Collapsible core seam cover for concrete making apparatus

Details Collapsible core seam cover for concrete making apparatus Collapsible core seam cover for concrete making apparatus

1996-03-01

1997-10-21

Mackey, James P.

Static molds

Uniting preform with molding material

249153, 249178, 249179, 425110, 425125, 425438, B28B 730, B28B 2188

Patent

active

056792794

ABSTRACT:
A shield or cover combined with a collapsible core used in machines for making concrete pipe lined with a plastic liner. The cover is mounted on the outside of the core between the core and the liner and extends the full length of the seam between the stationary side and the moveable side of the core. The cover extends around the core a sufficient distance to prevent friction between the liner and the moveable portion of the core from pulling the liner out of the concrete as the core is collapsed.

REFERENCES:
patent: 4578235 (1986-03-01), Schmidgall et al.
patent: 4657498 (1987-04-01), Schmidgall et al.
patent: 4705258 (1987-11-01), Frei
patent: 4917346 (1990-04-01), Mathis
patent: 5139404 (1992-08-01), Grau

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