JPH08150040A - Lumber support used for vehicle sheet - Google Patents

Abstract

PURPOSE: To unitize components and decrease the number of the components by incorporating a pipe and a bracket with a torsion bar by a snap action rotatably in advance and welding them to the bottom of a sheet back frame. CONSTITUTION: A lumber support 10 is constituted by bending a torsion bar 11 to a support arm 16 at one end and an operation arm 17 at the other end, incorporating plural pipe brackets 12 with the torsion bar 11 at specific intervals by the snap action rotatably in advance and welding them to a bottom 42 of a sheet back frame 41 of a front sheet 40, and supporting the torsion bar 11 on the sheet back frame 41 so that the torsion bar can swing. A support plate 13 is supported on the support arm 16 of the torsion bar 11, and a cam 14 is supported rotatably on the side 43 of the sheet back frame 41; and the operation frame 17 of the torsion bar 11 is engaged with the cam surface and the cam is swung by a knob 15.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to lumbar supports used in vehicle seats.

[0002]

BACKGROUND ART In a lumbar support used for an automobile seat, a torsion bar is attached to a seat back frame by a clamp or a U-shaped bracket, so that parts cannot be unitized and assembly workability is poor. In addition, the support plate sandwiches the tip of the support arm of the torsion bar with the cut and raised, and the support plate is swaged and supported by the torsion bar, and the tip of the support arm of the torsion bar is further fixed. Since it is pinched or bent to prevent it from coming off, assembly work was troublesome. Further, the cam fits the shaft in the bearing hole of the side bracket in the axial direction, which makes the assembling work troublesome.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a lumbar support used for a vehicle seat where the parts are unitized so that the parts can be easily assembled to a seat back and the assembly cost is reduced. is there.

[0004]

Means corresponding to the object and the operation thereof
One end is bent to the support arm and the other end is bent to the operation arm, and the torsion bar is pre-rotatably assembled to the torsion bar by snap action and fixedly fixed to the bottom of the seat back frame. Then, a pipe bracket that swingably supports the torsion bar on the seat back frame, a support plate supported by a support arm of the torsion bar, and a side of the seat back frame. Includes a rotatably supported cam surface that engages the operating arm of its torsion bar, and a cam that is swung by a knob, and allows the parts to be unitized and easily assembled to the seat back By the way.

[0005]

DESCRIPTION OF SPECIFIC EXAMPLES Hereinafter, the lumbar support used in the vehicle seat of the present invention will be described based on the specified and illustrated specific examples. FIGS. 1 to 7 show a front seat 40 of a passenger car. 10 shows a specific example 10 of a lumbar support used for a vehicle seat according to the present invention, in which a torsion bar 11 has a support arm 16 at one end and an operating arm 1 at the other end.
7, a plurality of pipe brackets 12, 12 are pre-rotatably assembled to the torsion bar 11 by a snap action at predetermined intervals, and the seats of the front seat 40 thereof. The torsion bar 11 is welded to the bottom 42 of the back frame 41 to swingably support the torsion bar 11 on the seat back frame 41, and further, the support plate 13 is attached to the support arm 16 of the torsion bar 11. In addition, the cam 14 is rotatably supported on the side 43 of the seat back frame 41 so that the cam surface 22 supports the operation arm 1 of the torsion bar 11.
7 is engaged, and is being rocked by the knob 15.

The pipe brackets 12, 12 may be pressed into a pipe bracket 30 having projections 31, 31 as shown in FIG. 3, in which case the torsion bar is securely attached. It becomes possible to assemble and the parts can be unitized, and generalization becomes possible. In addition, the number of parts is reduced on the line to improve efficiency and reduce costs.

The support plate 13 has a lanced bridge projecting in the center of its rear surface 18, as shown in FIGS.
e) 19 and a pair of cut-and-raised parts 20 and 21 projecting from the rear surface 18 of the lanced bridge 19 with a predetermined space left and right.
Is supported by the torsion bar 11 by fitting it to the tip of the support arm 16, and one of the pair of cut-and-raised parts 20 and 21 is utilized for retaining the support arm 16. Particularly, where the pair of cut-and-raised parts 20 and 21 are pressed, even if the support plate 13 is assembled to the support arm 16 in the opposite direction, the support plate 13 is prevented from coming off from the support arm 16. It is about to be done.

The cam 14 is rotatably supported via a shaft 24 on a side bracket 27 which is welded to the side 43 of the seat back frame 41 as shown in FIG. The end surface 23 is projected at a predetermined interval in the rotational direction, and the side
It is provided with a plurality of stoppers 25, 26 which are in contact with the bracket 27 and determine the pushing position of the support plate 13 and the maximum rotation position of the torsion bar 11.

In this case, the cam 14 and the stopper 2
5 and 26 are integrally molded from resin, and compared with the conventional cams that use pins as stoppers, drilling on the cams and pin assembly work are omitted, resulting in significant cost reduction. Is reduced to.

As shown in FIG. 7, the side bracket 27 has bearing holes 28, 28 and shaft holes 28, 28.
The slit 2 for fitting the shaft 24 of the cam 14 into the
9 and 29, and allows the cam 14 to be easily assembled. More specifically, the shaft 24 comprises notches 32, 32 and slot 33, 33 at the width spacing of its side bracket 27, as shown in FIGS. 8 and 9, and Notch 32,
The cam 14 is splined to the shaft portion between 32 and the slot grooves 33, 33. Therefore,
The cam 14 slides over the shaft 24, as shown in FIGS.
And, it is assembled to the side bracket 27 by utilizing the slot grooves 33, 33.

As described above, in the lumbar support 10, the pipe brackets 12, 12 are pre-rotatably assembled to the torsion bar 11 by the snap action so that the seat back frame 4 can be secured.
1 is welded to the bottom 42, and as a result, the parts are unitized, the number of parts on the line is reduced, the seat back can be easily assembled, and the assembly cost is reduced.

As will be apparent from the specific embodiments of the invention described above with reference to the drawings, those of ordinary skill in the art to which the invention pertains have ordinary skill in the art. Is the nature of the invention (na
It is easily embodied in another embodiment that is derived from the true) and the substance and is objectively accepted to have them internalized. Of course, the contents of the present invention correspond to the subject of the invention (be commensu).
rate with) and is essential for the establishment of the invention.

[0013]

Benefits of the Invention As will be understood from the above, the lumbar support used in the vehicle seat of the present invention comprises a torsion bar having one end bent to a support arm and the other end bent to an operation arm, and a snap action. Pipe bracket that is pre-rotatably assembled to the torsion bar and fixedly fixed to the bottom of the seat back frame, and that swingably supports the torsion bar on the seat back frame. And the support plate supported by the support arm of the torsion bar, and rotatably supported by the side of the seat back frame, engage the operation arm of the torsion bar with the cam surface, and with the knob A lumbar support used in the vehicle seat of the present invention because it includes a swingable cam. So parts are unitized, is easy and efficiency can assemble to the seat back is reduced costs decreased number of parts, resulting in a very useful and practical for the vehicle seat.

[Brief description of drawings]

FIG. 1 is a front view showing a specific example of a lumbar support used for a vehicle seat of the present invention applied to a front seat of a passenger car.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an end view showing another pipe bracket.

FIG. 4 is a rear view of the support plate as viewed from the rear.

5 is a sectional view taken along line 5-5 of FIG.

6 is a cross-sectional view taken along line 6-6 of FIG.

FIG. 7 is an end view of the cam seen from the side.

FIG. 8 is an explanatory view of the work for assembling the cam to the side bracket.

FIG. 9 is an assembled state diagram of a cam and a side bracket.

[Explanation of symbols]

 11 Torsion Bar 12 Pipe Bracket 13 Support Plate 14 Cam 16 Support Arm 17 Operating Arm 19 Lanced Bridge 20 Cut and Raised 21 Cut and Raised

Claims (4)

[Claims] 1. A torsion bar, one end of which is bent to a support arm, and the other end of which is bent to an operation arm. The torsion bar is pre-rotatably assembled to the torsion bar by a snap action and fixed to the bottom of the seat back frame. Pipe bracket that supports the torsion bar swingably on the seat back frame, a support plate supported by the support arm of the torsion bar, and the seat back. A lumbar support used for vehicle seats that includes a cam rotatably supported on the side of the frame, the operation arm of the torsion bar is engaged with the cam surface, and a cam swung by a knob. 2. A lanced bridge, the support plate of which projects from the rear surface thereof, and the lanced bridge.
A pair of cut-and-raised parts protruding from its rear surface at a predetermined distance from the bridge are supported by the torsion bar by fitting the lanced bridge to the tip of the supporting arm, and The lumbar support used for a vehicle seat according to claim 1, wherein one of the pair of cut-and-raised parts is utilized for retaining the support arm. 3. The cam is rotatably supported by a side bracket fixedly secured to the side of the seat back frame, and is protruded from the end face of the side bracket at a predetermined interval in the rotational direction. , And that side
The lumbar support used in a vehicle seat according to claim 1, further comprising a plurality of stoppers which are in contact with the bracket to determine the push-out position of the support plate and the maximum rotational position of the torsion bar. 4. The side bracket has a bearing hole,
The lumbar support used for a vehicle seat according to claim 3, further comprising: a slit for fitting a shaft of the cam into the bearing hole.