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US 4,100,248 AGranted
Manufacture of grading and dewatering screens
AssigneeBirtley Engineering Limited
InventorTerence C. Adams
Life of this patent
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AssigneeBirtley Engineering Limited
InventorTerence C. Adams
Estimating the term…
An element for use in forming a deck for a grading or dewatering screen is formed by casting an elastomeric material such as polyurethane into a mould so that a smooth sheet of the material is formed in a liquid state in the mould, lowering into the liquid elastomeric material a substantially rigid open-work reinforcement, such as a perforated metal plate, and an array of studs for forming apertures in the screen element, the studs extending through the openings of the reinforcement and through the elastomeric material substantially to the bottom of the mould, allowing the elastomeric material to set, and then withdrawing the studs from the set sheet of elastomeric material. This provides a screen element comprising a sheet of elastomeric material having a rigid reinforcement embedded therein and a plurality of grading or dewatering apertures extending through the elastomeric sheet, the apertures being aligned with the openings in the reinforcement. Preferably the reinforcement has projections, such as flanges, extending substantially perpendicularly from it and from the rear face of the elastomeric sheet on at least two opposite edges of the element.
A method of making a reinforced elastomeric apertured screen element for a grading or dewatering screen, comprising the steps of providing a tray-like mould having a substantially horizontal bottom and upright side walls, forming in said mould a sheet of a wear resistant elastomeric material in a liquid state, providing above said mould both a plurality of studs for forming the apertures of the screen element and a substantially rigid open-work reinforcement defining a plurality of openings therein, lowering said reinforcement into contact with said liquid elastomeric material in said mould, lowering said studs whereby said studs penetrate said liquid elastomeric material substantially to said bottom of said mould, said studs extending through said openings of said reinforcement, allowing said liquid elastomeric material to set, and withdrawing said studs from the set sheet of said elastomeric material in said mould leaving said reinforcement and said elastomeric material permanently fixed together.
Dependencies are inferred from the claim text.