Static molds – Core – Including means for attaching core to a support
Patent
1977-05-09
1978-10-10
Husar, Francis S.
Static molds
Core
Including means for attaching core to a support
29267, 249180, 249184, 249210, 267 71, 267169, B28B 730
Patent
active
041192931
ABSTRACT:
Hole forming devices have to be engaged between forms prior to pouring concrete. They are adapted to expand when in position to engage the inner faces of the forms thus holding them in position. The jack is a telescopic rod or tube having a heavy expansion spring surrounding same and normally urging the two portions of the hole forming device outwardly, but being held in the compressed or "set" position by means of a pin engaging through the two portions of the telescopic rod or tube. In one embodiment, when the pin is pulled, the sharpened ends of the rod or tube move away from one another, pierce the end caps of the forming device and engage the faces of the forms and at the same time move the end portions of the forming device outwardly into contact with the inner faces of the forms. In another embodiment, the ends of the rod or tube move outwardly and engage end pieces which in turn move outwardly and urge cylindrical saw-tooth end caps into contact with the inner faces of the walls of the form.
REFERENCES:
patent: 2070563 (1937-02-01), Cusack
patent: 3798738 (1974-03-01), Purtell
patent: 3921953 (1975-11-01), Diener
Ade Stanley G.
Husar Francis S.
McQuade John
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