Arch forming assembly

Details Arch forming assembly Arch forming assembly

1980-05-02

1982-04-20

Perham, Alfred C.

Static structures (e.g., buildings)

Openwork; e.g., truss, trellis, grille, screen, frame, or...

Curvilinear or peaked truss

52 64, 52 86, 52645, 249 24, 249209, E04B 132, E04C 346

Patent

active

043252079

ABSTRACT:
A collapsible arch forming assembly comprising a flexible member and two tension line lengths with one tension line length threaded through even number guides, counted from one end of the flexible member and the other tension line length threaded through the odd number guides. Tensioning the tension line lengths arches the flexible member into the arch and this may be done by a winch assembly or inserting spreader bars at the guides to deflect the free one of the first and second tension line lengths at that position. The spreader bars may be replaced by, for example, mechanical jacks or fluid pressure actuated jacks particularly for such applications as using the arch forming assembly as formwork upon which concrete is poured.

REFERENCES:
patent: 1940033 (1933-06-01), Miller
patent: 2995797 (1961-08-01), Hoffmann
patent: 3057119 (1962-10-01), Kessler
patent: 3530622 (1970-09-01), Cohen
patent: 3849953 (1974-11-01), Cohen
patent: 3897622 (1975-08-01), Utahara
patent: 3973370 (1976-08-01), McAllister

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