Roller Tube

Abstract

The present invention is a roller tube for rolling up a fabric blind. The roller tube consists of an elongated tube having a length, an inner surface and an outer surface. An elongated lip is formed on the outer surface of the elongated tube and extends along the entire length of the elongated tube. The lip has a height substantially equal to the thickness of the fabric blind which is to be wound onto the roller tube. The outer surface of the elongated tube has a first cross sectional diameter at the lip and a second cross sectional diameter at an angle from the first cross sectional diameter, the first cross sectional diameter being larger than the second cross sectional diameter by the height. The inner surface of the elongated tube has a circular profile. A notch is formed on the inner surface of the elongated tube adjacent the lip, said notch extending along the length of the elongated tube. The notch and lip are parallel to the axis of the roller tube.

Dependencies are inferred from the claim text.