Pumps – Motor driven – Fluid motor
Patent
1999-08-05
2000-08-08
Thorpe, Timothy S.
Pumps
Motor driven
Fluid motor
417553, 184 74, 184 552, F04B 1700
Patent
active
060992700
ABSTRACT:
A single-piece piston for use in a pneumatically-activated pump or other metering device to meter a predetermined amount of lubricant or other liquid. The piston is disposed within a chamber of the body of the metering device. 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 means for providing a fluid-flow connection with the angled channel. Lateral movement of the piston within the body causes the sealing member to shift and block and unblock the fluid-flow connection means, which allows liquid from a liquid chamber to flow out the head of the piston's grooved end and to an adjacent pump chamber. The piston operates in association with an assembly for regulating the amount of liquid metered by the lubricator, 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.
REFERENCES:
patent: 3335673 (1967-08-01), De Forrest
patent: 4105095 (1978-08-01), Thrasher, Jr.
patent: 4711321 (1987-12-01), Hedlund
patent: 5961299 (1999-10-01), Gruett et al.
Oil-Rite Corporation
Thorpe Timothy S.
Torrente David J.
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