Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1978-03-16
1979-12-04
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
249145, 249155, 249156, 249159, 249177, 264299, B28B 704
Patent
active
041772296
ABSTRACT:
A method for producing precast manhole bases utilizing an apparatus consisting of a mold jacket defining vertical walls and a mold form disposed within the jacket. The form includes a central portion spaced inwardly from the jacket and channel forming members extending over the central portion with inserts attached to the channel forming members and extending into contact with the jacket walls. When concrete is poured over the mold form and allowed to solidify, the bottom wall of the base forms over the central portion with the channel forming members defining the channels in the bottom wall of the base. The channel forming members consist of a first member attachable in a fixed position on the central portion, this first channel forming member being shaped for defining an effluent channel and a central basin in the mold base. One or more additional channel forming members extend radially from the basin, and these include locking means for fixing the members in any desired position relative to the basin. The method includes utilizing a protractor means adapted to be attached to the first channel forming member. The protractor extends over the radially extending members, and these members can then be precisely located in any desired angular position relative to the first channel forming member and then locked in place.
REFERENCES:
patent: 1314725 (1919-09-01), Young
patent: 3363876 (1968-01-01), Moore
patent: 4077599 (1978-03-01), Oland
patent: 4085918 (1978-04-01), Wilkerson
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