Importance

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Abstract

A drum rotating about a horizontal axis, designed to coat dragee pellets or other granules with a hardenable substance, has a polygonal--preferably nine-sided--peripheral wall and corresponding frustopyramidal end walls. The peripheral wall consists of angularly adjoining panels and has an access aperture extending partly over two such panels, this aperture being sealable by a gabled flap hinged to the drum at its trailing edge and adapted to be locked in a closed position by a sliding bolt coacting with a latching cylinder and an unlatching cylinder in a certain angular position of the drum whereby the unlatched flap will swing open on leaving that position and will swing closed on reapproaching it. Each panel is provided with a longitudinally extending grid, formed by a perforated sheet-metal strip, through which drying air is admitted from below into a granule bed; part of this air passes through slantingly disposed inwardly projecting perforated baffles which stir the granules and deflect them toward a transverse midplane of the drum where accompanying detritus can escape through the grids to the outside.

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First Claim