Applicator using pressurized air to aid in dispensing liquid
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
May 4, 2004
Grant Date -
Jun 5, 2003
app pub date -
Nov 27, 2001
filing date -
Apr 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An applicator has a tubular body containing a liquid to be dispensed. A non-return device is movably disposed in the tubular body rearwardly of and in contact with the liquid for preventing backflow of the liquid. A manually-displaceable piston member is displaceable in the tubular body in a forward direction for pressurizing air admitted into a chamber located in front of the piston member, and a normally closed valve communicates with the chamber and is openable by the force of the pressurized air to apply the pressurized air to the non-return device to urge the non-return device forwardly to thereby pressurize the liquid. A resilient member normally urges the piston member rearwardly to a rear stop position. An air passage communicates the chamber with the exterior of the applicator when the piston member is in the rear stop position, and the air passage is blocked by the piston member during displacement of the piston member in the forward direction. The non-return device comprises one or more kinds of greases, and a float having a front portion embedded in the greases and a rear portion to which is applied the pressurized air.
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