Metal working – Method of mechanical manufacture – Gas and water specific plumbing component making
Reexamination Certificate
2002-02-01
2003-07-22
Vidovich, Gregory (Department: 3726)
Metal working
Method of mechanical manufacture
Gas and water specific plumbing component making
C029S890145, C029S890147, C029S558000
Reexamination Certificate
active
06594900
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method, and more particularly to a method for integrally forming a pipe connector of a gas isolated switchgear (G.I.S.)
2. Description of Related Art
With reference to
FIGS. 9 and 10
, a conventional pipe connector for a gas isolated switchgear (G.I.S.) in accordance with the prior art is composed of two flanges (
30
,
32
) and a tube (
34
). The flanges (
30
,
32
) and the tube (
34
) are made of aluminum alloy. The flanges (
30
,
32
) are respectively secured to two ends of the tube (
34
) by a welding process. After a heat treatment process and final working, the pipe connector can be used in a gas isolated switchgear.
However, the conventional method for manufacturing a pipe connector for a gas isolated switchgear involves the following shortcomings:
1. Because the pipe connector made by the conventional method is composed of three parts assembled by the welding process, there is the possibility gaps being defined between the parts due to errors in the welding process. These gaps will be of great significance because they may cause explosion or the release of the internal stress between two different welded parts. In addition, the structural strength of the combined pipe connector is not enough to withstand long term use.
2. The flanges (
30
,
32
) of the pipe connector are manufactured by a casting process. The tube (
34
) is formed with a plate being curled and being then welded, or formed by an extrusion process. Then, a further process, i.e. the welding process, is required to assemble the flanges (
30
,
32
) and the tube together (
34
). Consequently, the numerous processes for manufacturing a pipe connector for G.I.S. by the conventional method result in high labor costs and increase the chances of defective quality products. However, there is no scope for reducing costs in the manufacturing of the pipe connector by the conventional method.
3. To avoid explosion or leakage, several tests, including light test, pressing test and seal test and so on, must be carried out after the pipe connector has been manufactured. These tests further increase the already-high cost of the conventional connector. To overcome the shortcomings, the present invention tends to provide a method for integrally forming a pipe connector to mitigate or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a method for manufacturing a pipe connector for a gas isolated switchgear and that can simplify the processes and provide an economic cost for manufacturing the pipe connector.
REFERENCES:
patent: 1872357 (1932-08-01), Straty
patent: 2309666 (1943-01-01), Parker
patent: 3672197 (1972-06-01), Popov et al.
patent: 3740813 (1973-06-01), Moore
patent: 3812700 (1974-05-01), Horton
patent: 3953247 (1976-04-01), Elhaus et al.
patent: 4674171 (1987-06-01), DeCell et al.
patent: 4768369 (1988-09-01), Johnson et al.
patent: 5906047 (1999-05-01), Miller et al.
patent: 6145185 (2000-11-01), Hwang
Kamrath Alan D.
Nguyen T.
Rider Bennett LLP.
Vidovich Gregory
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