AU598482B2 - Flexible ducting - Google Patents

Description

p984 8 2 FORM 10 SPRUSON FERGUSON COMMONWEALTH OF AUSTRALIA n~r~LI Aer 4n n~ LThis docurnent Contains th Lmlercjnletmcfe uncle DMPLETE SPECIFICATION Section 49 and is Correct for Printing.

(ORIGINAL)

63656166 Class Int. Class Application Number: Lodged: FOR OFFICE USE: PH-0778 28 May 1985 Accepted: Published: 0 4* 00 4 0* o c~o. 4 0 00 00) 00 4 04 0 0* Priori ty: Related Art: Name of Applicant: Address of Applicant: Actual Inventor: Address for Service: ALAN WALTER MCDOUGALL -1-3 Cartledge Avenue, -Mlranda7,--New South- Wales, 2228, Australia ALAN WALTER MCDOUGALL Spruson Ferguson, Patent Attorneys, Level 33 St Martins Tower, 31 Market Street, Sydney, New South Wales, 2000, Australia q I it Complete Specification for the invention entitled: LOO~isw SUB-0oFICE lz,%, rLe.AIDL UUUI±INU The following statement is a full description of this invention including the best method of performing it known to me pk/ 10014 The present invention relates to flexible ducting and more particularl- but not exclusively to flexible ducting as employed in air conditioning systems.

Flexible ducting, as employed in air conditioning systems, generallh consists of metal foil in tape form wound in a coil manner so as to form a tube, with the edges of the tape joined by a plastic rod assembly. These known constructions of ducting have now become expensive due to the cost of plastics material.

It is the object of the present invention to overcome or s',bstantially ameliorate the above disadvantage.

There is disclosed herein a flexible ducting consisting of a tape of flexible material wound in a coil so as to form a tube, with the edges of adjacent convolutions of the tape being joined by stitching, and wherein said ducting further includes a reinforcing rod wound in a coil manner to #9 follow the joins of the convolutions, wherein said reinforcing rod is ;I located on the exterior of said tubing, and is attached thereto by said stitching passing over said reiiforcing rod.

A preferred form of the present invention will now be described by way of example with reference to the accompanying drawings; wherein 20 Fig. 1 is a schematic side elevation of a length of air conditioning ducting; Fig. 2 is a schematic end elevation of the ducting of Fig. 1; Fig. 3 is a schematic side elevation of the ducting of Fig. 2 as sectioned along the line A-A.

2 25 In the accompanying there is schematically depicted a length of air conditioning ducting 10 which consists of a strip of metal foil, in ribbon form, wound in a helical manner about the axis 11 so as to form a tube.

More particularly, the tape 12 is wound so as to provide a plurality of convolutions 13 with the edges of adjacent convolutions being joined by stitching 14. The stitching 14 passes through overlapping portions 15 of the adjacent convolutions.

To reinforce the tubing formed by the tape 12 there is secured to the tape 12 along the joins of the convolutions a rod 16 which also accordingly would follow a coil path. The rod 16 may be of solid cross section or tubing. More particularly, the rod 16 would be joined to the convolutions 13 also by the stiching 14 by having the stitching 14 pass over the rod 16.

The rod 16 may be formed of metal, such as steel, or alternatively of plastics material. The tape 12 may be formed of foil, plastics material, cu-2paper, or textile.

In order to inhibit unravelling of the stitching 14, it may also be advantageous to apply over the stiching 14, a tape which adheres to the tape 12.

The above described tubing 10 is manufactured by feeding tape 12 to a sewing machine. The tape 12 is wound in a coil manner together with the rod 16 being held in place while the stitching 14 is applied thereto to secure the convolutions 13 together, together with the rod 16.

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Claims (3)

1. 2. A flexible ducting of claim 1 wherein a first edge of each S"0.'Q convolution abut the previous convolution so as to be located on the i exterior thereof, while the other edge of the convolution is located abutting the interior surface of the other adjacent convolution.
2. 3. The ducting of claim 1 or 2 wherein said tape is formed of foil, 0 0 plstics material, paper or textile, and said reinforcing rod is formed of 0 oi a metal, such as steel, or a plastic material.
3. 4. A flexible ducting, substantially as hereinbefore described with reference to the accompanying drawings. .00 o DAED this TWENTY NINTH day of MARCH 1990 Cynklina Pty Limited Patent Attorneys for the Applicant S' SPRUSON FERGUSON 4 -4-