NZ627015B - Height Safety Anchor - Google Patents

Abstract

Disclosed is a height safety anchor (11a) for fitment to a building support structure to provide fall protection through reduced shock forces or impact to a user that was located on a roof or high structure without safety barriers. The height safety anchor comprises a first attachment means 15a for fitment to the building support structure; a second attachment means 16a remote from the first attachment means for attaching safety equipment; and shock absorbing means 13a having a serpentine plastic deforming shock absorbing member having a deformable region 19 extending between the first and second attachment means in a first length when not subject to a deformation force corresponding to a critical sudden load, the shock absorbing means lying substantially in a single plane and comprising a substantially rigid structure that, when subject to the critical sudden load, deforms, elongating to a greater length than the first length. The first attachment is attached to the building support structure by engagement to a flexible and high tensile elongate member (12) such as a steel wire cable of rope comprising a plurality of spaced eyelets (18a) that are slidable along the elongate member. fitment to the building support structure; a second attachment means 16a remote from the first attachment means for attaching safety equipment; and shock absorbing means 13a having a serpentine plastic deforming shock absorbing member having a deformable region 19 extending between the first and second attachment means in a first length when not subject to a deformation force corresponding to a critical sudden load, the shock absorbing means lying substantially in a single plane and comprising a substantially rigid structure that, when subject to the critical sudden load, deforms, elongating to a greater length than the first length. The first attachment is attached to the building support structure by engagement to a flexible and high tensile elongate member (12) such as a steel wire cable of rope comprising a plurality of spaced eyelets (18a) that are slidable along the elongate member.

Description

HEIGHT SAFETY ANCHOR HAVING SHOCK—ABSORBING MEANS PATENT OF ADDITION or CONTINUATION~IN-PART This is an application for a patent of addition based on Australian patent application No. 2012216652, New d patent application No. 602265, or a Continuation-in—Part ofUS Patent ation No. 13/604,464, the entire contents of each of which are incorporated herein by reference.

CAL FIELD The application relates to a height safety anchor for attaching devices, apparatus or equipment to a roof surface and, more particularly, to a height safety anchor for fitment to a building structure clad with metal sheeting, the height safety anchor also including shock absorbing means. The devices, apparatus or equipment to be attached may e safety equipment such as safety harnesses, ropes or other safety devices adapted to secure a height safety worker against falling and injury.

Whilst the invention derives particular advantage when used in conjunction with a metal roof, it may also be utilized with any roofwhere access to the structure supporting the cladding is feasible and accordingly no limitation is implied by a y reference to metal roofs in the ing description.

BACKGROUND ART The following nces to and descriptions ofprior proposals or products are not intended to be, and are not to be construed as, statements or admissions of common general knowledge in the art. In particular, the following prior art discussion does not relate to what is commonly or well known by the person skilled in the art, but assists in the understanding of the inventive step of the present invention ofwhich the identification ofpertinent prior art proposals is but one part.

Several solutions have been proposed for providing anchor points on a roof or ng structure, but these are normally intended for permanent fitment. Such anchor points are made available so that a person working on the roof or other building uure, for example, can attach fto the anchor point by means of a rope or cable, etc, so that in the event of a fall, he will be constrained from falling off the building.

Thus, conventional height safety anchoring devices for permanent fitment require access to the building t structure such as a batten or rafter. Direct access to the support structure is generally required and involves mounting the height safety anchor prior to the application of the al covering ofthe roof such as tiles, sarking, sheeting or other cladding so that upon application of the external covering to the support ure, the height safety anchor extends beyond the external covering. The anchor will, of course, need to be suitably flashed to provide a weather—proofed fitment.

On the other hand, if the external covering has already been applied to the building support structure, then at least one unit of the external covering, e. g., a single sheet of covering, must be removed to provide access to the building support structure. Thus, for example, where large units of sheeting form the external covering of the roof, considerable time and effort may have to be expended to remove a single unit to gain access to the roof support structure. rmore, there is also a risk that damage to the covering may occur or, more particularly, once it is re—laid, the covering might not properly seal against the ts.

However, the removal of the covering as described above may be impractical or inconvenient.

Alternatively, so~called retro~fit systems have been developed that provide a solution for securing a pennanent anchor point by using a tool h an access ty, i.e., a relatively small g, for example, which is then later sealed.

In any event, all ofthe foregoing solutions have as their basic premise that the anchor is left permanently in place once fitted. This, however, may not be convenient or even desirable having regard to aesthetic considerations and may be unnecessarily wasteful as there may be little need for an anchor point at any time in at least the foreseeable future. Furthermore, anchor points may be desired at various locations, particularly as work progresses on a site, once again adding to the total cost if several ent anchors are utilized.

To this end, a solution that provides for an anchor point, especially one that could be fitted to a metal roof and d after any necessary work has been completed, would be advantageous.

A useful solution to this problem, therefore, presents itself when one takes into account the typical way in which a metal roof is constructed. Typically, metal cladding is affixed with screws at intervals along a batten, which, in turn, is affixed to s in typical n. A solution is, therefore, available by simply removing sufficient screws from a section of cladding and affixing a suitable temporary anchor over the cladding by ing the existing screws using the existing holes through the cladding. Thus, the screws would then pass through suitable holes in the temporary anchor and through the existing holes in the cladding and, thence, into the supporting structure below. Upon completion of the work, the screws can then be removed again, the temporary anchor removed, and the screws replaced once more to hold the cladding in place as it was originally affixed.

In this way, there would be no need to disturb the roof structure or cladding in any way other than to remove some of the existing screws in order to attach the temporary anchor, the screws being replaced after the necessary work on the roof has been completed and the temporary anchor has been removed.

This would provide a simple, useful and ic solution to the problem of providing a removed ary anchor point for safety equipment and the like, which could then be readily location on once the work was completed. The temporary anchor could then be used at another the same site or taken away altogether and used on another site.

Of course, such a solution would still need to be ive in ensuring adequate safety standards to meet the are met, that is to say, the anchor itself, in conjunction with its fitment, would need ary safety standards. It should be stressed that anchors that have hitherto been suitable for permanent fitment do not lend themselves to attachment as ary anchors in this way.

The original invention therefore advantageously provided a temporary anchor that could not only to meet the desired safety standards, but that was itself designed to be portable so that it could easily taken from one work site to another.

However, it would also be advantageous to provide a height safety anchor that could be ally permanently affixed directly to a supporting building structure. eg. for a metal clad roof, by affixing the anchor through the metal ng at points already ed for screwing the cladding to the structure, without otherwise disturbing the metal cladding itself.

It would also be further ageous if such a height safety anchor system was provided with shock-absorbing means in order to minimize injury from a person utilizing the anchor point in the event of a fall. Further, it would also be desirable ifthe anchor point were multi—directional to the extent that it worked efficiently no matter from which direction forces might be applied in the event of a fall.

In addition, it would also be advantageous if such an anchor could also be fitted directly to any stable structure, including the supporting structure for a tile roof, albeit with the necessity of removing some tiles or other cladding, etc., to allow access to the underlying ure where applicable.

OBJECT OF ION It is therefore an object of the present ion to provide a height safety anchor ally for metal clad roofs which ameliorates one or more of the aforementioned disadvantages associated with the prior art, particularly by providing a anchor point that may be mounted directly over the metal roof cladding, utilising the existing fixing points for the metal cladding itself, the anchor being so constructed as to ssively absorb the effects of a sudden load applied thereto, and wherein the anchor functions usefully in all directions. ' It should also be understood that while the disclosure relates primarily to the attachment of a anchor to a roof as described, it will also be applicable in many other instances Where attachment of a device to another surface or structure is required, whether a wall or ceiling, for example.

Thus, any reference to a roof, r metal or otherwise, is also meant to encompass reference to any structure, where, by suitable adaptation, the device may also be utilised.

DISCLOSURE OF THE ION According to the t improvement to the invention, there is provided a height safety anchor for fitment to a building support structure, the height safety anchor comprising: first attachment means for fitment to the building support structure by engagement to a flexible and high e elongate member comprising a plurality of spaced eyelets that are slidable along the elongate member; second attachment means remote from the first attachment means for attaching safety equipment; shock absorbing means having a able region extending between the first and second attachment means in a first length When not subject to a deformation force corresponding to a critical sudden load, the shock absorbing means lying substantially in a single plane and comprising a substantially rigid ure that, when subject to the critical sudden load, deforms, elongating to a r length than the first length.

The elongate member may be in the form of a cable. The cable should be relatively flexible in the sense that it can sustain some bending over a portion of its length. The cable should have high tensile strength. The cable may be made from metal or plastic rope. The cable may be formed from galvanized iron, steel and the like materials. It is strongly preferred that the cable is formed from and comprises stainless steel cable. Care should be taken to meet safety standards in fitting any height safety ent.

The slidable eyelets may comprise a loop surrounding a portion of the cable. The loop may be a sleeve formed from a plate pressed onto and around the cable. The eyelets may therefore be formed from any number ofmetal working s. The eyelets may be formed from stamped plates or, ably, by laser cutting. The flat plates so formed are then pressed into shape to form a loop section about the cable. The plate is preferably folded back on itself.

The eyelet may comprise a tab portion include an aperture for receiving a fastener and a folded portion. The folded portion may form a tongue plate that wraps back around the cable with one end of the tongue attached to the tab and the other end adapted to wrap around so that it abuts, or rests close to, the transition or junction between the tab and the tongue plate.

The eyelet may be bisymmetrical and the tongue plate may ate at each end with a tab comprising an aperture for receiving a fastener. The eyelet is therefore preferably d to fold generally or substantially symmetrically. Each eyelet may se a pair of holes, one at each end of the plate, preferably one hole in each ofthe tabs, that register when the plate is pressed about the cable. The pair of holes may receive a fastener, such as a screw or clamp, and by the fastener be secured to the building support structure.

The building support structure may be a roof or wall on or against which elevated work is ed to be performed with attendant risks to unsecured workers. Accordingly, the height safety anchor is structurally sufficient to sustain a critical load that alls from work on a vertical ure, such as a building wall. However, more typically, the height safety anchor will be deployed in securing a worker to a roof structure, such as a metal clad and/or timber frame roof. In its preferred form therefore, the height safety anchor is a roof anchor. The height safety anchor may be installed temporarily whereby the fasteners are undone and the eyelets released, or alternatively, the height safety anchor may be left permanently installed. Preferably, where ent lation is required and the height safety anchor is likely to be exposed to the weather, the cable, shock absorber, fasteners and the eyelets will be corrosion resistant and made from the same al, such as galvanized or stainless steel.

The slidability of the eyelets along the cable not only permit adjustability in the positioning of the shock absorber, and therefore the second ment, but also provides for r energy dissipation in the event of the application of a sudden critical load to the second attachment.

The height safety anchor preferably further includes end sockets. The end sockets may comprise a swage sleeve. The end sockets may be formed from cable looped back around or on itself. The aligned cable lengths may be welded or clamped. The end socket may be formed by a cable loop with the cable looped back on itself near its end and swaged. The end sockets preferably comprise eyelet bolts threaded into swaged end sleeves.

The shock absorbing means may include the second attachment in the form of a ring. The shock absorbing means may also include a series of folded portions g a concertinaed length, one end of which connects to one side of the ring so that one section of the ring is positioned nt a straight edge of the last portion of folded length of the series of folded portions.

The shock absorbing means may engage the elongate member by feeding a length of the elongate member through a pair of spaced holes formed in an end plate of the shock absorbing means.

Preferably, the end of the tinaed length opposed to the end connected to the ring is connected to one side of the end plate so that one section of end plate is positioned adjacent a straight edge of the last portion of folded length of the series of folded portions.

The second attachment may be in the form of any suitable height safety equipment. Typically a D—clamp or carabiner may be used to attach the height safety equipment to the second attachment.

In the basic invention, there was ed a roof anchor for fitment to a roof support structure or the like, especially a roof support ure having metal cladding affixed thereto, wherein the anchor is provided with a first attachment means for fitment of the roof anchor to the roof support structure, a second attachment means remote therefrom for attaching s, apparatus or equipment, especially safety equipment, o, and shock-absorbing means located therebetween so as to progressively distort under sudden load, and wherein the first attachment means of means comprises a webbing material having a plurality of spaced apart fixing points by which the webbing material may be affixed to the roof support structure utilizing the existing fixing means that hold the metal cladding to the roof structure.

Preferably, the shock absorbing means is in the form of a metal bar or narrow plate, cut so as form a concertina arrangement that can progressively deform under load. Preferably, the shock absorption is provided by one or more suitably shaped portions of al cut or otherwise formed so that when a force is d thereto, there is created a deformation therein in the form of a generally linear extension of that portion, i.e., by effectively straightening or ding” such region. Thus, the anchor is so designed that ation by bending, i.e., unbending or straightening, of the shock—absorbing region, in ation with either of the attachment regions as described herein, where appropriate, provides an absorption of the forces d to the anchor from any angle, that is to say, if a load is exerted from any direction, the anchor is able to accommodate that sudden load in suitable fashion. In this way, the anchor will provide a suitable shock—absorbing means against, for e, a sudden load arising from a person attached thereto falling from the roof.

With advantage, the shock absorbing means in the form described may be covered with a rubber sleeve or similar covering to protect it.

This sleeve may also provide a region Where safety instructions may be written.

On the other hand, any suitable shock-absorbing means may be utilized that functions to dampen the forces applied under sudden load, such as when a person attached to the roof anchor falls from the roof.

The devices, apparatus or equipment to be attached may include safety equipment such as safety harnesses, ropes or other safety devices adapted to secure a roof worker t falling and injury. While the devices, apparatus or equipment s particular advantage when used in conjunction with a metal roof, it may also be utilized with any roof where access to the structure supporting the cladding is feasible and, accordingly, no limitation is implied by a primary reference to metal roofs in the following description.

Although any suitable attachment means may be utilized to affix safety equipment and the like, preferably, the second attachment means by which the safety equipment such as a harness, etc., is attached to the absorbing means is in the form of a simple eye located near its extremity, remote from where it is attached to the roof structure, and through which the safety equipment may be attached in known fashion.

The webbing material providing the attachment means for affixing the anchor to the roof structure in the original invention was a ter g capable of supporting a high tensile load, for example, in excess of 10 tonnes. While polyester webbing is the red material, any webbing material, including nylon and/or ites, having the ability to withstand r loads may be employed.

Tthe webbing is a single length of g material, although other arrangements adapted to perform as described may be utilized. Where a single length of webbing is employed, it has been found that a suitable length is around 1.5 to 2.5 m in length, preferably about 2 ~ 2.2 meters.

With advantage, this length ofwebbing can be inserted through a slot provided in the end of the absorbing means remote from the end having the means to attach the safety devices, etc, thereto. In this way, the webbing may extend for imately equal lengths either side ofthe slot. By affixing the webbing to the roof structure at either side of the slot, allows for the shock—absorbing means to move to some extent between at least the first fixing points located adjacent to and either side of the slot located in the end of the shock absorber. This allows the ' anchor to function ively in all directions.

Preferably, the fixing points in the webbing are holes. More preferably, the fixing points are reinforced holes, formed in the webbing.

The preferred method of attaching the webbing to the roof structure in the al invention was by utilizing screws inserted through the holes in the webbing and into the supporting structure of the roof material. However, other forms of fixing may also be utilized, as discussed below, and no limitation should be inferred from a general reference to screws as the medium by which webbing is attached to the roof.

Six such holes may be provided in the webbing material, so as to spread the load, as described later herein. Under conditions where a fall occurs, successive screws will take the load and should the first screws adjacent the shoc1<~absorbing means fail, successive screws will then take While six holes has been up the load, causing a diminishing of the forces as the fall progresses. found to be most preferable, other numbers of holes may be employed, although it will be appreciated they will generally be in pairs, to provide an equal number of holes either side of where the webbing attaches to the shock-absorbing means. In its most simplest form, of course, even one hole may suffice where the length of webbing is, for example, simply looped back on itself and joined. However, given that safety considerations are paramount, it is preferred to utilize additional holes to provide additional attachment points should those closest to the shock-absorbing means fail. Thus, it is red to have at least four holes and, more preferably, at least six, where a single length ofwebbing is passed h a slit in the end of the shoclcabsorbing means as described above.

While it is red that the shock—absorbing means has sufficient energy—absorbing capability so as to deform under load without allowing any of the screws to pull out, the provision of six holes, i.e., three either side of the slot in the shock absorber, provide for onal safety should the first screws adjacent the shock absorber fail. To provide added safety, six, rather than merely four screws, are ended.

With advantage the holes in the webbing are provided with metal reinforcements in the form of metal eyelets formed through the web. It is preferred that the holes be formed in the webbing material by spreading the fibers apart rather than cutting through the webbing. On the other hand, any means by which holes are formed may be contemplated. Compensation for d strength may be made by widening the amount of material in the webbing, for example. In any event, the metal eyelets then provide suitable reinforcement for such holes through which screws holes in the metal ng and into may be fitted, the screws then passing through the original the support structure. The metal eyelets protect the webbing when inserting the screws and provide a reinforcement so the head of the screw is constrained from passing through the webbing, either during insertion of the screw or subsequently, should the anchor be subjected to a sudden fall from a person attached thereto.

Conventionally, eyelets are formed by utilizing a two~part construction, there being a male portion and a female portion, such that the male portion has a tubular portion that s h the hole and is pressed over, i.e., crimped or expanded over, the female portion on the other side, forming a flange after the tubular portion passes h the hole in the female portion.

However, as the webbing required for the original invention is of necessity one having a very robust construction, conventional s have been found to be inadequate, generally inadequate especially where vely thick webbing material is utilized, e.g., greater than about 3 mm in thickness. Again, however, where suitable compensation is ise made by, for example, using broader webbing to compensate for a narrower thickness, conventional eyelets may be employed.

In relation to the preferred webbing structure, however, having a thickness in excess of, say, 3 the use of a three-part eyelet mm, a simple ative has been ped that involves assembly, comprising two identical washers placed either side ofthe hole with a ferrule passing therethrough, each end of which is then caused to be pressed over both washers, i.e., forming flanges from both sides, in the same way as the tubular portion of a conventional eyelet is pressed on one side as described above, but in this case, doubled here to form each side ofthe eyelet structure.

With advantage, this eyelet, ing to the original invention, can be inseited in such heavy webbing material by having a series of spikes mounted along a supporting member, over which the g can be forced to first create the required holes by spreading the fibers rather than cutting them. With a washer already located below the hole, i.e., on each spike, it is then a simple matter to slide the ferrule down the spike and force it through the hole, and fit another washer over each spike. A simple press arrangement then es from each side, causing each end of the ferrule to form a flange on either side, which then binds each washer to each side of the respective holes formed in the web, creating an effective three-part metal eyelet having greater robustness than is attainable from a two-part eyelet assembly.

Thus, in typical applications where metal sheeting is affixed to a roof structure with existing screws, when affixing the anchor, the screws that hold the metal cladding are simply removed, the anchor d in position and then held in place utilizing those or other screws if necessary, by inserting the screws through the holes in the webbing, then passing through the original holes in the metal cladding and thence into the supporting structure, generally a . Once the work is completed, the screws may then be removed again, the temporary anchor taken away and the screws refitted to hold the metal cladding in the way it was originally found. Alternatively, anchor may be left in place permanently, as required.

It is, of course, necessary that the screws hold the anchor firmly and to this extent, a different length of screw (albeit with the same gauge) may need to be utilized to ensure proper ation into the ying batten. In the case of a timber , it has been found that the screws should penetrate at least 35 mm into the batten. Similarly, it is necessary with metal battens that the screw thread s properly with the batten to avoid so—called overpassing ofthe thread as most roofing screws have a blank or unthreaded region below the head of the screw.

On the other hand, the disclosure is not meant to be limited to the use of screws as aforementioned and any suitable fixing means may be employed, either by affixing to the underlying roof structure through existing holes or even to the roof sheeting itself, provided the fixing of the sheeting to the underlying structure is sufficiently sound and the means by which the webbing is attached to the sheeting or structure is sufficient to withstand the forces discussed above.

In this regard, for example, so—called Klip Lock roofs do not have holes therethrough but are otherwise “clipped” down. By suitable adaptation, other fixing means that allow the webbing to be ed to such sheeting are, therefore, meant to be within the scope ofthe invention.

By utilizing a webbing al in the original invention, having as its major advantage complete flexibility, it will be understood that a variety of metal cladding profiles may thus be accommodated, the excess material between each fixing point, i.e., hole, simply allowed to form a loop between each fixing point. In other words, the use of webbing material allows for simple adjustment to odate different profiles of metal cladding and different spacings of screws placed therein, while still providing adequate support for the anchor if subjected to a sudden load.

Alternatively, where the roof support ure supports other than metal cladding, the webbing material may be affixed instead directly to the roof t structure after sufficient roof covering material, for example, tiles, has been removed, In such cases, the screws should be fitted preferably at least 100 mm apart along a rafter or . Therefore, although primarily intended for use with a metal roof, the anchor, according to the ion, could be fitted to a tiled roof or any other suitable stable structure, by ing directly to the supporting structure, such as a rafter or batten, after removing one or more tiles as necessary to gain access to the ying support structure.

Preferably, the webbing ofthe original invention and the way in which it is d to the roof support structure and/or the roof cladding as described herein, co—operate with the shock-absorbing means to r assist in minimizing the forces experienced should a fall occur.

It will be understood from the embodiments bed herein, that the design as described herein is able to function, ective of the direction of the load.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood from the following non-limiting description of various aspects of an embodiment of the invention with reference to the drawings in which: is a perspective View of a temporary roof anchor according to one embodiment of the original invention; is a plan View of a suitable —absorbing shock absorber for use in the roof anchor shown in is cross—sectional side elevation showing a detail of the eyelet for use in the temporary anchor shown in is a schematic side elevation of a temporary roof anchor shown in showing it affixed to a metal or timber batten supporting a metal roof cladding; is a simple plan view of a temporary roof anchor shown in attached to the rafters of a tiled roof after removal of tiles; is a schematic side View of a height safety anchor according to an improvement ofthe invention ing to one embodiment; is a schematic side view of a height safety anchor according to an improvement ofthe invention according to another embodiment; is a cross sectional schematic view of a slidable eyelet mounted on a cable according to one embodiment; is a top ion of a pre—pressed slidable eyelet plate according to r aspect of the improvement ofthe invention; is a top ion of a shock absorber according to another aspect of the improvement of the invention; and Fig. 11 is a schematic side view of the height safety anchor according to an improvement of the invention according to another embodimentDETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS Referring generally to there is shown a roof anchor generally referenced 11 according to one embodiment. The roof anchor 11 comprises a webbing al 12 and a shock absorber 13.

Shock absorber 13 (shown in detail in is sheathed in a rubber or latex sleeve 14 or similar sleeve. Extending from one end of the shock absorber 13 is a slot 15 through which the length of webbing 12 is inserted. The other end of the shock absorber 13 is provided with a hole 16 to which safety devices such as a harness or rope (not shown) may be attached.

The webbing is provided with six holes 17 spaced along its length at approximately 300 to 400 mm centers. The holes 17 are preferably formed by piercing the webbing 12 to separate fibers, rather than cutting a hole in the webbing 12 , which would weaken the webbing 12 at that point. These holes 17 are further provided with metal s generally referenced 18 to provide rcement. The construction of each eyelet 18 is shown in detail in The holes 17 allow for fixing the temporary anchor 11 to a roof structure as shown in FIGS. 4 and 5.

Referring to there is shown in detail the shock absorber 13, which is made from a sheet of stainless steel, 6g, 3 mm thick, die out to produce the aforementioned slot 15 at one end for reCeiving a length of webbing 12 and a hole 16 at the other end to which safety devices such as harnesses and the like may be attached. etween is a region of concertina—like bends, generally referenced 19, formed by die cutting. Upon experiencing a sudden load, such as would 13 is occur when a person attached to the temporary roof anchor 11 ofwhich this shock absorber concertina a part, the shock absorber 13 is caused to extend by, as it were, “unbending,” i.e., region 19 straightening out. This action provides for a cushioning ofthe initial load when it is first applied, thereby effectively diminishing the energy of the load as the deformation progresses.

The sleeve 14 described above protects the shock absorber 13 and may also be usefully used to display safety instructions etc.

Referring to there is shown a three~piece metal eyelet configuration, generally referenced 18, as used in the temporary anchor of The eyelet 18 comprises two washers 20, which are caused to be pressed against either side of a hole 17 extending h a portion of webbing material 12 as bed above. A ferrule member 21 is located through the hole 17 in the g 12 and by means of a press (not shown) has been bent at each end to form flanges 22, which secures the eyelet assembly 18 in place, y reinforcing the hole 17. The metal construction ofthe eyelet 18 not only provides stability to the holes 17 formed by separating the fibers as described above, but also protects each hole 17 formed in the webbing 12, 6g, when inserting a screw therein (as shown in FIGS. 4 and 5), and, rmore, also ins the integrity ofthe webbing 12 in use so that it will not pull away from the head of the screw once fitted to a roofing structure.

Referring then to there is shown schematically a ary anchor 11 as bed in FIGS. 2 through 3, attached to a g structure, in this case a batten 23 supporting a sheet of metal roof cladding 24. Batten 23 is shown schematically as both a metal batten 23a and a timber batten 23b. In each case, however, suitable hex—headed roofing screws 25 have been utilized, as is the norm.. It is generally preferred that the screws in the timber batten 23b extend at least 35 mm into the batten 23, while in the case of the metal batten 23 a, it is necessary to ensure that the threaded portion 26 ofthe screw 25 engages in the hole of the batten 23a without over extending as described earlier.

In either case, screws 25, which initially secured the roof cladding 24 to the respective batten 23a, 23b, have been removed and replaced after the temporary anchor 11 has been located thereon. Either the original screws 25 have been utilized or other screws 25 ofthe same gauge but of an appropriate length as described have been used.

The length ofwebbing 12 is allowed to simply “buckle up” or concertina along its length between respective screw attachment points.

With nce to there is shown an attachment of a temporary roof anchor 11 to a pair of rafters 27, which have been exposed after a suitable number of tiles 28 have been removed. In this ce, it is preferred that the screws 25 be located at least 100 mm apart.

In either case, as illustrated in or if a sudden load is applied to the temporary anchor 11 as would occur from a person attached thereto falling from the roof, the bulk of the shock absorber 13 as it “unbends” as described energy absorption will be initially taken up by the above. If, for any reason, the first pair of screws 25 fail, the load will be progressively taken up by the next pair of screws 25, all the while the energy being dissipated as the fall, and hence the shock absorption, progresses. The provision of six screw holes 17 in the webbing 12 is to provide additional safety against failure.

Should the temporary anchor 11 be used in a fall, then it should be discarded. Otherwise, it may be removed by undoing the screws 25, taken away and, in the case of a metal roof as shown in the original screws reinserted in the existing ons to once again secure the roof, or the case of the tile roof shown in the tiles placed back in position.

Referring to there is shown an improved height safety anchor 11a in which the webbing 12 ofthe height safety anchor 11 (shown in Fig. 1) is replaced with a metal cable, such as a ess steel cable 12a. The metal cable 12a is flexible with high tensile strength. Mounted to the cable 12a is a shock absorber 13a that is similar in shape and function to the shock absorber 13. However, the shock absorber 13a is threaded onto the cable 12a, generally at cable’s 12a mid-point, by threading the cable 12a through a pair of spaced aperatures 15’,15” located in an end plate 15a of the shock absorber 13a, whereafter the shock absorber 13a is generally fixed in position at some place along the length of the cable 12, for example at its mid-point, when the cable 12a is generally straightened. The skilled person will appreciate that the flexible cable 12a absorber 13a to be shifted in position along the length of may be manipulated to allow the shock the cable 12a, as required. The res 15 ’,1 5” are holes formed in the end plate 15a, so that the region of concertina—like bends 19a extend between the end plate 15a and a larger ring 16a, the large ring 16a being r to the hole 16 of the shock absorber 13. A crook or space 19’ provided n the large ring 16a and a first fold ofthe concertinaed region 19a to permit increased lity of the large ring 16a relative to the folded portion 19a in the event of activation with a subject attached falling.

Slidably mounted to the cable at intermittent locations along its length are a plurality of eyelets 18a that are loosely or closely d onto the cable 12a ing on application requirements and may be slidable along the s length. This may provide adjustability as to where the eyelets 18a are secured by fixing points or fasteners 25, as described with reference to the metal eyelets 18 of the height safety anchor 11. Figure 8 provides an example ofhow the le eyelet 18a can be pressed on to the cable 12a. The fasteners 25 may be screws or other fixing means, such as clamps or bolts.

At either end of the cable 12a, a closed swage socket 30 is swaged onto the end of the cable 12a to form an end eyelet 31. The closed swage socket 30 comprises a swage sleeve 32 swaged the end of the metal cable. The swage sleeve 32 may be internally threaded at its remote end and the end eyelet 31 may include a threaded bolt that can be threadably received in the swage sleeve 32 whereby end eyelets 31 may be replaced or substituted for different sized eyelets 31, or to replace damaged eyelets 31, for example, following activation ofthe height safety anchor 11a after a fall. rates another improved height safety anchor 11b in which the same shock absorber 13a is used as that shown in and the slidable eyelets 18a are also r to that ofthe embodiment shown in However, instead ofthe closed swage sockets 30 ofthe height safety anchor 11a, the height safety anchor llb comprises open swage sockets 35 on the respective ends of a e metal cable 12 b. The open swage sockets 35 are integrally or unitarily formed With respect to their respective swage sleeve 37 that is swaged onto the respective ends of the cable 12b, the end eyelet 36 being integrally formed with the swage sleeve Accordingly, in use the height safety anchors 11a, llb are mounted to a building structure, such as that shown in or The advantage of the improved height safety anchors, 11a, ‘ 11b, is in the superior strength of the stainless steel cable, 12a, 12b, whilst retaining adequate flexibility with regard to ease of attachment to available fixing points on the building structure, particularly aided by the ability of the slidable eyelets 18a along its length. Preferably, as shown in FIGS. 6 and 7, four slidable eyelets 18a are ed ediate the length of the cable, 12a, 12b. However, of course the number of eyelets 18a, 18b may be varied, together with the length ofthe cable 12a, 12b, depending on the application and the requirements of a particular installation, the typical length of cable being between 1-3 metres, and preferably, about 1.8-2 metres in .

The provision of the apertures 15 ’,15 ’ ’ in the end plate 15a of the shock absorber 13a allow the shock absorber 13a to be moved in position along the length of the flexible cable, 12a, 12b, so that a first length of cable 12’ might be longer or shorter than the remainder or the second length of cable 12”. ingly, both improved height safety anchors, 11a, 11b have facility for adjustment in situ and the height safety anchor 11a further provides for replacement or interchangeability of the end eyelets 31.

In Figure 9 there is shown a pro-pressed plate 40 that is used to form an eyelet 18d. The plate is generally d shaped and has a pair of opposed d ends 41 in each ofwhich there is centrally'located an aperture 41. Extending between the rounded ends 41 is a broad plate region and a centrally located transverse channel section 43. In this embodiment of the eyelet 18d, the eyelet plate 40 is gripped at its ends 41 and pressed to fold and wrap around a cable 12” so that the cable 12” rests in a channel 43 formed as the walls ofthe plate 40 are folded towards one another and as the holes 42 are folded into registration with one r. The length of cable 12”, d in this manner, can then be ed to a building supporting structure by inserting a fastener 25 through the holes 42 and fastened to the building supporting structure. The pressed fit ofthe ble eyelet 40 may be sufficiently loose about the cable 12” so that the eyelet 40 is able to be adj'usted in position along the length ofthe cable 12”. Alternatively, the eyelet 40 may be secured by friction fit against sliding along the length of the cable 12” and may be loosened by slightly reversing the pressing process to release the friction grip ofthe eyelet l 43 on the cable 12” to permit at least limited movement of the eyelet 40 along the length of the cable 1 2”.

Turning to Figure 10, there is shown another version ofthe applicant’s shock er 130. The shock absorber 130 comprises slots to enable a cable 12” to be fed through the pair of apertures 150 to permit the cable to be advantageously fixed at a particular position on the length of the cable 12” and also to be loosened for adjustment along the length of the cable 12”, when required. The first attachment loop 160 comprises flat outer edges to provide a gripable surface In Figure 11a height safety anchor 11d similar to that shown in Figures 6 and 7 is provided. The height safety anchor 11d utilizes the pressed eyelet 18d formed from the plate 40 comprising a pair of apertures 42 and described in Figure 9. The height safety anchor 11d comprises a cable 12d made from stainless steel or galvanized cable that is flexible but possesses high e strength. The cable 12d is preferably sheathed with a protective plastic sleeve and terminates with a pair of terminal eyelets 30d in a manner r to the embodiment shown in Figure 6.

The cable 12d is d at multiple points, preferably 4 points, intermediate its length, spaced from each other, by ble and adjustable eyelets 18d that are secured by fasteners 25 in the form of screws to a metal or wooden batten or rafter, or another suitable building t ure 23 d.

Spaced upon approximately halfway between two innermost slideable eyelets 18d is a shock absorber 13d covered across its tine shock absorbing section by a sleeve 14d. A first end of the shock absorber 13d is threaded by the cable 12d through a pair of slots 15d similar to the slots 150 shown in Figure 10. At its opposed end, a second attachment means 16d provides a loop for attachment of a carabiner 60d for the attachment of individual safety equipment.

In Fig; 12, the height safety anchor 11d of Fig. 11 is shown installed on a metal cladded roof 24.

The eyelets 18d are secured through pre~formed registered holes in the metal cladding 24 to a rafter support (not shown). The fasteners 25 are typically and preferentially inserted at a high ridge point in the cladding where possible to minimize the risk of corrosion and roof leakage.

Through a ner 60d, the height safety anchor 11d further has attached to its second attachment 16d a safety rope 62 to which a worker may be attached via their personal safety equipment, such as a harness (not shown).

It can be seen that not only does the shock absorber 13d e the potential for absorption of load to the second attachment 16d, but energy in the event of the application of a critical sudden the ability of the cable to slide against friction resistance and onal forces applied by the slideable eyelets 18d also provide a means for tion of kinetic energy applied through the second attachment.

It will appreciated that many modifications and variations may be made to the embodiment described herein by those skilled in the art without ing from the spirit or scope of the disclosure.

Throughout the specification and claims the word “comprise” and its derivatives are intended to have an inclusive rather than ive g unless the context requires otherwise.

In the present specification, terms such as “component”, atus”, “means”, “device” and “member” functions or may refer to singular or plural items and are terms intended to refer to a set of properties, characteristics performed by one or more items having one or more parts. It is envisaged that where a nent”, “apparatus”, ”, “device” or “member” or similar term is described as being a unitary object, then a functionally equivalent object having multiple components is considered to fall within the e” or scope ofthe term, and similarly, Where a “component”, “apparatus”, “assembly”, “means”, “member” is described as having multiple items, a functionally equivalent but unitary object is also considered to fall within the scope ofthe term, unless the contrary is expressly stated or the t requires otherwise.

INDUSTRIAL APPLICABILITY It will be immediately apparent to persons skilled in the art that the height safety anchor may provide an anchor point for a variety of activities carried out on buildings at height. For example, the height safety anchor may provide a anchor point for posts supporting fences or other barriers erected for the safety of workmen working on the ng or may be used to secure equipment associated With the actual work on the building, hstanding that its primary function is to provide safety for persons engaged on working on a building.

Key to Features and their References Height safety anchor 11 Webbing material 12 Stainless steel cable 12 First length of cable i Second length of cable 12mm Shock absorber 13 Rubber or latex sleeve 14 First Attachment End Slot of Shock Absorber 15 End plate 15a » Apertures 15’,15”,150,15d Second Attachment hole or large ring 16 Rope 62 Webbing is provided with six holes 17 Holes 17 are further provided with metal eyelets; piece metal eyelet configuration generally referenced l8 Slidable eyelets l8 Eyelet apertures 18’ Building structure 23 Region of conceitina~like bends 19 Crook 19’ between large ring 16a and first fold of concertinaed shock absorber 13a Two washers 20 Ferrule member 21 Flanges 22 Sheet ofmetal roof ng 24 Metal batten 23a Timber batten 23b Hex-headed roofing screws 25 Threaded n 26 of the screw 25 Pair of rafters 27 Tiles 28 Closed swage socket 30 End eyelet 31 Swage sleeve 32 Open swage socket 35 End eyelet 36 Swage sleeve 37 Slidable eyelet 40 End tabs 41 Holes 42 Central grove or channel 43 Grips or flats of second attachment 44 Carabiner 60d Safety rope 62

Claims (12)

Claims:

1. A height safety anchor for fitment to a building support structure, the height safety anchor comprising: a first attachment for fitment to the building support structure by engagement to a flexible and high tensile elongate member comprising a plurality of spaced eyelets that are slidable along the elongate member; a second attachment remote from the first attachment for attaching safety equipment; a shock absorber having a deformable region extending between the first and second attachment in a first length when not subject to a deformation force corresponding to a critical sudden load, the shock absorber lying substantially in a single plane and comprising a substantially rigid structure that, when subject to the al sudden load, s, elongating to a greater length than the first length.

The height safety anchor according to claim 1, wherein the elongate member is in the form of a cable.

The height safety anchor according to claim 2, wherein the le eyelets comprise a loop surrounding a n of the cable.

The height safety anchor according to claim 3, wherein loop is a sleeve formed from a plate pressed onto and around the cable.

The height safety anchor ing to any one of claims 1 to 4, wherein the cable is a metal cable.

The height safety anchor according to claim 5, wherein the height safety anchor r includes end sockets swaged onto the ends of the metal cable.

The height safety anchor according to any one of claims 1 to 6, wherein the shock absorber ses the first attachment which is in the form of a ring.

The height safety anchor according to claim 7, wherein the shock absorber ses a series of folded portions forming a concertinaed length one end of which connects to one side of the ring so that one section of the ring is positioned adjacent a straight edge of the last length of folded length of the series of folded portions.

The height safety anchor according to any one of claims 1 to 8, wherein the shock absorber engages the elongate member which is fed through a pair of spaced holes formed in an end plate of the shock absorber.

10. The height safety anchor according to any one of claims 6 to 9, wherein the end sockets comprise eyebolt bolts threaded into swaged end sleeves.

ll. The height safety anchor according to any one of claims 1 to 10, wherein the deformable region is formed so that when the deformation force is applied thereto, the deformation region unbends.

12., The height safety anchor according to any one of claims 1 to ll, n the critical sudden load is applied when a person attached to the second ment falls from a height. -, .‘; twra“ j;,.A :4?” "« -I- \ .mp3 q-.. F/Q IO