Pressure deactivated torque override coolant cap
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United States of America Patent
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-
Sep 28, 2004
Grant Date -
Jan 22, 2004
app pub date -
Jul 18, 2002
filing date -
Jul 18, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cap for use on the threaded filler neck of a coolant reservoir, such as an automobile radiator, comprising a cover and main body and including: a means for transmitting torque from the cover to the main body to screw the cap onto the filler neck. The cap but for preventing excess torque from being transmitted. The cap includes a second torque transmission means for unscrewing the cap, which does not limit the torque that can be transmitted. The cap also includes a means for preventing the cap from being unscrewed when the coolant is under pressure; a pressure relief means to prevent the coolant pressure from exceeding a predetermined level; and a vacuum relief means for preventing the coolant pressure from falling below a second predetermined level.
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