Patent ID: 6484744
Filing Date: 2002-11-26
Classification: F01M,F04B,F04F,Y10T

Abstract:
An oil pumping device comprising an oil storage tank; the oil storage tank being installed with an upper cover and a lower cover, a pump being installed between the upper cover an lower cover, the upper cover and lower cover sealing a top and a bottom of the pump, respectively, the pump being installed with a piston; the piston having a handle installed out of the upper cover; an interior of the lower cover having a unidirectional pressure relief valve with respect to the pump; an outer side of the pump of the oil storage tank being defined with a oil storage space, characterized in that:a top of the oil storage tank has an annular positioning wall extending upwards with a predetermined height; and a top of the pump is inserted into an interior of the positioning wall; and an outer peripheral surface of the pump has at least one recess; one section of the recess is enclosed by the positioning wall; another portion of the pump protrudes from the positioning wall to extend to the lower side of the positioning wall; the recess has an air inlet hole having a radial hollowed portion, thereby, the recess being communicated with the interior of the pump; and a unidirectional air inlet valve configured with respect to the air inlet hole is installed in an interior of the pump.