Electrostatic paint spray apparatus having rotary spray head with an air seal
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United States of America Patent
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Jul 29, 1980
Grant Date -
N/A
app pub date -
Dec 14, 1978
filing date -
Dec 20, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Electrostatic paint spray apparatus having rotary spray head with an air seal. To prevent paint or solvent from entering antifriction bearings, the shaft rotating at high speed is provided with an air seal in an intermediate zone between the bearings and the spray head. Air from a source of compressed air communicating with inlet flows through channel into groove and from there via passageways into the annular air feed chamber. Air leaves the feed chamber between depending lip and shaft, preventing the entry of paint or solvent, and operating even when the apparatus is not spraying. Air is throttled in the other direction through the air flow path to an expansion chamber and then is vented to the atmosphere via vents without contaminating the bearings.
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