Pipes and tubular conduits – Combined – With hose protector
Reexamination Certificate
2000-09-11
2001-09-11
Brinson, Patrick (Department: 3752)
Pipes and tubular conduits
Combined
With hose protector
C138S129000, C138S131000, C138S150000
Reexamination Certificate
active
06286557
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a sheath for at least partially covering a tubular member and, in particular, for covering a tubular member of the type commonly used in an underground mine.
BACKGROUND OF THE INVENTION
It is common in underground mines to provide mining machines with tubing for carrying hydraulic fluid or air. However, such tubing is subject to Australian Standards which specify, among other things, that the tubing should not exceed an average duration of flaming and glowing of thirty seconds (ie. should be flame retardant) and the electrical resistance of the tubing should not be greater than 1M&OHgr;/m.
SUMMARY OF THE INVENTION
The present invention seeks, among other things, to provide a sheath which, when combined with conventional tubing of the type used in an underground mine, provides a tube assembly which satisfies the above mentioned Australian Standards requirements.
In accordance with one aspect of the present invention there is provided a sheath for at least partially covering a tubular member, the sheath including a helically wound strip having an electrically conductive portion extending through the strip from an inner surface of the strip to an outer surface of the strip, the said conductive portion extending continuously substantially helically along at least part of the length of the sheath.
REFERENCES:
patent: 3299908 (1967-01-01), Petzetakis
patent: 3558754 (1971-01-01), Martin
patent: 3616123 (1971-10-01), Reynolds, Jr.
patent: 4587145 (1986-05-01), Kanao
patent: 4870535 (1989-09-01), Matsumoto
patent: 5862030 (1999-01-01), Watkins, Jr. et al.
patent: 31 45 702 A (1983-05-01), None
patent: 81 01227 (1981-04-01), None
patent: 0 252 338 A (1988-01-01), None
Brinson Patrick
Duane Morris & Heckscher LLP
Spiral Guard Australia Pty. Ltd.
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