Pumping device that is operated easily and safely
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United States of America Patent
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Apr 16, 2013
Grant Date -
May 3, 2012
app pub date -
Oct 29, 2010
filing date -
Oct 29, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A pumping device includes a barrel, a top cover mounted on the top of the barrel, a first switching valve mounted on the top cover, a base mounted on the bottom of the barrel, a second switching valve mounted on the base, a cylinder connected between the top cover and the base, a piston movably mounted in the cylinder, a plurality of check valves mounted on the piston, an operation unit connected with the piston, and a conduit connected between the barrel and the base. Thus, a user has to pull or push the first switching valve and the second switching valve simultaneously to extract or suck the fluid in the barrel so as to deflate or inflate the barrel so that the pumping device has a security process and is operated in a safer manner.
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