Reinforced flexible tubing and method of making same
AssigneeCrushproof Tubing Company
InventorVance M. Kramer, Jr.
Life of this patent
Estimating the term…
Abstract
A method for making helically corrugated rubber tubing with a helical reinforcing element secured therein. A helical spring like element with axially spaced convolutions is slid onto a mandrel and a sleeve formed of uncured rubber is slid over the spring like element. The mandrel is then rotated about its axis and a flexible cord is wrapped around the sleeve to press portions of the sleeve into the spaces between adjacent convolutions of the spring like element and form helical corrugations. The resulting assembly is then placed in an oven to cure the rubber sleeve after which the cord is removed. The finished product is then removed from the mandrel.
Claims10
A method for making a length of flexible, helically corrugated rubber tubing with a helical reinforcing element secured therein, comprising the steps of:
- sliding a helical spring like reinforcing element with spaced helical convolutions axially over a cording mandrel;
- sliding an uncured rubber sleeve axially over said helical reinforcing element;
- rotating said cording mandrel, said reinforcing element and said uncured rubber sleeve about the axis of said mandrel while wrapping a cord about the sleeve to press portions of said sleeve into the spaces between adjacent convolutions of said reinforcing element to form a tubular assembly;
- heating said tubular assembly to cure said sleeve;
- unwrapping and removing the cord from the cured sleeve;
- and
- sliding the resulting reinforced length of rubber tubing axially from the curing mandrel.
Dependencies are inferred from the claim text.