DE2313008A1 - ELASTIC SUSPENSION SYSTEM FOR VEHICLE SEATS - Google Patents

Description

PATENT LAWYERS

HELMUT SCHROETER KLAUS LEHMANN

DIPL.-PHYS. D.PL.-.NG. 2313008

8 MUNICH 25 · LI POWSKYSTR. IO

Societe SIPRA td-ss-10

Ho / Lü

March 15, 1973

Elastic suspension system for vehicle seats

The invention relates to devices for the elastic suspension of the Seats of certain motor vehicles, especially the seats of agricultural tractors, tractors etc.

In particular, the invention relates to devices by which the elastic resetting or retrieval of the seat as well as the damping of seat oscillations and vibrations with the help of an or several elastic elements, preferably consisting of rubber, can be accomplished. The elastic element in shape of a ring adheres on the one hand to an inner sleeve and on the other hand to an outer ring. The inner sleeve and the outer ring are with a movable member associated with the seat and with the fixed one

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- 2 frames of the vehicle connected.

Devices of this type are generally satisfactory Suspension. The elastic return of the seat and the resilience or elasticity hysteresis of the rubber cause a some damping of vibrations and periodic oscillations on the seat.

For certain purposes, the one achieved in this way proves However, damping is considered insufficient and in certain cases it is necessary to mount a hydraulic shock absorber of the type described to be assigned, which of course increases the price of the entire unit. Damping organs of this type also harden inexpediently the suspension and change their effect according to the temperature and according to their Time of use or deployment. In fact, the characteristics of such a hydraulic damper change within wide limits in the course of a few hundred hours of use, which is why the functionality of the suspension is so disturbed or is unsuitable.

With existing mechanisms of the type mentioned at the outset, such as them are described in FR-PS 1 366 797, the seat is in use a carrier system forming approximately a parallelogram is connected to the frame of the vehicle.

If the so-called trim position of the seat remains constant, cause the displacements of such a system under the action of vertical forces cause a longitudinal movement of the seat. Associated with it is a some fatigue of the driver in the seat.

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Based on this, the object of the invention is to provide an elastic To design suspension system of the type mentioned in such a way that it is not subject to the disadvantages described. The suspension system should in particular be designed in such a way that, apart from the elastic return element designed in the form of a ring, no damping body is required.

To solve this problem, a suspension system was created, the structure of which is characterized by the features according to the characterizing part of Claim 1 characterizes.

Due to the structure according to the invention, they are from the front to the back and reverse longitudinal movements of the seat are reduced to a minimum, which is an essential factor in terms of seating comfort represents. The sliding guide of the sliding and guide plate on the back of the seat can advantageously be made from a plastic compound existing lining or any other suitable material that has a slight coefficient of friction. Thus, by the friction of the sliding plate, damping of the oscillations and vibrations of the seat can be brought about in the same way without the need for a special damping body.

The suspension system according to the invention is preferably designed in such a way that that the position of the seat can be changed not only in the longitudinal direction but also in terms of height.

The invention is described below using an exemplary embodiment Explained with reference to the accompanying drawing.

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Fig. 1 is a vertical sectional view of the suspension mechanism; Fig. 2 is a sectional view taken along line II-II in Fig. 1;

Fig. 3 is a partial sectional view taken along line III-III in Fig. 1 on an enlarged scale Scale.

At its lower part is the mechanism according to the invention two parallel struts or supports 1, which carry the corresponding seat S. For this purpose are the front ones Ends of the two supports are hinged at the point indicated by the reference number 2 on two arms 3 which are fastened below the seat.

At their rear ends, the two supports are around a horizontal one Axis pivotable, which runs in the transverse direction. More precisely, the rear ends are attached to a rotatable shaft 4, which in common rotation with the inner sleeve of an elastic and damping Rückhol el ementes 5 connected within the mechanism is. The form of the arrangement of this element is detailed below.

At its upper part, the mechanism is provided with a sliding plate 6 which can be attached to the back of the back of the seat S is, for example with the help of a bracket or flange 7. The two edges of the sliding plate can be moved in two sliding guides 8 held, which are provided inside the frame or box 9 of the mechanism according to the invention.

According to an essential feature of the invention, the two run Slideways essentially along an inclined plane X-Y

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parallel to the chord of a bow C, which is formed by the front end 2 of the two carriers 1.

The two sliding guides are made of plastic on the inside existing lining 10 provided, which can for example consist of polyamide resin and a constant friction at the edges the sliding plate 6 exerts. This friction takes part in the damping of the vibrations of the seat.

A stop 11 is provided at the upper end of the two sliding guides 8, which limits the movement of the sliding plate 6 upwards. The stop is held by a pivotable lever 12, which is subject to the action of a return spring 13.

Another stop 14 is at the lower end of the sliding guides 8 arranged to limit the downward movement of the flange 7 and the slide plate 6.

In the same way it can be seen that a damping element 15 is fixed between the sliding plate 6 and the flange 7 on the back of the seat. The damping element surrounds the bolt 16, which for The purpose of fastening the sliding plate to the flange is to enable the seat to be easily shifted relative to the sliding and guide plate

The elastic and cushioning return element 5 is known in Way formed from elastic material, preferably from rubber and is on the one hand on an inner socket 1 7 and on the other hand an outer ring 18 is glued or tied off. The horizontally extending and de two carrier 1 supporting shaft 4 is with the inner Bush 17 of the return element connected in this way.

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The elastic and damping return element is mounted in the lower part of the frame or housing 9, while the outer ring 18 is stationary in the direction of rotation at least in the direction in which it has the tendency to move under the effect of the driver's weight on the seat turn.

As a result, the ring is connected to the frame by means of a rod 19 or housing 9 connected. The rod 19 is articulated at 20 on a plate 21 which is carried by said ring. The opposite End of the rod passes through the upper end of the housing 9 and carries a button 22. By pressing the button, the Effective length of the rod 19 and, as a result, the angular position of the Outer ring 18 of the return and damping element 5 changed will.

There is a fixed stop 23 is provided which is suitable for a to hold the plate 24 connected to the inner ring 1 7 of the element 5. The arrangement is such that the stop 23 prevents the rotation of the Plate limited in the direction of rotation which corresponds to the lifting of the two carriers 1. So you can adjust the output voltage in a suitable way of the elastic element 15 by actuating the grip button 22.

It is enough to make an initial adjustment of the elastic and cushioning Element according to the way of sitting of the position on the seat S to be carried out.

The frame or the housing 9 of the mechanism according to the invention is movable in terms of its height with respect to a fixed frame arranged. This frame can tzw with the frame. chassis

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of the corresponding vehicle. It is as a result Blocking or stop means are provided to fix the housing of the mechanism according to the invention in the respective position to be able to. In this way, the desired starting height of the seat S is determined.

In the present embodiment, the fixed frame is essentially formed by two curved tubes 25, at the vertical of which Legs the housing 9 can slide.

The fixation of the housing in terms of its desired height is achieved by a stop or blocking system which has a rack 26 connected and fixed to a plate 26a. The plate 26a in turn is connected to the vertical legs of the two tubes 25. The blocking and stop system is the same provided with a blocking plate 27 which engages in the teeth of the rack 26 and has complementary teeth. The blocking plate is carried by a pin 29 which in turn passes through the housing 9 of the mechanism according to the invention is held. The pin can slide in a vertical slot provided in plate 26a. The plate 27 can through Screwing a gripping knob 28 relative to the rack 26 can be tightened. The gripping button is attached to said pin 29. With this bracing, the sides of the plate 27 are strongly against the sides of the tubes 25, whereby one complete Blocking of the housing 9 reached. It is effectively possible to adjust the desired position of the seat S in terms of its height reach.

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The position of the seat in the longitudinal direction can be achieved in the same way by offsetting the frame formed by the two tubes 25. For this purpose, the horizontal legs of the two tubes are held in two guide bushings 30 which are connected to a plate 31. This plate can be attached to the chassis of the vehicle. Tensioning means 32 are provided which make it possible to clamp or block the tubes 25 in the respectively desired longitudinal position.

During the corresponding movements of the vehicle, the seat S is held in such a way that it can lower itself under the effect of the weight of the driver and under the effect of the impact of knocks. The front end 2 of the carrier 1 of the form described describes a circle C around the center of an elastic and damping return element 5. At the same time, the slide or guide plate 6 can be moved in the slide guides 8, the axis of which is parallel to the outer circle with respect to a chord Ends of the carrier 1 runs. Under these conditions, the adjusted position of the seat remains essentially constant.

It should be noted that the bushing-shaped damping element 15 slight relative movements of the seat with respect to the sliding and guide plate 6 allows.

Another advantage of the mechanism according to the invention is shown in FIG the fact that it allows vertical displacements or movements without going from front to back or opposite for this purpose, reaction movements running in the longitudinal direction take place. This gives you excellent seating comfort already known hanging and holding systems.

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The friction of the guide and slide plate 6 within the liner the sliding guides 8 makes it possible to dispense with a hydraulic shock absorber or the like. The friction contributes to one Braking of the plate and in this way participates in the damping of the seat's vibrations, together with the Effect of the elastic element 5.

The mechanism according to the invention ensures excellent results Damping the vibrations of the seat and an elastic return to the starting position.

The mechanism according to the invention is particularly determined for seats of agricultural tractors or vehicles of other types or for automobiles. It can, however, become elastic in the same way Suspension of seats of any type can be used, especially for those vehicles which are on an irregular surface travel.

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Claims (4)

PATENT CLAIMS: 1 . Elastic suspension system for vehicle seats, in particular of motor vehicles, so of agricultural tractors, with an elastic element in the form of a ring, which vibrations attenuates, in which an inner sleeve of the element is connected to a movable member associated with the seat, while an outer ring of the damping element is connected to the fixed frame of the vehicle or vice versa, characterized in that the Suspension system has at its lower part a seat-bearing and pivotable support (1), whose with respect to the seat suspension the opposite end is connected to the elastic return and damping ring (5), and that on the upper part of the suspension system a slide and guide plate (6) attached to the back of the seat back and slidable along a slide guide (8) is, which runs essentially parallel to the chord of a circle (C) passing through the hinge point (2) of the seat (S) at his Carrier (1) is described. 2. Suspension system according to claim 1, characterized in that the sliding guide (8) for the sliding plate (6) of the seat back with a material made of plastic or another suitable material Lining (10) is equipped, which due to its coefficient of friction to a vibration damping braking effect the sliding plate contributes. 309840/0356 3. Suspension system according to claim 1, characterized in that the elastic ring, which contributes to recovery and cushioning, and the sliding guide of the seat back on a frame or a carrier (9) are attached, which can be moved in a vertical direction on a fixed frame and has blocking means (26, 27, 28), to fix the frame or carrier in the desired position. 4. Suspension system according to claim 2, characterized in that the fixed frame has two struts (25) which extend substantially vertically, and that the blocking means consist of one with the two struts connected to the rack (26) and a blocking rod having complementary teeth (25), the Blocking rod is held by the carrier to be fixed. 309840/0356