WO1994005929A1 - ×il de traction pivotant ameliore a element de rupture - Google Patents

×il de traction pivotant ameliore a element de rupture Download PDF

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Publication number
WO1994005929A1
WO1994005929A1 PCT/CA1993/000364 CA9300364W WO9405929A1 WO 1994005929 A1 WO1994005929 A1 WO 1994005929A1 CA 9300364 W CA9300364 W CA 9300364W WO 9405929 A1 WO9405929 A1 WO 9405929A1
Authority
WO
WIPO (PCT)
Prior art keywords
main body
breakaway
pin
central bore
shaft
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/CA1993/000364
Other languages
English (en)
Inventor
David G. Clifton
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.)
Canada Coupling Inc
Original Assignee
Canada Coupling 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 Canada Coupling Inc filed Critical Canada Coupling Inc
Priority to AU49390/93A priority Critical patent/AU4939093A/en
Publication of WO1994005929A1 publication Critical patent/WO1994005929A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F16G15/08—Swivels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
    • F16G11/044—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord
    • F16G11/048—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord by moving a surface into the cable

Definitions

  • This invention relates to swivel connector and pulling assemblies for providing a rotatable connection between two lines, and more specifically to swivels and pulling eyes including a breakaway feature..
  • Swivel connectors are well known and have been produced in many variations for years.
  • U.S. Patent Application Ser. No. 07/479,847 and U.S. Patent Application Ser. No. 07/764,816, a Continuation-In-Part of Ser. No. 07/479,847 disclose a swivel head and an improved swivel head, respectively, and are hereby incorporated herein by reference.
  • U. S. Patent 4,337,923 issued July 6, 1982 to Jackson A. Smith is representative of a fiber optic pulling eye.
  • a central strength member of the cable is exposed and inserted through a tubular body that includes a central orifice into which the strength member is inserted.
  • Opposed set screws are then screwed into the body to contact and hold the central strength member in place.
  • SUBSTITUTE SHEET swivel is shown in which breakaway protection is created by a central load pin. That pin is oriented in the longitudinal axis of the device and may include a necked down region to decrease its breaking strength. The pin is threaded into the body of the device. When breakage occurs, it may be quite difficult to remove if the threads have smeared and welded the pin to the body.
  • U.S. Patent 4,635,989 discloses a cable clamp that includes several wedge pieces that cooperate with a threaded portion to a nut-like member to force the wedge piece onto a central strength member. If the threaded portion loosens or is not tight, the wedge loses its grip on the cable and the cable comes loose. This may necessitate withdrawing the entire cable being pulled back to its starting point.
  • U.S. Patent Application Ser. No. 07/585,649 is directed to a pulling eye with breakaway, and is hereby incorporated by reference.
  • a device including a pulling eye with breakaway exists, the need exists for a compact unit which serves the functions of a swivel, a breakaway and a cable holder thereby facilitating passage through arcuate areas, around corners, facilitating winding and unwinding of the cable from a spool and decreasing the likelihood of binding and breaking of the pin or failure to rotate to relieve stress.
  • the invention provides a swivel pulling eye with breakaway combining a swivel head connector, a breakaway and a cable holder in a unitary body, providing a compact multifunctional device with advantages such as reduced cost and reduced assembly time as compared to prior devices of this nature. Its compact body reduces the chance of binding when pulling through arcuate areas or
  • the swivel head component includes a main body with a connector at one end and a bore at the other end.
  • a cooperating second body defines a central, elongated shaft which includes at least one groove which functions as an inner bearing race.
  • the shaft is constructed to be inserted into the central bore of the main body.
  • the main body includes at least one outer race which may be aligned with the inner race of said shaft to form a complete raceway for ball bearings. No cage is required for the bearings. Instead, the bearings are inserted into the raceway after the shaft is inserted into the central bore. The bearings are inserted through an opening in the side of the main body. That opening is then closed off to prevent loss of the bearings and to prevent dirt from entering the races.
  • the invention further provides a load limiting breakaway device which will fail before a load is placed on the cable being pulled which is too high.
  • the second body of the swivel component communicates with the breakaway component.
  • the breakaway component includes a main body having a threaded bore.
  • the swivel component and the breakaway component are held together by a breakaway pin.
  • a passageway is formed through the breakaway body and the shaft of the second body of the swivel component such that a pin may be inserted from the exterior of the breakaway body through the passageway to couple the bodies together.
  • the pin connecting the two bodies is the weak link which provides the load limiting function. It includes two spaced annular grooves as weak points where breakage is limited and will occur. The annular grooves are cut into the pin, spaced such that the distance between the grooves is equal to the diameter of the second body of the swivel component. In this way, the weakest portion of the pin
  • SUBSTITUTE SHEET actually resides within the shaft of said second body up to the interface between the two bodies. Failure of the pin will occur at the intersection or within the shaft. The pin will not shear across the interface to allow smearing of metal which could freeze the bodies together. Rather, the bodies will part cleanly without jamming the pin in either body passageway.
  • Such a construction allows the rapid reuse of the bodies forming the device since there is no need to drill out the passageways to remove a sheared and smeared pin.
  • the shear may occur across the interface, leaving metal to smear across the surface of both bodies when they separate.
  • the ragged ends of the sheared pins deform and seal the pin sections to the passageways requiring either a difficult removal or discarding of the device.
  • the pulling body comprises an elongated hollow body with a threaded end which may be threaded into the bore of the breakaway body.
  • the elongated hollow body houses a cable holder.
  • a product such as a cable puller should be dependable, easy to use and economical.
  • the multipurpose cable puller of the invention provides all of these features.
  • the simple design of the invention makes it easier to assemble than previous devices incorporating separate swivel and breakaway pulling eye components.
  • FIG. 1 is a perspective view showing the invention
  • FIG. 2 is a side elevational view thereof
  • FIG. 3 is a sectional view thereof, taken along line 3-3 in Fig. 2, and;
  • FIG. 4 is a view similar to that of Fig. 2 thereof, with parts cut away showing parts broken according to the invention.
  • the invention shown in the Figures provides a swivel pulling eye with breakaway which may be used for any application involving the need for a swivel connector and a cable holder. It may be used to connect a pulling cable to a bundle of optic fibers or as a connection in a fishing line.
  • the device includes a breakaway portion which would cause separation at a predetermined load limit to protect the line being pulled.
  • the invention is suitable for any application involving the need to pull a cable which has a central strength member or outer strength members. More ideally, it will be used to pull fragile cables comprised of fine wires or fiber optics. It is used to connect a bundle of cables to a pulling cable so the cable can be pulled through a underground pipe in a street or the like. Those applications sometimes involve pulls of cable that are a half a mile or more in length. Since the individual wires or fibers of the cable have little strength, the connection must distribute the pulling force in a way that the individual fibers and wires are not stretched, broken or otherwise damaged during the pull.
  • the invention as generally shown in the Figures provides a swivel pulling eye with breakaway, generally indicated at 10, having a swivel component 12 which includes a main body 14 which mates with a second body 16, a breakaway body 18 and a pulling body 20 joined to form a complete unit.
  • second body 16 of Swivel component 12 includes a shaft 26 which includes at least one inner bearing race 28.
  • Swivel component 12 includes at least one outer race 30.
  • the outer races 30 align with the inner races 28 to form a channel 34 for holding ball bearings 36.
  • An opening 38
  • SUBSTITUTE SHEET is provided through the exterior of the main body 14 to each outer race 30 through which ball bearings 36 may be inserted.
  • the opening 38 may be closed by means of a plate and a screw or simply a bolt, depending on the opening formed. In the preferred embodiment shown in the figures, opening 38 is closed by bolt 40.
  • main body 14 and second body 16 form swivel component 12 which cannot be separated without failure of every ball bearing in the device.
  • One end of main body 14 includes a cable connector 44 to which cables may be attached.
  • a cable connector 44 is of the clevis type, having tangs 46, a gap 48 and a shackle pin 50.
  • Pin 50 includes a socket head 52 and threads 54. It is secured into openings in tangs 46.
  • Cable connector 44 has a paraboloid-like profile which makes the device less capable of catching on something when being pulled.
  • a seal 56 is placed over shaft 26 and the shaft is inserted into bore 22.
  • the seal 58 may be of any type of seal designed to limit entry of foreign material into the races.
  • the seal may be as simple as a heavy grease. In the most preferred embodiment, an oil seal is employed. In some applications, no seal may be needed.
  • the breakaway body 18 has a central bore 59 with a first end 60 and a second end 62 which includes a threaded aperture 64. Breakaway body 18 also includes a passageway 66 from one side of the body to the other which passes through central bore 59.
  • the second body 16 of the swivel component 12 includes an opening 68 through the shaft 26 which may be aligned with passageway 66 such that a breakaway pin 70 may be inserted.
  • SUBSTITUTE SHEET Breakaway pin 70 provides the means for holding the swivel and pulling components together to form the completed device 10.
  • a breakaway pin 70 is inserted into the aligned path defined by passageway 66 and opening 68, the bodies are secured together as a unit.
  • pin 70 is kept within device 10 by an o-ring 72 which is snapped into an annular groove 74 formed in the breakaway body as shown.
  • the o-ring construction is preferred since it is very simple and allows a different pin to be inserted quickly. Also, the o-ring makes the pin self-centering and provides some give when the pin shears.
  • Breakaway pin 70 provides breakage at the load specified, and further minimizes smearing of metal (or other material if not metal) across the surfaces at the interface of central bore 59 and shaft 26 when pin 70 breaks.
  • Ordinary shear pins "shear" and smear metal at the interface of the passageways of the two parts. The smeared metal may reconnect the members and makes removal of the broken pin much more difficult. Often, it may be difficult to tell where the passageway is due to a smearing of metal over and beyond the passageway.
  • Pin 70 includes a central core 76 and opposed heads 78,80 which are of the same diameter.
  • Two spaced annular grooves 82,84 are formed in the pin 70 to provide a defined breakage area.
  • grooves 82,84 define a breakaway neck 86 and sloping shoulders 88,90.
  • At the head there is preferably a sharp transition zone from the breakaway neck to the head as shown in the drawings.
  • the break strength of pin 70 may vary to accommodate loads anywhere from about 200 pounds to about 1600 pounds.
  • Fig. 4 depicts the breakage of the pin 70 when the load limit is exceeded. As can be seen, the breakage occurs at zones 92,94 which are spaced such that they equal the diameter of the shaft 26. In this manner, the shearing action of the shaft and central bore interface is directly at zones 92,94. The weakest parts of pin 70 are immediately at the interface or inside shaft 26. This insures that any breakage will occur at the interface and into the shaft - not across the interface of the central bore and shaft.
  • Breakaway pin 70 includes a central groove 96 into which a colored o-ring is snapped.
  • the break strength of the pin anywhere from a load of about
  • pin 70 Very little of the material of pin 70 is left attached to heads 78,80. Thus, little metal is available to smear across the interface of the parts as they come apart. The remainder of the pin within opening 68 of shaft 26 is not smeared across the parts. Rather, it is loosely within the opening and may be readily removed and readied for a different pin. This allows the device to be reused without the need to drill out a smeared pin. Grooves 82,84 provide defined breakage points where breakage is directed and limited. The spacing ensures that the pin stubs may be readily removed.
  • o-ring 72 improves the performance of the device 10.
  • the o-ring provides some flex or give when the pin 70 breaks, allowing the broken heads 78,80 to move further out lessening any chance that they may smear against the interfacing walls of the main and second bodies.
  • the pulling body 20 is comprised of a generally tubular hollow casing 98 threaded at its fore end 100. Threaded fore end 100 connects to threaded aperture 64 of breakaway body 18. Hollow casing 98 defines a cavity 104 which changes in dimension as shown in the figures. Most of the casing includes a wide cavity. At the threaded end 100, the cavity is much narrower and is wider at the tip than at the base, such that a tapered opening 106 is formed.
  • Pulling body 20 may include any type of cable holder known in the art, including any traditional cable clamp such as a crimping type.
  • the invention may pull any type of cable, including cable with an outer strength member or an inner strength member.
  • pulling body 20 is adapted to pull a cable (not shown) which includes a central strength member formed of steel or fiberglass running the length of the cable.
  • the cable includes a plurality of fine wires or fibers about the central strength member and typically is encased in a layer of insulation. A portion of an end of the cable is pared away to expose only the central strength member. The cable is then fed into
  • Each wedge includes a longitudinal groove 114 as shown in Fig. 3.
  • Each wedge is essentially a half of a longitudinally split, frustoconical ferrule.
  • Each wedge tapers from the head 116 to the narrower tip 118.
  • Wedges 110,112 are inserted against the strength member and into the tapered opening of threaded fore end 100 until tight. Fore end 100 is then threaded onto the threaded aperture 64 of breakaway body 18, further forcing wedges 110,112 into the fore end of cavity 104, causing the grip on the central strength member to increase.
  • Aperture 64 of breakaway body 18 preferably includes a shoulder or stop 120 which will abut against the wedges and force them further into the nipple opening as the main body is threaded to the hollow casing.
  • Most of the pulling force exerted on the cable is carried by the connection of the central strength member to the device. Any tendency for the cable to slip outwardly causes a tightening on the strength member due to the tapering opening and tapered wedge design. As the cable is pulled it becomes more tightly held to the pulling component 20.
  • the swivel pulling eye with breakaway may be made from a wide variety of materials, including stainless steel, brass and plastics. The materials chosen will depend on the application,
  • the unitary construction of the swivel pulling eye with breakaway provides the advantages of a swivel head connector, a breakaway and a cable holder without the inconvenience of separate components.
  • Other advantages include reduced cost and reduced assembly time as compared to prior devices of this nature. Its compact body reduces the chance of binding when pulling through arcuate areas or failure to rotate, as compared to an assembly of separate swivel, breakaway and pulling eye components. Its compact nature enables it to easily go around corners

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ropes Or Cables (AREA)

Abstract

×il de traction pivotant amélioré à élément de rupture, comprenant un élément pivotant (12), un élément de rupture (18) et un porte-câble (20) incorporés dans un corps unique, qui forment un dispositif compact multifonctions se caractérisant par des avantages tel qu'un coût réduit et un temps de montage plus court comparés aux dispositifs de ce type de la technique antérieure. Son corps compact réduit le risque qu'il se grippe lorsqu'on le tire dans des zones arquées ou qu'il ne puisse tourner, par comparaison avec un ensemble constitué d'éléments séparés de pivotement, de rupture et d'÷il de traction.
PCT/CA1993/000364 1992-09-04 1993-09-03 ×il de traction pivotant ameliore a element de rupture Ceased WO1994005929A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49390/93A AU4939093A (en) 1992-09-04 1993-09-03 Improved swivel pulling eye with breakaway

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US94091292A 1992-09-04 1992-09-04
US940,912 1992-09-04

Publications (1)

Publication Number Publication Date
WO1994005929A1 true WO1994005929A1 (fr) 1994-03-17

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ID=25475630

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1993/000364 Ceased WO1994005929A1 (fr) 1992-09-04 1993-09-03 ×il de traction pivotant ameliore a element de rupture

Country Status (2)

Country Link
AU (1) AU4939093A (fr)
WO (1) WO1994005929A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150270035A1 (en) * 2014-03-21 2015-09-24 Quanta Associates, Lp Flexible electrical isolation device
ITUA20161954A1 (it) * 2016-03-25 2017-09-25 Liantonio Rosa Giunto girevole ad elevata resistenza meccanica
US9923345B2 (en) 2012-02-29 2018-03-20 Encore Wire Corporation Wire pulling head apparatus with crimp zone indicators and method of using same
GB2561259A (en) * 2017-06-21 2018-10-10 C Ling Ltd Pull-in head assembly
GB2561261A (en) * 2017-06-21 2018-10-10 C Ling Ltd Pull-in head assembly
CN111237389A (zh) * 2020-01-15 2020-06-05 巨力索具股份有限公司 二次剪切保护装置
US11411376B2 (en) 2017-06-21 2022-08-09 C-Ling Limited Pull-in head assembly
EP4640618A3 (fr) * 2024-04-22 2026-01-28 Hornet Acquisitionco, Llc Palan de sauvetage avec sécurité de libération de câble

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB635558A (en) * 1946-10-08 1950-04-12 Denis Victor Butler Improvements in cable end fittings
US2633375A (en) * 1947-12-01 1953-03-31 Kenneth H Wilcoxon Swivel
DE6904695U (de) * 1969-02-07 1969-06-19 Jakob Thaler Vorrichtung zum ziehen von draehten, seilen o. dgl.
US3989400A (en) * 1975-07-21 1976-11-02 Rank Industries Ltd. Pulling eye
US4337923A (en) * 1980-09-23 1982-07-06 Smith Jackson A Fibre optical cable pulling eye
US4635989A (en) * 1984-12-18 1987-01-13 Tekna Recherche & Developpement Inc. Cable clamping device
CA1221525A (fr) * 1983-12-05 1987-05-12 Tekna Recherche & Developpement Inc. Boucle de tirage
US4687365A (en) * 1985-03-07 1987-08-18 Condux International, Inc. Load limited swivel connector
US5122007A (en) * 1990-09-19 1992-06-16 Smith Jackson A Pulling eye with breakaway

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB635558A (en) * 1946-10-08 1950-04-12 Denis Victor Butler Improvements in cable end fittings
US2633375A (en) * 1947-12-01 1953-03-31 Kenneth H Wilcoxon Swivel
DE6904695U (de) * 1969-02-07 1969-06-19 Jakob Thaler Vorrichtung zum ziehen von draehten, seilen o. dgl.
US3989400A (en) * 1975-07-21 1976-11-02 Rank Industries Ltd. Pulling eye
US4337923A (en) * 1980-09-23 1982-07-06 Smith Jackson A Fibre optical cable pulling eye
CA1221525A (fr) * 1983-12-05 1987-05-12 Tekna Recherche & Developpement Inc. Boucle de tirage
US4635989A (en) * 1984-12-18 1987-01-13 Tekna Recherche & Developpement Inc. Cable clamping device
US4687365A (en) * 1985-03-07 1987-08-18 Condux International, Inc. Load limited swivel connector
US5122007A (en) * 1990-09-19 1992-06-16 Smith Jackson A Pulling eye with breakaway

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
USPTO, Official gazette, page 202, 7 September 1909, see abstract no. US933625, & US,A,933625 (CLARKSON) *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10374402B2 (en) 2012-02-29 2019-08-06 Encore Wire Corporation Wire pulling head apparatus with crimp zone indicators and method of using same
US9923345B2 (en) 2012-02-29 2018-03-20 Encore Wire Corporation Wire pulling head apparatus with crimp zone indicators and method of using same
US11670920B2 (en) 2012-02-29 2023-06-06 Encore Wire Corporation Wire pulling head apparatus with crimp zone indicators and method of using same
US11228162B2 (en) 2012-02-29 2022-01-18 Encore Wire Corporation Wire pulling head apparatus with crimp zone indicators and method of using same
US9478952B2 (en) * 2014-03-21 2016-10-25 Quanta Associates, L.P. Flexible electrical isolation device
US20150270035A1 (en) * 2014-03-21 2015-09-24 Quanta Associates, Lp Flexible electrical isolation device
ITUA20161954A1 (it) * 2016-03-25 2017-09-25 Liantonio Rosa Giunto girevole ad elevata resistenza meccanica
GB2561259A (en) * 2017-06-21 2018-10-10 C Ling Ltd Pull-in head assembly
GB2561261B (en) * 2017-06-21 2019-05-08 C Ling Ltd Pull-in head assembly
GB2561259B (en) * 2017-06-21 2019-05-08 C Ling Ltd Pull-in head assembly
US11404854B2 (en) 2017-06-21 2022-08-02 C-Ling Limited Pull-in head assembly
US11411376B2 (en) 2017-06-21 2022-08-09 C-Ling Limited Pull-in head assembly
US11418016B2 (en) 2017-06-21 2022-08-16 C-Ling Limited Pull-in head assembly
GB2561261A (en) * 2017-06-21 2018-10-10 C Ling Ltd Pull-in head assembly
EP3642919B1 (fr) * 2017-06-21 2024-02-14 C-Ling Limited Ensemble tête de traction
CN111237389A (zh) * 2020-01-15 2020-06-05 巨力索具股份有限公司 二次剪切保护装置
EP4640618A3 (fr) * 2024-04-22 2026-01-28 Hornet Acquisitionco, Llc Palan de sauvetage avec sécurité de libération de câble
US12589265B2 (en) 2024-04-22 2026-03-31 Hornet Acquisitionco, Llc Rescue hoist with cable release safety provision

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Publication number Publication date
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