AU628398B2 - Improved woven webbing for lifting slings - Google Patents

Description

To: The Commissioner of Patents Fee: $65.00 Our Ref: PI S:AM 54MOXHAM I: i i l

-I

COMPLETE SPECIFICATION FOR OFFICE USE Application Number: Lodged: Class Tnt. Class Complete Specification Lodged: Accepted: Published: Priority: 6 L9,: 0 o 0 o9 °o a« 90 Q 0 00 9 9 o o 0 00 9 000 Related Art: TO BE COMPLETED BY APPLICANT Name of Applicant: Address of Applicant: Address for Service: MOXHAM INDUSTRIAL PTY. LTD.

4 Park Drive, South Dandenong, Victoria, 3175.

SMITH SHELSTON BEADLE 207 Riversdale Road Box 410) Hawthorn, 3122, Victoria, Australia 0 *o 0 0 0 *0 oe 0o o Complete Specification for the invention entitled: IMPROVED WOVEN WEBBING FOR LIFTING SLINGS The following statement is a full r' scription of this invention, the best method of performing it kr.:-n to me/us: including Page 1 Our Ref: #1560 PS:LG g32 ^O® ^Q\^0t i 1 2 3 4 6 7 8 9 11 12 13 14 16 17 18 19 21 22 23 24 26 27 28 -A /t'j z ,QS i 2 This invention relates to fabric woven webbing and more particularly to an improved fabric woven flat webbing of the kind used in lifting slings and the like.

Lifting slings, because of the nature of their use require regular inspections and sometimes retesting to ensure they are in a safe and servicable condition. This usually involves having a qualified inspector visit the location at which the sling is being used whereby the sling may be inspected whilst in service or returning the sling to a manufacturer or r e c o g n i z e d testing authority for inspection and/or testing. In either case the costs involved each time are not insignificant. Furthermore, it is often difficult to assess the exact condition of a lifting sling by a visual inspection and a wrong assessment can have serious consequences if it results in an unsafe sling remaining in service.

It has long since become evident that a great many slings suffer major wear first on the edges, thus weakening the product and reducing its overall strength and leading to a more rapid deterioration of the sling body thereby prematurely reducing the effective life of the sling.

Damage on the edges is far more detrimental than damage on the body of the sling.

Accordingly, it is an object of tnis invention to provide an improved woven webbing which overcomes or reduces the aforementioned problems of known webbing.

The invention therefore provides an elongate woven webbing for lifting slings and the like, said webbing having I. -A n1o -11 -3a main body woven from a first yarn and edge portions including a second yarn which is woven along the edges thereof to provide higher abrasion resistance along said edges.

In order that the invention may be more readily understood reference should be made to the attached drawings which show in more detail one particular embodiment of the invention and wherein; Figure 1 is a loom pattern diagram and, Figure 2 is a schematic cross-section of a webbing material manufactured according to the loom pattern of Figure i.

The webbing is manufactured on a narrow fabric needle or bobbin loom and is constructed in double ply design although in alternative embodiments single, triple or quadruple ply designs could be utilized.

Persons skilled in the art will readily understand the construction of the webbing from the product specification :0.0 hereinbelow and the loom pattern diagram of Figure 1, and further discussions thereof is unnecessary.

S 20 Referring to the drawings and particularly Figure 2, 200 .Polyester Monofilament threads 10 extend along each side of the webbing and are retained by weft yarn 11 forming top and bottom fabric of the webbing. As is evident from the product specification the warp threads 10 which constitute high S 25 abrasion resistant threads are formed of 250 Denier Dope Dyed Black Polyester Monofilament yarn. The weft yarn 11 is 2200 a Decitex twisted (S60) Polyester and is natural in colour. The weft yarn is interwoven with a series of top and bottom warp yarns 12 and 13, respectively which comprise 4400 Decitex Polyester in each case.

In addition stuffer warp threads 14 extend in the central plane of the webbing and are formed of 9900 Decitex Polyester yarn and three cutter warp threads 15 bind together top and bottom layers of the fabric. The cutter warp threads 15 are formed of 2200 Decitex (S60) Polyester yarn, the same as the weft yarn 11.

A binder thread 16 and a lock thread 17 extend along one side edge of the webbirg and are formed of 1100 Decitex Dope ~Dyed Black Polyester (binder thread) and 550 Decitex Dope Dyed ~_l__pr~p -4- Black Polyester (lock thread). The lock and binder threads 16 and 17 are knitted to the weft yarn 11. All threads except the 250 Denier Black Dope Dyed Monofilament Polyester and the binder and lock threads are natural in colour.

The following yarn key should be viewed in conjunction with the loom pattern diagram of Figure 1, as the key indicates the vari,-us threads in the loom pattern.

YARN KEY .0 KEY MATERIAL S250 Denier Black Polyester Monofilament W 4400 Decitex (S60) Polyester S 9900 Decitex (S60) Polyester S 2200 Decitex (S60) Polyester M 1100 Decitex Dope Dyed Black Polyester E 550 Decitex Dope Dyed Black Polyester 4o i 4i 4 II a 4r 44 a, 4 5 1 Whilst a specific embodiment has been disclosed it will 2 be readily apparent to persons skilled in the art that 3 modifications may be readily made. For example, the high 4 abrasion resistant threads may be formed of a hard wearing nylon filament such as Cordura manufactured by 6 Du Pont. Also the weave pattern may be varied considerably 7 and furthermore, as mentioned above, may be of various 8 different ply designs. The materials used in the main body 9 may also take many different forms depending upon the type of weave structure, the intended tensile strength of the 11 webbing and the intended use, amongst other things. Whilst 12 polyester or polyamide materials may be used the derivatives 13 of these materials as well as other different materials may 14 be used. The main requirements of course are that the edges of the webbing have a stronger and preferably differently 16 coloured construction to the remainder of the webbing. The S 17 edge yarn forms a semi-circular curved portion around the S18 edges of the webbing.

19 It should be evident that the present invention provides an improved webbing material suitable for use in 21 lifting slings. The wear resistant edges increase the 22 safety and life of a lifting sling constructed therefrom 23 without significant increase to the cost of the sling.

24 Various different colour combinations between the coloured edges and the main body of the webbing may be used to 26 designate various different load capacities of the webbing.

27 28 R Q1 r)12 1) 1 L ni,

Claims (8)

1. An elongate woven webbing for lifting slings and the like, said webbing having a main body woven from a first yarn and edge portions including a second yarn which is woven along the edges thereof to provide higher abrasion resistance along said edges.

2. A webbing according to claim 1 wherein said second yarn is of contrasting colour to said first yarn.

3. A webbing according to claim 1 or 2 wherein said second yarn is Polyester Monofilament or Polyamide yarn.

4. A webbing according to claim 1 or 2 wherein said second yarn is hardwearing Nylon filament.

A webbing according to any one of the preceding claims wherein said second yarn forms a semi-circular cover over the edges of said webbing when viewed in section.

6. A webbing according to claim 5 wherein said second yarn includes a binder thread and a lock thread extending along one o said edge, said binder and lock threads being thinner than the remainder of said second yarn and being knitted to the weft 20 portion of said main body.

7. A webbing according to claim 6 wherein said first yarn is S* high tenacity Polyester or Polyamide yarn.

8. An elongate woven webbing substantially as hereinbefore described with reference to the accompanying drawings. so DATED: 1 June 1992 CARTER SMITH BEADLE Patent Attorneys for the Applicant: MOXHAM INDUSTRIAL PTY LTD