Static molds – Including removable or movable liner – Foraminous
Patent
1988-02-29
1988-11-29
Woo, Jay H.
Static molds
Including removable or movable liner
Foraminous
249141, 249189, 264 86, 425 84, E04G 910, B28B 736
Patent
active
047875976
ABSTRACT:
Concrete forms comprising a first cloth sheet permitting surplus water and air contained in concrete cast in the form to pass therethrough but capable of blocking the passage of the concrete, a second cloth sheet permeably secured to the first sheet, permitting the surplus water and air to pass between and through the first and second sheets and to be absorbed into the second sheet as well as the first sheet, and a support plate to which the second sheet is bonded as by adhesive or thermal bonding acting through only part of the thickness of the second sheet, leaving as water and air permeable throughout the remainder of the second sheet, all of the first sheet, and the interspace therebetween, such being effective as flow paths for surplus water and air to exhaust from the concrete cast in the form to thereby shorten the cure time and improve the strength of the concrete when cured.
REFERENCES:
patent: 2321277 (1943-06-01), Boyle
patent: 2349469 (1944-05-01), Sloan
patent: 2474721 (1949-06-01), Billner
patent: 2671940 (1954-03-01), Billner
patent: 2688175 (1954-09-01), Billner
patent: 3600771 (1971-08-01), Dyrander
patent: 3844527 (1974-10-01), Scott
patent: 4203714 (1980-05-01), Wenander
patent: 4730805 (1988-03-01), Yokota et al.
Horiya Shigekazu
Tanaka Kenjiroh
Yokota Takayoshi
Housel James C.
Kabushiki Kaisha Kumagaigumi
Woo Jay H.
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