JPH061004Y2 - Lumbar support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a lumbar support device that provides a proper sitting comfort by supporting a lower back part of a seated person under a seat back, and in particular, operates the lumbar support device. The present invention relates to an improvement in a lumbar support device that uses an armrest that is axially supported so as to be housed in and retracted from the seat back side as an operating means.

[Conventional technology]

For vehicle seats, etc., while the vehicle is traveling, it stably holds the seated person and gives an appropriate sitting comfort.
Further, it is desired to be able to reduce fatigue as much as possible even in a seated state for a long time, and for this reason, a support device is attached to each part of the seat. The most well-known examples of such a support device are a side support for giving a seated person a hold feeling on both sides of the seat, and a lumbar support for supporting the lower back of the seated person from the seat back side.

As such a lumbar support device, conventionally, various ones having various configurations are known. For example, a lumbar plate provided so as to be movable in the seat back-and-forth direction in a seat back is rotationally operated in the seat back. In general, an apparatus configured to be driven by using an appropriate pressing unit such as a push unit that moves in the front-rear direction of the seat by a cam unit, a link mechanism, or the like is used.

[Problems to be solved by the device]

By the way, one of the problems in the lumbar support device having the above-described structure is the location of the operating means for operating the device from the outside. That is, a cam type is generally used as the simplest lumbar support device. However, in order to move the lumbar plate by turning the cam means provided in the seat back, the lumbar support device is turned to the side of the seat back. It is necessary to provide an operating lever.

However, in a vehicle seat or the like, the location where the above-described rotation operation lever is provided on the side portion of the seat back is restricted in the vehicle interior space, for example, another seat disposed adjacent to the seat or an appropriate seat. It is often restricted by the on-board equipment, passenger compartment door, etc., and in addition, armrests etc. are often provided on the side of the seat back,
The degree of freedom in design is low, and it is desired to take some measures in consideration of such points.

[Means for Solving the Problems]

In order to meet such a demand, the lumbar support device according to the present invention has a lumbar plate that is movably arranged in the seat back in the front-rear direction of the seat and bulges below the seat back. The lumbar drive mechanism is operated by a turning operation, and the seat back side is provided with an armrest pivotally supported by a turning shaft so that the armrest can be housed and pulled out. A portion corresponding to the turning shaft is provided outside the armrest. An operation button that can be pressed is provided, and a connecting means that is connected to the lumbar drive mechanism facing the inside of the seat back when the operation button is pressed is provided. Is configured to be movable.

Further, according to the present invention, in the above-mentioned configuration, when the operation button is pressed, the connection state of the connection means to the lumbar drive mechanism is temporarily retained, and the armrest is rotated by a certain amount to support the lumbar support. Locking means for returning the operation button when the lumbar support bulges, and a return member incorporated in the lumbar drive means for forcibly moving the lumbar plate to the rear of the seat when the operation button is pressed when the lumbar support bulges. The spring means and the spring means are selectively attached.

[Action]

According to the present invention, the lumbar support can be moved by the drive mechanism to be bulged by pressing the operation button on the outside of the armrest and rotating the armrest, and the return spring means is additionally provided. Since the operation button can be interlocked with, the operation of releasing the lumbar support can be easily and appropriately performed by pressing the operation button.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

1 to 4 (a) and (b) show an embodiment of a lumbar support device according to the present invention. In these drawings, a vehicle seat denoted by reference numeral 1 is shown in FIG. As is apparent from (b), the seat cushion 2 and the seat back 3 which is erected on the rear end portion and has the headrest 3a at the upper end portion are provided. Armrest 4 used as an armrest
This seat back 3 is pivotally supported so it can be pulled out.
As shown in FIG. 1, a lumbar support device 10 is provided below the inside of the lumbar plate 11 and a lumbar drive mechanism 1 for moving the lumbar plate 11 in the seat longitudinal direction.
2 are provided. Here, in the present embodiment, as the lumbar drive mechanism 12, a case is used in which the cam member 13 and the link 14 that presses and moves the lumbar plate 11 by being rotated by the cam member 13 are used. Further, in FIG. 1, 15 is a seat back frame, 16
Is its side bracket, this side bracket 16
The pivot shaft 17 of the armrest 4 is rotatably supported. In the figure, 18 and 18 are side brackets 16,
A support stay of the lumbar plate 11 rotatably supported by 16 and a frame 4a of the armrest 4 in FIG.

Now, according to the present invention, in the above-mentioned lumbar support device 10, as an operating means for rotating the cam member 13 in the lumbar drive mechanism 12, FIGS. 1 to 4 (a), (b) As is clear from the above, the armrest 4 is characterized in that it can be skillfully used. That is, according to the present invention, the operation button 20 that can be pressed from the outside is provided on the outer side of the armrest 4 corresponding to the rotary shaft 17, and the operation button 20 is provided.
When the pressing operation is performed, the cam shaft 2 of the cam member 13 on the side of the lumbar drive mechanism 12 faces the inside of the seat back 3.
As a connecting means to be selectively connected to 1, the engagement pin 2 is provided on the camshaft 21 side, as is apparent from FIGS. 2 and 3.
2 is provided with a notch 23 on the armrest rotating shaft 17 side,
By pressing the operation button 20, the rotary shaft 17 is moved to the seat back 3
The lumber plate 11 is configured to be pushed in, engaged and connected to each other, whereby the lumbar plate 11 can be moved as the armrest 4 rotates. However, the present invention is not limited to this, and it is free to use an appropriate connecting means. In FIG. 2, reference numeral 24 is a transmission shaft interposed between the operation button 20 and the rotary shaft 17 for transmitting the pressing operation force, and 25 is a coil spring for returning the operation button 20.

According to such a configuration, despite the simple and inexpensive configuration, the armrest 4 provided on the side portion of the seatback 3 is provided.
4 (a), the armrest 4 is rotated while pressing the operation button 20 on the outside of the armrest 4 skillfully.
As is apparent from (b), the lumbar plate 11 of the lumbar support device 10 can be appropriately and surely expanded by moving it via the drive mechanism 12. Of course, if the armrest 4 is rotated without operating the operation button 20, the lumbar support device 10 will not operate. In addition, in the present embodiment, the stepped lumbar support using the cam member 13 is illustrated, but it is free to adopt a stepless configuration. And according to such a configuration,
Not only can the conventional problem of having trouble with the location of the operating means eliminated, but the operating force can be reduced by replacing the operating knob with an armrest, which is excellent in terms of operability and has a good appearance. There are advantages such as a configuration.

FIGS. 5 (a), (b) to 7 (a), (b), (c) show another embodiment of the present invention. In this embodiment, the operation button 20
When the button is pressed, the state of connection by the connecting means to the lumbar drive mechanism 12 is temporarily retained, and the operation button 20 is returned when the armrest 4 is rotated by a certain amount and the lumbar support is expanded. As a means, an engaging disc 30 having an engaging projection 30a is provided on the rotary shaft 17 of the armrest 4, and two engaging discs which can be engaged with the engaging disc 30 at at least two positions in the rotational direction. By engaging hole 31 having notches 31a and 31b in side bracket 16 and pressing operation button 20 with one touch and rotating arm rest 4, engaging disk 30 is formed.
Are locked on the inner surface side of the bracket 16.
With such a configuration, the problem of operability of rotating the armrest 4 while pressing the operation button 20 as in the above-described embodiment can be further simplified. Further, when the armrest 4 is rotated by a certain angle, the engaging protrusion 30a of the engaging disc 30 reaches a position corresponding to the engaging notch portions 31a to 31b of the engaging hole 31, whereby the coil spring 25 causes the coil spring 25 to move. The operation button 20 returns to the protruding state. The steps of pressing the operation button 20 and rotating the armrest 4 are shown in FIGS. 7 (a), (b), and (c). First, the operation button 20 is pressed to operate the armrest 4
The state of rotating is shown in the same figure (a), while rotating is shown in the same figure (b),
When the lumbar support and the armrest are in the respective predetermined states, it is shown in FIG. 7C, and at this time, the operation button 20
Is back and protruding. In this state, when only the lumbar support is needed, the armrest 4 may be raised and stored.

Further, by pressing the operation button 20 when the lumbar support is expanded as described above, the return spring means 32 incorporated in the lumbar drive mechanism 12 is attached so as to forcibly move the lumbar plate to the rear of the seat. At the same time, the return spring means 32 is configured to be actuated by the pressing operation of the operation button 20 again, whereby the release operation of the lumbar support can be performed extremely simply and appropriately by only pressing the operation button again. And other advantages.

It should be noted that the present invention is not limited to the structure of the above-described embodiment, and the shape, structure, etc. of each portion can be freely modified or changed as necessary. Further, the lumbar support device 10 according to the present invention is not limited to the vehicle seat as described above, but can be applied as long as it is a seat to exert its effect.

[Effect of device]

As described above, according to the lumbar support device of the present invention, the lumbar plate is provided in the seat back so as to be movable in the front-rear direction of the seat, and the lower part of the seat back is bulged. A lumbar drive mechanism that is activated by a dynamic operation and an armrest that is pivotally supported on the side of the seat back so that it can be housed and pulled out by a rotating shaft are pressed against the portion corresponding to the rotating shaft outside the armrest. In addition to providing an operation button that can be operated, a connecting means that faces the inside of the seat back when the operation button is pressed and is connected to the lumbar drive mechanism is provided. Since it is configured so that it can be moved, the arm provided on the side of the seat back is simple and inexpensive. By utilizing the strike skillfully, pressing the operation button on the outside and rotating the armrest, the lumbar support can be actuated via its drive mechanism to swell appropriately and surely. Not only can the problems such as the difficulty of the location where the operating means is attached be eliminated, but there are various practical advantages such as excellent operability and a well-formed structure.

Further, according to the present invention, when the operation button is pressed, the connection state of the connection means to the lumbar drive mechanism is temporarily held, and when the armrest is rotated by a certain amount, the lumbar support is expanded. The locking means for returning the operation button and the return spring means incorporated in the lumbar drive mechanism for forcibly moving the lumbar plate to the rear of the seat when the operation button is pressed when the lumbar support is expanded are selectively selected. By attaching the operation button to the operation button, the operation of pressing the operation button can be made one-touch, the operability of the lumbar support can be improved, and the operation of releasing the lumbar support can be easily and appropriately performed only by pressing the operation button again.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing only an essential part configuration showing an embodiment of a lumbar support device according to the present invention, FIG. 2 is a sectional view of the essential part, FIG. 3 is a detailed view of a connecting means, and FIG. 5A and 5B are schematic perspective views for explaining the operating state of the device of the present invention, FIG.
7 (a) and 7 (b) are schematic perspective views showing another embodiment of the present invention and an enlarged perspective view of a main part thereof, FIG. 6 is an enlarged sectional view of an operation button portion, and FIGS. ), (c) are schematic diagrams for explaining the operation sequence. In the drawing, 1 ... Vehicle seat, 3 ... Seat back, 4 ... Armrest, 10 ... Lumber support device, 11 ... Lumber plate, 12 ... Lumber drive mechanism, 13 ... Cam member, 16 ... Side bracket, 17 ... Rotating shaft , 20 ... operation button, 21 ... cam shaft, 22 ... engagement pin, 23 ... notch,
24 ... Transmission shaft, 25 ... Coil spring, 30 ... Engagement disc, 30a ... Engagement projection, 31 ... Engagement holes, 31a, 31b
... engagement notch, 32 ... return spring means.

Claims (2)

[Scope of utility model registration request] 1. A lumbar drive mechanism which is disposed in the seat back so as to be movable in the front-back direction of the seat and has a lumbar plate that bulges below the seat back. The lumbar drive mechanism actuates the lumbar plate by an external rotation operation. The back side portion is provided with an armrest that is pivotally supported so that it can be housed and pulled out by a rotating shaft, and an operation button that can be pressed is provided on the outside of the armrest, corresponding to the rotating shaft. When the button is pressed, a connecting means that faces the inside of the seat back and is connected to the lumbar drive mechanism is provided, and the lumbar plate can be moved in accordance with the rotation operation of the armrest. Lumber support device. 2. The lumbar support device according to claim 1, wherein when the operation button is pressed, the connection state to the lumbar drive mechanism is temporarily held and the armrest is rotated by a predetermined amount. Attached to the locking means for returning the operation button when the swells and the lumbar drive means for forcibly moving the lumbar plate to the rear of the seat when the operation button is pressed when the lumbar support swells. A lumbar support device comprising return spring means.