Pumps – Expansible chamber type – Mechanically actuated distributor
Patent
1997-01-06
1997-10-28
Gluck, Richard E.
Pumps
Expansible chamber type
Mechanically actuated distributor
417524, 417526, F04B 2104
Patent
active
056811543
ABSTRACT:
An air pump with dual air intakes includes a hollow pump body, a securing cover, a piston rod, a piston, an air outlet, a check valve, an air duct and a handle. The pump body has one end connected to the air outlet and the check valve. The peripheral rim of the pump body near the air outlet is provided with multiple air inlets. A diaphragm is disposed at the inner side of the peripheral rim. The other end of the pump body is connected to the securing cover provided with multiple air inlets. A diaphragm is secured to the inner side of the securing cover. Both diaphragms may cover the corresponding air inlets. The piston is connected to one end of the piston rod and is provided with an annular groove at its periphery. The annular groove has through holes communicating with the piston rod and is fitted with an annular gasket. The piston rod has fitted therein the air duct connecting to the air outlet. The other end of the piston rod projects from the pump body and connected to the handle. The piston displaces towards the securing cover, and the diaphragm is pulled open to allow entry of air via the air inlets. When the piston displaces reversely, the diaphragm is pulled open to allow entry of air via the air inlets.
REFERENCES:
patent: 3485180 (1969-12-01), Wickenberg et al.
patent: 3904325 (1975-09-01), Olofsson et al.
patent: 5165876 (1992-11-01), Wang
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