Voussoir for a casing

Details Voussoir for a casing Voussoir for a casing

1975-03-19

1977-07-26

Shapiro, Jacob

52 86, 52 88, E21D 1122

Patent

active

040374173

ABSTRACT:
Casing voussoir of the type comprising a web in the general shape of a sector of a cylindrical ring and at least two juxtaposition walls substantially perpendicular to said web and parallel to each other, wherein the voussoir has guide means for the juxtaposition of said walls between two neighboring voussoirs of the casing, said guide means being constituted by at least two elements of conjugate shape, one being a hollow in one of the walls and the other being a projection on the other wall, said elements having a clearance therebetween when the two voussoirs are juxtaposed along said walls.

REFERENCES:
patent: 422901 (1890-03-01), Arnett
patent: 984337 (1911-02-01), Woodworth
patent: 1043348 (1912-11-01), O'Rourke
patent: 2077137 (1937-04-01), Wilkoff
patent: 2816329 (1957-12-01), Sogaro
patent: 3483704 (1969-12-01), Tabor

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