Seal for a joint or juncture – Seal between fixed parts or static contact against... – Contact seal for a pipe – conduit – or cable
Reexamination Certificate
1999-10-08
2001-06-26
Brittain, James R. (Department: 3626)
Seal for a joint or juncture
Seal between fixed parts or static contact against...
Contact seal for a pipe, conduit, or cable
C277S605000, C277S610000
Reexamination Certificate
active
06250646
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a gasket structure, and more particularly to a gasket for a high pressure-high temperature pipe.
2. Description of Related Art
Referring to
FIG. 8
, a conventional gasket assembly squeezed between two pipe flanges to seal the pipe joint and stop leaks at the joint includes a spiral washer (
50
) with a stuffing therein and at least one collar (
52
) securely mounted on the outer or inner periphery of the washer (
50
). However, because the conventional gasket assembly lacks of axial resilience, the bond between two pipes will deform the washer (
50
) when the conventional gasket assembly is used in a high pressure-high temperature pipe system, such that the gasket assembly will easily be destroyed by the pressure of the two pipe flanges. Furthermore, when a pipe joint is disassembled, the used gasket assembly must be replaced with a new one before the pipe joint is reassembled. This will increase the cost of the gasket assembly for the pipe system.
Another conventional gasket assembly, as shown in
FIG. 9
, includes a spiral washer (
50
) with a stuffing therein and at least one spiral seal (
54
) securely mounted on the outer or inner periphery of the washer (
50
). However, the disadvantage of this conventional gasket assembly is the same as that of the conventional gasket assembly as shown in FIG.
8
.
To overcome the shortcomings, the present invention tends to provide an improved extension cord housing to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
In accordance with one aspect of this present invention, the high pressure-high temperature gasket comprises a hollow annular member, so that the gasket has an axial resilience and can resist the pressure of the combination of two pipe flanges such that the gasket can be reused.
In accordance with another aspect of this present invention, the high pressure-high temperature gasket further comprises a multi-layer washer securely mounted on the outer or inner periphery of the annular member, so that the washer enhances the resilience of the gasket.
In accordance with further aspect of this present invention, the high pressure-high temperature gasket comprises a stuffing member stuffed into the annular member to improve the resilience thereof.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in joint with the accompanying drawings.
REFERENCES:
patent: 1636363 (1927-07-01), Hettinger
patent: 1856580 (1932-05-01), Mitchell
patent: 2027299 (1936-01-01), Bohmer, Jr. et al.
patent: 2384672 (1945-09-01), Gleeson
patent: 3360273 (1967-12-01), Hundt et al.
patent: 4993722 (1991-02-01), Gundy
patent: 5275423 (1994-01-01), Allen et al.
patent: 5308090 (1994-05-01), Hamada et al.
patent: 5913522 (1999-06-01), Koch
Bacon & Thomas PLLC
Beres John L.
Brittain James R.
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