Pumps – Expansible chamber type – Valved piston
Patent
1997-08-29
2000-06-06
Freay, Charles G.
Pumps
Expansible chamber type
Valved piston
417570, 184 552, F04B 3910, F04B 5312
Patent
active
060710977
ABSTRACT:
A single-piece piston for use in a pneumatically-activated pump to meter a predetermined amount of lubricant or other liquid. The piston has a grooved end that includes a head portion and a circumferentially-disposed angled channel for containing a sealing member such as an O-ring. An adjacent stem section includes a longitudinally-disposed channel that is in fluid-flow connection with the angled channel. The piston is disposed within a chamber of the body of the pump. Lateral movement of the piston within the body causes the sealing member to shift and block and unblock the end of the longitudinal channel which allows liquid from a liquid chamber to flow into a slot and to a pump chamber adjacent to the head of the piston's grooved end. The piston operates in association with an assembly for regulating the amount of liquid metered by the pump, a valve assembly for evacuating the liquid from the pump chamber into and through an outlet fitting, and a mechanism for regulating the flow of air into the outlet fitting to atomize the liquid.
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Gruett Donald G.
Wech Michael
Wright Scott
Freay Charles G.
Oil-Rite Corporation
Torrente David J.
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