Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Making hole or aperture in article
Patent
1975-09-24
1977-08-02
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Making hole or aperture in article
264163, 264296, B28B 148
Patent
active
040396088
ABSTRACT:
The means for creating perforated concrete casing comprises a hollow cylindrical canister having a plurality of spaced apart rows of elongated openings formed therein. The elongated openings in each row are horizontally disposed and are vertically spaced. A first support means is secured to the outside surface of the canister adjacent each row of openings. A plurality of vertically spaced plates are mounted on each of the first support means and are selectively movable into and out of the openings of the associated row. A second support means extends upwardly through the canister and has a plurality of vertically spaced wedges mounted thereon. The second support means is movable towards the canister so that the wedges will penetrate the stiff concrete positioned adjacent the inside surface of the canister so as to create tapered perforations therein. Means is provided for rotating the canister so that the wedges may successively communicate with the row of perforations created by the plates on the first support means. The method comprises the steps of: (1) extending the plates on all of the first support means into the elongated openings formed in the canister; (2) depositing a layer of stiff concrete adjacent the inside surface of the canister so that the plates are imbedded therein; (3) removing the plates from the stiff concrete thereby creating rows of perforations in the concrete; (4) extending a row of vertically spaced apart wedges through the stiff concrete from the inside surface thereof so that the wedges communicate with the perforations so as to enlarge the same and to alter the shape thereof; (5) removing the wedges from the perforations; (6) repeating the wedging process until all of the perforations have been enlarged and altered; and (7) removing the canister from the stiff concrete.
REFERENCES:
patent: 2181959 (1939-12-01), Arborio
patent: 2595923 (1952-05-01), Carlson
patent: 3014260 (1961-12-01), Gustad
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