JPH0710598Y2 - Lumbar support - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lumbar support for instructing the lumbar spine of an occupant in a vehicle seat or the like.

(Prior Art) Next, a conventional example will be described with reference to the drawings. FIG. 8 is a front view showing a conventional lumbar support, FIG. 9 is a plan view of FIG. 8, and FIG. 10 is a side view of the guide in FIG.
FIG. 11 is a plan configuration diagram in FIG.

First, in FIG. 8 and FIG. 9, 1 is a bracket fixed to a frame of a seat back, 2 is two coil portions 2a, 2b on the base end side, and an engaging portion 2c is provided between these coil portions 2a, 2b. It is a torsion bar that is formed and has the lumbar plate 3 attached to the tip side. Reference numeral 4 denotes a rod which is fitted into the coil portions 2a and 2b of the torsion bar 2 and is caulked to the bracket 1 to rotatably support the torsion bar 2. Reference numeral 5 is a support plate attached to the bracket 1, and 6 is a shaft rotatably supported by the support plate 5 at the base end portion and by the bracket 1 at the intermediate portion.
A guide 7 is integrally formed at an intermediate portion of the shaft 6, and a handle 8 is attached to a tip portion thereof.

As shown in FIGS. 10 and 11, the guide 7 is provided with a plurality of stepped portions 7a having different valley depths. Then, the engaging portion 2c of the torsion bar 2 is provided in the valley portion of the step portion 7a.
Are to be engaged.

Next, the operation of the above configuration will be described. When the handle 8 is rotated, the guide 7 is also rotated. When the guide 7 rotates,
The position of the stepped portion 7a with which the engaging portion 2c of the torsion bar 2 engages changes, the torsion bar 2 rotates about the rod 4, the position of the lumbar plate 3 changes, and the lumbar support is adjusted.

(Problems to be solved by the invention) Generally, the adjustment of the lumbar support is performed while the occupant is seated. That is, the lumbar support is adjusted while the lumbar plate is being pressed.

In the conventional example with the above-mentioned configuration, the driving force for driving the lumbar plate is a rotational torque for rotating the handle 8.
If the length of the arm of the handle 8 is increased, the value of the rotational torque is increased and the operating force is reduced. However, due to problems such as the design of the seat, the length of the handle 8 cannot be unnecessarily lengthened, and the value of the rotation torque is naturally limited.
Therefore, there is a problem that the operating force for pushing the back of the occupant is large.

In addition, there is a problem in that fine adjustment cannot be performed because the adjustment is extremely difficult.

The present invention has been made in view of the above problems, and an object thereof is to provide a lumbar support which has a small operating force and which can be finely adjusted.

Another object of the present invention is to provide a lumbar support having a simple structure for attaching a torsion bar.

(Means for Solving the Problems) The present invention for solving the above problems includes a pinion gear provided on one side frame of a seat back via a brake mechanism, a sector gear that meshes with the pinion gear and rotates, and an intermediate portion. Has a gap between the torsion bar to which the lumbar plate is attached and the base end fixed to the other side frame, the bent middle part, and the side frame. And a bracket having a tip portion in which an L-shaped cutout groove is formed, the tip of one end of the torsion bar is locked to the rotating end of the sector gear, and the other end of the torsion bar is After engaging the notch groove of the bracket so as to apply a biasing force that presses the occupant's back to the lumbar plate, the vicinity of the tip end portion of the bracket It is the one that is brought into contact with the middle part of the ket.

(Operation) In the lumbar support of the present invention, when the pinion gear provided on one side frame of the seat back via the brake mechanism is rotated, the sector gear meshing with the pinion gear is rotated.

When the sector gear rotates, the middle part is bent in a crank shape and the lumbar plate is attached, the tip of one end is locked to the rotating end of the sector gear, and the tip of the other end is attached to the lumbar plate to the occupant's back. The torsion bar acts on the tip of one end of the torsion bar locked to the bracket provided on the other side frame side so as to give a biasing force to press the lumbar plate.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view for explaining an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a left side view for FIG. 1, and FIG. 4 is FIG. Fig. 1 is the view from the arrow B in Fig. 5,
FIG. 6 is an exploded perspective view for explaining the brake mechanism in the drawings, and FIGS. 6 and 7 are views for explaining the operation in FIG.

1 to 4, 10 and 11 are side frames of the seat back, and 12 is a bracket provided on one side frame 10. Reference numeral 13 is a handle shaft having a handle 14 attached to its tip end and a pinion gear 15 attached to its base end. Reference numeral 16 is a brake mechanism provided on the bracket 12.

Here, the brake mechanism 16 will be described with reference to FIGS. 5 to 7. In this brake mechanism 16, the brake housing
The torsion spring 18 is installed in the brake housing 17
A core 19 having a notch 19a formed therein is rotatably inserted into the torsion spring 18 so as to press the inner wall of the core. The core 19 is integrally fixed to the handle shaft 13. Furthermore, the notch of the core 19
Between the hook portions 18a and 18b of the torsion spring 18 in the space of 19a, the claw portion 20a of the stopper plate 20 formed integrally with the pinion gear 15 is provided with the handle shaft 13
It is inserted and arranged so as to be rotatable around.

Therefore, as shown in FIG. 6, with respect to the rotational force from the side of the pinion gear 15, the claw portion 20a moves toward the torsion spring 18a.
Push the hook 18a or 18b of the
Since it acts to widen the outer diameter of the, the pressure contact force between the torsion spring 18 and the brake housing 17 becomes stronger,
The rotation of the pinion gear 15 is blocked. On the other hand, as shown in FIG. 7, with respect to the rotational force from the handle shaft 13 side, the force in the direction in which the hook portion 18a or 18b of the torsion spring 18 contracts the outer diameter from the side end portion 19b or 19c of the core 19 is applied. As the pressure contact force is reduced, the handle shaft 13
The rotation of the torsion spring 18 and the claw
The pinion gear 15 can be rotated via 20a.

Reference numeral 21 is a sector gear that is rotatably provided on the bracket 12 using a pin 22 and that meshes with the pinion gear 15. The sector gear 21 has a long hole 21a (see FIG. 2), and a stopper plate 25 is fixed around the long hole 21a.

24 is a bracket provided on the other side frame 11. The bracket 24 has a gap between a base end portion 24a fixed to the side frame 11, a bent intermediate portion 24b, and the side frame 11, and has a substantially L-shaped cutout groove 24c.
And a front end portion 24d formed with.

26 has one end fitted to the lower end of the elongated hole 21a of the sector gear 21 provided on one side frame 10 side, the middle part bent in a crank shape, and the lumbar plate 27
Is attached, and the other end is a torsion bar locked to the bracket 24 of the other side frame 11.

The tip 26a at one end of the torsion bar 26 is bent into a substantially U shape and is locked to the upper end of the elongated hole 21a of the sector gear 21 (see FIGS. 2 and 3).

On the other hand, as shown in FIG. 4, the other end of the torsion bar 26 is engaged with the notch groove 24a of the bracket 24 so as to apply a biasing force to the lumbar plate 26 for pressing the back of the occupant at the time of mounting. After this, the tip 26b is twisted in the direction opposite to the arrow I and brought into contact with the intermediate portion 24b of the bracket 24. That is, as shown in FIG. 4, the torsion bar 26
The tip end 26b of the is pressed against the intermediate portion 24b by the urging force in the arrow I direction.

Reference numeral 28 denotes a pin provided on the stopper plate 25 to prevent the torsion bar 26 from coming off the elongated hole 21a, and 29 denotes a stopper plate to prevent the torsion bar 26 from coming off the bracket 24.

Next, the operation of the above configuration will be described. When the handle 14 is rotated, the pinion gear 15 is rotated via the brake mechanism 16. The rotation of the pinion gear 15 causes the sector gear 21
Rotates around pin 22. As the sector gear 21 rotates, a torsional force acts on the torsion bar 26 that is locked at the upper end of the slot 21a that is the rotating end of the sector gear 21, and the torsion bar 26 is attached to the middle part that is bent into a crank shape. The lumbar plate 27 thus swung swings to adjust the lumbar support.

According to the above structure, the torsion bar 26 has the urging force by which the lumbar plate 27 presses the occupant's back. Therefore, the operating force when the lumbar plate 26 moves in the direction of pressing the occupant's back is reduced as compared with the conventional case. Further, by appropriately setting the gear ratio between the pinion gear 15 and the sector gear 21, it is possible to further obtain the optimum operating force.

Then, by increasing the number of gears of the sector gear 21, the operation amount of the lumbar plate 27 can be set appropriately.

In addition, the combination of the pinion gear 15 and the sector gear 21 provides stepless adjustment, which enables fine adjustment.

Further, the other end of the torsion bar 26 has a structure in which it is twisted and brought into contact with the intermediate portion after engaging with the substantially L-shaped notch groove 24c. Therefore, the torsion bar 26
Is pressed against the end of the cutout groove 24c (the inner part of the horizontal groove portion A), and moves in the direction away from the cutout groove 24c,
Also, the vertical movement is restrained, and the torsion bar 26 can be prevented from coming off the bracket 24.
Moreover, the structure is simple.

(Effect of the Invention) As described above, according to the present invention, the operation force is small,
Fine adjustment is possible and a lumber support with a simple torsion bar mounting structure can be realized.

[Brief description of drawings]

FIG. 1 is a front view for explaining an embodiment of the present invention, FIG. 2 is a view taken along arrow A in FIG. 1, FIG. 3 is a left side view for FIG. 1, and FIG. 4 is FIG. FIG. 5 is an arrow view in FIG. 5, FIG. 5 is an exploded perspective view illustrating the brake mechanism in FIG. 1, FIGS. 6 and 7 are views illustrating the operation in FIG. 5, and FIG. 8 is a conventional lumbar support. The front view shown in FIG. 9, FIG. 9 is a plan view of FIG. 8, FIG. 10 is a side view of the guide shown in FIG. 8, and FIG. 11 is a plan view of FIG. In these figures, 1 ... Bracket 2,26 ... Torsion bar 3,27 ... Lumber plate, 4 ... Rod 5 ... Support plate, 6 ... Shaft 7 ... Guide, 8 ... Handle 10,11 …… Side frame 12, 24 …… Bracket 13 …… Handle shaft 14 …… Handle, 15 …… Pinion gear 16 …… Brake mechanism, 21 …… Sector gear 22 …… Bush, 24 …… Bracket 24a …… Base end, 24b …… Middle part 24c …… Notched groove, 24d …… Tip part

Claims (1)

[Scope of utility model registration request] 1. A side frame (1) of a seat back (1)
0) via a brake mechanism (16), a pinion gear (15), a sector gear (21) that meshes with the pinion gear (15) and rotates, and an intermediate portion is bent in a crank shape and a lumber plate (15) is formed. Torsion bar with attached 27) (26)
And a base end portion (24a) fixed to the other side frame (11), a bent intermediate portion (24b), and a side frame (11), and a substantially L-shaped cut. Notch groove (24
bracket (2) consisting of the tip (24d) formed with c)
4), the tip of one end of the torsion bar (26) is locked to the rotating end of the sector gear (21), and the other end of the torsion bar (26) is The notch groove (24c) of the bracket (24) so as to apply a biasing force to the passenger's back to (27).
The lumbar support, characterized in that after engaging with, the vicinity of the tip end is brought into contact with the intermediate portion (24b) of the bracket (24).