DE2851129A1 - Sprung seat for utility vehicle - includes lateral curved guides and is spring loaded towards centre setting - Google Patents

Abstract

An adapting seat mounting for a utility vehicle in which the seat tilts to compensate for vehicle tilting by being supported on curved, lateral rails and spring mounted towards the middle of the vehicle. The support rail (3a) has two separate arcs whose centres of curvature at the head height of the seat occupant. The seat tilts about the head pivot so that a comfortable support is obtained, with the occupant having undisturbed visibility. The mounting allows good driving control for a rough terrain vehicle.

Description

description

The invention relates to a horizontal oscillating device for vehicle seats, which can be installed under the seat shell and the side lifts of the seat shell via sliding elements or roles that are guided in appropriately designed tracks, compensates.

6 are vehicle seat inclination adjustment devices for compensation known from vehicle bank slopes through the terrain, which, however, can only be and locking can be adjusted by hand or external energy (DT OS 908830 and DT OS 27 09 123). They have the disadvantage that an automatic incline change of the vehicle seat is not possible if the slope of the terrain changes.

In other known systems with freely movable inclination compensation feedback is only possible through spring force. The tipping point (DT OS 26 00 273j or the ideal guide point reached by support struts (DT OS 23 17 824) of the The seat shell is below the center of gravity of the seated person, so these systems are inherently unstable and exact depending on the body weight of the seated person need to be adjusted.

Another system is known, in addition to the supporting spring elements is still equipped with a counter-rotating weight (DT OS 24 r 766, DT OS 2o 02 133). Here, too, the tipping point of the seat shell is below the center of gravity of the seated person, so that this system is also unstable and an accurate one for Each person's weight requires a corresponding adjustment.

The system closest to the invention (DT OS 25 37 174) has the disadvantage that with a downstream vertical vibrating device of a known type, which are not installed behind, but under the seat shell, through the behind Iiorizontalschwingeinrichtung articulated hanging from the backrest of the seat, built-in Difficulties arise. It would have to be a rigid support bracket from the underseat vertical oscillating device be installed up to the upper articulation points of the horizontal oscillating device. Often, oscillating devices behind the backrest are completely undesirable.

The invention is based on the object of a horizontal vibration device so to make it in a block construction under the seat shell of a vertical oscillating device known type to be able to install either upstream or downstream.

In principle, the same vibration characteristics should be achieved, as with the oscillating strut system (DT OS 25 37 174). But it should also be used for vehicles with low and slow cross slopes a technically simple and therefore inexpensive one System allow the seated person without readjustment and primarily without External energy automatically sits vertically inside by adjusting the adjustment in each Vehicle position is mainly due to the weight of the seated person and uncontrolled tipping of the seat into the end position is largely excluded is.

This object is achieved according to the invention in that the seat shell is movable via itollenmitel or sliding elements on a guide element that either arched, with a center of curvature or a separate center of curvature for each half of the guiding element, at least above the center of gravity and preferably near the head of the seated person lies, or is flat and either horizontal between the roller means or sliding elements or rising to the guide element and outside either horizontally or to the guide element is designed to rise.

Further features and expediencies of the invention emerge from the description of exemplary embodiments using the figures.

Of the figures, Fi6. 1 the vehicle seat with the swinging device in the parallel stroke in the side view from the rear, FIG. 2 the oscillating device in the top view, lig. 3 the front view of the vibrating device box, FIG. 4 the Vehicle seat with oscillating device in the negative stroke in the side view from the rear, 5 shows the vehicle seat with the oscillating device in the positive stroke in a side view from behind, Fig. Ga, b; 7a, b; Sa, b; ba, b; tOa and tOb Execution examples of the vehicle seat lit oscillating device shown schematically in various broader possibilities in the side view from behind, where the rollers or sliding elements are attached to the seat in group a and to the base frame in group b.

Under the seat shell 1, for example, four rollers 7a, b, c, d attached, each in a circular arc-shaped path 3a, b, c, d with the same radii of curvature Kr and Kl, which preferably have their center near the head or shoulders, are led. These four roller conveyors can be tilted in the middle and are mounted on consoles 5a, b, 5c, d connected to a frame box 2, the bottom underside of which as a receiving plate for a downstream underseat vertical oscillating device of known type - not shown- is provided.

In order to achieve different vibration characteristics, the Curved tracks are made adjustable by for each roller track 7a, b and 7c, d associated arc tracks 3a, b and 3c, d at the inner ends, for example with a joint strut 6a or 6b are connected and via an adjustment axis 4 with a Pair of arched tracks 3b, d, which belong to a roller axis, is connected in a rotationally fixed manner, while the other pair of arched tracks 3a, c are freely rotatably mounted in their consoles 5a, c is. It is thus achieved that the four curved tracks for each roller axis are running in the same direction and can be adjusted synchronously in opposite directions for each roller track. This is necessary in order to achieve symmetrical movements for lifting the seat to the right and left.

An adjustment of the arc tracks 3a, b, c, d can be done with the Adjustment axis 4 non-rotatably connected adjusting lever 17, either by pushbutton or a set screw mechanism of known type can be established. Below the three main setting options are described: Case 1) The arched tracks 3a, b, c, d are horizontal, or their centers of curvature Kr and K1 are vertical to frame box 2, the parallel lift is created - fig. 1.

The parallel lift should be selected when the terrain is very different Has bumps and driven at constantly changing driving speeds will. The seat shell can evade the transverse joints and the seat surface remains level parallel to the chassis and the vibration geometry is therefore neutral.

Case 2) The sheet webs 3a, b, c, d are tilted so that their inner The ends are higher than the outer ones, resulting in the negative stroke - Fig. 4.

This setting should be selected when high lateral accelerations occur the center of gravity S act. The momentary pole Mn of the oscillation system, which for the Transfer of the transverse acceleration to the center of gravity S is decisive, is below closer to the seat level and thus to the vehicle's line of contact with the ground. As already in DT OS 25 37 174 was explained, is the one acting on the center of gravity S. Theoretically, lateral acceleration is zero if the instantaneous pole M is exactly on n of the contact line the vehicle wheels of an axis lie with the terrain. Some effective lateral acceleration However, on the center of gravity S is necessary in order to achieve an upgraded sitting position to compensate for the additional tilting movement of the vehicle. The one now occurring Inertial force of the center of gravity S causes the Seat shell evades against the tilting movement of the vehicle. At the same time will achieves that the seat level adapts to the originally horizontal position, by leaning outwards against the vehicle inclination. A major advantage The invention is as described in the DT OS 25 37 174 system that also during the negative lift, regardless of the body weight of the seated person, depending on the side lift the seat shell build up correspondingly large, natural restoring moments and the The seat swivels back into its starting position again without the influence of external energy, there the pivotal point that is decisive for the restoring torque, which is here the tiomentanpol M, moves faster outward n during the side stroke than the line of action of the center of gravity S.

Case 3) The sheet tracks 3a, b, c, d are tilted so that their inner Ends are lower than the outer ones, creating the positive stroke - Fig. 5.

For slow swaying movements of the vehicle without significant! Ruerbeschl This setting is suitable for inconsistencies. Since the honentanpol M is now above the seat level, the p oscillating movements of the seat pan act like a hanging basket.

When the vehicle slopes slowly, the seat pan moves inwards until the center of gravity line of the center of gravity S is the instantaneous pole Mp cuts. Here, too, the seating level is the same as the originally horizontal one Position again. In the position shown in FIG. 5, the seat clip 1 roll back a little, with the instantaneous Mp of the center of gravity line at the same time comes towards you. The seating level is then no longer completely horizontal. Should be a absolutely horizontal sitting position can be achieved, the arched tracks would have to be designed in this way be that their centers of curvature Kr and K1 above the center of gravity S and preferably lie close to the head and the arches are turned inwards until they are the centers of curvature Kr and Kl in the axis of symmetry of the oscillating device meet, The natural restoring moments through the center of gravity S are, however much smaller so that frictional forces already set the center of gravity restoring forces can noticeably influence.

A damping cylinder 8, which on the one hand with the frame box 2 and On the other hand, it is articulated to the seat shell 1 and in both lifting directions dampens with the same effect, prevents unwanted resonance vibrations from occurring can.

The compression springs loa and lob work with a vertical slot trained stop 13 on the seat shell 1 to the natural restoring forces to support. The size of the desired spring return forces can be infinitely variable and acting symmetrically for both stroke directions via nuts lla and lib and via one equipped with a right and left thread Yerstellwelle 9, which in len Side walls of the frame box 2 is rotatably mounted, can be set. A Guide stop 15a and 15b prevents the ijuts 11a and 11b from moving So that the compression springs 10a and au do not overlap during the oscillation process can, they are axially immovable by one in the rivet on the adjusting shaft 9 Stop 14 separated Are the seat shell 1 not required or vibrations undesirably, the oscillating device can lock the by a Long hole 21 is provided in the frame box 2 and one acted upon by a spring 20 Locking linkage 18, which is connected to the seat shell 1 via a sheet metal 19, can intervene. The seat shell is now locked in the middle position.

If the vehicle is constantly tilting to the side, like this is the case when driving across the slope or when plowing, the seat shell l can be determined with the same locking device 19, 18 and 20, however here in one of the elongated holes 22a or 22b provided in the frame box 2, which simultaneously mark the end stop of the seat shell. With one of the selected end stop locks corresponding adjustment of the arched tracks 3a, b, c, d, the seat shell can l in be inclined to the desired position. Will be a constant, lateral displacement of the Seat shell 1 either to the left or to the right is required or desired, this can be can also be done by placing the seat shell in the corresponding end stop is locked and on level ground the curved tracks 3a, b, 3c, d in parallel lift position and in sloping terrain, the curved tracks with the adjustment mechanism 17 in the appropriate Position to be determined. When driving back the same sloping terrain will be the arched tracks 3a, b, c, d adjusted in the opposite tilting direction.

The example of the oscillating device described can be analogously as shown schematically in Fig. 6b, 7b, 8b and 10b, also install the other way round, by -not shown- the box frame 2 including all components with the Floor up under the seat shell 1 and the ollen 7a, b, c, d, the stop 13 and the end of the damping cylinder 8 mounted on the seat shell 1 on a plate the vertical oscillating device or substructure. The oscillating geometry is the same as in the design in the positive and negative strokes Adjustment of the arched tracks opposite in their mode of action. The reverse Installation of the oscillating device has the advantage that the adjusting mechanism of the arched tracks resonates and the seated person better adjust the setting while driving can.

A change in the natural restoring forces due to the center of gravity 5 with the same or similar oscillation geometry can be achieved if the curved paths can be changed in their rise after the seat shell has passed zero.

In Fig. 6a, b; 7a, b; 8a, b and 9a, b is in its specific setting options an embodiment is shown schematically, wherein in the a-group of Fig. 6, 7, 8 and 9 the castors under the seat shell and alternatively in the b group the rollers are attached to the substructure.

The tracks of each roll are in the middle to partial tracks 23a, b, c, d - shown only for one roller track - divided, either flat or curved can be formed. Each pair of partial paths is on a common axis, the serves as an adjustment axis for one partial web side, rotatably mounted.

The partial tracks 23a, b, c, d are to be adjusted in the same way as the curved tracks, but in a separate, double adjustment version.

For example, the inner partial webs 23b and 23c via a Adjustment axis with adjustment lock and among each other on the facing Ends coupled with a hinged strut and the outer partial webs 3a and 2-3d over a second adjustment axis with adjustment lock and among each other via a connecting rod adjustable with opposite adjustment effect.

The hecilanism of the return springs as well as the damping cylinder is For the sake of clarity, not shown in the exemplary embodiments, since this is analogous as can be installed in the curved track example.

In Fig. 6a and 6b, the inner partial webs 23b, c are to the rollers inclined, while the outer ones are horizontal, with each other in Fig. 6a facing partial webs 23b, c show upwards and in Fig. 6b downwards. In Fig. A negative stroke is achieved in 6a and a positive stroke in FIG. 6b.

The reverse setting is shown in FIGS. 7a and 7b. the outer partial webs 23a, d are inclined to the rollers and the inner partial webs '3b, c horizontal. This results in FIG. 7a a positive stroke and in Fig. 7b a negative stroke. The main advantage of this separately adjustable Partial tracks can be seen in the example in FIG. 7b, since the seat shell has almost no natural restoring torque through the center of gravity S and thereby in the end position threatens to tip off. This danger can be countered without the oscillation geometry to change by moving the inner partial webs 23b, c from the horizontal to the rollers turned down a bit and hated the outer partial webs 23a, d for the same thing be made steeper.

In Fig. Da and 8b, the parallel stroke is due to the symmetrical adjustment the cable cars 23a, b, c, d to reach.

In rig. 9a and 9b the cable cars 23a, b, c, d are placed horizontally, so that a plane arises. There is no natural restoring force here and can only be neutralized via the spring forces. This setting is then special Recommended if only a lockable side adjustment of the seat shell is required and this is necessary several times during the journey. It's the opposite for parallel stroke adjustment (Fig. 8a, b and Fig. 1) no lifting during adjustment the seat shell required by physical strength.

For vehicles that only sway slowly towards the largest arrow exercise, or predominantly only have to compensate for an inclined position, is an adjustment device not required for the roller conveyors, so a simple and therefore cheaper one Execution is sufficient.

In Fig. 10a and 10b, the roller tracks 25 and 26a are with their Krü ; radius of curvature, or a separate radius of curvature for each roll, above the center of gravity S and preferably near the head either on a substructure -Fig. lOa- or under the Seat shell -Fig. lOb- firmly attached.

Claims (8)

Claims for for for a vehicle seat that has roller means or sliding elements can be moved on a guide element, characterized in that that the guide element (3a, b, c, d; 23a, b, c, d; 24a, b, c, d; 25a; 26a) of the roller means (7a, b, c, d) or sliding elements either curved, with one, or for each half of the track own center of curvature, which is at least above and preferably near the head seated person lies, or is flat and between the roller means or sliding elements either horizontally or ascending and outside either horizontally or ascending is trained. 2) Horizontal vibrating device according to claim 1, characterized in that that the guide elements (3a, b, c, d; 23a, b, c, d; 24a, b, c, d) each roller means (7a, b c, d) or sliding element is executed divided. 3) llorizontalschwingvorrichtung according to claim 1 and 2, characterized in that that the guide elements (3a, b, c, d; 23a, b, c, d; Z4a, b, c, d) are rotatably mounted and with an adjusting mechanism (4, 6a, b; 17) are coupled. 4) llorizontalschwingvorrichtung according to claim 1, 2 and 3, characterized characterized in that a damping cylinder (8) between the seat shell (1) and a Frame box (2) is articulated and dampens the side strokes in both directions. 5) Iiorizontalschwingvorrichtung according to claim 1, 2 and 3, characterized characterized in that between the seat shell (1) and the frame box (2) spring elements (10a, b) are provided that support the restoring forces. 6) horizontal oscillating device according to claim 5, characterized in that that the teder elements (10a, b) via a common adjusting shaft (9) or equivalent Device are adjustable in order to be able to change the restoring forces symmetrically. 7) llorizontalschwingvorrichtung according to claim 5 and 6, characterized in that that the spring elements (10a, b) by a stop (14) for their assigned area of action the seat stroke are separable. 8) Horizontal vibrating device according to claim 1, 2 and 3, characterized characterized in that the side stroke of the seat shell (1) can be locked with the frame box (2) is.