JP2000236984A - Lumber support mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lumber support stored in the backrest of a seat from being displaced with the backrest both in an ordinary state and in a reclining state. SOLUTION: Both ends of a U-shaped lumber support frame 8 with a support board 10 on the upper side are pivotally attached to the rear ends of a seat. The upper part of the lumber support frame 8 is inserted into a reclinable backrest from the bottom end of the backrest, and a rod 11 to be stored inside the backrest is pivotally attached to the backrest frame 6, The top of the rod 11 abuts to the rear side of the lumber support 7, and a cam 14 abuts to the rear side of the rod 11. The cam 14 makes the lumber support 7 project by way of the rod 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lumbar support mechanism for, for example, an automobile seat.

[0002]

2. Description of the Related Art FIGS. Sheet 1)
The lower end of the backrest frame (6) of the backrest (3)
The lumbar support (27) built in the backrest (3) is attached to the rear end of the seat frame (5A) of (2) so as to be reclined, and both sides (6A) of the backrest frame (6) , 6
A), a U-shaped lumbar support frame (28) is supported to be able to rotate back and forth, and a support plate (30) is attached to the front side of the lower side of the lumbar support frame (28). A cam (34) is in contact with the rear side of one side of the support frame (28), and a handle (36) is attached to the outside end of the cam shaft (35) of the cam (34) ( For example, utility model registration No. 25
41913).

In the above configuration, the lumbar support frame (28) is turned forward by the cam (34) by turning the handle (36) in the direction of the arrow from the retracted state of the lumbar support shown by the dotted line in FIG. In the protruding state, the lumbar spine of the person H sitting is supported.

[0004]

In the structure of the conventional lumbar support described above, when the backrest (3) is reclined as shown in FIG. 7, the lumbar support (27) also moves together with the reclining of the backrest frame (6). In addition, there is a problem that the support point P of the lumbar support 27 moves upward to P 'and is shifted from the lumbar position of the person H.

[0005]

According to the present invention, as a means for solving the above-mentioned conventional problems, both ends of a U-shaped lumbar support frame (8) having a support plate (10) mounted on an upper side are seated. (2) The lumbar support frame (8) pivotally attached to the rear end, and the upper part of the lumbar support frame (8) is inserted into the backrest (3) from the lower end of the reclining backrest (3). A rod (11) having an upper end pivotally attached to the backrest frame (6) is provided, and the distal end of the rod (11) abuts on the rear side of the lumbar support (7), and further the rear side of the rod (11). Provides a lumbar support mechanism with which the cam (14) is in contact.

[0006]

[Action] The handle (16) of the lumbar support (7) is turned to rotate the rod (11) forward by the cam (14), and the rod (11) pushes the lumbar support frame (8) forward,
The support plate (10) of the lumbar support frame (8) is projected forward, and the pad (17) of the backrest (3) is pressed. When the backrest (3) is reclined in such a state that the lumbar support (7) is protruded, the lumbar support frame (8) also rotates rearward due to the reclining of the backrest (3). However, since the lumbar support frame (8) is pivotally mounted on the seat (2) side, the distance of the support plate (10) from the seat surface does not substantially change.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to an embodiment shown in FIGS. 1 to 4. The seat (1) is installed in, for example, an automobile, and comprises a seat (2) and a seat (2). ) Comprises a backrest (3) which is mounted so as to be reclineable via a reclining device (4). As shown in FIG. 2, a lumbar support mechanism (7) is built in the backrest (3). I have.

The lumbar support mechanism (7) has both ends rotatably supported on both sides (5A, 5A) of a seat frame (5) via a shaft (9), and a support plate (10) on an upper side. The U-shaped lumbar support frame (8) is attached, and the upper end is pivotally attached to one side (6A) of the backrest frame (6) via the shaft (12), and the lower pressing block (13) is A rod (11) abutting on the rear side of the lumbar support frame (8), a cam (14) abutting on the rear side of an intermediate portion of the rod (11), and an eccentric shaft (cam shaft ( 15)) and a handle (16) attached to the outside of the tip.

In the backrest (3), a pad (17) is attached from the front to the upper end of the backrest frame (6),
A trim (18) is applied to the surface. When the handle (16) is turned in the direction of the arrow in FIG. 3, the rod (11) is pushed forward by the cam (14), and the pressing block (13) of the rod (11) is moved to the lumbar support frame ( 8) Pushing the rear side, the support plate 10 of the lumbar support frame 8 pushes the pad 17 so that the pad 17 projects together with the trim 18. The protrusion P supports the lumbar spine of the person H sitting on the seat (1). The cam (14) may be rotated by a motor or the like.

When the backrest (3) is reclined rearward from the normal state shown in FIG. 3 as shown in FIG. 4, the lumbar support frame (8) also rotates rearward. However, since the shaft (9) of the lumbar support frame (8) is attached to the seat frame (5) side of the seat (2), the support plate (10) is naturally moved from the shaft (9) of the lumbar support frame (8). ) Does not change, and therefore the position of the protrusion P of the lumbar support 7 does not substantially change, and does not deviate from the position of the lumbar vertebra of the person H (proper position).

[0011]

According to the present invention, the lumbar support position is maintained at the proper position without shifting from the lumbar position of the person sitting in the normal state and the reclining state, so that it is possible to provide a seat with very good sitting comfort. The lumbar support mechanism of the present invention can be applied to vehicles such as trains, ships, and aircraft, office chairs, easy chairs, theater chairs, and the like, in addition to automobile seats.

[Brief description of the drawings]

 1 to 4 show one embodiment of the present invention.

FIG. 1 is a perspective view of a seat.

FIG. 2 is a perspective view of a seat frame.

FIG. 3 is a side view of the seat in a normal state with a side cutout.

FIG. 4 is a side view of a seat reclining state, and FIG. 5 to FIG. 7 show a conventional example.

FIG. 5 is a perspective view of a seat frame.

FIG. 6 is a side view of the seat in a normal state with a side cutout.

FIG. 7 is a side view of a side notch in a seat reclining state.

[Explanation of symbols]

 2 Seat 3 Backrest 6 Backrest frame 7 Lumbar support mechanism (Lumbar support) 8 Lumbar support frame 11 Rod 10 Support plate 14 Cam

Claims (1)

[Claims] An upper end of a U-shaped lumbar support frame having a support plate attached to an upper side is pivotally connected to a rear end of a seat, and an upper portion of the lumbar support frame is inserted into a backrest from a lower end of a reclining backrest. A rod having an upper end pivotally attached to a backrest frame is provided in the backrest portion, and a tip end portion of the rod abuts a rear side of the lumbar support, and a cam abuts a rear side of the rod. Lumbar support mechanism characterized by the following: