JPS5920490B2 - Seats, especially vehicle seats, with a seat height adjustment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a height adjustment device for a seat, and more particularly, a support lever that constitutes a part of the height adjustment device and swings as the seat moves up and down, using at least one support spring. The present invention relates to a seat, particularly a vehicle seat, having a height adjustment device for a seat portion supported by a seat.

2. Description of the Related Art Various devices are known as height adjustment devices for seats in general, particularly for the seat portion of a driver's seat.

However, the general configuration of these devices
They are either attached to a seat substructure that has a spring action or are attached below the seat substructure; in the latter case, the overall height of the seat itself is too high, so it may not be possible to use it.

Furthermore, it is well known that in order to adjust the height of the seat portion of a driver's seat having a scissor-shaped lower structure, the angle of two scissor-shaped arms is changed, and this installation also has the effect of changing the inclination. It is also intended to.

In order to set the different angles, complex devices are generally used in each case, which on the one hand makes the production of the undercarriage relatively expensive and on the other hand increases various problems.

Moreover, accurate adjustment of the driver's seat, especially while driving, is generally difficult.

In fact, conventional devices require that a lever must be constantly operated in order to adjust the height of the driver and seat of a vehicle, such as a bus or a truck, and that this lever is only activated when the driver pays particular attention to the colbar. I can find it.

This is generally very dangerous. The basic object of the present invention is to provide a seat having a height adjustment device, which is a part of the seat undercarriage and can be easily adjusted even to a low height, and furthermore, the manufacturing cost can be kept low. In particular, the object is to provide a seat for a vehicle.

Another object of the present invention is to provide a seat that can be adjusted so that the driver's seat can be adjusted at least in one direction during driving, if circumstances permit, without special levers or the like to be operated for height adjustment and without endangering safe driving. It is to design.

To achieve this objective in a seat of the type mentioned at the outset, the invention presents the following idea.

That is, the height adjustment device includes a support lever, a connecting element, a fixing device, etc., and when the angle between the supporting lever and the connecting element changes for height adjustment, the fixing device is configured to maintain the changed angular position. is fixed.

And in addition to the above configuration.

The basic idea behind the spring device that supports the seat load is to select a location where the point of action of the support spring for vehicle seats, which is widely used everywhere, changes in response to changes in the height of the seat. It is in the point of doing.

Furthermore, it is clear that the height adjustment device can be manufactured easily and inexpensively by making the support lever a simple lever structure and by employing a spring mechanism for coupling with the connecting element.

Support levers are provided for construction in all cases.

As a development of the idea of the invention, in order to make the adjustment of the seat height effective without special levers, the seat part is raised from its lower end position and in several angular positions when it reaches its upper end position. Provision is made for the use of a locking device that automatically engages in the locking position and sets itself in a remote position such that the lower part of the seat section moves as far away from the lower end as possible and automatically sets itself back into the locking position. ing.

Thus, if a higher seat is desired according to the present invention, the seat can be simply lifted gradually and the locking device engaged in different positions, whereas if a lower seat is desired, the seat can be raised once to the upper end and the locking device can be fully engaged. without, lower the seat completely to the lowest position.

The seat remains in a lower position and the fixing device is again operational, while it is also possible to set the desired height by lifting it into the desired position.

Furthermore, it is conceivable to have both structures, allowing for a continuously variable fixation, which can also be applied to the height adjustment of the stage, especially since this type of adjustment is sufficient for various cases.

In the embodiment particularly proposed by the invention, the locking device acts on the toothed segments, on the detents which are interlocked with the toothed segments and are pushed elastically into the engaged position, and also on the detents in the upper end position of the seat part. It has a non-meshing element that prevents the toothed segment from meshing with the detent and is removed from the detent again at the lower end position of the seat portion by means of a stud provided in the bearing portion of the toothed segment. There is.

A particularly simple form of construction of the height adjustment device according to the invention is such that at least one transmission lever is provided coaxially with the support lever and is moved in response to the movement of the seat, which acts as a coupling element, and is mounted on the support lever. Obtained when bearing on the free end of the toothed segment in conjunction with the detent.

In order to achieve a balanced and reliable operation, two transmission levers are preferably installed, the transmission levers having to be placed on either side of the support lever.

It would be convenient if a non-meshing plate having a surface facing the detent was installed between the support lever and the transmission lever,
The non-meshing plate is swingably attached to the support lever on the rear side opposite to the facing surfaces and has an opening, and the stud of the transmission lever is inserted into the opening, and the stud is inserted into the seat part. The non-mating plate engages with the detent when it meets the mating surface on one side of the opening at the upper end position, and the non-mating plate engages with the detent when the stud meets the mating surface on the other side of the opening at the lower end position of the seat section. The stud is movable within the opening such that it disengages from the detent and disengages from the detent.

This type of non-interlocking plate can be easily manufactured using a punching method.

Two further studs or pins actuate the non-mating plates;
Moreover, it is required only to support non-interlocking plates.

That is, one on the transmission lever and one on the support lever as described above, and the device is of very simple design.

For the purpose of lifting the seat part, the end of the detent and the teeth interlock with the toothed segment in order to avoid the detent being separated from the toothed segment and to nevertheless allow the detent to be easily removed. The flanks corresponding to the teeth of the die segment are chamfered on each side and are provided to automatically disengage the detent from the die segment when the tooth segment and the detent are moved in a certain direction. There is.

As already mentioned, the transmission levers with toothed segments are preferably mounted on both sides of the support lever.

In this case, the detent is formed as a bar extending through an opening in the support lever.

In order to mount the detent in a simple manner with such a design, and nevertheless to obtain a constant and symmetrical action on the two transmission levers, one end acts close to both ends of the detent and the other Preferably, two tension springs, one end of which is attached to the transmission lever, move the detent into a position in which it engages the toothed segment.

When the height adjustment device according to the invention is used in a seat with a steel substructure, it can act as a bearing shaft for the support lever and the transmission lever (at the point where the shaft articulates with the seat frame, etc.) Preferably, one arm of the scissors is rigidly connected to the corresponding arm of the other scissors, and the support lever or transmission lever is rotatably mounted on the shaft.

The overall height adjustment device is basically a support lever, a detent,
It consists only of a transmission lever, a toothed segment and a spring.

Moreover, if the above-mentioned simple operation is aimed at, the non-interlocking plates must be mounted in a special design.

In the case of iron substructures, a very simple construction is obtained in this way, and the design advantages obtained with iron substructures are retained.

When the invention is applied to a seat substructure with iron arms, a cam is provided at the free end of the support lever so that the elastic force of the support spring acts on the surface of the cam via a sliding element running along the frame. and the rocking moment generated in the support lever as a result causes the iron arm to extend via the fixing device and the connecting element.

If a support lever with a cam is provided on the iron substructure as described above, the support spring can be placed almost horizontally,
This has the advantage that the height of the seat can be set low.

Furthermore, the design of the spring device is very simple compared to known ones.

In fact, in order to transfer the force from the spring to the iron substructure, essentially only a sliding element connected to the spring, a support lever moving together with the substructure as well as one or more transmission levers are required.

Another advantage of the design of the spring arrangement in the seat according to the invention is that it reduces the spring force which would otherwise be excessively increased, for example when the steel substructure is further loaded, to a relatively small spring force in order to obtain a very well-defined spring characteristic. However, the running cam may be configured in various ways so as to act on the first section of the interlocking passage.

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 section'') 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 pivoted to the five-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 scissor arm 5, 5'6, 6', bearing T.

8, rollers 9, and guides 10, 11 is well known per se, so a detailed explanation of the positions of each component will be omitted here.

In particular, Figure 1 clearly shows the following.

a pair of scissor arms 5, 5 connected to a bearing point 7;
Each end 12 of ' is interconnected by a shaft 13 formed by a tube.

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

In this way, the two scissors formed by arms 5, 6 and 5', 6'K move simultaneously.

A shock absorber 1 is provided between the floor frame 1 and the support frame 20 to reduce the shock that occurs while 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 mutual spring effect 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 or the like on the floor frame 1 (see FIG. 1), and the other end of each tension spring 18 is attached to a nut 21 on a threaded spindle 22.
The bearing block 20 is mounted on both ends of a hair ring block 200 such that rotation of the bundle 230 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, through which the threaded spindle 22 extends.

The filament spindle 22 has, at its end remote from the bundle 23, 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 two rollers disposed on both sides of the support roller 300 and having a larger diameter than the support roller 30. The guide rollers 31 are attached.

It is emphasized that the support roller 30 and guide roller 31 can freely rotate in relation to each other.

The guide roller 31 rotates on the floor frame 10 base 32, and the support roller 30 rotates on the guide roller 31.
Because of its smaller diameter, it is held a fixed distance above the base 32 and can rotate freely.

Accordingly, it is clear from the drawings and in connection with the foregoing description that the support roller 30 is pushed by the tension spring 18 via the fork 28, the filament spindle 22 and the bearing block 20 toward the shaft 13, that is, to the left in FIG. be.

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 has a running surface (running cam) 33 at the free end of the scissor arm 30 (FIGS. 2 to 4).
It is rotatably mounted on shaft 13 in conjunction with.

By the way, 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 cannot be used for height adjustment as described below.

In order to explain the basic principle of how to operate the spring structure in the seat configuration or in the seat substructure, we will explain the above-mentioned case where the support lever 34 is fixed to the shaft 13. In this kind of design, the support roller 30 is
The tension spring 18 pushes the support lever to the left in the drawing.
340 acting on the running surface 33, it is lifted to the position shown in solid lines in FIGS. 2 to 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 portion 3 in the direction of arrow 35 in FIG. 2, 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 transfer movement of the fork 28 is caused by the striated spindle 22.
to the bearing block 20, the engagement point 38 of the tension spring 1B is also transferred accordingly, and the tension spring 18 is tensioned due to the load applied in the direction of the arrow 35.

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 (as it requires a large space to be mounted parallel to the seat).

As already mentioned, during the spring action the filament 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, as shown in FIG. It is not fixed to the shaft 13, but is rotatably attached to the shaft 13 in a loose manner, and the shaft 1
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 a support lever 340, 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 is differentially connected to the scissor arms 5, 5', 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. .

On the other hand, as shown in FIG.
, 5' take a large angle with respect to the base 32 of the floor frame 10 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 portion 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 390, and the tension of the spring moves the support roller 30 to the right side in the figure. .

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 swings in the direction of the arrow 48 so that the detent 42 automatically moves away from the teeth of the tooth profile segment 410 of the individual teeth. 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 410 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 for lowering 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
There is a pin 54 connected to the support lever 34 as shown in FIG.

Further, the non-meshing plate 50 has openings 54 into which stud bolts 55 of the transmission lever 39 are fitted.

The front end 56 of the non-meshing plate 50 is sloped as shown in the drawings and is bent at its lower end to form a mating surface 5T 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 can be difficult due to its very simple design (and low cost). You can do it with

Next, embodiments of the present invention are shown below.

l) When the seat part is lifted from its lower end position and reaches the upper end position, it automatically engages in the fixed position in several angular positions, the lower part of the seat part moves away from the lower end as much as possible and then returns to the fixed position. A seat according to the claims, characterized by a fixing device that sets itself in a remote position so as to automatically set itself to a seat.

2) The fixing device engages the toothed segments, the detents that interlock with the toothed segments and are elastically pushed to the engaged position, and further acts on the detents at the upper end position of the seat to engage the toothed segments and the detents. and a non-meshing element that prevents the tooth from moving and is released from the detent again at the lower end position of the seat part by means of a stud or the like provided in the bearing part of the toothed segment. Seat according to aspect l.

3) at least one transmission lever is provided coaxially with the support lever and is moved in response to the movement of the seat, acting as a coupling element, and is connected to the free end of the toothed segment in conjunction with a detent mounted on the support lever; Seat according to claims and embodiments 1 and 2, characterized in that it is bearing.

4) A non-meshing plate having a surface facing the detent is installed between the support lever and the transmission lever, and the non-meshing plate is swingably attached to the support lever on the rear side opposite to the facing surface,
It has an opening for inserting the stud bolt of the transmission lever, etc. When the stud bolt seats at the upper end position and meets the mating surface on one side of the opening, the non-meshing plate engages without returning. Make sure that the stud is movable within the opening so that the non-mating plate does not engage with the detent (Fig. 4) and disengages from the detent when mating with the mating surface on the other side of the opening at the lower end position of the part. Seat according to the characterized claims and embodiments 1-3.

5) The end of the detent that interlocks with the tooth segment and the flank corresponding to the tooth of the tooth segment are chamfered on one side, so that the detent automatically moves when the tooth segment and the detent move in a certain direction. Any one of embodiments 2 to 4, characterized in that the tooth pattern segment is made to dislodge from the tooth segment.
Seating by one.

6) Any one of the embodiments 3 to 5, characterized in that the transmission lever with toothed segments is mounted on both sides of the support lever, and the detent is formed in a rod-shaped body extending through an opening in the support lever. Seat by.

7) Embodiment 6, characterized in that the detent is moved into the position of meshing with the toothed segment by means of two tension springs, one end of which acts near the ends of the detent and the other end of which is attached to the transmission lever. Seat by.

8) One arm of a pair of scissors is rigidly (connected) to the corresponding arm of the other scissor at the point where it is articulated to the frame of the seat etc. by a shaft which serves as a bearing axis for the support lever and the transmission lever. or the seat according to any one of embodiments 3 to 7, characterized in that the transmission lever is rotatably attached to the shaft, and has a structure formed by two pairs of scissors having two arms that intersect with each other. .

9) The support lever has a running cam at the free end of the support lever that acts on a sliding element movably mounted on the frame, etc., and the sliding element is moved against the running cam by a support spring held on the frame. 9. A seat according to any one of claims and embodiments 1 to 8, characterized in that when a force is applied to the seat portion and a load is applied to the seat portion, the support spring is pulled and moved by the shape of the traveling cam.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the lower structure of the vehicle seat of the present invention, Fig. 2 is a side view thereof, Fig. 3 is a side view when the height position in Fig. 2 is changed, and Fig. 4 is a further height It is an enlarged explanatory side view when the position is changed. In the figure, numeral 3 indicates a seat, 18 a support spring, 34 a support lever, 39 a transmission lever, 41 a toothed segment, 42 a detent, and 50 a non-meshing plate.

Claims (1)

[Claims] 1. A seat having a seat lower structure configured to support a seat load support support frame on the floor via arms forming a link structure, and to move the frame up and down while holding the frame substantially parallel to the floor; In particular, in a vehicle seat, at least one connecting element is firmly attached to an appropriate position of the lower structure so as to be parallel to a plane including the arm, and is configured to be able to swing as the support frame moves up and down. , a support lever configured to be swingably attached around a swing axis of the connection element and configured to produce an angular deviation between the connection element and the support lever; 1. A seat, in particular a vehicle seat, having a height adjustment device for a seat section, characterized in that it comprises a fixing device that automatically engages in an angular position and a spring device for supporting the seat load that biases the support lever.