Venting Apparatus Used for a Grease Gun
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United States of America Patent
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Issued Date -
Nov 29, 2012
app pub date -
May 27, 2011
filing date -
May 27, 2011
priority date (Note) -
Abandoned
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Abstract
A grease control structure of a grease gun comprises a main body including an inlet end and an outlet end. A high-pressure flow passage and a low-pressure flow passage having a larger outer diameter than the high-pressure flow passage are disposed between the inlet and outlet ends. The high-pressure flow passage includes a first inlet and a second inlet, and both passages include a first pump rod and a second pump rod respectively. The first pump rod is pivotally connected to a pressing handle and the second pump rod is pivotally connected to a pressing handle through a switch mechanism used for adjusting the pivotal position of the second pump and pressing handle to change their original position in the low-pressure flow passage for the second pump rod to precede the piston movement to close or open the second inlet and define a high- or low-pressure outlet pressure.
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