AU3875601A - Protective lining - Google Patents

Description

0 Reguai Patents Act 199o

ORIGINAL

COMPLETE

SPECIFICATION

STANDARD

PATENT

Inventio n T itle: PROTECTI VE LI N~ING The following staltemnent is a full description Of this invent ,i o in C.I.u d .i t he be .st Method Of performing it known to Me:-

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on 3.2 1 Field of the Invention THIS INVENTION relates to protective linings and, more specifically is concerned with a cheaply fabricated lining offering resistance to injury from violent abrasions and sharp objects which may impact with considerable velocity. In its simplest form the lining may be incorporated into a garment such as a jacket to protect the wearer from injury. An example of such a garment is a jacket or over-trousers of the kind worn by motor cyclists to protect themselves against injury from violent abrasions should they fall off the motorcycle when travelling at speed. The lining may also be made-up in multi-layer form and incorporated into body panelling of a vehicle such as a car, armoured van, aircraft or 10 helicopter to protect vital parts of the vehicle and its personnel against damage and injury from projectiles, such as bullets.

o99oo9 9o9 *State of the Art A requirement of a protective lining incorporated into a garment is that it should be light and flexible. This is also desirable when fitted behind a metal body panel of a vehicle as it 15 enables the lining to be fitted around parts of the panel which have an irregular surface 15 profile. Such flexibility avoids having to fabricate rigid solid linings of a specific shape in order to provide protection behind such a panel. The manufacture of solid inflexible linings, each unique to a specific panel shape, is costly even if the basic material from which the solid lining is formed is cheap.

20 Some plastics materials have been developed which can be manufactured as light and flexible loosely-woven sheets which offer a relatively high resistance in most cases to penetration by some projectiles. Such sheets are loosely woven with a conventional lattice pattern, from threads of about 1 1/2mm diameter and made from a material known under the Registered Trade Mark KEVLAR. In a lattice pattern of woven material, the weft and weave threads extend perpendicularly to one another.

A lining composed of several thin, flexible loosely-woven KEVLAR sheets is sometimes used in garments such as army flak jackets, police waistcoats and other applications where it is required to protect vital organs of the wearer against injury from low calibre hand-gun bullets. Unfortunately KEVLAR is an expensive material and this disadvantage is obviously reflected in the price of the garment.

I have discovered an adverse characteristics of loosely-woven KEVLAR sheets. It appears from ballistic experiments, that a lining composed of several superimposed sheets of loosely-woven KEVLAR degrades rapidly when subjected in rapid succession to impacts from successive rounds of ammunition from a hand-gun such as a 44 calibre magnum.

Object of the Invention An object of the invention is to provide a cheap yet relatively effective protective lining 10 The Invention In accordance with the present invention a protective flexible lining comprises one or more superimposed flat sheets made up from parallel strips of closely-woven non-lattice pattern webbing fabricated from a high-tenacity, continuous filament, synthetic plastics fibre material.

Advantages of the Invention Closely-woven, non-lattice pattern, webbing strips useable for constructing the linings of the invention, is cheaply and readily commercially available for numerous purposes where high tensile strength coupled with flexibility is required. Amongst such purposes may be mentioned flat synthetic-webbing used for slings used in the building industry and conforming to Australian Standard AS 1353.1-1997; webbing for restraining devices for occupants of motor vehicles and conforming to Australian Standard 1753-1990; and cargo restraint systems used for road vehicles in the transport industry and conforming to Australian and New Zealand Standards 4380: 1996; and 4475.2:-1997.

As examples of materials used to provide high tenacity fibres in the above-described webbing, may be mentioned: aramid polyamide; nylon; polyester; and ultra violet, lightstabilised polypropylene. Such webbing strips are commercially available at a cheap price in a wide range of webbing sizes each having its own characteristics as regards weight, thickness, width and tensile strength. Their common characteristic however, is that they 3 use a non-lattice tight weave, and are closely-woven with a thread diameter which is small compared with that used in lattice woven KEVLAR sheets.

Ballistic tests conducted by authorised ballistic testing organisations in Australia have shown that a lining composed of superimposed sheets of the invention offers a superior resistance to penetration by high-velocity projectiles for the same cost per unit area than KEVLAR sheeting. Although KEVLAR sheeting is lighter per unit area than the lining of the invention, this disadvantage is acceptable in many applications where cheapness and durability is a more important consideration than weight.

Preferred Features of the Invention loin the sheets of the invention it is preferred to stitch the webbing strips to one another on both sides and along both longitudinal edges. Ballistic tests have shown that, *.surprisingly, the resistance to penetration of the lining at the position of the stitching is not noticeably less than that offered by the unstitched areas of the lining.

When the lining is composed of a large number of sheets, these are preferably fabricated in separate panels each containing a number of superimposed sheets stitched together at their edges. The panels are then stacked one over the other to provide the lining with the required number of sheets, the sheets of contiguous layers preferably having the positions of the strips staggered with respect to one another.

When the lining is to be used to resist penetration from heavy calibre bullets, such as 44 Magnum ammunition, it is preferably formed from a synthetic plastics fibre material other than nylon. Also if a multi-layer lining capable of stopping a 44 magnum bullet is placed behind a 23mm steel door panel of a vehicle, the metal panel retards or blunts the tip of a 9mm metal jacketed bullet sufficiently for the lining to stop its motion altogether.

Introduction to the Drawings The invention will now be described in more detail, by way of examples, with reference to the accompanying drawings, in which: In the Drawing- FIGURE 1 illustrates a motor cycle-jacket, partly broken away, and reinforced with an internal lining; FIGURE2 illustrates a car having a metal door panel internally backed with a protective multi-layer lining; FIGURE 3 is a plan view of a diagrammatically illustrated sheet providing a protective lining for the jacket of figure 1, parts of the sheet being ringed and shown on a greatly enlarged scale; FIGURE4 is an end-view of the sheet of figure 3; o. 10 FIGURE5 is a plan view of four of the superimposed sheets of a protective lining o .used in the door of the vehicle of figure 2, the lining being partly broken away to expose internal detail and a ringed portion of one of the sheets being shown to an ooo enlarged scale; and, oooo 0% FIGURE 6 is a plan view of a part of a currently-used KEVLAR sheeting of looselywoven, lattice pattern where the weft and weave threads are of relatively large diameter (about 1 1/2mm) arranged perpendicularly to one another Description of First Embodiment Figure 1 is a garment in the form of a jacket 1 having inbuilt protection provided by a reinforcing lining 2 disposed between an outer water-resistant fabric covering 3 and an inner fabric layer 4. The lining 2 offers protection to the upper body of a rider of a motor cycle in the event of the rider being thrown off when travelling at speed.

Referring to figures 3 and 4 the lining 2 is made from a sheet composed of parallel strips of flat webbing made from closely-woven, high tenacity, continuous filament synthetic .plastics fibre stitched together edge-to-edge on both sides. The strips are not woven to a conventional lattice pattern. Instead, some or all of the threads are set diagonally, for example with a herring-bone weave, and the diameter of the threads is only one millimetre which is much less than the thread diameter in lattice pattern KEVLAR sheeting currently used in protection linings. The sheet 4 so formed is flexible, permeable to moisture, and is largely resistant to penetration by sharp objects which may impact on the sheet with considerable force at any angle of incidence in the event of an accident. The material used for the webbing strips is commercially available in Australia as thin black seat-belt webbing for use on motor vehicles and which is approximately 50 mm wide and 1 mm thick. It has a breaking strain of 5 tons. A 400 mm x 400 mm sheet of such webbing weighs approximately 2 kilograms.

Description of Second Embodiment The vehicle 10 shown in outline in figure 2 has a metal door panel 11 of 2 mm thick steel 10 internally provided with a lining 12 offering protection against penetration by low and medium calibre bullets from hand-guns. The lining 12 is flexible and is made up from ***superimposed sheets 9 of webbing strips stitched together edge-to-edge on both sides **of the sheet 9 as shown in figures 3 and 4. The lining 12 is made up from several superimposed stacks of overlapping sheets 9, each stack being stitched together at its edges As is apparent from Figure 5, the positions of the webbing strips 8 in neighbouring sheets 9 are staggered with respect to one another. The flexibility of the multi-layer lining 12 enables it to follow closely any irregular surface contour of the internal surface of the door panel 11. Flat truck webbing is used for the strips 8.

I have found that when flat, polyester, continuous-filament closely-woven blue truck 20 webbing commercially available in a width of 50 mm and a thickness of 1 mm, is used for the construction of the sheet, the lining required sixteen such sheets to stop a bullet from a 44 magnum hand-gun under ballistic test conditions. When red truck webbing, which has a slightly greater thickness is used, ten such sheets stop a 44 magnum bullet.

It appears that a greater number of sheets is necessary to stop a bullet of smaller size from a hand-gun if the bullet is metal jacketed. Thus when a lining composed of sheets of black, closely-woven, polyester seat belt webbing which is 50 mm wide and 1 mm thick is used for the sheet, the resultant lining required twenty-eight sheets to stop a 44 magnum bullet. However, thirty-four sheets were necessary to stop a 9 mm full-metal jacketed bullet from a pistol. The reason for this anomaly is not understood. From tests conducted on closely-woven non-lattice webbing made from different fibre materials, it appears that nylon is the least effective for stopping bullets of different calibres and type, as compared with webbing of the same dimensions made from different, cheaply-available, closely-woven plastics materials such as polyester, polypropylene or aramid polyamide. However, when the lining is mounted behind a 2mm thick steel sheet such as a car door panel the passage of a 9mm full-metal jacketed bullet through the panel retards and blunts the bullet sufficiently for it to be stopped by a lining made up from sufficient sheets to stop a 44 magnum bullet without an intervening steel door panel.

Examples of herring-bone closely woven, polyester webbing I have found useful for 10 carrying out the invention, are as follows: IYEE BREAKING STRENGTH WIDTH S* 2-SBW 80 1,800kg :2-SBW 25 1,000kg 2-SBW 50c 1,500kg 15 2-TW 50L 3,000kg 2-TW 50(red) 5,000kg S.2-TW 75 8,000kg (SBW seat belt webbing; TW truck webbing) a The following ballistic test results were obtained when test linings incorporating the invention were submitted to testing by independent testing companies licensed by the Australian government to perform such tests.

TESTA

In the following tabular presentation of test results the tests performed were in accordance with Australian Test Standard NIJ0101.03 and the tests were at level 3A. A stack of parallel sheets or piles each composed of parallel strips of seat-belt webbing stitched-together edge-to-edge as described above, constituted each of the four "panels" tested. The width of the strip in each case is given in millimetres.

Test Std: NIJ0101.03 Test Level: 3A Requirements: R D Size: 42x42cm Sample: Panel 1:32 piles 100mm wide narrow weave polyester seat belt belting Description: Panel 2:27 piles 50mm narrow weave polyester seat belt belting Panel 3:25 piles 50mm narrow weave polyester seat belt belting Panel 4:12 piles 50mm narrow weave polyester truck tie down belting TEST EQUIPMENT AND CONDITIONS Calibre: Bullet Type: Bullet Weight: 9 1. .44 1. LSWC GC 1. 2. 9mm 2. FMJ 2. L 3. 3. 3.

Velocity: (m/s Serial No: Barrel Length: mm 1. 438.5 7.5 1. TB44M128 1. 250 2. 433.5 7.5 2. TB919 2. 250 3. 3. 3.

Temp: 26 0 C Rel Humidity: 45% Range 5 m Panel Condition: Dry Backing Test: 1 24 mm 2. 24 mm 3.

24 mm

RESULTS

20 .Workmanship: Not applicable Labelling: Not applicable Comments: Shot 1 on panel 1 velocity 1m/s over limit Shot 1 on panel 3 velocity 2m/s over limit Statement of Compliance: Not required The ballistic results obtained from the tests were as follows: (Y=yes; N=no): BALLISTIC RESULTS Panel No: Cal Shot No: Angel (deg) Vel m/s Fair Hit Penet Deform 1 .44 1 0 442 N Y Not tested 0 2 .44 1 0 436 Y N 27 3 .44 1 0 443 N Y Not tested 2 9mm 2 0 438 Y Y Not tested 4 9mm 1 0 440 Y Y Not tested The reference to "deform" relates to a clay body placed behind the panel and is a measure of the amount of deformation it experienced as a result of the impact. A deformation of "27" is acceptable as it signifies a human body behind the panel will suffer physical injury but not be killed. A deformation value of "45" is necessary to denote killing.

The test showed that the second panel tested and composed of 27 superimposed sheets or piles will stop a 44 magnum bullet with acceptable injury to a person protected by the panel. Tests conducted on the 1st and 3rd panels should be disregarded as the test was not carried out with a "fair" hit. Likewise tests conducted on the 2nd and 4th panel using 10 a steel jacketed 9mm bullet showed penetration of the panel. Later tests corresponding @0 0_ to these but in which the panel was overlaid with a 2mm thick steel car door showed 0000e penetration of the panel with a 9mm steel jacketed bullet did not occur, possibly because the bullet was blunted sufficiently by its passage through the steel to be expanded and stopped within the thickness of the stack of sheets forming the panel.

TEST B In the test results the overlapping sheets of the panels being tested are referred to as .:layers". All the tests were carried out using a 9mm steel jacketed bullet.

*see Test Std: AS/NZ52343,97 Test Level: GO Requirements: R D Sample P1-34 layers 50mm polyester seat belt web (Yellow) Size: 42x42cm 0000 g Velocity: 405 (m/ls e 15Serial No: TB919 Barrel Length: 250 mm est ael eigt e Temp: 24 °C Rel Humidity: 55 Range: 3 m Temp: 26 °C Rel Humidity: 45% Range 5 m C:ayebrse llteet were carriedt using aM 9m te aktbullet.iht 0 Test Std: AS/52343,9 Test everil O 91 BRurem ent: R &D Sampe P13 laer 50m olyesdter sea bel we (elo) ie: 4242 m Temp: 26 0 C Rel Humidity: 45% Range 5 m Panel Condition: Dry Backing Test: 1 24 mm 2. 24 mm 3. 24 mm Panel Condition: Not weathered Weathering Details: City: State: Country: Start Date: Finish Date: Deviation from Standard: Not weathered Comments: Comments: Statement of compliance: Not required The ballistic results of the tests carried out were as follows: BALLISTIC RESULTS Panel No: Shot No: Angel (deg) Vel m/s Fair Hit Penet Witness Car Pass/Fail Perforation 1 1 0 394 Y Y Y F 1 2 0 408 Y Y Y F 1 3 0 417 Y Y Y F 1 4 0 411 Y Y Y F 2 1 0 417 Y Y Y F 3 1 0 415 Y Y Y F 2 0 418 Y Y Y F 1 0 415 Y N N P

V

V

V

V

V

V.

These tests show that, with the exception of the 5 th panel which had 22 layers of nylon extra heavy truck tie webbing, a steel jacketed bullet would penetrate the panel.

However, once again when tests were carried out with the panels covered by a 2mm steel plate simulating a car body sheet, the 9mm bullet was stopped within the thickness of the panel.

TESTC

In these tests, three panels of sheets (referred to as "layers") made of webbing strips as described beneath and stitched together edge-to-edge, were tested with a 44 magnum calibre bullet.

Test Std: AS/NZ52343,97 Test Level: G2 Re Sample P1-34 layers 50mm polyester seat belt web Description: P2-32 layers 50mm polyester truck tie web P3-20 layers 50mm polyester heavy truck tie web luirements: R D Size: 42x42cm TEST EQUIPMENT AND CONDITIONS Calibre: .44 Bullet Type: LSWC-GC Bullet Weight: 15.6 g Velocity: 480 (m/s 15 Serial No: TB44M128 Barrel Length: 250 mm Temp: 24 0 C Rel Humidity: 55 Range: 3 m Panel Condition: Not Weathering Details: City: Start Date: Finish Date: 0 0eo Deviation from Standard: Not weathered Comments: Comments: Statement of compliance: Not required The ballistic results of the tests were as follows: 0*

S

It will be observed that in all cases the panels withstood penetration by a 44 magnum bullet and the panels passed the tests.

Although the linings of the invention have been specifically described with reference to garments and vehicles it is noted that some houses in the United States now call for protection against bullets to be incorporated as linings to their doors etc. It is believed that the linings of the invention will meet this requirement.

Claims (6)

1. A protective flexible lining comprises one or more superimposed flat sheets made up from parallel strips of a closely woven, non-lattice, pattern webbing stitched together side-by-side and fabricated from a high-tenacity, continuous filament, synthetic plastics fibre material. A garment to be worn over the upper part of a person's body and incorporating a lining as claimed in claim 1.

3. A lining as claimed in claim 1, comprising a stack of overlapping sheets stitched together at their edges and for fitting inside the external body panels of a vehicle to goes resist injury or damage to its occupants or its operating parts.

4. A lining as claimed in claim 3, in which the strips of neighbouring sheets are staggered with respect to one another.

5. A lining as claimed in any one of claims 1-4, in which the material of the strips is polyester webbing.

6. A lining as claimed in claim 1, constructed substantially as described with S 15 reference to figures 3 and 4, or figure 5 of the accompanying drawings. so7. A garment as claimed in claim 2, constructed substantially as described with reference to figure 1 of the accompanying drawings.

8. A vehicle having one or more body panels provided with linings as claimed in claim 1 and substantially as described with reference to figures 2 and 5 of the accompanying drawings. Dated this 18th. Day of April 2001 JORDAN AEVSKI By:. (Applicant's Patent Atoey