JP4478949B2 - Seatback lumbar support device - Google Patents

Description

  The present invention relates to a lumbar support device for a seat back that can firmly support a seated person's herbis part (pelvis part) and lumbar part (lumbar part) to ensure an optimal sitting posture.

  Conventionally, as a lumbar support device for a seat back in an automobile seat or the like, a predetermined portion of a plate member such as a contour mat or a resin mat is pushed forward by turning a lumbar support bar arranged on the rear side, There are known ones that are fitted to and supported by a herbis part or a lumbar part.

  FIG. 11 shows such a conventional example. In the figure, 21 is a seat back frame, 22 is a plate member made of a contour mat or a resin mat, and 23 is a plate member 22 connected to the seat back frame 21. A spring to be supported, 24 is a rod stretched over the seat back frame 21, and 25 is a lumbar support bar. In such an apparatus, as shown in FIG. 12, the predetermined portion of the plate member 22 is pushed forward by rotating the lumbar support bar 25 around the pivoting portion 25a manually or electrically. It is configured to fit the person's herbis part and lumbar part.

  However, in the prior art, as shown in FIG. 12, the plate member 22 pushed out by the lumbar support bar 25 is in a state where only the portion protrudes locally, and a large sitting pressure (pressure felt on the body) is given to the seated person. (See the human body pressure distribution in the figure). As a result, there is a problem in that it gives a foreign body feeling or causes pain, numbness, fatigue, etc. when sitting for a long time.

On the other hand, as shown in, for example, Patent Document 1, a lower part of a connecting member that is installed vertically in the center portion of a seat back frame is installed so as to be swingable, and a seated person is operated by swinging the connecting member in the front-rear direction. There has also been proposed a seat back that improves the holdability. However, the shape of the connecting member itself does not change, and the lower part is simply adjusted back and forth, so that the connecting member is finely attached to the helvis part (pelvis part) and lumbar part (waist part) of the seated person. It was not possible to make adjustments.
JP-A-8-24075

  The present invention solves the above-described problems, and the shape of the plate member made of a contour mat, a resin mat, or the like changes so as to press the lumbar part of the seated person, and in particular, a herbis part (pelvis part) or lumbar part The present invention has been completed for the purpose of providing a lumbar support device for a seat back that can firmly support the (lumbar region) and can ensure an optimal seating posture without a sense of incongruity or fatigue.

The seat back lumbar support device of the present invention made to solve the above-mentioned problems is a seat back lumbar support device which can be bayed so as to press the lumbar part of the seated person against the plate member provided on the seat back frame. A bending deformation means for bending the plate member toward the seated person at a lower portion of the plate member, and an upper portion of the plate member is slid in the vertical direction along the seat back frame in accordance with the operation of the bending deformation means. A sliding restricting means is provided, the sliding restricting means has a guide member that guides the upper part of the plate member in the vertical direction, and is also rotatable in the front-rear direction with respect to the seat back frame. It is a feature.

  The lumbar support device for a seat back according to the present invention includes a bending deformation means for bending a plate member toward a seated person at a lower portion of the plate member, and an upper portion of the plate member as a result of the operation of the bending deformation means. By providing the sliding restricting means that slides in the vertical direction along the seat, the plate member can be deformed into an S-shape that is the most ideal shape for the seated person, and the seat back is placed on the back of the seated person. It will be able to hold firmly in the state where it is along.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
The drawings show the case where the present invention is applied to a seat back of a driving seat for an automobile. In the drawings, 1 is a seat back frame, 2 is a plate member made of a contour mat or a resin mat, and 3 is a plate member 2. The spring is connected to and supported by the seat back frame 1, and the above configuration is basically the same as that of a conventional seat back.

The present invention is a seat back lumbar support device that can be bayed so that the plate member 2 is pressed against the waist of the seated person, and the plate member 2 is bent and deformed toward the seated person at the lower part of the plate member 2. It has a characteristic configuration in that a bending deformation means 4 and a sliding restriction means 5 that slides the upper part of the plate member 2 in the vertical direction along the seat back frame 1 in accordance with the operation of the bending deformation means 4 are provided. Is.
With such a configuration, as shown in FIG. 2, by operating the bending deformation means 4, the lower part of the plate member 2 is brought into close contact so that the lower part of the plate member 2 moves forward and pushes out the waist of the seated person. The upper part of the plate member 2 is slid up and down without being bent forward by the movement restricting means 5, so that the overall shape of the plate member 2 is an S-shape that is close to an ideal posture. Become.
In the present invention, the lower part of the plate member means a support part in the vicinity of the seated person's pelvis and lumbar vertebrae, and the upper part means the support part in the vicinity of the shoulder part of the seated person.

  The bending deformation means 4 may have a shaft member 6 fixed to the lower end portion of the plate member 1 and a turning mechanism for turning the shaft member 6. In the figure, 4a is a handle, 4b is a brake system (fixed to the seat back frame 1) for stopping the rotation of the shaft member 6 at an arbitrary position, and a seated person turns the handle 4a to rotate the plate member. The lower part of 2 can be advanced in a curved manner to the optimum position. As shown in FIG. 3, the motor 4c and a gear 4d such as a bevel gear or a worm gear can be combined so that the motor 4c can be rotated electrically.

  As the sliding restriction means 5, it is possible to have a guide member 5 a that guides the upper part of the plate member 2 in the vertical direction. In FIG. 1, this guide member 5a is provided on the seat back frame side through a rod 7, and the plate member 2 is sandwiched between three points of the rod 7 and pins 8a and 8b protruding from the guide member 5a. By doing so, the upper part of the plate member 2 is configured to be guided in the vertical direction. Further, a stopper portion 2a for restricting the downward movement is formed at the upper end of the plate member 2.

  The guide member 5a may be of a two-point support type as shown in FIG. 5 in addition to the three-point support type as described above. In this case, the guide groove 2b formed in the upper part of the plate member 2, the rod 7 of the guide member 5a, and the pin 8a are engaged to guide the upper part of the plate member 2 in the vertical direction.

It is also preferable that the sliding restricting means 5 be rotatable in the front-rear direction with respect to the seat back frame 1. FIG. 6 shows an example thereof, in which 9 is a handle, and 10 is a brake system for stopping the rotation of the rod 7 at an arbitrary position.
With such a structure, the upper part of the plate member 2 can also be bent into an arbitrary shape according to the physique of the seated person, and the bending deformation operation of the lower part of the plate member 2 by the bending deformation means 4 described above. In combination, the entire seat back can be made into an optimal shape.

  FIG. 7 shows the case where the plate member 2 is changed into various shapes by adjusting the bending deformation means 4 and the sliding restriction means 5, and FIG. 7A shows the entire plate member in an inverted C shape on the front side. (B) shows that the upper part of the plate member 2 is linear, and only the lower part is pushed forward, and (c) shows that the upper part of the plate member 2 is rearward. The case where it is curved to the side and the lower part is pushed forward and deformed into an S shape is shown.

  Furthermore, the deformation of the plate member 2 can be easily controlled by making the plate member 2 difficult to bend and deform at the upper part and easy to bend and deform at the lower part. For example, a leaf spring 11 is applied to the upper part of the plate member 2 so as to reduce the deformation amount of the upper part of the plate member 2 (see FIG. 8), or the upper part of the lattice spacing of the plate member 2 is set downward. It is possible to change the thickness of the plate member 2 so as to be denser than the portion (see FIG. 9), or to make the thickness of the plate member 2 larger than the lower portion (see FIG. 10).

  In such an apparatus of the present invention, since the plate member 2 can be finely adjusted so as to follow the back shape of the seated person, it can be deformed into an S shape that is an ideal shape. As shown in the human body seat pressure distribution in FIG. 2, it is confirmed that the seat pressure applied to the seated person's hervis part (pelvis part) and lumbar part (lumbar part) does not protrude locally and is gentle. did it.

  As is clear from the above description, the present invention is a seat back lumbar support device capable of front bay so that the plate member provided on the seat back frame presses the waist of the seated person, Bending deformation means for bending and deforming the plate member toward the seated person at the lower portion and sliding regulation means for sliding the upper portion of the plate member in the vertical direction along the seat back frame in accordance with the operation of the bending deformation means are provided. The structure of the plate has changed so that it conforms to the back shape of the seated person. Especially, the herbis (pelvis) and lumbar (lumbar) are firmly supported, and there is no sense of incongruity or fatigue. A safe sitting posture can be ensured.

It is a perspective view which shows embodiment of this invention. It is explanatory drawing which shows the action | operation of this invention. It is a perspective view which shows a bending deformation | transformation means. It is a perspective view which shows a sliding control means. It is a perspective view which shows another sliding control means. It is a perspective view which shows another sliding control means. It is a side view which shows the shape modification of a board member. It is a perspective view which shows another board member. It is a perspective view which shows another board member. It is a perspective view which shows another board member. It is a front view which shows a prior art example. It is explanatory drawing which shows the action | operation of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Plate member 2a Stopper part 2b Guide groove 3 Spring 4 Bending deformation means 4a Handle 4b Brake system 4c Motor 4d Gear 5 Sliding regulation means 5a Guide member 6 Shaft member 7 Rod 8a Pin 8b Pin 9 Handle 10 Brake system 11 Leaf spring

Claims (3)

A lumbar support device for a seat back that allows a front bay to press a plate member provided on a seat back frame so as to press a lumbar portion of the seated person, wherein the plate member is bent and deformed toward the seated person at a lower portion of the plate member. A bending deformation means and a sliding restriction means for sliding the upper part of the plate member in the vertical direction along the seat back frame in accordance with the operation of the bending deformation means are provided. A seat back lumbar support device having a guide member for guiding the seat back and forth and capable of rotating in the front-rear direction with respect to the seat back frame .   2. The seat back lumbar support device according to claim 1, wherein the bending deformation means includes a shaft member provided at a lower end portion of the plate member and a rotation mechanism for rotating the shaft member. The lumbar support device for a seat back according to claim 1 or 2, wherein the plate member has a structure in which it is difficult to bend and deform in an upper part and is easily deformed in a lower part .

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