AU2013100186A4 - Guy Bracket - Google Patents

Guy Bracket Download PDF

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Publication number
AU2013100186A4
AU2013100186A4 AU2013100186A AU2013100186A AU2013100186A4 AU 2013100186 A4 AU2013100186 A4 AU 2013100186A4 AU 2013100186 A AU2013100186 A AU 2013100186A AU 2013100186 A AU2013100186 A AU 2013100186A AU 2013100186 A4 AU2013100186 A4 AU 2013100186A4
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AU
Australia
Prior art keywords
hole
guy
bracket
diameter
face
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Expired
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AU2013100186A
Inventor
Andrew Geddes Bain Hunt
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HUNT SOLUTIONS WA Pty Ltd
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HUNT SOLUTIONS WA Pty Ltd
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Priority to AU2013100186A priority Critical patent/AU2013100186A4/en
Application granted granted Critical
Publication of AU2013100186A4 publication Critical patent/AU2013100186A4/en
Anticipated expiration legal-status Critical
Expired legal-status Critical Current

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Abstract

A guy bracket 10 comprises a member 11 having a first face 14 and a second opposite face 16. First and second holes 18 and 20 respectively are formed in the member 11 and open at their 5 respective opposite ends on each of the faces 14 and 16. Each of the ends 22a and 22b of the first hole 18 is chamfered so as to have a maximum diameter at the faces 14 and 16 respectively. The second hole 20 is chamfered at an end 24a so as to have a maximum diameter at the first face 14. A reflex angle E between 10 respective planes containing the diameters of the first and second holes 18, 20 is in the range of 2000 and 2500. A free end 33 of the bracket 10 near the first hole 18 is convexly curved between opposite sides of the plate. Also the opposite edges 37 of the free end 33 are chamfered or rounded. 4087169_1 (GHMatters) P92644.AU 20/02/13 - u-F 0" (N1

Description

- 1 Guy Bracket Technical Field A guy bracket is disclosed. A guy bracket may be used to facilitate the connection of a guy wire to a tall structure such 5 as a post or mast. Background of the art It is known to use one or more guy wires or guy ropes (hereinafter referred to as a "guy" in a singular or "guys" in a 10 plural) to support or otherwise stabilise tall structures such as masts and posts. One relatively common application for guys is to stabilise upright structures such as power poles, telegraph poles, masts and the like. In one example one end of the guy can be attached to an eye bolt fixed to a power pole. 15 The opposite end of the guy is attached to a ground anchor or peg often by via a turn buckle or other device enabling adjustment of tension in the guy. The eye bolt is provided with a shaft of sufficient length to pass through the transverse thickness of the pole. An eye in the form of a closed ring is 20 welded to one end of the shaft. Depending on the overall length of the shaft and the thickness of the pole, the eye may either abut the pole or be spaced some distance from a surface of the pole. The eye bolt is retained in the pole by use of one or more nuts threaded onto an opposite end of the shaft preventing 25 the shaft from being pulled through the hole in the pole. One end of the guy wire is threaded through the eye and retained in engagement with the eye by type of termination such as a clamp or swaged ferrule. 30 Eye bolts are prone to bending particularly at or adjacent the weld attaching the eye to the shaft of the bolt. This may lead to failure of the eye bolt and thus a decoupling of an associated pole or other tall structure with the guy. It is also known for the shaft of the bolt to cut through or otherwise 35 split the pole in response to the tension applied via the guy. 4087169_1 (GHMatters) P92644.AU 20/02/13 - 2 The above description of the background art is not intended to limit the application of the guy bracket disclosed herein. Summary of the disclosure 5 In a first aspect there is disclosed a guy bracket comprising a member provided with a first face, a second opposite face, and first and second spaced apart through holes, each through hole opening at opposite ends on to each of the first and second faces wherein opposite ends of the first hole are chamfered to a 10 maximum diameter at the first and second faces, and at least an end of the second hole that opens on to the first face is chamfered to a maximum diameter, the first hole configured to enable a guy coupling device to engage and move with respect to the first hole. 15 In one embodiment the member comprises a free end near the first hole, the free end being of acruate configuration in a plane lying parallel to a diameter of the first hole. In one example the free end is convexly curved between opposite sides of the 20 plate. This may be realized by forming the free end to have a center of curvature common with a center of the first hole. Opposite edges of the free end may be chamfered or rounded. In one embodiment the member is configured to form a reflex 25 angle in the range of 2000 and 2500 between a plane containing a diameter of the first hole and a plane containing a diameter of the second hole. In other embodiments the reflex angle may comprise any range of angles between 2000 and 2500. For example in one embodiment the reflex angle may be between 2150 and 2350. 30 In a further embodiment the reflex angle may be about 2250. The general idea here is that when the bracket is fixed to a support in the form of an upright structure such as a pole, with a fixing passing through the first hole and the into the pole, and the second face adjacent the pole, the diameter of the second 35 hole is inclined of at an angle of 2700 minus the reflex angle to the vertical. So when the reflex angle is 2250 the diameter 4087169_1 (GHMatters) P92644.AU 20/02/13 - 3 of the second hole is inclined at 450 to the vertical. In one embodiment the member may comprise a plate of substantially uniform thickness having first and second portions 5 wherein the first hole is in the first portion and the second hole is in the second portion. Here the reflex angle may also be measured or taken a between is between the second face of the first and second portion. As a corollary of this then it will be understood that when the member is a plate then an included on 10 the side of the first face between the first and second protons is 3600 minus the reflex angle. In one embodiment the chamfer on the second hole is arranged so that the ends of the second hole increase in diameter at an 15 angle of between 30 and 600. The angle of the chamfer may also comprise any range of angles between 30 and 600. For example in one embodiment the angle of the chamfer may be 450. In one embodiment the chamfer of the second hole is configured 20 so that the diameter of the second hole increases by about 1-3mm from a maximum to a minimum diameter end of the chamfer. In one embodiment the second hole is a constant diameter portion of about 25mm. In one embodiment the chamfer of the first hole 25 is angled at between 30'-60'. Further, the angle of the chamfer may fall within any range in between 30'-60'. In one example the angle of the chamfer of a first hole may be 450. In a second aspect there is disclosed a method of stabilising an 30 upright structure with a guy the methods comprising fixing a bracket in accordance with the first aspect to the upright structure with a mechanical fastener passing through the second hole and engaging with the upright structure, coupling one end of a guy with the first hole. The guy may be coupled to with the 35 first hole via a thimble which passes through and engages the first hole. 4087169_1 (GHMatters) P92644.AU 20/02/13 In one embodiment the method comprises coupling a second opposite end of the guy to an anchor in a manner wherein the guy extends from the bracket to the anchor substantially in line with the angle of the plane containing a diameter of the first 5 hole. Brief description of the drawings Notwithstanding any other forms which may fall within the scope of the guy bracket as set forth in the Summary, a specific 10 embodiment will now be described by way of example only with reference to the accompanying drawings in which: Figure 1 is an isometric representation of an embodiment of the guy bracket; 15 Figure 2 is a front elevation view of the bracket shown in figure 1; Figure 3 is a side view of the bracket shown in figure 1; Figure 4 is a rear elevation view of the bracket shown in figure 1; 20 Figure 5a is a schematic representation of an embodiment of the bracket in use coupled to a pole and with a guy extending between the bracket and a ground anchor; Figure 5b is a view of detail A of Figure 5a; Figure 5c is a view of detail B of Figure 5a; and 25 Figure 6 is a schematic representation of a second embodiment of the guy bracket. Detailed description of the preferred embodiment With reference to the accompanying drawings an embodiment of the 30 guy bracket 10 comprises a member 11 which is exemplified by a plate 12 having a first face 14 and a second opposite face 16. First and second holes 18 and 20 respectively are formed in the plate 12 and open at their respective opposite ends on each of the faces 14 and 16. Specifically, the first hole 18 has one 35 end 22a that opens on to the first face 14, and an opposite end 22b that opens on to the second face 16. Likewise, the second 4087169_1 (GHMatters) P92644.AU 20/02/13 - 5 hole 20 has one end 24a that opens onto the first face 14 and an opposite end 24b that opens onto the second face 16. Each of the ends 22a and 22b of the first hole 18 is chamfered so as to have a maximum diameter at the faces 14 and 16 respectively. 5 The second hole 20 is chamfered at the end 24a so as to have a maximum diameter at the first face 14. The first hole is configured to enable a guy coupling device such as but not limited to a thimble 26 to engage and move with respect to the first hole 18. As depicted in Figure 5, the thimble 26 is used 10 to facilitate attachment of one end of a guy 50 to the bracket 10. The plate 12 can be considered to notionally comprise a first portion 30 in which the first hole 18 is formed and a contiguous 15 second portion 32 in which the second hole 20 is formed. In this embodiment the portions 30 and 32 are contiguous by way of being formed integrally during manufacturing of the plate 12. The portions 30 and 32 are angled relative to each other at a reflex angle E on the second face 16. More particularly it will 20 be noted that the reflex angle E coincides with the angle between respective planes containing the diameters of the first and second holes. The reflex angle E is in the range of 2000 and 2500. In other embodiments the reflex angle E may comprise any range of angles between 2000 and 2500. For example in one 25 embodiment the reflex angle E may be between 2150 and 2350. In a further embodiment the reflex angle may be about 2250. The general idea here, with particular reference to Figure 5, is that when the bracket 10 is fixed to a support in the form of an 30 upright structure such as a pole 42, with a fixing passing through the second hole 20 and the into the pole, and the second face 16 adjacent the pole, the diameter of the first hole is inclined of at an angle of 2700 minus the reflex angle E to the vertical. So when the reflex angle is 2250 the diameter of the 35 first hole 18 is inclined at 450 to the vertical. The included angle between respective planes containing the 4087169_1 (GHMatters) P92644.AU 20/02/13 - 6 diameters of the holes 18 and 20 is 360'- E. Thus for example when e=225' then P=135. The portions 30 and 32 lie on opposite sides of a bend radius 34 5 (see Figure 3) of the plate 12. The first portion 30 has a length L1 reference to the bend radius 34 while the second portion 32 has a length L2 reference to the bend radius 34. In this particular embodiment the L1 is lightly greater than L2. In one example L1 may be 60mm and L2 may be 55mm. The 10 difference between L1 and L2 in this particular embodiment arises as the hole 18 has a greater diameter than the hole 20. Therefore by forming the first portion with the greater length L1 it is possible to locate the hole 18 in the position that provides a general uniform thickness of material between the 15 inner diameter of the hole 18 and a free end 33 of the portion 30. The free end 33 is of acruate configuration in a plane lying parallel to a diameter of the first hole. Specifically the free 20 end is convexly curved between opposite sides of the plate. Thus an outer surface 35 of the free end 33 is smoothly curved. This may be realized by forming the free end 33 to have a center of curvature common with a center of the first hole 18. Also the opposite edges 37 of the free end may be chamfered or rounded. 25 Looking more specifically at the hole 18 it will be seen that this hole has a constant diameter portion Dla which extends for a majority of the axial length of the hole 18, and a maximum diameter Dib each of ends 22a and 22b. The increase in diameter 30 form Dla to Dib creates the chamfer at each of the ends 22a and 22b. The difference between the diameters Dla and Dib may be between 1mm and 3mm. In one specific example the difference between Dla and Dib is 2mm. Thus for example if Dla is 32mm then Dib is 34mm. The chamfer is inclined at an angle a of 35 between 30 and 60'. However in this specific embodiment the angle a is 45'. 4087169_1 (GHMatters) P92644.AU 20/02/13 - 7 The hole 20 has a portion of constant diameter D2a which increases to a maximum diameter D2b at the end 24a. The hole 20 in this embodiment is chamfered only at the end 24a and not at the end 24b. However in an alternate embodiment, the hole 20 5 may be chamfered on both ends 24a and 24b. The chamfer of the hole 20 results in the hole having a minimum diameter D2a and a maximum diameter D2b. The hole 20 is of diameter D2a for a majority of its length and in particular from 10 the second face 16 up to the commencement of the chamfer near the first face 14. The difference in diameters D2a and D2b is order of 1mm - 3mm. In this specific example, the diameter D2a is 25mm, and the diameter D2b is 27mm. The angle a of inclination of the chamfer at the end 24a between 30 and 60'. 15 However in this specific embodiment the angle a is 450. The thimble 26 has an acruate configuration in the general shape of a U or C. Further, the thimble 26 has a channel like profile that convexly curved plate bearing wall 36 and a concavely 20 curved guy seating wall 38. The thimble 26 has opposite free ends or legs 40. In use, the thimble 26 is orientated so that the plate bearing wall 36 faces the circumference of the hole 18 and bears against the plate 12. The guy seating wall 38 is configured to the seat a guy or other cable/rope. 25 The plate 12 may be made to a variety of thicknesses T and widths W depending on the required load capacity for a particular application at hand. In one example, in order for the bracket 10, when made from AS3678 or 3679.1 structural 30 steel, to have a capacity of 48kN, thickness T maybe in order of 16mm, and width W in order of 60mm. Figures 5a-5c depict an embodiment of the bracket 10 in use. Here, the bracket 10 is attached to upright pole 42 via a fixing 35 in the form of a bolt 44. The bracket 10 is orientated so that the centers of holes 18 and 20 are arranged in a vertical plane with the hole 18 in below the hole 20, and the first face 16 of 4087169_1 (GHMatters) P92644.AU 20/02/13 - 8 the second portion 32 bearing against the pole 42. The bolt 44 is passed through a hole formed in the pole 42 and also through the hole 20 of the bracket 10 so that a threaded end of the blot extends beyond the hole 20 and face 14. A head 46 of the bolt 5 bears against the pole 42. A nut 48 is screwed onto the threaded end of the bolt 44 and bears either directly or via an intervening washer (not shown) against the face 14 about the hole 20. A guy 50 is secured at one end to the bracket 10 about the thimble 26. This may be achieved by any one of many 10 conventional techniques including for example the use of clamps, or swaging. An opposite end of the guy 50 is secured to a ground anchor 52 via a thimble 53 and optionally a turn buckle 54 or other tensioning device to enable adjustment of the tension in the guy 50. 15 The relative location of the pole 42 and ground anchor 52 maybe arranged so that an angle 0 of slope of the guy 50 relative to the ground is 270'- reflex angle e. In this way the guy 50 will be substantially in line with the angle of the plane containing 20 the hole 18 (which in this embodiment is parallel to the plane of the first portion 30) thereby minimizing any bending moment acting on the portion 30. The provision of the chamfered ends of the holes assists in 25 minimizing damage and wear to the thimble 26 and the bolt 44. This also minimizes the removal of galvanized coating on the bracket/bolt may lead to rust and subsequent corrosion. Now that an embodiment of the bracket 10 has been described in 30 detail it will also be apparent those of ordinary skill in the art that the bracket maybe embodied in many other forms. For example when the member 11 is in the form of a plate 12 it may be made from two separate pieces one for the part 30 and another for the part 32 and subsequently welded together rather than 35 being made from a single piece of material. Also the member 12 need not be in the form of a plate. Figure 6 illustrates a bracket 10a having a different configuration of member 11a which 4087169_1 (GHMatters) P92644.AU 20/02/13 - 9 comprises a plate like first portion 30a (similar to first portion 30) and a contiguous wedge like second portion 32a. A first hole 18a is formed in the first portion 30 to receive a thimble (not shown). The hole 18a has a diameter that lies in a 5 plane parallel to that of the first portion 18a. A second hole 20a is formed in the wedge portion 32a. For ease of fixing the end of the second hole 20a at the second face 14 can be countersunk to provide a face 55 in the plane of a diameter of hole 20a against which a bolt head 46 can abut. In the bracket 10 10a it will be appreciated that the reflex angle E is the same as in the bracket 10. Thus the second portion 32, 32a may be considered to be a fixing portion of the bracket 10, 10a as this is the portion that is used to fix the bracket to a structure, while the first portion 30,30a may be considered to be a guy 15 coupling portion as this portion is used to facilitate coupling of the guy. These two portions are relatively configured to enable a guy that is connected between the first hole and a ground anchor to extend in a line that lies in a plane of or parallel to that containing a diameter of the first hole. 20 Embodiments of the bracket 10 may be retrofitted to existing eyebolts to provide efficiencies in terms of labour and hardware. This can be achieved by undoing the nut on the threaded end of an existing installed eyebolt (which has not yet failed), locating the second hole 20 on the threaded end, and 25 then reapplying the nut possibly with an intervening washer on the threaded end. This obviates the need for a separate bolt 44 as depicted in Figure 5 and the need to drill another hole in the pole. 30 In the claims which follow and the preceding description, except where the context requires otherwise due to express language or necessary implication, the word "comprising" and variations such as "comprises" or "comprising" are used in an inclusive sense, i.e. to specify the presence of the stated features but not to 35 preclude the presence of additional or further features in various embodiments of the bracket disclosed herein. 4087169_1 (GHMatters) P92644.AU 20/02/13

Claims (5)

1. A guy bracket comprising a member provided with a first member provided with a first face, a second opposite face, and 5 first and second spaced apart through holes, each through hole opening at opposite ends onto each of the first and second faces wherein opposite ends of the first hole are chamfered to a maximum diameter at the first and second faces, and at least an end of the second hole that opens onto the first face is 10 chamfered to a maximum diameter, the first hole being configured to enable a guy coupling device to engage and move with respect to the first hole.
2. The guy bracket according to claim 1 wherein the member 15 comprises a free end near the first hole, the free end being of arcuate configuration in a plane lying parallel to a diameter of the first hole.
3. The guy bracket according to claim 2 wherein opposite 20 edges of the free end are chamfered or rounded.
4. The guy bracket according to any one of claims 1 to 3 wherein the member is configured to form a reflex angle in the range of 2000 and 2500 between a plane containing a diameter of 25 the first hole and a plane containing a diameter of the second hole.
5. The guy bracket substantially as herein described with reference to and as illustrated in the accompanying drawings. 30 4087169_1 (GHMatters) P92644.AU 20/02/13
AU2013100186A 2013-02-20 2013-02-20 Guy Bracket Expired AU2013100186A4 (en)

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AU2013100186A AU2013100186A4 (en) 2013-02-20 2013-02-20 Guy Bracket

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4023881A4 (en) * 2019-09-27 2022-11-09 Beijing Goldwind Science & Creation Windpower Equipment Co. Ltd. Guyed tower, wind power generator set and connecting devices

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4023881A4 (en) * 2019-09-27 2022-11-09 Beijing Goldwind Science & Creation Windpower Equipment Co. Ltd. Guyed tower, wind power generator set and connecting devices

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