Portable low-pressure direct current pump

Claim 1

A small, low-pressure, portable gear pump, weighing about 12 pounds or less, for the pumping of water or other low-viscosity liquid, comprising: a generally cylindrical pump housing having a horizontal axis, said pump housing being formed of plastic; a liquid inlet to the interior of said housing along the axis thereof and a liquid outlet from the interior of said housing along the periphery thereof; a pair of adjacent interengaging plastic pumping gear wheels within said pump housing and in interconnecting driving relationship, the axes of said gear wheels being parallel to the axis of said housing, said pumping gear wheels being adapted to rotate at a high speed on the order of 2,500 r.p.m.; a drive housing mounted behind said pump housing, and a pump shaft mounted to one of said pumping gear wheels and passing through the backwall of said pump housing into said drive housing; means to rotate said pumping gear wheels At about 2,500 r.p.m. including a 12-volt, direct current, high-speed electric motor mounted behind said drive housing and having a motor shaft passing through the backwall of said drive housing; means for drivedly interconnecting said motor shaft and said pump shaft; a handle projecting backwardly from said gear housing; an external switch mounted on said motor operable as said handle is gripped in the hand; and an electric cord for providing electric power to said motor from a source of electric power, and means on the end of said cord for attachment to an automobile battery; wherein said means for drivedly interconnecting said motor shaft and said pump shaft comprises a first driving gear coaxial with one of said pumping gears and mounted on said motor shaft within said drive housing and a second driving gear adjacent said first driving gear within said drive housing and in driving interengaging relationship with said first driving gear, said second driving gear being mounted on said pump shaft for direct interconnection with said one pumping gear wheel mounted on said pump shaft; said pump housing comprising a cuplike member having an internal configuration complementary to said pumping gear and a pump cap carrying said inlet for closing the open end of said cuplike member; said means for attachment to an automobile battery comprising a cigarette-type lighter plug for plugging into the lighter of an automobile; said handle comprising the casing for said motor, said casing being provided along its bottom with finger grips; and a stand for said gear pump mounted to said gear housing.