Compound fluted mold for casting prestressed concrete lamp poles
AssigneeAmeron, Inc.
InventorsJames F. O'Conner, William A. Muller
Life of this patent
Estimating the term…
Abstract
A compound fluted mold segment for casting prestressed concrete lamp poles includes three 120.degree. circumferential sectors wherein each sector contains a mold form made of a thin gauge sheet metal in which are locaed flutes formed by a press-brake operation. A plurality of circumferential flanges are welded on the outside of the sheet meal for stiffening the mold form. Longitudinal gates extend radially outwardly from each edge of the circumferential sectors for connecting the sectors and stiffening the mold segment in a longitudinal direction. Mating annular shoulders are incorporated to maintain concentricity between the fluted mold segment and additional mold segments attached at the ends of the fluted segment.
Claims10
A sector of a mold for centrifugally casting fluted prestressed concrete poles comprising:
- an elongated sheet metal form formed into an arch extending a fraction of the circumference of a generally circular cross section and having a plurality of longitudinally extending flutes formed in the concave face of the sheet metal deeply enough to also deform the convex face of the sheet metal;
- means on the convex face of the sheet metal for stiffening the form in a circumferential direction;
- means on the convex face of the sheet metal for stiffening the form in a longitudinal direction;
- and
- means for connecting the form to adjacent forms for forming the periphery of a cavity in which a pole is centrifugally cast.
A mold for centrifugally casting fluted prestressed concrete poles comprising:
- a plurality of elongated sheet metal forms, each form extending 120.degree. around the circumference of a cavity in which a pole is centrifugally cast and having longitudinally extending flutes formed in both the concave and convex surface of the sheet;
- a plurality of annular flanges extending 120.degree. around an outside of each form and tack welded to the surface of the form for stiffening the form in a circumferential direction;
- a longitudinally extending gate welded along each side edge of each form for stiffening each form in a longitudinal direction;
- and
- means for connecting adjacent gates on adjacent forms together for assembling three forms for defining a mold cavity.
Dependencies are inferred from the claim text.