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US 4,123,033 AGranted
Apparatus for forming hollow cylindrical pipes of reinforced concrete
OwnerCarl R. Joelsoninventor
Life of this patent
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OwnerCarl R. Joelsoninventor
Estimating the term…
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.
In the apparatus for forming a reinforced concrete pipe in a vertical position comprising a removable inner form, a removable outer form and a support for the lower end of said pipe, a sealing assembly for the lower end portion of each of said forms comprising a depending seal plate assembly attached to and extending along one surface of the lower end portion of each of said forms in a continuous manner, said one form surface being opposite the surface of each form which will be in contact with a forming pipe, a flexible and continuous sealing member attached to each seal plate assembly and forming a chamber between said seal plate assembly and said flexible sealing member and means to cause said flexible member to be extended into contact with each said support upon which the pipe is to be formed and to be withdrawn from such contact with said support.
Dependencies are inferred from the claim text.