Pipes and tubular conduits – Flexible – Corrugated
Patent
1995-02-24
2000-08-15
Brinson, Patrick
Pipes and tubular conduits
Flexible
Corrugated
138121, 138177, 264507, 264508, F16L 1100, B29D 2318
Patent
active
061020788
ABSTRACT:
A process for making a length of rubber tubing with axially spaced circumferentially corrugated flexible segments from a sleeve of uncured rubber and the product resulting therefrom. An end length of a sleeve of uncured rubber is placed over an end portion of a forming mandrel and an external form is placed around the sleeve end length. Rudimentary corrugations are then formed in the end length after which the sleeve is moved axially along the forming mandrel so that a new length portion of the sleeve is placed in a forming position. Then using the external form, rudimentary corrugations are formed in the second length portion of the sleeve. These steps are repeated until the desired number of axial length portions in the sleeve are provided with rudimentary corrugations. The resulting product is then cured to form a length of rubber tubing with a plurality of axially spaced circumferentially corrugated flexible segments.
REFERENCES:
patent: 2622623 (1952-12-01), Michaudet
patent: 2779976 (1957-02-01), Roberts et al.
patent: 3304581 (1967-02-01), Kramer et al.
patent: 3714311 (1973-01-01), Stefanka
patent: 3838713 (1974-10-01), Tubbs
patent: 3847184 (1974-11-01), God
patent: 4534923 (1985-08-01), Lupke
patent: 5311753 (1994-05-01), Kanao
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