Receptacles – Container attachment or adjunct – Expanding or contracting portion or component
Reexamination Certificate
2001-04-11
2002-06-11
Pollard, Steven (Department: 3727)
Receptacles
Container attachment or adjunct
Expanding or contracting portion or component
C220S004120, C220S530000
Reexamination Certificate
active
06401966
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a plastic pressure vessel structure, and more particularly to a plastic pressure vessel structure that can provide an efficient sealing effect.
2. Description of the Related Art
The closest prior art of which the applicant is aware is disclosed in U.S. Pat. No. 5,062,455 to Schurter et al., filed on Aug. 25, 1989, entitled “PRESSURE VESSEL WITH DIAPHRAGM COMPRESSION SEAL”. In the reference, it disclosed a pressure vessel
10
comprising upper and lower vessel shells
12
and
14
having facing open mouths received one within the other in a partially overlapping telescoped relation. The upper shell
12
has a lower wall section
16
received within and overlapping an upper wall section
18
of the lower shell
14
. A resilient flexible diaphragm
20
is disposed within the vessel and separates the latter into variable volume chambers
22
and
24
.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a plastic pressure vessel structure that can reduce the capillary phenomenon largely, so as to provide an efficient sealing effect.
In accordance with the present invention, there is provided a plastic pressure vessel structure, comprising:
a plastic outer barrel;
a diaphragm mounted in the plastic outer barrel for dividing the plastic outer barrel into an upper chamber containing a liquid therein, and a lower chamber containing a pressurized gas therein; and
a plastic inner barrel fully mounted in the plastic outer barrel and located in the lower chamber of the plastic outer barrel;
wherein, a wall of the plastic inner barrel and a wall of the lower chamber of the plastic outer barrel are overlapped with each other, such that capillary pores of the wall of the plastic inner barrel and capillary pores of the wall of the lower chamber of the plastic outer barrel are arranged in a staggered manner, thereby reducing a capillary action, so as to provide a tight sealing effect in the lower chamber of the plastic outer barrel, thereby preventing the pressurized gas contained in the lower chamber of the plastic outer barrel from leaking outward, and thereby preventing a pressure contained in the lower chamber of the plastic outer barrel from being reduced.
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 2880759 (1959-04-01), Wisman
patent: 3165229 (1965-01-01), Paul
patent: 4595037 (1986-06-01), LeBreton et al.
patent: 4667841 (1987-05-01), Belle
patent: 4817830 (1989-04-01), Yavorsky
patent: 5386925 (1995-02-01), Lane
patent: 6041820 (2000-03-01), Boehme
Pollard Steven
Rosenberg , Klein & Lee
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