AU2006100585B4 - A security fencing system - Google Patents

Description

AUSTRALIA

PATENTS ACT 1990 COMPLETE SPECIFICATION FOR AN INNOVATION PATENT

ORIGINAL

Name of Applicant: Actual Inventor: Greg Wheeler Contracting Pty Ltd Greg Wheeler Address for Service is: SHELSTON IP Margaret Street SYDNEY NSW 2000 CCN: 3710000352 Telephone No: Facsimile No.

(02) 9777 1111 (02) 9241 4666 Attorney Code: SW Invention Title: A SECURITY FENCING SYSTEM Claiming Priority From: Australian Provisional Patent Application No. 2006900849 The following statement is a full description of this innovation, including the best method of performing it known to us: File: 48990AUV00: 23. Feb. 2007 8:33 Sheiston IP No. 312 P. 4 o -2- FIELD OF TUE INNOVATION The present innovation relates to a corrugated fence pale, a scuring member for a fence pale, and various systems and methods related to security fencing.

The innovation has been primarily developed for reducing the risk of s unauthorised access to enclosed areas by the removal of fence pales, and wil Ibe described herein by reference to that application. However, it will be appreciated that o the innovation is by no means limited to this filed of use, and is generally applicable in a INO broader context.

0 BACKGROUND TO THE INNOVATION 1a Any discussion df the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of common general knowledge in the field.

Corrugated fence pales are commonplace in the context of security fencing systems. In such systems, a fence support structure is erected and secured iD the ground, the structure having a horizontal support member. Corrugated pales are secuely attached at laterally spaced locations on the support member, typically by w y of bolts.

Corrugated pales are regarded as particularly well suited to high securty applications given longitudinal rigidity properties provided by a corrugated design. For example: a single bolt at an upper region often secures such pales, and the corrugated 2o design substantially prevents a lower portion being upwardly bent to gain acces to a fenced area.

Known security fencing systems that make use of corrugated palesme nevertheless, subject to damage as a result of malicious tampering. The presant innovator has identified a particular quality of known corrugated fence pales that presents a particular security risk. This security risk renders many known corrugated pales subject to being easily removable following strong or repeated impact at or around a securing bolt.

SUMMVARY OF THE INNOVATION It is an object of the present innovation to overcome or ameliorate at east one of the disadvantages of the prior art, or to provide a useful alternative.

COMS ID No: SBMI-08359397 Received by II' Australia: Time 09:48 Date 2007-02 23 00 0 0 0 0 ciq 23. Feb. 2007 8:33 Shelston IP No.1 -3- In accordance with a first aspect of the innovation, there is provided corrugated fence pale for securely attaching to a lateral prismatic support mc fence pale including: a pair of laterally spaced longitudinally extending corrugated portion s a longitudinally extending central web integrally laterally connecting corrugated portions, the web having a substantially planar inner web surface conforming abutting engagement with a corresponding planar surface on the member.

Preferably the corrugated portions extend along substantially parallel 10 longitudinal axes.

Preferably the tae includes a mouhting apeiture formed through the for receiving a securing member engageable with the web portion and the su member. More preferably, upon secure attachment the securing member abi engages with an outer web surface of the web portion. Still more preferably is web surface is substantially planar. Preferably upon secure attachment the o surface is resiliently outwardly biased. Preferably the support member inclu formation for receiving the support member.

Preferably in absence of secure attachment the corrugated portions c< between an outer lateral'datum and an inner lateral datum spaced apart from lateral datum. More prefembly the web is located intermediate the inner late and the outer lateral datum such that upon the secure attachment the respecti edges of the corrugated portions are tensionally engaged with the correspond of the support member. Preferably the separation dimension of the inner we from the inner lateral datum is less than about 10% of the separation of the ix datum from the outer lateral datum. More preferably the pale is constructed having a substantially constant thickness dimension defined by the separatiol inner web surface from the outer web surface, and the separation dimension inner surface from the inner lateral datum is less than the thickness dimensio embodiments the separation dimension of the planar inner surface from the ii datum is less than about 50 of the thickness dimension.

Preferably each corrugated portion includes a pair of substantially pie portions converging toward and connected by a central curved portion.

m elongate tuber, the i; and the for close support 312 P. web portion )Port -tingly the outer fter web les a rrugate [he outer a datum re outer ing surface surface ner lateral )f s teel iof the f the planar 1. In some iner lateral nat arm COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 200 7 02

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2 3 23. Feb. 2007 8:33 Shelston IP No. 1312 P. 6 o 4.- 0 Preferably the inner web surface has a lateral dimension of at least 1% of the C) total lateral dimension of the pale.

Cfl According to a second aspect of the innovation, there is provided as eurity fencing system including: an elongate corrugated fence pale for secure attachment to a lateral p ismatic 00 support member according to the preceding aspect; and oa mounting member for securely attaching the pale to the prismatic support member, the mounting member including: oa shank insertable through a mounting aperture in the web; and a head integrally formed with the shank portion and being geometric aly configured to substantially reduce the risk upon secure attachment of general ly downward impact on head the separating the headwith respect to the shank.

Preferably the head is substantially defined by a dome having a pair of opposite minor segments removed along substantially parallel chords. More preferab y the head is substantially defined by a dome having four minor segments removed to define a substantially rectangular base periphery. In a preferred embodiment the do ie has a central flattened uppermost region defining a planar top having a circular per phery.

In a-preferred embodiment the head includes: a.substafitially planar inner surface for abutting engagement with an uter surface of the web updn secure attachment; and an outer surface substantially opposite the first surface having oppos te edges respectively converging toward respective corresponding edges on the inner surface.

Preferably the opposite edges on the outer surface respectively meet, he corresponding edges on the inner surface. More preferably the opposite edges on the outer surface are respectively spaced by less than about 3mm.

According to a further aspect of the innovation there is provided a m unting member for securely attaching a corrugated fence pale according to the first aspect to a prismatic support member, the mounting member including: a shank insertable through a mounting aperture in the web; and COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02.23 23. Feb. 2007 8:34 Shelston IP No 13 12 P. 7 a head integrally formed with the shank portion and being geometric configured to substantially reduce the risk upon secure attachment of genera downward impact on head the separating the head with respect to the shank.

According to a further aspect of the innovation, there is provided a s( s fencing system including: an elongate corrugated fence pale for securely attaching to a lateral p support member, the fence pale including: a pair of laterally spaced longitudinally extending corrugated and 0 a longitudinally extending central web integrally laterally cor corrugated portions, the web having a substantially planar inner web surface conforming abutting engagement with a corresponding planar surface on the member, wherein in absence of secure attachment the corrugated portions cc between an outer lateral datum and an inner lateral datum spaced apart from is lateral datum, the web being located intermediate the inner lateral datum anc lateral datum such that upon the secure attachment the respective outer edge corrugated portions are tensionally engaged with the corresponding surface i support member; and a mounting member for securely attaching the pale to the prismatic s member, the mounting member including: a stainless steel shank insertable through a mounting aperture and a head integrally formed with the shank portion, the head being subsi defined by a dome having four minor segments removed to define a substani rectangular base periphery and thereby to provide a deflection rated curvatum purchase area for substantially reducing the risk upon secure attachment of j downward impact on the head separating the head with respect to the shank, a first dimension of the rectangular base periphery is between 70% and 90% of the central web, and a second dimension of the head is greater than the wi central web.

According to another aspect of the invention there is provided a secu method including the steps of: lly ly curity -ismatic portions; necting the for close support.

rrugate the outer the outer Sof the f the ipport in the web; antially ially e and small enrally and wherein of the width ith of the -ity fencing COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02 23 23. Feb. 2007 8:34 Setn I o 32 P S h e I s t o n I P No. 1 31 2 P. 8 providing an elongate corrugated fence pale for securely attaching to a lateral o prismatic support member, the fence pale including: a pair of laterally spaced longitudinally extending corrugated portions; (N and a longitudinally extending ventral web integrally laterally co necting the oc' corrugated portions, the web having a substantially planar inner web surface for close o conforming abutting engagement wit a corresponding planar surface on the support o member, wherein in absence of secure attachment the corrugated portions corrgate INO between an outer lateral datum and an inner lateral datum spaced apart from te outer lateral datum, the web being located intermediate the inner lateral datum and the outer lateral datum such that upon the secure attachment the respective outer edges of the corrugated portions are tensionally engaged with the corresponding surface £f the su pport member, and securely attaching the pale to the prismnatic support member using a mounting is member, the mounting member including: a stainless steel shank insertable through a mounting aperture in the web; and a head integrally formed with the shank portion, the head being substantially defined by a dome having four minor segments removed to deie a substantially rectangular base periphery and thereby to provide a deflection rted curvature and small purchase area for substantially reducing the risk upon se ure attachment of generally downward impact on the head separating the head wth respect to the shank, and wherein a first dimension of the rectangular base periphery is between and 90% of the width of the central web, and a second dimension of the head is greater than the width of the central web.

Known corrugated fence pales leave air gaps proximal the mounting bohts when mourned to a fence in thie conventional manner. The present innovator has found that such air gaps adversely affect the overall integrity of fencing systems that use such pales. In particular, hitting the bolt with a hammer deforms the pale into the air gap, which. often loosens the bolt to a point where it is able to be removed by band even if a shear nut has been used. In overview, embodiments of the present innovation provide a fence pale that bolts to a fence rail without creating air gaps. This is achieved by using a pale with a central web having a substantially planar web for engaging, one afirst side, COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02923 23. Feb. 2007 8:34 S he Is t on I P No. 1312 P. 9 the substantially planar opposed face of the head of a T-bolt and, on the othe substantially planar opposed face of the rail. That is, the head of the T-bolt i flat against the pale, end the pale sits flush with the rail when the bolt is tigh Embodiments of the innovation include a specially designed T-bolt having t s that make it difficult for an intruder to knock the end off the bolt using a col hammer.

BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment of the innovation will now be described, by example only, with reference to the accompanying drawings in which: Figure 1 is a schematic representation of a fencing system including fence pale in accordance with an embodiment of the present innovation; Figure 2 is a schematic representation of the pale of Figure 1; Figure 3 is a cross-section of the pale of Figure 1; Figure 4 is a cross section of the pale of Figure 1 shown securely atta support member; Figure 5 is a to view of a securing member used in Figure 4; Figure 6 is a side view of the securing member of Figure Figure 7 is an end view of the securing member of Figure Figure 8 is a further end view of the securing member of Figure Figure 9 is a cross sectional view of a prior art corrugated fence pale attached to a support member; Figure 10 is a similar view to Figure 9, showing the prior art corruga pale deformed; Figure 11 is a schematic diagram of a fence pale cross section in acms an embodiment of the innovation; and Figure 12 is a schematic diagram of a securing member in accordanc, embodiment of the present innovation.

DETAILED DESCRIPTION Referring to the drawings, and in particular Figures 1 to 4, there is pr corrugated fence pale 1 for secure attachment to a lateral prismatic support n Pale 1 includes a pair of laterally spaced longitudinally extending substantial corrugated portions 3 and 4. A longitudinally extending central web 5 integi r side, the s able to sit ened.

Lpered edges I chisel and way of t corrugated ched to a securely ed fence irdance with with an vided a tember 2.

ly parallel ally COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 200 7 0 2 2 3 23. Feb. 2007 8:35 S h e Is ton I P No. 3 12 P. -8laterally connects corrugated portions 3 and 4. Web 5 has a substantially ph web surftce 6 for close conforming abutting engagement with a correspondi surface 7 on support member 2 upon secure attachment of the pale to the sur best shown in Figure 4.

In the present embodiment, a purpose-designed securing member 8 p secure attachment between pale I and support 2. This securing member is di greater detail further below.

In overview, pale I is used as part of a security fencing system 9. It, recognised that fencing system 9 is designed to prevent passage in direction System 9 includes a structural steel frame 11, and this includes horiz, support 2. More specifically, support 2 extends between vertical support me and 13, which in use are typically set in concrete 14. Frame 11 therefore prc general secure structure, which is not easily removed or damaged. Pales I a at spaced lateral locations on support 2, using a single securing member 8 fo is Typically, each location on support 2 is defined by a mounting aperture 15 fi a respective securing member 8.

Pales I are spaced along support 2 from member 12 to member 13 to barrier to passage in direction 10. In the present embodiment each pale I in( upper deterrent region 18 to deter persons from attempting to scale the fence zo deterrent regions are used in embodiments, and many options will be known skilled in the art, In some cases razer or barbed wire connects regions 18 of pales 1 as an added deterrent, In further cases, regions 18 are bent in a direc generally opposite direction As best shown in Figures 5 and 6, member 8 includes a threaded slim integrally connected to a head 21. In use, the shank is inserted in direction 1 mounting aperture 22 in pale 1, and then through an aperture 15 in support 2 nut 23 is then threadedly engaged with the shank and tightened to securely a pale to the support, and bring surface 6 into close conforming abutting engai surface 7. This in turn brings an inner surface 24 of head portion 21 into eM with a substantially planar outer web surface 25, and an inner nut surface 26 engagement with an outer support surface 27. Upon sufficient threshold fig! nar inner ig planar port as ovides the k flt with in vill be ,ntal tnbers 12 vides a r attached each pale.

r receiving provide a ludes an I Various by those adjacent ion Lk o through a A sheartach the ement with ,agement into tening of COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2 00 7 -02T 2 3 23. Feb. 2007 8:35 Seto IPN.1 2 P. 1 S h e I s t o R I P No. 1 3 12 P. I I shear-nut 23, a frangible unthreaded engagement portion 28 shears from an n- C) engagement threaded portion 29. This non-threaded portion is then loosely slidably removable from the shank in direction 10. Portion 28 is smooth and not easily grasped for turning, making it difficult to remove even with a shifting, spanner or socket Thiis will be appreciated by those familiar with shear-nuts in general. The sheaf g of portion 0c' 28 defines the secure attachment of pale 1 to support 2.

o Shear nut 23, and indeed member 8, is formed of stainless steel. The rationale for using stainless steel as an alternative to galvanised coated steel relates to the shearing o of portion 28. In particular, if a galvanised shear nut were used, the shearing of portion 1o 28 would expose an uncoated steel portion that is subject to corrosion. This orrosion reduces the efficacy of pale attachment, and the integrity of a fencing syste on the whole.

Pale 1 is typically manufactured using conventional steel bending technques in the first instance to provide the corrugations and web to a per-cut length of ate1.

Following bending, aperture 22 is formed, and region 17 shaped in the desired configuration.

Figures 9 and 10 illustrates a prior art corrugated fence pale 30. This prior art pale is continuously curvaceously corugated, and secured to support 2 at a cred region 3 1. When secured to support 2 using a similar support member S and shear-nut 23, air pockets 3 3 and 34 are defined. It has been recognised by the present inovator that these air pockets create a risk of pale insecurity. In particular, Wfan obje t strikes head 21 or region 3 1, pale 30 often deforms around these air pockets, as show in Fig.

Thiis reduces the distance 37 of surface 38 from surface 27, however, wit the reduction of distance 37, there is no corresponding reduction in the distance 40 between surfaces 24 and 26.

It will be appreciated that the deformation in Fig 10 is somewhat exagerated to illustrate the point in question.

The difference in distances 37 and 40 effectively loosens member 32, This increases the likelihood tat portion 25 is removable by hand, which would alow removal of pale 30. It also creates a weakness that results in easier separatio aof head 21 from shank 20 -for example upon strong impact with a hammer.

COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2 0 07 02 t 23 23. Feb. 2007 8:35 S he Is t on I P No. 1 312 P. 12 As shown in Figure 4, upon secure attachment of pale I to support 2, surfaces 6 and 7 ae in close conforming abutting engagement. As a result, there are nc air pockets, and it follows that a variance between the corresponding distances 37 and 40 is less probable. It follows that the abovementioned security risks associated with s uh air pockets are alleviated or indeed circumvented by pale 1.

Pale I is further configured to reduce the risk of variation between di and 40 by a tensioned attachment approach. Specifically, upon secure attacb surface 25 is resiliently outwardly biased into surface 24. This is achieved b portions 3 and 4, as discussed in greater detail below.

In absence of secure attachment, as shown in Fig. 3 corigated portic each corrugate between an outer lateral datum 45 and an inner lateral datum apart from datum 45. Web 5, and specifically surface 6, is located intermedi and datum 46. It follows that the respective outer edges 47 and 48 of por become progressively tensionally engaged with surface 7 as securing memb tightened to securely attach the pale to the support. Upon secure attachment the shearing of portion 28, surface 25 is resiliently outwardly biased into sur a result, a slight deformation of web 5 and/or support 2 is allowable without variation of distance 37 from distance 40, given that the lateral tension in pal distance 37 to increase to match distance 40. This approach is additionally e 2o reducing the risk of portion 29 from becoming readily manually removable a vibration, temperature related expansion or contraction, or other similar effei the tension substantially prevents a chisel or similar device being wedged inl surfaces 24 and In a preferred embodiment the separation dimension 49 of surface 7 1 46 is less than about 10% (or more preferably less than of the separatior from datum 46. This sizing option presents an advantageous balancing betw amount of force required to tighten nut 23 and provide hence secure attachm amount of resilience provided. Dimension 49 is also preferably selected by] the malleability of steel used to create pale 1. This malleability affects the e: which deformation of web 5 is possible even without air gaps.

In a specific embodiment, the separation of datum 45 from datum 46 18.90mm, and separation dimension 49 is 6mm. In this embodiment, pale 1 ;tances 37 ment, design of ns 3 and 4 6 spaced xrte datum ions 3 and 4 r8is marked by ke 24. As resulting in e I causes ffkctive in s a result of ;ts. Further, ermediate tom datum datum an the nt and the eference to ,tent to is is formed of COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02J23 23. Feb. 2007 8:36 S he Is to n I P No. 1112 P. 13 -11 0250 steel having a substantially constant thickness of about 3.0mm. This p particularly suitable balance it will be appreciated that as the thickness of s increases the amount of force required for secure attachment corresponding: for a given dimension 49, however the extent to which the steel is able to be s also increases.

Each corrugated portion 3 and 4 includes a respective pair of substan arm portions 51 and 52 converging toward and connected by a central curve( Of specific note, planar outer ann portions 51 result in a beneficial transfere tensional force from the corrugations to the web upon tensioned engagement to attachment. Specifically, the extent to which force causes irregularity in sur reduced, In any event, it is typically preferable to select an appropriate lateral for web portion 5. This should be sufficiently large to allow for some bendi: without the formation of air pockets behind the bolt as in the prior art. How web is too laterally wide, this results in substantial purchase being available or diagonal downward strike on head 21. There are also considerations riat preserving a threshold level of longitudinal rigidity in pale I. In a preferred, the web itself, and specifically sur.ce 5, has a lateral dimension 55 of at lea.

the total lateral dimension 56 of pale 1. Typically a dimension 55 of betwee 25 of dimension 56 is advantageous. In one embodiment, the total lateral is 71.34mnn, and the lateral dimension of surface 6 is 13.00mm.

In some embodiments the corrugated portions are not parallel, and as dimensions 55 and 56 vary along pale 1. In such cases the important dimens consider are those at the height of aperture 22.

Figures 6 to 8 illustrate securing member 8 in greater detail. Shank 2 21 are integrally formed from hardened stainless steel, such as AISI-304. At feature is that head 21 is geometrically configured to substantially reduce the secure attachment of generally downward impact on head the separating the respect to shank 20. In the present embodiment this is achieved by a oombin 3o approaches: resents a reel increases fattened Jally planar I portion 53.

ce of and secure hce 6 is imension g in web wer, if the :oi a lateral ngto ,mbodiment t 10% of 115% and dimension such ions to D and head important risk upon iead with ation of two COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02-23 23. Feb. 2007 8:36 Sheiston IP No. 1312 P. 14 o -12- Providing a general deflection rated curvature on the outer surfae 60 of head 21. The general notion is that an object striking surface 60 should deflect such that the majority of striking force is prevented from affeating member 8.

Providing a reduced separation of surface 60 from surface 24 at upper and 0' lower ends 61 and 62 of head 1.2 to reduce the purchase area ava lable for oupward or downward impact upon secure attachment.

NO As shown in the Figures, in use ends 61 and 62 are vertically spaced i alignment o with the general axis of pale 1. In a preferred embodiment the edge spacing of surfaces 1o 60 and 24 at ends 61 aid 62 is less th n about 3mm. An edge spacing of bet een and 80% of the maximum spacing between these surfaces is generally prefe ed, however in'some cases the spacing is less than this. In one embodiment, su aces 60 and 21 meet at each end 61 and 62 to further reduce purchase availability. Howe er, in such an embodiment it is advisable to use particularly non-malleable steel. The ional is that impact at either of ends 61 and 62 is may cause deformation at these thinner regions, which could in turn provide a surface for purchase.

As best shown in Figure 8, head 21 is substantially defined by a dome having a two pairs of opposite minor segments 64 ahd 65, and 66 and 67, removed along substantially parallel chords 67 and 68, and 69 and 70. This defines a substa tially rectangular bWe periphey. Width dimension 71 and height dimension 72 ae typically selected on the basis of geneial strength considerations and the width of web 5. i particular, dimension 71 should be less than-the width of web 5 such that bead 21 fits in.

the channel defined between corrugated portions 3 and 4. The closer the side edges 73 and 74 of heads 21 to portions 3 and 4, the less horizontal purchase available However, as if too close, there is a risk of tension induced air pocket effects. Preferably a dimension 71 of about 70% to 90% of the width of web 5 is chosen. In a spe cific embodiment dimension 71 is about Omm, and the width of web 5 is about 1 3m.

Height dimension 72 should be greater than the width of web 5 to facilitate c nvenent tightening of nut 23. In the mentioned specific embodiment dimension 72 is about 16mm.

In some embodiments minor segments 66 and 67 are not removed h that curvature continues to the edge where the outer and inner surfaces meet.

COMS ID No: SBMI-06359397 Received by 1P Australia: Time 09:48 Date 2007-02-23 23, Feb. 2007- 8:37 Shel ston IP No. 312 P. -13- The dome has a central flattened uppermost region 75 defining a plai having a circular periphery 76. This, although planar, is nevertheless benefii deflection perspective given that it is vertically displaced in use. That is, a v surface provides the least purchase for vertical impact. Indeed, vertically sp s purchase is only substantially available at ends 61 and 62, which are small, a regions 77 and 78, where there is curvature-based deflection. Horizontal pi of a concern given the protection provided by portions 3 and 4.

It will be appreciated that the combination of a planar inner web surf mounting, and purchased minimizing mounting hardware combine to allow of a particularly tamper resistant security fence 9. That being said, these fea their own provide individual and distinct advantages over known art.

Although the innovation has been described with reference to a speci it will be appreciated by those skilled in the art that the innovation may be ex many other forms.

ar top ;ial from a ertical aking ad along chase is less ice, resilient ;onstruction ures on ic example, abodied in COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02J23

Claims (1)

1. 23. Feb. 2007 8 3 7 etn Io 11 1 S h e I s t o n I P No. 1312 P. 16 o -14- THE CLANMS DEFINING THE INNOVATION ARE AS FOLLOWS: I. A security fencing system including: en an elongate corrugated fence pale for securely attaching to a lateral p ismatic. support memhber, the fence pale including: a pair of laterally spaced longitudinally extending corrugated portions; 00 and o a longitudinally extending central web integrally laterally co ecting the corrugated portions, the web having a substantially planar inner web surface for close o conforming abutting engagement with a corresponding planar surface on the support member, wherein in absence of secure attachment the corrugated portions c gate between an outer lateral datum and an inner lateral datum spaced apart from te outer lateral datum, the web being located intennediate the inner lateral datum and the outer lateral datum such that upon the secure attachment the respective outer edg of the corrugated portions are tensionally engaged with the corresponding surfaice £f the support member; and a mounting member for securely attaching the pale to the prismatic support member, the mounting member including: a stainless steel shank insertable through a mounting aperture in the web; and. a head integrally formed with the shank pardion, the head being substantiall y defined by a dome having fbur minor segments removed to define a substantially rectangular base periphery and thereby to provide a deflection rted curvature and smnall purchase area for substantially reducing the risk upon seure attachment of generally downward impact on the head separating the head wth respect 2!s to the shank, and wherein a first dimension of the rectangular base periphery is between and 90% of the width of the central web, and a second dimnension of the head is greater than the width of the central web. 2. A security fencing system according to claim I wherein the dome has a central flattened uppermost region defining a planar top havig a circular periphery. so 3. A security fencing method including the steps of: providing an elongate corrugated fence pale for securely attaching to a lateral prismatic support member, the fence pale including: COMS ID No: SBMI-08359397 Received by IP Australia: Time 09:48 Date 2007-02123 23. Feb. 2007 8:37 S he Is t on I P No,13 12 P. 17 o -15 0 a pair of laterally spaced longitudinally extending corrugated portions; ,.0 Cand a longitudinally extending central web integrally laterally con ecting the corrugated portions, the web having a substantially planar inner web surface or close s conforming abutting engagement with a corresponding planar surface on the rapport 00 member, wherein in absence of secure attachment the corrugated portions cor rgate o between an outer lateral datum and an inner lateral datum spaced apart from 1he outer lateral datum, the web being located intermediate the inner lateral datum and the outer INO lateral datum such that upon the secure attachment the respective outer edges of the corrugated portions are tensionally engaged with the corresponding surface o the support member; and securely attaching the pale to the prismatic support member using a t ounting member, the mounting member including: a stainless steel shank insertable through a mounting aperture n the web; and a head integrally formed with the shank portion, the bead being substantially defined by a dome having four minor segments removed to def e a substantially rectangular base periphery and thereby to provide a deflection r fted curvature and small purchase area for substantially reducing the risk upon sec ure attachment of generally downward impact on the head separating the head with respect to the shank, and wherein a first dimension of the rectangular base periphery is between. and 90% of the width of the central web, and a second dimension of the head is greater than the width of the central web. COMS ID No: SBMI-06359397 Received by IP Australia: Time 09:48 Date 2007-02-3