Formwork and connecting means for forming annular structures

Details Formwork and connecting means for forming annular structures Formwork and connecting means for forming annular structures

1974-02-21

1976-01-06

Baldwin, Robert D.

Static molds

In situ construction engineering type or building type-mold...

249165, 249192, E04G 1104

Patent

active

039306330

ABSTRACT:
A plurality of formwork elements are provided, each of which is curved according to an arc of a circle and which are assembled to form an inner formwork wall and an outer formwork wall. Each of said formwork elements have two vertical edges provided with angled portions which form engaging faces, which engage engaging faces of horizontally adjacent formwork elements of the same formwork wall. Said angled portions of said formwork elements of said outer formwork wall extend outwardly. Said angled portions of said formwork elements of said inner formwork wall extend inwardly.

REFERENCES:
patent: 908326 (1908-12-01), Polk
patent: 1212397 (1917-01-01), Pierson
patent: 1236824 (1917-08-01), Davis
patent: 1535023 (1925-04-01), Kelley
patent: 1641927 (1927-09-01), Gremel
patent: 2102717 (1937-12-01), Jennings
patent: 2151210 (1939-03-01), Jennings
patent: 3045313 (1962-07-01), Dorn
patent: 3619431 (1971-11-01), Weaver et al.
patent: 3733163 (1973-05-01), Hermann

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