Multiple nested pistons hand priming pump with spring biasing
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United States of America Patent
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-
Aug 6, 1996
Grant Date -
N/A
app pub date -
Feb 8, 1995
filing date -
Feb 8, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiple piston hand priming pump includes a plurality of nested pistons engaged within a hollow cylindrical housing. One end of the housing has an inlet/outlet fitting leading to a pumping chamber defined within the housing and the other end of the housing is closed. Through a center bore in the closed end of the housing, a plunger activating rod extends into communication with the centermost piston of the nested plurality of pistons. The nested pistons each engage within the next circumferential piston in a manner forming a lost motion connection therewith at the end of an axial bore in the next piston to cause sequential actuation after the pumping stroke of the inner piston is completed.
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