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WO2015031063A1 - Dispositif absorbant l'énergie doté d'un élément de cisaillement spiralé - Google Patents

Dispositif absorbant l'énergie doté d'un élément de cisaillement spiralé Download PDF

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Publication number
WO2015031063A1
WO2015031063A1 PCT/US2014/051018 US2014051018W WO2015031063A1 WO 2015031063 A1 WO2015031063 A1 WO 2015031063A1 US 2014051018 W US2014051018 W US 2014051018W WO 2015031063 A1 WO2015031063 A1 WO 2015031063A1
Authority
WO
WIPO (PCT)
Prior art keywords
shearing
strip
shearable
fall
coiled
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.)
Ceased
Application number
PCT/US2014/051018
Other languages
English (en)
Inventor
Michael FEGLEY
Bradley Rohlf
Steven James MCPHERSON
Eric Manson
Ross Balquist
Justin PATTON
Andrew W. SADLEY
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.)
Honeywell International Inc
Original Assignee
Honeywell International Inc
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 Honeywell International Inc filed Critical Honeywell International Inc
Publication of WO2015031063A1 publication Critical patent/WO2015031063A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means

Definitions

  • Various embodiments relate generally to fall-protection safety equipment, especially energy absorbing devices.
  • Fall-protection safety equipment is widely used in activities that are conducted at dangerous heights. Fall-protection safety equipment is used both in employment activities and in recreational activities. New technologies may introduce new employment needs for people requiring fall-protection. For example, high- voltage power line construction and maintenance may require workers to operate high above ground level. Wind turbine towers present many employment opportunities as well. Wind turbine towers may have complex electricity generators in the turbines as well as sophisticated mechanical elements. Such turbines may require frequent maintenance. Workers who ascend these towers may be required to wear fall-protection equipment. Insurance costs may be reduced if an employer would require strong safety measures for its employees.
  • Apparatus and associated methods relate to an energy-absorbing device having a coiled shearing strip that is circumierentiaily pulled past a shearing device creating multiple parallel sheared strips.
  • a take-up spool may coil the multiple parallel sheared strips accumulating the sheared strips during an energy absorbing event.
  • frictional resistance to rotation may substantially increase.
  • the shearing strip may be scored in the pre-coiled longitudinal direction to promote the position where shearing will occur.
  • the shearing device may be a pin. The pin may have independent rollers having a.
  • Various embodiments may achieve one or more advantages. For example, some embodiments may provide a safe force profile to the user while a fall is arrested. In some embodiments, a fall arrest may permit a long but gentle force profile. In some embodiments, a predetermined force profile may result. An exemplary embodiment may permit energy absorption be wearing a small device. A replaceable shearing member may be a low-cost consumable. A custom shearing member may be selected for each worker based upon the weight of the worker. In some embodiments, the small size of the energy absorbing device may permit its use in applications where space is limited. An easily replaceable shearing member may permit companies and individuals to perform their own maintenance.
  • FIG. 1 depicts a scenario in which an exemplary Self-Retracting Lifeline (SRL) energy absorption system is used to provide safety to a workman.
  • SRL Self-Retracting Lifeline
  • FIG. 2 depicts a perspective view of an exemplary energy-absorbing device with coiled shearing.
  • FIG. 3 depicts a plan view of an exemplary energy-absorbing device with coiled shearing.
  • FIG. 4 depicts a perspective view of a cutaway of an exemplar ⁇ ' energy- absorbing device with coiled shearing.
  • FIG. 5 depicts a cross-sectional view of an exemplary energy-absorbing device with coiled shearing.
  • FIG. 6 depicts a perspective view of an exemplary shearing member in isolation.
  • FIG. 7 depicts a schematic drawing of an exemplary shearing member.
  • FIG. 8 depicts a plan view of an exemplary shearing member.
  • FIG. 9 depicts an exploded perspective view of an exemplary energy- absorbing device with coiled shearing member.
  • FIG. 10 depicts a plan view of an exemplary energy-absorbing device with coiled shearing member.
  • FIG. 11 depicts a plan view of an exemplary rotating member of an exemplary energy-absorbing device.
  • FIG. 12 depicts a plan view of an exemplar ⁇ ' shearing strip of an exemplar ⁇ ' energy-absorbing device.
  • FIG. 13 depicts a plan view of an exemplary rotating member of an exemplary energy-absorbing device.
  • FIG. 14 depicts a schematic drawing of an exemplary shearing strip.
  • FIG. 15 depicts a graph showing exemplary relationships between arresting force and felling for falls that use energy absorbing devices and for falls that do not use energy absorbing devices.
  • FIG. 1 depicts a scenario in which an exemplary Sel -Retracting Lifeline
  • a construction site 100 shows a fallen workman 105 dangling beneath a. beam 110.
  • the workman 105 has fallen a fair distance from the beam 1 10.
  • the workman's fall was arrested by a lanyard 1 15 connecting the beam 1 10 to a fall-protection harness 120 that the workman 105 is wearing.
  • the workman's fall was arrested in a controlled manner to prevent injury to the workman 105.
  • the fall-protection safety harness 120 has an exemplary energy- absorbing device 130.
  • the energy-absorbing device 130 has a coiled sharing member (not depicted in FIG. 1) within a circular housing 135.
  • a workman's fall may be abraptly arrested imparting a large force to the workman 105.
  • the energy-absorbing device may soften the fail by distributing the impacts force profile over a duration of time. The distribution of the force profile over time may permit the reduction in the maximum force imparted to the workman 105, for example. An increased distance of the fall during an arrest portion may be traded for a decreased maximum force, for example.
  • FIG. 2 depicts a perspective view of an exemplary energy-absorbing device with coiled shearing.
  • an energy-absorbing device 200 includes a rotating cable reel 205 coupled to a fixed member 210.
  • the energy-absorbing device 200 may be attached to a fail -protection safety harness for example.
  • the energy-absorbing device 200 may be deployed on a boom.
  • the rotating cable reel 205 may rotate on a bearing, for example.
  • the rotating cable reel 205 may rotate on a bushing.
  • the rotating cable reel 205 may have a spring return for automatic recoiling of cable, for example.
  • the energy -absorbing device 200 may uncoil the cable from the rotating cable reel 205 in response to the user demanding more cable at a slow rate.
  • a brake may engage which may couple the rotating cable reel 205 to a take-up spool 215.
  • the cable may be unspooled only as a user actuates a cable release mechanism.
  • a cable release mechanism may temporarily uncouple the rotating cable reel 205 from the take-up spool 215 as cable is permitted to unspool.
  • the rotating cable reel 205 may be coupled to the take-up spool 215.
  • rotation of the rotating cable reel may cause the take-up spool to rotate.
  • the rotating cable reel 205 may be permanently coupled to the take-up spool 215.
  • FIG. 3 depicts a plan view of an exemplar ⁇ ' energy-absorbing device with coifed shearing.
  • an energy-absorbing device 300 includes a rotating cable reel 305 and a take-up spool 310.
  • a shearing strip 315 is attached to the take- up spool 310 via a connecting tab 320.
  • a shearing pin 325 is interposed within a pre-sheared portion of the shearing strip 315.
  • the shearing strip 315 is coiled within a shearing cavity 330 within the rotating cable reel 305.
  • Various embodiments may have larger or smaller coiling space 335.
  • the coiling space 335 may permit a shearing strip 315 to be coiled three rotations for example.
  • the coiling member 315 is coiled two full rotations within the shearing cavity 330.
  • the shearing strip 315 is attached to the take-up spool 310. From there it becomes pre-sheared and passes both above and below the shearing pin 325. From there it coils around the inside of the shearing cavity 330 two full rotations.
  • FIG. 4 depicts a perspective view of a cutaway of an exemplary energy- absorbing device with coiled shearing.
  • a shearing strip 400 is shown without a rotating cable reel.
  • the shearing strip 400 is attached to a take-up spool (not depicted) via an angled tab 405.
  • the shearing strip 400 has a pre-sheared region 410 where a width 415 of the shearing strip 400 has been pre-sheared into three strips 420, 425, 430.
  • the two outside pre-sheared strips 420, 430 travel above a shearing pin 435.
  • the inside pre-sheared strip 425 travels below the shearing pin 435.
  • the shearing strip 400 resumes its unsheared character on either side of the pre-sheared region and is coifed for two full rotations. Should the take- up spool rotate in a counter-clockwise direction, the unsheared coils would offer resistance to rotation. If the rotational torque becomes greater than the resistance to rotation, the unsheared coils would begin to shear so as to permit strip travel past the shearing pin 435. As rotation of the take-up spool continues, the sheared portion of the shearing strip 400 may lengthen and the sheared portion of the shearing strip 400 may be coiled upon the take-up spool.
  • the shearing pin 435 is positioned within the pre-sheared region 410 of a shearing strip 400.
  • the shearing pin 435 has three rollers 440 445 450.
  • Each roller 440, 445, 450 corresponds to a sheared strip 430, 425, 420, respectively.
  • the rollers may freely rotate on a shaft of the shearing pin.
  • the rollers 440, 445, 450 may provide a. low-friction path for the sheared strips 430, 425, 420as they are pulled past the shearing pin 435.
  • the rollers 440, 445, 450 may have bushings to faciliiate their rotation.
  • the rollers 440, 445, 450 may have bearings to facilitate their rotation.
  • the rollers may be made of an oil impregnated brass, for example.
  • the rollers may be made of bronze.
  • the rollers may be made of a polymer material.
  • FIG. 5 depicts a cross-sectional view of an exemplary energy-absorbing device with coiled shearing.
  • a rotating cable reel 500 may include an attached shearing pin 505.
  • a take-up spool may be attached to a fixed member 515.
  • rotating the rotating cable reel 500 may pull the shearing pin 505 through a coiled shearing strip 520.
  • rotating the rotating cable reel 500 may pull the coiled shearing strip 520 past the shearing pin 505.
  • FIG. 6 depicts a perspective view of an exemplary shearing strip in isolation.
  • an exemplary shearing strip 600 includes a take-up spool tab 605, a pre-sheared region 610, and two coiled rotations 615.
  • the shearing strip may be made of steel.
  • the shearing strip may be made of aluminum.
  • the exemplary shearing strip 600 has three pre-sheared regions 620, 625, 630, Various embodiments may have more or fewer pre-sheared regions. Some embodiments may have an odd number of pre-sheared regions. Some embodiments may have an even number of pre-sheared regions.
  • Various embodiments may have a pin roller corresponding to each pre- sheared region, for example. In some embodiments pin rollers may not be used.
  • FIG. 7 depicts a schematic drawing of an exemplary shearing strip.
  • a plan view of a shearing strip 700 shows a pre-sheared region 705 and a shearing prepared region 710. Also depicted is a transition region 715, between the pre-sheared region 705 and the shearing prepared region 710.
  • the shearing strip 700 has channels 720 cut in the longitudinal direction.
  • grooves 725 are scored into the surface of the shearing strip 700.
  • the grooves 725 may perhaps better be seen in an end elevation view of the shearing strip 700.
  • a side perspecti ve view of the shearing strip 700 details the transition region 715.
  • the groove 725 transitions to the channel 720 at a slope 730. This slope 730 may direct the shearing from the channels 720 to along the grooves 725 during a fall event,
  • FIG. 8 depicts a plan view of an exemplary shearing strip.
  • an exemplary shearing strip 800 is depicted with exemplary dimensions.
  • the dimensions of a take-up spool 805 are given. As the diameter of the take-up spool is made larger, a longer length of material may be pulled through a shearing pin and sheared, for a fixed arrest distance. In this way, the diameter of the take-up spool can be a design parameter which can either decrease or increase the arrest distance. In some embodiments, the take-up spool diameter can be a design parameter that permits greater or lesser arrest force.
  • a shearing pin 810 is shown in relation to a shearing strip 815, and a take-up spool 805.
  • a take-up dimension 820 is the distance between an outside 825 of the take-up spool 805 and an outside surface 830 of a sheared portion of the shearing strip 810.
  • the take-up dimension 820 becomes consumed by the sheared material being so coiled.
  • the sheared material may begin to contact the outside surface 835 of the sheared portion of the shearing strip 815 that is adjacent to the shearing pin 810.
  • This fric tion may become very large, which may provide a stop for further rotation of the take-up spool 805.
  • FIG. 9 depicts an exploded perspective view of an exemplar ⁇ ? energy- absorbing device with coiled shearing strip.
  • an exemplary energ -absorbing device 900 includes a rotating member 905, a shearing strip 910, and a fixed member 915.
  • the shearing strip 910 may be attached to the fixed member 910.
  • the shearing strip 910 may be attached to the rotating member 905.
  • the exemplar)' shearing strip 910 depicted in this figure has a longitudinal score 920 in the center on both faces of the shearing strip 910.
  • the fixed member 915 has an attachment slot 925 to attach the shearing strip 910.
  • the rotating member 905 has a shearing blade 930 which may slice the shearing strip 910 in a fall event.
  • An end tab 935 may attach the shearing strip 910 to the attachment slot 925 of the fixed member 15,
  • the shearing strip 910 may have a pre-sheared region
  • the pre-sheared reion 940 of the coiled shearing s trip 910 is depic ted as having been sheared into two strips 945, 950.
  • An end tab 935 is on the end of one of the strips 945.
  • FIG. 10 depicts a plan view of an exemplary energy -absorbing device with coiled shearing strip.
  • a coiled shearing strip 1000 is depicted within a fixed member 1020.
  • the coiled shearing strip 1000 may include two pre-sheared strips 1005, 1025.
  • One of the pre-sheared strips 1005 has an attachment tab 1010.
  • a shearing point 1015 at which shearing may proceed and at which a shearing blade of a rotating member shows the location where the coiled shearing strip 1000 is being sheared.
  • the shearing point 1015 may rotate in the clockwise direction as the rotating member continues to rotate.
  • FIG. 11 depicts a ian view of an exemplary fixed member of an exemplary energy-absorbing device.
  • an exemplary fixed member 1 100 includes a locking notch 1105 in which a corresponding locking tab of a shearing strip may attach
  • FIG. 12 depicts a plan vie of an exemplary shearing strip of an exemplary energy-absorbing device.
  • an exemplary shearing strip 1200 includes a locking tab 1205, a pre-sheared region 1210 and a shear point 1215.
  • FIG. 13 depicts a plan view of an exemplary rotating member of an exemplary energy-absorbing device.
  • an exemplary rotating member 1300 includes a shearing blade.
  • FIG. 14 depicts a schematic drawing of an exemplar ⁇ ' shearing strip.
  • an exemplary shearing strip 1400 is shown in various perspective views.
  • a pre-sheared region 1405 is shown.
  • the pre-sheared region 1405 has two strips 1410, 1415.
  • One of the pre-sheared strips 1410 has a locking tab 1415.
  • a shear-prepared region 1420 has two tear channels 1425, one on either an inside face 1430 or an outside face 1435.
  • the tear channels 1425 are longitudinal scores in the center of the inside face 1430 and the outside face 1435.
  • the tear channels 1425 may provide a preferential shearing path for shearing to take place.
  • FIG. 15 depicts a graph showing exemplary relationships between arresting force and falling for falls that use energy absorbing devices and for falls that do not use energy absorbing devices.
  • a graph 1500 has a horizontal axis 1505 representing fall distance and a vertical axis 1510 representing the force that is exerted upon a worker as the fall is arrested,
  • a dangerous force level 1515 is drawn as a horizontal line on the graph 1500. If a harmful force is applied to the worker, the worker may be injured. For example, a worker may suffer whiplash if the fall is arrested in a very abrupt fashion.
  • An exemplar)' force profile 1520 corresponds to a force profile for a fall in which a worker is tethered to a beam but has not energy absorbing device.
  • a peak force 1 25 greatly exceeds the harmful force level 1515 below which safe fall arrest may be performed. Also depicted on this graph 1500 is a force profile 1530 of a fall in which a worker is tethered to a beam and the worker is wearing an exemplary energy absorbing device. A peak force 1535, in this force profile 1530 if below the harmful force threshold 1515. An even lower peak force 1540 may be achieved by using a different take-up spool radius, for example.
  • some embodiments may use different shearing element materials. Some embodiments may use steel shearing strips. Some embodiments may use aluminum shearing strips, for example. Some embodiments may use synthetic shearing strips. For example, some embodiments may use polymeric materials in which preferential fiber directions may encourage longitudinal shearing. In various embodiments, different lengths of shearing strips may be used. For example, in some embodiments, a shearing strip may be coiled numerous times within shearing cavity. Some embodiments may have a single coiled rotation. [0040] Various embodiments may pull the shearing strip past the shearing element.
  • Some embodiments may pull the shearing element past the shearing strip.
  • Various embodiments may use various geometries of shearing elements. Some shearing elements, for example may present a sharp edge to the shearing strip. Other shearing elements may facilitate shearing by directing the sheared strips along divergent paths. Some shearing elements may facilitate a tearing of the shearing strip. Some shearing elements may facilitate a slicing of the shearing strip.
  • Various shearing strips may be pre- scored to assist the preferential location of shearing. Some shearing strips may be worked in such a way as to provide a preferred shearing path. In an exemplar ⁇ ' embodiment, a shearing strip may be machined to provide a narrowing on the preferred shearing path.
  • the shearing path may be non-uniform is some embodiments. For example, the preferred shearing path may be easily sheared for the first half-rotation, and then the preferred path may be strengthened so that more arresting force may be applied for the next half-rotation of shearing.
  • the shearing profile may be customized to provide a predetermined force profile for a fall event.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Automotive Seat Belt Assembly (AREA)

Abstract

L'invention concerne un appareil et des procédés associés concernant un dispositif absorbant l'énergie doté d'une bande de cisaillement spiralée qui est tirée circonférentiellement au-delà d'un dispositif de cisaillement, ce qui crée de multiples bandes cisaillées parallèles. Une bobine d'enroulement peut enrouler les multiples bandes cisaillées parallèles, accumulant les bandes cisaillées pendant un événement d'absorption d'énergie. Lorsque le diamètre des bandes cisaillées accumulées sur la bobine d'enroulement dépasse une distance radiale du centre de la bobine d'enroulement au dispositif de cisaillement, la résistance de frottement à la rotation peut augmenter sensiblement. La bande de cisaillement peut être entaillée dans la direction longitudinale pré-enroulée pour signaler la position dans laquelle le cisaillement aura lieu. Le dispositif de cisaillement peut être une tige. La tige peut comporter des rouleaux indépendants chacun en correspondance avec l'une des bandes cisaillées. Les rouleaux peuvent réduire la résistance des bandes cisaillées lorsqu'elles sont tirées au-delà du dispositif de cisaillement. En enroulant la bande de cisaillement, des circonférences multiples du trajet de cisaillement peuvent être emballées dans un petit volume.
PCT/US2014/051018 2013-08-26 2014-08-14 Dispositif absorbant l'énergie doté d'un élément de cisaillement spiralé Ceased WO2015031063A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361870091P 2013-08-26 2013-08-26
US61/870,091 2013-08-26

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WO2015031063A1 true WO2015031063A1 (fr) 2015-03-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10232201B2 (en) * 2013-10-21 2019-03-19 Capital Safety Group (Northern Europe) Limited Fall arrest apparatus
WO2019175542A1 (fr) * 2018-03-13 2019-09-19 Latchways Plc Dispositif d'absorption d'énergie enroulé

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2334319A (en) * 1998-01-09 1999-08-18 Pavlos Yiannakopoulos Multiple use energy absorption element
WO2000024470A1 (fr) * 1998-10-23 2000-05-04 D B Industries, Inc. Connecteur absorbant l'energie
US20090194366A1 (en) * 2008-02-06 2009-08-06 Parker Thomas W Energy absorbers, connectors and horizontal lifeline systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2334319A (en) * 1998-01-09 1999-08-18 Pavlos Yiannakopoulos Multiple use energy absorption element
WO2000024470A1 (fr) * 1998-10-23 2000-05-04 D B Industries, Inc. Connecteur absorbant l'energie
US20090194366A1 (en) * 2008-02-06 2009-08-06 Parker Thomas W Energy absorbers, connectors and horizontal lifeline systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10232201B2 (en) * 2013-10-21 2019-03-19 Capital Safety Group (Northern Europe) Limited Fall arrest apparatus
WO2019175542A1 (fr) * 2018-03-13 2019-09-19 Latchways Plc Dispositif d'absorption d'énergie enroulé
GB2572019B (en) * 2018-03-13 2022-01-12 Latchways Plc Coiled energy absorber device

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