JPH0619411Y2 - Vehicle seat suspension system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vehicle seat suspension device, and more particularly to a seat suspension device having a lock function for stopping the suspension function when traveling on a rough road.

[Prior Art] A seat suspension device has a structure in which a spring-biased link mechanism supports an upper frame above a lower frame fixed to a vehicle floor, and a vehicle seat is placed on the upper frame. The spring force of the spring member that applies the supporting force to the link mechanism can be easily adjusted, and good cushioning properties can be obtained by providing a shock absorber as necessary.

In such a seat suspension device, the frequency of the input vibration during traveling on a rough road may be in the vicinity of the natural frequency of the device. In this case, even if a shock absorber is provided, the seat is relatively large due to resonance. It shakes and the riding comfort deteriorates.

[Problems to be solved by the invention] Therefore, a lock member is provided to regulate the relative displacement of the lower frame and the upper frame when traveling on a rough road. Restricting only this has little effect, and it is necessary to provide a lock member at the other end to restrict at both ends.

As the lock member, a member that comes into contact with the upper frame or the link arm to regulate the movement thereof is good because the structure is simple, but in this case, the vibration phase is different between one end and the other end of the seat, and the lock member is Since the lock or unlocked state is not often obtained, the operation is troublesome, and a large operation force is required to operate the two lock members at the same time.

The present invention has been made to solve such problems,
An object of the present invention is to provide a vehicle seat suspension device that can be smoothly locked at once without requiring a large operating force.

[Means for Solving the Problems] To explain the configuration of the present invention, a lower frame 1 fixed to a vehicle floor F, an upper frame 2 disposed above the lower frame 1 for mounting a vehicle seat, Link mechanisms 3A and 3B that connect the upper frame 2 to the lower frame 1 so as to move up and down while maintaining a horizontal posture, and supporting spring members 4A and 4B that apply upper frame supporting force to the link mechanisms 3A and 3B. The vehicle seat suspension device having the above-described structure abuts either of the upper frame 2 and the lower frame 1 or the link arm 31 of the link mechanism 3B at the lock position, and respectively contacts the upper frame 2 and the lower frame 1. A first lock member 5 and a second lock member 6 that restrict relative movement of one end and the other end, and the first lock member 5 described above. Is provided in
The biasing direction is reversed during the operation, and the first spring member 7 for biasing the first lock member in the lock position direction and the lock release position direction is connected to the first lock member 5 and the second lock member 6. Connecting rods 53, 62 and a second connecting rod 53, 62 which is interposed between the connecting rods 53, 62 and which acts in both compression and tension directions and which has a smaller spring force than the first spring member 7.
And a spring member.

[Operation] In the seat suspension device configured as described above, when the first lock member 5 is operated in the lock position direction, the first lock member 5 moves to the first position.
Is urged toward the lock position by the spring force of the spring member 7,
The upper frame 2 reaches the lock position at an appropriate timing.
To regulate relative movement at one end thereof.

When the first lock member 5 is biased in the lock position direction by the first spring member 7, the second spring member 8 is pulled, and the second lock member 6 is actuated by the spring force of the second spring member 8. Is delayed and reaches the lock position and abuts on the link arm 31 to restrict relative movement at the other end of the upper frame 2.

When the first locking member 5 is operated in the unlocking direction, it reaches the unlocked position by the spring force of the first spring member 7. The second spring member 8 is compressed, and its spring force delays the operation timing, and the second lock member reaches the unlocked position.

Thus, by providing the first spring member 7, the operating force at the time of locking or unlocking operation may be small, and the first locking member 5 can be operated by interposing it in the middle of the connecting rods 53 and 62. Then, the operation timing of the second lock member 6 is delayed and reaches the lock position or the unlock position. Therefore, since it is not necessary to match the timings of both the lock members 5 and 6, a large amount of operating force is not required, and the both lock members 5 and 6 can be smoothly operated by one operation.
6 is locked or unlocked.

[First Embodiment] In Figs. 1 to 3, a quadrangular lower frame 1 and an upper frame 2 are arranged in parallel at upper and lower intervals, and the lower frame 1 is fixed to a vehicle floor F. . The upper frame 2 includes front and rear parallel link mechanisms 3
The link mechanisms 3A and 3B are supported on the lower frame 1 by A and 3B, and each of the link mechanisms 3A and 3B has an inclined link arm 31 formed of a frame body and a sub arm 32 connected to one side surface of the link arm 31. One end of each of the torsion bars 4A and 4B, which are located on the lower frame 1 and whose both ends are twisted, is connected to each of the sub-arms 32 so as to apply a supporting force to the link arm 31.

A shock absorber 33 is arranged between the lower frame 1 and the connection point between the link arm 31 of the link mechanism 3A and the upper frame 2.

A lock plate 5 is provided at the front end of the lower frame 1. The lock plate 5 has a long plate shape, the lower end of which is rotatably pivotally attached to the lower frame 1 and laterally protrudes to the upper part of the plate surface. An operating lever 51 is provided for the operation.

The details will be described with reference to FIG. 4. A notch 52 is formed rearward at the upper end of the lock plate 5, and as shown in the drawing, the notch 52 is formed in the plate standing state which is the lock position.
Engages with a locking rod 21 provided on the upper frame 2 to restrict the movement of the upper frame 2. A coil spring 7 is provided between the upper portion of the lock plate 5 and the lower frame 1.
The coil spring 7 biases and holds the lock plate 5 in the lock position, and the biasing direction is changed during the operation of the lock plate 5 to the sideways state (chain line in the figure) which is the unlocked position. The plate 5 is turned over to hold the plate 5 in the unlocked position.

In FIGS. 1 and 3, lock plates 6 are provided at left and right positions on the rear end of the lower frame 1 near the link arm 31 of the link mechanism 3B, and these lock plates 6 operate simultaneously. The details will be described with reference to FIG. 5. The intermediate portion of the lock plate 6 is rotatably attached to the lower frame 1, and the upper end surface of the lock plate 6 in the standing state has the link arm 31.
The lower side surface of the link arm 31 is brought into contact with the lower side surface of the link arm 31 to restrict downward movement of the link arm 31.

One end of a rod 62 is locked in a hole 61 provided at the lower end of the lock plate 6, and a rod 53 extending from the lock plate 5 is connected to the other end of the rod 62 by a coil spring 8. .

The spring force of each of the coil springs 7 and 8 is set so that the coil spring 8 is smaller than the coil spring 7.

In the seat suspension device having the above structure, when the vibration frequency of the input vibration during traveling on a rough road is close to the natural frequency of the device and the seat shakes relatively greatly due to resonance and the riding comfort deteriorates, the lock plate 5 is erected. Rotate toward the lock position of. Even if the lock plate 5 is released, the lock plate 5 is urged to the lock position by the spring force of the coil spring 7, and when the front end of the vertically moving upper frame 2 reaches the predetermined position, the cutout of the lock plate 5 is formed. 52 and the locking rod 21 are engaged with each other to regulate the vertical movement of the upper frame 2.

In this state, the coil spring interposed between the rods 53 and 62 is pulled, and the lock plate 6 moves to the coil spring 8
When the link arm 31, which is oscillated with the vertical movement of the rear end of the upper frame 2, reaches a predetermined position, the link arm 31 comes into contact with the lower side of the link arm 31 and swings downward. Block.

Thus, when traveling on a rough road, the movement of the upper frame 2 is restricted by the front and rear ends thereof, and as a result, the seat swing is suppressed well and the riding comfort is prevented from being deteriorated.

After passing the rough road, the lock plate 5 is laid down to the unlocked position. The operation to the unlocked position can be performed with a small operation force because the biasing force of the coil spring 7 is reversed during the operation to bias the lock plate 5 toward the unlocked position.

With the above operation, the rod 53 is pushed and the coil spring 8 is compressed. Then, when the link arm 31 swings slightly upward due to vibration or the like, the lock plate 6 pushes the rod 62 by the spring force of the coil spring 8, and the operation timing is delayed to the unlock position as shown by the chain line in FIG. And lie down.

In this way, by providing the coil spring 8 in the middle of the connecting rods 53 and 62 that connect the lock plates 5 and 6, even if the operation timings of the lock plates 5 and 6 are different, it is possible to reliably perform the upper operation by one operation. The front and rear ends of the frame 2 can be locked or unlocked. Moreover, since the operation timing is different, a large operation force is not required.

According to the present embodiment, since the force greater than the spring force of the coil spring 8 is not applied to the rod 53 and the rod 62, the rod strength may be relatively small.

[Second Embodiment] The shape of the lock plate 6 provided at the rear end of the upper frame may be the same as that of the lock plate 5, which is shown in FIG. In the figure, the lock plate 6 engages with the locking rod 22 of the upper frame 2 through the notch 62, and is in a locked state.

With such a structure, the same effect as that of the above-described embodiment can be obtained.

[Third Embodiment] The structure shown in FIGS. 7 and 8 may be adopted. In such a structure, when the lock plate 5 is operated in the lock position direction, the coil spring 8 is compressed, and the spring force delays the operation timing to lock. When the plate 6 reaches the lock position and the lock plate 5 is operated toward the lock release position, the coil spring 8 is pulled and the lock plate 6 is released.
The operation timing is delayed by the spring force of the coil spring 8 to reach the lock release position.

Also in this embodiment, the same effect as each of the above-mentioned embodiments is obtained.

The lock plate 6 may have the structure shown in FIG.

It goes without saying that the structures of the first to third embodiments can be applied to a suspension device of a type in which the upper frame 2 and the lower frame 1 are supported by the X link mechanism.

[Advantages of the Invention] As described above, in the vehicle seat suspension device of the present invention, the lock members provided at both ends of the device can be operated with a light operating force and a one-touch operation.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention.
The figure shows the overall side view of the suspension device, FIG. 2 shows the overall front view thereof, FIG. 3 shows the overall plan view thereof, FIG. 4 shows a schematic enlarged side view of the front end part of the suspension device, and FIG. 5 shows the rear end part of the device. FIG. 6 is a schematic enlarged side view, FIG. 6 is a schematic enlarged side view of a rear end portion of a suspension device showing a second embodiment of the present invention, FIGS. 7 and 8 show a third embodiment of the present invention, and FIG. Is a schematic enlarged side view of the front end of the device, FIG. 8 is a schematic enlarged side view of the rear end of the device, and FIG. 9 is a schematic enlarged side view of the rear end of the device showing another structure of the lock plate. 1 ... Lower frame, 2 ... Upper frame, 3A, 3
B ... Link mechanism, 31 ... Link arm, 4A, 4B
...... Torsion bar (bearing force spring member), 5 ... Lock plate (first lock member), 6 ... Lock plate (second lock member), 7 ... Coil spring (first spring member), 8 ... Coil spring (Second spring member), F ... Vehicle floor, 53, 62 ... Connecting rod

Claims (1)

[Scope of utility model registration request] 1. A lower frame fixed to a vehicle floor,
An upper frame disposed above the lower frame for mounting a vehicle seat, a link mechanism for connecting the upper frame to the lower frame so as to move up and down while maintaining a horizontal posture, and an upper frame support for the link mechanism. In a vehicle seat suspension device including a supporting spring member for applying force, the vehicle seat suspension device is brought into contact with one of the upper frame and the lower frame or a link arm that constitutes a link mechanism at a lock position, and the upper frame and the lower frame are respectively contacted. A first lock member and a second lock member that restrict the relative movement of one end and the other end of the frame, and the first lock member that is provided in the first lock member, and the biasing direction is reversed during the operation, and the first lock member A first spring member for urging the lever toward the lock position direction and the lock release position direction;
A connecting rod connecting the lock member and the second lock member,
A second member which is interposed in the middle of the connecting rod and acts in both compression and tension directions and which has a smaller spring force than the first spring member.
A vehicle seat suspension device including a spring member.