (see Fig. 5A).
), the springs 3a and 3b are pushed out at the same time, and the lower half of the backrest sb is expanded over the entire area as shown by the dashed line in FIG. 5A. Pressed.

The above is a case where the levers 19 and 20 are rotated at the same time, but the levers 19 and 20 are rotated to one side, and the plate cam 1
7 and 18 can be displaced separately, and when only the lever 20 is rotated as shown in FIG. 5B, the arm 1
Only the upper spring 3b is pushed out and the upper part of the lower half of the backrest part sb is expanded, and the lever 19 is rotated forward by the plate cam 18.
When the arms 9a and 9b are rotated forward by the plate cam 17, only the lower spring 3a is pushed out, and only the lower side of the lower half of the backrest portion sb is bulged out.

That is, the lower half of the backrest portion sb can be partially bulged out.

In the above configuration, it goes without saying that the interlocking mechanism of the arm, the shape of the plate cam, its operating mechanism, etc. can be changed in many ways without departing from the gist of the present invention.

As described above, according to the present invention, the lower half of the backrest of the seat is bulged out over the entire surface and partially at the top and bottom of the lower half, and the bulge can be changed depending on the physique of the seated person. Since the expansion is performed by a spring stretched on the frame, it extends over almost the entire width of the backrest, ensuring reliable support for the lumbar vertebrae of the seated person.
In particular, if applied to the driver's seat of a car, it can reduce driver's fatigue and improve safe driving.

[Brief explanation of drawings]

Figure 1 is a perspective view of a seat for an automobile to which the present invention is applied;
FIG. 2 is a perspective view from the rear of a back frame equipped with the device of the present invention, FIG. 3 is an enlarged sectional view of the arm portion in FIG. 2, and FIG. 4 is an enlarged sectional view of the cam portion in FIG. 2. Fifth
The figure is a schematic side view of the backrest portion for explaining the operation of the device of the present invention. In the figure, 1 is a bank frame, 3a, 3b are springs, 5
9 is a main shaft, 9 a t 9 b, 10 a, and 10 b are arms, 16 is a cam shaft, 17 and 18 are plate cams, and 19.20 is a lever.

Claims (1)

[Scope of utility model registration request] A pair of inner arms whose lower ends are connected to each other and a spring is stretched between the upper ends, and a pair of outer arms whose lower ends are connected to each other and a spring is stretched between the upper ends and which are longer than the inner arms are attached to the lower part of the bank frame. A coaxial inner operating shaft and an outer operating shaft are pivotally supported on the bank frame, and one of the operating shafts has biasing means for rotating in correspondence with the inner arm, and the other has a biasing means corresponding to the outer arm. A lumbar support device for a seat of an automobile, etc., comprising fixed biasing means for rotating and rotating the lumbar vertebrae.