Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1996-06-24
1998-02-10
Melius, Terry Lee
Pipe joints or couplings
Nonmetal to metal
Internal member
285354, 285379, 285238, F16L 3318
Patent
active
057160791
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates generally to a hose assembly and specifically to connection elements used within a hose assembly having a seal therebetween.
In hose assemblies, it is common to employ a male and female hose subassembly each having threaded connection portions and a seal therebetween. Many such conventional male hose subassemblies have a male ferrule, partially extending within a first tubular member, and an outer casing which traps the tubular member therebetween. Similarly, conventional female hose subassemblies have a female ferrule, which partially extends within a second tubular member, and a congruent outer casing. The female hose subassemblies also have provisions for an internally threaded nut which operably secures an externally threaded portion of the male ferrule to the female hose subassemblies. Traditionally, a flat washer-type annular seal is juxtaposed between an end of the male ferrule and a simple outwardly formed radial flange of the female ferrule. Such a construction is shown in the "Bartholomew Manual on Tubing, Piping and Connector Systems", page 8 (1992), which was authored by the inventor of the present invention and is incorporated by reference herewithin. This washer-style seal, in combination with the aforementioned traditional ferrule configurations, is known as a compression seal.
Typically a compression seal is allowed to distort and radially move under load since only a pair of walls, the radial flange of the female ferrule and the adjacent end of the male ferrule, act to retard movement of the seal. Over time such a compression seal typically takes a permanent set due to cold flow of the elastomeric material and subsequent breakage of the polymeric molecular chains after continuous tightening together of the male and female hose subassemblies. Thus, when compression seals are subjected to extended use and over-torquing, their sealing ability tends to significantly degrade.
SUMMARY OF THE INVENTION
In accordance with the present invention, the preferred embodiment of a new and useful hose assembly having a distortion limiting wall for creating a dynamic seal comprises a seal, a male hose subassembly and a female hose subassembly. The male hose subassembly has a first tubular member with a first outer casing externally surrounding a distal end thereof. The male hose subassembly further has a male ferrule with an insertion portion protruding partially therein concentric and congruent with the first outer casing such that the first tubular member is securely trapped therebetween. The male ferrule also has an externally threaded male connection portion juxtaposed external to the first tubular member. The connection portion of the male ferrule is substantially parallel with an axial centerline of the first tubular member and has a lip which projects therefrom.
Additionally, the female hose subassembly provides a second tubular member having a second outer casing externally surrounding a distal end thereof with a female ferrule partially projecting internally therein concentric and congruent with the second outer casing. Thus, the second tubular member is trapped between the second outer casing and the female ferrule. The female ferrule is defined by an insertion segment projecting within the second tubular member and a flanged segment radially projecting outward therefrom juxtaposed adjacent to the distal end of the second tubular member. Furthermore, the female ferrule has a substantially cylindrical extension segment projecting from a circumferential edge of the radially flanged segment such that the extension segment is substantially parallel with an axial centerline of the female hose subassembly. The extension segment acts as an additional seal distortion limiting wall. Moreover, the female ferrule also has an inwardly angled segment projecting from an end of the extension segment opposite from the radially flanged segment. An internally threaded nut is rotatably mounted around the female hose subassembly and provides a secure connection
REFERENCES:
patent: 683342 (1901-09-01), Sherman
patent: 1138946 (1915-05-01), Elliott
patent: 1160944 (1915-11-01), Muller
patent: 1936552 (1933-11-01), Goss
patent: 2458817 (1949-01-01), Wolfram
patent: 3396995 (1968-08-01), Burnside
patent: 4030778 (1977-06-01), Kaut, Jr.
Melius Terry Lee
Proprietary Technology, Inc.
Shackelford Heather
LandOfFree
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