Buckles – buttons – clasps – etc. – Clasp – clip – support-clamp – or required component thereof – Dissociable gripping members
Patent
1992-10-16
1995-01-31
Brittain, James R.
Buckles, buttons, clasps, etc.
Clasp, clip, support-clamp, or required component thereof
Dissociable gripping members
160395, E06B 9171
Patent
active
053849418
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention refers to a canvas-blind tube comprising a cold-rolled profile tube whose outer surface has formed therein at least one recess, which extends in the longitudinal direction of the profile tube and which is defined by the wall of said profile tube, the end of a length of canvas-blind material and at least one rod for fastening said length of canvas-blind material being adapted to be inserted into said recess.
Such a canvas-blind tube is known e.g. from FR-A-23 65 013. The cold-rolled profile tube is provided with a dovetailed groove, which is formed in said profile tube and which has inserted therein a trapezoidal holding rod. It is no longer necessary to sew up the rod in the canvas-blind material because said material can be clamped in position between the holding rod and the groove. It is, however, necessary that the rod is inserted in the axial direction of the profile tube, and this will normally require a complete removal of the canvas-blind tube, when a worn length of canvas-blind material has to be exchanged, since the lateral space available for inserting the rod will not suffice in most cases.
German-pat. 302 101 shows a curtain rod with triangularly arranged grooves in which the curtain material can be clamped in position by means of strips. In order to prevent these strips from falling out, triangular end pieces are inserted into the ends. It is thus, in principle, possible that the strips together with the curtain material are inserted radially into the curtain rod from outside, but, subsequently, separate parts; viz. said end pieces, have to be inserted axially.
Hence, the present invention is based on the task of improving a canvas-blind tube of the type mentioned at the beginning in such a way that the length of canvas-blind material can be installed more easily.
In accordance with the present invention, this task is solved by the features that, for forming an essentially tangentially extending first recess, the wall of the profile tube is first folded inwards onto itself and is then bent back in an L-shape, the long L-leg portion extending in parallel spaced relationship with the double-folded wall and the shorter L-leg portion extending towards the outer surface of the profile tube and delimiting the opening of said first recess, and that, for forming an essentially radially extending second recess, the wall following said shorter L-leg portion is bent inwards in a U-shape, one of the two legs of said U-shape extending parallel to the shorter L-leg portion, whereas the other leg extends in spaced relationship therewith and merges at its free end with the cylindrical portion of the tube wall, said rod being constructed as a strip of plastic material comprising a tongue extending into said first recess and a foot section following said tongue and extending into the second recess.
This solution permits the rod to be inserted first tangentially and then radially into the recess of the profile tube after having put the length of canvas-blind material round the tongue extending into the first recess. Sewing up of the strip of plastic material in the end of the length of canvas-blind material is not necessary, and also an axial insertion of the strip is superfluous. Nor is it necessary to use any additional holding means for the strip. This canvas-blind tube is advantageous not only insofar as the length of canvas-blind material can be attached to the profile tube more easily but also insofar as it is much less difficult to provide the length of canvas-blind material in an aligned position, since the insertion of the strip of plastic material will no longer cause any displacements of the length of canvas-blind material. An additional advantage of this structural design is to be seen in the fact that it will suffice when the two recesses extend radially into the interior of the tube much less far than in the case of the structural designs according to the prior art. Hence, more space for the drive motor will be available in the interior of the profile tube. The to
REFERENCES:
patent: 4467504 (1984-08-01), Quist
Brittain James R.
Josef Welser oHG et al.
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