Static molds – Having inflatable element
Patent
1982-02-22
1984-03-06
Hoag, Willard E.
Static molds
Having inflatable element
138109, 249187R, 277 343, 277 346, 425110, B29C 100, B29D 300
Patent
active
044349629
ABSTRACT:
Two flanges form together with an outer tube a sealed-off casting mold for applying an envelope to a pipe at least part of which is lodged in the mold. The lower flange is equipped with a feed-in duct system and the upper flange with an air-escape and overflow duct. The flanges consist of a material of rubber-like elasticity.
The duct system of the lower flange comprises a radially extending bore which opens in an annular distributory channel which merges with aerodynamic contours with a flow gap. The flow gap is of such configuration that it is closed when, and as long as, a higher pressure is exerted on the forward frontal face of the lower flange than prevails in the annular channel.
The flanges are so shaped in the regions of their sealing faces that the contact pressure exerted on them increases proportionally with the pressure exerted on one of the frontal faces.
REFERENCES:
patent: 2660458 (1953-11-01), Collins et al.
patent: 2816575 (1957-12-01), Stokes
patent: 2816780 (1957-12-01), Ross
patent: 3038732 (1962-06-01), Scott et al.
patent: 3572769 (1971-03-01), Lingl
patent: 4167430 (1979-09-01), Arachi
patent: 4226444 (1980-10-01), Bunyan
Bleuel Felix
Bosshard Christian
Ciba-Geigy Corporation
Falber Harry
Hoag Willard E.
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