초록 ▼

An apparatus for dispensing granules onto a moving asphalt coated sheet includes first and second granule feed chambers containing granules that are fed to a discharge slot by first and second pockets. The pockets are formed in a slidable divider positioned between the feed chambers and the discharg

An apparatus for dispensing granules onto a moving asphalt coated sheet includes first and second granule feed chambers containing granules that are fed to a discharge slot by first and second pockets. The pockets are formed in a slidable divider positioned between the feed chambers and the discharge slot. The divider is slid between a first position and a second position by a fluid powered actuator via an actuator rod. In the first position, the first pocket is in communication with the first granule feed chamber to receive granules from the feed chamber and the second pocket is in communication with the discharge slot for discharging the granules contained in the second pocket. In the second position the first pocket is in communication with the discharge slot for discharging the granules contained in the first pocket and the second pocket is in communication with the second feed chamber to receive granules from the feed chamber.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for manufacturing an asphalt roofing material, comprising:coating a continuous base mat with liquid asphalt to form a tacky asphalt-coated sheet; anddischarging granules from a series of granule applicators onto the asphalt-coated sheet to form a granule-coated

[ What is claimed is:] [1.]1. A method for manufacturing an asphalt roofing material, comprising:coating a continuous base mat with liquid asphalt to form a tacky asphalt-coated sheet; anddischarging granules from a series of granule applicators onto the asphalt-coated sheet to form a granule-coated asphalt sheet, at least one of the granule applicators discharging blend drops of granules onto the asphalt-coated sheet, the discharging of a blend drop comprising:discharging granules through a discharge slot of a granule feed chamber onto the asphalt-coated sheet, and controlling the discharge of a blend drop of granules by moving a slidegate with an actuator between an open position in which the slidegate opens the discharge slot so that granules are discharged through the discharge slot, and a closed position in which the slidegate closes the discharge slot so that granules are not discharged through the discharge slot, wherein the actuator moves the slidegate between the open position and the closed position with sufficient quickness to produce a blend drop on the asphalt-coated sheet having a uniform distribution of granules.