Patent ID: 7270711

Claim:
In a rotational casting apparatus for coating a body with an elastomer comprising a main frame for supporting a body to be coated with elastomer, a mixing head in which a liquid elastomer is contained, and dispensing means operatively connected with said mixing head for dispensing liquid elastomer onto a body to be coated supported by said main frame, the improvement comprising: said dispensing means comprising nozzle means having interior flow passageway means through which the liquid elastomer from said mixing head flows; said interior flow passageway means comprising a plurality of discharge-passageways, each said discharge-passageway defining a longitudinal axis along the length thereof defined as the “z” axis, and having a main passageway section and an outlet-opening section; said main passageway section comprising a plurality of regions of different cross-sectional shapes, each said region having a series of similarly-shaped cross sections, said cross sections of said plurality of regions of different cross-sectional shapes generally increasing in cross-sectional area in a direction toward said outlet-opening section for at least a number of said cross sections along the length of said discharge-passageway; said outlet-opening section comprising an outlet opening having a substantially elongated-like shape; each said cross section of each said series of similarly-shaped cross sections of said plurality of regions of different cross-sectional shapes being defined by a width “x” and a height “y”; the “x” dimension of at least most of said cross sections of each said series of similarly-shaped cross sections of said plurality of regions of different cross-sectional shapes increasing in value along the “z” direction toward said outlet opening, and the “y” dimension of at least most of said cross sections of each said series of similarly-shaped cross sections of said plurality of regions of different cross-sectional shapes decreasing in value along the “z” direction toward said outlet opening.