JPH0450832Y2 - - 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 requirements, and in this case, the height of the top surface of the seat bottom from the floor of the passenger compartment is regulated, so the conventional seats mentioned above cannot be applied. There is.

Furthermore, these conventional automobile seats exhibit cushioning properties centered on the hip point of the seated person (point H, which corresponds to the center of rotation of the torso and girth of the human body), which is the point of application of the load. Therefore, the cushioning properties of the seat bottom are not effectively utilized.

(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 in which the thickness of the seat can be reduced and the cushioning properties of the seat bottom can be effectively utilized.

(Structure of the invention) This invention consists of a frame having a pair of side frames on the left and right, a torsion bar that is rotatably arranged around a horizontal axis at the front end between the pair of side frames, and a torsion bar that is rotatable around a horizontal axis. The seat bottom is equipped with an externally inserted cylinder, an arm protruding from the cylinder to the rear of the seat and fixed, and a seat plate attached to the rear end of the arm so as to be swingable about a horizontal axis,
One end (fixed end) of the cylindrical body is fixed to the torsion bar, and the other end (free end) is supported by a frame so as to be rotatable around the axis, and the torsion bar on the free end side of the cylindrical body is A lever is fixed to the end 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 is twisted around its axis. In addition, the lever is configured to be able to change its position in the rotational direction around the axis of the torsion bar, and the arm is formed by connecting a plurality of arm members to each other, and an elongated hole is formed through the connecting portion. The arm is configured to be extendable and retractable by means of a connecting means provided through the elongated hole.

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 fixed end of the cylinder body is twisted, and this torsional restoring force causes the seat bottom to have cushioning properties. is applied, and 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. Furthermore, by adjusting the arm to expand and contract, the position of the seat plate can be adjusted according to the hip point of the seated person, so that the cushioning properties of the seat bottom can be effectively utilized.

(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 to 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 horizontal axis b parallel to the rotation axis a.

The arm 41 has a pair of front and rear arm members 41.
1,412, and a bolt/nut (connecting means) 414 that connects the two to each other via a horizontally long hole (long hole) 413 formed through the arm member, and the rear arm member 412 is connected to the horizontally long hole 4
13 in the front-rear direction of the seat, the position of the swing center axis b of the seat plate 4 can be expanded and contracted in the front-rear direction of the seat according to the hip point X of the seated person. has been done.

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 positioned so that its swing center axis b corresponds to the hip point The torsion force of the torsion bar 2 is released by regulating the position of the torsion bar 2. 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 applied to the arm 41 and the cylinder 3.
The rotational force is transmitted to one end of the torsion bar 2 through the fixed end 33 of the fixed end 33.
The torsion bar 2 (effective torsion bar length: l, see Figure 2) between the lever 21 and the lever 21 is at its end a.
Twisted around. Therefore, the torsional restoring force from the torsion bar 2 in the effective torsion bar length portion 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 the reverse direction.

In this way, the seat bottom B can be adjusted to be hard or soft 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 of the lever 21 in the first embodiment is manually adjusted. In FIG. 4, a protruding piece 131 is formed to protrude downward from the bottom frame part 13, and the front frame part 1
A bracket 61 is attached to the lower surface of the seat 2, and the screw 6 is disposed in the front-rear direction of the seat and rotatably supported at the same position by the protruding piece 131 and the bracket 61. An operation dial 63 is connected to the front end of the screw 6, and a square nut 64 is screwed to the rear end so as to be movable back and forth 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. .

Note that in the above embodiment, a pair of horizontally long holes 413
However, for example, a relatively long horizontally elongated hole may be formed and a pair of bolts and nuts may be placed in this horizontally long hole.

(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 changing the position of the lever. Therefore, the degree of hardness or softness of the seat bottom can be adjusted, and the hardness or softness of the seat bottom can be changed depending on the road surface condition, the seating person's preference, or the manner of driving.

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 automobile seats, manufacturing and maintenance of parts can be facilitated.

Furthermore, by adjusting the arm to expand and contract, the position of the seat plate can be adjusted according to the hip point of the seated person, so that the cushioning properties of the seat bottom can be effectively utilized.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the first embodiment of this invention along the - line in Figure 2;
FIG. 3 is a sectional view of FIG. 2 with the - line partially omitted, and FIG. 4 is a perspective view showing the second embodiment.
FIG. 5 is a sectional view taken along the - line in FIG. 4. 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, 4
11, 412...Arm member, 413...Horizontal long hole (long hole), 414...Bolt nut (connection means),
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 protrudes from the cylindrical body to the rear of the seat and is fixed, and a seat plate that is attached to the rear end of this arm so that it can swing around a horizontal axis. ) is fixed to the torsion bar, and its other end (free end) is supported by the frame so as to be rotatable around the axis, and a lever is attached to the end of the torsion bar on the free end side of the cylinder. 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 its axis, and the lever is twisted around the axis of the torsion bar. The arm is configured such that its position can be changed in the rotational direction of the arm, and the arm is formed by connecting a plurality of arm members to each other, and a long hole is formed through the connecting portion, and the arm is arranged to pass through the long hole. An automobile seat characterized in that the arm is configured to be extendable and retractable by means of a connecting means.