WO2007116202A1 - Appareil pour cable de securite - Google Patents

Appareil pour cable de securite Download PDF

Info

Publication number
WO2007116202A1
WO2007116202A1 PCT/GB2007/001097 GB2007001097W WO2007116202A1 WO 2007116202 A1 WO2007116202 A1 WO 2007116202A1 GB 2007001097 W GB2007001097 W GB 2007001097W WO 2007116202 A1 WO2007116202 A1 WO 2007116202A1
Authority
WO
WIPO (PCT)
Prior art keywords
safety line
spooling
line apparatus
shock absorbing
safety
Prior art date
Application number
PCT/GB2007/001097
Other languages
English (en)
Inventor
David Millership
Original Assignee
Maxess Limited
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 Maxess Limited filed Critical Maxess Limited
Publication of WO2007116202A1 publication Critical patent/WO2007116202A1/fr

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
    • A62B35/0093—Fall arrest reel devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/42—Control devices non-automatic
    • 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
    • E04G21/3204—Safety or protective measures for persons during the construction of buildings against falling down
    • 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
    • E04G21/3295—Guide tracks for safety lines

Definitions

  • the present invention relates generally to safety line apparatus and more specifically to horizontal personal safety line apparatus.
  • a horizontal safety line may be used at exposed sites as a handrail and for attachment of a sliding karabiner on a lanyard of a worker's safety harness.
  • British Patent Application GB2269623 describes a horizontal safety line which is facilitated by two sections of webbing, the distal ends of which are fixed to anchor points on, for example, scaffolding and proximal ends are linked by way of a rachet that allows the 'line' to be tensioned.
  • a worker may attach himself to this line by way of a lanyard, which may be a section of webbing having an integral shock absorber, the webbing being attached at a proximal end to a harness worn by the worker and having a karabiner, at a distal end, for enabling the lanyard to be slidably attached to the horizontal line.
  • a lanyard which may be a section of webbing having an integral shock absorber, the webbing being attached at a proximal end to a harness worn by the worker and having a karabiner, at a distal end, for enabling the lanyard to be slidably attached to the horizontal line.
  • the integral shock absorber generally causes the overall length of the lanyard to increase (due to the tensile force applied to it), thereby providing damping which helps to prevent shock-related injury to the worker.
  • this type of safety line apparatus has a significant drawback in that the shock absorber causes the lanyard to extend in length when a worker falls to the extent that if the worker is operating at a height less than the resultant length of the lanyard, he will hit the ground before his fall is arrested.
  • safety line apparatus for providing a tensioned safety line between first and second anchor points, the apparatus comprising spooling means housing said safety line, said safety line having a free end by means of which it can be extended from said spooling means and anchored at said first anchor point, the apparatus further comprising shock absorbing means, one end of which is connected to said spooling means and the other end of which can be anchored at said second anchor point.
  • the above mentioned object is achieved by providing a shock absorber in-line with the safety line on the opposite side of the spool to the free end of the safety line. Further, this arrangement enables the provision of a compact, one-piece horizontal safety line that maybe less than lkg in weight and less cumbersome relative to prior art arrangements.
  • said spooling means is operable in respective first and second configurations and comprises controlling means for selectively setting the mode of operation to either said first or said second configuration.
  • said safety line can be freely extended from and returned to said spooling means.
  • said spooling means is preferably configured to operate as a ratchet by way of a rachet means, such that the length of said safety line extending from said spooling means may not be extended any further but may be shortened.
  • said safety line apparatus further comprising locking means for locking said safety line at a desired length extended from said spooling means such that it cannot be further extended from, or retracted into said spooling means and a single controlling means is preferably used to select the mode of operation of said spooling means and to operate said locking means.
  • said spooling means incorporates a metal tension frame and said tension frame beneficially comprises a first and second portion, having intersecting cross-members that may act as anchor points for components attached to said spooling device.
  • said tension frame comprises stainless steel and said tension frame beneficially has a honeycomb structure.
  • said shock absorbing means extends in length when subject to a tensile force exceeding a predetermined threshold and said shock absorbing means preferably comprises a portion of line that is gathered and bound by binding means.
  • said free end of safety line terminates in a universal end fixing and said free end of said shock absorbing means beneficially terminates in a universal end fixing.
  • said line forming said shock absorbing means and/or said safety line comprise liquid crystal polymer fibre.
  • Figure 1 is a schematic cross-sectional diagram of a spooling device according to an exemplary embodiment of the present invention showing the safety line;
  • Figure 2 is a schematic cross-sectional diagram of the spooling device of Figure 1, showing the ratchet mechanism (in its "ratchet” position);
  • Figure 3 is a schematic cross-sectional diagram of the spooling device of Figure 1, showing the ratchet mechanism (in its "closed” position);
  • Figure 4 is a schematic cross-sectional diagram of the spooling device of Figure 1, showing the ratchet mechanism (in its "open” position);
  • Figure 5 is a schematic cross-sectional diagram of the spooling device of Figure 1, showing the tension frame
  • Figure 6 is a schematic diagram of a workman attached to a horizontal safety line according to an exemplary embodiment of the present invention, pre-fall;
  • FIG 7 is a schematic diagram of the workman of Figure 6, post-fall.
  • a spooling device 10 according to an exemplary embodiment of the present invention is shown, comprising a generally circular, hollow, casing 12 having an aperture on its circumferential face. Fixed within the aperture is a guide member 18, having smooth geometry that facilitates a substantially frictionless passage though the aperture.
  • the guide member 18 may comprise any material that is durable and will not be worn easily by frequent abrasion due deployment and retraction of the safety line 16. The material should also be smooth to ensure minimal friction between the guide member 18 and the safety line 16.
  • a central spindle 14 is mounted at a substantially central position within the casing 12, attached to which is a safety line 16 that may coil around the central spindle 14 as the spindle 14 rotates.
  • the central spindle 14 may comprise a portion of stainless steel bar, however any material with suitable strength characteristics may be used.
  • the safety line 16 passes through the guide member 18 and, at a distal end to that which is attached to the central spindle 14, the safety line 16 terminates in a universal end fixing (not shown) that may be easily attached to a range of generally mutually exclusive but variable anchor points.
  • the universal end fixing may be a 25mm closed soft eyelet and karabiner that can accommodate a range of end fixings for attachment to steelwork, scaffolding, fixed anchors or the like.
  • the safety line 16 may comprise liquid crystal polymer fibre, however, any material with exceptional strength and fatigue-resistance and low stretch or creep characteristics may be used.
  • the safety line 16 may have a variable span ranging from 2m minimum, to 8m maximum, and may be fully retractable within the spooling device 10.
  • the safety line 16 may have one or more coloured strands integrated therein that may act as wear indicators. When a colour or certain colours become visible it indicates that the line 16 has worn sufficiently to require replacement.
  • a shock absorbing means 24 On a generally opposite side of the circumferential face of the casing 12 (relative to the guide member 18) is a further aperture that allows one end of a shock absorbing means 24 to pass into the casing 12.
  • This proximal end of the of the shock absorbing means 24 is fixed to an internal anchor member 22.
  • the distal end of the shock absorbing means 24 terminates in a universal end fixing 26 that may be easily attached to a range of generally mutually exclusive but variable anchor points.
  • the shock absorbing means 24 may comprise a length of polyamide, polypropylene, or polyester integral tear webbing, gathered and stitched in such a way that it will not tear when the safety apparatus is tensioned and used, but will tear when subject to a tensile force applied due to the weight of a falling workman.
  • the apparatus has a maximum deflection under load of 800mm with the shock absorber means 24 activated. It will be apparent to a person skilled in the art that many other forms of shock absorbing means could be used to provide damping, for example an elastic member, such as a spring.
  • a layering or tensioning member 20 is provided within the casing 12, that is in substantially constant contact with one face of the safety line 16 when coiling and/or uncoiling and thus aids uniform winding around the central spindle and helps to prevent the safety line 16 from becoming tangled (this problem is known in the art as 'bird nesting').
  • a rachet mechanism located within a spooling device 10 according to an exemplary embodiment of the present invention, comprising a sloping-toothed wheel 36 mounted concentrically with, and fixed to, the central spindle 14.
  • a double pawl 30 is rotatably mounted in spaced apart relation thereto on an axle 38, such that an end of the pawl 30 may engage a sloping- toothed part of the sloping-toothed wheel 36 and restrict rotation of the sloping-toothed wheel 36 (and thus the central spindle 14) in one direction.
  • a spring means 34 is provided to force the pawl 30 towards the sloping-toothed wheel 36.
  • Locking means 32 are rotatably provided in proximity to the pawl axle 38 such that the pawl 30 may be either locked in a open position (as can be seen in Figure 4), allowing the sloping-toothed wheel 36 to freely rotate in either direction, locked in a closed position (as can be seen in Figure 3), preventing movement in either direction or it may be unlocked (as can be seen in Figure 2), thereby allowing a ratchet actuation, i.e. in only one direction.
  • the central spindle 14 protrudes from the casing 12 and at this point is configured as a hexagonal nut that can be turned using, for example, a 7/16 swing spanner offering suitable torque. It is by way of this that a workman can wind in or wind out the safety line 16 from the spooling device 10.
  • a tension frame 42 is shown located within the casing 12 of a spooling device 10 according to an exemplary embodiment of the present invention.
  • the tension frame 42 may comprise two symmetrical portions as shown, configured such that one is adjacent to either inside-face of the casings 12 ,the spool 14, anchor 22, axle 38, tensioning member 20 and the like are mounted therebetween.
  • the tension frame 42 may comprise stainless steel and may have a honeycomb structure for reducing its mass. It will be appreciated that this configuration provides an arrangement having excellent tensile properties between the safety line 16 and shock absorbing means 24, whilst remaining substantially light and compact.
  • a workman 44 is shown standing on a section of scaffolding 50.
  • a safety line is connected at one end to a first anchor point 46.
  • the workman 44 is connected to the safety line 16 by way of a lanyard 52 that may have a karabiner fixed to a distal end to allow the lanyard 52 to be movably attached to the safety line 16.
  • the lanyard 52 has no integral shock absorbing means and may be approximately Im in length.
  • the proximal end may be fixed to a harness 54 worn by the workman 44.
  • the spooling device 10 can be seen towards the left hand side of the Figure, adjacent to the shock absorbing means 24, which in turn is removably fixed to a second anchor point 48. By way of this arrangement the workman may fully traverse the scaffolding 50 in a horizontal direction.
  • FIG. 7 a situation is depicted whereby the workman 44 has fallen from the scaffolding.
  • the shock absorbing means 24 has extended due to the tensile force exerted upon it as the workman falls, and the degree of extension (and therefore degree of shock absorption) is comparable to that of the prior art system, however, because of the positioning of the absorbing means 24, the overall distance the workman 44 falls is reduced (as most of the overall extension is in the horizontal component, rather than being mostly vertical), meaning that the apparatus is capable of arresting him within a 'fall-height' of less than 4m.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Emergency Lowering Means (AREA)

Abstract

Harnais de sécurité utilisé pour former un câble de sécurité entre des premier et deuxième points d'ancrage (46, 48). Le câble de sécurité (16) s'étend d'un dévidoir (10) et un moyen (24) amortisseur de chocs est monté entre le dévidoir (10) et le deuxième point d'ancrage (48) afin d'empêcher la chute d'un ouvrier (44) travaillant à des hauteurs relativement faibles.
PCT/GB2007/001097 2006-04-11 2007-03-27 Appareil pour cable de securite WO2007116202A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0607247A GB2437074B (en) 2006-04-11 2006-04-11 Safety line apparatus
GB0607247.4 2006-04-11

Publications (1)

Publication Number Publication Date
WO2007116202A1 true WO2007116202A1 (fr) 2007-10-18

Family

ID=36539719

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/001097 WO2007116202A1 (fr) 2006-04-11 2007-03-27 Appareil pour cable de securite

Country Status (2)

Country Link
GB (1) GB2437074B (fr)
WO (1) WO2007116202A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8528694B2 (en) 2006-08-08 2013-09-10 D B Industries, Llc Retractable horizontal lifeline assembly
DE202014100972U1 (de) 2013-03-05 2014-03-20 Fall Protection Engineering GmbH Seilsicherungsvorrichtung zur Sicherung von Personen gegen Absturz
US11266225B2 (en) 2018-12-13 2022-03-08 Milwaukee Electric Tool Corporation Lanyard clip
US11667026B2 (en) 2017-09-25 2023-06-06 Milwaukee Electric Tool Corporation Battery pack with lanyard receiver and tether with quick attachment
US11945682B2 (en) 2020-07-17 2024-04-02 Milwaukee Electric Tool Corporation Lanyard with locking arm

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2451835B (en) 2007-08-13 2009-07-01 Checkmate Safety Llp Fall arrest block

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105805A (en) * 1981-07-10 1983-03-30 Spanset Inter Ag Ratchet device for tightening belts surrounding loads on trailers
GB2269623A (en) * 1992-07-29 1994-02-16 Spanset Inter Ag Safety line
US5598900A (en) * 1994-10-21 1997-02-04 Surety Manufacturing & Testing Ltd. Horizontal lifeline energy absorber
US6338399B1 (en) * 1998-04-02 2002-01-15 Gary E. Choate Energy absorption device for fall arrest systems
WO2002019547A2 (fr) * 2000-08-31 2002-03-07 Choate Gary E Procede permettant de reduire la tension et l'extension du cable de securite horizontal durant une interruption de chute
US6446936B1 (en) * 1997-10-23 2002-09-10 Meyer Ostrobrod Safety apparatus for horizontal lifeline

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5332071A (en) * 1993-03-09 1994-07-26 Sinco Incorporated Shock absorber for safety cable system
GB2370089C (en) * 2000-05-18 2002-08-21 Keyguard Ltd Energy absorber

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105805A (en) * 1981-07-10 1983-03-30 Spanset Inter Ag Ratchet device for tightening belts surrounding loads on trailers
GB2269623A (en) * 1992-07-29 1994-02-16 Spanset Inter Ag Safety line
US5598900A (en) * 1994-10-21 1997-02-04 Surety Manufacturing & Testing Ltd. Horizontal lifeline energy absorber
US6446936B1 (en) * 1997-10-23 2002-09-10 Meyer Ostrobrod Safety apparatus for horizontal lifeline
US6338399B1 (en) * 1998-04-02 2002-01-15 Gary E. Choate Energy absorption device for fall arrest systems
WO2002019547A2 (fr) * 2000-08-31 2002-03-07 Choate Gary E Procede permettant de reduire la tension et l'extension du cable de securite horizontal durant une interruption de chute

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8528694B2 (en) 2006-08-08 2013-09-10 D B Industries, Llc Retractable horizontal lifeline assembly
US8739929B2 (en) 2006-08-08 2014-06-03 D B Industries, Llc Retractable horizontal lifeline assembly
DE202014100972U1 (de) 2013-03-05 2014-03-20 Fall Protection Engineering GmbH Seilsicherungsvorrichtung zur Sicherung von Personen gegen Absturz
US11667026B2 (en) 2017-09-25 2023-06-06 Milwaukee Electric Tool Corporation Battery pack with lanyard receiver and tether with quick attachment
US11266225B2 (en) 2018-12-13 2022-03-08 Milwaukee Electric Tool Corporation Lanyard clip
US11849832B2 (en) 2018-12-13 2023-12-26 Milwaukee Electric Tool Corporation Lanyard clip
US11945682B2 (en) 2020-07-17 2024-04-02 Milwaukee Electric Tool Corporation Lanyard with locking arm

Also Published As

Publication number Publication date
GB2437074B (en) 2008-05-28
GB2437074A (en) 2007-10-17
GB0607247D0 (en) 2006-05-17

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