Bellows-type pump
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United States of America Patent
Stats
-
Jan 8, 1991
Grant Date -
N/A
app pub date -
Jun 23, 1989
filing date -
Jun 23, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bellows-type pump having a support ring positioned interiorly within the coil of the plastic bellows. The support ring is initially coiled to a diameter smaller than the normal bellows coil diameter. The free ends of the support ring have a telescopic relationship so that, when expanded to form a complete loop for supportive engagement within the bellows coil, the oppose free ends of the loop circumferentially engage one another and are positively held in telescopic engagement due to the circumferential hoop stress of the support ring.
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Family
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Cited Art Landscape
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