EP0445325A1 - Undermattress - Google Patents

Abstract

The undermattress according to the invention comprises a frame over which are stretched slat-like support members (2), arranged in the manner of a grid, and resiliently supported in the region of their axial ends, at side rails (3, 4) of the frame, on supporting wires or supporting belts (14), via push-rods (5) which are movable substantially perpendicularly to the plane of the frame. The load acting on the individual push-rods is in turn transferred, via rocking levers (13) which are supported on an abutment surface at the side rail of the frame, to the supporting wire or the supporting belt, so that a precisely defined counter-force is produced as a function of the depth of penetration of the push-rods into the frame. In this arrangement, the rocking levers are preferably in the shape of a Cornu spiral. <IMAGE>

Description

The present invention relates to a sub-mattress of the type mentioned in the preamble of claim 1.

Under mattress in the sense of the present invention means in particular a slatted frame-like frame, as is usually used in high quality beds. However, the present invention is by no means limited to beds, but is also used, for example, on single or multi-part couches, deckchairs or, in general, seating and reclining furniture of all kinds.

Such mattresses serve in particular to balance the load and weight depending on the weight of a person lying on the bed or sitting on the chair.

A generic base mattress is known for example from DE 38 27 028 A1. This known base mattress consists of at least one essentially rigid frame with side parts that are spanned by rust-like arranged slat-like support elements. The axially outer ends of the longitudinal beams are movably or pivotably connected with plungers which are resiliently mounted perpendicularly to the plane of the frame on a carrier tape attached to the frame. The carrier tape is guided over two rows of rollers arranged vertically one above the other and stretched over deflecting rollers at both axial ends of the side members. The plungers also have movable rollers at their immersion ends and are arranged with respect to the rollers of the longitudinal beam so that the rollers of the plunger are at a gap to the axially spaced support rollers of the support belt. If the rust-like carrier elements are now loaded, for example, by the weight of a person lying thereon, the plungers dip into the side part of the frame in the direction of the load and reach through with the lower end of the upper row of rollers of the carrier rollers of the carrier belt, the carrier belt being tensioned at the same time. Due to the arrangement of the rollers, they act as deflection rollers for the carrier tape, which results in a force acting on the adjacent plunger when the plunger is immersed. However, this is only possible if the carrier tape either slides smoothly over the guide rollers or rolls on them. In other words, in the case of the load described so far, the deflection simultaneously results in a load distribution and a force counteracting the load on the adjacent plungers, which overall results in a medically and orthopedically desired stretching effect, in particular on the spine of the person resting on the lower mattress.

As the load increases, the plungers are immersed even further in the side part of the frame at the location of the greatest load to be absorbed, for example in the area of the body's center of gravity, as a result of which the upper run of the strap is frictionally and frictionally engaged by the roller on the plunger against the lower run of the strap is pressed. This frictional engagement hinders the run of the support belt both in the upper and in the lower run and ultimately even prevents it completely. In other words, the weight compensation by applying a counterforce to the adjacent plunger no longer takes place or only to an extremely limited extent. As a result, this known system fails, particularly in the area of the greatest load, where load balancing and the associated stretching action of the spine are of particular importance.

Based on this known prior art, it is the object of the present invention to provide a sub-mattress that enables the sub-mattress to be adapted to the body and its support under all operating conditions, a targeted body stretching or extension being made possible by load balancing and counterforce should.

This object is achieved by a base mattress according to the teaching of claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

The invention is therefore based on the knowledge that a shaping and stretching effect of a generic base mattress is only possible under all operating conditions if both load balancing and counter-load balancing occur. In other words, the load applied by a person to be picked up must not only be distributed more or less indefinitely over the entire support area, but each individually acting load on each individual plunger must result in a precisely defined and definable counterforce.

The sub-mattress of the present invention consists of at least one frame, which usually consists of two side members and two cross members. The frame is spanned by rust-like arranged slat-like support elements which are aligned transversely to the longitudinal direction of the frame. Each of these slat-like support elements is connected at each of its two axial ends to a plunger which is mounted so as to be displaceable substantially perpendicular to the plane of the frame. In the longitudinal beams, which are preferably designed in the manner of a box-shaped hollow profile, at least one suspension cable or strap is freely tensioned in each case. Free here means that the support rope or support tape does not have any guide rollers on the Side members is guided. At their end pointing away from the slat-like support elements, the plungers are each connected in an articulated manner to a rocker arm, an opening being provided between the rocker arm and the plunger, through which the carrier cable or carrier tape extending in the longitudinal direction of the carrier extends. In other words, when the tappet is loaded, it is displaced in the load direction relative to the longitudinal beam and comes into contact with the rocker arm with its immersion-side end on the support band or support cable in the area of the articulated connection, the load being primarily taken up by the support cable. The rocker arm articulated with the plunger about an axis that runs both perpendicular to the movement axis of the plunger and to the longitudinal axis of the frame is arranged so that both the end connected to the plunger and the second end of the plunger not connected to the plunger The rocker arm can be brought into contact with the suspension cable or strap from below.

The rocker arm rests on the bottom of the side member, preferably even when the bottom mattress is not under load. The support area serving as a toggle bearing, viewed in the longitudinal direction of the frame, is at a distance from the longitudinal axis of the plunger, so that when the plunger penetrates into the longitudinal member, a torque is applied to the toggle lever via this distance acting as a lever arm. In other words, when the rocker arm is tilted, the end of the rocker arm connected to the tappet is moved in the direction of the frame floor, while at the same time the opposite end of the rocker arm is brought into contact with the support band or cable from below. When the plunger penetrates further into the longitudinal beam, the carrying band or the carrying rope is simultaneously acted upon by the load transmitted by the plunger and a counterforce or counterload applied via the deflection of the rocker arm. In the course of the penetration path of the plunger, the length of the effectively effective lever arm changes between the contact area of the Rocker arm and the longitudinal axis of the tappet or the swivel joint of the rocker arm-tappet connection, but the position of the tappet or swivel joint remains essentially constant with respect to the longitudinal axis of the carrier or the frame. In addition to the torque, the rocker arm is thus subjected to an axial force which acts in the longitudinal direction of the carrier and which results in a relative movement between the rocker arm and the contact area of the longitudinal member base.

In other words, the rocker arm does not always rest on the bottom of the side member with the same convex surface area; rather, this investment area changes depending on the tilt position.

The cross-section of the rocker arm preferably has the shape of a curve with a variable radius of curvature, this radius of curvature being selected as a function of the expected load or the intended counterforce. In particular, it is advantageous if the rocker arm has the shape of a clotoid, since the radii of curvature that change proportionally to the arc length simultaneously achieve defined contact areas in each rocker arm position and a changed lever effect that is dependent on the depth of penetration of the plunger and the resulting change in the contact areas. It is particularly advantageous in this exemplary embodiment if the rocker arm is connected to the plunger in the region of its greatest radius of curvature, since this achieves dynamic counter-load behavior, namely a relatively low counterforce effect with a low penetration depth of the plunger and a high counterforce effect with a high penetration depth. This is particularly important when the sub-mattress according to the invention has to be designed for an occasional extreme load.

Not only the size of the counterforce, but also its direction depends on the depth of penetration of the plunger and thus the Position of the rocker arm. For example, with a small penetration depth, corresponding to a low load to be absorbed, the rocker arm essentially acts both on the loaded plunger and on the adjacent plunger, while at a large depth of penetration, corresponding to a large load to be absorbed, the counterforce acts primarily on the load introducing tappet.

Both the convex contact surface of the rocker arm and the bottom of the side member are preferably designed as sliding surfaces. This means, in particular, that a material pairing of rocker arm and side member base is chosen which has the lowest possible coefficient of friction. The sliding surface of the side member preferably consists of an inserted, glued or otherwise fixed sliding plate made of a low-friction material, for example of PTFE. As an alternative to this, however, the bottom of the side member can consist of a series of roller bearing elements, for example in the form of support rollers, on which the rocker arm is mounted in a rolling manner.

In the simplest case, the mutually assigned sliding surfaces on the bottom of the side member and on the rocker arm are flat in cross section. This results in a linear contact. Preferably, however, the sliding surface of the rocker arm and / or the sliding surface of the side member is convex, so that the line contact is replaced by a point contact with reduced friction.

At least in the loaded state, the rocker arm and / or tappet are under load on the support belt or support cable, a relative movement generally taking place between the contact areas and the support belt. These contact areas are therefore preferably designed at the same time as sliding areas and guide areas. For this purpose, the rocker arm and / or the tappet has at its end connected to the rocker arm a groove-like recess for receiving the carrier tape, the shape of the groove depends essentially on the shape and cross-section of the support band or cable. Depending on the desired coefficient of friction to be achieved between the support band and the rocker arm / tappet, the sliding surfaces in the groove base can be smooth, for example polished, or ribbed.

In a particularly preferred exemplary embodiment of the invention, the support areas are not designed as sliding areas, but instead have roller bearing elements, in particular in the form of guide rollers for the support rope or support band. The shape of these guide rollers is selected as a function of the cross section of the support band or support cable.

The plunger and the rocker arm can in principle consist of any material. In a particularly preferred embodiment of the invention, however, both the tappet and the rocker arm are made of plastic and are produced in particular by an injection molding process. In addition to the advantages in terms of production technology, the friction properties of such plastic components are significantly improved, for example in comparison with wooden components, and the design of the connection between rocker arm and tappet is simplified. For example, the rocker arm and the plunger preferably have connecting elements at their mutually facing ends, in particular in the form of elastic latching tongues, which enables an easy-to-produce clip-latching connection. The plug-in axles for a clip-lock connection can either be integrally formed on the tappet or on the rocker arm or, if both the plunger and the rocker arm have elastic locking zones, it can be a push-through axis which extends through all the locking zones and which can also have a guide element for the suspension cable or strap , be used.

To fasten the slat-like support elements to the upper axial end of the plungers, fastening elements can be formed integrally on the support elements and / or plungers or separate fastening elements, for example in the form of known wooden dowels, can be used. However, this attachment is preferably not rigid, but rather flexible in a manner known per se, for example in the manner of an articulated or ball head, since this prevents the rams from tilting under load.

In the simplest case, the side member consists of a side part which essentially serves for stability and a base which serves as an abutment surface for the rocker arms. However, the longitudinal member preferably has a box-shaped profile which is essentially rectangular in cross section, consisting of two side walls, a base and a cover, the cover having recesses for the passage of the plungers. In order to ensure safe guidance of the plungers that is movable perpendicular to the plane of the frame, the plungers preferably have, on their walls running in the longitudinal direction of the frame, rail-like guide members which engage in correspondingly shaped grooves in the side walls of the side member. The recesses in the cover of the side member can also provide additional support as additional guide elements.

As an alternative to the guide described above, guiding the tappet by two axially spaced guide pairs is also conceivable, the first guide pair consisting of the profile of the tappet in cooperation with the complementarily shaped recess of the cover and the second guide pairing by axially extending the connecting plug axes between the tappet and Rocker arm in cooperation with corresponding grooves in the side walls of the side member is shown.

The actual bearing for the load to be taken up is formed by the supporting rope or supporting tape in the sub-mattress of the present invention. In principle, this can have any cross-section, but preferably carrying cables with a round cross-section and tapes with a flat-rectangular cross-section. The support rope or strap is stretched between the front ends of the side member, which can be closed, for example, by closure caps, wherein a tensioning device known per se for the support rope or strap can preferably be provided on at least one of the ends. On the one hand, this compensates for a wear-like decrease in the belt tension and, on the other hand, the carrying properties of the entire bottom mattress can be preset depending on the loads to be expected.

The carrier tape can also consist of any material in principle. However, a plastic rope or plastic tape is preferably used which has an inherent elasticity in the range between 10 and 30%, preferably in the range of 15%. This inherent elasticity improves in particular the comfort of the base mattress, but is not necessary for the actual function, namely the application of a stretching effect by generating defined counterforces.

Fig. 1

in teilsweise aufgeschnittener perspektivischer Ansicht ein erstes Ausführungsbeispiel einer Untermatratze gemäß der vorliegenden Erfindung;

Fig. 2

im Längsschnitt in schematischer Darstellung einen Längsträger einer Untermatratze der vorliegenden Erfindung;

Fig. 3

in schematischer Darstellung ein benachbartes Stößel/Kipphebelpaar mit Gleitlagerung des Kipphebels gemäß der vorliegenden Erfindung;

Fig. 4

ein benachbartes Stößel/Kipphebelpaar mit Rollenlagerung des Kipphebels;

Fig. 5

ein benachbartes Stößel/Kipphebelpaar gemäß der vorliegenden Erfindung, wobei das Tragseil über Gleitflächen am Kipphebel bzw. Stößel geführt ist;

Fig. 6

das Kipphebel/Stößel-Element nach Fig. 5 in perspektivischer Darstellung;

Fig. 7

ein weiteres Ausführungsbeispiel einer Untermatratze der vorliegenden Erfindung in Explosionsdarstellung;

Fig. 8

in schematischer Ansicht ein Stößel/Kipphebel-Element mit schrägliegender Stößelmechanik durch eine schräg angeordnete Führungsnut;

Fig. 9

in perspektivischer Ansicht ein weiteres Ausführungsbeispiel einer schrägstehenden Stößelmechanik durch eine schrägstehende Führungsleiste;

Fig. 10

in perspektivischer Ansicht eine kassettenartige einbaufertig vormontierte Stößelmechanik gemäß der vorliegenden Erfindung;

Fig. 11

in schematischer Darstellung einen kastenförmigen Längsträger in Elementebauweise mit Einschubprofilen;

Fig. 12

in schematischer perspektivischer Ansicht ein zweites Ausführungsbeispiel eines kastenförmigen Längsträgers in Elementebauweise;

Fig. 13

in schematischer perspektivischer Ansicht eine Untermatratze gemäß der vorliegenden Erfindung mit hochklappbarem Kopfteil; und

Fig. 14

in seitlicher Ansicht in schematischer Darstellung einen Liegestuhl bestehend aus drei Untermatratzen gemäß der vorliegenden Erfindung.

In the following, the invention is explained in more detail by way of example only with reference to the following drawings. It shows:

Fig. 1

a partially cut-away perspective view of a first embodiment of a mattress under the present invention;

Fig. 2

a longitudinal section in a schematic representation of a side member of a sub-mattress of the present invention;

Fig. 3

a schematic representation of an adjacent plunger / rocker arm pair with slide bearing of the rocker arm according to the present invention;

Fig. 4

an adjacent plunger / rocker arm pair with roller bearing of the rocker arm;

Fig. 5

an adjacent tappet / rocker arm pair according to the present invention, wherein the support cable is guided over sliding surfaces on the rocker arm or tappet;

Fig. 6

the rocker arm / tappet element of Figure 5 in a perspective view.

Fig. 7

another embodiment of a sub mattress of the present invention in an exploded view;

Fig. 8

a schematic view of a tappet / rocker arm element with an inclined plunger mechanism through an obliquely arranged guide groove;

Fig. 9

a perspective view of another embodiment of an inclined plunger mechanism by an inclined guide bar;

Fig. 10

a perspective view of a cartridge-like preassembled ram mechanism according to the present invention;

Fig. 11

a schematic representation of a box-shaped longitudinal member in element design with insertion profiles;

Fig. 12

a schematic perspective view of a second embodiment of a box-shaped longitudinal member in element construction;

Fig. 13

a schematic perspective view of a mattress under the present invention with a foldable headboard; and

Fig. 14

a side view in a schematic representation of a deck chair consisting of three mattresses according to the present invention.

In Fig. 1, a first embodiment of a sub-mattress of the present invention is shown partially cut away in perspective. The sub-mattress 1 according to the invention has two longitudinal beams 3, 4 which are spanned in a bridge-like manner by lattice-like support elements 2 arranged in a rust-like manner. With their respective axially outer ends, the carrier elements 2 are fastened on plungers 5 which are movable perpendicularly to the plane of the frame.

The longitudinal beam 3 consists essentially of two side walls 6 and 7, a bottom 8 and cover elements 9, which are each assembled in a conventional tongue and groove construction. The cover elements are arranged so that a passage opening 10 remains for the plunger, the cross section of which corresponds approximately to the cross section of the plunger 5, so that the passage openings serve as the first guide element for the vertical movement of the plunger 5. At the end 11 of the plunger 5 pointing away from the slat-like support elements 2, rocker arms 13 are articulated via pivot axes 12.

In the interior of the longitudinal beams 3, 4, a supporting cable 14 runs in the longitudinal direction, which is fastened in the manner not shown in FIG. 1 in front end caps of the longitudinal beams 3, 4 and braced against them. Portal-like openings 15 are formed between the plungers 5 and the rocker arms 13, through which the support cable 14 extends.

FIG. 2 shows a longitudinal section through the longitudinal beam 3 of the lower mattress 1 according to FIG. 1. While in FIG. 1 the lower mattress 2 shows the sub-mattress in the loaded state, more precisely different loads on the different carrier elements 2, depending on the loads to be absorbed in each case Plunger 5 inserted into the longitudinal beam 3. The rocking levers 13 rest with their convex outer surfaces on the bottom 8 of the longitudinal beam 3, the point of contact or the line of contact serving as an abutment for the rocking movement of the rocker arms 13 depending on the axial position of the tappets 5.

FIG. 3 shows an adjacent tappet / rocker arm pair according to FIG. 2, the carrier elements 2 and the walls and the cover of the side member not being shown for reasons of clarity. In cross section, the rocker arms 13, 13 'have the shape of a curve with a variable radius of curvature, here in particular the shape of a clotoid.

The plungers 5, 5 'and the rocker arms 13, 13' are connected to one another by a snap-in connection in the manner of a clip connection, a guide roller 15, 15 'for the supporting cable 14 being arranged on the pivot axis 12, 12' at the same time. A corresponding guide roller 16, 16 'is provided on a thru-axle at the other end of the rocker arm 13.

The surface 17 of the bottom 8 of the side member 3 is designed as a sliding surface for the rocker arm.

When, for example, the plunger 5 'is loaded, it moves downwards in the direction of the floor 8 of the side member through a guide, not shown, perpendicular to the frame plane, as a result of which the rocker arm 13' with a torque and a normal force in due to the lever between the support region 18 'and the pivot axis 12' z direction is applied. At the same time, the deflecting effect of the rocker arm 13 'causes the front end of the rocker arm 13 'with the guide roller 16' upwards, more precisely, upwards and at the same time in the direction of the plunger 5 ', as indicated by the arc z in the illustration according to FIG. 3. In other words, a downward force of the tappet 5 'causes a counterforce at the end of the rocker arm 13' which is further away from the tappet 5 '. This counterforce has both a component in the z direction and a component in the x direction, the distribution of these components depending on the geometric shape of the rocker arm 13 '. Thus, in the form of the rocker arm 13 'described here, the lever force generated by force deflection acts almost equally strongly on the two adjacent plungers 5 and 5' with a small penetration depth of the plunger 5 ', while with a large penetration depth of the plunger, the lever load effect has its axial load spacing reduced to the vertical load axis of the plunger 5 '. The forces of the lever now created act to a lesser extent on the following plunger 5 via the deflection roller, but primarily on the driving load axis or the loaded plunger 5 '.

Since, due to the geometric shape of the rocker arm 13 ', the bearing area 18' on the sliding surface 17 of the bottom 8 of the longitudinal beam changes continuously as a function of the depth of penetration of the ram 5 ', there is a relative movement between the sliding surface 17 of the bottom 8 and the Rocker arm 13 'instead. This sliding movement is initiated primarily by the fact that the plunger is fixed relative to the x-axis by its guide movable in the z-direction.

As can easily be seen from the geometric relationships described above, the components of the counterforce acting in the x and z directions or their moments can be determined in a simple manner by the shape of the rocker arm 13. In particular, it is possible through the shape of a clotoid, the radius of curvature reversing the length of the curved curve is proportional, set a dynamic counter-load behavior, for example a high counter-force effect with a high penetration depth, caused by a particularly high punctiform load.

4 shows a further tappet / rocker arm pair according to the present invention, which differs from the one described above essentially in that the sliding surface 17 in the base 8 of the side member 3 is replaced by roller bearing elements in the form of rollers 19, 19 '. On the one hand, this design results in a lower coefficient of friction between the abutment 19, 19 'and rocker arm 13, 13', which improves the overall efficiency of the mattress under the invention. However, this advantage is to be regarded as relatively small, since the overall friction conditions can also be regarded as extremely favorable when sliding. The decisive advantage in this embodiment, however, is that either the depth of penetration of the plunger 5, 5 'into the frame can be increased by moving the axes 12, 12' to below the x-axis shown by the broken line, or at same travel of the plunger 5.5 'a significantly reduced height of the longitudinal beam 3 is made possible.

Another advantage of this design is that when the plunger has reached a certain depth of penetration, which corresponds to a high load, the point of contact of the rocker arm is shifted to the side of the roller 19, 19 ', so that a better translation is achieved in the high load range becomes. This has a particularly advantageous effect on the counter pressure that can be achieved with heavy loads.

5 shows a further exemplary embodiment of two adjacent plunger / rocker arm pairs, it being evident from this representation that no guide or deflection rollers are arranged on the rocker arms 13, 13 'or on the plungers 5,5', so that the suspension cable 14 immediately runs smoothly over the rocker arms 13, 13 '. In this exemplary embodiment, the suspension cable 14 is guided in recesses 20, 20 'which can be seen more clearly from FIG. 6 described below. The radial depth of these recesses 20, 20 'is selected depending on the diameter of the support cable 14 so that the support cable 14 always protrudes beyond the foremost limit of the rocker arm 13. This ensures that even if the system is overstretched, ie if the end of the rocker arm 13 not fastened to the tappet strikes the tappet 5, it does not lead to rattling or knocking, since the carrying cable, which is made of a relatively soft material, has a damping effect. The same conditions also exist at the plunger-side end of the plunger 5, so that when the plunger 5 approaches the sliding surface 17 of the base 8 completely, the supporting cable 14 always serves as a stop damper.

6 shows a further tappet / rocker arm element of the present invention in a perspective view, the support cable, not shown here, running over sliding surfaces 22, 23 and 24 on the rocker arm 13 and tappet 5. 6, the articulated connection is designed as a snap-clip connection. For this purpose, two projecting tabs 25 and 26 are arranged at the mutually facing ends of the plunger 5 and the rocker arm 13, which overlap one another in the assembled state. The tabs 26 of the plunger 5 are each designed as elastically expandable locking forks, while the tabs 25 on the rocker arm 13 each integrally formed on their outer sides have a locking axis 27. In this embodiment, the locking forks 26 of the plunger 5 overlap the tabs 25 of the rocker arm 13 from the outside, but the reverse arrangement, i.e. Tabs 25 outside and locking forks 26 inside, is conceivable.

The plunger 5 has a substantially rectangular cross section, with 28 and 29 on its side surfaces, respectively Guide members 30 for engaging in a groove, not shown in FIG. 6, are arranged in the side walls of a side member.

On its upward-facing end face 31, the plunger 5 has a fastening element 32 in the form of a wooden dowel for fastening the lath-shaped carrier elements 2.

7 shows a further exemplary embodiment of an under mattress of the present invention in an exploded view. In this embodiment, the plunger 5 and the rocker arm 13 are connected by means of a snap-clip connection. Both the plunger 5 and the rocker arm 13 each have two projecting mutually overlapping, elastically spreadable locking forks at their ends facing each other. However, the locking axes are not integrally formed on the rocker arm 13 in this embodiment, but are formed by a continuous axis of rotation 34,34 ', which comes into engagement with the locking fork pairs of the plunger and the rocker arm when the two elements 5 and 13 are assembled. In the area between the inner detent forks of the rocker arm 13, this continuous through axle carries a shaped element 37, 37 'in the form of a guide roller. A corresponding shaped element 38, 38 'is arranged in corresponding locking forks 39 at the end of the rocker arm 13 pointing away from the tappet 5. The pairs of guide rollers 37, 38 and 37, 38 'serve as guide elements for the support cable 14 and the support band 14'. In this case, the guide rollers 37 and 38 are preferably of concave-coil-like design in the case of the support cable, while in the case of a support belt 14 'the guide rollers 37' and 38 are preferably of slightly spherical design in order to ensure that the support belt 14 'is in full contact with the guide rollers guarantee.

7 that the bottom 8 of the longitudinal beam 3 is covered with a plate-shaped sliding support 17. This sliding pad 17 can preferably also be applied in the manner of a edge band.

In contrast to the previously described axial guidance of the plunger 5 by tongue and groove elements, the plunger 5 is guided here by an axially spaced two-point guide. The first pair of guides used here are two adjacent cover elements 9, which form a flat contact with the complementary sides of the plunger 5. The elongated axes 34, 34 ′ serve as a second pair of guides, which are in engagement with corresponding grooves 40 in the side walls 6 of the side member 3.

7, the end caps 41 of the side member 3 are also shown schematically, which also serve as a bearing for the support cable 14. A tensioning device 33 for the suspension cable 14 is only schematically indicated, which serves for adjustment when the elasticity of the suspension cable 14 decreases.

The movement of the plunger 5 is essentially perpendicular to the frame plane. However, it can be advantageous to shift the entire plunger mechanism by a few angular degrees from the vertical, so that on the one hand the plunger 5 only grinds into the guide on one side, so that the air gap required in the tongue and groove guide, which is at exactly vertical Guidance cannot reliably prevent the plunger from wobbling and rattling under all conditions, as it were inhibits itself, since a defined contact of the plunger 5 is always guaranteed at at least two points of contact (see in particular FIG. 8b). On the other hand, due to the inclined position of the plunger 5, the load does not act vertically on the rocker arm 13, but rather at a slight angle on the pivot point. This further improves the introduction of the torque and the rotation of the rocker arm 13.

The inclination of the plunger 5 can be achieved in two ways. Either, as shown in Fig. 8, the guide groove 40 is arranged slightly obliquely, while the geometry of the plunger 5, in particular the arrangement of the guide member 30 is carried out axisymmetrically, or, as can be seen in particular from the illustration according to FIG. 9, the guide element 30 is arranged obliquely when the guide groove is arranged vertically in the side wall of the side member.

10 shows a preferred embodiment of the present invention. In this exemplary embodiment, a complete unit of the load suspension device, consisting of tappet 5, rocker arm 13, guide rollers 38 and slide bearing surfaces 17, is arranged in an integrally formed housing box 45. This complete cassette-like unit can be preassembled inexpensively in a simple and rational manner.

On both end faces, the housing box 45 has connecting elements in the form of grooves 46 and springs 47 or latching tongues and latching slots. The respective end faces of two axially adjacent cassette-like units of this type have the connecting elements in offset or complementary form, so that simple coupling of such cassette-like units is possible. As a result, a modular construction of a side member of an under mattress according to the invention is possible, the length being able to be varied in the grid dimension of a structural unit.

The longitudinal beam 3 itself can also be configured in the simplest manner in an element construction according to the modular principle. Thus, in the exemplary embodiment according to FIG. 11, the side walls are formed in a manner known per se from extruded profiles 48.49 made of aluminum or plastic or produced by some other non-cutting shaping, end pieces made of wood, plastic or other materials being inserted or plugged in for veneering can.

12, the longitudinal member 3 consists of a cover profile 53 and a bottom profile 54, which in can be produced in a known manner from plastic or aluminum in an endless process. The two side walls 6 are inserted between these two profiles 53 and 54, the connection to the profiles 53 and 54 being made by expansion dowel-like elements in the manner of a tuck-in piping 55, 56. The side walls can be made of wood or plastic. In order to increase the stability of the entire longitudinal member, the profiles 53 and 54 have U or L-shaped profile sections 57, 58, which serve for better guidance and fastening of the side walls 6 to the profiles 53 and 54.

The cover profile 53 has recesses 59 complementary to the cross section of the plunger 5, these recesses either being able to be left blank during manufacture as a function of the production method of the profiles or can be introduced in a subsequent punching process.

In FIG. 13, a bottom mattress according to the present invention with a fold-up head part is shown in a schematic perspective view. The fold-up head part consists, in a manner known per se, of a folding frame part 60 which is fastened to the lower mattress via a hinge-like joint 61. The attachment takes place on two axially spaced plungers 5 and 5 'analogous to the attachment of the carrier elements 2. This arrangement retains the advantage of the present invention, namely the application of a defined counterforce, the counterforce now being between the two plungers to be regarded as adjacent plungers 5 and 5 'acts. Another advantage of this embodiment is that a flat, flat mattress under the present invention can be easily converted to a fold-up headboard at any time without great effort.

Finally, FIG. 14 shows a bed which is produced from three frames 65, 66 and 67, which are in principle independent of one another, according to the present invention, this frame is to be held in a manner known per se by lockable swivel joints 68 and 69 in positions defined relative to one another.

Claims (23)

Under mattress with at least one frame, which is spanned by rust-like arranged slat-like support elements, which are resiliently mounted in the area of their two axial ends on longitudinal members of the frame via rams movable essentially perpendicular to the plane of the frame on supporting cables or supporting straps attached to the frame,
characterized by
that each of the plungers (5.5 ') including the support cable (14) or support band (14') is articulated to a first end of at least one rocker arm (13, 13 ') movably arranged on the longitudinal beam (3, 4), the with the rocker arm (13, 13 ') connected end of the plunger (5.5') on the support band (14 ') or support cable (14) for support and at least the second end of the rocker arm not connected to the plunger (5.5') (13, 13 ') can be brought from below to the support cable (14) or support belt (14'). Under mattress according to claim 1,
characterized by
that the rocker arm (13, 13 ') has the shape of a curve with a variable radius of curvature, in particular the shape of a clotoid, in longitudinal section. Under mattress according to claim 2
characterized by
that the rocker arm (13, 13 ') is connected to the plunger in the region of its greatest radius of curvature. Bottom mattress according to one of claims 1 to 3,
characterized by
that the rocker arm (13, 13 ') has at least one roller bearing (15, 15'16, 16'; 37, 37 ', 38, 38') on at least one of its two ends, in particular in the form of a guide roller, for the supporting cable (14 ) or carrier tape (14 '). Bottom mattress according to one of claims 1 to 3,
characterized by
that the rocker arm (13, 13 ') has a groove-like recess (22, 24) in the region of its two ends and / or the tappet at its end connected to the rocker arm (13, 13'). Under mattress according to one of claims 1 to 5,
characterized by
that the longitudinal beams (3, 4) of the frame (1) have a box-shaped profile which is essentially rectangular in cross section. Bottom mattress according to one of claims 1 to 6,
characterized by
that the tappets (5, 5 ') have at least sections of their spring-like projection (30) on their side walls (28, 29) running parallel to the longitudinal direction of the lower mattress, which has complementarily arranged guide grooves (40) in the inner sides of the longitudinal walls (6) the side member (3, 4) can be brought into engagement. Under mattress according to one of claims 1 to 7,
characterized by
that the bottom (8) of the side member (3, 4) is designed as a sliding surface (17) at least in the area in which the rocker arms (13, 13 ') rest. Bottom mattress according to claim 8,
characterized by
that the sliding surface (17) on the bottom (8) of the side member (3, 4) and / or the associated bearing surface (18) of the rocker arm (13, 13 ') are convex. Bottom mattress according to claim 8 or 9,
characterized by
that the sliding surface (17) consists of an inserted, glued or otherwise fixed sliding plate made of a low-friction material, in particular of PTFE. Under mattress according to one of claims 1 to 7,
characterized by
that the bottom (8) of the longitudinal beam (3, 4) has roller-like roller bearing elements (19, 19 ') at least in the area in which it comes into contact with the rocker arms (13, 13'). Bottom mattress according to one of claims 1 to 11,
characterized by
that the rocker arm (13, 13 ') and the plunger (5.5') are connected to one another at their mutually facing ends by a clip-snap connection. Bottom mattress according to claim 12,
characterized by
that at least two protruding elastically expandable locking forks (35, 36) are arranged on the mutually facing ends of rocker arm (13, 13 ') and plunger (5.5'), which overlap each other in the assembled state, so that the eyes of the locking forks (35,36) of the rocker arm (13,13 ') and the plunger (5,5') are aligned with each other and can be pivotally connected by means of a plug-in axle (34,34 ') which extends through all locking forks (35,36), the The length of the locking forks (35, 36) is dimensioned such that a portal-like opening (15) for the passage of the support band (14 ') or support cables (14) remains between the plunger (5,5') and the rocker arm (13, 13 '). Bottom mattress according to claim 13,
characterized by
that a guide roller (37,37 ') is arranged on the plug-in axle (38,38') in the opening (15) for the passage of the support cable (14) or support tape (14 '). Under mattress of one of claims 1 to 14,
characterized by
that at the end of the rocker arm (13, 13 ') facing away from the tappet (5, 5') there are two projecting, elastically expandable locking forks (39) which have a plug-in axle (38 ', 38) which extends through both locking forks (39) carries a guide roller in the area between the locking forks (39), can be brought into engagement. Under mattress according to claim 14 or 15,
characterized by
that in the case of a support cable (14) the guide rollers are concave in coil section (37) and in the case of a support belt (14 ') the guide rollers are cylindrical or crowned (37'). Under mattress according to one of claims 1 to 12,
characterized by
that at least two projecting lugs (25, 24) are arranged on the mutually facing ends of rocker arm (13, 13 ') and plunger (5.5'), which overlap one another in the assembled state, one of the pairs of lugs (25) its in the assembled State the other pair of plates (26) opposite sides has excellent locking axes (27) and the other of the two pairs of plates (26) is designed as an elastically expandable locking fork which can be brought into a resilient locking engagement with the locking axes (27) of the first pair of plates (25) , The length of the tabs (25, 26) being dimensioned such that between the tappet (5, 5 ') and the rocker arm (13, 13') there is a portal-like opening (15) for the passage of the support band (14 ') or support cables (14 ) remains. Under mattress according to one of claims 1 to 17,
characterized by
an integrally formed housing box (45) which has a substantially rectangular cross section and is open on both end faces, the connecting elements (46, 47) in the form of grooves and / or springs or in the form of latching tongues and / or has locking slots and which contains a complete unit of the load-bearing device consisting of tappet (5), rocker arm (13) and associated guides (38) and bearing surfaces (17). Under mattress according to one of claims 1 to 17,
characterized by
that the longitudinal member (3) of the frame (1) consists of two essentially flat side walls (6), which have recesses (56) in their longitudinally extending narrow sides, and two cover profiles (53, 54), which are fastening elements (which are functionally complementary to the recesses) 35), the first cover profile (53) having the recesses (59) or guides for the plunger (5) and the second cover profile (54) the slide bearing surfaces (17) for the rocker arms (13). Under mattress according to one of claims 1 to 19,
characterized by
that the plunger (5,5 ') and / or the rocker arm (13,13') are made of plastic. Under mattress according to one of claims 1 to 20,
characterized by
that the support cable (14) or support tape (14 ') has an inherent elasticity between 10% and 30%. Under mattress according to one of claims 1 to 21,
characterized by
a tensioning device (33), which is preferably accessible from the outside, for the supporting cable (14) or carrying strap (14 '). Under mattress according to one of claims 1 to 22,
characterized by
that the slat-like support elements (2) with the plungers (5,5 ') are articulated in the manner of a joint head.

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