Beds – Bedsteads – Having bottom
Patent
1996-04-11
1998-07-28
Meyers, Steven N.
Beds
Bedsteads
Having bottom
52361, A47C 2306
Patent
active
057847312
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a pneumatic sprung surface bearing having the following properties which are critical in terms of the objective:
BACKGROUND OF THE INVENTION
I. By virtue of its rough contour adaptability, it comes to bear even against highly uneven bodies with an only very slightly progressive adaptive-stroke/pressure-force relation.
I'. It possesses inherent, progressively acting damping during the adaptive stroke movement onto the body or during the shift of the latter.
II. An elastic component acting separately from the rough contour adaptation makes it possible to mount these bodies in a sprung manner.
III. It has both a negative and a positive displacement of the bearing element with a total stroke h of at least the non-loaded container height H and of up to 3/4 H.sub.tot of the total constructional height of the surface bearing.
The pneumatic sprung surface bearing is employed especially advantageously as an underframe for beds, couches or armchairs, where it allows optimum surface contour adaptation and bearing pressure equalizing, slightly sprung mounting in all the lying and sitting positions of the human or animal body. In the main use of the invention, that of a bed underframe or latticework, many mechanical aero- and hydropneumatic sprung individual bearing constructions are known. latticeworks primarily with elastic transverse laminated wood battens in rubber element mountings, common rubber band suspension of a plurality of crosslaths, and water beds. principles, but which pursue a similar objective to that of the surface bearing. A crosslath frame construction, in which the crosslath ends each rest on an individual piston/cylinder arrangement. The individual stroke volumes of the cylinders are connected hydraulically or pneumatically to one another and are provided with overflow ducts (WO 89/01749). on the principle of communicating vessels having a pneumatically displaceable concertina and on which individual crosslaths rest via supporting bars (EP 0 481,157). connected to one another via flow ducts for pressure equalization and for damping. In addition, vertical guidance and positive coupling of the stroke movement of the two crosslath ends are provided, in order to avoid the throwout effect (U.S. Pat. No. 3,210,889). 26) they are very much more complex than the surface bearing, have a markedly lower stroke/constructional-height ratio and achieve the properties I to III individually in part only, but in total not at all. of the pneumatic sprung surface bearing in modified form, but which do not have the critical features according to the invention and comply with none of the properties listed in points I to III. of side spars in the form of a U-profile, with a compressible tubular body, on which a plurality of crosslaths are directly laid individually and fixed in welded-on pockets and which can spring into indentations in the U-spars. A very similar construction is described in the U.S. Pat. No. 5,038,429, FIG. 1 (see also EP 0,378,469), but here the tubular body is also sub-divided, for each crosslath laid on, into individual "compartments" with overflow ducts (column 6, line 14 f.). directly and over a wide area. In the event of rapid alternating load, there is the risk that the tube will be pinched in the indentations and therefore become leaky. view only when the tubular body is "compressible", that is to say when it consists of an expandable material and/or contains a gas charge. profile on a gas-filled tubular body is described in EP 0,038,155. medium height, with the laths being laid on directly in pockets, is described in DE 2,621,803 and, advantageously from a technical point of view, is filled with a compressible medium. An aero bed consists of two air-filled, self-supporting longitudinal tubes, on which crosslaths rest. describes, furthermore, a tubular body subdivided into "compartments", in a hollow profile spar, on which individual pistons rest by means of rectangular supports over the entire tube width (see FIG. 4 and column 6, claim 1, l
REFERENCES:
patent: 5038429 (1991-08-01), Elmalek et al.
patent: 5052063 (1991-10-01), Elmalek et al.
patent: 5127114 (1992-07-01), Horburger
Meyers Steven N.
Pham Tuyet-Phuong
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