EP0825823B1 - Slatted frame - Google Patents

Abstract

To adjust the spring characteristic of slats (22) of a slatted frame the invention proposes to provide on adjacent slats (22) additional spring members (40) to be adjustable in the longitudinal direction of said slats. Said additional spring members co-operate with a suspended spring section (44) with a support strip (28) which is fastened to the framework of the slatted frame to extend between and below the slats (22). The support strips (28) have inclined strip sections (32, 36) to increase the adjustment range of the additional springiness.

Description

The invention relates to a slatted frame according to the preamble of claim 1.

One such is disclosed in EP 0 512 569B1. With him are the ends of the slats springy with the longitudinal spars of the frame of the grate connecting bearing elements as lying V-shaped leaf springs, which on their Bear the end caps that support the slat ends. The upper spring leg is designed like stairs, and are on the side end portions of the slats Additional spring elements slidable, depending on the position with the different levels of the stepped upper feather leg come into engagement. In this way, the Users the effective stiffness of a slat on simple Set way.

For some applications it would be advantageous if one the stiffness of the slats and thus the stiffness of the Adjust the lying surface locally in yet another area could.

To solve this problem, the invention Slatted base with the features specified in claim 1 created.

In the slatted frame according to the invention are with Additional spring elements cooperating support elements independent of the slat bearing elements. The one about the Additional spring elements created additional support path is thus mechanically parallel to that through the slat bearing elements formed spring travel switched, and on this way you can see the spring behavior in a very adjust large area.

Because the additional spring elements each on two neighboring Slats are guided, you can put them in between the Grip slatted areas of your head section well and move in the longitudinal direction of the slat without the head sections of the additional spring elements worth mentioning over the lying surface formed by the tops of the slats would need to be led out.

Since the spring sections of the additional spring elements also seen in supervision between the two an additional spring element leading slats are also the support elements arranged between the slats. The fasteners the support elements do not fall with the Fastening points for the slat bearing elements together, so that the longitudinal spars of the frame through the attachment points for slat bearing elements and support elements spaced locations can be used. This allows to work with longitudinal spars, their cross section is not larger than with conventional slatted frames.

Advantageous developments of the invention are in the Subclaims specified.

With the development of the invention according to claim 2 it is possible to make the additional spring elements particularly simple to be attached to the slats. In particular, when assembling a slatted frame the head sections of the additional spring elements on the last one already installed Latte can be pushed sideways, and when installing the following slat, this can be seen from the side Direction in the head sections of the just attached Additional spring elements are inserted. Can too the additional spring elements if their width is not is much larger than the distance between adjacent battens, between two neighboring battens by 90 ° to theirs Insert the working position rotated and then by 90 ° rotate the vertical axis, causing their guide grooves over the lower and upper slat surfaces are moved.

The development of the invention according to claim 3 is in With regard to a substantially smooth lying surface advantageous.

To design the spring sections of the additional spring elements according to claim 4, so you can about the thickness of the wall of the sleeve-shaped spring sections the spring properties the spring sections are easily predictable and variable in a wide range. Sleeve-shaped spring sections are also characterized by a large available Spring stroke off.

With an additional spring element, as specified in claim 5 is the overall dimension of the additional spring element particularly small in the longitudinal direction of the slats. Such additional spring elements can also be geometrically special manufacture simple molds, e.g. inject.

The further development of the invention according to claim 6 is in terms of ease of manufacture and handling the additional spring elements are an advantage.

The same applies to further training according to claim 7.

The design of the additional spring elements according to claim 8 is with regard to good long-term stability, avoiding noise when compressing, achievability the desired spring constants for the Use in slatted frames of practical dimensions, in Terms of maintaining a once elected Position of the additional spring elements on the slats Friction and with regard to ease of manufacture with Proven molding processes (spraying) are an advantage.

The development of the invention according to claim 9 is in With regard to simple and safe adjustment of the Additional spring elements on the slats are an advantage.

The training specified in claim 10 is the Gripping means particularly advantageous because you have such large contact surfaces for fingers without protruding Parts would have to be provided, which the continuity would affect the lying area.

The development of the invention according to claim 11 allows an even finer setting of the spring constants in an even larger area.

With the development of the invention according to claim 12 becomes a geometrically particularly simple and reliable Positive connection between the two spring sections the additional spring elements of a pair.

In the dimensioning of the interior specified in claim 13 of two cooperating spring sections of the additional spring elements of a couple you have a particularly strong one Increasing the rigidity of the interconnected spring sections.

If you design both spring sections like a sleeve, like specified in claim 14, so you have a particularly fine Adjustable stiffness of a slat when separated additional spring elements arranged on the crossbar Couple.

In a slatted frame according to claim 15, the overall arrangement the support elements are particularly simple. The support element arrangement simply includes on the side of the longitudinal spars attached support strips, the tops of which are in and come out of engagement with the additional spring elements, each after how these are set on the slats. This Support strips only need over the parts of the longitudinal bars to be provided where an additional setting the stiffness of the slats is desired.

You can according to claim 16 in a simple manner Use one and the same additional spring elements Vary the strength of the additional suspension in the longitudinal direction of the grate.

The development of the invention according to claim 17 allows adjusting the stiffness of individual slats in very wide frame, because a large for the additional spring elements Adjustment path is available within which it cooperate with the support strips.

If the support strips are exactly horizontal running support strips, so you get the variation the one obtained in addition to the self-suspension of the slats Additional suspension on the one hand due to the different Point of attack of the additional spring elements on the slats, on the other hand - with a resilient support strip - also due to the support strip deflection that becomes stronger towards the center of the support strips under pressure.

In a slatted frame according to claim 18 is by Additional spring elements simply caused additional suspension symmetrical to the median longitudinal plane of the slatted frame adjustable so that the additional spring elements are symmetrical to the longitudinal median plane of the grate, which is visual is easy to control.

With the development of the invention according to claim 19 a further enlarged setting range for the The stiffness of the slats is preserved since the time of Engagement of the additional spring elements with the support strips or a bias of the additional spring elements can be set before loading the lying surface can.

With the development of the invention according to claim 20 it is possible to add the additional spring elements in a lateral Parking area of the support bars in which they do not have any or only a little additional suspension.

Similarly, one can with a slatted base according to claim 21 the additional spring elements also in a middle area arrange the support strips in which one is not strong receives additional suspension depending on the position.

With a slatted base according to claim 22, one has another parameters determining the stiffness of the slats in the elastic deformability of the support elements themselves. Again, this is with regard to the area within which the additional suspension of the slats can be varied from Advantage.

The further development of the invention according to claim 23 is with regard to the largest possible adjustment range the additional suspension is an advantage. With conventional slatted frames finds the creation of mounting options today preferably for the slats on the grating longitudinal spars on numerically controlled machine tools. Used analog means for attaching the support strips as for the storage of the slats, so you can the attachment points for the support strips the same and in the same Operation, such as the fastening points for the slats, produce.

With the development of the invention according to claim 25 is achieved that the additional spring elements with the lateral ends of the support strips can work together. This is in view of the largest possible adjustment range the additional suspension to small values is an advantage.

The development of the invention according to claim 26 is with a view to simple and safe attachment of the Support strips on their fittings are an advantage.

With the development of the invention according to claim 27 is achieved that the adjustment ranges of the additional suspension in different longitudinal sections of the lying surface can be set differently without that differently shaped support strips and / or differently shaped additional spring elements required would.

In a slatted frame according to claim 28, the user even by arranging the support elements at different heights a rough adjustment of the spring characteristics make the additional suspension, in different Areas of the frame differ. To this Rough setting of the additional suspension still comes through given the displaceability of the additional spring elements Fine adjustment of the additional suspension so that one overall a very wide setting range of hardness the additional suspension.

Figur 1:

eine Aufsicht auf die Kopf- oder Fußseite eines Lattenrostes bei abgenommenem Querholm, wobei der besseren Übersichtlichkeit halber nur der Bereich einer Latte und einer dieser zugeordneten Stützleiste wiedergegeben ist;

Figur 2:

einen vertikalen Schnitt durch ein Zusatzfederelement des in Figur 1 gezeigten Lattenrostes;

Figur 3:

eine Aufsicht auf Abschnitte zweier benachbarter Latten und einer Stützschiene sowie eines Zusatzfederelementes des in Figur 1 gezeigten Lattenrostes;

Figur 4:

einen Schnitt durch den in Figur 1 gezeigten Lattenrost längs der dortigen Schnittlinie IV-IV;

Figur 5:

eine Aufsicht auf die Stirnseite eines Beschlagteiles, über welches eine Stützleiste des in Figur 1 gezeigten Lattenrostes an dem benachbarten Rostlängsholm befestigt ist;

Figur 6:

einen vertikalen Schnitt durch das in Figur 5 gezeigte Beschlagteil längs der dortigen Schnittlinie VI-VI;

Figur 7:

eine ähnliche Schnittansicht wie Figur 2, in welcher eine abgewandelte Lattenzusatzfederung dargestellt ist;

Figur 8:

eine ähnliche Schnittansicht wie Figur 2, in welcher eine nochmals abgewandelte Lattenzusatzfederung dargestellt ist;

Figur 9:

einen longitudinalen vertikalen Schnitt durch einen Lattenrahmen, bei welchem die Latten und ihre Lagerung weggelassen sind und nur die Anordnung über den Rost in Längsrichtung verteilter Stützleisten wiedergegeben ist; und

Figur 10:

eine Aufsicht auf eine teilbestückte Innenseite eines Längsholmes eines Lattenrostes.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the drawing. In this show:

Figure 1:

a top view of the top or bottom of a slatted frame with the cross member removed, for the sake of clarity only the area of a slat and a support strip assigned to it is shown;

Figure 2:

a vertical section through an additional spring element of the slatted base shown in Figure 1;

Figure 3:

a plan view of sections of two adjacent slats and a support rail and an additional spring element of the slatted base shown in Figure 1;

Figure 4:

a section through the slatted frame shown in Figure 1 along the section line IV-IV;

Figure 5:

a top view of the end face of a fitting part, via which a support strip of the slatted frame shown in Figure 1 is attached to the adjacent grating longitudinal spar;

Figure 6:

a vertical section through the fitting shown in Figure 5 along the section line VI-VI;

Figure 7:

a sectional view similar to Figure 2, in which a modified slat additional suspension is shown;

Figure 8:

a similar sectional view as Figure 2, in which a further modified slat suspension is shown;

Figure 9:

a longitudinal vertical section through a slatted frame, in which the slats and their storage are omitted and only the arrangement over the grate longitudinally distributed support strips is shown; and

Figure 10:

a view of a partially equipped inside of a longitudinal spar of a slatted frame.

In the drawings, a total of 10 is one frame Called slatted frame. This includes longitudinal spars 12, 14 and a cross member 16 and a corresponding, in second cross bar broken away from the drawing.

Fitting parts are on the outside of the longitudinal spars 12, 14 18 put on, which in turn made of natural or synthetic Bear rubber-made bearing elements 20. This consist in a known manner from one in the drawing unspecified spring truss and an upper one Bearing cap, in each of which one end of a crossbar 22 takes place. The two ends of the slats 22 are stored in a symmetrical manner. The slats are self-bouncing trained, e.g. correspondingly thick plywood parts, the slats in practice, seen from above, are slightly convex. By bending the slats and deformation of the bearing elements is thus obtained deformable formed by the tops of the slats 22 Lying surface.

Lying below the slats 22 and seen from above lying between the slats are over fitting parts 26 attached to the longitudinal spars 12, 14 support strips 28. The support strips 28 have the longitudinal spars 12, 14 adjacent lateral end portions 30, which in horizontal Direction. These are connected upwards increasing, ledge sections 32 that are above medium Ledge sections 34 into ledge sections sloping towards the center of the grate 36 pass over. The ends of the latter are through a central horizontal ledge section 38 connected.

As can be seen from the drawing, the support strips 28 overall symmetrical to the longitudinal median plane of the grate educated.

There is one between each two adjacent slats 22 Additional spring element 40 arranged, such as in particular Figures 2 to 4 clearly visible. The additional spring elements 40 each have a total of 42 Head section and a sleeve-shaped hanging on this Spring section 44. The end faces of the head section 42 and spring section 44 lie in common planes; also the dimensions of the head section 42 and spring section 44 in the direction transverse to the longitudinal direction of the batten are the same size.

The entire additional spring element 40 has two planes of symmetry: the one running in the vertical direction between the neighboring ones Slats 22 axial central plane and the plane of the drawing of Figure 4 parallel center plane.

In the head section 42 are two lateral guide grooves 46 provided in which the lateral edge portions Find adjacent slats 22. The guide grooves 46 overlap these edge sections in a light friction fit.

In the middle area between the battens 22 of the head section 42 are two spherical ones which are open at the top Gripping troughs 48 are provided. The fingers can be on these attacking a user to an additional spring element 40 to move in the longitudinal direction of the slats 22.

As can be seen from FIG. 4, the one labeled 50 lies upper boundary surface of the head section 42 only slightly above the lying surface 24.

In the exemplary embodiment considered here, the diameter of the spring portion 44 and the vertical position the support bar 28 matched so that at the left position in Figure 1 of an additional spring element 40 this without deformation just the last section 36 touches. If you move the additional spring element 40 outwards from this position, so the Spring section 44 increasingly under tension. In the position shown in the right half of Figure 1 an additional spring element 40 has this maximum bias. The fact that the additional spring element 40 still Moving further out, you can then use the preload reduce the spring section 44 again, with Positions of the same preload of the spring section 44, from the ledge section 34 in the outward direction or inward direction lie offset, through the point of attack distinguish the additional spring element 40 on the slat 22, so that you can go through positions on the groin section 32, the pre-stressed places on the last section 36 would be comparable, a harder additional suspension the lath receives 22. The end section 30 is again so matched to the additional spring element 40 that there the spring section 44 is unloaded.

You can see that with the pairs in between adjacent slats 22 arranged additional spring elements 40, which is generally symmetrical to the longitudinal median plane of the Rust can be set, an adjustable within wide limits Additional suspension for the battens 22 receives the to the by the flexibility of the slats 22 and the bearing elements 20 received slat base suspension is added.

In the embodiment shown in Figure 1 are the bearing elements 20 on the outside of the longitudinal spars 12, 14 attached so that the ends of the slats 22 to can extend directly to the edge of the grate, what with regard to a continuous lying surface of juxtaposed beds is an advantage. Below the bearing elements 20 are lateral support strips 52 shown, which are firmly connected to the longitudinal spars 12, 14 are and serve to frame 10 on a bed frame to store.

As can be seen from Figure 3, one can that the additional spring elements 40 in the longitudinal direction of the grate different settings, the additional suspension of the slats 22 vary in the longitudinal direction of the grate, e.g. in the shoulder area specify a particularly soft deflection of the slats 22.

The support strips 28 are preferably not rigid, rather bendable strips made of plywood themselves, however, the rigidity of the support strips 28 is considerable is chosen higher than the stiffness of the slats 22.

The additional spring elements 40 are made of natural or synthetic One-piece molded parts with rubber injection a Shore hardness between 60 and 80, preferably 70.

In practice, the outer diameter of the spring section 44 are about 50 mm, its wall thickness is about 5 mm, the dimension of the additional spring element 40 in the longitudinal direction of the slat can be about 20 to 25 mm.

The fitting parts cooperating with the support strips 28 26, which are shown in more detail in FIGS. 5 and 6, are one-piece molded parts made of hard thermoplastic Material. The fitting parts 26 have an assembly section 54, the two spaced in the longitudinal direction of the bar Mounting pin 56 carries the press fit into the corresponding Blind bores of the longitudinal spars 12, 14 can be used. A horizontal, integrally formed on the mounting portion 54 58 supports the underside of an end portion 30 a support bar 28 from. Side walls 60, 62 of the fitting parts 26 encompass the lateral longitudinal surfaces of the support strips 28, which - as can be seen from the drawing - are rounded in a circle. At the top front ends the side walls 60, 62 each have a locking lug 64, the one with by rounding the side wall formed, longitudinal bevel of a Support strip 28 cooperates in the manner of a snap lock. The height of the side walls 60, 62 is only slight higher than the thickness of a support strip 28, so that the top of the support bar 28 is substantially smooth extends to the inner surface of the longitudinal spars 12, 14.

The setting of the spring characteristics of slats one Slatted base was made with reference to the above Figures 1 to 6 in connection with an inclined sections having supporting strip described. It goes without saying that one has an adjustability of the spring characteristic of the Slats in a smaller adjustment range also together with a straight support strip can realize, as in Figure 2 indicated by dashed lines. In this case results the change in the spring characteristics of the slats 22 from the different depending on the position of the additional spring elements Point of application of the additional spring force and from the rigidity of the support strip used in each case.

Figure 7 shows a simplified embodiment, at which is just two different spring characteristics the slats 22 can be adjusted. There are only two Support strips 28 are provided, which extend in the longitudinal direction of the longitudinal spar 12 or 14 extend. There is an additional spring element 40 over the support bar 28, as in Figure 7 represented by solid lines, so is by this additional spring element 40 the rigidity of the two it increases leading slats 22. Is the additional spring element 40 pushed away from the support strip 28 towards the middle of the grate, it does not exert any additional spring force on those leading it Slats 22 out. The spring characteristic of the slats 22 is then only by their inherent rigidity and the Spring characteristics of the bearing elements 20 predetermined.

In the embodiment of Figure 7 you can Support strip 28 in those areas in which in general no additional spring force is required, omit.

In the additional suspension for slats shown in FIG. 8, which by modification of the additional suspension according to figure 2 is obtained, components are already above have been explained, again provided with the same reference numerals. You therefore do not need to go into detail again below to be described.

In addition to the additional spring element 40 is another Additional spring element 40 'reproduced for its components the additional reference marks with a comma of the additional spring element 40 can be used.

The additional spring element 40 'is the sleeve-shaped spring section 44 'around the longitudinal extent of the additional spring element 40 continued to the inside of the grate. The outside diameter the spring section 44 'is slightly smaller than the inside diameter of the spring section 44, so that the spring section 44 'is essentially positive can be inserted into the spring portion 44. With additional spring elements 40 and 40 'pushed together (indicated by dashed lines in FIG. 8) one thus has in the axially overlapping sections of the spring sections 44 and 44 'a sleeve-shaped spring which is subjected to bending, the total wall thickness in the considered embodiment is about twice the wall thickness of the spring section 44 or 44 'alone. In this way you get a strong increase in the rigidity of the the pushed together additional spring elements 40 and 40 ' formed additional spring unit.

Optionally, the additional spring elements 40 and 40 ' also provide spaced apart on the slats 22, as shown in Figure 8 by solid lines. In this case, the additional spring element 40 ' in the position shown on the slats 22 later in engagement with the support bar 28, whereby one after receives a spring action activated spring action.

The general rules apply to the exemplary embodiment according to FIG Comments regarding the setting of the spring characteristic of the individual slats alike, the above with reference to Figures 1 to 6 already were given. In particular, the additional spring elements 40 and 40 'generally symmetrical to the median longitudinal plane of the grate set.

In the exemplary embodiments described above, this was done the different setting of the spring characteristic the slats 22 in different areas of the slatted frame in that the position of the additional spring elements 40 or 40 and 40 'in the longitudinal direction of the slats 22 chose differently. Around the adjustment range of the spring characteristic for different rust areas Being able to vary more can be done in different ways Support areas with different shapes of rust areas use, e.g. in rust areas where only one less adjustability of the additional spring force desired with a straight line from one longitudinal spar to the other Longitudinal spar support strips 28 work in Rust areas in which a large adjustment range of the Additional spring force is desired, with support strips 28 work, which have the shape shown in Figure 1. Other geometries of the support strips can be used state the principles outlined above.

In the exemplary embodiment according to FIG. 7 one can in different Longitudinal areas of the longitudinal spar support strip segments provide at different heights or in the Milling indentations on the top of the support bar or double the support bar locally.

FIG. 9 shows an example of a shift of the Additional force spring range to lower values for the Outlined shoulder area. Over the entire grate area identical support strips 28 are used throughout; the Attachment of the support strips 28 takes place in the shoulder area however at a lower point of the longitudinal spars 12, 14 than in the other areas of the longitudinal spars 12, 14 come up with the same position of the additional spring elements 40 the slats 22, the spring sections 44 of the additional spring elements 40 only later in attachment to the top of the Support strips 28 so that these in the shoulder area, such as desired, compress more easily.

As from the above description of exemplary embodiments the local adjustability becomes apparent the hardness of the lying surface by the user with very simple and robust means. The production The slatted frames described above can be partially with those used anyway for machining the longitudinal spars Do NC-controlled woodworking centers. The assembly of the support strips 28 and the additional spring elements 40 is similar to that of the slats 22. The extent in which the lying surface can be adjusted in hardness should be easy to use using standard components vary. This can still be done during assembly of the frame to determine whether a hardness setting only for the shoulder area, also for the pool area or for other areas of the grate should be done.

The adjustment of the support strips 28 in the vertical direction can still be done by the user if one according to the left side of Figure 10, the hardware 26 trained so that they each have two sets of supporting walls 58 and side walls 60, 62 which are different far in one direction or the other from the Mounting pin 56 are spaced. By turning the Fitting parts 26 by one to the drawing plane of FIG. 10 vertical axis through 180 °, the fittings 28 from a first position shown on the far left in FIG. 10, in which the ends of the support strips 28 are mounted higher are, in a second, shown half left in Figure 10 Implement position in which the ends of the support strips 28 are lower.

Instead, the user can be different Provide fitting parts 28, in which the Support walls 58 lying different on the same side Have a distance from the mounting pin 56. In figure 10 is a fitting part for high support bar support 28 with 26-H, a fitting for normal storage of the Support strips 28 with 26-N and a fitting part for deep storage the ends of the support strips 28 designated 26-T.

When using the fitting parts shown in Figure 10 you can also the longitudinal bar 14 in the area of the fittings 26 with continuously arranged as standard Blind holes 66 provided while for attachment of the bearing elements 20 blind holes 68 in the upper spar area are provided which receive the fitting parts 18.

In the above-described embodiments the slats 22 were each exact when the grate was not loaded shown horizontally aligned. It goes without saying that by vertically moving the support points for the ends of the support strips 28 and locations of the additional spring elements 40 to the higher areas of the support strips 28 can also bias the slats 22 so much that they a geometry that is convex from above in the unloaded state to have. This is when the starting hardness is high Suspension is desired, advantageous.

Claims (28)

1. Slatted base having a frame (10), which is formed by longitudinal members (12, 14) and transverse members (16) connected to one another, and having a plurality of sprung slats (22), of which the top surfaces form a sleeping surface (24) and the ends are connected by bearing elements (20) in each case to an adjacent longitudinal member (12, 14), wherein at least one of the slats (22) cooperates with at least one, preferably two or an even number of additional spring elements (40), which are displaceable in slat longitudinal direction and cooperate with a support element (28) carried by the frame (10), characterized in that the at least one additional spring element (40) in a top head portion (42) has two lateral guiding means (46), which extend in slat longitudinal direction and cooperate with two adjacent slats (22); that the head portion (42) of the at least one additional spring element (40) is connected in each case to a spring portion (44) hanging down between the two slats (22) guiding the head portion (42); and that the support element (28) associated with the at least one additional spring element (40) is disposed underneath and, in plan view, between the two slats (22) guiding the head portion (42).
2. Slatted base according to claim 1, characterized in that the guiding means of the head portion (42) are formed by laterally open guide grooves (46).
3. Slatted base according to claim 1 or 2, characterized in that the top surface of the head portion (42) is flat and projects only slightly above the top surface of the slats (22).
4. Slatted base according to one of claims 1 to 3, characterized in that the spring portions (44) are sleeve-shaped.
5. Slatted base according to claim 4, characterized in that the axes of the sleeve-shaped spring portions (44) extend parallel to the slat axes.
6. Slatted base according to claim 5, characterized in that the head portions (42) and the spring portions (44) have the same dimension in the direction perpendicular to the bearing axis and in the direction parallel to the sleeping surface (24).
7. Slatted base according to claim 5 or 6, characterized in that the head portions (42) and the spring portions (44) have the same dimension in slat longitudinal direction.
8. Slatted base according to one of claims 1 to 7, characterized in that the additional spring elements (40) are integral shaped parts made of elastomeric material, preferably of natural or synthetic rubber preferably having a Shore hardness of 60 to 80, with a Shore hardness of 70 being particularly preferred.
9. Slatted base according to one of claims 1 to 8, characterized in that the head portions (42) are provided with gripping means (48).
10. Slatted base according to claim 9, characterized in that the gripping means are recessed grips (48), which are formed in the end faces of the head portions (42) and are open towards the top surface of the head portions (42).
11. Slatted base according to one of claims 1 to 10, characterized in that at least some of the slats (22) cooperate with pairs of additional spring elements (40, 40'), which are displaceable either independently or jointly along the slats (22), the spring portions (44') of an additional spring element (40') upon moving of the two additional spring elements (40, 40') into an abutting relationship being mechanically coupled to the spring portion (44) of the other additional spring element (40).
12. Slatted base according to claim 11, characterized in that the outside diameter of the spring portion (44') of the one additional spring element (40') of a pair is smaller than the inside diameter of the sleeve-shaped spring portion (44) of the other additional spring element (40) and projects in slat longitudinal direction from the end face of the one additional spring element (40').
13. Slatted base according to claim 12, characterized in that the projecting portion of the spring portion (44') of the one additional spring element (40') has the same dimension in slat longitudinal direction as the spring portion (44) of the other additional spring element (40).
14. Slatted base according to one of claims 11 to 13, characterized in that the spring portion (44') of the one additional spring element (40') is likewise sleeve-shaped and preferably has approximately the same wall thickness as the spring portion (44) of the other additional spring element (40).
15. Slatted base according to one of claims 1 to 14, characterized in that the support elements (28) comprise support rails extending in longitudinal direction of the longitudinal members (12, 14) of the frame (10).
16. Slatted base according to claim 15, characterized in that the surface of the support rails (28) extending in longitudinal direction of the frame (10) has portions ascending and/or descending in longitudinal direction.
17. Slatted base according to one of claims 1 to 16, characterized in that the support elements (28) comprise support rails extending parallel to the slats (22).
18. Slatted base according to claim 17, characterized in that the support rails (28) are symmetrical relative to the longitudinal centre plane of the frame (10).
19. Slatted base according to claim 17 or 18, characterized in that the support rails (28) have at least one inclined rail portion (32, 36).
20. Slatted base according to claim 19, characterized in that lateral end portions (30) of the support rails (28) extend horizontally and their length is at least equal to the dimension of an additional spring element (40) in slat longitudinal direction.
21. Slatted base according to claim 19 or 20, characterized in that a middle rail portion (38) of the support rails (28) extends horizontally and its length is at least equal to twice the dimension of an additional spring element (28) in slat longitudinal direction.
22. Slatted base according to one of claims 1 to 21, characterized in that the support elements (28) are elastically deformable.
23. Slatted base according to claim 22, characterized in that the support elements (28) have a greater stiffness than the slats (22).
24. Slatted base according to one of claims 1 to 23, characterized in that the support elements (28) are support rails, which extend parallel to the slats (22) and the ends of which are connected by fittings (26) to the longitudinal members (12, 14) of the frame (10).
25. Slatted base according to claim 24, characterized in that the fittings (26) comprise upwardly open receivers (58 to 62), in each of which one end portion (30) of a support rail (28) is seated in a substantially flush manner.
26. Slatted base according to claim 25, characterized in that the support rails (28) at least at their top longitudinal edges have a chamfer and the receivers (58 to 62) have detent lugs (64) cooperating with said chamfers.
27. Slatted base according to one of claims 24 to 26, characterized in that at least some of the support rails (28) are connected at a different height to the longitudinal members (12, 14) of the frame (10) and/or have a differently contoured surface.
28. Slatted base according to claim 27, characterized in that the support rails (28) are attached to the longitudinal members (12, 14) by a plurality of fittings (26), which for the support rails (28) have bearing surfaces (58) which are at a differing distance from mounting pins (56) of the fittings (26).

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