Apparatus for controlled delivery of particulate material
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United States of America Patent
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-
Feb 15, 1994
Issued Date -
N/A
app pub date -
May 21, 1993
filing date -
Nov 23, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An apparatus that provides controlled volumetric delivery of particulate material, particularly for delivery of a particulate sample for analysis. The apparatus includes a sample receiving tubular member that is vibrated or rotated relative to the sample container to agitate and fluidize a surface portion of the sample placed in an elongated container. A transporting gas carries the fluidized sample from the container through the tubular member. Sample delivery rate is controlled by a traversing mechanism that gradually inserts the moving tubular member into the upper fluidized portion of the sample. The apparatus allows total delivery of a known mass of a particulate sample at a predetermined delivery rate.
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