US2011253657A1PendingUtilityA1

Roller Tube

44
Assignee: NG PHILIPPriority: Apr 15, 2010Filed: Apr 15, 2010Published: Oct 20, 2011
Est. expiryApr 15, 2030(~3.7 yrs left)· nominal 20-yr term from priority
Inventors:Philip Ng
E06B 9/50E06B 9/44
44
PatentIndex Score
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Cited by
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References
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Claims

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.

Claims

exact text as granted — not AI-modified
1 . A roller tube for rolling up a fabric blind, the roller tube comprising:
 an elongated tube having a length, an inner surface and an outer surface;   an elongated lip formed on the outer surface of the elongated roller tube and extending along the length of the elongated tube, the lip having a height substantially equal to a thickness of the fabric blind;   the outer surface having 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 having a circular profile;   a notch being formed on the inner surface of the elongated tube adjacent the lip, said notch extending along the length of the elongated tube.   
     
     
         2 . The roller tube as defined in  claim 1  wherein the notch and the lip are parallel. 
     
     
         3 . The roller tube as defined in  claim 1  wherein the tube has an axis and wherein the lip and groove are parallel to the axis. 
     
     
         4 . The roller tube as defined in  claim 1  wherein the notch is at least 1.7 mm from the lip.

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