Static molds – Having inflatable element
Patent
1977-09-09
1978-10-31
Husar, Francis S.
Static molds
Having inflatable element
249100, 249144, B28B 718
Patent
active
041230337
ABSTRACT:
Improved apparatus for forming hollow cylindrical pipes of reinforced concrete wherein the pipe is formed in a vertical position and the principle components for forming the pipe comprise a bottom pallet and saddle, an outer jacket, a core positioned concentrically in spaced relationship within the outer jacket and a reinforcing cage positioned between the center core and the jacket and sealing means are provided for sealing the relationship between the bottom pallet, the outer jacket and the inner core. Use is made of movable elastic seals on the lower ends of the outer jacket and the core. The seals can be expanded inwardly toward the pallet by means of a positive pressure until the concrete has been poured into the form and compacted by vibration. Negative pressure is then utilized to withdraw the elastic seals from the formed pipe and the inner core and outer jacket are subsequently removed from the green pipe.
REFERENCES:
patent: 2865078 (1958-12-01), Hasselblad
patent: 3171169 (1965-03-01), Graef
patent: 3584356 (1971-06-01), Joelson
patent: 3651180 (1972-03-01), Glueckert
patent: 3764641 (1973-10-01), Ash
patent: 3833694 (1974-09-01), Hughes
patent: 3891736 (1975-06-01), Voaden
Husar Francis S.
McQuade John
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