GB2432567A - Fall arrest cable bracket - Google Patents

Fall arrest cable bracket Download PDF

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Publication number
GB2432567A
GB2432567A GB0624816A GB0624816A GB2432567A GB 2432567 A GB2432567 A GB 2432567A GB 0624816 A GB0624816 A GB 0624816A GB 0624816 A GB0624816 A GB 0624816A GB 2432567 A GB2432567 A GB 2432567A
Authority
GB
United Kingdom
Prior art keywords
sleeve
cable
intermediate bracket
cut
bracket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0624816A
Other versions
GB0624816D0 (en
GB2432567B (en
Inventor
Bernard Raymond Warren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rapid Rail International Ltd
Original Assignee
Rapid Rail International Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rapid Rail International Ltd filed Critical Rapid Rail International Ltd
Priority claimed from GB0601370A external-priority patent/GB2420544B/en
Publication of GB0624816D0 publication Critical patent/GB0624816D0/en
Publication of GB2432567A publication Critical patent/GB2432567A/en
Application granted granted Critical
Publication of GB2432567B publication Critical patent/GB2432567B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/0043Lifelines, lanyards, and anchors therefore
    • A62B35/0068Anchors
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B1/00Devices for lowering persons from buildings or the like
    • A62B1/20Devices for lowering persons from buildings or the like by making use of sliding-ropes, sliding-poles or chutes, e.g. hoses, pipes, sliding-grooves, sliding-sheets
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B35/00Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
    • A62B35/0043Lifelines, lanyards, and anchors therefore
    • A62B35/005Vertical lifelines
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/32Safety or protective measures for persons during the construction of buildings
    • E04G21/3261Safety-nets; Safety mattresses; Arrangements on buildings for connecting safety-lines

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)

Abstract

An intermediate bracket for a fall arrest system has base member 2 which can be secured to flanges F, Ff of a tower, a sleeve 10 for receiving a cable C and a tongue 9 connecting the sleeve to the base for allowing passage of a cleat along the cable and past the sleeve 10. The sleeve has a cut-out having a central, transverse portion on the opposite side from the tongue 9 for introduction of the cable into the sleeve at an orientation transverse to the length of the sleeve with the cut out including end portions on opposite sides of the sleeve, extending from the transverse portion to the end of the sleeve for turning of the bracket about the introduced the cable for alignment of the sleeve and the cable.

Description

<p>FALL ARREST</p>
<p>The present invention relates to a bracket for a fall arrest system particularly though not exclusively for use by linesmen working on electricity supply towers or pylons.</p>
<p>Conventionally, linesmen clip themselves onto a tower via bolts used for climbing the tower. This is renders the climb slow and awkward, with clipping continuously being overhead and un-clipping low down. I0</p>
<p>Fall arrest systems comprising a cable which extends continuously up the tower have been developed, a linesman clipping on at anti-climbing device level via a sliding cleat, which jams if he falls.</p>
<p>The cable of such a system should remain in tension. A slack cable can frap and fail due to wear and fatigue.</p>
<p>Usually, the cable will be so long as to require an intermediate bracket or indeed several such brackets. Frapping of the cable in an intermediate bracket is a particular problem, with long runs of the cable on both sides of the bracket. The : * : * frapping problem can be relieved by ensuring that the cable remains tensioned.</p>
<p>* ..* However this can lead to the further problem of aeolian vibration in the wire, i.e. ***.</p>
<p>resonance of the wire induced by wind currents around the tower and in particular *..: around the corner of the tower on which the fall arrest system is installed. Usually the * : * 25 corner member will be of angle iron, which is particularly likely to induce uneven air flow. * * **** *1</p>
<p>*.: The object of the present invention is to provide an improved intermediate bracket.</p>
<p>According to the invention there is provided an intermediate bracket for a fall arrest system, the bracket comprising: * a base member adapted to be secured to a tower; * a sleeve for receiving a cable; * a tongue connecting the sleeve to the base for allowing passage of a cleat along the wire and past the sleeve; * a polymer lining of the sleeve for spacing the cable from the sleeve; wherein the intermediate bracket further comprises the improvement of: * the sleeve being open along a cut-out, the cut-out having: * a central, transverse portion opposite from the tongue for introduction of the cable into the sleeve at an orientation transverse to the length of the sleeve and * end portions on opposite sides of the sleeve, extending from the transverse portion to the end of the sleeve for turning of the bracket about the introduced the cable for alignment of the sleeve and the cable, and * the polymer lining is comprised of two parts, each being split for positioning over the cable and introduction into the opposite ends of the sleeve.</p>
<p>The significant advantage of the improved intermediate bracket is that as opposed to requiring threading from the end of the cable, a tedious operation liable to cause skimping on the number of the brackets and use of unsuitable erroneously threaded brackets at the wrong position along the cable, the intermediate brackets can be installed wherever required at whatever stage in the process of installation of the : .. fall arrest system. S... * . S...</p>
<p>Whilst the transverse portion of the cut-out could be angled towards the ends * . of the sleeve, it is preferably at right angles to the length of the sleeve. *....</p>
<p>* . 25 The polymer lining parts could be lengths of extruded tube, either of a size to fit between the cable and sleeve and slit for opening to fit over the cable or over-size * and double-slit to remove a strip so that it can be compressed to a size to fit.</p>
<p>Alternatively the lining parts can be injection mouldings, again either moulded to be opened for fitting or closed for fitting. In the preferred embodiment, the parts are polyamide mouldings, which are open for fitting to the cable and compressed to fit the sleeve. Also they have keys to fit the end portions of the cut-outs, mutually engaging formations to engage with each other for their retention in the sleeve and end rims for protection of the cable from the ends of the sleeve. The preferred lining parts are mutually complementarily formed so that identical parts pressed into the sleeve from opposite ends engage with each other.</p>
<p>The wall thickness of the lining parts is such as to give the cable negligible freedom from lateral movement.</p>
<p>To help understanding of the invention, a specific embodiment thereof will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a perspective view of an intermediate bracket of a fall arrest system in accordance with the invention; Figure 2 is plan view sleeve member of the intermediate bracket of Figure]; Figure 3 is a side view of the sleeve member; Figure 4 is a front view of the sleeve member; Figure 5 is a perspective view of a polyamide liner for the sleeve member; and Figure 6 is a view similar to Figure 4 showing two liners fitted to the sleeve member.</p>
<p>: ** With reference to the drawings, the intermediate bracket I is fixed to a flange F of a corner angle iron of a pylon or tower by means of a climbing bolt B. The I... bracket has a base member 2 comprised of stainless steel rod bent to U-shape. A * * welded-on cross bar 3 holds the U against spreading and provides a positioning stop * : 25 for the bracket. Outwards from the rod, the arms 4 of the U are bent 5 to bring a cable C of the fall arrest system (otherwise un-illustrated) into the bisector plane of the two *:: flanges F,Ff of the angle iron. A sleeve member 6 is secured by screws 7 through a lug 8 into the ends ofthe arms 4. The memberhas atongue 9 integral with thelug and a sleeve 10 as such.</p>
<p>The sleeve is cut open (in practice, the sleeve member is likely to be made in finished configuration by sintering), by a transverse cut I I and longitudinal cuts 12,14 on opposite sides from the transverse cut to respective ends of the sleeve. This allows the cable to be introduced into the sleeve by turning the bracket with respect to the -cable or vice versa.</p>
<p>The cable is centred in the sleeve by rnoulded polyamide inserts 21, which are moulded over size diametrically, with a longitudinal slot 22 sized to receive the cable and yet be closed with edges abutting when introduced into the sleeve. The inserts also have rims 23 which abut the ends of the sleeve and extend out to the diameter of the sleeve, thus protecting the cable from touching the ends of the sleeve. The inserts have anti-rotation swellings 24 which occupy the cuts 12,14. Also they have detents 25 on the inside of the swellings and opposite, complementary openings 26. These engage with each other when the inserts are pushed into the sleeve from opposite ends and abut in the middle.</p>
<p>With the inserts in place, the cable is fully located in the centre of the sleeve. * ** * * . **** **** * * S. S * *S * *. *</p>
<p>*....S * I S.. * S a... *. I S * S **</p>

Claims (1)

  1. <p>CLAIMS</p>
    <p>1. An intermediate bracket for a fall arrest system, the bracket comprising: * a base member adapted to be secured to a tower; * a sleeve for receiving a cable; and * a tongue connecting the sleeve to the base for allowing passage of a cleat along the wire and past the sleeve; wherein the intermediate bracket further comprises the improvement of: * the sleeve being open along a cut-out, the cut-out having: * a central, transverse portion opposite from the tongue for introduction of the cable into the sleeve at an orientation transverse to the length of the sleeve and end portions on opposite sides of the sleeve, extending from the transverse portion to the end of the sleeve for turning of the bracket about the introduced cable for alignment of the sleeve and the cable.</p>
    <p>2. An intermediate bracket as claimed in Claim 1, wherein the transverse portion of the cut-out is angled towards the ends of the sleeve.</p>
    <p>3. An intermediate bracket as claimed in Claim 1, wherein the transverse portion of the cut-out is at right angles to the length of the sleeve.</p>
    <p>* *. 20 4. An intermediate bracket for a fall arrest system, the bracket comprising: ::::: * a base member adapted to be secured to a tower; * asleeveforreceivingacable; * a tongue connecting the sleeve to the base for allowing passage of a cleat along the wire and past the sleeve; * a polymer lining of the sleeve for spacing the cable from the sleeve; wherein the intermediate bracket further comprises the improvement of: * ** * the sleeve being open along a cut-Out, the Cut-Out having: * a central, transverse portion opposite from the tongue for introduction of the cable into the sleeve at an orientation transverse to the length of the sleeve and end portions on opposite sides of the sleeve, extending from the transverse portion to the end of the sleeve for turning of the bracket about the introduced cable for alignment of the sleeve and the cable, and * the polymer lining is comprised of two parts, each being split for positioning over the cable and introduction into the opposite ends of the sleeve.</p>
    <p>5. An intermediate bracket as claimed in Claim 4, wherein the transverse portion of the cut-Out is angled towards the ends of the sleeve.</p>
    <p>6. An intermediate bracket as claimed in Claim 4, wherein the transverse portion of the cut-out is at right angles to the length of the sleeve.</p>
    <p>7. An intermediate bracket as claimed in any one of Claims 4 to 6, wherein the polymer lining parts are lengths of extruded tube slit for opening to fit over the cable.</p>
    <p>8. An intermediate bracket as claimed in any one of Claims 4 to 6, wherein the polymer lining parts are injection mouldings having a longitudinal slot sized to receive the cable.</p>
    <p>9. An intermediate bracket as claimed in Claim 8, wherein the mouldings are polyamide mouldings, which are open for fitting to the cable and compressed to fit the sleeve.</p>
    <p>:.:::. 10. An intermediate bracket as claimed in Claim 8 or Claim 9, wherein the mouldings have: * keys to fit the end portions of the cut-outs; mutually engaging formations to engage with each other for their * 25 retention in the sleeve and * * * end rims for protection of the cable from the ends of the sleeve. ****</p>
    <p> 11. An intermediate bracket as claimed in Claim 10, wherein the mouldings are mutually complementarily formed so that identical parts pressed into the sleeve from opposite ends engage with each other.</p>
    <p>12. An intermediate bracket as claimed in.any preceding claim, wherein the wall thickness of the mouldings is such as to give the cable negligible freedom from lateral movement. * ** * * * *.** S... * * *... *S * * . . * *. *</p>
    <p>*...** * . S.. * I * I. S S* S 55</p>
    <p>AMENDMENTS TO THE CLAIMS HAVE BEEN FILED AS FOLLOWS</p>
    <p>CLAIMS</p>
    <p>1. An intermediate bracket for a fall arrest system, the bracket comprising: * a base member adapted to be secured to a tower; * a sleeve for receiving a cable; and * a tongue connecting the sleeve to the base for allowing passage of a cleat along the wire and past the sleeve; wherein the intermediate bracket further comprises the improvement of: * the sleeve being open along a cut-out, the cut-out having: * a central, transverse portion opposite from the tongue for introduction of the cable into the sleeve at an orientation transverse to the length of the sleeve and * end portions on opposite sides of the sleeve, extending from the transverse portion to the end of the sleeve for turning of the bracket about the introduced cable for alignment of the sleeve and the cable.</p>
    <p>2. An intermediate bracket as claimed in Claim 1, wherein the transverse portion of the cut-Out is angled towards the ends of the sleeve.</p>
    <p>3. An intermediate bracket as claimed in Claim 1, wherein the transverse portion of the cut-out is at right angles to the length of the sleeve.</p>
GB0624816A 2005-11-28 2005-11-28 Fall arrest Active GB2432567B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0601370A GB2420544B (en) 2005-11-28 2005-11-28 Fall arrest support

Publications (3)

Publication Number Publication Date
GB0624816D0 GB0624816D0 (en) 2007-01-24
GB2432567A true GB2432567A (en) 2007-05-30
GB2432567B GB2432567B (en) 2007-07-04

Family

ID=37712016

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0624816A Active GB2432567B (en) 2005-11-28 2005-11-28 Fall arrest

Country Status (1)

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GB (1) GB2432567B (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010011721A1 (en) * 2000-02-03 2001-08-09 Dalioz Fall Protection Device for fixing a lifeline against a wall
WO2003039681A1 (en) * 2001-11-09 2003-05-15 Sala Group Limited Methods and apparatus for providing fall-arrest protection
GB2388148A (en) * 2002-04-26 2003-11-05 Safeline Uk Ltd An anchoring device for a safety line in a fall arrest system
GB2403256A (en) * 2003-06-27 2004-12-29 Latchways Plc Safety line anchor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20010011721A1 (en) * 2000-02-03 2001-08-09 Dalioz Fall Protection Device for fixing a lifeline against a wall
WO2003039681A1 (en) * 2001-11-09 2003-05-15 Sala Group Limited Methods and apparatus for providing fall-arrest protection
GB2388148A (en) * 2002-04-26 2003-11-05 Safeline Uk Ltd An anchoring device for a safety line in a fall arrest system
GB2403256A (en) * 2003-06-27 2004-12-29 Latchways Plc Safety line anchor

Also Published As

Publication number Publication date
GB0624816D0 (en) 2007-01-24
GB2432567B (en) 2007-07-04

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