CA2589507A1 - Intermediate bracket for fall arrest cables / safety lines - Google Patents
Intermediate bracket for fall arrest cables / safety lines Download PDFInfo
- Publication number
- CA2589507A1 CA2589507A1 CA002589507A CA2589507A CA2589507A1 CA 2589507 A1 CA2589507 A1 CA 2589507A1 CA 002589507 A CA002589507 A CA 002589507A CA 2589507 A CA2589507 A CA 2589507A CA 2589507 A1 CA2589507 A1 CA 2589507A1
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- cable
- cndot
- intermediate bracket
- cut
- 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.)
- Abandoned
Links
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
- A62B35/0081—Equipment which can travel along the length of a lifeline, e.g. travelers
- A62B35/0087—Arrangements for bypassing lifeline supports without lanyard disconnection
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B1/00—Devices for lowering persons from buildings or the like
- A62B1/02—Devices for lowering persons from buildings or the like by making use of rescue cages, bags, or the like
- A62B1/04—Single parts, e.g. fastening devices
-
- 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
- A62B35/0043—Lifelines, lanyards, and anchors therefore
- A62B35/005—Vertical lifelines
-
- 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
- A62B35/0043—Lifelines, lanyards, and anchors therefore
- A62B35/0068—Anchors
-
- 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
Abstract
An intermediate bracket (1) has a base member (2) comprised of stainless steel rod bent to U-shape. A sleeve member (6) is secured by screws (7) through a lug (8) into the ends of the U. The member has a tongue (9) integral with the lug and a sleeve (10) as such. The sleeve is cut open by a transverse cut (11) and longitudinal cuts (12, 14) on opposite sides from the transverse cut to respective ends of the sleeve to allows the cable to be introduced into the sleeve. The cable is centred in the sleeve by moulded polyamide inserts (21), 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), protecting the cable (C) from touching the ends of the sleeve, anti-rotation swellings (24) which occupy the cuts (12, 14), 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.
Description
INTERMEDIATE BRACKET FOR FALL ARREST CABLES/SAFETY LINES
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.
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.
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.
The cable of such a system should remain in tension. A slack cable can frap and fail due to wear and fatigue.
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.
However this can lead to the further problem of aeolian vibration in the 'wire, i.e.
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 corner member will be of angle iron, which is particularly likely to induce uneven air flow.
The object of the present invention is to provide an improved intermediate bracket.
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;
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.
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.
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.
The cable of such a system should remain in tension. A slack cable can frap and fail due to wear and fatigue.
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.
However this can lead to the further problem of aeolian vibration in the 'wire, i.e.
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 corner member will be of angle iron, which is particularly likely to induce uneven air flow.
The object of the present invention is to provide an improved intermediate bracket.
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.
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.
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.
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.
.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.
- The wall thickness of the lining parts is such as to give the cable negligible freedom from lateral movement.
To help understanding of the invention, a specific embodiment tllereof will now be de'scribed by way of example and with reference to the accompanying 1 o drawings, in which:
Figure 1 is a perspective view of an intennediate bracket of a fall arrest system in accordance with the invention;
Figure 2 is plan view sleeve memb er of the intermediate bracket of Figure 1;
Figure 3 is a side view of the sleev e 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:
With reference to the drawings, the intermediate bracket 1 is fixed to a flange F of a corner angle iron of a pylon or tower by means of a climbing bolt B.
The 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 for the bracket. Outwards from the rod, the anns 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 of the arms 4. The member has a tongue 9 integral with the lug and a sleeve 10 as such.
The sleeve is cut open (in practice, the sleeve member is likely to be made in finished configuration by sintering), by a transverse cut 11 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 tuxning the bracket with respect to the cable or vice versa.
The cable is centred in the sleeve by moulded 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.
With the inserts in place, the cable is fully located in the centre of the sleeve.
= 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.
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.
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.
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.
.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.
- The wall thickness of the lining parts is such as to give the cable negligible freedom from lateral movement.
To help understanding of the invention, a specific embodiment tllereof will now be de'scribed by way of example and with reference to the accompanying 1 o drawings, in which:
Figure 1 is a perspective view of an intennediate bracket of a fall arrest system in accordance with the invention;
Figure 2 is plan view sleeve memb er of the intermediate bracket of Figure 1;
Figure 3 is a side view of the sleev e 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:
With reference to the drawings, the intermediate bracket 1 is fixed to a flange F of a corner angle iron of a pylon or tower by means of a climbing bolt B.
The 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 for the bracket. Outwards from the rod, the anns 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 of the arms 4. The member has a tongue 9 integral with the lug and a sleeve 10 as such.
The sleeve is cut open (in practice, the sleeve member is likely to be made in finished configuration by sintering), by a transverse cut 11 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 tuxning the bracket with respect to the cable or vice versa.
The cable is centred in the sleeve by moulded 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.
With the inserts in place, the cable is fully located in the centre of the sleeve.
Claims (9)
1. An intermediate bracket for a fall arrest system, the bracket comprising:
.cndot. ~a base member adapted to be secured to a tower;
.cndot. ~a sleeve for receiving a cable;
.cndot. ~a tongue connecting the sleeve to the base for allowing passage of a cleat along the wire and past the sleeve;
.cndot. ~a polymer lining of the sleeve for spacing the cable from the sleeve;
wherein the intermediate bracket further comprises the improvement of:
.cndot. ~the sleeve being open along a cut-out, the cut-out having:
.cndot. ~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 .cndot. ~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 .cndot. ~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.
.cndot. ~a base member adapted to be secured to a tower;
.cndot. ~a sleeve for receiving a cable;
.cndot. ~a tongue connecting the sleeve to the base for allowing passage of a cleat along the wire and past the sleeve;
.cndot. ~a polymer lining of the sleeve for spacing the cable from the sleeve;
wherein the intermediate bracket further comprises the improvement of:
.cndot. ~the sleeve being open along a cut-out, the cut-out having:
.cndot. ~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 .cndot. ~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 .cndot. ~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.
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.
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.
4. An intermediate bracket as claimed in claim 1, claim 2 or claim 3, wherein the polymer lining parts are lengths of extruded tube slit for opening to fit over the cable.
5. An intermediate bracket as claimed in claim 1, claim 2 or claim 3, wherein the polymer lining parts are injection mouldings having a longitudinal slot sized to receive the cable.
6. An intermediate bracket as claimed in claim 5, wherein the mouldings are polyamide mouldings, which are open for fitting to the cable and compressed to fit the sleeve.
7. An intermediate bracket as claimed in claim 5 or claim 6, wherein the mouldings have:
.cndot. ~keys to fit the end portions of the cut-outs, .cndot. ~mutually engaging formations to engage with each other for their retention in the sleeve and .cndot. ~end rims for protection of the cable from the ends of the sleeve.
.cndot. ~keys to fit the end portions of the cut-outs, .cndot. ~mutually engaging formations to engage with each other for their retention in the sleeve and .cndot. ~end rims for protection of the cable from the ends of the sleeve.
8. An intermediate bracket as claimed in claim 7, wherein the mouldings are mutually complementarily formed so that identical parts pressed into the sleeve from opposite ends engage with each other.
9. 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.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0426149.1 | 2004-11-29 | ||
| GBGB0426149.1A GB0426149D0 (en) | 2004-11-29 | 2004-11-29 | Fall arrest |
| PCT/GB2005/004532 WO2006056790A1 (en) | 2004-11-29 | 2005-11-28 | Intermediate bracket for fall arrest cables / safety lines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2589507A1 true CA2589507A1 (en) | 2006-06-01 |
Family
ID=33561501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002589507A Abandoned CA2589507A1 (en) | 2004-11-29 | 2005-11-28 | Intermediate bracket for fall arrest cables / safety lines |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1838395B1 (en) |
| AT (1) | ATE445442T1 (en) |
| CA (1) | CA2589507A1 (en) |
| DE (1) | DE602005017192D1 (en) |
| GB (1) | GB0426149D0 (en) |
| WO (1) | WO2006056790A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8486472B2 (en) | 2006-01-18 | 2013-07-16 | Cargill, Incorporated | Antimicrobial salt solutions for food safety applications |
| US8623439B2 (en) | 2006-05-22 | 2014-01-07 | Cargill, Incorporated | Antimicrobial salt solutions for cheese processing applications |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0616261D0 (en) * | 2006-08-16 | 2006-09-27 | Uniline Safety Systems Ltd | Intermediate support for an elongate safety member |
| CN102636340B (en) * | 2012-03-16 | 2014-04-09 | 山东省纺织科学研究院 | Fatigability check meter for movement repeating mechanism of speed difference self-controller |
| US9132297B2 (en) | 2012-07-18 | 2015-09-15 | D B Industries, Llc | Rope grab |
| US9168402B2 (en) | 2012-07-18 | 2015-10-27 | D B Industries, Llc | Rope grab |
| CN103566502B (en) * | 2013-10-09 | 2015-12-09 | 国家电网公司 | Line maintenance steps on the overall process fall arrest personal security apparatus of bar |
| NL2016476B1 (en) * | 2016-03-22 | 2017-10-05 | Xsplatforms B V | Cable guide. |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2804708B1 (en) * | 2000-02-03 | 2002-03-15 | Dalloz Fall Prot | DEVICE FOR FIXING A LIFELINE AGAINST A WALL |
| AU2002350892A1 (en) * | 2001-11-27 | 2003-06-10 | Latchways Plc | Safety line support |
-
2004
- 2004-11-29 GB GBGB0426149.1A patent/GB0426149D0/en not_active Ceased
-
2005
- 2005-11-28 EP EP05814098A patent/EP1838395B1/en not_active Not-in-force
- 2005-11-28 AT AT05814098T patent/ATE445442T1/en not_active IP Right Cessation
- 2005-11-28 CA CA002589507A patent/CA2589507A1/en not_active Abandoned
- 2005-11-28 WO PCT/GB2005/004532 patent/WO2006056790A1/en active Application Filing
- 2005-11-28 DE DE602005017192T patent/DE602005017192D1/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8486472B2 (en) | 2006-01-18 | 2013-07-16 | Cargill, Incorporated | Antimicrobial salt solutions for food safety applications |
| US8623439B2 (en) | 2006-05-22 | 2014-01-07 | Cargill, Incorporated | Antimicrobial salt solutions for cheese processing applications |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1838395B1 (en) | 2009-10-14 |
| EP1838395A1 (en) | 2007-10-03 |
| DE602005017192D1 (en) | 2009-11-26 |
| GB0426149D0 (en) | 2004-12-29 |
| ATE445442T1 (en) | 2009-10-15 |
| WO2006056790A1 (en) | 2006-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |