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WO1998018035A1 - Connecteur de fibres optiques resistant a la compression et a la traction pour couplage avec une enveloppe - Google Patents

Connecteur de fibres optiques resistant a la compression et a la traction pour couplage avec une enveloppe Download PDF

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Publication number
WO1998018035A1
WO1998018035A1 PCT/US1997/018747 US9718747W WO9818035A1 WO 1998018035 A1 WO1998018035 A1 WO 1998018035A1 US 9718747 W US9718747 W US 9718747W WO 9818035 A1 WO9818035 A1 WO 9818035A1
Authority
WO
WIPO (PCT)
Prior art keywords
fiber optic
housing
crimp
intermediate housing
optic cable
Prior art date
Application number
PCT/US1997/018747
Other languages
English (en)
Inventor
Soren Grinderslev
Original Assignee
The Whitaker Corporation
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 The Whitaker Corporation filed Critical The Whitaker Corporation
Priority to AU49068/97A priority Critical patent/AU4906897A/en
Publication of WO1998018035A1 publication Critical patent/WO1998018035A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3887—Anchoring optical cables to connector housings, e.g. strain relief features
    • G02B6/3888—Protection from over-extension or over-compression
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
    • G02B6/3874—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using tubes, sleeves to align ferrules
    • G02B6/3878—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls using tubes, sleeves to align ferrules comprising a plurality of ferrules, branching and break-out means

Definitions

  • the present invention relates to a connector used for attaching a multiconductor cable to an enclosure and more particularly to a connector that may be coupled to an enclosure without rotation of the cable or the enclosure.
  • An emerging information infrastructure is hybrid fiber coax in which a fiber optic cable stretches from a central office or head end to a distribution point.
  • a copper coaxial cable extends from the distribution point to a recipient of the information service.
  • This architecture is also referred to as fiber to the feeder.
  • Conversion from the fiber distribution media to the copper distribution media occurs at the distribution point in an enclosure referred to as a node .
  • the node is commonly positioned in aerial mounts for pole to pole connections.
  • the node may feed anywhere from 1 - 200 users depending upon the application.
  • the node is also subject to harsh environmental conditions as it is typically exposed to the elements.
  • the node is an important link in the infrastructure. Accordingly, the viability of the node connection is very important both to providers of the information service as well as recipients of the same service.
  • the interconnection at the node enclosure is a vulnerable link in the distribution system.
  • the CATV node receives a multiple conductor fiber optic cable.
  • the cable is held by a feed through connector which is mounted to a wall of the node enclosure.
  • the cable is broken out into its individual fibers for distribution and interconnection with electronics held within the node enclosure. Due to the harsh environment in which the node enclosure resides, the enclosure, the feed through connector, and the fitting of the cable to the connector must sufficiently protect the fiber optic cable so as not to degrade performance of the signal and consequently the system.
  • the CATV industry has dictated certain requirements of the equipment used at the distribution point or node.
  • Requirements of the CATV node enclosure interconnection include the ability of the connection between the feedthrough connector and the enclosure to withstand a minimum 150 lb. tensile force on the fiber optic cable. Reliable node interconnection also requires tolerance to the mechanical movement of the constituent parts of the fiber optic cable and connector due to thermal fluctuations, physical protection of the fibers, and resistance to moisture penetration. In addition, it is important that the fitting for the cable that is to go into the node enclosure be reliably field mountable and able to withstand tensile, compressive and rotational forces imposed on the cable, node enclosure and feed through connector when the node enclosure is hoisted up and down a pole during installation and repair. The feed through connector must be mounted onto the enclosure of the node without rotating the cable or the enclosure and when mounted must resist rotation when the cable is subjected to rotational forces.
  • node enclosures can receive two styles of fiber optic cable, a dielectric style and an armored style.
  • a dielectric style can accommodate each style of cable.
  • an armored style can accommodate each style of cable.
  • a single connector capable of reliable termination of either cable style while providing a high quality ground for an armored cable.
  • U.S. Patent Numbers 5,371,821 and 5,315,684 disclose a fiber optic connector comprising an intermediate housing engageable with a mating section and a securing section.
  • a crimp member comprising a split sleeve is actuated by axial movement of the sleeve urged into the intermediate housing by axial movement of the securing section.
  • the connector may be terminated to a cable and coupled to a housing without rotating the cable.
  • the coupled connector resists rotational displacement of the cable relative to the connector in response to rotational forces placed on the cable.
  • the crimp member and intermediate housing are disengageable with the fiber optic cable upon disengagement of the securing member rendering the resistance to movement in response to tensile and compressive forces less than optimum.
  • a fiber optic connector capable of being coupled to an enclosure without rotation of the cable or enclosure that is more resistant to displacement between the connector and the cable in response to tensile and compressive forces placed on the cable than prior art connectors.
  • the connector is decoupled from the enclosure for example, during maintenance procedures, it is desirable that the connector and cable be decoupled from the enclosure, while in addition ensuring that the connector remains in place on the cable after decoupling. This makes handling and re- coupling of the connector and cable to the enclosure easier and more reliable.
  • a fiber optic connector for terminating a fiber optic cable comprises an intermediate housing having opposite engaging ends being rotatable about the fiber optic cable.
  • a first crimp member having a first physical stop and a second crimp member having a second physical stop are disposed adjacent the opposite ends of the intermediate housing.
  • the first and second physical stops limit movement of the intermediate housing along the cable when the first and second crimp members are actuated through engagement with the ends.
  • the fiber optic connector further comprises a mating housing engageable with the intermediate housing and a securing housing engageable with the intermediate housing.
  • a method of terminating a fiber optic cable comprises the steps of stripping a fiber optic cable jacket to expose strength members, an inner tube and individual fibers, positioning a securing housing, a first crimp member, an intermediate housing, a second crimp member, and a crimping tool over the fiber optic cable jacket, actuating the first and second crimp members by threading the securing housing and the tool to the intermediate housing, partially disengaging the securing housing from the intermediate housing, removing the tool, and threading a mating housing to the intermediate housing.
  • Figure 1 is a side view of an armored fiber optic cable prepared for termination with a fiber optic connector according to the teachings of the present invention.
  • Figure 2 is a cross-sectional view of an intermediate housing.
  • Figure 3 is a cross-sectional view of a securing housing.
  • Figure 4 is a cross-sectional of a mating housing.
  • Figure 5 is a cross-sectional view of one embodiment of a crimp member.
  • Figure 6 is a cross-sectional view of an alternate and preferred embodiment of a crimp member.
  • Figure 7 is an exploded cross-sectional view of constituent parts of a fiber optic cable connector according to the teachings of the present invention shown relative to the fiber optic cable prior to termination of the cable assembly.
  • Figure 8 is cross-sectional detailed view of a crimp member as shown in figure 5 prior to actuation.
  • Figure 9 is cross-sectional detailed view of a portion of a crimp member similar to that shown in Figure 8 but shown upon actuation.
  • Figure 10 is a cross-sectional detailed view of a crimp member shown in Figure 6 prior to actuation.
  • Figure 11 is a cross-sectional detailed view of a crimp member as shown n Figure 6 upon actuation.
  • Figure 12 is a side view of a partial assembly of a fiber optic connector according to the teachings of the present invention.
  • Figure 13 is a cross-sectional view of a fiber optic connector according to the teachings of the present invention shown subsequent to termination of the fiber optic cable and prior to termination of the individual fibers.
  • Figure 14 is a perspective view of the mating end and of a fiber optic connector according to the teachings of the present invention shown subsequent to termination of the fiber optic cable and prior to termination of the individual fibers.
  • Figure 15 is a perspective view of the securing end of a fiber optic connector according to the teachings of the present invention shown subsequent to termination of the fiber optic cable and prior to termination of the individual fibers.
  • Figure 16 is a cross-sectional view of a terminated fiber optic connector and cable according to the teaching of the present invention shown as connected to an enclosure.
  • a substantially tubular intermediate housing (1) defining a longitudinal axis (9) along the length of the housing (1) .
  • An inner diameter of the intermediate housing (1) is slightly greater than the outer diameter of a jacketed fiber optic cable.
  • a center section (2) of the intermediate housing (1) comprises an area of large outer diameter the outer cross-section of which is a hexagonal configuration.
  • the intermediate housing (1) further comprises opposite engaging ends (5) distal from the center section (2) .
  • the threads (6) of each engaging end (5) extend from the outermost ends of the intermediate housing to a position short of the first and second o-ring shoulders (3,4).
  • An innermost end of the threads (6) positioned a distance from the first and second o-ring shoulders (3,4) create an o-ring seat (7) in which is disposed an o-ring.
  • Each engaging end (5) further comprises a 45° angular chamfer (8) angled toward the inner diameter of the intermediate housing (1) .
  • the intermediate housing is symmetrical about both a plane intersecting the longitudinal axis (9) as well as a plane transverse to the longitudinal axis (9) and cutting through the center section (2) .
  • the intermediate housing is made of nickle plated aluminum.
  • a substantially tubular securing housing (10) made of nickle plated aluminum and having a hexagonal cross-sectional outer diameter profile.
  • An inner geometry of the securing housing comprises a complimentary engaging end (11) designed to be threadably engageable with the engaging end (5) of the intermediate housing (1) .
  • the threads (12) are positioned slightly internal to the complimentary engaging end (11) creating an o-ring recess (13) adjacent the threaded portion of the complimentary engaging end (11) .
  • the securing housing (10) further includes an area where the inner diameter converges from a larger inner diameter in which the threads (12) are positioned to a smaller inner diameter section toward a sealing end (14) of the securing housing (10) .
  • the sealing end (14) further comprises an area of annular relief creating an o-ring seat (15) positioned close to and adjacent the sealing end (14) of the securing housing (10) .
  • the area of transition from a larger inner diameter to a smaller inner diameter section of the securing housing (10) can be a linear transition creating an angled annular transition (not shown) or, and in a preferred embodiment, the transition is radiused to create an annular force transmitting element (16) .
  • the coupling section (18) has external threads for coupling to a CATV node enclosure. Adjacent to the threads of the coupling section (18) is a relief area creating an o-ring seat (20) on an outer diameter of the mating housing (17) .
  • the attachment section (19) has an internal threaded coupling and an outer diameter the cross section of which has a hexagonal configuration. The internal threads of the attachment section (19) are appropriate for interconnection with the external threads on the engaging end (5) of the intermediate housing (1) .
  • first and second crimp members (22,23) there is shown two embodiments of first and second crimp members (22,23) according to the teachings of the present invention.
  • Figure 5 shows the cross-section of one embodiment of the first and second crimp members.
  • First and second crimp members (22,23) comprise an annular clamp ring preferably made of halfhard brass.
  • the first and second crimp members Relative to a longitudinal axis (9) that extends through the center of the annular clamp ring, the first and second crimp members have a non uniform outer diameter with a maximum outer diameter being positioned at a center of the first and second crimp members (22,23) along their length. It is preferred that the outer diameter transition in thickness from an initial thickness at the outermost ends of the crimp members increasing along a line angled at 20° with respect to the longitudinal axis (9) .
  • the area of maximum outer diameter comprises a physical stop (24) to be described more fully hereinafter.
  • the preferred embodiment includes the nonuniform outer diameter having at its center a maximum outer diameter.
  • the preferred embodiment further comprises a relief area created by inwardly angled hinge walls (26) positioned on an inner diameter that is directly in line with the area of maximum outer diameter.
  • the hinge walls (26) are preferable at 90° with respect to each other defining a pivot point 27 at an intersection of the two hinge walls (26) .
  • Figure 7 of the drawings there is shown an exploded cross-sectional view of constituent parts of a fiber optic connector according to the teachings of the present invention shown relative to a prepared armored fiber optic cable.
  • the fiber optic connector according to the teachings of the present invention is assembled by first stripping and preparing a fiber optic cable for receipt of the connector.
  • the jacket (100) is stripped to expose the strength members (101) , the gel filled inner tube (102) , and fibers (103) of the fiber optic cable.
  • Preparation of an armored fiber optic cable includes stripping the jacket (100) to expose a length of the armor (104) , the strength members (101) , the inner tube (102) , and the fibers (103) .
  • the armor (104) that is exposed and is not covered by the jacket is cut to form a strip of metal which is then retroflexed over the jacket of the fiber optic cable as shown in Figure 7 of the drawings.
  • the securing housing (10) , the first crimp member (22) , the intermediate housing (1) , and the second crimp member (23) are threaded onto the jacketed cable and positioned over the strip of retroflexed armor (104) .
  • the intermediate housing (1) is positioned at an appropriate distance from an end of the jacket (100) of the fiber optic cable.
  • First and second crimp members (22,23) are positioned adjacent each engaging end (5) of the intermediate housing (1) . At this point in the assembly process, the engaging end (5) of the intermediate housing (1) closest to the exposed fibers (103) of a fiber optic cable, defines a coupling end (28) of the intermediate housing (1) .
  • the engaging end (5) of the intermediate housing (1) opposite to the coupling end (28) is defined as the securing end (29) of the intermediate housing (1) .
  • a tool (not shown) which is preferably identical in form to the securing housing (10) is used to crimp the first crimp member (22) to the jacket.
  • the securing housing (10) is used to crimp second crimp member (23) to the jacket (100) in the same way and simultaneously with the first crimp member (22) .
  • FIG. 8 shows a cross-sectional detailed view of the relative positioning of the securing housing (10) and the first crimp members (22) (on a coupling end (28) of the intermediate housing (1) , the tool relative to the second crimp member (23)), and the inner chamfer (8) of the intermediate housing (1) .
  • Figure 8 shows the crimp member (23) prior to actuation of the crimp and
  • Figure 9 shows the same parts after actuation of the crimp.
  • Actuation of the crimp proceeds as follows: as the securing housing (10) is threaded onto the intermediate housing (1) , the force transmitting element (16) of the securing housing (10) engages a section of the first crimp member (22) having an annularly tapered outer diameter. Further movement of the force transmitting element (10) against the first crimp member (22) pushes the first crimp member along the jacketed cable until it engages the inner chamfer (8) of the intermediate housing (1) . Further axial movement of the force transmitting element (10) in combination with the stationary inner chamfer (8) causes a force vector to be placed on the first crimp member forcing the first gripping edge (30) of the crimp member (22) to grip the jacket (100) of the fiber optic cable.
  • both the first and the second crimp members (22,23) are crimped as previously described. After the crimp has been actuated, the deformation of the crimp members (22,23) is maintained rendering the crimp permanent . The crimp is not disengageable from the jacket (100) of the fiber optic cable, even though the securing housing (10) is disengageable from the intermediate housing (1) . During the assembly operation, the securing housing (10) , is partially disengaged so that the threads are backed off from the intermediate housing (1) , although not completely. The tool used to crimp the second crimp member (23), which in a preferred embodiment is identical to the securing housing (10) , is completely removed from the intermediate housing (1) . As one of ordinary skill in the art can appreciate, partial disengagement of the securing housing and removal of the tool causes opposing force transmitting elements (16) , to disengage the first and second crimp member (22,23) .
  • both force transmitting elements (16) act to place opposing forces on the first and second crimp members (22,23) respectively, the result is a slight compression of the fiber optic cable jacket (100) between the first gripping edges (30) of first and second crimp members (22,23) respectively.
  • the physical stops (24,25) of the crimp members (22,23) limit the longitudinal movement of the intermediate housing (l) along the fiber optic cable but do not interfere with rotation of the intermediate housing (1) relative to the cable.
  • the attachment section (19) of the mating housing (17) is threaded over the coupling end (28) of the intermediate housing (1) .
  • the inner geometry of the attachment section (19) of the mating housing (17) differs from the inner geometry of the complementary engaging end (11) of the securing housing (10) in that the mating housing (17) does not include a force transmitting element (16) .
  • a few drops of epoxy are deposited on the threads (6) of the coupling end (28) of the intermediate housing (1) prior to connection with the mating housing (17) .
  • the epoxy on the threads (6) permanently attaches the intermediate housing (1) to the mating housing (17) .
  • Further assembly of the fiber optic cable according to the teachings of the present invention includes attachment of a fiber optic breakout fitting such as the one described in U.S. Patent Application Serial Number (Unknown) which is referred to as The Whitaker Corporation Docket Number 16744 the contents of which are specifically incorporated by reference herein.
  • the breakout fitting as described in the co-pending patent application is a preferred breakout fitting, alternative embodiments however, are acceptable.
  • four o-rings (32) are positioned in o-ring seats (20,15,7).
  • each o-ring is compressed at a joint between interconnecting elements of the fiber optic connector according to the teachings of the present invention. Sufficient compression of each of these o-rings at the various interconnection points is a sufficient environmental seal to prevent moisture engress into the enclosure to which the fiber optic connector is attached.
  • the appropriate coupling of the fiber optic connector to an enclosure comprises the following steps: as the intermediate housing (1) /mating housing (17) is free to rotate about the fiber optic cable, threadable attachment can be made between the coupling section (18) of the mating housing (17) and an enclosure (105) to which it is to be connected. As the mating housing (17) is coupled to the enclosure (105) , the securing housing (10) remains either partially or fully disengaged from the intermediate housing (1) . If the securing housing (10) is partially engaged with the intermediate housing (1) , it is also capable of freely rotating about the fiber optic cable in concert with the intermediate housing (1) . When the mating housing (17) is fully coupled to the enclosure, the securing housing (10) is then threaded onto the securing end (29) of the intermediate housing (1) .
  • the force transmitting elements (16) engage the first crimp member (22) and press it forward.
  • the slight axial movement of the first crimp member (22) in response to the force applied by the securing housing (10) slightly compresses the cable jacket (100) between the first and second crimp members (22,23).
  • the slight compression of the cable jacket (100) results in a positive physical and in the case of an armored fiber optic cable conductive contact between the intermediate housing (1) , the strip of armor (104) and the outer perimeter of the jacket (100) .
  • Further tightening of the securing housing (10) to its maximum engagement with the intermediate housing (1) provides for sufficient clamping of the connector onto the jacket (100) to sufficiently resist rotation of the fiber optic cable relative to the connector.
  • the completed assembly results in connection between a fiber optic cable and an enclosure having high tensile and compressive strength.
  • the connection is resistant to rotation between the cable and the connector, and in the case of an armored cable, provides a high quality ground from the armor of the fiber optic cable through the connector and to the enclosure.
  • the fiber optic connector according to the teachings of the present invention also provides a reliably terminated and coupled fiber optic cable assembly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

Un connecteur de fibres optiques permettant de terminer un câble à fibres optiques comprend un élément boîtier intermédiaire qui présente des extrémités d'engagement opposées pouvant tourner autour du câble optique. Un premier élément serti, présentant une première butée physique, et un second élément serti, présentant une seconde butée physique, sont disposés adjacents aux extrémités opposées de l'élément intermédiaire. La première et la seconde butée physique limitent le déplacement de l'élément intermédiaire le long du câble quand le premier et le second élément serti sont actionnés par engagement avec les extrémités. Le connecteur comprend également un élément boîtier d'appariement pouvant s'engager avec l'élément intermédiaire, et un élément boîtier de fixation pouvant s'engager avec ledit élément intermédiaire. Selon un procédé permettant de terminer un câble optique, on dénude une gaine d'un câble de façon à découvrir les éléments de résistance, un tube interne et des fibres individuelles; on positionne un élément de fixation, un premier élément serti, un élément intermédiaire, un second élément serti et un outil de sertissage par-dessus la gaine du câble; on actionne le premier et le second élément serti en enfilant l'élément de fixation et l'outil sur l'élément intermédiaire; on désengage partiellement l'élément de fixation de l'élément intermédiaire; on enlève l'outil et on enfile un élément d'appariement sur l'élément intermédiaire.
PCT/US1997/018747 1996-10-18 1997-10-16 Connecteur de fibres optiques resistant a la compression et a la traction pour couplage avec une enveloppe WO1998018035A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49068/97A AU4906897A (en) 1996-10-18 1997-10-16 Push and pull resistant fiber optic connector for coupling to an enclosure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73340496A 1996-10-18 1996-10-18
US08/733,404 1996-10-18

Publications (1)

Publication Number Publication Date
WO1998018035A1 true WO1998018035A1 (fr) 1998-04-30

Family

ID=24947460

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/018747 WO1998018035A1 (fr) 1996-10-18 1997-10-16 Connecteur de fibres optiques resistant a la compression et a la traction pour couplage avec une enveloppe

Country Status (2)

Country Link
AU (1) AU4906897A (fr)
WO (1) WO1998018035A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003058314A1 (fr) * 2001-12-27 2003-07-17 Three E Laboratories, Inc. Connecteurs hermetiquement etanches et traversees pour cables de fibre optique, et procede de fabrication de joints hermetiques pour de tels cables

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993005417A1 (fr) * 1991-09-12 1993-03-18 Augat Communications Group Inc. Connecteur d'admission de cables de fibres optiques
EP0555579A1 (fr) * 1992-02-14 1993-08-18 John Mezzalingua Assoc. Inc. Connecteur d'extrémité d'un câble optique
US5371821A (en) * 1991-06-12 1994-12-06 John Mezzalingua Assoc. Inc. Fiber optic cable end connector having a sealing grommet

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5371821A (en) * 1991-06-12 1994-12-06 John Mezzalingua Assoc. Inc. Fiber optic cable end connector having a sealing grommet
WO1993005417A1 (fr) * 1991-09-12 1993-03-18 Augat Communications Group Inc. Connecteur d'admission de cables de fibres optiques
EP0555579A1 (fr) * 1992-02-14 1993-08-18 John Mezzalingua Assoc. Inc. Connecteur d'extrémité d'un câble optique

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003058314A1 (fr) * 2001-12-27 2003-07-17 Three E Laboratories, Inc. Connecteurs hermetiquement etanches et traversees pour cables de fibre optique, et procede de fabrication de joints hermetiques pour de tels cables

Also Published As

Publication number Publication date
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