Roller Tube

a technology of roller tubes and rollers, applied in the field of roller tubes, can solve the problems of blinds not being properly wound onto roller tubes, fabric does not maintain a circular cross sectional profile, and the assembly of roller blinds takes a surprising long tim

Inactive Publication Date: 2011-10-20
NG PHILIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]In accordance with one aspect of the present invention, there is provided an improved roller tube for rolling up a fabric blind which overcomes the drawbacks of the prior art. In particular, a rolle tube made in accordance with the present invention includes 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 roller tube and extends along the length of the elongated tube. The lip has a height substantially eq

Problems solved by technology

Since one end of the blind is attached to the roller tube by a length of adhesive tape, and since the roller tube has a circular cross sectional profile, the fabric does not maintain a circular cross sectional profile as it is wound onto the tube.
Assembling a roller tube by attaching one end of the fabric blind to the tube is time consuming because the end of the fabric must be maintained perfectly parallel to the axis of the roller tube, otherwise the blind cannot be properly wound onto the roller tube.
Therefore, assembling a roller blind takes a surprisingly long time.

Method used

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Examples

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Embodiment Construction

[0011]Referring to FIGS. 1 and 2, a roller tube made in accordance with the present invention is shown generally as item 10 and includes an elongated roughly cylindrical tube 12 having an outer surface 14 and an inner surface 16. Tube 12 preferably consists of an extruded aluminum tube. Lip 18 is formed on outer surface 14 of tube 12 and notch 20 is formed on inner surface 16 adjacent lip 18. Lip 18 has a wall 28 with an upper rim 26. Wall 28 has a height 30 which is selected to be substantially equal to the thickness of fabric blind 24. Lip 18 is exactly parallel to central axis 22 of roller tube 10.

[0012]Roller tube 10 has a cross sectional profile which is not perfectly circular. In particular, roller tube 10 has an external diameter which is different depending on where the diameter is measured, due to the height of wall 28 of lip 18. The external diameter of tube 10 taken at lip 18, which is indicated by dotted line 32 is slightly greater than the external diameter of tube 10 t...

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PUM

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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.

Description

FIELD OF THE INVENTION[0001]The invention relates generally to roller tubes as used in roller blinds to roll up a fabric blind.BACKGROUND OF THE INVENTION[0002]Roller blinds generally consist of a fabric blind which is rolled onto an elongated cylindrical roller tube. The roller tube is coupled to some sort of clutch mechanism which operates to rotate the roller tube about its axis in order to roll up or roll down the fabric blind mounted to the roller tube. The fabric blind has one end affixed to the roller tube, usually by a length of adhesive tape. As the roller tube is rotated, the fabric blind is wound (i.e. rolled up) onto the roller tube. Since one end of the blind is attached to the roller tube by a length of adhesive tape, and since the roller tube has a circular cross sectional profile, the fabric does not maintain a circular cross sectional profile as it is wound onto the tube. Rather, it is more accurate to say that the fabric is oriented in a spiral fashion onto the rol...

Claims

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Application Information

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IPC IPC(8): A47H1/18
CPCE06B9/50E06B9/44
InventorNG, PHILIP
OwnerNG PHILIP