WO1994017261A1 - Improved roof anchor - Google Patents
Improved roof anchor Download PDFInfo
- Publication number
- WO1994017261A1 WO1994017261A1 PCT/GB1994/000149 GB9400149W WO9417261A1 WO 1994017261 A1 WO1994017261 A1 WO 1994017261A1 GB 9400149 W GB9400149 W GB 9400149W WO 9417261 A1 WO9417261 A1 WO 9417261A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- roof
- anchor
- truss
- roof anchor
- legs
- Prior art date
Links
- 230000000149 penetrating effect Effects 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 3
- 230000000295 complement effect Effects 0.000 abstract description 3
- 238000012856 packing Methods 0.000 description 8
- 239000010935 stainless steel Substances 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000010454 slate Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000587161 Gomphocarpus Species 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010875 treated wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04D—ROOF COVERINGS; SKY-LIGHTS; GUTTERS; ROOF-WORKING TOOLS
- E04D13/00—Special arrangements or devices in connection with roof coverings; Protection against birds; Roof drainage ; Sky-lights
- E04D13/12—Devices or arrangements allowing walking on the roof or in the gutter
-
- 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
-
- 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
-
- 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
-
- 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
- E04G5/00—Component parts or accessories for scaffolds
- E04G5/04—Means for fastening, supporting, or bracing scaffolds on or against building constructions
- E04G5/041—Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffolds on roof frameworks or on roofs
Definitions
- This invention relates to an improved roof anchor and in particular, but not exclusively, to an anchoring device for use on sloping roofs and to which a lanyard with a safety harness or anchorage line with safety harness or other similar device may be secured, or from which a roof ladder may be suspended.
- roof anchoring devices which are secured to various elements of a roof such as a truss or the ridge so that an anchoring element, usually an eyebolt, projects through the roof surface and to which a safety harness or the like may be secured. Examples of such devices are disclosed in GB A 2071196, GB A 2219826 and GB A 2251020.
- the roof anchor will typically have a portion which extends through a lead slate-piece, such as described and illustrated in GB A 2251020. It is important that the seal between the roof anchor and slate-piece is watertight and also that the formation of the seal does not damage the slate-piece.
- the arrangement disclosed in GB A 2251020 provides a seal by providing an arrangement of concave washers on either side of the slate-piece around the aperture in the slate-piece through which the eyebolt extends.
- the roof anchor assembly disclosed in GB A 2251020 comprises a relatively large number of parts requiring machining or forming.
- the anchorage clamp disclosed in GB A 2071196 is of simpler construction and is adapted for location on the ridge of a roof. However, the clamp does not include any provisions for forming a seal with a slate-piece or other roof covering, to prevent the ingress of moisture around the clamp.
- a roof anchor for use on a roof having a plurality of trusses with an external roof covering including a deformable member thereon
- the roof anchor comprising: a roof penetrating member having an attachment point and legs coupled to the attachment point for passing through the deformable member and passing down the sides of a truss, each leg of the roof penetrating member including a first surface for engaging an outer side of the deformable member around an aperture formed therein to accommodate the leg; an upper member for location beneath the deformable member and for transferring force applied to the attachment point of the roof penetrating member to an upper face of the truss, the upper member defining apertures to receive the legs of the roof penetrating member and providing mounting for respective second surfaces for engaging the inner side of the deformable member, the roof penetrating member and the upper member being adapted to provide a seal between the first and second surfaces around the apertures formed in the deformable member; and a lower member for engaging a lower face of the
- the roof penetrating member is generally U-shaped.
- the attachment point provided by the member may be suitable for securing a lanyard with a safety harness or anchorage line with safety harness, or may be in the form of a ladder hook.
- the attachment point may be formed of an eyelet disposed 90° to the legs of the U.
- the upper member is in the form of a plate.
- the lower member may also be in the form of a plate.
- the first and second surfaces are arranged so that the first and second surfaces engage the respective outer and inner sides of the deformable member so as to raise part of the deformable member near to the centre of said respective first and second surfaces above the part of the deformable member at the periphery of said first and second surfaces.
- the spacing between the second surfaces defined by the upper member and a lower face of the upper member for engaging an upper face of the truss or the upper surface of the roof sarking, where provided, is such that the portion of the deformable member extending beyond the second surfaces may be substantially planar. This permits the roof anchor to be fitted without creating a depression, where water will lie, in the deformable member.
- the upper member may be formed of a single part, or may be formed of a number of separable parts.
- the upper member may comprise a spacer member for engaging the truss or sarking and a plate which carries the second surfaces.
- the spacer member is formed of a block of preservative treated wood and the plate is formed of steel.
- the upper member conveniently comprises a metal plate for engaging the truss or sarking, the second surfaces being provided on the upper ends of bosses welded to the plate.
- the bosses should be of sufficient strength or suitably supported or reinforced to withstand forces of the magnitude which would be applied to the attachment point at the upper end of the roof penetrating member and thus to the bosses in the event of an operator attached to the anchor falling from the roof without significant deformation to the roof penetrating member or the bosses.
- the lower ends of the legs of the roof penetrating member are threaded so that nuts may be used to secure the lower member thereto and clamp the anchor to the truss.
- the first surfaces may be provided by washers or the like of suitable configuration mounted to the legs of the roof penetrating member.
- the second surfaces may be provided by washers secured to the upper surface of the upper member.
- Figure 1 is a perspective view of a roof anchor in accordance with a first embodiment of the present invention, shown mounted on a roof truss;
- FIG. 2 is a side view of the roof anchor of Figure 1, and showing further roof elements;
- Figure 3 is a view in the direction of arrow 3 of Figure 2, showing roof elements in section;
- Figure 4 is a perspective view of a roof anchor in accordance with a second embodiment of the present invention, shown mounted on a roof truss;
- Figure 5 is a side view of the roof anchor of Figure 4, and showing further roof elements;
- Figure 6 is a view in the direction of arrow 6 of Figure 5, showing roof elements in section;
- FIG. 7 is a perspective view of a roof anchor in accordance with a third embodiment of the present invention, shown on a roof truss, and
- Figure 8 is a perspective view of a roof anchor in accordance with a fourth embodiment of the invention.
- FIGS 1, 2 and 3 of the drawings illustrate a roof anchor 10 in accordance with a first embodiment of the present invention clamped to a roof truss 12.
- the anchor 10 is shown on a sloping portion of roof.
- the roof is of conventional construction with sarking 14 provided over the roof trusses 12 and counter battens and tile battens 16, 18 being provided to mount tiles 20 on the roof.
- sarking 14 provided over the roof trusses 12 and counter battens and tile battens 16, 18 being provided to mount tiles 20 on the roof.
- a tile has been removed and replaced with a lead slate-piece 22.
- the roof anchor 10 includes a stainless steel U-bolt 24, the upper end of which extends above the slate-piece 22 to provide an attachment point for a lanyard or safety harness.
- the legs of the U-bolt 26, 28 extend through the slate-piece and sarking 22, 14 and down the sides of the truss 12.
- the lower ends of the legs 26, 28 are threaded and extend through apertures provided in a lower plate 32.
- Nuts and washers 34 are provided on the threaded ends of the legs 26, 28 to clamp the plate 32 against a lower surface of the truss 12.
- Located on the upper surface of the sarking 14 and below the slate-piece 22 is an upper plate member in the form of a timber packing piece 36 and a metal plate 38.
- the packing piece and plate are nailed to the sarking and truss 14,12, the nail-heads 39 being seen in Figure 1.
- Both the packing piece and plate 36, 38 are apertured to accommodate the legs 26,28.
- Welded to the upper surface of the plate 36 are two convex surfaced washers 40,42 which engage the lower surface of the slate-piece 22.
- Complementary washers 44,46 are welded on the legs 26,28, the arrangement being such that the portions of the slate-piece around the apertures 45 (only one shown in Figure 2) which accommodate the legs 26,28 are clamped between the respective washers 40,44 and 42,46.
- each pair of washers raise the portion of the slate-piece 22 near to the respective aperture 45 above the part of the slate-piece at the periphery of the washers, and this arrangement assists in preventing the ingress of moisture through the apertures 45.
- the spacing of the washers 40,42 from the surface of the sarking 14 is controlled by the thickness of the packing piece and plate 36,38, such that the slate-piece 22 is substantially planar and thus fitting of the anchor does not create a water collecting depression around the apertures 45.
- the thickness of the packing piece 36 may be varied to suit particular applications.
- the relative dimensions of the U-bolt 24, plates 32, 38 and the packing piece 36 are selected according to the material used and to withstand forces of the magnitude which would be applied to the upper end of the U-bolt 24 in the event of an operator attached to the anchor falling from the roof without significant deformation. In the event of such a fall, the force applied to the upper end of the U-bolt 24 will be resisted by the upper plate 38 acting on the packing piece 36, which in turn acts on the sarking 14 and the upper face of the truss 12, and the lower plate 32 acting on the lower face of the truss 12.
- the location of the upper plate 38, spaced from the sarking and truss 14, 12, also minimises the length of U-bolt which is unsupported and thus reduces the bending moments, and subsequent possibility of deformation, to which the U-bolt is subject.
- the U-bolt 24, and washers 44, 46 are formed of stainless steel.
- the upper plate 38 and washer 40, 42 are conveniently of galvanised steel, and the packing piece 36 is formed of pressure or vacuum treated timber.
- the lower plate 32 will not be exposed to the same degree of weathering as the other parts of the anchor it may be formed of a less corrosion resistant steel.
- the above described roof anchor 10 may be fabricated from a minimal number of parts in a very short time, the only significant machining step involved being the formation of the threads on the U-bolt 24. Also, fitting the roof anchor 10 is a very straightforward procedure, and the fitted anchor presents a very low profile and thus is not visually intrusive. Further, such a roof anchor 10 may be constructed to conform with appropriate local standards, such as the British and European Standards, without requiring the use of unduly heavy sections or components.
- FIG. 4 illustrates a roof anchor 50 in accordance with a second embodiment of the present invention.
- Many of the features of the roof anchor 50 are similar to the features of the roof anchor 10 described above with reference to Figures 1, 2 and 3 and the same reference numerals are used to indicate these similar features.
- the difference between the two embodiments lies in the upper plate member 52 which, in this roof anchor 50, is in the form of a single, fabricated metal part.
- the plate 52 comprises a base plate 54 which lies on the sarking 14.
- Welded to the plate 54 are two bosses 56, 58 which provide mounting for the washers 40, 42.
- a stiffening spine 60 which increases the modulus of the plate 54.
- a flange 62 is welded to the upper surface of the spine 60 and also to the bosses 56, 58 to assist the bosses in resisting the bending moments which would be applied to the bosses in the event of forces being applied to the attachment point by an operator falling while secured to the anchor 50.
- FIG 7 of the drawings illustrates a roof anchor in accordance with a third embodiment of the present invention.
- the anchor is very similar to the first described embodiment, and the same reference numerals are used for similar parts.
- the U-bolt 124 is considerably longer and is bent above the slate-piece 22 to form a hook 126, suitable for mounting a ladder on the roof.
- the U-bolt 125 has a cross-bar 128 extending between the legs of the bolt, to provide a harness anchor. In the event of a fall, the cross-bar 128 spreads the load to both legs of the U-bolt 124, rather then having the shock load concentrated on one leg. If the anchor is to be used solely as a ladder hook, the cross-bar 128 may be omitted.
- Fig. 8 of the drawings depicts a roof anchor in accordance with a fourth embodiment of the present invention and in which like numerals refer to like parts but with the prefer '2' . This is substantially identical to that shown in Fig.
- the upper end of the stainless steel U-bolt 224 is sufficiently long so that it can be twisted through 90° as shown to create an eye which has a narrower profile than the other embodiments.
- This narrow profile is also aesthetic in that it minimises distraction from the roof which is particularly advantageous for use in conservation areas.
- This anchor is readily manufactured by cutting a rod of predetermined length and threading the ends with 3 /4" (7.5-10cm) of threads. The threaded rod is then bent to form a U. The legs of the U are then fixed in a mandrel and a former of suitable diameter is inserted at the base of the U which is then twisted through 180°.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP94905169A EP0681634B1 (en) | 1993-01-26 | 1994-01-26 | Improved roof anchor |
DE69403629T DE69403629T2 (en) | 1993-01-26 | 1994-01-26 | ANCHORING DEVICE FOR ROOFS |
AU58889/94A AU5888994A (en) | 1993-01-26 | 1994-01-26 | Improved roof anchor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB939301504A GB9301504D0 (en) | 1993-01-26 | 1993-01-26 | Improved roof anchor |
GB9301504.8 | 1993-01-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994017261A1 true WO1994017261A1 (en) | 1994-08-04 |
Family
ID=10729338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1994/000149 WO1994017261A1 (en) | 1993-01-26 | 1994-01-26 | Improved roof anchor |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0681634B1 (en) |
AU (1) | AU5888994A (en) |
DE (1) | DE69403629T2 (en) |
GB (1) | GB9301504D0 (en) |
WO (1) | WO1994017261A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999049154A1 (en) * | 1998-03-20 | 1999-09-30 | Gutter-Vac Bundaberg Pty. Ltd. | A roof safety system |
NL2000482C2 (en) * | 2007-02-08 | 2008-08-11 | Daktari V O F | Safety coupling to be fitted on a roof. |
US9878187B2 (en) | 2015-12-04 | 2018-01-30 | Rooftop Anchor, Inc. | Joist anchor |
FR3055644A1 (en) * | 2016-09-06 | 2018-03-09 | Etablissements Frenehard Et Michaux | DEVICE FOR FIXING A SECURITY ANCHORING DEVICE ON A COVER OF A ROOF OF A BUILDING |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2166691A5 (en) * | 1972-01-04 | 1973-08-17 | Creusot Loire | |
DE3441398A1 (en) * | 1984-11-13 | 1986-05-22 | Erhard 6900 Heidelberg Lamberti | Roof safety hook |
EP0276708A1 (en) * | 1987-01-27 | 1988-08-03 | The Firestone Tire & Rubber Company | Mechanical roof fastener |
US5011106A (en) * | 1990-03-27 | 1991-04-30 | Stanford Cody Limited | Roof safety anchor |
GB2251020A (en) * | 1990-12-08 | 1992-06-24 | Henry Crawford | Improved roof anchor |
GB2259527A (en) * | 1991-09-14 | 1993-03-17 | Henry Crawford | Roof penetrating device with water seal |
-
1993
- 1993-01-26 GB GB939301504A patent/GB9301504D0/en active Pending
-
1994
- 1994-01-26 EP EP94905169A patent/EP0681634B1/en not_active Expired - Lifetime
- 1994-01-26 WO PCT/GB1994/000149 patent/WO1994017261A1/en active IP Right Grant
- 1994-01-26 AU AU58889/94A patent/AU5888994A/en not_active Abandoned
- 1994-01-26 DE DE69403629T patent/DE69403629T2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2166691A5 (en) * | 1972-01-04 | 1973-08-17 | Creusot Loire | |
DE3441398A1 (en) * | 1984-11-13 | 1986-05-22 | Erhard 6900 Heidelberg Lamberti | Roof safety hook |
EP0276708A1 (en) * | 1987-01-27 | 1988-08-03 | The Firestone Tire & Rubber Company | Mechanical roof fastener |
US5011106A (en) * | 1990-03-27 | 1991-04-30 | Stanford Cody Limited | Roof safety anchor |
GB2251020A (en) * | 1990-12-08 | 1992-06-24 | Henry Crawford | Improved roof anchor |
GB2259527A (en) * | 1991-09-14 | 1993-03-17 | Henry Crawford | Roof penetrating device with water seal |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999049154A1 (en) * | 1998-03-20 | 1999-09-30 | Gutter-Vac Bundaberg Pty. Ltd. | A roof safety system |
NL2000482C2 (en) * | 2007-02-08 | 2008-08-11 | Daktari V O F | Safety coupling to be fitted on a roof. |
EP1956163A2 (en) | 2007-02-08 | 2008-08-13 | Daktari V.O.F. | Safety attachment to be fitted on a roof |
US9878187B2 (en) | 2015-12-04 | 2018-01-30 | Rooftop Anchor, Inc. | Joist anchor |
FR3055644A1 (en) * | 2016-09-06 | 2018-03-09 | Etablissements Frenehard Et Michaux | DEVICE FOR FIXING A SECURITY ANCHORING DEVICE ON A COVER OF A ROOF OF A BUILDING |
Also Published As
Publication number | Publication date |
---|---|
DE69403629T2 (en) | 1998-01-22 |
EP0681634A1 (en) | 1995-11-15 |
EP0681634B1 (en) | 1997-06-04 |
AU5888994A (en) | 1994-08-15 |
GB9301504D0 (en) | 1993-03-17 |
DE69403629D1 (en) | 1997-07-10 |
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