Pipe joints or couplings – Deformed
Reexamination Certificate
2001-12-18
2004-07-27
Nicholson, Eric K. (Department: 3679)
Pipe joints or couplings
Deformed
C285S915000, C285S405000
Reexamination Certificate
active
06767036
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to the field of gas-tight housings for protective devices and systems for electrical power transmission and distribution systems, and more particularly to a method and arrangement for providing a gas-tight joint between two housing portions, e.g. between an end flange and a tubular pole-unit housing for a circuit interrupter or an insulating support column.
2. Description of the Related Art
Various methods are know for providing a gas-tight joint between a flange/end fitting and a tubular housing, e.g. especially for arrangements involving the end closures of gas-tight enclosures. One method utilizes a heat-shrink process whereby a metallic end flange is heated and assembled onto a tubular housing to which adhesive has been applied. Another method utilizes a flange having internal grooves that is assembled onto a tubular housing.
While the prior art arrangements may be useful to provide housing joints, these prior arrangements do not provide a desirable interference fit and the advantage of a grooved assembly.
SUMMARY OF THE INVENTION
Accordingly, it is a principal object of the present invention to provide a gas-tight joint between a housing and an end flange.
These and other objects of the present invention are efficiently achieved by the provision of a method and arrangement for providing a gas-tight joint between two housing portions, e.g. between an end flange and a tubular pole-unit housing for a circuit interrupter or an insulating support column. The joint is formed via a heat-shrink process to provide an interference fit. The housing is provided with grooves to retain adhesive during the assembly process.
REFERENCES:
patent: 3784235 (1974-01-01), Kessler et al.
patent: 3826025 (1974-07-01), Elliott
patent: 3859704 (1975-01-01), Nasson
patent: 5116172 (1992-05-01), Koster
patent: 5516117 (1996-05-01), Rangel
patent: 5803553 (1998-09-01), Wei
patent: 5921591 (1999-07-01), Argent
patent: 6050612 (2000-04-01), Wolterman
Barker, Jr. James W.
Maroney Michael R.
Lapacek James V.
Nicholson Eric K.
S&C Electric Co.
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