NZ602265B - Temporary roof anchor having shock absorbing means - Google Patents
Temporary roof anchor having shock absorbing means Download PDFInfo
- Publication number
- NZ602265B NZ602265B NZ602265A NZ60226512A NZ602265B NZ 602265 B NZ602265 B NZ 602265B NZ 602265 A NZ602265 A NZ 602265A NZ 60226512 A NZ60226512 A NZ 60226512A NZ 602265 B NZ602265 B NZ 602265B
- Authority
- NZ
- New Zealand
- Prior art keywords
- anchor
- temporary
- roof
- roof anchor
- temporary roof
- Prior art date
Links
- 230000035939 shock Effects 0.000 title claims abstract description 31
- 230000000875 corresponding Effects 0.000 claims abstract 3
- 239000002184 metal Substances 0.000 claims description 46
- 239000006096 absorbing agent Substances 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 5
- 239000002965 rope Substances 0.000 claims description 5
- 230000001419 dependent Effects 0.000 claims 2
- WYTGDNHDOZPMIW-UHOFOFEASA-O Serpentine Natural products O=C(OC)C=1[C@@H]2[C@@H]([C@@H](C)OC=1)C[n+]1c(c3[nH]c4c(c3cc1)cccc4)C2 WYTGDNHDOZPMIW-UHOFOFEASA-O 0.000 abstract 2
- 238000005253 cladding Methods 0.000 description 27
- 239000000463 material Substances 0.000 description 16
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 206010022114 Injury Diseases 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 230000003467 diminishing Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 230000004301 light adaptation Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 210000003414 Extremities Anatomy 0.000 description 1
- 241000229754 Iva xanthiifolia Species 0.000 description 1
- 229920000126 Latex Polymers 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 210000000162 Simple eye Anatomy 0.000 description 1
- 229940035295 Ting Drugs 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000003014 reinforcing Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
- A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/32—Safety or protective measures for persons during the construction of buildings
- E04G21/3261—Safety-nets; Safety mattresses; Arrangements on buildings for connecting safety-lines
- E04G21/3276—Arrangements on buildings for connecting safety-lines
- E04G21/329—Arrangements on buildings for connecting safety-lines with measures for dampening the fall
Abstract
602265 Disclosed is a temporary roof safety anchor for preventing injuries from falls that has a serpentine plastic deforming shock absorbing anchor secured by flexible webbing straps fixed to the roof. The temporary roof anchor 11 for fitment to a roof support structure 23b comprises a first flexible attachment means 15 for temporary fitment to the roof support structure; second flexible attachment means 16 remote from the first attachment means for attaching safety equipment; and shock absorbing means 13 having a plastically deformable 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 structure that, when subject to the critical sudden load, deforms, elongating to a greater length than the first length. ble attachment means 15 for temporary fitment to the roof support structure; second flexible attachment means 16 remote from the first attachment means for attaching safety equipment; and shock absorbing means 13 having a plastically deformable 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 structure that, when subject to the critical sudden load, deforms, elongating to a greater length than the first length.
Description
COMPLETE SPECIFICATION
TEMPORARY ROOF ANCHOR HAVING SHOCK-ABSORBING MEANS
TECHNICAL FIELD
The application relates to a temporary roof anchor for attaching devices, apparatus or equipment
to a roof surface and, more particularly, to a roof anchor for temporary fitment to a roof structure
clad with metal sheeting, the roof anchor also including shock absorbing means. The devices,
apparatus or ent to be attached may include safety equipment such as safety harnesses,
ropes or other safety devices adapted to secure a roof worker against falling and injury.
Whilst the invention derives particular advantage when used in ction 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
ing description.
BACKGROUND ART
Several solutions have been proposed for providing anchor points on a roof, but these are
normally intended for permanent . Such anchor points are made available so that a person
working on the roof, for example, can attach himself to 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 roof.
Thus, conventional roof anchoring devices for permanent fitment require access to the roof
support structure such as a batten or . Direct access to the support structure is lly
required and involves mounting the roof anchor prior to the application of the external covering
of the roof such as tiles, g, sheeting or other cladding so that upon application of the
external ng to the support structure, the roof anchor extends beyond the external covering.
The anchor will, of course, need to be suitably flashed to provide a weather-proofed .
On the other hand, if the al covering has already been applied to the roof 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 roof 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. Furthermore, there is also a risk
that damage to the covering may occur or, more particularly, once it is re—laid, the covering
might not ly seal against the ts.
r, 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 permanent anchor point by using a tool h an access ty, i.e., a relatively
small opening, for example, which is then later sealed.
In any event, all of the foregoing solutions have as their basic premise that the anchor is left
ently 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 permanent anchors are utilized.
To this end, a solution that provides for a temporary anchor point, ally one that could be
fitted to a metal roof and removed 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 rafters 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 replacing 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, ,
into the supporting structure below. Upon completion of the work, the screws can then be
removed again, the ary 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 ure 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 d.
This would provide a simple, useful and economic solution to the problem of providing a
temporary anchor point for safety equipment and the like, which could then be readily removed
once the work was ted. The temporary anchor could then be used at another location on
the same site or taken away altogether and used on another site.
Of course, such a solution would still need to be effective in ensuring adequate safety standards
are met, that is to say, the anchor itself, in conjunction with its , would need to meet the
necessary safety standards. It should be stressed that s that have hitherto been suitable for
permanent fitment do not lend themselves to attachment as temporary anchors in this way.
It would, therefore, be advantageous if such a temporary anchor were not only to meet the
desired safety standards, but that it were itself designed to be portable so that it could be easily
taken from one work site to another.
Thus, in summary, it would be advantageous if a temporary roof anchor were available that
could be affixed ly to a supporting roof structure for a metal clad roof, by affixing the
anchor through the metal ng at points already utilized for screwing the cladding to the
structure, without otherwise disturbing the metal cladding itself.
It would also be further advantageous if such a roof 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 if the anchor point were multi-directional
to the extent that it worked efficiently no matter from which direction forces might be d 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 structure where
applicable.
OBJECT OF ION
It is therefore an object of the present invention to e a temporary rood anchor especially
for metal clad roofs which ameliorates one or more of the aforementioned disadvantages
associated with the prior art, particularly by providing a ary 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 progressively absorb the s 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
temporary 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, whether metal or otherwise, is also meant to encompass
reference to any structure, Where, by le adaptation, the device may also be ed.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a temporary roof anchor for fitment to a
roof support structure or the like, especially a roof support structure having metal ng
affixed thereto, wherein the temporary anchor is provided with a first attachment means for
temporary fitment of the roof anchor to the roof support structure, a second attachment means
remote therefrom for attaching devices, apparatus or equipment, especially safety equipment,
thereto, and shock-absorbing means located therebetween so as to ssively distort under
sudden load, and wherein the first attachment means comprises a webbing material having a
plurality of spaced apart fixing points by means of 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 material cut or otherwise
formed so that when a force is applied thereto, there is d a deformation n in the form
of a generally linear extension of that portion, i.e., by effectively straightening or “unbending”
such region. Thus, the anchor is so ed that ation by bending, i.e., unbending or
straightening, of the shock—absorbing region, in combination with either of the attachment
regions as described herein, where appropriate, provides an absorption of the forces applied 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 e a
le shock-absorbing means against, for example, a sudden load arising from a person
attached thereto g from the roof.
With advantage, the shock ing means in the form bed may be covered with a rubber
sleeve or similar covering to protect it.
This sleeve may also provide a region Where safety ctions 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 ed may include safety equipment such as safety
harnesses, ropes or other safety devices adapted to secure a roof worker against g and
injury. While the devices, apparatus or equipment derives 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 tion is implied by a primary
reference to metal roofs in the ing description.
gh any suitable attachment means may be utilized to affix safety equipment and the like,
ably, the second attachment means by which the safety equipment such as a harness, etc.,
is attached to the shock-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.
Preferably, the webbing material providing the attachment means for affixing the anchor to the
roof structure is a polyester webbing capable of supporting a high e load, for example, in
excess of 10 tonnes. While polyester webbing is the preferred material, any webbing al,
including nylon and/or composites, having the ability to Withstand similar loads may be
employed.
Preferably, the webbing is a single length of webbing 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 le length is around 1.5 to 2 m in length, ably about 1.8
meters. With advantage, this length of webbing can be inserted through a slot provided in the
end of the shock-absorbing means remote from the end having the means to attach the safety
devices, etc., o. In this way, the webbing may extend for approximately equal lengths
either side of the 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 temporary anchor to function effectively in all directions.
ably, the fixing points in the webbing are holes, more preferably, reinforced holes, formed
in the webbing.
The preferred method of attaching the webbing to the roof structure will be 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 the webbing is
attached to the roof.
Preferably six such holes are 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 shock-absorbing means fail, sive screws will then
take up the load, causing a diminishing of the forces as the fall progresses. While six holes has
been 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 absorbing means. In its simplest form, of course, even
one hole may suffice where the length of g is, for example, simply looped back on itself
and . 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 preferred e at least four holes and, more preferably,
at least six, where a single length of webbing is passed h a slit in the end of the
shock-absorbing means as described above.
While it is preferred 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 additional safety should
the first screws adjacent the shock absorber fail. To e added safety, six, rather than merely
four screws, are recommended.
With advantage the holes in the webbing are provided with metal reinforcements in the form of
metal eyelets formed through the web. It is red 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 al in the webbing, for example. In any
event, the metal eyelets then provide suitable reinforcement for such holesthrough which screws
may be fitted, the screws then passing through the original holes in the metal cladding and into
the support structure. The metal eyelets t the webbing when inserting the screws and
provide a reinforcement so the head of the screw is constrained fi‘om passing through the
webbing, either during insertion of the screw or uently, should the temporary 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 extends
through the hole and is pressed over, i.e., crimped or expanded over, the female portion on the
other side, g a flange after the tubular portion passes through the hole in the female
portion.
However, as the g required for the ion is of necessity one having a very robust
construction, conventional eyelets have been found to be inadequate, generally inadequate
ally where relatively thick webbing material is utilized, e.g., greater than about 3 mm in
thickness. Again, however, where suitable compensation is otherwise 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
mm, a simple alternative has been developed that involves the use of a three—part eyelet
ly, comprising two identical s placed either side of the hole with a ferrule passing
therethrough, each end of which is then caused to be pressed over both s, 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 of the
eyelet structure.
With advantage, this eyelet, ing to the invention, can be inserted in such heavy webbing
material by having a series of spikes mounted along a ting member, over which the
webbing 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 squeezes 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, ng an ive 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 temporary anchor, the screws that hold the metal cladding are simply
removed, the temporary anchor located in position and then held in place utilizing those or other
screws if necessary, by inserting the screws through the holes in the g, then g
through the original holes in the metal cladding and thence into the supporting structure,
generally a batten. Once the work is completed, the screws may then be removed again, the
temporary anchor taken away and the screws d to hold the metal cladding in the way it was
originally found.
It is, of course, necessary that the screws hold the temporary anchor firmly and to this extent, a
different length of screw (albeit with the same gauge) may need to be utilized to ensure proper
penetration into the underlying batten. In the case of a timber batten, 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 engages properly with the batten to avoid so-called ssing of
the 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 ed, either by affixing to the
underlying roof ure through existing holes or even to the roof sheeting itself, provided the
fixing of the sheeting to the underlying structure is ently 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 le adaptation, other fixing means that allow the webbing to
be attached to such sheeting are, therefore, meant to be within the scope of the invention.
By utilizing a webbing material, having as its major advantage complete flexibility, it will be
understood that a variety of metal cladding profiles may thus be accommodated, the excess
al between each fixing point, i.e., hole, simply allowed to form a loop between each fixing
point. In other words, the use of g material allows for simple adjustment to accommodate
different profiles of metal cladding and different spacings of screws placed therein, while still
providing adequate support for the temporary anchor if subjected to a sudden load.
Alternatively, where the roof support structure supports other than metal cladding, the webbing
al may be affixed instead ly to the roof support 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 batten. Therefore, although primarily
intended for use with a metal roof, the temporary anchor, according to the invention, could be
fitted to a tiled roof or any other suitable stable structure, by attaching directly to the supporting
structure, such as a rafter or , after removing one or more tiles as necessary to gain access
to the underlying supp01t structure.
ably, the webbing and the way in which it is affixed to the roof t structure and/or the
roof cladding as described herein, co—operate with the shock-absorbing means to r assist in
minimizing the forces enced should a fall occur.
It Will be understood from the embodiments described herein, that the design as described herein
is able to function, irrespective of the direction of the load.
BRIEF DESCRIPTION OF THE DRAWINGS
The ion will be better understood from the following miting 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
invention;
is a plan view of a suitable energy-absorbing shock er 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; and
is a simple plan view of a temporary roof anchor shown in attached to the rafters
of a tiled roof after removal of tiles:
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
Referring generally to there is shown a roof anchor lly referenced 11 according to
one embodiment. The roof anchor 11 comprises a g material 12 and a shock er 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
g 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 the
, rather than cutting a hole in the webbing 12 itself, which would weaken the webbing 12 at
that point. These holes 17 are further provided with metal eyelets generally referenced 18 to
provide reinforcement. 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, e.g., 3 mm thick, die out to e the entioned 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. Therebetween is a region of concertina-like bends,
generally referenced 19, formed by die cutting. Upon experiencing a sudden load, such as would
occur when a person attached to the ary roof anchor 11 of which this shock absorber 13 is
a part, the shock absorber 13 is caused to extend by, as it were, “unbending,” i.e., concertina
region 19 straightening out. This action provides for a cushioning of the 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 ses two washers 20, which
are caused to be pressed against either side of a hole 17 extending through a portion of webbing
material 12 as described above. A ferrule member 21 is located through the hole 17 in the
webbing 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 of the 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, e.g., when
inserting a screw n (as shown in FIGS. 4 and 5), and, furthermore, also maintains the
integrity of the webbing 12 in use so that it will not pull away from the head of the screw once
fitted to a roofing ure.
Referring then to there is shown schematically a temporary anchor 11 as described in
FIGS. 2 h 3, attached to a roofing 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 red 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 23a, it is ary to
ensure that the threaded portion 26 of the screw 25 engages in the hole of the batten 23a without
over extending as bed 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 of the same gauge
but of an appropriate length as described have been used.
The length of webbing 12 is allowed to simply “buckle up” or concertina along its length
between tive screw attachment points.
With reference 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 instance, 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
energy absorption Will be initially taken up by the shock absorber 13 as it “unbends” as described
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 e.
Should the temporary anchor 11 be used in a fall, then it should be discarded. ise, 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 locations to once again secure the roof, or in
the case of the tile roof shown in the tiles placed back in position.
It will appreciated that many modifications and variations may be made to the embodiment
described herein by those skilled in the art t departing 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 exclusive meaning unless the context requires otherwise.
INDUSTRIAL APPLICABILITY
It will be immediately apparent to persons skilled in the art that the ary roof anchor
provide an anchor point for a variety of activities carried out on roofs. For example, the roof
anchor may provide a temporary anchor point for posts supporting fences or other barriers
erected for the safety of n working on the roof or may be used to secure equipment
associated with the actual work on the roof, notwithstanding that its primary function is to
provide safety for persons d on working on a roof.
Claims (16)
1. A temporary roof anchor for fitting to a roof support structure, the temporary roof anchor sing: first flexible ment for temporary fitment to the roof support structure at a plurality of fixing points; second ment remote from the first attachment means for attaching safety equipment; and shock-absorbing means having a deformable region extending between the first and second attachment means.
2. The ary roof anchor of claim 1, wherein the defonnable region comprises a tinaed arrangement formed so that when a critical sudden load is applied thereto, the deformation region unbends.
3. The temporary roof anchor of claim 1 or 2, wherein the deformation region is d with a sleeve to protect it in normal use until subject to the critical sudden load.
4. The temporary roof anchor of any one of claims 1 to 3, wherein the first attachment comprises a flexible webbing.
5. The temporary roof anchor of any one of claims 1 to 4, wherein the second attachment means is for attachment of a safety harness, rope or another safety device.
6. The temporary roof anchor of claim 5, wherein the second attachment means comprises an eye for ment of safety equipment thereto.
7. The temporary roof anchor according to any one of Claims 1 to 6, wherein the deformable region extends between the first and second attachments at a first length when the shock absorber is not subject to a deformation force corresponding to a critical sudden load, the shock absorber lies substantially in a single plane and comprises a substantially rigid but deformable structure that, when t to a critical sudden load, deforms, elongating to a length greater than the first length.
8. The temporary roof anchor of any one of claims 1 to 7, wherein the first flexible attachment includes a plurality of eyes.
9. The temporary roof anchor of claim 8, wherein the eyes are metal eyelets.
10. The temporary roof anchor of claim 8 or 9, wherein the eyes are adapted to be affixed to existing spaced fixing points in a roof structure of a building.
11. The temporary roof anchor of any one of claims 8 to 10 when dependent on any one of claims 4 to 7, wherein each eye of the plurality of eyes is formed by separating the fibers of the webbing, not by cutting the g fibers.
12. The temporary roof anchor of any one of claims 8 to 11 when dependent on any one of claims 4 to 7, wherein each eye is one hole of a plurality of holes and is reinforced by a metal eyelet assembly.
13. The temporary roof anchor of any one of claims 4 to 12, wherein the webbing is ed through a slot in an end of the shock absorber remote from the second attachment.
14. The temporary roof anchor any one of claims 1 to 13, wherein the shock absorber is formed from a single metal sheet.
15. The temporary roof anchor any one of claims 1 to 14, wherein the shock absorber is cut to form a region of concertina-like bends.
16. The ary roof anchor of any one of claims 1 to 13, n the shock absorber comprises a planar metal piece die cut from a single sheet and comprising a ity of concertina—like bends extending between the first and the second attachments and lying in the plane of the single sheet, the shock absorber d to unbend on application of a critical sudden load.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/322,770 US9227094B2 (en) | 2011-09-05 | 2014-07-02 | Height safety anchor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2011903582 | 2011-09-05 | ||
AU2011903582A AU2011903582A0 (en) | 2011-09-05 | Temporary roof anchor having shock absorbing means |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ602265A NZ602265A (en) | 2014-03-28 |
NZ602265B true NZ602265B (en) | 2014-07-01 |
Family
ID=
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU2012216652B2 (en) | Temporary roof anchor having shock absorbing means | |
US9316008B2 (en) | Roof anchor with shock absorbing means | |
US6966531B2 (en) | Roof anchors | |
AU2016257768B2 (en) | An anchor | |
US9227094B2 (en) | Height safety anchor | |
US7665248B2 (en) | Roof anchor | |
US20140224579A1 (en) | Fall protection system | |
WO2007081668A1 (en) | Slidable beam anchor | |
US9784003B2 (en) | Band spacing in fall protection system | |
CA2509425A1 (en) | Alien fall arrest safety system | |
AU2014203632B2 (en) | Height Safety Anchor | |
NZ602265B (en) | Temporary roof anchor having shock absorbing means | |
NZ590186A (en) | A portable roof anchor screwed to roof though ridges having an energy absorber connected to a harness | |
AU2009210368B2 (en) | Roof anchor cable system having shock absorbing means | |
AU2013100441A4 (en) | Roof Anchor Cable System Having Shock Absorbing Means | |
NZ627015B (en) | Height Safety Anchor | |
AU2013100771A4 (en) | Roof Anchor With Planar Shock Absorbing Means | |
EP2520740A1 (en) | A fall protection hooking device and related fall protection system | |
KR20030023928A (en) | Construction method and facility of protection against falling rocks | |
WO2013124288A2 (en) | Safety anchor | |
CZ25188U1 (en) | Anchorage device | |
NZ553425A (en) | A safety anchor |