JPS5919853B2 - Spring device integrated into a scissor-shaped undercarriage for seats, especially vehicle seats - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spring device integrated into a scissor-shaped undercarriage for a seat, in particular a vehicle seat.

The lower structure of a seat usually consists of a pair of extensible scissor-shaped arms that raise and lower the seat support frame that supports the seat while holding it approximately parallel to the floor frame, and a spring device that supports the seat load. , the pair of scissor-shaped arms are connected by a rigid member extending laterally through corresponding portions of each arm.

Each mutually intersecting scissor arm is then articulated at one end with one of the frames, while the other end is slidably guided on the other respective frame, approximately parallel to its plane.

Seats with scissor-shaped lower structures, especially driver seats,
In order to provide the seat with a sufficiently thick padding, but without raising the seat too high, it is often required to keep the overall height of the undercarriage as low as possible.

At the same time, and for the driver's seat, consideration must be given in such cases to allow sufficient spring extension (usually at least 80 G).

Furthermore, the possibility of a height adjustment of at least 60 mm must be considered for the driver's seat.

Finally, it should be mentioned that very often the undercarriage of the driver's seat is additionally mounted on a rail that allows the seat to be moved longitudinally towards the vehicle's control bundle, etc. be.

In known seats with rigid substructures, torsion rods have generally been used for spring purposes.

In this case, these torsion rods are mounted centrally on the floor frame or support frame, each end of which engages each end of a mutually corresponding iron arm with two iron threads mounted on either side of the iron substructure. ing.

In this way, a sufficient spring displacement is obtained for the low overall height of the steel substructure, and furthermore it is possible to adjust the seat height accordingly.

However, mounting a torsion rod as a spring element is associated with a number of disadvantages.

First, it is difficult to obtain a torsion rod with appropriate performance at a low cost.

Second, adjustment of the spring cord characteristics is essential for high-performance driver seats, but this adjustment must be done at the part where the torsion rod is attached to the frame, making the structure complicated and cumbersome. be.

Driver seats with a rigid undercarriage are also already known in which a torsion spring or compression spring is used instead of a torsion rod.

However, in these known seats, a relatively sophisticated mechanism essentially serves to transmit the movement of the scissors to the springs.

Moreover, it is not guaranteed that the seat will meet all requirements, in particular with regard to the possibility of adjusting the spring force.

The basic object of the present invention is to provide a seat which is designed to be incorporated into a regular substructure and which makes it possible to minimize the overall height of the regular substructure at low manufacturing costs.
In particular, the object is to provide a spring device for a driver's seat.

Of course, other conditions must also be met in the spring device according to the invention.

Other conditions include sufficient spring extension or deviation, the possibility of satisfactory adjustment of the tongue spring force to adapt to the weight of the vehicle,
There is also the possibility of incorporating a height adjustment of at least 60 mm in order to adapt to different vehicle body sizes.

In order to solve this problem in spring devices of the type mentioned at the beginning, the present invention proposes the following idea.

That is, a support lever is firmly attached to an appropriate position of the lower structure parallel to the plane containing the iron law arm, so that the support lever swings as the arm expands and contracts, and either the seat support frame or the floor frame A sliding element is provided which moves along one side and in the oscillating plane of the support lever and is biased by a spring so as to press against the surface of a cam provided at the free end of the support lever.

Therefore, when the height of the support frame is reduced due to the seat load, the shape of the cam causes the sliding element to move and tension the spring.

In addition to the above-mentioned configuration, the spring is configured based on the following basic concept.

That is, the spring is installed horizontally to save space in the height direction, and the elastic force of the spring is transmitted to the cam surface of the support lever through the sliding element, causing the support lever to swing and extend the iron law arm. Make it.

This principle of spring device construction provides primarily the following advantages:

In other words, even if the overall height is low, the spring can expand relatively greatly.

Furthermore, the configuration is extremely simple. All that is needed to transmit the force from the spring to the ironwork is a sliding element, which is connected in some way to the spring and must of course be guided to a certain extent, as well as a support lever which is received together with the workpiece.

In the simplest construction, the support lever can be welded directly to one of the scissor arms.

A second advantage of the spring device according to the invention is found in the following points.

That is, the running cam can of course take on various forms in order to thus obtain a very well-defined spring characteristic.

For example, in order to have a relatively small spring force acting during the first part of the movement stroke, this spring force increases progressively when the steel substructure is deflected to a significant extent.

However, no particularly expensive equipment is required for this variation in spring performance.

It is particularly advantageous if the supporting lever is a straight lever arranged approximately parallel to the scissor arm and the sliding element can be moved in a plane approximately parallel to the scissors.

The spring device according to the invention makes it possible in a simple manner to adjust the height of the support frame at the seat with respect to the floor or base frame in a fully extended or fully retracted position, in which case: There are conditions.

That is, the support lever is mounted oscillatably on the shaft almost perpendicular to the associated scissor arm, and the support lever is connected to the scissor arm through a connecting element providing means for adjusting various angles between the scissors arm and the support lever. The structure is such that they are connected.

The ease with which these different angles can be employed (e.g. by means of locking devices, etc.) does not require further explanation.

Particularly low overall heights are obtained when the sliding element can be moved almost parallel to one of the frames.

According to the invention, it is only through the point of action of the support spring on the sliding element that a change in the initial tension of the spring and thus an adaptation to different weights of the body can be realized.

It should be noted that the sliding element can be adjusted to vary the effective spring force.

Furthermore, it is preferred that the sliding element be mounted on one end of the wired spindle for axial movement about its axis.

The wired spindle then projects through a hole in one of the frames and is rotatable by a bundle fixed at the other end.

The other end has a bearing block that axially moves on the spindle as the spindle rotates and engages with one end of the support spring.

The other end of the support spring is attached to each bearing point on the frame where the hole is located.

If the bundle has an appropriately sufficient diameter, the hole and the corresponding part of the frame can in such case act as a stop for limiting the movement of the wired spindle by the action of the support spring.

It is advantageous to provide a hole in the end flange of the frame, in which the bundle lies outside the frame and is therefore easily accessible.

When using a spring device, for example when driving a car, one must expect an axial displacement of the lined spindle and therefore also a protrusion of the bundle to different distances beyond the frame. It is true that it must be done.

However, this is not necessarily a disadvantage.

This is because the periphery of each frame is typically mounted a considerable distance rearward relative to the seat area.

According to the invention, a particularly satisfactory and easy actuation of the spring device is obtained if the sliding element is a rotatably mounted supporting roller in the form of a fork or the like.

In that case, the running surface of the support lever rotates on a sliding element and there is no need to overcome the naturally occurring rips.

In order to ideally guide the sliding element, it is proposed that at least one further guide roller located on the guiding surface is connected to the sliding element.

If the sliding elements are support rollers, it is advantageous to mount guide rollers of larger diameter coaxially and freely rotatable on both sides of the support roller.

In that case, each guide roller rotates on a guiding surface, which guiding surface is preferably formed by a plate with a supporting spring and a sliding element when the supporting roller is displaced laterally on its axis.

The present invention further provides the following.

That is, the support spring is constituted by two tension springs, and the two tension springs are substantially parallel to the direction of movement of the sliding element, and the end of the support lever supporting at least the running surface between the two tension springs. Then, the sliding element is installed.

The advantage of using two parallel support springs is that a symmetrical actuation on the sliding element is easily achieved.

This is particularly advantageous when the sliding element is mounted on a threaded spindle and the bearing block for one end of the support spring is displaced axially by rotation of the spindle.

Finally, the pair of scissor arms connected to the support lever are the points of articulation to the frame, by means of a shaft that acts as a bearing axis for the support lever, and, if necessary, the connection between the pair of scissor arms that connect the support lever. It is also within the scope of the present invention that the elements be rigidly connected to each other.

Other features, advantages and details of the invention will become apparent from the following detailed description of the invention, taken in conjunction with the drawings.

The lower structure of the seat shown in the figure consists of a floor frame (or base frame) 1 that will be fixed to the chassis of the vehicle.
, a support frame 2 (indicated by dotted lines in FIG. 1),
and a seat main body (hereinafter simply referred to as "seat") 3 fixed to a support frame 2.

The floor frame 1 and the support frame 2 are interconnected by two scissors formed by two mutual scissor arms 5, 6 and 5', 6', respectively.

The connecting arms 5, 6 and 5', 6' are axially connected by connecting bolts 4, and the ends of the inner scissor arms 5, 5' forming the pair of scissors on the left side of the figure are each mounted on a bearing 7. It is pivotally connected to the floor frame 1 at a point.

Also on the outer scissor arm 6.6', said arm 5,5
Each end corresponding to the connecting end of ' is connected to the support frame 2 through eight bearings.

The support frame 2 is formed of a plate, for example.

The scissor arms 5, 5' and 6, 6' are arranged in such a way that the angle between them can be varied in order to raise and lower the support frame 2 almost parallel to the floor frame 1.
The other end of 6' is provided with a roller 9 movable along a guide 10 on the floor frame 1 and a guide 11 on the support frame 2 parallel to its main plane.

The above-mentioned iron substructure consisting of the scissor arms 5, 5', 6, 6', the bearings 7, 8, the rollers 9, and the guides 10, 11 is well known per se, so a detailed explanation of the positions of each part will not be given here. Omitted.

In particular, Figure 1 clearly shows the following.

A pair of scissor arms 5, 5 connected to the bearing point γ
Each end 12 of ' is interconnected by a shaft 13 formed by a tube.

That is, the scissor shaft 13 is fixed, and more particularly welded, to each end 12 of the scissor arm at 14 at each end of the shaft.

Thus arms 5, 6 and 5'. The two scissors formed by 6' are adapted to move simultaneously.

A shock absorber 1 is installed between the floor frame 1 and the support frame 2 to reduce the shock caused by driving over potholes, etc. on the road.
5 is pushed in.

One end of the buffer 15, for example 16, is connected to the floor frame 1, and the other end 17 is connected to the support frame 2.

In this embodiment, two tension springs 18 arranged parallel to each other in the area of the floor frame 1 serve to impart a reciprocal spring action to the floor frame 1 and the support frame 2.

In that case, one end of each tension spring 18 is attached to a stud 19 on the floor frame 1 (see Figure 1), and the other end of each tension spring 18 is attached to a bearing block with a nut 21 on a wire-containing spindle 22. It is connected to both ends of 20,
The rotation of the bundle 23 causes the bearing block 20 to move along the spindle 22 as indicated by arrow 24.

The tension spring 18 can be easily understood in this manner.
The initial tension of is varied to accommodate different weights on the seat part 3.

In order to stop the extension of the tension spring 18, a collar 25 of the bundle 23 is supported on the end flange 26 of the floor frame 1 so that the wired spindle 22 extends through a hole in the flange 26.

At its end remote from the bundle 23, the line re-entering spindle 22 has a fork 28 rotatable about a longitudinal axis 27 of the spindle 22.

A spindle 29 is provided near the front end of the leg of the fork 28, and the spindle 29 includes a freely rotatable support roller 30 and a spindle 29 disposed on both sides of the support roller 30 and having a larger diameter than the support roller 30. Two guide rollers 31 are attached.

It should be emphasized that the support roller 30 and the guide roller 31 are freely rotatable in relation to each other.

The guide roller 31 rotates on the base 32 of the floor frame 1, and the support roller 30 rotates on the base 32 of the floor frame 1.
Because of its smaller diameter, it is held a certain distance above the base 32 and can rotate freely.

It is therefore clear from the above description and from the drawings that the support roller 30 is pushed by the tension spring 18 via the fork 28, the wired spindle 22 and the bearing block 20 towards the shaft 13, that is to the left in FIG. .

The running surface (running cam) 33 at the free end of the support lever 34 acts on the support roller 30 (Figs. 2 to 4), and the support lever 34 is connected to the end 12 of the scissor arm 5, 5' as shown in the embodiment.
It is rotatably mounted on shaft 13 in conjunction with.

It should be pointed out that a configuration in which the end of the support lever 34 remote from the running surface 33 is fixed to the rotatable shaft 13 is easily conceivable and is not used for the height adjustment described below.

In order to explain the basic principle of how the spring structure operates in the seat configuration or in the seat substructure, we will discuss the case where the support lever 34 is fixed to the shaft 13 as described above. In this type of design, the support roller 30 teeth,
The tension spring 18 pushes it to the left in the drawing, acts on the running surface 33 of the support lever 34, and lifts it to the position shown in solid lines in FIGS. 2-4.

When the support lever 34 is fixed to the shaft 13, the scissor arms 5, 5' also move in the same direction via the shaft 13 under the action of the tension spring 18, and the support frame 2 assumes the upper end position.

If a load is applied to the seat part 3 in the direction of arrow 35 in the second figure, the support lever 34 will be lowered in the direction of arrow 36 and guided to the bottom position as shown by the dashed line in FIG. .

In the process of lowering the support lever 34 in the direction of the arrow 36, the fork 28 is moved to the right side of the drawing (in the direction of the arrow 37) due to the interlocking action of the support roller 30 and the running surface 33.

This relocation movement of the fork 28 is caused by the wired spindle 22.
to the bearing block 20, the engagement point 38 of the tension spring 18 is also correspondingly transferred, and the tension spring 18 is tensioned due to the applied load in the direction of the arrow.

The position to which this support roller 30 has moved is shown in FIG. 2 by a dashed line.

It is easy to see that the nature of such a spring can be varied to adapt to different operating conditions by deforming the curve of the running surface 33 at the free end of the support lever 34.

Furthermore, when this type of spring is used, the spring is attached to the floor frame 1
The seat substructure can be constructed very low since it requires a large space to be installed parallel to the seat.

As already mentioned, during the spring action, the line re-spindle 2
I would like to take this opportunity to once again point out that 2 moves in the direction of arrow 24.

The bundle 23 also moves in relation to the spindle 22, i.e. projects more or less beyond the end flange 26 of the floor frame 1, and its movement can be expected to be rhythmic with the vibrations of the seat part 3.

This situation does not interfere with operation since the seat portion 3 normally projects far beyond the end flange 26, as shown in FIG.

However, the support lever 34 of the present invention is not fixed to the shaft 13 as described above, but is rotatably attached to the shaft 13 in a loose manner.
3 is fitted with a coupling element for transmitting the rotational movement of the scissor arms 5, 5' to the support lever 34.

That is, in the present invention, two transmission levers 39 are installed on both sides of the support lever 34, and the shaft 13 is connected by a member 40 (see especially FIG. 4) acting as a connecting element.
installed on.

These transmission levers 39 have toothed segments 41 at their free ends, the toothed design of which is particularly clear in FIG.

The detent 42, which passes through the bore 43 of the support lever 34, is substantially rod-shaped and interlocks with the toothed segment 41.

The detent 42 is pulled in the direction of the toothed segment 41 by a tension spring 44 attached to both ends thereof and placed outside the transmission lever 39 .

A pin 45 is attached to the transmission lever 39 to secure the end of the tension spring 44.

With the aid of the locking device formed by the detent 42 and the toothed segment of the transmission lever 39, the transmission lever 39 as well as the scissor arms 5, 5' are connected, as can be seen by comparing FIGS. 2 and 3. It is possible to fix the support lever 34 in different angular positions.

When the detent 42 is placed in the upper cutout of the toothed segment 41 as shown in FIG. take.

On the other hand, as shown in FIG.
, 5' take a large angle with respect to the base 32 of the floor frame 1 in the unloaded state.

The support frame 2 is therefore at a far distance from the floor frame 1.

By engaging the detents 42 with different notches of the toothed segments 41 in this manner, the height of the seat portion 3 relative to the floor frame 1 can be adjusted.

When a load is applied to the seat part 3 in the direction of arrow 35, the support lever 34 moves in the manner described above, regardless of the angular position between the support lever 34 and the transmission lever 39, and the tension of the spring causes the support roller 30 to move to the right in the figure. Move.

The fixing device between the support lever 34 and the transmission lever 39 is designed in a special way as shown in the figure.

As clearly shown in FIGS. 2 to 4, the edge of the detent 42 that engages the toothed segment 41 is located at the lower side 46.
It is chamfered with.

When the seat part 3 is lifted by the scissor arms 5, 5', the transmission lever 39 also moves the individual teeth of the tooth profile segment 41 in such a way that the rocking detent 42 automatically moves away from the teeth of the profile segment 41 in the direction of the arrow 48. The flank 47 (FIG. 4) is also chamfered as required.

When the lifting force of the seat part 3 is released, the upper part 49 of the detent 42 is adapted to the flanks of the individual teeth of the tooth profile segment 41 on the corresponding side and is pulled into the engaged position by the spring 44.

In this way, it is only possible to lift the seat part 3 in order to fix the seat in a different position relative to the floor frame 1 in order to increase its height.

In the seat undercarriage described, two non-interlocking plates 50 are associated with the transmission lever 39 to lower the seat part 3.
is provided.

This plate is specially shaped to hold the detents 42 in a position where they cannot engage the teeth of the toothed segments 41 when the seat is lifted beyond the fixed position as shown in FIG.

The detent 42 then remains in this position until the seat part 3 as well as the support frame 2 are lowered to such an extent that the detent 42 can engage the upper notch 51 of the toothed segment 41.

As is clear from FIG. 4, the non-meshing plate 50 is
It has a slot 52 on the side facing 3, and the slot 52
As shown in FIG. 1, there is a pin 53 connected to the support lever 34.

Furthermore, the non-meshing plate 50 has an opening 54 into which a stud 55 of the transmission lever 39 is fitted.

The front end 56 of the non-meshing plate 50 is sloped as shown in the drawings and curved at its lower end to form a mating surface 57 with the detent 42.

This non-meshing plate 50 is operated in the following manner.

As long as the detent 42 is opposed to one of the notches of the toothed segment 41 of the transmission lever 39, the non-engaging plate 50 does not act on the detent 42, the position of the non-engaging plate being shown in FIG. Thus, the stud 55 is located generally at the upper end of the aperture 54.

When the support frame 2 is lifted to such an extent that the detent 42 leaves the lower limit of the toothed segment, the detent 42 runs with its chamfered corner 46 over the front end 56 of the non-meshing plate 50 and at the top of the opening 54. It is held in place by a stud 55 at the end and by a pin 53 in the slot 52.

In such a manner, the detent 42 moves to the mating surface 57 (FIG. 3) of the non-mating plate 50.

Even when the support frame 2 is lowered again, the detent 42 continues to be pressed against the joint surface 57 of the non-meshing plate 50 by the spring 44.

As a result, the non-mating plate 50 remains associated with the support lever 34 in terms of movement.

That is, since the support lever 34 is held at the upper end position shown in FIG. 3 by the support roller 30, the non-meshing plate 50 does not move.

It is noted that this upper end position is defined by the abutment surface 58 at the connecting end of the support lever 34.

During actuation of the transmission levers 39, the studs 55 connected to these levers move away from the upper end of the opening 54 and below the opening 54.

That is, it moves to the position shown in FIG.

Immediately the stud 55 acts on the bottom end of the opening 54, thereby moving the non-mating plate 50 downwardly.

As a result of this operation, the joint surface 57 of the non-meshing plate 50 is prevented from returning 4
It comes out of engagement at the tip of 2.

The detent 42 then engages in the upper notch 51 of the toothed segment 41.

This method immediately follows the location of the section shown in FIG.

The seat is fixed in the lower position without any special manual intervention required.

If the driver wishes to raise the seat to a higher position, he simply lifts the seat part 3 until a further locking action takes place between the detent 42 and one of the notches of the toothed segment.

On the other hand, if the driver desires a lower seat, the driver lifts the seat above the upper fixed position, lowers the seat completely until the detent 42 disengages, and then raises the seat again to the desired position.

Height adjustment can thus be carried out very rapidly and without special manual intervention, and furthermore, the configuration required for height adjustment is of a very simple design, resulting in little difficulty and at low cost. I can do it.

Next, embodiments of the present invention are shown below.

■) The support lever 34 is a straight lever installed parallel to the scissors arms 5, 5', and the support roller 30 moves on a plane parallel to the scissors 6, 6 and 5', 6'. A splash device according to the claims.

2) The support lever 34 cooperates with the scissor arm to move the shaft 13
It is mounted so that it swings vertically upwards,
Claim or Embodiment 1) characterized in that it is connected to the scissor arm through a coupling element 39.42 in order to adjust different angles between the scissor arm and the support lever.
Spring device by.

3) Claims and embodiments 1), 2) characterized in that the sliding element 30 moves parallel to the floor frame 1
A spring device according to any one of:

4) Point of action 38 of the support spring 18 on the sliding element 30
Claims and embodiments 1) to 3), characterized in that: is adjustable in order to vary the effective spring force.
A spring device according to any one of:

5) The sliding element 3 is attached to one end of the wire-loaded spindle for axial movement about the wire-loaded spindle's axis, and the wire-loaded spindle extends through a hole in the frame 1 and is fixed to the other end. It is rotatable by the bundle 23 and the spindle pivots on the spindle as the spindle rotates, so that one end 3 of the support spring
8 and a bearing block that engages with the supporting spring 18.
Splash device according to embodiment 4), characterized in that the other end is attached to a bearing point 19 on the frame 1.

6) Spring device according to embodiment 5), characterized in that the hole is provided in the end flange 26 of the frame 1.

7) Splash device according to any one of the claims and embodiments 1) to 6), characterized in that the sliding element 30 is a rotatably mounted support roller 30 in the form of a fork 28 or the like.

8) Spring device according to claims 1) to 7), characterized in that at least one guide roller located on the guide surface is connected to a sliding element 30.

9) Each guide roller 31 with a larger diameter is coaxially attached to both sides of the support roller 30 so as to be freely rotatable, and the support roller 30 is laterally moved on its axis 29 to be formed by the fR1 support spring 18 and the sliding element 30. The splashing device according to embodiments 7) and 8), characterized in that the guide roller rotates on a guiding surface on which the guide roller is placed.

10) The support is constituted by two tension springs that are approximately parallel to the direction of movement of the sliding element, and the end of the support lever 34 that supports at least the running surface and the sliding element 30 are attached between these two tension springs. Spring device according to any one of claims and embodiments 1) to 9), characterized in that:

11) A pair of scissor arms 5゜5' connected to a support lever
are rigidly connected to each other at the point of connection 7 to the frame by a shaft acting as a bearing shaft for the support lever and, if necessary, by a connecting element between the pair of scissor arms that articulate with the support lever. A spring device according to any one of the claims and embodiments 1) to 10), characterized in that:

[Brief explanation of drawings]

1 is a plan view of the lower structure of a vehicle seat having a spring device and height adjustment according to the present invention, FIG. 2 is a side view of the vehicle seat of FIG. 1, and FIG. 3 is a view of the seat portion of FIG. A side view when the height position is changed, and FIG. 4 is an enlarged explanatory side view when the height position is further changed. In the figure, 1 is a floor frame, 2 is a support frame, 3 is a seat, 5, 5', 6, 6' are scissor arms, 13 is a shaft, 18 is a tension spring, 30 is a support roller, 33 is a running cam, 34 indicates support levers.

Claims (1)

[Claims] 1. A support frame that supports the seat, a floor frame fixed to the floor, and a configuration in which the two frames are interconnected and the seat support frame is moved up and down while being held substantially parallel to the floor frame. A seat having a pair of extensible scissor-shaped arms and a spring device for elastically supporting the seat load, particularly a spring device incorporated in a scissor-shaped undercarriage for a vehicle seat, in which the scissor-shaped arm is installed at an appropriate position on the undercarriage. a support lever that is firmly attached so as to be parallel to a plane containing the arm and configured to be able to swing as the arm expands and contracts; and a support lever that is close to and substantially parallel to either the seat support frame or the floor frame; at least one coil spring that is attached to the frame and has one end fixed to the frame, and is supported movably along the frame to which the spring is attached and within a swinging plane that includes the support lever, and is biased by the elastic force of the spring. The sliding member is arranged so that it presses against the surface of a cam formed on the free end of the support lever, and the shape of the cam is changed so that when the scissor-shaped arm is shortened, 1. A spring device incorporated in a scissor-shaped undercarriage for a seat, in particular a vehicle seat, characterized in that the spring acts on a sliding member in tension.