JPH04102408A - Motor-driven lumbar support - Google Patents

Abstract

PURPOSE:To facilitate the fine adjustment of forward/rearward positions of a support plate with a simple structure and with few parts by constituting a lumbar support in such a way that the support plate is pushed toward the front of seat-back frames in response to the change in the turning projection amount of a pressing cam. CONSTITUTION:A support plate 13 is formed, in its longitudinal section, in a convex-shape curved and projected toward the front. Accordingly, even if the support plate 13 is projectedly turned toward the front of side frames 9a, 9a making the turning center of its upper end side, dislocation toward the up- and-down direction to the lumbar part of a seating person is not caused, enabling a smooth abutment to be achieved. By operating an operation switch for turning a driver 17 to turn an operation shaft 15, the support plate 13 is gradually pushed out forward; and by turning the switch off, the support plate 13 can be stopped in a desired position. Thus, the support plate can be moved forward or rearward by a simple operation, and also an advancing, of use position can securely be maintained with little opportunity of failure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric lumbar support built into a seat bank of a seat for various vehicles such as an aircraft, a railway vehicle, a ship, or a bus.

[Conventional technology]

Conventionally, lumbar supports have been used in seatbacks of seats for various vehicles such as airplanes, railway vehicles, ships, and buses, and which adjust the position of the lumbar support surface of a seated person by displacing the lumbar support portion of the seat back in the front-rear direction. is used by the authorities.

As this type of seat lumbar support, a structure in which a support plate is moved back and forth using a large number of gears, or an air bag type lumbar support have been proposed. The gear type lumbar support has an operating shaft installed horizontally on the seat bank frame from approximately the center of the back of the support plate, and by operating a lever that is fixed and protrudes from one side frame, the back of the support plate is pushed forward and the seat is moved forward. It had a structure that pushed the bag forward.

In addition, air bank type lumbar supports have an air bag built into the lumbar region of the seat back, and air can be filled or extracted from the air bank using a hydraulic electric pump to finely adjust the forward and backward positions of the seat bank support plate. It was configured so that it could be done.

[Problem to be solved by the invention]

However, in the above-mentioned gear type lumbar support, the support plate is rotated using an operating lever or the like provided at the seatback side end of the seat, that is, on the side of the seatback frame that constitutes the lumbar support. Because the structure adjusts the forward and backward positions in stages, the number of parts such as gear mechanisms increases, and the complicated structure makes it easy for the lumbar support to malfunction while in use.Furthermore, it requires considerable force to move forward and backward. The problem was that it was necessary.

In addition, in the case of the air pack 2 lumbar support, the hydraulic electric pump itself is very heavy, and there are problems with keeping the air bag airtight and damaging it, and it also takes a long time to fill the air bank with air and remove air. The problem was that it took too much time.

The present invention was devised in view of the above problems, and provides an electric lumbar support that has a simple structure, has a small number of parts, and can easily move the support plate forward and backward in wt and m positions. The purpose is to provide

[Means to solve the problem]

In order to achieve the above object, the electric lumbar support according to the present invention includes a support section installed horizontally between the left and right side frames of a seat back frame, and a pair of bearings fixed to the support rods at appropriate intervals. In addition, an operating shaft having one or more pressing cams fixed therebetween is rotatably attached to the bearing, and respective brackets are formed on the side frame located above the support rod. In addition, the support plate is rotatably supported at the upper side of the support plate on the bracket so that the lower end thereof can freely advance and retreat in front of the seat back frame, and further includes a drive machine connected to the operating shaft. The main feature is that the pressing cam is brought into contact with the back surface of the support plate by rotating, and the support plate is pushed forward of the seat back frame in response to a change in the rotational protrusion amount of the pressing cam. It is something.

In addition, the support plate can be divided into three parts, the upper end of each support plate can be pivotally supported by a bracket formed on the seat back frame, and a pressing cam corresponding to each support plate can be fixed to the operating shaft. .

[Effect]

According to the above configuration, when the drive machine is operated and the drive shaft is rotated in a predetermined direction, the pressing cam configured on the operating shaft rotates and projects, comes into contact with the back surface of the support plate, and gradually pushes it forward. By stopping the driving machine, the support plate can be stopped at a desired position.

Moreover, by further rotating the drive machine, the pressing cam can be gradually retreated and the support plate can be returned to its original position.

Furthermore, the lumbar support constituted by a support plate divided into three parts allows the forward and backward positions of each support plate to be variably set depending on the state of fixation of the pressing cam to the operating shaft.

〔Example〕

Embodiments of the electric lumbar support according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a seat device constituting an electric lumbar support according to the present invention.

In the drawing, 1 indicates front legs 2 and rear legs 3 fixed to the floor.
The front part of both legs 2 constitutes a leg rest 4 via a seat bottom frame (not shown) for each seat, and a seat bottom 5 is mounted on the upper part of the seat bottom frame. , and sleeves 7.7 having armrests 6.6 on the upper surface are attached to both sides of the seat bottom frame, and a seat back 8 carrying the lower half between the rear ends of the sleeves 7 and 7 is mounted on both sides of the seat bottom frame. be able to swing freely in the direction,
It is supported so that the standing angle can be changed.

3 and 4 show a first embodiment of the present invention.

Reference numeral 9 denotes a seat back frame disposed inside the seat back 8. A support rod 10 is installed horizontally at a lower position inside both side frames 9a, 9a of this seat back frame 9. Bearings at both ends 1). 1) are fixed side by side, and the side frame 9a is located above the support rod 10.
, 9a to which the brackets 12.12 are fixed. This bracket 12.12 pivots the support plate 13, and has angles 1 formed on both sides of the upper end of the support plate 13.
4 is rotatably supported, and the lower end side can be swung forward of the seat back frame 9. Also, both bearings 1). 1) is placed in contact with the midsection of the support plate 13 and positioned to receive the rearward load. 15 is
It is an operating shaft for configuring one or more pressing cams 16.16 that come into contact with the back surface of the support plate 13 and act to push it forward, and its both ends are connected to the bearing 1.
). 1) is rotatably attached to the shaft.

As shown in FIG. 5, the pressing cam 16 has its negative side fixed on the operating shaft 15, and the other side swings in the circumferential direction as the operating shaft 15 rotates. , pressing cam 16
The rotation locus A formed by the other side is the bearing 1). In order to be formed outside the protrusion length of 1), it is configured to have a pivoting position or shape growth. That is, the support plate 13
is the radius length Ll of this rotation locus A and the bearing 1). 1)
The seatback frame 9 is pushed forward by a difference L2 in the protruding length of the seatback frame 9, and this difference L2 is appropriately designed to suit the thickness of the seatback itself, the material of the cushion, etc. It is subject to change. Moreover, the support plate 13 has a convex shape that curves and protrudes toward the front side in its longitudinal cross-sectional shape. Therefore, the support plate 13 rotates around the upper end side of the side frames 9a, 9a.
Even when the seat member protrudes forward and rotates, the seat member can be brought into smooth contact with the lumbar region of the seated person without causing vertical displacement. The maximum amount of displacement of the support platework 3 in the front-rear direction is determined by the operating axis 150 as shown in FIG.
This can be achieved when the rotation angle is 90 degrees with respect to the support plate 13. Therefore, the pressing cam 16
It is desirable to configure the operating shaft 15 so that the difference length L1 can be rotated within a 90 degree rotation angle of the operating shaft 15.

On the back surface of the support plate 13, rollers (not shown) can be installed to smooth the sliding movement of the press cam 6. The support plate 13 is retracted toward the seat back frame 9 when not in use, and advances from the seat bank frame 9 side toward the front thereof, that is, toward the cushion formed on the seat back 8 when used. Further, by replacing the pressing cam 16 with one of a different size, the amount of protrusion of the support plate 13 can be changed.

Next, a method of using the electric lumbar support according to the present invention will be explained.

First, operate the operation switch (not shown) to rotate the drive machine 17 to rotate the operating shaft 15 to gradually push the support plate 13 forward, and then stop the switch to move the support plate 13 at the desired position. It can be stopped.

Furthermore, when returning the lumbar support to its original position, the support plate 13 can be gradually retreated by operating the same switch.

FIG. 6 shows a second embodiment of the present invention, and only the differences from the first embodiment will be explained.

In the second embodiment, in order to further improve the adhesion of the support plate to the lumbar vertebrae of the seated person, the support plate is divided into three parts: a main support plate 18 and sub-support plates 19 and 19 located on both sides of the main support plate 18; Advance distance from main support plate 18
This is a little more than the advance distance. That is, there is a wide main support plate 18 in the center, two sub-support plates 19.19 on both sides, and the upper ends of each support plate are pivotally supported on respective brackets 12 and 12 formed on the sheet bank frame 9.

These support plates 18, 19 can be individually and independently projected forward. On the other hand, pressing cams 20 and 21 are fixed to the operating shaft 15 in accordance with the positions of the support plates 18 and 19, respectively. In this embodiment, two pressing cams 20.20 are fixedly installed for the main support plate 18, and one for the sub-support plate 18.
Pressing cams 21, 21 are fixedly attached to the operating shaft 15, respectively.

In addition, as shown in FIG. 7, in order to make the movement of the sub-support plate 19 slightly larger than that of the main support plate 18, the pressing cams 21, 21 (radius Y) for the sub-support plate 19 are A pressing cam 20 (radius X) larger than the pressing cam 20 of the plate 18 is fixedly installed.

〔Effect of the invention〕

Since the electric lumbar support according to the present invention is constructed as described above, it has a simple mechanism and uses a drive machine, so the support plate can be moved forward and backward with a simple operation, and it can also be used in an advanced position. can be maintained reliably, and failures are extremely rare.

Further, by changing the shape of the pressing cam and the fixed position with respect to the operating shaft, the amount of protrusion of the support plate can be freely changed, and the effects after implementation of the present invention are extremely large.

[Brief Description of the Drawings] Fig. 1 is a side view of the seat device constituting the electric lumbar support according to the present invention, Fig. 2 is a front view of the same, and Fig. 3 is an exploded seat back showing the electric lumbar support. FIG. 4 is an exploded perspective view of essential parts showing the first embodiment of the present invention; FIG. 5 is an enlarged side view similarly showing the operating state of the pressing cam; FIG. 6 is a second embodiment of the present invention. FIG. 7 is an enlarged side view showing the operating state of the pressing cam. 9...Seat bank frame 0...Support rod 1)...Bearing 2...Bracket 13...Support plate 5...Operating shaft
16...Press cam 7...Driver 18...
・Main support plate 9...Sub support plate 0.21...Press cam

Claims (2)

[Claims] (1) A support gap is installed horizontally between the left and right side frames of the seat back frame, a pair of bearings is fixed to the support rod at an appropriate interval, and one or more pressing cams are fixed between the bearings. The provided operating shaft is rotatably mounted, and each bracket is formed on the side frame located above the support rod, and the upper end of the side end of the support plate is rotatably attached to the bracket. The lower end side is configured to be pivoted on the seat back frame so that it can move forward and backward freely toward the front of the seat back frame, and furthermore, by rotating the drive unit connected to the operating shaft, the pressing cam is brought into contact with the back surface of the support plate. An electric lumbar support characterized by being configured to push a support plate forward of a seat back frame in response to changes in the rotational protrusion amount of a pressing cam. (2) The upper end of each support plate divided into three parts is pivotally supported by a bracket formed on the seat back frame, and a pressing cam corresponding to each support plate is fixedly attached to the operating shaft. The electric lumbar support according to claim 1.