JPS6135090Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention provides a lumbar support member disposed on a seat bag of a seat, a longitudinal adjustment means for adjusting and moving the support member substantially in the longitudinal direction of the seat, and a lumbar support member arranged in a seat bag of a seat. The present invention relates to a lumbar support device having a vertical adjustment means for adjusting and moving a seat substantially in the vertical direction.

By adjusting the lumbar support member approximately in the front-rear direction and approximately in the vertical direction of the seat, the height position of the seat bag and cushion hardness that correspond to the lumbar region of the seated person can be adjusted to a desired state, and the seated person's Lumbar support devices of the above type that are capable of improving comfort are known from the prior art.
This device can be widely used in vehicle seats or other seats.

This type of conventional lumbar support device is configured such that its vertical adjustment means transmits the operating force of the operating handle to the lumbar support member through a link mechanism assembled with a large number of members, and operates the member almost vertically. This not only increases the cost, but also increases the total frictional force acting between each member, which may increase the operating force applied to the operating handle.

Object The object of the present invention is to provide a lumbar support device of the type mentioned at the outset, in which the above-mentioned conventional drawbacks are eliminated by a simple construction.

Configuration In order to achieve the above object, the present invention has a vertical adjustment means that includes a sliding member that is movably supported in a substantially vertical direction on a bracket fixed to a frame of a seat bag, and a sliding member that is biased by a spring. A vertical cam that presses against the moving member and operates the sliding member approximately vertically by its rotation, and a rotating cam that is connected to the vertical cam via a connecting rod that is rotatably supported by the bracket. The operation handle is connected to the sliding member so as to be movable substantially in the vertical direction together with the sliding member, and transmits the operation of the sliding member due to the rotation of the vertical cam to the lumbar support member to operate the member substantially in the vertical direction. We propose a configuration comprising a transmission member that allows

Function According to the above configuration, the operating force applied to the operating handle is directly transmitted to the transmission member by the vertical cam, and the lumbar support member is operated substantially in the vertical direction.

Embodiments Hereinafter, advantageous embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a vehicle seat 1 as an example of a seat to which the present invention can be applied. As is clear from FIG. 1, the seat 1 has a seating area 2 and a seat bag 3.
This seat bag 3 is provided with a lumbar support device 5 according to the present invention. The illustrated lumbar support device 5 is a seat bag 3.
It has a plate-shaped lumbar support member 6 arranged so as to be adjustable and movable, and an adjusting means 7 for adjusting the position of this support member 6. It is located near the lower back of the body.

The adjusting means 7 includes a longitudinal adjusting means for adjusting the lumbar support member 6 in the longitudinal direction A of the seat 1, and a vertical adjusting means for adjusting the lumbar support member 6 in the vertical direction B of the seat, and the details thereof will be explained below. .

In FIGS. 2 to 5, 8 is a bracket, and the bracket 8 has a flat base 9 and 2
It consists of two upper and lower flange parts 10 and 11, and an ear part 12 hanging downward from the upper flange part 10, and is generally formed in a C-shape as a whole. Such a bracket 8 is fixed to the frame 13 of the seat bag 3 as shown in FIG. Two concentric through holes 14 and 15 are bored in the base 9 and the ear 12 of the bracket 8, and a connecting rod configured as an internally hollow sleeve 16 is inserted into one of the through holes 14. . This sleeve 16 also extends through the frame 13 (FIG. 1) of the seat bag 3 and is rotatably supported by the frame 13 and the bracket 8.

As shown in FIGS. 2 to 4, the sleeve 16
A shaft 17 is inserted into the inside of the sleeve 16 so as to be rotatable and concentric with the sleeve 16. In this case, the tip of the shaft 17, that is, the shaft end located inside the frame 13, protrudes from the sleeve 16 and is rotatably supported in the through hole 15, and the other end of the shaft 17, that is, the shaft end located inside the frame 13. A front and rear operation handle 18 (hereinafter referred to as the first
(referred to as the handle) is firmly fixed. This first handle 18 is used when adjusting the lumbar support member 6 in the longitudinal direction A of the seat, as will be described later. Furthermore, a longitudinal cam 19 for adjusting the lumbar support member 6 in the longitudinal direction A is fixed to the tip region of the shaft 17. As shown in FIGS. 4 to 6, this cam 19 has first to third cam surfaces 2 that are substantially flat.
0, 21, and 22, and each transition portion of these cam surfaces is formed in a smooth arc shape.

On the other hand, as is clear from FIG. 5, a pin 23 is inserted into the upper and lower flange parts 10, 11 of the bracket 8 through holes formed therein, and the pin 23 is fixed to the flange parts 10, 11. There is. In FIGS. 1 to 3, 24 is a leaf spring, and this leaf spring has a curled portion 25, and first and second arm portions 26 and 27 extending in the shape of arms from this curled portion 25. The pin 23 is fitted into the curled portion 25. In this way, the plate 24 is movably supported substantially in the longitudinal direction of the seat. The tip of the first arm portion 26 of the plate flange 24 is pivoted to approximately the center of the lumbar support member 6, and the second arm portion 27 is in contact with the cam surface of the fore-and-aft cam 19 described above. In this case, the lumbar support member 6 is
Since the cushion of the seat bag 3, particularly the cushion spring 28 (FIG. 1) provided on the seat bag 3, is biased around the pin 23 in the clockwise direction in FIG.
is in pressure contact with the second arm portion 27 of the leaf spring 24.

Above, the configuration of the longitudinal adjustment means has been mainly explained, and next, its operation will be explained.

The lumbar support member 6 is adjusted in the longitudinal direction A between an initial position shown by a solid line in FIG. 2 and a terminal position shown by a two-dot chain line in FIG. When the lumbar support member 6 occupies its initial position, the first handle 18 occupies the initial position shown in broken lines in FIG. It is in contact with 27. At this time, cam 19
A stopper 29 (Fig. 6) protruding from the bracket 8 comes into contact with the lower end of the ear 30 (the third
4), the first handle 18 is prevented from being rotated clockwise in FIG. 4 beyond its initial position.

When the first handle 18 is rotated counterclockwise in FIG. 4 to the position shown by the dashed line in FIG. 4, the front and rear cams 19 are also rotated and the second cam surface 21 is Second arm portion 2 of spring 24
7. Next, when the first handle 18 is further rotated and brought to the terminal position shown by the two-dot chain line in FIG. 4, the third cam surface 22 of the cam 19 comes into pressure contact with the second arm portion 27. In this case, as shown in FIG. 6, from the rotation center of the cam 19,
Distances d ₁ , d ₂ , d ₃ to each cam surface 20, 21, 22
is set to d ₁ < d ₂ < d ₃ , so as the cam 19 rotates, the second arm portion 27 of the leaf spring 24 moves in the direction of arrow C in the approximately longitudinal direction of the seat (FIG. 2). Pressed by Along with this, the first arm portion 26 is sequentially rotated in the counterclockwise direction in FIG. Move to the end position. As the lumbar support member 6 moves from its initial position to its end position, it will protrude in the forward direction of the seat, and thus the cushion stiffness of the seat bag 3 (FIG. 1) will gradually become harder. .

When the first handle 18 is rotated in the opposite direction, the lumbar support member 6 is returned to its initial position by the pressing action from the seat bag 3, and the cushion hardness of the seat bag 3 becomes soft again. In this way, by rotating the first handle 18 in a desired direction, the seated person can adjust the firmness of the seat bag in his/her lumbar region to a desired level. As can be seen from the above description, the leaf spring 24 functions as a transmission member that transmits the movement of the front and rear cams 19 to the lumbar support member 6.

Next, the detailed configuration of the vertical adjustment means will be explained.

2 to 4, a vertical cam 31 for operating the lumbar support member 6 in the vertical direction B is fixed to one end of the sleeve 16 described above, that is, the end located inside the frame 13. As shown in FIG. 7, this cam 31 also has first to third cam surfaces 32, 3 formed in a substantially flat shape.
3 and 34, and the transition portion of each cam surface is formed in a rounded arc shape. In this case, each cam surface 32, 33, 34 from the rotation center of the vertical cam 31
The distances D ₁ , D ₂ , and D ₃ are set to D ₃ >D ₁ >D ₂ . A vertical operation handle 4 (hereinafter referred to as a second handle) is fixedly connected to the other end of the sleeve 16, that is, the end located outside the frame 13 (FIG. 1).

On the other hand, a sliding member 35 formed in a substantially C-shape is arranged inside the bracket 8, as clearly shown in FIG. Holes 38 and 39 are formed, and the aforementioned pin 23 is inserted into these holes. The sliding member 35 is slidable relative to the pin 23 in its axial direction, that is, substantially in the vertical direction. In this manner, the sliding member 35 is supported by the bracket 8 via the pin 23 so as to be movable substantially in the vertical direction. Further, the base 40 of the sliding member 35 is provided with a long hole 41 extending substantially in the vertical direction, and the sleeve 16 is loosely fitted into the long hole 41. The curled portion 25 of the leaf spring 24 and its vicinity are sandwiched between the upper and lower flange portions 36 and 37 of the sliding member 35, and the sliding member 35 and the leaf spring 24 move integrally in the vertical direction. are connected so that they can be

A pin 2 is provided between the lower flange portion 37 of the sliding member 35 and the lower flange portion 11 of the bracket 8.
A compression spring 42 wound around 3 is provided,
The compression spring 42 presses the sliding member 35 upward, so that the cam surface of the vertical cam 31 comes into pressure contact with the upper surface of the lower flange portion 37 of the sliding member 35.

The lumbar support member 6 is vertically moved by rotation of the vertical cam 31 between an intermediate position shown by a solid line in FIG. 3, an upper end position shown by a two-dot chain line, and a lower end position shown by a one-dot chain line.

When the lumbar support member 6 occupies the intermediate position, the first cam surface 32 of the vertical cam 31 is pressed against the lower flange portion 37 of the sliding member 35, and at this time, the second handle 4 is moved as shown in FIG. It is stationary at an intermediate position indicated by a broken line.

When the second handle 4 is rotated clockwise in FIG. 4 from its intermediate position and brought to the terminal position shown by the two-dot chain line, the vertical cam 31 also rotates.
The second cam surface 33 is pressed against the lower flange portion 37 of the sliding member 35. At that time, the distances D ₁ and D ₂ from the center of the cam 31 to each cam surface 32, 33 are as follows:
Since D ₁ > D ₂ is set, the second handle 4
As the slide member 35 rotates from the intermediate position to the end position, the sliding member 35 is pressed upwardly by the compression spring 42, and the member 35 reaches the upper end position shown schematically in FIG. Along with this, the lumbar support member is also brought to the upper end position shown by the two-dot chain line in FIG. In this way, the operation of the sliding member is transmitted to the lumbar support member 6 by the leaf spring 24.

When the second handle 4 is now rotated counterclockwise from the end position shown by the two-dot chain line and returned to the intermediate position shown by the broken line, the lumbar support member 6 also returns to the intermediate position. Then, when the second handle 4 is further rotated counterclockwise in FIG. 4 and brought to the other end position shown by the dashed line, the third cam surface 34 of the up-down cam 31 moves against the sliding member. The lower flange portion 37 of 35 is pressed against the lower flange portion 37 of 35 . At that time, as mentioned above,
Since the distance D ₃ is even longer than D ₁ , when the second handle 4 reaches the terminal position shown by the dashed line, the sliding member 35 and the lumbar support member 6 are connected to the compression spring 42 .
against the spring force, it moves to the lower end position shown by the dashed line in FIG.

As described above, the operator rotates the second handle 4 in a desired direction to bring the lumbar support member 6 to the desired vertical position, and adjusts the first handle 18 as appropriate.
Adjust the longitudinal position of the lumbar support member 6 brought to the desired vertical position, and then move the seat bag 3
The stiffness of the cushion can be adjusted as desired. In addition, in the configuration of the specific example described above, in order to adjust the position of the lumbar support member,
When operating the first and first handles 18, 4,
Each cam surface 20, 21, 22 of cam 19, 31: 3
2, 33, and 34 sequentially come into contact with the second arm portion 27 of the leaf spring 24 or the lower flange portion 37 of the sliding member 35, so that a so-called sense of moderation can be given to the operator, which is pleasant to the operator. You can perform operations.

Although the advantageous embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be modified in various ways. For example, in the above embodiment, the leaf spring 2 has the first arm portion 26 and the second arm portion 27.
4 was used, but as shown in FIG.
It can also be brought into pressure contact with a single arm portion 26 of. In FIG. 8, the leaf spring 24 is made up of two parts, which are integrally fixedly connected, but a leaf spring made of one member without the second arm part may also be used. Of course. Furthermore, if a leaf spring 24 as shown in FIG. Although it is advantageous that a relatively large force can be transmitted and the cost can be kept low, it is preferable to use a suitable member such as a torsion coil spring, a lever, a rod-shaped member, or a combination of these members as the transmitting member. You can also do it. Furthermore, as in the illustrated embodiment, if the movement of the sliding member and the front and rear cams is transmitted to the lumbar support member by one transmission member, the structure can be simplified and it is particularly advantageous. It is also possible to transmit the movement and the movement of the front and rear cams by separate transmission members. In addition, in the illustrated embodiment, the three cam surfaces of each cam 19, 31 are used to adjust the lumbar support member in three steps up and down and back and forth, but this can be adjusted in two or four steps or more. Of course, it can be configured to move. Furthermore, it is advantageous to form the connecting rod as a sleeve 16 and insert the shaft 17 into it as in the illustrated embodiment, since the structure can be made particularly compact.

Effects According to the present invention, since the sliding member of the vertical adjustment means is operated by the vertical cam, it is possible not only to simplify the structure and reduce costs, but also to reduce the distance between each member constituting the vertical adjustment means. The total amount of frictional force can be reduced, making it possible to easily operate the operating handle with little force.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view showing how the lumbar support device is attached to the seat, Fig. 2 is a sectional view taken along the - line of the lumbar support device shown in Fig. 3, and Fig. The front view of Fig. 2 shows the mounting position of the second handle in a different state from Fig. 2 and is represented by chain lines, and Fig. 4 shows the first and second handles removed, and these are indicated by dashed lines and dashed lines, respectively. Side view of Figure 3 shown, No. 5
The figure is an exploded perspective view showing only some components of the lumbar support device, Figure 6 is a front view of the front and rear cams, Figure 7 is a front view of the upper and lower cams, and Figure 8 is another embodiment of the leaf spring. FIG. 3 is a partial cross-sectional view showing an example. 1... Seat, 3... Seat bag, 4,18
... Handle, 5 ... Lumbar support device, 6
... Lumbar support member, 8 ... Bracket,
13...Frame, 16...Sleeve, 17...
Shaft, 19, 31...Cam, 24...Plate spring, 35
...Sliding member, 42...Spring, A...Anteroposterior direction,
B... Vertical direction.

Claims (1)

[Claims for Utility Model Registration] (1) A lumbar support member disposed on the seat bag of the seat, a longitudinal adjustment means for adjusting and moving the support member approximately in the longitudinal direction of the seat, and a lumbar support member disposed on the seat bag of the seat; A lumbar support device having a vertical adjustment means for adjusting and moving the seat bag in a substantially vertical direction, wherein the vertical adjustment means is a sliding member supported by a bracket fixed to a frame of a seat bag so as to be movable in a substantially vertical direction; A vertical cam presses against a sliding member biased by a spring and operates the sliding member almost vertically by its rotation, and a connecting rod rotatably supported by the bracket allows the vertical movement to be performed. an operation handle for rotating the cam connected to the cam; and an operation handle connected to the sliding member so as to be movable in a substantially vertical direction together with the sliding member;
The lumbar support device is characterized by comprising a transmission member that transmits the operation of the sliding member due to the rotation of the vertical cam to the lumbar support member and operates the member substantially in the vertical direction. (2) The longitudinal adjustment means includes a shaft rotatably supported by the bracket, a longitudinal cam fixed to the shaft, and a cam rotation operation handle connected to the longitudinal cam via the shaft. and the transmission member, the transmission member is supported so as to be movable approximately in the longitudinal direction of the seat, and the transmission member is actuated approximately in the longitudinal direction of the seat by rotation of the front and rear cam, and this operation acts as a lumbar support. The lumbar support device according to claim 1, which is a registered utility model, wherein the front and rear cams are pressed into contact with the transmission member so as to be transmitted. (3) The lumbar support device according to claim 1 or 2, wherein the transmission member comprises a leaf spring connected to the lumbar support member and a bracket. (4) The scope of the utility model registration claim, wherein the connecting rod rotatably supported by the bracket is formed as an internally hollow sleeve, and the shaft that fixedly supports the front and rear cams is inserted concentrically into the sleeve. The lumbar support device according to any one of Items 1 to 3.