JPH019701Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a suspension device for a vehicle seat.

[Prior art]

When the cushioning properties of a vehicle seat are increased, depending on the weight of the occupant, the vehicle seat may sink into the seat excessively, resulting in a worsening of riding comfort, and may impair visibility and operability during driving. Therefore, instead of increasing the cushioning properties of the vehicle seat, it is desirable to have the entire seat elastically supported on the vehicle floor by a suspension device, and to make the elastic supporting force of the suspension device variable in accordance with the weight of the occupant.

The above-mentioned suspension device includes a lower frame and an upper frame placed above the upper frame on which a seat cushion is placed, and both frames are connected by a parallel link to keep the vehicle seat horizontal and move it up and down. Such a structure is known, and as a simple method of imparting a spring supporting force to the parallel link, it has been proposed to attach a torsion bar whose both ends are twisted at a predetermined angle to each other.

The elastic supporting force of such a suspension device is adjusted by changing the amount of twist of the torsion bar to adjust its spring force, and it is desired to realize this with a simple structure.

[Purpose of invention]

In view of the above requirements, it is an object of the present invention to provide a seat suspension device that has an extremely simple structure and can arbitrarily adjust the elastic supporting force of a vehicle seat by changing the amount of twist of a torsion bar.

[Structure of the idea]

In the seat suspension device of the present invention, a shaft equipped with an adjustment handle is supported along the lower surface of the above-mentioned atsupa frame, and an eccentric pin is provided at the tip of the shaft, and the eccentric pin is brought into contact with one end of the above-mentioned torsion bar. There is.

[Effect]

When the shaft is rotated, the eccentric pin pivots, presses and deforms one end of the torsion bar that it comes into contact with, and changes the amount of twist.

〔Example〕

FIG. 1 shows a plan view of the device, and FIG. 2 shows a side view thereof. The device consists of a lower frame 1 and an upper frame 2 disposed above the lower frame 1, and the lower frame 1 is fixed to the vehicle floor (not shown) by bolts 11 (FIG. 2) provided upright thereon. A vehicle seat (not shown) is placed and fixed on the upper frame 2 by means of a mounting seat 21 formed thereon.

Both frames 1 and 2 above are front and back (left and right direction in the diagram)
The frame 2 is connected by link plates 31 and 32 arranged parallel to each other, and the frame 2 can move up and down while maintaining a horizontal state with respect to the frame 1. An auxiliary link 3 is attached to one side of the link plates 31 and 32 (lower part in FIG. 1).
3 and 34 are connected, and the auxiliary link 3
The link plate 3 is connected to the other end of 3, 34 via this.
Torsion bars 41 and 42 are connected to 1 and 32 to provide spring support force.

That is, the torsion bar 41 is arranged and fixed on the lower surface of the Atsupah frame 2 so as to cross it, and both ends are bent into a U-shape, and one of the torsion bars 41a is further twisted downward at a predetermined angle.
The one end 41a is connected to the auxiliary link 33. On the other hand, the torsion bar 42 is arranged and fixed on the upper surface of the lower frame 1, and is connected to the auxiliary link 34 by twisting one end 42a of both ends bent upward into a U-shape. When the Atsupa frame 2 moves downward due to the load of the occupant seated on the seat,
Each torsion bar 41, 42 has the above-mentioned one end 41
A, 42a and each other end 41b, 42b are deformed in a direction in which the angle formed becomes smaller, the amount of twisting increases, and the spring force increases accordingly. In addition,
5 in the figure is a shock absorber.

Now, a shaft 6 (FIG. 1) is disposed along the lower side edge of the upper frame 2. The shaft 6 has an adjustment handle 7 which is protruded to the side of the device by a worm gear mechanism which will be described later.
It is connected to. This is shown in FIGS. 3 and 4.
The shaft 6 is fitted into a recess formed on the lower surface of the Atsupa frame 2 and is rotatably supported (FIGS. 6 and 7), and a fan-shaped worm wheel 61 is provided at the base end of the shaft 6. be.

This worm wheel 61 is meshed with a worm portion 7a formed on the adjustment handle 7 (FIG. 5), and when the handle 7 is rotated by the handle 71, the shaft 6 is rotated accordingly.

The tip of the shaft 6 has a large diameter, and an eccentric pin 8 is erected on the end surface (FIG. 8).
The eccentric pin 8 is connected to the other end 4 of the torsion bar 41.
It is brought into contact with the upper surface of 1b.

If the elastic support force of the device is to be increased, the shaft 6 is rotated by means of the adjustment handle 7.

As the shaft 6 rotates, the eccentric pin 8 pivots and presses and deforms the other end 41b of the torsion bar 41 in contact with it downward. This results in
The amount of torsion of the torsion bar 41 increases, and the initial spring force when the occupant is seated increases.

When the elastic supporting force is to be reduced, the eccentric pin 8 is turned in the opposite direction to the above to alleviate the deformation of the torsion bar 41 and reduce the amount of twist.

[Effect of idea]

As described above, in the seat suspension device of the present invention, an eccentric pin provided at the tip of a rotary shaft is brought into contact with one end of a torsion bar whose both ends are twisted at a predetermined angle, and the eccentric pin is rotated to rotate the torsion bar. The spring force is adjusted by changing the amount of twist.
The elastic support force of a vehicle seat can be continuously adjusted with an extremely simple structure.

In the above embodiment, since the operating handle and the shaft are connected by a worm gear mechanism, the operating force required during adjustment is extremely small, and the operating handle has a reverse point prevention mechanism against the spring reaction force of the torsion bar. There is no need to provide

Further, since the operating handle and the shaft are arranged in a planar manner along the lower surface of the upper frame, the overall height of the device can be reduced, and a sufficient vertical operating stroke can be ensured.

Furthermore, since the shaft is fitted and supported in the recess formed on the lower surface of the upper frame, there is no need to provide a separate support member.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the device seen from above, Fig. 2 is a side view thereof, Fig. 3 is a perspective view showing the spring force adjustment structure of the torsion bar, and Fig. 4 is a view in the direction of arrow A in Fig. 1.
The figure is a sectional view taken along the - line in Fig. 3, and Figs. 5, 6, 7, and 8 are respectively - in Fig. 4.
It is a sectional view along line, - line, - line, - line. 1...Lower frame, 2...Atsupa frame,
31, 32...link board (parallel link), 41,
42... Torsion bar, 6... Shaft, 7...
...Operation handle, 8...Eccentric pin.

Claims (1)

[Scope of utility model registration request] The lower frame fixed to the vehicle floor and the upper frame on which the seat cushion is placed above the lower frame are connected by parallel links, and both ends of the parallel links are connected to each other in order to apply spring force to the lower frame. In a seat suspension device in which a torsion bar twisted and formed at a predetermined angle is attached to elastically support the above-mentioned Atsupa frame by parallel links, a shaft equipped with an adjustment handle is attached to the underside of the above-mentioned Atsupa frame. At the same time, an eccentric pin is provided at the tip of the shaft and brought into contact with one end of the torsion bar, and by rotating the shaft, the amount of torsion of the torsion bar is increased or decreased via the eccentric pin, thereby increasing or decreasing the amount of twist of the torsion bar. A seat suspension device that adjusts the elastic support force of the seat.