Blow tube arrangement for core and mold making machinery
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United States of America Patent
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Aug 13, 1991
Grant Date -
N/A
app pub date -
Aug 31, 1990
filing date -
Aug 31, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A blow tube arrangement and method for controlling the flow of granular mold material to the cavity of a mold or core making machine, in which one or more transverse openings are formed in the tip of the blow tube, which allow flow into the cavity when the tip is inserted into the cavity but which are covered as the tip is withdrawn. A spring urged covering sleeve receives the tip as it is withdrawn from the mold pattern structure to maintain closure of the tip openings.
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