JPH0515797Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an automobile seat whose seat bottom can be adjusted to be hard or soft.

(Prior art) Conventionally, as a car seat whose seat bottom can be adjusted to be hard or soft,
Some of them are disclosed in the publication No. In this conventional automobile seat, the tension of the coil springs is changed by moving the locking positions at both ends of a plurality of tension coil springs stretched across the width of the seat away from or approaching each other, thereby changing the tension of the coil springs. I try to adjust the hardness and softness.
Therefore, even if the tension of the coil spring is adjusted, the tension in the width direction of the seat changes, but the tension in the longitudinal direction of the seat remains relatively the same, and the stiffness can be adjusted according to the buttocks and legs of the seated person. I can't.

Further, as an automobile seat whose seat bottom can be adjusted to be hard or soft, there is one disclosed in Japanese Patent Laid-Open No. 60-256411. In this conventional automobile seat, a hook part protrudes downward from the base end of an auxiliary frame that is rotatable around a horizontal axis at the front end of the seat, and a coil spring is attached to one end of the hook part. A rotational biasing force is applied to the auxiliary frame by the cam, and the rotational biasing force of the auxiliary frame is changed by adjusting the position of the other end of the coil spring from near or far by rotating a cam. It is something.

However, in this conventional automobile seat, since the hook portion projects downward from the base end of the auxiliary frame, the thickness of the seat bottom increases accordingly.
In recent years, vehicle heights have tended to become lower due to design demands, and in this case, the height of the top surface of the seat bottom from the floor of the vehicle interior is regulated, so the conventional seats mentioned above cannot be applied. There is.

Furthermore, these conventional automobile seats have a complicated structure and a large number of parts, so they also have the disadvantage of requiring time and effort to manufacture and maintain and manage the parts.

As a solution to these shortcomings, the Japanese Patent Application Publication No.
An example of this is a resin seat frame disclosed in Japanese Patent No. 61-5813. This seat frame is
The frame itself is made of resin with excellent elasticity, and the support surface of the seat cushion provided on the seat frame is provided with a flat part extending from the front of the seat frame approximately in the center toward the rear. A torsion spring is disposed in the support means for attaching the seat frame to the floor, and the torsion spring elastically supports the rear end portion of the flat portion.

However, in such resin seat frames, although it is possible to reduce the thickness of the seat, the cushioning properties of the seat mainly depend on the elasticity of the resin, and the torsion spring is used as an auxiliary. Because they utilize elastic force, they generally do not have very good cushioning properties for car seats, and the cushion strength cannot be adjusted arbitrarily, so the cushioning may vary depending on the weight difference of the occupants. There are problems in that the comfort varies, and the hardness or softness of the seat bottom cannot be adjusted depending on the road surface condition, the preference of the seated person, or even the manner of driving.

(Purpose of the invention) This invention was made in order to eliminate such conventional drawbacks.It has a simple configuration, and allows the seat bottom to be adjusted to be hard or soft depending on the sitting posture of the occupant. An object of the present invention is to provide an automobile seat whose thickness can be reduced.

(Structure of the invention) This invention consists of a frame having a pair of side frames on the left and right, a torsion bar arranged rotatably around a horizontal axis at the front end between the pair of side frames, and a torsion bar arranged around a horizontal axis. The seat bottom consists of an externally inserted cylindrical body, an arm that is fixed to the rear of the seat and protrudes from the cylindrical body, and a seat plate that is attached to the rear end of this arm so as to be able to swing around the pivot axis. In preparation for this, one end (fixed end) of the cylinder is fixed to the torsion bar, and the other end (free end)
is rotatably supported by a frame around the horizontal axis, and a lever is fixed to the end of the torsion bar on the free end side of the cylinder so as to restrict twisting of the torsion bar, and a load is applied to the seat plate. The torsion bar between the lever position and the fixed end of the cylindrical body is twisted around a horizontal axis, and a motor is provided to change the position of the lever in a rotational direction around the axis of the torsion bar. It is something that

According to the above configuration, when the weight of the seated person acts on the seat plate, the torsion bar between the lever position and the end fixed to the cylinder body is twisted, and this torsional restoring force imparts cushioning properties to the seat bottom. By changing the position of the lever, this torsional restoring force is changed with respect to the torsional force exerted by the same seated person, so that the hardness or softness of the seat bottom changes.

(Embodiment) FIGS. 1 to 3 show a first embodiment in which the hardness or softness of the seat bottom is changed by driving a motor M. In FIG. 1, side frames 1 on both left and right sides of the front end of the seat bottom frame 1 are shown.
1, a torsion bar 2 is attached rotatably around a horizontal axis a. This torsion bar 2
A lever 21 is fixed to one end so as to protrude downward, and between this lever 21 and the other end of the torsion bar 2, a cylindrical body 3 is attached around the torsion bar 2, as shown in FIG. 2 are extrapolated apart from each other.

This cylindrical body 3 has one end (free end) 32 on the lever 21 side supported by a bracket 31 attached to the front frame 12 and bottom frame 13 so as to be rotatable around a horizontal axis a, and the other end A portion (fixed end) 33 is fixed integrally with the torsion bar 2.

As shown in FIGS. 1 and 3, arms 41 are fixed to both sides of the cylindrical body 3 so as to protrude toward the rear of the frame 1, and a seat plate 4 is attached to the rear ends of the pair of arms 41. The torsion bar 2 is mounted so as to be swingable about a swing center axis b parallel to the rotation axis a of the torsion bar 2.

The arm 41 has a pair of front and rear arm members 41.
1,412, and a bolt/nut 414 that connects both to each other via a horizontally long hole 413 formed through the arm member, and the rear arm member 412 is inserted in the front-rear direction of the seat along the horizontally long hole 413. By moving and attaching the seat plate 4, the position of the pivot axis b of the seat plate 4 can be adjusted to the front or back of the seat according to the seated person's hip point It is configured so that it can be moved in any direction.

A bracket 51 is attached to the front frame portion 12 of the frame 1 so as to project downward as shown in FIGS. has been done. The gear box 52 holds the screw 5 so as to be able to move forward and backward, and the screw 5 is rotatably operated by the forward and reverse rotation of the motor M to move forward and backward. The rear end 53 of this screw 5 is attached to the lever 21 by a pin 211.
are connected to the lower end of each other so as to be rotatable about a horizontal axis. The motor M is configured to perform forward or reverse rotation by operating a changeover switch (not shown) provided near the seat, for example.

In the automobile seat configured as described above, the seat plate 4 is attached to a position corresponding to the hip point X by a bolt/nut 414, and the lever 21 is restricted in position as shown by the dashed line in FIG. Power is set to be released.

In this state, when a seated person sits on the seat bottom B, their weight acts on the seat plate 4, and this load causes the cylinder 3 to rotate in the direction in which the seat plate 4 sinks around the rotation axis a of the torsion bar. Force acts. This rotational force is transmitted to one end of the torsion bar 2 via the fixed end 33 of the cylinder 3, and this rotational force causes the torsion bar 2 between the fixed end 33 and the lever 21 (effective torsion bar length:
(see Figure 2) is twisted around its axis a. Therefore, the torsional restoring force from the torsion bar 2 in the length of the effective torsion bar acts on the seat plate 4 as a reaction force, thereby imparting cushioning properties to the seat bottom B.

Next, in order to adjust the hardness or softness of this seat bottom B, use the motor M by operating the changeover switch.
All you have to do is drive it forward or backward. For example, by driving the motor M in normal rotation, the screw 5 is rotationally moved from the position shown by the dashed line in FIG. 3 to the rear position shown by the solid line. As the screw 5 moves backward, the lever 21 rotates counterclockwise around the horizontal axis a from the position shown by the dashed line in FIG. A positive initial twist is forcibly applied to the length of the torsion bar to bias the seat plate 4 in the direction of flipping it up (counterclockwise in FIG. 3).

As a result, the strength of the repulsive force acting on the same load acting on the seat plate 4 increases, and the strength of the repulsive force acting on the seat bottom B increases.
The cushioning properties of the torsion bar 2 are stiffer than those in the state where the torsion bar 2 is not given the initial twist shown by the dashed line in FIG. Conversely, in order to soften the cushioning properties of the seat bottom B, the motor M may be operated in reverse.

The hardness and softness of the seat bottom B can be adjusted in proportion to the rotational drive amount of the motor M. The torsion bar 2 is used as a spring to provide cushioning properties to the seat plate 4, and since the torsion bar 2 is placed inside the cylindrical body 3 that supports the seat plate 4, the thickness of the seat can be made relatively thin. be able to.

4 and 5 show a second embodiment in which the rotation adjustment of the lever 21 in the first embodiment is performed manually. In FIG. 4, a protruding piece 131 is formed on the bottom frame portion 13 and protrudes downward.
A bracket 61 is attached to the underside of the seat 2, and the screw 6 is disposed in the front-rear direction of the seat by the protruding piece 131 and the bracket 61, and is supported rotatably at the same position. An operating dial 63 is connected to the front end of the screw 6, and a square nut 64 is screwed into the rear end so that it can move forward and backward along the screw 6.

Pins 641 are formed on both left and right side surfaces of this nut 64 to protrude laterally. Further, a lever 21a is fixed to the torsion bar 2, and another lever member 212 is fixed to this lever 21a with screws 210 as shown in FIG. It is formed into a bifurcated shape.

A long hole 213 is formed in the lower end of the lever 21a and the lever member 212 in the vertical direction, and the pin 641 of the nut 64 is inserted into the long hole 213 so as to be slidable in the vertical direction. has been done.

In the second embodiment with the above configuration, when the seated person rotates the operation dial 63 in the forward and reverse directions, the nut 6
4 moves back and forth along the screw 6, whereby the lever 21a is rotated around the horizontal axis a, and an initial twist can be applied to the torsion bar 2 in proportion to the amount of rotational operation of the operation dial 53. .

(Effects of the invention) According to the automobile seat of this invention, cushioning properties can be imparted to the seat bottom by the torsional restoring force of the torsion bar, and the torsional restoring force can be applied by the seated person's switch operation. This can be easily done by driving a motor and changing the position of the lever.As a result, the degree of hardness or softness of the seat bottom can be easily adjusted. can be easily changed by simply operating a switch, depending on the preferences of the occupant or driving style.

In addition, since the torsion restoring force of the torsion bar is used to provide cushioning properties to the seat bottom, there is no need for the structural members to protrude in the vertical direction of the seat bottom, so the thickness of the seat bottom can be reduced compared to conventional seats. can be reduced by comparison. Furthermore, since the number of parts can be reduced compared to conventional car seats, manufacturing and maintenance of parts can be facilitated.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the first embodiment of this invention;
Figure 2 is a partially omitted cross-sectional view along the - line in Figure 1;
The figure is a sectional view taken along the - line in Fig. 1, Fig. 4 is a view corresponding to Fig. 3 showing the second embodiment, and Fig. 5 is a - line sectional view in Fig. 4.
FIG. 1...Frame, 2...Torsion bar, 3...
... Cylinder, 4 ... Seat plate, 11 ... Side frame, 21, 2
1a, 212... Lever, 32... Free end of cylinder, 33... Fixed end of cylinder, 41... Arm, a
...Horizontal axis.

Claims (1)

[Scope of utility model registration request] A frame having a pair of side frames on the left and right, a torsion bar arranged rotatably around a horizontal axis at the front end between the pair of side frames, a cylindrical body fitted around the torsion bar, The seat bottom is equipped with an arm that is fixed and protrudes from the cylindrical body to the rear of the seat, and a seat plate that is attached to the rear end of the arm so as to be able to swing around a pivot axis, and one end of the cylindrical body (fixed end) is fixed to the torsion bar, and the other end (free end) is rotatably supported by the frame around the horizontal axis, and the end of the torsion bar on the free end side of the cylinder has a lever. is fixed so as to restrict twisting of the torsion bar, and when a load is applied to the seat plate, the torsion bar between the lever position and the fixed end of the cylinder body is twisted around a horizontal axis, An automobile seat characterized by being provided with a motor that changes the position of the lever in a rotational direction around an axis of a torsion bar.