| CPC B67D 7/0205 (2013.01) [F04B 9/14 (2013.01); F04B 23/02 (2013.01)] | 6 Claims |
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1. A manually-operated dual-action suction/delivery fluid pump comprising:
a fluid container having a fluid reservoir space formed thereon, said fluid container having an opening formed at an upper end thereof, the fluid reservoir space extending to the opening;
a fluid conducting pipe extending into the fluid reservoir space and extending out of said fluid container, said fluid conducting pipe adapted to conduct a fluid into or out of the fluid reservoir space;
a cover removably attached to said fluid container so as to seal the opening of said fluid container, said cover having a first side and a second side opposite each other across a thickness of said cover, the first side facing the fluid reservoir space, said cover having an air-conducting channel and a first air-supplying pipe and a second air-supplying pipe and a third air-supplying pipe conducting respectively to the first side, wherein the first air-supplying pipe communicates with the air-conducting channel, the second air-supplying pipe communicating with the fluid reservoir space;
a pump unit attached to said cover and disposed on the first side thereof, said pump unit having a cylinder chamber with a piston adapted to provide a unidirectional passage of gas therein, the piston dividing the cylinder chamber into a first chamber and a second chamber, the piston being connected to a shaft rod that extends outwardly of said cover, the shaft rod connected to a handle, the piston reciprocable in the cylinder chamber so as to change a volume of the first chamber and the second chamber, the first chamber communicating with the air-conducting channel, the second chamber communicating with the third air-supplying pipe; and
a control valve positioned on the second side, said control valve having a tubular valve casing and a valve stem, the tubular valve casing attached to said cover, the tubular valve casing defining a valve chamber therein, the valve chamber communicating with an exterior space through opposite ends of the tubular valve casing, wherein the tubular valve casing has an annular wall and a first passage and a second passage and a third passage, the annular wall annularly surrounding the tubular valve casing, the first passage and the second passage and the third passage extending in a common direction toward the annular wall so as to communicate with the tubular valve casing respectively, the first passage and the second passage and the third passage extending toward a side of the annular wall facing the fluid reservoir space, wherein the first passage and the second passage and the third passage are in spaced relation with respect to the tubular valve casing, the second passage positioned between the first passage and the third passage, the first passage being in fluid communication with the first air-supplying pipe, the second passage being in communication with the second air-supplying pipe, the third passage being in communication with the third air-supplying pipe, wherein the valve stem of said control valve is reciprocably displaceable in the valve chamber, wherein opposite ends of the valve stem extend to an exterior of said tubular valve casing so as to define a first operating unit and a second operating unit, the valve stem radially and annularly encircling a first anti-leakage ring and a second anti-leakage ring and a third anti-leakage ring, the first anti-leakage ring positioned between the first passage and the first operating unit, the first anti-leakage ring being selectively urging or not urging against the annular wall so as to allow the first passage to communicate or to not communicate with the exterior of the tubular valve casing through the valve chamber, the third anti-leakage ring positioned between the third passage and the second operating unit, the third anti-leakage ring selectively urging or not urging against the annular wall so as to allow the third passage to communicate or not communicate with the exterior of the valve casing through the valve chamber.
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