Static structures (e.g. – buildings) – Shaped or strengthened by fluid pressure – Fluid pressure is subatmospheric
Patent
1988-12-14
1990-11-20
Ridgill, Jr., James L.
Static structures (e.g., buildings)
Shaped or strengthened by fluid pressure
Fluid pressure is subatmospheric
297440, E04B 1345, A47C 700
Patent
active
049708317
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the kind of bearing structure which is adjustable between a rest shape and an operational shape of greater volume and has at least one flat bearing part and at least one support part connected movable with and/or detachable from the same.
The problem of the invention is to provide a bearing structure of the kind mentioned which, without impairing the adjustability between a rest shape requiring little space and an operational shape of greater volume, is distinguished by high rigidity of form and especially rigidity or resistance against bending.
Essential to this solution is the distinguished anisotropy of direction of the flat bearing structure, as to the bending rigidity, in combination with the push-resistant connection, that is, rigidity against the transfer of tangential thrust tensions, and connection with bearing strength between the bearing structure and the support part. Also essential is an extension of a portion of the bearing structure connected with the support part at an angle (preferably at least approximately perpendicular) with the anisotropy of high bending rigidity of the same. As a whole, there is given through these features, in the operational shape, a shape of high strength rigid in form both against pressure and also against bending stresses which, through partially or complete loosening of the push-resistant connection, can be converted into a space-saving rest shape.
One variation of the problem of the invention is directed, in a bearing structure of the same kind, to being able to carry out simply and rapidly the adjustment between rest and operational shapes, and to reducing the construction expense for the stiffening of the bearing parts. A further development of the invention solving this problem is specified by the features of claim 6.
With this solution, a bearing structure anisotropic as to bending stiffness, according to the first solution, is also present. But here it is mainly a matter of the fact that a support part at least partly rigid, and its push-resistant connection wholly or partly detachable with the bearing structure, is no longer necessary. With this is given the desired simplification as to structure and handling. The hollow chamber of the bearing structure is filled with a pressure fluid to provide a stiffening of the operational shape curved or angled in sections. Thus, rigidity against bending is provided. But as compared with the first solution, this is relatively yielding without special precautions against pressure stress. This has hardly any disturbing effect in many applications and can be tolerated there in view of the special advantages.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be further explained from examples schematically represented in the drawing.
FIG. 1 shows a perspective view of a bearing structure designed as a hangar in operational shape;
FIG. 2 is a lengthwise vertical section of the bearing structure in operational shape according to FIG. 1;
FIG. 3 is a representation in perspective of the bearing structure, according to FIG. 1, in rest shape;
FIG. 4 is a partial view, on a larger scale from FIG. 2 in region A, looking in the direction of the arrow IV;
FIG. 5 is a partial section, on the scale according to FIG. 4, along the section plane V in FIG. 4;
FIG. 6 is a partial cross-section of the wall of a bearing structure according to the invention, in rest shape;
FIG. 7 is a simplified diagram of the wall section according to FIG. 6, but in operational shape;
FIG. 8 is a perspective view of another bearing structure designed as a hall in operational shape;
FIG. 9 is a lengthwise vertical section of the bearing structure in operational shape according to FIG. 8;
FIG. 10 is a perspective view of the bearing structure according to FIGS. 8 and 9, in rest shape;
FIG. 11 under (a) to (f), are perspectives of another bearing structure designed as a seat (a piece of furniture);
FIG. 12 is a cross-section of a hollow profile bearing structure according to the invention, in operational shape;
REFERENCES:
patent: 510427 (1893-12-01), Hine
patent: 2100979 (1937-11-01), Rowe
patent: 2324398 (1943-07-01), Kahr
patent: 2546811 (1951-03-01), Anderson
patent: 2733482 (1956-02-01), Doman et al.
patent: 3933401 (1976-01-01), Lampe et al.
patent: 3938860 (1976-02-01), Cobb
patent: 3973363 (1976-08-01), LaPorte et al.
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